Liquid crystal display panel

• US 20020145688A1
• Filed: 04/06/2001
• Published: 10/10/2002
• Est. Priority Date: 04/06/2001
• Status: Active Grant

• Current Assignee: Citizen Holdings Co., Ltd.
• Original Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Inventors: Sekiguchi, Kanetaka
• Granted Patent: US 6,690,438 B2
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A liquid crystal layer (15) is sandwiched between a first substrate (1) provided on a visible side and a second substrate (5) opposed to the first substrate; a first color filter (9) is provided on the first substrate (1) or on the second substrate (5); a transflective reflector (24) is provided on the opposite side to the visible side of the first color filter (9), which transmits a part of light and reflecting almost all the remaining light; and a second color filter (28) is provided on the opposite side to the first color filter (9) with respect to the transflective reflector (24), thereby forming a liquid crystal display panel.

Claims

1. A liquid crystal display panel, comprising:

a first substrate provided on a visible side;

a second substrate opposed to said first substrate;

a liquid crystal layer sandwiched between said first substrate and said second substrate;

a first color filter provided on said first substrate or on said second substrate;

a transflective reflector, provided on an opposite side to said visible side of said first color filter, for transmitting a part of light and reflecting almost all remaining light; and

a second color filter provided on an opposite side to said first color filter with respect to said transflective reflector.

2. A liquid crystal display panel according to claim 1,

wherein said transfiective reflector has a transmitting hole portion with a high transmittance and a reflecting portion with a high reflectance.

3. A liquid crystal display panel according to claim 2, further comprising:

signal electrodes provided on said first substrate; and

opposed electrodes provided on said second substrate to form pixel portions where said signal electrodes and said opposed electrodes coincide as viewed in a plane view,

wherein said transmitting hole portion of said transfiective reflector is provided inside said pixel portion.

4. A liquid crystal display panel according to claim 3,

wherein said second color filter is constituted of filters of a plurality of colors and overlapping portions where said filters of adjacent colors overlap one upon another are provided between said pixel portions.

5. A liquid crystal display panel according to claim 4,

wherein said first color filter is also constituted of filters of a plurality of colors and overlapping portions where said filters of adjacent colors overlap one upon another are provided between said pixel portions.

6. A liquid crystal display panel according to claim 1, further comprising:

signal electrodes provided on said first substrate;

opposed electrodes provided on said second substrate to form pixel portions where said signal electrodes and said opposed electrodes coincide as viewed in a plane view; and

a transflective reflector removed portion without providing said transfiective reflector provided around a display region constituted of a plurality of said pixel portions.

7. A liquid crystal display panel according to claim 6,

wherein said first color filter and said second color filter are constituted of filters of a plurality of colors respectively, and

wherein said filters of different colors are arranged in said first color filter and said second color filter within a region of said transflective reflector removed portion.

8. A liquid crystal display panel according to claim 6,

wherein said second color filter is constituted of filters of a plurality of colors, and

wherein said second color filter is formed by laminating said filters of a plurality of different colors within a region of said transfiective reflector removed portion.

9. A liquid crystal display panel according to claim 6, further comprising:

a light shielding member having a reflectance lower than that of said transfiective reflector and a light shielding property provided on said first substrate or on said second substrate within a region of said transflective reflector removed portion.

10. A liquid crystal display panel according to claim 1,

wherein said transfiective reflector has irregularities on a front face thereof and a light diffusing property.

11. A liquid crystal display panel according to claim 1,

wherein said transflective reflector is provided on a surface on said visible side of said second substrate.

12. A liquid crystal display panel according to claim 1,

wherein said second color filter and said transfiective reflector are provided on a surface on said visible side of said second substrate in an order of said second color filter and said transflective reflector from said second substrate side.

13. A liquid crystal display panel according to claim 1,

wherein said transflective reflector is provided on an opposite side to said visible side of said second substrate, and said second color filter is provided on an opposite side to said second substrate with respect to said transflective reflector.

14. A liquid crystal display panel according to claim 13,

wherein said second color filter is provided contacting a surface on an opposite side to said visible side of said transfiective reflector.

15. A liquid crystal display panel according to claim 1,

wherein said first color filter and said second color filter have substantially same pixel pitch.

16. A liquid crystal display panel according to claim 15,

wherein said first color filter and said second color filter are constituted of filters of a plurality of colors respectively, so that said filters of same color are arranged to coincide as viewed in a plane view in each pixel.

17. A liquid crystal display panel according to claim 1, further comprising:

signal electrodes provided on said first substrate; and

opposed electrodes provided on said second substrate to form pixel portions where said signal electrodes and said opposed electrodes coincide as viewed in a plane view,

wherein said transflective reflector is disposed on an opposite side to said visible side of said second substrate,

said first color filter and said second color filter are provided at positions corresponding to said pixel portions respectively,

said first color filter is constituted of filters of a plurality of colors which are different in color at portions corresponding to adjacent pixel portions, and

said second color filter is provided with a light shielding layer at positions corresponding to gaps between adjacent pixel portions.

18. A liquid crystal display panel according to claim 1,

wherein said transfiective reflector has an optical polarizing property.

19. A liquid crystal display panel according to claim 1,

wherein said first color filter and said second color filter have aligning marks respectively.

20. A liquid crystal display panel according to claim 1, further comprising:

signal electrodes provided on said first substrate;

opposed electrodes provided on said second substrate to form pixel portions where said signal electrodes and said opposed electrodes coincide as viewed in a plane view;

a first polarizer provided on said visible side of said first substrate;

a second polarizer provided on an opposite side to said visible side of said second substrate; and

a white diffuser provided between said first substrate and said first polarizer,

wherein said first color filter is constituted of filters of a plurality of colors corresponding to said pixel portions, and

said transflective reflector is disposed on an opposite side to said visible side of said second substrate.

21. A liquid crystal display panel according to claim 1,

further comprising switching elements provided on said liquid crystal layer side of said second substrate,

wherein said switching element and said transflective reflector are connected.

22. A liquid crystal display panel according to claim 1,

wherein said liquid crystal layer is constituted of a scattering liquid crystal.

23. A liquid crystal display panel according to claim 22,

further comprising an ultraviolet cut film on said visible side of said first substrate, for absorbing or reflecting ultraviolet light.

24. A liquid crystal display panel according to claim 22,

wherein said second substrate is a transparent plastic substrate or plastic film substrate.