LIQUID CRYSTAL DISPLAY DEVICE

• US 20110255028A1
• Filed: 04/14/2011
• Published: 10/20/2011
• 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
• Inventors: NISHIZAWA, Shigeki
• Granted Patent: US 8,934,069 B2
• Time in Patent Office: Days
• 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 a light transmitting region which allows 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

out of the pair of transparent substrates, the transparent substrate which is 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 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.

2. 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 transparent substrate on the backlight part side and the reflection film.

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

4. The liquid crystal display device according to claim 1, wherein the transparent substrate which is arranged on the backlight part side has a polarization function of reflecting or absorbing an S-wave component of the backlight light and allowing the transmission of a P-wave component therethrough in the opening region.

5. The liquid crystal display device according to claim 4, wherein a polarizer is formed in the opening region of the reflection film, and the region where the polarizer is formed and the region where the reflection film is formed are formed alternately and adjacent to each other.

6. The liquid crystal display device according to claim 4, wherein the polarizer includes 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.

7. 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 transparent substrate arranged on the backlight part side.

8. The liquid crystal display device according to claim 1, wherein the pair of transparent substrates are constituted of a first substrate which 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 a second substrate on which color filters of red, green and blue corresponding to regions of the pixels are formed, wherein the first substrate is arranged on the backlight part side.