CN113176677A - Method for testing screen ghost - Google Patents
Method for testing screen ghost Download PDFInfo
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- CN113176677A CN113176677A CN202010738693.XA CN202010738693A CN113176677A CN 113176677 A CN113176677 A CN 113176677A CN 202010738693 A CN202010738693 A CN 202010738693A CN 113176677 A CN113176677 A CN 113176677A
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- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
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- 206010047571 Visual impairment Diseases 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000002950 deficient Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Abstract
The invention relates to the technical field of screen display, in particular to a method for testing a screen ghost, which comprises the following steps: step S1: setting all gray values of pixel points on a screen to be 128; step S2: dividing the screen into 8 by 8 sections; step S3: measuring and recording the brightness value LV of the central point of each block for the first timeBPn(ii) a Step S4: switching the screen to 8-by-8 checkerboard pictures; step S5: switching 8 × 8 checkerboard pictures to pictures with all the gray values of the pixel points on the screen being 128; step S6: measuring and metering the brightness value LV of the central point of each block for the second timeAPn(ii) a Step S7: the maximum luminance difference ratio MAX (ABS (LV)) is calculatedAPn‑LVBPn)/LVBPn) (ii) a Step S8: comparing the maximum brightness difference ratio with 2%, and when the maximum brightness difference ratio is less than or equal to 2%, the screen has no ghost; and when the maximum brightness difference ratio is more than 2%, the screen has a residual shadow. The method for testing the screen ghost can determine whether the screen of the display screen has the ghost phenomenon, and is beneficial to improving the experience of a user.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of screen display, in particular to a method for testing a screen ghost.
[ background of the invention ]
When the display screen stays on a picture for a long time, the charged particles in the liquid crystal in the display screen can be adsorbed at the two ends of the upper glass and the lower glass to form a built-in electric field, after the picture is switched, the charged particles are not released immediately, so that the liquid crystal molecules do not rotate to the corresponding angle immediately to generate the residual image phenomenon, and in addition, the pixel electrodes can also generate the residual image phenomenon due to the disordered arrangement when the picture is switched due to the poor design of the liquid crystal molecules in the design stage.
The generation of the afterimage phenomenon can influence the appearance of a user on a screen, and when the user watches one picture on the screen, the image of the picture does not disappear in time, so that the picture is overlapped with the next picture, and the experience of the user is greatly reduced. The existing testing method relies on subjective judgment, workers are easily influenced by the sensing and testing environment, and judgment errors are easily generated in the production testing process.
Therefore, the prior art is not sufficient and needs to be improved.
[ summary of the invention ]
In order to overcome the technical problem, the invention provides a method for testing the residual image of the screen.
The invention provides a method for testing a screen ghost, which solves the technical problem and comprises the following steps:
step S1: setting all gray values of pixel points on a screen to be 128;
step S2: dividing the screen into 8 by 8 sections;
step S3: measuring and recording the brightness value LV of the central point of each block for the first timeBPn；
Step S4: switching the screen to 8-by-8 checkerboard pictures;
step S5: switching 8 × 8 checkerboard pictures to pictures with all the gray values of the pixel points on the screen being 128;
step S6: measuring and metering each zone for the second timeLuminance value LV of block center pointAPn；
Step S7: the maximum luminance difference ratio MAX (ABS (LV)) is calculatedAPn-LVBPn)/LVBPn)；
Step S8: comparing the maximum brightness difference ratio with 2%, and when the maximum brightness difference ratio is less than or equal to 2%, the screen has no ghost; and when the maximum brightness difference ratio is more than 2%, the screen has a residual shadow.
Preferably, step S1 further includes the steps of:
step S11: the time for keeping the pixel point at the 128 gray value is 5 minutes.
Preferably, step S4 further includes the steps of:
step S41: the time for holding the 8 x 8 checkerboard frame was 60 minutes.
Preferably, step S5 further includes the steps of:
step S51: after switching from the 8 x 8 checkerboard picture to the picture with all the gray values of the pixel points on the screen being 128, the picture is kept for 3 minutes.
Compared with the prior art, the method for testing the screen ghost has the following advantages:
through carrying out the ghost test to the display screen, can confirm out whether the screen can produce the ghost phenomenon, be favorable to whether can produce the ghost to the display screen before the display screen leaves the factory and do the detection, be favorable to solving the problem that the display screen has the ghost from the source, so that the staff maintains or rejects the unqualified product of ghost, reduce the defective products and flow into the possibility that market leads to the reputation of enterprise to descend, make the product of no ghost get into market, do benefit to the reputation of promoting the enterprise, do benefit to the possibility that increases consumer's secondary purchase or recommend other people to purchase.
[ description of the drawings ]
FIG. 1 is a schematic view of a detailed process of the method for testing the screen ghost according to the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be 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.
Referring to fig. 1, the present invention provides a method for testing a screen ghost, which includes the following steps:
step S1: setting all gray values of pixel points on a screen to be 128;
step S2: the screen is partitioned by 8.
It is understood that the gray value may also be set to 64 or 32, and may be actually selected according to the screen performance of the display screen.
In step S2, 64 blocks of the screen are obtained, and the brightness values in the 64 blocks are measured and calculated to determine whether the screen has the afterimage phenomenon.
Preferably, the step S1 further includes the steps of,
step S11: the time for keeping the pixel point at the 128 gray value is 5 minutes.
That is, after step S1, the pixel points on the screen need to be maintained at the 128-gray value for 5 minutes, and the time is longer by standing for 5 minutes, which is beneficial to the gray value of the pixel points on the screen to approach to the preset gray value more accurately, and can effectively avoid the error condition caused by the lower standing time.
Step S3: measuring and recording the brightness value LV of the central point of each block for the first timeBPn。
First measurement of brightness values over 64 blocks and recording of LVBP1…LVBP64And the more accurate initial brightness value of the screen when the gray value of the screen is 128 after the screen is kept still for 5 minutes can be obtained.
Step S4: the screen is switched to an 8 x 8 checkerboard picture.
Step S4 further includes the steps of:
step S41: the time for holding the 8 x 8 checkerboard frame was 60 minutes.
The 8 × 8 checkerboard picture is a picture generated by alternately arranging 0 gray value and 255 gray value.
And standing the 8X 8 checkerboard picture for 60 minutes, wherein after 60 minutes, the brightness value in the 8X 8 checkerboard picture tends to a preset gray value, so that the possibility of error caused by low standing time is reduced.
Step S5: switching 8 × 8 checkerboard pictures to pictures with all the gray values of the pixel points on the screen being 128;
step S6: measuring and metering the brightness value LV of the central point of each block for the second timeAPn。
Preferably, step S5 further includes the steps of:
step S51: after switching from the 8 x 8 checkerboard picture to the picture with all the gray values of the pixel points on the screen being 128, the picture is kept for 3 minutes.
The sheet was left standing for 3 minutes after switching before measuring the brightness value for the second time in step S6. By standing for 3 minutes, the brightness displayed on the screen without the afterimage also tends to the brightness displayed on each partition of the screen at the step S2; after standing for 3 minutes, the screen may have an afterimage because some charged particles in the liquid crystal have not been released, which results in a larger difference in the displayed brightness than the brightness displayed in each block of the screen at step S2. And the second time of brightness value measurement is carried out immediately after switching, the time is short, and at the moment, even if charged particles of liquid crystal in a screen without a residual image cannot be released in time, a large error is generated, and the measurement result is influenced.
After switching and standing for 3 minutes, performing second measurement and calculation on the brightness value of the central point of each block to obtain LVAPn，LVAP1…LVAP64。
Step S7: the maximum luminance difference ratio MAX (ABS (LV)) is calculatedAPn-LVBPn)/LVBPn)。
And comparing the difference ratio of the two brightness values of the same block and obtaining the ratio of the maximum brightness difference.
Step S8: comparing the maximum brightness difference ratio with 2%, and when the maximum brightness difference ratio is less than or equal to 2%, the screen has no ghost; and when the maximum brightness difference ratio is more than 2%, the screen has a residual shadow.
By comparing the maximum brightness difference ratio with 2%, whether the screen has the afterimage phenomenon can be determined. It is understood that 1.75%, 1.5%, or 2.25% may be selected to compare the maximum luminance difference ratio with the ratio of the color difference perceived by the human eye.
Whether the residual shadow phenomenon appears on the screen or not is revealed in a data mode, and the method is more persuasive compared with the method that human eyes observe the residual shadow phenomenon.
Compared with the prior art, the method for testing the screen ghost has the following advantages:
through carrying out the ghost test to the display screen, can confirm out whether the screen can produce the ghost phenomenon, be favorable to whether can produce the ghost to the display screen before the display screen leaves the factory and do the detection, be favorable to solving the problem that the display screen has the ghost from the source, so that the staff maintains or rejects the unqualified product of ghost, reduce the defective products and flow into the possibility that market leads to the reputation of enterprise to descend, make the product of no ghost get into market, do benefit to the reputation of promoting the enterprise, do benefit to the possibility that increases consumer's secondary purchase or recommend other people to purchase.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for testing screen ghost is characterized in that: the method for testing the screen ghost comprises the following steps:
step S1: setting all gray values of pixel points on a screen to be 128;
step S2: dividing the screen into 8 by 8 sections;
step S3: measuring and recording the brightness value LV of the central point of each block for the first timeBPn；
Step S4: switching the screen to 8-by-8 checkerboard pictures;
step S5: switching 8 × 8 checkerboard pictures to pictures with all the gray values of the pixel points on the screen being 128;
step S6: second measurement and measurement of fractionsBrightness LV of block centerAPn；
Step S7: the maximum luminance difference ratio MAX (ABS (LV)) is calculatedAPn-LVBPn)/LVBPn)；
Step S8: comparing the maximum brightness difference ratio with 2%, and when the maximum brightness difference ratio is less than or equal to 2%, the screen has no ghost; and when the maximum brightness difference ratio is more than 2%, the screen has a residual shadow.
2. The method for testing screen ghosting of claim 1, wherein: step S1 further includes the steps of:
step S11: the time for keeping the pixel point at the 128 gray value is 5 minutes.
3. The method for testing screen ghosting of claim 1, wherein: step S4 further includes the steps of:
step S41: the time for holding the 8 x 8 checkerboard frame was 60 minutes.
4. The method for testing screen ghosting of claim 1, wherein: step S5 further includes the steps of:
step S51: after switching from the 8 x 8 checkerboard picture to the picture with all the gray values of the pixel points on the screen being 128, the picture is kept for 3 minutes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137750A (en) * | 2021-12-08 | 2022-03-04 | 武汉中海庭数据技术有限公司 | Method and device for detecting and positioning screen ghost |
| CN114442346A (en) * | 2022-01-25 | 2022-05-06 | 苏州华星光电技术有限公司 | Ghost shadow calculation method and device of display panel, storage medium and terminal equipment |
| CN114137750B (en) * | 2021-12-08 | 2024-05-10 | 武汉中海庭数据技术有限公司 | Method and device for detecting and positioning screen ghost |
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| CN103165057A (en) * | 2013-03-12 | 2013-06-19 | 合肥京东方光电科技有限公司 | Method and device for determining level of residual image of display |
| JP2013127557A (en) * | 2011-12-19 | 2013-06-27 | Japan Display Central Co Ltd | Liquid crystal display device and method for manufacturing the same |
| CN106297613A (en) * | 2016-08-08 | 2017-01-04 | 深圳市华星光电技术有限公司 | A kind of display screen ghost detecting system and method |
| CN109345986A (en) * | 2018-11-02 | 2019-02-15 | 合肥鑫晟光电科技有限公司 | A kind of the image retention determination method and device of display panel |
| CN111341233A (en) * | 2020-04-09 | 2020-06-26 | 昆山国显光电有限公司 | Display panel ghost detection method and detection device |
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2020
- 2020-07-28 CN CN202010738693.XA patent/CN113176677A/en active Pending
Patent Citations (6)
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Cited By (4)
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| CN114137750A (en) * | 2021-12-08 | 2022-03-04 | 武汉中海庭数据技术有限公司 | Method and device for detecting and positioning screen ghost |
| CN114137750B (en) * | 2021-12-08 | 2024-05-10 | 武汉中海庭数据技术有限公司 | Method and device for detecting and positioning screen ghost |
| CN114442346A (en) * | 2022-01-25 | 2022-05-06 | 苏州华星光电技术有限公司 | Ghost shadow calculation method and device of display panel, storage medium and terminal equipment |
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Application publication date: 20210727 |