Active matrix liquid crystal display devices having a metal ligh

Details Active matrix liquid crystal display devices having a metal ligh Active matrix liquid crystal display devices having a metal ligh

1991-06-07

1992-07-14

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 67, 359 88, G02F 113

Patent

active

051308290

ABSTRACT:
An active matrix liquid crystal display device includes on a first substrate (30) a row and column array of picture element electrodes (20), associated switching devices (11), e.g. a-Si or polysilicon TFTs, and sets of row and column address conductors (14,16) to which selection and data signals are applied respectively, the picture elements being driven a row at a time in sequence by scanning the row conductors with a selection signal. Each switching device (11) is provided with a metal light shield (45) extending over the active region of the device (11) which is connected (46) electrically to the row address conductor (14) adjacent the one to which the switching device is connected. Because the adjacent row conductor is at a reference potential for most of the time, parasitic capacitance effects due to the metal light shield are negligible.

REFERENCES:
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patent: 4723838 (1988-02-01), Aoki et al.
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patent: 4928095 (1990-05-01), Kawahara
patent: 4936656 (1990-06-01), Yamashita et al.
patent: 4948231 (1990-08-01), Aoki et al.

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