Liquid crystal display device

• US 20040263727A1
• Filed: 05/27/2004
• Published: 12/30/2004
• Est. Priority Date: 06/04/2003
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Noguchi, Koji
• Granted Patent: US 7,345,720 B2
• Time in Patent Office: Days
• US Class Current: 349/113
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A transflective liquid crystal display device, improved in luminance and contrast to improve the viewability and the color reproducibility in color display better, having scattering diffusion reflectors formed at a first transparent substrate and a transparent window formed at the first transparent substrate surrounding the diffusion reflectors in an unevenness distribution. Since the easily regular reflecting regions around the diffusion reflectors are formed with the transparent window, both the reflectance of diffused and reflected front light and the transmittance of back light can be improved.

Claims

1. A liquid crystal display device comprising:

a first transparent substrate;

a second transparent substrate facing and arranged to said first transparent substrate; and

a liquid crystal layer arranged between said first transparent substrate and said second transparent substrate;

in said first transparent substrate, a plurality of diffusion reflectors for diffusing and reflecting front light incident from said second transparent substrate side via said liquid crystal layer being formed in an unevenness distribution and a transparent window for passing light surrounding said diffusion reflectors being formed.

2. A liquid crystal display device as set forth in claim 1, wherein a first distance of said liquid crystal layer between said second transparent substrate and said diffusion reflectors is smaller than a second distance of said liquid crystal layer between said second transparent substrate and said transparent window.

3. A liquid crystal display device as set forth in claim 1, wherein said first distance is a half of said second distance.

4. A liquid crystal display device as set forth in claim 1, wherein said diffusion reflectors are formed at parts with diffusion reflection apertures so as to pass light.

5. A liquid crystal display device as set forth in claim 1, further comprising:

a first color filter formed at said first transparent substrate and passing back light incident from a direction facing said front light and

a second color filter formed at said second transparent substrate and passing light.

6. A liquid crystal display device as set forth in claim 1, further comprising:

a color filter formed at said second transparent substrate and passing light;

said color filter being formed with color filter apertures formed so as to pass light at positions facing said diffusion reflectors.