LCD with self regulating PTC thermistor heating element

Details LCD with self regulating PTC thermistor heating element LCD with self regulating PTC thermistor heating element

1991-07-25

1992-06-02

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

219209, 219522, 359 86, G02F 1133, H05B 306, H05B 300

Patent

active

051192152

ABSTRACT:
Positive temperature coefficient thermistors are mounted in heat transfer relationship to a support member of a material that is pervious to light. The thermistors are positioned on the support member to provide a large unobstructed area through which light may pass. The self-limiting nature of the thermistors eliminates the need for a separate temperature responsive heater control switch. The heater is useable for heating liquid crystal displays, and allows back lighting of such displays by a light source positioned on the opposite side of the heater from the display.

REFERENCES:
patent: 2557705 (1951-06-01), Burton et al.
patent: 4147927 (1979-04-01), Pirotte
patent: 4625163 (1986-11-01), Germer
patent: 4634225 (1987-01-01), Haim et al.
patent: 4724304 (1988-02-01), Teshima et al.
patent: 4845344 (1989-07-01), Price et al.
patent: 4954692 (1990-09-01), Shikama et al.
patent: 4987289 (1991-01-01), Bishop et al.

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