Pixel driving circuit, pixel driving method, array substrate, and display device

Abstract

The present disclosure provides a pixel driving circuit, a pixel driving method, an array substrate, and a display device. The pixel driving circuit includes: a refresh control module configured to determine, during a data writing stage, to reserve input data corresponding to a previous frame image for the driving module; a current adjustment module configured to stop working when the refresh control module determines to reserve the input data corresponding to the previous frame image for the driving module; a current control module configured to maintain the input data of the driving module; and a driving module configured to input a current driving signal matching the input data to a to-be-driven element during a light emitting stage, so that the to-be-driven element emits light. In this embodiment, when the current frame image is the same as the previous frame image, there is no need to write the input data corresponding to the current frame image for the driving module, thereby meeting the display requirements.

Description

Technical Field

[0001] The present disclosure relates to the field of displays, and in particular, to a pixel driving circuit, a pixel driving method, an array substrate, and a display device. Background Art

[0002] An OLED (Organic Light-Emitting Diode) device belongs to a current-type organic light-emitting device, and is a phenomenon of emitting light through the injection and recombination of carriers. The light-emitting intensity is proportional to the injected current. Under the action of an electric field in the OLED, holes generated by the anode and electrons generated by the cathode will move, and are respectively injected into the hole transport layer and the electron transport layer, and migrate to the light-emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, which excite the light-emitting molecules and finally generate visible light.

[0003] With the increase in the refresh frequency of OLED devices, the power consumption of OLED devices also increases. Therefore, a solution is needed to reduce the power consumption of OLED devices. Summary of the Invention

[0004] The present disclosure provides a pixel driving circuit, a pixel driving method, an array substrate, and a display device to solve the above technical problems.

[0005] According to a first aspect of the present disclosure, there is provided a pixel driving circuit configured to provide a current driving signal to a to-be-driven element. The pixel driving circuit includes: a current control module, a current adjustment module, a refresh control module, and a driving module; the refresh control module is electrically connected to the current control module, the current adjustment module, and the driving module respectively; the current adjustment module is electrically connected to the driving module; the current control module is electrically connected to a power supply;

[0006] The refresh control module is configured to determine to reserve the input data corresponding to the previous frame of image for the driving module during the data writing stage;

[0007] The current adjustment module is configured to stop working when the refresh control module determines to reserve the input data corresponding to the previous frame of image for the driving module;

[0008] The current control module is configured to maintain the input data of the driving module;

[0009] The driving module is configured to input a current driving signal matching the input data to the to-be-driven element during the light-emitting stage, so that the to-be-driven element emits light.

[0010] Optionally, the refresh control module is further configured to write the input data corresponding to the current frame of image to the driving module during the data writing stage;

[0011] The current adjustment module is used to generate input data corresponding to the current frame image during the data writing phase.

[0012] Optionally, the refresh control modules of each sub-pixel in the same pixel are electrically connected to the same control line.

[0013] Optionally, the control line and the input data line of the pixel driving circuit adopt the same wiring path.

[0014] Optionally, the refresh control module includes a first switching device; a first end of the first switching device is electrically connected to the current control module and the driving module respectively; a second end of the first switching device is electrically connected to the current adjustment module; a control end of the first switching device is electrically connected to the corresponding control line;

[0015] The first switching device is used to turn on the current adjustment module, the current control module and the driving module when the control line is at a high level, so that the input data corresponding to the current frame image at the current adjustment module is written into the current control module and the driving module;

[0016] The first switching device is used to disconnect the current adjustment module and the driving module when the control line is at a low level, so that the current control module retains the input data corresponding to the previous frame image for the driving module.

[0017] Optionally, the circuit further includes a first reset module, a first end of the first reset module is electrically connected to the refresh control module and the current adjustment module respectively; a second end of the first reset module is electrically connected to the initial level line; a control end of the first reset module is electrically connected to the reset signal line;

[0018] The first reset module is used to turn on the initial level line, the refresh control module and the current adjustment module when the reset signal line is at a high level.

[0019] Optionally, the circuit further includes a first light emission control module and a second light emission control module;

[0020] A first end of the first light emission control module is electrically connected to a power supply, a second end of the first light emission control module is electrically connected to the driving module, and a control end of the first light emission control module is electrically connected to the light emission control line; the first light emission control module is used to turn on the power supply and the driving module when the light emission control line is at a low level;

[0021] The first end of the second light-emitting control module is electrically connected to the driving module, the second end of the second light-emitting control module is electrically connected to the element to be driven, and the control end of the second light-emitting control module is electrically connected to the light-emitting control line; the second light-emitting control module is configured to turn on the driving module and the element to be driven when the light-emitting control line is at a low level.

[0022] Optionally, the circuit further includes a data writing module; the first end of the data writing module is electrically connected to the first light-emitting control module and the driving module respectively, the second end of the data writing module is electrically connected to the input data line, and the control end of the data writing module is electrically connected to the current row control line;

[0023] The data writing module is configured to turn on the input data line and the driving module when the current row control line is at a low level, so as to write the input data corresponding to the current frame image into the driving module through the input data line.

[0024] Optionally, the circuit further includes a third reset module;

[0025] The first end of the third reset module is electrically connected to the second light-emitting control module and the element to be driven respectively, the second end of the third reset module is electrically connected to the initial level line, and the control end of the third reset module is electrically connected to the reset signal line; the third reset module is configured to turn on the initial level line, the second light-emitting control module and the element to be driven when the reset signal line is at a low level.

[0026] Optionally, the circuit further includes a fourth reset module;

[0027] The first end of the fourth reset module is electrically connected to the first light-emitting control module and the driving module respectively, the second end of the fourth reset module is electrically connected to the initial level line, and the control end of the fourth reset module is electrically connected to the reset signal line; the fourth reset module is configured to turn on the initial level line, the first light-emitting control module and the driving module when the reset signal line is at a low level.

[0028] According to a second aspect of the present disclosure, there is provided a pixel driving method, the method including:

[0029] Comparing a current frame image with a previous frame image to determine first-type pixels and second-type pixels of the current frame image; the first-type pixels refer to pixels for which the input data needs to be refreshed to the current frame image, and the second-type pixels refer to pixels for which the input data of the previous frame image needs to be maintained;

[0030] Determine to generate a refresh control signal for each type of pixel to retain the input data corresponding to the previous frame image for the pixel or write the input data corresponding to the current frame image during the data writing stage.

[0031] Optionally, determining to generate a refresh control signal for each type of pixel includes:

[0032] Obtain the current scan line;

[0033] When the current scan line includes at least one second type of pixel, scan each column of pixels;

[0034] When the next column of pixels is a second type of pixel, determine to generate a refresh control signal for the pixel.

[0035] Optionally, the refresh control module is further configured to:

[0036] When determining to generate a refresh control signal for the pixel, count once;

[0037] When the count value of the pixel exceeds a preset count threshold, adjust the pixel to a first type of pixel to write the input data corresponding to the current frame image for the pixel.

[0038] According to a third aspect of the present disclosure, there is provided an array substrate, including a silicon substrate, a pixel driving circuit as described in the first aspect, and its corresponding element to be driven.

[0039] According to a fourth aspect of the present disclosure, there is provided a display device, including the above-mentioned array substrate, a refresh control module, and a data driving module;

[0040] Each pixel is electrically connected to the data driving module through an input data line; each pixel is electrically connected to the refresh control module through a control line; the refresh control module executes the pixel driving method as described above.

[0041] Optionally, the control line and the input data line adopt the same wiring path.

[0042] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0043] In this embodiment, the pixel driving circuit includes a current control module, a current adjustment module, a refresh control module, and a driving module; the refresh control module is electrically connected to the current control module, the current adjustment module, and the driving module respectively; the current adjustment module is electrically connected to the driving module; the current control module is electrically connected to a power supply; the refresh control module is configured to determine to reserve the input data corresponding to the previous frame of image for the driving module during the data writing stage; the current adjustment module is configured to stop working when the refresh control module determines to reserve the input data corresponding to the previous frame of image for the driving module; the current control module is configured to maintain the input data of the driving module; the driving module is configured to input a current driving signal matching the input data to the element to be driven during the light emitting stage, so that the element to be driven emits light. In this way, in this embodiment, by setting the refresh control module, it can be determined to reserve the input data corresponding to the previous frame of image for the driving module when the current frame of image is the same as the previous frame of image, without writing the input data corresponding to the current frame of image for the driving module, thereby meeting the display requirements. In addition, the data driving module that provides the input data of the pixel driving circuit can not work or output a preset level when there is no need to write the input data corresponding to the current frame of image, which can reduce the power consumption of the display device.

[0044] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Description of the Drawings

[0045] Figure 1 Schematic diagram of a pixel matrix according to an embodiment of the present disclosure.

[0046] Figure 2 Schematic diagram of a pixel driving circuit according to an embodiment of the present disclosure.

[0047] Figure 3 Schematic diagram of another pixel driving circuit according to an embodiment of the present disclosure.

[0048] Figure 4 Schematic diagram of yet another pixel driving circuit according to an embodiment of the present disclosure.

[0049] Figure 5 Schematic diagram of yet another pixel driving circuit according to an embodiment of the present disclosure.

[0050] Figure 6 Schematic diagram of yet another pixel driving circuit according to an embodiment of the present disclosure.

[0051] Figure 7 Schematic diagram of a pixel driving circuit improved on the basis of an 8T1C according to an embodiment of the present disclosure.

[0052] Figure 8Schematic diagram of a pixel driving circuit improved based on another 8T1C according to an embodiment of the present disclosure.

[0053] Figure 9 Schematic diagram of a pixel driving circuit improved based on a 7T1C according to an embodiment of the present disclosure.

[0054] Figure 10 Schematic diagram of a working timing according to an embodiment of the present disclosure.

[0055] Figure 11 Schematic diagram of an equivalent circuit of the pixel driving circuit in the initialization stage according to an embodiment of the present disclosure.

[0056] Figure 12 Schematic diagram of an equivalent circuit of the pixel driving circuit in the data writing stage according to an embodiment of the present disclosure.

[0057] Figure 13 Schematic diagram of an equivalent circuit of the pixel driving circuit in the light emitting stage according to an embodiment of the present disclosure.

[0058] Figure 14 Flowchart of a pixel driving method according to an embodiment of the present disclosure.

[0059] Figure 15 Flowchart of a method for obtaining a refresh control signal according to an embodiment of the present disclosure.

[0060] Figure 16 Flowchart of a method for obtaining a pixel driving method according to an embodiment of the present disclosure.

[0061] Figure 17 Schematic diagram of a distribution path of a control line according to an embodiment of the present disclosure. Detailed implementation manners

[0062] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0063] The present disclosure provides a display device, which may include, but is not limited to, devices with display functions such as mobile phones, computers, tablets, e-books, watches, three-dimensional display screens, conference all-in-ones, electronic whiteboards, etc.

[0064] See Figure 1 , the display device 2 includes a plurality of pixels 1, and the plurality of pixels 1 are uniformly arranged in the row and column directions. It can be understood that Figure 1Only 9 pixels 1 in 3 rows and 3 columns are exemplified, and no other pixels 1 are exemplified, so as to keep the drawings simple and clear, but it does not affect the understanding of the technical solution of the present disclosure.

[0065] See Figure 1 and Figure 2 , the display device 2 drives the light-emitting elements of each pixel 1, that is, Figure 2 the to-be-driven element 20 shown in the figure emits light to display an image. Among them, the to-be-driven element 20 is a current-driven light-emitting diode, for example: a micro light-emitting diode or a mini light-emitting diode (mini LED) or an organic light-emitting diode OLED. The pixel 1 further includes a pixel driving circuit 10, the pixel driving circuit 10 is connected to the to-be-driven element 20, and the pixel driving circuit 10 is configured to provide a current driving signal to the to-be-driven element 20 to control the current flowing through the to-be-driven element 20 and the working duration of the to-be-driven element 20 when displaying each frame of image, thereby controlling its light emission.

[0066] See Figure 2 , the pixel driving circuit 10 includes a current control module 100, a current adjustment module 300, a refresh control module 400, and a driving module 200. Among them, the refresh control module 400 is electrically connected to the current control module 100, the current adjustment module 300, and the driving module 200 respectively; the current adjustment module 300 is electrically connected to the driving module 200; the current control module 100 is electrically connected to the power supply.

[0067] The refresh control module 400 is used to determine to reserve the input data corresponding to the previous frame of image for the driving module 200 during the data writing stage when the current frame of image is the same as the previous frame of image.

[0068] The current adjustment module 300 is used to stop working when the refresh control module 400 determines to reserve the input data corresponding to the previous frame of image for the driving module 200;

[0069] The current control module 100 is used to maintain the input data of the driving module 200;

[0070] The driving module 200 is used to input a current driving signal matching the input data to the to-be-driven element during the light-emitting stage, so that the to-be-driven element emits light.

[0071] In this embodiment, by setting the refresh control module, it can be determined to reserve the input data corresponding to the previous frame of image for the driving module when the current frame of image is the same as the previous frame of image, and there is no need to write the input data corresponding to the current frame of image for the driving module, so as to meet the display requirements. In addition, the data driving module that provides input data by the pixel driving circuit can not work or output a preset level when there is no need to write the input data corresponding to the current frame of image, which can reduce the power consumption of the display device.

[0072] In this embodiment, the refresh control module 400 writes the input data corresponding to the current frame image to the driving module during the data writing stage. At this time, the current adjustment module is used to generate the input data corresponding to the current frame image during the data writing stage. In this embodiment, by setting the refresh control module to determine the input data corresponding to the current frame to be written to the driving module, the requirement of displaying different contents is satisfied.

[0073] In this embodiment, the current control module includes an integrating capacitor Cst. The first end of the integrating capacitor Cst is connected to the power supply VDD, and the second end of the integrating capacitor Cst is electrically connected to the refresh control module 400 and the driving module 200 respectively. This integrating capacitor Cst can hold the input data at node N1, that is, the input data of the driving module 200, so that the driving module 200 outputs a stable current driving signal.

[0074] In this embodiment, the refresh control module includes a first switching device T1. The first end of the first switching device T1 is electrically connected to the current control module 100 and the driving module 200 respectively, that is, connected to node N1. The second end of the first switching device T1 is electrically connected to the current adjustment module 300; the control end of the first switching device T1 is electrically connected to the corresponding control line Data_En. Among them, the above control line Data_En is electrically connected to a refresh control module (not shown in the figure) in a subsequent embodiment to receive a high-level or low-level signal, so as to achieve the effect of turning on or off the first switching device T1, and the power consumption of the first switching device T1 is relatively low.

[0075] The first switching device T1 is used to conduct the current adjustment module 300, the current control module 100, and the driving module 200 when the control line Data_En is at a high level (such as +6V), so that the input data corresponding to the current frame image at the current adjustment module 300 is written to the current control module 100 and the driven module 200, that is, the input data can be written to node N1.

[0076] The first switching device T1 is used to disconnect the current adjustment module 300 and the driving module 200 when the control line Data_En is at a low level (such as -6V), that is, to make the current adjustment module 300 no longer electrically connected to node N1, so that the current control module 100 retains the input data corresponding to the previous frame image for the driving module 200, that is, the input data cannot be written to node N1 at this time.

[0077] In this embodiment, the current adjustment module 300 includes a third switching device T3. The first end of the third switching device T3 is electrically connected to the refresh control module 400, the second end of the third switching device T3 is electrically connected to the second end of the driving module, and the control end of the third switching device T3 is electrically connected to the current row control line Gate. When the current row control line Gate is at a high level, the third switching device T3 conducts between the second end of the refresh control module 400 and the second end of the driving module 200, so as to write the input data of the driving module 200 into the control end of the driving module 200.

[0078] In this embodiment, the driving module 200 includes a fourth switching device T4. The first end of the fourth switching device T4 is electrically connected to the subsequent first light-emitting control module 600 and the data writing module 500, the second end of the fourth switching device T4 is electrically connected to the current adjustment module 300, and the control end of the fourth switching device T4 is electrically connected to the current control module 100 and the refresh control module 400 respectively. The fourth switching device T4 can output a current driving signal that matches according to the level (the sum of the input data and the compensation data) at its control end, i.e., at node N1.

[0079] In this embodiment, the pixel driving circuit 10 further includes a first light-emitting control module and a second light-emitting control module. Refer to Figure 3 , the first end of the first light-emitting control module 600 is electrically connected to the power supply VDD, the second end of the first light-emitting control module 600 is connected to the driving module 200, and the control end of the first light-emitting control module 600 is electrically connected to the light-emitting control line EM; the first light-emitting control module 600 is used to conduct between the power supply VDD and the driving module 200 when the light-emitting control line is at a low level.

[0080] The first end of the second light-emitting control module 700 is electrically connected to the driving module 200, the second end of the second light-emitting control module 700 is electrically connected to the element to be driven 20, and the control end of the second light-emitting control module 700 is electrically connected to the light-emitting control line; the second light-emitting control module 700 is used to conduct between the driving module 200 and the element to be driven when the light-emitting control line is at a low level.

[0081] In one example, the first light-emitting control module 600 includes a sixth switching device T6. The first end of the sixth switching device T6 is electrically connected to the first end of the first light-emitting control module 600, the second end of the sixth switching device T6 is connected to the driving module 200, and the control end of the sixth switching device T6 is electrically connected to the control end of the first light-emitting control module 600; the sixth switching device T6 is used to conduct the power supply VDD and the driving module 200 when the light-emitting control line is at a low level. In this way, in this embodiment, when the first light-emitting control module 600, the driving module 200, and the second light-emitting control module 700 are all turned on, the current driving signal output by the driving module 200 can control the element 20 to be driven to emit light, and the light-emitting brightness of the element 20 to be driven is associated with the above-mentioned current driving signal.

[0082] In one example, the second light-emitting control module 700 includes a seventh switching device T7. The first end of the seventh switching device T7 is electrically connected to the driving module 200, the second end of the seventh switching device T7 is electrically connected to the element 20 to be driven, and the control end of the seventh switching device T7 is electrically connected to the light-emitting control line EM; the seventh switching device T7 is used to conduct the driving module 200 and the element to be driven when the light-emitting control line is at a low level.

[0083] In this embodiment, continue to refer to Figure 3 , the pixel driving circuit 10 further includes a data writing module 500. The first end of the data writing module 500 is electrically connected to the first light-emitting control module 600 and the driving module 200 respectively, the second end of the data writing module 500 is electrically connected to the input data line Data, and the control end of the data writing module 500 is electrically connected to the current row control line Gate. The data writing module 500 is used to conduct the input data line Data and the driving module 200 when the current row control line Gate is at a low level, so as to write the input data corresponding to the current frame image into the driving module 200 through the input data line Data. In this way, in this embodiment, when the data writing module 500, the driving module 200, the current adjustment module 300, and the refresh control module 400 are all turned on, the voltage value on the input data line can be used as the input data and written to the control end of the driving module 200, that is, written to the node N1.

[0084] In one example, the data writing module 500 includes a fifth switching device T5. The first end of the fifth switching device T5 is electrically connected to the first light-emitting control module 600 and the driving module 200 respectively, the second end of the fifth switching device T5 is electrically connected to the input data line Data, and the control end of the fifth switching device T5 is electrically connected to the current row control line Gate. The fifth switching device T5 is used to conduct the input data line Data and the driving module 200 when the current row control line Gate is at a low level, so as to write the input data corresponding to the current frame image into the driving module 200 through the input data line Data.

[0085] In this embodiment, continue to refer to Figure 3 , the pixel driving circuit 10 further includes a third reset module 800. The first end of the third reset module 800 is electrically connected to the second light-emitting control module 700 and the element to be driven 20 respectively. The second end of the third reset module 800 is electrically connected to the initial level line Vinit. The control end of the third reset module 800 is electrically connected to the reset signal line (RST3); the third reset module is used to conduct the initial level line Vinit, the second light-emitting control module 700 and the element to be driven when the reset signal line (RST3) is at a low level, so that the anode of the element to be driven 20 and the second end of the second light-emitting control module 700 are disposed at the initial level.

[0086] In an example, the third reset module 800 includes an eighth switching device T8. The first end of the eighth switching device T8 is electrically connected to the second light-emitting control module 700 and the element to be driven 20 respectively. The second end of the eighth switching device T8 is electrically connected to the initial level line Vinit. The control end of the eighth switching device T8 is electrically connected to the reset signal line (RST3); the eighth switching device T8 is used to conduct the initial level line Vinit, the second light-emitting control module 700 and the element to be driven when the reset signal line (RST3) is at a low level, so that the anode of the element to be driven 20 and the second end of the second light-emitting control module 700 are disposed at the initial level.

[0087] Considering that the pixel driving circuit can be implemented by an 8T2C (T is a TFT, i.e., a thin-film transistor; C is a capacitor) circuit or a 7T2C circuit, subsequent embodiments will be analyzed according to different pixel driving circuits.

[0088] In an 8T2C circuit, refer to Figure 4 , the pixel driving circuit includes a first reset module 900. The first end of the first reset module 900 is electrically connected to the refresh control module 400 and the current adjustment module 300 respectively; the second end of the first reset module 900 is electrically connected to the initial level line (the level thereon is Vinit); the control end of the first reset module 900 is electrically connected to the reset signal line Rst. The first reset module 900 is used to conduct the initial level line Vinit, the refresh control module 400 and the current adjustment module 300 when the reset signal line Rst is at a high level. Thus, in this example, when the first reset module 900 is conducting, the second end of the refresh control module 400 and the first end of the current adjustment module 300 can be disposed at the initialization level. Thus, in this example, when the first reset module 900 is conducting, the second end of the refresh control module 400 and the first end of the current adjustment module 300 can be disposed at the initialization level

[0089] In a 7T2C circuit, the pixel driving circuit of the 7T2C also includes a first reset module 900, and reference may continue to be made to Figure 4 the circuit shown, which will not be elaborated here.

[0090] In another 8T2C circuit, refer to Figure 5 , the pixel driving circuit includes a first reset module 1000. The first end of the first reset module 900 is electrically connected to the second light-emitting control module 700, the driving module 200, and the current adjustment module 300 respectively. The second end of the first reset module 1000 is electrically connected to the initial level line (the level thereon is Vinit); the control end of the first reset module 1000 is electrically connected to the reset signal line Rst. The first reset module 1000 is used to conduct the initial level line Vinit, the second light-emitting control module 700, the driving module 200, and the current adjustment module 300 when the reset signal line Rst is at a high level. Thus, in this example, when the first reset module 1000 is conducting, the first end of the second light-emitting control module 700, the second end of the driving module 200, and the second end of the current adjustment module 300 can be set to the initialization level.

[0091] In one example, the first reset module 1000 includes a second switching device T2. The first end of the second switching device T2 is electrically connected to the second light-emitting control module 700, the driving module 200, and the current adjustment module 300 respectively. The second end of the second switching device T2 is electrically connected to the initial level line (the level thereon is Vinit). The control end of the second switching device T2 is electrically connected to the reset signal line Rst. The second switching device T2 is used to conduct the initial level line Vinit, the second light-emitting control module 700, the driving module 200, and the current adjustment module 300 when the reset signal line Rst is at a high level. Thus, in this example, when the second switching device T2 is conducting, the first end of the second switching device T2, the second end of the driving module 200, and the second end of the current adjustment module 300 can be set to the initialization level.

[0092] In an 8T2C circuit, refer to Figure 6 , the pixel driving circuit includes a fourth reset module. The first end of the fourth reset module is electrically connected to the first light-emitting control module and the driving module respectively, the second end of the fourth reset module is electrically connected to the initial level line, and the control end of the fourth reset module is electrically connected to the reset signal line Rst2; the fourth reset module is used to conduct the initial level line Vinit, the first light-emitting control module, and the driving module when the reset signal line Rst2 is at a low level. Thus, when the fourth reset module is conducting, the initial level line, the first light-emitting control module, and the driving module can be electrically connected, that is, the second end of the first light-emitting control module and the first end of the driving module can be set to the initial level.

[0093] In one example, the fourth reset module includes a ninth switching device T9. The first end of the ninth switching device T9 is electrically connected to the first light-emitting control module and the driving module respectively. The second end of the ninth switching device T9 is electrically connected to the initial level line. The control end of the ninth switching device T9 is electrically connected to the reset signal line Rst2. The ninth switching device T9 is configured to conduct the initial level line Vinit, the first light-emitting control module, and the driving module when the reset signal line Rst2 is at a low level. In this way, when the ninth switching device T9 is conducting, the initial level line, the first light-emitting control module, and the driving module can be electrically connected, that is, the second end of the first light-emitting control module and the first end of the driving module are set to the initial level.

[0094] Based on the above Figures 1 - 7 block diagram of the pixel driving circuit, three different circuit diagrams can be obtained in the embodiments of the present disclosure, as shown in Figure 7 , Figure 8 and Figure 9 respectively. Figure 7 Illustrates a pixel driving circuit obtained by improving on the basis of an 8T1C circuit. Refer to Figure 7 , Figure 8 illustrates another pixel driving circuit obtained by improving on the basis of an 8T1C circuit. Figure 9 Illustrates a pixel driving circuit obtained by improving on the basis of a 7T1C circuit.

[0095] Considering that the working processes of the above three pixel driving circuits are similar, the following takes the Figure 9 described pixel driving circuit and the Figure 10 shown working timing as an example to describe its working principle, including:

[0096] Phase 1, initialization phase

[0097] Refer to Figure 9 , Figure 10 and Figure 11 , in the initialization phase, when scanning the nth row of pixels, the emission control line EM is at a high level, i.e., EM(n) is at a high level, Rst(n) is at a low level (such as Rst1 in Figure 11 ), Rst(n + 1) is at a high level (such as Rst2 in Figure 11 ) and the current row control line Gate(n) is at a high level. At this time, the first switching device T1, the second switching device T2, and the fourth switching device are conducting, and the node N1 can be reset.

[0098] Phase 2, data writing phase.

[0099] Refer to Figure 9 , Figure 10 andFigure 12 , in the data writing stage, when scanning the nth row of pixels, the emission control line EM is at a high level, that is, EM(n) is at a high level, Rst(n) is at a high level (such as Rst1 in Figure 12 ), Rst(n + 1) is at a low level (such as Rst2 in Figure 12 ), and the current row control line Gate(n) is at a low level. At this time, the third switching device T3, the fourth switching device T4, and the fifth switching device T5 are turned on, and the level on the input data line is the input data Vdata corresponding to the current frame image. At this time, it can reach the first end of the third switching device T3 through the fifth switching device T5, the fourth switching device T4, and the third switching device T3.

[0100] When the current frame image is the same as the previous frame image, the current drive signal output by the fourth switching device T4 is the same, that is, there is no need to write the input data. At this time, the control signal Data_En of the first switching device T1 can be at a low level, that is, the first switching device T1 is in an off state, and there is no electrical connection between the first end of the third switching device T3 and the node N1, and the input data corresponding to the current frame image cannot be written to the node N1.

[0101] It should be noted that when there is no need to write the input data, the level of the input data line can be a specified level (such as 0V). At this time, the operational amplifier in the data driving module can not work, thereby reducing the power consumption. Or rather, the data driving module does not work during the second stage of the current frame image, which is beneficial to reducing the power.

[0102] When the current frame image is different from the previous frame image, the current drive signal output by the fourth switching device T4 is different from the current drive signal corresponding to the previous frame image, that is, it is necessary to write the input data. At this time, the control signal Data_En of the first switching device T1 can be at a high level, that is, the first switching device T1 is in an on state, and the first end of the third switching device T3 is electrically connected to the node N1, and the input data corresponding to the current frame image can be written to the node N1.

[0103] Stage three, emission stage

[0104] Refer to Figure 9 、 Figure 10 and Figure 13 , in the emission stage, when scanning the nth row of pixels, the emission control line EM is at a low level, that is, EM(n) is at a low level, and both Rst(n) and Rst(n + 1) are at a high level (such as Figure 13Rst1 and Rst2 therein, and the current row control line Gate(n) is at a high level. At this time, the fourth switching device T4, the sixth switching device T6, and the seventh switching device T7 are turned on. At this time, a circuit path is formed from the power supply VDD, the sixth switching device T6, the fourth switching device T4, and the seventh switching device T7 to the ground VSS1. At this time, the fourth switching device T4 can output a current driving signal to drive the device D to be driven to emit light.

[0105] Considering that the first switching device T1 requires a control signal Data_En during the data writing stage, therefore, this embodiment further provides a pixel driving method, which can be applied to a display device. Refer to Figure 14 , including step 141 to step 142.

[0106] In step 141, compare the current frame image and the previous frame image to determine the first type of pixels and the second type of pixels in the current frame image; the first type of pixels refers to the pixels of the input data that need to be refreshed to the current frame image, and the second type of pixels refers to the pixels of the input data that need to maintain the previous frame image.

[0107] In this embodiment, the display device includes a refresh control module, which can be a processor or a microprocessor in the display device, and is not limited herein. The refresh control module can obtain the current frame image, and then compare the current frame image and the previous frame image, that is, compare the pixel values of each pixel in the two frame images;

[0108] When the pixel values of the pixels in the two frame images are different, the refresh control module can set the pixel as the first type of pixels, that is, the first type of pixels refers to the pixels of the input data that need to be refreshed to the current frame image. When the pixel values of the pixels in the two frame images are the same, the refresh control module can set the pixel as the second type of pixels, that is, the second type of pixels refers to the pixels of the input data that need to maintain the previous frame image.

[0109] In step 142, determine the refresh control signals generated for each type of pixel to retain the input data corresponding to the previous frame image or write the input data corresponding to the current frame image for the pixel during the data writing stage.

[0110] In this embodiment, the refresh control module can determine the refresh control signals generated for each type of pixel to retain the input data corresponding to the previous frame image or write the input data corresponding to the current frame image for the pixel during the data writing stage.

[0111] Refer to Figure 15 , the refresh control module determines the refresh control signals generated for each type of pixel, including step 151 to step 153.

[0112] In step 151, obtain the current scan line.

[0113] In this step, the display device scans the display image in row order. When scanning the current scan line, the refresh control module can obtain the line number of the current scan line, which is the ordinate of the pixels in the current scan line.

[0114] In step 152, when the current scan line includes at least one second type of pixel, scan each column of pixels.

[0115] In this step, after obtaining the first type of pixel and the second type of pixel, the refresh control module can obtain the second type of pixel in each row. Or rather, the second type of pixel in each row has the same ordinate. In this way, the refresh control module can form a set of line numbers, or a set of ordinates, with the line numbers of the rows containing the second type of pixel.

[0116] In this step, the refresh control module can determine whether the line number of the current scan line is within the above set of line numbers, or rather determine whether the current scan line includes the second type of pixel. When the line number of the current scan line is within the above set of ordinates, the refresh control module can determine that the current scan line includes at least one second pixel, and at this time, each column of pixels can be scanned.

[0117] In step 153, when the next column of pixels is the second type of pixel, determine to generate a refresh control signal for this pixel.

[0118] In this step, the refresh control module can scan each column of pixels in sequence from left to right. Considering that only one row of pixels is in the on state at that moment, then when scanning each column of pixels, only the pixel where the row and column intersect is in the display state. Or rather, the refresh control module can determine the abscissa and ordinate of the pixel according to the row and column where the pixel is located. At this time, the refresh control module can determine whether the next column of pixels belongs to the first type of pixel or the second type of pixel.

[0119] When the next column of pixels belongs to the first type of pixel, the refresh control module can determine to generate a refresh control signal for this pixel. That is to say, during the data writing stage of each pixel, the first switching device T1 is in the on state, so that the third switching device T3 writes the input data to the node N1, achieving the effect of adjusting the current driving signal output by the fourth switching device T4.

[0120] When the next column of pixels belongs to the second type of pixel, the refresh control module can determine to generate a refresh control signal for this pixel. That is to say, during the data writing stage of each pixel, the first switching device T1 is in the off state. At this time, the data driving module can stop working, thereby reducing the power consumption of the data driving module. Or rather, the third switching device T3 cannot write the input data to the node N1, so that the fourth switching device T4 outputs the current driving signal corresponding to the previous frame of image.

[0121] Considering that the integrating capacitor Cst holds charges for a certain period of time, in this embodiment, the display device can store a pre-designed counting threshold. For example, the value range of the pre-designed counting threshold is 2 to 10, and in one example, the pre-designed counting threshold is 5. The refresh control module is further configured to count once when determining to generate a refresh control signal for a pixel. When the count value of the pixel exceeds the pre-designed counting threshold, the pixel is adjusted to the first type of pixel, so as to write the input data corresponding to the current frame image for the pixel. That is to say, the refresh control module rewrites the data for the pixels that continuously use the input data corresponding to the previous frame image, avoiding the problem of excessive attenuation of brightness and chrominance caused by not refreshing the input data for a long time, so as to ensure the display effect.

[0122] The following describes the process of the above pixel driving method in conjunction with an embodiment. Refer to Figure 16 , including:

[0123] (1) The refresh control module obtains the current frame image, and compares the pixel values of the current frame image (current Frame) and the previous frame image (previous Frame), obtains the pixels with the same pixel values in the two frame images, and obtains the coordinate data {x, y} of the pixels.

[0124] (2) Start scanning the current frame image, that is, Frame start, first set Data_En = 1, that is, the first switching device T1 is in the conducting state.

[0125] (3) Initialize the variable b, and set b = 0. Then, when scanning a row of pixels, set b = b + 1, that is, the variable b is incremented by 1.

[0126] (4) Determine whether the current value of the variable b satisfies b = V + 1, where V is the total number of rows of pixels. When b = V + 1 is satisfied, it means that the current frame image has been displayed, and return to step (1). When b = V + 1 is not satisfied, that is, b is less than V + 1, it means that the current frame image has not been displayed, and the pixels of each column of the current row of pixels can be scanned.

[0127] (5) Determine whether b is in {y}, that is, whether the row number of the current scanned row is in the set of ordinate values, or whether there are second-type pixels in the current scanned row. When there are no second-type pixels, the image data can be refreshed in the manner of the related art, and return to step (3). When there is at least one second-type pixel in the current scanned row, that is, when b is within {y}, initialize the variable a and set a = 0.

[0128] (6) When scanning a column of pixels, set a = a + 1, that is, the variable a is incremented by 1.

[0129] (7) Determine whether the current value of variable a satisfies a = H + 1, where H is the total number of columns of pixels. When a = H + 1 is satisfied, it indicates that the pixels of this row have been scanned, and return to step (3). When a = H + 1 is not satisfied, that is, a is less than H + 1, it indicates that the pixels of this row have not been scanned, and other column pixels of the current row pixels can be scanned.

[0130] (8) Determine whether the current pixel (a, b) is located in {x, y}, that is, whether the coordinate data of the current pixel is within the coordinate set of the second type of pixels. When it does not exist, return to step (6); when it exists, let Data_En(a, b) = 0. At this time, the first switching device T1 of this pixel is in the off state, that is, Data(a, b) = Data(a, b - 1), and jump to step (6).

[0131] It should be noted that step (8) also sets a counter. When Data_En(a, b) = 0 is set, the counter T = 0, and T = T + 1. See Figure 17 , when T[Data_En(a, b) = 0] exceeds FrameMax (i.e., the pre-designed counting threshold), let Data_En(a, b) = 1, that is, the first switching device T1 is turned on to write the input data corresponding to the current frame image; when T[Data_En(a, b) = 0] is less than FrameMax (i.e., the pre-designed counting threshold), let Data_En(a, b) = 0, that is, the first switching device T1 is turned off to maintain the input data corresponding to the previous frame image.

[0132] The embodiment of the present disclosure also provides an array substrate, including a silicon substrate, the Figures 1 - 13 pixel driving circuit as described above and its corresponding element to be driven. In this embodiment, the array substrate is implemented by using a silicon substrate, which can not only improve the stability of the switching device, but also reduce the area of each switching device in the pixel driving circuit, thereby greatly improving the pixel density per unit (Pixels Per Inch, PPI) of the array substrate.

[0133] The embodiment of the present disclosure also provides a display device, including the above array substrate, a refresh control module and a data driving module. Each pixel is electrically connected to the data driving module through an input data line; each pixel is electrically connected to the refresh control module through a control line; the refresh control module executes the Figures 14 - 16 pixel driving method as described above. In this embodiment, the refresh control modules of each sub-pixel in the same pixel are electrically connected to the same control line, and the control line and the input data line adopt the same wiring path, and the effect is as Figure 17 shown.

[0134] The terms used in this disclosure are for the purpose of describing particular embodiments only and are not intended to limit the disclosure. Unless otherwise defined, the technical terms or scientific terms used in this disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The use of the words "a" or "an" and the like in the specification and claims of this disclosure does not denote a limitation of quantity but rather the presence of at least one. "Plurality" means at least two. The words "comprising" or "including" and the like mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The words "connected" or "coupled" and the like are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "the", and "said" used in the specification and appended claims of this disclosure are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0135] For method embodiments, since they basically correspond to apparatus embodiments, the relevant parts can be referred to the partial descriptions of the apparatus embodiments. The method embodiments and the apparatus embodiments complement each other.

[0136] The above are only the preferred embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this disclosure shall be included within the scope of protection of this disclosure.

Claims

1. A pixel driving circuit configured to provide a current driving signal to an element to be driven, characterized in that, The pixel driving circuit includes: a current control module, a current adjustment module, a refresh control module, and a driving module; the refresh control module is electrically connected to the current control module, the current adjustment module, and the driving module respectively; the current adjustment module is electrically connected to the driving module; the current control module is electrically connected to a power supply; The refresh control module is configured to determine and reserve the input data corresponding to the previous frame of image for the driving module during the data writing stage; The current adjustment module is configured to stop working when the refresh control module determines to reserve the input data corresponding to the previous frame of image for the driving module; The current control module is configured to maintain the input data of the driving module; The driving module is configured to input a current driving signal matching the input data to the element to be driven during the light emitting stage, so that the element to be driven emits light; The refresh control module includes a first switching device; a first end of the first switching device is electrically connected to the current control module and the driving module respectively; a second end of the first switching device is electrically connected to the current adjustment module; a control end of the first switching device is electrically connected to a corresponding control line; The first switching device is configured to turn on the current adjustment module, the current control module, and the driving module when the control line is at a high level, so that the input data corresponding to the current frame of image at the current adjustment module is written into the current control module and the driving module; The first switching device is configured to turn off the current adjustment module and the driving module when the control line is at a low level, so that the current control module reserves the input data corresponding to the previous frame of image for the driving module.

2. The circuit according to claim 1, characterized in that, The refresh control module is further configured to write the input data corresponding to the current frame of image to the driving module during the data writing stage; The current adjustment module is configured to generate the input data corresponding to the current frame of image during the data writing stage.

3. The circuit according to claim 1, characterized in that, The refresh control modules of the sub-pixels in the same pixel are electrically connected to the same control line.

4. The circuit according to claim 3, characterized in that, The control line and the input data line of the pixel driving circuit adopt the same wiring path.

5. The circuit according to claim 1, characterized in that, The circuit further includes a first reset module, a first end of the first reset module is electrically connected to the refresh control module and the current adjustment module respectively; a second end of the first reset module is electrically connected to an initial level line; a control end of the first reset module is electrically connected to a reset signal line; The first reset module is configured to turn on the initial level line, the refresh control module, and the current adjustment module when the reset signal line is at a high level.

6. The circuit according to claim 1, characterized in that, The circuit further includes a first light emitting control module and a second light emitting control module; A first end of the first light emitting control module is electrically connected to a power supply, a second end of the first light emitting control module is connected to the driving module, a control end of the first light emitting control module is electrically connected to a light emitting control line; the first light emitting control module is configured to turn on the power supply and the driving module when the light emitting control line is at a low level; The first end of the second light emission control module is electrically connected to the driving module, the second end of the second light emission control module is electrically connected to the element to be driven, and the control end of the second light emission control module is electrically connected to the light emission control line; the second light emission control module is configured to turn on the driving module and the element to be driven when the light emission control line is at a low level.

7. The circuit according to claim 6, characterized in that, The circuit further includes a data writing module; the first end of the data writing module is electrically connected to the first light emission control module and the driving module respectively, the second end of the data writing module is electrically connected to the input data line, and the control end of the data writing module is electrically connected to the current row control line; The data writing module is configured to turn on the input data line and the driving module when the current row control line is at a low level, so as to write the input data corresponding to the current frame image into the driving module through the input data line.

8. The circuit according to claim 6, characterized in that, The circuit further includes a third reset module; The first end of the third reset module is electrically connected to the second light emission control module and the element to be driven respectively, the second end of the third reset module is electrically connected to the initial level line, and the control end of the third reset module is electrically connected to the reset signal line; the third reset module is configured to turn on the initial level line, the second light emission control module and the element to be driven when the reset signal line is at a low level.

9. The circuit according to claim 8, characterized in that, The circuit further includes a fourth reset module; The first end of the fourth reset module is electrically connected to the first light emission control module and the driving module respectively, the second end of the fourth reset module is electrically connected to the initial level line, and the control end of the fourth reset module is electrically connected to the reset signal line; the fourth reset module is configured to turn on the initial level line, the first light emission control module and the driving module when the reset signal line is at a low level.

10. A pixel driving method, characterized in that, Applicable to a display device, the display device includes the pixel driving circuit and the refresh control module according to any one of claims 1 to 9, and the method includes: Comparing the current frame image with the previous frame image to determine the first type of pixels and the second type of pixels in the current frame image; the first type of pixels refers to the pixels for which the input data of the current frame image needs to be refreshed, and the second type of pixels refers to the pixels for which the input data of the previous frame image needs to be retained. Determining to generate a refresh control signal for each type of pixel to retain the input data corresponding to the previous frame image or write the input data corresponding to the current frame image for the pixel during the data writing stage.

11. The method according to claim 10, characterized in that, Determining to generate a refresh control signal for each type of pixel includes: Obtaining the current scanning row; When the current scanning row includes at least one second type of pixel, scanning each column of pixels; When the next column of pixels is a second type of pixel, determining to generate a refresh control signal for the pixel.

12. The method according to claim 10, wherein, The refresh control module is further configured to: When it is determined to generate a refresh control signal for the pixel, count once; When the count value of the pixel exceeds a preset count threshold, adjust the pixel to the first type of pixel to write the input data corresponding to the current frame image for the pixel.

13. An array substrate, wherein, Including a silicon substrate, the pixel driving circuit according to any one of claims 1 to 9 and its corresponding element to be driven.

14. A display device, wherein, Including the array substrate, refresh control module, and data driving module described in claim 13; Each pixel is electrically connected to the data driving module through an input data line; each pixel is electrically connected to the refresh control module through a control line; the refresh control module executes the pixel driving method described in any one of claims 10 to 12.

15. The display device according to claim 14, wherein, The control line and the input data line adopt the same wiring path.

Images