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Counter Electrode Structure for Liquid Crystal Display

IP.com Disclosure Number: IPCOM000034480D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Kimura, A: AUTHOR [+2]

Abstract

Disclosed is a structure of a counter electrode for a liquid crystal display (LCD) with active matrix thin film transistors (TFTs). The structure allows orientation of a liquid crystal material only over display (pixel) electrodes, which reduces undesirable light leakage and degradation of the liquid crystal material due to voltage across data lines and the counter electrode. A LCD shown in Fig. 1 comprises gate lines 2, data lines 3, display electrodes 4 and liquid crystal material 5, which are sandwiched by two glass substrates 1 and 7. Counter electrodes 6 are deposited and patterned on the substrate 7. Fig. 2 is a cross-sectional view which shows the counter electrodes 6 patterned only on the areas corresponding to the display electrodes 4, respectively.

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Counter Electrode Structure for Liquid Crystal Display

Disclosed is a structure of a counter electrode for a liquid crystal display (LCD) with active matrix thin film transistors (TFTs). The structure allows orientation of a liquid crystal material only over display (pixel) electrodes, which reduces undesirable light leakage and degradation of the liquid crystal material due to voltage across data lines and the counter electrode. A LCD shown in Fig. 1 comprises gate lines 2, data lines 3, display electrodes 4 and liquid crystal material 5, which are sandwiched by two glass substrates 1 and 7. Counter electrodes 6 are deposited and patterned on the substrate 7. Fig. 2 is a cross- sectional view which shows the counter electrodes 6 patterned only on the areas corresponding to the display electrodes 4, respectively. When a voltage is applied across the liquid crystal material, alignment takes place only in between the display electrode 4 and the patterned counter electrode 6, as shown by the hatched area. This structure eliminates alignment of the liquid crystal material over the data lines 3, because of no electrode on the other side. The above structure demonstrates a new way of making a TFT/LCD in which undesirable light leakage is reduced while maintaining sufficient area for the display electrodes. An additional advantage is to reduce degradation due to voltage stress applied to the liquid crystal material over the area of the data lines which carry signal volt...