Liquid crystal display device

• US 9,618,793 B2
• Filed: 08/02/2013
• Issued: 04/11/2017
• Est. Priority Date: 03/28/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Nam, Jung-Gun, Han, Kyoung-Tai, Lee, Dae-Young, Jang, Dae-Hwan, Jo, Gug-Rae, Takakuwa, Atsushi
• Primary Examiner(s): Lee, Paul
• Assistant Examiner(s): Pan, Jia
• Application Number:
  US13/958,059
• Publication Number:
  US 20140293187A1
• Time in Patent Office: 1,348 Days
• Field of Search: 349 96, 349 42, 349 43, 349 62, 359483, 35948301, 35948505, 359352
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133548 Wire-grid polarisers
• CPC Class Codes: G02F 1/13362 providing polarized light, e.g. by converting a polarisation component into another one

Abstract

A liquid crystal display device includes a liquid crystal display panel and a backlight unit providing light to the liquid crystal display panel. The liquid crystal display panel includes a first substrate on which a thin film transistor is disposed, a second substrate facing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a first polarizer disposed on the second substrate having a plurality of metal patterns spaced apart from each other by an interval. The backlight unit faces the second substrate.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display panel comprising;

a first substrate;

a thin film transistor disposed on the first substrate;

a second substrate facing the first substrate;

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

a first polarizer disposed on the second substrate, the first polarizer comprising metal patterns spaced apart from each other by an interval;

a planar pattern disposed on the second substrate and overlapping the thin film transistor; and

a backlight unit configured to provide light to the liquid crystal display panel, the backlight unit facing the second substrate,

wherein;

the second substrate is disposed between the liquid crystal layer and the backlight unit;

the first polarizer is spaced apart from the thin film transistor in a horizontal direction in a plan view;

the thin film transistor comprises a gate electrode, a semiconductor pattern, a source electrode, and a drain electrode;

the semiconductor pattern partially overlaps the source electrode and the drain electrode;

the gate electrode is disposed between the semiconductor pattern and the planar pattern;

the planar pattern is disposed on the same surface of the second substrate as the first polarizer; and

the planar pattern and the first polarizer are disposed between the second substrate and the backlight unit.

2. The liquid crystal display device of claim 1, wherein the interval of the metal patterns is substantially no greater than a wavelength of visible light.

3. The liquid crystal display device of claim 1, wherein the liquid crystal display panel further comprises a color filter disposed on the second substrate.

4. The liquid crystal display device of claim 1, wherein the liquid crystal display panel further comprises a passivation layer covering the first polarizer.

5. The liquid crystal display device of claim 1, wherein the liquid crystal display panel further comprises a second polarizer disposed on the first substrate, the second polarizer comprising metal patterns spaced apart from each other by an interval.

6. The liquid crystal display device of claim 1, wherein the second polarizer has a lower reflectivity than the first polarizer.

7. The liquid crystal display device of claim 1, wherein the liquid crystal display panel further comprises a light absorption polarizer disposed on the first substrate.

8. The liquid crystal display device of claim 1, wherein the liquid crystal display panel further comprises:

a pixel electrode disposed on the first substrate and electrically connected to the thin film transistor; and

a common electrode disposed on the second substrate.

9. A liquid crystal display device comprising:

a liquid crystal display panel comprising an array substrate, a liquid crystal layer, and a facing substrate, the array substrate comprising;

a transparent substrate;

a polarizer disposed on a first surface of the transparent substrate, the polarizer having metal patterns spaced apart from each other by an interval;

a passivation layer covering the polarizer;

a thin film transistor disposed on the passivation layer, the thin film transistor being spaced apart from the polarizer in a horizontal direction; and

a planar pattern disposed on a second surface of the transparent substrate, the second surface being disposed opposite the first surface, the planar pattern overlapping the thin film transistor and not overlapping the polarizer; and

a backlight unit configured to provide light to the liquid crystal display panel,

wherein the planar pattern and the polarizer comprise substantially the same material.

10. The liquid crystal display device of claim 9, wherein the facing substrate comprises a light blocking pattern overlapping the thin film transistor.

11. A liquid crystal display device comprising:

a liquid crystal display panel comprising an array substrate, a liquid crystal layer, and a facing substrate, the array substrate comprising;

a transparent substrate;

a polarizer disposed on a first surface of the transparent substrate, the polarizer having metal patterns spaced apart from each other by an interval;

a passivation layer covering the polarizer;

a thin film transistor disposed on the passivation layer, the thin film transistor being spaced apart from the polarizer in a horizontal direction; and

a planar pattern disposed on a second surface of the transparent substrate, the second surface being disposed opposite the first surface, the planar pattern overlapping the thin film transistor and not overlapping the polarizer; and

a backlight unit configured to provide light to the liquid crystal display panel,

wherein the planar pattern comprises a multi-layered structure comprising a plurality of layers of stacked metallic materials.