CN109377949A - TFT-LCD panel secondary overvoltage compensation method and device - Google Patents
TFT-LCD panel secondary overvoltage compensation method and device Download PDFInfo
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- CN109377949A CN109377949A CN201811231811.7A CN201811231811A CN109377949A CN 109377949 A CN109377949 A CN 109377949A CN 201811231811 A CN201811231811 A CN 201811231811A CN 109377949 A CN109377949 A CN 109377949A
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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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Abstract
The present invention relates to a kind of TFT-LCD panel secondary overvoltage compensation method and devices.This method comprises: step 10, the first over-voltage compensating module obtain current goal luma data, the previous actual gray data from buffer module are obtained, obtain current over-voltage offset, source electrode line charges to pixel according to the current over-voltage offset output gray scale voltage；Step 20, the second over-voltage compensating module obtain current goal luma data, obtain the previous actual gray data from buffer module, obtain currently practical luma data, export the current actual gray data to buffer module；Step 30, buffer module store the current actual gray data, previous actual gray data that output is stored to the first and second over-voltages compensating module.The present invention also provides compensation devices.The present invention can improve the situation that compensation inaccuracy caused by over-voltage compensation is done without extra voltage by secondary overvoltage compensation, keep over-voltage compensation more accurate, so as to improve colour cast.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of TFT-LCD panel secondary overvoltage compensation method and devices.
Background technique
TFT (Thin Film Transistor) LCD, that is, thin film transistor LCD, is active matrix type liquid crystal
One of display (AM-LCD).Current panel market tends to be saturated, and the market price constantly reduces, and in order to seek profit, changes
It is imperative that kind innovation reduces cost.In order to reduce the number of source electrode (Source) driving chip (IC), cost, Ren Menti are reduced
Three grid of panel (tri gate) framework is gone out, i.e. grid (gate) number of scanning lines quantitative change is original 3 times, and RGB sub-pixel is perpendicular
To arrangement, source driving chip quantity becomes original 1/3, substantially reduces cost.But this framework the disadvantage is that panel source electrode
It drives cabling elongated, leads to capacitance resistance load (RC Loading) seriously, charging is difficult, and final undercharge makes panel color occur
Partially, panel quality is influenced, in the case that especially current large scale, high-res panel are prevailing, colour cast is even more serious.To improve
Three grid panel image quality, it is necessary to improve colour cast.
(OD) technology is compensated using over-voltage to improve charging ability, so as to improve colour cast in the prior art.As shown in Figure 1,
It is using over-voltage compensation technique and using the charging ability comparison schematic diagram of over-voltage compensation technique.In Fig. 1, the longitudinal axis indicates ash
Rank, horizontal axis indicate the time, and controlling grid scan line L (n-1), L (n) and L (n+1) corresponding to same source line etc. are suitable according to timing
Sequence unlatches and closes, and when controlling grid scan line is opened, exports corresponding grayscale, that is, gray scale voltage by corresponding source electrode line, also
It is to be charged with corresponding gray scale voltage to pixel；What the broken line of source grayscale indicated to input by source electrode line in Fig. 1 is used for charging
The variation tendency of gray scale voltage, curve indicate the actual charging effect of pixel.Left side, which is shown, in Fig. 1 does not use over-voltage compensation technique
Charging effect, for pixel is charged to target gray scale, the grayscale of source electrode line output is consistent with target gray scale, as a result finally obtains
Curve deviate from target gray scale；Right side shows the charging effect for using over-voltage compensation technique in Fig. 1, in over-voltage compensation technique
In, it can determine what source electrode line needed to export using over-voltage compensation look-up table according to the initial grayscale in target gray scale and source electrode line
Over-voltage offset, source electrode line charge to pixel according to over-voltage offset output grayscale, and finally obtained block curve more connects
It is bordering on target gray scale, as a comparison, right side shows the charging effect for not using over-voltage compensation technique also in Fig. 1 with dashed curve.
It as shown in Figure 2 A and 2 B, is not foot point schematic diagram present in existing over-voltage compensation technique.
As shown in Figure 2 A, when 1 frame time input data is R_G_B=30_255_127, i.e. target gray scale sequence becomes
It is 30,255 and 127,30 gray scale voltages are jumped first to 255 gray scale voltages on source electrode line, and existing over-voltage compensation technique is in 255 ashes
Rank does not have excess voltage to compensate, and the optimal brightness of 255 grayscale cannot be reached when 30 grayscale being caused to jump to 255 grayscale, may
The brightness of 240 grayscale is only reached, when and then 255 grayscale are jumped to 127 grayscale, when jumping due to 30 grayscale to 255 grayscale only
The brightness of 240 grayscale can be reached, incorrect over-voltage offset can be obtained when being jumped at this time with 255 grayscale to 127 grayscale.
As shown in Figure 2 B, when 1 frame time input data be input R_G_B=127_0_200 when, i.e., target gray scale sequence
Become 127,0 and 200,127 gray scale voltages are jumped first to 0 gray scale voltage on source electrode line, and existing over-voltage compensation technique is in 0 grayscale
There is no excess voltage to compensate, the optimal brightness of 0 grayscale cannot be reached when 127 grayscale being caused to jump to 0 grayscale, may only reach
The brightness of 10 grayscale, when and then 0 grayscale is jumped to 200 grayscale, due to can only achieve 10 ashes when 127 grayscale are jumped to 0 grayscale
The brightness of rank, incorrect over-voltage offset can be obtained at this time by being jumped with 0 grayscale to 200 grayscale.
When target gray scale is close near 255 grayscale or close near 0 grayscale, although there is excess voltage to do over-voltage benefit
It repays, but target gray scale is arrived in extra voltage or inadequate compensation, at this moment also will appear problem shown in Fig. 2A and Fig. 2 B.Existing mistake
The defect of pressure compensation technique is, when encountering previous target gray scale does not have extra voltage to do over-voltage compensation, followed by
The over-voltage offset of target gray scale to will lead to voltage compensation incorrect, cause colour cast compensation bad.
Summary of the invention
Therefore, the purpose of the present invention is to provide a kind of TFT-LCD panel secondary overvoltage compensation method and devices, before solution
When one target gray scale does not have extra voltage to do over-voltage compensation, followed by the over-voltage offset of target gray scale lead to voltage
Compensate incorrect problem.
To achieve the above object, the present invention provides a kind of TFT-LCD panel secondary overvoltage compensation methodes, comprising:
Step 10, the first over-voltage compensating module obtain current goal luma data, obtain the previous reality from buffer module
Border luma data obtains current over-voltage offset by over-voltage compensation technique, and source electrode line is exported according to the current over-voltage offset
Gray scale voltage charges to pixel；
Step 20, the second over-voltage compensating module obtain current goal luma data, obtain the previous reality from buffer module
Border luma data obtains currently practical luma data by over-voltage compensation technique, exports the current actual gray data to buffering
Module；
Step 30, buffer module store the current actual gray data, export the previous actual gray data stored
To the first over-voltage compensating module and the second over-voltage compensating module.
Wherein, step 30 further includes after the buffer module exports the previous actual gray data, deleting in the buffer module
Except the previous actual gray data.
Wherein, the primary data for the previous actual gray data which is stored is 0.
Wherein, in step 10, the first over-voltage compensating module is according to the current target gray scale data and previous actual gray
Data determine the current over-voltage offset from over-voltage compensation look-up table.
Wherein, in step 20, the second over-voltage compensating module is according to the current target gray scale data and previous actual gray
Data determine the current actual gray data from over-voltage compensation look-up table.
The present invention also provides a kind of TFT-LCD panel secondary overvoltage compensation devices, comprising:
First over-voltage compensating module obtains the previous reality from buffer module for obtaining current goal luma data
Luma data obtains the current over-voltage offset by over-voltage compensation technique, and source electrode line is exported according to the current over-voltage offset
Gray scale voltage charges to pixel；
Second over-voltage compensating module obtains the previous reality from buffer module for obtaining current goal luma data
Luma data obtains currently practical luma data by over-voltage compensation technique, exports the current actual gray data to buffering mould
Block；
Buffer module exports the previous actual gray data stored extremely for storing the current actual gray data
The first over-voltage compensating module and the second over-voltage compensating module.
Wherein, after which exports the previous actual gray data, the previous reality is deleted in the buffer module
Luma data.
Wherein, the primary data for the previous actual gray data which is stored is 0.
Wherein, the first over-voltage compensating module is according to the current target gray scale data and previous actual gray data, from mistake
The current over-voltage offset is determined in pressure compensation look-up table.
Wherein, the second over-voltage compensating module is according to the current target gray scale data and previous actual gray data, from mistake
The current actual gray data are determined in pressure compensation look-up table.
To sum up, TFT-LCD panel secondary overvoltage compensation method of the invention and device can be improved by secondary overvoltage compensation
No extra voltage does the situation of compensation inaccuracy caused by over-voltage compensation, keeps over-voltage compensation more accurate, so as to improve colour cast.
Detailed description of the invention
With reference to the accompanying drawing, by the way that detailed description of specific embodiments of the present invention, technical solution of the present invention will be made
And other beneficial effects are apparent.
In attached drawing,
Fig. 1 is not using over-voltage compensation technique and using the charging ability comparison schematic diagram of over-voltage compensation technique；
Fig. 2A and Fig. 2 B is not foot point schematic diagram present in existing over-voltage compensation technique；
Fig. 3 is the flow chart of TFT-LCD panel secondary overvoltage compensation method of the present invention；
Fig. 4 is the structural block diagram of one preferred embodiment of TFT-LCD panel secondary overvoltage compensation device of the present invention；
Fig. 5 A is the improvement schematic diagram of one preferred embodiment of TFT-LCD panel secondary overvoltage compensation method of the present invention；
Fig. 5 B is that the improvement of TFT-LCD panel secondary overvoltage compensation method another embodiment of the present invention is illustrated
Figure.
Specific embodiment
It is the flow chart of TFT-LCD panel secondary overvoltage compensation method of the present invention referring to Fig. 3, this method specifically includes that
Step 10, the first over-voltage compensating module obtain current goal luma data, obtain the previous reality from buffer module
Border luma data obtains current over-voltage offset by over-voltage compensation technique, and source electrode line is exported according to the current over-voltage offset
Gray scale voltage charges to pixel.
When three grid TFT-LCD panels are shown, the controlling grid scan line corresponding to same source line is according to temporal order
It unlatches and closes, when controlling grid scan line is opened, it is ash that source electrode chip, which exports corresponding luma data by corresponding source electrode line,
Rank voltage is charged with corresponding gray scale voltage to pixel to realize display.First over-voltage compensating module obtains current goal grayscale
The data grayscale namely currently to be shown, a timing is practical before also obtaining previous actual gray data i.e. current timing
The grayscale of display, so as to obtain current over-voltage offset by over-voltage compensation technique；Specifically, which compensates
Module can be according to the current target gray scale data and previous actual gray data, from predetermined over-voltage compensation look-up table
Determine the current over-voltage offset.After obtaining current over-voltage offset, source electrode chip can be by corresponding source electrode line according to institute
Obtained current over-voltage offset output gray scale voltage charges to pixel.
Step 20, the second over-voltage compensating module obtain current goal luma data, obtain the previous reality from buffer module
Border luma data obtains currently practical luma data by over-voltage compensation technique, exports the current actual gray data to buffering
Module.Second over-voltage compensating module obtains the current goal luma data grayscale namely currently to be shown, also obtains previous reality
The grayscale of a timing actual displayed before border luma data i.e. current timing, so as to be obtained by over-voltage compensation technique
Currently practical luma data namely obtains current goal luma data in the ash that can go out after over-voltage compensates with practical manifestation
Rank；Specifically, the second over-voltage compensating module can according to the current target gray scale data and previous actual gray data, from
The current actual gray data are determined in predetermined over-voltage compensation look-up table；And it can be further by the currently practical ash
Order is stored according to input buffer module by buffer module.
Step 30, buffer module store the current actual gray data, export the previous actual gray data stored
To the first over-voltage compensating module and the second over-voltage compensating module.Since panel is shown in a manner of scanning according to timing
Show, therefore buffer module is before storing currently practical luma data, a timing before current timing has usually been stored in advance
Previous actual gray data；In the case of initial, the previous actual gray data which can be stored
Primary data is set as 0.The previous actual gray data give the first over-voltage compensating module and the second mistake according to default sequential export
After pressing compensating module, the previous actual gray data can be deleted in the buffer module, can save memory space.
Based on preceding method, the present invention can also provide the TFT-LCD panel secondary overvoltage compensation dress for realizing preceding method
It sets, TFT-LCD panel secondary overvoltage compensation device of the invention can be understood based on preceding method.It referring to fig. 4, is this hair
The structural block diagram of bright one preferred embodiment of TFT-LCD panel secondary overvoltage compensation device, specifically includes that
First over-voltage compensating module 1 obtains the previous reality from buffer module 3 for obtaining current goal luma data
Border luma data obtains current over-voltage offset by over-voltage compensation technique, and source electrode line is exported according to the current over-voltage offset
Gray scale voltage charges to pixel；
Second over-voltage compensating module 2 obtains the previous reality from buffer module 3 for obtaining current goal luma data
Border luma data obtains currently practical luma data by over-voltage compensation technique, exports the current actual gray data to buffering
Module 3；
Buffer module 3 exports the previous actual gray data stored extremely for storing the current actual gray data
The first over-voltage compensating module 1 and the second over-voltage compensating module 2.
It is the improvement of one preferred embodiment of TFT-LCD panel secondary overvoltage compensation method of the present invention referring to Fig. 5 A
Schematic diagram, target gray scale is by taking R_G_B=30_255_127 as an example in Fig. 5 A, according to default timing variations.
When current goal grayscale is 30, initial previous actual gray data can be set to 0, compensate by the second over-voltage
It is 30 that currently practical luma data is obtained after resume module, and buffer module stores currently practical luma data 30；Previous reality at this time
Border luma data is 0, and current goal grayscale is 30, and correctly current over-voltage is exported after the processing of the first over-voltage compensating module and is mended
Repay value.
Then, current goal grayscale is 255 by 30 variations, and the previous actual gray data of buffer module output are 30, warp
Crossing after the second over-voltage compensating module is handled and obtaining currently practical luma data is 240, that is, can only achieve 240 brightness, is buffered
Module stores currently practical luma data 240, and previous actual gray data are 30 at this time, and current goal grayscale is 255, by the
Correctly current over-voltage offset is exported after the processing of one over-voltage compensating module.
Then, current goal grayscale is 127 by 255 variations, and the previous actual gray data of buffer module output are 240,
It is 127 that currently practical luma data is obtained after the processing of the second over-voltage compensating module, and buffer module stores currently practical grayscale
Data 127, previous actual gray data are 240 at this time, and current goal grayscale is 127, are handled by the first over-voltage compensating module
The correct current over-voltage offset of output afterwards, so as to just reach target gray scale 127.
After obtaining current over-voltage offset, source electrode chip can be by corresponding source electrode line according to obtained current over-voltage
Offset exports gray scale voltage and charges to pixel.Can improve to do over-voltage without extra voltage and compensate by secondary overvoltage compensation causes
Compensation inaccuracy situation, make over-voltage compensation it is more accurate, so as to improve colour cast.
It is that the improvement of TFT-LCD panel secondary overvoltage compensation method another embodiment of the present invention is imitated referring to Fig. 5 B
Fruit schematic diagram, target gray scale is by taking R_G_B=127_0_200 as an example in Fig. 5 B, according to default timing variations.
When current goal grayscale is 127, initial previous actual gray data can be set to 0, mend by the second over-voltage
Repaying and obtaining currently practical luma data after resume module is 127, and buffer module stores currently practical luma data 127；Before at this time
One actual gray data are 0, and current goal grayscale is 127, are exported after the processing of the first over-voltage compensating module correctly current
Over-voltage offset.
Then, current goal grayscale is 0 by 127 variations, and the previous actual gray data of buffer module output are 127, warp
Crossing after the second over-voltage compensating module is handled and obtaining currently practical luma data is 10, that is, can only achieve 10 brightness, buffers mould
Block stores currently practical luma data 10, and previous actual gray data are 127 at this time, and current goal grayscale is 0, by the first mistake
Correctly current over-voltage offset is exported after pressing compensating module processing.
Then, current goal grayscale is 200 by 0 variation, and the previous actual gray data of buffer module output are 10, is passed through
It is 200 that currently practical luma data is obtained after the processing of second over-voltage compensating module, and buffer module stores currently practical luma data
200, previous actual gray data are 10 at this time, and current goal grayscale is 200, are exported after the processing of the first over-voltage compensating module
Correctly current over-voltage offset, so as to just reach target gray scale 200.
When target gray scale is to be referred to Fig. 5 A and Fig. 5 B close near 255 grayscale or close to when combination near 0 grayscale
Shown process is similarly handled.
To sum up, TFT-LCD panel secondary overvoltage compensation method of the invention and device can be improved by secondary overvoltage compensation
No extra voltage does the situation of compensation inaccuracy caused by over-voltage compensation, keeps over-voltage compensation more accurate, so as to improve colour cast.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the appended right of the present invention
It is required that protection scope.
Claims (10)
1. a kind of TFT-LCD panel secondary overvoltage compensation method characterized by comprising
Step 10, the first over-voltage compensating module obtain current goal luma data, obtain the previous practical ash from buffer module
Order evidence obtains current over-voltage offset by over-voltage compensation technique, and source electrode line exports grayscale according to the current over-voltage offset
Voltage charges to pixel；
Step 20, the second over-voltage compensating module obtain current goal luma data, obtain the previous practical ash from buffer module
Order evidence obtains currently practical luma data by over-voltage compensation technique, exports the current actual gray data to buffer module；
Step 30, buffer module store the current actual gray data, export the previous actual gray data stored and extremely should
First over-voltage compensating module and the second over-voltage compensating module.
2. TFT-LCD panel secondary overvoltage compensation method as described in claim 1, which is characterized in that step 30 further includes being somebody's turn to do
After buffer module exports the previous actual gray data, the previous actual gray data are deleted in the buffer module.
3. TFT-LCD panel secondary overvoltage compensation method as described in claim 1, which is characterized in that the buffer module is deposited
The primary data of the previous actual gray data of storage is 0.
4. TFT-LCD panel secondary overvoltage compensation method as described in claim 1, which is characterized in that in step 10, this first
For over-voltage compensating module according to the current target gray scale data and previous actual gray data, determining from over-voltage compensation look-up table should
Current over-voltage offset.
5. TFT-LCD panel secondary overvoltage compensation method as described in claim 1, which is characterized in that in step 20, this second
For over-voltage compensating module according to the current target gray scale data and previous actual gray data, determining from over-voltage compensation look-up table should
Currently practical luma data.
6. a kind of TFT-LCD panel secondary overvoltage compensation device characterized by comprising
First over-voltage compensating module obtains the previous actual gray from buffer module for obtaining current goal luma data
Data obtain current over-voltage offset by over-voltage compensation technique, and source electrode line is according to the current over-voltage offset output grayscale electricity
Pressure charges to pixel；
Second over-voltage compensating module obtains the previous actual gray from buffer module for obtaining current goal luma data
Data obtain currently practical luma data by over-voltage compensation technique, export the current actual gray data to buffer module；
Buffer module, for storing the current actual gray data, export the previous actual gray data that are stored to this
One over-voltage compensating module and the second over-voltage compensating module.
7. TFT-LCD panel secondary overvoltage compensation device as claimed in claim 6, which is characterized in that buffer module output
After the previous actual gray data, the previous actual gray data are deleted in the buffer module.
8. TFT-LCD panel secondary overvoltage compensation device as claimed in claim 6, which is characterized in that the buffer module is deposited
The primary data of the previous actual gray data of storage is 0.
9. TFT-LCD panel secondary overvoltage compensation device as claimed in claim 6, which is characterized in that first over-voltage compensation
Module determines the current over-voltage from over-voltage compensation look-up table according to the current target gray scale data and previous actual gray data
Offset.
10. TFT-LCD panel secondary overvoltage compensation device as claimed in claim 6, which is characterized in that second over-voltage compensation
Module determines that this is currently practical from over-voltage compensation look-up table according to the current target gray scale data and previous actual gray data
Luma data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811231811.7A CN109377949A (en) | 2018-10-22 | 2018-10-22 | TFT-LCD panel secondary overvoltage compensation method and device |
| PCT/CN2018/115979 WO2020082469A1 (en) | 2018-10-22 | 2018-11-16 | Tft-lcd panel secondary overvoltage compensation method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811231811.7A CN109377949A (en) | 2018-10-22 | 2018-10-22 | TFT-LCD panel secondary overvoltage compensation method and device |
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| CN109377949A true CN109377949A (en) | 2019-02-22 |
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| CN201811231811.7A Pending CN109377949A (en) | 2018-10-22 | 2018-10-22 | TFT-LCD panel secondary overvoltage compensation method and device |
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| WO (1) | WO2020082469A1 (en) |
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| WO2021000632A1 (en) * | 2019-07-02 | 2021-01-07 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display panel and method for improving dynamic picture tailing of liquid crystal display panel |
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| WO2020082469A1 (en) | 2020-04-30 |
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Application publication date: 20190222 |