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US 5,200,846 AGranted
Electro-optical device having a ratio controlling means for providing gradated display levels
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsMasaaki Hiroki, Akira Mase
Life of this patent
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Abstract
An electro-optical device comprising a display drive system with the display timing related to the unit time t for writing-in a picture element and to the time F for writing-in one picture is disclosed. In the device, a gradated display corresponding to the ratio of the division can be obtained by time-sharing the signal during a write-in of time t without changing the time F.
Claims20
An electro-optical device comprising:
- a pair of substrates;
- an electro-optical modulating layer provided between said substrates;
- matrix lines comprising column control lines and row control lines provided on one of said substrates;
- a plurality of pixel electrodes provided on said one of said substrates;
- a plurality of transistors provided on said one of said substrates, each of the transistors being connected to corresponding one of said pixel electrodes at one of source and drain terminals thereof, to corresponding one of said row control lines at the other one of the source and drain terminals, and to corresponding one of said column control lines at a gate terminal thereof;
- means for supplying a signal to each of said transistors at two signal levels of a reference voltage level and an intermediate level;
- means for addressing said transistors once per an addressing period;
- means for controlling a ratio (a total period of the reference voltage level during the addressing period)/(a total period of the intermediate level during the addressing period);
- and
- means for supplying said reference voltage level at high and low two levels with said intermediate level between said high and low two levels, and with said high and low two levels alternated.
7 more elements
An electro-optical device comprising:
- a pair of substrates;
- an electro-optical modulating layer provided between said substrates;
- matrix lines comprising column control lines and row control lines provided on one of said substrates;
- a plurality of pixel electrodes provided on said one of said substrates;
- p-channel and n-channel transistor pairs provided on said one of said substrates, each pair of the p-channel and n-channel transistors being connected to corresponding one of said pixel electrodes at one of source and drain terminals of the p-channel transistor of said each pair and at one of source and drain terminals of the n-channel transistor of said each pair, to one of corresponding pair of the row control lines at the other one of the source and drain terminals of the p-channel transistor, to the other one of said corresponding pair of the row control lines at the other one of the source and drain terminals of the n-channel transistor, and to corresponding one of said column control lines at gate terminals of the p-channel and n-channel transistors of said each pair;
- means for supplying a signal to each of said p-channel and n-channel transistor pairs at two signal levels of a reference voltage level and an intermediate level;
- means for addressing said p-channel and n-channel transistor pairs once per an addressing period;
- means for controlling a ratio (a total period of the reference voltage level during the addressing period)/(a total period of the intermediate level during the addressing period);
- and
- means for supplying said reference voltage level at high and low two levels with said intermediate level between said high and low two levels, and with said high and low two levels alternated.
7 more elements
An electro-optical device comprising:
- a pair of substrates;
- an electro-optical modulating layer provided between said substrates;
- a plurality of pixels arranged between said substrates in the form of matrix;
- means for addressing said pixels once per an addressing period;
- means for supplying digital data to said pixels by the use of two signal levels of a reference voltage level and an intermediate level;
- means for controlling a ratio (a total period of the reference voltage level during the addressing period)/(a total period of the intermediate level during the addressing period);
- and
- means for supplying said reference voltage level at high and low two levels with said intermediate level between said high and low two levels, and with said high and low two levels alternated.
5 more elements
Dependencies are inferred from the claim text.