CN107731191A - Gamma circuits and liquid crystal panel - Google Patents
Gamma circuits and liquid crystal panel Download PDFInfo
- Publication number
- CN107731191A CN107731191A CN201711131105.0A CN201711131105A CN107731191A CN 107731191 A CN107731191 A CN 107731191A CN 201711131105 A CN201711131105 A CN 201711131105A CN 107731191 A CN107731191 A CN 107731191A
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- Prior art keywords
- vcom
- analog converter
- voltages
- digital analog
- dac3
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Classifications
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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
- 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
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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 circuits and liquid crystal panel.The Gamma circuits are provided with the maximum (VCOM for adjusting VCOM voltagesmax) the first digital analog converter (DAC1), the minimum value (VCOM for adjusting VCOM voltagesmin) the second digital analog converter (DAC2) and for the maximum (VCOM to VCOM voltagesmax) with the minimum value (VCOM of VCOM voltagesmin) difference be finely divided to adjust the 3rd digital analog converter (DAC3) of the step-length of VCOM voltages, the fine tuning scope of VCOM voltages is enabled to become big, greatly improve the precision of VCOM voltages, reduce the step-length of VCOM voltages, reduce due to liquid crystal panel flash phenomenon caused by different C/B differences, optimize display effect.
Description
Technical field
The present invention relates to technical field of liquid crystal display, more particularly to a kind of Gamma circuits and liquid crystal panel.
Background technology
Liquid crystal display panel (Liquid Crystal Display, LCD), abbreviation liquid crystal panel, have fuselage it is thin, save
The many merits such as electric, radiationless, obtain widely applying, such as：LCD TV, smart mobile phone, digital camera, tablet personal computer,
Computer screen or notebook computer screen etc., occupy an leading position in flat display field.
The operation principle of liquid crystal panel is in thin-film transistor array base-plate (Thin Film Transistor Array
Substrate, TFT Array Substrate) liquid crystal point is poured between colored filter substrate (Color Filter, CF)
Son, and apply driving voltage on two plate bases to control the direction of rotation of liquid crystal molecule, the light of backlight module is reflected
To produce picture.The manufacturing process of liquid crystal panel generally comprises：Leading portion array coloured silk film processing procedure, stage casing into box (Cell) processing procedure and after
Section module group assembling processing procedure.
The machine separated for the wiring board (X/B) being arranged along the horizontal in liquid crystal panel with control board (C/B), X/B
It is to separate shipment with C/B, different C/B itself has error, each C/B analog power electricity due to elements such as resistance, IC
Pressure (VAA), reference voltage (VREF), common electric voltage (VCOM) etc. can have some errors, therefore the collocation of same liquid crystal panel is not
Optimal VCOM voltages with C/B are also different.
Producing line different C/B are adjusted after best picture flicker (Flicker) relevant parameter be the flash memory for existing X/B
(Flash) in, by the different C/B that arranges in pairs or groups at random during shipment, and different C/B VAA voltages, VREF voltages, VCOM voltages have
Difference, the film flicker situation of liquid crystal panel is caused to be had differences because arranging in pairs or groups different C/B.When liquid crystal cross-pressure to approach human eye
During the frequency shift of reaction speed, because GTG changes, beholder will feel film flicker phenomenon, if electric during polarity inversion
Pressure is asymmetric serious, and film flicker can be more serious.
In order to eliminate flicker, it is necessary to which VCOM voltages are adjusted using Gamma circuits.Fig. 1 show a kind of existing
Gamma circuits, including a digital analog converter DAC, a comparator U1, a metal-oxide-semiconductor Q1, a voltage follower U2 and first resistor
R1, second resistance R2 and 3rd resistor R3, wherein the digital analog converter DAC inputs access supply voltage VAA, output end electricity
Property connection comparator U1 positive input terminal；Comparator U1 negative input end is via 3rd resistor R3Ground connection, output end are electrically connected with
Metal-oxide-semiconductor Q1 grid；Metal-oxide-semiconductor Q1 source electrode is electrically connected with comparator U1 negative input end, and drain electrode is electrically connected with voltage follower
U2 positive input terminal；First resistor R1 first end access supply voltage VAA, the second end series connection second resistance R2 first end,
Second resistance R2 the second end ground connection, and first resistor R1 and second resistance R2 series connection node is electrically connected with metal-oxide-semiconductor Q1 leakage
Pole；Voltage follower U2 output end output VCOM voltages, negative input end access VCOM voltage feedback signals VCOMFB。
For the existing Gamma circuits shown in Fig. 1, VCOM voltages can be calculated by following formula：
VCOM=R2/(R1+R2)×[VAA-VAA×R1×(n+1)/2560×R3]
Wherein, n represents the bit number of the digital analog converter DAC, supply voltage VAA management and control is generally in the range of 15.3 ±
0.3V, deviation 0.6V.
It can be seen that by changing first resistor R1, second resistance R2 and 3rd resistor R3Size can adjust VCOM voltages,
But this adjustment mode is more complicated, and the precision of VCOM voltages is not high, is not easy to control.
The content of the invention
It is an object of the invention to provide a kind of Gamma circuits, can greatly improve the precision of VCOM voltages, reduce VCOM
The step-length of voltage, reduce due to liquid crystal panel flash phenomenon caused by different C/B differences, optimize display effect.
Another object of the present invention is to provide a kind of liquid crystal panel, the precision of its VCOM voltage is higher, step-length is smaller, liquid
Crystal panel flicker frequency is relatively low, and display effect is preferable.
To achieve the above object, present invention firstly provides a kind of Gamma circuits, including the first digital analog converter, the second number
Weighted-voltage D/A converter, the 3rd digital analog converter and voltage follower；
The input access VREF voltages of first digital analog converter, output end are electrically connected with the 3rd digital analog converter
First input end, exported for adjusting the maximum of VCOM voltages, and by the maximum of VCOM voltages to the 3rd digital analog converter；
The input access VREF voltages of second digital analog converter, output end are electrically connected with the 3rd digital analog converter
Second input, exported for adjusting the minimum value of VCOM voltages, and by the minimum value of VCOM voltages to the 3rd digital analog converter；
The first input end and the second input of 3rd digital analog converter be respectively connected to the maximums of VCOM voltages with
The minimum value of VCOM voltages, the difference for the maximum to VCOM voltages and the minimum value of VCOM voltages are finely divided to adjust
The step-length of VCOM voltages；
The positive input terminal of the voltage follower is electrically connected with the output end of the 3rd digital analog converter, and voltage follower is born
The output end of input and voltage follower is electrically connected with, the output end output VCOM voltages of voltage follower.
The management and control scope of the VREF voltages is 14.62 ± 0.15V.
The bit number of first digital analog converter is identical with the bit number of the second digital analog converter.
The bit number of first digital analog converter and the second digital analog converter is 7.
The bit number of the bit number and the first digital analog converter of 3rd digital analog converter is identical or different.
The bit number of 3rd digital analog converter is 7.
3rd digital analog converter adjusts the step-length of VCOM voltages to (VCOMmax-VCOMmin)/128, wherein,
VCOMmaxRepresent the maximum of VCOM voltages, VCOMminRepresent the minimum value of VCOM voltages.
The voltage follower is powered by accessing VREF voltages and ground connection.
First digital analog converter adjusts the maximum of VCOM voltages by I2C；Second digital analog converter leads to
I2C is crossed to adjust the minimum value of VCOM voltages.
The present invention also provides a kind of liquid crystal panel, including above-mentioned Gamma circuits.
Beneficial effects of the present invention：Gamma circuits provided by the invention, are provided with the maximum for adjusting VCOM voltages
The first digital analog converter, minimum value for adjusting VCOM voltages the second digital analog converter and for VCOM voltages most
The difference of big value and the minimum value of VCOM voltages is finely divided to adjust the 3rd digital analog converter of the step-length of VCOM voltages, can
So that the fine tuning scope of VCOM voltages becomes big, greatly improve the precision of VCOM voltages, reduce the step-length of VCOM voltages, reduce due to
Liquid crystal panel flash phenomenon caused by different C/B differences, optimize display effect.Liquid crystal panel provided by the invention, including it is above-mentioned
Gamma circuits, VCOM voltages are adjusted using above-mentioned Gamma circuits, enable to the precision of VCOM voltages is higher, step-length compared with
Small, liquid crystal panel flash frequency is relatively low, and display effect is preferable.
Brief description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and accompanying drawing, however accompanying drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In accompanying drawing,
Fig. 1 is the circuit diagram of existing Gamma circuits；
Fig. 2 is the circuit diagram of the Gamma circuits of the present invention.
Embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferable to carry out for the present invention
Example and its accompanying drawing are described in detail.
Referring to Fig. 1, present invention firstly provides a kind of Gamma circuits, including the first digital analog converter DAC1, the second digital-to-analogue
Converter DAC2, the 3rd digital analog converter DAC3 and voltage follower U.
The input access VREF voltages of the first digital analog converter DAC1, output end are electrically connected with the 3rd digital-to-analogue conversion
Device DAC3 first input end, for adjusting the maximum VCOM of VCOM voltagesmax, and by the maximum VCOM of VCOM voltagesmax
Export to the 3rd digital analog converter DAC3；
The input access VREF voltages of the second digital analog converter DAC2, output end are electrically connected with the 3rd digital-to-analogue conversion
Device DAC3 the second input, for adjusting the minimum value VCOM of VCOM voltagesmin, and by the minimum value VCOM of VCOM voltagesmin
Export to the 3rd digital analog converter DAC3；
The first input end and the second input of the 3rd digital analog converter DAC3 are respectively connected to the maximum of VCOM voltages
Value VCOMmaxWith the minimum value VCOM of VCOM voltagesmin, for the maximum VCOM to VCOM voltagesmaxWith the minimum of VCOM voltages
Value VCOMminDifference be finely divided to adjust the step-length of VCOM voltages；
The positive input terminal of the voltage follower U is electrically connected with the 3rd digital analog converter DAC3 output end, voltage follow
Device U negative input end is electrically connected with voltage follower U output end, voltage follower U output end output VCOM voltages, and
And voltage follower U is powered by accessing VREF voltages and ground connection.
Specifically, the management and control scope of the VREF voltages is 14.62 ± 0.15V, deviation 0.3V, is adopted than prior art
Supply voltage VAA precision is higher.
The bit number (Bits) of the first digital analog converter DAC1 is identical with the second digital analog converter DAC2 bit number,
Such as it is all 6Bits, 7Bits or 8Bits；The bit number and the first digital analog converter DAC1 of the 3rd digital analog converter DAC3
Bit number it is identical or different.Preferably, the first digital analog converter DAC1 and the second digital analog converter DAC2 is
7Bits, the 3rd digital analog converter DAC3 are also 7Bits, that is to say, that the first digital analog converter DAC1 can be used
0000000~1111111 this 128 7 bits adjust the maximum VCOM of VCOM voltages to correspond tomax, second number
Weighted-voltage D/A converter DAC2 equally can adjust VCOM voltages using 0000000~1111111 this 128 7 bits to correspond to
Minimum value VCOMmin, certainly, the maximum VCOM of the VCOM voltagesmaxMore than the minimum value VCOM of VCOM voltagesmin, but two
The difference of person can not be too big；The 3rd digital analog converter DAC3 can adjust the step-length of VCOM voltages to (VCOMmax-
VCOMmin)/128.VCOM can be adjusted by adjusting the first digital analog converter DAC1 and the second digital analog converter DAC2max-
VCOMminValue, and then the step-length of VCOM voltages can be adjusted so that the fine tuning scope of VCOM voltages becomes big, can greatly improve
The precision of VCOM voltages, reduce the step-length of VCOM voltages, reduce due to liquid crystal panel flash phenomenon caused by different C/B differences,
Optimize display effect.
Further, the first digital analog converter DAC1 passes through IC bus (Inter-Integrated
Circuit, I2C) adjust the maximum VCOM of VCOM voltagesmax；The second digital analog converter DAC2 is adjusted by I2C
The minimum value VCOM of VCOM voltagesmin。
Based on same inventive concept, the present invention also provides a kind of liquid crystal panel, including above-mentioned Gamma electricity as shown in Figure 2
Road, enables to that the precision of VCOM voltages is higher, step-length is smaller, and liquid crystal panel flash frequency is relatively low, and display effect is preferable, herein
Repeated description no longer is carried out to the Gamma circuits.
In summary, Gamma circuits of the invention, the first digital-to-analogue for being provided with the maximum for adjusting VCOM voltages turn
Parallel operation, the second digital analog converter of minimum value for adjusting VCOM voltages and for the maximum to VCOM voltages and VCOM electricity
The difference of the minimum value of pressure is finely divided to adjust the 3rd digital analog converter of the step-length of VCOM voltages, enables to VCOM voltages
Fine tuning scope become big, greatly improve the precision of VCOM voltages, reduce the step-length of VCOM voltages, reduce due to different C/B differences
Caused by liquid crystal panel flash phenomenon, optimize display effect.The liquid crystal panel of the present invention, including above-mentioned Gamma circuits, in utilization
Gamma circuits are stated to adjust VCOM voltages, enable to that the precision of VCOM voltages is higher, step-length is smaller, liquid crystal panel flash frequency
Rate is relatively low, and display effect is preferable.
It is described above, for the person of ordinary skill of the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the claim of the present invention
Protection domain.
Claims (10)
- A kind of 1. Gamma circuits, it is characterised in that including the first digital analog converter (DAC1), the second digital analog converter (DAC2), 3rd digital analog converter (DAC3) and voltage follower (U)；The input access VREF voltages of first digital analog converter (DAC1), output end are electrically connected with the 3rd digital analog converter (DAC3) first input end, for adjusting the maximum (VCOM of VCOM voltagesmax), and by the maximum of VCOM voltages (VCOMmax) export to the 3rd digital analog converter (DAC3)；The input access VREF voltages of second digital analog converter (DAC2), output end are electrically connected with the 3rd digital analog converter (DAC3) the second input, for adjusting the minimum value (VCOM of VCOM voltagesmin), and by the minimum value of VCOM voltages (VCOMmin) export to the 3rd digital analog converter (DAC3)；The first input end and the second input of 3rd digital analog converter (DAC3) are respectively connected to the maximum of VCOM voltages (VCOMmax) with the minimum value (VCOM of VCOM voltagesmin), for the maximum (VCOM to VCOM voltagesmax) and VCOM voltages Minimum value (VCOMmin) difference be finely divided to adjust the step-length of VCOM voltages；The positive input terminal of the voltage follower (U) is electrically connected with the output end of the 3rd digital analog converter (DAC3), voltage follow The negative input end of device (U) is electrically connected with the output end of voltage follower (U), the output end output VCOM of voltage follower (U) Voltage.
- 2. Gamma circuits as claimed in claim 1, it is characterised in that the management and control scope of the VREF voltages be 14.62 ± 0.15V。
- 3. Gamma circuits as claimed in claim 1, it is characterised in that the bit number of first digital analog converter (DAC1) It is identical with the bit number of the second digital analog converter (DAC2).
- 4. Gamma circuits as claimed in claim 3, it is characterised in that first digital analog converter (DAC1) and the second number The bit number of weighted-voltage D/A converter (DAC2) is 7.
- 5. Gamma circuits as claimed in claim 4, it is characterised in that the bit number of the 3rd digital analog converter (DAC3) It is identical or different with the bit number of the first digital analog converter (DAC1).
- 6. Gamma circuits as claimed in claim 5, it is characterised in that the bit number of the 3rd digital analog converter (DAC3) For 7.
- 7. Gamma circuits as claimed in claim 6, it is characterised in that the 3rd digital analog converter (DAC3) is electric by VCOM The step-length of pressure is adjusted to (VCOMmax-VCOMmin)/128, wherein, VCOMmaxRepresent the maximum of VCOM voltages, VCOMminRepresent The minimum value of VCOM voltages.
- 8. Gamma circuits as claimed in claim 1, it is characterised in that the voltage follower (U) is by accessing VREF voltages And ground connection is powered.
- 9. Gamma circuits as claimed in claim 1, it is characterised in that first digital analog converter (DAC1) by I2C come Adjust the maximum (VCOM of VCOM voltagesmax)；Second digital analog converter (DAC2) adjusts VCOM voltages by I2C Minimum value (VCOMmin)。
- 10. a kind of liquid crystal panel, it is characterised in that including the Gamma circuits as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711131105.0A CN107731191A (en) | 2017-11-15 | 2017-11-15 | Gamma circuits and liquid crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711131105.0A CN107731191A (en) | 2017-11-15 | 2017-11-15 | Gamma circuits and liquid crystal panel |
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| Publication Number | Publication Date |
|---|---|
| CN107731191A true CN107731191A (en) | 2018-02-23 |
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ID=61216151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711131105.0A Pending CN107731191A (en) | 2017-11-15 | 2017-11-15 | Gamma circuits and liquid crystal panel |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677467A (en) * | 2004-03-30 | 2005-10-05 | 索尼株式会社 | Driving circuit of flat display device, and flat display device |
| CN101140735A (en) * | 2006-09-04 | 2008-03-12 | 意法半导体研发（上海）有限公司 | Method for integrating programmable resistor array regulate VCOM electrical level |
| CN101174837A (en) * | 2006-11-02 | 2008-05-07 | 恩益禧电子股份有限公司 | Digital analogue converter circuit, data dirver and display using the same |
| CN101588181A (en) * | 2008-05-23 | 2009-11-25 | 恩益禧电子股份有限公司 | D/A conversion circuit and data driver and display unit |
| CN103003865A (en) * | 2010-03-22 | 2013-03-27 | 苹果公司 | Shared voltage divider generating reference voltages for the gamma and common electrode voltages |
| US9224351B1 (en) * | 2010-01-18 | 2015-12-29 | Iml International | Digitally controlled voltage generator |
| CN105489184A (en) * | 2016-01-22 | 2016-04-13 | 京东方科技集团股份有限公司 | Gamma voltage control system, control method and display device |
-
2017
- 2017-11-15 CN CN201711131105.0A patent/CN107731191A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677467A (en) * | 2004-03-30 | 2005-10-05 | 索尼株式会社 | Driving circuit of flat display device, and flat display device |
| CN101140735A (en) * | 2006-09-04 | 2008-03-12 | 意法半导体研发（上海）有限公司 | Method for integrating programmable resistor array regulate VCOM electrical level |
| CN101174837A (en) * | 2006-11-02 | 2008-05-07 | 恩益禧电子股份有限公司 | Digital analogue converter circuit, data dirver and display using the same |
| CN101588181A (en) * | 2008-05-23 | 2009-11-25 | 恩益禧电子股份有限公司 | D/A conversion circuit and data driver and display unit |
| US9224351B1 (en) * | 2010-01-18 | 2015-12-29 | Iml International | Digitally controlled voltage generator |
| CN103003865A (en) * | 2010-03-22 | 2013-03-27 | 苹果公司 | Shared voltage divider generating reference voltages for the gamma and common electrode voltages |
| CN105489184A (en) * | 2016-01-22 | 2016-04-13 | 京东方科技集团股份有限公司 | Gamma voltage control system, control method and display device |
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Application publication date: 20180223 |