Display device and pixel pre-charge control method
By setting up a pre-charging circuit and timing controller in the OLED display, and performing zoned pre-charging based on grayscale data, the problem of insufficient charging time is solved, the display effect is improved and the power consumption is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
- Filing Date
- 2026-02-13
- Publication Date
- 2026-05-05
AI Technical Summary
At high refresh rates, OLED displays suffer from insufficient pixel unit charging time, leading to display abnormalities such as uneven brightness and color shift. Furthermore, existing pre-charging methods consume a significant amount of energy.
By setting a pre-charging circuit and timing controller in the display device, the pre-charging area is determined according to the grayscale data of the image to be displayed, and pre-charging is performed before the sub-pixels in the pre-charging area are charged. This partitioned pre-charging method shortens the charging time and reduces power consumption.
The display effect has been improved, the problem of insufficient charging has been solved, and the pre-charging power consumption has been reduced through partitioned pre-charging.
Smart Images
Figure CN121982992A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display device technology, and in particular to a display device and a pixel pre-charging control method. Background Technology
[0002] At higher refresh rates, to ensure proper display of OLED (Organic Light-Emitting Diode Display) screens and avoid display abnormalities such as uneven brightness, ghosting, and color shift, a sufficient charging rate is needed to charge the data lines to the target voltage within a short time. However, to reduce the number of source driver ICs (Integrated Circuit Chips), displays often employ a MUX3 driving architecture, where the data lines of three sub-pixels share the same data voltage. This further reduces the charging time of each pixel unit at the same refresh rate, leading to insufficient charging of the pixel units.
[0003] In related technologies, pre-charging of pixel units can be achieved by setting up a pre-charging circuit to shorten the charging time required for each pixel unit. However, the relevant pre-charging method pre-charges all pixel units of the entire OLED display, which has the problem of high pre-charging power consumption. Summary of the Invention
[0004] This application provides a display panel to at least partially solve the above-mentioned technical problems.
[0005] To achieve the above objectives, in a first aspect, a display device is provided, comprising:
[0006] The display area includes multiple pixel units arranged in an array, and each pixel unit includes three sub-pixels arranged horizontally. If the charging path is interfered with, each pre-charging path is connected to multiple sub-pixels; The timing controller, connected to the pre-charge circuit, is configured as follows: Based on the grayscale data of the image to be displayed, a pre-charge area is determined from the display area, and a pre-charge control signal is output to control the pre-charge circuit corresponding to the pre-charge area, so as to pre-charge the sub-pixels before charging the sub-pixels in the pre-charge area.
[0007] Optionally, the display area includes several preset partitions, each pre-charging circuit is connected to each sub-pixel in a preset partition, and the pre-charging circuit includes several first switching devices; The first switching device includes a first terminal connected to a row of sub-pixels, a second terminal connected to a pre-charge voltage, and a control terminal connected to a pre-charge control signal.
[0008] Optionally, it may also include several stages of transmission circuits; The cascading circuit is connected to a timing controller and a pre-charge circuit. In response to the start signal output by the timing controller, it outputs a number of sequentially cascading pre-charge control signals, so that each first switching device in the pre-charge circuit is turned on in sequence to pre-charge the sub-pixels in the corresponding preset partition.
[0009] Optionally, the timing controller is also configured to: Based on the grayscale data, a pre-sufficient region is determined from several preset partitions; A start signal of the first level state is output to the first-level transmission circuit corresponding to the pre-fully charged area, so that the first-level transmission circuit outputs a number of first-level pre-charge control signals in sequence according to the start signal, so as to control the first switching device in the pre-charge circuit corresponding to the pre-fully charged area to pre-charge the sub-pixels in the pre-fully charged area. A second-level start signal is output to the second-level transmission circuit corresponding to the other preset partitions except the pre-charge area. The second-level transmission circuit outputs a second-level pre-charge control signal according to the start signal, so as to control the first switching device in the pre-charge circuit corresponding to the other preset partitions to turn off and stop the pre-charging of the sub-pixels in the other preset partitions.
[0010] Optionally, the display area includes several preset partitions, each pre-charging circuit is connected to a sub-pixel within a preset partition, and the pre-charging circuit includes several second switching devices; The second switching device includes a first terminal connected to a column of sub-pixels, a second terminal connected to a pre-charge voltage, and a control terminal connected to a pre-charge control signal.
[0011] Optionally, the three sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the timing controller is further configured to: Based on grayscale data, a pre-charge region is determined from several preset zones. A pre-charge control signal of the first level state is output to the pre-charge circuit corresponding to the pre-charge region, causing each second switch device in the pre-charge circuit corresponding to the pre-charge region to be turned on sequentially. When the red sub-pixel of the current scan line in the pre-charge region is being charged, the second switch device corresponding to the green sub-pixel is turned on to pre-charge the green sub-pixel of the current scan line. When the green sub-pixel of the current scan line is being charged, the second switch device corresponding to the blue sub-pixel is turned on to pre-charge the blue sub-pixel of the current scan line. When the blue sub-pixel of the current scan line is being charged, the second switch device corresponding to the red sub-pixel is turned on to pre-charge the red sub-pixel of the next scan line. A pre-charge control signal of the second level state is output to the pre-charge circuit corresponding to the other preset zones, causing each second switch device in the pre-charge circuit corresponding to the other preset zones to be turned off, stopping the pre-charging of the red, green, and blue sub-pixels in the other preset zones.
[0012] Optionally, it also includes multiple data lines and multiple charging circuits, each charging circuit being connected to a data line and a column of pixel units, and the charging circuit including a third switching device, a fourth switching device and a fifth switching device; The third switching device includes a first end connected to the data line, a second end connected to the red sub-pixel, and a control end that receives the charging control signal. The fourth switching device includes a first end connected to the data line, a second end connected to the green sub-pixel, and a control end that receives the charging control signal; The fifth switching device includes a first end connected to the data line, a second end connected to the blue sub-pixel, and a control end that receives the charging control signal; The first terminal of the second switching device is connected to the second terminal of the third switching device, the second terminal of the fourth switching device, or the second terminal of the fifth switching device.
[0013] Optionally, it may also include a power management chip; The power management chip is connected to the pre-charge circuit and is used to output a pre-charge voltage to the pre-charge circuit, wherein the pre-charge voltage is the average of the maximum and minimum values of the data voltage.
[0014] Optionally, the timing controller is also configured to: Based on the grayscale data, it is determined whether the image to be displayed is a solid color image. When it is determined that the image to be displayed is a solid color image, a pre-charge control signal in the second level state is output to stop the pre-charge circuit from pre-charging each sub-pixel.
[0015] Secondly, a pixel pre-charge control method is also proposed, applicable to any of the display devices described above, including: The timing controller determines the pre-charge area from the display area based on the grayscale data of the image to be displayed, and outputs a pre-charge control signal to control the pre-charge circuit corresponding to the pre-charge area, so as to pre-charge the sub-pixels before charging the sub-pixels in the pre-charge area.
[0016] In summary, in this application, firstly, several pre-charging circuits are set in the display device; then, a pre-charging zone is determined in the display of the display device based on the grayscale data of the image to be displayed by a timing controller, and a pre-charging control signal is output to control the pre-charging circuit corresponding to the pre-charging zone. Before each sub-pixel in the pre-charging zone is charged, each sub-pixel in the pre-charging zone is pre-charged to the pre-charging voltage, so that when each sub-pixel in the pre-charging zone is connected to the data voltage, it can start charging or discharging from the pre-charging voltage, shortening the charging time required for each sub-pixel in the pre-charging zone, thereby solving the problem of insufficient charging of pixel units, improving the display effect of the display device, and realizing zoned pre-charging of the display device to reduce the pre-charging power consumption requirement.
[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of a display device provided in an exemplary embodiment of this application; Figure 2 This is another schematic diagram of the display device provided in an exemplary embodiment of this application; Figure 3 This is a circuit schematic diagram of a sub-pixel provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of a pre-charging circuit provided in an exemplary embodiment of this application; Figure 5 This is yet another schematic diagram of the display device provided in an exemplary embodiment of this application; Figure 6 This is a schematic diagram of another pre-charging circuit provided in an exemplary embodiment of this application; Figure 7 This is a comparative schematic diagram of the charging waveforms provided in an exemplary embodiment of this application; Figure 8 This is a schematic flowchart of the pixel pre-charge control method provided in an exemplary embodiment of this application.
[0020] Explanation of icon numbers: 101. Display area; 102. Pre-charge circuit; 103. Timing controller; 104. Cascade circuit; 105. Charging circuit; 106. Power management chip; 107. Source driver; 108. Gate driver; 109. Light emission controller; PX. Pixel unit; R. Red sub-pixel; G, Green subpixel; B, Blue subpixel; SW1, First switching device; SW2, second switching device; SW3, third switching device; SW4, fourth switching device; SW5, fifth switching device; T1, first transistor; T2, second transistor; T3, the third transistor; T4, the fourth transistor; T5, the fifth transistor; T6, the sixth transistor; T7, the seventh transistor; Cst, the storage capacitor.
[0021] The realization of the objectives, functional features and advantages of the embodiments of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0023] Firstly, referring to Figure 1 This embodiment provides a display device, which may include a display area 101, a plurality of pre-charging circuits 102, and a timing controller 103. The display area 101 includes a plurality of pixel units PX arranged in an array, each pixel unit PX including three sub-pixels arranged horizontally; the plurality of pre-charging circuits 102, each pre-charging circuit 102 being connected to a plurality of sub-pixels; the timing controller 103, connected to the pre-charging circuits 102, is configured to: determine a pre-charging zone from the display area 101 based on the grayscale data of the image to be displayed, and output a pre-charging control signal to control the pre-charging circuits 102 corresponding to the pre-charging zone to pre-charge the sub-pixels before charging the sub-pixels within the pre-charging zone.
[0024] In this embodiment, firstly, the display area 101 of the display device may include data lines (D1~Dm) for transmitting data voltage DATA, scan lines (G1~Gn) for transmitting scan signal SCAN, and multiple pixel units PX. Each pixel unit PX includes horizontally arranged red sub-pixels R, green sub-pixels G, and blue sub-pixels B. Sub-pixels in the same row are connected by a scan line; sub-pixels in the same column are connected by a data line, or the red sub-pixels R, green sub-pixels G, and blue sub-pixels B in the same column of pixel unit PX are all connected to a data line. The following embodiment describes the second data line connection method. Secondly, a plurality of pre-charging circuits 102 may include pre-charging circuits 1021~102k. Each pre-charging circuit 102 can be connected to multiple sub-pixels, so that the plurality of pre-charging circuits 102 can pre-charge the multiple sub-pixels connected to them respectively, realizing the partitioned pre-charging of the display area 101, shortening the charging time required for each sub-pixel, solving the problem of insufficient charging time of pixel unit PX, and improving the display effect of the display device. Finally, refer to Figure 2The display device may further include a source driver 107 and a gate driver 108. The timing controller 103 can receive image data and control signals from the screen to be displayed, and perform preprocessing such as format conversion and data sorting on the image data to obtain grayscale data. Simultaneously, the timing controller 103 can also generate control signals and clock signals, sending the grayscale data and control signals to the source driver 107 and gate driver 108 respectively. The gate driver 108 may include several cascaded gate driving circuits. Each gate driving circuit receives control signals and clock signals from the timing controller 103 to output a progressive scan signal (SCAN) to each scan line. The source driver 107 receives grayscale data and clock signals from the timing controller 103 to output a data voltage (DATA) to each data line. Furthermore, the timing controller 103 can also set a dynamic brightness threshold to detect the brightness difference between different areas of the display screen. When the brightness difference between different areas of the display screen exceeds the dynamic brightness threshold, the area corresponding to the brighter area in the display area 101 is designated as the pre-charge area. A pre-charge control signal is output according to the clock signal to control the pre-charge circuit 102 corresponding to the pre-charge area to pre-charge each sub-pixel in the pre-charge area before charging. This achieves pre-charging only in the brighter pre-charge area, reducing unnecessary pre-charging and saving pre-charge power consumption.
[0025] It should be noted that in the embodiments of this application, each sub-pixel may include a light-emitting device and a sub-pixel driving circuit, as shown in the reference. Figure 3The sub-pixel driving circuit may include a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, and a storage capacitor Cst. The first transistor T1 includes a first terminal connected to the second transistor T2 and the fifth transistor T5, a second terminal connected to the third transistor T3 and the sixth transistor T6, and a control terminal connected to the storage node. The second transistor T2 includes a first terminal connected to a data line, a second terminal connected to the fifth transistor T5 and the first transistor T1, and a control terminal connected to a scan line. The third transistor T3 includes a first terminal connected to the first transistor T1 and the sixth transistor T6, a second terminal connected to the storage node, and a control terminal connected to the scan line. The fourth transistor T4 includes a first terminal connected to a reset voltage Vi, a second terminal connected to the storage node, and a terminal connected to a reset enable signal. The fifth transistor T5 includes a first terminal connected to the anode power supply voltage VDD, a second terminal connected to the second transistor T2 and the first transistor T1, and a control terminal connected to the light emission control signal EM; the sixth transistor T6 includes a first terminal connected to the third transistor T3 and the first transistor T1, a second terminal connected to the anode of the light-emitting device, and a control terminal connected to the light emission control signal; the seventh transistor T7 includes a first terminal connected to the reset voltage Vi, a second terminal connected to the anode, and a control terminal connected to the reset enable signal reset; the storage capacitor includes a first terminal connected to the anode power supply voltage VDD and a second terminal connected to the storage node Q. The operation of the sub-pixel driving circuit can include a reset stage, a charging stage, and a light emission stage. First, the reset enable signal reset controls the sub-pixel driving circuit to enter the reset stage, resetting the voltage of the storage node Q using the reset voltage Vi. Then, the scan signal SACN controls the sub-pixel driving circuit to enter the storage node Q, charging the storage node Q using the data voltage DATA. Finally, the light emission control signal EM controls the sub-pixel driving circuit to enter the light emission stage, driving the light-emitting device to emit light using the anode power supply voltage VDD and the voltage of the storage node Q. Among them, the third transistor T3 and the fourth transistor T4 can be dual-gate transistors. Furthermore, continue to refer to... Figure 2 The display device may also include a power management chip 106 and a light-emitting controller 109. The power management chip 106 is used to provide a reset voltage Vi, an anode power supply voltage VDD, a common ground voltage VSS, and a precharge voltage Vpre. The light-emitting controller 109 is connected to a timing controller 103 and is used to output a light-emitting control signal EM according to the received control signal and timing signal.
[0026] Next, we will describe in detail the specific implementation methods that the display device may adopt, based on the above-described sub-pixel circuit structure.
[0027] Reference Figure 4 In some embodiments, the display area 101 may include a plurality of preset partitions, and each pre-charging circuit 102 is connected to each sub-pixel in a preset partition. The pre-charging circuit 102 may include a plurality of first switching devices SW1. The first switching device SW1 includes a first end connected to a row of sub-pixels, a second end connected to the pre-charging voltage, and a control end connected to the pre-charging control signal.
[0028] In this embodiment, the display area 101 can be pre-divided into several preset partitions, and a pre-charging circuit 102 can be set up for each preset partition to perform pre-charging, thereby realizing partition pre-charging of the display area 101. For example, the display area 101 can be pre-divided into several preset partitions arranged sequentially along the vertical direction, and a pre-charging circuit 102 can be used for each preset partition. Then, for each preset partition, a first switching device SW1 is used to connect to the data line of a row of sub-pixels to realize the pre-charging of a row of sub-pixels. The first switching device SW1 can be selected according to the actual use. In one example, the first switching device SW1 is a TFT transistor, and the display area 101 can be divided into a first partition, a second partition, and a third partition. The first partition includes sub-pixels from row 1 to row i, the second partition includes sub-pixels from row i+1 to row j, and the third partition includes sub-pixels from row j+1 to row n. Correspondingly, the plurality of pre-charging paths 102 include a first group of pre-charging paths, a second group of pre-charging paths, and a third group of pre-charging paths. The first group of pre-charging paths is used to pre-charge the first partition, the second group of pre-charging paths is used to pre-charge the second partition, and the third group of pre-charging paths is used to pre-charge the third partition. The pre-charge region can be located within at least one preset partition. When the pre-charge region is located in the first partition, under the drive of the timing controller 103, pre-charge control signals SW(1)~SW(i) of the first level state can be output sequentially to the first group of pre-charge circuits, controlling the first to i first switching devices SW1 corresponding to the first partition to be turned on sequentially. Before the scan line G1 is connected to the scan signal SCAN, the first switching device SW1 of the first row is turned on to pre-charge the sub-pixels of the first row. When the scan line G1 is connected to the scan signal SCAN, the first switching device SW1 of the first row is turned off, and the first switching device SW1 of the second row is turned on to pre-charge the sub-pixels of the second row. Thus, when the scan line Gi-1 is connected to the scan signal SCAN, the first switching device SW1 of the (i-1)th row is turned off, and the first switching device SW1 of the ith row is turned on to pre-charge the sub-pixels of the ith row, thereby realizing the pre-charge of the first partition. It can be understood that the timing of the pre-charge control signal SW(n) is one scan interval ahead of the scan signal SCAN.
[0029] The number of preset partitions can be determined based on at least one of the actual control performance of the timing controller 103 and the brightness characteristics of commonly used display screens. The number of rows of sub-pixels in the preset partitions can be evenly distributed or distributed according to the brightness characteristics of commonly used display screens in the actual usage scenario. For example, if the commonly used display screen is a screen with frequently changing brightness, the number of rows of sub-pixels in the preset partitions can be evenly distributed; if the brightness of a certain area of the commonly used display screen is greater than that of other areas for a long time, then the sub-pixels corresponding to that area can be divided into a preset partition.
[0030] It is understandable that when the brightness difference of the screen to be displayed is small, there is no need to perform zone pre-charging. At this time, the timing controller 103 controls the first switching device SW1 connected to the first row to the nth row to turn on in sequence, thereby realizing the overall pre-charging of the entire display area 101.
[0031] In some embodiments, refer to Figure 5 The display device may also include several transmission circuits 104. The transmission circuits 104 are connected to a timing controller 103 and a pre-charge circuit 102, and are used to output several sequentially transmitted pre-charge control signals in response to the start signal output by the timing controller 103, so that each first switching device SW1 in the pre-charge circuit 102 is turned on in sequence to pre-charge the sub-pixels in the corresponding preset partition.
[0032] In this embodiment, a cascading circuit 104 can be provided for each pre-charge circuit 102. Since this cascading circuit 104 can output several sequentially cascaded pre-charge control signals based on a single start signal from the timing control signal, it controls the sequential activation of each first switching device SW1 in the corresponding pre-charge circuit 102. This reduces the signal output pressure on the timing controller 103 and lowers its control complexity. For example, the cascading circuit 104 can be implemented using cascaded shift registers. It is understood that when partitioned pre-charge is not required, a separate cascading circuit 104 is not necessary; instead, the gate drive circuit can be reused to control the sequential activation of each first switching device SW1.
[0033] In some specific embodiments, the timing controller 103 may also be configured to: determine a pre-charge region from several preset partitions based on grayscale data; output a first-level start signal to the first-level transmission circuit corresponding to the pre-charge region, so that the first-level transmission circuit outputs several sequentially transmitted first-level pre-charge control signals according to the start signal, thereby controlling each first switching device SW1 in the pre-charge circuit 102 corresponding to the pre-charge region to be turned on sequentially, and pre-charge the sub-pixels in the pre-charge region; output a second-level start signal to the second-level transmission circuit corresponding to the other preset partitions excluding the pre-charge region, so that the second-level transmission circuit outputs a second-level pre-charge control signal according to the start signal, thereby controlling each first switching device SW1 in the pre-charge circuit 102 corresponding to the other preset partitions to be turned off, and stop pre-charging the sub-pixels in the other preset partitions.
[0034] In this embodiment, after detecting a pre-charge zone, the timing controller 103 outputs a first-level start signal to the first-stage transmission circuit corresponding to the preset zone for each pre-charge zone, activating the first-stage transmission circuit. This causes the first-stage transmission circuit to output a series of sequentially transmitted first-level pre-charge control signals to the pre-charge circuit 102 corresponding to the pre-charge zone, enabling the pre-charge circuit 102 to perform its pre-charge function. For the remaining preset zones (excluding the pre-charge zone), the timing controller 103 outputs a second-level start signal, deactivating the second-stage transmission circuit corresponding to the remaining preset zones. This causes the second-stage transmission circuit to output a series of sequentially transmitted second-level pre-charge control signals to the pre-charge circuit 102 corresponding to the remaining preset zones, deactivating the pre-charge function of the pre-charge circuit 102. This reduces unnecessary pre-charging and saves pre-charge power consumption. The first level can be low, and the second level can be high; conversely, the first level can be high, and the second level can be low.
[0035] Reference Figure 6 In other embodiments, the display area 101 includes a plurality of preset partitions, and each pre-charging circuit 102 is connected to a sub-pixel within a preset partition. The pre-charging circuit 102 includes a plurality of second switching devices SW2. The second switching device SW2 includes a first end connected to a column of sub-pixels, a second end connected to a pre-charging voltage, and a control end connected to a pre-charging control signal.
[0036] In this embodiment, the display area 101 can be pre-divided into several preset partitions arranged sequentially in the horizontal direction. For each preset partition, a pre-charging circuit 102 is used for pre-charging. Then, for each preset partition, a column of sub-pixels is pre-charged using a second switching device SW2. The second switching device SW2 can be selected according to actual usage. In one example, the second switching device SW2 is a TFT transistor. For example, the display area 101 can be divided into a fourth partition and a fifth partition. The fourth partition includes sub-pixels from column 1 to column z, and the fifth partition includes sub-pixels from column z+1 to column m; z and m are positive integers. Correspondingly, the pre-charging circuit 102 includes a fourth set of pre-charging circuits and a fifth set of pre-charging circuits. The fourth set of pre-charging circuits is used to pre-charge the fourth partition, and the fifth set of pre-charging circuits is used to pre-charge the fifth partition. The pre-charge region can be located within at least one preset partition. When the pre-charge region is located in the fourth partition, the timing controller 103 can sequentially output the pre-charge control signal SW(R), the pre-charge control signal SW(G), and the pre-charge control signal SW(B). Before the red sub-pixel R connected to the scan line Gx is charged, the second switching device SW2 corresponding to each red sub-pixel R is turned on to pre-charge each red sub-pixel R in the fourth partition connected to the scan line Gx. When the red sub-pixel R connected to the scan line Gx is charged, the second switching device SW2 corresponding to each green sub-pixel G located in the same row and adjacent to the red sub-pixel R is controlled. When 2 is turned on, each green sub-pixel G in the fourth partition connected by scan line Gx is pre-charged; while each green sub-pixel G connected by scan line Gx is charging, the second switching device SW2 corresponding to each blue sub-pixel B located in the same row and adjacent to the green sub-pixel R is turned on, and each blue sub-pixel B in the fourth partition connected by scan line Gx is pre-charged; while controlling the charging of each blue sub-pixel B connected by scan line Gx, the second switching device SW2 corresponding to each red sub-pixel R in the next row adjacent to the blue sub-pixel B is turned on, and each red sub-pixel R in the fourth partition connected by scan line Gx+1 is pre-charged.
[0037] Understandably, when pre-charging in a partitioned manner is required, the timing controller 103 can output multiple sets of pre-charging control signals. One set of pre-charging control signals is used to control one pre-charging circuit 102. The pre-charging control signals may include SW(R), SW(G), and SW(B). When pre-charging in a partitioned manner is not required, the timing controller 103 only needs to output one set of pre-charging control signals in a loop to pre-charge the pixel units of the entire display area.
[0038] In addition, the preset partitions can be divided in one direction of the plane of the display area 101; or they can be divided in two directions at the same time. For example, the display area 101 can be divided into regions in the horizontal direction and then divided into regions in the vertical direction to obtain four preset partitions.
[0039] It should be noted that the source driver 107 is a data line that simultaneously outputs the data voltage DATA to each pixel unit PX. Therefore, a charging circuit 105 needs to be set up so that the red sub-pixel R, green sub-pixel G, and blue sub-pixel B in the same pixel unit PX are connected to the data voltage DATA sequentially for charging.
[0040] Therefore, referring to Figure 3 In some specific embodiments, the display device may further include multiple charging circuits 105, each charging circuit 105 being connected to a data line and a column of pixel units PX. Each charging circuit 105 includes a third switching device SW3, a fourth switching device SW4, and a fifth switching device SW5. The third switching device SW3 includes a first end connected to the data line, a second end connected to the red sub-pixel R, and a control end that receives a charging control signal. The fourth switching device SW4 includes a first end connected to the data line, a second end connected to the green sub-pixel G, and a control end that receives a charging control signal. The fifth switching device SW5 includes a first end connected to the data line, a second end connected to the blue sub-pixel B, and a control end that receives a charging control signal. The first end of the second switching device SW2 is connected to the second end of the third switching device SW3, the second end of the fourth switching device SW4, or the second end of the fifth switching device SW5.
[0041] In this embodiment, the charging circuit 105 adopts the MUX3 driving architecture. The timing controller 103 can also output charging control signals MUX(R) to each third switching device SW3, output charging control signals MUX(G) to each fourth switching device SW4, and output charging control signals MUX(B) to each fifth switching device SW5 in sequence according to the timing signal, so that each red sub-pixel R connected to the same scan line is charged at the same time. After each red sub-pixel R is charged, each green sub-pixel G connected to the scan line is charged at the same time. After each green sub-pixel G is charged, each blue sub-pixel B connected to the scan line is charged at the same time. And after each blue sub-pixel B is charged, each red sub-pixel R connected to the next scan line is charged at the same time.
[0042] In some specific embodiments, the timing controller 103 can also be configured to: determine a pre-charge region from several preset partitions based on grayscale data; output a pre-charge control signal of the first level state to the pre-charge circuit corresponding to the pre-charge region, so that each second switching device SW2 in the pre-charge circuit corresponding to the pre-charge region is turned on sequentially, so that when the red sub-pixel R of the current scan line in the pre-charge region is charged, the second switching device SW2 corresponding to the green sub-pixel G is turned on to pre-charge the green sub-pixel G of the current scan line; and when the green sub-pixel G of the current scan line is charged, the second switching device SW2 corresponding to the blue sub-pixel B is turned on. The second switching device SW2 is turned on to precharge the blue sub-pixel B in the current scan line. While the blue sub-pixel B in the current scan line is being charged, the second switching device SW2 corresponding to the red sub-pixel R is turned on to precharge the red sub-pixel R in the next scan line. A precharge control signal of the second level state is output to the precharge circuit corresponding to the other preset partitions except the pre-charged area, so that the second switching device SW2 in the precharge circuit corresponding to the other preset partitions is turned off, and the precharging of the red sub-pixel R, green sub-pixel G and blue sub-pixel B in the other preset partitions is stopped.
[0043] In this embodiment, after detecting the pre-charge zone, the timing controller 103 outputs a first-level pre-charge control signal to the pre-charge circuit 102 corresponding to the pre-charge zone for each preset zone, so that the pre-charge circuit 102 corresponding to the pre-charge zone enables the pre-charge function; and for the other preset zones other than the pre-charge zone, it outputs a second-level pre-charge control signal to the pre-charge circuit 102 corresponding to the other preset zones, so that the pre-charge circuit 102 corresponding to the other preset zones disables the pre-charge function, thereby reducing unnecessary pre-charge and achieving the purpose of saving pre-charge power consumption.
[0044] In some embodiments, the display device may further include a power management chip 106. The power management chip 106 is connected to a pre-charging circuit 102 and is used to output a pre-charging voltage to the pre-charging circuit 102. The pre-charging voltage is the average of the maximum and minimum values of the data voltage DATA, and the maximum and minimum values of the data voltage DATA can be preset according to actual conditions.
[0045] In this embodiment, the pre-charge voltage Pre of the pre-charge circuit 102 can be provided by the power management chip 106 of the display device. Furthermore, the magnitude of the pre-charge voltage Pre is determined based on the magnitude of the data voltage; preferably, the pre-charge voltage Pre is the average of the maximum and minimum values of the data voltage DATA.
[0046] In other embodiments, the timing controller 103 is further configured to: determine whether the image to be displayed is a solid color image based on grayscale data, and when the image to be displayed is determined to be a solid color image, output a pre-charge control signal of the second level state, so that the pre-charge circuit 102 stops pre-charging each sub-pixel.
[0047] In this embodiment, when the grayscale data of each data line in the display area 101 remains unchanged, the screen to be displayed is a solid color screen. For a solid color screen, the timing controller 103 can output a pre-charge control signal in the second level state to control each first switching device SW1 or second switching device SW2 in the pre-charge circuit 102 to remain in the off state, so as to stop pre-charging each sub-pixel, reduce unnecessary pre-charging, and thus achieve the purpose of saving pre-charge power consumption.
[0048] Understandably, for displays with small brightness differences, the pre-charging function of the pre-charging circuit 102 can be turned off to save power.
[0049] Finally, the pre-charging effect provided by the embodiments of this application is explained in conjunction with the charging and discharging process of the sub-pixel driving circuit. In practical use, the charging and discharging process of each sub-pixel can be simplified to RC circuit charging and discharging; therefore, the voltage response of constant voltage charging for each sub-pixel is: ; Thus, each sub-pixel is charged from the initial voltage U to the target voltage U. data The required charge / discharge time t is: ; Where C is the capacitance of the storage capacitor Cst, and R is the equivalent resistance of the charging circuit during the charging phase. For example... Figure 7 As shown in Figure 7a, without pre-charging, the initial voltage U=0V. If it is charged from 0V to 0.9×U... data The required charge / discharge time is t = 2.3RC. For example... Figure 7 As shown in 7b, after pre-charging through the pre-charging circuit 102 of this application, the initial voltage U = 0.5 × U data From 0.5×U data Charged to 0.9×U data The required charge / discharge time t = 1.6 × RC, thereby shortening the charge / discharge time of each sub-pixel.
[0050] Secondly, referring to Figure 8 This embodiment provides a pixel pre-charge control method, which is applied to a display device as described in any of the above embodiments, and may include step S801.
[0051] S801: The timing controller determines the pre-charge area from the display area based on the grayscale data of the image to be displayed, and outputs a pre-charge control signal to control the pre-charge circuit corresponding to the pre-charge area, so as to pre-charge the sub-pixels before charging the sub-pixels in the pre-charge area.
[0052] In this embodiment, the pixel pre-charge control method is implemented in the same way as the display device in any of the above embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments. For the sake of brevity, it will not be described in detail here.
[0053] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0055] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.
[0056] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A display device, characterized in that, include: The display area includes multiple pixel units arranged in an array, wherein each pixel unit includes three sub-pixels arranged horizontally; If the charging path is interfered with, each of the pre-charging paths is connected to multiple of the sub-pixels; The timing controller, connected to the pre-charge circuit, is configured to: Based on the grayscale data of the image to be displayed, a pre-charge area is determined from the display area, and a pre-charge control signal is output to control the pre-charge circuit corresponding to the pre-charge area to pre-charge the sub-pixel before charging the sub-pixel in the pre-charge area.
2. The display device according to claim 1, characterized in that, The display area includes several preset partitions, and each of the pre-charging circuits is connected to each of the sub-pixels in one of the preset partitions. The pre-charging circuit includes several first switching devices. The first switching device includes a first terminal connected to a row of sub-pixels, a second terminal connected to a pre-charge voltage, and a control terminal connected to the pre-charge control signal.
3. The display device according to claim 2, characterized in that, It also includes several stages of transmission circuits; The cascading circuit is connected to the timing controller and a pre-charging circuit, and is used to output a number of sequentially cascading pre-charging control signals in response to the start signal output by the timing controller, so that each of the first switching devices in the pre-charging circuit is turned on in sequence to pre-charge the sub-pixels in the corresponding preset partition.
4. The display device according to claim 3, characterized in that, The timing controller is also configured to: Based on the grayscale data, the pre-sufficient region is determined from several preset partitions; The first-level transmission circuit corresponding to the pre-charged region outputs the start signal in the first-level transmission state, so that the first-level transmission circuit outputs a number of pre-charge control signals in the first level state in sequence according to the start signal, so as to control each of the first switching devices in the pre-charge circuit corresponding to the pre-charged region to be turned on in sequence, and to pre-charge the sub-pixel in the pre-charged region. The second-level transmission circuit outputs the start signal in the second level state to the second-level transmission circuit corresponding to the other preset partitions except the pre-charge area, so that the second-level transmission circuit outputs the pre-charge control signal in the second level state according to the start signal, so as to control the first switching device in the pre-charge circuit corresponding to the other preset partitions to turn off, and stop the pre-charging of the sub-pixels in the other preset partitions.
5. The display device according to claim 1, characterized in that, The display area includes several preset partitions, and each of the pre-charging circuits is connected to a sub-pixel within one of the preset partitions. The pre-charging circuit includes several second switching devices. The second switching device includes a first terminal connected to a column of the sub-pixels, a second terminal connected to a pre-charge voltage, and a control terminal connected to the pre-charge control signal.
6. The display device according to claim 5, characterized in that, The three sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the timing controller is further configured to: Based on the grayscale data, the pre-sufficient region is determined from several preset partitions; A pre-charge control signal of the first level state is output to the pre-charge circuit corresponding to the pre-charge area, so that each of the second switching devices in the pre-charge circuit corresponding to the pre-charge area is turned on in sequence. When the red sub-pixel of the current scan line in the pre-charge area is charged, the second switching device corresponding to the green sub-pixel is turned on to pre-charge the green sub-pixel of the current scan line. When the green sub-pixel of the current scan line is charged, the second switching device corresponding to the blue sub-pixel is turned on to pre-charge the blue sub-pixel of the current scan line. When the blue sub-pixel of the current scan line is charged, the second switching device corresponding to the red sub-pixel is turned on to pre-charge the red sub-pixel of the next scan line. The precharge control signal of the second level state is output to the precharge circuit corresponding to the other preset partitions except the precharge area, so that the second switching device in each of the precharge circuits corresponding to the other preset partitions is turned off, and the precharge of the red sub-pixel, the green sub-pixel and the blue sub-pixel in the other preset partitions is stopped.
7. The display device according to claim 6, characterized in that, It also includes multiple data lines and multiple charging circuits, each of the charging circuits being connected to one of the data lines and one column of the pixel units, and the charging circuit including a third switching device, a fourth switching device and a fifth switching device; The third switching device includes a first end connected to the data line, a second end connected to the red sub-pixel, and a control end that receives a charging control signal. The fourth switching device includes a first end connected to the data line, a second end connected to the green sub-pixel, and a control end that receives the charging control signal. The fifth switching device includes a first end connected to the data line, a second end connected to the blue sub-pixel, and a control end that receives the charging control signal. The first end of the second switching device is connected to the second end of the third switching device, the second end of the fourth switching device, or the second end of the fifth switching device.
8. The display device according to any one of claims 1 to 7, characterized in that, It also includes power management chips; The power management chip is connected to the pre-charge circuit and is used to output a pre-charge voltage to the pre-charge circuit, wherein the pre-charge voltage is the average of the maximum and minimum values of the data voltage.
9. The display device according to claim 1, characterized in that, The timing controller is also configured to: Based on the grayscale data, it is determined whether the image to be displayed is a solid color image. When it is determined that the image to be displayed is a solid color image, the pre-charge control signal in the second level state is output to stop the pre-charge circuit from pre-charging each of the sub-pixels.
10. A pixel pre-charge control method, characterized in that, Applied to the display device as described in any one of claims 1 to 9, comprising: Based on the grayscale data of the image to be displayed, a pre-charge area is determined from the display area, and a pre-charge control signal is output to control the pre-charge circuit corresponding to the pre-charge area to pre-charge the sub-pixel before charging the sub-pixel in the pre-charge area.