Pixel driving circuit and signal processing method

Abstract

The invention provides a pixel driving circuit, a signal processing method and a D-IC. The input port of each first gating circuit is connected with a first switching circuit and the D-IC of the display panel, the k first gating circuits correspond to k display areas of the display panel, and the first switching circuit is used for transmitting data signals of at least one display area; and k * i pixel circuits, wherein each i pixel circuits are respectively connected with the output port of one first gating circuit. Based on the pixel driving circuit, the overall uniformity of the brightness of a screen picture can be ensured.

Description

Technical Field

[0001] This application relates to the field of electronic device technology, and more specifically, to pixel driving circuits and signal processing methods. Background Technology

[0002] In screen-based display technology, the uniformity of screen brightness is a crucial performance indicator. However, in practical applications, screen brightness often becomes uneven due to various factors. For example, the driving voltage input to the internal circuitry of the screen via the display integrated circuit (D-IC) decreases as the trace load in different areas of the screen increases, resulting in uneven brightness between different areas of the screen.

[0003] Uneven screen brightness directly affects the user's visual experience. Therefore, ensuring the uniformity of screen brightness is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a pixel driving circuit and a signal processing method, which can ensure the overall uniformity of screen brightness by performing pulse gating processing on the emission (EM) pulse signals corresponding to different partitions of the screen.

[0005] In a first aspect, a pixel driving circuit is provided for use in a display panel. The pixel driving circuit includes: a D-IC; k first gating circuits, the input port of each first gating circuit being connected to a first switching circuit and the D-IC of the display panel respectively, the k first gating circuits corresponding to k display areas of the display panel, where k is greater than 1, the first switching circuit being used to transmit data signals for at least one display area; and k×i pixel circuits, each i pixel circuit being connected to the output port of one first gating circuit respectively, where i is greater than 1.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, the input port of the first gating circuit is connected to the D-IC via a first shielded signal line, and the input port of the first gating circuit is also connected to the first switching circuit via a first data line and a second data line.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the D-IC is configured to send a first shielding signal to a first gating circuit, the pulse duration of the first shielding signal being positively correlated with the refresh rate of the display area corresponding to the first gating circuit, the first switching circuit being configured to send a first data signal and a second data signal to the first gating circuit, the first data signal and the second data signal being used to refresh the screen of two adjacent areas, the first gating circuit being used to output a first light-emitting pulse signal based on the first shielding signal, the first data signal and the second data signal, and when the refresh rate of the display area corresponding to the first gating circuit is less than the refresh rate of the first reference display area, the pulse frequency of the first light-emitting pulse signal is greater than the pulse frequency of the light-emitting pulse signal input to the first reference display area.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the pixel circuit includes: a first gating transistor, the control electrode of the first gating transistor being connected to a first gating circuit corresponding to the pixel circuit, for receiving a first light-emitting pulse signal, the first light-emitting pulse signal being used to control the first gating transistor to be turned on or off; and a light-emitting element, the light-emitting element being connected to the current output terminal of the first gating transistor.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the pixel driving circuit further includes: a gate-on array (GOA), the GOA including m shift register circuits, each shift register circuit being connected to a D-IC, where m is greater than 1; and m second gating circuits, the input ports of the m second gating circuits being connected to the m shift register circuits respectively, and the output port of each second gating circuit being connected to j pixel circuits, where m×j=k×i, and the m second gating circuits respectively correspond to the m display areas of the display panel.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the above-mentioned GOA is an emission (EM) GOA or an N-type semiconductor gate (N-gate) GOA.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the input port of the second gating circuit is connected to the D-IC via a second shielded signal line.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the D-IC is further configured to send a second shielding signal to the second gating circuit and a start pulse signal to the GOA. The second shielding signal is different from the first shielding signal, and the pulse duration of the second shielding signal is negatively correlated with the distance between the display area corresponding to the second gating circuit and the D-IC. The second gating circuit is used to output a second light-emitting pulse signal based on the second shielding signal and the output signal from the shift register circuit. When the distance between the display area corresponding to the second gating circuit and the D-IC is less than the distance between the second reference display area and the D-IC, the pulse frequency of the first light-emitting pulse signal is less than the pulse frequency of the light-emitting pulse signal input to the second reference display area.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, k display areas are arranged along a first direction of the display panel, and m display areas are arranged along a second direction of the display panel, with the first direction being perpendicular to the second direction.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the pixel circuit further includes: a second gating transistor, the control electrode of the second gating transistor being connected to a second gating circuit corresponding to the pixel circuit, for receiving a second light-emitting pulse signal, the second light-emitting pulse signal being used to control the second gating transistor to be turned on or off, and the first gating transistor being located between the light-emitting element and the second gating transistor.

[0015] Secondly, a signal processing method is provided, applied to a pixel driving circuit in any possible implementation of the pixel driving circuit design of the first aspect, wherein multiple areas of the display panel correspond to different refresh rates. The method includes: determining a third light-emitting pulse signal, the third light-emitting pulse signal being used to control the brightness of a first area of ​​the display panel; determining a first light-emitting pulse signal based on the third light-emitting pulse signal and a first refresh rate corresponding to the first area, wherein the first refresh rate is negatively correlated with the pulse frequency of the first light-emitting pulse signal, and the pulse frequency of the first light-emitting pulse signal is less than or equal to the pulse frequency of the third light-emitting pulse signal; and sending the first light-emitting pulse signal to the pixel circuit corresponding to the first area.

[0016] In conjunction with the second aspect, in some implementations of the second aspect, the first pulse shielding quantity is determined according to the first refresh rate and the first correspondence relationship. The first pulse shielding quantity is M, where M is greater than or equal to 0. The first correspondence relationship is used to indicate the correspondence between the first refresh rate and the first pulse shielding quantity. The first pulse shielding quantity is used to indicate the number of pulses of the third luminous pulse signal that are shielded per unit time. M pulses of the third luminous pulse signal per unit time are shielded to determine the first luminous pulse signal.

[0017] In conjunction with the second aspect, in some implementations of the second aspect, before shielding M pulses of the third luminous pulse signal per unit time, a data signal is received, and the data brush information signal is used to refresh the screen of the first area.

[0018] In conjunction with the second aspect, in some implementations of the second aspect, a first shielding signal is determined based on the number of first pulse shielding signals, and the pulses of the first shielding signal correspond in timing to M pulses of the third luminous pulse signal within a unit time; the pulses of the third luminous pulse signal are shielded by the first shielding signal to determine the first luminous pulse signal.

[0019] In conjunction with the second aspect, in certain implementations of the third aspect, a fourth light-emitting pulse signal is determined, which is used to control the brightness of the second area of ​​the display panel; a second light-emitting pulse signal is determined based on the fourth light-emitting pulse signal and a first distance between the second area and the D-IC, wherein the first distance is positively correlated with the pulse frequency of the second light-emitting pulse signal, and the pulse frequency of the second light-emitting pulse signal is less than or equal to the pulse frequency of the first light-emitting pulse signal; and the second light-emitting pulse signal is sent to the pixel circuit corresponding to the second area.

[0020] In conjunction with the second aspect, in some implementations of the second aspect, the second pulse shielding quantity is determined based on the first distance and the second correspondence, where the second pulse shielding quantity is N, and N is greater than or equal to 0. The second correspondence is used to indicate the correspondence between the first distance and the second pulse shielding quantity, and the second pulse shielding quantity is used to indicate the number of pulses of the fourth luminous pulse signal shielded per unit time. N pulses of the fourth luminous pulse signal per unit time are shielded to determine the second luminous pulse signal.

[0021] In conjunction with the second aspect, in some implementations of the second aspect, a second shielding signal is determined based on the number of second pulse shielding signals, and the pulses of the second shielding signal correspond in timing to N pulses of the fourth luminous pulse signal within a unit time; the pulses of the fourth luminous pulse signal are shielded by the second shielding signal to determine the second luminous pulse signal.

[0022] Thirdly, a screen is provided, including a pixel driving circuit in any possible implementation of the pixel driving circuit design of the first aspect described above.

[0023] Fourthly, an electronic device is provided, comprising a pixel driving circuit as in any possible implementation of the pixel driving circuit design of the first aspect above, or a screen as in any possible implementation of the screen design of the third aspect above.

[0024] Fifthly, a computer-readable storage medium is provided storing a computer program that is executed by a processor to implement the method in any possible implementation of the method design of the second aspect.

[0025] In a sixth aspect, a computer program product is provided, including instructions that, when executed by a processor, cause a computer to perform any possible implementation of the method design of the second aspect described above. Attached Figure Description

[0026] Figure 1 This is a diagram illustrating uneven brightness on a smartphone screen.

[0027] Figure 2 This is yet another illustration of uneven brightness on a smartphone screen;

[0028] Figure 3 This is a schematic diagram of a pixel driving circuit 300 provided in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the structure of a first gating circuit 320 according to an embodiment of this application;

[0030] Figure 5 This is a circuit diagram of a first gating circuit 320 proposed in an embodiment of this application;

[0031] Figure 6 This is a signal timing diagram of a first gating circuit 320 proposed in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of a current pixel circuit 700;

[0033] Figure 8 This is a schematic diagram of a pixel circuit 330 provided in an embodiment of this application;

[0034] Figure 9 This is a schematic diagram of another pixel driving circuit 300 proposed in the embodiments of this application;

[0035] Figure 10 This is a schematic diagram of a second gating circuit 350 proposed in an embodiment of this application;

[0036] Figure 11 This is a signal timing diagram of a second gating circuit 350 proposed in an embodiment of this application;

[0037] Figure 12 This is a schematic diagram of another pixel driving circuit 300 proposed in the embodiments of this application;

[0038] Figure 13This is a schematic flowchart of a signal processing method 1300 proposed in an embodiment of this application;

[0039] Figure 14 This is a schematic diagram of screen brightness distribution controlled by method 1300 provided in an embodiment of this application;

[0040] Figure 15 This is a schematic diagram of a system architecture 1500 for implementing method 1300 provided in an embodiment of this application;

[0041] Figure 16 This is a schematic diagram of the output waveform of the first light-emitting pulse signal corresponding to each area of ​​the screen according to an embodiment of this application;

[0042] Figure 17 This is a schematic flowchart of a signal processing method 1700 provided in an embodiment of this application;

[0043] Figure 18 This is a schematic diagram of screen brightness distribution controlled by method 1700 provided in an embodiment of this application;

[0044] Figure 19 This is a schematic diagram of a system architecture 1900 for implementing method 1700 provided in an embodiment of this application;

[0045] Figure 20 This is a schematic diagram of the output waveform of the second light-emitting pulse signal corresponding to each area of ​​the screen according to an embodiment of this application;

[0046] Figure 21 This is a schematic block diagram of a signal processing apparatus 2100 provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0048] This application will present various aspects, embodiments, or features relating to a system comprising multiple devices, components, modules, etc. It should be understood and appreciated that individual systems may include additional devices, components, modules, etc., and / or may not include all the devices, components, modules, etc. discussed in conjunction with the accompanying drawings. Furthermore, combinations of these approaches are also possible.

[0049] Furthermore, in the embodiments of this application, the words "exemplary," "for example," etc., are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" in the embodiments of this application should not be construed as being better or more advantageous than other embodiments or design schemes. Specifically, the use of the term "exemplary" is intended to present the concept in a concrete manner.

[0050] The business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0051] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0052] In this application embodiment, "at least one" refers to one or more, and "more than one" 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, and B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0053] With the rapid development of display technology, the uniformity of screen brightness has become one of the important indicators for measuring screen quality. However, in practical applications, the problem of uneven screen brightness is still prevalent. The main factors contributing to this problem are as follows:

[0054] On the one hand, the driving voltage (e.g., the voltage pulse of the light-emitting pulse signal used to trigger the light emission of the screen display elements) input to the screen's internal circuitry via the screen's D-IC input will decrease as the trace load corresponding to different areas of the screen increases, resulting in uneven brightness between different areas of the screen.

[0055] Figure 1 This is a diagram illustrating uneven brightness on a smartphone screen.

[0056] refer to Figure 1As shown, assuming the D-IC position at the bottom of the phone screen is used as the starting point and the position at the top of the phone screen is used as the ending point, the phone screen can be divided into X regions, where X > 1. The region closest to the D-IC is denoted as D1, and the region adjacent to D1 and located above D1 on the screen is denoted as D2, and so on. The region located at the top of the phone screen is denoted as DX.

[0057] Taking D1 and DX as examples, the various driving voltages used to trigger the screen display are input to the screen from the D-IC. As the driving voltage is transmitted from the near-IC end to the far-IC end, the load on the internal traces of the screen gradually increases, causing the driving voltage to gradually dissipate and the resistance voltage drop to gradually increase. This results in differences in brightness between different areas. For example, D1 is brighter than D2, D2 is brighter than D3, and so on. Therefore, there will be a significant difference in brightness between DX and D1, leading to noticeable uneven brightness across different areas of the screen.

[0058] On the other hand, taking organic light-emitting diode (OLED) screens as an example, these screens can adaptively reduce the refresh frequency of screen data signals based on low-temperature polysilicon (LTPS) or low-temperature polycrystalline oxide (LTPO) technologies to reduce power consumption, thereby achieving the variable refresh rate (VRR) function. However, to further reduce power consumption, some screens can achieve certain special scenes (e.g., always-on display, static scenes, or infrequently updated scenes) where only certain areas need to be refreshed at a higher frequency (high refresh rate), while other areas only need to be refreshed at a lower frequency (low refresh rate). This results in different refresh rates between different areas of the screen, achieving hybrid refresh display (HRD) technology. The average brightness of high refresh rate screen areas is usually higher than that of low refresh rate screen areas, causing uneven brightness between high and low refresh rate areas.

[0059] Figure 2 This is another illustration of uneven brightness on a smartphone screen.

[0060] refer to Figure 2As shown, based on the different refresh rates of different areas of the screen, the screen can be divided into high-frequency refresh rate areas and low-frequency refresh rate areas. For example, if the refresh rate of a certain area of ​​the screen is in the range of [0Hz, 60Hz], then that area is considered a low-frequency refresh rate area; if the refresh rate of a certain area of ​​the screen is in the range of [61Hz, 120Hz], then that area is considered a high-frequency refresh rate area. Of course, the parameters involved in the above area division are only an example, and the screen area division method can be adaptively adjusted for different screen performance or application scenarios.

[0061] It should be noted that during the process of generating a corresponding brightness image based on the light-emitting pulse signal, the brightness of the screen decreases over time within one refresh cycle.

[0062] For high-frequency refresh rate areas of the screen, the brightness decreases only slightly within a single refresh cycle due to the high refresh rate. Conversely, for low-frequency refresh rate areas, the brightness decreases more noticeably within a single refresh cycle due to the lower refresh rate. This results in different average brightness levels across different refresh rate areas of the screen. In other words, referring to... Figure 2 As shown, the brightness curve corresponding to the high-frequency refresh area (horizontal axis: time / s, vertical axis: brightness L / nit) is integrated to determine the first overall brightness value, and the brightness curve corresponding to the low-frequency refresh area is integrated to determine the second overall brightness value. The first overall brightness value is greater than the second overall brightness value. Therefore, the screen exhibits uneven brightness.

[0063] Considering that uneven screen brightness can directly affect the user's visual experience, this application proposes a pixel driving circuit and signal processing method to ensure the overall uniformity of screen brightness.

[0064] Figure 3 This is a schematic diagram of a pixel driving circuit 300 provided in an embodiment of this application.

[0065] The pixel driving circuit 300 is applied to the display panel, and the pixel driving circuit 300 includes:

[0066] D-IC 310;

[0067] k first gating circuits 320, each first gating circuit 320 having its input port connected to the first switch circuit 301 and D-IC 310 of the display panel respectively. The k first gating circuits 320 correspond to the k display areas of the display panel, where k is greater than 1. The first switch circuit 301 is used to transmit data signals for at least one display area.

[0068] There are k×i pixel circuits 330, and each i pixel circuit 330 is connected to the output port of a first gating circuit 320, where i is greater than 1.

[0069] In some possible embodiments, the input port of the first gating circuit 320 is connected to the D-IC 310 via a first shielded signal line, and the input port of the first gating circuit 320 is also connected to the first switching circuit 301 via a first data line and a second data line.

[0070] In some possible embodiments, the first shielding signal line is used to transmit a first shielding signal, the first data line is used to transmit a first data signal, and the second data line is used to transmit a second data signal.

[0071] In some possible embodiments, D-IC 310 is configured to send a first shielding signal to a first gating circuit 320, the pulse duration of which is positively correlated with the refresh rate of the display area corresponding to the first gating circuit 320. A first switching circuit 301 is configured to send a first data signal and a second data signal to the first gating circuit 320, which are used to refresh the screen of two adjacent areas. The first gating circuit 320 is used to output a first light-emitting pulse signal based on the first shielding signal, the first data signal, and the second data signal. When the refresh rate of the display area corresponding to the first gating circuit 320 is less than the refresh rate of the first reference display area, the pulse frequency of the first light-emitting pulse signal is greater than the pulse frequency of the light-emitting pulse signal input to the first reference display area.

[0072] It should be understood that the first light-emitting pulse signal can be used to control the light-emitting brightness of the i pixel circuits 330 corresponding to the first gating circuit 320.

[0073] It should be understood that the pixel driving circuit 300 described above is mounted on a display panel with HRD function. The first switch circuit turns on when the display panel has HRD function enabled and sends the first data signal and the second data signal to the first gating circuit 320. These are data signals used to refresh the image of a local area of ​​the screen. The first gating circuit 320 determines whether the currently input data signal needs to be output based on its internal circuitry. This enables the gating of the received refresh data signal and the gating of the light emission pulse signal at the same time.

[0074] In some possible embodiments, when the screen can adjust the HRD function to be turned on or off, the display panel further includes a second switch circuit 302, which is directly connected to the pixel circuit 330 under each area. The second switch circuit 302 is turned on when the HRD function is turned off, and at the same time the first switch circuit 301 is turned off. At this time, the first gating circuit 320 does not work.

[0075] Figure 4 This is a schematic diagram of the structure of a first gating circuit 320 proposed in an embodiment of this application.

[0076] refer to Figure 4 As shown, the first gating circuit 320 includes a first switching unit 321, a second switching unit 322, a differential control unit 322, a data selection unit 323, and a signal amplifier 324.

[0077] The first switching unit 321 includes a main path 3211, a first branch path 3212, and a second branch path 3213. The main path 3211 receives data signals. The first branch path 3212 is connected to the differential control unit 322 and is used to input the first data signal to the differential control unit 322. The second branch path 3213 directly sends the first data signal to the pixel circuit 330 corresponding to the first gating circuit 320. Therefore, when the HRD function is enabled on the screen, the first switching unit 321 connects the main path 3211 and the first branch path 3212; when the HRD function is disabled on the screen, the first switching unit 321 connects the main path 3211 and the second branch path 3213.

[0078] In some possible embodiments, the first switching unit 321 may include a single-pole double-throw switch disposed on the main circuit 3211. The first switching unit 321 can control the connection between the main circuit 3211 and the first branch circuit 3212 or the second branch circuit 3213 through the single-pole double-throw switch. The first switching unit 321 may also be an integrated switch, such as the one described above. Figure 4 The internal switch structure of the first switch unit 321 shown in the figure also includes two branches, but each branch is equipped with a switch. The first switch unit 321 controls the switches on the two branches to close or open in coordination with each other, so as to realize the function of the single-pole double-throw switch mentioned above.

[0079] Similarly, the second switching unit 322 includes a main path 3221, a first branch path 3222, and a second branch path 3223. The main path 3221 is used to receive data signals. The first branch path 3222 is connected to the differential control unit 322 and is used to input the second data signal to the differential control unit 322. The second branch path 3223 is used to directly send the second data signal to the pixel circuit 330 corresponding to the first gating circuit 320. Based on this, when the HRD function is enabled on the screen, the second switching unit 322 will connect the main path 3221 and the first branch path 3222. When the HRD function is disabled on the screen, the second switching unit 322 will connect the main path 3221 and the second branch path 3223.

[0080] The structural extension of the second switching unit 322 is the same as the structural extension of the first switching unit 321 described above, and will not be repeated here.

[0081] The differential control unit 322 is also connected to the data selection unit 323, the signal amplifier 324, and the D-IC. Specifically, the differential control unit 322 compares the acquired reference signal with the received first data signal, and then, based on the comparison result, outputs the result signal to the data selection unit 323 and outputs a first light-emitting pulse signal to the signal amplifier 324.

[0082] For example, the differential control unit 322 compares the acquired reference signal (usually the second data signal corresponding to the adjacent pixel circuit) with the currently received data signal. If the strength of the currently received data signal is greater than the strength of the reference signal, a first light emission pulse signal is generated based on the comparison result and output to the signal amplifier 324, and the currently received first data signal is output to the data selection unit 323.

[0083] In addition, the differential control unit 322 is also used to receive a first shielding signal from the D-IC. The first shielding signal is used to control the gate high potential (VGH) and gate low potential (VGL) of the thin film transistor of the corresponding pixel circuit of the gating unit (or gating circuit). When the first shielding signal is in the VGH state, the gate of the thin film transistor is controlled to open. When the first shielding signal is in the VGL state, the gate of the thin film transistor is controlled to close, thereby realizing the pulse shielding function of the first gating circuit 320 for the light emission pulse signal.

[0084] The data selection unit 323 is used to compare the currently received data signal with the data signal corresponding to the adjacent area. The comparison logic is similar to that of the differential control unit 322. If the strength of the currently received first data signal is greater than the strength of the second data signal corresponding to the adjacent area, the data signal is output; otherwise, the data signal is not output.

[0085] For example, if multiple regions of the screen are divided according to the column direction, then the first gating circuit 320 mentioned above can correspond to the region corresponding to a column of pixels on the screen (e.g., the (n+1)th column), while the adjacent region refers to the region corresponding to the adjacent column of pixels (the nth column).

[0086] The signal amplifier 324 is used to amplify the signal from the differential control unit 322.

[0087] In some possible embodiments, the signal amplifier 324 described above may include two NOT gates.

[0088] In some possible embodiments, a latch 325 may be provided between the differential control unit 322 and the signal amplifier 324, which is used to stabilize the signal voltage of the output signal of the differential control unit 322.

[0089] Accordingly, this application also provides a detailed circuit diagram of the first gating circuit 320.

[0090] Figure 5 This is a circuit diagram of a first gating circuit 320 proposed in an embodiment of this application.

[0091] It should be noted that the transistors used in the embodiments of this disclosure can be thin-film transistors, field-effect transistors, or other devices with the same or similar characteristics. Since the source and drain of the transistors are symmetrical, there is no distinction between them. In the embodiments of this disclosure, the control electrode of the transistor specifically refers to the gate of the transistor; to distinguish between the source and drain of the transistor, one electrode 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. The following embodiments use P-type transistors for illustration. When using a P-type transistor, the first electrode is the source, and the second electrode is the drain; the opposite is true for N-type transistors. It is conceivable that using an N-type transistor to implement the technical solutions of the following embodiments is something that those skilled in the art can easily conceive of without creative effort, and therefore falls within the protection scope of the embodiments of this disclosure.

[0092] refer to Figure 5 As shown, the first gating circuit 320 includes: a first transistor T01 to a thirteenth transistor T13;

[0093] The control electrode of the first transistor T01 is coupled to the first switch and the voltage terminal VGL of the display panel. When the first switch is turned on, the first refresh data signal is written to the control electrode of the first transistor T01. When the first switch is turned off, VGL writes a low voltage to the control electrode of the first transistor T01. The first electrode of the first transistor T01 is coupled to the first electrode of the second transistor T02 and the second electrode of the third transistor T03. The second electrode of the first transistor T01 is coupled to the first electrode of the fourth transistor T04.

[0094] The control electrode of the second transistor T02 is coupled to the second switch and the voltage terminal VGL of the display panel respectively. When the second switch is turned on, the second refresh data signal is written to the control electrode of the second transistor T02. When the second switch is turned off, VGL writes a low voltage to the control electrode of the second transistor T02. The second electrode of the second transistor T02 is coupled to the first electrode of the fifth transistor T05.

[0095] It should be understood that the first switch and the second switch mentioned above belong to the first switch circuit 301. The first switch is used to input a first data signal, and the second switch is used to input a second data signal. The first data signal is used to refresh the screen of the area corresponding to the first gating circuit 320, and the second data signal is used to refresh the screen of the area corresponding to the gating circuit adjacent to the first gating circuit 320.

[0096] In summary, the first switch is equivalent to the switch in the first switch unit 321 of the foregoing embodiment for controlling the on / off state of the first branch 3212, and the second switch is equivalent to the switch in the second switch unit 322 of the foregoing embodiment for controlling the on / off state of the first branch 3222. The first switch unit 321 and the second switch unit 322 belong to the first switch circuit 301 of the foregoing embodiment.

[0097] The control electrode of the third transistor T03 is coupled to D-IC to receive the first shielding signal, and the first electrode of the third transistor T03 is coupled to the voltage terminal VGH.

[0098] The fourth transistor T04 has its control electrode coupled to the first node N01 and its second electrode coupled to the second node N02.

[0099] The fifth transistor T05 has its control electrode coupled to the third node N03, and its second electrode coupled to the fourth node N04.

[0100] The sixth transistor T06 has its control electrode coupled to D-IC to receive the first shielding signal, its first electrode coupled to VGL, and its second electrode coupled to the second node N02.

[0101] The seventh transistor T07 has its control electrode coupled to the first node N01, its first electrode coupled to VGL, and its second electrode coupled to the second collector N02.

[0102] The eighth transistor T08 has its control electrode coupled to the third node N03, its first electrode coupled to VGL, and its second electrode coupled to the fourth node N04.

[0103] Among them, the first node N01 and the fourth node N04 are connected by a line, and the second node N02 and the third node N03 are connected by a line;

[0104] The ninth transistor T09 has its control electrode coupled to D-IC to receive the first shielding signal. The first electrode of the ninth transistor T09 is coupled to VGL, and the second electrode of the ninth transistor T09 is coupled to the fourth node N04.

[0105] The tenth transistor T10 has its control electrode coupled to the fifth node N05, its first electrode coupled to VGH, and its second electrode coupled to the sixth node N06.

[0106] The eleventh transistor T11 has its control electrode coupled to the fifth node N05, its first electrode coupled to VGL, and its second electrode coupled to the sixth node N06.

[0107] The twelfth transistor T12 has its control electrode coupled to the seventh node N07, its first electrode coupled to VGH, and its second electrode coupled to the eighth node N08.

[0108] The thirteenth transistor T13 has its control electrode coupled to the seventh node N07, its first electrode coupled to VGL, and its second electrode coupled to the eighth node N08.

[0109] Among them, the fifth node N05 is connected to the fourth node N04 by a line, the sixth node N06 is connected to the seventh node N07 by a line, and the eighth node N08 is used to lead out the output terminal. This output terminal can be connected to the pixel circuit 330 mentioned above and is used to output the first light-emitting pulse signal generated inside the first gating circuit 320.

[0110] refer to Figure 5 As shown, in the symbol used to represent transistors, the form of the circle at the end of the line segment representing the control electrode is related to the type of transistor. A black-filled circle corresponds to an N-type transistor, and a white-filled circle corresponds to a P-type transistor.

[0111] It should be understood that T04 to T09 above essentially constitute a differential circuit, which is used to compare the potentials of the first data signal input from the control electrode T01 and the second data signal input from the control electrode T02, and write the final output potential of the differential circuit to the fourth node N04 and output the potential.

[0112] In addition, T09 to T13 above essentially constitute a double NOT gate circuit, which is used to regulate and amplify the potential signal written to the eighth node and output it.

[0113] For ease of understanding, the following specific example illustrates the operating principle of the first gating circuit 320 proposed in the embodiments of this application.

[0114] Assuming the voltage of the first data signal is greater than the voltage of the second data signal, and the first data signal is input to T01 and the second data signal is input to T02, causing T01 and T02 to conduct, and the first shielding signal is input to T03, causing T03 to conduct, the high potential of VGH will be written to the first terminal of T05, but not to the circuit on the T04 side. At this time, T05 starts to turn on, and the high potential of VGH is sequentially written to N04, N01, and then to the control terminals of T04 and T07. Since the second terminal of T07 is at a low potential, With T07 off and T04 on, the low level of VGL can be sequentially written to N02 and N03 via T04, and then to the control electrodes of T05 and T08. This increases the opening degree of T05, and the process repeats until it is fully open. At this point, the high level of VGH is written to N07, and then to the control electrodes of T10 and T11, turning on T11. This writes the low level of VGL to N06 and N07, and then to the control electrodes of T12 and T13, turning on T12. Finally, a high level is output, which is the aforementioned first light-emitting pulse signal. Since the first shielding signal can control the on or off state of T03, i.e., the signal pulse of the first shielding signal can control the on or off state of T03, it can determine the number of pulses of the first light-emitting pulse signal per unit time, thereby controlling the light-emitting brightness of the pixel circuit 330 to which the first light-emitting pulse signal is input.

[0115] Figure 6 This is a signal timing diagram of a first gating circuit 320 proposed in an embodiment of this application.

[0116] refer to Figure 6 The diagram shows the timing of relevant signals in the first gating circuit 320 during the refresh period of refreshing one frame. The length of the refresh period is related to the screen refresh rate; the higher the refresh rate, the shorter the refresh period.

[0117] During the refresh period, the D-IC inputs a first shielding signal into the first gating circuit 320. The refresh period includes two phases: a preparation phase (t1) and an emission phase (t2).

[0118] During the preparation phase, the first switch is turned on based on the first switch signal and the second switch is turned on based on the second switch signal, so that the first data signal and the second data signal of a specific waveform are input to the first gating circuit 320.

[0119] During the light-emitting phase, the first gating circuit 320 generates a light-emitting pulse signal based on the first data signal and the second data signal. However, during the generation of the light-emitting pulse signal, the first shielding signal, by controlling the on / off state of T03, can directly affect the potential of the light-emitting pulse signal, thereby affecting the pulse duration of the light-emitting pulse signal, thus forming... Figure 6 The low-level pulse with a duration of t3 shown serves to shield the light-emitting pulse signal to a certain extent, and finally outputs the first light-emitting pulse signal.

[0120] Based on the structure of the pixel driving circuit 300 described above, it is known that the pixel circuit 330 needs to be connected to the first gating circuit 320. However, the current pixel circuit is not connected to a gating circuit. Therefore, this application also proposes a pixel circuit to match the pixel driving circuit 300 described above.

[0121] Before introducing the pixel circuit proposed in the embodiments of this application, the pixel circuit of the present stage will be introduced first.

[0122] Figure 7 This is a schematic diagram of a pixel circuit 700 at this stage. This pixel circuit 700 can be used to implement the HRD function of the screen.

[0123] This pixel circuit is based on the interconnection of multiple transistors (T1 to T8), a capacitor (Cst), and a light-emitting element (P). For specific connection details, please refer to [reference needed]. Figure 7 As shown, details will not be elaborated here. The following focuses on explaining the function of each component.

[0124] In this circuit, the gate of T8 receives the control signal for the high refresh rate, namely Reset_H(n). When the signal voltage of Reset_H(n) reaches a certain threshold, T8 is turned on, allowing the initialization voltage signal Vinit3 to be input from T8 to the pixel circuit. Vinit3 is then written to node N2 in the pixel circuit 700. Vinit3 refers to the initial input voltage during pixel circuit refresh, and this signal participates in controlling whether the data signal is written to the pixel circuit.

[0125] Similarly to T8, the gate of T1 is used to receive the control signal for screen refresh, namely Reset_P(n), where P refers to T1 being a P-type thin film transistor. When the signal voltage of Reset_P(n) reaches a certain threshold, T1 will be turned on, thereby enabling the initialization voltage signal Vinit1 to be input from T7 to the pixel circuit, and then Vinit1 will be written to the N3 node in the pixel circuit 700.

[0126] T7 works similarly to T8. The gate of T1 is used to receive the control signal for the high refresh rate of the screen, namely Reset_H(n). When the signal voltage of Reset_H(n) reaches a certain threshold, T7 will be turned on, so that the initialization voltage signal Vinit2 can be input from T7 to the pixel circuit, and then Vinit2 can be written to the N4 node in the pixel circuit 700.

[0127] The gate of T4 is used to receive the gate control signal Gate_P(n), where n refers to the nth column or nth row in the pixel array corresponding to the pixel circuit, and P refers to the T4 bit P-type thin film transistor. When the voltage drop between the signal voltage of Gate_P(n) and the signal voltage of Vinit3 written to the N2 node meets a certain threshold condition, T4 will be turned on, thereby enabling the data signal to be input from T4 to the pixel circuit to realize the refresh of the image corresponding to the pixel circuit.

[0128] The gates of T5 and T6 are used to receive light-emitting pulse signals that have not undergone pulse gating processing. It should be understood that the light-emitting pulse signals input to T5 and T6 are the same. When the voltage drops corresponding to the three pins of T5 or T6 meet a certain numerical relationship, T5 or T6 will conduct, causing the positive power supply voltage (voltage drain, VDD) on the T5 side to be written into the pixel circuit 700, and the Vinit1 on the T6 side to be written into the pixel circuit 700, thereby transmitting the light-emitting pulse signal to the light-emitting device P to trigger the light-emitting element P to emit light of a corresponding brightness.

[0129] The gate of T2 is used to receive the gate control signal Gate_N, where N refers to the N-type thin-film transistor of T2. When the voltage drop of the three pins of T2 meets a certain value relationship, T2 will be turned on, thereby refreshing the voltage signal of the N1 node, so as to trigger the screen refresh function of the pixel circuit 700.

[0130] Based on the voltage drop relationship between the three pins, T3 is controlled to turn on or off, thereby controlling the pixel circuit to turn on or off.

[0131] The capacitor Cst is placed between nodes N1 and N5 and serves to store electrical energy and stabilize voltage.

[0132] The light-emitting element P is positioned below node N4 and is used to emit light of corresponding brightness based on the light-emitting pulse signal from the pixel circuit and the negative power supply voltage (VSS). This light-emitting element P can be an OLED.

[0133] Figure 8 This is a schematic diagram of a pixel circuit 330 provided in an embodiment of this application.

[0134] refer to Figure 8 As shown, the pixel circuit 330 includes:

[0135] The first selection transistor 331 has its control electrode connected to the first selection circuit 320 corresponding to the pixel circuit 330, and is used to receive the first light-emitting pulse signal. The first light-emitting pulse signal is used to control the first selection transistor 331 to be turned on or off.

[0136] The light-emitting element 332 is connected to the current output terminal of the first gating transistor 331.

[0137] It should be noted that the "gating" in the first gating transistor 331 refers to its connection with the first gating circuit 320, and is not a limitation on the function of the transistor.

[0138] In some possible embodiments, when the first gating transistor 331 is a P-type transistor, the current output terminal may be the drain of the first gating transistor 331.

[0139] In some possible embodiments, the light-emitting element 332 described above may be an OLED.

[0140] based on Figure 8 As shown in the schematic diagram of the complete pixel circuit 330, the difference between this pixel circuit 330 and the current pixel circuit 400 is that the pixel circuit 330 adds a first selection transistor 331. This first selection transistor 331 is located between node N4 and the light-emitting element 332. The control electrode of the first selection transistor 331 is used to receive the first light-emitting pulse signal obtained after processing by the first selection circuit 320 as mentioned in the previous embodiment, so that the structure of the pixel circuit 330 is adapted to the first selection circuit 320. When the voltage drop corresponding to the three pins of the first selection transistor 331 meets a certain numerical relationship (local screen refresh is required), the first selection transistor 331 will conduct, thereby transmitting the first light-emitting pulse signal to the light-emitting device 332 to trigger the light-emitting element 332 to emit light of a corresponding brightness. Multiple pixel circuits 330 throughout the screen emit light based on the first light-emitting pulse signal obtained after different degrees of pulse shielding input from the corresponding first selection circuit 320, enabling differentiated brightness control for different areas of the screen.

[0141] Based on the above technical solution, when refreshing a portion of the screen, a corresponding first shielding signal can be determined according to the refresh rate of different areas of the screen. This shields the light-emitting pulse signals used to trigger the pixel circuits in different areas to emit light, achieving signal gating of the light-emitting pulse signals. This allows adjustment of the pulse frequency of the light-emitting pulse signals corresponding to each area of ​​the screen, sending lower frequency light-emitting pulse signals to areas with higher refresh rates and higher frequency light-emitting pulse signals to areas with lower refresh rates. This ensures that the brightness of different areas of the screen remains as consistent as possible, avoiding the problem of large differences in the average brightness between areas per unit time due to the greater brightness attenuation in areas with lower refresh rates compared to areas with higher refresh rates. This helps to ensure the uniformity of brightness in different areas of the screen, thus guaranteeing a good visual experience for the user.

[0142] Figure 9 This is a schematic diagram of another pixel driving circuit 300 proposed in the embodiments of this application.

[0143] The pixel driving circuit 300 includes:

[0144] D-IC 310;

[0145] 330 is a circuit with m×j pixels, where m×j=k×i;

[0146] GOA 340 includes m shift register circuits 341, each of which is connected to D-IC 310, where m is greater than 1.

[0147] There are m second gating circuits 350, the input ports of the m second gating circuits 350 are connected to m shift register circuits 341 respectively, and the output port of each second gating circuit 350 is connected to j pixel circuits 330. The m second gating circuits 350 correspond to the m display areas of the display panel respectively.

[0148] In some possible embodiments, the GOA 340 described above is an EM GOA or an N-gate GOA.

[0149] In some possible embodiments, the input port of the second gating circuit 350 is connected to the D-IC 310 via a second shielded signal line.

[0150] In some possible embodiments, the second shielding signal line is used to transmit the second shielding signal.

[0151] In some possible embodiments, D-IC 310 is configured to send a second shielding signal to the second gating circuit 350 and a start pulse signal to GOA 340, wherein the second shielding signal is different from the first shielding signal, and the pulse duration of the second shielding signal is negatively correlated with the distance between the display area corresponding to the second gating circuit 350 and D-IC 310; the second gating circuit 350 is used to output a second light-emitting pulse signal based on the second shielding signal and the output signal from the shift register circuit 341. When the distance between the display area corresponding to the second gating circuit 350 and D-IC 310 is less than the distance between the second reference display area and D-IC 310, the pulse frequency of the first light-emitting pulse signal is less than the pulse frequency of the light-emitting pulse signal input to the second reference display area.

[0152] The second light-emitting pulse signal can be used to control the light-emitting brightness of the j pixel circuits 330 corresponding to the second gating circuit 350.

[0153] It should be understood that the above m shift register circuits 341 are cascaded together.

[0154] In some possible embodiments, the aforementioned start pulse signal is also called the start of vertical scan (STV) signal, and the output signal of the shift register circuit 341 is the signal output based on the STV signal. The D-IC can send the STV signal to the first m shift register circuits 341 in the cascaded m shift register circuits 341, and then transmit the STV signal to the next level shift register circuit 341 in sequence to trigger all shift register circuits 341 to send output signals to the m second gating circuits 350.

[0155] In some possible embodiments, reference is made to the above. Figure 8 The pixel circuit 330 may further include a second gate transistor 333, the control electrode of which is connected to the second gate circuit 350 corresponding to the pixel circuit 330, for receiving a second light-emitting pulse signal. The second light-emitting pulse signal is used to control the second gate transistor 333 to be turned on or off. The first gate transistor 331 is located between the light-emitting element 332 and the second gate transistor 333.

[0156] Figure 10 This is a schematic diagram of a second gating circuit 350 proposed in an embodiment of this application.

[0157] The second gating circuit 350 includes: fourteenth transistor T14 to twenty-third transistor T23;

[0158] Among them, the control electrode of the fourteenth transistor T14 is coupled to D-IC to receive the second shielding signal, the first electrode of the fourteenth transistor T14 is coupled to VGH, and the second electrode of the fourteenth transistor T14 is coupled to the ninth node N09.

[0159] The control electrode of the fifteenth transistor T15 is coupled to D-IC to receive the second shielding signal. The first electrode of the fifteenth transistor T15 is coupled to VHL, and the second electrode of the fifteenth transistor T15 is coupled to the ninth node N09.

[0160] The control electrode of the sixteenth transistor T16 is coupled to both the ninth node N09 and the tenth node N10. The first electrode of the sixteenth transistor T16 is coupled to VGH, and the second electrode of the sixteenth transistor T16 is coupled to the eleventh node N11.

[0161] The control electrode of the seventeenth transistor T17 is coupled to the ninth node N09, the first electrode of the seventeenth transistor T17 is coupled to VGL, and the second electrode of the seventeenth transistor T17 is coupled to the eleventh node N11.

[0162] The control electrode of the eighteenth transistor T18 is coupled to the eleventh node N11, the first electrode of the eighteenth transistor T18 is coupled to VGH, and the second electrode of the eighteenth transistor T18 is coupled to the tenth node.

[0163] The control electrode of the nineteenth transistor T19 is coupled to the eleventh node N11, the first electrode of the nineteenth transistor T19 is coupled to VGL, and the second electrode of the nineteenth transistor T19 is coupled to the tenth node.

[0164] The control electrode of the twentieth transistor T20 is coupled to the control electrode of the twentieth transistor T21 and connected to the output port of the shift register circuit 341 to receive the output signal, which is used to generate the second light-emitting pulse signal. The first electrode of the twentieth transistor T20 is coupled to the eleventh node, and the second electrode of the twentieth transistor T20 and the second electrode of the twentieth transistor T21 are coupled to the twelfth node N12.

[0165] The first terminal of the twenty-first transistor T21 is coupled to VGL;

[0166] The control electrode of the 22nd transistor T22 and the control electrode of the 23rd transistor T23 are coupled to the 13th node N13. The 13th node N13 is connected to the 12th node N12 via a line. The first electrode of the 22nd transistor T22 is coupled to VGH. The second electrode of the 22nd transistor T22 and the second electrode of the 23rd transistor T23 are coupled to the 14th node N14. The 14th node is used to output the second light-emitting pulse signal generated in the second gating circuit 350.

[0167] The first terminal of the twenty-third transistor T23 is coupled to VGL.

[0168] In addition, the second gating circuit 350 also includes a first capacitor C1, which is connected between the aforementioned thirteenth node and VGL.

[0169] It should be understood and referenced. Figure 10 As shown, T14 and T15 essentially form a NOT gate circuit, and T16 to T19 essentially form a latch. This latch is used to latch the potential of the input second shielding signal, hold the pulse potential of the second shielding signal, and then mix it with the output signal from the shift register circuit through the circuit to achieve the desired result. T20 to T23 essentially form a double NOT gate circuit, used to amplify and regulate the signal.

[0170] For ease of understanding, the following specific example illustrates the operating principle of the second gating circuit 350 proposed in the embodiments of this application.

[0171] When the output signal from the shift register circuit is high, T20 is turned off and T21 is turned on, so that the low potential of VGL is written to N12 and N13. At this time, T22 is turned on and T23 is turned off, and finally the high potential of VGH is output.

[0172] When the output signal from the shift register circuit is low, T21 is turned off and T20 is turned on, so that the inverse signal of the second shielding signal is written to N12 and N13. When the inverse signal of the second shielding signal is high, T22 is turned on and T23 is turned off, and finally the high potential of VGH is output. When the inverse signal of the second shielding signal is low, T23 is turned on and T22 is turned off, and finally the high potential of VGL is output. Thus, the pulse shielding effect of the second shielding signal on the output signal is realized, and the final output signal is the aforementioned second light-emitting pulse signal.

[0173] Figure 11 This is a signal timing diagram of a second gating circuit 350 proposed in an embodiment of this application.

[0174] refer to Figure 11 As shown, the timing diagram of the relevant signals in the second gating circuit 350 is given during the refresh period when refreshing one frame.

[0175] During the refresh period, the D-IC will input a second shielding signal into the second gating circuit 350.

[0176] As explained above, when the second shielding signal is low, it can function as a gate (or shield) for the output signal, pulling the output signal from low to high. Since this second shielding signal is determined by the distance between the display area corresponding to the second selection circuit 350 and the D-IC, different distances correspond to different degrees of signal shielding effectiveness. (Reference) Figure 11 As shown, the distance between the display area corresponding to the second gating circuit 350-m and the D-IC is greater than the distance between the display area corresponding to the second gating circuit 350-k and the D-IC. Therefore, one pulse in the second light-emitting pulse signal k output by the second gating circuit 350-k is shielded, while the second light-emitting pulse signal m output by the second gating circuit 350-m is not affected by the shielding.

[0177] Based on the above technical solution, the corresponding second shielding signal can be determined according to the distance between the screen and the D-IC in different areas, thereby shielding the light-emitting pulse signal used to trigger the pixel circuits in different areas to emit light, realizing the signal gating function of the light-emitting pulse signal. In this way, the pulse frequency of the light-emitting pulse signal corresponding to each area of ​​the screen can be adjusted, sending a light-emitting pulse signal with a lower pulse frequency to the area closer to the D-IC, and sending a light-emitting pulse signal with a higher pulse frequency to the area farther away from the D-IC, so that the brightness between different areas of the screen is as consistent as possible.

[0178] The pixel driving circuit based on the first gating circuit 320 and the pixel driving circuit based on the second gating circuit 350 are two independent circuits, each used to address screen brightness unevenness caused by different reasons. However, when both of these causes of uneven screen brightness exist simultaneously, the pixel driving circuit based on the first gating circuit 320 and the pixel driving circuit based on the second gating circuit 350 can be integrated into a single display panel circuit.

[0179] Figure 12 This is a schematic diagram of another pixel driving circuit 300 proposed in the embodiments of this application.

[0180] The connection relationships between D-IC 310, first gating circuit 320, pixel circuit 330, GOA 340 and second gating circuit 350 are the same as in the previous embodiments, and will be repeated here.

[0181] It should be noted that the k display areas corresponding to the k first gating circuits 320 are arranged along the first direction of the display panel, and the m display areas corresponding to the m second gating circuits 350 are arranged along the second direction of the display panel, with the first direction and the second direction being perpendicular.

[0182] For example, the first direction mentioned above can be along the top or bottom edge of the display panel, and the second direction mentioned above can be along the left or right edge of the display panel; of course, the definitions of the first and second directions can also be interchanged.

[0183] It should be understood that, based on the above Figure 12 The first gating circuit 320 and the second gating circuit 350 in the pixel driving circuit 300 shown are controlled by different shielding signals from the D-IC, and whether the first gating circuit 320 enables the gating function is affected by the second gating circuit 350. For example, a pixel circuit 330 is controlled not to emit light based on the first gating circuit 320, and the pixel circuit 330 is connected to a second gating circuit 350. Since the pixel circuit 330 has already stopped emitting light based on the control of the first gating circuit 320, the second gating circuit 350 can not enable the gating function.

[0184] Based on the above technical solution, the pixel driving circuit based on the first gating circuit 320 and the pixel driving circuit based on the second gating circuit 350 proposed in the embodiments of this application are integrated, which helps the screen to maintain the uniformity of brightness in areas with different refresh rates and areas with different distances from D-IC when the HRD function is enabled.

[0185] Accordingly, based on the signal shielding concept of each pixel driving circuit proposed in the foregoing embodiments, this application also proposes a corresponding signal processing method.

[0186] As described above, when a screen supports HRD functionality, the refresh rates of different areas may vary, resulting in poor brightness uniformity across these areas. Therefore, this application proposes a signal processing method to address the problem of poor brightness uniformity between areas with different refresh rates when the screen performs HRD functionality.

[0187] Figure 13 This is a schematic flowchart of a signal processing method 1300 according to an embodiment of this application. Method 1300 can be applied to a display panel, where multiple areas of the display panel correspond to different refresh rates. Method 1300 includes the following steps:

[0188] S1310: Determine the third light-emitting pulse signal, which is used to control the brightness of the first area of ​​the display panel.

[0189] For example, taking an OLED screen as an example, the D-IC of the OLED screen can actively control the generation and transmission of light-emitting pulse signals to a designated area of ​​the screen (or display panel) so that the pixels in the designated area of ​​the screen emit light. The D-IC can receive control signals and image data from the screen display controller, and then, based on the control signals and image data, determine the desired brightness of each area (including the first area) indicated by the screen display controller, and thus generate the aforementioned first light-emitting pulse signal.

[0190] S1320: Determine the first light-emitting pulse signal based on the third light-emitting pulse signal and the first refresh rate corresponding to the first region, wherein the first refresh rate is negatively correlated with the pulse frequency of the first light-emitting pulse signal, and the pulse frequency of the first light-emitting pulse signal is less than or equal to the pulse frequency of the third light-emitting pulse signal.

[0191] In some possible embodiments, the first refresh rate can be a single value or a range. When the first refresh rate is a range, the size of the range corresponding to the first distance is set based on the screen's hardware performance, such as the time it takes for the screen to maintain brightness without decaying based on the emission pulse signal.

[0192] S1330: Send a first light-emitting pulse signal to the pixel circuit corresponding to the first region.

[0193] It should be understood that the first area mentioned above can be one of multiple areas of the screen. This application embodiment uses the first area as an example to illustrate method 1300. Therefore, method 1300 can also be used to implement brightness control of other areas of the screen, thereby realizing brightness control of all areas of the screen.

[0194] Based on the above method 1300, after completing the brightness control of the entire screen, the final display brightness distribution of the screen is as follows: Figure 14 As shown.

[0195] Figure 14 This is a schematic diagram of screen brightness distribution controlled by method 1300 according to an embodiment of this application.

[0196] refer to Figure 14 As shown, assuming the screen is horizontally divided into 3 areas, corresponding to Figure 14 The refresh rates are D1 to D3, where D1 corresponds to refresh rate f1, D2 corresponds to refresh rate f2, and D3 corresponds to refresh rate f3, with f1 > f2 > f3.

[0197] Since method 1300 proposes that "the first refresh rate is negatively correlated with the pulse frequency of the first light-emitting pulse signal", then combined with Figure 14It can be seen that after the operation of method 1300, the pulse frequency F1 of the light-emitting pulse signal sent to D1 is the smallest, the pulse frequency F2 of the light-emitting pulse signal sent to D2 is slightly increased, and the pulse frequency F3 of the light-emitting pulse signal sent to D3 is the largest.

[0198] After signal processing based on method 1300, although the average brightness of the D3 region, which has the lowest refresh rate, is based on the light-emitting pulse signal 3 without frequency reduction processing, within a unit refresh cycle, it can be the same as or approximately the same as the average brightness of the D1 region, which has the highest refresh rate, is based on the light-emitting pulse signal 1 with frequency reduction processing within a unit refresh cycle. The same applies to the D2 region, thus helping to ensure the uniformity of display brightness among D1, D2, and D3.

[0199] Based on the above technical solution, when the screen implements the HRD function and the refresh rates of multiple areas of the screen are different, considering that the brightness attenuation of areas with low refresh rates is greater than that of areas with high refresh rates, and the average brightness of areas differs greatly in the same unit of time, the pulse frequency of the light emission pulse signal corresponding to each area of ​​the screen is adjusted. A lower pulse frequency light emission pulse signal is sent to the area with a higher refresh rate, and a higher pulse frequency light emission pulse signal is sent to the area with a lower refresh rate. This makes the brightness of each area of ​​the screen as consistent as possible, thereby helping to ensure the uniformity of brightness of each area of ​​the screen and ensuring a good visual experience for the user.

[0200] In some possible embodiments, before performing the above method 1300, the following operation may also be performed: determining a pre-calibrated first correspondence, which is used to indicate the correspondence between the first refresh rate and the first pulse shielding number, which is used to indicate the number of pulses that shield the third light-emitting pulse signal per unit time.

[0201] For example, the first correspondence mentioned above can be represented by the following pre-defined Table 1.

[0202] Table 1

[0203] refresh rate Pulse shielding quantity Refresh rate 1 Number of first pulse shielding units 1 Refresh rate 2 First pulse shielding quantity 2 Refresh rate 3 First pulse shielding quantity 3 …… ……

[0204] In some possible embodiments, the second correspondence described above can be calibrated based on the following experimental method:

[0205] First, assume the screen has m refresh rates, with higher refresh rates at higher levels, and m is greater than 1. The following example uses m greater than 2 as an illustration; the value of m depends on the hardware performance used by the screen to implement the HRD function.

[0206] S1: Enable the HRD function of the screen so that the m areas of the screen (areas D1 to Dm) correspond one-to-one with m refresh rate levels. Among them, the refresh rate of area D1 is level 1 (lowest level), the refresh rate of area D2 is level 2, and so on, with the refresh rate of area Dm being level m (highest level).

[0207] S2: Send the same light pulse signal to m areas of the screen.

[0208] S3: Within a unit cycle of screen refresh in area D1, calculate the average brightness of areas D1 and Dm within that unit cycle, and determine the difference in average brightness between areas D1 and Dm.

[0209] S4: Based on the average brightness of D1 within the above unit period and the number of pulses of the luminous pulse signal, determine the average brightness of each pulse of the luminous pulse signal within the above unit period.

[0210] S5: Based on the average brightness of D1, and according to the average brightness of regions D2 to Dm in the above unit period and the average brightness of each pulse of the light emission pulse signal in the above unit period, determine the number of pulses to be shielded for D2 to Dm respectively. Furthermore, the first correspondence between m refresh rate levels (i.e. m refresh rates) and the number of pulses to be shielded can be determined.

[0211] It should be understood that the screen display brightness formed by D2 to Dm based on the pulse-shielded light emission pulse signal can be consistent with the screen display brightness formed by D1 based on the unshielded light emission pulse signal, thereby ensuring the consistency of the overall average brightness of the screen.

[0212] Therefore, after determining the first correspondence, S1320 can be implemented by the following operation: determining the first pulse shielding quantity according to the first refresh rate and the second correspondence, and shielding M pulses of the third light-emitting pulse signal per unit time to determine the first light-emitting pulse signal.

[0213] The pulse shielding method is as follows: a first shielding signal is determined according to the first pulse shielding quantity, and the pulse of the first shielding signal corresponds to M pulses of the third luminous pulse signal in a unit time in terms of timing; the pulse of the third luminous pulse signal is shielded by the first shielding signal.

[0214] Based on the above technical solution, by using a pre-defined first correspondence, the number of light-emitting pulses that need to be blocked per unit time for the light-emitting pulse signals sent to different refresh rate areas of the screen is determined, thereby ensuring that the average display brightness of each area of ​​the screen after receiving the corresponding light-emitting pulse signal is kept as consistent as possible. Since the first correspondence is pre-defined, it only needs to be called when blocking the light-emitting pulse signal. Therefore, this method is simple in principle, has low computational overhead, and is easy to implement.

[0215] In order for the screen to implement the method 1300 proposed in the embodiments of this application, the embodiments of this application provide a system architecture, which is as follows: Figure 15 As shown.

[0216] Figure 15 This is a schematic diagram of a system architecture 1500 for implementing method 1300 provided in an embodiment of this application.

[0217] Currently, the N-Gate GOA in the internal circuitry of the screen can include multiple shift register circuits (see reference). Figure 15 In the N-Gate GOA-1 to N-Gate GOA-m, multiple shift register circuits are respectively connected to multiple areas of the screen (see reference). Figure 15 The D1 to Dm regions in the N-Gate GOA correspond one-to-one, and the refresh rates of these multiple regions can be the same, partially the same, or different from each other. The input of the first shift register circuit in the N-Gate GOA is connected to the D-IC to receive the STV signal from the D-IC. This triggers the generation of a third light-emitting pulse signal, and the generated output signal (equivalent to the STV signal) is sequentially transmitted down to each cascaded shift register circuit. Furthermore, the output of each shift register is also connected to the D-IC. When the HRD function is enabled on the screen, the third light-emitting pulse signal generated by each shift register is transmitted through the D-IC to the pixel circuit under the corresponding area of ​​the screen, enabling the corresponding area of ​​the screen to display an image with the corresponding brightness.

[0218] As can be seen from the description of the foregoing embodiments, since method 1300 is used to solve the problem of inconsistent average brightness in different refresh rate areas of a screen with HRD function, and the HRD function of the screen is implemented by setting a gating unit (or gating circuit) between each shift register circuit of N-GateGOA and D-IC in the internal circuit of the screen, in method 1300, the gating unit is also used to implement the pulse shielding operation of the third light emission pulse signal to determine the first light emission pulse signal and transmit the first light emission pulse signal to the pixel circuit under the corresponding area.

[0219] In some possible embodiments, the first light-emitting pulse signal can also be sent to the D-IC first, and then forwarded by the D-IC to the corresponding pixel circuit.

[0220] In the system architecture 1500, the D-IC can send a shielding signal to the gating units to trigger different degrees of signal shielding of the received third light-emitting pulse signal by each gating unit. Therefore, each gating unit can also be individually connected to the D-IC via a signal line to receive the shielding signal sent by the D-IC. This shielding signal is determined by the D-IC based on the number of pulses to be shielded per unit time for the third light-emitting pulse signal corresponding to different refresh rate regions. After each gating unit receives the third light-emitting pulse signal and the shielding signal, when the shielding signal is high, the pulse shielding function for the third light-emitting pulse signal is triggered; when the shielding signal is low, pulse shielding of the third light-emitting pulse signal is not performed.

[0221] It should be understood that the control logic of the above-mentioned shielding signal trigger gating unit to shield the third light-emitting pulse signal can be adjusted. For example, when the shielding signal is low, the trigger gating unit can perform pulse shielding function on the third light-emitting pulse signal.

[0222] With the first region (e.g.) Figure 15 Taking D1 as an example, the third emitting pulse signal after the pulse shielding operation of the corresponding gating unit is the first emitting pulse signal mentioned above (corresponding to D1). Figure 15 The first light-emitting pulse signal (1) is transmitted by the gating unit to the pixel circuit under the first area of ​​the screen via the D-IC, so that the first area of ​​the screen can display the image at the corresponding brightness. The same applies to other areas of the screen, and will not be repeated here.

[0223] In some possible embodiments, the system architecture for implementing the above method 1700 can also be adjusted to include Figure 3 The system architecture of the pixel driving circuit 300 is shown.

[0224] In some possible embodiments, taking the first region in the above method 1300 as an example, after determining the first pulse shielding quantity, a first shielding signal can be determined according to the first pulse shielding quantity. The pulse of the second shielding signal corresponds to M pulses of the third light-emitting pulse signal per unit time in terms of timing. Then, the third light-emitting pulse signal and the first shielding signal are input to the gating unit, which corresponds to the first region. The pulse of the first shielding signal is used to trigger the gating unit to shield the third light-emitting pulse signal so that the gating unit outputs the first light-emitting pulse signal.

[0225] It should be noted that the complete waveform of the first shielding signal mentioned above is determined by the D-IC based on the number of pulse shielding signals corresponding to multiple regions, so as to achieve different degrees of shielding of the third light-emitting pulse signals corresponding to multiple regions through a single first shielding signal. The results of multiple gating units shielding the third light-emitting pulse signal based on the second shielding signal can be referenced as follows. Figure 16 .

[0226] Figure 16 This is a schematic diagram of the output waveform of the first light-emitting pulse signal corresponding to each area of ​​the screen according to an embodiment of this application. The pulses in the dashed lines are the pulses that were originally masked out in the third light-emitting pulse signal.

[0227] In some possible embodiments, the first masking signal sent by the D-IC to each gating unit (or gating circuit) is the same. Additionally, refer to... Figure 16 As shown, the third emission pulse signal (i.e., signals EM1 to EMm) corresponding to each region includes 4 pulses per unit time, and the timing interval between each pulse is equal. However, there is a phase difference in timing between the third emission pulse signals acquired by each gating unit. For example, gating unit 1 acquires the EM1 signal first, while gating unit n acquires the EMn signal relatively later, and gating unit m acquires the EMm signal last.

[0228] Assuming that the EMn signal corresponds to the region Dn with the lowest screen refresh rate, then according to the aforementioned embodiment, the gating unit n does not need to perform a shielding operation on the EMn signal. The gating unit n will not shield the pulses in the EMn signal based on the received first shielding signal, that is, the high-level pulse of the first shielding signal will not be synchronized with any pulse in the EMn signal.

[0229] Assuming the EMm signal corresponds to the region Dm with a suitable screen refresh rate, the gating unit m needs to perform a gating operation on the EMm signal. Based on the received first shielding signal, the gating unit m shields one pulse in the EMm signal so that the average screen brightness formed by the pixel circuit under Dm based on the EMm signal with reduced signal strength can be consistent with the average screen brightness of Dn.

[0230] Assuming the EM1 signal corresponds to the area D1 with the highest screen refresh rate, selection unit 1 needs to perform a selection operation on EM1. Based on the received first shielding signal, selection unit 1 shields two pulses in the EM1 signal. That is, a portion of the high-level pulses of the first shielding signal is synchronized with the two pulses in the EM1 signal, so that the average screen brightness of the pixel circuit under D1, based on the signal strength-reduced EM1 signal, can be consistent with the average screen brightness of Dm. After the pixel circuits in all areas receive the corresponding EM signals after the pulse shielding operation, the average display brightness of each area should be consistent.

[0231] It should be understood that the above method 1300 is based on the premise that the screen has the HRD function enabled, and the internal circuit of the screen also realizes the partial refresh of the screen area through the selection unit corresponding to multiple areas of the screen.

[0232] For example, during partial refresh of a screen area, the data signal actually sent by the screen display controller to that area is a complete screen signal. However, since this complete screen signal is only partially different from the previous frame, the selection unit of the internal screen circuit takes effect, shielding the screen signal that is the same as the previous frame and only transmitting the screen signal that is different from the previous frame to the pixel circuit of the corresponding area of ​​the screen, so that the screen of that area is refreshed, thereby realizing the partial refresh function of the screen.

[0233] In some possible embodiments, taking the first region as an example, when the screen of the first region is refreshed, an operation to shield M pulses of the third luminous pulse signal per unit time can be triggered. That is, the method of shielding the luminous pulse signal corresponding to a local area with a high refresh rate through a gating unit proposed in this application embodiment is executed when the local area screen is refreshed, so the gating unit in the above-mentioned system architecture 1500 can be integrated with the gating unit used to implement the gating of the screen local image data signal. In view of this, before shielding the M pulses of the third luminous pulse signal per unit time, a data signal can also be received, which is used to refresh the screen of the first region.

[0234] As described above, the driving voltage input to the internal circuitry of the screen via the D-IC input decreases as the trace load in different areas of the screen increases, resulting in uneven brightness across different areas of the screen. Therefore, this application proposes another signal processing method to solve the aforementioned problem.

[0235] Figure 17 This is a schematic flowchart of a signal processing method 1700 provided in an embodiment of this application.

[0236] S1710: Determine the fourth light-emitting pulse signal, which is used to control the brightness of the second area of ​​the display panel.

[0237] In some possible embodiments, method 1700 can be executed by the D-IC described above, or more specifically, by a processor integrated within the D-IC.

[0238] In some possible embodiments, method 1700 can also be accomplished by the aforementioned D-IC in conjunction with electronic components integrated inside the screen.

[0239] It should be understood that the method for determining the fourth light-emitting pulse signal is the same as that provided in the corresponding embodiment of the aforementioned method 1300, and will not be repeated here.

[0240] In some possible embodiments, in method 1300, the multiple areas of the screen may be divided vertically, while in method 1700, the multiple areas of the screen may be divided horizontally; or, in method 1300, the multiple areas of the screen may be divided horizontally, while in method 1700, the multiple areas of the screen may be divided vertically; or, in both method 1300 and method 1700, the multiple areas of the screen may be divided in the same way.

[0241] For example, multiple areas of the screen correspond to a set of pixel circuits, each set of pixel circuits is connected to a GOA (also called EM GOA) with an integrated light-emitting element via a D-IC, and the EM GOA can be connected to the D-IC via signal lines. The D-IC can implement the above S1710 through the following operation:

[0242] The D-IC can receive control signals and image data from the screen display controller, and then, based on the control signals and image data, send STV signals to the EM GOAs corresponding to multiple sets of pixel circuits through signal lines to trigger each EM GOA to generate scan signals for controlling the on and off of the thin film transistors corresponding to the pixel row (or pixel column), as well as to generate a fourth light emission pulse signal for pixel emission.

[0243] However, in order to achieve uniformity of brightness in multiple areas of the screen, the embodiments of this application require the following steps to be performed on the fourth light-emitting pulse signal.

[0244] S1720: Determine the second light-emitting pulse signal based on the fourth light-emitting pulse signal and the first distance between the second region and the D-IC. The first distance is positively correlated with the pulse frequency of the second light-emitting pulse signal, and the pulse frequency of the second light-emitting pulse signal is less than or equal to the pulse frequency of the fourth light-emitting pulse signal.

[0245] In some possible embodiments, the first distance may be the distance between the edge of the second region near the D-IC and the D-IC, or the distance between the edge of the second region away from the D-IC and the D-IC, or the distance between a reference point in the second region and the D-IC.

[0246] In some possible embodiments, the first distance can be a single value or a range. When the first distance is a range, the size of the range corresponding to the first distance is set according to the hardware performance of the screen, such as the strength of the voltage drop phenomenon during the transmission of the driving voltage in the internal circuit of the screen.

[0247] S1730: Send a second light-emitting pulse signal to the pixel circuit corresponding to the second region.

[0248] It should be understood that the aforementioned fourth light-emitting pulse signal used to control the brightness of the second area of ​​the screen has the following two meanings: First, the fourth light-emitting pulse signal is originally transmitted directly to the second area through the D-IC to make the second area of ​​the screen emit light of a corresponding brightness. Second, based on the aforementioned method 1700, the fourth light-emitting pulse signal is not directly transmitted to the second area through the D-IC, but rather the fourth light-emitting pulse signal is down-frequency processed to determine the second light-emitting pulse signal, so that the screen emits light of a corresponding brightness in the second area based on the second light-emitting pulse signal. Therefore, the fourth light-emitting pulse signal is a signal that participates in the operation of controlling the brightness of the second area, indirectly controlling the brightness of the second area.

[0249] Furthermore, the aforementioned second region can be one of multiple regions of the screen. This application embodiment uses the second region as an example to illustrate method 1700, so method 1700 can also be used to implement brightness control of other regions of the screen, thereby achieving brightness control of all regions of the screen.

[0250] Therefore, based on the above method 1700, after completing the brightness control of the entire screen, the final display brightness distribution of the screen is as follows: Figure 18 As shown.

[0251] Figure 18 This is a schematic diagram of screen brightness distribution controlled by method 1700 provided in an embodiment of this application.

[0252] It should be understood that the pulse frequencies (i.e., the number of pulses per unit time) of the light-emitting pulse signals generated by the multiple shift register circuits in the D-IC-triggered EM GOA are originally the same, for example, they are all the fourth light-emitting pulse signal mentioned above. However, based on the method 1700 described above, the multiple light-emitting pulse signals are processed separately to adjust the pulse frequency of each light-emitting pulse signal. This ensures that even if the light-emitting pulse signal is transmitted to different areas through the internal circuitry of the screen and suffers different degrees of loss, the display brightness generated by each area of ​​the screen after receiving the light-emitting pulse signal is kept as consistent as possible, thereby reducing the brightness difference between different areas.

[0253] refer to Figure 18 As shown, assuming the screen is divided into m regions horizontally, the D-IC circuit of the screen is distributed at the bottom of the screen. For ease of description, in this embodiment, the region adjacent to the D-IC is denoted as D1, the region adjacent to D1 and located above D1 on the screen is denoted as D2, and so on. Then the region located at the top of the screen is denoted as Dm.

[0254] Since method 1700 proposes that "the first distance is positively correlated with the pulse frequency of the second luminous pulse signal," then combining... Figure 18 It can be seen that after the operation of method 1700, the pulse frequency F1 of the light-emitting pulse signal sent to D1 is the smallest; the pulse frequency F2 of the light-emitting pulse signal sent to D2 increases slightly, and so on; the pulse frequency Fm of the light-emitting pulse signal sent to Dm is the largest.

[0255] The pulse frequency of the light-emitting pulse signal sent to various areas of the screen is adjusted to the above numerical relationship based on the following considerations:

[0256] As explained above, a voltage drop occurs during the transmission of the light-emitting pulse signal within the screen's internal circuitry. In other words, the further the light-emitting pulse signal is sent from the D-IC, the more pronounced the voltage drop becomes during transmission. Since the light-emitting pulse signal is generated by a corresponding driving voltage, its amplitude is weakened during transmission. Assuming method 1700 is not executed, there will be a significant difference in signal strength between the light-emitting pulse signal 1 transmitted to D1 and the light-emitting pulse signal m transmitted to Dm, with the light-emitting pulse signal 1 having a stronger signal.

[0257] Based on the method 1700 proposed in this application embodiment, it is determined that D1 is closest to D-IC, so the light-emitting pulse signal 1 is subjected to strong frequency reduction processing to weaken the signal strength of the light-emitting pulse signal 1; in addition, it is determined that Dm is farthest from D-IC, so the light-emitting pulse signal m is not subjected to frequency reduction processing; the same applies to other regions, and only D1 and Dm are described in detail here.

[0258] After signal processing based on method 1700, the signal strength of the light-emitting pulse signal m is somewhat lost during transmission to Dm. This results in the signal strength of the lost light-emitting pulse signal m being close to or even the same as the signal strength of the light-emitting pulse signal 1 after frequency reduction processing, thus helping to ensure the uniformity of display brightness between D1 and Dm. The same principle applies to other areas, and will not be repeated here.

[0259] Based on the above technical solution, considering the voltage drop phenomenon of the light-emitting pulse signals sent to various areas of the screen to control the brightness of the screen display during the transmission process of the internal circuit of the screen, it is possible to adjust the pulse frequency of the light-emitting pulse signals corresponding to each area of ​​the screen so that the signal strength of the light-emitting pulse signals received by each area of ​​the screen is kept as consistent as possible, so that the brightness between various areas of the screen is kept as consistent as possible, thereby helping to ensure the uniformity of brightness in various areas of the screen and ensuring a good visual experience for users.

[0260] In some possible embodiments, before performing the above method 1700, the following operation may also be performed: determining a pre-calibrated second correspondence, which is used to indicate the correspondence between the first distance and the second pulse shielding number, the second pulse shielding number being used to indicate the number of pulses that shield the fourth luminous pulse signal per unit time.

[0261] In some possible embodiments, since a screen can be divided into multiple display areas, and the distances between the multiple display areas and the D-IC can be different, the aforementioned second correspondence can not only indicate the correspondence between the number of second pulse shieldings and the first distance, but also the correspondence between the distances between other areas and the D-IC and the number of second pulse shieldings. This second correspondence can be represented by the following pre-calibrated Table 2.

[0262] Table 2

[0263] Distance between D-IC Pulse shielding quantity Distance 1 Second pulse shielding quantity 1 Distance 2 Second pulse shielding quantity 2 Distance 3 Second pulse shielding quantity 3 …… ……

[0264] In some possible embodiments, the second correspondence described above can be calibrated based on the following experimental method:

[0265] S1: Send the same light-emitting pulse signal to multiple areas of the screen, where the multiple areas include D1 to Dm, m is greater than 1, and D1 is adjacent to D-IC. The distance between D1 and D-IC is denoted as distance 1, the distance between D2 and D-IC is denoted as distance 2, and so on.

[0266] It should be understood that the number of regions a screen can be divided into based on the distance to the D-IC is related to the screen's circuit design. It needs to be determined by the number of shift register circuits in the EM GOA used to control the illumination of the screen's pixel circuits when the screen is not performing HRD functions. That is, one EM GOA includes multiple cascaded shift register circuits, and the signal output of each shift register circuit is used to control the illumination of the pixel circuits in one region of the screen.

[0267] S2: Obtain the display brightness of the above multiple areas based on the light emission pulse signal, so as to determine the brightness difference between D2 to Dm and D1 respectively.

[0268] S3: Determine the brightness value corresponding to each pulse of the light-emitting pulse signal based on the display brightness of D1 and the number of pulses of the light-emitting pulse signal.

[0269] S4: Based on the brightness of Dm, determine the number of pulse shielding corresponding to D1 to D(m-1) according to the brightness difference between D1 to D(m-1) and Dm respectively and the brightness value corresponding to each pulse of the light emission pulse signal. Furthermore, it is possible to determine the second correspondence between the distance between each region and D-IC and the number of pulse shielding.

[0270] It should be understood that the screen display brightness formed by D1 to D(m-1) based on the pulse-shielded light emission pulse signal can be consistent with the screen display brightness formed by Dm based on the unshielded light emission pulse signal, thereby ensuring the uniformity of the overall screen brightness.

[0271] Therefore, after determining the second correspondence mentioned above, S1720 can be implemented by the following operation: determining the second pulse shielding quantity based on the first distance and the first correspondence, wherein the second pulse shielding quantity is N, and N is greater than or equal to 0; shielding N pulses of the fourth luminous pulse signal per unit time to determine the second luminous pulse signal.

[0272] The pulse shielding method is as follows: a second shielding signal is determined based on the second pulse shielding quantity, and the pulses of the second shielding signal correspond to N pulses of the fourth luminous pulse signal per unit time in terms of timing; the pulses of the fourth luminous pulse signal are shielded by the second shielding signal.

[0273] Based on the above technical solution, by using a pre-defined second correspondence, the number of pulses that need to be blocked per unit time for the light-emitting pulse signals sent to different areas of the screen is determined, thereby ensuring that the display brightness formed after each area of ​​the screen receives the corresponding light-emitting pulse signal is as consistent as possible. Since the second correspondence is pre-defined, it only needs to be called when blocking the light-emitting pulse signal. Therefore, this method is simple in principle, has low computational overhead, and is easy to implement.

[0274] In order for the screen to implement the method 300 proposed in the embodiments of this application, the embodiments of this application provide a system architecture, which is as follows: Figure 5 As shown.

[0275] Figure 19 This is a schematic diagram of a system architecture 1900 for implementing method 1700 provided in an embodiment of this application.

[0276] Currently, the internal circuitry of the screen may include an EM GOA composed of multiple cascaded shift register circuits, see reference. Figure 19 In the diagram, EM GOA-1 to EM GOA-m represent m shift register circuits in EM GOA, each of which is associated with a different area of ​​the screen (see reference). Figure 19 The D1 to Dm signals in the EM GOA correspond one-to-one. The signal input terminal of the first shift register circuit in the EM GOA is connected to the D-IC to receive the STV signal from the D-IC to generate the fourth light-emitting pulse signal and the first output signal. Then, the first output signal is transmitted to the next-stage shift register circuit as the input signal (equivalent to the STV signal) of the next-stage shift register circuit, and so on.

[0277] The fourth light-emitting pulse signal generated by each stage of the shift register circuit is finally output to the pixel circuit under the corresponding area of ​​the screen, so that the corresponding area of ​​the screen can achieve the corresponding brightness of the image display.

[0278] As can be seen from the foregoing embodiments, in order to implement the method 1700 of this application, the uniformity of brightness in various areas of the screen can be achieved by shielding a portion of the fourth light-emitting pulse signal generated by each shift register circuit in the EM GOA to different degrees. Therefore, this application proposes to add a gating unit, or gating circuit, between the D-IC and each shift register circuit in the EM GOA to receive the fourth light-emitting pulse signal output by the EM GOA.

[0279] In some possible embodiments, the D-IC can send a shielding signal to the gating units to trigger each gating unit to shield the received fourth luminous pulse signal to different degrees, thereby outputting second luminous pulse signals 1-m with different pulse frequencies. Therefore, each gating unit can also be individually connected to the D-IC via a signal line to receive a second shielding signal determined by the D-IC based on the number of pulses that need to be shielded per unit time for the fourth luminous pulse signal corresponding to different regions. After each gating unit receives the fourth luminous pulse signal and the second shielding signal, when the second shielding signal is high, the pulse shielding function for the fourth luminous pulse signal is triggered; when the second shielding signal is low, pulse shielding of the fourth luminous pulse signal is not performed.

[0280] It should be understood that the control logic of the trigger gating unit of the second shielding signal to shield the fourth light-emitting pulse signal can be adjusted. For example, when the shielding signal is low, the trigger gating unit can perform pulse shielding function on the fourth light-emitting pulse signal.

[0281] With the second region (corresponding to) Figure 19 Taking D1 as an example, the fourth light-emitting pulse signal after the pulse shielding operation of the gating unit is the second light-emitting pulse signal mentioned above (corresponding to D1). Figure 19 The second light-emitting pulse signal 1). Finally, the gating unit transmits the second light-emitting pulse signal to the pixel circuit under the first area of ​​the screen through the D-IC, so that the second area of ​​the screen can realize the display of the image with the corresponding brightness.

[0282] In some possible embodiments, taking the second region in the above method 1700 as an example, after determining the number of second pulse shielding, a second shielding signal can be determined according to the number of second pulse shielding. The pulses of the second shielding signal correspond to N pulses of the fourth light-emitting pulse signal per unit time in terms of timing. Then, the fourth light-emitting pulse signal and the second shielding signal are input to the gating unit, which corresponds to the second region. The pulses of the second shielding signal are used to trigger the gating unit to shield the fourth light-emitting pulse signal so that the gating unit outputs the second light-emitting pulse signal.

[0283] It should be noted that the complete waveform of the aforementioned second shielding signal is determined by the D-IC based on the number of pulse shielding signals corresponding to multiple regions, so as to achieve different degrees of shielding of the fourth light-emitting pulse signals corresponding to multiple regions using a single second shielding signal. The results of multiple gating units shielding the fourth light-emitting pulse signal based on the second shielding signal can be referenced below. Figure 20 .

[0284] Figure 20This is a schematic diagram of the output waveform of the second light-emitting pulse signal corresponding to each area of ​​the screen according to an embodiment of this application. The pulses in the dashed lines are the pulses that were originally masked out in the fourth light-emitting pulse signal.

[0285] In some possible embodiments, the second shielding signal sent by the D-IC to each gating unit is the same. Additionally, refer to... Figure 20 As shown, the fourth emission pulse signal (i.e., signals EM1 to EMm) corresponding to each region includes 4 pulses per unit time, and the timing interval between each pulse is equal. However, there is a phase difference in timing between the fourth emission pulse signals received by each gating unit. For example, gating unit 1 receives the EM1 signal first, while gating unit n receives the EMn signal relatively later, and gating unit m receives the EMm signal last.

[0286] In some possible embodiments, the EMm signal corresponds to the Dm region of the screen that is furthest from the D-IC. Therefore, as described in the previous embodiments, the gating unit m does not need to perform a gating operation on the EMm signal. Based on the received second shielding signal, the gating unit m does not shield the pulses in the EMm signal; that is, the high-level pulses of the second shielding signal are not synchronized with any pulse in the EMm signal. Assuming the EMn signal and the corresponding Dn are located in the middle of the screen, the gating unit n needs to perform a gating operation on the EMn signal. Based on the received second shielding signal, the gating unit n shields one pulse in the EMn signal. That is, a portion of the high-level pulses of the second shielding signal are synchronized with one pulse in the EMn signal. The shielded pulse in the EMn signal reduces the signal strength of the EMn signal, which is equivalent to the signal strength reduction of the EMm signal transmitted from Dn to Dm. This ensures that the screen brightness formed by the pixel circuit under Dn based on the reduced signal strength EMn signal is consistent with the screen brightness of Dm. The EM1 signal corresponds to the D1 closest to the D-IC in each area of ​​the screen. Selection unit 1 needs to perform a selection operation on EM1. Based on the received second shielding signal, selection unit 1 shields two pulses in the EM1 signal. That is, a portion of the high-level pulses of the second shielding signal is synchronized with the two pulses in the EM1 signal. The shielded two pulses in the EM1 signal reduce the signal strength of EM1, which is equivalent to the signal strength reduction of the EMm signal transmitted from D1 to Dm. This ensures that the screen brightness formed by the pixel circuit under D1 based on the signal strength-reduced EM1 signal is consistent with the screen brightness under Dm. After the pixel circuits in all areas receive the corresponding EM signals after the pulse shielding operation, the display brightness of each area should be uniform.

[0287] In some possible embodiments, since the EM1 sent to Dm does not need to be down-frequency operated, the output of EM GOA-m may not have a gating unit m, and EM GOA-m may be directly connected to D-IC.

[0288] In some possible embodiments, the same problems that can be solved by method 1300 may exist for screens with HRD functionality. Therefore, if the problem of poor brightness uniformity among multiple areas of the screen is to be solved as a whole, method 1300 and method 1700 can be combined. By parallelizing these two methods, the overall brightness uniformity of the screen with HRD functionality can be guaranteed.

[0289] Furthermore, embodiments of this application also provide an apparatus for implementing any of the above methods. For example, an apparatus for signal processing is provided, which includes units (or means) for implementing any of the above signal processing methods.

[0290] Figure 21 This is a schematic block diagram of a signal processing apparatus 2100 provided in an embodiment of this application.

[0291] The device 2100 includes:

[0292] The first determining unit 2110 is used to determine the third light-emitting pulse signal, which is used to control the brightness of the first area of ​​the display panel.

[0293] The first processing unit 2120 is used to determine the first light-emitting pulse signal based on the third light-emitting pulse signal and the first refresh rate corresponding to the first region. The first refresh rate is negatively correlated with the pulse frequency of the first light-emitting pulse signal, and the pulse frequency of the first light-emitting pulse signal is less than or equal to the pulse frequency of the third light-emitting pulse signal.

[0294] The first transmitting unit 2130 is used to transmit a first light-emitting pulse signal to the pixel circuit corresponding to the first region.

[0295] In some possible embodiments, the first processing unit 2120 is specifically used to: determine the first pulse shielding quantity according to the first refresh rate and the first correspondence, wherein the first pulse shielding quantity is M, M is greater than or equal to 0, the first correspondence is used to indicate the correspondence between the first refresh rate and the first pulse shielding quantity, and the first pulse shielding quantity is used to indicate the number of pulses of the third light-emitting pulse signal shielded per unit time; shielding M pulses of the third light-emitting pulse signal per unit time to determine the first light-emitting pulse signal.

[0296] In some possible embodiments, the above-described device 2100 further includes:

[0297] The first receiving unit 2140 is used to receive a data signal before shielding M pulses of the third light-emitting pulse signal within a unit time. This data signal is used to refresh the screen of the first area.

[0298] In some possible embodiments, the first processing unit 2120 is specifically used to: determine a first shielding signal based on the first pulse shielding quantity, wherein the pulses of the first shielding signal correspond in timing to M pulses of the third luminous pulse signal per unit time; and shield the pulses of the third luminous pulse signal using the first shielding signal to determine the first luminous pulse signal.

[0299] In some possible embodiments, the first processing unit 2120 is specifically used to: determine a first shielding signal based on the first pulse shielding quantity, wherein the pulses of the first shielding signal correspond in timing to M pulses of the third luminous pulse signal per unit time; and shield the pulses of the third luminous pulse signal using the first shielding signal to determine the first luminous pulse signal.

[0300] In some possible embodiments, the above-described device 2100 further includes:

[0301] The second determining unit 21550 is used to determine the fourth light-emitting pulse signal, which is used to control the brightness of the second area of ​​the display panel.

[0302] The second processing unit 2160 is used to determine the second light-emitting pulse signal based on the fourth light-emitting pulse signal and the first distance between the second region and the D-IC. The first distance is positively correlated with the pulse frequency of the second light-emitting pulse signal, and the pulse frequency of the second light-emitting pulse signal is less than or equal to the pulse frequency of the first light-emitting pulse signal.

[0303] The second transmitting unit 2170 is used to transmit a second light-emitting pulse signal to the pixel circuit corresponding to the second region.

[0304] In some possible embodiments, the second processing unit 2160 is specifically used to: determine the second pulse shielding quantity based on the first distance and the first correspondence, wherein the second pulse shielding quantity is N, N is greater than or equal to 0, the first correspondence is used to indicate the correspondence between the first distance and the second pulse shielding quantity, and the second pulse shielding quantity is used to indicate the number of pulses that shield the fourth luminous pulse signal per unit time; shield N pulses of the fourth luminous pulse signal per unit time to determine the second luminous pulse signal.

[0305] In some possible embodiments, the second processing unit 2160 is specifically used to: determine a second shielding signal based on the second pulse shielding quantity, wherein the pulses of the second shielding signal correspond in timing to N pulses of the fourth luminous pulse signal per unit time; and shield the pulses of the fourth luminous pulse signal using the second shielding signal to determine the second luminous pulse signal.

[0306] In some possible embodiments, the first determining unit 2110, the first processing unit 2120, the first transmitting unit 2130, and the first receiving unit 2140 in the above-described device 2100 can exist as independent parts of the device 2100, and the second determining unit 2150, the second processing unit 2160, and the second transmitting unit 2170 can also exist as independent parts of the device 2100. In other words, the first determining unit 2110, the first processing unit 2120, the first transmitting unit 2130, and the first receiving unit 2140 can each belong to a single device, and the second determining unit 2150, the second processing unit 2160, and the second transmitting unit 2170 can each belong to a single device.

[0307] In some possible embodiments, this application also proposes a signal processing apparatus, which includes a processor and a memory, wherein the processor and the memory are connected together, and the memory is used to store program code, and the processor is used to call the program code to execute any of the signal processing methods proposed in this application.

[0308] This application also proposes a screen, which includes any of the pixel driving circuits, system architectures or devices proposed in this application.

[0309] It should be noted that the screen mentioned in the embodiments of this application can refer to the screen itself in a narrow sense, or to the entire display system in a broad sense, which is the integration of the screen, the display substrate (such as the liquid crystal display substrate, the OLED substrate, etc.) and other functional components.

[0310] This application also proposes an electronic device that includes any pixel driving circuit, system architecture, or device proposed in this application, or includes the screen described above.

[0311] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0312] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0313] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0314] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0315] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0316] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0317] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pixel driving circuit, characterized in that, Applied to display panels, including: Display integrated circuit D-IC(310); k first gating circuits (320), each of the first gating circuits (320) has its input port connected to the first switch circuit (301) of the display panel and the D-IC (310), respectively. The k first gating circuits (320) correspond to the k display areas of the display panel, where k is greater than 1. The first switch circuit (301) is used to transmit data signals for at least one display area. k×i pixel circuits (330), each i pixel circuit (330) is connected to the output port of one of the first gating circuits (320), where i is greater than 1.

2. The pixel driving circuit according to claim 1, characterized in that, The input port of the first gating circuit (320) is connected to the D-IC (310) through the first shielded signal line, and the input port of the first gating circuit (320) is also connected to the first switching circuit (301) through the first data line and the second data line.

3. The pixel driving circuit according to claim 2, characterized in that, The D-IC (310) is configured to send a first shielding signal to the first gating circuit (320), the pulse duration of the first shielding signal being positively correlated with the refresh rate of the display area corresponding to the first gating circuit (320), the first switching circuit (301) being configured to send a first data signal and a second data signal to the first gating circuit (320), the first data signal and the second data signal being used to refresh the screen of two adjacent areas, the first gating circuit (320) being used to output a first light-emitting pulse signal based on the first shielding signal, the first data signal and the second data signal, and when the refresh rate of the display area corresponding to the first gating circuit (320) is less than the refresh rate of the first reference display area, the pulse frequency of the first light-emitting pulse signal is greater than the pulse frequency of the light-emitting pulse signal input to the first reference display area.

4. The pixel driving circuit according to claim 3, characterized in that, The pixel circuit (330) includes: The first gate transistor (331) is connected to the first gate circuit (320) corresponding to the pixel circuit (330) to receive the first light emission pulse signal. The first light emission pulse signal is used to control the first gate transistor (331) to be turned on or off. A light-emitting element (332) is connected to the current output terminal of the first gate transistor (331).

5. The pixel driving circuit according to claim 4, characterized in that, The pixel driving circuit also includes: A gate driver array GOA (340) includes m shift register circuits (341), each of the shift register circuits (341) being connected to the D-IC (310), wherein m is greater than 1; There are m second gating circuits (350), the input ports of the m second gating circuits (350) are connected to the m shift register circuits (341), and the output port of each second gating circuit (350) is connected to j pixel circuits (330), where m×j=k×i, and the m second gating circuits (350) correspond to the m display areas of the display panel respectively.

6. The pixel driving circuit according to claim 5, characterized in that, The GOA (340) is either an EM GOA or an N-type semiconductor gate GOA.

7. The pixel driving circuit according to claim 5 or 6, characterized in that, The input port of the second gating circuit (350) is connected to the D-IC (310) via the second shielded signal line.

8. The pixel driving circuit according to claim 7, characterized in that, The D-IC (310) is also configured to send the second shielding signal to the second gating circuit (350) and to send a start pulse signal to the GOA (340). The second shielding signal is different from the first shielding signal. The pulse duration of the second shielding signal is negatively correlated with the distance between the display area corresponding to the second gating circuit (350) and the D-IC (310). The second gating circuit (350) is used to output a second light-emitting pulse signal based on the second shielding signal and the output signal from the shift register circuit (341). When the distance between the display area corresponding to the second gating circuit (350) and the D-IC (310) is less than the distance between the second reference display area and the D-IC (310), the pulse frequency of the first light-emitting pulse signal is less than the pulse frequency of the light-emitting pulse signal input to the second reference display area.

9. The pixel driving circuit according to claim 8, characterized in that, The k display areas are arranged along a first direction of the display panel, and the m display areas are arranged along a second direction of the display panel, wherein the first direction is perpendicular to the second direction.

10. The pixel driving circuit according to claim 8 or 9, characterized in that, The pixel circuit (330) also includes: The second gate transistor (333) has its control electrode connected to the second gate circuit (350) corresponding to the pixel circuit (330) to receive the second light-emitting pulse signal. The second light-emitting pulse signal is used to control the second gate transistor (333) to be turned on or off. The first gate transistor (331) is located between the light-emitting element (332) and the second gate transistor (333).

11. A signal processing method, characterized in that, Applied to a pixel driving circuit as described in any one of claims 1 to 10, wherein multiple areas of the display panel correspond to different refresh rates, the method includes: A third light-emitting pulse signal is determined, the third light-emitting pulse signal being used to control the brightness of a first area of ​​the display panel; A first light-emitting pulse signal is determined based on the third light-emitting pulse signal and the first refresh rate corresponding to the first region. The first refresh rate is negatively correlated with the pulse frequency of the first light-emitting pulse signal, and the pulse frequency of the first light-emitting pulse signal is less than or equal to the pulse frequency of the third light-emitting pulse signal. The first light-emitting pulse signal is sent to the pixel circuit corresponding to the first region.

12. The method according to claim 11, characterized in that, The step of determining the first light-emitting pulse signal based on the third light-emitting pulse signal and the first refresh rate corresponding to the first region includes: Based on the first refresh rate and the first correspondence, the first pulse shielding quantity is determined. The first pulse shielding quantity is M, where M is greater than or equal to 0. The first correspondence is used to indicate the correspondence between the first refresh rate and the first pulse shielding quantity. The first pulse shielding quantity is used to indicate the number of pulses that shield the third light-emitting pulse signal per unit time. The first luminous pulse signal is determined by shielding M pulses of the third luminous pulse signal per unit time.

13. The method according to claim 12, characterized in that, Before shielding the M pulses of the third luminous pulse signal within a unit time, the method further includes: A data signal is received, which is used to refresh the screen of the first area.

14. The method according to claim 12 or 13, characterized in that, The shielding of M pulses of the third luminous pulse signal per unit time includes: The first shielding signal is determined based on the first pulse shielding quantity, and the pulses of the first shielding signal correspond in time to M pulses of the third luminous pulse signal per unit time. The pulse of the third luminous pulse signal is shielded by the first shielding signal.

15. The method according to any one of claims 11 to 14, characterized in that, The method further includes: A fourth light-emitting pulse signal is determined, the fourth light-emitting pulse signal being used to control the brightness of the second area of ​​the display panel; Based on the fourth light-emitting pulse signal and the first distance between the second region and the display integrated circuit D-IC, a second light-emitting pulse signal is determined. The first distance is positively correlated with the pulse frequency of the second light-emitting pulse signal, and the pulse frequency of the second light-emitting pulse signal is less than or equal to the pulse frequency of the first light-emitting pulse signal. The second light-emitting pulse signal is sent to the pixel circuit corresponding to the second region.

16. The method according to claim 15, characterized in that, Determining the second emitting pulse signal based on the fourth emitting pulse signal and the first distance between the second region and the D-IC includes: Based on the first distance and the second correspondence, the second pulse shielding quantity is determined, where the second pulse shielding quantity is N, and N is greater than or equal to 0. The second correspondence is used to indicate the correspondence between the first distance and the second pulse shielding quantity, and the second pulse shielding quantity is used to indicate the number of pulses that shield the fourth luminous pulse signal per unit time. The N pulses of the fourth luminous pulse signal per unit time are shielded to determine the second luminous pulse signal.

17. The method according to claim 16, characterized in that, The shielding of N pulses per unit time of the fourth luminous pulse signal includes: Based on the second pulse shielding quantity, a second shielding signal is determined, and the pulses of the second shielding signal correspond in timing to N pulses of the fourth luminous pulse signal per unit time. The pulse of the fourth luminous pulse signal is shielded by the second shielding signal.

18. A screen, characterized in that, Includes the pixel driving circuit as described in any one of claims 1 to 10.

19. An electronic device, characterized in that, It includes the pixel driving circuit as described in any one of claims 1 to 10, or the screen as described in claim 18.

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