# US 11,079,804 B2 · Back plate structure and flexible display device

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- Number: US 11,079,804 B2
- Document ID: US11079804B2
- Status: Granted
- Kind: B2
- Application number: 16/867,703
- Filed: 2020-05-06
- Published: 2020-08-20
- Granted: 2021-08-03
- Earliest claimed: 2018-09-19
- Assignees: Yungu (Gu'an) Technology Co., Ltd.
- Applicants: Yungu (Gu'an) Technology Co., Ltd.
- Inventors: Zhaoji Zhu; Liwei Ding; Fu Liao; Hongqi Hou; Liuyang Wang; Yongfeng Zhao
- Web page: https://patentgrep.com/patent/US11079804B2

## CPC

- G09F 9/301: {flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED}
- G02F 1/1333: Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence)
- G06F 1/1616: {with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position}
- G06F 1/1641: {the display being formed by a plurality of foldable display components (G06F1/1647 takes precedence)}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- G06F 1/1681: {Details related solely to hinges (hinge details related to the transmission of signals or power are classified in G06F1/1683)}
- H05K 5/0217: {Mechanical details of casings (covers, lids, hoods or members for covering apertures H05K5/03)}
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

The present application provides a back plate structure and a flexible display device. The back plate structure includes: a first back plate, a second back plate and a flexible shaft. The first back plate and the second back plate are connected by the flexible shaft. The flexible shaft includes an arch component and at least one end component. The arch component includes a concave surface and a convex surface corresponding to the concave surface, and the concave surface faces a bending direction of the flexible display device. Each end component includes at least one foldable structure, and each foldable structure includes two planes parallel to a bending axis of the flexible display device. Each end component is located at an end of the arch component and obscures a space formed by the arch component.

## Claims

### Claim 1

A back plate structure, used in a flexible display device, comprising:
a first back plate;
a second back plate; and
a flexible shaft, wherein,
the first back plate and the second back plate are connected by the flexible shaft;
the flexible shaft comprises an arch component and at least one end component;
the arch component comprises a concave surface and a convex surface corresponding to the concave surface, and the concave surface faces a bending direction of the flexible display device;
each end component is located at an end of the arch component and obscures a space formed by the arch component; and
the end component comprises at least one foldable structure, and each foldable structure comprises two planes parallel to a bending axis of the flexible display device;
wherein the end component further comprises a partition, both ends of which are connected to the first back plate and the second back plate respectively;
the at least one foldable structure comprises a plurality of V-shaped structural layers, each V-shaped structural layer comprises a plurality of V-shaped units, an opening of each V-shaped unit faces the first back plate or the second back plate;
one end of the V-shaped unit is connected to an end surface of the arch component, and the other end of the V-shaped unit is connected to a surface of the partition adjacent to the arch component;
the plurality of V-shaped structural layers are arranged in layers on the surface of the partition adjacent to the arch component, and V-shaped units in two adjacent V-shaped structural layers are alternately arranged.

### Claim 2 (depends on 1)

The back plate structure according to claim 1, wherein the plurality of V-shaped structures are integrally formed end-to-end and are connected between the first back plate and the second back plate, and the opening of each V-shaped structure faces the bending direction of the flexible display device.

### Claim 3 (depends on 2)

The back plate structure according to claim 2, wherein the end component further comprises a plurality of baffles located at troughs of the plurality of V-shaped structures respectively and connected between the plurality of V-shaped structures and the arch component.

### Claim 4 (depends on 2)

The back plate structure according to claim 2, wherein the end component further comprises a first baffle and a second baffle, the end component is connected to the first back plate and the second back plate by the first baffle and the second baffle respectively, and the first baffle and the second baffle are respectively connected to the arch component.

### Claim 5 (depends on 2)

The back plate structure according to claim 2, wherein a thickness of the arch component is between 0.6 mm and 0.8 mm.

### Claim 6 (depends on 2)

The back plate structure according to claim 2, wherein a material of the flexible shaft comprises at least one of rubber, inorganic silica gel, and thermoplastic elastomer.

### Claim 7 (depends on 1)

The back plate structure according to claim 1, wherein an opening angle of the V-shaped unit is between 60° and 150°.

### Claim 8 (depends on 1)

The back plate structure according to claim 1, wherein
the end component further comprises a plurality of herringbone units, an opening of each herringbone unit faces the arch component, and both ends of the opening of the herringbone unit are connected to an end surface of the arch component;
the opening of each V-shaped unit faces the bending direction of the flexible display device, and the plurality of V-shaped units are connected to the plurality of herringbone units at intervals.

### Claim 9 (depends on 6)

The back plate structure according to claim 6, wherein the end component further comprises a first baffle and a second baffle, the end component is connected to the first back plate and the second back plate by the first baffle and the second baffle respectively, and the first baffle and the second baffle are respectively connected to the arch component.

### Claim 10 (depends on 6)

The back plate structure according to claim 6, wherein a thickness of the arch component is between 0.6 mm and 0.8 mm.

### Claim 11 (depends on 1)

The back plate structure according to claim 1, wherein the end component further comprises a first baffle and a second baffle, the end component is connected to the first back plate and the second back plate by the first baffle and the second baffle respectively, and the first baffle and the second baffle are respectively connected to the arch component.

### Claim 12 (depends on 1)

The back plate structure according to claim 1, wherein a thickness of the arch component is between 0.6 mm and 0.8 mm.

### Claim 13

A flexible display device, comprising:
a back plate structure comprising a first back plate, a second back plate and a flexible shaft, wherein, the first back plate and the second back plate are connected by the flexible shaft;
the flexible shaft comprises an arch component and at least one end component;
the arch component comprises a concave surface and a convex surface corresponding to the concave surface, and the concave surface faces a bending direction of the flexible display device;
each end component is located at an end of the arch component and obscures a space formed by the arch component; and
the end component comprises at least one foldable structure, and each foldable structure comprises two planes parallel to a bending axis of the flexible display device;
wherein the end component further comprises a partition, both ends of which are connected to the first back plate and the second back plate respectively;
the at least one foldable structure comprises a plurality of V-shaped structural layers, each V-shaped structural layer comprises a plurality of V-shaped units, an opening of each V-shaped unit faces the first back plate or the second back plate;
one end of the V-shaped unit is connected to an end surface of the arch component, and the other end of the V-shaped unit is connected to a surface of the partition adjacent to the arch component;
the plurality of V-shaped structural layers are arranged in layers on the surface of the partition adjacent to the arch component, and V-shaped units in two adjacent V-shaped structural layers are alternately arranged; and
a display panel, disposed on one side of the concave surface of the back plate structure.

### Claim 14 (depends on 13)

The flexible display device according to claim 13, wherein a vertical distance between the end component of the back plate structure and an end of the display panel is between 0.5 mm and 1 mm.