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US 5,132,820 AGranted
TFT active matrix liquid crystal display devices
AssigneeHitachi, Ltd.
InventorsSakae Someya, Ryuuzoh Nashimoto, Hirofumi Suzuki, Katsuhiko Yarita, Shinji Matsumoto, Akira Sasano, Hideaki Taniguchi, Ryouji Oritsuki
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Abstract
There are disclosed various types of TFT active matrix liquid crystal display devices in which a pixel is divided into three parts, a capacitor is added to each pixel, light shielding is applied to each TFT, and the matrix is driven by a DC cancelling technique.
Claims22
In a liquid crystal display device comprising:
- a thin film transistor;
- a pixel electrode;
- and
- a pixel including said thin film transistor and said pixel electrode and disposed in each of intersection regions defined by two adjacent scanning signal lines and by two adjacent image signal lines,
- the improvement characterized in that:
- for said pixel electrode of said pixel selected by one of said two scanning signal lines, there is constituted a holding capacity element, with a dielectric film interposed, in which said pixel electrode serves as one electrode thereof, and the other of said two scanning signal lines serves as the other electrode thereof by its being used as a capacity electrode line;
- between said one electrode of said holding capacity element and said dielectric film, there is formed a base layer composed of a first conductive film and a second conductive film disposed on said first conductive film and having a smaller size and a smaller specific resistance value than those of said first conductive film;
- and said one electrode of said holding capacity element is connected to said first conductive film which is exposed from said second conductive film of said base layer.
5 more elements
A display device comprising:
- a plurality of scanning lines extending in a first direction;
- a plurality of signal lines extending in a second direction;
- and
- a plurality of picture cells each including:
- a first pixel electrode and a second pixel electrode, and
- a first switching element and a second switching element both activated by one of said scanning lines to transmit a signal applied to one of said signal lines to said first and second pixel electrodes, respectively,
- both of said first and second pixel electrodes being arrayed in an area surrounded by said one scanning line and a scanning line adjacent thereto and said one signal line and a signal line adjacent thereto.
4 more elements
A liquid crystal display device comprising:
- a back electrode;
- first to (n+1)th horizontal lines extending in a horizontal direction and arrayed in a vertical direction;
- a vertical scanning circuit for driving said first to (n)th horizontal lines;
- said (n+1)th horizontal line being electrically connected to said back electrode;
- a plurality of signal lines extending in vertical directions and arrayed in horizontal directions;
- a plurality of picture cells arrayed in horizontal and vertical directions to form first to (n)th cell arrays, each pixel of said first to (n)th cell arrays including a pixel electrode, a switching element to transmit a signal applied to one of said signal lines in response to a signal applied to one of said first to (n)th horizontal lines, respectively, and a capacitor with a pair of electrodes one of which is electrically connected to said pixel electrode and the other is electrically connected to one of said second to (n+1)th horizontal lines, respectively;
- and
- a liquid crystal layer formed between each of said pixel electrodes and said back electrode.
5 more elements
Dependencies are inferred from the claim text.