LIQUID CRYSTAL DISPLAY PANEL, METHOD FOR MANUFACTURING LIQUID CRYSTAL DISPLAY PANEL, AND LIQUID CRYSTAL DISPLAY DEVICE

• US 20120140148A1
• Filed: 07/07/2010
• Published: 06/07/2012
• Est. Priority Date: 11/26/2009
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kadowaki, Shinya
• Application Number:
  US13/389,689
• Publication Number:
  US 20120140148A1
• Time in Patent Office: Days
• US Class Current: 349/64
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133548 Wire-grid polarisers

Abstract

A wire grid polarizer (WG) has (i) a region where linear conductive wires are regularly repeated at a constant pitch (P) and (ii) a region (A) where linear conductive wires are at a pitch larger than the constant pitch (P). The region (A) where the linear conductive wires are at a pitch larger than the constant pitch (P) and a black matrix (2b) included in a liquid crystal display panel are arranged so as to at least partially overlap each other when viewed from above. Accordingly, it is possible to suppress a reduction in display quality even in a case of employing a large-area wire grid polarizer (WG) which has a region where regularity of a pattern of linear conductive wires having a pitch smaller than a wavelength of light for use in a display is disturbed.

Claims

1. A liquid crystal display panel comprising:

a wire grid polarizer which has a pattern of linear conductive wires having a pitch smaller than a wavelength of light for use in a display; and

a light shielding layer,

the wire grid polarizer having (i) a first region where the linear conductive wires are regularly repeated at a constant pitch and (ii) a second region where the linear conductive wires are at a pitch larger than the constant pitch, and

the second region and the light shielding layer being arranged so as to at least partially overlap each other when viewed from above.

2. The liquid crystal display panel according to claim 1, wherein the light shielding layer is a black matrix.

3. The liquid crystal display panel according to claim 1, wherein the light shielding layer is a metal wire.

4. The liquid crystal display panel according to claim 1, further comprising two substrates between which a liquid crystal layer is held,

the wire grid polarizer being provided between the two substrates.

5. The liquid crystal display panel according to claim 1, further comprising a color control layer for emitting incident light as light of a plurality of colors, wherein:

the wire grid polarizer is provided on the color control layer; and

the constant pitch of the wire grid polarizer is configured to vary depending on a color of light that enters the wire grid polarizer through the color control layer so that a polarization extinction ratio is substantially identical, the polarization extinction ratio being a ratio of an amount of incident light to an amount of transmitted light when a polarization component parallel to the linear conductive wires enters the wire grid polarizer.

6. The liquid crystal display panel according to claim 5, wherein:

the color control layer includes a first color control layer for emitting incident light as red light, a second color control layer for emitting incident light as green light, and a third color control layer for emitting incident light as blue light;

the constant pitch of the wire grid polarizer on the first color control layer is configured to be a relatively large pitch;

the constant pitch of the wire grid polarizer on the third color control layer is configured to be a relatively small pitch; and

the constant pitch of the wire grid polarizer on the second color control layer is configured to be between the relatively large pitch and the relatively small pitch.

7. The liquid crystal display panel according to claim 5, wherein the color control layer is a colored layer or a phosphor layer.

8. A liquid crystal display device comprising:

a liquid crystal display panel recited in claim 1; and

a surface light source device for irradiating the liquid crystal display panel with light,

the surface light source device (i) having an irregularly-shaped light emitting surface for scattering light and/or (ii) having on its light emitting surface a diffusing member for scattering light.

9. A method for producing a liquid crystal display panel, the liquid crystal display panel including (i) a wire grid polarizer which has a pattern of linear conductive wires having a pitch smaller than a wavelength of light for use in a display and (ii) substrates, said method comprising the steps of:

(A) forming, on one of the substrates, a light shielding layer patterned into a predetermined shape;

(B) forming, evenly on an entire surface of said one of the substrates, a conductive film which is to be formed into the conductive wires;

(C) forming a resist so that the resist covers the conductive film;

(D) curing a part of the resist while pressing a patterned surface of a first mold against the part of the resist, the patterned surface being a surface in which linear patterns regularly repeated at a constant pitch smaller than the wavelength of the light are formed, to thereby form in the resist a first transferred surface on which the linear patterns in the patterned surface have been transferred;

(E) after relocating the first mold to a position adjacent to the first transferred surface, curing another part of the resist while pressing the patterned surface of the first mold against said another part of the resist to thereby form in the resist a second transferred surface on which the linear patterns in the patterned surface have been transferred;

in steps (D) and (E), locating the first mold such that a border between the first transferred surface and the second transferred surface at least partially overlaps the light shielding layer when viewed from above;

(F) etching the conductive film by using cured resist patterns as masks; and

(G) removing the cured resist patterns.

12. The method according to claim 9, wherein:

the resist is a photo-curing resist;

the first mold is made of a light-transmitting material; and

the photo-curing resist is cured by exposure to light.

14. The method according to claim 9, wherein:

the resist is a thermosetting resist; and

the thermosetting resist is cured by heat treatment.

10. A method for producing a liquid crystal display panel, the liquid crystal display panel including (i) a wire grid polarizer which has a pattern of linear conductive wires having a pitch smaller than a wavelength of light for use in a display and (ii) substrates, said method comprising the steps of:

(A) forming, on one of the substrates, a light shielding layer patterned into a predetermined shape;

(B) forming, evenly on an entire surface of said one of the substrates, a conductive film which is to be formed into the conductive wires;

(C) forming a resist so that the resist covers the conductive film;

(D) curing the resist while pressing a patterned surface of a second mold against the resist, the patterned surface of the second mold having (i) a first region in which linear patterns regularly repeated at a constant pitch smaller than the wavelength of the light are formed and (ii) a second region in which linear patterns are at a pitch larger than the constant pitch;

in step (D), locating the second mold such that the second region at least partially overlaps the light shielding layer when viewed from above;

(E) etching the conductive film by using cured resist patterns as masks; and

(F) removing the cured resist patterns.

13. The method according to claim 10, wherein:

the resist is a photo-curing resist;

the second mold is made of a light-transmitting material; and

the photo-curing resist is cured by exposure to light.

15. The method according to claim 10, wherein:

the resist is a thermosetting resist; and

the thermosetting resist is cured by heat treatment.

11. (canceled)