Field emission display with temperature sensing element and meth

Details Field emission display with temperature sensing element and meth Field emission display with temperature sensing element and meth

1998-11-02

1999-08-10

Wong, Don

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

3151691, 313336, 445 50, G09G 310

Patent

active

059363541

ABSTRACT:
A field emission display (100) includes a cathode plate (104) having a plurality of electron emitters (112) and ballast resistors (118), an anode plate (120) having an anode (124), and a temperature compensation circuit (130) having an input (142), an output (134), and a current output (138). Input (142) is connected to unregulated voltage (132), output (134) is connected to gate (116), and current output (138) is connected to temperature sensing element (148). Preferably, temperature sensing element (148) is mounted on cathode plate (104) and matches the temperature vs. resistance characteristics of ballast resistors (118). Temperature compensation circuit (130) outputs current (220) to temperature sensing element (148) and receives ballast voltage (230) from temperature sensing element (148) as a function of temperature of cathode plate (104). Temperature compensation circuit (130) outputs gate voltage (238) to adjust electron emission current (114), and subsequently brightness for variations in temperature.

REFERENCES:
patent: 5828163 (1998-10-01), Jones et al.
patent: 5834900 (1998-11-01), Tanaka et al.

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