Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2003-12-19
2008-10-14
Patel, Nitin (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S089000
Reexamination Certificate
active
07436386
ABSTRACT:
An improved transmission type display device features a light source having plural emission colors and means for controlling the chromaticity of display images, and maintaining it with high precision. The device can be manufactured at low cost by easing the spectral sensitivity tolerances required for the chromaticity sensor. The transmission type display device displays color images by making light emitted from light sources pass through a color-blending part (400) and by controlling the light by an optical shutter (500). The device includes: at least three light detection devices (300) installed in positions closer to the light sources than is the optical shutter, and a light source control circuit which controls emission intensities of light sources of different colors to keep the display chromaticity constant so that sensitivity reading values of said light detection devices are kept constant.The display chromaticity is preferably maintained according to the equationin-line-formulae description="In-line Formulae" end="lead"?D(λ)=S(λ)k(λ)/k′(λ) whereS(λ) is a light source spectrum,in-line-formulae description="In-line Formulae" end="tail"?k(λ) is a transmittance through an optical shutter (500) andk′(λ) is a transmittance directly into color sensors (300).
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Mitsubishi Electric Corporation
Oliver, Esq. Milton
Patel Nitin
Ware Fressola Van Der Sluys & Adolphson LLP
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