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

• US 7,304,701 B2
• Filed: 07/26/2006
• Issued: 12/04/2007
• 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:
  US11/492,885
• Publication Number:
  US 20060268202A1
• Time in Patent Office: 496 Days
• Field of Search: 349/106, 349/113, 349/114
• US Class Current: 349/106
• 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 color liquid crystal device comprising:

a pair of opposing substrates;

a reflective film in a reflective display area; and

a plurality of color filters with colors different from each other, at least one of the color filters being located in the reflective display area, the at least one of the color filters having a transmissivity of 50% or more for light of all wavelengths in a range of 450 nm to 660 nm.

2. A color liquid crystal device according to claim 1:

all of the plurality of color filters have an average transmissivity of 70% to 90% for light of all wavelengths in the range of 450 nm to 660 nm.

3. A color liquid crystal device according to claim 2, further comprising:

a liquid crystal layer interposed between the pair of substrates;

a backlight; and

a reflective plate disposed between the backlight and the liquid crystal layer, the reflective plate being a semi-transmissive reflective plate.

4. A color liquid crystal device according to claim 2, the color filters including:

a red color filter having a transmissivity of 70% or more for all light of wavelengths in a range of 570 nm to 660 nm;

a blue color filter having a transmissivity of 70% or more for all light of wavelengths in a range of 450 nm to 520 nm; and

a green color filter having a transmissivity of 70% or more for all light of wavelengths in a range of 510 nm to 590 nm.

5. A color liquid crystal device according to claim 1, wherein the at least one of the color filters is a green color filter.

6. A color liquid crystal device according to claim 1, the plurality of color filters including a red color filter and a color filter with a color different from red, and a lowest transmissivity of the red color filter is less than a lowest transmissivity of the color filter with the color different from red, for the light of all wavelengths in the range of 450 nm to 660 nm.

7. A color liquid crystal device according to claim 6, wherein the plurality of color filters include the red color filter, a blue color filter and a green color filter.