Liquid crystal display device and method of manufacturing liquid crystal display device with color filter layer on thin film transistor

• US 7,612,373 B2
• Filed: 06/29/2005
• Issued: 11/03/2009
• Est. Priority Date: 06/30/2004
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Jong-Jin
• Primary Examiner(s): Parker; Kenneth A
• Assistant Examiner(s): Ho; Anthony
• Application Number:
  US11/169,021
• Publication Number:
  US 20060006385A1
• Time in Patent Office: 1,588 Days
• Field of Search: 257/59, 257/72
• US Class Current: 257/59
• CPC Class Codes: G02F 1/13458 Terminal pads
• 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 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1288 employing particular masking sequences or specially adapted masks, e.g. half-tone mask

Abstract

A method of fabricating a liquid crystal display device is provided. The method of fabricating a liquid crystal display device includes forming a thin film transistor including a source electrode and a drain electrode on a substrate, forming a first passivation layer on the substrate, forming a black matrix on the first passivation layer, forming a color filter layer on the first passivation layer in the pixel region, and forming a pixel electrode above the color filter layer and the black matrix by using a single mask.

Claims

1. A liquid crystal display device, comprising:

a substrate;

a gate line and a gate electrode on the substrate;

a gate insulating layer on the gate line and the gate electrode;

an active layer on the gate insulating layer over the gate electrode;

an ohmic contact layer on the active layer;

a source electrode, a drain electrode and a data line on the ohmic contact layer, the data line crossing the gate line to define a pixel region;

a first passivation layer on the source and drain electrodes and the data line;

a black matrix on the first passivation layer over the active layer;

a color filter layer on the first passivation layer in the pixel region;

a second passivation layer on the black matrix and the color filter layer, the second passivation layer exposing the color filter layer in the pixel region; and

a pixel electrode on the exposed color filter layer in the pixel region, the pixel electrode connected to the drain electrode, wherein the pixel electrode is disposed in a region excluding the second passivation layer such that the pixel electrode does not overlap the second passivation layer.

2. The device according to claim 1, wherein the pixel electrode is disposed on a same layer as the second passivation layer.

3. The device according to claim 1, further comprising a columnar spacer over the gate and data lines.

4. The device according to claim 1, wherein the second passivation layer is selectively patterned in the pixel region and selectively exposes the color filter layer.

5. The device according to claim 4, further comprising a common electrode on the selectively exposed color filter layer in the pixel region, the common electrode spaced apart from and coplanar with the pixel electrode.