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Display screen contrast detection system and method

A detection system and detection method technology, applied in the direction of static indicators, nonlinear optics, instruments, etc., can solve problems such as inability to guarantee CR value, inability to accurately reflect product quality problems, low detection accuracy, etc.

Active Publication Date: 2021-04-20
KUSN INFOVISION OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the display with mixed viewing angle function needs to measure the CR (Contrast) value in the narrow viewing angle mode on the production line (inline), so as to judge whether the viewing angle in the narrow viewing angle mode reaches the specified range, but in When measuring the CR value, due to product reasons or signal source problems, the CR value measurement may still pass when the product is abnormally lit in the narrow viewing angle mode. It cannot be guaranteed that the measured CR value is measured in the narrow viewing angle mode. Even if the CR value is measured, it cannot accurately reflect the quality problem of the product, and the detection accuracy is low

Method used

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  • Display screen contrast detection system and method

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no. 1 example

[0034] figure 1 It is a schematic structural diagram of the display screen contrast detection system in the first embodiment of the present invention. figure 2 for figure 1 The schematic diagram of the top view of the display screen under test when it displays a white screen. like figure 1 and figure 2 As shown, the display screen contrast detection system of the embodiment of the present invention includes a stage 11, a bracket 15, a brightness detection device 12, an imaging device 13 and a control device 14, the stage 11 is used to carry the display screen 10 to be tested, and the brightness detection device 12 The imaging device 13 is fixed on the bracket 15 and located above the display screen 10 to be tested, and the control device 14 is connected to the display screen 10 to be tested, the brightness detection device 12 and the imaging device 13 respectively.

[0035] The display screen 10 to be tested is a display screen with a mixed viewing angle function, which ...

no. 2 example

[0043] image 3 It is a schematic flow chart of the display screen contrast detection method in the second embodiment of the present invention. Please combine Figure 1 to Figure 3 , the display screen contrast detection method of the present invention can be implemented by the display screen contrast detection system provided in the first embodiment, specifically including the following steps:

[0044] Step 31 , using the control device to control the display screen under test to display a black screen and a white screen containing detection marks in sequence in a narrow viewing angle mode.

[0045] The control device 14 provides a signal source to the display screen 10 to control the display screen 10 to display a black screen and a white screen in stages. In the embodiment of the present invention, the white screen includes a detection mark 101 . Since when the display screen 10 to be tested is in the narrow viewing angle mode, the detection mark 101 will appear to be dis...

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Abstract

A display screen contrast detection system and method, the system includes a stage; a brightness detection device, fixed above the display screen to be tested, and the detection angle is located within the viewing angle range of the display screen to be tested in a narrow viewing angle mode; an imaging device, fixed Above the display screen to be tested and the shooting angle is outside the viewing angle range of the display screen to be tested in the narrow viewing angle mode; the control device is respectively connected with the display screen to be tested, the brightness detection device and the imaging device; In the narrow viewing angle mode, the black screen and the white screen containing the detection mark are displayed in stages. The brightness detection device detects the brightness values ​​of the display screen to be tested in the black screen and the white screen respectively, and the imaging device captures the white screen and generates the graphic comparison value of the detection mark. Finally, calculate the contrast ratio of the display screen to be tested according to the obtained brightness value, and confirm that the contrast ratio is an effective contrast ratio when the graphic contrast value is smaller than the preset value. The invention can ensure that the measured contrast is the effective contrast in the narrow viewing angle mode.

Description

technical field [0001] The invention relates to the technical field of display screen testing, in particular to a display screen contrast detection system and method. Background technique [0002] Liquid crystal display (Liquid Crystal Display, LCD) has many advantages such as light and thin, energy saving, no radiation, has been widely used in high-definition digital TV, desktop computer, personal digital assistant (PDA), notebook computer, mobile phone, digital camera and other electronic equipment. [0003] At present, wide viewing angle is the mainstream development direction of liquid crystal displays. Wide viewing angle technology enables people to see a complete and undistorted picture when viewing the display from different directions. However, when personal privacy and important information are involved, the use of a wide viewing angle display in some occasions will also make people feel inconvenient. For example, when waiting for a bus at a station, people next to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/00G02F1/13
CPCG02F1/1309G09G3/006
Inventor 刘诗平
Owner KUSN INFOVISION OPTOELECTRONICS