Reflective type color liquid crystal device and an electronic apparatus using this

• US 7,286,194 B2
• Filed: 01/05/2007
• Issued: 10/23/2007
• Est. Priority Date: 07/17/1995
• Status: Expired due to Fees

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Maeda, Tsuyoshi, Matsushima, Toshiharu, Okumura, Osamu, Okamoto, Eiji
• Primary Examiner(s): TON, MINH TOAN T
• Application Number:
  US11/649,854
• Publication Number:
  US 20070115404A1
• Time in Patent Office: 291 Days
• Field of Search: 349/64, 349/113, 359494-495, 359/500, 359/256, 359/487
• US Class Current: 349/64
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: G02F 2203/66 Normally white display, i.e. the off state being white

Abstract

A reflective type color liquid crystal device can include a pair of substrates and a plurality of color filters with colors different from each other, all of the plurality of color filters having an average transmissivity of 70% to 90% for light of all wavelengths in a range of 450 nm to 660 nm. In addition, a reflective type color liquid crystal device can include a pair of opposing substrates, a liquid crystal layer between the substrates, a plurality of dots capable of independently applying voltage to the liquid crystal layer, each dot having a dot area that includes a first section and a second section, a color filter arranged in the first section, and a layer arranged in the second section where the color filter is not arranged, the layer being substantially transparent.

Claims

1. A liquid crystal device comprising:

a pair of substrates;

a liquid crystal layer between the pair of substrates; and

a scattering reflective plate disposed between the liquid crystal layer and one of the pair of substrates, the scattering reflective plate having a light scattering surface, the scattering reflective plate reflecting 80% or more of impinging light into a 30°

cone.

2. The liquid crystal device according to claim 1, the scattering reflective plate reflecting 95% or less of the impinging light into the 30°

cone.

3. The liquid crystal device according to claim 1, the scattering reflective plate reflecting 80% or more of light impinging light at a 45°

angle into the 30°

cone.