Title:
ELECTROOPTICAL DEVICE
Document Type and Number:
Japanese Patent JP3645465
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To display gradation according to the proportion of time-division without causing the deterioration of image quality due to the lowering of frame frequency by increasing the driving frequency of a driver IC and carrying out gradation display.
SOLUTION: In order to provide a complementary structure to two thin film transistors(TFT) and to connect the output terminals to a transparent electrode as one of the pixel electrodes of a liquid crystal device, ITO is formed and etched through a photomask 8 to form an electrode 17, and PTFT 13, NTFT 22 and the electrode 17 comprising a transparent electrically conductive film are thus formed on the same glass substrate 50. A liquid crystal composition is held between the 1st substrate and a 2nd substrate with a means of aligning liquid crystal molecules in a certain direction, a driver IC of TAB form is connected to leads on the 1st substrate and a polarizing plate is stuck to the outside to obtain a transmission type liquid crystal display device. A signal in writing unit time for an arbitrary pixel is time-divided without altering writing time in a screen and gradation is displayed according to the proportion of the time-division.
Inventors:
▲ひろ▼木 正明
Akira Mase
Shunpei Yamazaki
Akira Mase
Shunpei Yamazaki
Application Number:
JP2000029824A
Publication Date:
May 11, 2005
Filing Date:
February 16, 1991
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
G02F1/1343; G02F1/133; G02F1/1345; G02F1/136; G02F1/1368; (IPC1-7): G02F1/1368; G02F1/133; G02F1/1343; G02F1/1345
Domestic Patent References:
| JP336767A | ||||
| JP2234134A | ||||
| JP317629A | ||||
| JP5669864A | ||||
| JP59141271A |
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