Liquid crystal display device

• US 7,142,272 B2
• Filed: 10/26/2004
• Issued: 11/28/2006
• Est. Priority Date: 10/02/2001
• 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: Narutaki, Yozo, Fujimori, Kohichi
• Primary Examiner(s): Ton, Toan
• Assistant Examiner(s): DUONG, TAI V
• Application Number:
  US10/972,426
• Publication Number:
  US 20050083457A1
• Time in Patent Office: 763 Days
• Field of Search: 349/64, 349/112, 349/113, 349/114, 349/106, 349/107
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• 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 2203/09 transflective

Abstract

The liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer interposed between the first and second substrates, and a plurality of picture-element regions for providing display. Each of the plurality of picture-element regions has a transmission region for providing display in a transmission mode by using light incident through the first substrate, and a reflection region for providing display in a reflection mode by using light incident through the second substrate. The second substrate has a color filter layer provided in the transmission region and the reflection region. The thickness of the color filter layer in at least a part of the reflection region is smaller than the thickness of the color filter layer in the transmission region.

Claims

1. A liquid crystal display device, comprising:

a first substrate;

a second substrate;

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

a plurality of picture-element regions for providing display,

wherein;

each of the plurality of picture-element regions has a transmission region for providing display in a transmission mode by using light incident through the first substrate, and a reflection region for providing display in a reflection mode by using light incident through the second substrate,

the second substrate comprises a transparent substrate and a color filter layer provided in the transmission region and the reflection region,

a thickness of the color filter layer in at least a part of the reflection region is smaller than a thickness of the color filter layer in the transmission region,

at least in the reflection region of one or more of the picture-element regions, the second substrate includes a plurality of spaced apart transparent dielectric layers between the transparent substrate and the color filter layer, and

the plurality of transparent dielectric layers have a light-diffusing function.

2. The liquid crystal display device according to claim 1, wherein the plurality of transparent dielectric layers include a transparent matrix material and a filler which is dispersed in the transparent matrix material and has a refractive index different from that of the transparent matrix material.

3. A liquid crystal display device, comprising:

a first substrate;

a second substrate;

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

a plurality of picture-element regions for providing display,

wherein;

at least one of the picture-element regions comprises a transmission region for providing display in a transmission mode by using light incident through the first substrate, and a reflection region for providing display in a reflection mode by using light incident through the second substrate,

the second substrate comprises a color filter layer provided in the transmission region and the reflection region,

a thickness of the color filter layer in at least a part of the reflection region is smaller than a thickness of the color filter layer in the transmission region,

the second substrate further includes a transparent substrate, and at least one transparent dielectric layer formed between the transparent substrate and the color filter layer in at least the part of the reflection region, and

the transparent dielectric layer includes a transparent matrix material and a filler which is dispersed in the transparent matrix material and has a refractive index different from that of the transparent matrix material, and has a light-diffusing function.