Display device

• US 10,459,264 B2
• Filed: 06/21/2017
• Issued: 10/29/2019
• Est. Priority Date: 06/24/2016
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Tomioka, Yasushi, Yamaguchi, Hajime
• Primary Examiner(s): Ma, Calvin C
• Application Number:
  US15/628,972
• Publication Number:
  US 20170371194A1
• Time in Patent Office: 860 Days
• Field of Search: 345 76, 345214, 257 72
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: H01L 23/4985 Flexible insulating substrates H01L23/49572 and H01L23/49855 take precedence
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate
• 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: H05K 1/0281 Reinforcement details thereof
• CPC Class Codes: H05K 1/147 at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit H05K1/148 takes precedence
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10128 Display
• CPC Class Codes: H05K 3/323 by applying an anisotropic conductive adhesive layer over an array of pads
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

According to one embodiment, a display device includes a first substrate including a first area and a second area, the first area including a display area where pixels are arranged, and the second area being adjacent to the first area and where wirings are arranged, wherein the wirings are covered with a protection layer, the second area includes a peripheral area and a central area in an arrangement direction of the wirings, and a thickness of at least one of the first substrate and the protection layer varies between the peripheral area and the central area.

Claims

1. A display device comprising:

a first substrate including a first area including a display area in which pixels are arranged, a second area adjacent to the first area, and wirings; and

an external circuit mounted on the second area of the first substrate, wherein

the wirings are electrically connected to the external circuit,

the wirings in the second area are covered with a protection layer,

the second area includes first and second sides in an arrangement direction of the wirings, a central area located between the first and second sides, a first peripheral area located between the first side and the central area, and a second peripheral area located between the second side and the central area, and

a thickness of the protection layer in the central area is different from thicknesses of the protection layer in the first and second peripheral areas.

2. The display device of claim 1, wherein a first thickness of the protection layer in the central area is less than a second thickness of the protection layer in the first and second peripheral areas.

3. The display device of claim 2, wherein the protection layer includes a protection film covering the wirings in the first and second peripheral areas and the central area, and a reinforcement film provided in the first and second peripheral areas.

4. The display device of claim 1, wherein a third thickness of the first substrate in the central area is greater than a fourth thickness of the first substrate in the first and second peripheral areas.

5. The display device of claim 1, wherein the first substrate in the second area is bent along an axis parallel to the arrangement direction.

6. The display device of claim 1, wherein

the first peripheral area is provided in a range of a predetermined width from the first side, and

the second peripheral area is provided in a range of a predetermined width from the second side.

7. The display device of claim 1, wherein

a space is provided between the first peripheral area and the first side, and

a space is provided between the second peripheral area and the second side.

8. The display device of claim 1, wherein

the second area has a third side and a fourth side in an extension direction of the wirings, and

a space is provided between at least one of the first and second peripheral areas and either the third side or the fourth side.

9. The display device of claim 1, wherein

the second area has a third side and a fourth side in an extension direction of the wirings, and

at least one of the first and second peripheral areas extends from the third side to the fourth side.

10. The display device of claim 1, wherein a width of at least one of the first and second peripheral areas in the arrangement direction of the wirings is greater than or equal to 5% and less than or equal to 30% of a length of the second area in the arrangement direction.

11. A display device comprising:

a first substrate including a first area including a display area in which pixels are arranged, a second area adjacent to the first area, and wirings; and

an external circuit mounted on the second area of the first substrate, wherein

the wirings are electrically connected to the external circuit,

the wirings in the second area are covered with a protection layer,

the second area includes first and second sides in an arrangement direction of the wirings, a central area located between the first and second sides, a first peripheral area located between the first side and the central area, and a second peripheral area located between the second side and the central area

a first Young'"'"'s modulus of the protection layer in the central area is less than a second Young'"'"'s modulus of the protection layer in the first and second peripheral areas,

the protection layer has a first thickness in the central area and a second thickness in the first and second peripheral areas, and

an inequality defined as the first Young'"'"'s modulus×

the first thickness □

the second Young'"'"'s modulus×

the second thickness and an inequality defined as the second Young'"'"'s modulus×

the second thickness≤

1.5×

the first Young'"'"'s modulus×

the first thickness are satisfied.

12. The display device of claim 11, wherein the first substrate in the second area is bent along an axis parallel to the arrangement direction.

13. The display device of claim 11, wherein

the protection layer includes a protection film covering the wirings, and a reinforcement film provided in the first and second peripheral areas, and

a Young'"'"'s modulus of the protection film and a Young'"'"'s modulus of the reinforcement film are different from each other.

14. The display device of claim 11, wherein

the first peripheral area is provided in a range of a predetermined width from the first side, and

the second peripheral area is provided in a range of a predetermined width from the second side.

15. The display device of claim 11, wherein

a space is provided between the first peripheral area and the first side, and

a space is provided between the second peripheral area and the second side.

16. The display device of claim 11, wherein

the second area has a third side and a fourth side in an extension direction of the wirings, and

a space is provided between at least one of the first and second peripheral areas and either the third side or the fourth side.

17. The display device of claim 11, wherein

the second area has a third side and a fourth side in an extension direction of the wirings, and

at least one of the first and second peripheral areas extends from the third side to the fourth side.

18. The display device of claim 11, wherein a width of at least one of the first and second peripheral areas in the arrangement direction of the wirings is greater than or equal to 5% and less than or equal to 30% of a length of the second area in the arrangement direction.