[54] LIQUID CRYSTAL DISPLAY DEVICE WITH COMMONLY CONNECTED CAPACITOR ELECTRODES
[75] Inventor: Yojiro Matsueda, Suwa, Japan
[73] Assignee: Seiko Epson Corp., Tokyo, Japan
[21] Appl. No.: 628,917
[22] Filed: Dec. 14,1990
[30] Foreign Application Priority Data
Dec. 15, 1989 [JP] Japan 1-325037
[51] Int. CI.' G09G3/36
[52] U.S. CI 345/98; 359/59
[58] Field of Search 340/718, 719, 784, 765;
359/54, 55, 57, 58, 59, 87, 88
[56] References Cited
U.S. PATENT DOCUMENTS
4,393.380 7/1983 Hosokawa et al 340/784
4,431,271 2/1984 Okubo 340/784
4,687.298 8/1987 Aoki et al 359/59
4,733.948 3/1988 Kitahara 359/59
4,842,371 6/1989 Yasuda et al 340/784
FOREIGN PATENT DOCUMENTS
0194315 9/1986 European Pat. Off. .
0341003 11/1989 European Pat. Off. .
0376329 7/1990 European Pat. Off. .
0273838 11/1988 Japan 340/784
2050668 1/1981 United Kingdom .
OTHER PUBLICATIONS Y. Matsueda et al., "Optimization of 0.94-in. Poly-Si
TFT Light Valve for LCD Projector", Japan Display-%9, pp. 418-421.
M. Shibusawa et al., "A 212-Line/in. Full-Color TFT-LCD for Cockpit Use", SID 89 Digest, pp. 230-233.
O. Tomita et al., "A 6.5-in.-Diagonal TFT-LCD Module for Liquid Crystal TV", SID 89 Digest, pp. 151-154.
Primary Examiner—Richard Hjerpe
Attorney, Agent, or Firm—W. Douglas Carothers, Jr.
[57] ABSTRACT
A liquid crystal display device is provided with a storage capacitor relative to each pixel electrode, and a common electrode is electrically connected to the storage capacitors of adjacent pixel structures between pairs of adjacent scan lines comprising paired odd and even numbered scan lines. With the utilization of this common electrode structure comprising commonly connected capacitor lines, the number of common electrodes necessary for electrically connecting storage capacitors of the pixel structures can be reduced by one-half and the number of the source electrodes connecting portions of the TFTs can be reduced by onehalf as compared with the conventional technique utilizing a single storage capacitor per pixel structure. Therefore, a high aperture ratio can be maintained in spite of a decrease in pixel pitch to form a more dense pixel array. The common electrode lines could alternatively be formed between pairs of adjacent signal lines rather than pairs of adjacent scan lines, i.e., the common capacitor connection of the storage capacitors by the common electrodes is primary and the directional orientation of the common electrodes is secondary.
10 Claims, 9 Drawing Sheets
