Display control method, display panel and storage medium

Abstract

The invention provides a display control method, a display panel and a storage medium, and belongs to the technical field of display. The method comprises the steps of obtaining a target brightness value currently displayed by a display panel; when the target brightness value is smaller than a preset brightness threshold value, determining a first pulse width of a first pulse and a second pulse width of a second pulse of the light-emitting control signal in an output stage according to the target brightness value; the output time sequence of the first pulse is at least before the output time sequence of one second pulse, and the first pulse width is greater than the second pulse width; in at least one output stage, the first pulse of the light-emitting control signal is controlled to be output according to the first pulse width, and the second pulse of the light-emitting control signal is controlled to be output according to the second pulse width.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a display control method, a display panel and a storage medium. Background Art

[0002] With the development of display technology, users have put forward higher technical requirements for the flicker of display products. The original flicker evaluation index cannot accurately evaluate the flicker level. In order to better measure the flicker situation, the stroboscopic visibility measure (SVM) is now used to evaluate the flicker level of display products. SVM is a technology used to evaluate the fluctuation of light. The lower the SVM value, the less flicker damage the display product will suffer. Summary of the invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provides a display control method, a display panel and a storage medium.

[0004] In the first aspect, the technical solution adopted to solve the technical problem of the present disclosure is a display control method, comprising:

[0005] Get the target brightness value currently displayed by the display panel;

[0006] When the target brightness value is less than a preset brightness threshold, determining a first pulse width of a first pulse and a second pulse width of a second pulse of a light emitting control signal in an output stage according to the target brightness value; an output timing of the first pulse is at least before an output timing of one of the second pulses, and the first pulse width is greater than the second pulse width;

[0007] In at least one of the output stages, the first pulse of the light emitting control signal is controlled to be output according to the first pulse width, and the second pulse of the light emitting control signal is controlled to be output according to the second pulse width.

[0008] In some embodiments, the light emitting control signal includes a first pulse and at least one second pulse;

[0009] The first pulse is the first valid pulse of the light-emitting control signal in the output stage; the second pulse is a non-first valid pulse of the light-emitting control signal in the output stage.

[0010] In some embodiments, the light emitting control signal includes a first pulse and at least two second pulses;

[0011] The first pulse is the second valid pulse of the light emitting control signal in the output stage; the second pulse is the remaining valid pulses of the light emitting control signal except the second valid pulse in the output stage.

[0012] In some embodiments, determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emitting control signal in the output stage according to the target brightness value includes:

[0013] Determining an initial pulse width of the first pulse and an initial pulse width of the second pulse corresponding to the target brightness value according to a preset first association relationship between display brightness values ​​and respective pulse widths;

[0014] According to a preset first target pulse width difference, the initial pulse width of the first pulse and the initial pulse width of the second pulse are adjusted to obtain updated first pulse width and second pulse width.

[0015] In some embodiments, the display panel includes a plurality of rows of sub-pixels; the first target pulse width difference is between 4H and 48H; and H represents the time for the light emitting control signal to scan a row of sub-pixels.

[0016] In some embodiments, determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emitting control signal in the output stage according to the target brightness value includes:

[0017] According to the preset brightness interval in which the target brightness value is located, determining a second association relationship corresponding to the preset brightness interval; the second association relationship represents an association relationship between each display brightness value in the preset brightness interval and a first preset pulse width difference value; the preset brightness interval includes a first interval and a second interval; the display brightness value in the first interval is less than the display brightness value in the second interval; in the first interval, the first preset pulse width difference value is a fixed value; in the second interval, the first preset pulse width difference value is monotonically decreasing;

[0018] Determining a second target pulse width difference corresponding to the target brightness value according to the second association relationship;

[0019] Determining an initial pulse width of the first pulse and an initial pulse width of the second pulse corresponding to the target brightness value according to a preset first association relationship between display brightness values ​​and respective pulse widths;

[0020] According to the second target pulse width difference, the initial pulse width of the first pulse and the initial pulse width of the second pulse are adjusted to obtain updated first pulse width and second pulse width.

[0021] In some embodiments, the display brightness value in the first interval is 0 to 410; the display brightness value in the second interval is 410 to 1197;

[0022] Determining the second target pulse width difference corresponding to the target brightness value according to the second association relationship includes:

[0023] When the target brightness value is within the first interval, the second target pulse width difference is determined according to the second association relationship represented by the following expression 1; the expression 1: Y=p, p is any number between 35H and 45H; H represents the time for the light emitting control signal to scan a row of sub-pixels;

[0024] When the target brightness value is within the second interval, the second target pulse width difference is determined according to the second association relationship represented by the following expression 2: or Wherein, X represents the target brightness value, k is any number between -0.063 and -0.017, and u is any number between 43.67H and 81.07H. Indicates rounding up. represents rounding down, and Y represents the second target pulse width difference.

[0025] In some embodiments, the second interval includes a first sub-interval, a second sub-interval, a third sub-interval and a fourth sub-interval; the display brightness value in the first sub-interval is 410-580; the display brightness value in the second sub-interval is 580-700; the display brightness value in the third sub-interval is 700-910; the display brightness value in the fourth sub-interval is 910-1197;

[0026] Determining the second target pulse width difference corresponding to the target brightness value according to the second association relationship includes:

[0027] When the target brightness value is within the first sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 1: or

[0028] When the target brightness value is within the second sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 2: or

[0029] When the target brightness value is within the third sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 3: or

[0030] When the target brightness value is within the fourth sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 4: or

[0031] In some embodiments, the light emitting control signal comprises a plurality of second pulses in the output stage, and the second pulse widths of the second pulses are the same.

[0032] In some embodiments, the light emitting control signal includes a plurality of second pulses in the output stage, and the second pulse width of the second pulse with an earlier output timing is greater than the second pulse width of the second pulse with a later output timing.

[0033] In some embodiments, for any of the output stages, the second pulse width of the second pulse adjacent to the first pulse in the output timing is recorded as the first sub-pulse width, and the second pulse widths of the remaining second pulses are recorded as the second sub-pulse width;

[0034] Determining, according to the target brightness value, a first pulse width of a first pulse and a first sub-pulse width of a second pulse of the light emitting control signal in an output stage, comprising:

[0035] According to the preset brightness interval in which the target brightness value is located, determining a second association relationship corresponding to the preset brightness interval; the second association relationship represents an association relationship between each display brightness value in the preset brightness interval and a first preset pulse width difference value; the preset brightness interval includes a first interval and a second interval; the display brightness value in the first interval is less than the display brightness value in the second interval; in the first interval, the first preset pulse width difference value is a fixed value; in the second interval, the first preset pulse width difference value is monotonically decreasing;

[0036] Determining a second target pulse width difference corresponding to the target brightness value according to the second association relationship;

[0037] Determine, according to a preset first association relationship between display brightness values ​​and respective pulse widths, an initial pulse width of the first pulse corresponding to the target brightness value and an initial pulse width of a second pulse adjacent to the first pulse;

[0038] According to the second target pulse width difference, the initial pulse width of the first pulse and the initial pulse width of the second pulse adjacent to the first pulse are adjusted to obtain an updated first pulse width and a first sub-pulse width.

[0039] In some embodiments, the step of determining the second sub-pulse width of the remaining second pulse comprises:

[0040] According to the preset third target pulse width difference, the initial pulse width of the remaining second pulse is adjusted to obtain an updated second sub-pulse width.

[0041] In some embodiments, the display panel includes a plurality of rows of sub-pixels; the third target pulse width difference is between 4H and 20H; and H represents the time for the light emitting control signal to scan a row of sub-pixels.

[0042] In some embodiments, the step of determining the second sub-pulse width of the remaining second pulse comprises:

[0043] According to the determined second target pulse width difference, a fourth target pulse width difference between any two adjacent second pulses is determined; the fourth target pulse width difference is smaller than the second target pulse width difference;

[0044] According to the fourth target pulse width difference, the initial pulse width of the remaining second pulse is adjusted to obtain an updated second sub-pulse width.

[0045] In some embodiments, a fourth target pulse width difference between two adjacent second pulses whose output timing is earlier is greater than or equal to a fourth target pulse width difference between two adjacent second pulses whose output timing is later.

[0046] In some embodiments, the fourth target pulse width difference between two adjacent groups of the second pulses differs by 4H; H represents the time for the light emitting control signal to scan a row of sub-pixels;

[0047] The second target pulse width difference corresponding to the first pulse and the fourth target pulse width difference corresponding to the second pulse adjacent to the first pulse differ by 4H.

[0048] In some embodiments, the display control method further includes:

[0049] When the target brightness value is greater than or equal to the preset brightness threshold, determining a target duty cycle of the light control signal; the target duty cycle is between 89% and 97%;

[0050] For any of the output stages, the light emission control signal is controlled to be output according to the target duty cycle.

[0051] In some embodiments, the light emitting control signal includes three reset phases and three output phases in one frame timing; each of the output phases includes four output sub-phases, and one output sub-phase corresponds to one first pulse or one second pulse.

[0052] In a second aspect, an embodiment of the present disclosure further provides a display panel, which includes a driver and a scan drive circuit;

[0053] The driver is configured to obtain a target brightness value currently displayed by the display panel; when the target brightness value is less than a preset brightness threshold, determine a first pulse width of a first pulse and a second pulse width of a second pulse of a light emitting control signal in an output stage according to the target brightness value; the output timing of the first pulse is at least before the output timing of one of the second pulses, and the first pulse width is greater than the second pulse width;

[0054] The scan driving circuit is configured to control the first pulse of the light emitting control signal to be output according to the first pulse width, and control the second pulse of the light emitting control signal to be output according to the second pulse width in at least one of the output stages.

[0055] In a third aspect, an embodiment of the present disclosure further provides a computer non-volatile readable storage medium, wherein a computer program is stored on the computer non-volatile readable storage medium, and when the computer program is executed by a processor, the steps of the display control method described in any one of the first aspects are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A flow chart of a display control method provided by an embodiment of the present disclosure;

[0057] Figure 2 Example 1 provided for an embodiment of the present disclosure, a timing diagram in a first dimming mode;

[0058] Figure 3 A circuit diagram of a pixel circuit provided for an embodiment of the present disclosure;

[0059] Figure 4 Example 2 provided for an embodiment of the present disclosure, a timing diagram in a first dimming mode;

[0060] Figure 5 Example 1 provided for the embodiment of the present disclosure, a specific flow chart for determining the first pulse width and the second pulse width;

[0061] Figure 6 A schematic diagram showing a brightness change degree corresponding to a display brightness value provided by an embodiment of the present disclosure;

[0062] Figure 7 Example 2 provided for an embodiment of the present disclosure, a specific flow chart for determining a first pulse width and a second pulse width;

[0063] Figure 8 A schematic diagram of a linear expression of a second association relationship provided in an embodiment of the present disclosure;

[0064] Fig. 9 Example 3 provided for an embodiment of the present disclosure, a timing diagram in a first dimming mode;

[0065] Fig.10 Example 3 provided for the embodiment of the present disclosure, a specific flow chart for determining a first pulse width and a first sub-pulse width;

[0066] Fig.11 A specific flow chart for determining a second sub-pulse width in Example 3 provided in an embodiment of the present disclosure;

[0067] Fig.12 A schematic diagram showing another brightness change degree corresponding to a brightness value provided by an embodiment of the present disclosure;

[0068] Fig.13 Another specific flow chart for determining the second sub-pulse width in Example 3 provided in an embodiment of the present disclosure;

[0069] Fig.14 A timing diagram in a second dimming mode provided for an embodiment of the present disclosure;

[0070] Fig.15 A schematic diagram of a display panel provided in accordance with an embodiment of the present disclosure. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0072] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0073] The "multiple or several" mentioned in this disclosure refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0074] The transistor used in the embodiment of the present disclosure may be a thin film transistor or a field effect transistor or other devices with the same characteristics. Since the source and drain of the transistor used are symmetrical, there is no difference between the source and drain. In the embodiment of the present disclosure and the subsequent description, in order to distinguish the source and drain of the transistor, one of the electrodes is called the first electrode, the other electrode is called the second electrode, and the gate is called the control electrode. In addition, transistors can be divided into N-type and P-type according to the characteristics of the transistor. Among them, N-type thin film transistor refers to N-type ion doping in the active layer of the thin film transistor; P-type thin film transistor refers to P-type ion doping in the active layer of the thin film transistor. The working level signal of the N-type thin film transistor is a high level signal; the working level signal of the P-type thin film transistor is a low level signal.

[0075] Organic Light-Emitting Diode (OLED) display devices have many advantages such as self-luminescence and high contrast, and are a type of display device with broad application prospects. Low-temperature polycrystalline silicon oxide (LTPO) combines the high mobility of low-temperature polycrystalline silicon and the low leakage characteristics of oxide, which can achieve both high-frequency and low-frequency applications. Figure 3As shown, the second transistor is an LTPO transistor, and the current pixel circuit adopts 3P3H timing, which is a specific timing control method, mainly used to optimize the power consumption and refresh rate of OLED display screens. Among them, the "3P" in the 3P3H timing represents the three pre-charging stages of the pixel circuit, and the "3H" represents the three holding stages of the pixel circuit. By finely controlling the charging and retention of pixels, unnecessary power consumption is reduced, and the refresh rate and display quality of the screen are improved. Due to the 3P3H timing control, the light-emitting control signal will be reset 3 times in one frame, causing the display panel to produce 3 full black processes, which will cause the SVM objective value to be high. As shown in Table 1 below, the SVM value before improvement does not meet the SVM specification (SPEC) set by the user.

[0076] Table 1

[0077] Actual brightness (nit) SPET SVM value (before improvement) 500 ≤0.18 0.5 120 ≤0.26 0.6 30 ≤0.33 0.7 2 ≤1 1.9

[0078] In view of this, an embodiment of the present disclosure provides a display control method, which optimizes the pulse width of the output pulse of the light emitting control signal EM, and can verify that the SVM value satisfies the set SVM specification (SPEC).

[0079] The display control method provided by the embodiment of the present disclosure is applied to a display panel. Figure 1 A flow chart of a display control method provided by an embodiment of the present disclosure, such as Figure 1 As shown, steps S11 to S13 are included.

[0080] S11. Obtain the target brightness value currently displayed by the display panel.

[0081] Here, the target brightness value is the display brightness value (DBV) currently displayed by the display panel, that is, the DBV value. The display brightness range of the display panel is 0 to 4095, which is converted into a brightness parameter of 0 to 2550 nit.

[0082] S12. When the target brightness value is less than a preset brightness threshold, determine a first pulse width of a first pulse and a second pulse width of a second pulse of the light emitting control signal in an output stage according to the target brightness value.

[0083] It should be noted that the display panel may include two dimming modes, recorded as the first dimming mode and the second dimming mode. The pulse frequency of the light-emitting control signal EM is different in different dimming modes, that is, the number of pulses of the light-emitting control signal EM is different in different dimming modes. The frame time of different dimming modes is the same. Taking the 120Hz refresh rate as an example, the scanning time of one frame is about 8.333ms. Optionally, the first dimming mode is pulse width modulation (PWM) dimming, which realizes brightness adjustment of the light-emitting device OLED by adjusting the pulse width of the light-emitting control signal EM. The second dimming mode is direct current (DC) dimming, which controls the driving current of the light-emitting device OLED by adjusting the data voltage output by the driver, thereby realizing brightness adjustment.

[0084] In this step, when the target brightness value is less than the preset brightness threshold, the first dimming mode is started, and the first pulse width a of the first pulse 10 and the second pulse width b of the second pulse 20 of the light control signal EM in the output stage t1 are determined according to the target brightness value.

[0085] like Figure 2 As shown, the output stage t1 is the stage between two adjacent reset stages in the working sequence of the pixel circuit, and the pixel circuit is a driving circuit in the display panel for driving the light-emitting device OLED to emit light. Taking the light-emitting control signal EM as an example, the output stage t1 of the light-emitting control signal EM is the stage between two adjacent reset stages t2 in the working sequence of the light-emitting control signal EM. Here, the reset stage t2 refers to the pre-charging stage represented by "3P" and the holding stage represented by "3H" in the 3P3H sequence. Among them, as Figure 3As shown, "P" can also be understood as the first reset signal (Reset_P) used to reset the gate of the driving transistor T3 in the pixel circuit, and "H" can also be understood as the second reset signal (Reset_H) used to multiplex the source of the driving transistor T3 and the anode of the light-emitting device OLED in the pixel circuit. The light-emitting control signal EM refers to the signal used to drive the light-emitting control transistors T5 and T6 to turn on and off. The first reset signal (Reset_P) refers to the signal used to drive the first reset transistor T1 to turn on and off. The second reset signal (Reset_H) refers to the signal used to drive the second reset transistors T7 and T8 to turn on and off. The output stage t1 includes multiple output sub-stages, and a valid light-emitting control signal EM is output in each output sub-stage. The so-called "valid" light-emitting control signal EM refers to a signal that can turn on the light-emitting control transistors T5 and T6. Affected by the characteristics of the light-emitting control transistors, it may be a high level or a low level. The present disclosure takes the example that the light-emitting control transistors T5 and T6, the first reset transistor T1 and the second reset transistors T7 and T8 are all P-type transistors, that is, the valid signals are all low-level signals. Exemplarily, as Figure 2 As shown, one frame of working sequence includes three reset phases t2 (i.e., reset three times in one frame) and three output phases t1, each output phase t1 includes four output sub-phases, and one output sub-phase corresponds to one first pulse 10 or one second pulse 20. The first pulse 10 and the second pulse 20 in the output phase t1 are both valid pulses, that is, a valid light-emitting control signal EM is output.

[0086] Optionally, the output stage t1 includes at least one first pulse 10 and at least one second pulse 20. For example, Figure 2 As shown, the output stage t1 includes a first pulse 10 and three second pulses 20. The output timing of the first pulse 10 is at least before the output timing of one second pulse 20, and the first pulse width a is greater than the second pulse width b, that is, a>b. The pulse width is in units of the time for scanning one row of sub-pixels, where a can also represent the time for scanning a row of sub-pixels, and b represents the time for scanning b row of sub-pixels.

[0087] Taking the preset brightness threshold (DBV value) of 1198 as an example, as shown in Table 2, in the first dimming mode, each display brightness value DBV is set with a corresponding first pulse width a of the first pulse 10 and a second pulse width b of the second pulse 20, and under the same display brightness value DBV, the first pulse width a is greater than the second pulse width b. Exemplarily, some nodes in the display brightness range are selected as examples, such as N10 node (DBV=3), N9 node (DBV=240), N8 node (DBV=410), N7 node (DBV=580), 30nit corresponding node (DBV=720), N6 node (DBV=910) and N5 node (DBV=1197), the first pulse width a of the first pulse 10 is 36H, 36H, 48H, 68H, 96H, 136H and 232H respectively, and the second pulse width b of the second pulse 20 is 12H, 12H, 24H, 44H, 72H, 112H and 208H respectively, wherein H represents the time for the light emitting control signal EM to scan a row of sub-pixels. Optionally, the difference (ab) between the first pulse width a and the second pulse 20 corresponding to each display brightness value DBV is the same.

[0088] Table 2

[0089]

[0090] Exemplarily, when the target brightness value (DBV value) is 910, the first pulse width a of the first pulse 10 is determined to be 136H, and the second pulse width b of the second pulse 20 is determined to be 112H.

[0091] S13. In at least one output stage, the first pulse of the light emitting control signal is controlled to be output according to the first pulse width, and the second pulse of the light emitting control signal is controlled to be output according to the second pulse width.

[0092] The display panel includes a scanning driving circuit, which is electrically connected to the gates of the light emitting control transistors T5 and T6 in the pixel circuit through the light emitting control signal line, and transmits a light emitting control signal EM having a first pulse width a and a second pulse width b to the light emitting control transistors T5 and T6 in at least one output stage. Afterwards, the pixel circuit can control the light emitting device OLED to emit light in response to receiving the light emitting control signal EM, thereby realizing display control.

[0093] Exemplarily, in any output stage, the first pulse of the light emitting control signal is controlled to be output according to the first pulse width, and the second pulse of the light emitting control signal is controlled to be output according to the second pulse width.

[0094] The embodiment of the present disclosure optimizes the pulse width of the output pulse of the light emitting control signal EM (ie, a>b), and it has been verified that the SVM value can meet the set SVM specification (SPEC).

[0095] In some embodiments, the light emitting control signal EM includes a first pulse 10 and at least one second pulse 20; the first pulse 10 is the first valid pulse of the light emitting control signal EM in the output stage t1; the second pulse 20 is a non-first valid pulse of the light emitting control signal EM in the output stage t1. Optionally, the second pulse 20 includes multiple, such as Figure 2 As shown, the second pulse 20 is the second effective pulse, the third effective pulse and the fourth effective pulse of the light emitting control signal EM in the output stage t1.

[0096] This embodiment optimizes the pulse width of the light emitting control signal EM output pulse, such as the first pulse width a of the first valid pulse after reset, which is greater than the second pulse width b of other subsequent valid pulses. It has been verified that the SVM value can meet the set SVM specification (SPEC).

[0097] In some embodiments, the light emitting control signal EM includes a first pulse 10 and at least two second pulses 20; the first pulse 10 is the second valid pulse of the light emitting control signal EM in the output stage t1; the second pulse 20 is the remaining valid pulses of the light emitting control signal EM in the output stage t1 except the second valid pulse. Optionally, the second pulse 20 includes a plurality of Figure 4 As shown, the second pulse 20 is the first effective pulse, the third effective pulse and the fourth effective pulse of the light emitting control signal EM in the output stage t1.

[0098] This embodiment optimizes the pulse width of the output pulse of the light control signal EM, such as the first pulse width a of the first pulse 10 with an earlier output timing is greater than the second pulse width b of the second pulse 20 with a later output timing. It has been verified that the SVM value can meet the set SVM specification (SPEC).

[0099] In some embodiments, for the above S12, Figure 5 As shown, the specific process of determining the first pulse width a of the first pulse 10 and the second pulse width b of the second pulse 20 includes S12-1-1 to S12-1-2.

[0100] S12-1-1. Determine an initial pulse width of a first pulse and an initial pulse width of a second pulse corresponding to a target brightness value according to a preset first association relationship between display brightness values ​​and respective pulse widths.

[0101] The display brightness value DBV (0-1197) is preset to correspond to the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20, and a first association relationship is established. Optionally, the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20 are the same. For example, the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N10 node are both 12H; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N9 node are both 12; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N8 node are both 24H; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N7 node are both 44; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to 30nit are both 72; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N6 node are both 112; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N5 node are both 208H. It should be noted that as the display brightness value DBV increases, the initial pulse widths of the first pulse 10 and the second pulse 20 tend to increase as a whole.

[0102] In this step, the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20 corresponding to the target brightness value can be found according to the first association relationship.

[0103] S12-1-2. According to a preset first target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse to obtain updated first pulse width and second pulse width.

[0104] Exemplarily, the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to each display brightness value DBV are the same. The initial pulse width of the first pulse 10 and / or the initial pulse width of the second pulse 20 can be dynamically adjusted according to the first target pulse width difference m, with ab=m as the target, to obtain the final updated first pulse width a and second pulse width b.

[0105] Optionally, according to the preset first target pulse width difference m, ensure that the initial pulse width of the second pulse 20 remains unchanged, increase the initial pulse width of the first pulse 10, so that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 is equal to the first target pulse width difference m, that is, ab = m. Taking 30nit and m as a fixed value of 24H as an example, it is known that the initial pulse widths of the first pulse 10 and the second pulse 20 are both 72H, and ensure that the initial pulse width of the second pulse 20 remains unchanged, then the updated second pulse width b of the second pulse 20 is 72H; then, according to the preset first target pulse width difference m, increase the initial pulse width of the first pulse 10, and determine that the updated first pulse width a = 72H + 24H = 96H.

[0106] Optionally, according to the preset first target pulse width difference m, the initial pulse width of the first pulse 10 is increased while the initial pulse width of the second pulse 20 is decreased, so that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 is equal to the first target pulse width difference m, that is, ab = m. Taking 30nit and m as a fixed value of 24H as an example, it is known that the initial pulse widths of the first pulse 10 and the second pulse 20 are both 72H, the initial pulse width of the first pulse 10 is increased, and the first pulse width a is determined to be 94H, and the initial pulse width of the second pulse 20 is decreased, and the second pulse width b is determined to be 70H.

[0107] Optionally, according to the preset first target pulse width difference m, the initial pulse width of the first pulse 10 is ensured to remain unchanged, and the initial pulse width of the second pulse 20 is reduced, so that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 is equal to the first target pulse width difference m, that is, ab = m. Taking 30nit and m as a fixed value of 24H as an example, it is known that the initial pulse widths of the first pulse 10 and the second pulse 20 are both 96H, and the initial pulse width of the first pulse 10 is ensured to remain unchanged, then the updated first pulse width a of the first pulse 10 is 96H; thereafter, according to the preset first target pulse width difference m, the initial pulse width of the second pulse 20 is reduced, and the updated second pulse width b is determined to be 96H-24H=72H.

[0108] In some embodiments, the preset first target pulse width difference m is between 4H and 48H; H represents the time for the light emitting control signal EM to scan a row of sub-pixels.

[0109] Optionally, the first target pulse width difference m is 24 H. As shown in Table 2, it shows some display brightness values ​​DBV, such as nodes N10 to N5, and the first pulse width a after the first pulse 10 is updated and the second pulse width b after the second pulse 20 is updated at 30 nit brightness, and the difference m between the two is a fixed value of 24 H.

[0110] Exemplarily, the first pulse width a of the first effective pulse (first pulse 10) minus the second pulse width b of the second effective pulse (second pulse 20) is equal to 24H. After verification, as shown in Table 3, at brightnesses of 2nit, 30nit, 120nit and 500nit, the improved SVM values ​​are 0.56, 0.32, 0.22 and 0.16, respectively, meeting the SVM specification (SPEC) set by the user. Comparing Table 1, it can be seen that when the first pulse width a of the first effective pulse after reset minus the second pulse width b of other effective pulses is greater than or equal to 24H in the embodiment of the present disclosure, the SVM value can be reduced, thereby reducing the stroboscopic damage of the display panel.

[0111] Table 3

[0112] Actual brightness (nit) SPET SVM value (after improvement) 500 ≤0.18 0.16 120 ≤0.26 0.22 30 ≤0.33 0.32 2 ≤1 0.56

[0113] Although the above-mentioned embodiments have improved the SVM result, it is found through testing that the actual brightness (nit) corresponding to the high display brightness value DBV is smaller than the actual brightness (nit) corresponding to the low display brightness value DBV. Figure 6 As shown, there is a brightness inversion area. For specific data, please refer to Table 4.

[0114] Table 4

[0115]

[0116] Among them, the actual brightness corresponding to the display brightness value DBV of 422 is 10.74nit, and the actual brightness corresponding to the display brightness value DBV of 423 is 10.625nit; the actual brightness corresponding to the display brightness value DBV of 589 is 21.115nit, and the actual brightness corresponding to the display brightness value DBV of 590 is 20.78nit; the actual brightness corresponding to the display brightness value DBV of 634 is 24.92nit, and the actual brightness corresponding to the display brightness value DBV of 635 is 24.62nit; the actual brightness corresponding to the display brightness value DBV of 704 is 31.23nit, and the actual brightness corresponding to the display brightness value DBV of 705 is 30.87nit. For the adjacent display brightness values ​​DBV mentioned above, the actual brightness decreases instead of increases, and the degree of brightness change (DL / L=(latter brightness-previous brightness) / previous brightness) is negative, which violates the rule that the actual brightness increases with the increase of the display brightness value DBV. In addition, the absolute value of DL / L is large, resulting in the brightness increase in the DBV switching process no longer being a smooth transition. The change in brightness may cause screen flickering, which is visible to the user and causes adverse effects.

[0117] In this regard, the embodiment of the present disclosure further optimizes the pulse width of the output pulse of the light emitting control signal EM. Specifically, as the DBV value increases, the difference between the first pulse width a and the second pulse width b gradually decreases. In some embodiments, for the above S12, as Figure 7 As shown, the specific process of determining the first pulse width a of the first pulse 10 and the second pulse width b of the second pulse 20 includes S12-2-1 to S12-2-4.

[0118] S12-2-1. Determine a second association relationship corresponding to the preset brightness interval according to the preset brightness interval in which the target brightness value is located.

[0119] Among them, the display brightness interval 0 to 1197 (less than the preset brightness value 1198) includes one preset brightness interval or multiple preset brightness intervals. The display brightness interval 0 to 1197 includes one preset brightness interval, which means that the display brightness interval is the preset brightness interval. The display brightness interval 0 to 1198 includes multiple preset brightness intervals, and the display brightness value DBV in any preset brightness interval is a continuous value. Optionally, the preset brightness interval includes a first interval 21 and a second interval 22; the display brightness value DBV in the first interval 21 is less than the display brightness value DBV in the second interval 22. For example, the display brightness value DBV in the first interval 21 is 0 to 410; the display brightness value DBV in the second interval 22 is 410 to 1197.

[0120] Among them, the second association relationship represents the association relationship between each display brightness value DBV within the preset brightness interval and the first preset pulse width difference m”; in the first interval 21, the first preset pulse width difference m” is a fixed value; in the second interval 22, the first preset pulse width difference m” is monotonically decreasing (but not zero).

[0121] S12-2-2. Determine a second target pulse width difference corresponding to the target brightness value according to the second association relationship.

[0122] When the target brightness value is within the first interval 21 , the second target pulse width difference is a fixed value.

[0123] When the target brightness value is within the second interval 22, the second target pulse width difference is a monotonically changing value, that is, it decreases as the target brightness value increases. Exemplarily, the second correlation relationship is a linear relationship that satisfies a linear equation (also called a first-order equation), the independent variable is the display brightness value DBV, and the dependent variable is the first preset pulse width difference m", and the two have a unique corresponding relationship. When the target brightness value is known, the first preset pulse width difference m" corresponding to the target brightness value can be uniquely determined, and is recorded as the second target pulse width difference. Also exemplarily, the second correlation relationship corresponding to the second interval 22 satisfies a piecewise linear function, and the overall trend is monotonically decreasing.

[0124] S12-2-3. Determine the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value according to a preset first association relationship between the display brightness value and each pulse width.

[0125] The display brightness value DBV (0-1197) is preset to correspond to the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20, and a first association relationship is established. Optionally, the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20 are the same. For example, the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N10 node are both 12H; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N9 node are both 12; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N8 node are both 24H; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N7 node are both 44; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to 30nit are both 72; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N6 node are both 112; the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to the N5 node are both 208H. It should be noted that as the display brightness value DBV increases, the initial pulse widths of the first pulse 10 and the second pulse 20 tend to increase as a whole.

[0126] In this step, the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20 corresponding to the target brightness value can be found according to the first association relationship.

[0127] S12-2-4. According to the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse to obtain updated first pulse width and second pulse width.

[0128] Exemplarily, the initial pulse widths of the first pulse 10 and the second pulse 20 corresponding to each display brightness value DBV are the same. The initial pulse width of the first pulse 10 and / or the initial pulse width of the second pulse 20 can be dynamically adjusted according to the second target pulse width difference m', with ab=m' as the target, to obtain the final updated first pulse width a and second pulse width b.

[0129] Optionally, according to the determined second target pulse width difference m', ensure that the initial pulse width of the second pulse 20 remains unchanged, and increase the initial pulse width of the first pulse 10 so that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 is equal to the second target pulse width difference m', that is, ab=m'.

[0130] Optionally, according to the determined second target pulse width difference m', the initial pulse width of the first pulse 10 is increased while the initial pulse width of the second pulse 20 is reduced, so that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 is equal to the second target pulse width difference m', that is, ab=m'.

[0131] Optionally, according to the determined second target pulse width difference m', ensure that the initial pulse width of the first pulse 10 remains unchanged, and reduce the initial pulse width of the second pulse 20, so that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 is equal to the second target pulse width difference m', that is, ab=m'.

[0132] In some embodiments, the second association relationship satisfies or Wherein, X represents the target brightness value, k is any number between 0 and 0.07 (including the endpoint value), u is any number between 40H and 85H (including the endpoint value), and H represents the time for the light emitting control signal EM to scan a row of sub-pixels; Indicates rounding up. represents rounding down, and Y represents the second target pulse width difference. Optionally, Y is an even number.

[0133] In some embodiments, when the target brightness value is within the first interval 21, the second target pulse width difference can be determined according to the second association relationship represented by the following expression 1; Expression 1: Y=p, p is any number between 35H and 45H; for example, p=35H, 40H or 45H.

[0134] Exemplarily, p=40H. Specifically, when the target brightness value is within the first interval 21, the second target pulse width difference is determined to be 40H.

[0135] In some embodiments, when the target brightness value is in the second interval 22, the second target pulse width difference is determined according to the second association relationship represented by the following expression 2; Expression 2: or Wherein, X represents the target brightness value, k is any number between -0.063 and -0.017 (including the endpoint value), and u is any number between 43.67H and 81.07H (including the endpoint value); Indicates rounding up. represents rounding down, and Y represents the second target pulse width difference. Optionally, Y is an even number.

[0136] Exemplarily, k=-0.023, u=18.7 H. Specifically, when the target brightness value is in the second interval 22, the second target pulse width difference Y=-0.023*X+18.7 H is determined.

[0137] In some embodiments, Figure 8As shown, the second interval 22 includes a first sub-interval 221, a second sub-interval 222, a third sub-interval 223 and a fourth sub-interval 224; the display brightness value DBV in the first sub-interval 221 is 410-580; the display brightness value DBV in the second sub-interval 222 is 580-700; the display brightness value DBV in the third sub-interval 223 is 700-910; the display brightness value DBV in the fourth sub-interval 224 is 910-1197.

[0138] For S12-2-2, specifically: when the target brightness value is in the first sub-interval 221, the second target pulse width difference is determined according to the second association relationship represented by the following formula 1. Formula 1: or Specifically, when the target brightness value is 495, according to Formula 1, Y=36.21H is obtained, which is rounded down to ensure that Y is an even number, that is, the second target pulse width difference is 36.

[0139] When the target brightness value is in the second sub-interval 222, the second target pulse width difference is determined according to the second association relationship represented by the following formula 2. Formula 2: or Specifically, when the target brightness value is 640, according to Formula 2, Y=32.76H is obtained, which is rounded down to ensure that Y is an even number, that is, the second target pulse width difference is 32H.

[0140] When the target brightness value is in the third sub-interval 223, the second target pulse width difference is determined according to the second association relationship represented by the following formula 3: or Specifically, when the target brightness value is 805, according to Formula 3, Y=28.08H is rounded down to ensure that Y is an even number, that is, the second target pulse width difference is 28H.

[0141] When the target brightness value is in the fourth sub-interval 224, the second target pulse width difference is determined according to the second association relationship represented by the following formula 4: or Specifically, when the target brightness value is 1054, according to Formula 4, Y=14.668H is rounded down to ensure that Y is an even number, that is, the second target pulse width difference is 14H.

[0142] like Figure 8As shown, the second correlation relationship between each display brightness value DBV in the second interval 22 and the first preset pulse width difference m" satisfies a piecewise linear function, and the absolute value of the slope of the function segment corresponding to the second sub-interval 222 is smaller than the absolute value of the slope of the function segment corresponding to the first sub-interval 221; the absolute value of the slope of the function segment corresponding to the first sub-interval 221 is smaller than the absolute value of the slope of the function segment corresponding to the third sub-interval 223; the absolute value of the slope of the function segment corresponding to the third sub-interval 223 is smaller than the absolute value of the slope of the function segment corresponding to the fourth sub-interval 224. The absolute value of the slope of the function segment corresponding to each sub-interval is greater than the slope (0) of the function segment corresponding to the first interval 21.

[0143] Exemplarily, taking the preset brightness threshold (DBV value) as 1198 as an example, as shown in Table 5, in the first dimming mode, in the first interval 21, the first preset pulse width difference m' remains unchanged and is a fixed value of 40H; in the second interval 22, as the DBV value increases, the first preset pulse width difference m" decreases monotonically.

[0144] Table 5

[0145]

[0146] In some embodiments, the light emitting control signal EM includes a plurality of second pulses 20 in the output stage t1 , and the second pulse widths b of the second pulses 20 are the same.

[0147] Alternatively, if Figure 2 As shown, the second pulse 20 is the second effective pulse, the third effective pulse and the fourth effective pulse of the light emitting control signal EM in the output stage t1. The second pulse width b of the second effective pulse, the third effective pulse and the fourth effective pulse are all the same.

[0148] Alternatively, if Figure 4 As shown, the second pulse 20 is the first effective pulse, the third effective pulse and the fourth effective pulse of the light emitting control signal EM in the output stage t1. The second pulse width b of the first effective pulse, the third effective pulse and the fourth effective pulse are all the same.

[0149] In some embodiments, the light emitting control signal EM includes a plurality of second pulses 20 in the output stage t1, and the second pulse widths b of at least some of the second pulses 20 are different. Fig. 9As shown, the second pulse width b of the second pulse 20 with an earlier output timing is greater than the second pulse width b of the second pulse 20 with a later output timing. Taking the second effective pulse, the third effective pulse and the fourth effective pulse in the output stage t1 as an example, the second pulse width b1 of the second effective pulse is greater than the second pulse width b2 of the third effective pulse; and / or, the second pulse width b2 of the third effective pulse is greater than the second pulse width b3 of the fourth effective pulse. This embodiment optimizes the second pulse width b of different second pulses 20 so that the second pulse width b of the second pulse 20 with an earlier output timing is greater than the second pulse width b of the second pulse 20 with a later output timing, so as to reduce the absolute value of DL / L, thereby improving the flickering problem.

[0150] In some embodiments, Fig. 9 As shown, for any output stage t1, the second pulse width b of the second pulse 20 (i.e., the second pulse 201) adjacent to the first pulse 10 in the output timing is recorded as the first sub-pulse width b01, and the second pulse width b of the remaining second pulses 20 (i.e., the second pulses 202 and 203) is recorded as the second sub-pulse width b02.

[0151] For the above S12, if Fig.10 As shown, the specific process of determining the first pulse width a of the first pulse 10 and the first sub-pulse width b01 of the second pulse 20 includes S12-3-1 to S12-3-4.

[0152] S12-3-1. Determine a second association relationship corresponding to the preset brightness interval according to the preset brightness interval in which the target brightness value is located.

[0153] Among them, the second association relationship represents the association relationship between each display brightness value DBV within the preset brightness range and the first preset pulse width difference m", and within the preset brightness range, the first preset pulse width difference m" is monotonically decreasing; the first preset pulse width difference m" represents the preset pulse width difference corresponding to the first output sub-stage.

[0154] For the specific implementation of this step, please refer to S12-2-1, and the repeated parts will not be repeated.

[0155] S12-3-2. Determine a second target pulse width difference corresponding to the target brightness value according to the second association relationship.

[0156] For the specific implementation of this step, please refer to S12-2-2, and the repeated parts will not be repeated.

[0157] S12-3-3. Determine the initial pulse width of the first pulse corresponding to the target brightness value and the initial pulse width of the second pulse adjacent to the first pulse according to a preset first association relationship between the display brightness value and each pulse width.

[0158] The display brightness value DBV (0-1197) is preset to correspond to the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20, and a first association relationship is established. Optionally, the initial pulse width of the first pulse 10 is the same as the initial pulse width of the second pulse 20. It should be noted that as the display brightness value DBV gradually increases, the initial pulse widths of the first pulse 10 and the second pulse 20 also gradually increase.

[0159] In this step, the initial pulse width of the first pulse 10 corresponding to the target brightness value and the initial pulse width of the second pulse 20 adjacent to the first pulse 10 can be found according to the first association relationship.

[0160] S12-3-4. According to the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse adjacent to the first pulse to obtain an updated first pulse width and a first sub-pulse width.

[0161] For the specific implementation process of adjusting the initial pulse width of the first pulse 10 in this step, please refer to the specific implementation process of adjusting the initial pulse width of the first pulse 10 in S12-2-4; for the principle of the specific implementation process of adjusting the pulse width of the first sub-pulse width b01, please refer to the specific implementation process of adjusting the initial pulse width of the second pulse 20 in S12-2-4, and the repeated parts will not be repeated here.

[0162] In some embodiments, Fig.11 As shown, the step of determining the second sub-pulse width b02 of the remaining second pulses 202 and 203 includes S12-3-51.

[0163] S12-3-51. Adjust the initial pulse width of the remaining second pulses according to the preset third target pulse width difference to obtain an updated second sub-pulse width.

[0164] The above S12-3-3 also includes determining the initial pulse widths of the remaining second pulses 202 and 203 corresponding to the target brightness value according to a preset first association relationship between the display brightness value and each pulse width. Exemplarily, the initial pulse widths of the second pulses 202 and 203 are the same.

[0165] Optionally, the difference between the second pulse widths b of adjacent second pulses 20 is equal. Fig. 9 As shown, the difference between the updated first sub-pulse width b1 of the second pulse 201 and the updated second sub-pulse width b2 of the second pulse 202 is the third target pulse width difference n=b1-b2; the difference between the updated second sub-pulse width b2 of the second pulse 202 and the updated second sub-pulse width b3 of the second pulse 203 is the third target pulse width difference n=b2-b3.

[0166] Optionally, according to the preset third target pulse width difference n, the first sub-pulse width b1 is ensured to remain unchanged, and the initial pulse widths of the remaining second pulses 202 and 203 are reduced, so that the first sub-pulse width b01 minus the updated second sub-pulse width b2 equals the third target pulse width difference n, that is, b1-b2=n. And the first sub-pulse width b01 minus the updated second sub-pulse width b3 equals the third target pulse width difference n, that is, b1-b3=n. At this time, b2=b3.

[0167] In some embodiments, the preset third target pulse width difference n is between 4H and 20H; H represents the time for the light emitting control signal EM to scan a row of sub-pixels.

[0168] Optionally, the third target pulse width difference n is 4H. As shown in Table 6, it shows a portion of the display brightness value DBV, such as nodes N10-N5, and the first pulse width a after the first pulse 10 is updated, the first sub-pulse width b1 after the second pulse 201 is updated, the second sub-pulse width b2 after the second pulse 202 is updated, and the second sub-pulse width b3 after the second pulse 203 is updated at a brightness of 30nit, a-b1 is monotonically decreasing, b1-b2=b2-b3=n=4H.

[0169] Table 6

[0170]

[0171] Specifically, in the first dimming mode, the pulse width of each effective pulse decreases in sequence, a>b1>b2>b3, and m" decreases with the increase of DBV value, n=b1-b2=b2-b3. After verification, if Fig.12 As shown, compared Figure 6 The data show that the DL / L value in the brightness inversion area is significantly reduced, thereby improving the screen flickering problem. Fig.12 The brightness inversion area is shown in Table 7 for specific data.

[0172] Table 7

[0173]

[0174] Among them, the actual brightness corresponding to the display brightness value DBV of 422 is 10.74nit, and the actual brightness corresponding to the display brightness value DBV of 423 is 10.665nit; the actual brightness corresponding to the display brightness value DBV of 589 is 21.115nit, and the actual brightness corresponding to the display brightness value DBV of 590 is 21nit; the actual brightness corresponding to the display brightness value DBV of 634 is 24.92nit, and the actual brightness corresponding to the display brightness value DBV of 635 is 24.82nit; the actual brightness corresponding to the display brightness value DBV of 704 is 31.23nit, and the actual brightness corresponding to the display brightness value DBV of 705 is 31.11nit. Comparing the data in Table 4, it can be seen that the actual brightness difference corresponding to the adjacent display brightness values ​​DBV is reduced. Although the DL / L value is still negative, the absolute value of the tube DL / L is small, and a smooth transition can be achieved during the brightness increase process, so there will be no screen flickering.

[0175] In some embodiments, Fig.13 As shown, the step of determining the second sub-pulse width b02 of the remaining second pulse 20 includes S12-3-61 to S12-3-63.

[0176] S12-3-61. Determine a fourth target pulse width difference between any two adjacent second pulses based on the determined second target pulse width difference.

[0177] The fourth target pulse width difference is smaller than the second target pulse width difference. As shown in Table 8, the fourth target pulse width difference r1 between the second pulse 201 and the second pulse 202 is 4H different from the second target pulse width difference. The fourth target pulse width difference r2 between the second pulse 202 and the second pulse 203 is 8H different from the second target pulse width difference.

[0178] Table 8

[0179]

[0180] Optionally, a fourth target pulse width difference between two adjacent second pulses in one group is smaller than a fourth target pulse width difference between two adjacent second pulses in the next group.

[0181] S12-3-62. According to the fourth target pulse width difference, adjust the initial pulse width of the remaining second pulses to obtain an updated second sub-pulse width.

[0182] For example, as shown in Table 8, when the target brightness value is 1197, the second target pulse width difference value is 12H, r1=8H, r2=4H; then, Fig. 9As shown, based on the known initial pulse widths of the remaining second pulses (202 and 203) and the first sub-pulse width b1=208H, the second sub-pulse width b2=b1-8=200H of the second pulse 202 is determined, and the second sub-pulse width b3=b2-4=196H of the second pulse 203 is determined.

[0183] In some embodiments, the fourth target pulse width difference of two adjacent second pulses in the first output sequence is greater than or equal to the fourth target pulse width difference of two adjacent second pulses in the second output sequence. As shown in Table 8, r1≥r2.

[0184] Optionally, the fourth target pulse width difference between two adjacent groups of second pulses differs by 4H, where H represents the time for the light emitting control signal to scan a row of sub-pixels. As shown in Table 8, r1-r2=4H.

[0185] Optionally, the second target pulse width difference corresponding to the first pulse and the fourth target pulse width difference corresponding to the second pulse adjacent to the first pulse differ by 4H. As shown in Table 8, m"-r1=4H.

[0186] In some embodiments, Fig.14 As shown, when the target brightness value is greater than or equal to the preset brightness threshold, the target duty cycle of the light control signal EM is determined; the target duty cycle is between 89% and 97%; for any output stage t1, the light control signal EM is controlled to be output according to the target duty cycle.

[0187] When the target brightness value is greater than or equal to the preset brightness threshold, the second dimming mode is started, and the light control signal EM is output according to the target duty cycle. Optionally, using 3P3H timing, in the second dimming mode, the light control signal EM includes three third pulses 30, and the sum of the third pulse widths of the three third pulses 30 divided by one frame time is the target duty cycle. Here, the third pulse 30 refers to a valid pulse (low level is valid). This embodiment increases the duty cycle of the light control signal EM in the second dimming mode so that it is between 89% and 97%, for example, 96.82%, as shown in Table 9, which is beneficial to reducing the SVM value.

[0188] Table 9

[0189]

[0190] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0191] In addition, the present disclosure also provides a display panel, such as Fig.15As shown, the display panel includes a driver 100 and a scan driving circuit 200 .

[0192] The driver 100 is configured to obtain a target brightness value currently displayed by the display panel; when the target brightness value is less than a preset brightness threshold, the first pulse width a of the first pulse 10 and the second pulse width b of the second pulse 20 of the light-emitting control signal EM in the output stage t1 are determined according to the target brightness value; the output timing of the first pulse 10 is at least before the output timing of a second pulse 20, and the first pulse width a is greater than the second pulse width b.

[0193] It should be noted that the driver 100 in the embodiment of the present disclosure is configured to execute steps S11 to S12 in the above display control method, and the repeated parts will not be repeated.

[0194] The scan driving circuit 200 is configured to control the first pulse 10 of the light emitting control signal EM to be output with a first pulse width a and control the second pulse 20 of the light emitting control signal EM to be output with a second pulse width b in at least one output stage t1.

[0195] It should be noted that the scan driving circuit 200 in the embodiment of the present disclosure is configured to execute step S13 in the above display control method, and the repeated parts will not be described in detail.

[0196] In some embodiments, Fig.15 As shown, the display panel further includes a light emitting device OLED and a pixel circuit 300 for driving the light emitting device OLED. Figure 3 As shown, the scan driving circuit 200 is electrically connected to the pixel circuit 300 through a light emitting control signal line; the light emitting control signal line is used to transmit a light emitting control signal EM.

[0197] In some embodiments, Fig.15 As shown, the driver 100 is also configured to determine the target duty cycle of the light-emitting control signal EM when the target brightness value is greater than or equal to a preset brightness threshold; the target duty cycle is between 89% and 97%; the scanning drive circuit 200 is also configured to control the light-emitting control signal EM to be output according to the target duty cycle for any output stage t1.

[0198] The present disclosure also provides a display device, which includes a display panel according to any one of the above embodiments. The display device can be, for example, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a vehicle-mounted device, or any other product with a display function. Other essential components of the display device should be understood by a person of ordinary skill in the art, and will not be described in detail here, nor should they be used as a limitation to the present disclosure.

[0199] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display control method, wherein: include: Get the target brightness value currently displayed by the display panel; When the target brightness value is less than a preset brightness threshold, determining a first pulse width of a first pulse and a second pulse width of a second pulse of a light emitting control signal in an output stage according to the target brightness value; The output timing of the first pulse is at least before the output timing of one of the second pulses, and the first pulse width is greater than the second pulse width; In at least one of the output stages, the first pulse of the light emitting control signal is controlled to be output according to the first pulse width, and the second pulse of the light emitting control signal is controlled to be output according to the second pulse width.

2. The display control method according to claim 1, wherein: The light emitting control signal includes a first pulse and at least one second pulse; The first pulse is the first valid pulse of the light emitting control signal in the output stage; The second pulse is a non-first valid pulse of the light emitting control signal in the output stage.

3. The display control method according to claim 1, wherein: The light emitting control signal includes a first pulse and at least two second pulses; The first pulse is the second valid pulse of the light emitting control signal in the output stage; the second pulse is the remaining valid pulses of the light emitting control signal in the output stage except the second valid pulse.

4. The display control method according to claim 1, wherein: The step of determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emitting control signal in the output stage according to the target brightness value comprises: Determining an initial pulse width of the first pulse and an initial pulse width of the second pulse corresponding to the target brightness value according to a preset first association relationship between display brightness values ​​and respective pulse widths; According to a preset first target pulse width difference, an initial pulse width of the first pulse and an initial pulse width of the second pulse are adjusted to obtain an updated first pulse width and a second pulse width.

5. The display control method according to claim 4, wherein: The display panel includes a plurality of rows of sub-pixels; the first target pulse width difference is between 4H and 48H; and H represents the time for the light emitting control signal to scan a row of sub-pixels.

6. The display control method according to claim 1, wherein: The step of determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emitting control signal in the output stage according to the target brightness value comprises: According to the preset brightness interval in which the target brightness value is located, determining a second association relationship corresponding to the preset brightness interval; the second association relationship represents an association relationship between each display brightness value in the preset brightness interval and a first preset pulse width difference value; the preset brightness interval includes a first interval and a second interval; the display brightness value in the first interval is less than the display brightness value in the second interval; in the first interval, the first preset pulse width difference value is a fixed value; in the second interval, the first preset pulse width difference value is monotonically decreasing; Determining a second target pulse width difference corresponding to the target brightness value according to the second association relationship; Determining an initial pulse width of the first pulse and an initial pulse width of the second pulse corresponding to the target brightness value according to a preset first association relationship between display brightness values ​​and respective pulse widths; According to the second target pulse width difference, the initial pulse width of the first pulse and the initial pulse width of the second pulse are adjusted to obtain updated first pulse width and second pulse width.

7. The display control method according to claim 6, wherein: The display brightness value in the first interval is 0 to 410; the display brightness value in the second interval is 410 to 1197; Determining the second target pulse width difference corresponding to the target brightness value according to the second association relationship includes: When the target brightness value is within the first interval, the second target pulse width difference is determined according to the second association relationship represented by the following expression 1; the expression 1: Y=p, p is any number between 35H and 45H; H represents the time for the light emitting control signal to scan a row of sub-pixels; When the target brightness value is within the second interval, the second target pulse width difference is determined according to the second association relationship represented by the following expression 2: or Wherein, X represents the target brightness value, k is any number between -0.063 and -0.017, and u is any number between 43.67H and 81.07H. Indicates rounding up. represents rounding down, and Y represents the second target pulse width difference.

8. The display control method according to claim 7, wherein: The second interval includes a first sub-interval, a second sub-interval, a third sub-interval and a fourth sub-interval; the display brightness value in the first sub-interval is 410-580; the display brightness value in the second sub-interval is 580-700; the display brightness value in the third sub-interval is 700-910; the display brightness value in the fourth sub-interval is 910-1197; Determining the second target pulse width difference corresponding to the target brightness value according to the second association relationship includes: When the target brightness value is within the first sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 1: or When the target brightness value is within the second sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 2: or When the target brightness value is within the third sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 3: or When the target brightness value is within the fourth sub-interval, the second target pulse width difference is determined according to the second association relationship represented by the following formula 4: or 9. The display control method according to any one of claims 1 to 8, wherein: The light emitting control signal comprises a plurality of second pulses in the output stage, and the second pulse widths of the second pulses are the same.

10. The display control method according to claim 1, wherein: The light emitting control signal comprises a plurality of second pulses in the output stage, and the second pulse width of the second pulse with an earlier output timing is greater than the second pulse width of the second pulse with a later output timing.

11. The display control method according to claim 10, wherein: For any of the output stages, the second pulse width of the second pulse adjacent to the first pulse in the output timing is recorded as the first sub-pulse width, and the second pulse widths of the remaining second pulses are recorded as the second sub-pulse width; Determining, according to the target brightness value, a first pulse width of a first pulse and a first sub-pulse width of a second pulse of the light emitting control signal in an output stage, comprising: According to the preset brightness interval in which the target brightness value is located, determining a second association relationship corresponding to the preset brightness interval; the second association relationship represents an association relationship between each display brightness value in the preset brightness interval and a first preset pulse width difference value; the preset brightness interval includes a first interval and a second interval; the display brightness value in the first interval is less than the display brightness value in the second interval; in the first interval, the first preset pulse width difference value is a fixed value; in the second interval, the first preset pulse width difference value is monotonically decreasing; Determining a second target pulse width difference corresponding to the target brightness value according to the second association relationship; Determine, according to a preset first association relationship between display brightness values ​​and respective pulse widths, an initial pulse width of the first pulse corresponding to the target brightness value and an initial pulse width of a second pulse adjacent to the first pulse; According to the second target pulse width difference, the initial pulse width of the first pulse and the initial pulse width of the second pulse adjacent to the first pulse are adjusted to obtain an updated first pulse width and a first sub-pulse width.

12. The display control method according to claim 11, wherein: The step of determining the second sub-pulse width of the remaining second pulse comprises: According to the preset third target pulse width difference, the initial pulse width of the remaining second pulse is adjusted to obtain an updated second sub-pulse width.

13. The display control method according to claim 12, wherein: The display panel includes a plurality of rows of sub-pixels; the third target pulse width difference is between 4H and 20H; and H represents the time for the light emitting control signal to scan a row of sub-pixels.

14. The display control method according to claim 11, wherein: The step of determining the second sub-pulse width of the remaining second pulse comprises: According to the determined second target pulse width difference, a fourth target pulse width difference between any two adjacent second pulses is determined; the fourth target pulse width difference is smaller than the second target pulse width difference; According to the fourth target pulse width difference, the initial pulse width of the remaining second pulse is adjusted to obtain an updated second sub-pulse width.

15. The display control method according to claim 14, wherein: A fourth target pulse width difference between two adjacent second pulses whose output timing is earlier is greater than or equal to a fourth target pulse width difference between two adjacent second pulses whose output timing is later.

16. The display control method according to claim 15, wherein: The fourth target pulse width difference between two adjacent groups of the second pulses is 4H; H represents the time for the light emitting control signal to scan a row of sub-pixels; The second target pulse width difference corresponding to the first pulse and the fourth target pulse width difference corresponding to the second pulse adjacent to the first pulse differ by 4H.

17. The display control method according to claim 1, wherein: The display control method further includes: When the target brightness value is greater than or equal to the preset brightness threshold, determining a target duty cycle of the light control signal; the target duty cycle is between 89% and 97%; For any of the output stages, the light emission control signal is controlled to be output according to the target duty cycle.

18. The display control method according to claim 1, wherein: The light emitting control signal includes three reset phases and three output phases in one frame sequence; each of the output phases includes four output sub-phases, and one output sub-phase corresponds to one first pulse or one second pulse.

19. A display panel comprising a driver and a scan drive circuit; A driver configured to obtain a target brightness value currently displayed by the display panel; When the target brightness value is less than a preset brightness threshold, determining a first pulse width of a first pulse and a second pulse width of a second pulse of a light emitting control signal in an output stage according to the target brightness value; The output timing of the first pulse is at least before the output timing of one of the second pulses, and the first pulse width is greater than the second pulse width; The scan driving circuit is configured to control the first pulse of the light emitting control signal to be output according to the first pulse width, and control the second pulse of the light emitting control signal to be output according to the second pulse width in at least one of the output stages.

20. A computer non-transitory readable storage medium, wherein: The computer non-transitory readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the display control method according to any one of claims 1 to 18 are executed.

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