CN109036326A - A kind of gamma curve method and device adjusting display panel - Google Patents
A kind of gamma curve method and device adjusting display panel Download PDFInfo
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- CN109036326A CN109036326A CN201811238631.1A CN201811238631A CN109036326A CN 109036326 A CN109036326 A CN 109036326A CN 201811238631 A CN201811238631 A CN 201811238631A CN 109036326 A CN109036326 A CN 109036326A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- 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
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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
- 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
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- 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 invention discloses a kind of gamma curve method and device for adjusting display panel, the present invention when the public electrode voltages of display panel are predeterminated voltage, carries out image sampling to display panel, to obtain the sample image of different color channels first；Then the output brightness value of each sample image is measured respectively；The current gamma value of display panel is calculated further according to the output brightness value of each sample image；Finally when current gamma value and the difference of default gamma value are greater than default error threshold, the offset of the current gamma curve of display panel is calculated according to difference, and it is adjusted according to current gamma curve of the offset to display panel, the present embodiment can not need to search the algorithm of best gamma electric voltage, without being detected to gamma chip, actual gamma curve value can be measured, and then shorten the adjustment time in faceplate manufacturing process to gamma curve, and it is more accurate to the adjustment result of the gamma curve of panel, greatly improve the production efficiency of display panel.
Description
Technical field
The present invention relates to field of liquid crystal panel display more particularly to a kind of gamma curve methods and dress for adjusting display panel
It sets.
Background technique
Gamma curve (Chinese name is referred to as gamma curve) is the most important photoelectric conversion curve of liquid crystal display panel, one
As for, when the practical gamma value of liquid crystal display panel is equal to 2.2, could the existing display system of effective compensation, allow human eye to obtain
Optimal display effect is obtained, however, display manufacturer's difficulty in the control of gamma curve is quite high, includes control display module
Cell, electro-conductive glass ITO CD and display panel
Pre-tilt angle pre-tilt angle etc. can influence the gamma curve characteristic of display, lead to each panel
Factory gamma curve variation range quite greatly, a good and quick gamma-curve correction method, for improve display
Gamma characteristic be considerable.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
The main purpose of the present invention is to provide a kind of gamma curve methods for adjusting display panel, it is intended to solve current liquid
It is how rapidly and accurately right when the control difficulty of the LCD panel gamma curve of display panel in the production process is higher
The problem of gamma curve is adjusted, characteristic to improve display panel.
To achieve the above object, the present invention provides a kind of grayscale method of adjustment of display panel, the method includes with
Lower step:
When the public electrode voltages of display panel are predeterminated voltage, image sampling is carried out to the display panel, to obtain
Take the sample image of different color channels；
The output brightness value of each sample image is measured respectively；
The current gamma value that the display panel is calculated according to the output brightness value of each sample image, according to the current gal
Horse value determines the current gamma curve of the display panel；
When the current gamma value and the difference of default gamma value are greater than default error threshold, calculated according to the difference
The offset of the current gamma curve of the display panel；
It is adjusted according to current gamma curve of the offset to the display panel.
Optionally, when the public electrode voltages in display panel are predeterminated voltage, figure is carried out to the display panel
As sampling, before the sample image to obtain different color channels, the method also includes:
In response to the voltage adjustment instruction of user's input, according to the voltage adjustment instruction by the public of the display panel
Electrode voltage is adjusted to being 255 with grayscale value or grayscale value is 128 corresponding voltages.
Optionally, the current gamma value that the display panel is calculated according to the output brightness value of each sample image, tool
Body includes:
The output brightness value interpolation of each sample image is entered in gamma mathematical model, to calculate working as the display panel
Preceding gamma value；The gamma mathematical model formula T=LGammaIt indicates, wherein Gamma indicates that gamma value, T indicate the defeated of panel
Brightness value out, L indicate the input grayscale value of panel.
Optionally, described to be adjusted according to current gamma curve of the offset to the display panel, it is specific to wrap
It includes:
The offset of gamma value is burned onto the storage chip of the display panel, to the current of the display panel
Gamma curve is adjusted.
Optionally, in the storage chip that the offset of gamma value is burned onto the display panel, to described aobvious
Show that the current gamma curve of panel is adjusted, specifically include:
It is updated, is obtained new according to original display look-up table of the offset of the gamma value to the display panel
Show look-up table；
The new display look-up table is burned onto the storage chip of the display panel, to the display panel
Current gamma curve is adjusted.
In addition, to achieve the above object, the present invention also proposes a kind of gamma curve device for adjusting display panel, the dress
It sets and includes:
Sampling module, for the public electrode voltages in display panel be predeterminated voltage when, to the display panel carry out
Image sampling, to obtain the sample image of different color channels；
Photoelectric conversion module, for measuring the output brightness value of each sample image respectively；
Curve computing module calculates the current gamma of the display panel for the output brightness value according to each sample image
Value；
Compensating module, when for the difference in the current gamma value and default gamma value greater than default error threshold, root
The offset of the current gamma curve of the display panel is calculated according to the difference；
Module is adjusted, for being adjusted according to current gamma curve of the offset to the display panel.
Optionally, described device further include:
Voltage regulator module, the voltage adjustment instruction for inputting in response to user will according to the voltage adjustment instruction
The public electrode voltages of the display panel are adjusted to being 255 with grayscale value or grayscale value is 128 corresponding voltages.
Optionally, the curve computing module, specifically includes:
Interpolation unit, for the input grayscale value interpolation of each white brightness sample image to be entered in gamma mathematical model, with
Calculate the current gamma value of the display panel；The gamma mathematical model formula T=LGammaIt indicates, wherein Gamma table
Show that gamma value, T indicate that the output brightness value of panel, L indicate the input grayscale value of panel.
Optionally, the adjustment module, specifically includes:
Burning unit, for the offset of gamma value to be burned onto the storage chip of the display panel, to described
The current gamma curve of display panel is adjusted.
Optionally, the burning unit specifically includes:
Update subelement, for according to the offset of the gamma value to the original display look-up table of the display panel into
Row updates, and obtains new display look-up table；
Burning subelement, for the new display look-up table to be burned onto the storage chip of the display panel, with
The current gamma curve of the display panel is adjusted.
The present invention when the public electrode voltages of display panel are predeterminated voltage, carry out image to display panel and adopts first
Sample, to obtain the sample image of different color channels；Then the output brightness value of each sample image is measured respectively；Further according to various kinds
The output brightness value of this image calculates the current gamma value of display panel；Finally in the difference of current gamma value and default gamma value
When greater than default error threshold, the offset of the current gamma curve of display panel is calculated according to difference, and according to offset pair
The current gamma curve of display panel is adjusted, and the present embodiment can not need to search the algorithm of best gamma electric voltage, is not necessarily to
Gamma chip is detected, actual gamma curve value can be measured, and then shorten in faceplate manufacturing process to gal
The adjustment time of horse curve, and it is more accurate to the adjustment result of the gamma curve of panel, greatly improve the life of display panel
Produce efficiency.
Detailed description of the invention
There are the schematic diagrames of deviation for the practical gamma curve and standard gamma curve that Fig. 1 is the display panel measured；
Fig. 2 is the structural schematic diagram of photoelectric converting device in an embodiment；
Fig. 3 is a kind of structural block diagram for the gamma curve Installation practice for adjusting display panel of the present invention；
Fig. 4 is the signal of the practical gamma curve in one embodiment of the invention by display panel obtained by interpolation calculation
Figure；
Fig. 5 is a kind of flow diagram for the gamma curve embodiment of the method for adjusting display panel of the present invention.
The object of the invention is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.
Specific embodiment
It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
Currently, display manufacturer's difficulty in the control of gamma curve is quite high, during manufacturing display panel, need
Display module cell, electro-conductive glass ITO CD and pre-tilt angle pre-tilt angle of display panel etc. are managed, it all can shadow
Ring arrive display gamma curve characteristic, the range for causing the gamma curve of each panel factory to change quite greatly, as shown in Figure 1,
The gamma curve of standard should be the gamma curve that gamma value is equal to 2.2,2.2 curve of abbreviation Gamma, but in display panel
Actually generate during, the practical gamma curve of the display panel measured can and 2.2 curve of Gamma there are deviations.
At present in the known technology for the gamma curve for measuring liquid crystal display panel are as follows: need to measure in proper order using sequential manner
Display panel, the gamma curve which measures one group of 8bit of display panel needs 256 seconds, if each panel product requires
Measure 256 seconds or more, the formation efficiency of entire surface board assembly line can be seriously affected.In general, panel factory is at present in order to reduce
Correction time can tie up voltage (usually 5~7 groups of voltage) using gamma chip come the gamma curve of control panel entirety,
By photoelectric converting device shown in Fig. 2 and gamma computing unit, to calculate the gamma curve of display panel to be measured, in turn
Carried out by subsequent correction gamma curve reference, concrete operations process are as follows: the first step, measure gamma electric voltage test point；Second step,
Calculate measuring point gamma electric voltage；Third step searches gamma optimum voltage；4th step carries out gamma electric voltage compensation burning；5th
Step carries out gamma curve verifying.However the efficiency of algorithm of the above-mentioned best gamma electric voltage of search is not high, therefore develops one more
Quick more accurate gamma curve method of adjustment is producing the problem of liquid crystal display panel of high-quality is current urgent need to resolve.
It is a kind of schematic block diagram of gamma curve device for adjusting display panel provided in an embodiment of the present invention referring to Fig. 3,
It is described adjustment display panel gamma curve device include:
Sampling module 10, for the public electrode voltages in display panel be predeterminated voltage when, to the display panel into
Row image sampling, to obtain the sample image of different color channels；
It should be noted that the display panel in the present embodiment can be liquid crystal display panel, the LCD display
Plate is applicable to the display devices such as computer display screen, television display screen and tablet personal computer display screen.
Before the gamma curve for correcting or adjusting display panel to be measured, need first to adjust the display panel to be measured
Vcom voltage is arranged to a predeterminated voltage by Vcom voltage (i.e. public electrode voltages), at this time the Vcom electricity of the display panel
Pressing is fixed；
Specifically, the gamma curve device of the adjustment display panel further includes a voltage regulator module, for responding
In the voltage adjustment instruction of user's input, the public electrode voltages of the display panel are adjusted according to the voltage adjustment instruction
Extremely be 255 with grayscale value or grayscale value is 128 corresponding voltages.
It will be appreciated that the Vcom voltage of display panel is adjusted to grayscale value be 255 or grayscale value is 128 corresponding by user
Voltage when, at this time the image of display panel to be measured be full white image so that it is convenient to display panel to be measured carry out image sampling
To obtain the white brightness sample of signal of sample point.In the concrete realization, after the Vcom voltage of display panel is fixed, this implementation
Example can preferentially obtain the sample image of 5 kinds of different color channels, and the sample image of this 5 kinds of different color channels is sample graph respectively
As A, sample image B, sample image C, sample image D and sample image E.
Photoelectric conversion module 20, for measuring the output brightness value of each sample image respectively；
It will be appreciated that the present embodiment is that photoelectric conversion module 20 can be photoelectric converter as shown in Figure 2, that is, scheme
Photoelectric converter in 2 is integrated in the gamma curve device of the adjustment display panel；Or the photoelectric conversion module 20
It is characterized as an interface of the gamma curve device of the adjustment display panel, the interface and photoelectric converter as shown in Figure 2
Connection；
In the concrete realization, it is bright to measure output corresponding to 5 sample images got in proper order for photoelectric conversion module 20
Angle value T, the brightness that output brightness value, that is, people's naked eyes here are experienced.
It will be appreciated that every sample image (i.e. white brightness sample of signal) includes that an input grayscale L and one are defeated
Brightness T out；The input grayscale is the grayscale that display can identify, which characterizes a kind of objective brightness of reality, that is,
Objectively natural physical quantity in kind, and display can constantly obtain different input voltages, and different input voltages is reacted
Grayscale be different；The output brightness is the impression of human eye brightness.Since people is to the perception right and wrong of the stimulation of nature
Linear, extraneous to reinforce stimulation in certain proportion, for people, stimulation is even increases for this；Similarly, human eye is to nature
Brightness perception is also nonlinear, therefore the brightness of human eye perception and practical objective brightness are not identical, and gamma is bent
Line is the mapping relations for coordinating both the impression of human eye brightness and practical objective natural brightness, in order to coordinate to export
The mapping relations of brightness and both input grayscale, can pass through formula: output valve=input valueGamma, that is, mathematical model of raising the price T
=LGammaReact the relationship between the two, wherein the Gamma in gamma mathematical model indicates gamma value, can refer to Fig. 1, Fig. 1
In horizontal axis coordinate indicate input grayscale L, that is, input value of display panel, the ordinate in Fig. 1 indicates that the output of display panel is bright
Spend T, that is, output valve.
Curve computing module 30 calculates the current gal of the display panel for the output brightness value according to each sample image
Horse value determines the current gamma curve of the display panel according to the current gamma value；
In the concrete realization, it will be inserted into gamma mathematical model in the output brightness value T of above 5 sample images, i.e., it is logical
It crosses interpolation value method and substitutes into formula T=LGammaIn, to calculate the current gamma value of the display panel, and then according to described current
Gamma value determines the current gamma curve of the display panel, as shown in figure 4, the ordinate in Fig. 4 indicates every sample image
Output brightness value T, the current of the display panel can be determined after measuring output brightness value T to every sample image
Gamma curve, the dotted line in Fig. 4 represent the current gamma curve sought by interpolation method；Last available sample image A's
Inputting grayscale is 255 (i.e. R/G/B=255/255/255), and the input grayscale of sample image B is 192 (i.e. R/G/B=192/
192/192), the input grayscale of sample image C is 128 (i.e. R/G/B=128/128/128), and the input grayscale of sample image D is
The input grayscale 0 (being R/G/B=0/0/0) of 64 (i.e. R/G/B=64/64/64), sample image E.
It will be appreciated that the previous gamma value that calculates only needs the defeated of known present image due to not knowing gamma value at present
Brightness value T and input grayscale L can find out current gamma value out；However, the input grayscale L is characterized as the practical sense of display panel
The voltage being subject to, the practical voltage experienced of display panel is determined by Vcom voltage and gamma electric voltage, it is therefore necessary to be measured
Gamma electric voltage, it and is currently to tie up voltage (usually using gamma chip that measuring gamma electric voltage, which is by measuring gamma chip,
5~7 groups of voltages) measure gamma electric voltage, and then the gamma curve of control panel entirety, this measurement gamma chip obtains gamma
The mode of voltage is more complicated and not accurate enough, and the present embodiment is directly around scheme (the no demand gamma for measuring gamma chip
Voltage), then Vcom voltage fixed first measures the corresponding output brightness value T of 5 sample images, then defeated by this 5
Brightness value T can find out practical gamma value by interpolation method out, and efficiency and measurement accuracy can be improved.
Compensating module 40, when for the difference in the current gamma value and default gamma value greater than default error threshold,
The offset of the current gamma curve of the display panel is calculated according to the difference；
It will be appreciated that the gamma curve of TV can be designed at gamma 2.2 (i.e. gamma value is 2.2), it could effectively
Existing display system is compensated, allows human eye to obtain optimal display effect, therefore the default gamma value of the present embodiment is preferably gal
Horse value is 2.2.
Module 50 is adjusted, for being adjusted according to current gamma curve of the offset to the display panel.
Specifically, the adjustment module 50 specifically includes burning unit, described for the offset of gamma value to be burned onto
In the storage chip of display panel, it is adjusted with the current gamma curve to the display panel.Further, burning unit
It specifically includes: updating subelement and burning subelement, update subelement and be used for the offset according to the gamma value to described aobvious
Show that the original display look-up table LUT of panel is updated, obtains new display look-up table LUT；
It in the concrete realization, can be by the original display look-up table LUT of the display panel after the offset for obtaining gamma value
Data corresponding with the offset of the gamma value are quantified as, i.e., according to the offset of the gamma value to the display panel
Original display look-up table LUT is updated, and obtains new display look-up table LUT.Burning subelement is used for the new display
Look-up table LUT is burned onto the storage chip of the display panel, not only adjustable and correct the current of the display panel
Gamma curve may also correct for the white balance of panel.It should be noted that the storage chip of the display panel of the present embodiment is
(Electrically Erasable Programmable read only memory, electric erazable programmable is read-only to be deposited EEPROM
Reservoir).
It will be appreciated that will do it gamma Compensation Analysis if gamma curve is deviated, by the gamma curve school of panel
Just to normal range (NR) (usually 2.2 ± 0.2 gamma), the offset of current gamma curve is finally burned onto panel again
EEPROM, and the step of re-executing measurement verifying current gamma curve.
The present embodiment when the public electrode voltages of display panel are predeterminated voltage, carry out image to display panel and adopts first
Sample, to obtain the sample image of different color channels；Then the output brightness value of each sample image is measured respectively；Further according to various kinds
The output brightness value of this image calculates the current gamma value of display panel；Finally in the difference of current gamma value and default gamma value
When greater than default error threshold, the offset of the current gamma curve of display panel is calculated according to difference, and according to offset pair
The current gamma curve of display panel is adjusted, and the present embodiment can not need to search the algorithm of best gamma electric voltage, is not necessarily to
Gamma chip is detected, actual gamma curve value can be measured, and then shorten in faceplate manufacturing process to gal
The adjustment time of horse curve, and it is more accurate to the adjustment result of the gamma curve of panel, greatly improve the life of display panel
Produce efficiency.
Based on above-mentioned hardware configuration, a kind of gamma curve embodiment of the method for adjusting display panel of the present invention is proposed.
Referring to Fig. 5, Fig. 5 is a kind of flow diagram for the gamma curve embodiment of the method for adjusting display panel of the present invention.
Step S10 carries out image to the display panel and adopts when the public electrode voltages of display panel are predeterminated voltage
Sample, to obtain the sample image of different color channels；
It should be noted that the display panel in the present embodiment can be liquid crystal display panel, the LCD display
Plate is applicable to the display devices such as computer display screen, television display screen and tablet personal computer display screen.
Before the gamma curve for correcting or adjusting display panel to be measured, need first to adjust the display panel to be measured
Vcom voltage is arranged to a predeterminated voltage, at this time the Vcom voltage of the display panel by Vcom voltage, that is, public electrode voltages
It is fixed；
Specifically, the voltage adjustment instruction that the gamma curve device of the adjustment display panel can be inputted in response to user,
The public electrode voltages of the display panel are adjusted to being 255 with grayscale value or grayscale value is according to the voltage adjustment instruction
128 corresponding voltages.
It will be appreciated that the Vcom voltage of display panel is adjusted to grayscale value be 255 or grayscale value is 128 corresponding by user
Voltage when, at this time the image of display panel to be measured be full white image so that it is convenient to display panel to be measured carry out image sampling,
Convenient for obtaining the white brightness sample of signal of sample point.In the concrete realization, after the Vcom voltage of display panel is fixed, this reality
The sample image of 5 kinds of different color channels can be obtained by applying example preferentially, and the sample image of this 5 kinds of different color channels is sample respectively
Image A, sample image B, sample image C, sample image D and sample image E.
Step S20 measures the output brightness value of each sample image respectively；
It will be appreciated that the present embodiment can photoelectric converter pair by photoelectric converter as shown in Figure 2, i.e. in Fig. 2
The output brightness value of sample image is measured, and the photoelectric converter can integrate in the gamma song of the adjustment display panel
In line apparatus；
In the concrete realization, by measuring output brightness value T corresponding to get 5 sample images in proper order, here
Output brightness value, that is, brightness for experiencing of people's naked eyes.
It will be understood that, it should be noted that every sample image (i.e. white brightness sample of signal) includes an input
A grayscale L and output brightness T；The input grayscale is the grayscale that display can identify, which characterizes a kind of practical visitor
Brightness, that is, objectively natural physical quantity in kind are seen, and display can constantly obtain different input voltages, different is defeated
Enter the grayscale that voltage is reacted to be different；The output brightness is the impression of human eye brightness.Since people is to the thorn of nature
Sharp perception be it is nonlinear, extraneous to reinforce stimulation in certain proportion, for people, stimulation is even increases for this；Together
Reason, human eye is also nonlinear to natural brightness perception, therefore the brightness of human eye perception and practical objective brightness are not complete
It is exactly the same, gamma curve (i.e. gamma curve) be for coordinate the impression of human eye brightness and practical objective natural brightness this two
The mapping relations of person can pass through formula: output valve in order to coordinate the mapping relations for exporting brightness and inputting grayscale both
=input valueGamma, that is, mathematical model of raising the price T=LGammaReact the relationship between the two, wherein in gamma mathematical model
Gamma indicates gamma value, can refer to Fig. 1, and the horizontal axis coordinate in Fig. 1 indicates input grayscale L, that is, input value of display panel, Fig. 1
In ordinate indicate display panel output brightness T, that is, output valve.
Step S30 calculates the current gamma value of the display panel according to the output brightness value of each sample image, according to institute
State the current gamma curve that current gamma value determines the display panel；
In the concrete realization, it will be inserted into gamma mathematical model in the output brightness value T of above 5 sample images, i.e., it is logical
It crosses interpolation value method and substitutes into formula T=LGammaIn, to calculate the current gamma value of the display panel, and then according to described current
Gamma value determines the current gamma curve of the display panel, as shown in figure 4, measuring the output brightness for arriving every sample image
The current gamma curve of the display panel can be determined after value T, the ordinate in Fig. 4 indicates the output of every sample image
Dotted line in brightness value T, Fig. 4 represents the current gamma curve sought by interpolation method；Last available sample image A's is defeated
Entering grayscale is 255 (i.e. R/G/B=255/255/255), and the input grayscale of sample image B is 192 (i.e. R/G/B=192/192/
192), the input grayscale of sample image C is 128 (i.e. R/G/B=128/128/128), and the input grayscale of sample image D is 64
(i.e. R/G/B=64/64/64), the input grayscale 0 (being R/G/B=0/0/0) of sample image E.
It will be appreciated that the previous gamma value that calculates only needs the defeated of known present image due to not knowing gamma value at present
Brightness value T and input grayscale L can find out current gamma value out；However, the input grayscale L is characterized as the practical sense of display panel
The voltage being subject to, the practical voltage experienced of display panel is determined by Vcom voltage and gamma electric voltage, it is therefore necessary to be measured
Gamma electric voltage, it and is currently to tie up voltage (usually using gamma chip that measuring gamma electric voltage, which is by measuring gamma chip,
5~7 groups of voltages) measure gamma electric voltage, and then the gamma curve of control panel entirety, this measurement gamma chip obtains gamma
The mode of voltage is more complicated and not accurate enough, and the present embodiment is directly around scheme (the no demand gamma for measuring gamma chip
Voltage), then Vcom voltage fixed first measures the corresponding output brightness value T of 5 sample images, then defeated by this 5
Brightness value T can find out practical gamma value by interpolation method out, and efficiency and measurement accuracy can be improved.
Step S40, when the current gamma value and the difference of default gamma value are greater than default error threshold, according to described
Difference calculates the offset of the current gamma curve of the display panel；
It will be appreciated that the gamma curve of TV can be designed at gamma 2.2 (i.e. gamma value is 2.2), it could effectively
Existing display system is compensated, allows human eye to obtain optimal display effect, therefore the default gamma value of the present embodiment is preferably gal
Horse value is 2.2.
Step 50, it is adjusted according to current gamma curve of the offset to the display panel.
Wherein, the step 50 specifically includes: the offset of gamma value is burned onto the storage chip of the display panel
In, it is adjusted with the current gamma curve to the display panel.
Specifically, the offset of gamma value is burned onto the storage chip of the display panel by the step, to institute
The current gamma curve for stating display panel, which is adjusted, further comprises:
It is updated, is obtained according to original display look-up table LUT of the offset of the gamma value to the display panel
New display look-up table LUT；
It in the concrete realization, can be by the original display look-up table LUT of the display panel after the offset for obtaining gamma value
Data corresponding with the offset of the gamma value are quantified as, i.e., according to the offset of the gamma value to the display panel
Original display look-up table LUT is updated, and obtains new display look-up table LUT；
The new display look-up table LUT is burned onto the storage chip of the display panel, not only it is adjustable simultaneously
The current gamma curve for correcting the display panel may also correct for the white balance of panel.It should be noted that the present embodiment
The storage chip of display panel is EEPROM (Electrically Erasable Programmable read only
Memory, Electrically Erasable Programmable Read-Only Memory).
It will be appreciated that will do it gamma Compensation Analysis if gamma curve is deviated, by the gamma curve school of panel
Just to normal range (NR) (usually 2.2 ± 0.2 gamma), the offset of current gamma curve is finally burned onto panel again
EEPROM, and the step of re-executing measurement verifying current gamma curve.
The present embodiment when the public electrode voltages of display panel are predeterminated voltage, carry out image to display panel and adopts first
Sample, to obtain the sample image of different color channels；Then the output brightness value of each sample image is measured respectively；Further according to various kinds
The output brightness value of this image calculates the current gamma value of display panel；Finally in the difference of current gamma value and default gamma value
When greater than default error threshold, the offset of the current gamma curve of display panel is calculated according to difference, and according to offset pair
The current gamma curve of display panel is adjusted, and the present embodiment can not need to search the algorithm of best gamma electric voltage, is not necessarily to
Gamma chip is detected, actual gamma curve value can be measured, and then shorten in faceplate manufacturing process to gal
The adjustment time of horse curve, and it is more accurate to the adjustment result of the gamma curve of panel, greatly improve the life of display panel
Produce efficiency.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of gamma curve method for adjusting display panel, which is characterized in that the described method includes:
When the public electrode voltages of display panel are predeterminated voltage, image sampling is carried out to the display panel, to obtain not
With the sample image of Color Channel；
The output brightness value of each sample image is measured respectively；
The current gamma value that the display panel is calculated according to the output brightness value of each sample image, according to the current gamma value
Determine the current gamma curve of the display panel；
When the current gamma value and the difference of default gamma value are greater than default error threshold, according to difference calculating
The offset of the current gamma curve of display panel；
It is adjusted according to current gamma curve of the offset to the display panel.
2. the method as described in claim 1, which is characterized in that the public electrode voltages in display panel are predeterminated voltage
When, to display panel progress image sampling, before the sample image to obtain different color channels, the method is also wrapped
It includes:
In response to the voltage adjustment instruction of user's input, according to the voltage adjustment instruction by the public electrode of the display panel
Voltage is adjusted to being 255 with grayscale value or grayscale value is 128 corresponding voltages.
3. the method according to claim 1, which is characterized in that the output brightness value according to each sample image
The current gamma value for calculating the display panel, specifically includes:
The output brightness value interpolation of each sample image is entered in gamma mathematical model, to calculate the current gal of the display panel
Horse value；The gamma mathematical model formula T=LGammaIt indicates, wherein Gamma indicates that gamma value, T indicate that the output of panel is bright
Angle value, L indicate the input grayscale value of panel.
4. the method as described in claim 1, which is characterized in that it is described according to the offset to the current of the display panel
Gamma curve is adjusted, and is specifically included:
The offset of gamma value is burned onto the storage chip of the display panel, with the current gamma to the display panel
Curve is adjusted.
5. method as claimed in claim 4, which is characterized in that described that the offset of gamma value is burned onto the display panel
Storage chip in, be adjusted, specifically included with the current gamma curve to the display panel:
It is updated according to original display look-up table of the offset of the gamma value to the display panel, obtains new display
Look-up table；
The new display look-up table is burned onto the storage chip of the display panel, to the current of the display panel
Gamma curve is adjusted.
6. a kind of gamma curve device for adjusting display panel, which is characterized in that described device includes:
Sampling module, for the public electrode voltages in display panel be predeterminated voltage when, to the display panel carry out image
Sampling, to obtain the sample image of different color channels；
Photoelectric conversion module, for measuring the output brightness value of each sample image respectively；
Curve computing module calculates the current gamma value of the display panel for the output brightness value according to each sample image；
Compensating module, when for the difference in the current gamma value and default gamma value greater than default error threshold, according to institute
State the offset that difference calculates the current gamma curve of the display panel；
Module is adjusted, for being adjusted according to current gamma curve of the offset to the display panel.
7. device as claimed in claim 6, which is characterized in that described device further include:
Voltage regulator module, the voltage adjustment instruction for inputting in response to user will be described according to the voltage adjustment instruction
The public electrode voltages of display panel are adjusted to being 255 with grayscale value or grayscale value is 128 corresponding voltages.
8. such as the described in any item devices of claim 6-7, which is characterized in that the curve computing module specifically includes:
Interpolation unit, for entering the input grayscale value interpolation of each white brightness sample image in gamma mathematical model, to calculate
The current gamma value of the display panel out；The gamma mathematical model formula T=LGammaIt indicates, wherein Gamma indicates gal
Horse value, T indicate that the output brightness value of panel, L indicate the input grayscale value of panel.
9. device as claimed in claim 6, which is characterized in that the adjustment module specifically includes:
Burning unit, for the offset of gamma value to be burned onto the storage chip of the display panel, to the display
The current gamma curve of panel is adjusted.
10. device as claimed in claim 9, which is characterized in that the burning unit specifically includes:
Subelement is updated, for carrying out more according to the offset of the gamma value to the original display look-up table of the display panel
Newly, new display look-up table is obtained；
Burning subelement, for the new display look-up table to be burned onto the storage chip of the display panel, to institute
The current gamma curve for stating display panel is adjusted.
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| CN201811238631.1A CN109036326B (en) | 2018-10-23 | 2018-10-23 | Method and device for adjusting gamma curve of display panel |
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