A new display driving method

Abstract

The present invention provides a novel display driving method, comprising: S1, dividing a TP touch plate and a display panel into a plurality of TP touch plate units and a display area, respectively; S2, detecting a display image in the display area; S3, if it is determined that a brighter image is displayed, writing a VCOM voltage of -1.7V to the TP touch plate unit during the Dp period of Frame N; generating a Tx detection signal for the VCOM voltage during the TP period of Frame N; writing a +0.3V VCOM voltage to the TP touch plate unit during the Dp period of Frame N+1; and generating a Tx detection signal for the VCOM voltage during the Tp period of Frame N+1; S4, if it is determined that a darker image is displayed, writing a VCOM voltage of -0.7V to the TP touch plate unit during the Dp periods of Frame N and Frame N+1; and generating a Tx detection signal for the VCOM voltage during the TP periods of Frame N and Frame N+1. By controlling the VCOM voltage of the TP touch panel unit corresponding to different display areas, the brightness difference of different display areas is increased to achieve the purpose of increasing the screen contrast and optimizing the display effect.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen driving, and in particular to a novel display driving method. Background Art

[0002] As people's demand for screen display quality increases, the development trend of screens is tending towards high refresh rate, high resolution, and high contrast. An LCD display includes a backlight, TFT substrate (TFT glass), liquid crystal panel (Liquid Crystal), touch panel (TP sensor), color filter glass (Color Filter Glass), cover glass (Cover Lens), etc.

[0003] In the existing LCD driving mode, the TP Sensor (TP touch panel) is in the display and touch period, when a brighter image (such as Figure 1 In the display period (Dp), the VCOM voltage received by the entire TPSensor from the IC is a constant voltage and does not change with the brightness of the image in the display area. For example, if VCOM = -0.7V, then no matter what image is displayed, the VCOM voltage is always equal to -0.7V and does not change. The pixel voltage of the pixel electrode on the TFT substrate is +5V. At this time, the VCOM received by the TP Sensor is as follows: Figure 2 During the touch period (Tp), each TP Sensor receives the touch detection signal (Tx) from the IC row by row. The VCOM waveform received by the TP Sensor is as follows: Figure 2 Tp period.

[0004] When displaying darker images (such as Figure 1 The area ② in the figure is displayed in black. During the display period, the VCOM voltage is always equal to -0.7V and does not change. At this time, the VCOM received by the TP Sensor is as follows: Figure 3 During the touch period (TouchPeriod, abbreviated as Tp), each TP Sensor receives the touch detection signal (Tx) from the IC row by row. At this time, the VCOM waveform received by the TPSensor is as follows: Figure 3 Tp period.

[0005] As mentioned above, during the display period of a traditional LCD panel, the VCOM voltage on the entire TP sensor is a constant voltage and does not change with the brightness of the image in the display area. This causes the black screen to be not dark enough, resulting in a lower panel contrast than an OLED panel. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a new display driving method that can increase screen contrast and optimize display effects.

[0007] The present invention is achieved in that:

[0008] The present invention provides a novel display driving method, comprising the following steps:

[0009] S1, dividing the TP touch pad into a plurality of TP touch pad units, and dividing the display panel into a plurality of display areas according to the number of the TP touch pad units, each display area corresponding to a TP touch pad unit;

[0010] S2. Based on the display image required by each display area, the IC detects and determines the average grayscale to be displayed in each display area, and determines whether the display image in each display area is a brighter image or a darker image based on the average grayscale;

[0011] S3. If a display area is determined to display a brighter image, a +5V pixel voltage and a -1.7V VCOM voltage are written to the corresponding TP touch panel unit during the Dp period of Frame N.

[0012] During the TP period of Frame N, the VCOM level of Frame N during the Dp period is maintained, and based on this level, Tx detection signals are simultaneously issued for the pixel voltage and VCOM voltage.

[0013] During the Dp period of Frame N+1, a -5V pixel voltage and a +0.3V VCOM voltage are written to the corresponding TP touch pad unit.

[0014] During the Tp period of Frame N+1, the VCOM level of Frame N+1 during the Dp period is maintained, and based on this level, a Tx detection signal is simultaneously issued for both the pixel voltage and the VCOM voltage.

[0015] S4. If a display area is determined to display a darker image, a pixel voltage of 0V and a VCOM voltage of -0.7V are written to the corresponding TP touch panel unit during the Dp period of Frame N and Frame N+1.

[0016] During the TP period of Frame N and Frame N+1, the VCOM level of Frame N and Frame N+1 during the Dp period is maintained, and Tx detection signals are simultaneously issued to the pixel voltage and VCOM voltage based on this level.

[0017] Furthermore, in step S2, if the average grayscale of a certain display area is greater than 127 grays, it is determined that the display area needs to display a brighter pattern;

[0018] If the average grayscale of a certain display area is less than 30 grays, it is determined that the display area needs to display a darker pattern.

[0019] The advantages of the present invention are that the brightness difference of different display areas is increased by controlling the VCOM voltage of the TP touch plate unit corresponding to different display areas, thereby achieving the purpose of increasing the screen contrast and optimizing the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 Schematic diagram showing images for different regions.

[0022] Figure 2 This is a VCOM waveform diagram received by the TP Sensor from the IC when a brighter pattern is displayed in the prior art.

[0023] Figure 3 FIG. 1 is a VCOM waveform diagram received by the TP Sensor from the IC when a darker pattern is displayed in the prior art.

[0024] Figure 4 Schematic diagram of the segmentation of the TP touch panel of the present invention.

[0025] Figure 5 This is a schematic diagram of the LCD display of the present invention being divided into zones according to the TP touch panel units.

[0026] Figure 6 This is a VCOM waveform diagram received by the TP Sensor from the IC when the display area of ​​the present invention displays a brighter pattern.

[0027] Figure 7 This is a VCOM waveform diagram received by the TP Sensor from the IC when the display area of ​​the present invention displays a darker pattern. DETAILED DESCRIPTION

[0028] The overall idea of ​​the present invention is to divide the TP touch panel into a plurality of TP touch panel units, and according to the number of TP touch panel units, divide the display panel into a plurality of display areas, each display area corresponds to a TP touch panel unit, for example, divided into 40x60=2400 display areas, taking a 2.5K screen as an example, each display area has 1700*RGB sub-pixels. When the display area needs to display a brighter image (such as Figure 1The TP touch panel unit in this display area provides a dynamically changing VCOM voltage to increase the brightness of this display block. On the contrary, when this display area needs to display a darker image (such as Figure 1 (The ② area is displayed black). The TP touch panel unit in this display area is supplied with a static VCOM voltage to reduce the brightness of this display area. The greater the brightness difference between adjacent display areas, the higher the display contrast of the panel and the better the display effect.

[0029] See also Figures 4 to 7 The present invention provides a novel display driving method, comprising the following steps:

[0030] S1, dividing the TP touch pad into a plurality of TP touch pad units 1, and dividing the display panel into a plurality of display areas according to the number of the TP touch pad units, each display area corresponding to a TP touch pad unit;

[0031] S2. Based on the display image required by each display area, the IC detects and determines the average grayscale to be displayed in each display area, and determines whether the display image in each display area is a brighter image or a darker image based on the average grayscale;

[0032] S3. If a display area is determined to display a brighter image, a +5V pixel voltage and a -1.7V VCOM voltage are written to the corresponding TP touch panel unit during the Dp period of Frame N.

[0033] During the TP period of Frame N, the VCOM level of Frame N during the Dp period is maintained, and based on this level, Tx detection signals are simultaneously issued for the pixel voltage and VCOM voltage.

[0034] During the Dp period of Frame N+1, a -5V pixel voltage and a +0.3V VCOM voltage are written to the corresponding TP touch pad unit.

[0035] During the Tp period of Frame N+1, the VCOM level of Frame N+1 during the Dp period is maintained, and based on this level, a Tx detection signal is simultaneously issued for both the pixel voltage and the VCOM voltage.

[0036] S4. If a display area is determined to display a darker image, a pixel voltage of 0V and a VCOM voltage of -0.7V are written to the corresponding TP touch panel unit during the Dp period of Frame N and Frame N+1.

[0037] During the TP period of Frame N and Frame N+1, the VCOM level of Frame N and Frame N+1 during the Dp period is maintained, and Tx detection signals are simultaneously issued to the pixel voltage and VCOM voltage based on this level.

[0038] Specifically, in step S2, if the average grayscale of a certain display area is greater than 127 grays, it is determined that the display area needs to display a brighter pattern;

[0039] If the average grayscale of a display area is less than 30 grays, it is determined that the display area needs to display a darker pattern. Taking a 2.5K screen as an example, divided into 40x60 display areas, when the average grayscale of the image to be displayed in a display area is greater than 127 grays, this display area is determined to need to display a brighter image (i.e., the average grayscale of 1700 RGB sub-pixels is greater than 127 grays); and when the average grayscale of the image to be displayed in a display area is less than 30 grays, this display area is determined to need to display a darker image (i.e., the average grayscale of 1700 RGB sub-pixels is less than 30 grays).

[0040] A specific application of the present invention is:

[0041] When you need to display Figure 1 When the image is shown, area ① needs to display a brighter image (taking white as an example). During the Dp period of Frame N, the pixel voltage of area ① is +5V. In order to increase the brightness of area ①, the VCOM voltage received by the TP touch plate unit corresponding to area ① can be reduced (the VCOM voltage is reduced from -0.7V in the prior art to -1.7V), so that the pixel voltage in area ① and the TP touch plate unit in area ① have a larger voltage difference (under the same backlight source, the greater the voltage difference between the pixel voltage and the corresponding TP touch plate unit, the higher the brightness of this area).

[0042] The LCD driving method in the prior art also shows Figure 1 When displaying an image, the voltage difference between the pixel voltage in area ① and the VCOM voltage received by the touch panel unit in area ① is Pixel voltage - VCOM = 5V - 0.7V = 5.7V. However, the voltage difference in the present application is Pixel voltage - VCOM = 5V - 1.7V = 6.7V. It can be seen that when a brighter image needs to be displayed under the same backlight source, the driving method of the present application is superior to the method in the prior art.

[0043] When a darker image needs to be displayed (taking black as an example), Figure 1 In the ② area, the driving method of the present application is the same as that in the prior art. The TP touch plate unit in the ② area maintains the optimal VCOM unchanged (VCOM = -0.7V) to obtain a lower brightness.

[0044] Next, in the present application, during the Tp period of Frame N (this period is used for touch detection), the TP touch plate units in different areas need to receive the Tx detection signal from the IC. Compared with the driving method of the prior art group, the difference is that the TP touch plate units in different areas need to maintain the VCOM level during the display period and send the Tx detection signal at this level (for example, the VCOM waveform of area ① is as follows Figure 6 Tp period; the VCOM waveform in area ② is as follows Figure 7 Tp period). Figure 6 In the next frame, that is, FrameN+1, the pixel voltage polarity is reversed from +5V to -5V (the purpose of reversing the pixel voltage polarity is to prevent the liquid crystal polarization from causing the ghosting phenomenon). At this time, the VCOM voltage changes from -1.7V to +0.3V.

[0045] At this time, the voltage difference between the pixel voltage in area ① and the VCOM voltage received by the TP touch plate unit in area ① is -5V-0.3V=-5.3V in this application; the voltage difference in the prior art is -5V--0.7V=-4.3V. It can be seen that under the driving method of this application, regardless of the positive or negative frame, the voltage difference between the pixel voltage in area ① and the VCOM voltage received by the TP touch plate unit in this area is higher than the driving method in the prior art, that is, the brightness will be higher than the traditional driving method.

[0046] At the same time, the driving method of this application does not increase the voltage difference between the Pixel and VCOM in the positive frame and the negative frame. Taking the white screen as an example,

[0047] Comparison of the positive and negative voltage difference between Pixel and VCOM:

[0048] In this application: positive frame: |Pixel-VCOM|=|5V-(-1.7V)|=6.7V, negative frame: |Pixel-VCOM|=|-5V-(0.3V)|=5.3V; the voltage difference between the Pixel and VCOM voltages in the positive frame and the negative frame is 1.4V.

[0049] The driving method of the existing technology: positive frame: |Pixel-VCOM|=|5V-(-0.7V)|=5.7V, negative frame: |Pixel-VCOM|=|-5V-(-0.7V)|=4.3V; the voltage difference between Pixel and VCOM in positive frame and negative frame is also 1.4V.

[0050] By comparison, it can be seen that the driving method of the present application does not increase the voltage difference between the Pixel and VCOM of the positive frame and the negative frame, that is, it does not increase the brightness difference between the positive frame and the negative frame, thereby causing the problem of screen flickering.

[0051] This application improves the low contrast problem of traditional LCD screens by increasing the brightness difference of different display areas by controlling the VCOM voltage of the TPSensor corresponding to different display areas, thereby increasing the screen contrast and optimizing the display effect.

[0052] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A novel display driving method, characterized in that: The following steps are included: S1, dividing the TP touch pad into a plurality of TP touch pad units, and dividing the display panel into a plurality of display areas according to the number of the TP touch pad units, each display area corresponding to a TP touch pad unit; S2. Based on the display image required by each display area, the IC detects and determines the average grayscale to be displayed in each display area, and determines whether the display image in each display area is a brighter image or a darker image based on the average grayscale; S3. If a display area is determined to display a brighter image, a +5V pixel voltage and a -1.7V VCOM voltage are written to the corresponding TP touch panel unit during the Dp period of Frame N. During the TP period of Frame N, the VCOM level of Frame N during the Dp period is maintained, and based on this level, Tx detection signals are simultaneously issued for the pixel voltage and VCOM voltage. During the Dp period of Frame N+1, a -5V pixel voltage and a +0.3V VCOM voltage are written to the corresponding TP touch pad unit. During the Tp period of Frame N+1, the VCOM level of Frame N+1 during the Dp period is maintained, and based on this level, a Tx detection signal is simultaneously issued for both the pixel voltage and the VCOM voltage. S4. If a display area is determined to display a darker image, a pixel voltage of 0V and a VCOM voltage of -0.7V are written to the corresponding TP touch panel unit during the Dp period of Frame N and Frame N+1. During the TP period of Frame N and Frame N+1, the VCOM level of Frame N and Frame N+1 during the Dp period is maintained, and Tx detection signals are simultaneously issued to the pixel voltage and VCOM voltage based on this level.

2. A novel display driving method according to claim 1, characterized in that: In step S2, if the average grayscale of a display area is greater than 127 grays, it is determined that the display area needs to display a brighter pattern; if the average grayscale of a display area is less than 30 grays, it is determined that the display area needs to display a darker pattern.

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