# US 12,602,080 B2 · Stacked body for flexible display device, stacked body for display device and flexible display device

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- Number: US 12,602,080 B2
- Document ID: US12602080B2
- Status: Granted
- Kind: B2
- Application number: 17/905,723
- Filed: 2021-03-09
- Published: 2023-09-21
- Granted: 2026-04-14
- Earliest claimed: 2020-03-09
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Keisuke Yamada; Jun Sato; Saori Kawaguchi
- Web page: https://patentgrep.com/patent/US12602080B2

## CPC

- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- B32B 7/025: Electric or magnetic properties
- G02B 1/14: Protective coatings, e.g. hard coatings
- G06F 1/1637: {Details related to the display arrangement, including those related to the mounting of the display in the housing}
- G06F 1/1641: {the display being formed by a plurality of foldable display components (G06F1/1647 takes precedence)}
- H05B 33/02: Details
- H05K 5/03: Covers
- H05K 9/0067: {Devices for protecting against damage from electrostatic discharge}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

The present disclosure provides a stacked body for a flexible display device comprising a substrate layer, and an antistatic layer, wherein a surface resistance of an antistatic layer side surface of the stacked body for a flexible display device is 9×1013Ω/□ or less; and a surface resistance of the antistatic layer side surface of the stacked body for a flexible display device after an eraser test is 9×1013Ω/□ or less, wherein, in the eraser test, the antistatic layer side surface of the stacked body for a flexible display device is rubbed with a 6 mm diameter eraser, for 2500 strokes, applying a load of 9.8 N.

## Claims

### Claim 1

A stacked body for a flexible display device comprising a substrate layer, and an antistatic layer, wherein
a surface resistance of an antistatic layer side surface of the stacked body for a flexible display device is 9×1013Ω/□ or less;
a surface resistance of the antistatic layer side surface of the stacked body for a flexible display device after an eraser test is 9×1013Ω/□ or less, wherein, in the eraser test, the antistatic layer side surface of the stacked body for a flexible display device is rubbed with a 6 mm diameter eraser, for 2500 strokes, applying a load of 9.8 N, and
a ratio of the surface resistance of the antistatic layer side surface of the stacked body for a flexible display device after the eraser test to the surface resistance of the antistatic layer side surface of the stacked body for a flexible display device before the eraser test is 20.0 or less.

### Claim 2 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein a functional layer is included on an antistatic layer surface side of the substrate layer.

### Claim 3 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein the antistatic layer is placed on an outermost surface.

### Claim 4 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein an impact absorbing layer is included on a surface of the substrate layer, on an opposite surface side to the antistatic layer, or between the substrate layer and the antistatic layer.

### Claim 5 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein an adhesive layer for adhesion is included on a surface of the substrate layer, on an opposite surface side to the antistatic layer.

### Claim 6 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein the ratio is 10.0 or less.

### Claim 7 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein the ratio is 5.0 or less.

### Claim 8 (depends on 1)

The stacked body for a flexible display device according to claim 1, wherein a minimum surface resistance value of the antistatic layer side surface of the stacked body for a flexible display device before the eraser test is 2.4×1012Ω/□.

### Claim 9 (depends on 1)

A flexible display device comprising:
a display panel, and
the stacked body for a flexible display device according to claim 1 placed on an observer side of the display panel.

### Claim 10

A stacked body for a display device comprising a substrate layer, and an antistatic layer, wherein
a surface resistance of an antistatic layer side surface of the stacked body for a display device is 9×1013Ω/□ or less;
a surface resistance of the antistatic layer side surface of the stacked body for a display device after an eraser test is 9×1013Ω/□ or less, wherein, in the eraser test, the antistatic layer side surface of the stacked body for a display device is rubbed with a 6 mm diameter eraser, for 2500 strokes, applying a load of 9.8 N, and
a ratio of the surface resistance of the antistatic layer side surface of the stacked body for a display device after the eraser test to the surface resistance of the antistatic layer side surface of the stacked body for a display device before the eraser test is 20.0 or less.

### Claim 11 (depends on 10)

The stacked body for a display device according to claim 10, wherein the ratio is 10.0 or less.

### Claim 12 (depends on 10)

The stacked body for a display device according to claim 10, wherein the ratio is 5.0 or less.

### Claim 13 (depends on 10)

The stacked body for a display device according to claim 10, wherein a minimum surface resistance value of the antistatic layer side surface of the stacked body for a flexible display device before the eraser test is 2.4×1012Ω/□.