Ferroelectric liquid crystal touch panel

• US 5,122,787 A
• Filed: 01/16/1990
• Issued: 06/16/1992
• Est. Priority Date: 01/18/1989
• Status: Expired due to Fees

• Current Assignee: Seiko Precision Incorporated (Seiko Group Corp.)
• Original Assignee: Seikosha Co., Ltd.
• Inventors: Okamoto, Shinichi, Fujita, Masanori, Ono, Hirokazu
• Primary Examiner(s): Oberley, Alvin E.
• Assistant Examiner(s): Luu, Matthew
• Application Number:
  US07/465,864
• Time in Patent Office: 882 Days
• Field of Search: 340/706, 340/718, 340/719, 340/712, 340/784, 350/350 S, 341/34, 310/311, 310/338, 73/862.04
• US Class Current: 345/97
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

A ferroelectric liquid crystal touch panel includes a ferroelectric liquid crystal panel including counterposed electrodes and a ferroelectric liquid crystal positioned between the electrodes; a position detector for detecting a pushed position on the ferroelectric liquid crystal through the electrodes by means of an electromotive force generated when the ferroelectric liquid crystal is pushed; a display control circuit for controlling a display state of the ferroelectric liquid crystal through the electrodes; a sound generation control circuit for supplying a sound generation signal to the electrodes so that the ferroelectric liquid crystal panel generates a sound in correspondence thereto; and a selection circuit for selectively connecting the position detector, the display control circuit and the sound generation control circuit to the electrodes.

Claims

1. A ferroelectric liquid crystal touch panel comprising:

a ferroelectric liquid crystal panel including counterposed electrodes and a ferroelectric liquid crystal positioned between said electrodes;

position detecting means coupled to said electrodes for detecting a pushed position on said ferroelectric liquid crystal by detecting an electromotive force generated when the ferroelectric liquid crystal is pushed; and

sound generation control means coupled to supply a sound generation signal to said electrodes so that said ferroelectric liquid crystal panel generates a sound in correspondence thereto.

2. A ferroelectric liquid crystal touch panel comprising:

a ferroelectric liquid crystal panel including counterposed electrodes and a ferroelectric liquid crystal positioned between said electrodes;

position detecting means for detecting a pushed position on said ferroelectric liquid crystal by detecting an electromotive force generated when the ferroelectric liquid crystal is pushed;

sound generation control means for supplying a sound generation signal to said electrodes so that said ferroelectric liquid crystal panel generates a sound in correspondence thereto; and

selection means for selectively connecting said position detecting means and said sound generation control means to said electrodes.

3. A ferroelectric liquid crystal touch panel according to claim 2, wherein said selection means includes means for selectively connecting said position detecting means and said sound generation control means to said electrodes in a time sharing manner.

4. A ferroelectric liquid crystal touch panel comprising:

a ferroelectric liquid crystal panel including counterposed electrodes and a ferroelectric liquid crystal positioned between said electrodes;

position detecting means coupled to said electrodes for detecting a pushed position on said ferroelectric liquid crystal by detecting an electromotive force generated when the ferroelectric liquid crystal is pushed; and

display control means coupled to said electrodes for controlling a display state of said ferroelectric liquid crystal through said electrodes; and

sound generation control means for supplying a sound generation signal to said electrodes so that said ferroelectric liquid crystal panel generates a sound in correspondence thereto.

5. A ferroelectric liquid crystal touch panel comprising:

a ferroelectric liquid crystal panel including counterposed electrodes and a ferroelectric liquid crystal positioned between said electrodes;

positioned detecting means for detecting a pushed position on said ferroelectric liquid crystal by detecting an electromotive force generated when the ferroelectric liquid crystal is pushed;

display control means for controlling a display state of said ferroelectric liquid crystal;

sound generation control means for supplying a sound generation signal to said electrodes so that said ferroelectric liquid crystal panel generates a sound in correspondence thereto; and

selection means for selectively connecting said position detecting means, said display control means and said sound generation control means to said electrodes.

6. A ferroelectric liquid crystal touch panel according to claim 5, wherein said selection means includes means for selectively connecting said position detecting means, said display control means and said sound generation control means to said electrodes in a time sharing manner.