US-12628294-B2 - Display device

US12628294B2US 12628294 B2US12628294 B2US 12628294B2US-12628294-B2

Abstract

A display device can include a display part having a display panel configured to display an image, a first roller configured to wind or unwind the display part, a tape spring disposed on a rear surface of the display part, configured to move the display part in an upward/downward direction, and including a plurality of guide holes, and a second roller configured to wind or unwind the tape spring. The second roller includes a tape spring drum to which one end of the tape spring is fixed. The tape spring drum is configured to wind or unwind the tape spring and includes a plurality of guide protrusions. The second roller further includes a plurality of rotary pins spaced apart from the tape spring drum and disposed along an outer peripheral surface of the tape spring drum.

Inventors

Hyosung Lee
Seunghee Lee

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240918
Priority Date: 20230919

Claims (17)

1 . A display device comprising: a display part comprising a display panel configured to display an image; a first roller configured to wind or unwind the display part; a tape spring disposed on a rear surface of the display part, configured to move the display part in an upward/downward direction, and including a plurality of guide holes; and a second roller configured to wind or unwind the tape spring, wherein the second roller comprises: a tape spring drum to which one end of the tape spring is fixed, the tape spring drum being configured to wind or unwind the tape spring and including a plurality of guide protrusions; and a plurality of rotary pins spaced apart from the tape spring drum and disposed along an outer peripheral surface of the tape spring drum.
2 . The display device of claim 1 , wherein the plurality of guide protrusions of the tape spring drum is inserted into the plurality of guide holes of the tape spring when the tape spring is wound around the tape spring drum.
3 . The display device of claim 1 , wherein the plurality of guide holes is disposed in a longitudinal direction of the tape spring.
4 . The display device of claim 1 , wherein a rotation axis of the tape spring drum and a rotation axis of the plurality of rotary pins are parallel to each other.
5 . The display device of claim 1 , wherein the second roller further comprises: a pair of tape spring side frames disposed to face each other, the pair of tape spring side frames including a plurality of first holes coupled to two opposite ends of the tape spring drum, and a plurality of second holes coupled to two opposite ends of the plurality of rotary pins; a flat spring disposed in the plurality of second holes of the pair of tape spring side frames and configured to adjoin the plurality of rotary pins; and a plurality of sub-rollers respectively coupled to the plurality of rotary pins.
6 . The display device of claim 5 , wherein the flat spring is configured to push the plurality of rotary pins in a direction toward the tape spring drum.
7 . The display device of claim 6 , wherein the flat spring is configured to allow the plurality of sub-rollers to push the tape spring in the direction toward the tape spring drum.
8 . The display device of claim 5 , wherein a distance between the plurality of sub-rollers and the tape spring drum increases as an amount by which the tape spring is wound around the tape spring drum increases.
9 . The display device of claim 5 , wherein a distance between the plurality of rotary pins and the tape spring drum increases as an amount by which the tape spring is wound around the tape spring drum increases.
10 . The display device of claim 9 , wherein the plurality of rotary pins is configured to move in the plurality of second holes in a direction toward or away from the tape spring drum.
11 . The display device of claim 10 , wherein the flat spring is configured to be curved toward insides of the plurality of second holes when the plurality of rotary pins is positioned in the plurality of second holes, and wherein the flat spring is configured to be stretched toward an outside of the plurality of second holes when the plurality of rotary pins is disposed outside of the plurality of second holes.
12 . The display device of claim 5 , wherein the plurality of second holes disposed in each of the pair of tape spring side frames is connected.
13 . The display device of claim 5 , wherein the plurality of second holes disposed in each of the pair of tape spring side frames is spaced apart from one another, and the flat spring includes a plurality of sub-flat springs spaced apart from one another so as to respectively correspond to the plurality of rotary pins.
14 . The display device of claim 5 , further comprising: a photo sensor including a light-transmitting part and a light-receiving part, wherein the second roller further includes a coupling part disposed on the tape spring drum and coupled to the pair of tape spring side frames, and wherein the coupling part includes a sensor hole through which light emitted from the light-transmitting part passes.
15 . The display device of claim 14 , wherein the light-transmitting part is disposed at one side based on the sensor hole, and the light-receiving part is disposed at another side based on the sensor hole.
16 . The display device of claim 14 , further comprising: a roller controller configured to control rotations of the first and second rollers, wherein the roller controller controls the rotations of the first and second rollers based on a sensing result of the light-receiving part of the photo sensor.
17 . The display device of claim 16 , further comprising: a motor connected to the second roller, wherein the roller controller controls the rotations of the first and second rollers by controlling a rotation of the motor based on the sensing result of the light-receiving part of the photo sensor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Korean Patent Application No. 10-2023-0124675 filed on Sep. 19, 2023, in the Korean Intellectual Property Office, the entire contents of which is hereby expressly incorporated by reference into the present application. BACKGROUND Field The present disclosure relates to a display device, and more particularly, to a rollable display device capable of displaying images even in case that the display device is rolled up. Discussion of the Related Art As display devices used for a monitor of a computer, a TV set, a mobile phone, and the like, there are an organic light-emitting display (OLED) configured to autonomously emit, and a liquid crystal display (LCD) that requires a separate light source. The range of application of the display devices is diversified from the monitor of the computer and the TV set to personal mobile devices, and studies are being conducted on the display devices having wide display areas and having reduced volumes and weights. In addition, recently, a rollable display device is provided, which is made by forming display parts, lines, and the like on a substrate made of a flexible plastic material having flexibility. Such rollable display device can display images even in case that the rollable display device is rolled up, and thus has attracted attention as a next-generation display device. SUMMARY OF THE DISCLOSURE An object to be achieved by aspects of the present disclosure is to provide a display device capable of suppressing the occurrence of a gap and slip in the tape spring. Another object to be achieved by aspects of the present disclosure is to provide a display device capable of precisely controlling a movement amount of a display part. Still another object to be achieved by aspects of the present disclosure is to provide a display device capable of reducing friction and weight of a tape spring by using a plurality of rotary pins. Objects of the present disclosure are not limited to the above-mentioned objects, and other objects, which are not mentioned above, can be clearly understood by those skilled in the art from the following descriptions. According to an aspect of the present disclosure, there is provided a display device. The display device comprises a display part including a display panel configured to display an image, a first roller configured to wind or unwind the display part, a tape spring disposed on a rear surface of the display part, configured to move the display part in an upward/downward direction, and including a plurality of guide holes, and a second roller configured to wind or unwind the tape spring. The second roller comprises a tape spring drum to which one end of the tape spring is fixed, the tape spring drum being configured to wind or unwind the tape spring and including a plurality of guide protrusions, and a plurality of rotary pins spaced apart from the tape spring drum and disposed along an outer peripheral surface of the tape spring drum. According to aspects of the present disclosure, the tape spring drum can include the plurality of guide protrusions, and the tape spring can include the plurality of guide holes, which can suppress the occurrence of a gap and slip in the tape spring. Aspects of the present disclosure can include the plurality of rotary pins, the plurality of sub-rollers coupled to the plurality of rotary pins, and the plurality of a flat spring configured to press the plurality of rotary pins, which can more effectively suppress the occurrence of a gap and slip in the tape spring. Other detailed matters of the example embodiments of the present disclosure are included in the detailed description and the drawings. According to aspects of the present disclosure, the movement distance of the tape spring can be measured by the photo sensor, such that the winding and unwinding motions of the display device can be more precisely controlled. The effects according to aspects of the present disclosure are not limited to the above-mentioned effects, and more various effects are included in the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIGS. 1A and 1B are perspective views of a display device according to an embodiment of the present disclosure; FIG. 2A is a top plan view of a display part of the display device according to the embodiment of the present disclosure; FIG. 2B is a rear view of the display part of the display device according to the embodiment of the present disclosure; FIG. 3A is a front perspective view of the display device according to the embodiment of the present disclosure; FIG. 3B is a rear perspective view of the display device according to the embodiment of the present disclosure; FIG. 4 is a perspective view of