Light adjusting method, driving module and display device of display panel

Abstract

The application discloses a light adjusting method of a display panel, a driving module and a display device. The display panel comprises a first brightness node; the light adjusting method comprises the following steps: the light emitting control signal under the first brightness node comprises N first pulse groups in a frame, N is an integer greater than or equal to 1; the first pulse group comprises one first pulse and M second pulses after the first pulse, M is an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, the off level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, Δt1 is greater than zero; T1-Δt1 is greater than zero; the brightness level of the display panel is greater than the brightness level of the first brightness node, and the off level width of the first pulse of the light emitting control signal under the brightness node adjacent to the first brightness node in a frame is less than the off level width of the first pulse. The application can improve the display effect of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel light adjusting method, a driving module and a display device. BACKGROUND

[0002] With the development of display technology, the application of display panel is more and more extensive, and the requirement of display panel is higher and higher.

[0003] However, the display panel in the related art has the phenomenon of poor display. SUMMARY

[0004] The present application provides a display panel light adjusting method, a driving module and a display device to improve the display effect of the display panel.

[0005] According to an aspect of the present application, a display panel light adjusting method is provided, the display panel comprising a first brightness node; the light adjusting method comprising:

[0006] The light emitting control signal under the first brightness node comprises N first pulse groups in a frame, N being an integer greater than or equal to 1; the first pulse group comprises 1 first pulse and M second pulses after the first pulse, M being an integer greater than or equal to 1; the extinguishing level width of the first pulse is T1-Δt1, and the extinguishing level width of the second pulse is T1+Δt1 / M; T1 is greater than zero, and Δt1 is greater than zero; T1-Δt1 is greater than zero;

[0007] The brightness level of the display panel is greater than the brightness level of the first brightness node, and the extinguishing level width of the first pulse of the light emitting control signal under the brightness node adjacent to the first brightness node in a frame is less than the extinguishing level width of the first pulse.

[0008] Optionally, the display panel comprises a plurality of second brightness nodes, the brightness level of the second brightness node being greater than the brightness level of the first brightness node;

[0009] The extinguishing level width of the first pulse of the light emitting control signal under the second brightness node adjacent to the first brightness node in a frame is less than the extinguishing level width of the first pulse;

[0010] Optionally, the extinguishing level width of the first pulse of the light emitting control signal under the plurality of second brightness nodes in a frame increases with the decrease of the brightness level;

[0011] Optionally, the light-on level width of the first pulse of the light emitting control signal under the plurality of second brightness nodes in a frame decreases with the decrease of the brightness level.

[0012] Optionally, the absolute value of the ratio of the difference between the off-level width of the first pulse of the light emitting control signal under the k+1th second brightness node and the off-level width of the first pulse of the light emitting control signal under the kth second brightness node and the difference between the brightness level of the kth second brightness node and the k+1th second brightness node is different from the absolute value of the ratio of the difference between the off-level width of the first pulse of the light emitting control signal under the kth second brightness node and the off-level width of the first pulse of the light emitting control signal under the k-1th second brightness node and the difference between the brightness level of the k-1th second brightness node and the kth second brightness node; wherein the brightness level of the kth second brightness node is greater than the brightness level of the k+1th second brightness node; k is an integer greater than or equal to 2;

[0013] And / or, the absolute value of the ratio of the difference between the off-level width of the first pulse of the light emitting control signal under the k+1th second brightness node and the off-level width of the first pulse of the light emitting control signal under the kth second brightness node and the difference between the brightness level of the kth second brightness node and the k+1th second brightness node is greater than or equal to the absolute value of the ratio of the difference between the off-level width of the first pulse of the light emitting control signal under the kth second brightness node and the off-level width of the first pulse of the light emitting control signal under the k-1th second brightness node and the difference between the brightness level of the k-1th second brightness node and the kth second brightness node.

[0014] Optionally, the light emitting control signal under the second brightness node includes N second pulse groups in a frame; the second pulse group includes a third pulse and M fourth pulses after the third pulse; the off-level width of the third pulse in different second pulse groups in a frame is the same.

[0015] Optionally, the off-level width of the fourth pulse in the same second pulse group in a frame is the same,

[0016] Preferably, the off-level width of the fourth pulse in different second pulse groups in a frame is the same; the off-level width of the third pulse in the same second pulse group in a frame under the light emitting control signal under the kth second brightness node is T2 k -T2 k , the off-level width of the fourth pulse is T2 k +T2 k / M; T2 k is a second set value, Δt2 k is a second adjustment value, T2 k is greater than zero, Δt2 k is greater than zero; T2 k -T2 k is greater than zero;

[0017] T2 k a ratio of a sum of off-level widths of the third pulse and the M fourth pulses in the same second pulse group of the light-emitting control signal under the kth second luminance node divided by a pulse number of the second pulse group;

[0018] Alternatively, off-level widths of at least two fourth pulses in the same second pulse group within a frame are different;

[0019] Optionally, the off-level width of the third pulse in the same second pulse group within a frame of the light-emitting control signal under the kth second luminance node is T2 k -Δt2 k , and a total off-level width of the M fourth pulses is M*T2 k +Δt2 k -Δt3 k , T2 k is a second set value, Δt2 k is a second adjustment value, Δt3 k is a third adjustment value, T2 k is greater than zero, Δt2 k is greater than zero, Δt3 k is greater than zero; T2 k -Δt2 k is greater than zero.

[0020] Optionally, the off-level width of the fourth pulse in the same second pulse group within a frame is different from the off-level width of at least one third pulse;

[0021] Optionally, N*(M+1)*T2 corresponding to the plurality of second luminance nodes increases with a decrease of luminance levels of the second luminance nodes;

[0022] Optionally, N*(M+1)*T2 corresponding to the plurality of second luminance nodes linearly increases with a decrease of luminance levels of the second luminance nodes;

[0023] Optionally, a difference between N*(M+1)*T2 corresponding to the k+1th second luminance node and N*(M+1)*T2 corresponding to the kth second luminance node is equal to an absolute value of a ratio of a difference between luminance levels of the kth second luminance node and the k+1th second luminance node; k+1 and N*(M+1)*T2 corresponding to the k-1th second luminance node; k is equal to an absolute value of a ratio of a difference between luminance levels of the k-1th second luminance node and the kth second luminance node. k k-1

[0024] ​​Optionally, in the same second pulse group corresponding to the k-th second brightness node, the extinguishing level width of one of the M fourth pulses is T2. k +Δt2 k / M-Δt3 k The extinguishing level width of the other fourth pulse is T2. k +Δt2 k / M;

[0025] Optional, M is an integer greater than or equal to 2;

[0026] Optional, M equals 3;

[0027] And / or, the Δt3 corresponding to the kth second brightness node k Δt3 is greater than or equal to the Δt3 corresponding to the (k+1)th second brightness node. k+1 ;

[0028] And / or, in the same second pulse group corresponding to the kth second brightness node, the extinguishing level width of v fourth pulses out of M fourth pulses is T2. k +Δt2 k / M-Δt3 k / v, where v is an integer greater than or equal to 1, and v is less than or equal to M;

[0029] Optional, v is an integer greater than or equal to 2.

[0030] And / or, in the same second pulse group corresponding to the kth second brightness node, the extinguishing level width of at least one fourth pulse is T2. k +Δt2 k / M.

[0031] Optionally, the display panel includes a plurality of third brightness nodes, and at least one third brightness node is disposed between two adjacent second brightness nodes;

[0032] The light emission control signal under the third brightness node includes N third pulse groups in one frame; the third pulse group includes the fifth pulse and M sixth pulses located after the fifth pulse; N is an integer greater than or equal to 2; the extinguishing level width of the fifth pulse in different third pulse groups in one frame is the same;

[0033] The luminance control signal located under the third luminance node between the kth second luminance node and the (k+1)th second luminance node has the same extinguishing level width of the fifth pulse in a frame as the extinguishing level width of the third pulse of the luminance control signal of the kth second luminance node in a frame; wherein, the luminance level of the kth second luminance node is greater than the luminance level of the (k+1)th second luminance node.

[0034] Optionally, the display panel comprises a plurality of third luminance nodes, and the plurality of third luminance nodes are arranged between any two adjacent second luminance nodes.

[0035] The light-emitting control signal under the third luminance node comprises N third pulse groups in a frame; each third pulse group comprises a fifth pulse and M sixth pulses after the fifth pulse; N is an integer greater than or equal to 2; the off level width of the fifth pulse in different third pulse groups in a frame is the same.

[0036] The total width of the off level of all the sixth pulses in the N third pulse groups in a frame is N*(M*T2 k +Δt2 k )+i*ΔH–N*Δt3 k(i) , where Δt3 k(i) is greater than or equal to 0 and less than Δt3 k , Δt3 k(i) decreases with the increase of i, or Δt3 k(i) decreases first and then remains unchanged with the increase of i, and ΔH is a fourth adjustment value, ΔH being greater than 0; wherein the luminance level of the kth second luminance node is greater than the luminance level of the k+1th second luminance node; i is an integer greater than or equal to 1.

[0037] Optionally, ΔH is a fixed constant.

[0038] Optionally, Δt3 k(i) decreases first and then becomes 0 with the increase of i.

[0039] Optionally, for one or more third luminance nodes located between the kth second luminance node and the k+1th second luminance node and adjacent to the k+1th second luminance node, the corresponding Δt3 k(i) is equal to 0.

[0040] Optionally, for at least part of the third luminance nodes, the off level width of the sixth pulse corresponding to N pairs or v*N+1 pairs of positions of the light-emitting control signals of two adjacent third luminance nodes in a frame is different; v is an integer greater than or equal to 1 and less than or equal to M.

[0041] And / or, for the first third luminance node among the plurality of third luminance nodes located between the kth second luminance node and the k+1th second luminance node, the off level width of the first sixth pulse in the first third pulse group of the light-emitting control signal in a frame is greater than the off level width of the first fourth pulse of the light-emitting control signal under the kth second luminance node.

[0042] and / or, when i is greater than or equal to 2 and less than or equal to N, the off-level width of the light emitting control signal under the i-th third luminance node at the first sixth pulse of the i-th third pulse group in a frame is greater than the off-level width of the light emitting control signal under the (i-1)-th third luminance node at the first sixth pulse of the i-th third pulse group in a frame;

[0043] and / or, when i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the off-level width of the light emitting control signal under the i-th third luminance node at the w-th sixth pulse of the i-(w-1)*N-th third pulse group in a frame is greater than the off-level width of the light emitting control signal under the (i-1)-th third luminance node at the w-th sixth pulse of the i-(w-1)*N-th third pulse group in a frame; w is greater than or equal to 2 and less than or equal to M;

[0044] Optionally, among the third luminance nodes between the k-th second luminance node and the (k+1)-th second luminance node, the off-level width of the light emitting control signal under the 1-st third luminance node at the first sixth pulse of the 1-st third pulse group in a frame is greater than the off-level width of the first fourth pulse of the light emitting control signal under the k-th second luminance node by ΔH, or the difference between the off-level width of the light emitting control signal under the 1-st third luminance node at the first sixth pulse of the 1-st third pulse group in a frame and the off-level width of the first fourth pulse of the light emitting control signal under the k-th second luminance node is greater than or equal to ΔH-Δt3 k(1) ,

[0045] and / or, when i is greater than or equal to 2 and less than or equal to N, the off-level width of the light emitting control signal under the i-th third luminance node at the first sixth pulse of the i-th third pulse group in a frame is greater than the off-level width of the light emitting control signal under the (i-1)-th third luminance node at the first sixth pulse of the i-th third pulse group in a frame by ΔH, or the difference between the off-level width of the light emitting control signal under the i-th third luminance node at the first sixth pulse of the i-th third pulse group in a frame and the off-level width of the light emitting control signal under the (i-1)-th third luminance node at the first sixth pulse of the i-th third pulse group in a frame is greater than or equal to ΔH+(Δt3 k(i-1) -Δt3 k(i) );

[0046] And / or, when i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the off level width of the light emitting control signal under the ith third luminance node at the wth sixth pulse of the i-(w-1)*Nth third pulse group in a frame is greater than the off level width of the light emitting control signal under the (i-1)th third luminance node at the wth sixth pulse of the i-(w-1)*Nth third pulse group in a frame by a ΔH, or the difference between the off level width of the light emitting control signal under the ith third luminance node at the wth sixth pulse of the i-(w-1)*Nth third pulse group in a frame and the off level width of the light emitting control signal under the (i-1)th third luminance node at the wth sixth pulse of the i-(w-1)*Nth third pulse group in a frame is greater than or equal to ΔH+(Δt3 k(i-1) -Δt3 k(i) ); w is greater than or equal to 2 and less than or equal to M.

[0047] Optionally, the display panel further comprises a plurality of fourth luminance nodes, the luminance level of the fourth luminance nodes is greater than the luminance level of the second luminance nodes.

[0048] The light emitting control signal under the fourth luminance node comprises N fourth pulse groups in a frame time; the fourth pulse group comprises M+1 seventh pulses.

[0049] Optionally, the total off level width of the light emitting control signals under the plurality of fourth luminance nodes in a frame increases with the decrease of the luminance level of the fourth luminance nodes.

[0050] Optionally, the total off level width of the light emitting control signals under the plurality of fourth luminance nodes in a frame linearly increases with the decrease of the luminance level of the fourth luminance nodes.

[0051] Optionally, the absolute value of the ratio of the difference between the off level width of the light emitting control signal under the (p+1)th fourth luminance node in a frame and the off level width of the light emitting control signal under the pth fourth luminance node in a frame and the difference between the luminance level of the pth fourth luminance node and the luminance level of the (p+1)th fourth luminance node is equal to the absolute value of the ratio of the difference between the off level width of the light emitting control signal under the pth fourth luminance node in a frame and the off level width of the light emitting control signal under the (p-1)th fourth luminance node in a frame and the difference between the luminance level of the (p-1)th fourth luminance node and the luminance level of the pth fourth luminance node; wherein the luminance level of the pth fourth luminance node is greater than the luminance level of the (p+1)th fourth luminance node; p is an integer greater than or equal to 2.

[0052] Optionally, in the same fourth pulse group, the off level width of the first seventh pulse is greater than or equal to the off level width of the remaining seventh pulses.

[0053] Optionally, the display panel comprises a plurality of fifth luminance nodes, and the plurality of fifth luminance nodes are arranged between the two adjacent fourth luminance nodes.

[0054] The total width of the off level of the light-emitting control signal under the plurality of fifth luminance nodes between the two adjacent fourth luminance nodes in a frame increases with the decrease of the luminance level of the fifth luminance node.

[0055] Optionally, the total width of the off level of the light-emitting control signal under the plurality of fifth luminance nodes between the two adjacent fourth luminance nodes in a frame linearly increases with the decrease of the luminance level of the fifth luminance node.

[0056] Optionally, in the plurality of fifth luminance nodes between the two adjacent fourth luminance nodes, the absolute value of the ratio of the difference between the off level width of the light-emitting control signal under the j+1th fifth luminance node and the off level width of the light-emitting control signal under the jth fifth luminance node and the difference between the luminance level of the jth fifth luminance node and the luminance level of the j+1th fifth luminance node is equal to the absolute value of the ratio of the difference between the off level width of the light-emitting control signal under the jth fifth luminance node and the off level width of the light-emitting control signal under the j-1th fifth luminance node and the difference between the luminance level of the j-1th fifth luminance node and the luminance level of the jth fifth luminance node; wherein the luminance level of the jth fifth luminance node is greater than the luminance level of the j+1th fifth luminance node; j is an integer greater than or equal to 2.

[0057] Optionally, the light-emitting control signal under the fifth luminance node comprises N fifth pulse groups in a frame time; the fifth pulse group comprises M+1 eighth pulses, and the off level width of the eighth pulse corresponding to only one pair of positions in a frame is different between the light-emitting control signals of the adjacent two fifth luminance nodes.

[0058] In the plurality of fifth luminance nodes between the two adjacent fourth luminance nodes, when j is greater than or equal to 1 and less than or equal to N, the off level width of the first eighth pulse of the first jth fifth pulse group of the light-emitting control signal under the jth fifth luminance node is greater than the off level width of the seventh pulse of the light-emitting control signal under the fourth luminance node with a greater luminance level in the adjacent two fourth luminance nodes by a fifth adjustment value; when j is greater than or equal to (q-1)*N+1 and less than or equal to q*N, the off level width of the first q-1th eighth pulse of the Nth fifth pulse group and the qth eighth pulse of the first j-(q-1)*Nth fifth pulse group of the light-emitting control signal under the jth fifth luminance node is greater than the off level width of the seventh pulse of the light-emitting control signal under the fourth luminance node with a greater luminance level in the adjacent two fourth luminance nodes by a fifth adjustment value; q is greater than or equal to 2 and less than or equal to M; and the fifth adjustment value is greater than 0.

[0059] Optionally, the fifth adjustment value is a fixed constant greater than 0.

[0060] Optionally, the jth fifth luminance node between two adjacent fourth luminance nodes and the (j-1)th fifth luminance node correspond to different off-level widths of the bth eighth pulse in the ath eighth pulse group in the corresponding light-emitting control signal in a frame; when j is not an integer multiple of N, a is the remainder of j / N, and b is the quotient of (j+N) / N; when j is an integer multiple of N, a is N, and b is j / N, j is greater than or equal to 2.

[0061] Optionally, the first luminance node is multiple, and the luminance levels of the multiple first luminance nodes decrease in turn, and the light-emitting control signals under the multiple first luminance nodes are the same.

[0062] Alternatively, the display panel comprises at least one sixth luminance node,

[0063] The luminance level of the sixth luminance node is less than the luminance level of the first luminance node, and the light-emitting control signal under the sixth luminance node is the same as the light-emitting control signal under the first luminance node.

[0064] Optionally, N is an integer greater than or equal to 2.

[0065] And / or, M is an integer greater than or equal to 2.

[0066] And / or, under the same gray scale or the maximum gray scale, the greater the luminance level of the luminance node, the greater the corresponding luminance.

[0067] And / or, the display panel comprises a pixel circuit, and a data writing stage of the pixel circuit overlaps with a period of an off-level of a first pulse of the light-emitting control signal accessed by the pixel circuit in a frame.

[0068] And / or, T1 is a ratio of a sum of off-level widths of the first pulse and the M second pulses in the same first pulse group divided by a pulse number of the first pulse group.

[0069] According to another aspect of the present application, a display panel light adjustment method is provided, the display panel comprising a first luminance node and a plurality of second luminance nodes, the luminance level of the second luminance node being greater than the luminance level of the first luminance node; the light adjustment method comprising:

[0070] receiving a light-emitting control signal, the light-emitting control signal under the first luminance node comprising N first pulse groups in a frame, N being an integer greater than or equal to 1; the first pulse group comprising 1 first pulse and M second pulses after the first pulse, M being an integer greater than or equal to 1; the off-level width of the first pulse being less than the off-level width of the second pulse;

[0071] the off-level width of the first pulse of the light-emitting control signal under the second luminance node adjacent to the first luminance node is less than the off-level width of the first pulse;

[0072] the off-level width of the first pulse of the light-emitting control signal under the second luminance node increases with the decrease of the luminance level.

[0073] Optionally, the off-level width of the first pulse of the light-emitting control signal under the second luminance node increases non-linearly with the decrease of the luminance level.

[0074] and / or, the absolute value of the ratio of the difference between the off-level width of the first pulse of the light-emitting control signal under the k+1th second luminance node and the off-level width of the first pulse of the light-emitting control signal under the kth second luminance node to the difference between the luminance levels of the kth second luminance node and the k+1th second luminance node is different from the absolute value of the ratio of the difference between the off-level width of the first pulse of the light-emitting control signal under the kth second luminance node and the off-level width of the first pulse of the light-emitting control signal under the k-1th second luminance node to the difference between the luminance levels of the k-1th second luminance node and the kth second luminance node; wherein the luminance level of the kth second luminance node is greater than the luminance level of the k+1th second luminance node; k is an integer greater than or equal to 2;

[0075] and / or, the absolute value of the ratio of the difference between the off-level width of the first pulse of the light-emitting control signal under the k+1th second luminance node and the off-level width of the first pulse of the light-emitting control signal under the kth second luminance node to the difference between the luminance levels of the kth second luminance node and the k+1th second luminance node is greater than or equal to the absolute value of the ratio of the difference between the off-level width of the first pulse of the light-emitting control signal under the kth second luminance node and the off-level width of the first pulse of the light-emitting control signal under the k-1th second luminance node to the difference between the luminance levels of the k-1th second luminance node and the kth second luminance node.

[0076] Optionally, the off-level width of the first pulse is T1-Δt1, and the off-level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, and Δt1 is greater than zero; T1-Δt1 is greater than zero, and T1 is the ratio of the sum of the off-level widths of the first pulse and the M second pulses in the same first pulse group to the number of pulses in the first pulse group;

[0077] Optionally, M is an integer greater than or equal to 2;

[0078] Optionally, M is equal to 3;

[0079] Optionally, the luminance level of the display panel is greater than the luminance level of the light-emitting control signal under the first luminance node, and the number of pulses in a frame of the light-emitting control signal under the first luminance node is the same as the number of pulses in a frame of the light-emitting control signal under the first luminance node.

[0080] The luminance level of the display panel is greater than the luminance level of the light-emitting control signal under the first luminance node, and the luminance level of the display panel is adjacent to the first luminance node.

[0081] Optionally, the difference between the off-level width of the first pulse in a frame of the light-emitting control signal under the k+1th second luminance node and the off-level width of the first pulse in a frame of the light-emitting control signal under the kth second luminance node is greater than or equal to the ratio of the difference between the luminance levels of the kth second luminance node and the k+1th second luminance node to the ratio of the difference between the off-level width of the first pulse in a frame of the light-emitting control signal under the kth second luminance node and the off-level width of the first pulse in a frame of the light-emitting control signal under the k-1th second luminance node to the difference between the luminance levels of the k-1th second luminance node and the kth second luminance node; wherein the luminance level of the kth luminance node is greater than the luminance level of the k+1th second luminance node.

[0082] Optionally, the light-emitting control signal under the second luminance node includes N second pulse groups in a frame; a second pulse group includes a third pulse and M fourth pulses after the third pulse; the off-level width of the third pulse in different second pulse groups in a frame is the same.

[0083] Optionally, the off-level width of the third pulse in the same second pulse group is less than the off-level width of the fourth pulse.

[0084] Optionally, in a frame of the light-emitting control signal under the kth second luminance node, the off-level width of the third pulse in the same second pulse group is T2 k -Δt2 k , the total off-level width of the M fourth pulses is M*T2 k +Δt2 k -Δt3 k , T2 k is greater than zero, Δt2 k is greater than zero, and Δt3 k is greater than zero.

[0085] Optionally, N*(M+1)*T2 corresponding to the plurality of second luminance nodes increases linearly with the decrease of the luminance level of the second luminance node.

[0086] Optionally, in the same second pulse group corresponding to the kth second luminance node, the off-level width of one of the M fourth pulses is T2k + Δt2 k / M - Δt3 k the off level width of the other fourth pulse is T2 k + Δt2 k / M.

[0087] According to another aspect of the present application, there is provided a driving module for outputting a light emitting control signal,

[0088] wherein the light emitting control signal at the first luminance node comprises N first pulse groups in a frame, N being an integer greater than or equal to 1; each first pulse group comprises one first pulse and M second pulses after the first pulse, M being an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, Δt1 is greater than zero; T1-Δt1 is greater than zero;

[0089] the off level width of the first pulse of the light emitting control signal at the luminance node adjacent to the first luminance node is less than the off level width of the first pulse.

[0090] According to another aspect of the present application, there is provided a display device comprising a display panel and a driving module for outputting a light emitting control signal to the display panel,

[0091] wherein the light emitting control signal at the first luminance node comprises N first pulse groups in a frame, N being an integer greater than or equal to 1; each first pulse group comprises one first pulse and M second pulses after the first pulse, M being an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, Δt1 is greater than zero; T1-Δt1 is greater than zero; the off level width of the first pulse of the light emitting control signal at the luminance node adjacent to the first luminance node is less than the off level width of the first pulse.

[0092] The technical scheme of the embodiment of the present application adopts the display panel light adjusting method, wherein the display panel comprises a first brightness node; the light emitting control signal under the first brightness node comprises N first pulse groups in a frame, N is an integer greater than or equal to 1; the first pulse group comprises one first pulse and M second pulses after the first pulse; the light emitting control signal under the brightness node adjacent to the first brightness node and having a brightness level greater than the first brightness node has a first pulse with a turn-off level width smaller than that of the first pulse. The light emitting control signal under the brightness node with a brightness level greater than the first brightness node is configured to have a turn-off level width smaller than that of the first pulse in a frame, so that the turn-off level width of the first pulse of the light emitting control signal shows a one-way increasing trend with the decrease of the brightness level, and the sudden brightness decrease in the process of increasing the brightness level does not occur, thereby avoiding the brightness inversion problem.

[0093] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0094] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0095] Figure 1 A timing diagram of a display panel light adjusting method in the related art;

[0096] Figure 2 A timing diagram of another display panel light adjusting method in the related art;

[0097] Figure 3 A structural schematic diagram of a display panel provided by the embodiment of the present application;

[0098] Figure 4 A structural schematic diagram of a pixel circuit provided by the embodiment of the present application;

[0099] Figure 5 A timing diagram of a display panel light adjusting method provided by the embodiment of the present application; Figure 4

[0100] A timing diagram of a display panel light adjusting method provided by the embodiment of the present application; Figure 6

[0101] A timing diagram of a display panel light adjusting method provided by the embodiment of the present application; Figure 7 Figure 6 ​a local enlarged view of the first pulse of the second brightness node;

[0102] Figure 8 a second brightness node of an embodiment of the present application provides a first pulse of the second brightness node of the present application extinguishing level width variation trend schematic diagram;

[0103] Figure 9 a second brightness node of an embodiment of the present application provides a second display panel dimming method timing diagram;

[0104] Figure 10 a second brightness node of an embodiment of the present application provides a second display panel dimming method timing diagram;

[0105] Figure 11 a second brightness node of an embodiment of the present application provides a second display panel dimming method timing diagram;

[0106] Figure 12 a second brightness node of an embodiment of the present application provides a second display panel dimming method timing diagram;

[0107] Figure 13 a second brightness node of an embodiment of the present application provides a second display panel dimming method timing diagram;

[0108] Figure 14 a second brightness node of an embodiment of the present application provides a second display panel dimming method timing diagram. DETAILED DESCRIPTION

[0109] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0110] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0111] In the related art, the display panel is prone to brightness reversal when the brightness changes. The inventor finds that the cause of the technical problem is that the brightness of the display panel is changed by changing the total duty cycle of the off level of the light emitting control signal in a frame time in the related art. The total duty cycle (or total pulse width) of the off level of the light emitting control signal is linearly increased, and as the brightness level decreases, the off level width of the first pulse of the light emitting control signal in a frame is also linearly increased, so the stroboscopic effect visibility measure (SVM) index is poor. If the SVM solution is combined on the basis of the linear increase of the total duty cycle of the off level of the light emitting control signal in a frame time, such as Figure 1 , Figure 1 is a timing diagram of a dimming method of a display panel in the related art. The timing of each brightness node is the timing of the light emitting control signal. The brightness levels of the brightness nodes DBV(1) to DBV(6) decrease in turn, and the brightness level of the first brightness node DBV1 is lower than the brightness level of the brightness node DBV(6). Each brightness node includes a plurality of pulse groups P, and each pulse group P includes a plurality of pulses. Without considering the SVM improvement scheme, the falling edge of each off level pulse under the first brightness node DBV1 should be shown by the dashed line, which is similar to the light emitting control signal under each other brightness node, that is, the off level pulse width of each pulse is equal, and as the brightness level decreases, the off level pulse width increases. For example, the off level is a high level. After considering the SVM scheme, the falling edge of each off level pulse under the first brightness node DBV1 is shown by the solid line. In other words, the SVM improvement scheme fixes the pulse width of the first off level pulse in the light emitting control signal corresponding to some brightness nodes, although it can improve the SVM index, but the high level width of the first off level pulse under each brightness node is reversed, that is, in the decreasing trend, there is a special case of decreasing, which causes the brightness reversal of the display panel when the brightness level of the display panel changes. That is, when dragging the brightness bar, the brightness should decrease, but some nodes will appear brightness increase.

[0112] To solve the above technical problems, the present application provides the following solutions:

[0113] First, a structure of a display panel is introduced. Those skilled in the art should understand that the exemplary introduction of the display panel in the embodiment does not represent a limitation of the display panel, and the dimming method can also be applied to other types of display panels. As shown in Figures 3 to 5 , Figure 3 is a structure diagram of a display panel provided by the embodiment of the present application, Figure 4 is a structure diagram of a pixel circuit provided by the embodiment of the present application,Figure 5 for Figure 4 A timing diagram. The display panel includes a display area and a non-display area. The non-display area may surround at least part of the display area. Multiple crisscrossing gate lines and data lines (DL1-DLn) are arranged within the display area, and multiple pixel circuits 10 arranged in an array are also provided within the display area. Each data line connects to a corresponding column (e.g., one column) of pixel circuits, and each gate line connects to a corresponding row (e.g., one or more rows) of pixel circuits. Figure 3 As shown, Figure 3 The gate lines in the display panel include scan line groups (GL1-GLk) and light emission control signal lines (EM1-EMk), wherein each scan line group includes at least one scan line. The display panel may include a data driving circuit 20. The data driving circuit 20 is electrically connected to the data lines and provides data signals to the data lines. The display panel may include a scan driving circuit 30. The scan driving circuit 30 is electrically connected to the scan lines and provides scan signals to the scan lines. The display panel may include a light emission control signal generation circuit 40. The light emission control signal generation circuit 40 provides light emission control signals to the light emission control signal lines. The data driving circuit 20 may be located in a non-display area. The scan driving circuit 30 may be located in a non-display area. The light emission control signal generation circuit 40 may be located in a non-display area.

[0114] A subpixel may include pixel circuitry and a light-emitting element (PX). The pixel circuitry is connected to the light-emitting element (PX). For example... Figure 3As shown, the pixel circuit includes part or all of the driving transistor T1, the data writing transistor T2, the threshold compensation transistor T3, the first initialization transistor T4, the first light-emitting control transistor T5, the second light-emitting control transistor T6, the second initialization transistor T7, the third initialization transistor T8, and the storage capacitor Cst. The first end of the data writing transistor T2 is electrically connected with the corresponding data line DL, the second end of the data writing transistor T2 is electrically connected with the first end of the driving module T1, and the control end of the data writing transistor T2 is electrically connected with the first scan line SP1; the first end of the first light-emitting control transistor T5 is electrically connected with the first end of the driving transistor T1, the second end of the first light-emitting control transistor T5 is electrically connected with the first power signal line ELVDD, and the control end of the first light-emitting control transistor T5 is electrically connected with the corresponding light-emitting control signal line EM; the first end of the threshold compensation transistor T3 is electrically connected with the second end of the driving transistor T1, the second end of the threshold compensation transistor T3 is electrically connected with the control end of the driving transistor T1, and the control end of the threshold compensation transistor T3 is electrically connected with the second scan line SN2; the first end of the storage capacitor Cst is electrically connected with the first power signal line ELVDD, and the second end of the storage capacitor Cst is electrically connected with the control end of the driving transistor T1; the first end of the first initialization transistor T4 is electrically connected with the first initialization signal line Vrefn1, the second end of the first initialization transistor T4 is electrically connected with the first end of the threshold compensation transistor T3 or the control end of the driving transistor T1, and the control end of the first initialization transistor T4 is electrically connected with the third scan signal line SN1; the first end of the second light-emitting control transistor T6 is electrically connected with the second end of the driving transistor T1, the second end of the second light-emitting control transistor T6 is electrically connected with the first end of the light-emitting element PX, and the control end of the second light-emitting control transistor T6 is electrically connected with the corresponding light-emitting control signal line EM; the first end of the second initialization transistor T7 is electrically connected with the second initialization signal line Vrefn2, the second end of the second initialization transistor T7 is electrically connected with the first end of the light-emitting element PX, and the control end of the second initialization transistor T7 is electrically connected with the fourth scan signal line SP2; the first end of the third initialization transistor T8 is electrically connected with the third initialization signal line Vrefp, the second end of the third initialization transistor T8 is electrically connected with the second end of the driving transistor T1 or the first end of the driving transistor T1, and the control end of the third initialization transistor T8 is electrically connected with the fourth scan signal line SP2; and the second end of the light-emitting element PX is electrically connected with the second power signal line ELVSS. In the above-mentioned transistors, the threshold compensation transistor T3 and the first initialization transistor T4 can be oxide transistors, for example, indium gallium zinc oxide transistors, and the remaining transistors can be single-crystal silicon or polycrystalline silicon transistors. Such a pixel circuit can also be a pixel circuit of an LTPO (Low Temperature Polycrystalline Oxide) structure.The pixel circuit of the LTPO structure is more conducive to low-frequency display due to the low leakage current. The light emitting element PX can be an OLED (Organic Light Emitting Diode), a Micro LED (Micro Light Emitting Diode), or a Mini LED (mini Light Emitting Diode), etc. In addition, Figure 1 Each of the gate line groups includes a first scan signal line SP1, a second scan signal line SN2, a third scan signal line SN1, and a fourth scan signal line SP2.

[0115] As shown in FIG. 1, the working process of the pixel circuit includes an initialization phase t1, a data writing phase t2, and a light emitting phase t3. Figure 5

[0116] In the initialization phase t1, the signals on the second scan signal line SN2, the third scan signal line SN1, and the fourth scan signal line SP2 control the corresponding transistors to be turned on, the initialization signal on the first initialization signal line Vrefn1 resets the control terminal of the driving transistor T1, the initialization signal on the second initialization signal line Vrefn2 resets the first terminal of the light emitting element PX, and the initialization signal on the third initialization signal line Vrefp resets the second terminal or the first terminal of the driving transistor T1.

[0117] In the data writing phase t2, the signal on the first scan signal line SP1 controls the data writing transistor T2 to be turned on, and the signal on the second scan signal line SN2 controls the threshold compensation transistor T3 to be turned on; the data voltage on the data line DL is written to the control terminal of the driving transistor T1 after passing through the data writing transistor T2, the driving transistor T1, and the threshold compensation transistor T3, and the threshold voltage of the driving transistor T1 is compensated to the voltage obtained after the data voltage, and when the voltage difference between the control terminal and the second terminal of the driving transistor T1 is less than the threshold voltage of the driving transistor T1, the driving transistor T1 is turned off, so that the voltage of the control terminal of the driving transistor T1 and / or the voltage stored by the storage capacitor Cst contain the threshold voltage information of the driving transistor T1.

[0118] In the initialization phase t1 and the data writing phase t2, when the signal on the light emitting control signal line EM is at an extinguishing level (for example, the off level of the first light emitting control transistor T5 and the second light emitting control transistor T6, for example, a high level), the first light emitting control transistor T5 and the second light emitting control transistor T6 can be controlled to be turned off, and the light emitting element PX can be controlled not to emit light.

[0119] ​In the light emitting stage t3, the signal on the light emitting control signal line EM controls the first light emitting control transistor T5 and the second light emitting control transistor T6 to be turned on. The driving transistor T1 generates a driving current, and the light emitting element PX emits light in response to the driving current. In the light emitting stage t3, the threshold compensation transistor T3 and the first initialization transistor T4 have a small leakage current, so that the above-mentioned pixel circuit is more conducive to realize low-frequency display. When the signal on the light emitting control signal line EM is the lighting level (for example, the turn-on level of the first light emitting control transistor T5 and the second light emitting control transistor T6, for example, the low level), the first light emitting control transistor T5 and the second light emitting control transistor T6 can be controlled to be turned on, and the light emitting element PX can be controlled to emit light. The length of the extinguishing level in each pulse of the signal on the light emitting control signal line EM can be the extinguishing level width, and the length of the lighting level can be the lighting level width. For example, in each pulse, the extinguishing level period is before the lighting level period. In some embodiments, in each pulse, the extinguishing level period is after the lighting level period, which can be set as needed.

[0120] In addition, in the light emitting stage t3, the light emitting control signal is provided with multiple pulses, and in the pulse time, the light emitting element PX does not emit light, and the pulse of the light emitting control signal can also be called a black insertion pulse.

[0121] Figure 6 A timing diagram of a dimming method of a display panel provided by an embodiment of the present application, Figure 7 For Figure 6 The partial enlarged view of Figure 6 And Figure 7 Among them, Figure 6 Each timing in Figure 7 is Figure 6An enlarged view of the middle dashed box. The display panel comprises a first brightness node DBV1; the dimming method comprises: the light emission control signal under the first brightness node DBV1 comprises N first pulse groups P1 in a frame T (which can be each frame in one or more frames under a preset refresh frequency); N is an integer greater than or equal to 1; the first pulse group P1 comprises one first pulse P11 and M second pulses P12 located after the first pulse P11, M is an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse P12 is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, Δt1 is greater than zero; T1-Δt1 is greater than zero; the brightness level of the display panel is greater than the brightness level of the first brightness node DBV1, and the off level width of the first pulse of the light emission control signal under the brightness node adjacent to the first brightness node DBV1 in a frame T is less than the off level width of the first pulse P11. For example, the off level width of the pulses at corresponding positions in the N first pulse groups P1 under the first brightness node DBV1 can be the same, for example, the off level width of the first pulses in the N first pulse groups P1 can be the same, for example, the off level width of the second pulses in the N first pulse groups P1 can be the same, for example, the off level width of the multiple second pulses in the same first pulse group P1 can be the same. For example, the on level width of the pulses at corresponding positions in the N first pulse groups P1 under the first brightness node DBV1 can be the same. For example, in the same first pulse group P1, the off level width of the second pulse P12 is greater than the off level width of the first pulse by (1+1 / M)*Δt1.

[0122] Specifically, the display panel has a plurality of luminance nodes, and the higher the luminance level is, the higher the luminance of the display panel is under the same gray scale (for example, the maximum gray scale); the lower the corresponding luminance level is, the lower the luminance of the display panel is; before dimming, the display panel will first fix a plurality of luminance nodes, configure the luminous control signal corresponding to the luminance nodes, and then the driving chip will automatically calculate the luminous control signal corresponding to the luminance level between the luminance nodes. The luminance of the display panel can be adjusted in various ways, such as DC (Direct Current) dimming, AC (alternating current) dimming, and mixed dimming of DC and AC. Among them, DC dimming refers to adjusting the current of light emission by adjusting the size of the data signal, and then adjusting the luminance; AC dimming refers to keeping the size of the data signal unchanged, and adjusting the luminous control signal in one or more ways, such as the total duty cycle of the pulse, the number of pulses, the width of a single pulse, etc. to control the luminance of light emission. Generally, in the lower luminance level interval, the mixed dimming of AC dimming and DC dimming can be used; in the higher luminance level interval, the DC dimming method is used; in other luminance level intervals, the AC dimming method is used. The specific luminance level interval that needs to use the AC dimming method is known to those skilled in the art, and will not be described here. The display panel includes N pulse groups, each pulse group includes M+1 pulses, for example, N can be 3, M can be 3, that is, the luminous control signal includes 12 pulses in a frame T. Of course, N and M can also be other values, and the present embodiment does not specifically limit this. In a related AC dimming scheme, the luminance interval of AC dimming has only one dimming method, that is, first select some luminance nodes, configure the total width of the extinguishing level of the selected luminance nodes, and configure the extinguishing level width of each pulse to be equal. Then the luminous control signal between the adjacent two luminance nodes is determined by interpolation. Figure 2 is a timing diagram of another dimming method for a display panel in the related art. Specifically, as shown in Figure 1 and Figure 2 , taking the luminance node between the luminance node DBV(3) and the luminance node DBV(4) in Figure 1 as an example, and marked as DBV(3) i , wherein i is equal to 1, 2, 3, 4, 5, …. Figure 2The increase in pulse width of the extinguishing level compared to the previous brightness node of a higher brightness level is marked as EP. If the total pulse width difference of the extinguishing level of two adjacent brightness levels is ΔH, then the specific interpolation method is as follows: For a brightness level adjacent to brightness node DBV(3), such as brightness node (3)1, the extinguishing level width of the first pulse in its first pulse group P is increased by ΔH compared to the extinguishing level width of the first pulse in the first pulse group of brightness node DBV(3), and the other pulses are consistent with the pulses of brightness node DBV(3). For the light emission control signal under the brightness node of the next brightness level, such as brightness node (3)2, the first pulse in its second pulse group is increased by ΔH compared to brightness node (3)1, and the other pulses are consistent with the pulses of brightness node DBV(3)1, and so on. When the brightness node DBV(3) n The extinguishing level width of the first pulse in the Nth pulse group is increased by ΔH, which is equivalent to adding ΔH to the first pulse in all N first pulse groups, and then at the next brightness node DBV(3). n+1 Then, the extinguishing level width of the second pulse in the first pulse group is increased, that is, the extinguishing level width of the second pulse in the first pulse group of the brightness node DBV(3)4 is increased by ΔH compared with that of the brightness node DBV(3)3, and the other pulses are consistent with the pulses of the brightness node DBV(3)3. Then, the extinguishing level width of the second pulse in the second pulse group is increased again in the next brightness node, and so on. It should be noted that the extinguishing level of the light emission control signal is the level at which the light emission control module in the pixel circuit is turned off, so as to control the light emission element PX not to emit light. Each pulse of the light emission control signal includes an extinguishing level and a conducting level. The conducting level of the light emission control signal is the level at which the light emission control module in the pixel circuit is turned on, so as to control the light emission element PX to emit light. The periods of all pulses are equal. In this embodiment, the extinguishing level is high; of course, in some other embodiments, the extinguishing level can also be low. In related technologies, as the brightness level changes, the extinguishing level width of the first pulse of the light emission control signal within a frame time changes linearly; for example, as the brightness level decreases linearly, the extinguishing level width of the first pulse of the light emission control signal within a frame time will increase linearly.

[0123] If the extinguishing level width of each pulse of the emission control signal under the first brightness node DBV1 is equal within a frame (similar to...), Figure 1(The falling edge of each pulse under the first brightness improvement node should be the waveform shown by the dashed line). The SVM index obtained by the test is poor because the data writing stage of the pixel circuit overlaps with the time period of the extinguishing level of the first pulse of the light emission control signal in a frame, while the time period of the extinguishing level of the remaining pulses does not overlap with the data writing stage of the pixel circuit. Therefore, the working state of the pixel circuit corresponding to the first pulse and the remaining pulses of the light emission control signal in a frame is different, resulting in a large difference between the brightness change corresponding to the first pulse and the brightness change corresponding to the remaining pulses of the light emission control signal in a frame, which leads to a poor SVM index.

[0124] In this embodiment, Figure 6 The first luminance node DBV1 can be understood as an SVM improvement node. The total width of the extinguishing level of the emission control signal of the first luminance node DBV1 within one frame T is determined according to the luminance level of the first luminance node DBV1. That is to say, the total width of the extinguishing level of the emission control signal of the first luminance node DBV1 within one frame is fixed, regardless of whether it is set as an SVM improvement node. Its total pulse width is a fixed value, for example, fixed to TT. Then the value of T1 is TT / (M*N), in other words, TT=M*N*T1. When this luminance node is set as an SVM improvement node, the extinguishing level width of the first pulse in each pulse group needs to be reduced, such as... Figure 6 As shown, the specific reduction value is Δt1, which can be understood as being greater than 0. Furthermore, since the total width of the extinguishing level still needs to be maintained at TT, Δt1 needs to be evenly distributed and compensated onto M second pulses P12 in each pulse group. Therefore, the extinguishing level width of each second pulse P12 is T1 + Δt1 / M. Thus, the goal of SVM improvement is achieved.

[0125] In the aforementioned analysis, the pulse width of the first pulse of the emission control signal at the first luminance node within a frame is reduced to improve the SVM metric, but this results in a luminance inversion problem at the first luminance node DBV1. In this embodiment, as... Figure 6 As shown, in this embodiment, the luminance control signals for all luminance nodes with luminance levels greater than the first luminance node DBV1 are configured such that the extinguishing level width of the first pulse within a frame T is smaller than the extinguishing level width of the first pulse. This ensures that as the luminance level decreases, the width of the first pulse of the luminance control signal increases unidirectionally, without sudden decrease during the increase, thus avoiding luminance reversal. For example, at the same gray level or maximum gray level, the higher the luminance level of the luminance node, the greater the corresponding luminance. Optionally, N is an integer greater than or equal to 2. Optionally, M is an integer greater than or equal to 2. For example, T1 is the ratio of the sum of the extinguishing level widths of the first pulse and M second pulses in the same first pulse group to the number of pulses in the first pulse group (i.e., M+1).

[0126] The total width of the off level of the light emitting control signal in a frame (e.g. the sum of the off level width of all pulses in a frame) gradually increases with the decrease of the brightness level, and the off level width of the first pulse also gradually increases with the decrease of the brightness level. The first brightness node can be set in the low brightness level range. The first brightness node can be the SVM improvement node. Exemplarily, the brightness corresponding to the first brightness node is, for example, 2 nits.

[0127] The technical scheme of the embodiment, the display panel comprises a first brightness node; the light modulation method of the display panel comprises receiving a light emitting control signal, the light emitting control signal under the first brightness node comprises N first pulse groups in a frame, N is an integer greater than or equal to 1; the first pulse group comprises one first pulse and M second pulses after the first pulse, M is an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, and Δt1 is greater than zero; T1-Δt1 is greater than zero, the brightness level of the display panel is greater than the brightness level of the first brightness node, and the off level width of the first pulse of the light emitting control signal under the brightness node adjacent to the first brightness node is less than the off level width of the first pulse. The off level width of the light emitting control signal under all brightness nodes with brightness levels greater than the brightness level of the first brightness node is less than the off level width of the first pulse in a frame, so that the width of the first pulse of the light emitting control signal gradually increases in one direction with the decrease of the brightness level, and the sudden decrease in the increasing process is avoided, thereby avoiding the brightness reversal problem. T1 can be the average of the off level width of the first pulse and the M second pulses in the same first pulse group divided by the number of pulses in the first pulse group, that is, the average of the off level width. T1 can be the sum of the off level width of all pulses of the light emitting control signal under the first brightness node in a frame divided by the number of pulses, that is, the average of the off level width. The off level width of the first pulse is T1-Δt1, which is equivalent to the off level width of the first pulse being smaller than the average of the off level width corresponding to the first brightness node by Δt1, and the off level width of the second pulse is T1+Δt1 / M, which is equivalent to the off level width of the second pulse being larger than the average of the off level width corresponding to the first brightness node by Δt1 / M, which is equivalent to the difference (i.e. Δt1) between the average of the off level width corresponding to the first brightness node and the off level width of the first pulse being M times the difference (i.e. Δt1 / M) between the average of the off level width corresponding to the first brightness node and the off level width of the second pulse. N can be 2, 3, 4 or 5, etc. M can be 2, 3, 4 or 5, etc. Figure 6 An example is shown where N can be 3 and M can be 3.

[0128] Optionally, with continued reference to Figure 6 The display panel comprises a plurality of second brightness nodes DBV2, the luminance level of the second brightness nodes DBV2 is greater than the luminance level of the first brightness nodes DBV1; the off level width of the first pulse of the light emitting control signal under the second brightness nodes DBV2 adjacent to the first brightness nodes DBV1 in a frame T (may be each frame in one frame or multiple frames under a preset refresh frequency) is less than the off level width of the first pulse P11. For example, the on level width of the first pulse of the light emitting control signal under the second brightness nodes DBV2 adjacent to the first brightness nodes DBV1 in a frame T (may be each frame in one frame or multiple frames under a preset refresh frequency) is greater than the on level width of the first pulse P11. The light emitting control signal of each brightness node in the present application can correspond to the same refresh frequency. For example, under the same refresh frequency, the sum of the off level width and the on level width of each pulse of the light emitting control signal of each brightness node (i.e. the pulse period) is equal. For example, under the same refresh frequency, the number of pulses in a frame of the light emitting control signal of each brightness node is equal.

[0129] For example, under the plurality of second brightness nodes DBV2, the off level width of the first pulse of the light emitting control signal in a frame increases with the decrease of the luminance level. For example, under the plurality of second brightness nodes DBV2, the on level width of the first pulse of the light emitting control signal in a frame decreases with the decrease of the luminance level.

[0130] Specifically, by inserting the second brightness nodes DBV2, the off level width of the first pulse of the light emitting control signal corresponding to the second brightness nodes DBV2 in a frame is less than the off level width of the first pulse of the first brightness nodes DBV1, and increases with the decrease of the luminance level. The first brightness nodes DBV1 and the plurality of second brightness nodes DBV2, the off level width of the first pulse of the light emitting control signal in a frame presents an increasing trend with the decrease of the luminance level, which improves the luminance inversion problem; at the same time, it can also make the luminance transition more smooth on the basis of improving the SVM index and improving the luminance inversion problem.

[0131] For example, under the plurality of second brightness nodes, the off level width of the first pulse of the light emitting control signal in a frame T increases non-linearly with the decrease of the luminance level. For example, under the plurality of second brightness nodes, the on level width of the first pulse of the light emitting control signal in a frame T decreases non-linearly with the decrease of the luminance level.

[0132] For example, the non-linear increase can be a curve or a polyline or a stepwise trend increase. For example, the non-linear decrease can be a curve or a polyline or a stepwise trend decrease.

[0133] Optionally, Figure 8A second luminance node first pulse of the extinguishing level width variation trend diagram provided for the embodiment of the present application, reference Figure 6 and Figure 8 The difference between the first pulse of the extinguishing level width of the light emitting control signal under the k+1th second luminance node DBV2(k+1) and the first pulse of the extinguishing level width of the light emitting control signal under the kth second luminance node DBV2(k) in a frame T (for example, D k+1 -D k ), and the ratio of the difference between the luminance levels of the kth second luminance node DBV2(k) and the k+1th second luminance node DBV2(k+1) (for example, L k -L k+1 ) (for example, (D k+1 -D k ) / (L k -L k+1 )) is different from the difference between the first pulse of the extinguishing level width of the light emitting control signal under the kth second luminance node DBV2(k) and the first pulse of the extinguishing level width of the light emitting control signal under the k-1th second luminance node DBV2(k-1) in a frame T (for example, D k -D k-1 ), and the ratio of the difference between the luminance levels of the k-1th second luminance node DBV2(k-1) and the kth second luminance node DBV2(k) (for example, L k-1 -L k ) (for example, (D k -D k-1 ) / (L k-1 -L k )) is different; wherein the luminance level L k of the kth second luminance node DBV2(k) is greater than the luminance level L k+1 of the k+1th second luminance node DBV2(k+1); k is an integer greater than or equal to 2. For example, the ratio (D k+1 -D k ) / (L k -L k+1 ) is different from the ratio (D k -D k-1 ) / (L k-1 -L k ). For example, the absolute value of the ratio (D k+1 -D k ) / (L k -L k+1 ) is different from the absolute value of the ratio (D k -D k-1 ) / (L k-1 -L k ). For example, Dk The off-level width of the first pulse of the light emitting control signal in a frame for the kth second brightness node. The brightness level of the kth second brightness node DBV2(k) can correspond to L k .

[0134] Specifically, as shown in Figure 6 and Figure 8 , in the embodiment, for the plurality of second brightness nodes DBV2, the off-level width of the first pulse of the light emitting control signal presents a non-linear change as the brightness level decreases. When the first brightness node DBV1 is not configured as the SVM improvement node, the off-level width of the first pulse of the light emitting control signal should present a linear increasing trend as the brightness level decreases. When the off-level width of the first pulse of the first brightness node DBV1 (as the SVM improvement node) is decreased, if the off-level width of the first pulse of each second brightness node is still configured in a manner that the off-level width of the first pulse of the light emitting control signal linearly changes as the brightness level decreases, the implementation is difficult, or the off-level width of the first pulse of the light emitting control signal in a frame T for the second brightness node DBV2 is greater than the off-level width of the first pulse of the first brightness node DBV1. In the embodiment, the off-level width of the first pulse of the light emitting control signal of the plurality of second brightness nodes DBV2 non-linearly changes with the brightness level, which is easier to implement, i.e., the difficulty of the dimming scheme implementation can be reduced, and the off-level width of the first pulse of the light emitting control signal in a frame T for the second brightness node DBV2 is avoided to be greater than the off-level width of the first pulse.

[0135] Optionally, continuing to refer to Figure 8 , the difference (e.g., D k+1 -D k ) between the off-level width of the first pulse of the light emitting control signal in a frame T for the kth second brightness node DBV2(k) and the off-level width of the first pulse of the light emitting control signal in a frame T for the k+1th second brightness node DBV2(k+1) is greater than (corresponding to a non-linear change) or equal to (corresponding to a linear change) the absolute value of the ratio of the difference (e.g., L k -L k+1 ) between the brightness levels of the kth second brightness node DBV2(k) and the k+1th second brightness node DBV2(k+1), and the difference (e.g., D k -D k-1), the difference between the luminance level of the k-1th second luminance node DBV2(k-1) and the luminance level of the kth second luminance node DBV2(k) (for example, L k-1 -L k ) of the k-1th second luminance node DBV2(k-1) and the luminance level of the kth second luminance node DBV2(k) (for example, L k+1 -D k ) / (L k -L k+1 ) of the k-1th second luminance node DBV2(k-1) and the luminance level of the kth second luminance node DBV2(k) (for example, L k -D k-1 ) / (L k-1 -L k ) of the k-1th second luminance node DBV2(k-1) and the luminance level of the kth second luminance node DBV2(k) (for example, L k+1 -D k ) / (L k -L k+1 ) of the k-1th second luminance node DBV2(k-1) and the luminance level of the kth second luminance node DBV2(k) (for example, L k -D k-1 ) / (L k-1 -L k ) of the k-1th second luminance node DBV2(k-1) and the luminance level of the kth second luminance node DBV2(k) (for example, L

[0136] Specifically, in the present embodiment, the variation amount or the variation rate of the extinguishing level width of the first pulse of the light emitting control signal becomes larger and larger with the decrease of the luminance level, which can be similar to an exponential variation trend, and can make the luminance variation transition more and more smooth with the decrease of the luminance level.

[0137] Optionally, continuing to refer to Figure 6, the light emitting control signal under the second brightness node DBV2 includes N second pulse groups P2 in a frame T; the second pulse group P2 includes a third pulse P21 and M fourth pulses P22 after the third pulse P21; the off level width of the third pulse P21 in different second pulse groups P2 in a frame is the same. For example, under the same second brightness node DBV2, the off level width of the third pulse P21 in the N second pulse groups P2 is the same, the off level width of the fourth pulse P22 in the same second pulse group P2 is the same or different, the off level width of the fourth pulse P22 in the corresponding position in the N second pulse groups P2 is the same, for example, the off level width of the first fourth pulse P22 in the first to Nth second pulse groups P2 is the same, for example, the off level width of the second fourth pulse P22 in the first to Nth second pulse groups P2 is the same, for example, the off level width of the second fourth pulse P22 in the first to Nth second pulse groups P2 is the same, for example, the off level width of the M-1th fourth pulse P22 in the first to Nth second pulse groups P2 is the same. For example, the off level width of the Mth fourth pulse P22 in the first to Nth second pulse groups P2 is the same. For example, under the same second brightness node DBV2, the off level width of the pulses in the corresponding position in the N second pulse groups P2 is the same, the on level width of the pulses in the corresponding position in the N second pulse groups P2 is the same, the on level width of the fourth pulse P22 in the corresponding position in the N second pulse groups P2 is the same, the off level width of the third pulse P21 in the corresponding position in the N second pulse groups P2 is the same, the on level width of the third pulse P21 in the corresponding position in the N second pulse groups P2 is the same.

[0138] Specifically, in the embodiment, the off level width of each third pulse in a frame T is configured to be the same under the light emitting control signal of the second brightness node DBV2. That is to say, when the second brightness node DBV2 is configured, not only the off level width of the first pulse is reduced, but also the off level width of the first pulse in other second pulse groups P2 is reduced, which can not only improve the SVM index of the display panel, but also is easier to implement.

[0139] For example, the off level width of the fourth pulse in the same second pulse group in a frame is the same. Alternatively, the off level width of the fourth pulse in different second pulse groups in a frame is the same; the off level width of the third pulse in the same second pulse group in a frame under the light emitting control signal of the kth second brightness node is T2 k -Δt2 k , the off level width of the fourth pulse in the same second pulse group in a frame under the light emitting control signal of the kth second brightness node is T2 k +Δt2 k / M; T2 k is a second set value, Δt2 k is a second adjustment value, T2k greater than zero, Δt2 k greater than zero; T2 k - Δt2 k greater than zero. For example, T2 k is the average of the off-level width of the third pulse and the M fourth pulses in the same second pulse group of the light emitting control signal under the kth second brightness node, i.e. T2 k is the average of the off-level width of all pulses in a frame of the light emitting control signal under the kth second brightness node. The off-level width of the third pulse is T2 k - Δt2 k , which is equivalent to the off-level width of the third pulse being smaller than the average of the off-level width of the kth second brightness node by Δt2 k , the off-level width of the fourth pulse is T2 k + Δt2 k / M, which is equivalent to the off-level width of the fourth pulse being larger than the average of the off-level width of the kth second brightness node by Δt2 k / M, which is equivalent to the difference (i.e. Δt2 k ) between the off-level width of the fourth pulse and the average of the off-level width of the kth second brightness node being M times of the difference (i.e. Δt2 k / M) between the off-level width of the third pulse and the average of the off-level width of the kth second brightness node.

[0140] For example, the off-level width of at least two fourth pulses in the same second pulse group in a frame is different. Alternatively, with reference to Figure 6 and Figure 7 , the off-level width of the third pulse P21 in the same second pulse group P2 in a frame T of the light emitting control signal under the kth second brightness node DBV2(k) is T2 k - Δt2 k , the total off-level width (i.e. the sum of the off-level width of the M fourth pulses) of the M fourth pulses is M*T2 k + Δt2 k - Δt3 k , T2 k is a second set value, Δt2 k is a second adjustment value, Δt3 k is a third adjustment value, T2 k is greater than zero, Δt2 k is greater than zero, Δt3 k is greater than zero. T2 k - Δt2 k is greater than zero. M*T2k + Δt2 k - Δt3 k is greater than zero.

[0141] Optionally, the extinguishing level width of the fourth pulse in the same second pulse group in a frame is different from the extinguishing level width of at least one third pulse.

[0142] For example, under the kth second brightness node DBV2(k), the extinguishing level width of the M fourth pulses in the same second pulse group P2may be the same or different, for example, the extinguishing level width of m1 fourth pulses is T2 k + Δt2 k / M, and the extinguishing level width of m2 fourth pulses is T2 k + Δt2 k / M - Δt3 k / m2, m1 is an integer greater than or equal to 1, m2 is an integer greater than or equal to 1, and m1 + m2 = M. For example, M is an integer greater than or equal to 2.

[0143] For example, under the kth second brightness node DBV2(k), the extinguishing level width of v fourth pulses in the M fourth pulses in the same second pulse group is T2 k + Δt2 k / M - Δt3 k / v, v is an integer greater than or equal to 1, and v is less than or equal to M.

[0144] For example, v is an integer greater than or equal to 2. For example, v is equal to 3.

[0145] For example, Δt3 corresponding to the kth second brightness node k is greater than or equal to Δt3 corresponding to the k+1th second brightness node k+1 .

[0146] Specifically, in the embodiment, N*(M+1)*T2 corresponding to the plurality of second brightness nodes increases with the decrease of the brightness level of the second brightness node. For example, N*(M+1)*T2 corresponding to the plurality of second brightness nodes is linearly related to the brightness level. N*(M+1)*T2 corresponding to the plurality of second brightness nodes linearly increases with the decrease of the brightness level of the second brightness node. That is to say, in the related art, the total width of the extinguishing level of the second brightness node is N*(M+1)*T2, which is related to the brightness of the second brightness node, and is linearly related to the brightness level. In other words, N*(M+1)*T2 corresponding to the k+1th second brightness node DBV2(k+1) k+1 and N*(M+1)*T2 corresponding to the kth second brightness node DBV2(k) k is different (for example, N*(M+1)*T2 k+1-N*(M+1)*T2 k The difference between the brightness levels of the k-th second brightness node and the (k+1)-th second brightness node (e.g., L) k -L k+1 The absolute value of the ratio is equal to N*(M+1)*T2 corresponding to the k-th second brightness node. k The N*(M+1)*T2 corresponding to the (k-1)th second brightness node k-1 The difference (e.g., N*(M+1)*T2) k -N*(M+1)*T2 k-1 The difference between the brightness levels of the (k-1)th and kth second brightness nodes (e.g., L) k-1 -L k The absolute value of the ratio [N*(M+1)*T2]. For example, the ratio [N*(M+1)*T2] k+1 -N*(M+1)*T2 k ] / (L k -L k+1 The absolute value of ) is equal to the ratio [N*(M+1)*T2] k -N*(M+1)*T2 k-1 ] / (L k-1 -L k The absolute value of ). For example, the ratio [N*(M+1)*T2] k+1 -N*(M+1)*T2 k ] / (L k -L k+1 The ratio [N*(M+1)*T2] is equal to the ratio [N*(M+1)*T2] k -N*(M+1)*T2 k-1 ] / (L k-1 -L k ).

[0147] T2 k -Δt2 k The subscript k in the figure represents the k-th second brightness node. The T2 and Δt2 are different for different second brightness nodes. In this embodiment, the extinguishing level width of the third pulse P21 is reduced by Δt2 based on the corresponding T2, so that the extinguishing level width of the third pulse of the emission control signal increases as the brightness level decreases within a frame, thereby improving the brightness inversion problem.

[0148] in addition, Figure 9 A timing diagram for another dimming method for a display panel provided in an embodiment of the present invention. Figure 9 The diagram shows the timing of the emission control signals at each brightness level between two adjacent second brightness nodes and between two adjacent second brightness nodes. For ease of understanding, [the diagram is shown in the original text]. Figure 9In the middle, for each third brightness node DBV3, the pulse with different off-level width from the second brightness node DBV2(3) is marked with a red arrow. Since the off-level width of the third pulse P21 in each second pulse group P2 is reduced compared to T2 at the second brightness node DBV2. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. Figure 8 In the middle, for each third brightness node DBV3, the pulse with different off-level width from the second brightness node DBV2(3) is marked with a red arrow. Since the off-level width of the third pulse P21 in each second pulse group P2 is reduced compared to T2 at the second brightness node DBV2. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. Figure 9 In the middle, for each third brightness node DBV3, the pulse with different off-level width from the second brightness node DBV2(3) is marked with a red arrow. Since the off-level width of the third pulse P21 in each second pulse group P2 is reduced compared to T2 at the second brightness node DBV2. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. Figure 9 In the middle, for each third brightness node DBV3, the pulse with different off-level width from the second brightness node DBV2(3) is marked with a red arrow. Since the off-level width of the third pulse P21 in each second pulse group P2 is reduced compared to T2 at the second brightness node DBV2. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. In the middle, the off-level width of the pulse corresponding to the kth second brightness node DBV2, and the brightness level higher than the kth second brightness node DBV2(i.e. the third brightness node DBV3(5)) is adjacent to the kth second brightness node DBV2, is changed by Δt3. k, so that the total width of the off level of the light emitting control signal under the kth second brightness node DBV2 is less different from the total width of the off level of the light emitting control signal under the brightness node (i.e. the third brightness node) adjacent to the kth second brightness node DBV2 and having a brightness level greater than the kth second brightness node, thereby improving the problem of brightness change out of specification; for example, the total width of the off level of the light emitting control signal under the second brightness node DBV2 (4) and the third brightness node DBV3 (5) is less different within a frame. And the difference between the total width of the off level of the light emitting control signal under the above two brightness nodes (i.e. the kth second brightness node DBV2 and the brightness node adjacent to the kth second brightness node DBV2 and having a brightness level greater than the kth second brightness node) and the total width of the off level of the light emitting control signal under the other two adjacent brightness nodes (such as the two third brightness nodes adjacent to the k-1th second brightness node DBV2 and the kth second brightness node DBV2) is closer, thereby making the brightness adjustment smoother.

[0149] Optionally, with reference to Figure 6 and Figure 7 , in the same second pulse group P2 corresponding to the kth second brightness node, the off level width of one fourth pulse P22 (such as the first fourth pulse P22, the second fourth pulse P22, the third fourth pulse P22 or the Mth fourth pulse P22) of the M fourth pulses P22 is T2 k + Δt2 k / M - Δt3 k , and the off level width of the other fourth pulses is T2 k + Δt2 k / M. For example, M is equal to 3.

[0150] For example, in the same second pulse group corresponding to the kth second brightness node, the off level width of the third pulse is T2 k - Δt2 k , which means that the off level width of the third pulse is less than the average off level width corresponding to the kth second brightness node by Δt2 k , and the off level width of at least one fourth pulse is T2 k + Δt2 k / M, which means that the off level width of the fourth pulse is greater than the average off level width corresponding to the kth second brightness node by Δt2 k / M, which means that the difference (i.e. Δt2 k ) between the average off level width corresponding to the kth second brightness node and the off level width of the third pulse is M times the difference (i.e. Δt2 k / M) between the off level width of the fourth pulse and the average off level width corresponding to the kth second brightness node.

[0151] Specifically, if the brightness variation overspecification scheme is not considered, for each second brightness node, the extinguishing level width of the third pulse P21 in each second pulse group P2 is reduced by an amount Δt2 compared to T2, and the compensation needs to be evenly distributed to the M fourth pulses P21 in the same second pulse group P2, that is, the extinguishing level width of each fourth pulse P22 at this time should be T2 k + Δt2 k / M. To improve the brightness variation overspecification problem, the total extinguishing level width of the M fourth pulses is reduced by Δt3, which can be specifically subtracted from one of the fourth pulses P21, and the other fourth pulses P21 remain unchanged. In other embodiments, Δt3 can also be evenly distributed, and the extinguishing level width of each fourth pulse P21 is reduced by the same amount.

[0152] Optionally, with reference to Figure 9 , the display panel comprises a plurality of third brightness nodes DBV3, at least one (for example, one or more) third brightness node DBV3 is included between adjacent two second brightness nodes DBV2; the light emission control signal under the third brightness node DBV3 comprises N third pulse groups P3 in a frame; the third pulse group P3 comprises a fifth pulse P31 and M sixth pulses P32 located after the fifth pulse P31; N is an integer greater than or equal to 2; the extinguishing level width of the fifth pulse P31 in different third pulse groups P3 in a frame is the same.

[0153] The extinguishing level width of the fifth pulse P31 in a frame of the light emission control signal under the third brightness node DBV3 located between the kth second brightness node DBV2(k) and the (k+1)th second brightness node DBV2(k+1) is the same as the extinguishing level width of the third pulse P21 in a frame of the light emission control signal of the kth second brightness node DBV2(k); wherein the brightness level of the kth second brightness node DBV2(k) is greater than the brightness level of the (k+1)th second brightness node DBV2(k+1).

[0154] Therefore, as the brightness level decreases, the extinguishing level width of the first pulse of the third brightness node DBV3 between the kth second brightness node DBV2(k) and the (k+1)th second brightness node DBV2(k+1) does not exceed the extinguishing level width of the first pulse of the (k+1)th second brightness node DBV2(k+1).

[0155] Optionally, with reference to Figure 9 , the total extinguishing level width of all sixth pulses in N third pulse groups P3 in a frame of the light emission control signal under the ith third brightness node DBV3 located between the kth second brightness node DBV2(k) and the (k+1)th second brightness node is N*(M*T2 k + Δt2k )+i*ΔH-N*Δt3 k(i) , Δt3 k(i) is greater than or equal to 0 and less than Δt3 k , Δt3 k(i) decreases with the increase of i, or Δt3 k(i) decreases first and then remains unchanged with the increase of i, ΔH is a fourth adjustment value, ΔH is greater than 0; wherein the luminance level of the kth second luminance node DBV2(k) is greater than the luminance level of the k+1th second luminance node DBV2(k+1). i is an integer greater than or equal to 1. For example, ΔH is a fixed constant. For example, Δt3 k(i) decreases first and then becomes 0 with the increase of i. ΔH can also be a variable value.

[0156] For example, one or more third luminance nodes DBV3 located between the kth second luminance node DBV2(k) and the k+1th second luminance node DBV2(k+1) and adjacent to the k+1th second luminance node DBV2(k+1), the corresponding Δt3 k(i) is equal to 0.

[0157] Specifically, in the embodiment, ΔH is the difference between the total width of the extinguishing level in one frame of the light control signal of the adjacent two third luminance nodes DBV3 when the luminance change out-of-specification compensation is not considered. When the luminance change out-of-specification compensation is considered, Δt3 k(i) is compensated in the corresponding M sixth pulses P31 of each third pulse group P3. Therefore, N third pulse groups P3 compensate N*Δt3 k(i) in total. As shown in FIG. 7, for the convenience of illustration, Figure 8 only the Δt3 Figure 9 corresponding to the third luminance nodes is marked in FIG. 7. k(i) In the embodiment, with the decrease of the luminance level, the value of Δt3 k(i) gradually decreases at the plurality of third luminance nodes, that is, the luminance change out-of-specification problem is gradually compensated at the plurality of third luminance nodes, and the value of Δt3 is reduced to zero before the next second luminance node arrives, avoiding that the total pulse width of the extinguishing level of the next second luminance node is too different from the total pulse width of the extinguishing level of the current second luminance node, thereby affecting the compensation effect.

[0158] Optionally, continuing to refer to Figure 9the light emission control signal of the ith third brightness node DBV3 is obtained by shortening the initial light emission control signal by a plurality of initial sixth pulses by a preset time; wherein the initial light emission control signal includes N initial third pulse groups corresponding to N third pulse groups P3 in a frame; the initial third pulse group includes an initial fifth pulse corresponding to the fifth pulse P31 and M initial sixth pulses corresponding to M sixth pulses P32; and the sum of the preset times corresponding to each initial pulse group is equal to Δt3 corresponding to the third brightness node k(i) ; the ith third brightness node DBV3(i) and the (i-1)th third brightness node DBV3(i-1) between two adjacent second brightness nodes DBV2 have different off-level widths of the bth initial sixth pulse in the ath initial third pulse group in the initial light emission control signal corresponding thereto in a frame; wherein when i is not an integer multiple of N, a is the remainder of i / N and b is the quotient of (i+N) / N; when i is an integer multiple of N, a is N and b is i / N; and i is greater than or equal to 2.

[0159] Specifically, the light emission control signal of the ith third brightness node DBV3 can be obtained by subtracting N*Δt3 k(i) from the initial light emission control signal. In the light emission control signal of the ith third brightness node DBV3, the total width of the M sixth pulses P32 in each third pulse group (i.e. the sum of the off-level widths) is reduced by Δt3 k(i) compared to the total width of the corresponding M initial sixth pulses P32. In some embodiments, one sixth pulse can be reduced by Δt3 k(i)The obtained sixth pulse can also be obtained by reducing the preset time / m2 of each of the at least two (for example, m2, m2=v) sixth pulses based on the initial sixth pulse. In addition, the initial light-emitting control signal corresponding to the third brightness node DBV3 between the two adjacent second brightness nodes DBV2 still satisfies the interpolation algorithm described above. That is, the initial light-emitting control signal corresponding to the first third brightness node between the kth second brightness node and the k+1th second brightness node is different from the extinguishing level width of the first fourth pulse in the first second pulse group in a frame of the light-emitting control signal of the kth second brightness node. The extinguishing level width of the bth initial sixth pulse in the ath initial third pulse group of the initial light-emitting control signal corresponding to the ith third brightness node and the i-1th third brightness node between the two adjacent second brightness nodes (for example, the kth second brightness node and the k+1th second brightness node) in a frame is different, and more specifically, the extinguishing level width of the bth initial sixth pulse in the ath initial third pulse group of the initial light-emitting control signal corresponding to the ith third brightness node is greater than the extinguishing level width of the bth initial sixth pulse in the ath initial third pulse group of the initial light-emitting control signal corresponding to the i-1th third brightness node in a frame by ΔH.

[0160] Optionally, in at least part of the number of third brightness nodes DBV3 (for example, the third brightness nodes DBV3 between the kth second brightness node and the k+1th second brightness node), the light-emitting control signals of the two adjacent third brightness nodes DBV3 in a frame are different in the extinguishing level width of the sixth pulse P32 corresponding to N pairs or v*N+1 pairs of positions. V is an integer greater than or equal to 1 and less than or equal to M. Specifically, in this embodiment, the sixth pulse P32 in the third pulse group is shortened by Δt3 k(i) For example, in the same initial third pulse group, when the extinguishing level width of an initial sixth pulse is shortened by Δt3 k(i) and a sixth pulse is obtained by adding ΔH again, the light-emitting control signals of the two adjacent third brightness nodes DBV3 in a frame are different in the extinguishing level width of the sixth pulse P32 corresponding to N pairs of positions (that is, there is a pair in each third pulse group in the N third pulse groups). When the extinguishing level width of an initial sixth pulse in each third pulse group in the N-1 initial third pulse groups is shortened by Δt3 k(i) and the extinguishing level width of an initial sixth pulse in one third pulse group is shortened by Δt3 k(i)When the extinguishing level width of the first sixth pulse P32 in the first third pulse group P3 in a frame is different from the extinguishing level width of the first fourth pulse in the second third pulse group P4 in the frame, the first sixth pulse P32 in the first third pulse group P3 in a frame is different from the first sixth pulse P32 in the first third pulse group P3 in the next frame.

[0161] Optionally, the extinguishing level width of the first sixth pulse P32 in the first third pulse group P3 in a frame under the first third luminance node DBV3 between the adjacent two second luminance nodes DBV2 is greater than the extinguishing level width of the first fourth pulse in the second third pulse group P4 in the frame under the second luminance node DBV2 with a greater luminance level. For example, the extinguishing level width of the first sixth pulse P32 in the first third pulse group P3 in a frame under the first third luminance node DBV3 between the kth second luminance node DBV2(k) and the (k+1)th second luminance node DBV2(k+1) is greater than the extinguishing level width of the first fourth pulse in the second third pulse group P4 in the frame under the kth second luminance node DBV2(k). k can be an integer greater than or equal to 1. For example, the extinguishing level width of the first sixth pulse P32 in the first third pulse group P3 in a frame under the first third luminance node DBV3 between the (k-1)th second luminance node DBV2(k-1) and the kth second luminance node DBV2(k) is greater than the extinguishing level width of the first fourth pulse in the second third pulse group P4 in the frame under the (k-1)th second luminance node DBV2(k-1). k can be an integer greater than or equal to 2.

[0162] Optionally, i is greater than or equal to 2 and less than or equal to N, the extinguishing level width of the first sixth pulse in the i-th third pulse group in a frame under the i-th third luminance node (i.e. the i-th third luminance node between the adjacent two second luminance nodes DBV2) is greater than the extinguishing level width of the first sixth pulse in the i-th third pulse group in a frame under the (i-1)-th third luminance node.

[0163] Optionally, i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the extinguishing level width of the w-th sixth pulse in the i-(w-1)*N-th third pulse group in a frame under the i-th third luminance node is greater than the extinguishing level width of the w-th sixth pulse in the i-(w-1)*N-th third pulse group in a frame under the (i-1)-th third luminance node. Optionally, w is greater than or equal to 2 and less than or equal to M.

[0164] Optionally, in the third luminance nodes DBV3 between the two adjacent second luminance nodes DBV2, the off-level width of the first sixth pulse P32 of the first third pulse group P3 in a frame of the light emitting control signal under the first third luminance node is greater than the off-level width of the first fourth pulse of the light emitting control signal under the second luminance node DBV2 with a greater luminance level by ΔH, or the difference between the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node and the off-level width of the first fourth pulse of the light emitting control signal under the second luminance node DBV2 with a greater luminance level is greater than or equal to ΔH-Δt3 (1) For example, in the third luminance nodes between the kth second luminance node and the (k+1)th second luminance node, the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node is greater than the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node by ΔH, or the difference between the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node and the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node is greater than or equal to ΔH-Δt3 k(1) For example, in the third luminance nodes between the kth second luminance node and the (k+1)th second luminance node, the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node is greater than the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node by ΔH, or the difference between the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node and the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node is greater than or equal to ΔH-Δt3 k-1(1) For example, in the third luminance nodes between the kth second luminance node and the (k+1)th second luminance node, the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node is greater than the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node by ΔH, or the difference between the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node and the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node is greater than or equal to ΔH-Δt3

[0165] For example, in the third luminance nodes between the kth second luminance node and the (k+1)th second luminance node, the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node is greater than the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node by ΔH, or the difference between the off-level width of the first sixth pulse of the first third pulse group in a frame of the light emitting control signal under the first third luminance node and the off-level width of the first fourth pulse of the light emitting control signal under the kth second luminance node is greater than or equal to ΔH-Δt3 k(i-1)-Δt3 k(i) ), for example, equal to ΔH + (Δt3 k(i-1) -Δt3 k(i) ) / v, the extinguishing level width of the sixth pulse P32 corresponding to the position pair in a frame of the light emission control signal under the ith third luminance node DBV3 is different from the extinguishing level width of the sixth pulse P32 corresponding to the position pair in a frame of the light emission control signal under the (i-1)th third luminance node DBV3. k can be an integer greater than or equal to 1.

[0166] And / or, when i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the ith third luminance node DBV3 is greater than the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the (i-1)th third luminance node DBV3 by ΔH, or the difference between the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the ith third luminance node DBV3 and the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the (i-1)th third luminance node DBV3 is greater than or equal to ΔH + (Δt3 k(i-1) -Δt3 k(i) ), for example, equal to ΔH + (Δt3 k(i-1) -Δt3 k(i) ) / v, the extinguishing level width of the sixth pulse P32 corresponding to the position pair in a frame of the light emission control signal under the ith third luminance node DBV3 is different from the extinguishing level width of the sixth pulse P32 corresponding to the position pair in a frame of the light emission control signal under the (i-1)th third luminance node DBV3. k can be an integer greater than or equal to 1.

[0167] And / or, when i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the ith third luminance node DBV3 is greater than the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the (i-1)th third luminance node DBV3 by ΔH, or the difference between the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the ith third luminance node DBV3 and the extinguishing level width of the wth sixth pulse of the ith-(w-1)*Nth third pulse group in a frame of the light emission control signal under the (i-1)th third luminance node DBV3 is greater than or equal to ΔH + (Δt3 k(i-1) -Δt3 k(i) ), for example, equal to ΔH + (Δt3 k(i-1) -Δt3 k(i) ) / v, w is greater than or equal to M. k can be an integer greater than or equal to 1.

[0168] In summary, in the above embodiment, the third luminance node between the kth second luminance node and the k+1th second luminance node is configured in the following manner: the total width of the off level of the light emitting control signal under the third luminance node in a frame plus the corresponding N*Δt3 k(i) After that, the off level width of the first sixth pulse in the N third pulse groups is increased by ΔH in turn; the off level width of the second sixth pulse in the N third pulse groups is increased by ΔH in turn; until the off level width of the Mth sixth pulse in the N third pulse groups is increased by ΔH in turn, and then, the off level width of the first sixth pulse in the N third pulse groups is increased by ΔH in turn. The total width of the off level of the light emitting control signal under the third luminance node in a frame plus the corresponding N*Δt3 k(i) After that, that is, considering the compensation of Δt3 k(i) More specifically, before the Mth sixth pulse P32 in the third pulse group is reduced by Δt3 k(i) , the light emitting control signal under each luminance level satisfies the above rules. In other words, from the third luminance node adjacent to the kth second luminance node and having a lower luminance level than the kth second luminance node, the off level width of the first sixth pulse P32 in the first third pulse group is first increased, then the off level width of the first sixth pulse P32 in the second third pulse group is increased with the decrease of the luminance level, and so on. When the off level width of the first sixth pulse P32 in the Nth third pulse group is increased, the off level width of the second sixth pulse P32 in the first third pulse group is increased in the next luminance level, and so on.

[0169] When i is greater than or equal to 1 and less than or equal to N, the off level width of the first sixth pulse P32 in the i th third pulse group in a frame of the light emitting control signal under the i th third luminance node between the k th second luminance node and the k+1 th second luminance node increases by ΔH. When i is greater than or equal to N+1 and less than or equal to 2N, the off level width of the first sixth pulse P32 in the i th third pulse group in a frame of the light emitting control signal under the i th third luminance node between the k th second luminance node and the k+1 th second luminance node increases by ΔH, and the off level width of the second sixth pulse P32 in the i-N th third pulse group increases by ΔH. In this way, when i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the off level width of the first to (w-1) th sixth pulse P32 in the i th third pulse group in a frame of the light emitting control signal under the i th third luminance node between the k th second luminance node and the k+1 th second luminance node increases by ΔH, and the off level width of the second sixth pulse P32 in the i-(w-1)*N th third pulse group increases by ΔH. When i is greater than or equal to M*N+1 and less than or equal to (M+1)*N, the off level width of the first sixth pulse P32 in the i th third pulse group in a frame of the light emitting control signal under the i th third luminance node between the k th second luminance node and the k+1 th second luminance node increases by 2ΔH.

[0170] In addition, it should be noted that the value of ΔH corresponding to different second luminance nodes can be the same or different, for example, the ΔH corresponding to the plurality of third luminance nodes between the k th second luminance node and the k+1 th second luminance node is different from or the same as the ΔH corresponding to the plurality of third luminance nodes between the k-1 th second luminance node and the k th second luminance node, and the present embodiment does not make specific limitation thereon. With the change of the luminance level, the change rule of the light emitting control signal can also be other rules. For example, if the total off level width of adjacent luminance levels needs to be configured to change greatly, a plurality of pulses can also be configured to change simultaneously to meet the demand.

[0171] For example, the fourth pulse in the same second pulse group in a frame has the same off-level width. For example, the fourth pulse in different second pulse groups in a frame has the same off-level width. Optionally, w is greater than or equal to 2 and less than or equal to M; the light-emitting control signal under the first third luminance node has a greater off-level width of the first sixth pulse in the first third pulse group in a frame than the off-level width of the first fourth pulse of the light-emitting control signal under the kth second luminance node. And / or, when i is greater than or equal to 2 and less than or equal to N, the light-emitting control signal under the ith third luminance node has a greater off-level width of the first sixth pulse in the ith third pulse group in a frame than the off-level width of the first sixth pulse in the ith third pulse group in a frame of the light-emitting control signal under the (i-1)th third luminance node. And / or, when i is greater than or equal to (w-1)*N+1 and less than or equal to w*N, the light-emitting control signal under the ith third luminance node has a greater off-level width of the wth sixth pulse in the ith-(w-1)*N third pulse group in a frame than the off-level width of the wth sixth pulse in the ith-(w-1)*N third pulse group in a frame of the light-emitting control signal under the (i-1)th third luminance node, w is greater than or equal to 2 and less than or equal to M. And / or, when i is greater than or equal to w*N+1 and less than or equal to (w+1)*N, the light-emitting control signal under the ith third luminance node has a greater off-level width of the wth sixth pulse in the ith-w*N third pulse group in a frame than the off-level width of the wth sixth pulse in the ith-w*N third pulse group in a frame of the light-emitting control signal under the (i-1)th third luminance node, w is greater than or equal to M. It is equivalent to not setting the third adjustment value Δt3 k(i) .

[0172] Optionally, continuing to refer to Figure 6 , the display panel further comprises a plurality of fourth luminance nodes DBV4, the luminance level of the fourth luminance node DBV4 is greater than the luminance level of the second luminance node DBV2; the light-emitting control signal under the fourth luminance node DBV4 comprises N fourth pulse groups P4 in a frame time, and the fourth pulse group P4 comprises M+1 seventh pulses P41. For example, the off-level width of the M+1 seventh pulses P41 in the same fourth pulse group P4 is equal.

[0173] Specifically, the display panel can include a plurality of luminance intervals, such as a first luminance interval LR1, a second luminance interval LR2, and a third luminance interval LR3, and the corresponding maximum luminance of the first luminance interval LR1, the second luminance interval LR2, and the third luminance interval LR3 increases in turn under the same gray scale (for example, under the maximum gray scale). In the first luminance interval LR1, a first luminance node DBV1 is set; in the second luminance interval LR2, a second luminance node DBV2 and a third luminance node DBV3 are set; and in the third luminance interval LR3, a fourth luminance node DBV4 is set. The extinguishing level width of all pulses in the next frame under the fourth luminance node DBV4 is the same, and the specific extinguishing level width is configured according to the corresponding luminance.

[0174] In addition, optionally, the extinguishing level width of the light-emitting control signal under the plurality of fourth luminance nodes DBV4 in a frame is linearly related to the luminance level of the fourth luminance node DBV4. For example, the extinguishing level width of the light-emitting control signal under the plurality of fourth luminance nodes DBV4 in a frame increases with the decrease of the luminance level of the fourth luminance node DBV4. For example, the extinguishing level width of the light-emitting control signal under the plurality of fourth luminance nodes DBV4 in a frame linearly increases with the decrease of the luminance level of the fourth luminance node DBV4.

[0175] Specifically, in the third luminance interval LR3, the luminance level is linearly related to the total width of the extinguishing level of the fourth luminance node DBV4. That is, the ratio of the difference in the total width of the extinguishing level of the fourth luminance node DBV4 to the difference in the luminance level is a fixed value, so that the luminance changes more smoothly when dimming. Since the extinguishing level width of each pulse of the light-emitting control signal under the fourth luminance node DBV4 in a frame time is the same, the extinguishing level width of the first pulse is also linearly related to the luminance level. Specifically, the difference between the extinguishing level width of the light-emitting control signal under the (p+1)th fourth luminance node DBV4(p+1) in a frame and the extinguishing level width of the light-emitting control signal under the pth fourth luminance node DBV4(p) in a frame (for example, D4 p+1 -D4 p ), and the difference between the luminance level of the pth fourth luminance node DBV4(p) and the luminance level of the (p+1)th fourth luminance node DBV4(p+1) (for example, L4 p -L4 p+1 ), the absolute value of the ratio is equal to the difference between the extinguishing level width of the light-emitting control signal under the pth fourth luminance node DBV4(p) in a frame and the extinguishing level width of the light-emitting control signal under the (p-1)th fourth luminance node DBV4(p-1) in a frame (for example, D4 p -D4 p-1), the difference between the luminance level of the pth fourth luminance node DBV4(p) and the luminance level of the (p-1)th fourth luminance node DBV4(p-1) (e.g., L4 p-1 -L4 p ), wherein the luminance level of the pth fourth luminance node DBV4(p) is greater than the luminance level of the (p+1)th fourth luminance node DBV4(p+1), and p is an integer greater than or equal to 2. For example, the absolute value of the ratio of (D4 p+1 -D4 p ) / (L4 p -L4 p+1 ) is equal to the absolute value of the ratio of (D4 p -D4 p-1 ) / (L4 p-1 -L4 p ). For example, the absolute value of the ratio of (D4 p+1 -D4 p ) / (L4 p -L4 p+1 ) is equal to the absolute value of the ratio of (D4 p -D4 p-1 ) / (L4 p-1 -L4 p ).

[0176] Optionally, in some other embodiments, the extinguishing level width of the first seventh pulse in the same fourth pulse group can also be greater than or equal to the extinguishing level width of the remaining seventh pulses.

[0177] Optionally, Figure 10 is another timing diagram of a dimming method of a display panel provided by an embodiment of the present application, referring to Figure 10 , the display panel comprises a plurality of fifth luminance nodes DBV5, and a plurality of fifth luminance nodes DBV5 are arranged between adjacent two fourth luminance nodes DBV4; the total width of the extinguishing level of the light-emitting control signal under the plurality of fifth luminance nodes DBV5 between the adjacent two fourth luminance nodes DBV4 in a frame is linearly related to the corresponding luminance level. For example, the total width of the extinguishing level of the light-emitting control signal under the plurality of fifth luminance nodes between the adjacent two fourth luminance nodes in a frame increases with the decrease of the luminance level of the fifth luminance node. For example, the total width of the extinguishing level of the light-emitting control signal under the plurality of fifth luminance nodes between the adjacent two fourth luminance nodes in a frame linearly increases with the decrease of the luminance level of the fifth luminance node.

[0178] Specifically, the difference between the total width of the extinguishing level of the light-emitting control signal under the (j+1)th fifth luminance node in a frame and the total width of the extinguishing level of the light-emitting control signal under the jth fifth luminance node in a frame (e.g., D5 j+1 -D5j ), the absolute value of the ratio of the difference (e.g. L5 j -L5 j+1 ) between the luminance levels of the jth fifth luminance node and the j+1th fifth luminance node, is equal to the difference (e.g. D5 j -D5 j-1 ) between the off-level width of the light-emitting control signal under the jth fifth luminance node in a frame and the off-level width of the light-emitting control signal under the j-1th fifth luminance node in a frame, and the absolute value of the ratio of the difference (e.g. L5 j-1 -L5 j ) between the luminance levels of the j-1th fifth luminance node and the jth fifth luminance node; wherein the luminance level of the jth fifth luminance node is greater than the luminance level of the j+1th fifth luminance node; j is an integer greater than or equal to 2. For example, the ratio (D5 j+1 -D5 j ) / (L5 j -L5 j+1 ) is equal to the ratio (D5 j -D5 j-1 ) / (L5 j-1 -L5 j ). For example, the absolute value of the ratio (D5 j+1 -D5 j ) / (L5 j -L5 j+1 ) is equal to the absolute value of the ratio (D5 j -D5 j-1 ) / (L5 j-1 -L5 j ). The luminance levels of the fifth luminance nodes are luminance levels automatically calculated by the driving chip. The luminance levels of any two adjacent fifth luminance nodes are adjacent, and the total off-level width difference between any two adjacent fifth luminance nodes is the same. Thus, smooth luminance adjustment can be achieved.

[0179] Optionally, the light-emitting control signal under the fifth luminance node includes N fifth pulse groups P5 in a frame; the fifth pulse group P5 includes M+1 eighth pulses P51, and the off-level widths of the eighth pulses P51 corresponding to only one pair of positions of the light-emitting control signals of the adjacent two fifth luminance nodes DBV5 in a frame are different.

[0180] For example, among multiple fifth brightness nodes between two adjacent fourth brightness nodes (e.g., the p-th fourth brightness node DBV4(p) and the (p+1)-th fourth brightness node DBV4(p+1), where p can be an integer greater than or equal to 1), when j is greater than or equal to 1 and less than or equal to N, the extinguishing level width of the first eighth pulse of the first j fifth pulse groups of the emission control signal under the j-th fifth brightness node within a frame is greater than the extinguishing level width of the seventh pulse of the emission control signal under the fourth brightness node with a larger brightness level among the two adjacent fourth brightness nodes (e.g., the p-th fourth brightness node DBV4(p)); j is greater than or equal to (q-1)*N+1 and less than or equal to q. When N, the extinguishing level width of the first q-1 eighth pulses and the first j-(q-1)*N fifth pulse groups of the emission control signal under the j-th fifth brightness node within a frame is greater than the extinguishing level width of the seventh pulse of the emission control signal under the fourth brightness node with the larger brightness level among the two adjacent fourth brightness nodes by the fifth adjustment value; q is greater than or equal to 2 and less than or equal to M; the fifth adjustment value is greater than 0; for example, the fifth adjustment value is a fixed constant greater than 0. The fifth adjustment value can also be a variable value.

[0181] Optionally, the extinguishing level width of the bth eighth pulse in the ath eighth pulse group is different for the corresponding light emission control signals of the jth fifth brightness node and the (j-1)th fifth brightness node between two adjacent fourth brightness nodes within one frame; wherein, when j is not an integer multiple of N, a is the remainder of j / N and b is the quotient of (j+N) / N; when j is an integer multiple of N, a is M and b is j / N; j is greater than or equal to 2.

[0182] Specifically, the emission control signal of the fifth brightness node DBV5 between two adjacent fourth brightness nodes DBV4 (e.g., the p-th fourth brightness node DBV4(p) and the (p+1)-th fourth brightness node DBV4(p+1)) is configured as follows: Based on the p-th fourth brightness node, as the brightness level decreases step by step, firstly, the extinguishing level width of the first eighth pulse in the N fifth pulse groups is increased sequentially; then, the extinguishing level width of the second eighth pulse in the N fifth pulse groups is increased sequentially; until the extinguishing level width of the (M+1)-th eighth pulse in the N fifth pulse groups is increased sequentially. In other words, as... Figure 9 As shown, as the brightness level increases, based on the p-th fourth brightness node, the extinguishing level width of the first eighth pulse in the first fifth pulse group is first increased to obtain the first fifth brightness node DBV5(1); then, based on the first fifth brightness node DBV5(1), the extinguishing level width of the first eighth pulse in the second fifth pulse group is increased to obtain the second fifth brightness node DBV5(2); and so on.

[0183] For example, the fifth adjustment value corresponding to the plurality of fifth luminance nodes between the pth fourth luminance node DBV4(p) and the (p+1)th fourth luminance node DBV4(p+1) is different from or the same as the fifth adjustment value corresponding to the plurality of fifth luminance nodes between the (p-1)th fourth luminance node DBV4(p-1) and the pth fourth luminance node DBV4(p).

[0184] For example, the ΔH corresponding to the plurality of third luminance nodes between the adjacent two second luminance nodes (for example, the kth second luminance node and the (k+1)th second luminance node) is the same as or different from the fifth adjustment value corresponding to the plurality of fifth luminance nodes between the adjacent two fourth luminance nodes (for example, the pth fourth luminance node DBV4(p) and the (p+1)th fourth luminance node DBV4(p+1)).

[0185] Optionally, Figure 11 A timing diagram of another display panel dimming method provided by an embodiment of the present application is shown in FIG. 6. Figure 11 The first luminance node DBV1 is a plurality of, and the luminance levels of the plurality of first luminance nodes DBV1 are sequentially reduced. The light emission control signal under the plurality of first luminance nodes (for example, DBV1(1), DBV1(2)) is the same, that is, the off level width of each pulse in a frame corresponds to the same. Alternatively, the display panel comprises at least one sixth luminance node DBV6, and the luminance level of the sixth luminance node is smaller than the luminance level of the first luminance node. The light emission control signal under the sixth luminance node is the same as the light emission control signal under the first luminance node, that is, the off level width of each pulse in a frame corresponds to the same.

[0186] Specifically, for the luminance node whose luminance level is lower than the luminance level of the first luminance node with the highest luminance level, the luminance thereof is relatively small, at which time the waveform of the light emission control signal can be controlled to remain unchanged, and the luminance is adjusted by adjusting the data voltage of the pixel circuit.

[0187] Optionally, Figure 12 A generation principle diagram of a light emission control signal provided by an embodiment of the present application is shown in FIG. 7. Figure 12 For the light emission control signal of the preset luminance node (for example, the first luminance node, the second luminance node, etc.), the following method is used for generation (wherein the preset luminance node is the luminance node with the off level width of at least two pulses in a frame being different, such as the first luminance node and the second luminance node):

[0188] First, the corresponding preset light emission control signal is generated;

[0189] The preset improvement timing corresponding to the preset luminance node is generated;

[0190] The preset improvement timing is logically operated with the preset emission control signal to generate an emission control signal corresponding to a preset brightness node.

[0191] Specifically, the preset emission control signal EMx can be generated by the driving chip. The preset improvement timing Sx can be generated by the driving chip, and the preset improvement timing Sx can be logically AND operated with the preset emission control signal EMx to obtain the corresponding emission control signal EM. The preset improvement timing is only used to change the pulses of the preset emission control signal used for the initialization stage and / or the data writing stage for resetting the control end of the driving transistor T1, and is not used to change other pulses (such as the black insertion pulse) in the preset emission control signal. In addition, the meaning of the change described in the embodiment can be understood as the change of the emission control signal relative to the preset emission control signal. The preset improvement timing Sx can include N sixth pulse groups, which correspond one by one to N pulse groups of the preset emission control signal EMx and correspond one by one to N pulse groups of the emission control signal EM. Each sixth pulse group includes 2 extinguishing level periods (for example, a first extinguishing level period and a second extinguishing level period) and a lighting level period. The first extinguishing level period overlaps with the extinguishing level period of the first pulse of the corresponding pulse group of the preset emission control signal, and the width of the first extinguishing level period is smaller than the extinguishing level width of the first pulse of the corresponding pulse group of the preset emission control signal. The second extinguishing level period overlaps with the extinguishing level periods of the M pulses after the first pulse of the corresponding pulse group of the preset emission control signal.

[0192] For example, the emission control signal EM is the emission control signal under the first brightness node. In the same pulse group, the time interval between the time when the extinguishing level (for example, high level) of the preset improvement timing Sx jumps to the lighting level (for example, low level) and the time when the extinguishing level (for example, high level) of the first pulse of the preset emission control signal Ex jumps to the lighting level (for example, low level) is (1+1 / M)*Δt1, and the extinguishing level width of each pulse in the preset emission control signal Ex is T1+Δt1 / M. For example, the emission control signal EM is the emission control signal under the kth second brightness node. In the same pulse group, the time interval between the time when the extinguishing level (for example, high level) of the preset improvement timing Sx jumps to the lighting level (for example, low level) and the time when the extinguishing level (for example, high level) of the first pulse of the preset emission control signal Ex jumps to the lighting level (for example, low level) is (1+1 / M)*Δt2 k , and the extinguishing level width of each pulse in the preset emission control signal Ex is T2 k +Δt2 k / M.

[0193] In the embodiment, only a plurality of preset improvement time sequences corresponding to each preset luminance node are needed, and the luminance control signal corresponding to the luminance level between the preset luminance node and the next preset luminance node is calculated by using the preset improvement time sequence. The method has the advantages of less calculation amount and easy implementation.

[0194] The application further provides a dimming method of a display panel, the display panel comprising a first luminance node and a plurality of second luminance nodes, the luminance level of the second luminance node being greater than that of the first luminance node.

[0195] The dimming method comprises: the luminous control signal under the first luminance node comprises N first pulse groups in a frame, N being an integer greater than or equal to 1; the first pulse group comprises one first pulse and M second pulses after the first pulse, M being an integer greater than or equal to 1; the off level width of the first pulse is less than that of the second pulse; the off level width of the first pulse of the luminous control signal under the second luminance node adjacent to the first luminance node in a frame is less than that of the first pulse; and the off level width of the first pulse of the luminous control signal under the plurality of second luminance nodes in a frame increases with the decrease of the luminance level.

[0196] Specifically, the width of the first pulse of the luminous control signal under the first luminance node in a frame decreases to improve the SVM index, but the luminance inversion problem occurs at the first luminance node DBV1. In the embodiment, as shown in FIG. 1, the off level width of the first pulse of the luminous control signal under all the luminance nodes with luminance levels greater than the first luminance node DBV1 in a frame is less than that of the first pulse, so that the width of the first pulse of the luminous control signal presents a one-way increasing trend with the decrease of the luminance level, and the luminance inversion problem is avoided. Figure 6

[0197] Optionally, the off level width of the first pulse of the luminous control signal under the plurality of second luminance nodes in a frame non-linearly increases with the decrease of the luminance level.

[0198] ​Optionally, the absolute value of the ratio of the difference between the off level width of the first pulse of the light emitting control signal under the k+1th second brightness node and the off level width of the first pulse of the light emitting control signal under the kth second brightness node and the difference between the brightness level of the kth second brightness node and the k+1th second brightness node is different from the absolute value of the ratio of the difference between the off level width of the first pulse of the light emitting control signal under the kth second brightness node and the off level width of the first pulse of the light emitting control signal under the k-1th second brightness node and the difference between the brightness level of the k-1th second brightness node and the kth second brightness node; wherein the brightness level of the kth second brightness node is greater than the brightness level of the k+1th second brightness node; k is an integer greater than or equal to 2.

[0199] Optionally, the absolute value of the ratio of the difference between the off level width of the first pulse of the light emitting control signal under the k+1th second brightness node and the off level width of the first pulse of the light emitting control signal under the kth second brightness node and the difference between the brightness level of the kth second brightness node and the k+1th second brightness node is greater than or equal to the absolute value of the ratio of the difference between the off level width of the first pulse of the light emitting control signal under the kth second brightness node and the off level width of the first pulse of the light emitting control signal under the k-1th second brightness node and the difference between the brightness level of the k-1th second brightness node and the kth second brightness node.

[0200] Optionally, the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse is T1+Δt1 / M; T1 is greater than zero, and Δt1 is greater than zero; T1-Δt1 is greater than zero.

[0201] Optionally, M is an integer greater than or equal to 2.

[0202] Optionally, M is equal to 3.

[0203] Optionally, the number of pulses of the light emitting control signal under the first brightness node in a frame is the same as the number of pulses of the light emitting control signal under the first brightness node in a frame.

[0204] The off level width of the first pulse of the light emitting control signal under the first brightness node in a frame is less than the off level width of the first pulse.

[0205] Optionally, a difference between a first pulse of the light emitting control signal under the k+1th second brightness node and an off level width of a first pulse of the light emitting control signal under the kth second brightness node in a frame, and a difference between the brightness level of the kth second brightness node and the k+1th second brightness node, is greater than or equal to a difference between a first pulse of the light emitting control signal under the kth second brightness node and a first pulse of the light emitting control signal under the k-1th second brightness node in a frame, and a difference between the brightness level of the k-1th second brightness node and the kth second brightness node; wherein the brightness level of the kth brightness node is greater than the brightness level of the k+1th second brightness node.

[0206] Optionally, the light emitting control signal under the second brightness node includes N second pulse groups in a frame; the second pulse group includes a third pulse and M fourth pulses after the third pulse; the off level width of the third pulse in different second pulse groups in a frame is the same.

[0207] Optionally, the off level width of the third pulse in the same second pulse group is smaller than the off level width of the fourth pulse.

[0208] Optionally, in the same second pulse group, the off level width of the third pulse under the light emitting control signal under the kth second brightness node in a frame is T2 k -Δt2 k , the total off level width of the M fourth pulses is M*T2 k +Δt2 k -Δt3 k , T2 k is greater than zero, Δt2 k is greater than zero, Δt3 k is greater than zero.

[0209] Optionally, N*(M+1)*T2 corresponding to the plurality of second brightness nodes linearly increases with the decrease of the brightness level of the second brightness node.

[0210] Optionally, in the same second pulse group corresponding to the kth second brightness node, the off level width of one fourth pulse of the M fourth pulses is T2 k +Δt2 k / M-Δt3 k , and the off level width of the other fourth pulses is T2 k +Δt2 k / M.

[0211] The embodiment can be combined with part or all of the features in the above-mentioned embodiments, which will not be described herein.

[0212] The application further provides a driving module, such asFigure 13 As shown, Figure 13 A structural diagram of a driving module is provided in the embodiment of the present application. The driving module 80 is used to output a light emitting control signal. The light emitting control signal under a first brightness node includes N first pulse groups in a frame, N is an integer greater than or equal to 1; the first pulse group includes one first pulse and M second pulses after the first pulse, M is an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse is T1+Δt1 / M; T1 is greater than zero, and Δt1 is greater than zero; the brightness level is greater than the brightness level of the first brightness node, and the off level width of the first pulse of the light emitting control signal under the brightness node adjacent to the first brightness node in the frame is less than the off level width of the first pulse.

[0213] Specifically, the driving module includes a driving chip for example. The specific working principle of the driving module can refer to the description of the light adjusting method of the display panel in the embodiment of the present application, which will not be described here. The driving module of the embodiment can improve the brightness inversion problem of the display panel.

[0214] The embodiment can be combined with part or all of the features in the above-mentioned embodiments, which will not be described here.

[0215] The present application also provides a display device, Figure 14 A structural diagram of a display device is provided in the embodiment of the present application, which is described with reference to Figure 14 The display device includes a display panel and a driving module, and the driving module is used to output a light emitting control signal to the display panel. The light emitting control signal under a first brightness node includes N first pulse groups in a frame, N is an integer greater than or equal to 1; the first pulse group includes one first pulse and M second pulses after the first pulse, M is an integer greater than or equal to 1; the off level width of the first pulse is T1-Δt1, and the off level width of the second pulse is T1+Δt1 / M; T1 is greater than zero, and Δt1 is greater than zero; the brightness level is greater than the brightness level of the first brightness node, and the off level width of the first pulse of the light emitting control signal under the brightness node adjacent to the first brightness node in the frame is less than the off level width of the first pulse.

[0216] Specifically, the specific working process of the display device can refer to the description of the light adjusting method of the display panel in the present application, which will not be repeated here. The display device can be a mobile phone, a tablet computer, an MP3, an MP4, a smart watch, a smart helmet, or other wearable devices, etc. The display device includes the driving module provided by the embodiments of the present application, and thus has the same beneficial effects, which will not be repeated here. The display device such as a mobile phone and a computer usually includes a brightness adjustment button, and a user changes the input display brightness value (DBV) through the brightness adjustment button, that is, switches the brightness node. Under different DBV, the brightness corresponding to the same gray scale is different. For example, the larger the DBV, the larger the brightness corresponding to the maximum gray scale. The driving module can be used to output a light emitting control signal to the input end of the light emitting control signal generation circuit of the display panel, and the output end of the light emitting control signal generation circuit outputs the light emitting control signal with a delay to the pixel circuit. Alternatively, the driving module can include a light emitting control signal generation circuit. Alternatively, the driving module can include a chip and a light emitting control signal generation circuit.

[0217] The present embodiment can be combined with some or all of the features of the above-mentioned embodiments, which will not be repeated here.

[0218] It should be understood that the various forms of flow shown above can be reordered, added, or deleted steps. For example, each step described in the present application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0219] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A dimming method for a display panel, characterized in that, The display panel includes a first brightness node; the dimming method includes: The light emission control signal under the first brightness node includes N first pulse groups in one frame, where N is an integer greater than or equal to 1; the first pulse group includes 1 first pulse and M second pulses located after the first pulse, where M is an integer greater than or equal to 1; the extinguishing level width of the first pulse is T1-Δt1, where T1 is a first set value and Δt1 is a first adjustment value; the extinguishing level width of the second pulse is T1+Δt1 / M; T1 is greater than zero, Δt1 is greater than zero; T1-Δt1 is greater than zero; The brightness level of the display panel is greater than the brightness level of the first brightness node, and the light emission control signal under the brightness node adjacent to the first brightness node has a smaller extinguishing level width of the first pulse in a frame than the extinguishing level width of the first pulse. The display panel includes multiple second brightness nodes, and the brightness level of the second brightness node is greater than the brightness level of the first brightness node. The extinguishing level width of the first pulse of the luminance control signal under the second luminance node adjacent to the first luminance node within a frame is smaller than the extinguishing level width of the first pulse.

2. The dimming method for a display panel according to claim 1, characterized in that, Under multiple second brightness nodes, the extinguishing level width of the first pulse of the light emission control signal within a frame increases as the brightness level decreases.

3. The dimming method for a display panel according to claim 1, characterized in that, Under multiple second brightness nodes, the illumination level width of the first pulse of the light emission control signal within a frame decreases as the brightness level decreases.

4. The dimming method for a display panel according to claim 1, characterized in that, The absolute value of the ratio of the difference in the extinguishing level width of the first pulse of the light emission control signal under the (k+1)th second brightness node within a frame to the difference in brightness level between the kth and (k+1)th second brightness nodes is different from the absolute value of the ratio of the difference in extinguishing level width of the first pulse of the light emission control signal under the kth and (k-1)th second brightness nodes within a frame to the difference in brightness level between the (k-1)th and kth second brightness nodes; wherein, the brightness level of the kth second brightness node is greater than the brightness level of the (k+1)th second brightness node; k is an integer greater than or equal to 2; And / or, the absolute value of the ratio of the difference in the extinguishing level width of the first pulse of the light emission control signal under the (k+1)th second brightness node within a frame and the difference in brightness level between the kth and (k+1)th second brightness nodes is greater than or equal to the absolute value of the ratio of the difference in the extinguishing level width of the first pulse of the light emission control signal under the kth second brightness node within a frame and the difference in brightness level between the (k-1)th and kth second brightness nodes.

5. The dimming method for a display panel according to claim 1, characterized in that, The light emission control signal under the second brightness node includes N second pulse groups in one frame; the second pulse group includes a third pulse and M fourth pulses located after the third pulse; the extinguishing level width of the third pulse in different second pulse groups in one frame is the same.

6. The dimming method for a display panel according to claim 5, characterized in that, Within a frame, the extinguishing level width of the fourth pulse in the same second pulse group is the same.

7. The dimming method for a display panel according to claim 6, characterized in that, Within a frame, the extinguishing level width of the fourth pulse in different second pulse groups is the same; within a frame, the extinguishing level width of the third pulse under the k-th second brightness node in the same second pulse group is T2. k -Δt2 k The extinguishing level width of the fourth pulse is T2. k +Δt2 k / M;T2 k The second set value, Δt2 k The second adjustment value, T2 k Greater than zero, Δt2 k Greater than zero; T2 k -Δt2 k Greater than zero.

8. The dimming method for a display panel according to claim 7, characterized in that, T2 k The ratio is the sum of the extinguishing level widths of the third pulse and M fourth pulses in the same second pulse group of the light emission control signal under the kth second brightness node, divided by the number of pulses in the second pulse group.

9. The dimming method for a display panel according to claim 5, characterized in that, Within a frame, at least two of the fourth pulses in the same second pulse group have different extinguishing level widths.

10. The dimming method for a display panel according to claim 9, characterized in that, Within one frame, in the same second pulse group, the extinguishing level width of the third pulse under the emission control signal of the kth second brightness node is T2. k -Δt2 k The total width of the extinguishing level of the M fourth pulses is M. T2 k +Δt2 k -Δt3 k T2 k The second set value, Δt2 k The second adjustment value is Δt3. k The third adjustment value, T2 k Greater than zero, Δt2 k Greater than zero, Δt3 k Greater than zero; T2 k -Δt2 k Greater than zero.

11. The dimming method for a display panel according to claim 6 or 9, characterized in that, Within a frame, the extinguishing level width of the fourth pulse in the same second pulse group is different from the extinguishing level width of at least one of the third pulses.

12. The dimming method for a display panel according to claim 7 or 10, characterized in that, N corresponding to multiple second brightness nodes (M+1) T2 increases as the brightness level of the second brightness node decreases.

13. The dimming method for a display panel according to claim 12, characterized in that, N corresponding to multiple second brightness nodes (M+1) T2 increases linearly as the brightness level of the second brightness node decreases.

14. The dimming method for a display panel according to claim 13, characterized in that, N corresponding to the (k+1)th second brightness node (M+1) T2 k+1 N corresponding to the kth second brightness node (M+1) T2 k The absolute value of the ratio of the difference between the second brightness nodes is equal to the difference between the brightness levels of the kth second brightness node and the (k+1)th second brightness node, and is equal to the N corresponding to the kth second brightness node. (M+1) T2 k N corresponding to the (k-1)th second brightness node (M+1) T2 k-1 The absolute value of the ratio of the difference between the (k-1)th and (k-1)th second luminance nodes to the difference between the luminance levels of the kth second luminance node.

15. The dimming method for a display panel according to claim 10, characterized in that, In the same second pulse group corresponding to the kth second brightness node, the extinguishing level width of one of the M fourth pulses is T2. k +Δt2 k / M-Δt3 k The extinguishing level width of the other fourth pulse is T2. k +Δt2 k / M.

16. The dimming method for a display panel according to claim 15, characterized in that, M is an integer greater than or equal to 2.

17. The dimming method for a display panel according to claim 16, characterized in that, M equals 3.

18. The dimming method for a display panel according to claim 15, characterized in that, Δt3 corresponding to the kth second brightness node k Δt3 is greater than or equal to the Δt3 corresponding to the (k+1)th second brightness node. k+1 .

19. The dimming method for a display panel according to claim 10, characterized in that, In the same second pulse group corresponding to the kth second brightness node, the extinguishing level width of v fourth pulses out of the M fourth pulses is T2. k +Δt2 k / M-Δt3 k / v, where v is an integer greater than or equal to 1, and v is less than or equal to M.

20. The dimming method for a display panel according to claim 19, characterized in that, v is an integer greater than or equal to 2.

21. The dimming method for a display panel according to claim 10, characterized in that, In the same second pulse group corresponding to the kth second brightness node, the extinguishing level width of at least one fourth pulse is T2. k +Δt2 k / M.

22. The dimming method for a display panel according to claim 6 or 9, characterized in that, The display panel includes a plurality of third brightness nodes, and at least one third brightness node is disposed between two adjacent second brightness nodes; The light emission control signal under the third brightness node includes N third pulse groups in one frame; the third pulse group includes a fifth pulse and M sixth pulses located after the fifth pulse; N is an integer greater than or equal to 2; the extinguishing level width of the fifth pulse in different third pulse groups is the same in one frame; The luminance control signal located between the kth second luminance node and the (k+1)th second luminance node has the same extinguishing level width of the fifth pulse within a frame as the extinguishing level width of the third pulse of the luminance control signal of the kth second luminance node within a frame; wherein the luminance level of the kth second luminance node is greater than the luminance level of the (k+1)th second luminance node.

23. The dimming method for a display panel according to claim 6 or 9, characterized in that, The display panel includes a plurality of third brightness nodes, and a plurality of third brightness nodes are disposed between two adjacent second brightness nodes; The light emission control signal under the third brightness node includes N third pulse groups in one frame; the third pulse group includes a fifth pulse and M sixth pulses located after the fifth pulse; N is an integer greater than or equal to 2; the extinguishing level width of the fifth pulse in different third pulse groups is the same in one frame; The light emission control signal located at the i-th third brightness node between the k-th and (k+1)-th second brightness nodes, within one frame, has a total extinguishing level width of N for all the sixth pulses in the N third pulse groups. (M) T2 k +Δt2 k )+i ΔH–N Δt3 k（i） , where Δt3 k（i） Greater than or equal to 0 and less than Δt3 k Δt3 k（i） It decreases as i increases, or, Δt3 k（i） As i increases, the value first decreases and then remains constant. ΔH is the fourth adjustment value, and ΔH is greater than 0. Among them, the brightness level of the kth second brightness node is greater than the brightness level of the (k+1)th second brightness node. i is an integer greater than or equal to 1.

24. The dimming method for a display panel according to claim 23, characterized in that, ΔH is a fixed constant.

25. The dimming method for a display panel according to claim 23, characterized in that, Δt3 k（i） As i increases, it first decreases and then becomes 0.

26. The dimming method for a display panel according to claim 23, characterized in that, The Δt3 corresponding to one or more of the third brightness nodes located between the k-th and (k+1)-th second brightness nodes and adjacent to the (k+1)-th second brightness node. k（i） It equals 0.

27. The dimming method for a display panel according to claim 23, characterized in that, In at least a portion of the third luminance nodes, the emission control signals of two adjacent third luminance nodes exist in N pairs or v within a frame. The extinguishing level width of the sixth pulse corresponding to position N+1 is different; v is an integer greater than or equal to 1 and less than or equal to M.

28. The dimming method for a display panel according to claim 23, characterized in that, Among the multiple third brightness nodes located between the kth second brightness node and the (k+1)th second brightness node, the extinguishing level width of the first sixth pulse of the first third pulse group of the light emission control signal under the first third brightness node within a frame is greater than the extinguishing level width of the first fourth pulse of the light emission control signal under the kth second brightness node.

29. The dimming method for a display panel according to claim 23, characterized in that, When i is greater than or equal to 2 and less than or equal to N, the extinguishing level width of the first sixth pulse of the first third pulse group of the light emission control signal under the i-th third brightness node in a frame is greater than the extinguishing level width of the first sixth pulse of the first third pulse group of the light emission control signal under the (i-1)-th third brightness node in a frame.

30. The dimming method for a display panel according to claim 23, characterized in that, i is greater than or equal to (w-1) N+1, and less than or equal to w When N, the emission control signal under the i-th third brightness node is at the i-(w-1)th position within a frame. The extinguishing level width of the w-th sixth pulse in the N third pulse groups is greater than the luminance control signal under the (i-1)-th third brightness node within a frame at the (i-(w-1)th)th pulse. The extinguishing level width of the w-th sixth pulse in the N-th third pulse group; w is greater than or equal to 2 and less than or equal to M.

31. The dimming method for a display panel according to claim 28, characterized in that, Among the multiple third brightness nodes located between the k-th and (k+1)-th second brightness nodes, the extinguishing level width of the first sixth pulse of the first third pulse group of the emission control signal under the first third brightness node within a frame is greater than the extinguishing level width of the first fourth pulse of the emission control signal under the k-th second brightness node by ΔH; or, the difference between the extinguishing level width of the first sixth pulse of the first third pulse group of the emission control signal under the first third brightness node and the extinguishing level width of the first fourth pulse of the emission control signal under the k-th second brightness node within a frame is greater than or equal to ΔH - Δt3. k（1） .

32. The dimming method for a display panel according to claim 29, characterized in that, When i is greater than or equal to 2 and less than or equal to N, the extinguishing level width of the first sixth pulse of the first third pulse group in a frame of the light emission control signal under the i-th third brightness node is greater than ΔH than the extinguishing level width of the first sixth pulse of the first third pulse group in a frame of the light emission control signal under the (i-1)-th third brightness node, or the difference between the extinguishing level width of the first sixth pulse of the first third pulse group in a frame of the light emission control signal under the i-th third brightness node and the extinguishing level width of the first sixth pulse of the first third pulse group in a frame of the light emission control signal under the (i-1)-th third brightness node is greater than or equal to ΔH + (Δt3) / 2. k（i-1） -Δt3 k（i） ).

33. The dimming method for a display panel according to claim 30, characterized in that, i is greater than or equal to (w-1) N+1, and less than or equal to w When N, the emission control signal under the i-th third brightness node is at the i-(w-1)th position within a frame. The extinguishing level width of the w-th sixth pulse in the N third pulse groups is greater than that of the emission control signal at the (i-1)-th third brightness node within a frame at the (i-(w-1)th)-th third brightness node. The extinguishing level width of the w-th sixth pulse in the N third pulse groups is greater than ΔH, or the luminescence control signal under the i-th third brightness node is i-(w-1)th within a frame. The extinguishing level width of the w-th sixth pulse of the N third pulse groups minus the emission control signal at the (i-1)-th third brightness node within a frame at the (i-(w-1)th)th pulse... The difference in the extinguishing level width of the w-th sixth pulse of the N third pulse groups is greater than or equal to ΔH + (Δt3) k（i-1） -Δt3 k（i） w is greater than or equal to 2 and less than or equal to M.

34. The dimming method for a display panel according to claim 1, characterized in that, The display panel also includes multiple fourth brightness nodes, the brightness level of which is greater than the brightness level of the second brightness node; The light emission control signal under the fourth brightness node includes N fourth pulse groups within one frame; the fourth pulse group includes M+1 seventh pulses.

35. The dimming method for a display panel according to claim 34, characterized in that, The total width of the extinguishing level of the multiple light emission control signals under the fourth brightness nodes within a frame increases as the brightness level of the fourth brightness node decreases.

36. The dimming method for a display panel according to claim 35, characterized in that, The total width of the extinguishing level of the multiple light emission control signals under the fourth brightness nodes within a frame increases linearly as the brightness level of the fourth brightness node decreases.

37. The dimming method for a display panel according to claim 36, characterized in that, The absolute value of the ratio of the difference between the extinguishing level width of the light emission control signal under the (p+1)th fourth brightness node and the extinguishing level width of the light emission control signal under the pth fourth brightness node within a frame, to the difference in brightness level between the pth and (p+1)th fourth brightness nodes, is equal to the absolute value of the ratio of the difference between the extinguishing level width of the light emission control signal under the pth fourth brightness node and the extinguishing level width of the light emission control signal under the (p-1)th fourth brightness node within a frame, to the difference in brightness level between the (p-1)th and pth fourth brightness nodes; where the brightness level of the pth fourth brightness node is greater than the brightness level of the (p+1)th fourth brightness node; and p is an integer greater than or equal to 2.

38. The dimming method for a display panel according to claim 34, characterized in that, In the same fourth pulse group, the extinguishing level width of the first seventh pulse is greater than or equal to the extinguishing level width of the remaining seventh pulses.

39. The dimming method for a display panel according to claim 34, characterized in that, The display panel includes a plurality of fifth brightness nodes, and a plurality of fifth brightness nodes are provided between two adjacent fourth brightness nodes; The total width of the extinguishing level of the multiple fifth brightness nodes between two adjacent fourth brightness nodes increases as the brightness level of the fifth brightness node decreases within a frame.

40. The dimming method for a display panel according to claim 39, characterized in that, The total width of the extinguishing level of the multiple fifth brightness nodes between two adjacent fourth brightness nodes increases linearly with the decrease of the brightness level of the fifth brightness node within a frame.

41. The dimming method for a display panel according to claim 40, characterized in that, Among the multiple fifth brightness nodes between two adjacent fourth brightness nodes, the absolute value of the ratio of the difference between the extinguishing level width of the light emission control signal under the (j+1)th fifth brightness node and the extinguishing level width of the light emission control signal under the jth fifth brightness node within a frame, to the difference in brightness level between the jth and (j+1)th fifth brightness nodes, is equal to the absolute value of the ratio of the difference between the extinguishing level width of the light emission control signal under the jth fifth brightness node and the extinguishing level width of the light emission control signal under the (j-1)th fifth brightness node within a frame, to the difference in brightness level between the (j-1)th and jth fifth brightness nodes; wherein, the brightness level of the jth fifth brightness node is greater than the brightness level of the (j+1)th fifth brightness node; j is an integer greater than or equal to 2.

42. The dimming method for a display panel according to claim 39, characterized in that, The light emission control signal under the fifth brightness node includes N fifth pulse groups within one frame; the fifth pulse group includes M+1 eighth pulses, and the light emission control signals of two adjacent fifth brightness nodes have only one pair of eighth pulses with different extinguishing level widths within one frame. Among multiple fifth brightness nodes between two adjacent fourth brightness nodes, when j is greater than or equal to 1 and less than or equal to N, the extinguishing level width of the first eighth pulse of the first j fifth pulse groups of the emission control signal under the j-th fifth brightness node within a frame is greater than the extinguishing level width of the seventh pulse of the emission control signal under the fourth brightness node with the larger brightness level among the two adjacent fourth brightness nodes by a fifth adjustment value; j is greater than or equal to (q-1). When N+1, and less than or equal to qN, the emission control signal under the j-th fifth brightness node is the first q-1 eighth pulses and the first j-(q-1) of the N fifth pulse groups within a frame. The extinguishing level width of the qth eighth pulse in each of the N fifth pulse groups is greater than the extinguishing level width of the seventh pulse of the light emission control signal under the fourth brightness node with the larger brightness level among the two adjacent fourth brightness nodes by a fifth adjustment value; q is greater than or equal to 2 and less than or equal to M; the fifth adjustment value is greater than 0.

43. The dimming method for a display panel according to claim 42, characterized in that, The fifth adjustment value is a fixed constant greater than 0.

44. The dimming method for a display panel according to claim 42, characterized in that, The light emission control signals corresponding to the j-th fifth brightness node and the (j-1)-th fifth brightness node within one frame have different extinguishing level widths in the b-th eighth pulse of the a-th eighth pulse group; wherein, when j is not an integer multiple of N, a is the remainder of j / N and b is the quotient of (j+N) / N; when j is an integer multiple of N, a is N, b is j / N, and j is greater than or equal to 2.

45. The dimming method for a display panel according to claim 1, characterized in that, There are multiple first brightness nodes, and the brightness levels of the multiple first brightness nodes decrease sequentially. The light emission control signals under the multiple first brightness nodes are the same. Alternatively, the display panel may include at least one sixth brightness node. The brightness level of the sixth brightness node is lower than that of the first brightness node, and the light emission control signal under the sixth brightness node is the same as that under the first brightness node.

46. ​​The dimming method for a display panel according to claim 1, characterized in that, N is an integer greater than or equal to 2; And / or, M is an integer greater than or equal to 2; And / or, at the same gray level or the maximum gray level, the larger the brightness level of the brightness node, the greater the corresponding brightness; And / or, the display panel includes a pixel circuit, wherein the data writing phase of the pixel circuit overlaps with the time period of the extinguishing level of the first pulse of the light emission control signal connected to the pixel circuit within a frame; And / or, T1 is the ratio of the sum of the extinguishing level widths of the first pulse and M second pulses in the same first pulse group to the number of pulses in the first pulse group.

47. A dimming method for a display panel, characterized in that, The display panel includes a first brightness node and multiple second brightness nodes, wherein the brightness level of the second brightness nodes is greater than the brightness level of the first brightness nodes; the dimming method includes: The light emission control signal under the first brightness node includes N first pulse groups in one frame, where N is an integer greater than or equal to 1; the first pulse group includes 1 first pulse and M second pulses located after the first pulse, where M is an integer greater than or equal to 1; the extinguishing level width of the first pulse is less than the extinguishing level width of the second pulse. The extinguishing level width of the first pulse of the luminance control signal under the second luminance node adjacent to the first luminance node is smaller than the extinguishing level width of the first pulse within a frame. Under multiple second brightness nodes, the extinguishing level width of the first pulse of the light emission control signal within a frame increases as the brightness level decreases.

48. The dimming method for a display panel according to claim 47, characterized in that, Under multiple second brightness nodes, the extinguishing level width of the first pulse of the light emission control signal within a frame increases nonlinearly as the brightness level decreases; And / or, the absolute value of the ratio of the difference in the extinguishing level width of the first pulse of the emission control signal under the (k+1)th second brightness node within a frame and the difference in brightness level between the kth and (k+1)th second brightness nodes is different from the absolute value of the ratio of the difference in extinguishing level width of the first pulse of the emission control signal under the kth second brightness node within a frame and the difference in brightness level between the (k-1)th and kth second brightness nodes; wherein, the brightness level of the kth second brightness node is greater than the brightness level of the (k+1)th second brightness node; k is an integer greater than or equal to 2; And / or, the absolute value of the ratio of the difference in the extinguishing level width of the first pulse of the light emission control signal under the (k+1)th second brightness node within a frame and the difference in brightness level between the kth and (k+1)th second brightness nodes is greater than or equal to the absolute value of the ratio of the difference in the extinguishing level width of the first pulse of the light emission control signal under the kth second brightness node within a frame and the difference in brightness level between the (k-1)th and kth second brightness nodes.

49. The dimming method for a display panel according to claim 47, characterized in that, The extinguishing level width of the first pulse is T1-Δt1, and the extinguishing level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, and Δt1 is greater than zero; T1-Δt1 is greater than zero, where T1 is the ratio of the sum of the extinguishing level widths of the first pulse and M second pulses in the same first pulse group to the number of pulses in the first pulse group.

50. The dimming method for a display panel according to claim 49, characterized in that, M is an integer greater than or equal to 2.

51. The dimming method for a display panel according to claim 50, characterized in that, M equals 3.

52. The dimming method for a display panel according to claim 49, characterized in that, The brightness level of the display panel is greater than the light emission control signal under the brightness node of the first brightness node, and the number of pulses in one frame is the same as the number of pulses of the light emission control signal under the first brightness node in one frame. The brightness level of the display panel is greater than the light emission control signal under the brightness node of the first brightness node, and the extinguishing level width of the first pulse in a frame is less than the extinguishing level width of the first pulse.

53. The dimming method for a display panel according to claim 49, characterized in that, The ratio of the difference in the extinguishing level width between the first pulse of the emission control signal under the (k+1)th second brightness node and the first pulse of the emission control signal under the kth second brightness node within a frame to the difference in brightness level between the kth and (k+1)th second brightness nodes is greater than or equal to the ratio of the difference in the extinguishing level width between the first pulse of the emission control signal under the kth second brightness node and the first pulse of the emission control signal under the (k-1)th second brightness node within a frame to the difference in brightness level between the (k-1)th and kth second brightness nodes; wherein, the brightness level of the kth brightness node is greater than the brightness level of the (k+1)th second brightness node.

54. The dimming method for a display panel according to claim 53, characterized in that, The light emission control signal under the second brightness node includes N second pulse groups in one frame; the second pulse group includes a third pulse and M fourth pulses located after the third pulse; the extinguishing level width of the third pulse in different second pulse groups in one frame is the same.

55. The dimming method for a display panel according to claim 54, characterized in that, The extinguishing level width of the third pulse in the same second pulse group is less than that of the fourth pulse.

56. The dimming method for a display panel according to claim 55, characterized in that, Within one frame, in the same second pulse group, the extinguishing level width of the third pulse under the emission control signal of the kth second brightness node is T2. k -Δt2 k The total width of the extinguishing level of the M fourth pulses is M. T2 k +Δt2 k -Δt3 k T2 k Greater than zero, Δt2 k Greater than zero, Δt3 k Greater than zero.

57. The dimming method for a display panel according to claim 56, characterized in that, N corresponding to multiple second brightness nodes (M+1) T2 increases linearly as the brightness level of the second brightness node decreases.

58. The dimming method for a display panel according to claim 56, characterized in that, In the same second pulse group corresponding to the kth second brightness node, the extinguishing level width of one of the M fourth pulses is T2. k +Δt2 k / M-Δt3 k The extinguishing level width of the other fourth pulse is T2. k +Δt2 k / M.

59. A driving module, characterized in that, The driving module is used to output light emission control signals. The light emission control signal under the first brightness node includes N first pulse groups in one frame, where N is an integer greater than or equal to 1; the first pulse group includes 1 first pulse and M second pulses following the first pulse, where M is an integer greater than or equal to 1; the extinguishing level width of the first pulse is T1-Δt1, and the extinguishing level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, Δt1 is greater than zero, and T1-Δt1 is greater than zero; The brightness level of the light emission control signal of the brightness node adjacent to the first brightness node is greater than the brightness level of the first brightness node, and the extinguishing level width of the first pulse in a frame is less than the extinguishing level width of the first pulse. The display panel includes multiple second brightness nodes, the brightness level of the second brightness node being greater than the brightness level of the first brightness node; The extinguishing level width of the first pulse of the luminance control signal under the second luminance node adjacent to the first luminance node within a frame is smaller than the extinguishing level width of the first pulse.

60. A display device, characterized in that, It includes a display panel and a driving module, wherein the driving module is used to output light emission control signals to the display panel. The light emission control signal under the first brightness node includes N first pulse groups in one frame, where N is an integer greater than or equal to 1; the first pulse group includes 1 first pulse and M second pulses located after the first pulse, where M is an integer greater than or equal to 1; the extinguishing level width of the first pulse is T1-Δt1, and the extinguishing level width of the second pulse is T1+Δt1 / M; T1 is a first set value, Δt1 is a first adjustment value, T1 is greater than zero, Δt1 is greater than zero, and T1-Δt1 is greater than zero; the light emission control signal under the brightness node whose brightness level is greater than the brightness level of the first brightness node and is adjacent to the first brightness node has a extinguishing level width of the first pulse in one frame that is less than the extinguishing level width of the first pulse; The display panel includes multiple second brightness nodes, the brightness level of the second brightness node being greater than the brightness level of the first brightness node; The extinguishing level width of the first pulse of the luminance control signal under the second luminance node adjacent to the first luminance node within a frame is smaller than the extinguishing level width of the first pulse.

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