CN111179872A - Pixel driving method - Google Patents
Pixel driving method Download PDFInfo
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- CN111179872A CN111179872A CN202010101523.0A CN202010101523A CN111179872A CN 111179872 A CN111179872 A CN 111179872A CN 202010101523 A CN202010101523 A CN 202010101523A CN 111179872 A CN111179872 A CN 111179872A
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
Abstract
A pixel driving method is characterized in that in the enabling process of a gate driving voltage of a pixel of a display screen, a gradually increased gate driving voltage is provided in the charging process of a first sub-pixel, a second sub-pixel and a third sub-pixel. Different from the prior art, the charging rates of the R/G/B sub-pixels can be basically consistent by adjusting the on-state current of the Gate and performing special waveform design in the technical scheme, and the charging rate of the G/B sub-pixels can be improved without modifying the manufacturing process of the Demux liquid crystal display screen by the method, so that the display effect is better, and the cost is saved.
Description
Technical Field
The invention relates to the field of pixel driving, in particular to a pixel driving method design.
Background
Due to the timing characteristics of the Demux lcd, the charging rate of each sub-pixel may be different or the charging may be insufficient. Here, as shown in fig. 1, it can be seen that in the prior art, the time from the falling edge of Demux _ R to the falling edge of Gate is the time from Data Line to Pixel, at this time, the Data Line transmits the Data of R sub-pixels, and the charging time is t 1; the time from the falling edge of Demux _ G to the falling edge of Gate is the time for charging the Pixel by the Data Line, at this time, the Data transmitted by the Data Line is the Data of the sub-Pixel G, and the charging time is t 2; the time from the falling edge of Demux _ B to the falling edge of Gate is the time from the Data Line to the Pixel, at this time, the Data transmitted by the Data Line is the Data of the B sub-Pixel, and the charging time is t 3; since the High voltage of the Gate is kept unchanged all the time, the charging rate of the Data Line to the Pixel is only related to the charging time of the Dta Line to the Pixel, and it can be seen from the figure that t1> t2> t3, namely, the charging rate of the Data Line to the R sub-Pixel is greater than that of the G sub-Pixel, the charging rate of the Data Line to the G sub-Pixel is greater than that of the B sub-Pixel, and the inherent brightness of the B sub-Pixel is lower than that of R/G, so that the display of the Demux liquid crystal display screen is abnormal. For example, the white picture is originally that the R/G/B sub-pixels are lighted together, but now because the charging rate of the B sub-pixel is insufficient, the charging rate of the R/G sub-pixel is high and bright enough, the charging rate of the B sub-pixel is too low, the brightness is too low, and the whole white picture becomes yellow (green plus red is yellow); if the G sub-pixels are not charged enough, the brightness of the entire lcd will be reduced because human eyes are more sensitive to green, i.e., the G sub-pixels contribute more to the brightness of the lcd than R/B.
Disclosure of Invention
Therefore, it is desirable to provide a new pixel driving method to solve the problem of insufficient charging of some sub-pixels.
To achieve the above object, the inventor provides a pixel driving method, in which a gate driving voltage is supplied to sequentially increase during charging of a first sub-pixel, a second sub-pixel, and a third sub-pixel during enabling of the gate driving voltage of a pixel of a display panel.
In particular, during the enabling process of the gate driving voltage of the pixel of the display screen, the method comprises the following steps,
in the first stage, the grid driving voltage is a first on-state voltage, the first sub-pixel Demux signal is turned on, the first sub-pixel Demux signal is turned off, the second sub-pixel Demux signal is turned on, and the second sub-pixel Demux signal is turned off;
in the second stage, the grid driving voltage is a second on-state voltage, the second on-state voltage is larger than the first on-state voltage, the third sub-pixel Demux signal is started, and the third sub-pixel Demux signal is closed;
in the third stage, the gate driving voltage is a third on-state voltage, the third on-state voltage is greater than the second on-state voltage, and the third on-state voltage is maintained until the gate driving voltage is turned off.
Specifically, the gate driving voltage is changed to the second on-state voltage while the second sub-pixel Demux signal is turned off.
Specifically, the gate driving voltage is the third on-state voltage while the third sub-pixel Demux signal is off.
Different from the prior art, the charging rates of the R/G/B sub-pixels can be basically consistent by adjusting the on-state current of the Gate and performing special waveform design in the technical scheme, and the charging rate of the G/B sub-pixels can be improved without modifying the manufacturing process of the Demux liquid crystal display screen by the method, so that the display effect is better, and the cost is saved.
Drawings
FIG. 1 is a schematic diagram of a prior art Gate waveform according to the background art;
FIG. 2 is a schematic diagram of a pixel driving waveform according to an embodiment;
fig. 3 is a graph of Vgs versus Ids for a TFT 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. 2, in order to provide a new technical solution of the present invention, the High voltage of the Gate is adjusted in three stages, and it can be seen from the figure that, in the pixel driving method, in the enabling process of the Gate driving voltage of the pixel of the display screen, the gradually increased Gate driving voltage is provided in the charging process of the first sub-pixel, the second sub-pixel and the third sub-pixel. The charging processes of the first sub-pixel, the second sub-pixel and the third sub-pixel are triggered in sequence, so that the charging time is long, and the effect of improving the charging rate of the pixels of the display screen can be achieved by providing the gradually increased gate driving voltage.
Referring to fig. 2 again, the first sub-pixel, the second sub-pixel, and the third sub-pixel are RGB pixels, respectively, for example, and the same technical effect can be achieved even if the driving sequence of any pixel is changed. Fig. 2 further specifically includes the following steps, in the first stage, the gate driving voltage is the first on-state voltage V1, the first sub-pixel Demux signal is turned on, the first sub-pixel Demux signal is turned off, the second sub-pixel Demux signal is turned on, and the second sub-pixel Demux signal is turned off; in the second stage, the gate driving voltage is a second on-state voltage V2, the second on-state voltage is greater than the first on-state voltage, the third sub-pixel Demux signal is turned on, and the third sub-pixel Demux signal is turned off; in the third stage, the gate driving voltage is a third on-state voltage V3, where the third on-state voltage is greater than the second on-state voltage, and the third on-state voltage is maintained until the gate driving voltage is turned off. And has V3> V2> V1. Through the specific design of the driving method, the charging efficiency of the third sub-pixel can be guaranteed, and the problem of insufficient charging rate of the existing display screen is solved.
In other embodiments shown in FIG. 2, the gate driving voltage is changed to the second on-state voltage while the second sub-pixel Demux signal is turned off. Of course, the ideal case is the same time here, and the advantage of designing the two steps at the same time is that the operation of the driving method can be made more compact.
In other embodiments shown in FIG. 2, the gate driving voltage is the third on-state voltage while the third sub-pixel Demux signal is off. The simultaneous design of the two steps is an ideal case, and the advantage of the simultaneous design of the two steps is that the operation of the driving method can be more compact.
Of course, it is only necessary to ensure that the gate driving voltages received in the charging process of the first sub-pixel, the charging process of the second sub-pixel, and the charging process of the third sub-pixel are V1, V2, and V3 that are gradually increased, and the charging process of the sub-pixel is the time from the turn-off of the Demux signal (the de-interleaving signal) to the turn-off of the gate driving voltage signal. Therefore, in other embodiments, we can also perform the following steps instead: the gate driving voltage is changed to the second on-state voltage and maintained while the second sub-pixel Demux signal is turned on. The step may be performed instead, and the gate driving voltage is changed to the third on-state voltage until the gate driving signal is turned off while the third subpixel Demux signal is turned on. According to the scheme, the third sub-pixel can be ensured to have higher charging rate, and the problem of insufficient charging of the display screen is solved.
fig. 3 is a graph showing a relationship between Vgs (a voltage difference between a High voltage of a Gate and a Pixel voltage) and Ids (a current between a Source electrode and a Drain electrode) of the TFT, Ion corresponding to a voltage V1 (in this case, the Gate High voltage is 15V and is adjustable) in the ① stage is ①, Ion corresponding to a voltage V2 (in this case, the Gate High voltage is 20V and is adjustable) in the ② stage is ②, and Ion corresponding to a voltage V3 (in this case, the Gate High voltage is 25V and is adjustable) in the ③ stage is ③, and it is known from a relationship curve between Vgs and Ids that, when the Gate High voltage is increased, the turn-on current of the Gate Ion is also increased, that is, n at V3> Ion at V2> Ion at V1.
In fig. 2, in the first stage, the Gate voltage is a High voltage (generally about 10V) at which the normal TFT can be turned on, and at this time, for the R sub-Pixel, the charging time from the Data Line to the Pixel electrode is t1, the charging time is sufficient, and the R sub-Pixel has no problem of insufficient charging; in the second stage, because the High voltage of the Gate is increased, Ion (on current) of the Gate is increased, the Data Line charges the G sub-pixel faster, and the problem of insufficient charging of the G sub-pixel can be avoided; in the second stage, because Demux _ B is in the open state, the IC transmits the B sub-pixel data to the plane, and the Gate increases the High voltage and the charging rate of the B sub-pixel in the second stage; in the third stage, after the Demux _ B is turned off, the Data Line still charges the Pixel, and at this time, the Gate High voltage is increased to increase the Ion (on current) of the Gate, so that the Data Line charges the sub-Pixel Data of the B sub-Pixel to the Pixel to an ideal voltage more quickly; this patent has done the action that once improves the charging rate to G sub-pixel, to G, because Data Line is longer to G sub-pixel's charge time itself, can to its charging rate do once improve, to B sub-pixel, this patent has done the action that twice improves the charging rate for B specially, guarantees that B sub-pixel charges enough. In conclusion, after the special waveform design, the charging rates of the R/G/B sub-pixels are improved at the same time, so that the display effect of the Demux liquid crystal display screen is improved well.
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 (4)
1. A pixel driving method is characterized in that,
in the enabling process of the grid driving voltage of the pixel of the display screen, the grid driving voltage which is gradually increased is provided in the charging process of the first sub-pixel, the second sub-pixel and the third sub-pixel.
2. The pixel driving method according to claim 1, comprising the steps of, during gate driving voltage enabling of the pixels of the display panel,
in the first stage, the grid driving voltage is a first on-state voltage, the first sub-pixel Demux signal is turned on, the first sub-pixel Demux signal is turned off, the second sub-pixel Demux signal is turned on, and the second sub-pixel Demux signal is turned off;
in the second stage, the grid driving voltage is a second on-state voltage, the second on-state voltage is larger than the first on-state voltage, the third sub-pixel Demux signal is started, and the third sub-pixel Demux signal is closed;
in the third stage, the gate driving voltage is a third on-state voltage, the third on-state voltage is greater than the second on-state voltage, and the third on-state voltage is maintained until the gate driving voltage is turned off.
3. The pixel driving method according to claim 2, wherein the gate driving voltage is changed to the second on-state voltage while the second sub-pixel Demux signal is turned off.
4. The pixel driving method according to claim 2, wherein the gate driving voltage is a third on-state voltage while the third sub-pixel Demux signal is off.
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| CN202010101523.0A CN111179872B (en) | 2020-02-19 | 2020-02-19 | Pixel driving method |
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| CN202010101523.0A CN111179872B (en) | 2020-02-19 | 2020-02-19 | Pixel driving method |
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| CN111179872B CN111179872B (en) | 2021-08-20 |
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| CN102338947A (en) * | 2010-07-20 | 2012-02-01 | 乐金显示有限公司 | Liquid crystal display and method of driving the same |
| US20130093743A1 (en) * | 2010-06-25 | 2013-04-18 | Sharp Kabushiki Kaisha | Scanning signal line drive circuit and display device provided with same |
| US20150295575A1 (en) * | 2014-04-15 | 2015-10-15 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | Gate driving circuit and gate driving method |
| CN105589235A (en) * | 2016-03-11 | 2016-05-18 | 深圳市华星光电技术有限公司 | Liquid crystal display panel driving method |
| CN106782407A (en) * | 2017-02-16 | 2017-05-31 | 厦门天马微电子有限公司 | The driving method and display panel of a kind of display panel |
| CN108615495A (en) * | 2018-04-27 | 2018-10-02 | 深圳市华星光电半导体显示技术有限公司 | A kind of multiplexing driving circuit and driving method, display equipment |
-
2020
- 2020-02-19 CN CN202010101523.0A patent/CN111179872B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130093743A1 (en) * | 2010-06-25 | 2013-04-18 | Sharp Kabushiki Kaisha | Scanning signal line drive circuit and display device provided with same |
| CN102338947A (en) * | 2010-07-20 | 2012-02-01 | 乐金显示有限公司 | Liquid crystal display and method of driving the same |
| US20150295575A1 (en) * | 2014-04-15 | 2015-10-15 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | Gate driving circuit and gate driving method |
| CN105589235A (en) * | 2016-03-11 | 2016-05-18 | 深圳市华星光电技术有限公司 | Liquid crystal display panel driving method |
| CN106782407A (en) * | 2017-02-16 | 2017-05-31 | 厦门天马微电子有限公司 | The driving method and display panel of a kind of display panel |
| CN108615495A (en) * | 2018-04-27 | 2018-10-02 | 深圳市华星光电半导体显示技术有限公司 | A kind of multiplexing driving circuit and driving method, display equipment |
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| CN111179872B (en) | 2021-08-20 |
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