Active matrix display device and method for driving the same

Details Active matrix display device and method for driving the same Active matrix display device and method for driving the same

1987-09-11

1989-04-04

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350333, 340805, G09G 336

Patent

active

048189812

ABSTRACT:
An active matrix display device of an improved and simplified configuration and a driving method for the same are disclosed. The display device according to the present invention is characterized in that data bus lines and scan bus lines are separately formed on first and second transparent substrates respectively and the drain electrode of each TFT on the second substrate is connected to the scan bus line to be addressed next. This configuration eliminates earth bus lines of the prior art. This arrangement has effects of simplifying a bus line design and obtaining a higher yield and an increased opening rate for each display element. In order to drive the above device, an address pulse having a stepped waveform is used. Each address pulse has Vgon, Vgc, and Vgoff levels, and a width of two horizontal scan time. The first step of address pulse Vgc corresponds to the address time of the adjacent scan bus line to be scanned previously; and the second step Vgon corresponds to the address time for the TFT to be scanned. The present invention discloses a voltage relation for waveforms of the address pulse and data pulse in order to obtain a high quality display.

REFERENCES:
patent: 3896430 (1975-07-01), Hatsukano
patent: 3995942 (1976-12-01), Kawakami et al.
patent: 4062626 (1977-12-01), Kawakami et al.
patent: 4112333 (1978-09-01), Asars et al.
patent: 4404555 (1983-09-01), Long et al.
patent: 4556880 (1985-12-01), Hamada
patent: 4717244 (1988-01-01), Hilsum et al.

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