Display control method, display panel, and storage medium

Abstract

The present disclosure provides a display control method, a display panel and a storage medium, and belongs to the technical field of display. The present disclosure obtains a target brightness value currently displayed by a display panel; in a case where the target brightness value is less than a preset brightness threshold, a first pulse width of a first pulse and a second pulse width of a second pulse of a light-emitting control signal in an output stage are determined according to the target brightness value; the output timing of the first pulse is at least before the output timing of one second pulse, and the first pulse width is greater than the second pulse width; in at least one output stage, the first pulse of the light-emitting control signal is controlled to be output according to the first pulse width, and the second pulse of the light-emitting control signal is controlled to be output according to the second pulse width.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a display control method, a display panel, and a storage medium. Background Technology

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

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

[0004] Firstly, the technical solution adopted to solve the technical problem of this disclosure is a display control method, including:

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

[0006] If the target brightness value is less than a preset brightness threshold, the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output stage are determined according to the target brightness value; the output timing of the first pulse is at least one second pulse before the output timing of the second pulse, and the first pulse width is greater than the second pulse width;

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

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

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

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

[0011] The first pulse is the second valid pulse of the light emission control signal in the output stage; the second pulse is the remaining valid pulse of the light emission control signal in the output stage other than the second valid pulse.

[0012] In some embodiments, determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output phase, based on the target brightness value, includes:

[0013] Based on a pre-set first correlation between the display brightness value and each pulse width, the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value are determined.

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

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

[0016] In some embodiments, determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output phase, based on the target brightness value, includes:

[0017] Based on the preset brightness range in which the target brightness value is located, a second correlation relationship is determined corresponding to the preset brightness range; the second correlation relationship represents the correlation between each display brightness value in the preset brightness range and the first preset pulse width difference value; the preset brightness range includes a first range and a second range; the display brightness value in the first range is less than the display brightness value in the second range; in the first range, the first preset pulse width difference value is a fixed value; in the second range, the first preset pulse width difference value decreases monotonically;

[0018] Based on the second correlation, the second target pulse width difference corresponding to the target brightness value is determined;

[0019] Based on a pre-set first correlation between the display brightness value and each pulse width, the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value are determined.

[0020] Based on the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse to obtain the updated first pulse width and second pulse width.

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

[0022] The step of determining the second target pulse width difference value corresponding to the target brightness value based on the second correlation includes:

[0023] When the target brightness value is within the first interval, the second target pulse width difference is determined according to the second correlation represented by the following expression: Y = p, where p takes any number from 35H to 45H; H represents the time for the light emission control signal to scan a row of sub-pixels.

[0024] When the target brightness value is within the second interval, the second target pulse width difference is determined according to the second correlation represented by the following expression two: Expression two: or Where X represents the target brightness value, k takes any number from -0.063 to -0.017, and u takes any number from 43.67H to 81.07H. Indicates rounding up. This indicates rounding down, and Y represents the second target pulse width difference.

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

[0026] The step of determining the second target pulse width difference value corresponding to the target brightness value based on the second correlation includes:

[0027] When the target brightness value is located within the first sub-interval, the second target pulse width difference is determined according to the second correlation represented by Formula 1 below; Formula 1: or

[0028] When the target brightness value is located in the second sub-interval, the second target pulse width difference is determined according to the second correlation represented by Formula 2; Formula 2: or

[0029] When the target brightness value is located within the third sub-interval, the second target pulse width difference is determined according to the second correlation represented by Formula 3; Formula 3: or

[0030] When the target brightness value is located within the fourth sub-interval, the second target pulse width difference is determined according to the second correlation represented by Formula 4; Formula 4: or

[0031] In some embodiments, the light emission control signal includes a plurality of second pulses in the output phase, and the second pulse width of each second pulse is the same.

[0032] In some embodiments, the light emission control signal includes a plurality of second pulses in the output phase, wherein the second pulse width of the second pulse that is output earlier is greater than the second pulse width of the second pulse that is output later.

[0033] In some embodiments, for any output stage, the second pulse width of the second pulse adjacent to the first pulse in the output timing is denoted as the first sub-pulse width, and the second pulse width of the remaining second pulse is denoted as the second sub-pulse width;

[0034] Based on the target brightness value, determining the first pulse width of the first pulse and the first sub-pulse width of the second pulse of the light emission control signal in the output stage includes:

[0035] Based on the preset brightness range in which the target brightness value is located, a second correlation relationship is determined corresponding to the preset brightness range; the second correlation relationship represents the correlation between each display brightness value in the preset brightness range and the first preset pulse width difference value; the preset brightness range includes a first range and a second range; the display brightness value in the first range is less than the display brightness value in the second range; in the first range, the first preset pulse width difference value is a fixed value; in the second range, the first preset pulse width difference value decreases monotonically;

[0036] Based on the second correlation, the second target pulse width difference corresponding to the target brightness value is determined;

[0037] Based on a pre-set first correlation between the display brightness value and each pulse width, the initial pulse width of the first pulse corresponding to the target brightness value and the initial pulse width of the second pulse adjacent to the first pulse are determined.

[0038] Based on the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse adjacent to the first pulse to obtain the updated first pulse width and first sub-pulse width.

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

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

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

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

[0043] Based on the determined second target pulse width difference, a fourth target pulse width difference is determined for any two adjacent second pulses; the fourth target pulse width difference is less than the second target pulse width difference.

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

[0045] In some embodiments, the fourth target pulse width difference between two adjacent second pulses in the output timing sequence is greater than or equal to the fourth target pulse width difference between two adjacent second pulses in the output timing sequence.

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

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

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

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

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

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

[0052] Secondly, embodiments of this disclosure also provide a display panel, which includes a driver and a scanning drive circuit;

[0053] The driver is configured to acquire the target brightness value currently displayed on the display panel; if the target brightness value is less than a preset brightness threshold, determine the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output phase according to the target brightness value; the output timing of the first pulse is at least one second pulse before the output timing of the second pulse, and the first pulse width is greater than the second pulse width;

[0054] The scanning drive circuit is configured to, at least in one of the output stages, control the output of a first pulse of the light emission control signal according to the first pulse width, and control the output of a second pulse of the light emission control signal according to the second pulse width.

[0055] Thirdly, embodiments of this disclosure also provide a computer non-transient readable storage medium, wherein a computer program is stored on the computer non-transient readable storage medium, and the computer program is executed by a processor to perform the steps of the display control method as described in any one of the first aspects. Attached Figure Description

[0056] Figure 1 A flowchart of a display control method provided in an embodiment of this disclosure;

[0057] Figure 2 Example 1, a timing diagram in a first dimming mode, provided for embodiments of this disclosure;

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

[0059] Figure 4 Example 2, a timing diagram in a first dimming mode, provided for embodiments of this disclosure;

[0060] Figure 5 Example 1, provided for embodiments of this disclosure, is a detailed flowchart of determining the first pulse width and the second pulse width;

[0061] Figure 6 This is a schematic diagram illustrating the degree of brightness change corresponding to a display brightness value, provided in an embodiment of this disclosure.

[0062] Figure 7 Example 2, provided for embodiments of this disclosure, is a detailed flowchart of determining the first pulse width and the second pulse width;

[0063] Figure 8 A schematic diagram illustrating a linear representation of the second association relationship provided for embodiments of this disclosure;

[0064] Figure 9 Example 3, a timing diagram in a first dimming mode, provided as an embodiment of this disclosure;

[0065] Figure 10 Example 3, provided for embodiments of this disclosure, is a detailed flowchart of determining the first pulse width and the first sub-pulse width;

[0066] Figure 11 Example 3, provided for embodiments of this disclosure, is a specific flowchart of determining a second sub-pulse width;

[0067] Figure 12 This is a schematic diagram illustrating the degree of brightness change corresponding to another display brightness value provided in an embodiment of this disclosure;

[0068] Figure 13 Another detailed flowchart for determining the second sub-pulse width in Example 3 provided for embodiments of this disclosure;

[0069] Figure 14 Timing diagram of a second dimming mode provided for embodiments of this disclosure;

[0070] Figure 15 A schematic diagram of a display panel provided for an embodiment of this disclosure. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0072] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0073] In this disclosure, "multiple or several" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0074] The transistors used in the embodiments of this disclosure can be thin-film transistors, field-effect transistors, or other devices with the same characteristics. Since the source and drain of the transistors are symmetrical, there is no distinction between them. In the embodiments of this disclosure and the following description, to distinguish the source and drain of the transistor, one of them is called the first electrode, the other is called the second electrode, and the gate is called the control electrode. Furthermore, transistors can be classified into N-type and P-type according to their characteristics. An N-type thin-film transistor refers to a thin-film transistor with N-type ion doping in the active layer; a P-type thin-film transistor refers to a thin-film transistor with P-type ion doping in the active layer. The operating level signal of an N-type thin-film transistor is a high-level signal; the operating level signal of a P-type thin-film transistor is a low-level signal.

[0075] Organic light-emitting diode (OLED) displays possess numerous advantages such as self-illumination and high contrast, making them a promising display technology with broad application prospects. Low-temperature polycrystalline oxide (LTPO) combines the high mobility of LTPO with the low leakage current characteristics of oxides, enabling both high-frequency and low-frequency applications. For example... Figure 3As shown, the second transistor is an LTPO transistor. The current pixel circuit uses the 3P3H timing, a specific timing control method mainly used to optimize the power consumption and refresh rate of OLED displays. In the 3P3H timing, "3P" represents the three pre-charge stages of the pixel circuit, and "3H" represents the three hold stages. By finely controlling the charging and hold of the pixels, unnecessary power consumption is reduced, while improving the screen's refresh rate and display quality. Due to the 3P3H timing control, the light emission control signal is reset three times within one frame, resulting in three complete black cycles on the display panel. This leads to a higher SVM objective value, as shown in Table 1 below. The SVM value before improvement does not meet the user-defined SVM specification (SPEC).

[0076] Table 1

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

[0078] In view of this, embodiments of the present disclosure provide a display control method that optimizes the pulse width of the output pulse of the light emission control signal EM, and verifies that the SVM value can meet the SVM specification (SPEC) used for setting.

[0079] The display control method provided in this disclosure is applied to a display panel. Figure 1 A flowchart of the display control method provided in the embodiments of this disclosure is shown below. Figure 1 As shown, it includes steps S11 to S13.

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

[0081] Here, the target brightness value is the display brightness value (Display BrightnessValue, DBV) currently displayed on the display panel, also known as the DBV value. The display panel's brightness range is 0 to 4095, which translates to a brightness parameter of 0 to 2550 nits.

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

[0083] It should be noted that the display panel can include two dimming modes, referred to as the first dimming mode and the second dimming mode. The pulse frequency of the light emission control signal (EM) differs between the two dimming modes, meaning the number of pulses in the EM signal varies. The frame time is the same for both dimming modes; for example, at a 120Hz refresh rate, the scan time for one frame is approximately 8.333ms. Optionally, the first dimming mode is Pulse Width Modulation (PWM) dimming, which adjusts the pulse width of the light emission control signal (EM) to regulate the brightness of the OLED device. The second dimming mode is Direct Current (DC) dimming, which controls the driving current of the OLED device by adjusting the data voltage output from the driver, thereby achieving brightness adjustment.

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

[0085] like Figure 2 As shown, output stage t1 is the stage between two adjacent reset stages in the working timing of the pixel circuit. The pixel circuit is the driving circuit in the display panel used to drive the OLED light-emitting device to emit light. Taking the light emission control signal EM as an example, output stage t1 of the light emission control signal EM is the stage between two adjacent reset stages t2 in the working timing of the light emission control signal EM. Here, reset stage t2 refers to the pre-charge stage represented by "3P" and the hold stage represented by "3H" in the 3P3H timing. For example, Figure 3As shown, "P" can also be understood as the first reset signal (Reset_P) used to reset the gate of the driving transistor T3 in the pixel circuit, and "H" can also be understood as the second reset signal (Reset_H) used to multiplex the source of the driving transistor T3 and the anode of the OLED light-emitting device in the pixel circuit. The light-emitting control signal EM refers to the signal used to drive the light-emitting control transistors T5 and T6 to turn on and off. The first reset signal (Reset_P) refers to the signal used to drive the first reset transistor T1 to turn on and off. The second reset signal (Reset_H) refers to the signal used to drive the second reset transistors T7 and T8 to turn on and off. The output stage t1 includes multiple output sub-stages, and a valid light-emitting control signal EM is output in each output sub-stage. The so-called "valid" light-emitting control signal EM refers to the signal that can turn on the light-emitting control transistors T5 and T6. Due to the influence of the characteristics of the light-emitting control transistors, it may be a high level or a low level. This disclosure takes the example that the light-emitting control transistors T5 and T6, the first reset transistor T1, and the second reset transistors T7 and T8 are all P-type transistors, that is, the valid signals are all low-level signals. For example, Figure 2 As shown, a frame of operation includes three reset stages t2 (i.e., three resets within one frame) and three output stages t1. Each output stage t1 includes four output sub-stages, with each sub-stage corresponding to either a first pulse 10 or a second pulse 20. The first pulse 10 and the second pulse 20 in output stage t1 are both valid pulses, meaning they output a valid light emission control signal EM.

[0086] Optionally, the output stage t1 includes at least one first pulse 10 and at least one second pulse 20. For example, as shown... Figure 2 As shown, the output stage t1 includes one first pulse 10 and three second pulses 20. The output timing of the first pulse 10 precedes the output timing of one second pulse 20, and the first pulse width a is greater than the second pulse width b, i.e., a > b. The pulse width is measured in units of time to scan one row of sub-pixels, where a can represent the time to scan a rows of sub-pixels, and b can represent the time to scan b rows of sub-pixels.

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

[0088] Table 2

[0089]

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

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

[0092] The display panel includes a scan driving circuit that is electrically connected to the gates of light-emitting control transistors T5 and T6 in the pixel circuit via light-emitting control signal lines. In at least one output stage, it transmits a light-emitting control signal EM with a first pulse width a and a second pulse width b to the light-emitting control transistors T5 and T6. Subsequently, the pixel circuit can respond to the received light-emitting control signal EM to control the OLED light-emitting device to emit light, thereby achieving display control.

[0093] For example, at any output stage, the first pulse of the light emission control signal is controlled to be output according to the first pulse width, and the second pulse of the light emission control signal is controlled to be output according to the second pulse width.

[0094] This disclosure embodiment optimizes the pulse width of the output pulse of the light emission control signal EM (i.e., a > b), and it has been verified that the SVM value can meet the SVM specification (SPEC) used for setting.

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

[0096] This embodiment optimizes the pulse width of the output pulse of the light emission control signal EM. For example, the first pulse width 'a' of the first valid pulse after reset is greater than the second pulse width 'b' of subsequent valid pulses. This has been verified to ensure that the SVM value meets the SVM specification (SPEC) used for setting.

[0097] In some embodiments, the light emission control signal EM includes a first pulse 10 and at least two second pulses 20; the first pulse 10 is the second valid pulse of the light emission control signal EM in the output phase t1; the second pulses 20 are the remaining valid pulses of the light emission control signal EM in the output phase t1 excluding the second valid pulse. Optionally, the second pulses 20 include multiple pulses, such as... Figure 4 As shown, the second pulse 20 is the first, third, and fourth effective pulses of the light emission control signal EM in the output stage t1.

[0098] This embodiment optimizes the pulse width of the output pulse of the light emission control signal EM. For example, the first pulse width a of the first pulse 10 with the earlier output timing is greater than the second pulse width b of the second pulse 20 with the later output timing. After verification, it can be made so that the SVM value meets the SVM specification (SPEC) used for setting.

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

[0100] S12-1-1. Based on the preset first correlation between the display brightness value and each pulse width, determine the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value.

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

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

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

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

[0105] Optionally, according to a pre-set first target pulse width difference m, ensuring that the initial pulse width of the second pulse 20 remains unchanged, the initial pulse width of the first pulse 10 is increased, such that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 equals the first target pulse width difference m, i.e., ab = m. Taking 30 nits and m as a fixed value of 24H as an example, it is known that the initial pulse widths of the first pulse 10 and the second pulse 20 are both 72H. Ensuring that the initial pulse width of the second pulse 20 remains unchanged, the updated second pulse width b of the second pulse 20 is 72H. Then, according to the pre-set first target pulse width difference m, the initial pulse width of the first pulse 10 is increased, and the updated first pulse width a = 72H + 24H = 96H is determined.

[0106] Optionally, according to a pre-set first target pulse width difference m, the initial pulse width of the first pulse 10 is increased while the initial pulse width of the second pulse 20 is decreased, such that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 equals the first target pulse width difference m, i.e., ab = m. Taking 30 nits and m as a fixed value of 24H as an example, it is known that the initial pulse widths of the first pulse 10 and the second pulse 20 are both 72H. Increasing the initial pulse width of the first pulse 10 determines the first pulse width a to be 94H, and decreasing the initial pulse width of the second pulse 20 determines the second pulse width b to be 70H.

[0107] Optionally, according to a pre-set first target pulse width difference m, ensuring that the initial pulse width of the first pulse 10 remains unchanged, the initial pulse width of the second pulse 20 is reduced, such that the updated first pulse width a of the first pulse 10 minus the updated second pulse width b of the second pulse 20 equals the first target pulse width difference m, i.e., ab = m. Taking 30 nits and m as a fixed value of 24H as an example, it is known that the initial pulse widths of the first pulse 10 and the second pulse 20 are both 96H. Ensuring that the initial pulse width of the first pulse 10 remains unchanged, the updated first pulse width a of the first pulse 10 is 96H; then, according to the pre-set first target pulse width difference m, the initial pulse width of the second pulse 20 is reduced, and the updated second pulse width b = 96H - 24H = 72H is determined.

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

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

[0110] For example, the first pulse width a of the first effective pulse (first pulse 10) minus the second pulse width b of the second effective pulse (second pulse 20) equals 24H. As verified in Table 3, at brightness levels of 2 nit, 30 nit, 120 nit, and 500 nit, the improved SVM values ​​are 0.56, 0.32, 0.22, and 0.16, respectively, meeting the user-defined SVM specifications (SPEC). Comparing Table 1, it can be seen that in this embodiment, when the first pulse width a of the first effective pulse minus the second pulse width b of other effective pulses after reset is greater than or equal to 24H, the SVM value can be reduced, thereby reducing flicker damage to the display panel.

[0111] Table 3

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

[0113] Although the embodiments provided above have improved the SVM results, testing has revealed that the actual brightness (nit) corresponding to a high display brightness value DBV is less than the actual brightness (nit) corresponding to a low display brightness value DBV. Figure 6 As shown, there is a brightness inversion region; see Table 4 for specific data.

[0114] Table 4

[0115]

[0116] Specifically, the actual brightness corresponding to a display brightness value DBV of 422 is 10.74 nits, and the actual brightness corresponding to a display brightness value DBV of 423 is 10.625 nits; the actual brightness corresponding to a display brightness value DBV of 589 is 21.115 nits, and the actual brightness corresponding to a display brightness value DBV of 590 is 20.78 nits; the actual brightness corresponding to a display brightness value DBV of 634 is 24.92 nits, and the actual brightness corresponding to a display brightness value DBV of 635 is 24.62 nits; the actual brightness corresponding to a display brightness value DBV of 704 is 31.23 nits, and the actual brightness corresponding to a display brightness value DBV of 705 is 30.87 nits. The aforementioned adjacent display brightness values ​​(DBV) all exhibit a situation where the actual brightness decreases instead of increasing. The degree of brightness change (DL / L = (next brightness - previous brightness) / previous brightness) is negative, violating the rule that the actual brightness increases with the increase of the display brightness value (DBV). Furthermore, the absolute value of DL / L is relatively large, causing the brightness increase during the DBV switching process to no longer be a smooth transition. The change in brightness may cause screen flickering, which is visible to the user and has an adverse effect.

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

[0118] S12-2-1. Determine the second correlation relationship corresponding to the preset brightness range based on the preset brightness range where the target brightness value is located.

[0119] The display brightness range of 0–1197 (less than the preset brightness value of 1198) includes one or more preset brightness ranges. If the display brightness range of 0–1197 includes one preset brightness range, it means that this display brightness range is the same as the preset brightness range. If the display brightness range of 0–1198 includes multiple preset brightness ranges, the display brightness value (DBV) in any preset brightness range is a continuous value. Optionally, the preset brightness range includes a first range 21 and a second range 22; the display brightness value (DBV) in the first range 21 is less than the display brightness value (DBV) in the second range 22. For example, the display brightness value (DBV) in the first range 21 is 0–410; the display brightness value (DBV) in the second range 22 is 410–1197.

[0120] The second correlation represents the correlation between each display brightness value DBV within the preset brightness range and the first preset pulse width difference m”; within the first range 21, the first preset pulse width difference m” is a fixed value; within the second range 22, the first preset pulse width difference m” decreases monotonically (but is not zero).

[0121] S12-2-2. Based on the second correlation, determine the second target pulse width difference corresponding to the target brightness value.

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

[0123] When the target brightness value is within the second interval 22, the second target pulse width difference is a monotonically changing value, meaning it decreases as the target brightness value increases. For example, the second correlation is linear, satisfying a linear equation (also called a first-order equation), with the independent variable being the display brightness value DBV and the dependent variable being the first preset pulse width difference m". These two have a unique correspondence; given the target brightness value, the first preset pulse width difference m" corresponding to that target brightness value can be uniquely determined and denoted as the second target pulse width difference. Furthermore, for another example, the second correlation corresponding to the second interval 22 satisfies a piecewise linear function, with an overall trend of monotonically decreasing.

[0124] S12-2-3. Based on the preset first correlation between the display brightness value and each pulse width, determine the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value.

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

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

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

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

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

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

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

[0132] In some embodiments, the second association relationship satisfies or Where X represents the target brightness value, k takes any number from 0 to 0.07 (including endpoint values), u takes any number from 40H to 85H (including endpoint values), and H represents the time for the luminous control signal EM to scan one row of sub-pixels. Indicates rounding up. This indicates rounding down, and Y represents the difference in pulse width for the second target. Optionally, Y can be an even number.

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

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

[0135] In some embodiments, when the target brightness value is located in the second interval 22, the second target pulse width difference is determined according to the second correlation represented by the following expression two: Expression two: or Where X represents the target brightness value, k takes any number from -0.063 to -0.017 (inclusive of endpoint values), and u takes any number from 43.67H to 81.07H (inclusive of endpoint values); Indicates rounding up. This indicates rounding down, and Y represents the difference in pulse width for the second target. Optionally, Y can be an even number.

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

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

[0138] Specifically, regarding S12-2-2: when the target brightness value is located in the first sub-interval 221, the second target pulse width difference is determined according to the second correlation represented by Formula 1 below. Formula 1: or Specifically, when the target brightness value is 495, according to Formula 1, we get Y = 36.21H. We round down to ensure that Y is an even number, that is, the second target pulse width difference is 36.

[0139] When the target brightness value is located in the second sub-interval 222, the second target pulse width difference is determined according to the second correlation represented by Formula 2 below. Formula 2: or Specifically, when the target brightness value is 640, according to Formula 2, we get Y = 32.76H. We round down to ensure that Y is an even number, that is, the second target pulse width difference is 32H.

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

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

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

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

[0144] Table 5

[0145]

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

[0147] Optionally, such as Figure 2 As shown, the second pulse 20 represents the second, third, and fourth effective pulses of the light emission control signal EM during the output phase t1. The second pulse width b of the second, third, and fourth effective pulses are all the same.

[0148] Optionally, such as Figure 4 As shown, the second pulse 20 represents the first, third, and fourth effective pulses of the light emission control signal EM during the output phase t1. The second pulse width b of the first, third, and fourth effective pulses are all the same.

[0149] In some embodiments, the light emission control signal EM includes a plurality of second pulses 20 in the output phase t1, at least some of the second pulses 20 having different second pulse widths b. Optionally, as Figure 9As shown, the second pulse width b of the second pulse 20 with an earlier output timing is greater than the second pulse width b of the second pulse 20 with a later output timing. Taking the second, third, and fourth valid pulses in output stage t1 as examples where all are the second pulse 20, the second pulse width b1 of the second valid pulse is greater than the second pulse width b2 of the third valid pulse; and / or, the second pulse width b2 of the third valid pulse is greater than the second pulse width b3 of the fourth valid pulse. This embodiment optimizes the second pulse width b of different second pulses 20 so that the second pulse width b of the second pulse 20 with an earlier output timing is greater than the second pulse width b of the second pulse 20 with a later output timing, thereby reducing the absolute value of DL / L and improving screen flickering.

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

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

[0152] S12-3-1. Determine the second correlation relationship corresponding to the preset brightness range based on the preset brightness range where the target brightness value is located.

[0153] The second correlation represents the correlation between each display brightness value DBV within the preset brightness range and the first preset pulse width difference m”, and the first preset pulse width difference m” decreases monotonically within the preset brightness range; the first preset pulse width difference m” represents the preset pulse width difference corresponding to the first output sub-stage.

[0154] For details on the implementation of this step, please refer to S12-2-1. Repeated parts will not be described again.

[0155] S12-3-2. Based on the second correlation, determine the second target pulse width difference corresponding to the target brightness value.

[0156] For details on the implementation of this step, please refer to S12-2-2. Repeated parts will not be described again.

[0157] S12-3-3. Based on the pre-set first correlation between the display brightness value and each pulse width, determine the initial pulse width of the first pulse corresponding to the target brightness value and the initial pulse width of the second pulse adjacent to the first pulse.

[0158] A preset display brightness value DBV (0-1197) corresponds to the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20, establishing a first correlation. Optionally, the initial pulse width of the first pulse 10 and the initial pulse width of the second pulse 20 are the same. It should be noted that as the display brightness value DBV gradually increases, the initial pulse widths of the first pulse 10 and the second pulse 20 also gradually increase.

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

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

[0161] The specific implementation process of adjusting the initial pulse width of the first pulse 10 in this step can be found in S12-2-4. The principle of adjusting the pulse width of the first sub-pulse width b01 can be found in S12-2-4. The repeated parts will not be described again.

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

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

[0164] S12-3-3 above further includes determining the initial pulse widths of the remaining second pulses 202 and 203 corresponding to the target brightness value based on a pre-set first correlation between the display brightness value and each pulse width. For example, the initial pulse widths of the second pulses 202 and 203 are the same.

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

[0166] Optionally, according to a pre-set third target pulse width difference n, ensuring the first sub-pulse width b1 remains unchanged, the initial pulse widths of the remaining second pulses 202 and 203 are reduced, such that the first sub-pulse width b01 minus the updated second sub-pulse width b2 equals the third target pulse width difference n, i.e., b1 - b2 = n. Also, the first sub-pulse width b01 minus the updated second sub-pulse width b3 equals the third target pulse width difference n, i.e., b1 - b3 = n. At this point, b2 = b3.

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

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

[0169] Table 6

[0170]

[0171] Specifically, in the first dimming mode, the pulse width of each effective pulse decreases sequentially with respect to the value of DBV, a > b1 > b2 > b3, and satisfies that m" decreases with increasing DBV value, n = b1 - b2 = b2 - b3. This has been verified, as shown below. Figure 12 As shown, comparison Figure 6 The data shows that significantly reducing the DL / L value in the brightness inversion area improves screen flickering. Figure 12 The brightness inversion area is shown in Table 7. For specific data, please refer to Table 7.

[0172] Table 7

[0173]

[0174] Specifically, the actual brightness corresponding to a display brightness value DBV of 422 is 10.74 nits, and the actual brightness corresponding to a display brightness value DBV of 423 is 10.665 nits; the actual brightness corresponding to a display brightness value DBV of 589 is 21.115 nits, and the actual brightness corresponding to a display brightness value DBV of 590 is 21 nits; the actual brightness corresponding to a display brightness value DBV of 634 is 24.92 nits, and the actual brightness corresponding to a display brightness value DBV of 635 is 24.82 nits; the actual brightness corresponding to a display brightness value DBV of 704 is 31.23 nits, and the actual brightness corresponding to a display brightness value DBV of 705 is 31.11 nits. Comparing the data in Table 4, it can be seen that the difference in actual brightness corresponding to adjacent display brightness values ​​DBV has decreased. Although the DL / L value is still negative, the absolute value of DL / L is small, allowing for a smooth transition during brightness increases, thus preventing screen flickering.

[0175] In some embodiments, such as Figure 13 As shown, the steps for determining the second sub-pulse width b02 of the remaining second pulse 20 include S12-3-61 to S12-3-63.

[0176] S12-3-61. Based on the determined second target pulse width difference, determine the fourth target pulse width difference between any two adjacent second pulses.

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

[0178] Table 8

[0179]

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

[0181] S12-3-62. Adjust the initial pulse width of the remaining second pulse according to the fourth target pulse width difference to obtain the updated second sub-pulse width.

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

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

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

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

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

[0187] When the target brightness value is greater than or equal to a preset brightness threshold, the second dimming mode is activated, and the output of the emission control signal EM is controlled according to the target duty cycle. Optionally, a 3P3H timing sequence is adopted. In the second dimming mode, the emission control signal EM includes three third pulses 30. The sum of the third pulse widths of the three third pulses 30 divided by one frame time is the target duty cycle. Here, the third pulse 30 refers to the effective pulse (active low). This embodiment improves the duty cycle of the emission control signal EM in the second dimming mode, placing it between 89% and 97%, for example, 96.82%, as shown in Table 9, which helps to reduce the SVM value.

[0188] Table 9

[0189]

[0190] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

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

[0192] The driver 100 is configured to acquire the target brightness value currently displayed on the display panel; if the target brightness value is less than a preset brightness threshold, the driver determines the first pulse width a of the first pulse 10 and the second pulse width b of the second pulse 20 of the light emission control signal EM in the output phase t1 based on the target brightness value; the output timing of the first pulse 10 is at least one second pulse 20 before the output timing of the second pulse 20, and the first pulse width a is greater than the second pulse width b.

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

[0194] The scanning drive circuit 200 is configured to, at least in an output phase t1, control the output of a first pulse 10 of the light emission control signal EM according to a first pulse width a, and control the output of a second pulse 20 of the light emission control signal EM according to a second pulse width b.

[0195] It should be noted that the scanning drive circuit 200 in this embodiment is configured to execute step S13 in the above display control method, and the repeated parts will not be described again.

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

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

[0198] This disclosure also provides a display device comprising the display panel described in any of the above embodiments. The display device can be, for example, any product with a display function such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or in-vehicle device. Other essential components of this display device are readily understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting the scope of this disclosure.

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

Claims

1. A display control method, wherein, include: Get the target brightness value currently displayed on the display panel; If the target brightness value is less than a preset brightness threshold, the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output stage are determined according to the target brightness value. The output timing of the first pulse precedes the output timing of the second pulse at least once, and the first pulse width is greater than the second pulse width; In at least one of the output stages, a first pulse of the light emission control signal is output according to the first pulse width, and a second pulse of the light emission control signal is output according to the second pulse width; The step of determining the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output stage according to the target brightness value includes: Based on the preset brightness range in which the target brightness value is located, a second correlation relationship is determined corresponding to the preset brightness range; the second correlation relationship represents the correlation between each display brightness value in the preset brightness range and the first preset pulse width difference value; the preset brightness range includes a first range and a second range; the display brightness value in the first range is less than the display brightness value in the second range; in the first range, the first preset pulse width difference value is a fixed value; in the second range, the first preset pulse width difference value decreases monotonically; Based on the second correlation, the second target pulse width difference corresponding to the target brightness value is determined; Based on a pre-set first correlation between the display brightness value and each pulse width, the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value are determined. Based on the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse to obtain the updated first pulse width and second pulse width.

2. The display control method according to claim 1, wherein, The light emission control signal includes a first pulse and at least one second pulse; The first pulse is the first valid pulse of the light emission control signal in the output phase; The second pulse is not the first valid pulse of the light emission control signal in the output phase.

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

4. The display control method according to claim 1, wherein, The display brightness value in the first range is 0~410; the display brightness value in the second range is 410~1197. The step of determining the second target pulse width difference value corresponding to the target brightness value based on the second correlation includes: When the target brightness value is within the first interval, the second target pulse width difference is determined according to the second correlation represented by the following expression: Y=p, where p takes any number from 35H to 45H; H represents the time for the light emission control signal to scan a row of sub-pixels. When the target brightness value is located in the second interval, the second target pulse width difference is determined according to the second correlation represented by the following expression: Y = ⌈k*X + u⌉ or ⌊k*X + u⌋; where X represents the target brightness value, k takes any number from -0.063 to -0.017, u takes any number from 43.67H to 81.07H, ⌈⌉ represents rounding up, ⌊⌋ represents rounding down, and Y represents the second target pulse width difference.

5. The display control method according to claim 4, wherein, The second interval includes a first sub-interval, a second sub-interval, a third sub-interval, and a fourth sub-interval; the display brightness value in the first sub-interval is 410~580; the display brightness value in the second sub-interval is 580~700; the display brightness value in the third sub-interval is 700~910; and the display brightness value in the fourth sub-interval is 910~1197. The step of determining the second target pulse width difference value corresponding to the target brightness value based on the second correlation includes: When the target brightness value is located in the first sub-interval, the second target pulse width difference is determined according to the second correlation represented by Formula 1 below; Formula 1: Y=⌈-0.03*X+51.06H⌉ or ⌊-0.03*X+51.06H⌋; When the target brightness value is located in the second sub-interval, the second target pulse width difference is determined according to the second correlation represented by the following formula: Formula 2: Y=⌈-0.017*X+43.67H⌉ or ⌊-0.017*X+43.67H⌋; When the target brightness value is located in the third sub-interval, the second target pulse width difference is determined according to the second correlation represented by the following formula three: Formula three: Y=⌈-0.038*X+58.67H⌉ or ⌊-0.038*X+58.67H⌋; When the target brightness value is located in the fourth sub-interval, the second target pulse width difference is determined according to the second correlation represented by the following formula four: Formula four: Y=⌈-0.063*X+81.07H⌉ or ⌊-0.063*X+81.07H⌋.

6. The display control method according to any one of claims 1 to 4, wherein, The light emission control signal includes multiple second pulses in the output stage, and the second pulse width of each second pulse is the same.

7. The display control method according to claim 1, wherein, The light emission control signal includes multiple second pulses in the output stage, and the second pulse width of the second pulse that is output earlier is greater than the second pulse width of the second pulse that is output later.

8. The display control method according to claim 7, wherein, For any of the output stages, the second pulse width of the second pulse adjacent to the first pulse in the output timing is denoted as the first sub-pulse width, and the second pulse width of the remaining second pulse is denoted as the second sub-pulse width; Based on the target brightness value, determining the first pulse width of the first pulse and the first sub-pulse width of the second pulse of the light emission control signal in the output stage includes: Based on the preset brightness range in which the target brightness value is located, a second correlation relationship is determined corresponding to the preset brightness range; the second correlation relationship represents the correlation between each display brightness value in the preset brightness range and the first preset pulse width difference value; the preset brightness range includes a first range and a second range; the display brightness value in the first range is less than the display brightness value in the second range; in the first range, the first preset pulse width difference value is a fixed value; in the second range, the first preset pulse width difference value decreases monotonically; Based on the second correlation, the second target pulse width difference corresponding to the target brightness value is determined; Based on a pre-set first correlation between the display brightness value and each pulse width, the initial pulse width of the first pulse corresponding to the target brightness value and the initial pulse width of the second pulse adjacent to the first pulse are determined. Based on the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse adjacent to the first pulse to obtain the updated first pulse width and first sub-pulse width.

9. The display control method according to claim 8, wherein, The steps for determining the second sub-pulse width of the remaining second pulse include: According to the preset third target pulse width difference, the initial pulse width of the remaining second pulse is adjusted to obtain the updated second sub-pulse width.

10. The display control method according to claim 9, wherein, The display panel includes multiple rows of sub-pixels; the third target pulse width difference is between 4H and 20H; H represents the time it takes for the light emission control signal to scan a row of sub-pixels.

11. The display control method according to claim 8, wherein, The steps for determining the second sub-pulse width of the remaining second pulse include: Based on the determined second target pulse width difference, a fourth target pulse width difference is determined for any two adjacent second pulses; the fourth target pulse width difference is less than the second target pulse width difference. Based on the fourth target pulse width difference, the initial pulse width of the remaining second pulse is adjusted to obtain the updated second sub-pulse width.

12. The display control method according to claim 11, wherein, The fourth target pulse width difference between two adjacent second pulses in the output timing sequence is greater than or equal to the fourth target pulse width difference between two adjacent second pulses in the output timing sequence.

13. The display control method according to claim 12, wherein, The fourth target pulse width difference between two adjacent groups of the second pulse is 4H; H represents the time it takes for the light emission control signal to scan a row of sub-pixels; The difference between the second target pulse width corresponding to the first pulse and the fourth target pulse width corresponding to the second pulse adjacent to the first pulse is 4H.

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

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

16. A display panel comprising a driver and a scan driving circuit; The driver is configured to acquire the target brightness value currently displayed on the display panel; If the target brightness value is less than a preset brightness threshold, the first pulse width of the first pulse and the second pulse width of the second pulse of the light emission control signal in the output stage are determined according to the target brightness value. The output timing of the first pulse precedes the output timing of the second pulse at least once, and the first pulse width is greater than the second pulse width; The scanning drive circuit is configured to, at least in one of the output stages, control the first pulse of the light emission control signal to be output according to the first pulse width, and control the second pulse of the light emission control signal to be output according to the second pulse width; The driver is specifically configured to determine a second correlation relationship corresponding to the preset brightness range based on the preset brightness range in which the target brightness value is located; the second correlation relationship represents the correlation relationship between each display brightness value in the preset brightness range and a first preset pulse width difference value; the preset brightness range includes a first range and a second range; the display brightness value in the first range is less than the display brightness value in the second range; in the first range, the first preset pulse width difference value is a fixed value; Within the second interval, the first preset pulse width difference decreases monotonically. Based on the second correlation, the second target pulse width difference corresponding to the target brightness value is determined; based on the preset first correlation between the display brightness value and each pulse width, the initial pulse width of the first pulse and the initial pulse width of the second pulse corresponding to the target brightness value are determined. Based on the second target pulse width difference, adjust the initial pulse width of the first pulse and the initial pulse width of the second pulse to obtain the updated first pulse width and second pulse width.

17. A computer-defined non-transient readable storage medium, wherein, The computer non-transient readable storage medium stores a computer program that, when executed by a processor, performs the steps of the display control method as described in any one of claims 1 to 15.

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