Display driving method, display driving circuit and display panel

Abstract

The invention discloses a display driving method, a display driving circuit and a display panel, and the method comprises the steps: setting the pulse width of a first subarea scanning driving signal corresponding to a second display region and the pulse width of a second subarea scanning driving signal corresponding to a first display region according to the second display region and the first display region; the pulse width of the second subarea scanning driving signal is larger than the pulse width of the first subarea scanning driving signal, and the difference of pressure testing of transistors in the first display area and the second display area is reduced by increasing the positive bias stability testing time of the transistors in the pixel driving units in the first display area; therefore, the problem that the threshold voltage of the transistor in the high-frequency area is positively biased after long-time reliability test is compensated, and the purpose of solving the problem of dark display in the high-brush area is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a display driving method, a display driving circuit, and a display panel. Background Art

[0002] As people's living standards improve, electronic products play an important role in people's lives. Display panels are important components of electronic products, so the demand for display panels is increasing. The active-matrix organic light-emitting diode (AMOLED) low-temperature polycrystalline oxide (LTPO) 3.0 partition refresh display technology currently on the market can realize the function of displaying different refresh rates in multiple areas of a mobile phone, such as watching videos (requiring high refresh rate display) and reading text (low refresh rate display) on a mobile phone at the same time. It also has the advantage of saving power, that is, the power consumption of the low refresh area will be reduced.

[0003] In the related art, due to the inconsistent turn-on frequency of the Indium Gallium Zinc Oxide (IGZO) transistors in the LTPO3.0 low refresh display area and the high refresh display area, there is a problem of poor display effect. Summary of the invention

[0004] In view of the above problems, the present application provides a display driving method, a display driving circuit, and a display panel, aiming to solve the problem that the display image in the second display area of ​​the display panel is dark after a long-term reliability test.

[0005] A first aspect of an embodiment of the present application provides a display driving method, which is applied to a display panel. The display driving method includes:

[0006] Determine a first display area and a second display area of ​​the display panel; wherein a refresh frequency of the first display area is less than a refresh frequency of the second display area;

[0007] According to the first display area and the second display area, setting a pulse width of a first subarea scanning driving signal corresponding to the second display area and a pulse width of a second subarea scanning driving signal corresponding to the first display area; wherein the pulse width of the second subarea scanning driving signal is greater than the pulse width of the first subarea scanning driving signal;

[0008] The pixel driving unit in the first display area is controlled to generate a corresponding pixel driving signal according to the second partition scanning driving signal and the data signal, so as to drive the display pixels in the first display area to light up at a preset refresh frequency.

[0009] In some embodiments, the display driving method further includes:

[0010] Obtaining a reliability test time of the display panel;

[0011] The pulse widths of the first sub-area scanning driving signal and the second sub-area scanning driving signal are determined according to the reliability test time.

[0012] In some embodiments, the reliability test time is positively correlated with a pulse width of the second partition scan driving signal.

[0013] In some embodiments, the display driving method further includes:

[0014] According to the time from when the display panel is first lit to when it is currently used, determining a corresponding target pulse width from a preset time-pulse-width relationship table;

[0015] The pulse width of the second partition scanning driving signal is set to a target pulse width.

[0016] In some embodiments, the time from when the display panel is first lit to when it is currently used is positively correlated with the target pulse width.

[0017] In some embodiments, the display driving method further includes:

[0018] Obtaining an absolute value of a difference between image refresh rates of the first display area and the second display area;

[0019] The pulse width of the second subarea scanning driving signal is determined according to the absolute value of the difference in the picture refresh rates.

[0020] In some embodiments, the difference in the frame refresh rate is positively correlated with the pulse width of the second sub-area scanning driving signal.

[0021] A second aspect of the embodiments of the present application further provides a display driving circuit, which is applied to a display panel, wherein the display panel includes a plurality of display pixels; the display driving circuit includes a plurality of pixel driving units and a main control circuit, wherein the main control circuit is used to execute the display driving method described in any one of the above embodiments;

[0022] The plurality of pixel driving units are used to respectively drive the plurality of display pixels to light up.

[0023] In some embodiments, the display driving circuit further includes a plurality of scanning driving modules, and the plurality of gate scanning lines are respectively connected to the plurality of scanning driving modules;

[0024] The scanning driving module is controlled by the main control circuit to provide gate scanning driving signals for the plurality of gate scanning lines, and the plurality of pixel driving units are respectively connected to corresponding gate scanning lines;

[0025] Each of the pixel driving units is used to drive the corresponding display pixel to light up according to the received gate scanning driving signal and data signal.

[0026] A third aspect of the embodiments of the present application further provides a display panel, which includes the display driving circuit as described in any one of the above embodiments.

[0027] The beneficial effects of the embodiments of the present application: the pulse width of the first partition scanning drive signal corresponding to the second display area and the pulse width of the second partition scanning drive signal corresponding to the first display area are set according to the second display area and the first display area, so that the pulse width of the second partition scanning drive signal is greater than the pulse width of the first partition scanning drive signal, and the difference in stress tests of transistors in the first display area and the second display area is narrowed by increasing the positive bias stability test time of the transistors in the pixel driving unit in the first display area, that is, compensating for the problem of positive bias of the threshold voltage of transistors in the high-frequency area after long-term reliability testing, thereby solving the problem of dark display in the high refresh area.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 A first schematic diagram of a display driving method provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of waveforms of second subarea scanning drive signals in the second display area and the first display area provided in an embodiment of the present application;

[0032] Figure 3A second schematic diagram of a display driving method provided in an embodiment of the present application;

[0033] Figure 4 A third schematic diagram of the display driving method provided in an embodiment of the present application;

[0034] Figure 5 A fourth schematic diagram of a display driving method provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of a display driving circuit provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of a pixel driving unit provided in an embodiment of the present application;

[0037] Figure 8 A driving timing diagram of a pixel driving unit of an 8T1C pixel architecture provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The phrase "second connection port" at various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the related technology, since the turn-on frequencies of the Indium Gallium Zinc Oxide (IGZO) transistors in the first display area and the second display area of ​​LTPO3.0 are inconsistent and the degree of the forward bias stability test (PBS) of the IGZO tube is different, the threshold voltage of the IGZO in the high-frequency area is positively biased after a long-term reliability test (RA test), resulting in a dark display problem.

[0043] In order to solve the above technical problems, the present application embodiment provides a display driving method, see Figure 1 As shown, the display driving method in this embodiment includes steps S100 to S300.

[0044] In step S100, a first display area and a second display area of ​​the display panel are determined.

[0045] In this embodiment, the refresh rate of the first display area is lower than the refresh rate of the second display area; the first display area refers to an area in the display panel that uses a lower refresh rate for display, and the second display area refers to an area in the display panel that uses a higher refresh rate for display. When the display panel displays a picture, it can display a low refresh rate picture in some areas according to user needs or picture display needs. For example, in a part of the area where only text needs to be displayed, the display refresh rate of the area can be reduced to achieve the purpose of reducing display power consumption.

[0046] In some embodiments, the image refresh rate of the first display area may be less than 30 Hz.

[0047] In some embodiments, the frame refresh rate of the first display area may be 1 Hz.

[0048] In some embodiments, the image refresh rate of the second display area may be greater than 100 Hz.

[0049] In some embodiments, the image refresh rate of the second display area may be 120 Hz or 144 Hz.

[0050] In step S200, according to the first display area and the second display area, a pulse width of a first subarea scanning driving signal corresponding to the second display area and a pulse width of a second subarea scanning driving signal corresponding to the first display area are set.

[0051] In this embodiment, when the partition refresh function of the display panel is turned on, the refresh frequencies of the display images in various areas may be inconsistent. For example, the refresh frequencies of the display images in the upper, middle and lower areas of the display panel are 1Hz, 120Hz and 1Hz respectively. Since the opening frequencies of the indium gallium zinc oxide IGZO transistors in the first display area and the second display area are inconsistent, the degree of the positive bias stability test (PBS) of the IGZO tube is different. After a long reliability test (RA test), the threshold voltage of the IGZO in the high-frequency area is positively biased, and there is a problem of dark display. In this embodiment, by setting the pulse width of the second partition scanning drive signal to be greater than the pulse width of the first partition scanning drive signal, by increasing the positive bias stability test time of the transistor in the pixel driving unit in the first display area, the difference in the stress test of the transistor in the first display area and the second display area is reduced, that is, the problem of the positive bias of the threshold voltage of the transistor in the high-frequency area after the long reliability test is compensated, so as to achieve the purpose of solving the problem of dark display in the high refresh area.

[0052] In step S300, the pixel driving unit in the first display area is controlled to generate a corresponding pixel driving signal according to the second partition scanning driving signal and the data signal, so as to drive the display pixels in the first display area to light up at a preset refresh frequency.

[0053] In this embodiment, the display panel includes a plurality of display pixels, and the plurality of display pixels may be arranged in an array, and each display pixel is driven by a corresponding pixel driving unit, and the pixel driving unit may generate a corresponding pixel driving signal according to a received gate scanning driving signal and a corresponding subarea scanning driving signal, so as to drive the display pixels in the first display area and the second display area to light up according to the display refresh rate set therein. In the first display area, the pixel driving unit may generate a corresponding pixel driving signal according to the received gate scanning driving signal and the second subarea scanning driving signal, so as to drive the display pixels in the first display area to light up, and in the second display area, the pixel driving unit may generate a corresponding pixel driving signal according to the received gate scanning driving signal and the first subarea scanning driving signal, so as to drive the display pixels in the second display area to light up, and the plurality of display pixels in the second display area and the first display area may display corresponding images when driven to light up.

[0054] In some embodiments, the pixel driving unit may be an 8T1C pixel architecture, and the partition driving transistor in the 8T1C pixel architecture may be an IGZO transistor. The partition driving transistor determines the display refresh rate of the display pixel corresponding to its pixel driving unit according to the received partition scanning driving signal. In this way, the main control circuit controls the corresponding pixel driving unit according to the first display area to generate a pixel driving signal with a lower duty cycle, thereby achieving the effect of reducing the display screen refresh rate of the first display area.

[0055] Combination Figure 2 As shown, taking the refresh rate of the second display area as 120Hz and the refresh rate of the first display area as 1Hz as an example, N1 represents the voltage of the gate of the partition driving transistor in the pixel driving unit, and the gate of the partition driving transistor is used to receive the corresponding partition scanning driving signal SN2. In the second display area, the pulse width of the first partition scanning driving signal is t1, and the pulse width of the second partition scanning driving signal is t2. Under the control of the corresponding partition scanning driving signal, the partition driving transistor is in the PBS and NBS cycle state. By setting the pulse width t2 of the second partition scanning driving signal to be greater than the pulse width t1 of the first partition scanning driving signal, the PBS time of the partition driving transistor in the first display area can be increased, thereby reducing the difference in the stress test of the transistors in the first display area and the second display area, that is, compensating for the problem of the positive bias of the threshold voltage of the transistor in the high-frequency area after a long-term reliability test, so as to achieve the purpose of solving the problem of dark display in the high-refresh area.

[0056] In some embodiments, see Figure 3 As shown, the display driving method in this embodiment further includes step S410 and step S420.

[0057] In step S410, the reliability test time of the display panel is obtained.

[0058] In step S420, the pulse widths of the first sub-area scanning driving signal and the second sub-area scanning driving signal are determined according to the reliability test time.

[0059] In this embodiment, since the RA reliability test is an experiment to simulate the aging and attenuation of the display panel with long-term use, for example, the service life of the mobile phone and the RA time course can be obtained from previous tests, such as the use of the display panel for 1 year is approximately equal to 60 hours of RA test, and the use of the display panel for 2 years is approximately equal to 120 hours of RA test, etc. Therefore, the reliability test time of the display panel is positively correlated with the use time of the display panel, and the longer the reliability test time of the display panel, the higher the compensation degree of the positive bias of the threshold voltage of the IGZO transistor in the second display area, and the more the PBS time of the IGZO transistor in the first display area needs to be increased, and therefore, the pulse width of the second partition scanning drive signal received by the partition scanning transistor (such as the IGZO transistor) in the first display area needs to be larger. It should be noted that the use time of the display panel in this application can be the time from the first lighting of the display panel to the current use. Therefore, the high-level pulse width of the second partition scanning drive signal can be obtained according to the reliability test time of the actual debugging of the display panel. For example, when the RA test is 60H, the pulse width of the second partition scanning drive signal is set to t2, which can improve the problem of dark display in the high refresh area. When the RA test is 120H, the pulse width of the second partition scanning drive signal is set to t3, which can improve the problem of dark display in the high refresh area.

[0060] In some embodiments, the reliability test time is positively correlated with a pulse width of the second partition scan driving signal.

[0061] In this embodiment, the reliability test time of the display panel is positively correlated with the use time of the display panel, and the longer the reliability test time of the display panel, the higher the compensation degree of the threshold voltage positive bias of the IGZO transistor in the second display area, and the more the PBS time of the IGZO transistor in the first display area needs to be increased, so the pulse width of the second partition scanning drive signal received by the partition scanning transistor (such as IGZO transistor) in the first display area needs to be larger. Therefore, the high-level pulse width of the second partition scanning drive signal can be obtained according to the reliability test time actually debugged by the display panel.

[0062] As shown in Table 1, the RA test time is used to represent the corresponding years of use of the mobile phone. For example, when the RA test is 0H, the pulse width of the second partition scanning drive signal is set to t1, and when the RA test is 60H, the pulse width of the second partition scanning drive signal is set to t2, which can improve the problem of dark display in the high refresh area. When the RA test is 120H, the pulse width of the second partition scanning drive signal is set to t3, which can improve the problem of dark display in the high refresh area. When the RA test is 240H, the pulse width of the second partition scanning drive signal is set to t4, which can improve the problem of dark display in the high refresh area. When the RA test is 500H, the pulse width of the second partition scanning drive signal is set to t5, which can improve the problem of dark display in the high refresh area. When the RA test is 1000H, the pulse width of the second partition scanning drive signal is set to t6, which can improve the problem of dark display in the high refresh area, and so on.

[0063] Table 1:

[0064] Mobile phone usage years / year RA time / hour (H) SN2 high level pulse width 0 0 t1 1 60 t2 2 120 t3 3 240 t4 4 500 t5 5 1000 t6

[0065] In some embodiments, t6>t5>t4>t3>t2>t1.

[0066] In some embodiments, see Figure 4 As shown, the display driving method in this embodiment further includes: step S510 and step S520.

[0067] In step S510, a corresponding target pulse width is determined from a preset time-to-pulse width relationship table according to the time from when the display panel is first lit to when it is currently used.

[0068] In step S520, the pulse width of the second partition scan driving signal is set to a target pulse width.

[0069] In this embodiment, the reliability test time of the display panel is positively correlated with the use time of the display panel. A time pulse width relationship table can be established based on the actual use and debugging time of the display panel in the RA test. For example, RA test 60H is equivalent to the use time of the display panel for 1 year, RA test 120H is equivalent to the use time of the display panel for 2 years, and so on. In actual use, the use time of the display panel is obtained, and the corresponding target pulse width is determined from the preset time pulse width relationship table, and then the pulse width of the second partition scanning drive signal is set to the target pulse width, thereby reducing the difference in the stress test of the transistors in the first display area and the second display area, that is, compensating for the problem of positive bias of the threshold voltage of the transistors in the high-frequency area after long-term reliability testing, so as to achieve the purpose of solving the problem of dark display in the high-refresh area.

[0070] In some embodiments, in step S510 and step S520, when the usage time of the display panel reaches a preset time node, the corresponding target pulse width is determined from a preset time pulse width relationship table according to the usage time of the display panel, and then the pulse width of the second partition scanning drive signal is set to the target pulse width.

[0071] In some embodiments, the preset time nodes for setting the pulse width of the second partition scan driving signal may be linear nodes, that is, the intervals between adjacent time nodes are the same.

[0072] In some embodiments, the usage time of the display panel is positively correlated with the target pulse width.

[0073] In this embodiment, the longer the display panel is used, the higher the compensation degree of the positive bias of the threshold voltage of the IGZO transistor in the second display area is, and the more the PBS time of the IGZO transistor in the first display area needs to be increased, so the pulse width of the second partition scanning drive signal received by the partition scanning transistor (such as the IGZO transistor) in the first display area needs to be larger. During the use of the display panel, as the use time of the display panel gradually increases, the high level pulse width of the second partition scanning drive signal can be obtained from the preset time pulse width relationship table according to the use time of the display panel, so as to select a suitable target pulse width to adjust the high level pulse width of the second partition scanning drive signal, so as to improve the problem of dark display in the high refresh area.

[0074] In some embodiments, see Figure 5 As shown, the display driving method in this embodiment further includes step S610 and step S620.

[0075] In step S610, the absolute value of the difference between the frame refresh rates of the first display area and the second display area is obtained.

[0076] In step S620, the pulse width of the second subarea scanning driving signal is determined according to the absolute value of the difference in the frame refresh rate.

[0077] In this embodiment, the first display area represents an area in the display panel that is displayed at a lower refresh rate, and the second display area represents an area in the display panel that is displayed at a higher refresh rate. Since the picture refresh rate of the second display area is higher, after a long RA test, the threshold voltage of the IGZO transistor in the second display area is positively biased, and the degree of the positive bias of the threshold voltage is related to the absolute value of the difference between the picture refresh rates of the first display area and the second display area. By setting the pulse width of the second sub-area scanning driving signal in the first display area to be greater than the pulse width of the first sub-area scanning driving signal in the second display area, the positive bias stability test time of the transistor in the pixel driving unit in the first display area is increased, and the positive bias stability test time of the transistor in the pixel driving unit in the first display area can be set to be related to the picture refresh rate of the first display area. In this way, according to the absolute value of the difference between the picture refresh rates of the first display area and the second display area, the pulse width of the second sub-area scanning driving signal in the first display area is adjusted to reduce the difference in the stress test of the transistors in the first display area and the second display area, that is, the problem of the positive bias of the threshold voltage of the transistor in the high-frequency area after a long reliability test is compensated, so as to achieve the purpose of solving the problem of dark display in the high-refresh area.

[0078] In some embodiments, the absolute value of the difference in the frame refresh rate is positively correlated with the pulse width of the second sub-area scanning driving signal.

[0079] In this embodiment, the greater the absolute value of the difference in picture refresh rate between the first display area and the second display area, the greater the difference in stress test of transistors in the first display area and the second display area. Therefore, the pulse width of the second partition scanning drive signal is greater. In this way, the problem of positive bias of the threshold voltage of transistors in the high-frequency area after long-term reliability testing can be compensated, thereby achieving the purpose of solving the dark display in the high-refresh area.

[0080] In some embodiments, the display driving method in this embodiment further includes: generating a corresponding subarea scanning driving signal according to the first display area to control the corresponding pixel driving unit to reduce the duty cycle of the pixel driving signal.

[0081] In this embodiment, the scanning area where the display refresh rate needs to be reduced is determined by the first display area, thereby generating a corresponding partition scanning drive signal, and the partition scanning drive signal is used to control the corresponding pixel driving unit to reduce the duty cycle of the pixel driving signal, thereby achieving a reduction in the switching duty cycle of the pixels in the corresponding area, thereby partitioning the display panel and reducing the display refresh rate in the first display area.

[0082] The embodiment of the present application also provides a display driving circuit applied to a display panel, wherein the display panel includes a plurality of display pixels. Figure 6As shown, the display driving circuit in the embodiment of the present application includes multiple pixel driving units 530 and a main control circuit 510. The main control circuit 510 is used to execute the display driving method in any of the above embodiments; the multiple pixel driving units 530 are used to drive multiple display pixels to light up respectively.

[0083] In this embodiment, a plurality of display pixels may be arranged in an array, each display pixel is driven by a corresponding pixel driving unit 530, and the pixel driving unit 530 may generate a pixel driving signal according to the received gate scanning driving signal, thereby driving the corresponding display pixel to light up, and the plurality of display pixels may display corresponding images when driven to light up. The main control circuit 510 may control the corresponding pixel driving unit 530 to generate a pixel driving signal with a lower duty cycle according to the first display area, thereby reducing the refresh rate of the display image of the first display area.

[0084] In some embodiments, in combination Figure 6 As shown, the partitioned scanning drive signal can also be logically processed with the scanning drive signal output by the scanning drive module 520, so as to adjust the duty cycle of the scanning drive signal output to the gate scanning line 501, thereby achieving the purpose of controlling the corresponding pixel driving unit to reduce the duty cycle of the pixel driving signal, thereby realizing the partitioned refresh display of the display panel.

[0085] In some embodiments, the main control circuit 510 can provide a corresponding partition scanning drive signal to the scanning drive module 520 according to the content to be displayed on the display panel, so as to adjust the refresh rate of the corresponding display screen. For example, according to the coordinates of the display screen and the refresh rate requirements, by providing a corresponding partition scanning drive signal to the display driving method, the refresh rate of the display screen is set according to a frequency distribution such as 60hz-120hz-60hz, 30hz-120hz-30hz, 1hz-120hz-1hz, etc. Specifically, in realizing the function of displaying different refresh rates in multiple regions of a mobile phone, if the mobile phone is watching a video (requiring a high refresh rate display) and reading text (low refresh rate display) at the same time, the refresh rate of the text display area in the display screen is set to a low refresh rate (such as 1Hz, 30Hz, etc.), thereby reducing the power consumption of the display panel without affecting the display effect.

[0086] In some embodiments, in combination Figure 6As shown, the display driving circuit also includes a plurality of scanning driving modules 520, and a plurality of gate scanning lines 501 are respectively connected to the plurality of scanning driving modules 520; the main control circuit 510 outputs corresponding scanning control signals (SWN, SWN+1) to the scanning driving modules 520, and the scanning driving modules 520 are controlled by the main control circuit 510 to provide gate scanning driving signals for the plurality of gate scanning lines 501, and a plurality of pixel driving units 530 are respectively connected to the corresponding gate scanning lines 501; each pixel driving unit 530 is used to drive the corresponding display pixel to light up according to the received gate scanning driving signal and data signal.

[0087] In this embodiment, combined with Figure 6 As shown, the display panel may include N+1 rows of display pixels, each row of display pixels corresponds to a gate scan line 501, each gate scan line 501 is connected to a corresponding scan drive module 520, the main control circuit 510 provides a scan control signal SWN for the Nth scan drive module 520, the main control circuit 510 provides a scan control signal SWN+1 for the N+1th scan drive module 520, and the N+1 scan drive modules 520 provide gate scan drive signals for multiple gate scan lines 501 according to the corresponding scan control signals.

[0088] In some embodiments, the main control circuit 510 may also control the scan driving module 520 to provide a partition scan driving signal to the corresponding pixel driving unit 530, thereby adjusting the display refresh rate of the display area of ​​the display panel.

[0089] In some embodiments, see Figure 7 As shown, the pixel driving unit 530 includes: a first driving tube T1, a second switching tube T2, a partition driving transistor T3, a scanning driving transistor T4, a fifth switching tube T5, a sixth switching tube T6 and a storage capacitor Cst.

[0090] In this embodiment, the first end of the second switch tube T2 is used to receive the display data signal Data, and the control end of the second switch tube T2 is used to receive the first data control signal SP1; the control end of the scan drive transistor T4 is used to receive the gate scan drive signal SN1, and the control end of the partition drive transistor T3 is used to receive the partition scan drive signal SN2.

[0091] In some embodiments, the sub-area scanning driving signal SN2 may be provided by a level conversion circuit to implement sub-area refresh control of the pixel driving unit 530 .

[0092] The control end of the fifth switch tube T5 and the controller of the sixth switch tube T6 are connected in common, and are used to receive the light-emitting control signal EM; the control end of the seventh switch tube T7 and the control end of the eighth switch tube T8 are connected in common, and are used to receive the second data control signal SP2. The first end of the fifth switch tube T5 and the first end of the storage capacitor Cst are connected in common to the first power supply terminal ELVDD, the second end of the second switch tube T2, the second end of the fifth switch tube T5, and the first end of the first drive tube T1 are connected in common, the second end of the storage capacitor Cst, the control end of the first drive tube T1, and the first end of the partition drive transistor T3 are connected in common, the second end of the partition drive transistor T3, the first end of the scan drive transistor T4, the second end of the first drive tube T1, the first end of the sixth switch tube T6, and the first end of the eighth switch tube T8 are connected in common, and the second end of the scan drive transistor T4 is connected to the first reference signal terminal Vrefn1.

[0093] The second end of the sixth switch tube T6 and the first end of the seventh switch tube T7 are connected to the positive electrode of the display pixel, the negative electrode of the display pixel is connected to the reference ground, the second end of the seventh switch tube T7 is connected to the second reference signal terminal Vrefn2, and the second end of the eighth switch tube T8 is connected to the third reference signal terminal Vrefp.

[0094] In some embodiments, the second switch tube T2, the seventh switch tube T7, the eighth switch tube T8, the fifth switch tube T5 and the sixth switch tube T6 are N-type MOS tubes; the partition driving transistor T3 and the scan driving transistor T4 are P-type MOS tubes.

[0095] In some embodiments, the partition driving transistor T3 and the scan driving transistor T4 are IGZO transistors.

[0096] In the pixel driving unit in the first display area, the timing sequence of the first data control signal SP1, the second data control signal SP2, the light emitting control signal EM, the partition scanning driving signal SN2 and the gate scanning driving signal SN1 is as follows: Figure 8 As shown, combined Figure 2 , Figure 7 as well as Figure 8As shown, taking the refresh rate of the second display area as 120Hz and the refresh rate of the first display area as 1Hz as an example, N1 represents the voltage of the gate of the partition driving transistor in the pixel driving unit, and the gate of the partition driving transistor is used to receive the corresponding partition scanning driving signal SN2. In the second display area, the pulse width of the first partition scanning driving signal is t1, and the pulse width of the second partition scanning driving signal is t2. Under the control of the corresponding partition scanning driving signal, the partition driving transistor T3 is in the PBS and NBS cycle state. By setting the pulse width t2 of the second partition scanning driving signal to be greater than the pulse width t1 of the first partition scanning driving signal, the PBS time of the partition driving transistor T3 in the first display area can be increased, thereby reducing the difference in the stress test of the transistors in the first display area and the second display area, that is, compensating for the problem of the positive bias of the threshold voltage of the transistor in the high-frequency area after a long-term reliability test, so as to achieve the purpose of solving the problem of dark display in the high-refresh area.

[0097] In some embodiments, the main control circuit 510 is also used to execute step S400 in the above embodiment. The main control circuit 510 generates a corresponding partition scanning drive signal according to the first display area, and the partition scanning drive signal controls the corresponding pixel driving unit to reduce the duty cycle of the pixel driving signal, thereby achieving the purpose of reducing the switching duty cycle of the pixels in the corresponding area.

[0098] In some embodiments, the display driving circuit is used to drive a display panel, which may include multiple partitioned refresh areas. The main control circuit 510 in the display driving circuit can provide multiple partitioned scanning drive signals to the pixel driving units in the multiple partitioned refresh areas, thereby adjusting the refresh rate in each partitioned refresh area to realize the partitioned refresh function of the display panel.

[0099] An embodiment of the present application further provides a display panel, which includes a display driving circuit as described in any one of the above embodiments.

[0100] In this embodiment, the display panel includes a display panel and a display driving circuit. The display panel includes a plurality of display pixels, each display pixel includes at least one display pixel, and the display pixel can emit a corresponding color when it is lit. For example, the display pixel can emit one of red light, blue light or green light, and the display pixels of three colors can constitute a display pixel. In the display panel, the pulse width of the first partition scanning driving signal corresponding to the second display area and the pulse width of the second partition scanning driving signal corresponding to the first display area are set according to the second display area and the first display area, so that the pulse width of the second partition scanning driving signal is greater than the pulse width of the first partition scanning driving signal, and the positive bias stability test time of the transistor in the pixel driving unit in the first display area is increased to reduce the difference in the stress test of the transistor in the first display area and the second display area, that is, to compensate for the problem of positive bias of the threshold voltage of the transistor in the high-frequency area after a long-term reliability test, so as to achieve the purpose of solving the problem of dark display in the high refresh area.

[0101] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0102] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0104] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0105] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A display driving method, characterized in that: The display driving method comprises: Determine a first display area and a second display area of ​​a display panel; wherein a refresh frequency of the first display area is less than a refresh frequency of the second display area; According to the first display area and the second display area, setting a pulse width of a first subarea scanning driving signal corresponding to the second display area and a pulse width of a second subarea scanning driving signal corresponding to the first display area; wherein the pulse width of the second subarea scanning driving signal is greater than the pulse width of the first subarea scanning driving signal; The pixel driving unit in the first display area is controlled to generate a corresponding pixel driving signal according to the second partition scanning driving signal and the data signal, so as to drive the display pixels in the first display area to light up at a preset refresh frequency.

2. The display driving method according to claim 1, characterized in that: The display driving method further includes: Obtaining a reliability test time of the display panel; The pulse widths of the first sub-area scanning driving signal and the second sub-area scanning driving signal are determined according to the reliability test time.

3. The display driving method according to claim 2, characterized in that: The reliability test time is positively correlated with the pulse width of the second partition scanning driving signal.

4. The display driving method according to claim 1, characterized in that: The display driving method further includes: According to the time from when the display panel is first lit to when it is currently used, determining a corresponding target pulse width from a preset time-pulse-width relationship table; The pulse width of the second partition scanning driving signal is set to a target pulse width.

5. The display driving method according to claim 4, characterized in that: The time from when the display panel is first lit to when it is currently used is positively correlated with the target pulse width.

6. The display driving method according to any one of claims 1 to 5, characterized in that: The display driving method further includes: Obtaining an absolute value of a difference between image refresh rates of the first display area and the second display area; The pulse width of the second subarea scanning driving signal is determined according to the absolute value of the difference in the picture refresh rates.

7. The display driving method according to claim 6, characterized in that: The difference in the picture refresh rate is positively correlated with the pulse width of the second subarea scanning driving signal.

8. A display driving circuit, characterized in that: The display driving circuit comprises a plurality of pixel driving units and a main control circuit, and the main control circuit is used to execute the display driving method according to any one of claims 1 to 7; The plurality of pixel driving units are used to respectively drive the plurality of display pixels to light up.

9. The display driving circuit according to claim 8, characterized in that: The display driving circuit further comprises a plurality of scanning driving modules, and a plurality of gate scanning lines are respectively connected to the plurality of scanning driving modules; The scanning driving module is controlled by the main control circuit to provide gate scanning driving signals for the plurality of gate scanning lines, and the plurality of pixel driving units are respectively connected to corresponding gate scanning lines; Each of the pixel driving units is used to drive the corresponding display pixel to light up according to the received gate scanning driving signal, partition scanning driving signal and data signal.

10. A display panel, characterized in that: The display panel comprises the display driving circuit as claimed in claim 8 or 9.

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