Liquid crystal display device and fabricating method thereof

• US 9,274,390 B2
• Filed: 07/25/2002
• Issued: 03/01/2016
• Est. Priority Date: 07/25/2001
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Chang, Youn-Gyoung, Kim, Woong-Kwon
• Primary Examiner(s): Rude, Timothy L
• Application Number:
  US10/201,922
• Publication Number:
  US 20030020852A1
• Time in Patent Office: 4,968 Days
• Field of Search: 349/106, 349/44
• US Class Current: 1/1
• 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
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio

Abstract

A liquid crystal display device includes first and second substrates facing into each other, a gate line and a data line on an inner surface of the first substrate, the gate line and the data line defining a pixel region, a thin film transistor connected to the gate line and the data line, a pixel electrode connected to the thin film transistor and disposed at the pixel region, a color filter layer disposed closer than the pixel electrode from the first substrate, the color filter layer corresponding to the pixel electrode, a black matrix over the thin film transistor, a common electrode on an inner surface of the second substrate, and a liquid crystal layer interposed between the pixel electrode and the common electrode.

Claims

1. A liquid crystal display device, comprising:

first and second substrates facing into each other;

a gate line and a data line on an inner surface of the first substrate, the gate line and the data line defining a pixel region;

a thin film transistor connected to the gate line and the data line;

a passivation layer of an organic material directly on the film transistor, wherein the passivation layer has a contact hole exposing the thin film transistor;

a pixel electrode connected to the thin film transistor through the contact hole and disposed at the pixel region, wherein the pixel electrode is formed directly on the passivation layer;

a color filter layer disposed closer than the pixel electrode from the first substrate, the color filter layer corresponding to the pixel electrode and the pixel region, wherein two adjacent color filter layers in two adjacent pixel regions are spaced apart from each other to define a gap with the first substrate;

an overcoat layer on the color filter layer that protects and planarizes the color filter layer, wherein the gap is filled with the overcoat layer such that a step generated by the gap is eliminated, and wherein a top surface of the overcoat layer is flat without a through hole;

a black matrix over the thin film transistor, wherein the black matrix includes a conductive metallic material, wherein the black matrix is formed directly on the passivation layer;

a common electrode on an inner surface of the second substrate; and

a liquid crystal layer interposed between the pixel electrode and the common electrode,

wherein the pixel electrode covers the entire black matrix to sandwich the black matrix between the pixel electrode and the thin film transistor and is electrically connected to the entire black matrix and wherein the color filter layer is formed under the thin film transistor.

2. The device according to claim 1, wherein the color filter layer has three colors of red, green, and blue.

3. The device according to claim 1, wherein the black matrix is formed of one of chromium, molybdenum, and titanium.

4. The device according to claim 1, wherein the pixel electrode directly contacts the black matrix.

5. The device according to claim 1, wherein the color filter layer overlaps with the thin film transistor.

6. The device according to claim 1, wherein the color filter layer is directly below the thin film transistor.

7. The device according to claim 1, wherein the black matrix is between the passivation layer and the second substrate.

8. A liquid crystal display device, comprising:

first and second substrates facing each other;

a color filter layer on the first substrate;

an overcoat layer on the color filter layer;

a thin film transistor on the overcoat layer;

a passivation layer directly on the thin film transistor, the passivation layer having a contact hole exposing the thin film transistor;

a black matrix directly on the passivation layer and over the thin film transistor;

a pixel electrode directly on the passivation layer and connected to the thin film transistor through the contact hole;

a common electrode on the second substrate; and

a liquid crystal layer interposed between the pixel electrode and the common electrode, wherein the thin film transistor and is between the color filter layer and the black matrix.

9. The device according to claim 8, wherein the thin film transistor is over the color filter layer.

10. The device according to claim 8, wherein the black matrix is between the passivation layer and the second substrate.