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FILTER FOR COLOR LIQUID CRYSTAL DISPLAYS ADDRESSED BY THIN FILM TRANSISTOR ARRAYS

IP.com Disclosure Number: IPCOM000025358D
Original Publication Date: 1984-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 57K

Publishing Venue

Xerox Disclosure Journal

Abstract

Thin film transistor (TFT) arrays for addressing color liquid crystal displays (LCDs) require filters to modify the transmitted light to produce the desired colors. For a three-color LCD, for example, suitable colors would be red, green, and blue, and each color would require a separate filter. The incident light to be spectrally modulated, of course, must contain wavelengths commensurate with those filters.

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XEROX DISCLOSURE JOURNAL

FILTER FOR COLOR LIQUID CRYSTAL DISPLAYS ADDRESSED BY THIN FILM TRANSISTOR ARRAYS
Joseph J. Wysocki

Proposed Classification
U.S. C1. 350/160

Int. CI. G02f 1/28

Thin film transistor (TFT) arrays for addressing color liquid crystal displays (LCDs) require filters to modify the transmitted light to produce the desired colors. For a three-color LCD, for example, suitable colors would be red, green, and blue, and each color would require a separate filter. The incident light to be spectrally modulated, of course, must contain wavelengths commensurate with those filters.

At least one of the filters can be achieved in a natural way during the course of fabrication of the TFT array; a drain pad could concurrently serve as both the desired conducting drain contact to its LCD cell and a filter. Thus, for example, in a silicon TFT array, the conducting filter/drain pad would be doped silicon in one of its morphological states. Controlling the thickness of the material would control its spectral transmission.

Since most semiconductors absorb more the shorter the wavelength of light, straightforward application of such a drain pad would lead to a red or orange transmitted color. To achieve the other colors, the usual absorbing or interference filters would be required. The composition of the drain pad and filter combination must be that which will pass the incident light through the LCD to give the desired color.

Volume 9 Number 6 November/December 19...