Image display device
First Claim
1. An image display device arranged to irradiate a ray of light from a light source onto display devices, form an optical image corresponding with a video signal, and expansively project said optical image, comprising:
- a reflection mirror which reflects said ray of light irradiated onto said display devices;
an optical sensor which detects a light intensity after irradiating said ray of light onto said display devices;
a drive circuit which causes said display devices to be driven; and
a control circuit which controls said drive circuit based on said light intensity detected by said optical sensor; and
said optical sensor being located on said reflection mirror.
1 Assignment
0 Petitions
Accused Products
Abstract
An image display device is arranged to irradiate a ray of light from a light source into liquid crystal display devices, form an optical image corresponding with a video signal, and expansively project the optical image. The image display device includes a reflection mirror for reflecting the ray of light irradiated onto the liquid crystal display devices, an optical sensor being located on the reflection mirror and for detecting a light intensity, a drive circuit that causes the liquid crystal display devices to be driven, and a control unit that controls the drive circuit based on the light intensity detected by the optical sensor. In operation, the image display device provides a capability of adjusting a variable reference voltage of a common electrode brought about by variation with time ascribable to the liquid crystal display devices without preventing display of an input video signal.
110 Citations
17 Claims
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1. An image display device arranged to irradiate a ray of light from a light source onto display devices, form an optical image corresponding with a video signal, and expansively project said optical image, comprising:
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a reflection mirror which reflects said ray of light irradiated onto said display devices;
an optical sensor which detects a light intensity after irradiating said ray of light onto said display devices;
a drive circuit which causes said display devices to be driven; and
a control circuit which controls said drive circuit based on said light intensity detected by said optical sensor; and
said optical sensor being located on said reflection mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image display device arranged to irradiate a ray of light from a light source to display devices, form an optical image corresponding with a video signal, and expansively project said optical image, comprising:
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a screen which forms an image of said expansively projected ray of light and displays said image corresponding with said video signal;
an optical sensor which detects an intensity of said light irradiated onto said display devices;
a drive circuit which causes said display devices to be driven; and
a control circuit which controls said drive circuit based on said intensity of light detected by said optical sensor; and
said optical sensor being located on an outer peripheral portion of said screen. - View Dependent Claims (12, 13)
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14. An image display device comprising:
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a light source;
a display device to which a ray of light is irradiated from said light source and which forms an optical image corresponding with a video signal;
a projection lens unit which expansively projects said optical image;
an optical sensor which detects an intensity of said light irradiated onto said display device;
a drive circuit which causes said display devices to be driven; and
a control circuit which controls said drive circuit based on the light intensity detected by said optical sensor; and
said optical sensor being located within said projection lens unit. - View Dependent Claims (15, 16, 17)
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Specification