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    • 10. 发明专利
    • JPH05296938A
    • 1993-11-12
    • JP24237092
    • 1992-09-10
    • PHOTON DYNAMICS INCISHIKAWAJIMA HARIMA HEAVY IND
    • FURANSOA JIEI HENRII
    • G01M11/00G01N17/04G01N21/88G01N21/956G01R31/00G02F1/13G06T1/00G09F9/00G09G3/00
    • PURPOSE: To quickly check a defect of a board by an arrangement wherein a plurality of image pickup means having a specified image pickup range are operated simultaneously, and an image pickup data obtained by controlling the polarity and the level of an inspection voltage is stored and subjected to image processing, and defective pixel information thus extracted is synthesized and displayed. CONSTITUTION: A voltage applying unit 7 applies a bias voltage of specific level, between a transparent thin film electrode 2a and each pixel electrode 13. When no defective pixel is present in a liquid crystal display panel board 5, a field corresponding to the bias voltage level is applied entirely to an electrooptic element 2. Liquid crystal molecules sealed in the element 2 are thereby arranged in same direction and a liquid crystal sheet 8 transmits a light. In other words, when a light is radiated from a light source 1, a light passed through the sheet 8 is reflected on a light reflector 9 toward CCD cameras 3-1,..., 3-N. When a defective pixel is present, the applying field at the corresponding part is varied and the transmittance of the element 2 is varied and the gray level image of a pixel is picked up by means of the cameras 3-1,..., 3-N. It is processed by an image processor 4 and defective pixel information is extracted and synthesized and the overall defective state of the board 5 is displayed and checked.