CN105957486B - Display panel, drive circuit and display panel - Google Patents
Display panel, drive circuit and display panel Download PDFInfo
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- CN105957486B CN105957486B CN201610524875.0A CN201610524875A CN105957486B CN 105957486 B CN105957486 B CN 105957486B CN 201610524875 A CN201610524875 A CN 201610524875A CN 105957486 B CN105957486 B CN 105957486B
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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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- 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)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention provides a kind of display panel, drive circuit, including GAMMA chips, selection circuit, sequential control circuit and display circuit, first output end of the GAMMA chips and the first input end of selection circuit are electrically connected, and the first GAMMA voltages are exported to the first input end of selection circuit, the second output terminal of the GAMMA chips exports the 2nd GAMMA voltages to the second input terminal of selection circuit, the control terminal of the sequential control circuit and the selection circuit is electrically connected, and outputs level signals are to the control terminal of selection circuit, the selection circuit receives the level signal, and driving voltage is generated based on the level signal, the output end of the selection circuit is electrically connected with the display circuit, and outputting drive voltage is to the display circuit.The virtual value that driving circuit and display panel provided by the invention can change driving voltage in input display circuit improves the color offset phenomenon of display panel to adjust the display brightness of display circuit, promotes the imaging effect of display panel.
Description
Technical field
The present invention relates to liquid crystal display control technology fields, and in particular to a kind of display panel, drive circuit and display surface
Plate.
Background technology
With the progress of electronics technology, especially portable electronic product in daily life is universal, for it is light and short,
The demand of the low display device of power consumption is growing day by day.Liquid crystal display panel (Liquid Crystal Display, LCD)
Device suitable for such electronic product, or even gradually takes since it has many advantages, such as that low power consumption, thickness are thin, light-weight
For traditional CRT Displays panel device.
There are multiple pixel units, wherein each pixel unit has red, green and blue three on liquid crystal display panel
The sub-pixel of kind different colours, that is, each pixel unit is made of red bluish-green (RGB) three primary colors, each face in each pixel
Color is a sub-pixel.The brightness that each sub-pixel is presented is determined by Gamma (gamma) reference voltage in driving circuit
Fixed.
Currently, the Gamma reference voltages generated in driving circuit provide an identical Gamma ginseng to each sub-pixel
Voltage is examined, and is charged to it, to show each sub-pixel.However, using identical Gamma reference voltages to it is red,
The sub-pixel of three kinds of colors of green and blue charges, and the charging time shortens, it is possible to cause the sub-pixel of three kinds of colors
Display brightness it is different, eventually lead to liquid crystal display panel and generate colour cast, seriously affected the imaging of the liquid crystal display panel
Effect and picture quality.
Invention content
For problems of the prior art, colour cast can be improved the purpose of the present invention is to provide one kind, and can be with
Promote the display panel, drive circuit of display effect and picture quality.
In addition, another object of the present invention is to provide a kind of display panels using above-mentioned display panel, drive circuit.
To achieve the goals above, embodiment of the present invention provides the following technical solutions：
The present invention provides a kind of display panel, drive circuit, including GAMMA chips, selection circuit, sequential control circuit and
Display circuit, the first output end of the GAMMA chips and the first input end of the selection circuit are electrically connected, and export the
One GAMMA voltages are to the first input end of the selection circuit, the second output terminals of the GAMMA chips and the selection circuit
The second input terminal be electrically connected, and export the 2nd GAMMA voltages to the second input terminal of the selection circuit, the sequential control
The control terminal of circuit processed and the selection circuit is electrically connected, and outputs level signals are to the control terminal of the selection circuit, institute
It states selection circuit and receives the level signal, and driving voltage, the output end of the selection circuit are generated based on the level signal
It is electrically connected with the display circuit, and exports the driving voltage to the display circuit.
Wherein, the selection circuit includes the first field-effect transistor and the second field-effect transistor, first effect
The drain electrode of transistor is answered to be electrically connected the first output end of the GAMMA chips, the source electrode of first field-effect transistor is electrically connected
It is connected to the display circuit, the source electrode of second field-effect transistor is electrically connected the second output terminal of the GAMMA chips, institute
The drain electrode for stating the second field-effect transistor is electrically connected to the display circuit, first field-effect transistor and second described
The grid of effect transistor is electrically connected the sequential control circuit.
Wherein, first field-effect transistor is NMOS transistor, and second field-effect transistor is PMOS crystal
Pipe；When the sequential control circuit output high level, the NMOS transistor conducting and PMOS transistor cut-off；When described
When sequence control circuit exports low level, then the NMOS transistor cut-off and PMOS transistor conducting.
Wherein, the sequential control circuit exports high level, the driving electricity of the output end output of the selection circuit
Pressure is the first GAMMA voltages；The sequential control circuit exports low level, the institute of the output end output of the selection circuit
It is the 2nd GAMMA voltages to state driving voltage.
Wherein, the level signal of the sequential control circuit output is a pulse signal.
Wherein, the duty ratio of the level signal is d, and the first GAMMA voltages are Va, the 2nd GAMMA voltages
For Vb, then it is Va*d+ (1-d) * Vb to have the driving voltage virtual value.
Wherein, the display panel, drive circuit further includes filter circuit, and the filter circuit is connected to the display electricity
Between road and the output end of the selection circuit.
Wherein, the filter circuit is filter capacitor.
Wherein, comprising for storing the first GAMMA voltages and the 2nd GAMMA voltages in the GAMMA chips
Buffer.
The present invention provides a kind of display panel, wherein including the display surface described in liquid crystal display and above-mentioned any one
Drive circuit.
The embodiment of the present invention has the following advantages that or advantageous effect：
In the present invention, two different GAMMA voltages are inputted for same display circuit, and passes through sequential control circuit
The GAMMA voltages different with selection circuit pair two are adjusted, so change input display circuit in driving voltage it is effective
Value, to adjust the display brightness of display circuit, improves the color offset phenomenon of display panel, promotes the imaging effect of display panel.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the circuit block diagram of the display panel, drive circuit of the embodiment of the present invention.
Fig. 2 is the circuit diagram of the display panel, drive circuit of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiments shall fall within the protection scope of the present invention.
In addition, the explanation of following embodiment is referred to the additional illustration, to illustrate the spy that the present invention can be used to implement
Determine embodiment.Direction terms mentioned in the present invention, for example, "upper", "lower", "front", "rear", "left", "right", "inner",
"outside", " side " etc. are only the directions with reference to annexed drawings, and therefore, the direction term used is to more preferably, more clearly say
It is bright and understand the present invention, rather than indicate or imply signified device or element must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, and can also be detachably connected, or integrally connect for example, it may be being fixedly connected
It connects；It can be mechanical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The connection in portion.For the ordinary skill in the art, the tool of above-mentioned term in the present invention can be understood with concrete condition
Body meaning.
In addition, in the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.If this
The term for occurring " process " in specification, refers not only to independent process, when can not clearly be distinguished with other process, as long as
It can realize that the effect desired by the process is then also included in this term.In addition, the numerical value model indicated with "~" in this specification
It refers to the range that "~" front and back numerical value recorded is included as minimum value and maximum value to enclose.In the accompanying drawings, structure
Similar or identical is indicated by the same numeral.
Under normal conditions, human eye is to the sensitivity of the brightness change not linear change with the enhancing of brightness.Dark
In the case of, increasing a little brightness will by human eye sensitivity identify (there is smaller incident ray in such as total darkness environment i.e.
Can be had soon found that), i.e., when brightness is relatively low, human eye is very sensitive to brightness change.However, when light continues to reinforce, arrive higher
After brightness, human eye just becomes very blunt to the reaction of brightness change, and brightness improves again, will not feel bright very much.People
Eye is to " gamma curve " that this " response curve " of light variation is exactly human eye
Due to the above-mentioned visual characteristic of human eye, display equipment is during display, it is necessary to show the brightness of color into
Row is adjusted, to make human eye obtain best display effect.As long as that is to defeated on the corresponding data line of each sub-pixel
Go out the driving voltage of corresponding grayscale, different subpixel can be reached and show different grayscale, to reduce the purpose of colour cast.
Referring to Fig. 1, Fig. 1 is the circuit block diagram of the display panel, drive circuit of the embodiment of the present invention.The display of the present invention
Panel drive circuit 100 includes：GAMMA (gamma) chip 10, selection circuit 20, sequential control circuit (Timing
Controller, TCON) 30 and display circuit 40.Wherein, the GAMMA chips 10, the selection circuit 20 and the display
Circuit 40 is electrically connected successively, and the sequential control circuit 30 is electrically connected with the selection circuit 20.
It is the circuit diagram of the display panel, drive circuit of the embodiment of the present invention also referring to Fig. 2, Fig. 2.It is described
GAMMA chips 10 include the first output end 11 and second output terminal 12, first output end 11 and the second output terminal 12
It is electrically connected with the selection circuit 20.The GAMMA chips 10 are for generating the first GAMMA voltages Va and the 2nd GAMMA electricity
Vb is pressed, and the first GAMMA voltages Va and the 2nd GAMMA voltages Vb are transmitted to the selection circuit 20.It is understood that
First GAMMA voltages Va and the 2nd GAMMA voltages Vb are unequal.
The selection circuit 20 includes first input end 21, the second input terminal 22, control terminal 23 and output end 24.Described
One input terminal 21 is electrically connected with first output end 11, and second input terminal 22 electrically connects with the second output terminal 12
It connects.The first GAMMA voltages Va is transmitted to the first input end 21 of the selection circuit 20, institute by first output end 11
It is second defeated to the selection circuit 20 to state second output terminal 12 outputs of the 2nd GAMMA voltages Vb by the GAMMA chips 10
Enter end 22.
In an embodiment of the present invention, the sequential control circuit 30 and the control terminal 23 of the selection circuit 20 electrically connect
It connects, and outputs level signals, to the control terminal 23 of the selection circuit 20, the selection circuit 20 receives the level signal, and
Driving voltage Vc is generated based on the level signal.The output end 24 of the selection circuit 20 exports the driving voltage Vc to described
Display circuit 40.It is understood that the driving voltage Vc at a certain moment can be the first GAMMA voltages Va or second
GAMMA voltages Vb.Further specifically, when the sequential control circuit 30 export high level when, the selection circuit 20 it is defeated
The driving voltage Vc that outlet 24 exports is the first GAMMA voltages Va；When timing control electricity 30 exports low level
When, the driving voltage Vc that the output end 24 of the selection circuit 20 exports is the 2nd GAMMA voltages Vb.
In a specific embodiment of the invention, the selection circuit 20 includes the first field-effect transistor T1 and second
The drain electrode (i.e. first input end 21) of effect transistor T2, the first field-effect transistor T1 are electrically connected the GAMMA chips
The source electrode (i.e. output end 24) of 10 the first output end 11, the first field-effect transistor T1 is electrically connected to the display circuit
40.It is second defeated to be electrically connected the GAMMA chips 10 for the source electrode (i.e. the second input terminal 22) of the second field-effect transistor T2
The drain electrode (i.e. output end 24) of outlet 12, the second field-effect transistor T2 is electrically connected to the first field-effect transistor T1
Source electrode, and be electrically connected to the display circuit 40, the first field-effect transistor T1 and second field-effect transistor
The grid (i.e. control terminal 23) of T2 is electrically connected the sequential control circuit 30 jointly, that is, the first field-effect transistor T1 and
The grid of the second field-effect transistor T2 common gates, the two forms the control terminal 23, and is electrically connected by the control terminal 23
It is connected to the sequential control circuit 30.
It is further preferred that the first field-effect transistor T1 is NMOS transistor, second field-effect transistor
T2 is PMOS transistor.It is understood that when the sequential control circuit 30 exports high level, first field-effect is brilliant
Body pipe T1 is connected and the second field-effect transistor T2 ends, therefore the output of output end 24 first of the selection circuit 20
GAMMA voltages Va；When the sequential control circuit 30 exports low level, the first field-effect transistor T1 cut-off at this time and
The second field-effect transistor T2 is connected, then the output end 24 of the selection circuit 20 exports the 2nd GAMMA voltages Vb.
It is understood that the display circuit 40 includes multiple thin film transistor (TFT)s, and each thin film transistor (TFT) corresponds to
One sub-pixel.The driving voltage Vc is for charging to the thin film transistor (TFT) in the display circuit 40.
Preferably, the level signal that the sequential control circuit 30 exports is a pulse signal.If the pulse (level)
The duty ratio of signal is d, then in a pulse signal cycle, the virtual value U of the driving voltage Vc meets：U=Va*d+
(1-d)*Vb.In a specific embodiment of the invention, the first GAMMA voltages Va can be to input the display circuit 40
Driving voltage the upper limit, the 2nd GAMMA voltages Vb is the lower limit of the driving voltage of the input display circuit 40, namely
It is to say, the virtual value of the driving voltage is more than or equal to the 2nd GAMMA voltages Vb and is less than or equal to the first GAMMA voltages Va.By
This can be seen that the duty ratio by adjusting the level signal that the sequential control circuit 30 exports, and can adjust and be input to institute
The virtual value of the driving voltage of display circuit 40 is stated, and then reaches the brightness for adjusting the display circuit 40, improves display panel
The technique effect of colour cast.
In a specific embodiment of the invention, for having in the display circuit 40：Va=3V, Vb=1V, d=0.5,
At this point, by the calculation formula of the virtual value U of above-mentioned driving voltage Vc it is found that red sub-pixel, blue subpixels and the sub- picture of green
The driving voltage virtual value of element is all 2V, then in the case where the driving voltage virtual value is 2V, in the display circuit 40
Green sub-pixels are partially bright, and red sub-pixel and blue sub-pixel luminence are normal.At this time, it may be necessary to turn down the driving electricity of green sub-pixels
It is pressed with valid value, and then reduces the brightness of green sub-pixels, it may therefore be assured that Va, Vb of red sub-pixel and blue subpixels
It is remained unchanged with d, adjusts the duty ratio d of the corresponding pulse signal of green sub-pixels；For example, so that green sub-pixels pair after adjusting
The duty ratio d=0.2 for the pulse signal answered, it is by the calculation formula of the virtual value U of above-mentioned driving voltage Vc it is found that then green at this time
The driving voltage virtual value of sub-pixel becomes 1.4V, therefore the brightness of green sub-pixels declines so that the brightness of each sub-pixel
Uniformly, so as to improve color offset phenomenon.
In the present invention, two different GAMMA voltages are inputted for same display circuit, and passes through the timing control
Circuit and the different GAMMA voltages of selection circuit pair two are adjusted, and GAMMA in the display circuit is input to change
The virtual value of voltage to adjust the brightness of the display circuit, and improves the color offset phenomenon of display panel, and then promotes display
The imaging effect and picture quality of panel.
Further, the display panel, drive circuit 100 further includes filter circuit 50, the filter circuit 50 and the choosing
The output end 24 for selecting circuit 20 is electrically connected, and the selection circuit 20 is connected to display circuit 40 after the filter circuit 50,
That is, the filter circuit 50 is connected between the display circuit 40 and the output end 24 of the selection circuit 20.Pass through filtering
The driving voltage of output is filtered into steady dc voltage by circuit 50, ensure that the stability of input 40 voltage of display circuit.
Preferably, the filter circuit 50 is a filter capacitor C.
Further, the GAMMA voltage values for inputting the display circuit 40 are stored in the form of document code
In memory inside GAMMA chips 10, such as EEPROM, when the GAMMA chips 10 need to export GAMMA voltages, from
EEPROM calls code to be put into buffer, then the output of GAMMA voltage values is read from buffer, in the embodiment of the present application, is
Guarantee switch speed, can write direct buffer by the first GAMMA voltage values and the 2nd GAMMA voltage values
In, it thus eliminates buffer and calls time spent by code in EEPROM, greatly shorten the GAMMA chips
10 switch speed.
It is understood that the GAMMA chips 10 and the sequential control circuit 30 can be integrated in same printing electricity
In road plate (Printed Circuit Board, PCB).
Based on above-mentioned display panel, drive circuit 100, the present invention also provides a kind of display panel, display panel of the invention
Including the display panel, drive circuit 100 provided in liquid crystal display and above-described embodiment.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means particular features, structures, materials, or characteristics described in conjunction with this embodiment or example
It is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms differ
Surely identical embodiment or example are referred to.Moreover, the particular features, structures, materials, or characteristics of description can be any one
It can be combined in any suitable manner in a or multiple embodiments or example.
Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (8)
1. a kind of display panel, drive circuit, which is characterized in that including GAMMA chips, selection circuit, sequential control circuit and show
Show that circuit, the first output end of the GAMMA chips are electrically connected with the first input end of the selection circuit, and exports first
GAMMA voltages are to the first input end of the selection circuit, the second output terminals of the GAMMA chips and the selection circuit
Second input terminal is electrically connected, and exports the 2nd GAMMA voltages to the second input terminal of the selection circuit, the timing control
The control terminal of circuit and the selection circuit is electrically connected, and outputs level signals are to the control terminal of the selection circuit, described
Selection circuit receives the level signal, and generates driving voltage based on the level signal, the output end of the selection circuit with
The display circuit is electrically connected, and exports the driving voltage to the display circuit；Wherein,
The level signal of sequential control circuit output is a pulse signal, and the duty ratio of the level signal is d, described the
One GAMMA voltages are Va, and the 2nd GAMMA voltages are Vb, then it is Va*d+ (1-d) * Vb to have the driving voltage virtual value.
2. display panel, drive circuit as described in claim 1, which is characterized in that the selection circuit includes the first field-effect
Transistor and the second field-effect transistor, the drain electrode of first field-effect transistor are electrically connected the first of the GAMMA chips
The source electrode of output end, first field-effect transistor is electrically connected to the display circuit, second field-effect transistor
Source electrode is electrically connected the second output terminal of the GAMMA chips, and the drain electrode of second field-effect transistor is electrically connected to described show
Show circuit, the grid electrical connection timing control electricity of first field-effect transistor and second field-effect transistor
Road.
3. display panel, drive circuit as claimed in claim 2, which is characterized in that first field-effect transistor is NMOS
Transistor, second field-effect transistor are PMOS transistor；When the sequential control circuit output high level, the NMOS
Transistor turns and PMOS transistor cut-off；When sequential control circuit output low level, then the NMOS transistor
Cut-off and PMOS transistor conducting.
4. display panel, drive circuit as described in claim 1, which is characterized in that the high electricity of sequential control circuit output
Flat, the driving voltage of the output end output of the selection circuit is the first GAMMA voltages；The sequential control circuit
Low level is exported, the driving voltage of the output end output of the selection circuit is the 2nd GAMMA voltages.
5. display panel, drive circuit as described in claim 1, which is characterized in that the display panel, drive circuit further includes
Filter circuit, the filter circuit are connected between the display circuit and the output end of the selection circuit.
6. display panel, drive circuit as claimed in claim 5, which is characterized in that the filter circuit is filter capacitor.
7. display panel, drive circuit as described in claim 1, which is characterized in that comprising for depositing in the GAMMA chips
Store up the buffer of the first GAMMA voltages and the 2nd GAMMA voltages.
8. a kind of display panel, which is characterized in that including the display surface described in liquid crystal display and claim 1-7 any one
Drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610524875.0A CN105957486B (en) | 2016-07-05 | 2016-07-05 | Display panel, drive circuit and display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610524875.0A CN105957486B (en) | 2016-07-05 | 2016-07-05 | Display panel, drive circuit and display panel |
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| Publication Number | Publication Date |
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| CN105957486A CN105957486A (en) | 2016-09-21 |
| CN105957486B true CN105957486B (en) | 2018-10-23 |
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| CN201610524875.0A Active CN105957486B (en) | 2016-07-05 | 2016-07-05 | Display panel, drive circuit and display panel |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107025878B (en) * | 2017-04-25 | 2020-01-03 | 武汉华星光电技术有限公司 | Drive circuit and display device |
| CN108922487B (en) * | 2018-08-24 | 2020-06-26 | 惠科股份有限公司 | Voltage regulating circuit and display device |
| CN109062392B (en) * | 2018-09-17 | 2022-05-10 | 郑州云海信息技术有限公司 | Equipment, method and system for automatically switching power supply of server board card |
| 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 |
| CN109509416A (en) * | 2018-12-19 | 2019-03-22 | 惠科股份有限公司 | Show driving plate and display device |
| CN109448655B (en) * | 2018-12-26 | 2022-03-04 | 惠科股份有限公司 | Filter circuit and display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101227136B1 (en) * | 2005-12-30 | 2013-01-28 | 엘지디스플레이 주식회사 | Liquid crystal display of field sequential color type and method for driving the same |
| KR101285054B1 (en) * | 2006-06-21 | 2013-07-10 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN101556774A (en) * | 2008-04-10 | 2009-10-14 | 北京京东方光电科技有限公司 | Device and method for driving liquid crystal display |
| CN101872591B (en) * | 2009-04-22 | 2012-05-23 | 瑞鼎科技股份有限公司 | Overload driving device used for driving liquid crystal display panel |
| CN104103252B (en) * | 2014-06-23 | 2017-02-08 | 京东方科技集团股份有限公司 | Gamma voltage generating device, grayscale voltage generating device and display device |
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