Liquid crystal display device and display equipment using the same

• US 20060164576A1
• Filed: 11/23/2005
• Published: 07/27/2006
• Est. Priority Date: 11/26/2004
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Aoki, Kengou
• Granted Patent: US 7,388,635 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 reflectable metal film having a light transmission hole 5 is formed on an inner surface of a transparent substrate 2, and a light transmission region 7 and a light reflection region 8 are arranged within each of pixel regions on the inner surface of the transparent substrate 2. A first color filter 9 and a second color filter 10 of a similar color that differs in tone are formed in each of the pixel regions. A boundary 11 between the first color filter 9 and the second color filter 10 in each of the pixel regions is positioned in the light reflection region 8 in the pixel region.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal display element in which a pair of transparent substrates, each having at least a display electrode and an orientation film positioned such that the display electrodes are opposed to each other, are arranged, and a liquid crystal layer is interposed between the transparent substrates such that a plurality of pixel regions are formed; and

a backlight arranged outside thereof so as to irradiate a display region of the liquid crystal display element, wherein

a reflectable metal film having a light transmission hole is formed on an inner surface or inner surfaces of one and/or the other of the transparent substrates,

a light transmission region for transmitting light from the backlight through the light transmission hole and a light reflection region for reflecting outside light other than the light from the backlight on the metal film are arranged within the single pixel region,

a first color filter and a second color filter of similar colors that differ in tone are formed in each of the pixel regions on the inner surface or inner surfaces of the one and/or the other of the transparent substrates, and

a boundary between the first color filter and the second color filter in each of the pixel regions is positioned in the light reflection region of the pixel region.

2. The liquid crystal display device according to claim 1, wherein

the first color filter in the dark color is formed in a region including the light transmission region of the pixel region, and

the second color filter in the light color is only formed in the light reflection region of the pixel region.

4. The liquid crystal display device according to claim 1, wherein

the boundary between the first color filter and the second color filter is composed of a boundary gap where no color filter exists.

5. The liquid crystal display device according to claim 1, wherein

a step exists in the boundary between the first color filter and the second color filter.

6. The liquid crystal display device according to claim 1, wherein

either one of the first color filter and the second color filter rises in the boundary.

3. The liquid crystal display device, wherein the difference in tone between the colors is represented by respective wavelength distributions of light transmission factors of the color filters.

7. Display equipment comprising a liquid crystal display device, driving means for feeding a predetermined signal to a display electrode of the liquid crystal display device, and a predetermined circuit for feeding the predetermined signal to the driving means, wherein

the liquid crystal display device comprises:

a liquid crystal display element in which a pair of transparent substrates, each having at least a display electrode and an orientation film positioned such that the display electrodes are opposed to each other, are arranged, and a liquid crystal layer is interposed between the transparent substrates such that a plurality of pixel regions are formed; and

a backlight arranged outside thereof so as to irradiate a display region of the liquid crystal display element,

a reflectable metal film having a light transmission hole is formed on an inner surface or inner surfaces of one and/or the other of the transparent substrates,

a light transmission region for transmitting light from the backlight through the light transmission hole and a light reflection region for reflecting outside light other than the light from the backlight on the metal film are arranged within the single pixel region,

a first color filter and a second color filter of a similar color that differ in tone are formed in each of the pixel regions on the inner surface or inner surfaces of the one or/and the other of the transparent substrates, and

a boundary between the first color filter and the second color filter in each of the pixel regions is positioned in the light reflection region of the pixel region.