Inspection method and inspection apparatus of display panel

Abstract

The present invention provides an inspection method and device for a display panel, which may quickly and correctly inspecting display unevenness of a display panel. The method and device use a pick-up member having a lens system and a pick-up element to pick up displayed image, and inspect the display unevenness of the display panel according to the picked up image. The inspection device comprises a focusing member for focusing relative to the display panel of the pick-up member; a dispersal member for dispersing light of the image by adjusting distance between the lens system and the pick-up element, thereby restraining Moire fringe generated when picking-up the displayed image on the display panel. A light filter installation section for installing optical light filter is provided between the lens system and the pick-up element.

Description

technical field [0001] The present invention relates to the inspection of display panels such as liquid crystal displays, and particularly relates to a display that suppresses occurrence of moiré fringes (interference fringes) and light blocking when an image displayed on the display panel is captured and displayed when inspecting display unevenness of the display panel Panel inspection method and inspection device. Background technique [0002] When inspecting a display panel such as a liquid crystal display, it is known that moiré fringes are generated when an image displayed on the display panel is captured by a camera using a CCD (CCD camera). The moiré fringes are generated because the brightness of light received by pixels arranged in a regular lattice matrix changes regularly and repeatedly little by little. That is, both the display panel and the CCD are arranged in a regular lattice matrix of pixels as the unit of the displayed image, but due to the relative positi...

AI Technical Summary

Problems solved by technology

[0013] However, in the methods of removing moiré fringes by image processing in Patent Documents 1 and 2, there are problems that a complicated image processing program is required, the image processing takes time, and inspection efficiency deteriorates.

[0014] In addition, in the methods of Patent Documents 3 and 4, precise control is required to accurately move the camera horizontally while focusing on the display panel, time is required to control the horizontal movement of the camera, and inspection efficiency is deteriorated. problems such as cost increase

[0015] In addition, in the method of blurring the focus of Patent Document 5, there is a problem that the optical axis deviates when the lens system is moved, or because it is difficult to ensure the reproducibility of the focus position, each display panel is separated between the camera and the focus position. Positional deviation occurs between display panels, or operability deteriorates

In addition, when a filter switching mechanism is provided, the filter switching mechanism becomes larger in proportion to the filter diameter.

Moreover, the higher the resolution of the display panel, the more unfavorable it is in terms of size, weight, and cost.

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