Rollable display device

Patent metadata

Field	Value
Publication number	US-12045092-B2
Application number	US-202117628895-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	May 22, 2020
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A rollable display device, including a housing, a driving mechanism and a flexible bearing film which are provided in the housing, and a flexible display screen. The flexible bearing film is configured to rotate under the driving of the driving mechanism; a first end of the flexible display screen is fixed to the flexible bearing film, a second end of the flexible display screen is configured to extend out of the housing from an opening formed in the housing, and the flexible display screen can be rolled on the flexible bearing film and can be unfolded under the pulling of external force.

First claim

The invention claimed is:

1. A rollable display device, comprising a housing, a driving mechanism and a flexible bearing film which are provided in the housing, and a flexible display screen, wherein:
the flexible bearing film is configured to rotate under driving of the driving mechanism;
a first end of the flexible display screen is fixed to the flexible bearing film, a second end of the flexible display screen is configured to extend out of the housing from an opening formed on the housing, and the flexible display screen is capable of being rolled on the flexible bearing film and unfolded under pulling of an external force;
the driving mechanism comprises a driving shaft and a driven shaft which are arranged in the housing and are rotatable, and a first driving component which can drive the driving shaft to rotate, the flexible bearing film is sleeved on the driving shaft and the driven shaft and configured to drive the driven shaft to rotate when the driving shaft rotates;
a first step is arranged on an outer circumferential surface of the driving shaft, a second step is arranged on an outer circumferential surface of the driven shaft, two ends of the flexible bearing film are lapped and fixed, and the first end of the flexible display screen is butted with a first end of the flexible bearing film; and
the driving mechanism is configured so that when a second end of the flexible bearing film fits one of the first step and the second step, the other one of the first step and the second step is not in contact with the flexible bearing film, and is configured so that neither the first step or the second step is in contact with the flexible bearing film when the second end of the flexible bearing film is not in contact with the driving shaft and the driven shaft.

2. The rollable display device of claim 1 , wherein a plurality of transmission parts are arranged at positions, close to two side edges, of the flexible bearing film in a circumferential direction, a plurality of transmission fitting parts are arranged at positions, close to two ends, of the driving shaft and the driven shaft in the circumferential direction, and the transmission fitting parts are configured to fit the transmission parts for transmission during rotation of the flexible bearing film.

3. The rollable display device of claim 2 , wherein the transmission parts are through holes, and the transmission fitting parts are protrusions matched with the through holes.

4. The rollable display device of claim 2 , wherein a width of the flexible display screen is smaller than a width of the flexible bearing film, and two side edges of the flexible display screen are located between the transmission parts on two sides of the flexible bearing film.

5. The rollable display device of claim 1 , wherein heights of the first step and the second step are the same as a thickness of the flexible bearing film, and the thickness of the flexible bearing film is the same as a thickness of the flexible display screen.

6. The rollable display device of claim 1 , wherein a diameter of the outer circumferential surface of the driving shaft gradually increases from a lower position of the first step to a higher position of the first step, and a diameter of the outer circumferential surface of the driven shaft gradually increases from a lower position of the second step to a higher position of the second step.

7. The rollable display device of claim 1 , further comprising a transmission device arranged between the driving shaft and the driven shaft, wherein the driving shaft drives the driven shaft to rotate synchronously by the transmission device.

8. The rollable display device of claim 7 , wherein the transmission device is a gear transmission device, and the transmission device comprises a first gear fixed to the driving shaft, a second gear fixed to the driven shaft, and a third gear rotatably arranged on the housing and meshed with both the first gear and the second gear.

9. The rollable display device of claim 1 , further comprising a reel rotatably arranged in the housing, a second driving component capable of driving the reel to rotate, and a support piece, wherein one end of the support piece is fixed to the reel, the other end of the support piece extends out from the opening and is fixed to a second end of the flexible display screen, and the support piece is configured to be rolled on the reel when the flexible display screen is in a rolled state and configured to be unfolded and supported on a side of the flexible display screen facing away from a display side when the flexible display screen is in an unfolded state.

10. The rollable display device of claim 9 , further comprising two support plates and a first cover, wherein the housing is fixed between the two support plates, two ends of the reel movably penetrate out of the housing, the first cover is fixed to the support plates and covers an end of the reel, the second driving component is a torsion spring and sleeved on the end of the reel, and two end pins of the torsion spring are respectively fixed to the reel and the first cover.

11. The rollable display device of claim 9 , further comprising a retractable bracket located outside the housing, wherein one end of the retractable bracket is fixed to the housing, the other end of the retractable bracket is fixed to the second end of the flexible display screen, and the retractable bracket is configured to be supported on a side of the support piece facing away from the flexible display screen when the flexible display screen is in the unfolded state.

12. The rollable display device of claim 11 , wherein the retractable bracket comprises a plurality of first connecting rods which are hinged in sequence and a plurality of second connecting rods which are hinged in sequence, a middle position of each first connecting rod is hinged with a middle position of a corresponding second connecting rod, the first connecting rods and the second connecting rods located at one end of the retractable bracket are all hinged on the housing, and the first connecting rods and the second connecting rods located at the other end of the retractable bracket are all hinged at the second end of the flexible display screen.

13. The rollable display device of claim 1 , further comprising two support plates and a second cover, wherein the housing is fixed between the two support plates, two ends of the driving shaft movably penetrate out of the housing, the second cover is fixed to the support plates and covers an end of the driving shaft, the first driving component is a torsion spring and sleeved on the end of the driving shaft, and two end pins of the torsion spring are respectively fixed to the driving shaft and the second cover.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Luo Xiaofei
• Chu Shangchieh
• Zhu Hong

Classifications

• G06F1/1681

  Details related solely to hinges (hinge details related to the transmission of signals or power are classified in G06F1/1683) · CPC title

• G06F1/1652 Primary

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• G09F9/301 Primary

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title