Method for detecting concave and convex points on the surface of liquid crystal screen and light source device
A technology of light source device and surface unevenness, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of low detection accuracy, excessive light energy, waste, etc., and achieve the effect of improving detection accuracy
Active Publication Date: 2019-10-15
BEIJING LUSTER LIGHTTECH
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Problems solved by technology
When the above light source device is used to irradiate the surface of the liquid crystal screen, the light emitted by the light source device in different directions can realize compensation lighting for the scratches, bumps or pits on the surface of the liquid crystal screen, resulting in bumps, pits or scratches and The normal surface of the LCD screen cannot be effectively distinguished, and the detection accuracy is low while wasting more light energy
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[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] In the detection of the surface of the LCD screen, the lighting method has an important impact on the detection effect. The consistency of the direction of the light emitted by the light source is of great significance to the uneven imaging of the surface of the LCD screen. If the light emitted by the light source can make the uneven points on the surface of the LCD screen appear half-bright and half-dark in the image acquisition device, it can be easily detect...
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Abstract
The embodiment of the invention discloses a detecting method for concave-convex points on the surface of a liquid crystal display and a light source device. The method includes the steps that the to-be-detected liquid crystal display is flat laid on a detecting table; a parallel light beam with the field angle of 5 degrees obliquely irradiates the surface of the to-be-detected liquid crystal display, and a strip-shaped irradiation area is displayed on the surface of the to-be-detected liquid crystal display; a scanning camera is arranged on the other side of the strip-shaped irradiation area, wherein a lens of the scanning camera and the light source device emitting the parallel light beam are critically symmetrical about the central line vertical plane of the strip-shaped irradiating area, and the central line vertical plane of the strip-shaped irradiating area and the long-side direction of the strip-shaped irradiating area are parallel; the light source device moves at a contact speed in the long-side direction of the to-be-detected liquid crystal display, wherein the length of the strip-shaped irradiating area is far larger than the width of the to-be-detected liquid crystal display; the scanning camera and the light source device synchronously move, and images are collected in the strip-shaped irradiating area irradiated by the light source device; if collected images have partly-bright and partly-dark areas, it is determined that the concave-convex points exist on the surface of the to-be-detected liquid crystal display.
Description
technical field [0001] The invention relates to the technical field of liquid crystal display detection equipment, in particular to a detection method for detecting concave and convex points on the surface of a liquid crystal screen and a light source device used for the detection method. Background technique [0002] The structure of the liquid crystal screen usually includes a liquid crystal glass sheet and two polarizers. For the flat liquid crystal glass sheet, one polarizer is attached to the upper surface of the liquid crystal glass, and the other is attached to the lower surface of the liquid crystal glass. During the production process of the liquid crystal screen, during the process of attaching the polarizer to the liquid crystal glass sheet, the surface of the polarizer may be scratched, or pits or bumps may be formed on the surface of the polarizer due to the production process or human factors. In the quality inspection process of LCD screens, it is necessary t...
Claims
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IPC IPC(8): G02F1/13
Inventor 韩楠姚毅
Owner BEIJING LUSTER LIGHTTECH