Display device and display driving method

Abstract

The invention discloses a display device and a display driving method.The display device comprises a time schedule controller, a power management circuit and a source electrode driving circuit, image data to be displayed are received through the time schedule controller, whether the image data comprise crosstalk pictures or not is judged, and if yes, the crosstalk pictures are displayed; and when the image data comprises the crosstalk picture, a voltage modification instruction is sent out, the power management circuit increases the output analog power supply voltage according to the voltage modification instruction, and the source driving circuit outputs a corresponding data signal according to the analog power supply voltage. According to the technical scheme of the invention, the analog power supply voltage accessed by the source driving circuit can be improved when a crosstalk picture is displayed, and the drop amplitude of gamma voltage is reduced, so that the drop amplitude of a data signal is reduced, the crosstalk picture is improved by means of parameter modification, and hardware cost does not need to be increased. And therefore, negative effects can be reduced under the condition of improving crosstalk pictures.

Description

Technical Field

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

[0002] During the display process, crosstalk sometimes occurs, which affects the image quality.

[0003] In order to improve the crosstalk image, the related technologies use some technical means to solve the problem. However, these technical means will also bring some other negative effects while improving the crosstalk image. For example, the cost of materials such as capacitors is increased, the area of ​​the printed circuit board (PCB) is increased, and the effect is not obvious; or, the power consumption of the panel is increased and the heat generated by the source driver circuit is increased; or, the power consumption is increased and the heat generated by the inductor in the DC conversion (DCDC) circuit is increased.

[0004] Therefore, it is necessary to provide a display device to improve the crosstalk image while reducing or avoiding the above negative effects. Summary of the invention

[0005] The present application provides a display device and a display driving method to improve the technical problem of crosstalk images while reducing or avoiding negative effects.

[0006] In a first aspect, the present application provides a display device, which includes a timing controller, a power management circuit and a source driving circuit, the timing controller being configured to receive image data to be displayed, and to determine whether the image data includes a crosstalk picture, and to issue a voltage modification instruction when the image data includes a crosstalk picture; the power management circuit is connected to the timing controller, and the power management circuit is configured to increase the output analog power supply voltage according to the voltage modification instruction; the source driving circuit is connected to the power management circuit, and the source driving circuit is configured to output a corresponding data signal according to the analog power supply voltage.

[0007] In a second aspect, the present application provides a display driving method, which includes: a timing controller receives image data to be displayed, and determines whether the image data includes a crosstalk picture, and issues a voltage modification instruction when the image data includes a crosstalk picture; a power management circuit increases the output analog power supply voltage according to the voltage modification instruction; and a source driving circuit outputs a corresponding data signal according to the analog power supply voltage.

[0008] The display device and display driving method provided by the present application receive image data to be displayed through a timing controller, and determine whether the image data includes a crosstalk picture, and issue a voltage modification instruction when the image data includes a crosstalk picture. The power management circuit increases the output analog power supply voltage according to the voltage modification instruction, and the source driving circuit outputs a corresponding data signal according to the analog power supply voltage. When displaying the crosstalk picture, the analog power supply voltage connected to the source driving circuit can be increased, and the decrease amplitude of the gamma voltage is reduced, thereby reducing the decrease amplitude of the data signal. In this way, the crosstalk picture is improved by modifying parameters without increasing hardware costs, and negative effects can be reduced or avoided while improving the crosstalk picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0010] Figure 1 It is a schematic diagram of a crosstalk screen in the related art.

[0011] Figure 2 It is a schematic diagram of voltage changes corresponding to the crosstalk screen in the related technology.

[0012] Figure 3 A first structural schematic diagram of a display device provided in an embodiment of the present application.

[0013] Figure 4 A second structural schematic diagram of the display device provided in an embodiment of the present application.

[0014] Figure 5 A schematic diagram of voltage changes corresponding to the crosstalk screen provided in an embodiment of the present application.

[0015] Figure 6 A schematic diagram of a flow chart of a display driving method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0018] See also Figure 1 and Figure 2 ,like Figure 1 As shown, the crosstalk screen P10 includes a first area P11 and a second area P12. The second area P12 may be, but is not limited to, surrounding the first area P11. The first area P11 may also be adjacent to the second area P12.

[0019] Figure 1 The middle left figure exemplarily shows that all gray levels in the first area P11 are L0, and all gray levels in the second area P12 are L127; Figure 1 The middle right figure exemplarily shows that all grayscales in the first area P11 are L255, and all grayscales in the second area P12 are L127.

[0020] The reason for the appearance of the crosstalk screen P10 is that the load on the panel surface is heavy and the impedance of the line transmitting the analog power supply voltage AVDD is large. When the level of the data signal DS is switched drastically, the instantaneous current of the analog power supply voltage AVDD (taking full positive voltage drive as an example) connected to the source driver circuit 300 increases, and a large voltage drop occurs between the far and near ends of the line of the analog power supply voltage AVDD, which easily causes the output voltage of the source driver circuit 300 to drop, and lateral crosstalk appears in the screen, thus forming the crosstalk screen P10.

[0021] The mechanism of the crosstalk image P10 is as follows: when the crosstalk image P10 is displayed, the grayscale voltage of the large display area is greatly converted, resulting in an instantaneous increase in the power supply of the source driver circuit 300, that is, the analog power supply voltage AVDD. If the impedance of the wiring that transmits the analog power supply voltage AVDD between the output end of the power management circuit 200 and the input end of the source driver circuit 300 is large, the voltage drop increases accordingly.

[0022] If the voltage drop is greater than the voltage difference between the analog power supply voltage AVDD connected to the source driving circuit 300 and the first gamma voltage GMA1, the voltage of the data signal DS output by the source driving circuit 300 will drop, resulting in a crosstalk screen P10. Figure 2As shown, when crosstalk occurs at the position of the data line DL in the grayscale L127 area, the analog power supply voltage AVDD drops, causing the gamma voltage GMA generated based on the analog power supply voltage AVDD in the source driver circuit 300 to drop synchronously, thereby causing the voltage of the corresponding data signal DS to also drop, resulting in the brightness at the corresponding horizontal line being darker than other positions.

[0023] The source driving circuit 300 may generate a plurality of gamma voltages based on the analog power supply voltage AVDD, and the first gamma voltage is the highest one among the plurality of gamma voltages.

[0024] In order to improve the above crosstalk, the relevant technologies used are as follows:

[0025] 1. Add mounting capacitors to the traces that transmit the analog power supply voltage AVDD. This method will increase the cost of materials such as capacitors, increase the area of ​​the printed circuit board (PCB), and the effect is not obvious.

[0026] 2. Increase the thrust of the source driving circuit 300. This method will increase the panel power consumption and increase the heat generated by the source driving circuit 300.

[0027] 3. Increase the voltage difference between the analog power supply voltage AVDD and GMA1. This method will increase power consumption and increase the heat generated by the inductor in the DC conversion (DCDC) circuit.

[0028] Based on the above analysis, it can be seen that although the above method improves the crosstalk image P10, it will also bring about some of the above-mentioned negative effects.

[0029] This embodiment provides a display device. Figures 3 to 5 ,like Figure 3 As shown, the display device includes a timing controller 100, a power management circuit 200 and a source driving circuit 300. The timing controller 100 is configured to receive image data DIN to be displayed, and determine whether the image data DIN includes a crosstalk picture P10, and issue a voltage modification instruction CMD1 when the image data DIN includes the crosstalk picture P10; the power management circuit 200 is connected to the timing controller 100, and the power management circuit 200 is configured to increase the output analog power supply voltage AVDD according to the voltage modification instruction CMD1; the source driving circuit 300 is connected to the power management circuit 200, and the source driving circuit 300 is configured to output a corresponding data signal DS according to the analog power supply voltage AVDD.

[0030] It can be understood that the display device provided in this embodiment receives the image data DIN to be displayed through the timing controller 100, and determines whether the image data DIN includes the crosstalk picture P10, and issues a voltage modification instruction CMD1 when the image data DIN includes the crosstalk picture P10, and the power management circuit 200 increases the output analog power supply voltage AVDD according to the voltage modification instruction CMD1, and the source driving circuit 300 outputs the corresponding data signal DS according to the analog power supply voltage AVDD. When the crosstalk picture P10 is displayed, the analog power supply voltage AVDD connected to the source driving circuit 300 can be increased, and the decrease amplitude of the gamma voltage is reduced, thereby reducing the decrease amplitude of the data signal DS, thereby improving the crosstalk picture P10 by modifying parameters without increasing the hardware cost, and thus reducing the negative effects when improving the crosstalk picture P10.

[0031] It should be noted that, in the crosstalk picture P10, the second area P12 may be, but is not limited to, surrounding the first area P11, and the first area P11 may also be connected to the second area P12. The timing controller 100 may receive the image data DIN to be displayed, and determine whether the image data DIN includes the crosstalk picture P10 according to the picture detection function, namely PDF, and whether the image data DIN includes the crosstalk picture P10.

[0032] The display device may be an electronic device with a heavy in-plane load such as a notebook computer or a tablet computer. The power management circuit 200 may be a printed circuit board or a power management chip (PMIC). The source driver circuit 300 may be a printed circuit board or a source driver chip.

[0033] In some embodiments, such as Figure 4 As shown, the display device further includes a display panel 400 connected to the source driving circuit 300. The display panel 400 includes sub-pixels distributed in an array, and the sub-pixels have corresponding numbers of columns and rows.

[0034] In some embodiments, such as Figure 4 As shown, the power management circuit 200 includes a register 201 , and the register 201 stores voltage data. The voltage data can play a role in adjusting the analog power supply voltage AVDD in the power management circuit 200 .

[0035] In some embodiments, such as Figure 5 As shown, the crosstalk picture P10 includes a first area P11 and a second area P12, and the difference in grayscale numbers between the first area P11 and the second area P12 is greater than preset data.

[0036] It should be noted that the difference in grayscale numbers is the difference between the grayscale of the first area P11 and the grayscale of the second area P12. The grayscale of the first area P11 can be the average value of all grayscales in the first area P11, or the grayscales in the first area P11 are all equal; the grayscale of the second area P12 can be the average value of all grayscales in the second area P12, or the grayscales in the second area P12 are all equal.

[0037] The preset data may be greater than or equal to 48. If the preset data is too small, the crosstalk picture P10 may not be formed. The larger the preset data, the higher the accuracy of judging the crosstalk picture P10. For example, the grayscale of the first area P11 may be L0 or L255, and the grayscale of the second area P12 may be L127. The difference in grayscale number may be 127 or 128, both of which are greater than 48.

[0038] In some embodiments, the grayscale variation of the sub-pixel corresponding to the first region P11 is greater than the preset grayscale, and the grayscale variation is the difference between the grayscale of the sub-pixel in the crosstalk image P10 and the grayscale of the sub-pixel in the previous frame.

[0039] It should be noted that the preset grayscale can be greater than or equal to L30. The grayscale of the sub-pixel corresponding to the first area P11 in the previous frame is exemplarily L0 or L255, and the grayscale of the sub-pixel corresponding to the first area P11 in the current frame is L127, then the grayscale change of the sub-pixel corresponding to the first area P11 is L127 or L128. The preset grayscale is used to determine whether the grayscale corresponding to the sub-pixel in the first area P11 has jumped. If the preset grayscale is too small, the accuracy of the grayscale jump will be reduced; if the preset grayscale is too large, some grayscale jumps will be easily missed, which will affect the accuracy of the judgment of the crosstalk picture P10.

[0040] In some embodiments, the number of columns of sub-pixels corresponding to the first area P11 is a first number of columns, the number of columns of sub-pixels corresponding to the second area P12 is a second number of columns, the ratio of the first number of columns to the third number of columns is greater than or equal to a preset ratio, and the third number of columns is the sum of the first number of columns and the second number of columns.

[0041] It should be noted that the third number of columns may be the total number of columns of sub-pixels in the display panel 400. The preset ratio may be 1 / 3.

[0042] In some embodiments, the working phase of the display device includes a display phase for displaying image data DIN and a blank phase between the display phases, and the power management circuit 200 is configured to increase the output analog power voltage AVDD in the blank phase according to the voltage modification instruction CMD1.

[0043] It should be noted that the display phase may display a corresponding picture according to the image data DIN. The blank phase is when no corresponding picture is displayed according to the image data DIN. The display phase and the blank phase may appear alternately.

[0044] In some embodiments, such as Figure 3 , Figure 4 As shown, the power management circuit 200 is configured to adjust the voltage data according to the voltage modification instruction CMD1 to increase the analog power supply voltage AVDD.

[0045] It should be noted that each voltage data may correspond to an analog power supply voltage AVDD, and when the voltage data changes, the analog power supply voltage AVDD also changes accordingly.

[0046] In some of the embodiments, the timing controller 100 is configured to issue a voltage recovery instruction CMD2 when identifying a picture other than the crosstalk picture P10 from the image data DIN, the power management circuit 200 is configured to restore the increased analog power supply voltage AVDD according to the voltage recovery instruction CMD2, and the source driver circuit 300 is configured to output a corresponding data signal DS according to the restored analog power supply voltage AVDD.

[0047] It should be noted that the pictures other than the crosstalk picture P10 can be regarded as normal pictures. At this time, the increased analog power supply voltage AVDD is reduced to the level before the increase. The present application only increases the analog power supply voltage AVDD in the case of the crosstalk picture P10. Compared with increasing the thrust of the source driving circuit 300 or the voltage difference between the analog power supply voltage AVDD and GMA1, which requires continuously increasing power consumption, power consumption can be reduced.

[0048] like Figure 5 As shown, when crosstalk occurs at the position of the data line DL in the grayscale L127 area, since the analog power supply voltage AVDD is increased, even if there is a drop, it only drops to the level before the increase. This prevents the gamma voltage GMA generated based on the analog power supply voltage AVDD in the source driver circuit 300 from synchronously dropping, and the voltage of the corresponding data signal DS can also remain stable, thereby improving the crosstalk screen P10.

[0049] In some embodiments, the present embodiment provides a display driving method, such as Figure 6 As shown, the display driving method includes the following steps:

[0050] Step S10: When the timing controller identifies the crosstalk picture P10 from the image data, it issues a voltage modification instruction.

[0051] Step S20: the power management circuit increases the output analog power voltage according to the voltage modification instruction.

[0052] Step S30: the source driving circuit outputs a corresponding data signal according to the analog power supply voltage.

[0053] It can be understood that the display driving method provided in the present embodiment receives the image data DIN to be displayed through the timing controller 100, and determines whether the image data DIN includes the crosstalk picture P10, and issues a voltage modification instruction CMD1 when the image data DIN includes the crosstalk picture P10, and the power management circuit 200 increases the output analog power supply voltage AVDD according to the voltage modification instruction CMD1, and the source driving circuit 300 outputs the corresponding data signal DS according to the analog power supply voltage AVDD. When the crosstalk picture P10 is displayed, the analog power supply voltage AVDD connected to the source driving circuit 300 can be increased, and the decrease amplitude of the gamma voltage is reduced, thereby reducing the decrease amplitude of the data signal DS, thereby improving the crosstalk picture P10 by means of parameter modification, and there is no need to increase the hardware cost, thereby being able to reduce the negative effects when improving the crosstalk picture P10.

[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] The display device and display driving method provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, characterized in that: The display device comprises: a timing controller configured to receive image data to be displayed, determine whether the image data includes a crosstalk picture, and issue a voltage modification instruction when the image data includes the crosstalk picture; A power management circuit, the power management circuit is connected to the timing controller, and the power management circuit is configured to increase the output analog power voltage according to the voltage modification instruction; A source driving circuit is connected to the power management circuit, and the source driving circuit is configured to output a corresponding data signal according to the analog power supply voltage.

2. The display device according to claim 1, characterized in that The crosstalk image includes a first area and a second area, and a difference in grayscale numbers between the first area and the second area is greater than preset data.

3. The display device according to claim 2, characterized in that: The display device comprises a display panel connected to the source driving circuit, and the display panel comprises sub-pixels distributed in an array; The grayscale variation amount corresponding to the sub-pixel in the first area is greater than a preset grayscale, and the grayscale variation amount is a difference between the grayscale of the sub-pixel in the crosstalk picture and the grayscale of the sub-pixel in the previous frame picture.

4. The display device according to claim 3, characterized in that: The number of columns of the sub-pixels corresponding to the first area is a first number of columns, the number of columns of the sub-pixels corresponding to the second area is a second number of columns, the ratio of the first number of columns to the third number of columns is greater than or equal to a preset ratio, and the third number of columns is the sum of the first number of columns and the second number of columns.

5. The display device according to claim 2, characterized in that: The second area surrounds the first area.

6. The display device according to claim 1, characterized in that: The working phase of the display device includes a display phase and a blank phase between the display phases, and the power management circuit is configured to increase the output analog power voltage in the blank phase according to the voltage modification instruction.

7. The display device according to claim 1, characterized in that: The power management circuit includes a register storing voltage data, and the power management circuit is configured to adjust the voltage data according to the voltage modification instruction to increase the analog power supply voltage.

8. The display device according to any one of claims 1 to 7, characterized in that: The timing controller is configured to issue a voltage recovery instruction when identifying a picture other than the crosstalk picture from the image data, the power management circuit is configured to restore the increased analog power supply voltage according to the voltage recovery instruction, and the source driver circuit is configured to output a corresponding data signal according to the restored analog power supply voltage.

9. A display driving method, characterized in that: The display driving method comprises: The timing controller receives image data to be displayed, determines whether the image data includes a crosstalk picture, and issues a voltage modification instruction when the image data includes the crosstalk picture; The power management circuit increases the output analog power voltage according to the voltage modification instruction; The source driving circuit outputs a corresponding data signal according to the analog power supply voltage.

10. The display driving method according to claim 9, characterized in that: The display driving method further includes: The timing controller issues a voltage recovery instruction when identifying a picture other than the crosstalk picture from the image data; The power management circuit restores the increased analog power supply voltage according to the voltage recovery instruction; The source driving circuit outputs a corresponding data signal according to the restored analog power supply voltage.

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