CN111028804B - Demux driving method - Google Patents
Demux driving method Download PDFInfo
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- CN111028804B CN111028804B CN201911314515.8A CN201911314515A CN111028804B CN 111028804 B CN111028804 B CN 111028804B CN 201911314515 A CN201911314515 A CN 201911314515A CN 111028804 B CN111028804 B CN 111028804B
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
A Demux driving method comprises the following steps that in an enabling time domain of a grid driving line, a first Demux driving stage of a first sub-pixel, a first Demux driving stage of a second sub-pixel, a Demux driving stage of a third sub-pixel, a second Demux driving stage of the first sub-pixel and a second Demux driving stage of the second sub-pixel are divided, the first Demux driving stage of the first sub-pixel and the second Demux driving stage of the first sub-pixel are respectively arranged before and after the Demux driving stage of the third sub-pixel, and the first Demux driving stage of the second sub-pixel and the second Demux driving stage of the second sub-pixel are respectively arranged before and after the Demux driving stage of the third sub-pixel. Different from the prior art, the time domain of the third sub-pixel is arranged in the middle of secondary driving of other sub-pixels in the technical scheme, so that the third sub-pixel is ensured to have enough charging time, and the problem of insufficient charging of the sub-pixels is solved finally.
Description
Technical Field
The invention relates to the field of Demux driving, in particular to a design method of Demux driving.
Background
For an LCD screen, the charging rate of the Demux liquid crystal display screen is poor, especially the charging rate of the blue sub-pixel B is greatly reduced compared with the common charging rate, the display effect of the Demux liquid crystal display screen is influenced, and the scheme especially designs a problem of improving the charging rate of the sub-pixels aiming at the phenomenon.
Disclosure of Invention
Therefore, it is desirable to provide a new Demux specific timing sequence to avoid the color mixing problem.
In order to achieve the above object, the inventors provide a Demux driving method, which includes a step of dividing, in an enable time domain of a gate driving line, into an initial Demux driving stage of a first subpixel, an initial Demux driving stage of a second subpixel, a Demux driving stage of a third subpixel, a second Demux driving stage of the first subpixel, and a second Demux driving stage of the second subpixel, where the initial Demux driving stage of the first subpixel and the second Demux driving stage of the first subpixel are respectively located before and after the Demux driving stage of the third subpixel, and the initial Demux driving stage of the second subpixel and the second Demux driving stage of the second subpixel are respectively located before and after the Demux driving stage of the third subpixel.
Specifically, in an enabling time domain of the gate driving line, the first Demux driving of the first sub-pixel, the first Demux driving of the second sub-pixel, the Demux driving of the third sub-pixel, the second Demux driving of the first sub-pixel, and the second Demux driving of the second sub-pixel are performed in sequence.
Specifically, in an enabling time domain of the gate driving line, the first Demux driving of the first sub-pixel, the first Demux driving of the second sub-pixel, the Demux driving of the third sub-pixel, the second Demux driving of the second sub-pixel, and the second Demux driving of the first sub-pixel are performed in sequence.
Further, the action time of the primary Demux driving signal of the first sub-pixel is equal to the action time of the secondary Demux driving signal of the first sub-pixel.
Further, the action time of the primary Demux driving signal of the second sub-pixel is equal to the action time of the secondary Demux driving signal of the second sub-pixel.
Further, the action time of the Demux driving signal of the third sub-pixel is twice of the action time of the first Demux driving signal of the first sub-pixel, or twice of the action time of the first Demux driving signal of the second sub-pixel.
Preferably, the third sub-pixel is a B pixel.
Different from the prior art, the time domain of the third sub-pixel is arranged in the middle of secondary driving of other sub-pixels in the technical scheme, so that the third sub-pixel is ensured to have enough charging time, and the problem of insufficient charging of the sub-pixels is solved finally.
Drawings
FIG. 1 is a timing diagram of a Demux according to an embodiment;
FIG. 2 is a timing diagram of Demux according to an embodiment.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, fig. 1 is a timing diagram of Demux, as shown in fig. 1, a falling edge of Demux _ R to a falling edge of Gate is a time for charging a Pixel electrode by a Data Line for transmitting Data of a sub-Pixel R in a Demux lcd panel, where the time is named as R-1, and for the R sub-Pixel, the charging time R-1 of the Pixel electrode by the Data Line is sufficient, so that the display brightness of the R sub-Pixel is not affected; the time from the falling edge of the Demux _ G to the falling edge of the Gate is the time from the Data Line for transmitting the Data of the sub-Pixel G in the plane of the Demux liquid crystal display panel to charge the Pixel electrode, wherein the time is named as G-1, and for the G sub-Pixel, the charging time G-1 of the Data Line for the Pixel electrode is enough, so the display brightness of the G sub-Pixel is not influenced; the time from the falling edge of Demux _ B to the falling edge of the Gate is the time from the Data Line for transmitting the Data of the sub-Pixel B in the Demux liquid crystal display panel to charge the Pixel electrode, wherein the time is named as B-1, for the B sub-Pixel, the charging time B-1 from the Data Line to the Pixel electrode is insufficient, the display brightness of the B sub-Pixel is reduced, the blue brightness is determined to be darker than R/G due to the property of the three primary colors R/G/B, and the B sub-Pixel is displayed to be darker under the condition that the charging rate is not sufficient; the display brightness of the B sub-pixels is reduced, so that the display effect of the whole display screen is also affected.
In view of the above problems, an example of Demux driving timing sequence shown in fig. 2 is also proposed in our scheme, specifically, the time for turning on one gate (the gate voltage is a high voltage, generally 15V) in fig. 2 and fig. 1 is the same, and in this embodiment, the preset start times of Demux R and Demux G are divided into two times of turning on. The charging principle of Demux is specifically explained here: for the Demux liquid crystal display screen, when Demux _ R/Demux _ G/Demux _ B is at a high level, a voltage signal transmitted from an IC is first transmitted to a Data Line in a plane, and the Data Line transmits the voltage signal to a parasitic capacitor and a Pixel electrode on the Data Line at the same time. When the Demux _ R/Demux _ G/Demux _ B is at a low level, only the Data Line is left to charge the Pixel, and the patent mainly improves the charging efficiency of the Data Line on the Pixel electrode.
Referring to fig. 2, the scheme of the present invention includes the following steps, in the enabling time domain of the gate driving line, i.e. the period of high level of gate in fig. 2. The domain is divided into an initial Demux driving stage of the first sub-pixel, an initial Demux driving stage of the second sub-pixel, a Demux driving stage of the third sub-pixel, a second Demux driving stage of the first sub-pixel, and a second Demux driving stage of the second sub-pixel, wherein the initial Demux driving stage of the first sub-pixel and the second Demux driving stage of the first sub-pixel are respectively arranged before and after the Demux driving stage of the third sub-pixel, and the initial Demux driving stage of the second sub-pixel and the second Demux driving stage of the second sub-pixel are respectively arranged before and after the Demux driving stage of the third sub-pixel. As can be seen from the figure, each phase comprises a light emission phase of the corresponding sub-pixel Demux driving signal, followed by a falling edge and low level phase, and then the driving of the next sub-pixel, which has the advantage of avoiding cross talk with each other.
The following description will be given by taking the first sub-pixel as an R pixel, the second sub-pixel as a G pixel, and the third sub-pixel as a B pixel as an example. The Demux _ R waveform is started twice, namely R sub-Pixel data are transmitted to a Pixel electrode twice, for Demux _ R, the R sub-Pixel data are transmitted to the Pixel in an R-1 time period for the first time, and as the R-1 charging time is longer, the charging rate can reach saturation, and the first R data transmission has no problem of insufficient charging rate;
when Demux _ R is closed (although Demux _ R is closed, the Data Line in the Demux liquid crystal display screen surface always charges the Pixel within R-1 time), Demux _ G is opened again, the same G sub-Pixel Data is also transmitted to the Pixel electrode twice, the G sub-Pixel Data is transmitted to the Pixel within G-1 time period for the first time, and the charging rate can reach the best due to the longer G-1 charging time, and the first G Data transmission has no problem of insufficient charging rate;
when Demux _ R and Demux _ G are turned off for the first time, Demux _ B starts to be turned on, B Data is transmitted to the Pixel electrode through the in-plane corresponding Data Line (only B Data is transmitted) within B-1 time, B-1 charging time in fig. 2 is much longer than B-1 charging time in fig. 1, so that B Data can be charged for a longer time, and the charging rate of B Data is also improved.
And secondly, after Demux _ B is closed (although Demux _ B is closed, Data Line in the Demux liquid crystal display screen always charges pixels within B-1 time), after first charging of Demux _ G is completed, Demux _ G starts to be started for the second time, and G Data starts to be transmitted for the second time within G-2 time. When the second Demux _ G is closed, the Demux _ R starts to be opened, the R data is charged for the second time in the R-2 time period, and since the R data is charged for the first time, the charging rate can be ensured to be saturated enough when the R data is charged for the second time. Therefore, the scheme ensures that the third sub-pixel can obtain a sufficient charging rate through a new Demux driving time sequence. The problems in the prior art are solved. Especially, when the third sub-pixel is a B pixel, the brightness of blue is darker than R/G, and the B sub-pixel is darker when the charging rate is insufficient; the display brightness of the B sub-pixels is reduced, so that the display effect of the whole display screen is also affected. By applying the technical scheme of the invention, the whole picture can be more saturated and gorgeous.
According to the scheme, the effect of expanding the charging time of the third sub-pixel can be achieved by splitting the driving time sequence of the first sub-pixel and the driving time sequence of the second sub-pixel before and after the driving time sequence of the second sub-pixel. However, there is no sequential limitation on the time for the first sub-pixel redriving time and the second sub-pixel redriving time. That is, the first Demux driving of the first subpixel, the first Demux driving of the second subpixel, the Demux driving of the third subpixel, the second Demux driving of the first subpixel, and the second Demux driving of the second subpixel may be sequentially performed in an enable time domain of the gate driving line. The method can also be arranged in an enabling time domain of the grid driving line, and the primary Demux driving of the first sub-pixel, the primary Demux driving of the second sub-pixel, the Demux driving of the third sub-pixel, the secondary Demux driving of the second sub-pixel and the secondary Demux driving of the first sub-pixel are sequentially carried out. The first sub-pixel and the second sub-pixel may be respectively set to R, G, or may be set to G, R in decibels. The problem of insufficient charging rate of the third sub-pixel can be solved.
In other specific embodiments, the first Demux driving signal of the first sub-pixel is applied for the same duration as the second Demux driving signal of the first sub-pixel. It can also be set that the acting time of the primary Demux driving signal of the second sub-pixel is equal to the acting time of the secondary Demux driving signal of the second sub-pixel. Meanwhile, the action time of the Demux driving signal of the third sub-pixel is twice of the action time of the initial Demux driving signal of the first sub-pixel, or twice of the action time of the initial Demux driving signal of the second sub-pixel. Through the scheme, the time between multiple times of driving charging can be better balanced, and the interference is avoided.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (7)
1. A Demux driving method is characterized by comprising the following steps of dividing an enabling time domain of single opening of a grid driving line into a primary Demux driving stage of a first sub-pixel, a primary Demux driving stage of a second sub-pixel, a Demux driving stage of a third sub-pixel, a secondary Demux driving stage of the first sub-pixel and a secondary Demux driving stage of the second sub-pixel, wherein the primary Demux driving stage of the first sub-pixel and the secondary Demux driving stage of the first sub-pixel are respectively arranged before and after the Demux driving stage of the third sub-pixel, and the primary Demux driving stage of the second sub-pixel and the secondary Demux driving stage of the second sub-pixel are respectively arranged before and after the Demux driving stage of the third sub-pixel.
2. The Demux driving method according to claim 1, wherein the first Demux driving of the first sub-pixel, the first Demux driving of the second sub-pixel, the Demux driving of the third sub-pixel, the second Demux driving of the first sub-pixel, and the second Demux driving of the second sub-pixel are sequentially performed in an enable time domain of the gate driving line.
3. The Demux driving method according to claim 1, wherein the first Demux driving of the first sub-pixel, the first Demux driving of the second sub-pixel, the Demux driving of the third sub-pixel, the second Demux driving of the second sub-pixel, and the second Demux driving of the first sub-pixel are sequentially performed in an enable time domain of the gate driving line.
4. The Demux driving method according to claim 1, wherein the first Demux driving signal of the first sub-pixel has an active duration equal to that of the second Demux driving signal of the first sub-pixel.
5. The Demux driving method according to claim 1, wherein the first Demux driving signal of the second sub-pixel has an active duration equal to that of the second Demux driving signal of the second sub-pixel.
6. The Demux driving method according to claim 1, wherein the Demux driving signal of the third sub-pixel has an active time period twice that of the first Demux driving signal of the first sub-pixel or twice that of the second sub-pixel.
7. The Demux driving method according to any of claims 1 to 6, wherein the third sub-pixel is a B-pixel.
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