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US 6,305,806 B1Granted
Projection-type display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYoshiharu Hirakata
Life of this patent
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Abstract
A rear-type projection display device is provided, in which even a liquid crystal panel having several point defects is used, the point defects are hardly recognized. According to the present invention, in order not to display the display defects (the bright spots or unlit defects) that take place when a light from a light source transmits a liquid crystal panel having the point defects, means for correcting the display defects is provided on the liquid crystal panel side of a screen.
Claims15
A projection type display device comprising:
- a light source;
- a screen, said screen enabling a image to be observed from a screen side opposite to the light source;
- at least one panel and an optical system for modulating a light from the light source and for projecting the image to be observed onto the screen;
- a transparent object being in contact with a rear surface of the screen;
- a light shielding object being located on the transparent object, said light shielding object preventing a point defect of the panel from being observed on the screen when a black image is displayed on the screen.
2 more elements
A projecting type display device comprising:
- a light source;
- a screen, said screen enabling a image to be observed from a screen surface side opposite to the light source;
- at least one panel and an optical system for modulating a light from the light source and for projecting the image to be observed onto the screen;
- a transparent object being in contact with a rear surface of the screen;
- a light collecting object being located on the transparent object, the light collecting object preventing a point defect of the panel from being observed on the screen when a white image is displayed on the screen.
2 more elements
Dependencies are inferred from the claim text.