Optics: measuring and testing – Lamp beam direction or pattern
Patent
1995-09-05
1997-06-10
Gonzalez, Frank
Optics: measuring and testing
Lamp beam direction or pattern
356394, 348189, G01J 100
Patent
active
056381670
ABSTRACT:
A display screen inspecting method wherein, a plurality of display picture elements are selected, as markers, from a display screen and light receiving picture elements corresponding to the display picture elements are selected. The light amounts of the display picture elements are measured using the light receiving picture elements and each of the light amounts thus measured is fitted to a predetermined function form symmetric with respect to the center thereof such that the center of each display position is obtained. The difference in position between each of the center positions and each of the specified corresponding light receiving picture elements is obtained and based on such positional differences, a strain of the display screen or a positional shift between the display screen and an inspection screen, in terms of a positional function, is obtained. Portions where moire fringes will occur, are estimated; but the light receiving signals of light receiving picture elements present at the portions where moire fringes occur. An inspection screen is reconstructed based on the light receiving signals of the remaining light receiving picture element; and there is obtained the relationship between the received light amount of the light receiving picture elements on the inspection screen thus reconstructed and the display light amount of the display picture elements corresponding to the light receiving picture elements.
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Gonzalez Frank
Otsuka Electronics Co., Ltd.
Smith Zandra V.
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