CN109147709B - Method and device for multipoint adjusting Flicker of liquid crystal panel - Google Patents
Method and device for multipoint adjusting Flicker of liquid crystal panel Download PDFInfo
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- CN109147709B CN109147709B CN201811178966.9A CN201811178966A CN109147709B CN 109147709 B CN109147709 B CN 109147709B CN 201811178966 A CN201811178966 A CN 201811178966A CN 109147709 B CN109147709 B CN 109147709B
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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
Abstract
The invention discloses a method and a device for multipoint adjusting Flicker of a liquid crystal panel, wherein the method comprises the following steps: s1: dividing the liquid crystal panel into at least one area block, wherein each area block corresponds to a VCOM value; s2: changing the VCOM value of each region block to change the VCOM value within a preset voltage range, and acquiring display images of each region block under different VCOM values; s3: calculating the Flicker value of a plurality of display images corresponding to each VCOM value, and acquiring the Flicker value corresponding to each region block under different VCOM values; s4: searching a VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block; the invention solves the problem of uneven Flicker degree by synchronously adjusting the Flicker of multiple areas on the liquid crystal panel and improves the Flicker adjusting efficiency and accuracy.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a method and a device for multipoint adjusting liquid crystal panel Flicker.
Background
The liquid crystal display is one of the most widely used flat panel displays at present, and the liquid crystal display screen is a core component of the liquid crystal display and has the advantages of low radiation, thin thickness and the like; when the liquid crystal display screen is applied, alternating current driving is needed, so that liquid crystal is driven by positive and negative polarities between each frame, and when the voltage difference applied to the liquid crystal by the two polarities is inconsistent, the brightness of transmitted light between two frames is different, so that flicker is caused; the liquid crystal display panel produced on the market at present always has Flicker phenomenon to a certain extent due to the production process, and when the Flicker degree is higher, human eyes are more unsuitable, so that the watching comfort degree is reduced, the Flicker degree of each liquid crystal module needs to be measured before leaving a factory, and related parameters are adjusted according to the measured values, so that the Flicker degree is reduced to the minimum value.
In order to eliminate the Flicker phenomenon, a plurality of devices and equipment for adjusting the Flicker of the liquid crystal panel appear on the market at present, the most common equipment is a contact type optical probe which is required to be contacted with the surface of the liquid crystal template in the using process, and a plurality of non-contact type optical probes are also arranged; because the Flicker degrees of all places on the liquid crystal panel are different, no matter the liquid crystal panel is a contact type or non-contact type optical probe, the defect that the Flicker degree of a certain point on the liquid crystal panel can only be tested once, and the Flicker value of the point is adjusted to ensure that a small area does not Flicker, but the other areas still have obvious Flicker phenomena, so that the optical probe cannot realize the simultaneous multi-point measurement and adjustment of the liquid crystal panel, and the debugging accuracy and efficiency are low; in addition, the production line needs to detect each liquid crystal module, the optical probe is expensive, and large-scale delivery will result in high equipment input cost.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides a method and a device for adjusting a liquid crystal panel Flicker in multiple points, and aims to solve the problems of low accuracy and efficiency and high equipment cost in Flicker debugging in the prior art.
To achieve the above object, according to one aspect of the present invention, there is provided a method of multi-point adjusting a liquid crystal panel Flicker, comprising the steps of:
s1: dividing the liquid crystal panel into at least one area block, wherein each area block corresponds to a VCOM value;
s2: changing the VCOM value of each region block to change the VCOM value within a preset voltage range, and acquiring display images of each region block under different VCOM values;
s3: calculating the Flicker value of a plurality of display images corresponding to each VCOM value, and acquiring the Flicker value corresponding to each region block under different VCOM values;
s4: and searching a VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block so as to realize synchronous Flicker adjustment of multiple areas of the liquid crystal panel.
Preferably, the step S3 of the method for adjusting the Flicker of the liquid crystal panel at multiple points includes the following substeps:
s31: establishing a corresponding relation curve between the brightness values and the frame rates of a plurality of display images corresponding to each VCOM value of each region block;
s32: and converting the corresponding relation curve into frequency domain information through FFT (fast Fourier transform), and obtaining Flicker values corresponding to the region blocks under different VCOM values according to the frequency domain information.
Preferably, in the method for adjusting the liquid crystal panel Flicker in multiple points, in step S2, the high-speed camera is used to capture the display images of each area block, and the number of the display images corresponding to each VCOM value is equal to the number of frames of the high-speed camera.
Preferably, the method for multipoint adjusting the Flicker of the liquid crystal panel further comprises the following steps before the step S1: and starting the liquid crystal panel to enable the liquid crystal panel to display a preset picture.
According to another aspect of the present invention, there is also provided an apparatus for multi-point adjusting a liquid crystal panel Flicker, comprising a graphic signal generator for generating a graphic signal for driving the liquid crystal panel, a high speed camera, a processor, a memory, and a computer program stored in the memory and executable on the processor;
the computer program, when executed by a processor, controls the high speed camera and the graphics signal generator to implement the steps of the above method.
Preferably, the processor of the device for multipoint adjusting the Flicker of the liquid crystal panel comprises a partitioning module, a first adjusting module, an image processing module and a second adjusting module;
the partitioning module is used for partitioning the liquid crystal panel into a plurality of area blocks according to different VOCM values;
the first adjusting module is used for changing the VCOM value of each area block to change within a preset voltage range;
the image processing module is used for calculating Flicker values of a plurality of display images corresponding to each VCOM value acquired by the high-speed camera according to the brightness values of the plurality of display images, and obtaining the Flicker values corresponding to the region blocks under different VCOM values;
the second adjusting module is used for searching the VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block.
Preferably, in the device for multipoint adjusting the Flicker of the liquid crystal panel, the image processing module comprises an acquisition submodule, a generation submodule and a calculation submodule;
the acquisition submodule is used for acquiring the brightness values of a plurality of display images corresponding to each VCOM value;
the generation submodule is used for establishing a corresponding relation curve between the brightness value and the frame rate of the display image;
and the calculation submodule is used for converting the corresponding relation curve into frequency domain information through FFT (fast Fourier transform), and acquiring Flicker values corresponding to different VCOM values according to the frequency domain information.
Preferably, in the above-mentioned device for multi-point adjusting the liquid crystal panel Flicker, the number of display images corresponding to each VCOM value is equal to the number of frames of the high-speed camera.
Preferably, the high-speed camera of the device for multipoint adjusting the liquid crystal panel Flicker includes, but is not limited to, a CCD camera and a CMOS camera.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the method and the device for adjusting the Flicker of the liquid crystal panel at multiple points provided by the invention synchronously change the VCOM value of each area block on the liquid crystal panel to change within a preset voltage range, collect the corresponding display images of the liquid crystal panel under different VCOM values, process the display images by areas to obtain the Flicker value corresponding to each area block under different VCOM values, search the VCOM value corresponding to the minimum Flicker value and write the VCOM value into the corresponding area block, thereby realizing the synchronous Flicker adjustment of multiple areas of the liquid crystal panel, solving the problem of non-uniform Flicker of different areas on the liquid crystal panel and improving the efficiency and the accuracy of Flicker measurement and adjustment;
(2) according to the method and the device for multipoint adjusting of the Flicker of the liquid crystal panel, the CCD high-speed camera is adopted for image acquisition, a non-contact remote measurement mode is realized, and the method and the device are not limited by space; the cost is low, and the method is suitable for large-scale popularization and use in a production line.
Drawings
FIG. 1 is a flowchart of a method for multi-point adjusting a liquid crystal panel Flicker according to an embodiment of the present invention;
fig. 2 is a graph illustrating a correspondence relationship between a frame rate and a brightness of a region image according to an embodiment of the present invention;
FIG. 3 is a frequency domain information diagram of a region image provided by an embodiment of the present invention;
FIG. 4 is a plot of VCOM value versus Flicker value provided by an embodiment of the present invention;
fig. 5 is a logic block diagram of a processor provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a flowchart of a method for adjusting Flicker of a liquid crystal panel at multiple points according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
s1: starting the liquid crystal panel to enable the liquid crystal panel to display a preset picture;
the graphic signal generator generates a preset picture signal and sends the preset picture signal to the liquid crystal panel, so that the liquid crystal panel displays a corresponding picture. The default picture includes but is not limited to a gray scale picture, an RGB three-color picture, etc., and the setting thereof is determined by the characteristics of the liquid crystal panel, and the graphic signal can be adapted.
S2: dividing the liquid crystal panel into at least one area block, wherein each area block corresponds to a Common Voltage (VCOM) value;
because of the material, process, and technology of the liquid crystal panel, the flicker degrees of various parts on the liquid crystal panel are different, and in order to make the liquid crystal panel exhibit better optical characteristics, the present embodiment divides the liquid crystal panel into a plurality of different region blocks according to the difference of VCOM values, each region block corresponds to one VCOM unit, and the flicker degree of each region block is adjusted respectively.
S3: changing VCOM value of each area block synchronously to change in preset voltage range;
after the liquid crystal panel displays a preset picture, the VCOM value of each area block is respectively adjusted by the drive IC arranged in each area block to enable the VCOM value to change from high to low or from low to high in a preset voltage range, the preset voltage range is determined according to the manufacturing process and the process of the liquid crystal panel, and the voltage ranges are different for different liquid crystal panels; for most liquid crystal panels, the range of change in VCOM value is the same as the gray scale range.
S4: in the change process of the VCOM value, acquiring display images of the region blocks under different VCOM values;
in the change process of the VCOM value, respectively acquiring N display images corresponding to each VCOM value in a certain time by a Charge Coupled Device (CCD) camera arranged above the liquid crystal panel; the frame rate of the camera is different, and the number of the acquired display images is different, for example, a CCD camera with a frame rate of 200fps can acquire 200 display images in about 1 s. In the above scheme, the CCD camera may be replaced with a Complementary Metal Oxide Semiconductor (CMOS) camera.
S5: acquiring the brightness values of N display images corresponding to each VCOM value of each region block, and establishing a corresponding relation curve between the brightness values of the display images and the frame rate;
after acquiring a plurality of display images corresponding to each VCOM value of each region block in the change process of the VCOM value, respectively acquiring the brightness value of the plurality of region images corresponding to each VCOM value corresponding to each region block through image processing, and establishing a corresponding relation curve between the frame rate and the brightness value of each display image; fig. 2 shows a relationship curve between the frame rate and the brightness value of the display image when the VCOM value of a certain region block on the liquid crystal panel is 65, 67, and 85, respectively, and it can be seen from the graph that when the VCOM value is 85, the brightness of the collected region image has the largest variation range.
S6: converting the corresponding relation curve into frequency domain information through FFT, and obtaining Flicker values corresponding to the region blocks under different VCOM values according to the frequency domain information;
converting the relationship curve of the frame rate and the brightness value in fig. 2 into frequency domain information through FFT, and directly obtaining Flicker values corresponding to certain region blocks of the liquid crystal panel under different VCOM values from the frequency domain information; as shown in fig. 3, after the FFT conversion, when the VCOM value is 85, the flicker degree of the display screen of the corresponding region block is 0.28121; when the VCOM value is 65, the flicker degree of the display screen of the corresponding region block is 0.048125;
s7: and searching a VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block so as to realize synchronous Flicker adjustment of multiple areas of the liquid crystal panel.
A relationship curve between the VCOM value of each region block of the liquid crystal panel and the corresponding Flicker value is respectively established, as shown in fig. 4, the VCOM value corresponding to the minimum Flicker value is searched from the relationship curve, the VCOM value corresponding to the minimum Flicker value is written into the VCOM register of the corresponding region block as the optimal VCOM to adjust the VCOM value of the region block to the optimal VCOM, so as to realize synchronous Flicker adjustment of multiple regions of the liquid crystal panel, and the whole liquid crystal panel has the minimum Flicker.
The embodiment of the invention also provides a device for adjusting the Flicker of the liquid crystal panel at multiple points, which comprises a graphic signal generator, a display controller and a controller, wherein the graphic signal generator is used for generating the image signal for driving the liquid crystal panel; the system also comprises a high-speed camera, a memory and an SOPC chip (an FPGA chip integrated with a system on programmable chip SOPC). Wherein the memory has stored therein a plurality of computer programs; the SOPC chip is instantiated with a partition module, a first adjustment module, an image processing module, and a second adjustment module, as shown in fig. 5, the computer program may be run in each functional module in the SOPC chip to make each module implement a corresponding function;
the image signal generator generates an image signal for driving the liquid crystal panel and sends the image signal to the liquid crystal panel to enable the liquid crystal panel to display a corresponding picture;
the partitioning module in the SOPC chip is used for partitioning the liquid crystal panel into a plurality of area blocks according to different VCOM values;
the first adjusting module is used for synchronously changing the VCOM value of each area block to change within a preset voltage range;
the high-speed camera is arranged above the liquid crystal panel and used for collecting a plurality of corresponding display images of each region block under different VCOM values and sending the display images to the SOPC chip; the image processing module in the SOPC chip is used for respectively acquiring the brightness values of a plurality of display images corresponding to each VCOM value of each region block, and calculating to obtain the Flicker value corresponding to each region block under different VCOM values according to the brightness values;
further, the image processing module comprises an acquisition submodule, a generation submodule and a calculation submodule;
the acquisition submodule is used for acquiring the brightness values of a plurality of display images corresponding to each VCOM value;
the generation submodule is used for establishing a corresponding relation curve between the brightness values and the frame rate of a plurality of display images;
and the calculating submodule is used for converting the corresponding relation curve into frequency domain information through FFT (fast Fourier transform), and acquiring Flicker values corresponding to different VCOM values according to the frequency domain information.
The second adjusting module is used for searching the VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block. And writing the VCOM value corresponding to the minimum Flicker value as the optimal VCOM into the VCOM register of the corresponding area block to adjust the VCOM value of the area block to the optimal VCOM, thereby realizing synchronous Flicker adjustment of multiple areas of the liquid crystal panel and ensuring that the whole liquid crystal panel has the minimum Flicker degree.
In the above technical solution, the SOPC chip may also be replaced by other Central Processing Unit (CPU), general purpose processor, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other Programmable logic devices, transistor logic devices, and the like.
Compared with the existing Flicker degree measuring method and device, the method and device for adjusting the Flicker of the liquid crystal panel at multiple points provided by the invention synchronously change the VCOM value of each region block on the liquid crystal panel to change within a preset voltage range, acquire the corresponding display image of the liquid crystal panel under different VCOM values, process the display image by regions to obtain the Flicker value corresponding to each region block under different VCOM values, search the VCOM value corresponding to the minimum Flicker value and write the VCOM value into the corresponding region block, thereby realizing the synchronous Flicker adjustment of the multiple regions of the liquid crystal panel, solving the problem of uneven Flicker degree of different regions on the liquid crystal panel and improving the efficiency and accuracy of Flicker measurement and adjustment.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for adjusting liquid crystal panel Flicker in multiple points is characterized by comprising the following steps:
s1: dividing the liquid crystal panel into at least one area block, wherein each area block corresponds to a VCOM value;
s2: changing the VCOM value of each region block to change the VCOM value within a preset voltage range, and acquiring display images of each region block under different VCOM values;
s3: calculating a Flicker value corresponding to each VCOM value according to the corresponding relation between the brightness value and the frame rate of a plurality of display images corresponding to each region block under each VCOM value, and acquiring the Flicker value corresponding to each region block under different VCOM values; the method specifically comprises the following steps:
s31: establishing a corresponding relation curve between the brightness values and the frame rates of a plurality of display images corresponding to each VCOM value of each region block;
s32: converting the corresponding relation curve into a frequency domain curve through FFT (fast Fourier transform), and obtaining Flicker values corresponding to the region blocks under different VCOM values according to the frequency domain curve;
s4: and searching a VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block.
2. The method of multi-point tuning of liquid crystal panel Flicker of claim 1, wherein in step S2, the high speed camera is used to capture the display images of each region block, and the number of display images corresponding to each VCOM value is equal to the number of frames of the high speed camera.
3. The method of multi-point tuning of a liquid crystal panel Flicker of claim 1, wherein step S1 is preceded by the steps of: and starting the liquid crystal panel to enable the liquid crystal panel to display a preset picture.
4. A device for multipoint adjusting liquid crystal panel Flicker comprises a graphic signal generator for generating image signals for driving the liquid crystal panel; characterized by further comprising a high speed camera, a processor, a memory, and a computer program stored in the memory and executable on the processor;
the computer program, when executed by a processor, controls a high speed camera to carry out the steps of the method according to any one of claims 1-2.
5. The apparatus for multi-point tuning of a liquid crystal panel Flicker of claim 4, wherein said processor comprises a partitioning module, a first tuning module, an image processing module, and a second tuning module;
the partitioning module is used for partitioning the liquid crystal panel into a plurality of area blocks according to different VOCM values;
the first adjusting module is used for changing the VCOM value of each area block to change within a preset voltage range;
the image processing module is used for calculating Flicker values corresponding to the VCOM values according to the corresponding relation between the brightness values and the frame rates of the plurality of display images corresponding to each region block under each VCOM value, which are acquired by the high-speed camera, so as to obtain Flicker values corresponding to the region blocks under different VCOM values;
the second adjusting module is used for searching the VCOM value corresponding to the minimum Flicker value of each area block and writing the VCOM value into the corresponding area block.
6. The apparatus for multi-point adjusting liquid crystal panel Flicker of claim 5, wherein the image processing module comprises an obtaining sub-module, a generating sub-module and a calculating sub-module;
the acquisition submodule is used for acquiring the brightness values of a plurality of display images corresponding to each VCOM value;
the generation submodule is used for establishing a corresponding relation curve between the brightness value and the frame rate of the display image;
and the calculation submodule is used for converting the corresponding relation curve into frequency domain information through FFT (fast Fourier transform), and acquiring Flicker values corresponding to different VCOM values according to the frequency domain information.
7. The apparatus for multi-point adjusting of liquid crystal panel Flicker of claim 4 or 5, wherein the number of display images corresponding to each VCOM value is equal to the number of frames of the high speed camera.
8. The apparatus of claim 4 or 5, wherein the high speed camera is a CCD camera or a CMOS camera.
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| CN110211523B (en) * | 2019-07-26 | 2019-11-05 | 武汉精立电子技术有限公司 | A kind of method, apparatus and system of telemeasurement Flicker value of liquid crystal module |
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