Liquid crystal display device

• US 7,019,800 B2
• Filed: 12/06/2002
• Issued: 03/28/2006
• Est. Priority Date: 07/26/2002
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Optoelectronics (InnoLux Corporation)
• Inventors: Kuo, Chen Lung
• Primary Examiner(s): Nguyen, Dung T.
• Assistant Examiner(s): Duong, Thoi V.
• Application Number:
  US10/310,860
• Publication Number:
  US 20040017526A1
• Time in Patent Office: 1,208 Days
• Field of Search: 349/110, 349/96, 349/153, 349/178, 349/179, 349/93, 349/190
• US Class Current: 349/110
• 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

A liquid crystal display device mainly includes a first substrate having a light-shielding matrix formed thereon, a second substrate, and a liquid crystal layer sandwiched between the first and the second substrates. The first substrate is attached to the second substrate by a light-cured sealant. The present invention is characterized in that the light-shielding matrix has at least one transparent area located at a position facing the interface between the light-cured sealant and the liquid crystal layer thereby allowing a radiation entering the liquid crystal display device from the first substrate to reach the light-cured sealant through the at least one transparent area of the light-shielding matrix.

Claims

1. A liquid crystal display device, comprising:

a first substrate;

a second substrate;

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

a light-cured sealant for attaching the first substrate to the second substrate; and

a light-shielding matrix formed on the first substrate,

wherein the light-shielding matrix includes a slit extending along the interface between the light-cured sealant and the liquid crystal layer thereby allowing a radiation entering the liquid crystal display device from the first substrate to reach the light-cured sealant through slit, wherein the slit overlaps with only a portion of the light-cured sealant and exposes the interface between the light-cured sealant and the liquid crystal layer.

2. The liquid crystal display device as claimed in claim 1, wherein the second substrate further comprises an opaque pattern formed at a position facing the slit.

3. The liquid crystal display device as claimed in claim 2, wherein the opaque pattern comprises an anti-reflection surface layer facing the first substrate.

4. The liquid crystal display device as claimed in claim 3, wherein the anti-reflection surface layer is made of refractory metal.

5. The liquid crystal display device as claimed in claim 4, wherein the refractory metal comprises a metal selected from the group consisting of Cr, Ta, Mo, and Ti.

6. The liquid crystal display device as claimed in claim 3, wherein the anti-reflection surface layer is an oxidized metal film.

7. The liquid crystal display device as claimed in claim 1, wherein the light-cured sealant is a UV cured sealant.

8. The liquid crystal display device as claimed in claim 1, wherein the light-shielding matrix is a black matrix.

9. The liquid crystal display device as claimed in claim 1, wherein the liquid crystal display device is a normally black mode liquid crystal display device comprising a pair of polarizers attached on the first and the second substrates respectively in a manner that the polarizers on the first and the second substrates cover areas on the first and the second substrates facing the slit.

10. The liquid crystal display device as claimed in claim 9, wherein the liquid crystal layer comprises a vertically aligned liquid crystal having a negative dielectric constant anisotropy, and the polarization axes of the pair of polarizers are perpendicular to each other.

11. The liquid crystal display device as claimed in claim 9, wherein the liquid crystal layer comprises a horizontally 90 degree twisted nematic liquid crystal having a positive dielectric constant anisotropy, and the polarization axes of the pair of polarizers are parallel to each other.