Display driving method, apparatus, and display device

Abstract

The application provides a display driving method, device and display device. The method comprises the following steps: outputting first image data to a display panel after the i-th frame image data of the display panel is outputted and before the (i+1)-th frame image data is displayed, and controlling the first pixel row to the n-th pixel row of the display panel to perform data scanning in sequence; i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel; and the output of the (i+1)-th frame image data is triggered after the data scanning of the n-th pixel row is completed. By using the method, the image corresponding to the first image data is refreshed by the first pixel row to the n-th pixel row after the image data is refreshed and displayed, so as to overwrite the voltage signal coupled between the pixel circuit traces, restore the coupled voltage signal to normal, and thus improve the poor image quality problem caused by the coupling of the electrical signal on the pixel circuit traces.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and particularly to a display driving method, device and display device. Background Art

[0002] The Low Temperature Polycrystalline Oxide (LTPO) screen technology has the advantage of supporting dynamic refresh rates. For example, the refresh rate can be from 1Hz to 120Hz. A lower refresh rate can bring lower power consumption, and the power can be saved by reducing the refresh rate.

[0003] However, with the increase in the resolution of display products, the pitch of the pixel circuit traces becomes smaller and smaller. A smaller pitch of the pixel circuit traces will cause the electrical signals on the traces to be easily coupled. Especially in the low refresh frequency state, the image quality problem of voltage jumps caused by signal coupling is highlighted, resulting in image quality problems in the case of low refresh rates. Summary of the Invention

[0004] The purpose of the technical solution of the present invention is to provide a display driving method, device and display device, which are used to solve the problem of poor image quality caused by signal coupling between pixel circuit traces in the prior art.

[0005] One embodiment of the present invention provides a display driving method, which includes:

[0006] After the output of the i-th frame of image data of the display panel and before the display of the (i + 1)-th frame of image data, output first image data to the display panel, and control the first pixel row to the n-th pixel row of the display panel to perform data scanning in sequence; where i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel;

[0007] After the data scanning of the n-th pixel row is completed, trigger the output of the (i + 1)-th frame of image data.

[0008] Optionally, in the display driving method, outputting the first image data to the display panel includes:

[0009] Output the first voltage value corresponding to the first image data to each column pixel circuit of the display panel.

[0010] Optionally, in the display driving method, the first voltage value is less than the highest voltage value output to the pixel circuit when the i-th frame of image data is displayed.

[0011] Optionally, the display driving method further includes:

[0012] Before the output of the i-th frame of image data, obtain the voltage data converted by the source driving chip according to the i-th frame of image data;

[0013] Generate a voltage signal for displaying the i-th frame of image data according to the voltage data and the first voltage value.

[0014] Optionally, the display driving method, wherein outputting first image data to the display panel includes:

[0015] Output the voltage signal to the display panel, and the output timing of the first voltage value in the voltage signal is after the output timing of the voltage data.

[0016] Optionally, the display driving method, wherein the method further includes:

[0017] After the output of the i-th frame of image data, obtain a trigger signal for triggering the output of the first image data;

[0018] Wherein, outputting first image data to the display panel includes:

[0019] Output the first image data to the display panel according to the trigger signal.

[0020] One embodiment of the present invention further provides a display driving device, which includes:

[0021] A first function module, configured to output first image data to the display panel after the output of the i-th frame of image data of the display panel and before the display of the i + 1-th frame of image data;

[0022] A first driving module, configured to control the data scanning of the first pixel row to the n-th pixel row of the display panel in sequence when the first function module outputs first image data to the display panel; wherein, i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel;

[0023] A second driving module, configured to trigger the output of the i + 1-th frame of image data after the data scanning of the n-th pixel row is completed.

[0024] Optionally, the display driving device, wherein the first function module outputs first image data to the display panel, including:

[0025] The first function module outputs the first voltage value corresponding to the first image data to each column pixel circuit of the display panel.

[0026] Optionally, in the display driving device, the first functional module is further configured to: acquire voltage data converted by the source driving chip according to the i-th frame image data before the i-th frame image data is output; and generate a voltage signal for displaying the i-th frame image data according to the voltage data and the first voltage value.

[0027] Optionally, in the display driving device, the first functional module outputs first image data to the display panel, including:

[0028] After the i-th frame of image data is output, the first functional module acquires a trigger signal to trigger the output of the first image data, and outputs the first image data to the display panel according to the trigger signal.

[0029] One embodiment of the present invention also provides a display device, which includes a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the display driving method as described in any of the preceding claims.

[0030] At least one of the above technical solutions in the specific embodiments of the present invention has the following beneficial effects:

[0031] The display driving method described in this embodiment of the invention outputs first image data to the display panel after one frame of image data is refreshed and displayed, and before the next frame of image data is refreshed, and performs data scanning from the first pixel row to the nth pixel row, so that after one frame of image data is refreshed and displayed, the image corresponding to the first image data is refreshed and displayed from the first pixel row to the nth pixel row, thereby rewriting the voltage signals coupled between the pixel circuit traces, restoring the coupled voltage signals to normal, and thus improving the poor image quality problem caused by the coupling of electrical signals on the pixel circuit traces. Attached Figure Description

[0032] Figure 1 This is a diagram showing the voltage status of pixel columns on the display panel, excluding black pixels.

[0033] Figure 2 This is a diagram showing the voltage status of the pixel columns, including the black pixels, on the display panel.

[0034] Figure 3 This is a flowchart illustrating the display driving method according to an embodiment of the present invention;

[0035] Figure 4 This diagram illustrates one of the circuit connection structures using the display driving method described in the embodiments of the present invention.

[0036] Figure 5 This diagram illustrates the voltage state of the display driving method described in the embodiments of the present invention.

[0037] Figure 6 This is the second schematic diagram showing the circuit connection structure of the display driving method described in the embodiment of the present invention;

[0038] Figure 7 This is the third schematic diagram showing the circuit connection structure of the display driving method described in the embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of the display driving device according to an embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the pixel circuit structure of one embodiment of the display driving method described in this invention. Detailed Implementation

[0041] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0042] As the resolution of display products increases, the spacing between pixel circuit traces becomes smaller and smaller. The smaller spacing between pixel circuit traces inevitably increases parasitic capacitance, making it easy for electrical signals on the pixel circuit traces to couple, resulting in voltage jumps and poor image quality. This is especially noticeable at low refresh rates (such as 1Hz), where the poor image quality caused by voltage jumps due to signal coupling is highlighted.

[0043] For example, consider a display product with a refresh rate of 1Hz that produces poor image quality with dark bands:

[0044] In 1Hz mode, when the last pixel row includes a black block, the source voltage for displaying black columns is higher than that for displaying white columns, for different column pixels. Figure 1 and Figure 2 and combined Figure 9 As shown, the voltage on the source data line (Data line) of the black column is coupled upwards to the voltage at point N1 of that column's pixel (i.e., the gate voltage of thin-film transistor T3), pulling the source voltage high and increasing the potential at point N1. This results in lower brightness and dark bands in that column. Conversely, the source voltage of the white column is low, with less instantaneous coupling, and the brightness is normal. At a refresh rate of 1Hz, the data signal refresh interval is relatively long (1 second), making this defect more easily detected by the human eye, thus causing image quality issues.

[0045] To solve the above technical problems, an embodiment of the present invention provides a display driving method. After refreshing and displaying a frame of image data and before refreshing the next frame of image data, by outputting first image data to the display panel and performing data scanning on the first pixel row to the nth pixel row, after refreshing and displaying a frame of image data, the first pixel row to the nth pixel row refresh and display the image corresponding to the first image data, so as to overwrite the coupled voltage signals between the pixel circuit traces, and make the coupled voltage signals return to normal, thereby solving the problem of poor image quality caused by the coupling of electrical signals on the pixel circuit traces.

[0046] The display driving method according to an embodiment of the present invention, as Figure 3 shown, includes:

[0047] S310, after outputting the i-th frame of image data of the display panel and before displaying the (i + 1)-th frame of image data, output first image data to the display panel, and control the first pixel row to the nth pixel row of the display panel to perform data scanning in sequence; where i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel;

[0048] S320, after the nth pixel row finishes data scanning, trigger the output of the (i + 1)-th frame of image data.

[0049] In an embodiment of the present invention, the i-th frame of image data can be any frame of image data output by the display panel. By using the display driving method described in this embodiment, after any frame of image data on the display panel is displayed and before the next frame of image data is displayed, it is possible to control the first pixel row to the nth pixel row to refresh and display the image corresponding to the first image data, so as to overwrite the coupled voltage signals between the pixel circuit traces and solve the problem of poor image quality caused by the coupling of electrical signals on the pixel circuit traces.

[0050] As Figure 4This document presents a schematic diagram of a planar structure of an AMOLED (Active Matrix Organic Light Emitting Diode) display panel, illustrating the display driving method described in this application. Multiple sub-pixels of the display panel are arranged in an array, and the display panel operates on a line-by-line scanning refresh method. Specifically, sub-pixels 120 in the same row of the display panel are controlled by the same scan signal and connected to gate driving circuits respectively; sub-pixels 130 in the same column are connected to the same data signal line (also called the source signal line) Sn, receiving the source driving signal provided by the display driving chip on the data signal line Sn to obtain a data signal. During display panel driving, by sequentially controlling the scanning signal corresponding to each row to be turned on, the source driving signal provided by the display driving chip (also called the source driving chip) 110 writes the data signal into the pixel circuit via the data signal line Sn.

[0051] In one embodiment of the display driving method employing this implementation structure, it can optionally be applied to a processor connected to the display driver chip 110 and the gate driving circuit.

[0052] Optionally, in step S310, after the i-th frame image data is displayed on the display panel and before the i+1-th frame image data is displayed, the first image data can be output to the display panel through the display driver chip 110, and the first pixel row to the n-th pixel row of the display panel can be scanned sequentially through the gate drive circuit.

[0053] In this embodiment, optionally, outputting first image data to the display panel includes:

[0054] The first voltage value corresponding to the first image data is output to each column of pixel circuits of the display panel.

[0055] In one embodiment, optionally, the display driver chip 110 can output a first voltage value corresponding to the first image data to each column of pixel circuits. In another embodiment, optionally, the first voltage value corresponding to the first image data can also be output to each column of pixel circuits through a first functional module connected to the display driver chip 110. In this way, by outputting the first voltage value to each column of pixel circuits, the data signal corresponding to the first image data is provided to the sub-pixels on the same Source signal line Sn.

[0056] Optionally, in order to ensure that the input first voltage value can replicate the voltage signal coupled between the pixel circuit traces, the first voltage value is less than the highest voltage value output to the pixel circuit when the i-th frame image data is displayed.

[0057] Combination Figure 5 and Figure 9 As shown, the input of a frame of image data includes the leading edge porch time after receiving the synchronization signal and the display time after receiving the image display data (i.e., the Source data signal). In this frame of image data, when the last pixel row displays a black block, the voltage on the source data line of the black column is upwardly coupled to the voltage of point N1 of this column of pixels (i.e., the gate voltage of thin-film transistor T3), causing the source voltage to be pulled high. Using the method described in the embodiments of this application, after the output of this frame of image data is completed, a first voltage value lower than the highest voltage value when the frame of image data is displayed is output to the data line (Data) of each column of pixel circuit, and data scanning is performed from the first pixel row to the nth pixel row, as follows. Figure 5 As shown, when the last line of data is scanned in the i-frame image data display, the coupled voltage signal can be pulled down to solve the problem of poor image quality caused by the coupling of electrical signals on the pixel circuit traces.

[0058] It should be noted that, in this embodiment of the invention, optionally, when applied to a display panel with a low refresh rate such as 1Hz, after the last pixel row of the display panel has completed data scanning and before obtaining the synchronization signal for the output of the image data of the (i+1)th frame, there can be a sufficient time interval to refresh and display the image corresponding to the first image data from the first pixel row to the nth pixel row.

[0059] In addition, after the data scan of the nth pixel row is completed, the output of the (i+1)th frame image data is triggered, which is also the synchronization signal that triggers the output of the (i+1)th frame image data. The porch stage of the first (i+1)th frame image data output is entered. Then, the voltage signal of the (i+1)th frame image data output by the source driver chip is read, and the voltage is applied to the pixel column through the Source signal line. The gate of each pixel row is opened sequentially through the gate driver circuit to perform data scanning, so that the display panel displays the (i+1)th frame image data.

[0060] In one embodiment, optionally, the first image data is an image with a set grayscale display parameter, for example, the set grayscale is any one of 3, 5, 10, etc.; or, the first image data is an image with different grayscale display parameters displayed cyclically, for example, the first image data is formed as an image with grayscale display parameters of 3, 5, 10, etc., cyclically input according to a preset period. Of course, it is not limited to this, and the image format and the set grayscale used for the output display of the first image data can be dynamically adjusted during the display panel manufacturing process and determined based on the display state result of the display panel after adjustment.

[0061] In one embodiment of the present invention, optionally, after each frame of image data is output and before the next frame of image data is output, first image data is output respectively, and the output first image data is the same. That is, a first voltage value for presenting a set grayscale is output to each column of pixel circuits.

[0062] like Figure 6 The diagram shown is a system structure diagram of another implementation of the display driving method described in the embodiments of this application.

[0063] In this embodiment, the display system using the display driving method described in this embodiment includes a first functional module in addition to a source driver chip. The first functional module can be a chip that can convert image brightness data into voltage signals for pixel circuits. In this embodiment, the first functional module is connected in series with the source driver chip, and the voltage data of the i-th frame image data output to the display panel is output to each data signal line through the first functional module.

[0064] Using this implementation structure, the method further includes:

[0065] Before the i-th frame of image data is output, the first functional module acquires the voltage data converted by the source driver chip based on the i-th frame of image data;

[0066] The voltage signal displayed in the i-th frame image data is generated based on the voltage data and the first voltage value.

[0067] Optionally, the first image data is output to the display panel, including:

[0068] The voltage signal is output to the display panel, wherein the output timing of the first voltage value in the voltage signal is after the output timing of the voltage data.

[0069] The display driving method described in this embodiment allows the processor to control the output of image data from the display driving chip and the gate driving circuit to input driving signals to the gates of each pixel row for data scanning, based on the timing of image output. Specifically, when the display driving chip provides the source driving signal for the i-th frame of image data to the pixel circuits on the data signal lines, it outputs the provided source driving signal to a first functional module. The first functional module generates a voltage signal for displaying the i-th frame of image data based on the voltage data corresponding to the power driving signal and the first voltage value corresponding to the first image data. The output timing of the first voltage value in the voltage signal is after the output timing of the voltage data, ensuring that the first voltage value corresponding to the first image data is output to each data signal line of the display panel after the i-th frame of image data is output and before the (i+1)-th frame of image data is output. Furthermore, the controller can output a control signal to the timing controller based on the image output timing, causing the gate driving circuit to sequentially control the gates of the first pixel row to the n-th pixel row to open, performing data scanning sequentially to replicate the voltage signals coupled between the pixel circuit traces.

[0070] In this implementation, optionally, the first functional module is connected to the display panel via a shift register, and the voltage signal of the i-th frame image data is written into the shift register and sequentially output to the display panel for display.

[0071] like Figure 7 The diagram shown is a system structure diagram of another implementation of the display driving method described in the embodiments of this application.

[0072] In this implementation structure, the display system using the display driving method described in this embodiment includes a first functional module in addition to a source driver chip. The first functional module is connected in parallel with the source driver chip. The voltage data of the i-th frame image data output to the display panel is output to the display panel through the source driver chip, and the first voltage value corresponding to the first image data is output to the display panel through the first functional module.

[0073] In this embodiment, the method further includes:

[0074] After the i-th frame of image data is output, a trigger signal for triggering the output of the first image data is obtained;

[0075] The process of outputting first image data to the display panel includes:

[0076] The first image data is output to the display panel according to the trigger signal.

[0077] Optionally, after the source driver chip outputs the i-th frame of image data to the display panel, a trigger signal triggered by the processor outputting the first image data to the first functional module is sent. According to this trigger signal, the first functional module outputs the first image data to the display panel.

[0078] In one embodiment, optionally, the source driver chip and the first functional module are respectively connected to the shift register. The voltage data of the i-th frame of image data output by the source driver chip and the voltage data of the first voltage value corresponding to the first image data output by the first functional module are respectively transmitted to the shift register, and are sequentially output to the display panel through the shift register for display. After the i-th frame of image data is output to the display panel and before the (i + 1)-th frame of image data is output, the first voltage value corresponding to the first image data is output to each data signal line of the display panel. In addition, the controller can also output a control signal to the timing controller, so that the gate driver circuit sequentially controls the gates of the first pixel row to the n-th pixel row to be opened according to the timing signal output by the timing controller, and data scanning is performed in sequence to rewrite the voltage signals coupled between the pixel circuit traces.

[0079] It should be noted that the above specific embodiments of the display driving method described in the embodiments of the present invention are only for illustration, and are not limited thereto specifically.

[0080] One embodiment of the present invention further provides a display driving device, as Figure 8 shown, including:

[0081] A first functional module 810, configured to output the first image data to the display panel after the i-th frame of image data of the display panel is output and before the (i + 1)-th frame of image data is displayed;

[0082] A first driving module 820, configured to control the first pixel row to the n-th pixel row of the display panel to perform data scanning in sequence when the first functional module outputs the first image data to the display panel; where i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel;

[0083] A second driving module 830, configured to trigger the output of the (i + 1)-th frame of image data after the n-th pixel row finishes data scanning.

[0084] Using the display driving device described in this embodiment of the invention, after one frame of image data is refreshed and displayed and before the next frame of image data is refreshed, the first functional module 810 outputs the first image data to the display panel, and the first driving module 820 performs data scanning from the first pixel row to the nth pixel row, so that after one frame of image data is refreshed and displayed, the image corresponding to the first image data is refreshed and displayed from the first pixel row to the nth pixel row, thereby rewriting the voltage signals coupled between the pixel circuit traces, restoring the coupled voltage signals to normal, and thus solving the problem of poor image quality caused by the coupling of electrical signals on the pixel circuit traces.

[0085] Optionally, in the display driving device, the first functional module outputs first image data to the display panel, including:

[0086] The first functional module outputs a first voltage value corresponding to the first image data to each column of pixel circuits on the display panel.

[0087] Optionally, in the display driving device, the first functional module is further configured to: acquire voltage data converted by the source driving chip according to the i-th frame image data before the i-th frame image data is output; and generate a voltage signal for displaying the i-th frame image data according to the voltage data and the first voltage value.

[0088] Optionally, in the display driving device, the first functional module outputs first image data to the display panel, including:

[0089] After the i-th frame of image data is output, the first functional module acquires a trigger signal to trigger the output of the first image data, and outputs the first image data to the display panel according to the trigger signal.

[0090] In this embodiment of the invention, the first functional module 810 may be a source driver chip or a chip that is different from the source driver chip and has a dedicated function for outputting first image data; the first driving module 820 may be a gate driver chip; the second driving module 830 may include one or more of the first functional module 810, the source driver chip and the gate driver chip.

[0091] The specific implementation of the display driving device described in the embodiments of this application can be described in conjunction with the detailed description of the specific implementation of the display driving method, and will not be repeated here.

[0092] One embodiment of the present invention also provides a display device, which includes a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the display driving method as described in any of the preceding claims.

[0093] The specific implementation of the display device described in the embodiments of the present invention can be described in detail in conjunction with the specific implementation of the display driving method, and will not be repeated here.

[0094] The above describes the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A display driving method, characterized by, The method comprises the following steps: after the i-th frame image data of the display panel is output, before the i+1-th frame image data of the display panel is displayed, first image data is output to the display panel, and the first pixel row to the n-th pixel row of the display panel are controlled to perform data scanning in sequence; wherein, i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel; after the n-th pixel row completes data scanning, the output of the i+1-th frame image data is triggered; wherein, the first image data is output to the display panel, comprising: a first voltage value corresponding to the first image data is output to each column of pixel circuits of the display panel; the first voltage value is less than the highest voltage value output to the pixel circuit when the i-th frame image data is displayed.

2. The display driving method according to claim 1, wherein The method further comprises: before the i-th frame image data is output, voltage data converted by a source driving chip according to the i-th frame image data is acquired; the voltage signal for displaying the i-th frame image data is generated according to the voltage data and the first voltage value.

3. The display driving method according to claim 2, wherein The first image data is output to the display panel, comprising: the voltage signal is output to the display panel, and the output timing of the first voltage value in the voltage signal is located after the output timing of the voltage data.

4. The display driving method according to claim 1, wherein The method further comprises: after the i-th frame image data is output, a trigger signal for triggering the output of the first image data is acquired; wherein, the first image data is output to the display panel, comprising: the first image data is output to the display panel according to the trigger signal.

5. A display driving device, characterized by comprising: The method comprises the following steps: a first function module is configured to output first image data to a display panel before the i+1-th frame image data of the display panel is displayed after the i-th frame image data of the display panel is output; a first driving module is configured to control the first pixel row to the n-th pixel row of the display panel to perform data scanning in sequence when the first function module outputs the first image data to the display panel; wherein, i is a positive integer greater than or equal to 1; n is a positive integer, and 1 < n ≤ N; N is the total number of pixel rows of the display panel; a second driving module is configured to trigger the output of the i+1-th frame image data after the n-th pixel row completes data scanning; the first function module outputs the first image data to the display panel, comprising: the first function module outputs a first voltage value corresponding to the first image data to each column of pixel circuits of the display panel; the first voltage value is less than the highest voltage value output to the pixel circuit when the i-th frame image data is displayed.

6. The display driving apparatus according to claim 5, wherein The first function module is further configured to acquire voltage data converted by a source driving chip according to the i-th frame image data before the i-th frame image data is output, and generate a voltage signal for displaying the i-th frame image data according to the voltage data and the first voltage value.

7. The display driving apparatus according to claim 5, wherein the first function module outputs the first image data to the display panel, comprising: After output of the i-th frame of image data, the first function module acquires a trigger signal for triggering output of the first image data, and outputs the first image data to the display panel according to the trigger signal.

8. A display device, characterized by comprising: The display driving method comprises a processor, a memory, and a program stored in the memory and executable on the processor, and the program is executed by the processor to implement the display driving method according to any one of claims 1 to 4.

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