Liquid crystal shutter for backlit digitizer

Details Liquid crystal shutter for backlit digitizer Liquid crystal shutter for backlit digitizer

1992-04-15

1992-12-22

James, Andrew J.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 36, G02F 113

Patent

active

051737930

ABSTRACT:
A digitizer system comprises a source of a light for producing an image, a shutter, and a transparent or translucent digitizer tablet. The source is positioned to direct the image to the tablet via the shutter. The shutter comprises a liquid crystal layer and transparent planar conductors on opposite surfaces of the layer. The system further comprises a source of an adjustable voltage connected between the planar conductors for adjusting the transmissivity of the shutters.

REFERENCES:
patent: 4088400 (1978-05-01), Assouline et al.
patent: 4588982 (1986-05-01), Goodwin
patent: 4724311 (1988-02-01), Mechlenburg
patent: 4786146 (1988-11-01), Ledebuhr
patent: 4796019 (1989-01-01), Auerbach
patent: 4803737 (1989-02-01), Sato et al.
patent: 4873398 (1989-10-01), Hubby, Jr.

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