Warp resistant liquid crystal display device

• US 6,639,645 B2
• Filed: 02/23/2001
• Issued: 10/28/2003
• Est. Priority Date: 02/23/2000
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Sakuwa, Tohru
• Primary Examiner(s): Chowdhury, Tarifur R.
• Application Number:
  US09/792,350
• Publication Number:
  US 20010015787A1
• Time in Patent Office: 977 Days
• Field of Search: 349/73, 349/74, 349/96, 349/84, 349/123, 349/158
• US Class Current: 349/158
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 2203/02 reflective

Abstract

An object of the invention is to provide a liquid crystal display device using plastic substrates in which deformation such as warpage and distortion hardly occurs. The reflection type liquid crystal display device includes a light transmitting plastic substrate and a plastic substrate provided with a reflecting layer. The substrates are positioned facing each other to be kept fixed relative to each other with a predetermined space therebetween defined by spacers or the like. A liquid crystal layer is formed in the space between the substrates and sealed with a sealing agent. A polarizing plate along with an adhesive is attached to the outer surface of the light transmitting plastic substrate, and a polycarbonate substrate along with an adhesive is attached to the outer surface of the reflector-attached plastic substrate.

Claims

1. A liquid crystal display device comprising:

a light transmitting first plastic substrate;

a second plastic substrate having a reflective layer formed on a surface thereof;

a liquid crystal layer interposed between said first and second plastic substrates such that the surface of the second plastic substrate having a reflective layer formed thereon faces the first plastic substrate through the liquid crystal layer;

a first polarizing plate including a first polarizing film having a first orientation axis direction formed on the outer surface of said first plastic substrate; and

a second plate having polarizing capabilities including a second film having polarizing capabilities formed on the outer surface of said second plastic substrate, said second film having a second orientation axis direction;

wherein said first orientation axis direction of said first polarizing film of said first polarizing plate is parallel to said second orientation axis direction of said second film of said second plate.

2. A liquid crystal display device comprising:

a light transmitting first plastic substrate;

a second plastic substrate having a reflective layer formed on a surface thereof;

a liquid crystal layer interposed between the first and second plastic substrates such that the surface of the second plastic substrate having a reflective layer formed thereon faces the first plastic substrate through the liquid crystal layer;

a polarizing plate having a first orientation axis direction formed on the outer surface of said first plastic substrate; and

a third plastic substrate including an oriented film having a second orientation axis direction, said third plastic substrate being formed on the outer surface of said second plastic substrate such that neither said second plastic substrate nor said third plastic substrate are so disposed relative to the other elements of said liquid crystal display device as to function as optical elements thereof;

wherein said second orientation axis direction of said oriented film is parallel to said first orientation axis direction of said polarizing plate.