CN105139817B - A kind of method and apparatus for preventing liquid crystal display panel ghost - Google Patents
A kind of method and apparatus for preventing liquid crystal display panel ghost Download PDFInfo
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- CN105139817B CN105139817B CN201510631245.9A CN201510631245A CN105139817B CN 105139817 B CN105139817 B CN 105139817B CN 201510631245 A CN201510631245 A CN 201510631245A CN 105139817 B CN105139817 B CN 105139817B
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- amendment
- voltage
- frame data
- ghost
- liquid crystal
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Abstract
The invention discloses a kind of method and apparatus for preventing liquid crystal display panel ghost, when not changing for a long time to solve the picture shown by TFT LCD, cause TFT LCD screen the problem of ghost phenomena occur.The method for preventing liquid crystal display panel ghost, including：Periodically obtain frame data；Whether identical compare presently described frame data and the previous frame data obtained of acquisition, if so, ghost amendment enable signal then is put into high level, if it is not, the ghost amendment enable signal then is set low into level；When the ghost amendment enable signal continuously keeps the duration of high level to exceed first threshold, the amendment voltage offset downward according to the generation of original common electric voltage, it is supplied to the liquid crystal display panel to revert to the original common electric voltage again as current common electric voltage and after keeping an amendment duration amendment voltage.
Description
Technical field
The present invention relates to field of liquid crystal display, more particularly to a kind of method and apparatus for preventing liquid crystal display panel ghost.
Background technology
Thin Film Transistor-LCD (Thin Film Transistor Liquid Crystal Display, TFT-
LCD) there is small volume, low in energy consumption, radiationless, high resolution, leading position is occupied in current display field,
And oneself is through being widely used in various digital information equipment.
TFT-LCD make use of change (such as temperature, electromagnetic field) of the molecules align of liquid crystal to external environment it is very sensitive,
When Liquid Crystal Molecules Alignment changes, its optical property also changes this physical characteristic, two blocks of glass of LCDs therewith
The liquid crystal molecule of motion is flooded among substrate.When the electrode in TFT-LCD produces electric field, signal voltage directly controls film
The on off state of crystal, transistor controls liquid crystal molecule is recycled, liquid crystal molecule will produce distortion, therein so as to will be travelling through
Light carries out well-regulated refraction, and the display of image is realized on TFT-LCD screen.If TFT-LCD screen display length
During time static constant picture, the charged ion absorption in liquid crystal forms built in field, picture switching at upper and lower glass both ends
These ions do not discharge at once afterwards so that liquid crystal molecule does not go to the angle that should turn at once, and to will result in picture residual
Shadow phenomenon.
And TFT-LCD is when applied to fields such as ad distribution and public information displays, due in such an application, institute
The picture of display is often not change a few hours, and TFT-LCD screen can be caused ghost phenomena occur.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus for preventing liquid crystal display panel ghost, to solve TFT-LCD
When shown picture does not change for a long time, TFT-LCD screen is caused the problem of ghost phenomena occur.
The purpose of the present invention is achieved through the following technical solutions：
The embodiment of the present invention provides a kind of method for preventing liquid crystal display panel ghost, including：
Periodically obtain frame data；
Whether identical compare presently described frame data and the previous frame data obtained of acquisition, if so, then by ghost
Amendment enable signal puts high level, if it is not, the ghost amendment enable signal then is set low into level；
When the ghost amendment enable signal continuously keeps the duration of high level to exceed first threshold, according to original public
The amendment voltage that voltage generation is offset downward, the amendment voltage is supplied to the liquid crystal display panel as current common electrical
Press and revert to the original common electric voltage again after keeping an amendment duration.
In the present embodiment, the frame data are periodically obtained by lasting progress and is compared and obtains corresponding
The amendment enable signal, it is described when determining that the frame data do not change for a long time according to the amendment enable signal
Liquid crystal display panel provides the amendment voltage, so as to correct the deflection angle of liquid crystal molecule, prevents liquid crystal display panel from occurring
Ghost phenomena.
Preferably, the cycle for periodically obtaining the frame data is the K seconds, K=1,2,3 ... N, N are natural number.
In the present embodiment, it can be carried out flexibly setting the acquisition frame data according to the display situation or treatment effeciency of still frame
Cycle.
Preferably, the amendment voltage offset downward according to the generation of original common electric voltage, including：
According to the original common electric voltage, generation offsets downward at least 0.1 volt of amendment voltage.
In the present embodiment, by adjusting the original common electric voltage, the deflection angle of liquid crystal molecule is corrected.
Preferably, the amendment duration is at least greater than or equal to 5 minutes.In the present embodiment, by with the amendment voltage
Certain time length is kept, the deflection angle of liquid crystal molecule can be enable to correct completely.
Preferably, the frame data are the picture data transmitted in a manner of low-voltage differential signal.
The embodiment of the present invention has the beneficial effect that：The frame data are periodically obtained by lasting progress and compared
Relatively and the corresponding amendment enable signal is obtained, determine that the frame data do not occur for a long time according to the amendment enable signal
During change, the amendment voltage is provided for the liquid crystal display panel, so as to correct the deflection angle of liquid crystal molecule, prevents liquid crystal
There is ghost phenomena in display panel.
The embodiment of the present invention also provides a kind of device for preventing liquid crystal display panel ghost, including：
Acquiring unit, for periodically obtaining frame data；
Comparing unit, whether the presently described frame data and the previous frame data obtained for comparing acquisition are identical,
If so, ghost amendment enable signal is then put into high level, if it is not, the ghost amendment enable signal then is set low into level；
Processing unit, for continuously keeping the duration of high level to exceed first threshold when the ghost amendment enable signal
When, the amendment voltage offset downward is generated according to original common electric voltage, the amendment voltage is supplied to the LCD
Plate reverts to the original common electric voltage again as current common electric voltage and after keeping an amendment duration.
In the present embodiment, the frame data are periodically obtained by the lasting progress of the acquiring unit, and by described
Unit is compared and obtains the corresponding amendment enable signal, and the processing unit determines according to the amendment enable signal
When the frame data do not change for a long time, the amendment voltage is provided for the liquid crystal display panel, so as to correct liquid crystal
The deflection angle of molecule, prevents liquid crystal display panel from ghost phenomena occur.
Preferably, the cycle that the acquiring unit periodically obtains the frame data is the K seconds, K=1,2,3,
... N, N are natural number.In the present embodiment, can flexibly it be set according to the display situation or treatment effeciency of still frame
Put the cycle for obtaining the frame data.
Preferably, the amendment voltage that the processing unit is offset downward according to the generation of original common electric voltage, including：
According to the original common electric voltage, generation offsets downward at least 0.1 volt of amendment voltage.
In the present embodiment, the processing unit corrects the deflection angle of liquid crystal molecule by adjusting the original common electric voltage
Degree.
Preferably, the amendment duration is at least greater than or equal to 5 minutes.In the present embodiment, the processing unit by with
The amendment voltage keeps certain time length, and the deflection angle of liquid crystal molecule can be enable to correct completely.
Preferably, the frame data are the picture data transmitted in a manner of low-voltage differential signal.
The embodiment of the present invention has the beneficial effect that：The frame is periodically obtained by the lasting progress of the acquiring unit
Data, and be compared by the unit and obtain the corresponding amendment enable signal, the processing unit is repaiied according to
When positive enable signal determines that the frame data do not change for a long time, the amendment electricity is provided for the liquid crystal display panel
Pressure, so as to correct the deflection angle of liquid crystal molecule, prevents liquid crystal display panel from ghost phenomena occur.
Brief description of the drawings
Fig. 1 is a kind of flow chart of method for preventing liquid crystal display panel ghost provided in an embodiment of the present invention；
Fig. 2 is schematic diagram when being transmitted in the embodiment of the present invention in a manner of frame data are low-voltage differential signal；
Fig. 3 is the first frame data data (N) and first frame data in the N-1 cycles obtained in the N cycles obtained
Data (N-1) identical schematic diagram；
Fig. 4 is the first frame data data (N) and first frame data in the N-1 cycles obtained in the N cycles obtained
The schematic diagram that data (N-1) is differed；
Fig. 5 is the schematic diagram of ghost amendment enable signal；
Fig. 6 is a kind of schematic diagram of device for preventing liquid crystal display panel ghost provided in an embodiment of the present invention.
Embodiment
The implementation process of the embodiment of the present invention is described in detail with reference to Figure of description.It should be noted that
Same or similar label represents same or similar element or the element with same or like function from beginning to end.Lead to below
It is exemplary to cross the embodiment being described with reference to the drawings, and is only used for explaining the present invention, and is not considered as limiting the invention.
Referring to Fig. 1, the embodiment of the present invention provides a kind of method for preventing liquid crystal display panel ghost, including：
101, periodically obtain frame data.
When periodically obtaining frame data, the week including current frame data and the previous frame data periodically obtained can be preserved
Whole frame data that phase property obtains.Such as the frame data for obtaining periodicity are stored in random access memory.
102, compare acquisition current frame data and obtain previous frame data it is whether identical, if so, then by ghost amendment
Enable signal puts high level, if it is not, ghost amendment enable signal then is set low into level.
103, when ghost amendment enable signal continuously keeps the duration of high level to exceed first threshold, according to original public
The amendment voltage that voltage generation is offset downward, amendment voltage is supplied to liquid crystal display panel as current common electric voltage and kept
Original common electric voltage is reverted to again after one amendment duration.
In the present embodiment, frame data are periodically obtained by lasting progress and relatively and accordingly corrected
Enable signal, when determining that frame data do not change for a long time according to amendment enable signal, amendment is provided for liquid crystal display panel
Voltage, so as to correct the deflection angle of liquid crystal molecule, prevent liquid crystal display panel from ghost phenomena occur.
Preferably, the cycle for periodically obtaining frame data is the K seconds, K=1,2,3 ... N, N are natural number.For example,
With 1 second for a cycle, each cycle includes 60 frame data, first frame data in each cycle can be obtained, so as to be compared
Compared with, it is understood that it is after first time obtains frame data, to obtain frame data again every 60 seconds and be compared.Cycle is 2
When second, 3 seconds or other durations, principle is identical., can be according to the display situation or treatment effeciency of still frame in the present embodiment
Carry out flexibly setting the cycle for obtaining frame data.
Preferably, the amendment voltage offset downward according to the generation of original common electric voltage, including：
According to original common electric voltage, generation offsets downward at least 0.1 volt of amendment voltage.
Such as original common electric voltage is 5V, then it is that original common electric voltage offsets downward at least 0.1V to correct voltage, therefore is repaiied
Positive voltage is the voltage less than 4.9V, and certainly, the actual original common electric voltage of liquid crystal display panel may be the voltage of other values,
It is adjusted is carried out according to the embodiment of the present invention, will not be repeated here.In the present embodiment, by adjusting original common electric voltage,
Correct the deflection angle of liquid crystal molecule.
Preferably, amendment duration is at least greater than or equal to 5 minutes.In the present embodiment, by keeping certain to correct voltage
Duration, the deflection angle of liquid crystal molecule can be enable to correct completely.
Preferably, frame data are the picture data transmitted in a manner of low-voltage differential signal.
The embodiment of the present invention has the beneficial effect that：Frame data are periodically obtained by lasting progress and compared simultaneously
Obtain correcting enable signal accordingly, be liquid crystal when determining that frame data do not change for a long time according to amendment enable signal
Show that panel provides amendment voltage, so as to correct the deflection angle of liquid crystal molecule, prevent liquid crystal display panel from ghost phenomena occur.
Understand that the present invention provides the above-mentioned method for preventing liquid crystal display panel ghost in order to clearer, with reference to Fig. 2 to Fig. 5
Describe in detail as follows：
Referring to Fig. 2, exemplified by the picture data transmitted in a manner of frame data are low-voltage differential signal, frame data transmission when
Clock signal is RXCLKP and RXCLKP, and the partial transmitting signals of frame data are RX0, RX1 and RX2, with cycle T as acquisition frame number
According to cycle.
Referring to Fig. 3, the first frame data data (N) in the N cycles of the acquisition shown and the first of the N-1 cycles of acquisition
The schematic diagram of frame data data (N-1) the first comparative result, understand as shown in Figure 3, the first frame data data in N cycles
(N) and the N-1 cycles the first frame data data (N-1) it is identical, now ghost amendment enable signal can be put high level.
Referring to Fig. 4, the first frame data data (N) in the N cycles of the acquisition shown and the first of the N-1 cycles of acquisition
The schematic diagram of frame data data (N-1) second of comparative result, it can be seen that the first frame data data (N) in N cycles and
The first frame data data (N-1) in N-1 cycles is differed, and now ghost amendment enable signal can be set low into level level.
Referring to Fig. 5, the schematic diagram of ghost amendment enable signal is shown, wherein, when ghost amendment enable signal S1 height
When level holding duration h exceedes first threshold, you can the amendment voltage offset downward according to the generation of original common electric voltage, will correct
Voltage is supplied to liquid crystal display panel to revert to original common electric voltage again as current common electric voltage and after keeping an amendment duration,
So as to realize the generation for preventing ghost.The first threshold can be any duration, for example, 10 minutes, 15 minutes, 20 minutes, it is 1 small
When or the longer time.
Referring to Fig. 6, the embodiment of the present invention also provides a kind of device for preventing liquid crystal display panel ghost, including：
Acquiring unit 601, for periodically obtaining frame data.
Multiple frame data that acquiring unit 601 periodically obtains can be preserved in random access memory, so as to call
Previous frame data are compared with current frame data.
Comparing unit 602, whether the current frame data and the previous frame data obtained for comparing acquisition are identical, if so,
Ghost amendment enable signal is then put into high level, if it is not, ghost amendment enable signal then is set low into level；
Processing unit 603, for when continuously keeping the duration of high level to exceed first threshold when ghost amendment enable signal,
The amendment voltage offset downward according to the generation of original common electric voltage, amendment voltage is supplied to liquid crystal display panel as current public
Original common electric voltage is reverted to again after common voltage and the amendment duration of holding one.
In the present embodiment, frame data are periodically obtained by the lasting progress of acquiring unit 601, and by comparing unit
602 are compared and obtain correcting enable signal accordingly, when processing unit 603 determines that frame data are long according to amendment enable signal
Between when not changing, provide amendment voltage for liquid crystal display panel, so as to correct the deflection angle of liquid crystal molecule, prevent liquid crystal
There is ghost phenomena in display panel.
Preferably, the cycle that acquiring unit 601 periodically obtains frame data is the K seconds, K=1,2,3 ... N, N are
Natural number.In the present embodiment, it can be carried out flexibly setting acquisition frame number according to the display situation or treatment effeciency of still frame
According to cycle.
Preferably, the amendment voltage that processing unit 603 is offset downward according to the generation of original common electric voltage, including：
According to original common electric voltage, generation offsets downward at least 0.1 volt of amendment voltage.
In the present embodiment, processing unit 603 corrects the deflection angle of liquid crystal molecule by adjusting original common electric voltage.
Preferably, amendment duration is at least greater than or equal to 5 minutes.In the present embodiment, processing unit 603 is by correct electricity
Pressure keeps certain time length, and the deflection angle of liquid crystal molecule can be enable to correct completely.
Preferably, frame data are the picture data transmitted in a manner of low-voltage differential signal.
The embodiment of the present invention has the beneficial effect that：Frame data are periodically obtained by the lasting progress of acquiring unit, and
It is compared by comparing unit and obtains correcting enable signal accordingly, processing unit determines frame data according to amendment enable signal
When not changing for a long time, amendment voltage is provided for liquid crystal display panel, so as to correct the deflection angle of liquid crystal molecule, is prevented
There is ghost phenomena in liquid crystal display panel.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
- A kind of 1. method for preventing liquid crystal display panel ghost, it is characterised in that including：Frame data are periodically obtained, the cycle for periodically obtaining the frame data is the K seconds, K=1,2,3 ... N, N are Natural number；Whether identical compare presently described frame data and the previous frame data obtained of acquisition, if so, then by ghost amendment Enable signal puts high level, if it is not, the ghost amendment enable signal then is set low into level；When the ghost amendment enable signal continuously keeps the duration of high level to exceed first threshold, according to original common electric voltage Generate the amendment voltage that offsets downward, using the amendment voltage be supplied to the liquid crystal display panel as current common electric voltage simultaneously The original common electric voltage is reverted to again after keeping an amendment duration.
- 2. the method as described in claim 1, it is characterised in that the amendment offset downward according to the generation of original common electric voltage Voltage, including：According to the original common electric voltage, generation offsets downward at least 0.1 volt of amendment voltage.
- 3. the method as described in claim 1, it is characterised in that the amendment duration is more than or equal to 5 minutes.
- 4. the method as described in claim 1, it is characterised in that the frame data are transmitted in a manner of low-voltage differential signal Picture data.
- A kind of 5. device for preventing liquid crystal display panel ghost, it is characterised in that including：Acquiring unit, for periodically obtaining frame data, the acquiring unit periodically obtains the cycle of the frame data For the K seconds, K=1,2,3 ... N, N are natural number；Comparing unit, whether the presently described frame data and the previous frame data obtained for comparing acquisition are identical, if so, Ghost amendment enable signal is then put into high level, if it is not, the ghost amendment enable signal then is set low into level；Processing unit, for when the ghost amendment enable signal continuously keeps the duration of high level to exceed first threshold, root According to the amendment voltage that offsets downward of original common electric voltage generation, using the amendment voltage be supplied to the liquid crystal display panel as The original common electric voltage is reverted to again after current common electric voltage and the amendment duration of holding one.
- 6. device as claimed in claim 5, it is characterised in that the processing unit generates downward bias according to original common electric voltage The amendment voltage of shifting, including：According to the original common electric voltage, generation offsets downward at least 0.1 volt of amendment voltage.
- 7. device as claimed in claim 5, it is characterised in that the amendment duration is more than or equal to 5 minutes.
- 8. device as claimed in claim 5, it is characterised in that the frame data are transmitted in a manner of low-voltage differential signal Picture data.
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| CN201510631245.9A CN105139817B (en) | 2015-09-28 | 2015-09-28 | A kind of method and apparatus for preventing liquid crystal display panel ghost |
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| CN201510631245.9A CN105139817B (en) | 2015-09-28 | 2015-09-28 | A kind of method and apparatus for preventing liquid crystal display panel ghost |
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| CN106157919B (en) * | 2016-09-09 | 2019-01-18 | 京东方科技集团股份有限公司 | A kind of display methods and device of liquid crystal display panel |
| CN113889049A (en) * | 2021-09-29 | 2022-01-04 | 歌尔科技有限公司 | Image display method, display terminal and readable storage medium |
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| TWI326441B (en) * | 2006-04-28 | 2010-06-21 | Chimei Innolux Corp | Driving device and driving method of liquid crystal panel |
| US20080106508A1 (en) * | 2006-11-08 | 2008-05-08 | Chunghwa Picture Tubes, Ltd. | Method of preventing image sticking |
| CN101408699A (en) * | 2007-10-11 | 2009-04-15 | 奇美电子股份有限公司 | Source drive module, display and operation method of display |
| CN101866610A (en) * | 2009-04-15 | 2010-10-20 | 沈阳同方多媒体科技有限公司 | Method for protection of plasma television screen |
| CN101615374B (en) * | 2009-07-15 | 2011-05-11 | 广东威创视讯科技股份有限公司 | Device for controlling displaying time of static picture and implementation method thereof |
| CN103051856B (en) * | 2012-12-20 | 2018-10-12 | 康佳集团股份有限公司 | A kind of processing method and system of the compensation of LCD TV moving image |
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