Liquid crystal display and method of manufacturing the same

• US 9,880,411 B2
• Filed: 11/28/2012
• Issued: 01/30/2018
• Est. Priority Date: 06/29/2012
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Seo, Seung Mi, Jung, Suk Won
• Primary Examiner(s): Glick, Edward
• Assistant Examiner(s): CHUNG, DAVID Y
• Application Number:
  US13/687,542
• Publication Number:
  US 20140002764A1
• Time in Patent Office: 1,889 Days
• Field of Search: 349 86, 349139, 349141
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• 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: G02F 1/136231 for reducing the number of lithographic steps
• CPC Class Codes: H01L 33/0041 characterised by field-effect operation

Abstract

A display device includes a substrate, a thin film transistor disposed on the substrate, where the thin film transistor includes a drain electrode, a passivation layer disposed on the substrate covering the thin film transistor, a common electrode disposed on the passivation layer, where the common electrode receives a common voltage, a liquid crystal layer disposed in a microcavity layer on the common electrode, a roof layer disposed covering the liquid crystal layer, and a pixel electrode disposed on the roof layer, and a method of manufacturing the display device is provided.

Claims

1. A display device comprising:

a substrate;

a thin film transistor disposed on the substrate, wherein the thin film transistor comprises a drain electrode;

a passivation layer disposed on the substrate covering the thin film transistor;

a common electrode disposed on the passivation layer, wherein the common electrode receives a common voltage;

a liquid crystal layer disposed in a microcavity layer on the common electrode;

a roof layer disposed covering the liquid crystal layer; and

a pixel electrode disposed on the roof layer,

wherein

a first opening is defined in a portion of the roof layer, the first opening overlapping the liquid crystal layer in a direction substantially perpendicular to the substrate and being disposed above the liquid crystal layer at a pixel electrode region, in which the pixel electrode is disposed,

a second opening is defined in the roof layer at a drain electrode exposing region, through which the drain electrode of the thin film transistor is exposed, and

a connection opening, which connects the first opening and the second opening, is defined in the roof layer.

2. The display device of claim 1, wherein

the pixel electrode is disposed in a region on the first opening, the second opening, and the connection opening.

3. The display device of claim 1, wherein

a side of the common electrode is substantially aligned with a corresponding side of the microcavity layer.

4. The display device of claim 3, wherein

the side of the common electrode extends in an extension direction of the common electrode.

5. The display device of claim 3, wherein

the common electrode is not disposed on a drain electrode exposing region, through which the drain electrode of the thin film transistor is exposed.

6. The display device of claim 1, further comprising:

a color filter disposed between the passivation layer and the common electrode; and

a light blocking member disposed between the passivation layer and the common electrode.

7. The display device of claim 1, wherein

a portion of the pixel electrode is disposed in the first opening.