Display driving method and circuit, chip and electronic equipment

Abstract

The invention discloses a display driving method and circuit, a chip and electronic equipment. The display driving method comprises the following steps: acquiring a pulse period and a target refresh rate of a light-emitting signal, wherein the light-emitting signal is used for controlling the brightness of a display panel; in the pulse period, adjusting the pulse number of the light-emitting signal in the frame period according to the target refresh rate to obtain a new light-emitting signal; and driving the display panel according to the new light emitting signal. By adjusting the pulse number of the light-emitting signal in the frame period, the limitation of refresh rate adjustment is broken through, the flexibility of refresh rate adjustment is improved, and matching with more application scenes is facilitated to improve the display effect.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display driving method and circuit, chip, and electronic device. Background Art

[0002] With the continuous development of display technology, people have higher and higher requirements for the refresh rate of electronic devices. However, the energy consumption problem caused by high refresh rate has gradually become prominent. In order to balance the display effect and energy consumption, some electronic devices can adaptively adjust the refresh rate according to the display content, for example, displaying static images at a lower refresh rate and displaying dynamic images at a higher refresh rate.

[0003] In the prior art, among the commonly used methods for reducing the refresh rate, the first is frame skipping drive, and the second is to fixedly extend the display time of a line or certain non-display periods of the frame (such as horizontal front pulses, vertical front pulses). However, these two methods of reducing the refresh rate cannot achieve flexible adjustment of the refresh rate. For example, if the base frequency of the display device is 120Hz, then the first method can achieve a refresh rate of 60Hz or 30Hz, but cannot achieve a refresh rate of 90Hz or 45Hz; and the second method is mainly suitable for fixed frame rate scenarios, such as 90Hz, 60Hz, etc. The usage scenarios of both methods are very limited.

[0004] Therefore, a new display driving method is still needed. Summary of the invention

[0005] In view of the above problems, the purpose of the present application is to provide a display driving method and circuit, chip, and electronic device that can achieve flexible adjustment of the refresh rate.

[0006] According to one aspect of the present application, a display driving method is provided, which includes: obtaining a pulse period and a target refresh rate of a light emitting signal, wherein the light emitting signal is used to control the brightness of a display panel; under the pulse period, adjusting the number of pulses of the light emitting signal in a frame period according to the target refresh rate to obtain a new light emitting signal; and driving the display panel according to the new light emitting signal.

[0007] Optionally, obtaining the new luminous signal includes: adjusting the number of pulses step by step in a plurality of consecutive frame periods.

[0008] Optionally, the number of pulses at each level is maintained for at least one frame period.

[0009] Optionally, adjusting the number of pulses step by step includes: obtaining an adjustment step according to a current refresh rate and the target refresh rate; and obtaining the number of pulses at each level according to the current refresh rate or the target refresh rate and the adjustment step.

[0010] Optionally, the method further includes: adjusting the gamma value according to the number of pulses at each level.

[0011] Optionally, the gamma value is obtained according to a basic refresh rate and a minimum refresh rate of the display panel and a gamma weight corresponding to the number of pulses at each level.

[0012] Optionally, when an extended light emitting signal drives the display panel, the display driving circuit is switched to a low power consumption mode, and the extended light emitting signal includes an extended number of pulse cycles, where the extended number is the difference between the number of pulses at each level and the number of pulses corresponding to the basic refresh rate of the display panel.

[0013] Optionally, the target refresh rate is acquired according to influencing factors, where the influencing factors include at least one of display content, user behavior, and ambient light.

[0014] Optionally, the target refresh rate is acquired through a processor, and the number of pulses at each level and the corresponding gamma weights and the number of frame cycles to be maintained are pre-stored through a display driving circuit.

[0015] According to a second aspect of the present application, a display driving circuit is provided, which includes: a timing controller for obtaining a pulse period of a light-emitting signal and the number of pulses of the light-emitting signal in a frame period corresponding to a target refresh rate; and a light-emitting driver for providing a new light-emitting signal to drive a display panel according to the number of pulses and the pulse period, wherein the light-emitting signal is used to control the brightness of the display panel.

[0016] Optionally, the timing controller adjusts the number of pulses to change step by step in a plurality of consecutive frame periods according to the target refresh rate.

[0017] Optionally, the number of pulses at each level is maintained for at least one frame period.

[0018] Optionally, the timing controller is further used to obtain corresponding gamma values ​​according to the number of pulses at each level, and the display driving circuit further includes: a gamma voltage generator, which provides a gamma reference voltage according to the gamma value to correct display brightness.

[0019] Optionally, when the extended light emitting signal drives the display panel, the display driving circuit operates in a low power consumption mode, and the extended light emitting signal includes an extended number of pulse cycles, and the extended number is the difference between the number of pulses at each level and the number of pulses corresponding to the basic refresh rate of the display panel.

[0020] Optionally, it also includes: a register and a selector, the register is used to pre-store the number of pulses at each level and the corresponding gamma weight and the number of frame cycles maintained, the gamma weight is used to obtain the gamma value, the timing controller provides a selection signal to the selector according to the target refresh rate, and the selector reads the register according to the selection signal to obtain the number of pulses at each level, the gamma weight and the number of frame cycles maintained.

[0021] According to a third aspect of the present application, a chip is provided, comprising a display driving circuit as described in any one of the above items.

[0022] According to a fourth aspect of the present application, an electronic device is provided, comprising a chip as described above; and a display panel driven by the chip, wherein the display panel comprises an active matrix organic light emitting diode display panel.

[0023] According to the display driving method, circuit, chip, and electronic device provided in the present application, by adjusting the number of pulses of the light-emitting signal in the frame period, the limitations of the refresh rate adjustment in the prior art are broken through, and the flexibility of the refresh rate adjustment is improved, so that more application scenarios can be matched to improve the display effect.

[0024] Furthermore, by gradually adjusting the number of pulses in the luminous signal according to the current refresh rate and the target refresh rate, the refresh rate can be smoothly adjusted to enhance the user's visual experience.

[0025] Furthermore, obtaining a target refresh rate based on influencing factors such as display content, user behavior, and ambient light can reduce energy consumption and increase the usage time of the device.

[0026] Furthermore, when the extended light emitting signal drives the display panel, the display driving circuit can also be made to work in a low power consumption mode, thereby effectively improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present application will become more apparent through the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0028] Figure 1 A schematic structural diagram of an electronic device is shown;

[0029] Figure 2A A schematic structural diagram of a pixel is shown;

[0030] Figure 2B A schematic timing diagram showing a scanning signal and a light emitting signal;

[0031] Figure 3 A schematic flow chart showing a display driving method according to an embodiment of the present application is shown;

[0032] Figure 4 A schematic diagram showing the change of the refresh rate with the number of pulses of the light emitting signal in a frame period;

[0033] Figure 5 A schematic flow chart showing step-by-step adjustment of the number of pulses;

[0034] Figure 6 A schematic curve diagram showing the gamma value changing with grayscale;

[0035] Figure 7 A schematic structural diagram of a display driving circuit is shown. DETAILED DESCRIPTION

[0036] Various embodiments of the present application will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0037] At the same time, certain words are used in this specification and claims to refer to specific components. It should be understood by those skilled in the art that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction.

[0038] It should be understood that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by programmable circuits. When an element or circuit is said to be "connected to" another element or an element or circuit is said to be "connected between" two nodes, it may be directly coupled or connected to another element or there may be an intermediate element, and the connection between the elements may be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0039] In addition, it should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0040] It should also be noted that, in the various methods and processes of the present application, the size of the step numbers does not mean the order of execution, nor does it constitute any limitation on the implementation process of the embodiments of the present application.

[0041] Figure 1 A schematic structural diagram of an electronic device is shown, such as Figure 1 As shown, the electronic device includes a processor 10, a display driver circuit 20 and a display panel 30. Among them, the processor 10 can be an application processor (application processor, AP), which is a chip that integrates functions such as a processor core, a memory controller, a graphics processor, and a multimedia decoder, and is used to execute various applications and tasks. In smart phones, tablet computers and other electronic devices, AP can be a semiconductor chip, which is usually responsible for running an operating system, applications and processing multimedia content. In some embodiments, the processor 10 can also be one of a processor such as a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor (MP) or a digital signal processor (DSP). The processor 10 can obtain and transmit the image information to be displayed to the display panel 30 through the display driver circuit 20. For example, in the process of running a game, the processor 10 can obtain the scene data of the game, render the image information to be displayed according to the scene data of the game, and transmit the image information to the display driver circuit 20 so that the display driver circuit 20 drives the display panel to display.

[0042] Furthermore, the display panel 30 includes a plurality of pixels 31 arranged in an array. The display driving circuit 20 receives corresponding data signals VD, scanning signals VG and luminous signals Em through the data signal lines DL, scanning signal lines GL and luminous signal lines EL, and performs display based on these signals.

[0043] Specifically, Figure 2A A schematic diagram of the structure of a pixel is shown. Figure 2A, each pixel 31 includes a light emitting diode D1 and a pixel circuit 311 for providing a driving current for the light emitting diode D1. Specifically, the pixel circuit 311 includes transistors T1-T3 and a capacitor Cst. The first end of the first transistor T1 is connected to the data signal line DL to receive the data signal VD, the control end is connected to the scan signal line GL to receive the scan signal VG, and the second end is connected to the control end of the second transistor T2. The first end of the second transistor is connected to the power supply end of the first voltage VDD, and the second end is connected to the first end of the third transistor T3. The second end of the third transistor T3 is connected to the anode of the light emitting diode D1, and the control end is connected to the light emitting signal line EL to receive the light emitting signal Em. The capacitor Cst is connected between the first end and the control end of the second transistor T2. The cathode of the light emitting diode is connected to the power supply end of the second voltage VSS. Among them, for example, each transistor is a PMOS transistor, that is, each transistor is turned on when the control end receives a low voltage. It should be understood that in some other embodiments, at least some of the transistors can also use NMOS transistors. In addition, the pixel circuit 311 can also include more transistors and / or capacitors, and this application does not make too many restrictions on this.

[0044] Figure 2B The schematic timing diagram of the scanning signal and the light emitting signal is shown by taking two display frames Frame1 and Frame2 as an example. The timing diagram of the first display frame Frame1 is taken as an example for specific description.

[0045] refer to Figure 2A and Figure 2B , time t0 to time t3 is the frame period T of the first display frame Frame1 F , in the frame period T F In the embodiment, the scan signal VG has an effective level from time t0 to time t1 to turn on the first transistor T1. At the same time, the data signal line DL can provide a data signal VD, so that the first transistor T1 transmits and stores the data signal VD in the capacitor Cst, thereby maintaining the control terminal voltage of the second transistor T2. Therefore, the second transistor T2 can provide a driving current according to the first voltage VDD and the data signal VD. The light-emitting signal Em has an effective level from time t1 to time t2 to turn on the third transistor T3, and the driving current is provided to the light-emitting diode D1 by the turned-on third transistor T3 to drive the light-emitting diode D1 to emit light.

[0046] In some embodiments, for example, reference Figure 2B , the pulse period of the luminous signal Em is the same as the pulse period of the scanning signal VG, that is, the pulse period of the luminous signal is the same as the frame period T F However, during the entire pulse period of the light emitting signal Em, the light emitting diode D1 may not emit light all the time, that is, the pulse period of the light emitting signal has a certain duty cycle. Figure 2BIn the example, the light emitting diode D1 has a light emitting duration Tb1 of 1 / 3 of the pulse period, that is, 1 / 3 of the frame period T F The shorter the light-emitting duration Tb1 in each pulse cycle, the longer the non-light-emitting period between two adjacent display frames, and the easier it is for users to feel screen flicker. Figure 2B The luminous signal Em' in the frame period T F The pulse period T of the plurality of luminous signals EM , that is, T F =n×T EM , n>1. At the same time, a frame period T F The luminous duration Tb1 in the EM For example, in Figure 2B In the luminous signal Em' shown, T F =3T EM The luminous duration Tb1 of a frame period is evenly distributed to these three T EM That is, each pulse period T EM The light-emitting duration Tb2 in the embodiment is 1 / 3 Tb1. Therefore, the light-emitting frequency of the light-emitting diode D1 can be increased, thereby improving the display effect.

[0047] In the display driving method provided in the present application, the pulse period of the light emitting signal is used as a reference, and the frame period is extended by adjusting the number of pulses of the light emitting signal in each display frame, thereby achieving flexible adjustment of the refresh rate.

[0048] Specifically, Figure 3 FIG. 1 is a schematic flow chart of a display driving method provided by an embodiment of the present application. Figure 3 The display driving method provided in the present application comprises the following steps:

[0049] In step S11, a pulse period and a target refresh rate of a light emitting signal are obtained, wherein the light emitting signal is used to control the brightness of a display panel.

[0050] In this step, the target refresh rate is obtained according to the influencing factors of the refresh rate. Specifically, the influencing factors include at least one of the display content, user behavior and ambient light. In some other embodiments, the main influencing factors among the multiple influencing factors are determined and the target refresh rate is obtained according to the main influencing factors. For example, the display content can be used as the main influencing factor, when the target refresh rate corresponding to the displayed text content is 0.1Hz; the target refresh rate corresponding to the picture content is 51.4Hz; the target refresh rate corresponding to the video is 72Hz; the target refresh rate corresponding to the game screen is 120Hz, etc. The processor 10 can quickly obtain the target refresh rate by pre-storing the mapping relationship between the influencing factors and the target refresh rate. For another example, the user behavior can be used as the main influencing factor, when the electronic device interacts with the user, the corresponding target refresh rate is 120Hz; when the electronic device does not interact with the user, the corresponding target refresh rate is 72Hz. The interactive behavior can be touch interaction, voice interaction, etc., and this application does not make specific restrictions. For another example, the ambient light can be used as the main factor, when the ambient light is weak, the corresponding target refresh rate is 120Hz; when the ambient light is strong, the corresponding refresh rate is 72Hz, etc. In addition, in some other embodiments, the processor 10 obtains the target refresh rate according to the weight of each influencing factor. It should be understood that the above mapping relationship is only an example, and the present application should not be limited thereto.

[0051] The pulse period of the luminescence signal is as described above and will not be explained in detail here.

[0052] In step S12, under the pulse cycle, the number of pulses of the light emitting signal in the frame cycle is adjusted according to the target refresh rate to obtain a new light emitting signal.

[0053] Figure 4 FIG. 1 shows a schematic diagram of the change in refresh rate with the number of pulses of the luminous signal in a frame period. Figure 4 In the example, 120 Hz is taken as the basic refresh rate of the electronic device, and for example, when the refresh rate is 120 Hz, each frame period T F 1 includes 3 pulse periods T EM For the convenience of description, the number of pulses corresponding to the basic refresh rate is recorded as the basic number, and the difference between the number of pulses corresponding to the target refresh rate and the basic number of pulses is recorded as the extended number.

[0054] refer to Figure 4 , when the extension number is 1, a single frame period T F 2 includes 4 pulse cycles. That is to say, a single frame period is extended by 1 pulse period, so that the refresh rate drops to 90Hz. Similarly, when the extension number is 2, a single frame period T F 3 includes 5 pulse cycles, which reduces the refresh rate to 72Hz; when the extension number is 3, a single frame cycle TF 4 includes 6 pulse cycles, which reduces the refresh rate to 60Hz; when the extension number is 4, a single frame cycle T F 5 includes 7 pulse cycles, which reduces the refresh rate to 51.4Hz. When a single frame period is extended to 3600 pulse cycles, the actual refresh rate can be reduced to 0.1Hz.

[0055] It should be understood that in some embodiments, the pulse periods in different light emitting signals are the same. In some other embodiments, the pulse period of the light emitting signal can be further adjusted in the new light emitting signal to further improve the flexibility of the refresh rate adjustment.

[0056] In step S13, the display panel is driven according to the new light emitting signal.

[0057] According to the display driving method provided in the present application, by adjusting the number of pulse cycles in the frame period, the limitations of the refresh rate adjustment in the prior art are broken through. Not only can the adjustment of common frame rates such as 90Hz, 60Hz, etc. be achieved, but also 1Hz or even 0.1Hz, 0.01Hz fine-tuning can be achieved, thereby improving the flexibility of the refresh rate adjustment and matching more application scenarios.

[0058] Furthermore, in some embodiments, a new light emitting signal is directly obtained according to the number of pulses corresponding to the target refresh rate. In a preferred embodiment, the number of pulses is adjusted step by step in a plurality of consecutive frame periods according to the target refresh rate so that the change process of the refresh rate is smoother, which is conducive to improving the user experience. In some embodiments, the number of pulses at each level is maintained for at least one frame period, and the smoothness of the adjustment can be further improved by repetition of multiple frames.

[0059] Furthermore, in some embodiments, the difference in the number of pulses between two adjacent levels is always 1. That is, for each level of adjustment, the number of pulses in a single frame period increases / decreases by 1. This will improve the smoothness of the adjustment process, but when the difference in the number of pulses between the current refresh rate and the target refresh rate is large, it will cause the adjustment process to be too long.

[0060] Therefore, in a preferred embodiment, reference Figure 5 The schematic flow chart of adjusting the number of pulses step by step is shown, and the step by step adjustment of the number of pulses includes the following steps:

[0061] In step S21, the adjustment step size is obtained according to the current refresh rate and the target refresh rate.

[0062] The adjustment step is the difference in the number of pulses between two adjacent levels.

[0063] In this step, a mapping relationship between the difference in the number of pulses between the current refresh rate and the target refresh rate and the adjustment step length may be preset, and the adjustment step length may be obtained according to the preset relationship.

[0064] For example, the mapping relationship is obtained by dividing the interval based on the basic quantity, that is, the following relationship exists:

[0065] n×Base≤Δ<(n+1)×Base.

[0066] Among them, n is the adjustment step, Δ is the difference in the number of pulses between the current refresh rate and the target refresh rate, and Base is the basic number.

[0067] It should be understood that this mapping relationship is only for example.

[0068] In step S22, the number of pulses at each level is obtained according to the current refresh rate or the target refresh rate and the adjustment step size.

[0069] In some embodiments, the current refresh rate is used as the adjustment basis, combined with the preset step length to obtain the number of pulses at each level. For example, the adjustment is made from the base refresh rate (corresponding to the number of pulses as Base), and the adjustment step length is 2, and the difference in the number of pulses between the current refresh rate and the target refresh rate is 3. In the first level of adjustment, the expansion number is 2, and in the second level of adjustment, the expansion number is 3.

[0070] In some embodiments, the target refresh rate is used as the adjustment basis, combined with the preset step length to obtain the number of pulses at each level. Still taking the adjustment from the base refresh rate (corresponding to the number of pulses as Base), and the adjustment step length is 2, and the difference in the number of pulses between the current refresh rate and the target refresh rate is 3 as an example, then in the first level adjustment, the expansion number is 1, and in the second level adjustment, the expansion number is 3.

[0071] By selecting the adjustment step size, the adjustment time can be shortened, thereby improving the response speed and further saving power consumption.

[0072] Furthermore, in some embodiments, in order to reduce the visual jump caused by the refresh rate change, the gamma value (ie, grayscale coefficient) is also adjusted during the refresh rate adjustment process to adjust the display brightness.

[0073] Specifically, the gamma value corresponding to each level of pulse quantity can be obtained by interpolation calculation through the first gamma value and the second gamma value obtained in advance. The first gamma value is the gamma value corresponding to the reference refresh rate of the electronic device, and the second gamma value is the gamma value corresponding to the minimum refresh rate of the electronic device. For example, the calculation formula is as follows:

[0074] (1)

[0075] Among them, G is the gamma value corresponding to the display parameter, alpha is the gamma weight corresponding to the number of pulses at this level, G0 is the first gamma value, and G1 is the second gamma value.

[0076] Figure 6 The relationship between the gamma value and the grayscale value is shown in Figure 5 As shown, when the number of pulse periods in a frame period is greater, the corresponding gamma value is greater.

[0077] Further, in some embodiments, when the refresh rate is adjusted, the processor sends multiple adjustment signals to the display driver circuit to adjust the number of pulses step by step. This requires the processor to have higher data processing capabilities and more accurate time control, and frequent data transmission may also cause visual incoherence. In a preferred embodiment, a register is set in the display driver circuit, and the number of pulses at each level as described above and the corresponding gamma weight and the number of frame cycles maintained are stored. Therefore, the processor only needs to send a few bytes or even one byte of data to the display driver circuit to send the target refresh rate to the display driver circuit, which can effectively reduce the workload of the processor and the amount of data transmission. After receiving the target refresh rate, the display driver circuit reads the register to obtain the number of pulses at each level and the corresponding gamma weight and the number of frame cycles maintained, which can ensure that the refresh rate change is synchronized with the display content, thereby avoiding problems such as abnormal screen and display delay.

[0078] Furthermore, in some embodiments, due to the extension of the frame period, at least when the extended luminous signal drives the display panel, the display driving circuit does not need to perform data processing. The extended luminous signal includes an extended number of pulse periods. Therefore, at this stage, the electronic device, especially the display driving circuit, can be switched to a low power consumption mode, and circuit parts such as an image quality processing unit and a display compensation unit can be turned off to reduce energy consumption. The image quality processing unit includes, for example, circuit modules such as Demura and ODC (overdrive compensation). The display compensation unit includes, for example, circuit modules such as rounded corner compensation and crosstalk compensation.

[0079] According to the display driving method provided in the present application, by adjusting the number of pulses of the light-emitting signal in the frame period, the limitations of the refresh rate adjustment in the prior art are broken through, and the flexibility of the refresh rate adjustment is improved, so that more application scenarios can be matched to improve the display effect.

[0080] Furthermore, by gradually adjusting the number of pulses in the luminous signal according to the current refresh rate and the target refresh rate, the refresh rate can be smoothly adjusted to enhance the user's visual experience.

[0081] Furthermore, obtaining a target refresh rate based on influencing factors such as display content, user behavior, and ambient light can reduce energy consumption and increase the usage time of the device.

[0082] Furthermore, when the extended light emitting signal drives the display panel, the display driving circuit can also be made to work in a low power consumption mode, thereby effectively improving energy utilization efficiency.

[0083] The present application also provides a display driving circuit, which is applied to, for example, Figure 1 The electronic device shown can be used to implement the display driving method provided in the present application. Figure 6 A schematic structural diagram of the display driving circuit is shown.

[0084] refer to Figure 7 The display driving circuit includes: a timing controller 21, a data driver 22, a scan driver 23, a light emitting driver 24, a selector 25, a register 26 and a gamma voltage generator 221.

[0085] The plurality of pixels 31 arranged in an array on the display panel 30 are connected to the data driver 22, the scan driver 23 and the light driver 24 of the display driving circuit through corresponding data signal lines DL, scan signal lines GL and light signal lines EL. The structure of these pixels 31 is as shown in FIG. Figure 2A As shown, it can of course be any pixel in the prior art.

[0086] The pixel 31 can store or record the data signal VD provided through the data signal line DL in response to the scan signal VG provided through the scan signal line GL. The pixel 31 can also respond to the luminescence signal EM provided through the luminescence signal line EL to emit light of corresponding brightness according to the data signal VD.

[0087] The scan driver 23 may generate a scan signal VG based on the scan control signal SCS, and sequentially provide the scan signal VG to the corresponding pixels 31 via the corresponding scan signal lines. Here, the scan control signal SCS is provided by the timing controller 21 and may include a scan start signal, a scan clock signal, and the like.

[0088] The light driver 24 may generate a light signal Em based on the light control signal ECS, and may sequentially provide the light signal Em to the corresponding pixel 31 via each light control line EL. Here, the light control signal ECS is provided by the timing controller 21 and may represent the number of pulses and the pulse period.

[0089] The gamma voltage generator 221 may provide a gamma reference voltage based on a gamma value to correct display brightness. The gamma value is provided by the timing controller 21 .

[0090] The data driver 22 may generate a data signal VD based on the image data Data and the data control signal DCS provided from the timing controller 21 and the gamma reference voltage provided by the gamma voltage generator 221 , and may provide the data signal VD to the pixel 31 .

[0091] In some embodiments, reference Figure 7 The data driver 22 includes a gamma voltage generator 221. That is, the gamma voltage generator 221 is integrated with the data driver 22. In some other embodiments, the gamma voltage generator 221 may also be a circuit part independent of the data driver 22.

[0092] The timing controller 21 is used to receive image information IMG and a control signal CS from the processor. The timing controller 21 can obtain a pulse period of the light emitting signal according to the control signal CS.

[0093] In addition, in some embodiments, the timing controller 21 is also used to receive the number of pulses of the light emitting signal in the frame period corresponding to the target refresh rate from the processor. However, complex data transmission will increase the burden on the processor, especially in some embodiments, in order to smoothly adjust the refresh rate, the number of pulses will be adjusted step by step, which may also cause visual incoherence.

[0094] In a preferred embodiment, the number of pulses at each level is stored in the register 26. The timing controller 21 is used to receive the target refresh rate from the processor and provide a selection signal to the selector 25 according to the target refresh rate. The selector 25 reads the register according to the selection signal to obtain the number of pulses at each level, so that the timing controller can adjust the number of pulses to change step by step in a plurality of consecutive frame periods according to the target refresh rate, thereby achieving smoother adjustment. At the same time, the pressure of data transmission can also be reduced, thereby further saving energy consumption.

[0095] Furthermore, the display driving circuit also adjusts the gamma value according to the number of pulses to obtain a better display effect. Therefore, in some embodiments, the register 26 also stores the gamma weights corresponding to the number of pulses at each level, and the timing controller 21 obtains the corresponding gamma value according to the gamma weight and provides it to the gamma voltage generator 221 to further improve the display quality. The gamma weight and the related calculation method are as described above and will not be repeated here.

[0096] Furthermore, the number of pulses at each level is maintained for at least one frame period to achieve smoother regulation. Therefore, in some embodiments, the number of frame periods maintained by the number of pulses at each level is also stored in the register 26. The timing controller 21 also provides the maintained number of frame periods to the light driver 221 to achieve smoother regulation.

[0097] Furthermore, in some embodiments, when the extended light emitting signal drives the display panel, the display driving circuit operates in a low power consumption mode, which is more conducive to saving energy.

[0098] According to the display driving circuit provided in the present application, the above-mentioned display driving method can be implemented, and thus also has the above-mentioned beneficial effects, which will not be described in detail here.

[0099] In addition, the present application also provides a chip, including the display driving circuit provided in the present application, and thus also has the above-mentioned beneficial effects, which will not be described in detail here.

[0100] The present application also provides an electronic device including the chip as described above and a display panel driven by the chip, wherein the display panel includes an active matrix organic light emitting diode display panel, and thus also has the above-mentioned beneficial effects, which will not be described in detail here.

[0101] According to the embodiments of the present application as above, these embodiments do not describe all the details in detail, nor do they limit the present application to specific embodiments only. Obviously, according to the above description, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A display driving method, wherein: include: Acquiring a pulse period and a target refresh rate of a light emitting signal, wherein the light emitting signal is used to control the brightness of a display panel; Under the pulse cycle, adjusting the number of pulses of the light emitting signal in a frame cycle according to the target refresh rate to obtain a new light emitting signal; as well as The display panel is driven according to the new light emitting signal.

2. The display driving method according to claim 1, wherein: Obtaining the new light emitting signal includes: adjusting the number of pulses step by step in a plurality of consecutive frame periods.

3. The display driving method according to claim 2, wherein: The number of pulses at each level at least maintains one frame period.

4. The display driving method according to claim 2, wherein: The stepwise adjustment of the pulse quantity comprises: Obtaining an adjustment step size according to the current refresh rate and the target refresh rate; and The number of pulses at each level is obtained according to the current refresh rate or the target refresh rate and the adjustment step.

5. The display driving method according to claim 2, wherein: Also includes: The gamma value is adjusted according to the number of pulses at each level.

6. The display driving method according to claim 5, wherein: The gamma value is obtained according to the basic refresh rate and the minimum refresh rate of the display panel and the gamma weights corresponding to the number of pulses at each level.

7. The display driving method according to claim 1, wherein: When the extended light emitting signal drives the display panel, the display driving circuit is switched to a low power consumption mode. The extended light emitting signal includes an extended number of pulse cycles, and the extended number is the difference between the number of pulses at each level and the number of pulses corresponding to the basic refresh rate of the display panel.

8. The display driving method according to claim 1, wherein: The target refresh rate is obtained according to influencing factors, where the influencing factors include at least one of display content, user behavior, and ambient light.

9. The display driving method according to claim 8, wherein: The target refresh rate is acquired through a processor, and the number of pulses at each level and the corresponding gamma weights and the number of frame cycles to be maintained are pre-stored through a display driving circuit.

10. A display driving circuit, wherein: include: A timing controller, used to obtain a pulse period of a light emitting signal and the number of pulses of the light emitting signal in a frame period corresponding to a target refresh rate; as well as The light-emitting driver is used to provide a new light-emitting signal to drive the display panel according to the pulse quantity and the pulse period, and the light-emitting signal is used to control the brightness of the display panel.

11. The display driving circuit according to claim 10, wherein: The timing controller adjusts the number of pulses to change step by step in a plurality of consecutive frame periods according to the target refresh rate.

12. The display driving circuit according to claim 11, wherein: The number of pulses at each level at least maintains one frame period.

13. The display driving circuit according to claim 11, wherein: The timing controller is also used to obtain the corresponding gamma value according to the number of pulses at each level. The display driving circuit further includes: a gamma voltage generator, The gamma voltage generator provides a gamma reference voltage according to the gamma value to correct display brightness.

14. The display driving circuit according to claim 11, wherein: When the extended light emitting signal drives the display panel, the display driving circuit operates in a low power consumption mode, and the extended light emitting signal includes an extended number of pulse cycles, where the extended number is the difference between the number of pulses at each level and the number of pulses corresponding to the basic refresh rate of the display panel.

15. The display driving circuit according to claim 11, wherein: Also includes: registers and selectors, The register is used to store the number of pulses at each level and the corresponding gamma weight and the number of frame cycles to be maintained, and the gamma weight is used to obtain the gamma value. The timing controller provides a selection signal to the selector according to the target refresh rate, and the selector reads the register according to the selection signal to obtain the number of pulses at each level, the gamma weight, and the number of frame cycles maintained.

16. A chip, wherein: Comprising the display driving circuit as described in any one of claims 10-15.

17. An electronic device, wherein: include The chip as claimed in claim 16; as well as A display panel driven by the chip, wherein the display panel comprises an active matrix organic light emitting diode display panel.

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