CN106157915A - The driving means of Thin Film Transistor-LCD and driving method - Google Patents
The driving means of Thin Film Transistor-LCD and driving method Download PDFInfo
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- CN106157915A CN106157915A CN201610796946.2A CN201610796946A CN106157915A CN 106157915 A CN106157915 A CN 106157915A CN 201610796946 A CN201610796946 A CN 201610796946A CN 106157915 A CN106157915 A CN 106157915A
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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
- 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
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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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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- Crystallography & Structural Chemistry (AREA)
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides driving means and the driving method of a kind of Thin Film Transistor-LCD, relate to display actuation techniques field.In order to solve in prior art, under high refreshing frequency, system GTG voltage max cannot reduce, S COF temperature is too high, and then the problem causing display effect difference, the present invention uses a kind of novel driving architecture design, utilizes multiple VGH voltage, in the low ash stage, system can use the relatively low reference voltage normal VGH voltage of collocation, the GTG needed for being obtained by white balance adjusting；In high gray section, system is by higher VGH voltage, it is ensured that charge efficiency, it is thus achieved that required GTG.The maximum of gray scale voltage can be reduced, and then to reduce S COF heating.
Description
Technical field
The invention belongs to display actuation techniques field, particularly relate to the driving dress of a kind of Thin Film Transistor-LCD
Put and driving method.
Background technology
(Thin Film Transistor Liquid Crystal Display, tft liquid crystal shows TFT-LCD
Show device) it is one of principal item of showing of current flat panel, have become as display platform important in modern IT, video product.
The main driving principle of TFT-LCD, as shown in Figure 1: trichroism for R/G/B compressed signal, control signal and power are passed through by system board
Wire rod is connected with the connector (adapter) on pcb board (print circuit board, printed panel), and data are passed through
After TCON (Timing Controller, time schedule controller) IC on pcb board processes, through pcb board, by S-COF (Source-
Chip on Film, source electrode membrane of flip chip) and G-COF (Gate-Chip on Film, grid membrane of flip chip) is with viewing area even
Connect so that LCD obtain needed for power supply, signal.
In 8bit (8) display system being widely used at present, system the brightest will be divided into 256 ashes to the darkest picture
Rank, it may be assumed that G0～G255.Each GTG all has a corresponding liquid crystal deflection voltage, by S-COF (Source-Chip on
Film, source electrode membrane of flip chip) produce.
In order to improve the display effect of display, 8bit (8) data of system board input, TCON can be first passed through
Dithering (shake display) module in (Timing Controller, time schedule controller) is converted to 10bit (10), then
According to white balance (index of white degree of accuracy after the mixing of red, green, blue three primary colours generates in description), 10bit (10)
In select 8bit (8) data of needs, output is to S-COF.
In the application such as high refreshing frequency, for ensureing charging effect, the maximum that system gray scale voltage is corresponding, have no idea
Reduce, S-COF temperature can be caused too high, cause bad, ultimately result in display effect and be deteriorated.
Summary of the invention
For above-mentioned the problems of the prior art, present applicant proposes the driving dress of a kind of Thin Film Transistor-LCD
Put and driving method.
The present invention is to solve in prior art, and under high refreshing frequency, system GTG voltage max cannot reduce, S-
COF temperature is too high, and then causes the problem of display effect difference, now provides the driving means of a kind of Thin Film Transistor-LCD
And driving method.
A kind of driving means of Thin Film Transistor-LCD, this device includes with lower unit:
GTG judging unit: choose the middle grey decision-making of display system, and current gray value is entered with this middle grey decision-making
Row compares；
Voltage output unit: for when current gray value is less than middle grey decision-making, reducing corresponding to current gray value
Gate turn-on voltage.
Preferably, above-mentioned voltage output unit is additionally operable to:
When current gray value is more than middle grey decision-making, gate turn-on voltage keeps constant.
Preferably, above-mentioned GTG judging unit specifically includes with lower module:
GTG acquisition module: for gathering the grey decision-making of current picture data in time schedule controller；
Middle GTG acquisition module: be used for gathering in display system whole grey decision-making, in selecting in whole grey decision-making
Between be worth.
Preferably, above-mentioned voltage output unit includes: resistance R1, resistance R2, P-MOS pipe M1 and N-MOS pipe M2；
The gate turn-on voltage outfan of PCB is simultaneously connected with one end and the source electrode of P-MOS pipe M1 of resistance R1,
The other end of resistance R1 is simultaneously connected with one end and the drain electrode of N-MOS pipe M2 of resistance R2,
Another termination power ground of resistance R2,
The drain electrode of P-MOS pipe M1 and the source electrode of N-MOS pipe M2 simultaneously as the outfan of voltage output unit,
The grid of P-MOS pipe M1 and the grid of N-MOS pipe M2 are simultaneously connected with the control signal outfan of time schedule controller.
Preferably, the control signal outfan output logic level of above-mentioned time schedule controller, wherein,
When time schedule controller detection display picture data is low GTG, described logic level is high level,
When time schedule controller detection display picture data is high gray, described logic level is low level.
Preferably, when P-MOS pipe M1 turns on, the input voltage value V of its source electrode1For:
V1=VGH
Wherein, VGH is the gate turn-on voltage of PCB.
Preferably, when N-MOS pipe M2 turns on, the input voltage value V of its drain electrode2For:
Wherein, VGH is the gate turn-on voltage of PCB, R1For the resistance of resistance R1, R2Resistance for resistance R2.
Additionally, the present invention also provides for the driving method of above-mentioned Thin Film Transistor-LCD, comprise the following steps:
Choose the middle grey decision-making of display system, and current gray value is compared with this middle grey decision-making；
When current gray value is less than middle grey decision-making, reduce gate turn-on voltage.
Preferably, the driving method of above-mentioned a kind of Thin Film Transistor-LCD also includes:
When current gray value is more than middle grey decision-making, gate turn-on voltage keeps constant.
Preferably, in the driving method of above-mentioned a kind of Thin Film Transistor-LCD, choose the middle ash of display system
Rank value method particularly includes:
Gather the grey decision-making of current picture data in time schedule controller；
Gather whole grey decision-making in display system, select the intermediate value in whole grey decision-making.
The driving means of a kind of Thin Film Transistor-LCD of the present invention and driving method, it is provided that Yi Zhongxin
The driving architecture design of type, utilizes multiple VGH voltage, and in the low ash stage, system can use relatively low reference voltage just arranging in pairs or groups
Normal VGH voltage, the GTG needed for being obtained by white balance adjusting；In high gray section, system, by higher VGH voltage, is protected
Card charge efficiency, it is thus achieved that required GTG.The maximum of gray scale voltage can be reduced, and then to reduce S-COF heating.
The driving means of a kind of Thin Film Transistor-LCD of the present invention and driving method, it is adaptable to TFT-
LCD drives in architecture design.
Above-mentioned technical characteristic can combine in any suitable manner or be substituted, as long as can reach by the technical characteristic of equivalence
To the purpose of the present invention.
Accompanying drawing explanation
Hereinafter based on embodiment reference accompanying drawing, the present invention will be described in more detail.Wherein:
Fig. 1 is the main driving principle figure of the TFT-LCD described in background technology,
Wherein, 1-1 represents that PCB, 1-2 represent that S-COF, 1-3 represent that fan-out area, 1-4 represent that viewing area, 1-51 represent one
Number G-COF, 1-52 represent that No. two G-COF, 1-53 represent No. three G-COF；
Fig. 2 is the local circuit structural representation of display device in prior art；
Fig. 3 is the circuit diagram of the driving means of a kind of Thin Film Transistor-LCD of the present invention；
Fig. 4 is the flow chart of the driving method of a kind of Thin Film Transistor-LCD described in detailed description of the invention three；
The electrical block diagram of a kind of voltage compensating circuit of Fig. 5.
In the accompanying drawings, identical parts use identical reference.Accompanying drawing is not according to actual ratio.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is purged
It is fully described by.Obviously, described embodiment is a part of embodiment of the present invention rather than whole embodiment.
Based on the embodiment in the present invention, those of ordinary skill in the art are obtained on the premise of not making creative work
Every other embodiment, all should belong to the scope of protection of the invention.
Liquid crystal display (Liquid Crystal Display, LCD), owing to power consumption is the lowest, and has high image quality, body
Long-pending feature little, lightweight, the most extremely everybody favors, and becomes the main flow of present displays.Liquid crystal display is with thin film at present
Transistor (Thin Film Transistor, TFT) liquid crystal display is main, and its display floater generally includes the coloured silk being oppositely arranged
Film substrate, tft array substrate and the liquid crystal layer being arranged between two substrates.
The driving of display floater is to be provided scanning letter to liquid crystal display respectively by gate drivers and source electrode driver
Number and data signal, the pressure reduction between different voltage data signals and public electrode voltages causes the liquid crystal anglec of rotation not
With thus form the display of the difference of brightness, i.e. liquid crystal panel and form different GTG.In display floater, voltage data signal
And the relation curve between GTG is gamma (Gamma) curve, as a example by 8bit display floater, it can show 28=256
GTG, corresponding 256 different gamma reference voltages, gamma reference voltage is exactly that change procedure from white to black is divided into
N times idempotent part of 2.Seeing Fig. 2, the local circuit structural representation of display device in prior art, including voltage changer 11
(DC/DCConverter), time schedule controller 12 (Timing Controller, TCON), gamma voltage generator 13, source electrode drive
Dynamic device 14, gate drivers 15 and display floater 16；
Voltage changer 11 is respectively time schedule controller 12, gamma voltage generator 13, source electrode driver 14 and display surface
Plate 16 is powered (supply voltage is different, does not repeats them here), and video data is supplied to described through described time schedule controller 12
Source electrode driver 14, gamma voltage generator 13 provides one group of gamma reference voltage value (i.e. gamma curve) for source electrode driver,
Described source electrode driver 14 is that described display floater 16 carries according to power supply and this group gamma reference voltage value of voltage changer 11
For the driving voltage for showing described video data, described gate drivers 15 is for providing grid for described display floater 16
Scanning voltage.The supply voltage that described voltage changer 11 provides for described source electrode driver 14 is usually a steady state value, this perseverance
Fixed supply voltage is more than driving voltage maximum in the driving voltage corresponding to overall grey decision-making of described display floater 16, institute
State source electrode driver 14 this supply voltage is carried out dividing potential drop to produce multiple driving voltages by internal.Thus, when described display surface
When the driving voltage corresponding to overall grey-scale range during plate 16 display video material is less, power for described source electrode driver 14
Still keeping higher constant voltage so that display device has higher power consumption, similar, described voltage changer 11 is described
The supply voltage that gamma voltage generator 13 provides also is such.
In above-mentioned, GTG be by the brightest and the darkest between brightness flop, divide into some parts.So that it is defeated to carry out signal
Enter corresponding screen intensity management and control.Every digitized video all forms combined by many is put, and these points are also called pixel
(pixels), generally each pixel can present many different colors, and it is by three sub-pictures of red, green, blue (R/G/B)
Element composition.Each sub-pixel, its light source behind can show different gray scales.And GTG represents by
Dark to the stratum level of different brightness between the brightest.This intermediate level is the most, and the picture effect that can present is the finest and the smoothest.
As a example by 8bit panel (8 as panel), 8 powers of 2 can be showed, equal to 256 luminance levels, the most referred to as 256 GTGs.
Each pixel in lcd screen, the red, green, blue by different luminance levels combines, and ultimately forms different color point.Also
That is, the color change of each point on screen, is the most all to be become by the GTG of three the R/G/B sub-pixels constituting this point
Change is brought.And the change dependence of GTG is liquid crystal deflection, each GTG all has a corresponding liquid crystal deflection voltage, logical
Cross S-COF (Source-Chip on Film, source electrode membrane of flip chip) to produce.
Dithering (shake display), it is a kind of to use limited color to see than real image more polychrome by human eye
Color display mode.Add different colors carry out decorative image by random between neighbor, usual this mode by with
In the case of color is less.
During reality realizes, shake display does not increase the number of total pixel, but selects to increase each pixel
The color number that can show, so can cause picture size to increase, but picture quality also can be the most a lot.Therefore, improving
During the display effect of display, it is necessary to the conversion work of shake display module.
White balance (White Balance) is to describe white one of degree of accuracy after the mixing of red, green, blue three primary colours generates to refer to
Mark.The most popular understanding allows white imaging still for white exactly, if Bai Shibai, the image of other scenery will connect
The color vision custom of person of modern times's eye, and then make picture present the color being suitable to human eye viewing, the final picture obtaining high-quality
Image.
According to above-mentioned technical foundation, the application, in order to reduce the maximum of gray scale voltage, have employed following specific embodiment party
Formula is described in detail.
Detailed description of the invention one: illustrate present embodiment with reference to Fig. 3, a kind of film crystal described in present embodiment
The driving means of pipe liquid crystal display, this device includes with lower unit:
GTG judging unit: choose the middle grey decision-making of display system, and current gray value is entered with this middle grey decision-making
Row compares；
Voltage output unit: for when current gray value is less than middle grey decision-making, reducing gate turn-on voltage.
Above-mentioned voltage output unit is additionally operable to:
When current gray value is more than middle grey decision-making, gate turn-on voltage keeps constant.
Above-mentioned GTG judging unit specifically includes with lower module:
GTG acquisition module: for gathering the grey decision-making of current picture data in time schedule controller；
Middle GTG acquisition module: be used for gathering in display system whole grey decision-making, in selecting in whole grey decision-making
Between be worth.
Present embodiment is during actual displayed, it is assumed that in display system, whole grey decision-making are G0～G255, then in
Between grey decision-making be then G128,
When the data that TCON detects this journey output are respectively less than G128, show according to the white balance in low ash stage；
When the output data that TCON detects this journey have more than or equal to G128, show according to the white balance of high gray section
Show.
To sum up, in the low ash stage, system can use the relatively low reference voltage normal VGH voltage of collocation, by white flat
GTG needed for weighing apparatus regulation acquisition；In high gray section, system is by higher VGH voltage, it is ensured that charge efficiency, it is thus achieved that required
GTG.
Detailed description of the invention two: illustrate present embodiment with reference to Fig. 3, present embodiment is to detailed description of the invention one
The driving means of described a kind of Thin Film Transistor-LCD is described further, and described voltage output unit includes: electricity
Resistance R1, resistance R2, P-MOS pipe M1 and N-MOS pipe M2；
As it is shown on figure 3, VGH is the gate turn-on voltage produced on PCB, its value is opened more than or equal to grid needed for panel
The maximum (example: 33V) of voltage；
The resistance that Array processing procedure is formed, two resistance energy are utilized on resistance R1 and resistance R2 respectively Fan Out Area
Enough it is divided into two parts to export respectively VGH, it may be assumed that the source electrode input voltage V of P-MOS pipe1, the drain electrode input electricity of N-MOS pipe M2
Pressure V2；A is the control signal of TCON output, and OUTPUT represents the output voltage of voltage output unit.
The gate turn-on voltage outfan of PCB is simultaneously connected with one end and the source electrode of P-MOS pipe M1 of resistance R1,
The other end of resistance R1 is simultaneously connected with one end and the drain electrode of N-MOS pipe M2 of resistance R2,
Another termination power ground of resistance R2,
The drain electrode of P-MOS pipe M1 and the source electrode of N-MOS pipe M2 simultaneously as the outfan of voltage output unit,
The grid of P-MOS pipe M1 and the grid of N-MOS pipe M2 are simultaneously connected with the control signal outfan of time schedule controller.
The operation principle of above-mentioned voltage output unit is as follows:
The control signal outfan output logic level of time schedule controller, wherein,
When time schedule controller detection display picture data is low GTG, described logic level is high level,
When time schedule controller detection display picture data is high gray, described logic level is low level.
When A is logic level H (high) high level, N-MOS pipe is opened, and P-MOS pipe is closed, now OUTPUT=V2；
N-MOS pipe M2 turns on, the input voltage value V of its drain electrode2For:
Wherein, VGH is the gate turn-on voltage of PCB, R1For the resistance of resistance R1, R2Resistance for resistance R2.
When A is logic level L (low) low level, P-MOS pipe is opened, and N-MOS pipe is closed, now OUTPUT=V1。
P-MOS pipe M1 turns on, the input voltage value V of its source electrode1For:
V1=VGH
Wherein, VGH is the gate turn-on voltage of PCB.
Table 1 below such as is now utilized to illustrate:
According to resistance R1 and the ratio of resistance R2, if V1For 33V, V2For 27V, take middle GTG G127.
Table 1
| VGH | 33V | 33V |
| A | H | L |
| N-MOS manages | Open | Turn off |
| P-MOS manages | Turn off | Open |
| V1 | 0V | 27V |
| V2 | 33V | 0V |
| OUTPUT | 33V | 27V |
Detailed description of the invention three: illustrate present embodiment with reference to Fig. 4, a kind of film crystal described in present embodiment
The driving method of pipe liquid crystal display, this device comprises the following steps:
S401 chooses the middle grey decision-making of display system,
Current gray value is also compared by S402 with this middle grey decision-making, it is judged that whether current gray value is more than middle ash
Rank are worth；
S404, when current gray value is less than middle grey decision-making, reduces gate turn-on voltage.
The driving method of above-mentioned a kind of Thin Film Transistor-LCD, the method also includes:
S404 is when current gray value is more than middle grey decision-making, and gate turn-on voltage keeps constant.
The driving method of above-mentioned a kind of Thin Film Transistor-LCD, chooses middle grey decision-making concrete of display system
Method is:
Gather the grey decision-making of current picture data in time schedule controller；
Gather whole grey decision-making in display system, select the intermediate value in whole grey decision-making.
In prior art, an Application No.: disclose a kind of voltage compensating circuit in the application of 201510425554.0,
As it is shown in figure 5, in this circuit:
When the second input Input2 of power management chip detects the interior when the current frame of first gate driving signal
When accessing gate drive voltage high level VGH, the first film that the first input end Input1 of detection power management chip connects
The change in voltage duration of the source drive voltage Vs of transistor, first gate driving signal connects the grid of the first film transistor
Pole；The source electrode of the first film transistor is searched from the rising time corresponding relation with the output end voltage of power management chip
The power management chip present frame output end voltage Voutput1 that the change in voltage duration of driving voltage Vs is corresponding；According to power supply pipe
Reason chip present frame output end voltage Voutput1 size adjusts the current of the gate drive signal of the second thin-film transistor circuit
Frame or the size of next frame gate drive voltage high level VGH.In the embodiment of the present invention, when the temperature of TFT changes, when
Second input Input2 of power management chip detects the interior when the current frame grid accessed of first gate driving signal
When driving voltage changes, the first film transistor connected according to the first input end Input1 of detection power management chip
Source drive voltage Vs change in voltage duration adjust power management chip present frame output end voltage Voutput1 size, from
And adjust the present frame of the gate drive signal of the second thin-film transistor circuit or next frame gate drive voltage high level VGH
Size, according to the variations in temperature of TFT, can adjust gate drive voltage high level VGH big of the second thin-film transistor circuit
Little, compared with the gated sweep driving voltage being regulated TFT in prior art by temperature sensor monitors substrate temperature, implement
The embodiment of the present invention, can change according to TFT temperature, adjusts the gated sweep driving voltage high level VGH of TFT in real time, improves
The Showing Effectiveness On Screen of AMLCD.
In above-mentioned disclosure, change according to TFT temperature, adjust the gated sweep driving voltage high level VGH of TFT,
Do not disclose in the application by gate turn-on voltage VGH that produces on PCB in fanout area the divider resistance ground connection via two concatenations,
And controlled by suspension control signal A, the selector that is made up of the metal-oxide-semiconductor of two opposite polarities selects output VGH1 or through dividing potential drop
The technical characteristic of VGH2, the application possesses creativeness.
It should be understood that and can combine different appurtenances by being different from original claim manner described
Profit requires and feature specifically described herein.Will also be appreciated that combining the feature described by independent embodiment can use
In other described embodiments.
Claims (10)
1. the driving means of a Thin Film Transistor-LCD, it is characterised in that including:
GTG judging unit, for choosing the middle grey decision-making of display system, and enters current gray value with this middle grey decision-making
Row compares；
Voltage output unit, for when current gray value is less than middle grey decision-making, reducing the grid corresponding to current gray value
Cut-in voltage.
Driving means the most according to claim 1, it is characterised in that described voltage output unit is additionally operable to:
When current gray value is more than middle grey decision-making, gate turn-on voltage keeps constant.
Driving means the most according to claim 1, it is characterised in that described GTG judging unit includes:
GTG acquisition module, for gathering the grey decision-making of current picture data in time schedule controller；
Middle GTG acquisition module, is used for gathering in display system whole grey decision-making, selects the intermediate value in whole grey decision-making.
Driving means the most according to claim 1, it is characterised in that described voltage output unit includes: resistance R1, resistance
R2, P-MOS pipe M1 and N-MOS pipe M2；
The gate turn-on voltage outfan of PCB is simultaneously connected with one end and the source electrode of described P-MOS pipe M1 of described resistance R1,
The other end of described resistance R1 is simultaneously connected with one end and the drain electrode of described N-MOS pipe M2 of described resistance R2,
Another termination power ground of described resistance R2,
The drain electrode of described P-MOS pipe M1 and the source electrode of described N-MOS pipe M2 simultaneously as the outfan of described voltage output unit,
The grid of described P-MOS pipe M1 and the grid of described N-MOS pipe M2 are simultaneously connected with the control signal output of time schedule controller
End.
Driving means the most according to claim 4, it is characterised in that the control signal outfan of described time schedule controller is defeated
Go out logic level, wherein,
When described time schedule controller detection display picture data is low GTG, described logic level is high level,
When described time schedule controller detection display picture data is high gray, described logic level is low level.
Driving means the most according to claim 4, it is characterised in that when described P-MOS pipe M1 turns on, its source electrode defeated
Enter magnitude of voltage V1For:
V1=VGH
Wherein, VGH is gate turn-on voltage.
Driving means the most according to claim 4, it is characterised in that when described N-MOS pipe M2 turns on, it is defeated that it drains
Enter magnitude of voltage V2For:
Wherein, VGH is gate turn-on voltage, R1For the resistance of described resistance R1, R2Resistance for described resistance R2.
8. the driving method of a Thin Film Transistor-LCD, it is characterised in that comprise the following steps:
Choose the middle grey decision-making of display system, and current gray value is compared with this middle grey decision-making；
When current gray value is less than middle grey decision-making, reduce gate turn-on voltage.
Driving method the most according to claim 8, it is characterised in that the method also includes:
When current gray value is more than middle grey decision-making, gate turn-on voltage keeps constant.
Driving method the most according to claim 8, it is characterised in that choose the middle grey decision-making of display system, wherein:
Gather the grey decision-making of current picture data in time schedule controller；
Gather whole grey decision-making in display system, select the intermediate value in whole grey decision-making.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106710558A (en) * | 2017-02-28 | 2017-05-24 | 深圳市华星光电技术有限公司 | Driving circuit and liquid crystal display device |
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