Rollable flexible display device

Patent metadata

Field	Value
Publication number	US-10599185-B2
Application number	US-201715662694-A
Country	US
Kind code	B2
Filing date	Jul 28, 2017
Priority date	Jul 29, 2016
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

The present disclosure provides a rollable flexible display device. The rollable flexible display device including a display panel that displays an image and rolls or unrolls like a scroll, a sensing circuit that performs sensing to detect rolled and unrolled portions of the display panel and outputs sensed values, and a device adjusting part that adjusts the operating conditions of the display panel based on the sensed values sent from the sensing circuit.

First claim

What is claimed is:

1. A rollable flexible display device comprising:
a display panel displaying an image and configured to be rolled or unrolled;
a panel roller part that includes a first disc having a light emitter, a second disc having transmission holes for passing light from the light emitter and a third disc having a light receiving sensor and senses rotational amount values and rotational direction values to detect rolled and unrolled portions of the display panel;
a sensing circuit configured to digitize the sensed rotational amount values and the rotational direction values and outputting the digitized sensed rotational amount values and the sensed digitized rotational direction values; and
a device adjusting part adjusting operating conditions of the display panel based on the sensed values obtained from the sensing circuit.

2. The rollable flexible display device of claim 1 , wherein the device adjusting part varies at least one of resolution, operating frequency, and brightness of the display device.

3. The rollable flexible display device of claim 1 , wherein the device adjusting part changes the displayed image based on a ratio of the rolled and unrolled portions of the display panel.

4. The rollable flexible display device of claim 1 , wherein the device adjusting part performs image processing on the unrolled portion of the display panel to generate a compensated data signal and a control signal for adjusting the display device driving the display panel.

5. The rollable flexible display device of claim 4 , wherein the device adjusting part comprises:
a determiner determining whether or how much a shape of the display panel is deformed, based on the sensed values; and
an adjustor generating the compensated data signal, which is obtained by compensating for an input data signal based on changes provided by the determiner, and the control signal for adjusting display device driving the display panel.

6. The rollable flexible display device of claim 5 , wherein the determiner determines whether or how much the shape of the display panel is deformed by comparing test values in an internal lookup table and sensed values obtained by the sensing unit.

7. The rollable flexible display device of claim 5 , wherein the determiner determines whether or how much organic light-emitting diodes and driving transistors in subpixels of the display panel are degraded, based on sensed values provided by a data driver.

8. The rollable flexible display device of claim 5 , wherein the device adjusting part comprises:
a determiner determining based on the sensed values whether or how much a shape of the display panel is deformed; and
an adjustor generating the compensated data signal, which is obtained by compensating for an input data signal based on changes provided by the determiner, and the control signal for adjusting display device driving the display panel.

9. The rollable flexible display device of claim 8 , wherein the determiner determines whether or how much the shape of the display panel is deformed by comparing test values in an internal lookup table and sensed values obtained by the sensing unit.

10. The rollable flexible display device of claim 1 , wherein the sensing circuit comprises:
sensing lines located on the display panel; and
a multiplexer that performs a switching operation to connect the sensing lines and the sensing circuit by a time-division method.

11. The rollable flexible display device of claim 10 , wherein the sensing circuit detects parasitic values through the sensing lines connected to subpixels of the display panel, and determines the rolled and unrolled portions of the display panel based on changes in the parasitic values.

12. The rollable flexible display device of claim 1 , wherein the sensing circuit comprises:
sensing lines located on the display panel; and
sensors connected to the sensing lines.

13. The rollable flexible display device of claim 12 , wherein the sensing lines and the sensors are located on upper and lower portions of the display panel.

14. The rollable flexible display device of claim 13 , wherein the sensors include light sensors or illumination sensors capable of sensing light or pressure sensors capable of sensing pressure.

15. The rollable flexible display device of claim 1 , wherein the panel roller part provides a mechanical structure to allow the display panel to roll and unroll around an outer circumferential surface.

16. The rollable flexible display device of claim 15 , further comprising a housing accommodating the panel roller part.

17. The rollable flexible display device of claim 16 , wherein the sensing circuit is disposed between the panel roller part and the housing.

18. The rollable flexible display device of claim 15 , wherein the sensing circuit comprises an analog-digital converter circuit.

19. The rollable flexible display device of claim 1 , further comprising a motor part providing torque to allow the panel roller part to rotate in different directions in response to externally supplied signal and power.

20. The rollable flexible display device of claim 1 , when the second disc rotates in one direction when the light received by the light receiving sensor is transmitted through a first shape transmission hole of the transmission holes and rotates in an opposite direction when the light received by the light receiving sensor is transmitted through a second shape transmission hole of the transmission holes.

21. A rollable flexible display device, comprising:
a display panel displaying an image and configured to be rolled or unrolled;
a panel roller part that includes a first disc having a light emitter, a second disc having transmission holes for passing light from the light emitter and a third disc having a light receiving sensor, senses rotational amount values and rotational direction values to detect rolled and unrolled portions of the display panel and provides a mechanical structure to allow the display panel to be rolled and unrolled around an outer circumferential surface;
a sensing circuit configured to digitize the sensed rotational amount values and the rotational direction values and outputting the digitized sensed rotational amount values and the digitized sensed rotational direction values;
a device adjusting part adjusting operating conditions of the display panel based on the sensed values obtained from the sensing circuit; and
a housing accommodating the panel roller part.

22. The rollable flexible display device of claim 21 , wherein the sensing circuit comprises an analog-digital converter circuit.

Assignees

• Lg Display Co Ltd

Inventors

• Yu Sangho
• Kim Seungtae

Classifications

• 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

• G06F2203/04102

  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 title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• H04M1/0268

  including a flexible display panel · CPC title