Liquid crystal display device

• US 8,934,069 B2
• Filed: 04/14/2011
• Issued: 01/13/2015
• Est. Priority Date: 04/16/2010
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishizawa, Shigeki
• Primary Examiner(s): Glick, Edward
• Assistant Examiner(s): CHUNG, DAVID Y
• Application Number:
  US13/086,431
• Publication Number:
  US 20110255028A1
• Time in Patent Office: 1,370 Days
• Field of Search: 349 61- 65, 349/96, 349/110, 349/111
• US Class Current: 349/62
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element

Abstract

Provided is a liquid crystal display device which includes: a pair of transparent substrates which are arranged to face each other in an opposed manner with a liquid crystal layer sandwiched therebetween; a non-self-luminous display part having at least a light transmitting region which allows light to pass therethrough and a light shielding region which shields light; and a backlight part, wherein the transparent substrate arranged on a backlight part side includes a reflection film formed of a metal thin film in which an opening region corresponding to the light transmitting region is formed on a liquid crystal layer side of the transparent substrate on the backlight part side, and the backlight light incident on the opening region passes through the opening region, and the backlight light incident on a region where the reflection film is formed is reflected toward the backlight part side.

Claims

1. A liquid crystal display device comprising:

a pair of transparent substrates which are arranged to face each other in an opposed manner with a liquid crystal layer sandwiched therebetween;

a non-self-luminous display part having at least light transmitting regions which allow light to pass therethrough and a light shielding region which shields light; and

a backlight part which irradiates backlight light from a back surface side of the non-self-luminous display part;

wherein

the pair of transparent substrates comprises a first substrate which is arranged on a backlight part side and a second substrate which faces the first substrate,

the first substrate includes a reflection film formed of a metal thin film, the reflection film being formed on a liquid crystal layer side of the first substrate,

opening regions corresponding to the light transmitting regions are formed in the reflection film,

the backlight light which is incident on the opening region passes through the opening region and reaches the liquid crystal layer side, and the backlight light which is incident on a region where the reflection film is formed is reflected toward the backlight part side, and

the first substrate has polarization members for reflecting or absorbing an S-wave component of the backlight light and for allowing the transmission of a P-wave component therethrough in the opening regions, the polarization members being respectively arranged inside of the opening regions so as not to overlap the reflection film.

2. The liquid crystal display device according to claim 1, wherein the opening regions where the polarizer members are formed and the region where the reflection film is formed are formed alternately and adjacent to each other.

3. The liquid crystal display device according to claim 1, wherein the polarization members include a plurality of columnar bodies which are formed using a non-transmitting thin film material and have a predetermined thickness, and the columnar bodies are formed at predetermined intervals by in-print printing.

4. The liquid crystal display device according to claim 1, wherein at least one of a silicon-oxide based protective film and a silicon-nitride based protective film is provided between the first substrate and the reflection film.

5. The liquid crystal display device according to claim 1, wherein the reflection film is fixed to a predetermined potential.

6. The liquid crystal display device according to claim 1, wherein the reflection film is directly formed over a liquid-crystal-layer-side surface of the first substrate.

7. The liquid crystal display device according to claim 1, wherein the first substrate includes a plurality of drain lines and a plurality of gate lines intersecting the drain lines and define regions surrounded by the drain lines and the gate lines as regions of pixels, and the second substrate has color filters of red, green and blue corresponding to regions of the pixels formed thereon.

8. The liquid crystal display device according to claim 1, wherein the first substrate has wire grid polarization members in the opening regions, and

the wire grid polarizers have a polarization function.