Display panel and display apparatus

• US 10,401,996 B2
• Filed: 12/22/2014
• Issued: 09/03/2019
• Est. Priority Date: 03/05/2014
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Orita, Tae, Nakagawa, Naoki, Ono, Takeshi, Agari, Masafumi, Mori, Seiichiro, Miyayama, Takashi, Imamura, Takuji
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Teshome, Kebede T
• Application Number:
  US15/123,570
• Publication Number:
  US 20170075461A1
• Time in Patent Office: 1,716 Days
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A display panel includes: a display functional portion formed of a display functional layer sandwiched between transparent substrates facing each other; and a touch screen portion that includes lower wiring and upper wiring made of a conductive metal material, that includes an interlayer insulating film located between the lower wiring and the upper wiring, and that includes a protective film covering the lower wiring, the upper wiring, and the interlayer insulating film. The lower wiring of the touch screen portion is formed on a surface on an observer side of the transparent substrate on the observer side.

Claims

1. A display panel, comprising:

a display functional portion formed such that a display functional layer is sandwiched between a first substrate located on an observer side and a second substrate located opposite to said observer side; and

a touch screen portion that includes a lower wire and an upper wire made of a conductive metal material, that includes an interlayer insulating film located between said lower wire and said upper wire, and that includes a protective film covering said lower wire, said upper wire, and said interlayer insulating film, wherein

said first substrate has a first surface on said observer side and a second surface opposite to said first surface, and

said lower wire of said touch screen portion is formed on said first surface of said first substrate and said upper wire is formed above said lower wire and said first surface of said first substrate, and

an arrangement interval between said upper wire and said lower wire in plan view is smaller than a thickness of said first substrate and is between 0.1 mm to 1 mm.

2. The display panel according to claim 1, wherein at least one of said lower wire and said upper wire has a multilayer structure including a lower layer film and an upper layer film located on said lower layer film, and a peripheral portion of said lower layer film protrudes from a peripheral portion of said upper layer film.

3. A display apparatus, comprising:

the display panel according to claim 1; and

a detection circuit detecting a position indicated by an indicator based on an electrostatic capacitance formed between said indicator, and said lower wire and said upper wire.

4. The display panel according to claim 2, wherein the peripheral portion of said lower layer film protrudes from the peripheral portion of said upper layer film to a distance of greater than or equal to a film thickness of said upper layer film.

5. The display panel according to claim 2, wherein said lower layer film is thinner than said upper layer film.

6. A display panel, comprising:

a display functional portion formed of a display functional layer sandwiched between a first substrate located on an observer side and a second substrate located opposite to said observer side; and

a touch screen portion that includes a lower wire and an upper wire made of a conductive metal material, that includes an interlayer insulating film located between said lower wire and said upper wire, and that includes a protective film covering said lower wire, said upper wire, and said interlayer insulating film, wherein

said first substrate has a first surface on said observer side and a second surface opposite to said surface, and

said lower wire of said touch screen portion is formed on said first surface of said first substrate and said upper wire is formed above said lower wire and said first surface of said first substrate, and

at least one of said lower wire and said upper wire has a multilayer structure including a lower layer film and an upper layer film located on said lower layer film, and a peripheral portion of said lower layer film protrudes from a peripheral portion of said upper layer film,

an arrangement interval between said upper wire and lower wire in plan view is smaller than a thickness of said first substrate and is between 0.1 mm to 1 mm.

7. The display panel according to claim 6, wherein the peripheral portion of said lower layer film protrudes from the peripheral portion of said upper layer film to a distance of greater than or equal to a film thickness of said upper layer film.

8. The display panel according to claim 6, wherein said lower layer film is thinner than said upper layer film.

9. A display apparatus, comprising:

the display panel according to claim 6; and

a detection circuit detecting a position indicated by an indicator based on an electrostatic capacitance formed between said indicator and each of said lower wire and said upper wire.

10. The display panel according to claim 6, wherein an arrangement interval between said upper wire and said lower wire in plan view is smaller than a thickness of said first substrate and is between 0.1 mm to 1 mm.

11. The display panel according to claim 6, wherein each of said lower wire and said upper wire has said multilayer structure, and said upper layer film is located on a surface of said lower layer film on said observer side.

12. The display panel according to claim 6, wherein each of said lower layer film and said upper layer film is made of metal.