Gradation method for driving liquid crystal device with ramp and

Details Gradation method for driving liquid crystal device with ramp and Gradation method for driving liquid crystal device with ramp and

1992-03-25

1994-02-15

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 84, 345 89, 345 94, G02F 1137

Patent

active

052872050

ABSTRACT:
A novel structure of an active electro-optical device is disclosed. The device is provided with complementary thin film insulated gate field effect transistors (TFTs) therein which comprise a P-TFT and an N-TFT. P-TFT and N-TFT are connected to a common signal line by the gate electrodes thereof, while the source (or drain) electrodes thereof are connected to a common signal line as well as to one of the picture element electrodes.
In case of driving the active electro-optical device, a gradation display can be carried out in a driving method having a display timing determined in relation to a time F for writing one screen and a time (t) for writing in one picture element, by applying a reference signal in a cycle of the time (t), to the signal line used for a certain picture element driving selection, and by applying the select signal to the other signal line at a certain timing within the time (t), and whereby setting the value of the voltage to be applied to a liquid crystal.

REFERENCES:
patent: 4036553 (1977-07-01), Borel et al.
patent: 4841294 (1989-06-01), Clerc
patent: 5017914 (1991-05-01), Uchida et al.
patent: 5157386 (1992-10-01), Uchida et al.

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