Display device comprising a transparent counter electrode having an opening that overlaps with the opening of a first insulating film and a second insulating film

• US 10,718,983 B2
• Filed: 07/31/2019
• Issued: 07/21/2020
• 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
• Inventors: Sasaki, Tohru, Ochiai, Takahiro
• Primary Examiner(s): Lee, Paul C
• Application Number:
  US16/528,008
• Publication Number:
  US 20190353967A1
• Time in Patent Office: 356 Days
• 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 display device comprising:

a thin film transistor having gate electrode, source electrode, and a drain electrode;

a first transparent pixel electrode connected to the source electrode;

a second transparent pixel electrode connected to the first transparent pixel electrode;

a transparent counter electrode sandwiched between the first transparent pixel electrode and the second transparent pixel electrode;

a first insulating film sandwiched between the first transparent pixel electrode and the transparent counter electrode; and

a second insulating film sandwiched between second transparent pixel electrode and the transparent counter electrode,

wherein

the first transparent pixel electrode, the first insulating film, the transparent counter electrode, the second insulating film, and the second transparent pixel electrode are laminated in this order,

the second transparent pixel electrode connected to the first transparent pixel electrode via an opening formed in the first insulating film and the second insulating film, the transparent counter electrode has an opening, and

the opening of the transparent counter electrode overlaps with the opening of the first insulating film and the second insulating film.

2. The display device of claim 1, wherein

the first transparent pixel electrode overlaps with the second transparent pixel electrode, and

the transparent counter electrode overlaps with the first transparent pixel electrode and the second transparent pixel electrode.

3. The display device of claim 2, wherein

the first transparent pixel electrode is formed in a rectangular shape,

the second transparent pixel electrode is formed in a rectangular shape, and

an area of the transparent counter electrode is larger than an area of the first transparent pixel electrode and an area of the second transparent pixel electrode.

4. The display device of claim 2, further comprise a scanning line connected to the gate electrode;

a signal line connected to the drain electrode; and

a metal wiring parallel to the signal line, wherein

the metal wiring is sandwiched between the first insulating film and the second insulating film, and overlaps with the signal line, and

the metal wiring is in contact with the transparent counter electrode.

5. The display device of claim 2, further comprise a scanning line connected to the gate electrode;

a signal line connected to the drain electrode; and

a metal wiring parallel to the scanning line, wherein

the metal wiring is sandwiched between the first insulating film and the second insulating film, and overlaps with the scanning line, and

the metal wiring is in contact with the transparent counter electrode.

6. The display device of claim 2, further comprise a scanning line connected to the gate electrode;

a signal line connected to the drain electrode; and

a metal wiring parallel to the signal line and the scanning line, wherein

the metal wiring is sandwiched between the first insulating film and the second insulating film, and overlaps with the signal line and the scanning line,

the metal wiring is formed in a lattice shape,

the metal wiring is in contact with the transparent counter electrode.

7. The display device of claim 3, further comprise a scanning line connected to the gate electrode;

a signal line connected to the drain electrode; and

a metal wiring parallel to the signal line and the scanning line, wherein

the metal wiring is sandwiched between the first insulating film and the second insulating film, and overlaps with the signal line and the scanning line,

the metal wiring is formed in a lattice shape,

the metal wiring is in contact with the transparent counter electrode.