CN117496912A - Novel display driving method - Google Patents
Novel display driving method Download PDFInfo
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- CN117496912A CN117496912A CN202311470262.XA CN202311470262A CN117496912A CN 117496912 A CN117496912 A CN 117496912A CN 202311470262 A CN202311470262 A CN 202311470262A CN 117496912 A CN117496912 A CN 117496912A
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- display
- vcom
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- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000010009 beating Methods 0.000 claims abstract description 7
- 241001270131 Agaricus moelleri Species 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
Abstract
The invention provides a novel display driving method, which comprises the following steps: s1, respectively dividing a TP touch electrode plate and a display panel into a plurality of TP touch electrode plate units and display areas; s2, detecting a display image of the display area; s3, if the bright image is judged to be displayed, writing-1.7V VCOM voltage into the TP touch electrode plate unit in the Dp period of the FrameN; in the TP period of Frame N, the Tx detection signal is applied to the VCOM voltage; writing VCOM voltage of +0.3V into the TP touch electrode plate unit in the Dp period of Frame N+1; in the Tp period of Frame N+1, simultaneously beating Tx detection signals to VCOM voltage; s4, if the display of the dark image is judged, writing-0.7V VCOM voltage into the TP touch electrode plate unit in Dp periods of Frame N and Frame N+1; in TP periods of FrameN and FrameN+1, tx detection signals are applied to VCOM voltage. The VCOM voltages of the TP touch polar plate units corresponding to different display areas are controlled to increase the brightness difference of the different display areas, so that the purposes of increasing the contrast of a screen and optimizing the display effect are achieved.
Description
Technical Field
The invention relates to the technical field of display screen driving, in particular to a novel display driving method.
Background
Along with the improvement of the demand of people for the display effect of the screen, the development trend of the screen tends to develop with high refresh rate, high resolution and high contrast. An LCD display includes a Backlight (Backlight), a TFT substrate (TFT Glass), a Liquid Crystal panel (Liquid Crystal), a touch panel (TP Sensor), color filter Glass (ColorFilter Glass), cover Glass (cover lens), and the like.
In the conventional LCD driving mode, in the Display and touch periods, when a brighter image is displayed (e.g., (1) area in fig. 1 shows white), in the Display Period (Display Period abbreviated as Dp), the whole TP Sensor receives a voltage that is constant from the VCOM voltage given by the IC and does not change with the brightness of the image in the Display area, for example, vcom= -0.7V, so that no matter how the image is displayed, the VCOM voltage is always equal to-0.7V and does not change, and the Pixel voltage of the Pixel electrode on the TFT substrate is +5v, and the VCOM received by the TP Sensor is in the Dp Period in fig. 2. In the Touch Period (Tp), each Tp Sensor receives a Touch detection signal (Tx) from the IC row by row, and the VCOM waveform received by the Tp Sensor is shown in the Tp Period of fig. 2.
When a darker image is displayed (e.g., black is displayed in the area (2) in fig. 1), the VCOM voltage is always equal to-0.7V without change in the display period, and the VCOM received by the TP Sensor is as in the Dp period of fig. 3. In the touch period (touch period is abbreviated as Tp), each Tp Sensor receives a touch detection signal (Tx) from the IC row by row, and the VCOM waveform received by the Tp Sensor is shown as Tp period in fig. 3.
As described above, in the conventional LCD panel display period, the VCOM voltage across the entire TP Sensor is a constant voltage and does not vary with the brightness of the display area image, resulting in insufficient brightness of the black screen and lower panel contrast than the OLED panel.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel display driving method which can increase the contrast of a screen and optimize the display effect.
The invention is realized in the following way:
the invention provides a novel display driving method, which comprises the following steps:
s1, dividing a TP touch electrode plate into a plurality of TP touch electrode plate units, dividing a display panel into a plurality of display areas according to the number of the TP touch electrode plate units, wherein each display area corresponds to one TP touch electrode plate unit;
s2, according to the display image required by each display area, the IC detects and judges the average gray scale to be displayed in each display area, and the display image of each display area is determined to be a brighter image or a darker image according to the average gray scale;
s3, if a certain display area is judged to display a brighter image, writing a Pixel voltage of +5V and a VCOM voltage of-1.7V into the corresponding TP touch electrode plate unit in the Dp period of Frame N;
maintaining the VCOM level of the Frame N in the Dp period in the TP period of the Frame N, and simultaneously beating Tx detection signals to the Pixel voltage and the VCOM voltage on the basis of the VCOM level;
writing-5V Pixel voltage and +0.3V VCOM voltage into the corresponding TP touch electrode plate unit in Dp period of Frame N+1;
in the Tp period of the Frame N+1, maintaining the VCOM level of the Frame N+1 in the Dp period, and simultaneously beating Tx detection signals on the Pixel voltage and the VCOM voltage on the basis of the VCOM level;
s4, if a certain display area is judged to display a darker image, writing a Pixel voltage of 0V and a VCOM voltage of-0.7V into the corresponding TP touch electrode plate units in the Dp period of FrameN and FrameN+1;
in TP period of Frame N and Frame N+1, VCOM level of Frame N and Frame N+1 in Dp period is maintained, and Tx detection signal is applied to Pixel voltage and VCOM voltage simultaneously based on the level.
Further, in the step S2, if the average gray scale of a certain display area is greater than 127 gray scales, it is determined that the display area needs to display a brighter pattern;
if the average gray scale of a certain display area is less than 30 gray, the display area is judged to need to display darker patterns.
The invention has the advantages that: the VCOM voltages of the TP touch polar plate units corresponding to different display areas are controlled to increase the brightness difference of the different display areas, so that the purposes of increasing the contrast of a screen and optimizing the display effect are achieved.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a display image of different regions.
Fig. 2 is a waveform diagram of VCOM received from an IC by a TP Sensor when displaying a brighter pattern in the prior art.
Fig. 3 is a waveform diagram of VCOM received from an IC by a TP Sensor when displaying a darker pattern in the prior art.
Fig. 4 is a schematic diagram illustrating the division of the TP touch pad of the present invention.
FIG. 5 is a schematic diagram of an LCD display according to the present invention partitioned by TP touch pad units.
Fig. 6 is a waveform chart of VCOM received from IC by TP Sensor when the display area of the invention displays a brighter pattern.
Fig. 7 is a waveform diagram of VCOM received from IC by TP Sensor when the display area of the invention displays darker pattern.
Detailed Description
The general idea of the invention is as follows: the TP touch pad is divided into a plurality of TP touch pad units, and according to the number of TP touch pad units, the display panel is divided into a plurality of display areas, each display area corresponds to one TP touch pad unit, for example, is divided into 40 x60=2400 display areas, and in the case of a 2.5K screen, 1700×rgb sub-pixels are provided in each display area. When the display area needs to display a brighter image (for example, the area (1) of fig. 1 displays white), the TP touch pad unit of the display area applies a dynamically changing VCOM voltage to increase the brightness of the display area. In contrast, when the display area needs to display a darker image (such as black in the area (2) of fig. 1), the TP touch pad unit of the display area applies a static VCOM voltage to reduce the brightness of the display area. The larger the brightness difference between the adjacent display areas, the higher the display contrast of the panel, and the better the display effect.
Referring to fig. 4 to 7, the present invention provides a novel display driving method, which includes the following steps:
s1, dividing a TP touch electrode plate into a plurality of TP touch electrode plate units 1, dividing a display panel into a plurality of display areas according to the number of the TP touch electrode plate units, wherein each display area corresponds to one TP touch electrode plate unit;
s2, according to the display image required by each display area, the IC detects and judges the average gray scale to be displayed in each display area, and the display image of each display area is determined to be a brighter image or a darker image according to the average gray scale;
s3, if a certain display area is judged to display a brighter image, writing a Pixel voltage of +5V and a VCOM voltage of-1.7V into the corresponding TP touch electrode plate unit in the Dp period of Frame N;
maintaining the VCOM level of the Frame N in the Dp period in the TP period of the Frame N, and simultaneously beating Tx detection signals to the Pixel voltage and the VCOM voltage on the basis of the VCOM level;
writing-5V Pixel voltage and +0.3V VCOM voltage into the corresponding TP touch electrode plate unit in Dp period of Frame N+1;
in the Tp period of the Frame N+1, maintaining the VCOM level of the Frame N+1 in the Dp period, and simultaneously beating Tx detection signals on the Pixel voltage and the VCOM voltage on the basis of the VCOM level;
s4, if a certain display area is judged to display a darker image, writing a Pixel voltage of 0V and a VCOM voltage of-0.7V into the corresponding TP touch electrode plate units in the Dp period of FrameN and FrameN+1;
in TP period of Frame N and Frame N+1, VCOM level of Frame N and Frame N+1 in Dp period is maintained, and Tx detection signal is applied to Pixel voltage and VCOM voltage simultaneously based on the level.
Specifically, in the step S2, if the average gray scale of a certain display area is greater than 127 gray scales, it is determined that the display area needs to display a brighter pattern;
if the average gray scale of a certain display area is less than 30 gray, the display area is judged to need to display darker patterns. Taking a 2.5K screen as an example, dividing the screen into 40x60 display areas, and judging that a display area is a brighter image to be displayed when the average gray level of the image to be displayed in the display area is greater than 127 gray levels (namely 1700RGB sub-pixel average gray level is greater than 127 gray levels); when the average gray scale of the image to be displayed in a certain display area is smaller than 30 gray, the display area is judged to be required to display a darker image (namely 1700RGB sub-pixel average gray scale <30 gray).
One specific application of the invention is:
when the image shown in fig. 1 needs to be displayed, a brighter image (for example, white is displayed) needs to be displayed in the (1) region, and in the Dp period of Frame N, the Pixel voltage in the (1) region is +5v, so that in order to increase the brightness of the (1) region, the VCOM voltage received by the TP touch pad unit corresponding to the (1) region may be reduced (the VCOM voltage is reduced from-0.7V to-1.7V in the prior art), so that the Pixel voltage in the (1) region and the TP touch pad unit in the (1) region have a larger voltage difference (the larger the voltage difference between the Pixel voltage and the corresponding TP touch pad unit under the same backlight source is, the higher the brightness of the region is).
In the prior art, when the LCD driving method is used to display the image of fig. 1, the voltage difference between the (1) area Pixel voltage and the VCOM voltage received by the (1) area TP touch pad unit is Pixel voltage-vcom=5v—0.7v=5.7v. The voltage difference in the application is Pixel voltage-VCOM=5V-1.7V=6.7V; it is known that the driving method of the present application is superior to the prior art method when a brighter image needs to be displayed under the same backlight.
When a darker image needs to be displayed (for example, black is displayed), as in the region (2) of fig. 1, the TP touch pad unit in the region (2) maintains the optimal VCOM unchanged (vcom= -0.7V) as in the driving method in the prior art, so as to obtain lower brightness.
Next, in the Tp period of Frame N (this period is used for touch detection), the Tp touch pad units in different areas need to receive the Tx detection signal from the IC, and compared with the driving method in the prior art, the Tp touch pad units in different areas need to maintain the VCOM level of the display period, and to beat the Tx detection signal on the level (for example, (1) the VCOM waveform in the area is as in the Tp period of fig. 6, and (2) the VCOM waveform in the area is as in the Tp period of fig. 7). Referring to FIG. 6, when the next frame, i.e., frameN+1, the Pixel voltage polarity is inverted +5V→5V (the Pixel voltage polarity inversion is to prevent the phenomenon of the liquid crystal polarization induced ghost), the VCOM voltage is from-1.7V→ +0.3V.
At this time, the differential pressure between the Pixel voltage in the area (1) and the VCOM voltage received by the TP touch polar plate unit in the area (1) is-5V-0.3 V= -5.3V; in the prior art, the differential pressure is-5V-0.7v= -4.3V, and it is known that in the driving mode of the present application, no matter the area (1) is a positive frame or a negative frame, the differential pressure between the Pixel voltage and the VCOM voltage received by the TP touch pad unit in the area is higher than that in the driving mode of the prior art, that is, the brightness is higher than that in the conventional driving mode.
Meanwhile, the driving mode of the application does not increase the differential pressure between pixels and VCOM of positive frames and negative frames, taking white pictures as an example,
pixel and VCOM voltage difference positive and negative frame contrast:
in this application: positive frame: |pixel-vcom|= |5V- (-1.7V) |=6.7v, negative frame: |pixel-vcom|= | -5V- (0.3V) |=5.3V; the Pixel and VCOM voltage differences for the positive and negative frames were 1.4V.
The driving mode of the prior art is as follows: positive frame: |pixel-vcom|= |5V- (-0.7V) |=5.7V, negative frame: |pixel-vcom|= | -5V- (-0.7V) |=4.3V; the Pixel and VCOM voltage differences for the positive and negative frames were also 1.4V.
By contrast, the driving mode of the display device can not increase the differential pressure between pixels and VCOM of positive frames and negative frames, namely, the brightness difference between the positive frames and the negative frames can not be increased, so that the problem of screen flashing is caused.
The method and the device solve the problem of low contrast ratio of the traditional LCD screen, and achieve the purpose of increasing the contrast ratio of the screen and optimizing the display effect by controlling VCOM voltages of TP sensors corresponding to different display areas to increase brightness differences of different display areas.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (2)
1. A novel display driving method is characterized in that: the method comprises the following steps:
s1, dividing a TP touch electrode plate into a plurality of TP touch electrode plate units, dividing a display panel into a plurality of display areas according to the number of the TP touch electrode plate units, wherein each display area corresponds to one TP touch electrode plate unit;
s2, according to the display image required by each display area, the IC detects and judges the average gray scale to be displayed in each display area, and the display image of each display area is determined to be a brighter image or a darker image according to the average gray scale;
s3, if a certain display area is judged to display a brighter image, writing a Pixel voltage of +5V and a VCOM voltage of-1.7V into the corresponding TP touch electrode plate unit in the Dp period of Frame N;
maintaining the VCOM level of the Frame N in the Dp period in the TP period of the Frame N, and simultaneously beating Tx detection signals to the Pixel voltage and the VCOM voltage on the basis of the VCOM level;
writing-5V Pixel voltage and +0.3V VCOM voltage into the corresponding TP touch electrode plate unit in Dp period of Frame N+1;
in the Tp period of the Frame N+1, maintaining the VCOM level of the Frame N+1 in the Dp period, and simultaneously beating Tx detection signals on the Pixel voltage and the VCOM voltage on the basis of the VCOM level;
s4, if a certain display area is judged to display a darker image, writing a Pixel voltage of 0V and a VCOM voltage of-0.7V into the corresponding TP touch electrode plate units in the Dp period of FrameN and FrameN+1;
in TP period of Frame N and Frame N+1, VCOM level of Frame N and Frame N+1 in Dp period is maintained, and Tx detection signal is applied to Pixel voltage and VCOM voltage simultaneously based on the level.
2. A novel display driving method as claimed in claim 1, wherein: in the step S2, if the average gray scale of a certain display area is greater than 127 gray scales, it is determined that the display area needs to display a brighter pattern; if the average gray scale of a certain display area is less than 30 gray, the display area is judged to need to display darker patterns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311470262.XA CN117496912A (en) | 2023-11-07 | 2023-11-07 | Novel display driving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311470262.XA CN117496912A (en) | 2023-11-07 | 2023-11-07 | Novel display driving method |
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| Publication Number | Publication Date |
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| CN117496912A true CN117496912A (en) | 2024-02-02 |
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| CN202311470262.XA Pending CN117496912A (en) | 2023-11-07 | 2023-11-07 | Novel display driving method |
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| CN (1) | CN117496912A (en) |
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