Dimming method of display device, display device

Abstract

This disclosure relates to the field of display technology, and discloses a dimming method and a display device. The dimming method includes: a PWM dimming mode where the target brightness of the display device is less than a first preset dimming brightness threshold; a DC dimming mode where the target brightness is greater than a second preset dimming brightness threshold; and a transition dimming mode where the target brightness is less than or equal to the second preset dimming brightness threshold and greater than or equal to the first preset dimming brightness threshold, wherein the first preset dimming brightness threshold is less than the second preset dimming brightness threshold. In the PWM dimming mode, the number of pulses of the light emission control signal in one frame of the display is N1; in the DC dimming mode, the number of pulses of the light emission control signal in one frame of the display is N2; and in the transition dimming mode, the number of pulses of the light emission control signal in one frame of the display is N3; where N2 < N3 < N1. The display device uses the above dimming method for dimming. This disclosure can effectively improve the problem of brightness abrupt changes during dimming, which is beneficial to improving display visual effects and display quality.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a dimming method for a display device and a display device. Background Technology

[0002] With the rapid development of display technology, users have increasingly higher requirements for the display effect of display devices. One aspect of evaluating the display effect of a display device is to assess whether the transition of brightness changes is smooth during brightness adjustment.

[0003] Currently, OLED (Organic Light-Emitting Diode) screens have become a standard feature in mid-to-high-end smartphones due to their advantages such as high flexibility, energy efficiency, thinness, wide color gamut, and high contrast. However, adjusting the brightness of OLED screens often results in poor transitions during brightness adjustments, meaning sudden brightness changes are common. Furthermore, because the human eye adapts differently to display brightness under varying ambient light conditions, these sudden brightness changes often lead to poor viewing experiences.

[0004] Therefore, providing a dimming method and display device that can effectively improve the problem of brightness abrupt changes during dimming, avoid instantaneous brightness abrupt changes, and improve display visual effects and display quality is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned technical problems, this disclosure provides a dimming method and a display device to solve the problem that existing display devices are prone to sudden brightness changes during dimming, affecting display effects and visual quality.

[0006] This disclosure provides a dimming method for a display device, the dimming method comprising:

[0007] Obtain the target brightness of the display device;

[0008] If the target brightness is less than the first preset dimming brightness threshold, the dimming mode of the display device is PWM dimming mode.

[0009] If the target brightness is greater than the second preset dimming brightness threshold, the dimming mode of the display device is DC dimming mode; wherein, the first preset dimming brightness threshold is less than the second preset dimming brightness threshold;

[0010] The display device includes a light-emitting control circuit and a light-emitting module. The light-emitting control circuit and the light-emitting module are electrically connected. The light-emitting control circuit is used to provide light-emitting control signals to the light-emitting module.

[0011] The display device also includes a transition dimming mode, where the target brightness is less than or equal to a second preset dimming brightness threshold and the target brightness is greater than or equal to a first preset dimming brightness threshold. The dimming mode of the display device is a transition dimming mode, which is executed between PWM dimming mode and DC dimming mode.

[0012] In PWM dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display image is N1;

[0013] In DC dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display image is N2;

[0014] In the transition dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N3; where N1, N2, and N3 are all positive integers, and N2 < N3 < N1.

[0015] Based on the same inventive concept, this disclosure also provides a display device that uses the dimming method of the above-described display device for dimming.

[0016] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0017] The dimming mode of the display device provided in this disclosure adds a transition dimming mode, which operates between PWM dimming mode and DC dimming mode. If the target brightness is less than a first preset dimming brightness threshold, the display device operates in PWM dimming mode, where the light-emitting control circuit controls the number of pulses of the light-emitting control signal within one frame of the display to be N1. If the target brightness is less than or equal to a second preset dimming brightness threshold, and the target brightness is greater than or equal to the first preset dimming brightness threshold, the display device operates in transition dimming mode, where the light-emitting control circuit controls the number of pulses of the light-emitting control signal within one frame of the display to be N3. If the target brightness is greater than the second preset dimming brightness threshold, the display device operates in DC dimming mode, where the light-emitting control circuit... The number of pulses of the light emission control signal within a single frame of the display is controlled to be N2; N2 < N3 < N1. In transition dimming mode, the light emission control circuit controls the number of pulses N3 of the light emission control signal within a single frame of the display to transition between N1 and N2. By directly adjusting the transition of the number of pulses of the light emission control signal within a single frame of the display, the number of pulses of the light emission control signal can be set directly and flexibly, without being limited to the complex adjustment of the duty cycle. This avoids sudden brightness changes caused by differences in light emission current, reduces instantaneous brightness changes during dimming, effectively improves visual effects, ensures the display effect of the display device, and also simplifies the dimming steps, reduces the complexity of the dimming process, and improves the driving performance of the display device. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a dimming method for a display device provided in an embodiment of the present disclosure;

[0021] Figure 2 Is adopted Figure 1 A schematic diagram of the structure of a display device using a dimming method;

[0022] Figure 3 This is a timing diagram illustrating how the light emission control circuit controls the light emission control signal within a display frame under different dimming modes in the dimming method provided in this embodiment.

[0023] Figure 4 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of display in different dimming modes of the dimming method provided in this embodiment of the present disclosure.

[0024] Figure 5 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of display in different dimming modes of the dimming method provided in this embodiment of the present disclosure.

[0025] Figure 6 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of display in different dimming modes of the dimming method provided in this embodiment of the present disclosure.

[0026] Figure 7 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of display in different dimming modes of the dimming method provided in this embodiment of the present disclosure.

[0027] Figure 8 This is another flowchart of a dimming method for a display device provided in the embodiments of this disclosure;

[0028] Figure 9 This is the corresponding setting relationship between the display brightness value and the number of pulses of the light emission control signal in the transition dimming mode of the display device provided in this embodiment of the disclosure;

[0029] Figure 10 This is another flowchart of a dimming method for a display device provided in the embodiments of this disclosure;

[0030] Figure 11 This is another correspondence between the display brightness value and the number of pulses of the light emission control signal in the transition dimming mode of the display device provided in this embodiment of the disclosure;

[0031] Figure 12 yes Figure 2 A schematic diagram of the electrical connection structure between the middle pixel circuit and the light-emitting element;

[0032] Figure 13 Is adopted Figure 1 Another schematic diagram of a display device using a dimming method;

[0033] Figure 14 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of display in different dimming modes of the dimming method provided in this embodiment of the present disclosure.

[0034] Figure 15 This is a linear relationship diagram between the display brightness value and the number of pulses of the light emission control signal provided in the embodiments of this disclosure;

[0035] Figure 16 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of display in different dimming modes of the dimming method provided in this embodiment of the present disclosure.

[0036] Figure 17 This is another linear relationship diagram between the display brightness value and the number of pulses of the light emission control signal provided in the embodiments of this disclosure. Detailed Implementation

[0037] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0038] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0039] Please refer to the reference. Figure 1 and Figure 2 , Figure 1 This is a flowchart illustrating a dimming method for a display device provided in an embodiment of this disclosure. Figure 2 Is adopted Figure 1A schematic diagram of the structure of a display device with a dimming method is shown in this embodiment. The dimming method includes:

[0040] S10: Obtain the target brightness of the display device;

[0041] S11: The target brightness of the display device is less than the first preset dimming brightness threshold, and the dimming mode of the display device is PWM dimming mode;

[0042] S12: When the target brightness of the display device is greater than the second preset dimming brightness threshold, the dimming mode of the display device is DC dimming mode;

[0043] S13: The display device further includes a transition dimming mode, wherein the target brightness of the display device is less than or equal to a second preset dimming brightness threshold and the target brightness is greater than or equal to a first preset dimming brightness threshold, and the dimming mode of the display device is a transition dimming mode, which is executed between PWM dimming mode and DC dimming mode; wherein the first preset dimming brightness threshold is less than the second preset dimming brightness threshold.

[0044] The display device 000 includes a light-emitting control circuit 10 and a light-emitting module 20, which are electrically connected. The light-emitting control circuit 10 is used to provide a light-emitting control signal EM to the light-emitting module 20.

[0045] S111: In PWM dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N1;

[0046] S121: In DC dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N2;

[0047] S131: In the transition dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N3; where N1, N2, and N3 are all positive integers, and N2 < N3 < N1.

[0048] Specifically, the dimming method for the display device provided in this embodiment can be applied to brightness adjustment in organic light-emitting diode (OLED) display devices. The dimming modes of the display device include PWM dimming mode and DC dimming mode. PWM dimming mode refers to adjusting the brightness of the display device using pulse width modulation (PWM) dimming, while DC dimming mode refers to adjusting the brightness of the display device using direct current (DC) dimming. Currently, OLED display devices often use PWM dimming mode to adjust brightness at low brightness levels and DC dimming mode to adjust brightness at high brightness levels. As in the dimming method provided in this embodiment, the target brightness of the display device is first obtained. If the target brightness is less than a first preset dimming brightness threshold, the dimming mode of the display device is PWM dimming mode; if the target brightness is greater than a second preset dimming brightness threshold, the dimming mode of the display device is DC dimming mode.

[0049] Because users with sensitive eyes will clearly perceive flicker when using low-frequency PWM dimming mode—that is, the phenomenon of alternating bright and dark bars on the screen—it affects the viewing experience and increases eye muscle tension. Even for users with less sensitive eyes, there is still a risk of eye damage even if they cannot see the alternation of bright and dark bars. As consumers increasingly pursue health, to reduce screen flicker and achieve eye protection, high-frequency PWM dimming modes are generally used. That is, in the dimming method of this embodiment, if the target brightness is less than a first preset dimming brightness threshold, the display device uses a high-frequency PWM dimming mode. In PWM dimming mode, the light-emitting control circuit 10 controls the number of pulses of the light-emitting control signal EM within one frame of the display screen to be N1, such as... Figure 3 As shown, Figure 3 This is a timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of a display image under different dimming modes in the dimming method provided in this embodiment. For example... Figure 2As shown, the display device 000 includes a light-emitting control circuit 10 and a light-emitting module 20, which are electrically connected. The light-emitting control circuit 10 provides a light-emitting control signal EM to the light-emitting module 20. Optionally, the light-emitting control circuit 10 may be located in the non-display area NA of the display device 000, and the light-emitting module 20 may be a part of the pixel circuit located in the display area AA of the display device 000. The light-emitting control circuit 10 provides clock signals, VGH, VGL, etc., to the light-emitting control circuit 10 through a display driver chip such as DDIC, so that the light-emitting control circuit 10 generates a light-emitting control signal EM to the control terminal of the light-emitting module 20 in the pixel circuit of the display area AA, thereby controlling the conduction and shutdown of the light-emitting module 20, and driving the light-emitting element of the display area AA to emit light or not. This embodiment does not elaborate on the structure of the display device 000; for details, please refer to the structure of the display device in related technologies for understanding.

[0050] If the target brightness exceeds the second preset dimming brightness threshold, the display device switches to DC dimming mode. Figure 3 As shown, in DC dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N2. Optionally, N2 is generally 1 or 2, preferably N2 is 1, that is, the light emission control circuit 10 controls the number of pulses of the light emission control signal within one frame of the display screen to be 1 pulse.

[0051] As the PWM frequency increases, the number of luminous control signal EM pulses in PWM dimming mode also increases, while the luminous control signal EM in DC dimming mode is generally 1 pulse or 2 pulses. This results in a high number of luminous control signal EM pulses in PWM dimming mode, while the number of luminous control signal EM pulses remains unchanged in DC dimming mode. Therefore, when the dimming mode of the display device switches from PWM dimming mode to DC dimming mode, the luminous control circuit 10 controls the luminous control signal EM in one frame of the display screen to change from multi-pulse coupled luminous emission to single-pulse DC luminous emission. The difference in luminous current causes a significant brightness change; and the higher the number of luminous control signal EM pulses, the more obvious the brightness change.

[0052] The light emission control signal EM provided by the light emission control circuit 10 is an electrical signal that controls the light emission of light-emitting elements such as OLED devices in the display device. For the light emission module 20, which includes P-type transistors, the light emission element emits light when the light emission control signal EM is pulled low. A single frame of display may have 1 to N pulses of the light emission control signal EM, corresponding to 1-N EMpulses. In PWM dimming mode, the light emission current of the light emission element is usually less than that in DC dimming mode. Assuming that before switching from PWM dimming mode to DC dimming mode, the light emission control signal EM provided by the light emission control circuit 10 has N1 EM pulses, and in DC dimming mode, the light emission control signal EM provided by the light emission control circuit 10 has N2 EM pulses (i.e., 1 EMpulse), the more EM pulses in PWM dimming mode (i.e., the larger the value of N1), the longer the light emission time, and the smaller the required light emission current of the light emission element. Therefore, when switching between PWM dimming mode and DC dimming mode, the larger the current difference, the easier it is for a sudden change in brightness to occur.

[0053] To address the aforementioned issues, this embodiment further includes a transitional dimming mode for the display device's dimming mode. This transitional dimming mode operates between PWM dimming and DC dimming modes. If the target brightness is less than or equal to a second preset dimming brightness threshold, and the target brightness is greater than or equal to a first preset dimming brightness threshold, the display device's dimming mode is the transitional dimming mode. Figure 3 As shown, in the transition dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM in one frame of the display screen to be N3, where N2 < N3 < N1. That is, in the transition dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM in one frame of the display screen to transition between N1 and N2. This adds a transition dimming mode to facilitate the transition when the display device switches between PWM dimming mode and DC dimming mode. For example, before the dimming mode of the display device switches from PWM dimming mode to DC dimming mode, the transition dimming mode is executed first. The light emission control circuit 10 controls the light emission control signal EM in one frame of the display screen to first transition from multi-pulse coupled light emission to a transition dimming mode with the number of pulses of the light emission control signal EM being N3, and then switches from the transition dimming mode with the number of pulses of the light emission control signal EM being N3 to the DC dimming mode with the number of pulses of the light emission control signal EM being N2. During the switching process between PWM dimming mode and DC dimming mode, the display device adds a transition dimming mode. The number of pulses N3 of the light emission control signal EM in the transition dimming mode is between the number of pulses N1 of the light emission control signal EM in the PWM dimming mode and the number of pulses N2 of the light emission control signal EM in the DC dimming mode. This can avoid brightness abrupt changes caused by differences in light emission current, reduce instantaneous brightness abrupt changes during dimming, effectively improve visual effects, and ensure the display effect of the display device.

[0054] In related technologies, to improve the problem of brightness abrupt changes during display dimming, some methods involve adjusting the duty cycle of the light emission control signal, such as adjusting the duty cycle transition of the light emission control signal to improve brightness abrupt changes; others involve increasing the width of the porch area (the porch area is a virtual space during screen driving, which does not physically exist, but it participates in the normal driving of the screen) to reduce the brightness difference between PWM dimming mode and DC dimming mode, thus reducing brightness abrupt changes. However, with a fixed screen refresh rate, increasing the number of rows in the porch area will lead to a decrease in the charging time of each row of pixels, which will significantly reduce the effective time of a row of pixels, affecting the charging time and thus affecting display quality. Improving brightness abrupt changes by adjusting the duty cycle transition of the light emission control signal is relatively complex. Existing experiments have found that as the number of light emission control signal EMpulse increases, adjusting the duty cycle transition of the light emission control signal EM, even to its limit, cannot improve the flickering problem caused by brightness abrupt changes during switching.

[0055] Therefore, the dimming mode of the display device provided in this embodiment adds a transition dimming mode, which operates between PWM dimming mode and DC dimming mode. If the target brightness is less than the first preset dimming brightness threshold, the dimming mode of the display device is PWM dimming mode. In PWM dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM in one frame of the display device to be N1. If the target brightness is less than or equal to the second preset dimming brightness threshold, and the target brightness is greater than or equal to the first preset dimming brightness threshold, the dimming mode of the display device is transition dimming mode. In transition dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM in one frame of the display device to be N3. If the target brightness is greater than the second preset dimming brightness threshold, the dimming mode of the display device is DC dimming mode. In DC dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM in one frame of the display device to be N3. The control circuit 10 controls the number of pulses of the light emission control signal EM within a single frame of display to be N2; setting N2 < N3 < N1, in the transition dimming mode, the light emission control circuit 10 controls the number of pulses N3 of the light emission control signal EM within a single frame of display to transition between N1 and N2. By directly adjusting the transition of the number of pulses of the light emission control signal EM within a single frame of display, the number of pulses of the light emission control signal EM can be set directly and flexibly without being limited to the complex adjustment of the duty cycle. This avoids brightness abrupt changes caused by differences in light emission current, reduces instantaneous brightness abrupt changes during dimming, effectively improves visual effects, ensures the display effect of the display device, and also helps to simplify the dimming steps, reduce the complexity of the dimming process, and improve the driving performance of the display device.

[0056] It should be noted that in this embodiment... Figure 3In the above, the number of pulses of the light emission control signal EM in a frame of display screen of display device 000 in PWM dimming mode, DC dimming mode and transition dimming mode is only an example. In actual implementation, it is only necessary to satisfy N2 < N3 < N1 so that display device 000 can transition through transition dimming mode during the switching process between DC dimming mode and PWM dimming mode.

[0057] It is understood that in this embodiment, in the transition dimming mode, the number of pulses of the light emission control signal EM can be different or the same for different frames of the displayed image. For example, before the display device switches from PWM dimming mode to DC dimming mode, the number of pulses of the light emission control signal EM can gradually decrease in different frames of the displayed image in the transition dimming mode; or before the display device switches from DC dimming mode to PWM dimming mode, the number of pulses of the light emission control signal EM can gradually increase in different frames of the displayed image in the transition dimming mode, as long as the number of pulses N3 of the light emission control signal EM in one frame of the displayed image in the transition dimming mode is between N2 and N1.

[0058] Optionally, in this embodiment, if the target brightness of the display device is less than the first preset dimming brightness threshold, the dimming mode of the display device is PWM dimming mode; if the target brightness is greater than the second preset dimming brightness threshold, the dimming mode of the display device is DC dimming mode. In this embodiment, there is no limitation on the first preset dimming brightness threshold and the second preset dimming brightness threshold. It is only necessary to satisfy that the first preset dimming brightness threshold is less than the second preset dimming brightness threshold so that the display device uses PWM dimming mode when the brightness is low and DC dimming mode when the brightness is high.

[0059] In some alternative embodiments, please refer to the references. Figure 1 , Figure 2 and Figure 4 , Figure 4 This is another timing diagram of the light emission control circuit controlling the light emission control signal in a frame of display in different dimming modes in the dimming method provided in this embodiment. In this embodiment, when the PWM dimming mode is switched to the DC dimming mode, the transition dimming mode includes multiple first transition dimming periods.

[0060] During the nth first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (n) ;

[0061] During the (n+1)th first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (n+1) n is a positive integer;

[0062] The (n+1)th first transition dimming period is executed after the nth first transition dimming period, N3 (n+1) <N3 (n) .

[0063] Optional, 1≤N3 (n) -N3 (n+1) ≤3.

[0064] This embodiment explains that when the dimming mode of the display device switches from PWM dimming mode at low brightness to DC dimming mode at high brightness, a transition dimming mode is added before the DC dimming mode is executed. The transition dimming mode includes multiple first transition dimming periods. In PWM dimming mode, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N1. In the transition dimming mode, during the nth first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (n) During the (n+1)th first transition dimming period, the number of pulses of the luminous control signal EM controlled by the luminous control circuit 10 within one frame of the display image is N3. (n+1) N3 (n+1) <N3 (n) For example, during multiple first transition dimming periods in transition dimming mode, during the first first transition dimming period, the number of pulses of the luminous control signal EM controlled by the luminous control circuit 10 within one frame of the display image is N3. (1) During the second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (2) During the third transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (3) ..., during the nth first transition dimming period, the number of pulses of the light emission control signal EM controlled by the light emission control circuit 10 within one frame of the display image is N3. (n) During the (n+1)th first transition dimming period, the number of pulses of the luminous control signal EM controlled by the luminous control circuit 10 within one frame of the display image is N3. (n+1) Then N3 (1) >N3 (2) >N3 (3) >...>N3 (n) >N3 (n+1) ...In this embodiment, before the display device switches from PWM dimming mode to DC dimming mode, during multiple first transition dimming periods in the transition dimming mode, the number of pulses of the light emission control signal EM gradually decreases, and 1 ≤ N3. (n) -N3 (n+1)≤3, during the first transition dimming period of two adjacent executions, the number of pulses of the light emission control signal EM during the second execution of the first transition dimming period is 1-3 fewer than the number of pulses of the light emission control signal EM during the first execution of the first transition dimming period. This allows for a gradual transition to DC dimming mode, which can avoid brightness abrupt changes caused by differences in light emission current, reduce instantaneous brightness abrupt changes during dimming, effectively improve visual effects, and ensure the display effect of the display device.

[0065] For further options, please refer to the reference. Figure 1 , Figure 2 and Figure 5 , Figure 5 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of a display image under different dimming modes in the dimming method provided in this embodiment. In this embodiment, during the (n-1)th first transition dimming period, the number of pulses of the light emission control signal EM within a single frame of a display image controlled by the light emission control circuit 10 is N3. (n-1) Among them, N3 (n) -N3 (n+1) =N3 (n-1) -N3 (n) .

[0066] In this embodiment, before the display device switches from PWM dimming mode to DC dimming mode, during multiple first transition dimming periods in the transition dimming mode, the number of pulses of the light emission control signal EM gradually decreases, and 1 ≤ N3. (n) -N3 (n+1) =N3 (n-1) -N3 (n) ≤3, during two adjacent first transition dimming periods, the number of pulses in the luminance control signal EM during the latter first transition dimming period is 1-3 fewer pulses than the number of pulses in the luminance control signal EM during the former first transition dimming period, and the number of pulses reduced in the luminance control signal EM during the two adjacent first transition dimming periods can be the same, such as... Figure 5 As shown, N3 (n) -N3 (n+1) =N3 (n-1) -N3 (n) =1, by uniformly adjusting the number of EM pulses in the light emission control signal, the transition to DC dimming mode can be gradually achieved. This avoids sudden brightness changes caused by differences in light emission current, reduces instantaneous brightness changes during dimming, effectively improves visual effects, ensures the display effect of the display device, and also improves the uniformity of display brightness.

[0067] It is understood that in this embodiment Figure 5This is merely an example illustrating the number of pulses of the luminance control signal EM during multiple first transition dimming periods in a transition dimming mode. In actual implementation, the number of pulses reduced by the luminance control signal EM during two adjacent first transition dimming periods can be the same, either by 2 pulses or 3 pulses, as long as the number of pulses reduced by the luminance control signal EM during two adjacent first transition dimming periods is the same.

[0068] In some alternative embodiments, please refer to the references. Figure 1 , Figure 2 and Figure 6 , Figure 6 This is another timing diagram of the control of the light emission control circuit in a display frame by the light emission control signal under different dimming modes in the dimming method provided in this embodiment. In this embodiment, when the DC dimming mode is switched to the PWM dimming mode, the transition dimming mode includes multiple second transition dimming periods.

[0069] During the m-th second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (m) ;

[0070] During the (m+1)th second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (m+1) m is a positive integer;

[0071] The (m+1)th second transition dimming period is executed after the mth second transition dimming period, N3 (m+1) >N3 (m) .

[0072] Optional, 1≤N3 (m+1) -N3 (m) ≤3.

[0073] This embodiment explains that when the dimming mode of the display device switches from a high-brightness DC dimming mode to a low-brightness PWM dimming mode, a transition dimming mode is added before the PWM dimming mode is executed. This transition dimming mode includes multiple second transition dimming periods. In the DC dimming mode, the light-emitting control circuit 10 controls the number of pulses of the light-emitting control signal EM within one frame of the display screen to be N3. In the transition dimming mode, during the m-th second transition dimming period, the light-emitting control circuit 10 controls the number of pulses of the light-emitting control signal EM within one frame of the display screen to be N3. (m) During the (m+1)th second transition dimming period, the number of pulses of the light emission control signal EM controlled by the light emission control circuit 10 within one frame of the display image is N3. (m+1) N3 (m+1) >N3 (m)For example, during multiple second transition dimming periods in transition dimming mode, during the first second transition dimming period, the number of pulses of the luminous control signal EM controlled by the luminous control circuit 10 within one frame of the display image is N3. (1) During the second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (2) During the third transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (3) ..., during the m-th second transition dimming period, the number of pulses of the light emission control signal EM controlled by the light emission control circuit 10 within one frame of the display image is N3. (m) During the (m+1)th second transition dimming period, the number of pulses of the light emission control signal EM controlled by the light emission control circuit 10 within one frame of the display image is N3. (m+1) Then N3 (1) <N3 (2) <N3 (3) <...<N3 (m) <N3 (m+1) ...In this embodiment, before the display device switches from DC dimming mode to PWM dimming mode, during multiple second transition dimming periods in the transition dimming mode, the number of pulses of the light emission control signal EM gradually increases, and 1 ≤ N3. (m+1) -N3 (m) ≤3, during two adjacent second transition dimming periods, the number of pulses of the light emission control signal EM during the second transition dimming period is 1-3 more than the number of pulses of the light emission control signal EM during the previous second transition dimming period. This allows for a gradual transition to PWM dimming mode, avoiding sudden brightness changes caused by differences in light emission current, reducing instantaneous brightness changes during dimming, effectively improving visual effects, and ensuring the display effect of the display device.

[0074] For further options, please refer to the reference. Figure 1 , Figure 2 and Figure 7 , Figure 7 This is another timing diagram illustrating how the light emission control circuit controls the light emission control signal within a single frame of a display image under different dimming modes in the dimming method provided in this embodiment. In this embodiment, during the (m-1)th second transition dimming period, the number of pulses of the light emission control signal controlled by the light emission control circuit 10 within a single frame of a display image is N3. (m-1) Among them, N3 (m+1) -N3 (m) =N3 (m) -N3 (m-1) .

[0075] In this embodiment, before the display device switches from DC dimming mode to PWM dimming mode, during multiple second transition dimming periods in the transition dimming mode, the number of pulses of the light emission control signal EM gradually increases, and 1 ≤ N3. (m+1) -N3 (m) =N3 (m) -N3 (m-1) ≤3, during two adjacent executions of the second transition dimming period, the number of pulses of the light emission control signal EM in the later execution of the second transition dimming period is 1-3 more pulses than the number of pulses of the light emission control signal EM in the previous execution of the second transition dimming period, and the number of pulses reduced by the light emission control signal EM during the two adjacent executions of the second transition dimming period can be the same, such as Figure 7 As shown, N3 (m+1) -N3 (m) =N3 (m) -N3 (m-1) =1, by uniformly adjusting the number of EM pulses in the light emission control signal, the transition to DC dimming mode can be gradually achieved. This avoids sudden brightness changes caused by differences in light emission current, reduces instantaneous brightness changes during dimming, effectively improves visual effects, ensures the display effect of the display device, and also improves the uniformity of display brightness.

[0076] It is understood that in this embodiment Figure 7 This is merely an example illustrating the number of pulses of the emission control signal EM during multiple second transition dimming periods in a transition dimming mode. In actual implementation, the number of pulses added to the emission control signal EM during two adjacent executions of the second transition dimming period can be the same, either by 2 pulses or 3 pulses, as long as the number of pulses added to the emission control signal EM during two adjacent executions of the second transition dimming period is the same.

[0077] In some alternative embodiments, please refer to the references. Figures 1-5 , Figure 8 , Figure 8 This is another flowchart illustrating a dimming method for a display device provided in this embodiment. The dimming method for the display device provided in this embodiment includes:

[0078] S20: Obtain the target brightness of the display device;

[0079] S21: The target brightness of the display device is less than the first preset dimming brightness threshold, and the dimming mode of the display device is PWM dimming mode;

[0080] S211: In PWM dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N1; where N1 is a positive integer;

[0081] S22: The target brightness of the display device is less than or equal to the second preset dimming brightness threshold, and the target brightness is greater than or equal to the first preset dimming brightness threshold. The dimming mode of the display device is a transition dimming mode, wherein the first preset dimming brightness threshold is less than the second preset dimming brightness threshold.

[0082] S221: In transition dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N3; where N3 is a positive integer and N3 < N1.

[0083] S222: Transition dimming mode includes multiple first transition dimming periods;

[0084] During the nth first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (n) ;

[0085] During the (n+1)th first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (n+1) n is a positive integer;

[0086] The (n+1)th first transition dimming period is executed after the nth first transition dimming period, N3 (n+1) <N3 (n) And 1≤N3 (n) -N3 (n+1) ≤3.

[0087] S223: Obtain the correspondence between the actual brightness of the display device and the display brightness value DBV of the display device;

[0088] The display brightness value DBV increases from the first display brightness value to the second display brightness value, and the transition dimming mode changes from the nth first transition dimming period to the (n+1)th first transition dimming period.

[0089] S23: The target brightness of the display device is greater than the second preset dimming brightness threshold, and the dimming mode of the display device is DC dimming mode;

[0090] S231: In DC dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N2; where N2 is a positive integer and N2 < N3.

[0091] This embodiment explains that when the dimming mode of the display device switches from PWM dimming mode at low brightness to DC dimming mode at high brightness, a transition dimming mode is added before the DC dimming mode is executed. This transition dimming mode includes multiple first transition dimming periods. During the nth first transition dimming period, the number of pulses of the light emission control signal in one frame of the display image controlled by the light emission control circuit changes to the number of pulses in one frame of the display image controlled by the light emission control circuit during the (n+1)th first transition dimming period. This can change in accordance with the display brightness value (DBV). As the display brightness value (DBV) is adjusted from one value to another, the actual brightness value of the display device also changes. The brightness of the display device can be adjusted using a DBV curve. The DBV curve represents the correspondence between the display brightness value (DBV) and the actual brightness of the display device at a certain gray level. For example, the DBV curve can represent the correspondence between the display brightness value (DBV) and the actual brightness of the display device at 255 gray levels. By obtaining the actual brightness corresponding to a certain gray level of a display brightness value DBV from the DBV curve, a gamma curve corresponding to the display brightness value DBV can be obtained based on the actual brightness corresponding to a certain gray level. The obtained gamma curve can then be used to adjust the brightness of the display device, enabling the display device to display the brightness corresponding to other gray levels under the display brightness value DBV.

[0092] Therefore, when executing the transition dimming mode, the correspondence between the actual brightness of the display device and the display brightness value DBV of the display device can be obtained. The display brightness value DBV increases from the first display brightness value to the second display brightness value, that is, the transition dimming mode changes from the nth first transition dimming period to the (n+1)th first transition dimming period.

[0093] like Figure 9 As shown, Figure 9 This disclosure provides a correspondence between the display brightness value and the number of pulses of the light emission control signal in the transition dimming mode of the display device. In the correspondence between the actual brightness of the display device and its display brightness value DBV, multiple display brightness values ​​DBV are X1, X2, ..., Xn. When X1 increases to X2, the transition dimming mode changes from the first transition dimming period to the second transition dimming period, and the number of pulses of the light emission control signal changes from N3... (1) Change to N3 (2) When X2 increases to X3, the transition dimming mode changes from the second first transition dimming period to the third first transition dimming period, and the number of pulses in the emission control signal changes from N3. (2) Change to N3 (3) ..., Xn changes and increases to Xn+1 (DBV increasing trend is as follows) Figure 9(As shown by the middle arrow G1), the transition dimming mode changes from the nth first transition dimming period to the (n+1)th first transition dimming period, and the number of pulses of the emission control signal changes from N3. (n) Change to N3 (n+1) That is, as the display brightness value (DBV) changes, the number of pulses of the light emission control signal during different first transition dimming periods in the transition dimming mode also changes accordingly. X1 corresponds to N3. (1) X2 corresponds to N3 (2) ..., Xn corresponds to N3 (n) Xn+1 corresponds to N3 (n+1) .

[0094] In this embodiment, during multiple first transition dimming periods of the transition dimming mode, the display device gradually reduces the number of pulses of the light emission control signal in conjunction with the transition of the display brightness value DBV, thereby improving the problem of color brightness flicker. Furthermore, by corresponding the change in the display brightness value with the change in the number of pulses of the light emission control signal, the effect of sequential dimming is achieved, thereby effectively reducing the instantaneous brightness change during the dimming process, improving the visual effect, and ensuring the display effect of the display device.

[0095] In some alternative embodiments, please refer to the references. Figures 1-3 , Figures 6-7 , Figure 10 , Figure 10 This is another flowchart illustrating a dimming method for a display device provided in this embodiment. The dimming method for the display device provided in this embodiment includes:

[0096] S30: Obtain the target brightness of the display device;

[0097] S31: The target brightness of the display device is greater than the second preset dimming brightness threshold, and the dimming mode of the display device is DC dimming mode;

[0098] S311: In DC dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N2; where N2 is a positive integer.

[0099] S32: The target brightness of the display device is less than or equal to the second preset dimming brightness threshold, and the target brightness is greater than or equal to the first preset dimming brightness threshold. The dimming mode of the display device is a transition dimming mode, wherein the first preset dimming brightness threshold is less than the second preset dimming brightness threshold.

[0100] S321: In transition dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N3; where N3 is a positive integer and N3 > N2.

[0101] S322: Transition dimming mode includes multiple second transition dimming periods;

[0102] During the m-th second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (m) ;

[0103] During the (m+1)th second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (m+1) m is a positive integer;

[0104] The (m+1)th second transition dimming period is executed after the mth second transition dimming period, N3 (m+1) >N3 (m) And 1≤N3 (m+1) -N3 (m) ≤3.

[0105] S323: Obtain the correspondence between the actual brightness of the display device and the display brightness value DBV of the display device;

[0106] The display brightness value DBV decreases from the third display brightness value to the fourth display brightness value, and the transition dimming mode changes from the m-th second transition dimming period to the (m+1)-th second transition dimming period.

[0107] S33: The target brightness of the display device is less than the first preset dimming brightness threshold, and the dimming mode of the display device is PWM dimming mode;

[0108] S331: In PWM dimming mode, the number of pulses of the light emission control signal controlled by the light emission control circuit in one frame of the display screen is N1; where N1 is a positive integer and N1 > N3.

[0109] This embodiment explains that when the dimming mode of the display device switches from DC dimming mode at high brightness to PWM dimming mode at low brightness, a transition dimming mode is added before the PWM dimming mode is executed. This transition dimming mode includes multiple second transition dimming periods. The number of pulses of the light emission control signal in one frame of the display screen controlled by the light emission control circuit during the m-th second transition dimming period changes to the number of pulses of the light emission control signal in one frame of the display screen controlled by the light emission control circuit during the (m+1)-th second transition dimming period. This can change in accordance with the display brightness value (DBV). As the display brightness value (DBV) is adjusted from one value to another, the actual brightness value of the display device also changes. The brightness of the display device can be adjusted using a DBV curve. The DBV curve represents the correspondence between the display brightness value (DBV) and the actual brightness of the display device at a certain gray level. For example, the DBV curve can represent the correspondence between the display brightness value (DBV) and the actual brightness of the display device at 255 gray levels. By obtaining the actual brightness corresponding to a certain gray level of a display brightness value DBV from the DBV curve, a gamma curve corresponding to the display brightness value DBV can be obtained based on the actual brightness corresponding to a certain gray level. The obtained gamma curve can then be used to adjust the brightness of the display device, enabling the display device to display the brightness corresponding to other gray levels under the display brightness value DBV.

[0110] Therefore, when executing the transition dimming mode, the correspondence between the actual brightness of the display device and the display brightness value DBV of the display device can be obtained. The display brightness value DBV decreases from the third display brightness value to the fourth display brightness value. That is, the transition dimming mode changes from the m-th second transition dimming period to the (m+1)-th second transition dimming period.

[0111] like Figure 11 As shown, Figure 11 This is another correspondence between the display brightness value and the number of pulses of the light emission control signal in the transition dimming mode of the display device provided in this embodiment. In the correspondence between the actual brightness of the display device and the display brightness value DBV of the display device, the multiple display brightness values ​​DBV are X1, X2, ..., Xn respectively; when X1 decreases to X2, the transition dimming mode changes from the first second transition dimming period to the second second transition dimming period, and the number of pulses of the light emission control signal changes from N3. (1) Change to N3 (2) When X2 decreases to X3, the transition dimming mode changes from the second transition dimming period to the third transition dimming period, and the number of pulses in the emission control signal changes from N3. (2) Change to N3 (3) ..., the change of Xn decreases to Xn+1 (DBV decreases as follows) Figure 11(As shown by the middle arrow G2), the transition dimming mode changes from the m-th second transition dimming period to the (m+1)-th second transition dimming period, and the number of pulses of the emission control signal changes from N3. (m) Change to N3 (m+1) That is, as the display brightness value (DBV) changes, the number of pulses of the light emission control signal during different first transition dimming periods in the transition dimming mode also changes accordingly. X1 corresponds to N3. (1) X2 corresponds to N3 (2) ..., Xn corresponds to N3 (m) Xn+1 corresponds to N3 (m+1) .

[0112] In this embodiment, when the display device executes multiple second transition dimming periods of the transition dimming mode, it gradually increases the number of pulses of the light emission control signal in conjunction with the transition of the display brightness value DBV to improve the color brightness flicker problem. Furthermore, by corresponding the change value of the display brightness value with the change value of the number of pulses of the light emission control signal, the effect of sequential dimming is achieved, thereby effectively reducing the instantaneous brightness change during the dimming process, improving the visual effect, and ensuring the display effect of the display device.

[0113] Optionally, in this embodiment, the first preset dimming brightness threshold is less than the second preset dimming brightness threshold, the target brightness of the display device is less than the first preset dimming brightness threshold, and the dimming mode of the display device is PWM dimming mode; if the target brightness of the display device is greater than the second preset dimming brightness threshold, the dimming mode of the display device is DC dimming mode; wherein the first preset dimming brightness threshold can be greater than 0 nit, and the second preset dimming brightness threshold can be less than or equal to 90 nit, that is, the display device uses DC dimming mode under high brightness and PWM dimming mode under low brightness. In actual dimming, the target brightness of the display device can be between 0-90 nits when using PWM dimming mode, and when the target brightness of the display device is above 90 nits, it switches to DC dimming mode. Therefore, in this embodiment, after adding a transition dimming mode, the first preset dimming brightness threshold can be any brightness greater than 0 nits, and the second preset dimming brightness threshold can be any brightness less than or equal to 90 nits. If the first preset dimming brightness threshold is 70 nits and the second preset dimming brightness threshold is 80 nits, the dimming mode of the display device is PWM dimming mode if the target brightness of the display device is less than 70 nits; the dimming mode of the display device is DC dimming mode if the target brightness of the display device is greater than 80 nits; and the dimming mode of the display device is transition dimming mode if the target brightness of the display device is between 70 nits and 80 nits.

[0114] Optionally, the first preset dimming brightness threshold can also be a non-zero brightness close to 0 nits. For example, if the first preset dimming brightness threshold is 5 nits and the second preset dimming brightness threshold is 20 nits, the dimming mode of the display device is PWM dimming mode if the target brightness of the display device is less than 5 nits; if the target brightness of the display device is greater than 20 nits, the dimming mode of the display device is DC dimming mode; if the target brightness of the display device is between 5 nits and 20 nits, the dimming mode of the display device is transition dimming mode. The dimming mode of the display device tends to be almost entirely DC dimming mode, which changes the screen brightness by directly adjusting the voltage or current. The change in brightness is achieved by adjusting the magnitude of the voltage or current, so the brightness adjustment process is very smooth, which is beneficial to the improvement of the display effect.

[0115] In some alternative embodiments, please refer to the references. Figure 1 , Figure 2 and Figure 12 , Figure 12 yes Figure 2 A schematic diagram of the electrical connection structure between the pixel circuit and the light-emitting element. The display device in this embodiment includes a display area AA and a non-display area NA. The display area AA includes a pixel circuit 00 and a light-emitting element 01. The pixel circuit 00 includes a first power supply terminal PVDD, a second power supply terminal PVEE, a driving module 02, and a light-emitting module 20. The driving module 02, the light-emitting module 20, and the light-emitting element 01 are electrically connected between the first power supply terminal PVDD and the second power supply terminal PVEE.

[0116] The non-display area NA includes a light-emitting control circuit 10, the output of which is electrically connected to the control terminal 20A of the light-emitting module 20.

[0117] This embodiment explains that the display device 000 includes a display area AA and a non-display area NA. The display area AA may include multiple sub-pixels of different colors. Each sub-pixel includes a pixel circuit 00 and a light-emitting element 01 that are electrically connected. The pixel circuit 00 includes a first power terminal PVDD, a second power terminal PVEE, a driving module 02, and a light-emitting module 20. The driving module 02, the light-emitting module 20, and the light-emitting element 01 are electrically connected between the first power terminal PVDD and the second power terminal PVEE. The light-emitting module 20 in the pixel circuit 00 is controlled by a light-emitting control circuit 10 located in the non-display area NA surrounding the display area AA. The light-emitting control circuit 10 provides a light-emitting control signal EM to the control terminal 20A of the light-emitting module 20. The display device 000 provides clock signals, VGH, VGL, etc. to the light-emitting control circuit 10 through a display driver chip such as DDIC. This causes the light-emitting control circuit 10 to generate a light-emitting control signal EM to the control terminal 20A of the light-emitting module 20 in the pixel circuit of the display area AA, so as to control the conduction and shutdown of the light-emitting module 20. As a result, a conductive path is formed between the first power terminal PVDD, the driver module 02, the light-emitting element 01, and the second power terminal PVEE, generating a driving current to drive the light-emitting elements 01 of different sub-pixels of the display area AA to emit light, thus completing the display.

[0118] In this embodiment, the number of pulses of the light emission control signal EM controlled by the light emission control circuit 10 varies. The display device 000 provides clock signals, VGH, VGL, etc., to the light emission control circuit 10 via a display driver chip such as DDIC. Therefore, the light emission control signal EM provided by the light emission control circuit 10 can be controlled by the display driver chip to achieve the transition dimming mode required in the above embodiment, where the number of pulses of the light emission control signal within one frame of the display image controlled by the light emission control circuit 10 is N3. The dimming method in this embodiment does not require additional hardware structure to the display device 000, thus saving manufacturing costs. The number of pulses of the light emission control signal EM provided by the light emission control circuit 10 can be adjusted simply through the integrated control of the display driver chip. Therefore, it helps to improve the problem of sudden brightness changes and also helps to save the overall manufacturing cost of the display device.

[0119] It should be noted that in this embodiment... Figure 12 The block diagram only illustrates the structure of pixel circuits such as the driving module and the light-emitting module. In actual implementation, the structure of pixel circuit 00 can be understood by referring to the structure of OLED display panels in related technologies. This embodiment will not elaborate on this.

[0120] In some alternative embodiments, please refer to the references. Figure 1 , Figure 2 , Figure 12 and Figure 13 , Figure 13 Is adopted Figure 1Another schematic diagram of a display device with a dimming method is shown. The display device 000 includes a driver chip 30 and a light-emitting control circuit 10 electrically connected to the driver chip 30.

[0121] The driver chip 30 includes a storage module 301 and a processor module 302;

[0122] Multiple sets of relationship lookup tables are preset. Each set of relationship lookup tables includes the correspondence between multiple different display brightness values ​​DBV of the display device and the number of different pulses of the light emission control signal EM in a frame of display controlled by the light emission control circuit 10 under the transition dimming mode.

[0123] Multiple sets of relationship lookup tables are stored in storage module 301 or processor module 302.

[0124] This embodiment explains that the display device 000 may include a driver chip 30, which may be a display driver chip DDIC. The light-emitting control circuit 10 is electrically connected to the driver chip 30. Optionally, the driver chip 30 may be electrically connected to the bonding area of ​​the display panel included in the display device 000 via a flexible circuit board. The bonding area of ​​the display panel may be electrically connected to the light-emitting control circuit 10 via fan-out lines and peripheral traces, so that the driver chip 30 provides clock signals, VGH, VGL, and other signals to the light-emitting control circuit 10. It is understood that this embodiment does not elaborate on the arrangement structure of the driver chip 30 on the display device 000 and its specific electrical connection relationship with the light-emitting control circuit 10. For details, please refer to the structure of OLED display devices in related technologies.

[0125] The driver chip 30 in this embodiment includes a storage module 301 and a processor module 302. The storage module 301 can be a Flash IC, i.e., a Flash memory chip, especially useful in applications that require storing large amounts of data. The processor module 302 can be an AP (application processor), which is a crucial part for processing and displaying data. In general, the driver section of a display device 000 must include both a storage module 301 and a processor module 302 to store the large amount of driving data used for display. In this embodiment, to achieve the goal of controlling different pulse counts of the light emission control signal EM within a single frame of display during multiple transition dimming periods under transition dimming mode, multiple sets of relationship lookup tables can be preset. Each set of relationship lookup tables includes the correspondence between multiple different display brightness values ​​DBV of the display device 000 and the different pulse counts of the light emission control signal EM within a single frame of display under transition dimming mode. Multiple sets of relationship lookup tables can be stored in the storage module 301 or the processor module 302. The control driver chip 30 adjusts the different pulse counts of the light emission control signal EM, which changes with different display brightness values ​​DBV, in real time according to a set of relationship lookup tables. Then, it controls the output of the light emission control circuit 10 to achieve the transition adjustment of the pulse count of the light emission control signal EM during different transition dimming periods under different transition dimming modes.

[0126] This embodiment uses multiple preset relationship lookup tables, which are pre-stored in the storage module 301 or processor module 302 of the driver chip 30. These tables can be called in real time when needed, and the hardware structure of the display device 000 remains unchanged. Only the multiple preset relationship lookup tables need to be pre-stored in the storage module 301 or processor module 302 when the driver chip 30 is burned in. The manufacturing cost of the display device 000 will not increase, thus helping to save manufacturing costs.

[0127] Optionally, due to the different characteristics of different display devices, it is necessary to preset multiple sets of relationship lookup tables. In actual use, different choices can be made according to different panels. The best set of relationship lookup tables can be selected to execute the transition dimming mode in order to achieve the best visual effect of the display device dimming and ensure display quality.

[0128] Optionally, the relationship lookup table includes multiple display brightness values ​​DBV, which are X1, X2, ..., Xn respectively;

[0129] The relationship table also includes the number of pulses (i.e., pulse count) for multiple light emission control signals EM, where the number of pulses for each EM is N3. (1) N3 (2) ... N3 (n) Where X1 corresponds to N3(1) X2 corresponds to N3 (2) ..., Xn corresponds to N3 (n) .

[0130] This embodiment explains that multiple sets of pre-set relationship lookup tables are stored in the storage module 301 or processor module 302 of the driver chip 30. Each relationship lookup table may include multiple display brightness values ​​(DBV), where the multiple display brightness values ​​(DBV) are X1, X2, ..., Xn. The relationship lookup table also includes the number of pulses (i.e., the number of pulses) of multiple light emission control signals (EM), where the number of pulses of the multiple light emission control signals (EM) is N3. (1) N3 (2) ... N3 (n) Where X1 corresponds to N3 (1) X2 corresponds to N3 (2) ..., Xn corresponds to N3 (n) As shown in Table 1 below, Table 1 is a set of relationship comparison tables illustrating examples of embodiments of this disclosure.

[0131] Table 1:

[0132]

[0133] In Table 1, the first preset dimming brightness threshold is set to 73.5 nits, and the second preset dimming brightness threshold is set to 75 nits. Therefore, when the target brightness of display device 000 is less than 73.5 nits, PWM dimming mode is used; when the target brightness of display device 000 is greater than 75 nits, DC dimming mode is used; and when the target brightness of display device 000 is between 73.5 nits and 75 nits, transition dimming mode is used. In transition dimming mode, the number of pulses (i.e., the number of pulses) of the light emission control signal EM during multiple first transition dimming periods decreases as the display brightness value DBV increases. As shown in Table 1, where the display brightness value DBV's X1 is 1000, and the number of pulses N3 of the light emission control signal EM during the first first transition dimming period... (1) The number of pulses is 36, the display brightness value DBV X2 is 1001, and the number of pulses N3 of the luminance control signal EM during the second first transition dimming period is 1001. (2) The number of pulses is 33, the display brightness value DBV X3 is 1002, and the number of pulses N3 of the emission control signal EM during the third first transition dimming period is 1002. (3)The number of pulses is 30, ... Before switching to DC dimming mode, the display brightness value DBV is 1011. Therefore, the number of pulses of the luminance control signal EM during the last first transition dimming period is 3. After switching to DC dimming mode, the number of pulses N2 of the luminance control signal EM is 1. By setting the relationship table in this way, the number of pulses of the luminance control signal EM of the luminance control circuit 10 can be called to control the number of pulses when a transition dimming mode is needed. This is flexible and convenient, and can effectively improve the problem of sudden brightness changes during dimming mode switching, thus improving display quality.

[0134] In some alternative embodiments, please refer to the references. Figure 2 , Figure 12 , Figure 13 and Figure 14 , Figure 14 This is another timing diagram of the light emission control circuit controlling the light emission control signal in a display frame under different dimming modes in the dimming method provided in this embodiment. In this embodiment, the display device further includes a first automatic interpolation module; optionally, the first automatic interpolation module can be integrated into the driver chip 30 to control the display device 000.

[0135] The multiple first transition dimming periods include a first first transition dimming period and a last first transition dimming period; during the first first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal within one frame of the display screen to be N3. (a) During the final first transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (b) ;

[0136] The first automatic interpolation module is used to determine N3 (a) and N3 (b) During the automatic interpolation to acquire multiple other first transition dimming periods, the light emission control circuit 10 controls the number of pulses of the light emission control signal within a single frame of the display screen.

[0137] Optionally, the interpolation method of the first automatic interpolation module can be as follows: the first automatic interpolation module determines, based on the linear relationship between the display brightness value DBV and the number of pulses of the light emission control signal EM, that during the first first transition dimming period, the display brightness value of the display device 000 is Xa, and the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (a) ; and during the final first transition dimming period, the display brightness value of the display device 000 is determined to be Xb, and the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (b) Among them, such as Figure 15 As shown, Figure 15This is a linear relationship graph between the display brightness value and the number of pulses of the light emission control signal provided in this embodiment of the present disclosure. The horizontal axis of the linear relationship graph is the display brightness value DBV, and the vertical axis is the number of pulses of the light emission control signal EM (EM pulse count).

[0138] The first automatic interpolation module, based on the linear relationship graph, calculates the horizontal coordinate Xa and the vertical coordinate N3. (a) The first starting point P1, the x-coordinate Xb, and the y-coordinate N3 are determined. (b) The first termination point P2 is determined, and the number of pulses of the light emission control signal EM in a frame of display image controlled by the light emission control circuit 10 is automatically interpolated to obtain the number of pulses during the other first transition dimming periods, corresponding to different display brightness values ​​DBV.

[0139] This embodiment explains that before the display device 000 switches from a low-brightness PWM dimming mode to a high-brightness DC dimming mode, a transition dimming mode can be added. The number of pulses of the light emission control signal EM during the multiple first transition dimming periods of this transition dimming mode can be determined without relying on a preset table showing the relationship between the display brightness value DBV and the number of pulses of the light emission control signal EM. Specifically, during the multiple first transition dimming periods, the number of pulses of the light emission control signal controlled by the light emission control circuit in the nth first transition dimming period changes to the number of pulses controlled by the light emission control circuit in the (n+1)th first transition dimming period. This can change with the display brightness value DBV. However, it is only necessary to determine the number of pulses of the light emission control signal EM controlled by the light emission control circuit 10 in the first first transition dimming period and the number of pulses controlled by the light emission control circuit 10 in the last first transition dimming period. The number of pulses of the light emission control signal EM in the remaining first transition dimming periods can be obtained through automatic interpolation. The display device 000 includes a first automatic interpolation module, which can be integrated into the driver chip 30 to control the display device 000. The display brightness value DBV has a linear relationship with the number of pulses of the light emission control signal EM, as shown in the linear relationship diagram. Figure 15 As shown, the horizontal axis represents the display brightness value DBV, and the vertical axis represents the number of pulses (EMpulse) of the luminance control signal EM. Based on this linear relationship graph, the first automatic interpolation module determines that during the first transition dimming period, the display brightness value of the display device 000 is Xa, and the luminance control circuit 10 controls the number of pulses of the luminance control signal EM within one frame of the display screen to be N3. (a) x-axis Xa and y-axis N3 (a)The first starting point is determined; based on the linear relationship graph, the first automatic interpolation module determines that during the last first transition dimming period, the display brightness value of the display device 000 is Xb, and the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (b) x-axis Xb and y-axis N3 (b) Once the first termination point is determined, the number of pulses of the light emission control signal EM corresponding to different display brightness values ​​DBV during the other multiple first transition dimming periods can be obtained through automatic interpolation. The dimming method of the transition dimming mode in this embodiment only requires presetting the number of pulses of the light emission control signal EM corresponding to the display brightness values ​​DBV at the beginning and end of the first transition dimming periods. The first automatic interpolation module automatically interpolates the number of pulses of the light emission control signal EM during the intermediate first transition dimming periods. It does not require presetting the number of pulses of the light emission control signal EM during the multiple first transition dimming periods in the intermediate states, which helps save the driving power consumption of the driver chip and thus reduces the overall driving power consumption of the display device.

[0140] It is understood that this embodiment Figure 15 The linear relationship between the display brightness value DBV and the number of pulses of the luminance control signal EM in the transition dimming mode is only an example. It is only used to illustrate that in the transition dimming mode added during the process of the display device 000 switching from PWM dimming mode to DC dimming mode, during multiple first transition dimming periods, as the display brightness value DBV increases, the number of pulses of the luminance control signal EM controlled by the luminance control circuit 10 in one frame of display screen decreases linearly. In specific implementation, the above linear relationship diagram can be set according to the actual situation.

[0141] In some alternative embodiments, please refer to the references. Figure 2 , Figure 12 , Figure 13 and Figure 16 , Figure 16 This is another timing diagram of the light emission control circuit controlling the light emission control signal in a display frame under different dimming modes in the dimming method provided in this embodiment. In this embodiment, the display device 000 also includes a second automatic interpolation module; optionally, the second automatic interpolation module can be integrated into the driver chip 30 to control the display device 000.

[0142] Multiple second transition dimming periods include a first second transition dimming period and a last second transition dimming period. During the first second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (c)During the final second transition dimming period, the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display image to be N3. (d) ;

[0143] The second automatic interpolation module is used to determine N3 (c) and N3 (d) During the automatic interpolation to acquire multiple other second transition dimming periods, the light emission control circuit 10 controls the number of pulses of the light emission control signal within a single frame of the display screen.

[0144] Optionally, the interpolation method of the second automatic interpolation module can be as follows: the second automatic interpolation module determines, based on the linear relationship between the display brightness value DBV and the number of pulses of the luminance control signal EM, that during the first second transition dimming period, the display brightness value of the display device 000 is Xc, and the luminance control circuit 10 controls the number of pulses of the luminance control signal EM within one frame of the display screen to be N3. (c) ; and during the final second transition dimming period, the display brightness value of the display device 000 is determined to be Xd, and the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (d) Among them, such as Figure 17 As shown, Figure 17 This is another linear relationship graph between the display brightness value and the number of pulses of the light emission control signal provided in this embodiment of the present disclosure. The horizontal axis of the linear relationship graph is the display brightness value DBV, and the vertical axis is the number of pulses of the light emission control signal EM (EM pulse count).

[0145] The second automatic interpolation module, based on the linear relationship graph, calculates the horizontal axis Xc and the vertical axis N3. (c) The determined second starting point P3, x-coordinate Xd, and y-coordinate N3 (d) The determined second termination point P4 is used to automatically interpolate and obtain the number of pulses of the light emission control signal EM in a frame of display image controlled by the light emission control circuit 10 during other second transition dimming periods, corresponding to different display brightness values ​​DBV.

[0146] This embodiment explains that before the display device 000 switches from a high-brightness DC dimming mode to a low-brightness PWM dimming mode, a transition dimming mode can be added. The number of pulses of the luminance control signal EM during the multiple second transition dimming periods of this transition dimming mode can be determined without relying on a preset table showing the relationship between the display brightness value DBV and the number of pulses of the luminance control signal EM. Specifically, during the multiple second transition dimming periods, the number of pulses of the luminance control signal controlled by the luminance control circuit in the m-th second transition dimming period changes to the number of pulses controlled by the luminance control circuit in the (m+1)-th second transition dimming period, which can change with the display brightness value DBV. However, it is only necessary to determine the number of pulses of the luminance control signal EM controlled by the luminance control circuit 10 in the first and last second transition dimming periods; the number of pulses of the luminance control signal EM in the remaining second transition dimming periods can be obtained through automatic interpolation. The display device 000 includes a second automatic interpolation module, which can be integrated into the driver chip 30 to control the display device 000. The display brightness value DBV has a linear relationship with the number of pulses of the light emission control signal EM, as shown in the linear relationship diagram. Figure 17 As shown, the horizontal axis represents the display brightness value DBV, and the vertical axis represents the number of pulses (EMpulse count) of the luminance control signal EM. Based on this linear relationship graph, the second automatic interpolation module determines that during the first second transition dimming period, the display brightness value of the display device 000 is Xc, and the luminance control circuit 10 controls the number of pulses of the luminance control signal EM within one frame of the display image to be N3. (c) The x-axis Xc and the y-axis N3 (c) The second starting point is determined; based on the linear relationship graph, the second automatic interpolation module determines that during the last second transition dimming period, the display brightness value of the display device 000 is Xd, and the light emission control circuit 10 controls the number of pulses of the light emission control signal EM within one frame of the display screen to be N3. (d) The horizontal axis Xd and the vertical axis N3 (d)Once the second termination point is determined, the number of pulses of the light emission control signal EM within a single frame controlled by the light emission control circuit 10, corresponding to different display brightness values ​​DBV during the other multiple second transition dimming periods, can be obtained through automatic interpolation. The dimming method of the transition dimming mode in this embodiment only requires presetting the number of pulses of the light emission control signal EM corresponding to the display brightness values ​​DBV at the beginning and end of the second transition dimming periods. The second automatic interpolation module automatically interpolates the number of pulses of the light emission control signal EM during the intermediate second transition dimming periods. It does not require presetting the number of pulses of the light emission control signal EM during the multiple second transition dimming periods in the intermediate states, which helps save the driving power consumption of the driver chip and thus reduces the overall driving power consumption of the display device.

[0147] It is understood that this embodiment Figure 17 The linear relationship between the display brightness value DBV and the number of pulses of the luminance control signal EM in the transition dimming mode is only an example. It is only used to illustrate that in the transition dimming mode added during the process of switching the display device 000 from DC dimming mode to PWM dimming mode, during multiple second transition dimming periods, as the display brightness value DBV decreases, the number of pulses of the luminance control signal EM controlled by the luminance control circuit 10 in one frame of display screen increases linearly. In specific implementation, the above linear relationship diagram can be set according to the actual situation.

[0148] Optional, such as Figure 2 , Figure 12 , Figure 13 and Figure 14 , Figure 16 As shown, in this embodiment, the light emission control circuit 10 controls the pulse width of the light emission control signal EM to be the same within one frame of the display image. That is, in the transition dimming mode provided in this embodiment, during multiple different first transition dimming periods and multiple different second transition dimming periods, only the number of pulses of the light emission control signal EM is adjusted, without the need to adjust the pulse width of the light emission control signal EM. The pulse width of the light emission control signal EM is the same, which makes the adjustment method of the transition dimming mode more intuitive and flexible. The number of pulses of the light emission control signal EM can be set directly and flexibly without the need for complex adjustments to the duty cycle. This can effectively improve the visual effect, avoid sudden brightness changes, and also help simplify the dimming steps and reduce the complexity of the dimming process.

[0149] In some alternative embodiments, this embodiment also provides a display device as described above. Figure 2 or Figure 13As shown, the display device uses the dimming method of any of the above embodiments for dimming. It is understood that the display device provided in this embodiment can be other display devices with display functions, such as computers, televisions, and vehicle-mounted display devices; the present invention does not impose specific limitations on these. The display device provided in this embodiment has the beneficial effects of display devices using the above dimming methods; for details, please refer to the specific descriptions of the above embodiments, which will not be repeated here.

[0150] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0151] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dimming method for a display device, characterized in that, The dimming method includes: Obtain the target brightness of the display device; If the target brightness is less than a first preset dimming brightness threshold, the dimming mode of the display device is PWM dimming mode; The target brightness is greater than the second preset dimming brightness threshold, and the dimming mode of the display device is DC dimming mode; wherein, the first preset dimming brightness threshold is less than the second preset dimming brightness threshold; The display device includes a light-emitting control circuit and a light-emitting module, the light-emitting control circuit and the light-emitting module are electrically connected, and the light-emitting control circuit is used to provide a light-emitting control signal to the light-emitting module; The display device further includes a transition dimming mode, wherein the target brightness is less than or equal to the second preset dimming brightness threshold and the target brightness is greater than or equal to the first preset dimming brightness threshold, and the dimming mode of the display device is a transition dimming mode, wherein the transition dimming mode is executed between the PWM dimming mode and the DC dimming mode; In the PWM dimming mode, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display screen to be N1; In the DC dimming mode, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display screen to be N2; In the transition dimming mode, the light emission control circuit controls the number of pulses of the light emission control signal in one frame of the display screen to be N3; where N1, N2, and N3 are all positive integers, and N2 < N3 < N1; When the PWM dimming mode is switched to the DC dimming mode, the transition dimming mode includes a plurality of first transition dimming periods; The display device further includes a first automatic interpolation module; The plurality of first transition dimming periods includes a first first transition dimming period and a last first transition dimming period; during the first first transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (a) During the last of the first transition dimming periods, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (b) ; The first automatic interpolation module is used to determine N3 (a) and N3 (b) During the automatic interpolation to acquire multiple other first transition dimming periods, the light emission control circuit controls the number of pulses of the light emission control signal within a single frame of the display screen.

2. The dimming method for a display device according to claim 1, characterized in that, During the nth first transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (n) ; During the (n+1)th first transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (n+1) n is a positive integer; The (n+1)th first transition dimming period is executed after the nth first transition dimming period, N3 (n+1) <N3 (n) .

3. The dimming method for a display device according to claim 2, characterized in that, 1 ≤ N3 (n) -N3 (n+1) ≤3.

4. The dimming method for a display device according to claim 2, characterized in that, During the (n-1)th first transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (n-1) ; in, N3 (n) -N3 (n+1) =N3 (n-1) -N3 (n) 。 5. The dimming method for a display device according to claim 1, characterized in that, When the DC dimming mode is switched to the PWM dimming mode, the transition dimming mode includes multiple second transition dimming periods; During the m-th second transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (m) ; During the (m+1)th second transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (m+1) m is a positive integer; The (m+1)th second transition dimming period is executed after the mth second transition dimming period, N3 (m+1) >N3 (m) .

6. The dimming method for a display device according to claim 5, characterized in that, 1 ≤ N3 (m+1) -N3 (m) ≤3.

7. The dimming method for a display device according to claim 5, characterized in that, During the (m-1)th second transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (m-1) ; in, N3 (m+1) -N3 (m) =N3 (m) -N3 (m-1) 。 8. The dimming method for a display device according to claim 1, characterized in that, N2 = 1; or, N2 = 2.

9. The dimming method for a display device according to claim 2, characterized in that, Obtain the correspondence between the actual brightness of the display device and the display brightness value of the display device; The display brightness value increases from a first display brightness value to a second display brightness value, and the transition dimming mode changes from the nth first transition dimming period to the (n+1)th first transition dimming period.

10. The dimming method for a display device according to claim 5, characterized in that, Obtain the correspondence between the actual brightness of the display device and the display brightness value of the display device; The display brightness value decreases from the third display brightness value to the fourth display brightness value, and the transition dimming mode changes from the m-th second transition dimming period to the (m+1)-th second transition dimming period.

11. The dimming method for a display device according to claim 1, characterized in that, The first preset dimming brightness threshold is greater than 0 nits, and the second preset dimming brightness threshold is less than or equal to 90 nits.

12. The dimming method for a display device according to claim 1, characterized in that, The display device includes a display area and a non-display area. The display area includes a pixel circuit and a light-emitting element. The pixel circuit includes a first power terminal, a second power terminal, a driving module, and the light-emitting module. The driving module, the light-emitting module, and the light-emitting element are electrically connected between the first power terminal and the second power terminal. The non-display area includes the light-emitting control circuit, and the output terminal of the light-emitting control circuit is electrically connected to the control terminal of the light-emitting module.

13. The dimming method for a display device according to claim 1, characterized in that, The display device includes a driver chip, and the light-emitting control circuit is electrically connected to the driver chip. The driver chip includes a storage module and a processor module; Multiple sets of relationship lookup tables are preset. Each set of relationship lookup tables includes the correspondence between multiple different display brightness values ​​of the display device and the number of different pulses of the light emission control signal controlled by the light emission control circuit in a frame of display under the transition dimming mode. Multiple sets of the aforementioned relationship lookup tables are stored in the storage module or the processor module.

14. The dimming method for a display device according to claim 13, characterized in that, The relationship lookup table includes multiple display brightness values, which are X1, X2, ..., Xn respectively; The relationship lookup table also includes the pulse count of multiple light emission control signals, where the pulse count of the multiple light emission control signals is N3. (1) N3 (2) ... N3 (n) ; Where X1 corresponds to N3 (1) X2 corresponds to N3 (2) ..., Xn corresponds to N3 (n) .

15. The dimming method for a display device according to claim 13, characterized in that, Based on the visual effect of the display device, a set of the relationship lookup tables is selected to execute the transition dimming mode.

16. The dimming method for a display device according to claim 1, characterized in that, The first automatic interpolation module determines, based on the linear relationship between the display brightness value and the number of pulses of the light emission control signal, that during the first first transition dimming period, the display brightness value of the display device is Xa, and the number of pulses of the light emission control signal controlled by the light emission control circuit within one frame of the display image is N3. (a) ; and during the last of the first transition dimming periods, the display brightness value of the display device is Xb, and the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (b) The horizontal axis of the linear relationship graph represents the display brightness value, and the vertical axis represents the number of pulses of the light emission control signal. The first automatic interpolation module, based on the linear relationship graph, uses the horizontal axis Xa and the vertical axis N3... (a) The first starting point, x-coordinate Xb, and y-coordinate N3 are determined. (b) The first termination point is determined, and the number of pulses of the light emission control signal in a frame of display image controlled by the light emission control circuit is automatically interpolated to obtain the number of pulses during the other multiple first transition dimming periods, corresponding to different display brightness values.

17. The dimming method for a display device according to claim 5, characterized in that, The display device further includes a second automatic interpolation module; The plurality of second transition dimming periods includes a first second transition dimming period and a last second transition dimming period. During the first second transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (c) During the last and second transition dimming period, the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (d) ; The second automatic interpolation module is used to determine the relationship between N3 and N3. (c) and N3 (d) During the automatic interpolation to acquire multiple other second transition dimming periods, the light emission control circuit controls the number of pulses of the light emission control signal within a single frame of the display screen.

18. The dimming method for a display device according to claim 17, characterized in that, The second automatic interpolation module determines, based on the linear relationship between the display brightness value and the number of pulses of the light emission control signal, that during the first second transition dimming period, the display brightness value of the display device is Xc, and the number of pulses of the light emission control signal controlled by the light emission control circuit within one frame of the display image is N3. (c) ; and during the last second transition dimming period, the display brightness value of the display device is Xd, and the light emission control circuit controls the number of pulses of the light emission control signal within one frame of the display image to be N3. (d) The horizontal axis of the linear relationship graph represents the display brightness value, and the vertical axis represents the number of pulses of the light emission control signal. The second automatic interpolation module, based on the linear relationship graph, uses the horizontal axis Xc and the vertical axis N3... (c) The determined second starting point, x-coordinate Xd and y-coordinate N3 (d) The determined second termination point is used to automatically interpolate and obtain the number of pulses of the light emission control signal in a frame of display image corresponding to different display brightness values ​​during the other multiple second transition dimming periods.

19. The dimming method for a display device according to claim 1, characterized in that, The light emission control circuit controls the pulse width of the light emission control signal to be the same within a single frame of the display image.

20. A display device, characterized in that, Dimming is performed using the dimming method of the display device according to any one of claims 1-19.

Images