LCD system with a backlight having a light source at a light pip

Details LCD system with a backlight having a light source at a light pip LCD system with a backlight having a light source at a light pip

1991-05-07

1992-09-08

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 83, 362 31, G02F 11335, G02F 11333, F21V 704

Patent

active

051463547

ABSTRACT:
A backlighted liquid crystal display (LCD) system with a light source and a light pipe which is separated from the LCD panel by an air gap to facilitate uniform brightness of the viewing area. The air gap effectively blocks conductive heat transfer from the light source to the LCD panel. The LCD panel is enframed within a metal frame that serves as a heat sink which prevents a temperature gradient across the LDC panel. The light source is fastened to the light pipe and remaining exposed areas of the light source are covered with an insulating material to trap heat and prevent heat radiation to the LCD panel. A sheet of heat conductive material, which lines the inner back surface of a plastic enclosure surrounding the LCD display assembly, serves to equally distribute heat throughout the inner area of the enclosure. The exposed surface of the heat conductive lining is preferably blackened. Optionally, the heat conductive shield may be included to capture heat radiating from the light source and convey this heat to the heat conductive lining. Insulating material is placed between the heat conductive shield and the metal frame of the LCD panel to prevent heat transfer to the LCD panel.

REFERENCES:
patent: 4042294 (1977-08-01), Billings, Jr. et al.
patent: 4118111 (1978-10-01), Laesser
patent: 4929062 (1990-05-01), Guzik et al.
patent: 4958911 (1990-09-01), Beiswenger et al.
patent: 5046826 (1991-09-01), Iwamoto et al.
patent: 5050946 (1991-09-01), Hathaway et al.
patent: 5064276 (1991-11-01), Endo et al.

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