CN105913820A - Feedthrough voltage compensating circuit, liquid crystal display device and feedthrough voltage compensation method - Google Patents
Feedthrough voltage compensating circuit, liquid crystal display device and feedthrough voltage compensation method Download PDFInfo
- Publication number
- CN105913820A CN105913820A CN201610425505.1A CN201610425505A CN105913820A CN 105913820 A CN105913820 A CN 105913820A CN 201610425505 A CN201610425505 A CN 201610425505A CN 105913820 A CN105913820 A CN 105913820A
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- China
- Prior art keywords
- film transistor
- tft
- thin film
- common line
- liquid crystal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a feedthrough voltage compensating circuit, a liquid crystal display device and a feedthrough voltage compensation method. The feedthrough voltage compensating circuit of the liquid crystal display device comprises a common line and a storage capacitor. One end of the storage capacitor is connected to a drain electrode of a film transistor corresponding to liquid crystal molecules, and the other end is connected to the common line. The common line is connected with a switching switch. The switching switch comprises two input ends, one input end is connected to a high level reference voltage, and the other input end is connected to a low level compensation voltage. According to the invention, the switching switch is utilized to switch the common line, and a selection circuit switches the common line to a low level signal of the compensation voltage when a TFT gate voltage is in a high level; and the common line is switched to a high level signal of the reference voltage when the TFT gate voltage is in a low level. In this way, a voltage rise is provided to the common line when the TFT is closed, so that the voltage rise of the ends, connected to the drain electrode of the film transistor corresponding to liquid crystal molecules, of pixels is realized, and the voltage fall caused by a feedthrough voltage is compensated.
Description
Technical field
The present invention relates to field of liquid crystal display, in particular, relate to a kind of feed-trough voltage and compensate circuit, liquid crystal display dress
Put and feed-trough voltage compensation method.
Background technology
Existing liquid crystal indicator many employings TFT carries out the display of pixel and controls.
As it is shown in figure 1, the gate of TFT connects scan line, source electrode connects data wire, and drain electrode connects pixel electrode, pixel electricity
Form pixel capacitance C (LC) between pole and color membrane substrates (CF-Vcom), pixel capacitance is parallel with compensation electric capacity C (st), compensates electricity
Appearance C (st) one end connects with the drain electrode of TFT, and the other end connects common line Vcom.Owing to existing between gate and the drain electrode of TFT
Parasitic capacitance Cgs, the pressure drop connecting lock end at the moment C (gs) of TFT closedown causes the voltage at pixel two ends to decrease, produces
Feed-trough voltage, causes the display brightness to decline.Feed-trough voltage is different, in the case of display screen only one of which Vcom, to causing
Display screen diverse location, has different brightness.As in figure 2 it is shown, for the liquid crystal indicator of bilateral driving, common phenomenon is
Display screen is under low grey menu, and left and right sides picture is brighter.
Summary of the invention
The technical problem to be solved is to provide a kind of feed-trough voltage that can compensate for feed-trough voltage and compensates circuit, liquid
Crystal device and feed-trough voltage compensation method.
It is an object of the invention to be achieved through the following technical solutions: the feed-trough voltage of a kind of liquid crystal display compensates electricity
Road, including common line and storage electric capacity, described storage electric capacity one end is connected to the drain electrode of thin film transistor (TFT) corresponding to liquid crystal molecule,
The other end is connected to described common line, and described common line connects switching switch, and described switching switch includes two inputs, and one
Individual input is connected to the reference voltage of high level, and another input is connected to low level compensation voltage.
Preferably, described common line at least two, every common line connects storage electric capacity, every common line described in one group
A corresponding switching switch.Being in the pixel of diverse location, its parameter is variant, and every common line controls one group of display pixel,
Different compensation voltage can be set according to the difference of parameter, improve control accuracy, improve display quality further.
Preferably, described switching switch includes the first film transistor and the second thin film transistor (TFT), and described the first film is brilliant
The source electrode of body pipe is connected to described reference voltage, and the source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, two
The drain electrode of thin film transistor (TFT) is commonly connected to same common line, and the gate of described the first film transistor is connected to described benchmark electricity
Pressure, the gate of the second thin film transistor (TFT) is connected to the scan line of the liquid crystal display of correspondence.Existing display panels is most
Use thin film transistor (TFT) to control the display of pixel, therefore use thin film transistor (TFT) to switch as switching, in film crystal control
Can synchronize to be formed the thin film transistor (TFT) of switching switch during journey, advantageously reduce manufacturing cost.
Preferably, described the first film transistor and the second thin film transistor (TFT) are all N-type metal-oxide-semiconductor.
Preferably, described switching switch includes the first film transistor and the second thin film transistor (TFT), and described the first film is brilliant
The source electrode of body pipe is connected to described reference voltage, and the source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, two
The drain electrode of thin film transistor (TFT) is commonly connected to same common line, described the first film transistor and the gate of the second thin film transistor (TFT)
It is connected to the scan line of liquid crystal display corresponding to same.This is another kind of concrete control mode.
Preferably, described the first film transistor is p-type metal-oxide-semiconductor, and described second thin film transistor (TFT) is N-type metal-oxide-semiconductor.
Preferably, described common line at least two, every common line connects storage electric capacity, every common line described in one group
A corresponding switching switch, described switching switch includes the first film transistor and the second thin film transistor (TFT), described the first film
The source electrode of transistor is connected to described reference voltage, and gate is connected to described reference voltage；The source of described second thin film transistor (TFT)
Pole is connected to described compensation voltage, and gate is connected to the scan line of the liquid crystal display of correspondence；The drain electrode of two thin film transistor (TFT)s
Being commonly connected to same common line, described the first film transistor and the second thin film transistor (TFT) are all N-type metal-oxide-semiconductor.
Preferably, described common line at least two, every common line connects storage electric capacity, every common line described in one group
A corresponding switching switch, described switching switch includes the first film transistor and the second thin film transistor (TFT), described the first film
The source electrode of transistor is connected to described reference voltage；The source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, institute
The gate stating the first film transistor and the second thin film transistor (TFT) is connected to the scan line of liquid crystal display corresponding to same, leakage
Pole is commonly connected to same common line, and described the first film transistor is p-type metal-oxide-semiconductor, and described second thin film transistor (TFT) is N-type
Metal-oxide-semiconductor.
A kind of liquid crystal indicator, the feed-trough voltage including above-mentioned a kind of liquid crystal display compensates circuit.
The feed-trough voltage compensation method of a kind of liquid crystal display, including step: when current scan line drives, by switching
Switch and corresponding common line is switched to low level compensation voltage；When scanning line driving is cancelled, common line is switched to height
The reference voltage of level.
Due to the fact that have employed switching switch switches over common line, selection circuit is high electricity in TFT gate voltage
At ordinary times, common line switches to compensate the low level signal of voltage；TFT gate voltage is low level, and common line switches to benchmark electricity
The high level signal of pressure, thus can promote the electricity at pixel two ends when TFT closes from common line gives a pressure liter
Press liter, promote display brightness.
Accompanying drawing explanation
Fig. 1 is existing liquid crystal display device drive circuit schematic diagram.
Fig. 2 is the distortion schematic diagram of the gate voltage of existing a kind of liquid crystal indicator.
Fig. 3 is the principle schematic of the present invention.
Fig. 4 is the principle schematic of the embodiment of the present invention one.
Fig. 5 is the principle schematic of the embodiment of the present invention two.
Fig. 6 is driving principle schematic diagram of the present invention.
Detailed description of the invention
The invention will be further described with preferred embodiment below in conjunction with the accompanying drawings.
As it is shown on figure 3, a kind of liquid crystal indicator, the feed-trough voltage including above-mentioned a kind of liquid crystal display compensates electricity
Road, the feed-trough voltage of this liquid crystal display compensates circuit and includes common line and storage electric capacity, and described storage electric capacity one end is connected to
The drain electrode of the thin film transistor (TFT) that liquid crystal molecule is corresponding, the other end is connected to described common line, and described common line connects has switching to open
Closing, described switching switch includes two inputs, and an input is connected to the reference voltage of high level, and another input is even
It is connected to low level compensation voltage.Described common line can be one, it is also possible to is a plurality of, the most a plurality of common line, and every altogether
Logical line connects storage electric capacity described in one group, every corresponding switching switch of common line.So it is in the pixel of diverse location, its
Parameter is variant, and every common line controls one group of display pixel, can arrange different compensation voltage according to the difference of parameter, carry
High control precision, improves display quality further.
Embodiment one
As shown in Figure 4, switching switch includes the first film transistor T1 and the second thin film transistor (TFT) T2, the first film transistor T1
Source electrode and gate be connected to reference voltage A-Vcom；The source electrode of described second thin film transistor (TFT) T2 is connected to described compensation voltage
A-Vcom-low, gate is connected to the scan line of the liquid crystal display of correspondence, and the drain electrode of two thin film transistor (TFT)s is commonly connected to
Same common line Vcom.
Preferably, described the first film transistor T1 and the second thin film transistor (TFT) T2 is N-type metal-oxide-semiconductor.Certain two thin
Film transistor is all p-type metal-oxide-semiconductor, or one for N-type metal-oxide-semiconductor, another for p-type metal-oxide-semiconductor be also feasible.
Existing display panels uses thin film transistor (TFT) to control the display of pixel mostly, therefore uses film crystal
Pipe, as switching switch, can synchronize to be formed the thin film transistor (TFT) of switching switch during thin film transistor (TFT) processing procedure, be conducive to fall
Low manufacturing cost.
Embodiment two
As described in Figure 5, switching switch includes the first film transistor T1 and the second thin film transistor (TFT) T2, described the first film crystal
The source electrode of pipe T1 is connected to described reference voltage A-Vcom, and the source electrode of described second thin film transistor (TFT) T2 is connected to described compensation electricity
Pressure A-Vcom-low, the drain electrode of two thin film transistor (TFT)s is commonly connected to same common line Vcom.Described the first film transistor
The gate of T1 and the second thin film transistor (TFT) T2 is connected to the scan line of liquid crystal display corresponding to same.This is another kind of concrete
Control mode.
Preferably, described the first film transistor T1 is p-type metal-oxide-semiconductor, and described second thin film transistor (TFT) T2 is N-type metal-oxide-semiconductor.
Certain two thin film transistor (TFT)s are all p-type metal-oxide-semiconductor or N-type metal-oxide-semiconductor or the first film transistor T1 is N-type metal-oxide-semiconductor, second
Thin film transistor (TFT) T2 be the technical scheme of p-type metal-oxide-semiconductor be also feasible.
Existing display panels uses thin film transistor (TFT) to control the display of pixel mostly, therefore uses film crystal
Pipe, as switching switch, can synchronize to be formed the thin film transistor (TFT) of switching switch during thin film transistor (TFT) processing procedure, be conducive to fall
Low manufacturing cost.
As described in Figure 6, the feed-trough voltage of above-mentioned a kind of liquid crystal display compensates circuit by changing the voltage of common line
Compensate the feed-trough voltage of corresponding scan line.Specifically, when its driving process is included in current scan line driving, scan line
Voltage Vgate is high level, now by switching switch, corresponding common line is switched to low level compensation voltage；Work as scanning
Line drives when cancelling, and the voltage Vgate of scan line is low level, common line is switched to the reference voltage of high level, via tune
Whole common line waveform Vcom, reaches the correction of feed-trough voltage.If common line has a plurality of, can be according to scan line at diverse location
The difference of the RC capacitance-resistance effect (Gate RC) at place, arranges different compensation voltage.When Gate RC is less, feed-trough voltage correction
Many.When otherwise Gate RC is bigger, lacking of feed-trough voltage correction.After compensation, in the pixel two that same scan line diverse location is corresponding
Voltage (Vpixel) waveform of end keeps consistent substantially.
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of present inventive concept, it is also possible to make some simple deduction or replace, all should be considered as belonging to the present invention's
Protection domain.
Claims (10)
1. the feed-trough voltage of liquid crystal display compensates a circuit, including common line and storage electric capacity, described storage electric capacity one end
Being connected to the drain electrode of thin film transistor (TFT) corresponding to liquid crystal molecule, the other end is connected to described common line, it is characterised in that described common
Logical line connects switching switch, and described switching switch includes that two inputs, an input are connected to the benchmark electricity of high level
Pressure, another input is connected to low level compensation voltage.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 1 compensates circuit, it is characterised in that described common line
At least two, every common line connects storage electric capacity described in one group, every corresponding switching switch of common line.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 1 compensates circuit, it is characterised in that described switching is opened
Pass includes that the first film transistor and the second thin film transistor (TFT), the source electrode of described the first film transistor are connected to described benchmark electricity
Pressure, the source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, and the drain electrode of two thin film transistor (TFT)s is commonly connected to
Same common line, the gate of described the first film transistor is connected to described reference voltage, and the gate of the second thin film transistor (TFT) is even
Receive the scan line of the liquid crystal display of correspondence.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 3 compensates circuit, it is characterised in that described first thin
Film transistor and the second thin film transistor (TFT) are all N-type metal-oxide-semiconductor.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 1 compensates circuit, it is characterised in that described switching is opened
Pass includes that the first film transistor and the second thin film transistor (TFT), the source electrode of described the first film transistor are connected to described benchmark electricity
Pressure, the source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, and the drain electrode of two thin film transistor (TFT)s is commonly connected to
Same common line, the gate of described the first film transistor and the second thin film transistor (TFT) is connected to the liquid crystal display that same is corresponding
The scan line of device.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 5 compensates circuit, it is characterised in that described first thin
Film transistor is p-type metal-oxide-semiconductor, and described second thin film transistor (TFT) is N-type metal-oxide-semiconductor.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 1 compensates circuit, it is characterised in that described common line
At least two, every common line connects storage electric capacity described in one group, every corresponding switching switch of common line, described switching
Switch includes that the first film transistor and the second thin film transistor (TFT), the source electrode of described the first film transistor are connected to described benchmark
Voltage, gate is connected to described reference voltage；The source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, and gate is even
Receive the scan line of the liquid crystal display of correspondence；The drain electrode of two thin film transistor (TFT)s is commonly connected to same common line, and described
One thin film transistor (TFT) and the second thin film transistor (TFT) are all N-type metal-oxide-semiconductor.
The feed-trough voltage of a kind of liquid crystal display the most as claimed in claim 1 compensates circuit, it is characterised in that described common line
At least two, every common line connects storage electric capacity described in one group, every corresponding switching switch of common line, described switching
Switch includes that the first film transistor and the second thin film transistor (TFT), the source electrode of described the first film transistor are connected to described benchmark
Voltage；The source electrode of described second thin film transistor (TFT) is connected to described compensation voltage, described the first film transistor and the second thin film
The gate of transistor is connected to the scan line of liquid crystal display corresponding to same, and drain electrode is commonly connected to same common line, institute
Stating the first film transistor is p-type metal-oxide-semiconductor, and described second thin film transistor (TFT) is N-type metal-oxide-semiconductor.
9. a liquid crystal indicator, the feed-trough voltage including a kind of liquid crystal display as described in as arbitrary in claim 1～8 is mended
Repay circuit.
10. a feed-trough voltage compensation method for liquid crystal display, including step: when current scan line drives, by switching
Switch and corresponding common line is switched to low level compensation voltage；When scanning line driving is cancelled, common line is switched to height
The reference voltage of level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610425505.1A CN105913820A (en) | 2016-06-15 | 2016-06-15 | Feedthrough voltage compensating circuit, liquid crystal display device and feedthrough voltage compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610425505.1A CN105913820A (en) | 2016-06-15 | 2016-06-15 | Feedthrough voltage compensating circuit, liquid crystal display device and feedthrough voltage compensation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105913820A true CN105913820A (en) | 2016-08-31 |
Family
ID=56750266
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610425505.1A Withdrawn CN105913820A (en) | 2016-06-15 | 2016-06-15 | Feedthrough voltage compensating circuit, liquid crystal display device and feedthrough voltage compensation method |
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| CN (1) | CN105913820A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987620A (en) * | 2005-12-23 | 2007-06-27 | 群康科技(深圳)有限公司 | Liquid crystal display and its compensating feed through voltage method |
| CN101364020A (en) * | 2008-09-17 | 2009-02-11 | 友达光电股份有限公司 | Display panel and pixel structure thereof |
| CN102610205A (en) * | 2012-03-29 | 2012-07-25 | 深圳市华星光电技术有限公司 | Feed-through voltage compensation circuit, liquid crystal display device and feed-through voltage compensation method |
| CN103135297A (en) * | 2011-11-30 | 2013-06-05 | 上海中航光电子有限公司 | Thin film transistor liquid crystal display device and disconnected data line repairing method thereof |
| CN103744209A (en) * | 2014-02-07 | 2014-04-23 | 友达光电股份有限公司 | Feed-through voltage compensating circuit and pixel circuit thereof |
-
2016
- 2016-06-15 CN CN201610425505.1A patent/CN105913820A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987620A (en) * | 2005-12-23 | 2007-06-27 | 群康科技(深圳)有限公司 | Liquid crystal display and its compensating feed through voltage method |
| CN101364020A (en) * | 2008-09-17 | 2009-02-11 | 友达光电股份有限公司 | Display panel and pixel structure thereof |
| CN103135297A (en) * | 2011-11-30 | 2013-06-05 | 上海中航光电子有限公司 | Thin film transistor liquid crystal display device and disconnected data line repairing method thereof |
| CN102610205A (en) * | 2012-03-29 | 2012-07-25 | 深圳市华星光电技术有限公司 | Feed-through voltage compensation circuit, liquid crystal display device and feed-through voltage compensation method |
| CN103744209A (en) * | 2014-02-07 | 2014-04-23 | 友达光电股份有限公司 | Feed-through voltage compensating circuit and pixel circuit thereof |
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Application publication date: 20160831 |