CN105139817A - Method and device for preventing ghosting phenomenon on liquid crystal display panel - Google Patents
Method and device for preventing ghosting phenomenon on liquid crystal display panel Download PDFInfo
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- CN105139817A CN105139817A CN201510631245.9A CN201510631245A CN105139817A CN 105139817 A CN105139817 A CN 105139817A CN 201510631245 A CN201510631245 A CN 201510631245A CN 105139817 A CN105139817 A CN 105139817A
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Abstract
The present invention discloses a method and device for preventing the ghosting phenomenon on a liquid crystal display panel, which prevents the ghosting phenomenon on the screen of a TFT-LCD due to the long-term invariableness of the display picture of the TFT-LCD. The method for preventing the ghosting phenomenon on the liquid crystal display panel comprises the steps of periodically acquiring the data of frames, comparing the data of a current frame with the data of a previous frame, setting a ghosting correction enable signal at a high level on the condition that the data of the current frame are the same with the data of the previous frame or setting the ghosting correction enable signal at a low level on the condition that the data of the current frame are not the same with the data of the previous frame, generating a downwardly offset correcting voltage according to an original common voltage on the condition that the duration of the ghosting correction enable signal being kept continuously at the high level exceeds a first threshold, supplying the correcting voltage to the liquid crystal display panel as a current common voltage, keeping the liquid crystal display panel under the application of the current common voltage over a correcting duration of time, and restoring the current common voltage to be the original common voltage.
Description
Technical field
The present invention relates to field of liquid crystal display, particularly relate to a kind of method and apparatus preventing liquid crystal display panel ghost.
Background technology
Thin Film Transistor-LCD (ThinFilmTransistorLiquidCrystalDisplay, TFT-LCD) have that volume is little, low in energy consumption, radiationless, resolution advantages of higher, in current display field, occupy leading position, and oneself is through being widely used in various digital information equipment.
The change (as temperature, electromagnetic field etc.) of the molecules align that TFT-LCD make use of liquid crystal environment is to external world very responsive, when Liquid Crystal Molecules Alignment changes, its optical property also changes this physical characteristics thereupon, is flooded with the liquid crystal molecule of motion in the middle of two pieces of glass substrates of LCDs.When the electrode in TFT-LCD produces electric field, signal voltage directly controls the on off state of film crystal, recycling transistor controls liquid crystal molecule, and liquid crystal molecule will produce distortion, thus the light passed through wherein is carried out well-regulated refraction, the screen of TFT-LCD realizes the display of image.If during the long-time static constant picture of the screen display of TFT-LCD, charged ion in liquid crystal is adsorbed on lower-glass two ends and forms built in field, after picture switches, these ions do not discharge at once, make liquid crystal molecule not forward the angle that should turn at once to and will cause picture ghost phenomena.
And TFT-LCD is when being applied to the field such as ad distribution and public information display, due in such an application, a few hours do not change shown picture often, and the screen of TFT-LCD can be caused to occur ghost phenomena.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus preventing liquid crystal display panel ghost, when not changing for a long time with the picture solved shown by TFT-LCD, cause the screen of TFT-LCD to occur the problem of ghost phenomena.
The object of the invention is to be achieved through the following technical solutions:
The embodiment of the present invention provides a kind of method preventing liquid crystal display panel ghost, comprising:
Periodic getting frame data;
Whether the current described frame data relatively obtained are identical with the last described frame data of acquisition, if so, then ghost correction enable signal set high level, if not, then described ghost correction enable signal set low level;
When described ghost correction enable signal keeps the duration of high level to exceed first threshold continuously, generate the correction voltage offset downward according to original common electric voltage, described correction voltage is supplied to described display panels as current common electric voltage and reverts to described original common electric voltage again after keeping a correction duration.
In the present embodiment, periodically obtain described frame data by the carrying out continued and compare and obtain corresponding described correction enable signal, when determining that described frame data do not change for a long time according to described correction enable signal, for described display panels provides described correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
Preferably, the cycle periodically obtaining described frame data is K second, K=1,2,3 ... N, N are natural number.In the present embodiment, can be set according to the display situation of still frame or treatment effeciency the cycle obtaining described frame data flexibly.
Preferably, describedly generate the correction voltage offset downward according to original common electric voltage, comprising:
According to described original common electric voltage, generate the correction voltage offseting downward at least 0.1 volt.
In the present embodiment, by adjusting described original common electric voltage, revise the deflection angle of liquid crystal molecule.
Preferably, described correction duration is at least more than or equal to 5 minutes.In the present embodiment, by keeping certain time length with described correction voltage, the deflection angle of liquid crystal molecule can be made to be revised completely.
Preferably, described frame data are the picture data transmitted in low-voltage differential signal mode.
Embodiment of the present invention beneficial effect is as follows: periodically obtained described frame data by the carrying out continued and compared and obtain corresponding described correction enable signal, when determining that described frame data do not change for a long time according to described correction enable signal, for described display panels provides described correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
The embodiment of the present invention also provides a kind of device preventing liquid crystal display panel ghost, comprising:
Acquiring unit, for periodic getting frame data;
Comparing unit, whether the last described frame data for the current described frame data with acquisition that compare acquisition are identical, if so, then ghost correction enable signal set high level, if not, then described ghost correction enable signal set low level;
Processing unit, for when described ghost correction enable signal keeps the duration of high level to exceed first threshold continuously, generate the correction voltage offset downward according to original common electric voltage, described correction voltage is supplied to described display panels as current common electric voltage and reverts to described original common electric voltage again after keeping a correction duration.
In the present embodiment, the carrying out continued by described acquiring unit periodically obtains described frame data, and compared by described unit and obtain corresponding described correction enable signal, when described processing unit determines that described frame data do not change for a long time according to described correction enable signal, for described display panels provides described correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
Preferably, the cycle that described acquiring unit periodically obtains described frame data is K second, K=1,2,3 ... N, N are natural number.In the present embodiment, can be set according to the display situation of still frame or treatment effeciency the cycle obtaining described frame data flexibly.
Preferably, described processing unit generates the correction voltage offset downward according to original common electric voltage, comprising:
According to described original common electric voltage, generate the correction voltage offseting downward at least 0.1 volt.
In the present embodiment, described processing unit, by the described original common electric voltage of adjustment, revises the deflection angle of liquid crystal molecule.
Preferably, described correction duration is at least more than or equal to 5 minutes.In the present embodiment, described processing unit, by keeping certain time length with described correction voltage, can make the deflection angle of liquid crystal molecule be revised completely.
Preferably, described frame data are the picture data transmitted in low-voltage differential signal mode.
Embodiment of the present invention beneficial effect is as follows: the carrying out continued by described acquiring unit periodically obtains described frame data, and compared by described unit and obtain corresponding described correction enable signal, when described processing unit determines that described frame data do not change for a long time according to described correction enable signal, for described display panels provides described correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
Accompanying drawing explanation
A kind of process flow diagram preventing the method for liquid crystal display panel ghost that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is be the schematic diagram of low-voltage differential signal mode when transmitting with frame data in the embodiment of the present invention;
Fig. 3 is the schematic diagram that the first frame data data (N) in the N cycle obtained is identical with the first frame data data (N-1) in the N-1 cycle obtained;
Fig. 4 is the schematic diagram that the first frame data data (N) in the N cycle obtained is not identical with the first frame data data (N-1) in the N-1 cycle obtained;
Fig. 5 is the schematic diagram of ghost correction enable signal;
A kind of schematic diagram preventing the device of liquid crystal display panel ghost that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Be described in detail below in conjunction with the implementation procedure of Figure of description to the embodiment of the present invention.It should be noted that same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
See Fig. 1, the embodiment of the present invention provides a kind of method preventing liquid crystal display panel ghost, comprising:
101, periodic getting frame data.
Periodically during getting frame data, whole frame data that the former frame data can preserving current frame data and periodically acquisition obtain in interior periodicity.Such as the frame data periodically obtained are stored in random access memory.
102, whether the current frame data comparing acquisition is identical with the former frame data of acquisition, if so, then ghost correction enable signal set high level, if not, then ghost correction enable signal set low level.
103, when ghost correction enable signal keeps the duration of high level to exceed first threshold continuously, generate the correction voltage offset downward according to original common electric voltage, correction voltage is supplied to display panels as current common electric voltage and reverts to original common electric voltage again after keeping a correction duration.
In the present embodiment, carry out periodic getting frame data by what continue and compare and revised enable signal accordingly, when not changing for a long time according to correction enable signal determination frame data, for display panels provides correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
Preferably, the cycle of periodic getting frame data is K second, K=1,2,3 ... N, N are natural number.Such as, with 1 second for one-period, each cycle comprises 60 frame data, can obtain first frame data in each cycle, thus compare, also can be understood as, and after first time getting frame data, every 60 seconds, getting frame data compared again.Cycle be 2 seconds, 3 seconds or other duration time, principle is identical.In the present embodiment, the cycle of getting frame data can be set flexibly according to the display situation of still frame or treatment effeciency.
Preferably, generate the correction voltage offset downward according to original common electric voltage, comprising:
According to original common electric voltage, generate the correction voltage offseting downward at least 0.1 volt.
Such as original common electric voltage is 5V, then revising voltage is that original common electric voltage offsets downward at least 0.1V, therefore revising voltage is the voltage being less than 4.9V, certainly, the original common electric voltage of display panels reality may be the voltage of other value, its adjustment is carried out according to the embodiment of the present invention, does not repeat them here.In the present embodiment, by adjusting original common electric voltage, revise the deflection angle of liquid crystal molecule.
Preferably, revise duration and be at least more than or equal to 5 minutes.In the present embodiment, by keeping certain time length to revise voltage, the deflection angle of liquid crystal molecule can be made to be revised completely.
Preferably, frame data are the picture data transmitted in low-voltage differential signal mode.
Embodiment of the present invention beneficial effect is as follows: carried out periodic getting frame data by what continue and compared and revised enable signal accordingly, when not changing for a long time according to correction enable signal determination frame data, for display panels provides correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
There is provided the above-mentioned method preventing liquid crystal display panel ghost for a more clear understanding of the present invention, composition graphs 2 to Fig. 5 is described in detail as follows:
See Fig. 2, take frame data as the picture data that low-voltage differential signal mode is transmitted be example, the clock signal of frame data transmission is RXCLKP and RXCLKP, and the partial transmitting signals of frame data is RX0, RX1 and RX2, with the cycle of cycle T as getting frame data.
See Fig. 3, the first frame data data (N) in the N cycle of the acquisition illustrated and the schematic diagram of first frame data data (N-1) the first comparative result in the N-1 cycle obtained, known as shown in Figure 3, the first frame data data (N) in N cycle is identical with the first frame data data (N-1) in N-1 cycle, now ghost correction enable signal can be set high level.
See Fig. 4, the first frame data data (N) in the N cycle of the acquisition illustrated and the schematic diagram of first frame data data (N-1) the second comparative result in the N-1 cycle obtained, as seen from the figure, the first frame data data (N) in N cycle is not identical with the first frame data data (N-1) in N-1 cycle, now ghost correction enable signal can be set low level level.
See Fig. 5, show the schematic diagram of ghost correction enable signal, wherein, when the high level of ghost correction enable signal S1 keeps duration h to exceed first threshold, the correction voltage offset downward can be generated according to original common electric voltage, correction voltage being supplied to display panels as current common electric voltage reverts to original common electric voltage after keeping a correction duration again, thus realizes the generation preventing ghost.This first threshold can be any duration, such as 10 minutes, 15 minutes, 20 minutes, 1 hour or longer time.
See Fig. 6, the embodiment of the present invention also provides a kind of device preventing liquid crystal display panel ghost, comprising:
Acquiring unit 601, for periodic getting frame data.
Multiple frame data that acquiring unit 601 periodically obtains can be preserved in random access memory, thus former frame data can be called and current frame data compares.
Comparing unit 602, whether the former frame data for the current frame data with acquisition that compare acquisition are identical, if so, then ghost correction enable signal set high level, if not, then ghost correction enable signal set low level;
Processing unit 603, for when ghost correction enable signal keeps the duration of high level to exceed first threshold continuously, generate the correction voltage offset downward according to original common electric voltage, correction voltage is supplied to display panels as current common electric voltage and reverts to original common electric voltage again after keeping a correction duration.
In the present embodiment, what continued by acquiring unit 601 carries out periodic getting frame data, and compared by comparing unit 602 and revised enable signal accordingly, when processing unit 603 does not change for a long time according to correction enable signal determination frame data, for display panels provides correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
Preferably, the cycle of the periodic getting frame data of acquiring unit 601 is K second, K=1,2,3 ... N, N are natural number.In the present embodiment, the cycle of getting frame data can be set flexibly according to the display situation of still frame or treatment effeciency.
Preferably, processing unit 603 generates the correction voltage offset downward according to original common electric voltage, comprising:
According to original common electric voltage, generate the correction voltage offseting downward at least 0.1 volt.
In the present embodiment, processing unit 603, by the original common electric voltage of adjustment, revises the deflection angle of liquid crystal molecule.
Preferably, revise duration and be at least more than or equal to 5 minutes.In the present embodiment, processing unit 603, by keeping certain time length to revise voltage, can make the deflection angle of liquid crystal molecule be revised completely.
Preferably, frame data are the picture data transmitted in low-voltage differential signal mode.
Embodiment of the present invention beneficial effect is as follows: what continued by acquiring unit carries out periodic getting frame data, and compared by comparing unit and revised enable signal accordingly, when processing unit does not change for a long time according to correction enable signal determination frame data, for display panels provides correction voltage, thus revise the deflection angle of liquid crystal molecule, prevent display panels from occurring ghost phenomena.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. prevent a method for liquid crystal display panel ghost, it is characterized in that, comprising:
Periodic getting frame data;
Whether the current described frame data relatively obtained are identical with the last described frame data of acquisition, if so, then ghost correction enable signal set high level, if not, then described ghost correction enable signal set low level;
When described ghost correction enable signal keeps the duration of high level to exceed first threshold continuously, generate the correction voltage offset downward according to original common electric voltage, described correction voltage is supplied to described display panels as current common electric voltage and reverts to described original common electric voltage again after keeping a correction duration.
2. the method for claim 1, is characterized in that, the cycle periodically obtaining described frame data is K second, K=1,2,3 ... N, N are natural number.
3. the method for claim 1, is characterized in that, describedly generates the correction voltage offset downward according to original common electric voltage, comprising:
According to described original common electric voltage, generate the correction voltage offseting downward at least 0.1 volt.
4. the method for claim 1, is characterized in that, described correction duration is at least more than or equal to 5 minutes.
5. the method for claim 1, is characterized in that, described frame data are the picture data transmitted in low-voltage differential signal mode.
6. prevent a device for liquid crystal display panel ghost, it is characterized in that, comprising:
Acquiring unit, for periodic getting frame data;
Comparing unit, whether the last described frame data for the current described frame data with acquisition that compare acquisition are identical, if so, then ghost correction enable signal set high level, if not, then described ghost correction enable signal set low level;
Processing unit, for when described ghost correction enable signal keeps the duration of high level to exceed first threshold continuously, generate the correction voltage offset downward according to original common electric voltage, described correction voltage is supplied to described display panels as current common electric voltage and reverts to described original common electric voltage again after keeping a correction duration.
7. device as claimed in claim 6, it is characterized in that, the cycle that described acquiring unit periodically obtains described frame data is K second, K=1,2,3 ... N, N are natural number.
8. device as claimed in claim 6, it is characterized in that, described processing unit generates the correction voltage offset downward according to original common electric voltage, comprising:
According to described original common electric voltage, generate the correction voltage offseting downward at least 0.1 volt.
9. device as claimed in claim 6, it is characterized in that, described correction duration is at least more than or equal to 5 minutes.
10. device as claimed in claim 6, it is characterized in that, described frame data are the picture data transmitted in low-voltage differential signal mode.
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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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| CN105139817B CN105139817B (en) | 2018-03-30 |
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| WO2023050584A1 (en) * | 2021-09-29 | 2023-04-06 | 歌尔股份有限公司 | Image display method, display terminal, and readable storage medium |
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