CN106157915B - The driving device and driving method of Thin Film Transistor-LCD - Google Patents
The driving device and driving method of Thin Film Transistor-LCD Download PDFInfo
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- CN106157915B CN106157915B CN201610796946.2A CN201610796946A CN106157915B CN 106157915 B CN106157915 B CN 106157915B CN 201610796946 A CN201610796946 A CN 201610796946A CN 106157915 B CN106157915 B CN 106157915B
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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 present invention provides a kind of driving device of Thin Film Transistor-LCD and driving methods, are related to display actuation techniques field.In order to solve in the prior art, system grayscale voltage max can not reduce under high refreshing frequency, S-COF temperature is excessively high, and then lead to the problem of display effect difference, the present invention is using a kind of novel driving architecture design, using multiple VGH voltages, in the low ash stage, system can pass through the grayscale needed for white balance adjusting obtains using the normal VGH voltage of lower reference voltage collocation；In the high ash stage, system guarantees charge efficiency, obtains required grayscale by higher VGH voltage.It can reduce the maximum value of gray scale voltage, and then to reduce S-COF fever.
Description
Technical field
The invention belongs to a kind of driving of display actuation techniques field more particularly to Thin Film Transistor-LCD dresses
It sets and driving method.
Background technique
(Thin Film Transistor Liquid Crystal Display, tft liquid crystal are aobvious by TFT-LCD
Show device) it is one of the principal item that current flat panel is shown, have become modern IT, display platform important in video product.
The main driving principle of TFT-LCD, system board passes through tri- color compressed signal of R/G/B, control signal and power as shown in Figure 1:
Connector (connector) on wire rod and pcb board (print circuit board, printing plate) is connected, and data are passed through
After TCON (Timing Controller, sequence controller) IC processing on pcb board, through pcb board, pass through S-COF (Source-
Chip on Film, source electrode membrane of flip chip) and G-COF (Gate-Chip on Film, grid membrane of flip chip) and viewing area connect
It connects, so that LCD obtains required power supply, signal.
In 8bit (8) display system being widely used at present, system most bright will be divided into 256 ashes to most dark picture
Rank, it may be assumed that G0~G255.Each grayscale has a corresponding liquid crystal deflection voltage, passes through S-COF (Source-Chip on
Film, source electrode membrane of flip chip) it generates.
In order to improve the display effect of display, 8bit (8) data of system board input can first pass through TCON
Dithering (shake display) module in (Timing Controller, sequence controller) is converted to 10bit (10), then
According to white balance (Xiang Zhibiao of white accuracy after the mixing of red, green, blue three primary colours generates in description), 10bit (10)
In select 8bit (8) data of needs, export to S-COF.
In the application such as high refreshing frequency, to guarantee charging effect, the corresponding maximum value of system gray scale voltage is had no idea
It reduces, it is excessively high to will lead to S-COF temperature, causes bad, eventually leads to display effect variation.
Summary of the invention
For above-mentioned the problems of the prior art, present applicant proposes a kind of driving of Thin Film Transistor-LCD dresses
It sets and driving method.
The present invention is to solve in the prior art, and system grayscale voltage max can not reduce under high refreshing frequency, S-
COF temperature is excessively high, and then leads to the problem of display effect difference, now provides a kind of driving device of Thin Film Transistor-LCD
And driving method.
A kind of driving device of Thin Film Transistor-LCD, the device include with lower unit:
Grayscale judging unit: choosing the intermediate grayscale value of display system, and by current gray value and the intermediate grayscale value into
Row compares；
Voltage output unit: for reducing corresponding to current gray value when current gray value is less than intermediate grayscale value
Gate turn-on voltage.
Preferably, above-mentioned voltage output unit is also used to:
When current gray value is greater than intermediate grayscale value, gate turn-on voltage is remained unchanged.
Preferably, above-mentioned grayscale judging unit is specifically included with lower module:
Grayscale acquisition module: for acquiring the grayscale value of current picture data in sequence controller；
Intermediate grayscale obtains module: for acquiring whole grayscale values in display system, selecting in whole grayscale values
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 output end of PCB connects one end of resistance R1 and the source electrode of P-MOS pipe M1 simultaneously,
The other end of resistance R1 connects one end of resistance R2 and the drain electrode of N-MOS pipe M2 simultaneously,
Another termination power ground of resistance R2,
The drain electrode of P-MOS pipe M1 and the source electrode of N-MOS pipe M2 are used as the output end of voltage output unit simultaneously,
The grid of P-MOS pipe M1 and the grid of N-MOS pipe M2 connect the control signal output of sequence controller simultaneously.
Preferably, the control signal output of above-mentioned sequence controller exports logic level, wherein
When sequence controller detection display picture data is low ash rank, the logic level is high level,
When sequence controller detection display picture data is high gray, the logic level is low level.
Preferably, when P-MOS pipe M1 is connected, the input voltage value V of source electrode1Are as follows:
V1=VGH
Wherein, VGH is the gate turn-on voltage of PCB.
Preferably, when N-MOS pipe M2 is connected, the input voltage value V of drain electrode2Are as follows:
Wherein, VGH is the gate turn-on voltage of PCB, R1For the resistance value of resistance R1, R2For the resistance value of resistance R2.
In addition, the present invention also provides the driving methods of above-mentioned Thin Film Transistor-LCD, comprising the following steps:
The intermediate grayscale value of display system is chosen, and current gray value and the intermediate grayscale value are compared；
When current gray value is less than intermediate grayscale value, gate turn-on voltage is reduced.
Preferably, the driving method of above-mentioned a kind of Thin Film Transistor-LCD further include:
When current gray value is greater than intermediate grayscale value, gate turn-on voltage is remained unchanged.
Preferably, in a kind of driving method of above-mentioned Thin Film Transistor-LCD, the intermediate ash of display system is chosen
Rank value method particularly includes:
Acquire the grayscale value of current picture data in sequence controller；
Whole grayscale values in display system are acquired, the median in whole grayscale values is selected.
The driving device and driving method of a kind of Thin Film Transistor-LCD of the present invention provide a kind of new
The driving architecture design of type, using multiple VGH voltages, in the low ash stage, system can be using the collocation of lower reference voltage just
Normal VGH voltage, the grayscale needed for being obtained by white balance adjusting；In the high ash stage, system is protected by higher VGH voltage
Charge efficiency is demonstrate,proved, required grayscale is obtained.It can reduce the maximum value of gray scale voltage, and then to reduce S-COF fever.
The driving device and driving method of a kind of Thin Film Transistor-LCD of the present invention are suitable for TFT-
LCD drives in architecture design.
Above-mentioned technical characteristic may be combined in various suitable ways or be substituted by equivalent technical characteristic, as long as can reach
To the purpose of the present invention.
Detailed description of the invention
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein:
Fig. 1 is the main driving principle figure of TFT-LCD described in background technology,
Wherein, 1-1 indicates that PCB, 1-2 indicate that S-COF, 1-3 indicate fan-out area, and 1-4 indicates viewing area, and 1-51 indicates one
Number G-COF, 1-52 indicate that No. two G-COF, 1-53 indicate No. three G-COF；
Fig. 2 is the local circuit structural schematic diagram of display device in the prior art；
Fig. 3 is a kind of circuit diagram of the driving device of Thin Film Transistor-LCD of the present invention；
Fig. 4 is a kind of flow chart of the driving method of Thin Film Transistor-LCD described in specific embodiment three；
A kind of electrical block diagram of voltage compensating circuit of Fig. 5.
In the accompanying drawings, identical component uses identical appended drawing reference.Attached drawing is not according to actual ratio.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Below in conjunction with the attached drawing in embodiment of the present invention, the technical solution in embodiment of the present invention is purged
It is fully described by.Obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.
Based on the embodiment in the present invention, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, all should belong to the scope of protection of the invention.
Liquid crystal display (Liquid Crystal Display, LCD) since power consumption is very low, and has high image quality, body
Small, the light-weight feature of product, therefore favored by everybody, become the mainstream of present displays.Liquid crystal display is at present with film
Based on transistor (Thin Film Transistor, TFT) liquid crystal display, display panel generally includes the coloured silk being oppositely arranged
Ilm substrate, tft array substrate and the liquid crystal layer being set between two substrates.
The driving of display panel is to provide scanning letter to liquid crystal display respectively from gate drivers and source electrode driver
Number and data-signal, pressure difference between different voltage data signals and public electrode voltages cause liquid crystal rotation angle not
With the difference to form brightness, i.e. the display of liquid crystal display panel forms different grayscale.In display panel, voltage data signal
Relation curve between grayscale is gamma (Gamma) curve, by taking 8bit display panel as an example, can show 28=256
Grayscale, corresponding 256 different gamma reference voltages, gamma reference voltage is exactly that change procedure from white to black is divided into
2 n times idempotent part.Referring to fig. 2, the local circuit structural schematic diagram of display device, including voltage changer 11 in the prior art
(DC/DCConverter), sequence controller 12 (Timing Controller, TCON), gamma voltage generator 13, source electrode drive
Dynamic device 14, gate drivers 15 and display panel 16；
Voltage changer 11 is respectively sequence controller 12, gamma voltage generator 13, source electrode driver 14 and display surface
Plate 16 is powered (supply voltage is different, and details are not described herein), and video data is supplied to described through the sequence controller 12
Source electrode driver 14, gamma voltage generator 13 provide one group of gamma reference voltage value (i.e. gamma curve) for source electrode driver,
The source electrode driver 14 is that the display panel 16 mentions according to the power supply and this group of gamma reference voltage value of voltage changer 11
For for showing that the driving voltage of the video data, the gate drivers 15 are used to provide grid for the display panel 16
Scanning voltage.The voltage changer 11 is that the supply voltage that the source electrode driver 14 provides is usually a steady state value, the perseverance
Fixed supply voltage is greater than maximum driving voltage in driving voltage corresponding to the whole grayscale value of the display panel 16, institute
It states source electrode driver 14 and the multiple driving voltages of partial pressure generation is carried out to the supply voltage by internal.As a result, when the display surface
When driving voltage corresponding to whole grey-scale range when 16 display video material of plate is smaller, power for the source electrode driver 14
Higher constant voltage is still kept, so that display device power consumption with higher, similar, the voltage changer 11 is described
The supply voltage that gamma voltage generator 13 provides is also such.
Among the above, grayscale be by it is most bright with it is most dark between brightness change, divide into several pieces.It is defeated in order to carry out signal
Enter corresponding screen intensity control.Every digitized video be all as combined by many points made of, these point be also known as pixel
(pixels), usually each pixel can show many different colors, it is by three sub- pictures of red, green, blue (R/G/B)
Element composition.The light source of each sub-pixel, behind can show different gray scales.And grayscale is represented by most
The dark stratum level to different brightness between most bright.This intermediate level is more, and the picture effect that can be presented is also finer and smoother.
By taking 8bitpanel (8 be panel) as an example, 28 powers can be showed, are equal to 256 luminance levels, just referred to as 256 grayscale.LCD
Each pixel on screen, is combined by the red, green, blue of different luminance levels, ultimately forms different color points.Namely
It says, the color change that each is put on screen, is all the gray scale variation institute by constituting three R/G/B sub-pixels of this point in fact
Bring.And what the variation of grayscale relied on is liquid crystal deflection, each grayscale has a corresponding liquid crystal deflection voltage, passes through S-
COF (Source-Chip on Film, source electrode membrane of flip chip) is generated.
Dithering (shake display), it is a kind of to see the more polychrome than real image by human eye using limited color
Color display mode.By the different color of random addition between adjacent pixel come decorative image, usual this mode by with
In the case that color is less.
In the actual implementation process, shake display does not increase the number of total pixel, but selects to increase each pixel
The color number that can be shown will cause picture size increase in this way, but picture quality also can be well very much.Therefore, improving
During the display effect of display, it is necessary to shake the conversion work of display module.
White balance (White Balance) is that one of white accuracy after describing the mixing generation of red, green, blue three primary colours refers to
Mark.Most popular understanding is exactly that white imaging is allowed still to be white, if Bai Shibai, the image of other scenery will be connect
The color vision habit of person of modern times's eye finally obtains good picture so that picture shows the color suitable for human eye viewing
Image.
According to above-mentioned technical foundation, the application uses following specific embodiment parties to reduce the maximum value of gray scale voltage
Formula is described in detail.
Specific embodiment 1: illustrating present embodiment, a kind of film crystal described in present embodiment referring to Fig. 3
The driving device of pipe liquid crystal display, the device include with lower unit:
Grayscale judging unit: choosing the intermediate grayscale value of display system, and by current gray value and the intermediate grayscale value into
Row compares；
Voltage output unit: for reducing gate turn-on voltage when current gray value is less than intermediate grayscale value.
Above-mentioned voltage output unit is also used to:
When current gray value is greater than intermediate grayscale value, gate turn-on voltage is remained unchanged.
Above-mentioned grayscale judging unit is specifically included with lower module:
Grayscale acquisition module: for acquiring the grayscale value of current picture data in sequence controller；
Intermediate grayscale obtains module: for acquiring whole grayscale values in display system, selecting in whole grayscale values
Between be worth.
Present embodiment is during actual displayed, it is assumed that and whole grayscale values are G0~G255 in display system, then in
Between grayscale value be then G128,
When the data that TCON detects this journey output are respectively less than G128, shown according to the white balance in low ash stage；
It is aobvious according to the white balance in high ash stage when the output data that TCON detects this journey has more than or equal to G128
Show.
To sum up, in the low ash stage, system can be using the normal VGH voltage of lower reference voltage collocation, by white flat
Weighing apparatus adjusts the grayscale needed for obtaining；In the high ash stage, system is guaranteed charge efficiency, is obtained required by higher VGH voltage
Grayscale.
Specific embodiment 2: illustrating present embodiment referring to Fig. 3, present embodiment is to specific embodiment one
A kind of driving device of Thin Film Transistor-LCD is described further, and the voltage output unit includes: electricity
Hinder R1, resistance R2, P-MOS pipe M1 and N-MOS pipe M2；
As shown in figure 3, VGH is the gate turn-on voltage generated on PCB, grid needed for value is greater than or equal to panel is opened
The maximum value (example: 33V) of voltage；
Resistance R1 and resistance R2 is respectively the resistance formed on Fan OutArea using Array processing procedure, and two resistance can
VGH is divided and is exported respectively for two parts, it may be assumed that the source electrode input voltage V of P-MOS pipe1, the drain electrode input voltage of N-MOS pipe M2
V2；A is the control signal of TCON output, and OUTPUT indicates the output voltage of voltage output unit.
The gate turn-on voltage output end of PCB connects one end of resistance R1 and the source electrode of P-MOS pipe M1 simultaneously,
The other end of resistance R1 connects one end of resistance R2 and the drain electrode of N-MOS pipe M2 simultaneously,
Another termination power ground of resistance R2,
The drain electrode of P-MOS pipe M1 and the source electrode of N-MOS pipe M2 are used as the output end of voltage output unit simultaneously,
The grid of P-MOS pipe M1 and the grid of N-MOS pipe M2 connect the control signal output of sequence controller simultaneously.
The working principle of above-mentioned voltage output unit is as follows:
The control signal output of sequence controller exports logic level, wherein
When sequence controller detection display picture data is low ash rank, the logic level is high level,
When sequence controller detection display picture data is high gray, the 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, at this time OUTPUT=V2；
N-MOS pipe M2 conducting, the input voltage value V of drain electrode2Are as follows:
Wherein, VGH is the gate turn-on voltage of PCB, R1For the resistance value of resistance R1, R2For the resistance value of resistance R2.
When A is logic level L (low) low level, P-MOS pipe is opened, and N-MOS pipe is closed, at this time OUTPUT=V1。
P-MOS pipe M1 conducting, the input voltage value V of source electrode1Are as follows:
V1=VGH
Wherein, VGH is the gate turn-on voltage of PCB.
Now it is illustrated using such as the following table 1:
According to the ratio of resistance R1 and resistance R2, if V1For 33V, V2For 27V, intermediate grayscale G127 is taken.
Table 1
| VGH | 33V | 33V |
| A | H | L |
| N-MOS pipe | It opens | Shutdown |
| P-MOS pipe | Shutdown | It opens |
| V1 | 0V | 27V |
| V2 | 33V | 0V |
| OUTPUT | 33V | 27V |
Specific embodiment 3: illustrating present embodiment, a kind of film crystal described in present embodiment referring to Fig. 4
The driving method of pipe liquid crystal display, the device the following steps are included:
S401 chooses the intermediate grayscale value of display system,
Current gray value and the intermediate grayscale value are simultaneously compared by S402, judge whether current gray value is greater than intermediate ash
Rank value；
S404 reduces gate turn-on voltage when current gray value is less than intermediate grayscale value.
A kind of driving method of above-mentioned Thin Film Transistor-LCD, this method further include:
When current gray value is greater than intermediate grayscale value, gate turn-on voltage remains unchanged S404.
A kind of driving method of above-mentioned Thin Film Transistor-LCD chooses the specific of the intermediate grayscale value of display system
Method are as follows:
Acquire the grayscale value of current picture data in sequence controller；
Whole grayscale values in display system are acquired, the median in whole grayscale values is selected.
In the prior art, one application No. is: a kind of voltage compensating circuit is disclosed in 201510425554.0 application,
As shown in figure 5, in the circuit:
When the second input terminal 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 of the first input end Input1 connection of power management chip is detected
The voltage change duration of the source drive voltage Vs of transistor, first gate driving signal connect the grid of first film transistor
Pole；From the source electrode for searching first film transistor in the corresponding relationship of rising time and the output end voltage of power management chip
The corresponding power management chip present frame output end voltage Voutput1 of the voltage change duration of driving voltage Vs；According to power supply pipe
Manage the current of the gate drive signal of chip present frame output end voltage Voutput1 size the second thin-film transistor circuit of adjustment
The size of frame or next frame gate drive voltage high level VGH.In the embodiment of the present invention, when the temperature of TFT changes, when
Second input terminal Input2 of power management chip detects the grid of the access interior when the current frame of first gate driving signal
When driving voltage changes, according to the first film transistor of the first input end Input1 connection of detection power management chip
Source drive voltage Vs voltage change duration adjust power management chip present frame output end voltage Voutput1 size, from
And adjust the present frame or next frame gate drive voltage high level VGH of the gate drive signal of the second thin-film transistor circuit
Size according to the temperature change of TFT, can adjust the big of the gate drive voltage high level VGH of the second thin-film transistor circuit
It is small, compared with the gated sweep driving voltage for adjusting TFT by temperature sensor monitoring substrate temperature in the prior art, implement
The embodiment of the present invention can change according to TFT temperature, adjust the gated sweep driving voltage high level VGH of TFT in real time, improve
The Showing Effectiveness On Screen of active matrix liquid crystal display.
In above-mentioned disclosure, changed according to TFT temperature, adjust the gated sweep driving voltage high level VGH of TFT,
It does not disclose in the application and is grounded the gate turn-on voltage VGH generated on PCB in the divider resistance that fanout area is concatenated via two,
And by suspension control signal A control, the selector selection output VGH1 being made of the metal-oxide-semiconductor of two opposite polarities or by dividing
VGH2 technical characteristic, the application has creativeness.
It should be understood that different appurtenances can be combined by being different from mode described in original claim
Benefit requires and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used
In other described embodiments.
Claims (10)
1. a kind of driving device of Thin Film Transistor-LCD characterized by comprising
Grayscale judging unit, for choosing the intermediate grayscale value of display system, and by current gray value and the intermediate grayscale value into
Row compares；
Voltage output unit, for reducing grid corresponding to current gray value when current gray value is less than intermediate grayscale value
Cut-in voltage；
Wherein, when the grayscale value of current picture data in sequence controller is respectively less than the intermediate grayscale value, according to low ash rank
The white balance of section is shown；When the grayscale value of current picture data in the sequence controller is greater than or equal to the intermediate grayscale value
When, it is shown according to the white balance of high gray.
2. driving device according to claim 1, which is characterized in that the voltage output unit is also used to:
When current gray value is greater than intermediate grayscale value, gate turn-on voltage is remained unchanged.
3. driving device according to claim 1, which is characterized in that the grayscale judging unit includes:
Grayscale acquisition module, for acquiring the grayscale value of current picture data in sequence controller；
Intermediate grayscale obtains module, for acquiring whole grayscale values in display system, selects the median in whole grayscale values.
4. driving device according to claim 1, which is characterized in that the voltage output unit includes: resistance R1, resistance
R2, P-MOS pipe M1 and N-MOS pipe M2；
The gate turn-on voltage output end of PCB connects one end of the resistance R1 and the source electrode of the P-MOS pipe M1 simultaneously,
The other end of the resistance R1 connects one end of the resistance R2 and the drain electrode of the N-MOS pipe M2 simultaneously,
Another termination power ground of the resistance R2,
The drain electrode of the P-MOS pipe M1 and the source electrode of the N-MOS pipe M2 while the output end as the voltage output unit,
The grid of the grid of the P-MOS pipe M1 and the N-MOS pipe M2 connect the control signal output of sequence controller simultaneously
End.
5. driving device according to claim 4, which is characterized in that the control signal output of the sequence controller is defeated
Logic level out, wherein
When sequence controller detection display picture data is low ash rank, the logic level is high level,
When sequence controller detection display picture data is high gray, the logic level is low level.
6. driving device according to claim 4, which is characterized in that when the P-MOS pipe M1 conducting when, source electrode it is defeated
Enter voltage value V1Are as follows:
V1=VGH
Wherein, VGH is gate turn-on voltage.
7. driving device according to claim 4, which is characterized in that when N-MOS pipe M2 conducting, what is drained is defeated
Enter voltage value V2Are as follows:
Wherein, VGH is gate turn-on voltage, R1For the resistance value of the resistance R1, R2For the resistance value of the resistance R2.
8. a kind of driving method of Thin Film Transistor-LCD, which comprises the following steps:
The intermediate grayscale value of display system is chosen, and current gray value and the intermediate grayscale value are compared；
When current gray value is less than intermediate grayscale value, gate turn-on voltage is reduced；
Wherein, when the grayscale value of current picture data in sequence controller is respectively less than the intermediate grayscale value, according to low ash rank
The white balance of section is shown；When the grayscale value of current picture data in the sequence controller is greater than or equal to the intermediate grayscale value
When, it is shown according to the white balance of high gray.
9. driving method according to claim 8, which is characterized in that this method further include:
When current gray value is greater than intermediate grayscale value, gate turn-on voltage is remained unchanged.
10. driving method according to claim 8, which is characterized in that choose the intermediate grayscale value of display system, in which:
Acquire the grayscale value of current picture data in sequence controller；
Whole grayscale values in display system are acquired, the median in whole grayscale values is selected.
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| 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 |
| CN106782421B (en) * | 2017-03-10 | 2019-08-13 | 深圳市华星光电技术有限公司 | Image element driving method and device |
| CN107093411B (en) | 2017-06-29 | 2019-05-07 | 深圳市华星光电技术有限公司 | Liquid crystal panel drive circuit and liquid crystal display |
| CN108389557B (en) * | 2018-03-16 | 2020-01-21 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN108962110B (en) * | 2018-08-09 | 2021-04-27 | 京东方科技集团股份有限公司 | Method for acquiring charging rate of liquid crystal panel |
| CN108922487B (en) * | 2018-08-24 | 2020-06-26 | 惠科股份有限公司 | Voltage regulating circuit and display device |
| US10854162B2 (en) | 2018-09-30 | 2020-12-01 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Gamma voltage regulation circuit, and display device |
| CN109036256B (en) * | 2018-09-30 | 2020-07-07 | 重庆惠科金渝光电科技有限公司 | Gamma voltage regulating circuit and display device |
| CN109410855B (en) * | 2018-11-08 | 2020-11-06 | 惠科股份有限公司 | Display panel and display device |
| CN109461414B (en) * | 2018-11-09 | 2020-11-06 | 惠科股份有限公司 | Driving circuit and method of display device |
| CN109256103A (en) * | 2018-11-09 | 2019-01-22 | 惠科股份有限公司 | A kind of driving circuit of display device |
| CN111369926B (en) * | 2020-03-18 | 2022-09-27 | Tcl华星光电技术有限公司 | Charging method and device for display panel |
| CN113436563B (en) * | 2021-06-03 | 2022-05-13 | 荣耀终端有限公司 | Power supply circuit, driving device and display device |
| CN113707069A (en) * | 2021-08-30 | 2021-11-26 | Tcl华星光电技术有限公司 | Time schedule controller, display terminal and display compensation method |
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