Liquid crystal display and manufacturing method thereof

• US 9,086,587 B2
• Filed: 03/14/2013
• Issued: 07/21/2015
• Est. Priority Date: 11/01/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Gyung-Soon, Kim, Il Gon
• Primary Examiner(s): Kim, Dennis Y
• Application Number:
  US13/828,385
• Publication Number:
  US 20140118673A1
• Time in Patent Office: 859 Days
• Field of Search: 349/138
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• 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 2201/40 Arrangements for improving the aperture ratio

Abstract

In a liquid crystal display (LCD), a thickness of a passivation layer overlapping signal lines is larger than a thickness of portion of the passivation layer not overlapping signal lines. A spacer may be formed to overlap the signal lines. In an aperture region of the LCD, a thickness of the passivation layer between a common electrode and a pixel electrode is relatively small, and therefore, it may be possible to prevent reduction in the intensity of the electric field between the common electrode and the pixel electrode. Since thickness of the passivation layer may be relatively large, it may be possible to prevent a signal delay of common voltage. A spacer may be formed overlapping signal lines with relatively thick passivation layer. The spacer may have a small height. Cell gap may be adjusted to be uniform, and prevent reduction in aperture ratio of the LCD.

Claims

1. A liquid crystal display, comprising:

a first substrate;

a first field generating electrode and a second field generating electrode disposed on the first substrate, the first field generating electrode overlapping the second field generating electrode;

an insulating layer disposed between the first field generating electrode and the second field generating electrode;

a first signal line and a second signal line disposed on the first substrate, the first signal line and the second signal line being connected to the first field generating electrode; and

a gate insulating layer disposed between the first signal line and the second signal line,

wherein;

the insulating layer comprises a passivation layer disposed between the second signal line and the second field generating electrode;

the passivation layer comprises a first portion overlapping the first signal line and the second signal line and a second portion not overlapping the first signal line and the second signal line;

a thickness of the first portion is larger than a thickness of the second portion; and

the first field generating electrode is disposed between the first substrate and the gate insulating layer.

2. The liquid crystal display of claim 1, wherein:

the first portion of the passivation layer comprises a first passivation layer and a second passivation layer disposed on the first passivation layer, and

the second portion of the passivation layer comprises the first passivation layer.

3. The liquid crystal display of claim 2, wherein:

the first passivation layer and the second passivation layer have different etching rates.

4. The liquid crystal display of claim 3, further comprising:

a second substrate facing the first substrate; and

a spacer disposed between the first substrate and the second substrate,

wherein the spacer overlaps the first portion of the passivation layer.

5. The liquid crystal display of claim 1, further comprising:

a second substrate facing the first substrate; and

a spacer disposed between the first substrate and the second substrate,

wherein the spacer overlaps the first portion of the passivation layer.