CN109817178A - A kind of gamma circuit, driving circuit and display device - Google Patents
A kind of gamma circuit, driving circuit and display device Download PDFInfo
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- CN109817178A CN109817178A CN201910219880.4A CN201910219880A CN109817178A CN 109817178 A CN109817178 A CN 109817178A CN 201910219880 A CN201910219880 A CN 201910219880A CN 109817178 A CN109817178 A CN 109817178A
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Abstract
This application discloses a kind of gamma circuit, driving circuit and display device, the gamma circuit includes internal reference voltage module and digital revolving die intends module, and internal reference voltage module includes the first reference voltage unit and the second reference voltage unit；The number turns analog module and the internal reference voltage module couples, it includes that at least two numbers turn analogue unit to export at least two different gamma electric voltages that the number, which turns analog module, and each number turns analogue unit and is connected to first reference voltage unit and/or the second reference voltage unit；The voltage value that the voltage value of the first reference voltage unit output and second reference voltage unit export is different.Gamma circuit is different according to the output valve of the gamma electric voltage of itself, selects different reference voltages when carrying out gamma electric voltage output, to reach more accurate partial pressure, improves the precision of gamma circuit, exports more particularly suitable accurately gamma electric voltage.
Description
Technical field
This application involves field of display technology more particularly to a kind of gamma circuits, driving circuit and display device.
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.
TFT-LCD Panel (thin film transistor-liquid crystal display panel) is by Bonding (binding) technology by PCB (printed circuit
Plate), Source Driver IC (data driving chip) and LCD optical film piece be connected to constitute TFT-LCD display system；It passes
Unite P-gam IC (programmable gamma chip) internal DAC (digital analog converter Digital-to-Analog
Converter VREF (P-Gam IC internal reference voltage) and VSS (i.e. ground connection 0V) voltage) are coupled with；Gamma chip it is defeated
The internal reference voltage of voltage Primary Reference gamma chip is divided out.
Internal reference voltage output valve is fixed, and only one voltage value when gamma circuit divides, divides as reference
Pressure generate voltage value be in fixed range, it may be necessary to virtual voltage and partial pressure after voltage error value it is bigger, such as
Fruit is not in controlled range, it would be possible that it is chaotic to will cause display.
Summary of the invention
The purpose of the application is to provide gamma circuit, driving circuit and the display dress of a kind of raising gamma electric voltage Adjustment precision
It sets.
This application discloses a kind of gamma circuit, the gamma circuit includes that internal reference voltage module and digital revolving die are quasi-
Module, the internal reference voltage module include the first reference voltage unit and the second reference voltage unit；The number revolving die
Quasi- module and the internal reference voltage module couples, it includes that at least two numbers turn analogue unit that the number, which turns analog module,
To export at least two different gamma electric voltages, each number turns analogue unit and is connected to first reference voltage
Unit and/or the second reference voltage unit；Wherein, the voltage value of the first reference voltage unit output and second reference
The voltage value of voltage cell output is different.
Optionally, the gamma circuit includes buffer and fixed memory, and with the fixed memory and temporary
The bi-directional serial bus of device connection；It further includes at least two buffers, the output of the buffer that the number, which turns analog module,
End is connected to the number and turns analogue unit, and each number turns analogue unit and is correspondingly connected with each buffer.
Optionally, the voltage value of the first reference voltage unit output is the first reference voltage；Described second with reference to electricity
The voltage value for pressing unit output is the second reference voltage, and first reference voltage is greater than second reference voltage；The number
It includes that the first number turns analogue unit and the second number turns analogue unit that word, which turns analog module, and first number turns analogue unit
The gamma electric voltage of output is greater than the gamma electric voltage that second number turns analogue unit output；First reference voltage is greater than institute
State the second reference voltage.
Optionally, first number, which turns analogue unit, has N number of, and second number, which turns analogue unit, M；Described
The gamma electric voltage that one number turns analogue unit output is more than or equal to second reference voltage, is less than first reference voltage；
The gamma electric voltage that described second digital revolving die intends voltage output is less than or equal to second reference voltage；Each first number
The positive ends for turning analogue unit are connect with first reference voltage unit, and each first number turns the negative of analogue unit
Polar end is connect with second reference voltage unit；Each second number turns the positive ends and described the of analogue unit
The connection of one reference voltage unit, each second number turn the negative polarity end ground connection of analogue unit；Or each described first
The positive ends that number turns analogue unit are connect with first reference voltage unit, and each first number turns analogue unit
Negative polarity end ground connection；Each second number turns the positive ends of analogue unit and second reference voltage unit connects
It connects, each second number turns the negative polarity end ground connection of analogue unit；M, N is the positive integer more than or equal to 1.
Optionally, first number, which turns analogue unit, has N number of, and second number, which turns analogue unit, M；Described
The gamma electric voltage that one number turns analogue unit output is more than or equal to the second reference voltage, is less than first reference voltage；It is described
The gamma electric voltage that second digital revolving die intends voltage output is less than or equal to second reference voltage；Each described first digital revolving die
The positive ends of quasi-simple member are connect with first reference voltage unit, and each first number turns the negative polarity of analogue unit
End is connect with second reference voltage unit；Each second number turns the positive ends and second ginseng of analogue unit
Voltage cell connection is examined, each second number turns the negative polarity end ground connection of analogue unit；M, N is just whole more than or equal to 1
Number.
Optionally, first reference voltage is twice of second reference voltage, and it is defeated that the first number turns analogue unit
Gamma electric voltage out is less than or equal to first reference voltage, and is greater than second reference voltage；Second digital revolving die is quasi-simple
The gamma electric voltage of member output is less than or equal to second reference voltage.
Optionally, the M and N meets following formula: M+N=14.
Optionally, gamma circuit described in the gamma circuit includes buffer, the buffer export the data of 10bit to
The number turns analog module, to complete digital-to-analogue conversion；The precision meter of the gamma electric voltage of the first D/A conversion unit output
Calculation meets following formula:
LSB1=(V_REF-V_HREF)/(2^10-1)=V_HREF/ (2^10-1), Gam=V_REF/1023*n+V_
HVEF；
The accuracy computation of the gamma electric voltage of the second D/A conversion unit output meets following formula:
LSB2=V_HREF/ (2^10-1), Gam=V_HREF/1023*n；
Wherein, LSB is minimum resolution voltage, and V_REF is the first reference voltage, and V_HREF is the second reference voltage, Gam
It is the gamma electric voltage value of output, n is the positive integer in 0~1023.
Disclosed herein as well is a kind of driving circuits, and including as above any gamma circuit, the driving circuit is also
Including data drive circuit, the gamma circuit exports gamma electric voltage to the data drive circuit.
Disclosed herein as well is a kind of display devices, drive including above-mentioned driving circuit, and by the driving circuit
Display panel.
Relative to only one reference voltage unit of internal reference voltage module, the scheme for only providing a reference voltage is come
It says, the internal reference voltage module of the application includes two different reference voltage units, different to provide two voltage values
Reference voltage selects in this way, gamma circuit is different according to the output valve of the gamma electric voltage of itself when carrying out gamma electric voltage output
More suitable reference voltage unit obtains different reference voltages by being connected to different reference voltage units, to reach more
Accurately partial pressure is conducive to the scope of application for improving display panel, meanwhile, be conducive to the precision for improving gamma circuit, to obtain
More particularly suitable accurately gamma electric voltage is exported.
Detailed description of the invention
Included attached drawing is used to provide that a further understanding of the embodiments of the present application, and which constitute one of specification
Point, for illustrating presently filed embodiment, and with verbal description come together to illustrate the principle of the application.Under it should be evident that
Attached drawing in the description of face is only some embodiments of the present application, for those of ordinary skill in the art, is not paying wound
Under the premise of the property made is laborious, it is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram of display device of the embodiment of the application；
Fig. 2 is the schematic diagram of the driving circuit of the embodiment of the application；
Fig. 3 is a kind of schematic diagram of gamma circuit of the embodiment of the application；
Fig. 4 is the schematic diagram of another gamma circuit of another embodiment of the application；
Fig. 5 is the schematic diagram of the gamma circuit of another embodiment of the application.
Wherein, 100, display device；200, display panel；300, driving circuit；310, gamma circuit；320, internal reference
Voltage module；321, the first reference voltage unit；322, the second reference voltage unit；330, number turns analog module；331,
One number turns analogue unit；332, the second number turns analogue unit；333, buffer；340, buffer；350, bidirectional linked list is total
Line；360, fixed memory；370, data drive circuit.
Specific embodiment
It is to be appreciated that term used herein above, disclosed specific structure and function details, it is only for description
Specific embodiment is representative, but the application can be implemented by many alternative forms, be not construed as only
It is limited to the embodiments set forth herein.
In the description of the present application, term " first ", " second " are used for description purposes only, and it is opposite to should not be understood as instruction
Importance, or implicitly indicate the quantity of indicated technical characteristic.As a result, unless otherwise indicated, " first ", " are defined
Two " feature can explicitly or implicitly include one or more of the features；The meaning of " plurality " is two or two
More than.Term " includes " and its any deformation, mean and non-exclusive include, it is understood that there may be or addition is one or more that other are special
Sign, integer, step, operation, unit, component and/or combination thereof.
In addition, "center", " transverse direction ", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner",
The term of the orientation or positional relationship of the instructions such as "outside" is that orientation or relative positional relationship based on the figure describe, only
Be that the application simplifies description for ease of description, rather than indicate signified device or element must have a particular orientation,
It is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Furthermore unless specifically defined or limited otherwise, term " installation ", " connected ", " connection " shall be understood in a broad sense, example
Such as it may be fixed connection or may be dismantle connection, or integral connection；It can be mechanical connection, be also possible to be electrically connected
It connects；It can be directly connected, it can also indirectly connected through an intermediary or the connection inside two elements.For ability
For the those of ordinary skill in domain, the concrete meaning of above-mentioned term in this application can be understood as the case may be.
Below with reference to the accompanying drawings the application is described further with optional embodiment.
As shown in Figure 1, display device 100 includes display panel 200 and drives this application discloses a kind of display device 100
Dynamic circuit 300, driving circuit 300 drive display panel 200；Further, with reference to Fig. 2, the driving circuit 300 includes gamma
Circuit 310 and data drive circuit 370, gamma circuit 310 export gamma electric voltage to data drive circuit 370.
By Fig. 3 it is recognised that the gamma circuit 310 includes that internal reference voltage module 320 and digital revolving die intend mould
Block 330, internal reference voltage module 320 include the first reference voltage unit 321 and the second reference voltage unit 322, and number turns
Analog module 330 and the internal reference voltage module 320 couple, and it includes at least two numbers that the number, which turns analog module 330,
Word turns analogue unit to export at least two different gamma electric voltages, each number turn analogue unit be connected to it is described
First reference voltage unit 321 and/or the second reference voltage unit 322；(by taking two digital revolving dies intend module as an example, the first ginseng
Examining voltage cell 321 only can turn analog module with one of number and connect, naturally it is also possible to two digital quasi- moulds of revolving dies
Block connects simultaneously respectively).
It further include having buffer 340 and fixed memory 360, and deposit with the fixation in above-mentioned gamma circuit 310
The bi-directional serial bus 350 that reservoir 360 and buffer 340 connect；Bidirectional linked list sum coupling buffer 340 can be exported directly
Data-signal, can also be by being first input in fixed memory 360, then by fixed storage to buffer 340 by data-signal
Device 360 by data signal transmission to buffer 340, even if fixed memory 360, after electric current is turned off, the data of storage will not disappear
It loses, gamma circuit 310 includes programmable gamma chip, mainly implements the operation of partial pressure by the gamma chip.
In addition, it further includes at least two buffers 333, the output of the buffer 340 that the number, which turns analog module 330,
End is connected to the number and turns analog module 330, and number and the number of the output end of the buffer 340 turn the defeated of analogue unit
Enter the number at end to etc., and the input terminal that the output end of the temporary gas turns analogue unit with number connects one to one, in addition
Each number connects a buffer 333 after turning analogue unit.
It is divided in the present solution, mainly can choose different reference voltages, first reference voltage unit 321 is defeated
The voltage value that voltage value out and second reference voltage unit 322 export is different.In actual operation, buffer 340 is deposited
The relevant data signals that output turns analog module 330 to number are stored up, turns the partial pressure of analog module 330 in number and forms gamma electric voltage
When, it can be different according to the output valve of gamma electric voltage, different reference voltages is selected, to reach more accurate partial pressure, improves gal
The precision of horse circuit 310 is exported with obtaining more particularly suitable accurately gamma electric voltage, can generally be set when being exported
A buffer 333 is set, the main promotion ability for increasing gamma electric voltage output avoids a large amount of power consumption penalty.
The voltage value that we export the first reference voltage unit 321 is the first reference voltage (V_REF)；Second ginseng
The voltage value for examining the output of voltage cell 322 is the second reference voltage (H_REF), and first reference voltage is greater than described second
Reference voltage；Second reference voltage is divided into two kinds of situations by us, the maximum value of gamma electric voltage less than the second reference voltage, that
We select the second reference voltage at this time, can meet normal gamma electric voltage output, if the first reference voltage of selection,
The precision of adjustment just can not meet our requirement.
But with the development of science and technology, display panel 200 may exist two different display patterns, first
Under display pattern, the maximum value of gamma electric voltage is less than the second reference voltage；
And under the second display pattern, the maximum value of gamma electric voltage is greater than the second reference voltage, and less than the first reference voltage,
So we will select different reference voltages according to different display patterns, and two different reference voltage lists are arranged such
Member is not only adapted to more model selections, and the precision that can also improve gamma electric voltage reaches better display effect.
In addition, when gamma electric voltage maximum value be less than or equal to the first reference voltage, and be greater than the second reference voltage when, including
Following improvement project.Assuming that first number, which turns analogue unit 331, to be had N number of, second number, which turns analogue unit 332, to be had
M；The gamma electric voltage that first number turns the output of analogue unit 331 is less than first reference voltage, and is greater than second ginseng
Examine voltage；The gamma electric voltage that second number turns the output of analogue unit 332 is less than second reference voltage.
With reference to shown in Fig. 3 and Fig. 4, each first number turns the positive ends and first ginseng of analogue unit 331
Examine voltage cell 321 connection, each first number turn analogue unit 331 negative polarity end and the second reference voltage list
Member 322 connects；Each second number turns the positive ends of analogue unit 332 and first reference voltage unit 321 connects
It connects, each second number turns the negative polarity end ground connection of analogue unit 332；
First number each in other words turns the positive ends and first reference voltage unit of analogue unit 331
321 connections, each first number turn the negative polarity end ground connection of analogue unit 331；
The positive ends that each second number turns analogue unit 332 are connect with second reference voltage unit 322,
Each second number turns the negative polarity end ground connection of analogue unit 332；
M, N are the positive integer more than or equal to 1 herein.
It is attached and exports in the present solution, two different reference pairs answer different numbers to turn analogue unit, different gals
Horse voltage output can select to divide according to different reference voltages, by taking same gray level as an example, it is assumed that 0-255 grayscale, voltage point
Pressing is 256 parts, if the voltage of 10V points of every portion is 10/256 by taking voltage 10V and 5V as an example, and 5V points of every portion
Voltage is 5/256, and so selection 5V, the precision divided for gamma circuit 310 are just high.
As shown in figure 5, in one embodiment, first reference voltage is twice of second reference voltage, described
First number turn analogue unit 331 have it is N number of, each first digital simulation unit include a digital analog converter (DAC),
Second number, which turns analogue unit 332, M, each second digital simulation unit includes a digital analog converter
(DAC), by taking M=N=7 as an example, optimal case that we are typically chosen are as follows: each first number turns analogue unit 331
Positive ends are connect with first reference voltage unit 321, and each first number turns the negative polarity end of analogue unit 331
It is connect with second reference voltage unit 322, V_REF is the first reference voltage, and V_HREF is the second reference voltage, V_REF
=2V_HREF.
The positive ends that each second number turns analogue unit 332 are connect with second reference voltage unit 322,
Each second number turns the negative polarity end ground connection of analogue unit 332；The gamma circuit 310 includes buffer 340, described
The data that buffer 340 exports 10bit turn analog module 330 to the number, to complete digital-to-analogue conversion；
It is calculated by taking Gam1-Gam7 as an example, the accuracy computation of the gamma electric voltage of the first D/A conversion unit output meets
Following formula:
LSB1=(V_REF-V_HREF)/(2^10-1)=V_HREF/ (2^10-1)
Gam=V_REF/1023*n+V_HVEF；
It is calculated by taking Gam8-Gam14 as an example, the accuracy computation of the gamma electric voltage of the second D/A conversion unit output meets
Following formula:
LSB2=V_HREF/ (2^10-1), Gam=V_HREF/1023*n；
Wherein, LSB is minimum resolution voltage, and V_REF is the first reference voltage, and V_HREF is the second reference voltage, Gam
It is the gamma electric voltage value of output, n is the positive integer in 0~1023.
LSB voltage is reduced to LSB=V_HREF/ (2^10-1) by LSB=V_REF/ (2^10-1), since HREF voltage subtracts
It is less the half of VREF, i.e., the Gam voltage Adjustment precision that gamma circuit 310 exports improves half and its performance is substantially improved.
The technical solution of the application can be widely applied to various display panels, such as twisted nematic (Twisted
Nematic, TN) display panel, plane conversion type (In-Plane Switching, IPS) display panel, vertical orientation type
(Vertical Alignment, VA) display panel, more quadrant vertical orientation type (Multi-Domain Vertical
Alignment, MVA) display panel, it is of course also possible to be other kinds of display panel, such as Organic Light Emitting Diode
(Organic Light-Emitting Diode, OLED) display panel, applicable above scheme.
The above content is combining specific optional embodiment to be further described to made by the application, cannot recognize
The specific implementation for determining the application is only limited to these instructions.For those of ordinary skill in the art to which this application belongs,
Without departing from the concept of this application, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the application
Protection scope.
Claims (10)
1. a kind of gamma circuit, which is characterized in that the gamma circuit includes:
Internal reference voltage module, including the first reference voltage unit and the second reference voltage unit；
Number turns analog module, and with the internal reference voltage module couples, it includes at least two that the number, which turns analog module,
Number turns analogue unit to export at least two different gamma electric voltages, and each number turns analogue unit and is connected to institute
State the first reference voltage unit and/or the second reference voltage unit；
Wherein, the voltage value that the voltage value of the first reference voltage unit output and second reference voltage unit export is not
Together.
2. a kind of gamma circuit as described in claim 1, which is characterized in that the gamma circuit includes that buffer and fixation are deposited
Reservoir, and the bi-directional serial bus being connect with the fixed memory and buffer；
It further includes at least two buffers that the number, which turns analog module, and the output end of the buffer is connected to the number and turns
Analogue unit, the input terminal that each number turns the output end and each buffer of analogue unit connect one to one.
3. a kind of gamma circuit as described in claim 1, which is characterized in that the voltage of the first reference voltage unit output
Value is the first reference voltage；The voltage value of the second reference voltage unit output is the second reference voltage；
It includes that the first number turns analogue unit and the second number turns analogue unit, first number that the number, which turns analog module,
The gamma electric voltage for turning analogue unit output is greater than the gamma electric voltage that second number turns analogue unit output；
First reference voltage is greater than second reference voltage.
4. a kind of gamma circuit as claimed in claim 3, which is characterized in that first number, which turns analogue unit, N number of, institute
Stating the second number and turning analogue unit has M；
The gamma electric voltage that first number turns analogue unit output is more than or equal to second reference voltage, is less than described first
Reference voltage；The gamma electric voltage that described second digital revolving die intends voltage output is less than or equal to second reference voltage；
The positive ends that each first number turns analogue unit are connect with first reference voltage unit, and each described
The negative polarity end that one number turns analogue unit is connect with second reference voltage unit；
The positive ends that each second number turns analogue unit are connect with first reference voltage unit, and each described
Two numbers turn the negative polarity end ground connection of analogue unit；
Or each first number turns the positive ends of analogue unit and connect with first reference voltage unit, Mei Gesuo
State the negative polarity end ground connection that the first number turns analogue unit；
The positive ends that each second number turns analogue unit are connect with second reference voltage unit, and each described
Two numbers turn the negative polarity end ground connection of analogue unit；
M, N is the positive integer more than or equal to 1.
5. a kind of gamma circuit as claimed in claim 3, which is characterized in that first number, which turns analogue unit, N number of, institute
Stating the second number and turning analogue unit has M；
The gamma electric voltage that first number turns analogue unit output is more than or equal to the second reference voltage, is less than first reference
Voltage；The gamma electric voltage that described second digital revolving die intends voltage output is less than or equal to second reference voltage；
The positive ends that each first number turns analogue unit are connect with first reference voltage unit, and each described
The negative polarity end that one number turns analogue unit is connect with second reference voltage unit；
The positive ends that each second number turns analogue unit are connect with second reference voltage unit, and each described
Two numbers turn the negative polarity end ground connection of analogue unit；
M, N is the positive integer more than or equal to 1.
6. a kind of gamma circuit as claimed in claim 3, which is characterized in that first reference voltage is second reference
Twice of voltage；
The gamma electric voltage that first number turns analogue unit output is less than or equal to first reference voltage, and is greater than second ginseng
Examine voltage；
The gamma electric voltage that second number turns analogue unit output is less than or equal to second reference voltage.
7. a kind of gamma circuit as described in claim 4-6 any one, which is characterized in that the M and N meets following public
Formula:
M+N=14.
8. a kind of gamma circuit as claimed in claim 5, which is characterized in that the gamma circuit includes buffer, described temporary
The data that storage exports 10bit turn analog module to the number, to complete digital-to-analogue conversion；
The accuracy computation of the gamma electric voltage of the first D/A conversion unit output meets following formula:
LSB=(V_REF-V_HREF)/(2^10-1)=V_HREF/ (2^10-1), Gam=V_REF/1023*n+V_HVEF；
The accuracy computation of the gamma electric voltage of the second D/A conversion unit output meets following formula:
LSB=V_HREF/ (2^10-1), Gam=V_HREF/1023*n；
Wherein, LSB is minimum resolution voltage, and V_REF is the first reference voltage, and V_HREF is the second reference voltage, and Gam is defeated
Gamma electric voltage value out, n are the positive integers in 0~1023.
9. a kind of driving circuit, including gamma circuit as claimed in any of claims 1 to 8 in one of claims, the driving circuit is also
Including data drive circuit, the gamma circuit exports gamma electric voltage to the data drive circuit.
10. a kind of display device, including the display that driving circuit as claimed in claim 9 and the driving circuit drive
Panel.
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| CN201910219880.4A CN109817178B (en) | 2019-03-22 | 2019-03-22 | Gamma circuit, driving circuit and display device |
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| CN201910219880.4A CN109817178B (en) | 2019-03-22 | 2019-03-22 | Gamma circuit, driving circuit and display device |
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| CN110459183A (en) * | 2019-06-11 | 2019-11-15 | 惠科股份有限公司 | A kind of gamma circuitry, driving circuit and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459183A (en) * | 2019-06-11 | 2019-11-15 | 惠科股份有限公司 | A kind of gamma circuitry, driving circuit and display device |
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| Publication number | Publication date |
|---|---|
| CN109817178B (en) | 2021-06-11 |
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