Liquid crystal display
First Claim
1. A transmissive liquid crystal display comprising:
- a transmissive liquid crystal display panel having a display surface;
an optical sensor placed on the rear face of said display surface; and
a backlight for illuminating said display surface,whereinin a first state of the transmissive liquid crystal display panel where a first image having the greatest light transmittance in liquid crystal is displayed on said display surface with said backlight being turned off, said optical sensor detects light that has been directed from the outside of said panel through said display surface,each image to be sensed by an observer of the display surface is illuminated by the backlight at a luminance adjusted based on the detection by the optical sensor in the first state, andsaid first state is set to occur in such a manner to avoid the observer sensing the first image.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a liquid crystal display capable of detecting external light by an optical sensor without providing a window in front of a product. A top face of a liquid crystal display panel (18) corresponds to a display surface. A light-guiding plate (19) is disposed on a rear face of the liquid crystal display panel (18). A backlight (9) shown in FIG. 1 is attached to the light-guiding plate (19). Light emitted from the backlight (9) is guided to the display surface of the liquid crystal display panel (18) by the light-guiding plate (19). A reflection sheet (20) is disposed on a bottom face of the light-guiding plate (19). An optical sensor (10) is attached to a side face of the light-guiding plate (19) with its light-receiving face facing the inside of the light-guiding plate (19).
-
Citations
20 Claims
-
1. A transmissive liquid crystal display comprising:
-
a transmissive liquid crystal display panel having a display surface; an optical sensor placed on the rear face of said display surface; and a backlight for illuminating said display surface, wherein in a first state of the transmissive liquid crystal display panel where a first image having the greatest light transmittance in liquid crystal is displayed on said display surface with said backlight being turned off, said optical sensor detects light that has been directed from the outside of said panel through said display surface, each image to be sensed by an observer of the display surface is illuminated by the backlight at a luminance adjusted based on the detection by the optical sensor in the first state, and said first state is set to occur in such a manner to avoid the observer sensing the first image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A liquid crystal display comprising:
-
a liquid crystal display panel having a display surface on which a plurality of pixels are arranged; an optical sensor placed on the rear face of said display surface; a backlight for illuminating said display surface; and an operation unit for executing predetermined calculations, wherein in a state where a desired image is displayed on said display surface while said backlight is turned off, said optical sensor detects the intensity of external light that has been directed from the outside of said panel through said display surface, based on gradation data of said desired image and said intensity of said external light detected by said optical sensor, said operation unit calculates an adjusted intensity of said external light that would be directed from the outside of said panel through said display surface and detected by said optical sensor, on the assumption tat an image which makes the light transmittance of liquid crystal greatest was displayed on the entire face of said display surface with the backlight being turned off, and based on said adjusted intensity of said external light calculated by said operation unit, the luminance of said display surface is adjusted. - View Dependent Claims (17)
-
-
18. A liquid crystal display comprising:
-
a liquid crystal display panel having a display surface on which a plurality of pixels are arranged; an optical sensor placed on the rear face of said display surface; a backlight for illuminating said display surface; and an operation unit for executing predetermined calculations, wherein in a state where a desired image is displayed on said display surface while said backlight is turned off, said optical sensor detects the intensity of first external light that has been directed from the outside of said panel through said display surface, based on gradation data of said desired image and said intensity of said first external light detected by said optical sensor, said operation unit calculates the intensity of second external light that would be directed from the outside of said panel through said display surface and detected by said optical sensor, on the assumption that an image which makes the light transmittance of liquid crystal greatest was displayed on the entire face of said display surface with the backlight being turned off, and based on said intensity of said second external light calculated by said operation unit, the luminance of said display surface is adjusted, wherein said operation unit calculates said gradation data of said desired image by dividing the sum of all the gradation data of said pixels in the case where said desired image is displayed on said display surface by the number of all the pixels, and upon finding said sum, said operation unit multiplies each gradation data of said pixels by a correction coefficient determined depending on positions of the respective pixels within said display surface. - View Dependent Claims (19, 20)
-
Specification