Liquid crystal display with photodetectors having polarizing plates mounted thereon and its correcting method
AssigneeEizo Nanao Corporation
InventorsMitsuo Ohashi, Katsue Ueda
Life of this patent
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Abstract
The quantity of light from a backlight is monitored by a first photodetector, and the environment on the part of a user is monitored by a second photodetector disposed in the rear of a liquid crystal panel, not on the front thereof. It is possible to exclude the influence of external light from the user side on the first photodetector which detects the quantity of light from the backlight.
Claims4
A liquid crystal display, wherein the quantity of light from a backlight is controlled on the basis of a signal obtained by calculating two or more signals that are detected by two photodetectors whose ratio of incident light from said backlight and an external source are different, and wherein said two photodetectors are disposed behind a liquid crystal panel, the photodetectors each having mounted thereon one of polarizing plates whose directions of polarization are identical with and orthogonal to the direction of polarization of a polarizing plate placed on the side of a backlight with respect to liquid crystal.
Dependencies are inferred from the claim text.