Reflective color LCD with color filters having particular transmissivity

• US 20050018108A1
• Filed: 04/21/2004
• Published: 01/27/2005
• Est. Priority Date: 07/17/1995
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Maeda, Tsuyoshi, Matsushima, Toshiharu, Okumura, Osamu, Okamoto, Eiji
• Granted Patent: US 7,209,197 B2
• Time in Patent Office: Days
• 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

The invention comprises a pair of substrates having electrodes on the opposing inner surfaces and forming a matrix-patterned dot group, liquid crystals sandwiched between said substrates, at least two colors of color filters, at least one polarizing plate, and a reflective plate. Also, of said color filters, at least one color of color filters has a transmissivity of 50% or more for the light of all the wavelengths in the range of 450 nm to 660 nm.

Claims

1. A liquid crystal display, comprising:

a first electrode;

a second electrode opposing the first electrode;

a plurality of dots formed at overlapping portions of the first electrode and the second electrode;

a reflector arranged outside the first electrode and the second electrode; and

a plurality of color filters, a color filter being arranged to correspond to each of the plurality of dots, individual dots of the plurality of dots including an area having a color filter and an area having no color filter, and each color filter being separated from adjacent color filters by an additional area having no color filter.

2. The liquid crystal display according to claim 1, each color filter being located at a central portion of the dot.

3. The liquid crystal display according to claim 1, each color filter being divided into a plurality of parts.

4. A liquid crystal display, comprising:

a first electrode;

a second electrode opposing the first electrode;

a plurality of dots formed at overlapping portions of the first electrode and second electrode;

a reflector arranged outside the first electrode and the second electrode; and

a plurality of color filters, a color filter being arranged to correspond to each of the plurality of dots, individual dots of the plurality of dots including an area having a color filter and an area having no color filter, each color filter being separated from adjacent color filters by an additional area having no color filter, and a substantially transparent layer being arranged to correspond to the area having no color filter.

5. The liquid crystal display according to claim 4, at least one of the color filters having a thickness substantially equal to a thickness of the layer.

6. A liquid crystal display, comprising:

a first electrode;

a second electrode opposing the first electrode;

a plurality of dots formed at overlapping portions of the first electrode and the second electrode, the plurality of dots further comprising a first group of dots and a second group of dots; and

a plurality of color filters, a color filter being arranged to correspond to each dot of the first group, none of the color filters being arranged to correspond to any dot of the second group.

7. A liquid crystal display, comprising:

a first electrode;

a second electrode opposing the first electrode;

a plurality of dots formed in areas at overlapping portions of the first electrode and the second electrode; and

a plurality of color filters, a color filter being arranged to correspond to each of the plurality of dots, the color filter continuously extending beyond the area of each of the plurality of dots.

8. The liquid crystal display according to claim 7, no black mask being provided between each adjacent dot of the plurality of dots.

9. The liquid crystal display according to claim 7, individual dots of the plurality of dots being associated with different color filters which display different colors and the different color filters associated with individual dots not overlapping.

10. The liquid crystal display according to claim 9, the different color filters associated with individual dots contacting one another in an area extending beyond an area of a dot.

11. The liquid crystal display according to claim 9, the different color filters associated with individual dots being arranged so as to be separated from one another.