Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-09-06
1998-08-11
Saras, Steven J.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345211, 345214, G09G 336, G09G 500
Patent
active
057933464
ABSTRACT:
A circuit and method of clearing a thin film transistor liquid crystal display (TFT LCD) when the external power is removed from the liquid crystal display. The screen clearing circuit consists of a power shut-off detection circuit and discharge circuit which operates to discharge the liquid crystal capacitors and support capacitors when the power is removed from the TFT LCD. The circuit consists of a diode and capacitor connected to a PMOS transistor, in which the diode and capacitor detect a power shut-off, thereby turning on a PMOS transistor so as to form a discharge path to ground for the liquid crystal and support capacitors. The TFT LCD screen is cleared when the capacitors are discharged, thereby eliminating a residual image when the power is turned off.
REFERENCES:
patent: 4422163 (1983-12-01), Oldenkamp
patent: 5248963 (1993-09-01), Yasui et al.
patent: 5430460 (1995-07-01), Takabatake et al.
patent: 5448384 (1995-09-01), Uchino et al.
patent: 5526012 (1996-06-01), Shibahara
patent: 5572735 (1996-11-01), Tanikawa
Lewis David L.
Samsung Electronics Co,. Ltd.
Saras Steven J.
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