Reflection type input/output liquid crystal display

Details Reflection type input/output liquid crystal display Reflection type input/output liquid crystal display

1994-04-28

1997-10-14

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal writing tablet

349 48, 349143, 349162, 345104, G02F 1133, G09G 336

Patent

active

056777442

ABSTRACT:
The display apparatus of the invention includes: a first substrate and a second substrate which are disposed so as to face each other; a display medium having variable optical characteristics sandwiched between the first substrate and the second substrate; a display circuit provided on the first substrate; and a coordinate input section for inputting coordinates of a point on the first substrate. The coordinate input section includes: a plurality of coordinate input electrodes arranged in a matrix on the first substrate; signal lines, formed on the first substrate, for supplying coordinate determination signals to the coordinate input electrodes, respectively; active elements for electrically connecting the coordinate input electrodes to the signal lines, respectively; a coordinate designating member for, when the coordinate designating member is brought near the first substrate, forming an electrostatic capacitance with at least one of the coordinate input electrodes; and a coordinate determination circuit for receiving the coordinate determination signal from the coordinate input electrode, and for determining the coordinates of a point to which the coordinate designating member comes closer, based on the received coordinate determination signal.

REFERENCES:
patent: 4643530 (1987-02-01), Yamazaki
patent: 5194852 (1993-03-01), More et al.
patent: 5204765 (1993-04-01), Mitsui et al.
patent: 5534892 (1996-07-01), Tagawa

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