CN108682403A - Gamma electric voltage switching device and liquid crystal display device - Google Patents
Gamma electric voltage switching device and liquid crystal display device Download PDFInfo
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- CN108682403A CN108682403A CN201810404843.6A CN201810404843A CN108682403A CN 108682403 A CN108682403 A CN 108682403A CN 201810404843 A CN201810404843 A CN 201810404843A CN 108682403 A CN108682403 A CN 108682403A
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
-
- 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
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
-
- 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
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- 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
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
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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 gamma electric voltage switching device, including control switching circuit and voltage follower circuit, and control switching circuit is used to export switching signal according to the first switch-over control signal of reception and the second switch-over control signal；Voltage follower circuit includes first resistor string, multiple first switching elements, second switch element and gamma electric voltage chip, gamma electric voltage chip is according to the level of the first switch-over control signal height, second group of gamma electric voltage or third group gamma electric voltage are exported respectively, and when switching signal is significant level, gamma electric voltage chip stops second group of gamma electric voltage of output or third group gamma electric voltage, and each first switching element is both turned on so that first resistor string exports first group of gamma electric voltage to source electrode drive circuit.The present invention also provides a kind of liquid crystal display devices.The gamma electric voltage switching device and liquid crystal display device of the present invention, it is possible to provide three groups of gamma electric voltages switch three groups of gamma electric voltages in real time to source electrode drive circuit, so as to improve gray-scale inversion.
Description
Technical field
The present invention relates to field of liquid crystal display more particularly to a kind of gamma electric voltage switching device and liquid crystal display devices.
Background technology
Liquid crystal display device (Liquid Crystal Display, LCD) has good, small, light-weight, the low drive of image quality
It the advantages that dynamic voltage, low-power consumption, relatively low radiationless and manufacturing cost, occupies an leading position at present in flat display field.Its
Be widely used in desktop computer, palmtop computer, personal digital assistant (Personal Digital Assistant,
PDA), in a variety of office automations such as portable phone, TV box and audio-visual equipment.
Currently, the demand to liquid crystal display device image quality is higher and higher.However, prior art liquid crystal display device
The problems such as source electrode drive circuit can only carry out two groups of gamma electric voltage switchings, and picture will appear gray-scale inversion.
Invention content
In view of this, present invention aims at a kind of gamma electric voltage switching device is provided, can solve only to provide two groups of gals
Horse voltage and occur display picture gray-scale inversion the problem of.
Specifically, the present invention provides a kind of gamma electric voltage switching device, including control switching circuit and voltage follower circuit,
The control switching circuit is used for the first switch-over control signal and the second switch-over control signal according to reception, output switching letter
Number.The voltage follower circuit includes first resistor string, multiple first switching elements, second switch element and gamma electric voltage core
Piece.For the first resistor string for generating first group of gamma electric voltage, the first resistor string includes multiple first resistors, and described the
The first end of one resistance string receives the first supply voltage, the second end ground connection of the first resistor string.Multiple first switching elements,
Each first switching element includes the first control terminal, the first path terminal and alternate path end, each first switching element
The first control terminal receive the switching signal, the first path terminal of each first switching element is respectively with described first
The common end of each two adjacent first resistor is connected in resistance string, the alternate path end of each first switching element with
Source electrode drive circuit is connected.The second switch element includes the second control terminal, third path end and fourth passage end, and described the
Second control terminal of two switch elements receives the switching signal, and the third path end of the second switch element receives described the
One supply voltage.The gamma electric voltage chip includes Enable Pin and multiple voltage output ends, and the gamma electric voltage chip enables
End is connected with the fourth passage end of the second switch element, multiple voltage output ends output difference of the gamma electric voltage chip
It corresponds and is connected with the alternate path end of each first switching element.Wherein, the gamma electric voltage chip is cut described
When to change signal be inactive level, according to the level of first switch-over control signal height, second group of gamma electric voltage is exported respectively
Or third group gamma electric voltage, and when the switching signal is significant level, the gamma electric voltage chip stops output described the
Two groups of gamma electric voltages or the third group gamma electric voltage, and each first switching element is both turned on so that first electricity
Resistance string exports first group of gamma electric voltage to the source electrode drive circuit by multiple first switching elements.
Preferably, the significant level of the switching signal is high level.
Preferably, each first switching element is TFT pipes, is integrated on source electrode drive board.
Preferably, it is alternately the AC signal of low and high level when second switch-over control signal is every frame switching.
Preferably, the control switching circuit includes third switch element, the 4th switch element, second resistance and third electricity
Resistance.The third switch element includes third control terminal, fifth passage end and the 6th path terminal, and the of the third switch element
Three control terminals receive first switch-over control signal, the 6th path terminal ground connection of the third switch element.Described 4th opens
It closes element and includes the 4th control terminal, the 7th path terminal and the 8th path terminal, the 4th control terminal of the 4th switch element and institute
The fifth passage end for stating third switch element is connected, and the 7th path terminal of the 4th switch element receives the second switching control
8th path terminal of signal processed, the 4th switch element exports the switching signal.The first end of the second resistance and institute
The 7th path terminal for stating the 4th switch element is connected, and the second end of the second resistance is led to the 5th of the third switch element
Terminal is connected.The first end of the 3rd resistor is connected with the 8th path terminal of the 4th switch element, the 3rd resistor
Second end ground connection.
Preferably, each first switching element is N-type TFT pipes, and the second switch element and the described 4th is opened
It is PMOS tube to close element, and the third switch element is NMOS tube.
Preferably, the control switching circuit includes the 5th switch element, the 6th switch element, the 7th switch element, the
Four resistance and the 5th resistance.5th switch element includes the 5th control terminal, the 9th path terminal and the tenth path terminal, and described the
5th control terminal of five switch elements receives first switch-over control signal, the tenth access termination of the 5th switch element
Ground.6th switch element includes the 6th control terminal, the 11st path terminal and the 12nd path terminal, the 6th switch element
The 6th control terminal receive second switch-over control signal, the 12nd path terminal and the described 5th of the 6th switch element
9th path terminal of switch element is connected.7th switch element includes the 7th control terminal, the tenth threeway terminal and the 14th
7th control terminal of path terminal, the 7th switch element is connected with the 11st path terminal of the 6th switch element, described
Tenth threeway terminal of the 7th switch element exports the switching signal, and the 14th path terminal of the 7th switch element connects
Ground.The first end of 4th resistance receives second source voltage, the second end of the 4th resistance and the 4th switch member
7th path terminal of part is connected.5th resistance, the first end reception second source voltage of the 5th resistance, the described 5th
The second end of resistance is connected with the 9th path terminal of the 5th switch element.
Preferably, each first switching element is N-type TFT pipe, and second switch element is PMOS tube, and the described 5th
Switch element, the 6th switch element and the 7th switch element are NMOS tube.
The present invention also provides a kind of liquid crystal display device, liquid crystal display device includes above-mentioned gamma electric voltage switching device.
The gamma electric voltage switching device and liquid crystal display device of the present invention, it is possible to provide three groups of gamma electric voltages to source drive electricity
Road, and three groups of gamma electric voltages can be switched in real time, the phenomenon that so as to improve gray-scale inversion.For allow the present invention above and other mesh
, feature and advantage can be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings is described in detail below.
Description of the drawings
Fig. 1 is the circuit connection diagram for the gamma electric voltage switching device that first embodiment provides.
Fig. 2 is the circuit connection diagram for the gamma electric voltage switching device that second embodiment provides.
Specific implementation mode
Further to illustrate that the present invention is the technological means and effect realized expected purpose and taken, below in conjunction with attached drawing
And preferred embodiment, to the specific implementation mode of the gamma electric voltage switching device and liquid crystal display device that propose according to the present invention,
Method, step, structure, feature and effect are described in detail as after.
For the present invention aforementioned and other technology contents, feature and effect, in following cooperation with reference to the preferable reality of schema
Applying in the detailed description of example to be clearly presented.By the explanation of specific implementation mode, when expection can be reached to the present invention
The technological means and effect that purpose is taken be able to more deeply and it is specific understand, however institute's accompanying drawings be only to provide with reference to
Purposes of discussion is not intended to limit the present invention.
First embodiment
Referring to FIG. 1, Fig. 1 is the circuit connection diagram for the gamma electric voltage switching device that first embodiment provides.Such as Fig. 1 institutes
Show, the gamma electric voltage switching device of the present embodiment includes control switching circuit 100 and voltage follower circuit 200.The present embodiment
Control switching circuit 100 is used for the first switch-over control signal S1 and the second switch-over control signal S2 according to reception, output switching
Signal.The control switching circuit 100 of the present embodiment include third switch element T3, the 4th switch element T4, second resistance R2 and
3rd resistor R3.Third switch element T3 includes third control terminal, fifth passage end and the 6th path terminal, third switch element T3
Third control terminal receive the first switch-over control signal S1, third switch element T3 the 6th path terminal ground connection.4th switch member
Part T4 includes the 4th control terminal, the 7th path terminal and the 8th path terminal, and the 4th control terminal of the 4th switch element T4 is opened with third
The fifth passage end for closing element T3 is connected, and the 7th path terminal of the 4th switch element T4 receives the second switch-over control signal S2, the
The 8th path terminal of four switch element T4 exports switching signal.The first end of second resistance R2 and the 7th of the 4th switch element T4
Path terminal is connected, and the second end of second resistance R2 is connected with the fifth passage end of third switch element T3.The of 3rd resistor R3
One end is connected with the 8th path terminal of the 4th switch element T4, the second end ground connection of 3rd resistor R3.
Wherein, the third switch element T3 of the present embodiment is NMOS tube, and certainly, third switch element T3 may be NPN
Triode etc.；The 4th switch element T4 of the present embodiment is PMOS tube, and certainly, the 4th switch element T4 may be PNP tri-
Pole pipe etc..
The voltage follower circuit 200 of the present embodiment is opened including first resistor string 210, multiple first switching element T1, second
Close element T2 and gamma electric voltage chip 220 (P-Gamma IC).
Wherein, first resistor string 210 includes multiple for generating first group of gamma electric voltage Gamma1, first resistor string 210
First resistor R1 (shows 15) in figure, the first end of first resistor string 210 receives the first supply voltage AVDD1, first resistor
The second end ground connection of string 210.Wherein, the first supply voltage AVDD1 is that first resistor string 210 provides reference voltage, to first
Resistance string 210 obtains corresponding gamma electric voltage, and then generate first group of gamma electric voltage by the partial pressure of multiple first resistor R1
Gamma1.It will be appreciated by those skilled in the art that the first electricity that first resistor string 210 includes can be arranged as required to
The number of R1 is hindered the gamma electric voltage quantity of first group of gamma electric voltage Gamma1 is arranged, and can be by being arranged first resistor R1's
Resistance value is arranged the voltage value of each gamma electric voltage of first group of gamma electric voltage Gamma1.Wherein, multiple first switching element T1, often
A first switching element T1 include the first control terminal, the first path terminal and alternate path end, each first switching element T1's
First control terminal receives switching signal, the first path terminal of each first switching element T1 respectively in first resistor string 210
The common end of each two adjacent first resistor R1 is connected, and the alternate path end of each first switching element T1 is and source drive
Circuit (not shown) is connected.
In one embodiment, first switching element T1 can be TFT pipes, be integrated on source electrode drive board.The present embodiment
First switching element T1 can be N-type TFT pipe, but the present embodiment is not limited to this, or NMOS tube, tri- poles NPN
Pipe etc..In other embodiments, first switching element T1 may be p-type TFT pipes, PMOS tube or PNP triode etc..
Wherein, second switch element T2 includes the second control terminal, third path end and fourth passage end.Second switch element
The second control terminal of T2 receives switching signal, and the third path end of second switch element T2 receives the first supply voltage AVDD1, the
The fourth passage end of two switch element T2 is connected with the Enable Pin of gamma electric voltage chip 220.The second switch element of the present embodiment
T2 can be PMOS tube, can reach the effect for being switched fast voltage, avoid impacted in switching moment display effect；And it can be with
Prevent the gamma electricity of second group of gamma electric voltage Gamma2 of first resistor string 210 and output of first group of gamma electric voltage Gamma1 of output
Voltage is counter between pressure chip 220 fills.But the present embodiment is not limited to this, and second switch element T2 may be PNP triode etc.
Deng.In other embodiments, second switch element T2 may be NMOS tube or NPN triode etc..
Wherein, gamma electric voltage chip 220 includes Enable Pin and multiple voltage output ends.Gamma electric voltage chip 220 enables
End is connected with the fourth passage end of second switch element T2, multiple voltage output ends of gamma electric voltage chip 220 respectively with it is each
The alternate path end of first switching element T1, which corresponds, to be connected.Wherein, gamma electric voltage chip 220 is invalid electricity in switching signal
Usually, according to the level of the first switch-over control signal S1 height, second group of gamma electric voltage Gamma2 or third group gal are exported respectively
Horse voltage Gamma3, and when switching signal is significant level, gamma electric voltage chip 220 stops second group of gamma electric voltage of output
Gamma2 or third group gamma electric voltage Gamma3, and each first switching element T1 is both turned on so that first resistor string 210 passes through
Multiple first switching elements export first group of gamma electric voltage Gamma1 to source electrode drive circuit.
Specifically, when the first switch-over control signal S1 is low level, the first control terminal of third switch element T3 receives
First switch-over control signal S1 is low level, then third switch element T3 is disconnected, to the fifth passage of third switch element T3
It end cannot be by the third switch element T3 ground connection of disconnection, at this point, the 4th control terminal of the 4th switch element T4 can lead to
It crosses second resistance R2 and receives the second switch-over control signal S2, and the 7th path terminal of the 4th switch element T4 receives the second switching control
Signal S2 processed, then no matter the second switch-over control signal S2 is high level or low level, the 4th control of the 4th switch element T4
End is equal with the voltage in the 7th path terminal of the 4th switch element T4, and the negative pressure open strip of the 4th switch element T4 is not achieved
Part, then the 4th switch element T4 is disconnected, so that the 8th path terminal of the 4th switch element T4 is low by 3rd resistor R3 ground connection
The switching signal of level, i.e. the 8th path terminal output of the 4th switch element T4 is low level.
When the first switch-over control signal S1 is high level, the first control terminal of third switch element T3 receives the first switching
It is high level to control signal S1, then third switch element T3 is connected, to which the fifth passage end of third switch element T3 is by leading
Logical third switch element T3 ground connection is low level, at this point, the 4th control terminal of the 4th switch element T4 and third switch element
The fifth passage end of T3 is connected to low level.When the second switch-over control signal S2 is low level, the of the 4th switch element T4
It is low level that seven path terminals, which receive the second switch-over control signal S2, then the 4th control terminal of the 4th switch element T4 and the 4th switch
The negative pressure unlocking condition of the 4th switch element T4 is not achieved in voltage in the 7th path terminal of element T4, then the 4th switch element T4
It disconnects, is low level, i.e. the 4th switch element to which the 8th path terminal of the 4th switch element T4 is grounded by 3rd resistor R3
The switching signal of the 8th path terminal output of T4 is low level.When the second switch-over control signal S2 is high level, the 4th switch
It is high level that the 7th path terminal of element T4, which receives the second switch-over control signal S2, then the 4th control terminal of the 4th switch element T4
The negative pressure unlocking condition of the 4th switch element T4 can be reached with the voltage in the 7th path terminal of the 4th switch element T4, then
Four switch element T4 conductings receive the to the 8th path terminal of the 4th switch element T4 by the 4th switch element T4 of conducting
Two switch-over control signal S2 are high level, i.e. the switching signal of the 8th path terminal output of the 4th switch element T4 is high level.
So only when the first switch-over control signal S1 and the second switch-over control signal S2 is simultaneously high level, switching letter
Number be high level, the first switch-over control signal S1 and the second switch-over control signal S2 any one when being low level, switching signal is
Low level.And the significant level of the switching signal of the present embodiment is high level.In other embodiments, effective electricity of switching signal
Flat or low level, for corresponding multiple first switching element T1 to be connected and disconnect second switch element T2.
Gamma electric voltage chip 220 receives the first switch-over control signal S1, when switching signal is inactive level, according to first
The level height of switch-over control signal S1, exports second group of gamma electric voltage Gamma2 or third group gamma electric voltage Gamma3 respectively,
That is when the first switch-over control signal S1 is high level, gamma electric voltage chip 220 exports second group of gamma electric voltage Gamma2, and first cuts
When to change control signal S1 be low level, gamma electric voltage chip 220 exports third group gamma electric voltage Gamma3.And it is in switching signal
When significant level so that gamma electric voltage chip 220 stops second group of gamma electric voltage Gamma2 of output or third group gamma electric voltage
Gamma3, specifically, the second control terminal of the second switch element T2 of the present embodiment receive significant level and keep second switch first
Part T2 is disconnected, and the Enable Pin of gamma electric voltage chip 220 cannot receive the first power supply electricity by the second switch element T2 of disconnection
AVDD1 is pressed, then the Enable Pin of gamma electric voltage chip 220 is low level so that gamma electric voltage chip 220 stops second group of gal of output
Horse voltage Gamma2 or third group gamma electric voltage Gamma3；Can also in another embodiment, the second control of second switch element
End processed receives significant level and second switch element T2 is made to be connected, and the Enable Pin of gamma electric voltage chip 220 can pass through conducting
Second switch element T2 receives the first supply voltage AVDD1, then the Enable Pin of gamma electric voltage chip 220 is high level so that gal
Horse voltage chips 220 stop output second group of gamma electric voltage Gamma2 or third group gamma electric voltage Gamma3.Meanwhile each first
When receiving the significant level of switching signal, each first switching element T1 is both turned on switch element T1 so that first resistor string
Voltage (V1, V2...V13, V14) in 210 between each two adjacent first resistor R1 can pass through multiple the first of conducting
Switch element T1 is exported to source electrode drive circuit (not shown), and voltage V1~V14 is first group of gamma electric voltage Gamma1,
I.e. first resistor string 210 exports first group of gamma electric voltage Gamma1 to source drive by multiple first switching element T1 of conducting
Circuit.
So the gamma electric voltage switching device of the present embodiment can be controlled according to the switchings of the first switch-over control signal S1 and second
The phenomenon that signal S2 processed, three groups of gamma electric voltages (can specifically refer to following table) of switching output in real time, improvement gray-scale inversion.However,
When the present invention does not limit the first switch-over control signal S1 and the second switch-over control signal S2 while being high level, switching signal is
Significant level, such as in other embodiment, or the first switch-over control signal S1 and the second switch-over control signal S2 are simultaneously
For low level when, switching signal is significant level, correspondingly, gamma electric voltage switching device the first switch-over control signal S1 be it is low
When level, gamma electric voltage switching device exports the second gamma electric voltage Gamma2；Gamma electric voltage switching device is in the first switching control
When signal S1 is low level, according to the level of the second switch-over control signal S2 height, gamma electric voltage switching device exports the respectively
Three groups of gamma electric voltage Gamma3 or first group of gamma electric voltage Gamma1, also belong to protection scope of the present invention.
The low level of the present embodiment is not limited to the voltage close to 0V, can also be high level be positive voltage, it is relatively, low
Level is negative voltage.
In one embodiment, it is alternately the AC signal of low and high level when the second switch-over control signal S2 is every frame switching,
Such as can be the signal that shift register is output to drive element of the grid.To first switch-over control signal of the present embodiment
When S1 is low level, gamma electric voltage switching device exports third group gamma electric voltage Gamma3；First switch-over control signal S1 is height
When being alternately the AC signal of low and high level when level and the second switch-over control signal S2 are every frame switching, gamma electric voltage switching dress
First group of gamma electric voltage Gamma1 and second group of gamma electric voltage Gamma2 is alternately exported when setting every frame switching, thus, it can be preferably
The phenomenon that improving gray-scale inversion.
The gamma electric voltage switching device of the present embodiment, it is possible to provide three groups of gamma electric voltages, and can be real-time to source electrode drive circuit
Switch three groups of gamma electric voltages, the phenomenon that so as to improve gray-scale inversion.
Second embodiment
Fig. 2 is the circuit connection diagram for the gamma electric voltage switching device that second embodiment provides.Second embodiment is real with first
It is essentially identical to apply example, the difference is that, control switching circuit 100 includes the 5th switch element T5, the 6th switch element T6, the
Seven switch element T7, the 4th resistance R4 and the 5th resistance R5.5th switch element T5 include the 5th control terminal, the 9th path terminal and
5th control terminal of the tenth path terminal, the 5th switch element T5 receives the first switch-over control signal S1, the 5th switch element T5's
Tenth path terminal is grounded.6th switch element T6 includes the 6th control terminal, the 11st path terminal and the 12nd path terminal, and the 6th opens
The 6th control terminal for closing element T6 receives the second switch-over control signal S2, the 12nd path terminal and the 5th of the 6th switch element T6
The 9th path terminal of switch element T5 is connected.7th switch element T7 includes the 7th control terminal, the tenth threeway terminal and the 14th
7th control terminal of path terminal, the 7th switch element T7 is connected with the 11st path terminal of the 6th switch element T6, the 7th switch
The tenth threeway terminal outputting cutting of element T7 changes signal, the 14th path terminal ground connection of the 7th switch element T7.4th resistance R4
First end receive second source voltage AVDD2, the 7th path terminal of the second end and the 4th switch element T4 of the 4th resistance R4
It is connected.The first end of 5th resistance R5, the 5th resistance R5 receives second source voltage AVDD2, the second end of the 5th resistance R5 with
The 9th path terminal of 5th switch element T5 is connected.
Wherein, the 5th switch element T5, the 6th switch element T6 and the 7th switch element T7 of the present embodiment can be
NMOS tube, but the present embodiment is not limited to this, or NPN triode etc..
Wherein, second source voltage AVDD2 is used for as the 5th switch element T5, the 6th switch element T6 and the 7th switch member
Part T7 provides voltage, and the corresponding cut-in voltage received to the corresponding controling end of respective switch element matches, and plays conducting and opens
Close the effect of element.In addition, the first supply voltage AVDD1 and second source voltage AVDD2 of the present embodiment can be two electricity
Source voltage, but the present embodiment is not limited to this, and the first supply voltage AVDD1 and second source voltage AVDD2 may be same
Supply voltage.
Specifically, only in the first switch-over control signal S1 and the second switch-over control signal S2 it is high level simultaneously so that the
The 5th control terminal of five switch element T5 receives the high level of the first switch-over control signal S1 and is connected, the 6th switch element T6's
When 6th control terminal receives the high level of the second switch-over control signal S2 and is connected, the 7th control terminal of the 7th switch element T7 can
With by the 5th switch element T5 of conducting and the 6th switch element T6 ground connection, for low level, then the 7th switch element T7 is disconnected,
Cannot be by the 7th switch element T7 ground connection of disconnection to the 14th path terminal of, the 7th switch element T7, and pass through the
It is high level that five resistance R5, which receive second source voltage AVDD2, i.e. the 14th path terminal output of the 7th switch element T7 is cut
It is high voltage to change voltage.
Any in the first switch-over control signal S1 or the second switch-over control signal S2 is low level so that the 5th switch member
The 5th control terminal of part T5 receive the low level of the first switch-over control signal S1 and disconnect or the 6th switch element T6 the 6th
When control terminal receives the low level of the second switch-over control signal S2 and disconnects, the 7th control terminal of the 7th switch element T7 cannot
By the 5th switch element T5 of disconnection or the 6th switch element T6 ground connection of disconnection, and the second electricity is received by the 4th resistance R4
Source voltage AVDD2 is high level, then the 7th switch element T7 conductings, to which the 14th path terminal of the 7th switch element T7 can
To be grounded by the 7th switch element T7 of conducting, i.e. the switching voltage of the 14th path terminal output of the 7th switch element T7 is
Low-voltage.
Gamma electric voltage chip 220 receives the first switch-over control signal S1, when switching signal is inactive level, according to first
The level height of switch-over control signal S1, exports second group of gamma electric voltage Gamma2 or third group gamma electric voltage Gamma3 respectively,
That is when the first switch-over control signal S1 is high level, gamma electric voltage chip 220 exports second group of gamma electric voltage Gamma2, and first cuts
When to change control signal S1 be low level, gamma electric voltage chip 220 exports third group gamma electric voltage Gamma3.And it is in switching signal
When significant level, gamma electric voltage chip 220 stops output second group of gamma electric voltage Gamma2 or third group gamma electric voltage Gamma3,
Specifically, the second control terminal of the second switch element T2 of the present embodiment receives significant level and keeps second switch element T2 disconnected
It opens, the Enable Pin of gamma electric voltage chip 220 cannot receive the first supply voltage by the second switch element T2 of disconnection
AVDD1, then the Enable Pin of gamma electric voltage chip 220 is low level so that gamma electric voltage chip 220 stops second group of gamma of output
Voltage Gamma2 or third group gamma electric voltage Gamma3；Can also in another embodiment, the second control of second switch element T2
End processed receives significant level and second switch element T2 is made to be connected, and the Enable Pin of gamma electric voltage chip 220 can pass through conducting
Second switch element T2 receives the first supply voltage AVDD1, then the Enable Pin of gamma electric voltage chip 220 is high level so that gal
Horse voltage chips 220 stop output second group of gamma electric voltage Gamma2 or third group gamma electric voltage Gamma3.Meanwhile each first
When receiving the significant level of switching signal, each first switching element T1 is both turned on switch element T1 so that first resistor string
Voltage (V1, V2...V13, V14) in 210 between each two adjacent first resistor R1 can pass through multiple the first of conducting
Switch element T1 is exported to source electrode drive circuit (not shown), and voltage V1~V14 is first group of gamma electric voltage Gamma1,
I.e. first resistor string 210 exports first group of gamma electric voltage Gamma1 to source drive by multiple first switching element T1 of conducting
Circuit.
So the gamma electric voltage switching device of the present embodiment can be controlled according to the switchings of the first switch-over control signal S1 and second
The phenomenon that signal S2 processed, three groups of gamma electric voltages (can specifically refer to following table) of switching output in real time, improvement gray-scale inversion.However,
When the present invention does not limit the first switch-over control signal S1 and the second switch-over control signal S2 while being high level, switching signal is
Significant level, such as in other embodiment, or the first switch-over control signal S1 and the second switch-over control signal S2 are simultaneously
For low level when, switching signal is significant level, correspondingly, gamma electric voltage switching device the first switch-over control signal S1 be it is low
When level, gamma electric voltage switching device exports the second gamma electric voltage Gamma2；Gamma electric voltage switching device is in the first switching control
When signal S1 is low level, according to the level of the second switch-over control signal S2 height, gamma electric voltage switching device exports the respectively
Three groups of gamma electric voltage Gamma3 or first group of gamma electric voltage Gamma1, also belong to protection scope of the present invention.
The low level of the present embodiment is not limited to the voltage close to 0V, can also be high level be positive voltage, it is relatively, low
Level is negative voltage.
In one embodiment, it is alternately the AC signal of low and high level when the second switch-over control signal S2 is every frame switching.
To which when the first switch-over control signal S1 of the present embodiment is low level, gamma electric voltage switching device exports third group gamma electricity
Press Gamma3；It is alternately height when first switch-over control signal S1 is high level and the second switch-over control signal S2 is every frame switching
When the AC signal of level, first group of gamma electric voltage Gamma1 and second is alternately exported when gamma electric voltage switching device switches per frame
Group gamma electric voltage Gamma2, to the phenomenon that capable of preferably improving gray-scale inversion.
The gamma electric voltage switching device of the present embodiment, it is possible to provide three groups of gamma electric voltages, and can be real-time to source electrode drive circuit
Switch three groups of gamma electric voltages, the phenomenon that so as to improve gray-scale inversion.
3rd embodiment
The present embodiment also provides a kind of liquid crystal display device, and liquid crystal display device includes that above-mentioned gamma electric voltage switching fills
It sets.
The liquid crystal display device of the present embodiment, it is possible to provide three groups of gamma electric voltages can switch in real time to source electrode drive circuit
Three groups of gamma electric voltages, the phenomenon that so as to improve gray-scale inversion.
More than, only it is presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, although this
Invention is disclosed above with preferred embodiment, however is not limited to invent, any person skilled in the art, not
It is detached within the scope of inventive technique scheme, when the technology contents using the disclosure above make a little change or are modified to equivalent variations
Equivalent embodiment, as long as being without departing from inventive technique scheme content, the technical spirit according to invention makees above example
Any simple modification, equivalent change and modification, in the range of still falling within technical solution of the present invention.
Claims (9)
1. a kind of gamma electric voltage switching device, which is characterized in that including control switching circuit (100) and voltage follower circuit
(200), the control switching circuit (100) is used to be believed according to the first switch-over control signal (S1) of reception and the second switching control
Number (S2) exports switching signal；The voltage follower circuit (200), including：
First resistor string (210), the first resistor string (210) is for generating first group of gamma electric voltage, the first resistor string
(210) include multiple first resistors (R1), the first end of the first resistor string (210) receives the first supply voltage (AVDD1),
The second end of the first resistor string (210) is grounded；
Multiple first switching elements (T1), each first switching element (T1) include the first control terminal, the first path terminal and the
Two path terminals, the first control terminal of each first switching element (T1) receive the switching signal, and described each first
First path terminal of switch element (T1) respectively with each two adjacent first resistor (R1) in the first resistor string (210)
Common end is connected, and the alternate path end of each first switching element (T1) is connected with source electrode drive circuit；
Second switch element (T2), the second switch element (T2) include the second control terminal, third path end and fourth passage
End, the second control terminal of the second switch element (T2) receive the switching signal, and the of the second switch element (T2)
Three-way end receives first supply voltage (AVDD1)；
Gamma electric voltage chip (220), the gamma electric voltage chip (220) include Enable Pin and multiple voltage output ends, the gal
The Enable Pin of horse voltage chips (220) is connected with the fourth passage end of the second switch element (T2), the gamma electric voltage core
Multiple voltage output ends of piece (220) correspond phase with the alternate path end of each first switching element (T1) respectively
Even；
Wherein, the gamma electric voltage chip (220) is when the switching signal is inactive level, according to first switching control
The level height of signal (S1), exports second group of gamma electric voltage or third group gamma electric voltage, and be in the switching signal respectively
When significant level, the gamma electric voltage chip (220) stops exporting second group of gamma electric voltage or third group gamma electricity
Pressure, and each first switching element (T1) is both turned on so that the first resistor string (210) passes through multiple first switches member
Part (T1) exports first group of gamma electric voltage to the source electrode drive circuit.
2. gamma electric voltage switching device as described in claim 1, which is characterized in that the significant level of the switching signal is height
Level.
3. gamma electric voltage switching device as described in claim 1, which is characterized in that each first switching element (T1) is equal
It manages, is integrated on source electrode drive board for TFT.
4. gamma electric voltage switching device as described in claim 1, which is characterized in that second switch-over control signal (S2) is
It is alternately the AC signal of low and high level when switching per frame.
5. gamma electric voltage switching device as described in claim 1, which is characterized in that the control switching circuit (100) includes：
Third switch element (T3), the third switch element (T3) include third control terminal, fifth passage end and the 6th access
The third control terminal at end, the third switch element (T3) receives first switch-over control signal (S1), the third switch
6th path terminal of element (T3) is grounded；
4th switch element (T4), the 4th switch element (T4) include the 4th control terminal, the 7th path terminal and the 8th access
End, the 4th control terminal of the 4th switch element (T4) are connected with the fifth passage end of the third switch element (T3), institute
The 7th path terminal for stating the 4th switch element (T4) receives second switch-over control signal (S2), the 4th switch element
(T4) the 8th path terminal exports the switching signal；
Second resistance (R2), the 7th path terminal phase of the first end and the 4th switch element (T4) of the second resistance (R2)
Even, the second end of the second resistance (R2) is connected with the fifth passage end of the third switch element (T3)；
3rd resistor (R3), the 8th path terminal phase of the first end and the 4th switch element (T4) of the 3rd resistor (R3)
Even, the second end ground connection of the 3rd resistor (R3).
6. gamma electric voltage switching device as claimed in claim 5, which is characterized in that each first switching element (T1) is equal
It is managed for N-type TFT, the second switch element (T2) and the 4th switch element (T4) are PMOS tube, the third switch
Element (T3) is NMOS tube.
7. gamma electric voltage switching device as described in claim 1, which is characterized in that the control switching circuit (100) includes：
5th switch element (T5), the 5th switch element (T5) include the 5th control terminal, the 9th path terminal and the tenth access
5th control terminal at end, the 5th switch element (T5) receives first switch-over control signal (S1), the 5th switch
Tenth path terminal of element (T5) is grounded；
6th switch element (T6), the 6th switch element (T6) include the 6th control terminal, the 11st path terminal and the 12nd
Path terminal, the 6th control terminal reception second switch-over control signal (S2) of the 6th switch element (T6), the described 6th
12nd path terminal of switch element (T6) is connected with the 9th path terminal of the 5th switch element (T5)；
7th switch element (T7), the 7th switch element (T7) include the 7th control terminal, the tenth threeway terminal and the 14th
Path terminal, the 11st path terminal phase of the 7th control terminal and the 6th switch element (T6) of the 7th switch element (T7)
Even, the tenth threeway terminal of the 7th switch element (T7) exports the switching signal, the 7th switch element (T7)
14th path terminal is grounded；
The first end of 4th resistance (R4), the 4th resistance (R4) receives second source voltage (AVDD2), the 4th resistance
(R4) second end is connected with the 7th path terminal of the 4th switch element (T4)；
5th resistance (R5), the first end reception second source voltage (AVDD2) of the 5th resistance (R5), the described 5th
The second end of resistance (R5) is connected with the 9th path terminal of the 5th switch element (T5).
8. gamma electric voltage switching device as claimed in claim 7, which is characterized in that each first switching element (T1) is equal
It is managed for N-type TFT, second switch element (T2) is PMOS tube, the 5th switch element (T5), the 6th switch element (T6)
It is NMOS tube with the 7th switch element (T7).
9. a kind of liquid crystal display device, including gate driving circuit, which is characterized in that the liquid crystal display device includes that right such as is wanted
Seek the gamma electric voltage switching device described in any one of 1 to 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109658899A (en) * | 2019-02-28 | 2019-04-19 | 昆山龙腾光电有限公司 | Voltage commutation circuit, gamma voltage generation circuit and liquid crystal display device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396580A (en) * | 2001-07-06 | 2003-02-12 | 日本电气株式会社 | Drive circuit and liquid crystal display device |
| US20060145982A1 (en) * | 2005-01-06 | 2006-07-06 | Der-Yuan Tseng | Method and apparatus for compensating gray-level luminance |
| CN1937025A (en) * | 2005-09-23 | 2007-03-28 | 奇美电子股份有限公司 | Grey-to-grey voltage generating circuit for plane display and operation method |
| CN102637417A (en) * | 2011-02-14 | 2012-08-15 | 三星电子株式会社 | Systems and methods for driving a display device |
| CN103745695A (en) * | 2013-12-02 | 2014-04-23 | 深圳市华星光电技术有限公司 | Gamma voltage drive circuit, source drive module and liquid crystal display panel |
| CN104700800A (en) * | 2015-01-07 | 2015-06-10 | 友达光电股份有限公司 | Gamma voltage generation circuit and gamma voltage generation method |
| CN105261336A (en) * | 2014-05-30 | 2016-01-20 | 奇景光电股份有限公司 | Gamma voltage generation circuit |
| CN106409256A (en) * | 2016-11-03 | 2017-02-15 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal display device |
-
2018
- 2018-04-28 CN CN201810404843.6A patent/CN108682403B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396580A (en) * | 2001-07-06 | 2003-02-12 | 日本电气株式会社 | Drive circuit and liquid crystal display device |
| US20060145982A1 (en) * | 2005-01-06 | 2006-07-06 | Der-Yuan Tseng | Method and apparatus for compensating gray-level luminance |
| CN1937025A (en) * | 2005-09-23 | 2007-03-28 | 奇美电子股份有限公司 | Grey-to-grey voltage generating circuit for plane display and operation method |
| CN102637417A (en) * | 2011-02-14 | 2012-08-15 | 三星电子株式会社 | Systems and methods for driving a display device |
| CN103745695A (en) * | 2013-12-02 | 2014-04-23 | 深圳市华星光电技术有限公司 | Gamma voltage drive circuit, source drive module and liquid crystal display panel |
| CN105261336A (en) * | 2014-05-30 | 2016-01-20 | 奇景光电股份有限公司 | Gamma voltage generation circuit |
| CN104700800A (en) * | 2015-01-07 | 2015-06-10 | 友达光电股份有限公司 | Gamma voltage generation circuit and gamma voltage generation method |
| CN106409256A (en) * | 2016-11-03 | 2017-02-15 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal display device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109658899A (en) * | 2019-02-28 | 2019-04-19 | 昆山龙腾光电有限公司 | Voltage commutation circuit, gamma voltage generation circuit and liquid crystal display device |
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