Flexible liquid crystal display with touch sensitive screens

• US 5,623,280 A
• Filed: 08/23/1995
• Issued: 04/22/1997
• Est. Priority Date: 06/17/1994
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Akins, Robert B., Pennisi, Robert, Barreto, Joaquin
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): CHIN, VIVIAN C
• Application Number:
  US08/538,170
• Time in Patent Office: 608 Days
• Field of Search: 345/104, 345/102, 345/87, 345/173, 200/5 A
• US Class Current: 345/104
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

A touch sensitive liquid crystal display device (70) having first, second, and third substrates, (40), (76) and (90) and a plurality of raised ribs members (46), (48), (50), (42) and (44) to maintain appropriate spacing between said substrates. Electrically conductive material is disposed on one or more surfaces of the substrates in order to effect a change in the optical characteristics of a liquid crystal material (100) disposed between said second and third substrates.

Claims

1. A touch sensitive liquid crystal display device having a viewer proximal side and a viewer distal side, said device comprising:

a first substrate having first and second surfaces, and having a layer of electrically conductive material disposed on the first surface thereof, said second surface comprising the viewer distal side of said device;

a second substrate having first and second surfaces and formed of a flexible polymeric material, said second substrate further including a plurality of raised ridge members formed on both said first and said second surfaces, and having a layer of electrically conductive material on both of said surfaces in the areas between said raised ridge members, said first surface of said first substrate being arranged in spaced, parallel, facing relationship with the first surface of said second substrate;

a third substrate having first and second surface and formed of a flexible polymeric material, and having a layer of electrically conductive material disposed on the first side thereof, said first surface of said third substrate being arranged in spaced, parallel, facing relationship with the second surface of said second substrate, and said second surface of said third substrate comprising the viewer proximal side of said device; and

a layer of twisted nematic liquid crystal material disposed between said second and third substrates.

2. A display device as in claim 1, further including a layer of reflective material disposed on said second surface of said second substrate.

3. A display device as in claim 1, wherein said electrically conductive material is a transparent electrically conductive material, and wherein said display devices further includes a light source disposed on the viewer distal side thereof.

4. A display device as in claim 1, wherein said space between said first and second substrates is between 1 and 10 micrometers.

5. A display device as in claim 1, wherein said space between said second and third substrate is between 5 and 20 micrometers.