Television – Display or receiver with built-in test signal generator,... – Setup
Reexamination Certificate
1999-02-18
2002-06-11
Harvey, David E. (Department: 2714)
Television
Display or receiver with built-in test signal generator,...
Setup
C348S383000, C348S745000
Reexamination Certificate
active
06404456
ABSTRACT:
BACKGROUND
This invention relates generally to projection displays, e.g., computer monitors or televisions that project an image onto a screen to enlarge the image.
A display wall may be formed from a plurality of displays, each displaying a portion of an overall composite image. In a wall display, commonly used in retail stores and sports events, a plurality of displays are arranged in an array or grid, such that the displays are sufficiently close to one another that they are able to collectively display a composite image, formed of the portions displayed by each individual display.
Non-uniformity may arise in the composite display because of variations between the different individual displays making up the composite. For example, one display may have a lower light output than the others, causing it to appear distinctly different, disrupting the uniformity of the overall display. Such variations may arise because of variations in the processes used to manufacture the individual displays or due to variations in the adjustment of the brightness and contrast between various displays.
Display walls may be formed of displays which use liquid crystal projection techniques. A light path, which may include a light source, lenses, and a light valve may be used to create an image from a video input. The image may be projected onto a large display screen to form an individual display unit. In one technique for forming such light valves, a reflective liquid crystal display (LCD) may have a reflective surface on one side.
Semiconductor process variations may cause variations in the image created by one display, compared to others formed by the same process, by the same manufacturer. In addition, variations may produce a blockiness to the composite display, which decreases the composite effect the display wall attempts to create.
Thus, there is a need to improve the uniformity of projection displays.
SUMMARY
In accordance with one aspect, a method of calibrating a projection display includes generating a light output containing image information. A sample is extracted from the light output and is used to calibrate the display. The light output is then projected onto a display screen.
REFERENCES:
patent: 4739396 (1988-04-01), Hyatt
patent: 4868668 (1989-09-01), Tavernetti
patent: 6219011 (2001-04-01), Aloni et al.
Smith, U.S. Patent Application Serial No. 09/259,396, filed Feb. 26, 1999, entitled “Correcting Non-Uniformity in Displays” (US PN#6,285,349).
Harvey David E.
Intel Corporation
Trop Pruner & Hu P.C.
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