Liquid crystal display device comprising first and second electrodes wherein the second electrode is connected with a source electrode without passing through a first insulating film

• US 8,879,036 B2
• Filed: 12/18/2012
• Issued: 11/04/2014
• Est. Priority Date: 09/04/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Sasaki, Tohru, Ochiai, Takahiro
• Primary Examiner(s): Lee, Paul
• Application Number:
  US13/718,467
• Publication Number:
  US 20130107151A1
• Time in Patent Office: 686 Days
• Field of Search: 349/42, 349/43, 349/139, 349/141, 349/147, 349/38
• US Class Current: 349/139
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• 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 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• 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 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• 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 27/1255 integrated with passive devices, e.g. auxiliary capacitors

Abstract

To form a sufficiently large storage capacitor, a liquid crystal display device includes a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal held between the first substrate and the second substrate, the liquid crystal display panel having multiple pixels arranged in matrix. The first substrate has, in a transmissive display area provided in each of the pixels, a laminated structure containing a first transparent electrode, a first insulating film, a second transparent electrode, a second insulating film, and a third transparent electrode which are laminated in this order. The first transparent electrode and the second transparent electrode are electrically insulated from each other and together form a first storage capacitor through the first insulating film, and the second transparent electrode and the third transparent electrode are electrically insulated from each other and together form a second storage capacitor through the second insulating film.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal held between the first substrate and the second substrate, the liquid crystal display panel having multiple pixels arranged in matrix, a thin film transistor which each of the multiple pixels has, a signal line connected with a drain electrode of the thin film transistor, a gate line connected with a gate electrode of the thin film transistor; and

a display area provided in at least part of each of the pixels,

wherein

the display area has a laminated structure containing a first electrode, a first insulating film, a second electrode, a second insulating film, and a third electrode which are laminated in this order with the first electrode closest to the first substrate,

the first electrode substantially covers the display area in a plan view,

the second electrode substantially covers the display area in a plan view,

the second electrode has a first region which overlaps with the first electrode and a second region which does not overlap with the first electrode,

the second region is disposed at a side of the signal line in the second electrode, and protrudes in a direction from the first region toward the signal line and where the gate line extends,

the second electrode is connected with a source electrode of the thin film transistor without passing through the first insulating film, and

a part of the second electrode is disposed between the first insulating film and the source electrode.

2. A liquid crystal display device according to claim 1, wherein the part of the second electrode is connected with the source electrode without a contact hole.

3. A liquid crystal display device comprising:

a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal held between the first substrate and the second substrate, the liquid crystal display panel having multiple pixels arranged in matrix, a thin film transistor which each of the multiple pixels has, a signal line connected with a drain electrode of the thin film transistor, a gate line connected with a gate electrode of the thin film transistor; and

a display area provided in at least part of each of the pixels,

wherein

the display area has a laminated structure containing a first electrode, a first insulating film, a second electrode, a second insulating film, and a third electrode which are laminated in this order with the first electrode closest to the first substrate,

the first electrode substantially covers the display area in a plan view,

the second electrode substantially covers the display area in a plan view,

the second electrode has a first region which overlaps with the first electrode and a second region which does not overlap with the first electrode,

the second region is disposed at a side of the signal line in the second electrode, and protrudes in a direction from the first region toward the signal line and where the gate line extends,

the second electrode is connected with a source electrode of the thin film transistor without passing through the first insulating film,

a part of the second electrode is disposed on an upper surface of the source electrode, the upper surface being opposite to the first insulating film, and

the part of the second electrode is connected with the upper surface without a contact hole.

4. A liquid crystal display device comprising:

a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal held between the first substrate and the second substrate, the liquid crystal display panel having multiple pixels arranged in matrix, a thin film transistor which each of the multiple pixels has, a signal line connected with a drain electrode of the thin film transistor, a gate line connected with a gate electrode of the thin film transistor; and

a display area provided in at least part of each of the pixels,

wherein

the display area has a laminated structure containing a first electrode, a first insulating film, a second electrode, a second insulating film, and a third electrode which are laminated in this order with the first electrode closest to the first substrate,

the first electrode is formed in a rectangular shape and substantially covers the display area in a plan view,

the second electrode is formed in a rectangular shape and substantially covers the display area in a plan view,

the second electrode is connected with a source electrode of the thin film transistor without passing through the first insulating film,

the second electrode has a first region which overlaps with the first electrode and a second region which does not overlap with the first electrode, and

the second region is disposed at a side of the signal line in the second electrode, and protrudes in a direction from the first region toward the signal line and where the gate line extends, wherein the second electrode is connected with a source electrode of the thin film transistor without passing through the first insulating film, and a part of the second electrode is disposed between the first insulating film and the source electrode.