Active matrix display device

Details Active matrix display device Active matrix display device

1993-06-16

1996-12-24

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 92, 345208, G09G 336

Patent

active

055877222

ABSTRACT:
An active matrix liquid crystal display device comprises pixels composed of a liquid crystal arranged in a matrix and transistors for driving the pixels. In a selected period of time, gate pulses GP are applied to a gate electrode of each transistor for writing video signals in each pixel. Subsequently, in a non-selected period of time, the applying of the gate pulses is stopped for holding the written video signals. In a transition from the selected period of time to the non-selected period of time, the voltage shift of the video signals can be suppressed by shaping of a fall of the gate pulses step-wisely. In place of the above method, the voltage shift of the video signals can be also suppressed by shaping a fall of the gate pulses through dropping the gate pulses after lowering the voltage level of the gate pulses in a specified value once directly before the transition from the selected period of time to the non-selected period of time.

REFERENCES:
patent: 3862360 (1975-01-01), Dill et al.
patent: 4532506 (1985-07-01), Kitajima et al.
patent: 5200741 (1993-04-01), Usui

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