FLEXIBLE IMAGE DISPLAY DEVICE

• US 20170147117A1
• Filed: 11/21/2016
• Published: 05/25/2017
• Est. Priority Date: 11/20/2015
• Status: Active Grant

• Current Assignee: Dongwoo Fine-Chem Co., Ltd. (Sumitomo Chemical Company Ltd.)
• Original Assignee: Dongwoo Fine-Chem Co., Ltd. (Sumitomo Chemical Company Ltd.)
• Inventors: SONG, Byung Hoon, SONG, In Kyu
• Granted Patent: US 10,078,388 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 50/868 Arrangements for polarized light emission H10K50/86 takes precedence
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

A flexible image display device includes a window substrate, a polarizing plate, and a touch panel, wherein a distance between a neutral plane and a lower surface of the touch panel based on a visible side during bending is 34% or less to an entire thickness of the flexible image display device. The flexible image display device has excellent flexibility and may significantly reduce a defect rate due to a damage of the touch panel by minimizing the damage of the touch panel even if repeatedly applying bending fatigue thereto.

Claims

1. A flexible image display device comprising:

a window substrate;

a polarizing plate; and

a touch panel between the window substrate and the polarizing plate, wherein a distance between a neutral plane and a lower surface of the touch panel based on a visible side during bending is 34% or less to an entire thickness of the flexible image display device.

2. The flexible image display device according to claim 1, further comprising a display panel disposed on a side opposite to the window substrate based on the polarizing plate and the touch panel.

3. The flexible image display device according to claim 2, wherein a thickness between an upper surface of the window substrate and a lower surface of the display panel is 500 μ

m or less.

4. The flexible image display device according to claim 2, wherein the window substrate has a thickness thicker than a total thickness of the polarizing plate, the touch panel and the display panel, and an elastic modulus larger than an elastic modulus of a laminate of the polarizing plate, the touch panel and the display panel.

5. The flexible image display device according to claim 2, wherein the window substrate, the touch panel and the display panel have an elastic modulus of 2 GPa to 7 GPa, respectively, and the polarizing plate has an elastic modulus of 7 GPa or less.

6. The flexible image display device according to claim 2, wherein optical clear adhesive layers are located between the window substrate and the polarizing plate, and between the touch panel and the display panel.

7. The flexible image display device according to claim 1, wherein a substrate of the touch panel has a toughness of 2,000 Mpa % or more.

8. The flexible image display device according to claim 1, wherein the touch panel satisfies Equation 1 below:

(Toughness of touch panel substrate/Stress applied to the touch panel during bending)≧

9%  

 

[Equation 1]

wherein the stress is a stress applied to the touch panel when bending the flexible image display device with a radius of curvature of 2.5 mm at a speed of 40 times/minute at room temperature by repeating 300,000 times.

9. The flexible image display device according to claim 2, wherein the window substrate, the polarizing plate, the touch panel and the display panel are laminated in this order.

10. The flexible image display device according to claim 9, wherein the substrate of the touch panel has a front retardation of ±

2.5 nm or less.

11. The flexible image display device according to claim 2, wherein the window substrate, the touch panel, the polarizing plate and the display panel are laminated in this order.