CN115064134A - Demux circuit for improving charging rate of panel positive frame and driving method thereof - Google Patents
Demux circuit for improving charging rate of panel positive frame and driving method thereof Download PDFInfo
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- CN115064134A CN115064134A CN202210786263.4A CN202210786263A CN115064134A CN 115064134 A CN115064134 A CN 115064134A CN 202210786263 A CN202210786263 A CN 202210786263A CN 115064134 A CN115064134 A CN 115064134A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002834 transmittance Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 1
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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
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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
- G09G2320/02—Improving the quality of display appearance
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Abstract
The invention discloses a Demux circuit for improving the charging rate of a positive frame of a panel and a driving method thereof. Through a dynamic compensation strategy, the VGH voltage is increased by the Demux + TFT when a Data positive frame is charged, the charging rate of the positive frame is improved, the charging rate of the Demux-TFT to the Data negative frame is kept unchanged, the charging rate of the Demux TFT to the positive frame and the negative frame is balanced, the voltage of the Source positive frame and the voltage of the Source negative frame entering the surface through the Demux TFT are consistent, Vp negative = Vp positive, and the problem of insufficient panel transmittance is solved.
Description
Technical Field
The invention relates to the technical field of panel display, in particular to a Demux circuit for improving the charging rate of a panel positive frame and a driving method thereof.
Background
To reduce IC output Data routing, shorten the bottom border of the panel, de-multiplexer (abbreviated as Demux) technology has been developed. As shown in fig. 1, the so-called Demux technique is to split a Data trace output from an IC into a plurality of Source traces input into a plane, and each Source trace is controlled by a Demux TFT. In addition, the conventional Liquid Crystal Display (LCD) needs ac driving due to the characteristics of liquid crystal (liquid crystal) during operation, that is, a positive voltage and a negative voltage are applied to the liquid crystal within one frame of a display. As shown in fig. 2, since the voltage step of Demux for the negative frame is greater than the voltage step of Demux for the positive frame, the charging rate of the negative frame is greater than that of the positive frame, and as shown in fig. 3, the positive and negative frame voltages entering the plane via the Demux TFT have different magnitudes Vp negative > Vp positive, resulting in insufficient panel transmittance. Therefore, in order to improve the insufficient transmittance of the panel, it is important to compensate the Demux signal.
Disclosure of Invention
The invention aims to provide a Demux circuit for improving the charging rate of a panel in a positive frame and a driving method thereof.
The technical scheme adopted by the invention is as follows:
a Demux circuit for improving the charging rate of a positive frame of a panel comprises a plurality of Data wires, wherein each Data wire is respectively connected with at least one path of Source signal, and a pair of Demux TFT switches are arranged on the line of each path of Source signal; the same pair of Demux TFT switches comprises a first Demux TFT for controlling Data + and a second Demux TFT for controlling Data-which are arranged in parallel; the input ends of a first Demux TFT and a second Demux TFT of the same pair of Demux TFT switches are connected to the same Data wire; the output ends of the first Demux TFT and the second Demux TFT of the same pair of Demux TFT switches are connected to the same Source signal together; the grid electrodes of the first Demux TFT and the second Demux TFT of the same pair of Demux TFT switches are respectively connected to the Demux + signals and Demux-signals which are arranged in pairs in a one-to-one correspondence manner; the Demux + signal and Demux-signal are connected to the IC; the IC control Demux + signal increases VGH voltage to VGH + DeltaV when a Data positive frame is charged so as to improve the charging rate of the positive frame, wherein the DeltaV is the difference of Vgs of positive and negative frames; the IC controls the Demux-signal to keep the normal VGH unchanged during the Data negative frame.
A drive method of a Demux circuit for improving the positive frame charging rate of a panel comprises the following steps:
step 2, the IC acquires the output Data signal;
step 3, judging whether the Data signal is a positive frame Data; if yes, the IC gradually increases VGH of the Demux + signal by delta V and then outputs the VGH; Δ V is the difference of positive and negative frames Vgs; the IC normally outputs the Demux-signal so that the VGH size remains unchanged.
Further, the specific steps of step 3 are as follows:
when the IC outputs a positive frame Data, the voltage of the Demux-signal is VGL, so that the TFT of the Demux-is in a closed state; the voltage of the Demux + signal is VGH, the TFT of the Demux-is enabled to be opened to transmit a Data signal, the Demux + signal is dynamically compensated, the IC gradually increases the corresponding Demux + signal from VGH to VGH +. DELTA.V according to the difference value of the positive frame Vgs and the negative frame Vgs, and the DeltaV = the negative frame Vgs-the positive frame Vgs;
when Data is a negative frame, the voltage of the Demux + signal is VGL, so that the TFT of the Demux + is in an off state; the voltage of the Demux-signal is VGH, so that the TFT of the Demux-is turned on to transmit a Data signal, and the VGH size of the Demux-signal is kept unchanged.
According to the technical scheme, each row of Source signals are controlled by a pair of Demux TFT switches, and meanwhile, the same pair of Demux TFT switches are controlled by a corresponding group of Demux +/Demux-respectively in time sequence aiming at the same pair of Demux TFT switches. Through a dynamic compensation strategy, the VGH voltage is increased by the Demux < + > TFT when a Data positive frame is charged, the charging rate of the positive frame is improved, the charging rate of the Demux < - > TFT to the Data negative frame is kept unchanged, the charging rate of the Demux TFT to the positive frame and the negative frame (negative frame Vgs = positive frame Vgs) is balanced, the Source positive and negative frame voltages entering the plane through the Demux TFT are consistent with Vp negative = Vp positive, and the problem of insufficient panel transmittance is solved.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
FIG. 1 is a schematic diagram of a conventional Demux circuit
FIG. 2 is a schematic diagram of the positive and negative frame charge rates of a conventional Demux circuit;
FIG. 3 is a schematic diagram of the magnitude of positive and negative frame voltages in a conventional Demux circuit plane;
FIG. 4 is a schematic diagram of a Demux circuit for improving the charging rate of a panel in a positive frame according to the present invention;
FIG. 5 is a schematic diagram of driving signals of a Demux circuit for improving the charging rate of a panel in a positive frame according to the present invention;
FIG. 6 is a schematic diagram of positive and negative frame charge rates of a Demux circuit for improving the positive frame charge rate of a panel according to the present invention;
FIG. 7 is a flowchart illustrating a driving method of a Demux circuit for improving a charging rate of a panel in a positive frame according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
As shown in one of fig. 4 to 7, the present invention discloses a Demux circuit for improving the charging rate of a positive frame of a panel, which includes a plurality of Data traces, each Data trace is connected to at least one Source signal, and a pair of Demux TFT switches is disposed on the trace of each Source signal; the same pair of Demux TFT switches comprises a first Demux TFT for controlling Data + and a second Demux TFT for controlling Data-which are arranged in parallel; the input ends of a first Demux TFT and a second Demux TFT of the same pair of Demux TFT switches are connected to the same Data wire; the output ends of the first Demux TFT and the second Demux TFT of the same pair of Demux TFT switches are connected to the same Source signal together; the grid electrodes of the first Demux TFT and the second Demux TFT of the same pair of Demux TFT switches are respectively connected to the Demux + signals and Demux-signals which are arranged in pairs in a one-to-one correspondence manner; the Demux + signal and Demux-signal are connected to the IC; the IC control Demux + signal increases VGH voltage to VGH + DeltaV when a Data positive frame is charged so as to improve the charging rate of the positive frame, wherein the DeltaV is the difference of Vgs of positive and negative frames; the IC controls the Demux-signal to keep the normal VGH unchanged during the Data negative frame.
A drive method of a Demux circuit for improving the positive frame charging rate of a panel comprises the following steps:
step 2, the IC acquires the output Data signal;
step 3, judging whether the Data signal is a positive frame Data; if yes, the IC gradually increases VGH of the Demux + signal by delta V and then outputs the result; Δ V is the difference of positive and negative frames Vgs; the IC normally outputs the Demux-signal so that the VGH size remains unchanged.
Further, the specific steps of step 3 are as follows:
when the IC outputs a positive frame Data, the voltage of the Demux-signal is VGL, so that the TFT of the Demux-is in a closed state; the voltage of the Demux + signal is VGH, so that a TFT of Demux-is opened to transmit a Data signal, the Demux + signal is dynamically compensated, and the IC gradually increases the corresponding Demux + signal from VGH to VGH +. DELTA.V according to the difference of a positive frame Vgs and a negative frame Vgs, wherein the DELTA.V = the negative frame Vgs-the positive frame Vgs;
when Data is a negative frame, the voltage of the Demux + signal is VGL, so that the TFT of the Demux + is in an off state; the voltage of the Demux-signal is VGH, so that the TFT of the Demux-is turned on to transmit a Data signal, and the VGH size of the Demux-signal is kept unchanged.
Structurally, as shown in FIG. 4, the Demux circuit of the present invention uses a pair of Demux TFT switches (Demux +/Demux-) to control a column of Source signals, as opposed to a conventional Demux circuit.
As shown in FIG. 5, the Demux timing of the present invention controls the TFT switches of Demux + and Demux-with a pair of Demux timings (Demux +/Demux-) separately in timing relative to the conventional Demux timing.
When the IC outputs positive frame Data, the voltage of a Demux-signal is VGL, a TFT of the Demux-is in a closed state, the voltage of a Demux + signal is VGH, the TFT of the Demux-is opened to transmit a Data signal, dynamic compensation is carried out on the Demux + signal, and the IC gradually increases the corresponding Demux + signal from VGH to VGH + Δ V according to the difference value of a positive frame Vgs (Δ V = negative frame Vgs-positive frame Vgs).
When Data is a negative frame, the voltage of the Demux + signal is VGL, so that the TFT of the Demux + is in an off state, the voltage of the Demux-signal is VGH, the TFT of the Demux-is turned on to transmit the Data signal, and the VGH size of the Demux-signal is kept unchanged.
As shown in fig. 6, under dynamic compensation, the VGH voltage is increased by the Demux + TFT when the Data positive frame is charged, so as to increase the charging rate of the positive frame, and the charging rate of the Demux-TFT to the Data negative frame is kept constant, so as to balance the charging rates of the Demux TFT to the positive and negative frames (negative frame Vgs = positive frame Vgs), and make the Source positive and negative frame voltages entering the plane through the Demux TFT consistent with Vp negative = Vp positive (fig. 6), thereby improving the problem of insufficient panel transmittance.
According to the technical scheme, each row of Source signals are controlled by a pair of Demux TFT switches, and meanwhile, the same pair of Demux TFT switches are controlled by a corresponding group of Demux +/Demux-respectively in time sequence. Through a dynamic compensation strategy, the VGH voltage is increased by the Demux < + > TFT when a Data positive frame is charged, the charging rate of the positive frame is improved, the charging rate of the Demux < - > TFT to the Data negative frame is kept unchanged, the charging rate of the Demux TFT to the positive frame and the negative frame (negative frame Vgs = positive frame Vgs) is balanced, the Source positive and negative frame voltages entering the plane through the Demux TFT are consistent with Vp negative = Vp positive, and the problem of insufficient panel transmittance is solved.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (3)
1. A Demux circuit for improving the positive frame charge rate of a panel, comprising: the Data line interface circuit comprises a plurality of Data lines, wherein each Data line is respectively connected with at least one path of Source signal, and a pair of Demux TFT switches are arranged on the line of each path of Source signal; the same pair of Demux TFT switches comprises a first Demux TFT for controlling Data + and a second Demux TFT for controlling Data-which are arranged in parallel; the input ends of a first Demux TFT and a second Demux TFT of the same pair of Demux TFT switches are connected to the same Data wire; the output ends of the first Demux TFT and the second Demux TFT of the same pair of Demux TFT switches are connected to the same Source signal together; the grid electrodes of the first Demux TFT and the second Demux TFT of the same pair of Demux TFT switches are respectively connected to the Demux + signals and Demux-signals which are arranged in pairs in a one-to-one correspondence manner; the Demux + signal and Demux-signal are connected to the IC; the IC controls the Demux + signal to increase the VGH voltage to VGH +. DELTA.V when the Data positive frame is charged so as to improve the charging rate of the positive frame, wherein the DELTA.V is the difference of Vgs of the positive frame and the negative frame; the IC controls the Demux-signal to keep the normal VGH unchanged during the Data negative frame.
2. A method for driving a Demux circuit for improving a front frame charging rate of a panel, according to claim 1, wherein the method comprises: the method comprises the following steps:
step 1, controlling a Data + TFT through a Demux + signal of a same column of Source signals, and controlling a Data-TFT through a corresponding Demux-signal;
step 2, the IC acquires the output Data signal;
step 3, judging whether the Data signal is a positive frame Data; if yes, the IC gradually increases VGH of the Demux + signal by delta V and then outputs the VGH; Δ V is the difference of positive and negative frames Vgs; the IC normally outputs the Demux-signal so that the VGH size remains unchanged.
3. The method of claim 2, wherein the method further comprises the steps of: the specific steps of step 3 are as follows:
when the IC outputs a positive frame Data, the voltage of the Demux-signal is VGL, so that the TFT of the Demux-is in a closed state; the voltage of the Demux + signal is VGH, the TFT of the Demux-is enabled to be opened to transmit a Data signal, the Demux + signal is dynamically compensated, the IC gradually increases the corresponding Demux + signal from VGH to VGH +. DELTA.V according to the difference value of the positive frame Vgs and the negative frame Vgs, and the DeltaV = the negative frame Vgs-the positive frame Vgs;
when Data is a negative frame, the voltage of the Demux + signal is VGL, so that the TFT of the Demux + is in an off state; the voltage of the Demux-signal is VGH, so that the TFT of the Demux-is turned on to transmit a Data signal, and the VGH size of the Demux-signal is kept unchanged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210786263.4A CN115064134A (en) | 2022-07-04 | 2022-07-04 | Demux circuit for improving charging rate of panel positive frame and driving method thereof |
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| CN202210786263.4A CN115064134A (en) | 2022-07-04 | 2022-07-04 | Demux circuit for improving charging rate of panel positive frame and driving method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106652930A (en) * | 2016-10-19 | 2017-05-10 | 厦门天马微电子有限公司 | Display panel, data driving circuit thereof, and display device |
| US20180301104A1 (en) * | 2017-04-17 | 2018-10-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Demux circuit |
| CN110648643A (en) * | 2019-09-30 | 2020-01-03 | 京东方科技集团股份有限公司 | Voltage adjusting method and device and display device |
| CN113284469A (en) * | 2021-05-26 | 2021-08-20 | 深圳市华星光电半导体显示技术有限公司 | Brightness adjusting method, brightness adjusting device and electronic equipment |
| CN113889051A (en) * | 2021-11-10 | 2022-01-04 | 福建华佳彩有限公司 | Driving method for improving uneven flicker of panel |
| CN114038438A (en) * | 2021-11-29 | 2022-02-11 | 京东方科技集团股份有限公司 | Drive circuit and display device |
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- 2022-07-04 CN CN202210786263.4A patent/CN115064134A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106652930A (en) * | 2016-10-19 | 2017-05-10 | 厦门天马微电子有限公司 | Display panel, data driving circuit thereof, and display device |
| US20180301104A1 (en) * | 2017-04-17 | 2018-10-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Demux circuit |
| CN110648643A (en) * | 2019-09-30 | 2020-01-03 | 京东方科技集团股份有限公司 | Voltage adjusting method and device and display device |
| CN113284469A (en) * | 2021-05-26 | 2021-08-20 | 深圳市华星光电半导体显示技术有限公司 | Brightness adjusting method, brightness adjusting device and electronic equipment |
| CN113889051A (en) * | 2021-11-10 | 2022-01-04 | 福建华佳彩有限公司 | Driving method for improving uneven flicker of panel |
| CN114038438A (en) * | 2021-11-29 | 2022-02-11 | 京东方科技集团股份有限公司 | Drive circuit and display device |
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Application publication date: 20220916 |
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