CN106448610A - Method for solving color shift of liquid crystal display screen under low-brightness signal condition - Google Patents
Method for solving color shift of liquid crystal display screen under low-brightness signal condition Download PDFInfo
- Publication number
- CN106448610A CN106448610A CN201611143123.6A CN201611143123A CN106448610A CN 106448610 A CN106448610 A CN 106448610A CN 201611143123 A CN201611143123 A CN 201611143123A CN 106448610 A CN106448610 A CN 106448610A
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- China
- Prior art keywords
- voltage
- brightness signal
- gamma
- low brightness
- liquid crystal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- G09G3/3696—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
- 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
Abstract
The invention discloses a method for solving color shift of a liquid crystal display screen under a low-brightness signal condition. The method includes that a gamma correction voltage value in low-brightness signal intensity is adjusted equally-proportionally so as to increase driving voltage and a torsional angle in the low-brightness signal condition, and accordingly liquid crystal color is compensated and color shift of the liquid crystal display screen is avoided. The method has the advantage that compensation to the color shift of the liquid crystal display screen under the low-brightness signal condition can be realized.
Description
Technical field
The present invention relates to LCDs brightness regulation, in particular it relates to solve under LCDs low brightness signal partially
The method of color.
Background technology
In the case of LCDs low brightness signal, because the torsion inertia of liquid crystal is larger.The initial driving needing
Voltage is higher, and the torsion inertia of liquid crystal molecule is also variant.The windup-degree of therefore different liquid crystals is different, such dark field signal
Brightness low, obvious colour cast in the dark balance under low signal brightness simultaneously, and cannot be mended with normal color lamp color-complementing method
Repay.
Content of the invention
It is an object of the invention to provide a kind of method solving colour cast under LCDs low brightness signal, solve liquid crystal
Under display screen low brightness signal, the method for colour cast can realize the colour cast complementary color under LCDs low brightness signal.
To achieve these goals, the invention provides a kind of solve LCDs low brightness signal under colour cast side
Method, the method includes：
Gamma correction magnitude of voltage under low brightness signal intensity is adjusted by equal proportion, to improve the drive under low brightness signal
Galvanic electricity pressure and windup-degree, thus compensate liquid crystal color so that liquid crystal display screen not colour cast.
Preferably, improve the driving voltage under low brightness signal and the method for windup-degree includes：
By the picture signal that the DA translation circuit of TCON plate is sent is carried out with the nonlinear transformation close to S-shaped, pixel
Voltage and gamma-corrected voltage synthesis superposition obtain resultant voltage, resultant voltage are added to the display unit of liquid crystal display screen.
Preferably, chip is produced by gamma power supply and produce gamma-corrected voltage, described gamma power supply produces the type of chip
Number be BUF20820AIDCPR.
Preferably, 18 passages that described gamma power supply produces in chip export described gamma-corrected voltage, and in addition 2 passages produce
Raw VCOM voltage, the gamma-corrected voltage of each passage output is different.
Preferably, included by the method that equal proportion adjusts the Gamma correction magnitude of voltage under low brightness signal intensity：
It is compared according to predeterminated voltage benchmark and described resultant voltage, be less than described resultant voltage in predeterminated voltage benchmark
When, reduce Gamma correction magnitude of voltage；When predeterminated voltage benchmark is higher than described resultant voltage, improve Gamma correction magnitude of voltage.
Preferably, produce chip by FPGA to described gamma power supply to be controlled, export different gamma-corrected voltages.
The present invention is allowed to different degrees of increase by finely tuning gamma curve 256 rank low and middle-end 64 rank RGB coefficient, can be more
Mend and secretly balance the problem that cannot take into account.When details in a play not acted out on stage, but told through dialogues brightness is low, gamma curve 256 rank low and middle-end 64 rank RGB gamma value is entered
The lifting of row same degree, is improved with properly increasing driving voltage and windup-degree.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the connection figure of the circuit of colour cast under a kind of solution LCDs low brightness signal that the present invention is described.
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
Traditional color-complementing method is to carry out complementary color using turquoise color lamp, but this complementary color can be expired under conditions of brightness is higher
The requirement of coordinate of standard purity.But when luminance signals are relatively low.Because liquid crystal molecule inertia strengthens.The difference of deflection angle.Need higher
Driving voltage.Traditional color-complementing method cannot meet colour cast problem under low-light level.
The present invention provides a kind of method solving colour cast under LCDs low brightness signal, and the method includes：
Gamma correction magnitude of voltage under low brightness signal intensity is adjusted by equal proportion, to improve the drive under low brightness signal
Galvanic electricity pressure and windup-degree, thus compensate liquid crystal color so that liquid crystal display screen not colour cast.
By way of above-mentioned, make the normal no obvious colour cast of signal colour under low-light level, thus meet user requiring.
The present invention is allowed to different degrees of increase by finely tuning gamma curve 256 rank low and middle-end 64 rank RGB coefficient, can be more
Mend and secretly balance the problem that cannot take into account.When details in a play not acted out on stage, but told through dialogues brightness is low, gamma curve 256 rank low and middle-end 64 rank RGB gamma value is entered
The lifting of row same degree, is improved with properly increasing driving voltage and windup-degree.
Below in conjunction with accompanying drawing 1, the application is further detailed, in order to improve the scope of application of the application, especially
Realized using following specific embodiments.
In a kind of specific embodiment of the present invention, in order to improve driving voltage and torsion angle under low brightness signal
Degree, the method includes：
By the picture signal that the DA translation circuit of TCON plate is sent is carried out with the nonlinear transformation close to S-shaped, pixel
Voltage and gamma-corrected voltage synthesis superposition obtain resultant voltage, resultant voltage are added to the display unit of liquid crystal display screen.
By way of above-mentioned, the input-output curve of liquid crystal display systems is finally made to meet actual requirement.Make liquid crystal display screen
Reproduction restores well arranged coloury image.
In this kind of embodiment, chip is produced by gamma power supply and produces gamma-corrected voltage, described gamma power supply produces
Model BUF20820AIDCPR of raw chip.
In this kind of embodiment, 18 passages that described gamma power supply produces in chip export described gamma-corrected voltage,
Other 2 passages produce VCOM voltage, and the gamma-corrected voltage of each passage output is different.
The generation of gamma electric voltage value is that professional gamma power supply produces chip first, is exported different by said chip
Gamma electric voltage.
Wherein, the magnitude of voltage that V1～V16 produces for gamma chip.Being communicated by the SPI of FPGA can be with gamma power supply core
The 18 of piece, 19 feet carry out communicating the different gamma value of output,.By finely tuning gamma value under low-light level, i.e. fine adjustment V1～V4
Magnitude of voltage is changed the colour cast problem under low brightness signal.
In this kind of embodiment, by the method for the Gamma correction magnitude of voltage under equal proportion adjustment low brightness signal intensity
Can include：
It is compared according to predeterminated voltage benchmark and described resultant voltage, be less than described resultant voltage in predeterminated voltage benchmark
When, reduce Gamma correction magnitude of voltage；When predeterminated voltage benchmark is higher than described resultant voltage, improve Gamma correction magnitude of voltage.
By way of above-mentioned, it is possible to achieve the adjustment of Gamma correction voltage.
In this kind of embodiment, chip is produced to described gamma power supply by FPGA and is controlled, export different gals
Horse correction voltage.
Describe the preferred embodiment of the present invention above in association with accompanying drawing in detail, but, the present invention is not limited to above-mentioned reality
Apply the detail in mode, in the range of the technology design of the present invention, multiple letters can be carried out to technical scheme
Monotropic type, these simple variant belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy no longer separately illustrates.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it equally should be considered as content disclosed in this invention.
Claims (6)
1. a kind of method solving colour cast under LCDs low brightness signal is it is characterised in that the method includes：
Gamma correction magnitude of voltage under low brightness signal intensity is adjusted by equal proportion, to improve the electricity of the driving under low brightness signal
Pressure and windup-degree, thus compensate liquid crystal color so that liquid crystal display screen not colour cast.
2. the method solving colour cast under LCDs low brightness signal according to claim 1 is it is characterised in that improve
The method of the driving voltage under low brightness signal and windup-degree includes：
By the picture signal that the DA translation circuit of TCON plate is sent is carried out with the nonlinear transformation close to S-shaped, pixel voltage
Obtain resultant voltage with gamma-corrected voltage synthesis superposition, resultant voltage is added to the display unit of liquid crystal display screen.
3. the method solving colour cast under LCDs low brightness signal according to claim 2 is it is characterised in that pass through
Gamma power supply produces chip and produces gamma-corrected voltage, and described gamma power supply produces model BUF20820AIDCPR of chip.
4. according to claim 3 solve LCDs low brightness signal under colour cast method it is characterised in that
18 passages that described gamma power supply produces in chip export described gamma-corrected voltage, and in addition 2 passages produce VCOM voltage,
The gamma-corrected voltage of each passage output is different.
5. the method solving colour cast under LCDs low brightness signal according to claim 2 is it is characterised in that pass through
The method that equal proportion adjusts the Gamma correction magnitude of voltage under low brightness signal intensity includes：
It is compared according to predeterminated voltage benchmark and described resultant voltage, when predeterminated voltage benchmark is less than described resultant voltage,
Reduce Gamma correction magnitude of voltage；When predeterminated voltage benchmark is higher than described resultant voltage, improve Gamma correction magnitude of voltage.
6. the method solving colour cast under LCDs low brightness signal according to claim 3 is it is characterised in that pass through
FPGA produces chip to described gamma power supply and is controlled, and exports different gamma-corrected voltages.
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| CN201611143123.6A CN106448610B (en) | 2016-12-13 | 2016-12-13 | The method for solving colour cast under liquid crystal display low brightness signal |
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| CN201611143123.6A CN106448610B (en) | 2016-12-13 | 2016-12-13 | The method for solving colour cast under liquid crystal display low brightness signal |
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| CN106448610A true CN106448610A (en) | 2017-02-22 |
| CN106448610B CN106448610B (en) | 2019-02-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110648628A (en) * | 2019-09-29 | 2020-01-03 | 联想(北京)有限公司 | Display processing method, display processing device and electronic equipment |
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| JP2006058603A (en) * | 2004-08-20 | 2006-03-02 | Sony Corp | Flat display device and driving method for flat display device |
| CN1953032A (en) * | 2005-10-21 | 2007-04-25 | 神基科技股份有限公司 | Gamma correction and system with this gamma correction |
| CN101419783A (en) * | 2007-10-22 | 2009-04-29 | 中华映管股份有限公司 | Gamma curve correcting method |
| CN101556774A (en) * | 2008-04-10 | 2009-10-14 | 北京京东方光电科技有限公司 | Device and method for driving liquid crystal display |
| CN102347005A (en) * | 2010-07-30 | 2012-02-08 | 奇美电子股份有限公司 | Image adjusting method and device |
| CN102708813A (en) * | 2011-05-12 | 2012-10-03 | 京东方科技集团股份有限公司 | Liquid crystal display device and liquid crystal display method |
| CN105895044A (en) * | 2016-06-07 | 2016-08-24 | 深圳市华星光电技术有限公司 | Liquid crystal display and method for improving large view angle color bias of liquid crystal display |
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2016
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Patent Citations (7)
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| JP2006058603A (en) * | 2004-08-20 | 2006-03-02 | Sony Corp | Flat display device and driving method for flat display device |
| CN1953032A (en) * | 2005-10-21 | 2007-04-25 | 神基科技股份有限公司 | Gamma correction and system with this gamma correction |
| CN101419783A (en) * | 2007-10-22 | 2009-04-29 | 中华映管股份有限公司 | Gamma curve correcting method |
| CN101556774A (en) * | 2008-04-10 | 2009-10-14 | 北京京东方光电科技有限公司 | Device and method for driving liquid crystal display |
| CN102347005A (en) * | 2010-07-30 | 2012-02-08 | 奇美电子股份有限公司 | Image adjusting method and device |
| CN102708813A (en) * | 2011-05-12 | 2012-10-03 | 京东方科技集团股份有限公司 | Liquid crystal display device and liquid crystal display method |
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