Liquid crystal display device capable of displaying changeable symbols using two substrates

• US 5,513,027 A
• Filed: 10/28/1994
• Issued: 04/30/1996
• Est. Priority Date: 11/04/1993
• Status: Expired due to Fees

• Current Assignee: Eta SA Fabriques dEbauches (The Swatch Group AG)
• Original Assignee: Eta SA Fabriques dEbauches (The Swatch Group AG)
• Inventors: Paratte, Daniel
• Primary Examiner(s): Gross, Anita Pellman
• Assistant Examiner(s): NGUYEN, TIEP HUU
• Application Number:
  US08/331,098
• Time in Patent Office: 550 Days
• Field of Search: 359/87, 359/88, 359/89, 359/54
• US Class Current: 349/139
• CPC Class Codes: G02F 1/134327 Segmented, e.g. alpha numeric display

Abstract

The invention concerns a liquid crystal display device comprising first display electrodes (31-48) and a set of second elongated display electrodes (50-56) formed on a first substrate (11;250) (10;251), and a set of elongated counter electrodes (70-129; 300-359) formed on a second substrate (10;251) facing the first substrate (11;250) and superposed with said second display electrodes (50-56) so as to create a matrix display of display elements. The counter electrodes (70-129; 300-359) are juxtaposed along substantially their whole length. The counter electrodes are also superposed with the first display electrode so as to display a fixed display symbol. Furthermore, the distance separating the counter electrodes (70-129; 300-359) from each other is substantially less than the width of said first display electrode (31-38).

Claims

1. A display device comprising:

a first substrate and a second substrate spaced apart and facing each other,

a liquid crystal film switchable being two states which are optically perceptible, said film being enclosed in the space delimited by said first and second substrates,

at least a first display electrode formed on the face of said first substrate which faces said second substrate,

a set of elongated display electrodes formed on the face of said first substrate facing said second substrate, and

a set of elongated counter-electrodes formed on the face of said second substrate facing said first substrate, said counter-electrodes being superposed with said elongated display electrodes so as to be capable of displaying therewith symbols which are changeable by selective application of a switching voltage therebetween, said elongated display electrodes being juxtaposed in a first general direction across substantially the entire length of said first substrate, said counter-electrodes being juxtaposed across substantially the entire width of said second substrate and substantially their whole length in a second general direction perpendicular to said first general direction so as to create a matrix of display elements for forming said changeable display symbols, said counter-electrodes being also superposed with said first display electrode so as to create therewith a fixed display symbol when a switching voltage is applied therebetween, and the distance separating each adjacent counter-electrode being substantially less than the width of said first display electrode.

2. A display device according to claim 1, wherein said counter-electrodes are divided into a plurality of spaced-apart groups each for displaying an individual changeable display symbol, said set of counter-electrodes further comprising at least a counter-electrode part connected to an adjacent counter-electrode, said counter-electrode part being positioned in the space between adjacent groups of counter-electrodes.

3. A display device according to claim 1, further comprising:

at least an additional display electrode formed on the face of said first substrate facing said second substrate, said counter-electrodes being superposed with said additional display electrode so as to create a further fixed display symbol when said switching voltage is applied therebetween, said first display electrode and said additional display electrode being positioned on opposing lateral sides of said set of elongated display electrodes.