DISPLAY PANEL AND DISPLAY DEVICE

• US 20120013839A1
• Filed: 11/12/2009
• Published: 01/19/2012
• Est. Priority Date: 03/27/2009
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Katsumoto, Kazunari, Kaise, Yasuyoshi
• Application Number:
  US13/259,089
• Publication Number:
  US 20120013839A1
• Time in Patent Office: Days
• US Class Current: 349/139
• 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 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• 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 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors

Abstract

Provided are a display panel and a display device which are capable of suppressing the occurrence of horizontal crosstalk and ensuring the aperture ratio of the whole display panel. The auxiliary capacitance electrode of a pixel forming portion (110) of a liquid crystal panel (10) is connected to an auxiliary capacitance wiring line (Cs) and an opposite electrode (152). Therefore, if the potential of the auxiliary capacitance wiring line (Cs) is drawn in by the parasitic capacitance of the intersection of the auxiliary capacitance wiring line (Cs) and a data signal line (SL), the potential of the auxiliary capacitance wiring line (Cs) is quickly recovered to the original common potential, and it is thereby possible to suppress the occurrence of horizontal crosstalk. The auxiliary capacitance electrode (142) of a pixel forming portion (120) of the liquid crystal panel (10) is connected only to the auxiliary capacitance wiring line (Cs). Thus, since the aperture ratio of the pixel forming portion (120) is larger than that of the pixel forming portion (110), it is possible to ensure a large aperture ratio in the whole display panel (10). A columnar spacer (194) is disposed at the position opposite to a contact pad (144).

Claims

1. An active matrix system display panel, comprising:

a first insulating substrate having a data signal line, a scan signal line, an auxiliary capacitance wiring line formed so as to intersect with said data signal line, and a plurality of first pixel forming portions; and

a second insulating substrate that is disposed to face said first insulating substrate, and that has an opposite electrode formed commonly for said plurality of first pixel forming portions,

wherein each of said plurality of first pixel forming portions comprises;

a pixel capacitance formed by a pixel electrode and said opposite electrode; and

an auxiliary capacitance formed by an auxiliary capacitance electrode connected to said auxiliary capacitance wiring line, which is to be applied with potential synchronized with potential of said opposite electrode, and by an auxiliary opposite electrode that is disposed to face said auxiliary capacitance electrode and that is connected to said pixel electrode, and

wherein said auxiliary capacitance electrode of said first pixel forming portion is further connected to said opposite electrode within said first pixel forming portion.

2. The display panel according to claim 1, further comprising a plurality of second pixel forming portions formed on said first insulating substrate,

wherein said opposite electrode is also formed commonly for said plurality of second pixel forming portions, and

wherein each of said plurality of second pixel forming portions comprises:

a pixel capacitance that is formed by a pixel electrode and said opposite electrode; and

an auxiliary capacitance that is formed by an auxiliary capacitance electrode connected to said auxiliary capacitance wiring line, which is to be applied with potential synchronized with potential of said opposite electrode, and an auxiliary opposite electrode that is disposed to face said auxiliary capacitance electrode and that is connected to said pixel electrode.

3. The display panel according to claim 1,

wherein said first pixel forming portion further comprises a columnar spacer part that has a surface in which a part of said opposite electrode is formed, and a contact electrode that is electrically connected to said auxiliary capacitance electrode, and

wherein an opposite electrode formed on said surface of said spacer part is in contact with said contact electrode.

4. The display panel according to claim 2, wherein each of said first pixel forming portions is disposed for a predetermined number of said second pixel forming portions.

5. The display panel according to claim 2,

wherein said first and second pixel forming portions include a thin film transistor, and

wherein said auxiliary opposite electrode is unitarily formed with a channel part of said thin film transistor.

6. The display panel according to claim 2,

wherein said first and second pixel forming portions include a thin film transistor,

wherein said auxiliary capacitance electrode is disposed outside said scan signal line,

wherein said auxiliary opposite electrode is disposed in a region that is under said auxiliary capacitance wiring line and that is interposed between two of said data signal lines adjacent to each other, and

wherein said thin film transistor is formed in a region that is interposed between said auxiliary capacitance wiring line and said scan signal line.

7. The display panel according to claim 2, wherein said auxiliary opposite electrode is said pixel electrode.

8. The display panel according to claim 2, wherein said auxiliary capacitance electrode is made of a part of said auxiliary capacitance wiring line.

9. The display panel according to claim 3, wherein said spacer part includes a light-shielding layer that is formed so as to cover a surface opposite to a surface in contact with said auxiliary capacitance electrode.

10. A display device comprises the display panel according to claim 1.