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Seal Design for Liquid Crystal Display

IP.com Disclosure Number: IPCOM000037257D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Takano, H: AUTHOR

Abstract

A seal design which has many creeks on its four sides is disclosed. It is used for the measurement of refractive indices n(e), n(o) and birefringence n(e)-n(o) of liquid crystal materials. These indices are substantially important to design optical properties of a liquid crystal display/printer. A cell thickness (d) of the liquid crystal display/printer is one of the key parameters which affect display/print quality. It is obtained by dividing optical path length (n(e)*d, n(o)*d) or retardation ((n(e)-n(o)0*d) by refractive indices or birefringence. Generally, refractive indices and birefringence depend on pre-tilt angle, temperature, wavelength, and the cell thickness (d). These indices are also obtained by dividing the optical path length or retardation by the cell thickness (d). The disclosed method solves this problem.

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Seal Design for Liquid Crystal Display

A seal design which has many creeks on its four sides is disclosed. It is used for the measurement of refractive indices n(e), n(o) and birefringence n(e)- n(o) of liquid crystal materials. These indices are substantially important to design optical properties of a liquid crystal display/printer. A cell thickness (d) of the liquid crystal display/printer is one of the key parameters which affect display/print quality. It is obtained by dividing optical path length (n(e)*d, n(o)*d) or retardation ((n(e)-n(o)0*d) by refractive indices or birefringence. Generally, refractive indices and birefringence depend on pre-tilt angle, temperature, wavelength, and the cell thickness (d). These indices are also obtained by dividing the optical path length or retardation by the cell thickness (d). The disclosed method solves this problem.

(Image Omitted)

One of the solutions which make use of a standard cell is already proposed. Fig. 1 shows one example of seal design of such serpentine-shaped standard cells and target cells. The seal density of the standard serpentine-cell is so high that glass deformation between before and after liquid crystal injection can be ignored. Even after liquid crystal injection, we can estimate a cell thickness at adjacent air gap portion.

In this disclosure, a better solution is proposed. The proposed seal design is shown in Fig. 2, and it has many creeks which fulfill the same function as the standard serpen...