Transmission/reflection type color liquid crystal display device

• US 6,501,521 B2
• Filed: 03/07/2002
• Issued: 12/31/2002
• Est. Priority Date: 03/07/2001
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Sakuwa, Tohru, Matsushita, Tomohisa, Yoshimura, Kazuya
• Primary Examiner(s): Dudek, James A.
• Application Number:
  US10/092,421
• Publication Number:
  US 20020126238A1
• Time in Patent Office: 299 Days
• Field of Search: 349/113, 349/106, 349/107
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A liquid crystal display device, including: a first substrate; a second substrate; opposing the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate; a reflection film formed on one side of the second substrate that is closer to the liquid crystal layer; and a color filter formed on the reflection film, wherein: a plurality of pixel regions are arranged in a matrix pattern, each of the pixel regions including a reflection region where light coming from the first substrate side is reflected by the reflection film back to the first substrate side, and a transmission region where light coming from the second substrate side is transmitted to the first substrate side; and the color filter includes an opening in the reflection region.

Claims

1. A liquid crystal display device, comprising:

a first substrate;

a second substrate opposing the first substrate;

a liquid crystal layer interposed between the first substrate and the second substrate;

a reflection film formed on one side of the second substrate that is closer to the liquid crystal layer; and

a color filter formed on the reflection film, wherein;

a plurality of pixel regions are arranged in a matrix pattern, each of the pixel regions including a reflection region where light coming from the first substrate side is reflected by the reflection film back to the first substrate side, and a transmission region where light coming from the second substrate side is transmitted to the first substrate side; and

the color filter includes an opening in the reflection region.

2. The liquid crystal display device of claim 1, wherein the color filter includes a plurality of openings in the reflection region.

3. The liquid crystal display device of claim 1, wherein the reflection film is a diffused reflection film whose surface on the liquid crystal layer side has irregularities.

4. The liquid crystal display device of claim 1, wherein an area proportion of the transmission region with respect to the pixel region is equal to or greater than 10% and less than or equal to 50%, and an area proportion of the opening with respect to the reflection region is equal to or greater than 5% and less than or equal to 30%.

5. The liquid crystal display device of claim 1, wherein the openings of the color filter are filled with a transparent resin whose transmittance is 90% or more.

6. The liquid crystal display device of claim 1, wherein:

a plurality of picture element regions are defined, each including a number of the pixel regions of different colors; and

in each of the plurality of picture element regions, an area of the opening of the color filter in at least one of the pixel regions of different colors is smaller than an area of the opening of the color filter in each of the other pixel region(s).

7. The liquid crystal display device of claim 1, wherein:

the first substrate is a plastic substrate;

a plurality of picture element regions are defined, each including three of the pixel regions of red, green and blue; and

in each of the plurality of picture element regions, an area of the opening of the color filter in the blue pixel region is smaller than an area of the opening of the color filter in each of the red and green pixel regions.

8. The liquid crystal display device of claim 1, wherein:

a plurality of picture element regions are defined, each including a number of the pixel regions of different colors; and

in each of the plurality of picture element regions, an area of the transmission region in at least one of the pixel regions of different colors is greater than an area of the transmission region in each of the other pixel region(s).

9. The liquid crystal display device of claim 1, wherein:

at least one of the first substrate and the second substrate is a plastic substrate;

a plurality of picture element regions are defined, each including three of the pixel regions of red, green and blue; and

in each of the plurality of picture element regions, an area of the transmission region in the blue pixel region is greater than an area of the transmission region in each of the red and green pixel regions.

10. The liquid crystal display device of claim 1, wherein:

a plurality of picture element regions are defined, each including a number of the pixel regions of different colors; and

in each of the plurality of picture element regions, an area of the opening of the color filter in at least one of the pixel regions of different colors is smaller than an area of the opening of the color filter in each of the other pixel region(s), and an area of the transmission region in at least one of the pixel regions of different colors is greater than an area of the transmission region in each of the other pixel region(s).

11. The liquid crystal display device of claim 1, wherein:

at least one of the first substrate and the second substrate is a plastic substrate;

a plurality of picture element regions are defined, each including three of the pixel regions of red, green and blue; and

in each of the plurality of picture element regions, an area of the opening of the color filter in the blue pixel region is smaller than an area of the opening of the color filter in each of the red and green pixel regions, and an area of the transmission region in the blue pixel region is greater than an area of the transmission region in each of the red and green pixel regions.