CN106548756A - A kind of GTG shows compensation method and system, display device - Google Patents
A kind of GTG shows compensation method and system, display device Download PDFInfo
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- CN106548756A CN106548756A CN201610944023.7A CN201610944023A CN106548756A CN 106548756 A CN106548756 A CN 106548756A CN 201610944023 A CN201610944023 A CN 201610944023A CN 106548756 A CN106548756 A CN 106548756A
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- driving voltage
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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
- 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
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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 invention provides a kind of GTG shows compensation method and system, display device, the method is comprised the following steps：The deviation value between the expected driving voltage of the actual driving voltage and the GTG of each GTG corresponding in white balance look-up table is calculated, to set up deviation value table；Using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as the actual driving voltage of target gray scale, and the deviation value from deviation value table corresponding to the actual driving voltage of lookup target gray scale；Deviation value amendment according to corresponding to the actual driving voltage of the target gray scale actual driving voltage, and the GTG corresponding to revised actual driving voltage is found in white balance look-up table, replace GTG to be shown to be shown using the GTG as target gray scale.The present invention under the driving chip of lower accuracy can still can ensure that the optical effect of LCD, and then can reduce the required precision of driving chip.
Description
Technical field
The invention belongs to display control technology field, specifically, more particularly to a kind of GTG shows compensation method and is
System, display device.
Background technology
Due to quality requirements more and more higher now to liquid crystal display LCD, while advising to the parameter of LCD inner components
Lattice require also more and more stricter.In being illustrated in figure 1 prior art, one kind ties up point voltage offer circuit PCBA and source drive core
The connection diagram of piece SOURCEDRIVER.As shown in figure 1, PCBA is used for offer 14 ties up point voltage；SOURCEDRIVER is sharp
Each gray scale voltage is produced with its built-in divider resistance string, then corresponding gray scale voltage Jing analog-digital converter DAC are converted to
Digital signal, most after Jing output buffer unit OUTPUTBUFFER outputs.
In source driving chip the precision of divider resistance and tie up point voltage provide circuit provide the output for tying up point voltage
Value directly influences driving voltage during each GTG actual displayed, so as to affect the optical appearance of TFT-LCD.So, in reality
In the production of border, source driving chip requires higher precision, but higher precision means relatively low yield and higher
Price.
Point voltage is tied up in general LCD design of drive circuit the voltage that circuit provides each GTG, source drive core are provided
Piece completes the electric resistance partial pressure allotment effect of each gray scale voltage signal.When source driving chip precision is inadequate, gamma can be caused
Voltage (Gamma) occurs to deviate, and then affects the display effect of LCD.
The content of the invention
To solve problem above, the invention provides a kind of GTG shows compensation method and system, display device, to
Under the driving chip of lower accuracy, the optical effect of LCD is still can ensure that, and then the precision of driving chip can be reduced and wanted
Ask.
According to an aspect of the invention, there is provided a kind of GTG shows compensation method, comprise the following steps：
Calculate the actual driving voltage of each GTG expected driving electricity corresponding in white balance look-up table with the GTG
Deviation value between pressure, to set up deviation value table；
Using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as the actual drive of target gray scale
Galvanic electricity pressure, and the deviation value corresponding to the actual driving voltage of the target gray scale is searched from the deviation value table；
Deviation value amendment according to corresponding to the actual driving voltage of the target gray scale actual driving voltage, and white
The GTG corresponding to revised actual driving voltage is found in balance look-up table, replaces treating using the GTG as target gray scale
Show that GTG is shown.
According to one embodiment of present invention, the deviation value according to corresponding to the actual driving voltage of the target gray scale is repaiied
The just actual driving voltage, and the GTG corresponding to revised actual driving voltage is found in white balance look-up table, with this
GTG replaces GTG to be shown to carry out showing further comprising the steps as target gray scale：
By the actual driving voltage of the target gray scale and the corresponding deviation value summation of the actual driving voltage, to be asked
And voltage；
The GTG corresponding to the sum voltages is searched in white balance look-up table, and with corresponding to the sum voltages
GTG is used as target gray scale.
According to one embodiment of present invention, set up deviation value table further comprising the steps：
Obtain point voltage is tied up to what driving chip was provided；
According to it is described tie up point voltage and resistance string inside driving chip obtain each GTG corresponding to actual driving
Voltage；
Ask for the expected drive that the actual driving voltage corresponding to each GTG is mapped in white balance look-up table with the GTG
Deviation value between galvanic electricity pressure, and set up deviation value table.
According to one embodiment of present invention, after the deviation value table is set up, store the deviation value table.
According to another aspect of the present invention, additionally provide a kind of GTG and show compensation system, including：
Deviation value table acquisition module, calculates actual driving voltage and GTG institute in white balance look-up table of each GTG
Deviation value between corresponding expected driving voltage, to set up deviation value table；
Deviation value searching modul, using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as mesh
The actual driving voltage of mark GTG, and search from the deviation value table corresponding to the actual driving voltage of the target gray scale
Deviation value；
Gray scale compensation module, the deviation value amendment according to corresponding to the actual driving voltage of the target gray scale this it is actual drive
Galvanic electricity pressure, and the GTG corresponding to revised actual driving voltage is found in white balance look-up table, using the GTG as mesh
Mark GTG to replace GTG to be shown to be shown.
According to one embodiment of present invention, the gray scale compensation module finds target gray scale in the following manner：
By the actual driving voltage of the target gray scale and the corresponding deviation value summation of the actual driving voltage, to be asked
And voltage；
The GTG corresponding to the sum voltages is searched in white balance look-up table, and with corresponding to the sum voltages
GTG is used as target gray scale.
According to one embodiment of present invention, the deviation value table acquisition module sets up deviation value table in the following manner：
Obtain point voltage is tied up to what driving chip was provided；
According to it is described tie up point voltage and resistance string inside driving chip obtain each GTG corresponding to actual driving
Voltage；
Ask for the expected drive that the actual driving voltage corresponding to each GTG is mapped in white balance look-up table with the GTG
Deviation value between galvanic electricity pressure, and set up deviation value table.
According to one embodiment of present invention, the system also includes memorizer, to store the deviation value table.
According to one embodiment of present invention, the system is arranged in the sequencing contro plate of display device.
According to a further aspect of the invention, additionally provide a kind of display device of employing system above.
Beneficial effects of the present invention：
The present invention is by showing that GTG is compensated, under the driving chip of lower accuracy, still can ensure that LCD's
Optical effect, and then the required precision of driving chip can be reduced.
Other features and advantages of the present invention will be illustrated in the following description, also, partly be become from description
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by description, rights
In claim and accompanying drawing, specifically noted structure is realizing and obtain.
Description of the drawings
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, embodiment will be described below needed for want
Accompanying drawing does simple introduction：
Fig. 1 is a kind of connection diagram for tying up point voltage offer circuit and source driving chip in prior art；
Fig. 2 a are a kind of GTG-brightness relationship schematic diagrams；
Fig. 2 b are a kind of gray scale voltage-driving voltage relation schematic diagrams；
Fig. 3 is voltage according to an embodiment of the invention-gray scale compensation schematic diagram；
Fig. 4 is method flow diagram according to an embodiment of the invention.
Specific embodiment
Describe embodiments of the present invention below with reference to drawings and Examples in detail, whereby how the present invention is applied
Technological means solving technical problem, and reach technique effect realize that process can fully understand and implement according to this.Need explanation
As long as not constituting conflict, each embodiment and each feature in each embodiment in the present invention can be combined with each other,
The technical scheme for being formed is within protection scope of the present invention.
Experiment shows that each in such as Fig. 1 ties up the generation deviation such as point GMA1/GMA2/GMA8/GMA9/GMA13/GMA14,
Influence whether that the Gamma values of display device deviate fixed value 2.2 (the Gamma values of generally general LCD are set as fixed value 2.2).
So that GMA1 and GMA14 represents 255 GTG positive-negative polarity voltages respectively as an example, each gray scale voltage is subject to input to tie up point voltage to offer
The impact of reference voltage V REF of circuit.In addition, when the precision of source driving chip is inadequate, respectively tying up point voltage also can be to difference
Deviate in direction.
As the voltage deviation for tying up point GMA1-GMA14 is according to the intrinsic result of practical situation, it means that 255 GTGs
Brightness cannot be adjusted.Because 255 GTGs are high-high brightness, by the computing formula of gamma value γ：
γ=log (Lv (G)/Lv (255))/log (G/255) (1)
As can be seen that the corresponding gamma value of each GTG, depends on the relation of its gray-scale intensity and 255 gray-scale intensities.Its
In, G represents gray-scale intensity.
When the required precision for reducing driving chip, it is assumed that it is negative to be upwardly deviated from just, to be deflected downwardly, then each ties up electric
Pressure hypothesis there occurs deviation △ V (1), △ V (2) ... △ V (11), △ V (12), △ V (13), △ V (14).For example for 255 is grey
For rank, its both end voltage change turns to V1+ △ V (1) and V (14)+△ V (14).
Actual experiment shows, if all of deviation value △ V deviate to same direction, i.e., simultaneously bigger than normal or while when less than normal,
Gamma value institute is impacted very slight.But when each ties up deviation value △ V a little there are positive and negative different situations, gamma will be by tighter
Ghost image rings.For 255 GTGs, it is considered to which which is the result of △ V (1)-△ V (14), such as when △ V (1) are to be upwardly deviated from, △ V
(14), when to be deflected downwardly, actual difference is the sum of △ V (1) and △ V (14) absolute value.The then deviation value of 255 gray scale voltages
For：
Voffset255=(△ V (1)-△ V (14))/2 (2)
Similarly, the deviation value for respectively tying up the gray scale voltage output valve of point voltage corresponding position is：
Its correspond to respectively 0,1,31,127,223,254 tie up at voltage deviation amount.Specifically tying up a little can be according to driving
Chip is arranged.
From Fig. 2 a, the characteristic relation of LCD GTGs-brightness itself may rely on the initial representative value for setting and obtain
Arrive.According to the relation curve of the driving voltage and GTG of Fig. 2 b, be not difficult to draw for Voffset254, Voffset223,
Voffset127 ... Voffset0 its corresponding gray scale compensation relation.With a kind of more extreme deviation situation citing, such as Fig. 3 institutes
Show, as the change of actual driving voltage causes the pressure reduction of A points correspondence GTG to reduce, so as to generate deviation value so that at this
The actual voltage for having corresponded to lower GTG of GTG.So in order to compensate this change in voltage, then its corresponding actual gray needs
Draw high, that is, need higher GTG to correspond to expected pressure reduction.
For problem above, the invention provides a kind of GTG shows compensation method, it is illustrated in figure 4 of the invention
The method flow diagram of one embodiment, below with reference to Fig. 4, the present invention is described in detail.
It is step S110 first, the institute in white balance look-up table is right with the GTG for the actual driving voltage of each GTG of calculating
Deviation value between the expected driving voltage answered, to set up deviation value table.Wherein, the actual driving voltage of each GTG by
What driving chip was provided ties up point voltage and the acquisition of the resistance string inside driving chip.Specifically, tie up a little as shown in figure 1, obtaining
GMA1-GMA14 output voltage, that is, tie up point voltage provide circuit PCBA to driving chip SOURCEDRIVER provide it is each
Tie up point voltage；Then, the configuration relation according to driving chip internal resistance string, it is possible to obtain the corresponding reality of GTG V255-V0
Driving voltage.Tie up point GMA1-GMA14 output voltage be normal value when, corresponding actual driving voltages of GTG V255-V0 etc.
The expected driving voltage stored in white balance look-up table.Otherwise, actual driving voltage has deviation with expected driving voltage, this
When, the expected driving voltage that can be stored in passing through actual driving voltage and white balance look-up table asks for both deviation values, by
This deviation value for obtaining is positive or negative.The actual driving voltage of all GTGs and the deviation value of expected driving voltage are stored, and is built
Vertical deviation value table is with easy-to-look-up.
Followed by step S120, using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as
The actual driving voltage of target gray scale, and the deviation from deviation value table corresponding to the actual driving voltage of lookup target gray scale
Value.For example, as shown in figure 3, curve 1 and 2 is ideal gamma curve, curve 1 ' and 2 ' is actual gamma curve.Due to be shown
The actual driving voltage of GTG (such as A points correspondence GTG V220) there occurs that (the actual driving voltage of GTG is no longer reason for change
The 13v for thinking, but become 12v), cause the actual GTG for having corresponded to lower GTG in white balance look-up table of the GTG to be shown
Voltage (B points correspondence GTG).To compensate this change in voltage, need A points actual driving voltage corresponding GTG to be drawn high to C points
The corresponding GTG of actual driving voltage, the numerical value of the corresponding gray scale voltage of A, C point are identical.If the actual driving voltage of C points is corresponding
GTG is target gray scale, and the actual driving voltage of C points is the actual driving voltage on actual gamma curve 1 ', can by deviation value table
To find the corresponding deviation value of the actual driving voltage of C points, it is assumed that for 0.5v.It should be noted herein that C points are actual to drive electricity
Press and look into correspondence white balance different from the actual driving voltage of A points with the deviation value of expected driving voltage in corresponding white balance look-up table
Look for the deviation value of expected driving voltage in table.
Finally step S130, the deviation value amendment according to corresponding to the actual driving voltage of target gray scale this it is actual drive
Voltage, and the GTG corresponding to revised actual driving voltage is found in white balance look-up table, using the GTG as target
GTG is shown replacing GTG to be shown.Specifically, the actual driving voltage and corresponding deviation value of target gray scale are asked
With, to obtain sum voltages, the actual driving voltage of C points will sue for peace with corresponding deviation value in Fig. 3, the voltage of the sum voltages
Numerical value is equal to the driving voltage numerical value of D points.The driving voltage correspondence expected driving voltage of the C points in white balance look-up table of D points
13.5v, the expection driving voltage are sum voltages.Then, the ash in white balance look-up table corresponding to lookup sum voltages
Rank, and using the corresponding GTG of sum voltages as target gray scale, i.e., D points are found in white balance look-up table and is expected driving voltage pair
The GTG (D points GTG is V239) answered, the corresponding GTG of D points is target gray scale.During final display, just by D points corresponding ash
Rank V239 replaces the corresponding GTG V220 of A points.The pressure reduction of the corresponding actual driving voltage of the target gray scale is equal to GTG to be shown
Pressure reduction in white balance look-up table.
So, by compensating to GTG to be shown, under the driving chip of lower accuracy, still can ensure that LCD
Optical effect, and then the required precision of driving chip can be reduced.
According to another aspect of the present invention, additionally provide a kind of GTG and show compensation system, the system includes deviation value
Table acquisition module, deviation value searching modul and gray scale compensation module.Wherein, deviation value table acquisition module calculates the reality of each GTG
Deviation value between the corresponding expected driving voltage in white balance look-up table of border driving voltage and the GTG, to set up deviation
Value table；Deviation value searching modul is using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as target ash
The actual driving voltage of rank, and the deviation value from deviation value table corresponding to the actual driving voltage of lookup target gray scale；GTG
Deviation value amendment of the compensating module according to corresponding to the actual driving voltage of the target gray scale actual driving voltage, and in white balance
The GTG corresponding to revised actual driving voltage is found in look-up table, it is to be shown to replace as target gray scale using the GTG
GTG is shown.
According to one embodiment of present invention, the gray scale compensation module finds target gray scale in the following manner：By target
The actual driving voltage of GTG and the corresponding deviation value summation of the actual driving voltage, to obtain sum voltages；Look in white balance
The GTG corresponding to lookup sum voltages in table is looked for, and using the GTG corresponding to sum voltages as target gray scale.
According to one embodiment of present invention, the deviation value table acquisition module sets up deviation value table in the following manner：Obtain
What orientation driving chip was provided ties up point voltage；Resistance string according to point voltage is tied up and inside driving chip obtains each GTG institute
Corresponding actual driving voltage；Ask for the actual driving voltage corresponding to each GTG to reflect in white balance look-up table with the GTG
Deviation value between the expected driving voltage penetrated, and set up deviation value table.
According to one embodiment of present invention, the system also include memorizer, its respectively with deviation value acquisition module and ash
Rank compensating module connects, to store deviation value table.
According to one embodiment of present invention, the system is arranged in the sequencing contro plate of display device, will the system
It is arranged in the sequencing contro plate TCON plates of display device.Certainly, the system can also be arranged at display dress as absolute construction
In putting.
According to a further aspect of the invention, additionally provide a kind of display device of employing system above.The display
Device still can ensure that the optics effect of LCD by compensating to GTG to be shown under the driving chip of lower accuracy
Really, and then the required precision of driving chip can be reduced.
While it is disclosed that embodiment as above, but described content only to facilitate understand the present invention and adopt
Embodiment, is not limited to the present invention.Technical staff in any the technical field of the invention, without departing from this
On the premise of the disclosed spirit and scope of invention, any modification and change can be made in the formal and details implemented,
But the scope of patent protection of the present invention, still must be defined by the scope of which is defined in the appended claims.
Claims (10)
1. a kind of GTG shows compensation method, comprises the following steps：
Calculate the actual driving voltage of each GTG expected driving voltage corresponding in white balance look-up table with the GTG it
Between deviation value, set up deviation value table；
Using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as the actual driving electricity of target gray scale
Pressure, searches the deviation value corresponding to the actual driving voltage of the target gray scale from the deviation value table；
Deviation value amendment according to corresponding to the actual driving voltage of the target gray scale actual driving voltage, and in white balance
The GTG corresponding to revised actual driving voltage is found in look-up table, it is to be shown to replace as target gray scale using the GTG
GTG is shown.
2. method according to claim 1, it is characterised in that according to corresponding to the actual driving voltage of the target gray scale
The deviation value amendment actual driving voltage, and find in white balance look-up table corresponding to revised actual driving voltage
GTG, replaces GTG to be shown to carry out showing further comprising the steps using the GTG as target gray scale：
By the actual driving voltage of the target gray scale and the corresponding deviation value summation of the actual driving voltage, to obtain summation electricity
Pressure；
The GTG corresponding to the sum voltages is searched in white balance look-up table, and with the GTG corresponding to the sum voltages
As target gray scale.
3. method according to claim 1 and 2, it is characterised in that set up deviation value table further comprising the steps：
Obtain point voltage is tied up to what driving chip was provided；
According to it is described tie up point voltage and resistance string inside driving chip obtain each GTG corresponding to actual driving voltage；
Ask for the expected driving electricity that the actual driving voltage corresponding to each GTG is mapped in white balance look-up table with the GTG
Deviation value between pressure, and set up deviation value table.
4. method according to claim 3, it is characterised in that after the deviation value table is set up, stores the deviation
Value table.
5. a kind of GTG shows compensation system, including：
Deviation value table acquisition module, the actual driving voltage for calculating each GTG are corresponding in white balance look-up table with the GTG
Expected driving voltage between deviation value, set up deviation value table；
Deviation value searching modul, using the corresponding expected driving voltage in white balance look-up table of GTG to be shown as target ash
The actual driving voltage of rank, searches the deviation corresponding to the actual driving voltage of the target gray scale from the deviation value table
Value；
Gray scale compensation module, the actual driving of the deviation value amendment according to corresponding to the actual driving voltage of the target gray scale are electric
Pressure, and the GTG corresponding to revised actual driving voltage is found in white balance look-up table, using the GTG as target ash
Rank is shown replacing GTG to be shown.
6. system according to claim 5, it is characterised in that the gray scale compensation module finds target in the following manner
GTG：
By the actual driving voltage of the target gray scale and the corresponding deviation value summation of the actual driving voltage, to obtain summation electricity
Pressure；
The GTG corresponding to the sum voltages is searched in white balance look-up table, and with the GTG corresponding to the sum voltages
As target gray scale.
7. the system according to claim 5 or 6, it is characterised in that the deviation value table acquisition module is in the following manner
Set up deviation value table：
Obtain point voltage is tied up to what driving chip was provided；
According to it is described tie up point voltage and resistance string inside driving chip obtain each GTG corresponding to actual driving voltage；
Ask for the expected driving electricity that the actual driving voltage corresponding to each GTG is mapped in white balance look-up table with the GTG
Deviation value between pressure, and set up deviation value table.
8. system according to claim 7, it is characterised in that the system also includes memorizer, to store it is described partially
From value table.
9. system according to claim 5, it is characterised in that the system is arranged at the sequencing contro plate of display device
In.
10. the display device of system any one of a kind of employing claim 5-9.
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| CN109427300B (en) * | 2017-08-23 | 2021-08-24 | 乐金显示有限公司 | Brightness compensation system and brightness compensation method thereof |
| CN107845365A (en) * | 2017-11-22 | 2018-03-27 | 深圳市华星光电半导体显示技术有限公司 | The compensation system of displayer and compensation method |
| CN109712585A (en) * | 2019-02-14 | 2019-05-03 | 惠州市华星光电技术有限公司 | Display device method of adjustment |
| CN109712585B (en) * | 2019-02-14 | 2021-01-01 | 惠州市华星光电技术有限公司 | Display device adjusting method |
| CN110570804A (en) * | 2019-09-12 | 2019-12-13 | 云谷（固安）科技有限公司 | driving device and driving method of display panel and display device |
| CN112735347A (en) * | 2020-12-30 | 2021-04-30 | Tcl华星光电技术有限公司 | Overvoltage compensation method and device, display panel and storage medium |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |