Light control panel and display device including the same

Patent metadata

Field	Value
Publication number	US-12529933-B2
Application number	US-202217955474-A
Country	US
Kind code	B2
Filing date	Sep 28, 2022
Priority date	Dec 14, 2021
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

The present disclosure relates to a display device including a pixel portion in which sub-pixels are disposed and at least one transparent portion which is disposed around the pixel portion and transmits external light therethrough, wherein the pixel portion may include first to fourth extension parts which extend in different directions and include wirings, and may include first to fourth circuit parts which are disposed between the adjacent extension parts and include circuit elements of each of the sub-pixels.

First claim

What is claimed is:

1 . A display device comprising:
a display panel comprising a pixel area in which pixels are disposed and a transmissive area disposed adjacent to the pixel area; and a light control panel disposed on a surface of the display panel and configured to control light transmittance according to an externally applied data voltage, wherein the light control panel comprises:
a first electrode and a second electrode which are formed of a transparent conductive material and are supplied with a voltage;
a suspended particle layer interposed between the first electrode and the second electrode; and
an insulating polymer layer that is interposed between the suspended particle layer and the first electrode and comprises conductive metal electrodes patterned in the form of an island,
wherein the insulating polymer layer comprises a transparent polymer insulating material in which a plurality of holes are included, and
wherein the metal electrodes are disposed in each of the holes.

2 . The display device of claim 1 , wherein the light control panel is disposed on a bottom surface of the display panel opposite to a top surface of the display panel for displaying an image.

3 . The display device of claim 2 , wherein the suspended particle layer comprises colored suspended particles which are dispersed in a transparent solvent and are electrically charged.

4 . The display device of claim 3 , wherein at least a portion of the metal electrode is disposed to overlap the pixel area.

5 . The display device of claim 4 , wherein at least a portion of the metal electrode is disposed to overlap the transmissive area.

6 . The display device of claim 3 , wherein the suspended particles are black particles.

7 . The display device of claim 3 ,
wherein the metal electrodes are disposed to fill an entire or a portion of each of the holes.

8 . The display device of claim 7 , wherein the hole and the metal electrode are formed such that a width at a top surface thereof that is in contact with the suspended particle layer is greater than or equal to a width at a bottom surface thereof that is in contact with the first electrode.

9 . The display device of claim 7 , wherein, when the voltage is applied to the first electrode, the voltage is transmitted to the metal electrodes in contact with the first electrode, and wherein the suspended particles are aggregated around the metal electrode by an electric field formed between the first electrode and the second electrode.

10 . The display device of claim 9 , wherein, when the suspended particles are aggregated around the metal electrode, a part of light incident from the outside of the light control panel passes through the transmissive area of the display panel and the light control panel and is emitted to the top surface of the display panel.

11 . The display device of claim 7 , wherein, when the voltage is not applied to the first electrode, light incident from the outside of the light control panel is blocked from being emitted to the top surface of the display panel by the dispersed suspended particles.

12 . The display device of claim 7 , wherein the first electrode is patterned into a plurality of areas which are divided from each other and receive the voltage independently.

13 . The display device of claim 12 , wherein sizes and shapes of the plurality of areas are determined in response to a split screen mode provided through the display panel.

14 . The display device of claim 13 , wherein, when the voltage is applied to a first area among the plurality of areas, the voltage is transmitted to first metal electrodes disposed on the first area, and the suspended particles are aggregated only around the first metal electrodes in the first area.

15 . The display device of claim 14 , wherein, when the suspended particles are aggregated only around the first metal electrodes in the first area, external light incident on the first area passes through the transmissive area of the display panel and the light control panel and is emitted to the top surface of the display panel, and external light incident on the remaining areas among the plurality of areas is blocked from being emitted to the top surface of the display panel by the dispersed suspended particles.

16 . The display device of claim 12 , wherein, when an image is displayed on only a portion of the display panel and no image is displayed on the remaining portion of the display panel, the voltage is applied to areas among the plurality of areas of the first electrode overlapping the portion of the display panel, and is not applied to remaining areas among the plurality of areas.

17 . The display device of claim 2 , wherein the first electrode is disposed above or under the second electrode.

18 . The display device of claim 2 , wherein the first electrode is configured to receive one of a high potential voltage and a low potential voltage, and the second electrode is configured to receive the other of the high potential voltage and the low potential voltage.

19 . A light control panel comprising:
a first electrode comprising a transparent conductive material and receiving a first voltage; a second electrode of comprising the transparent conductive material and receiving a second voltage; a suspended particle layer interposed between the first electrode and the second electrode; and an insulating polymer layer that is interposed between the suspended particle layer and the first electrode and comprises conductive metal electrodes patterned in the form of an island, wherein the insulating polymer layer comprises a transparent polymer insulating material in which a plurality of holes are included, and wherein the metal electrodes are disposed in each of the holes.

20 . The light control panel of claim 19 , wherein the suspended particle layer comprises colored suspended particles which are dispersed in a transparent solvent and are electrically charged.

21 . The light control panel of claim 20 ,
wherein the metal electrodes are disposed to fill an entire or a portion of each of the holes.

22 . The light control panel of claim 21 , wherein the hole and the metal electrode are formed such that a width at a top surface thereof that is in contact with the suspended particle layer is greater than or equal to a width at a bottom surface thereof that is in contact with the first electrode.

23 . The light control panel of claim 21 , wherein a ratio of a pitch between the metal electrodes to a width of the metal electrodes is 89%.

24 . The light control panel of claim 21 , wherein the suspended particle layer is comprised of electronic ink in which carbon black is dispersed in a fluid or in oil solvent.

25 . The light control panel of claim 24 , wherein the suspended particle layer is formed by dropping or applying the electronic ink between adjacent dams.

26 . The light control panel of claim 21 , wherein the polymer insulating material is an adhesive film or UV resin.

Assignees

• Lg Display Co Ltd

Inventors

• Park Jaehyun

Classifications

• G02F1/1676

  Electrodes · CPC title

• G02F1/167

  by electrophoresis · CPC title

• H10K59/121

  characterised by the geometry or disposition of pixel elements · CPC title

• G02F1/169

  based on orientable non-spherical particles having a common optical characteristic, e.g. suspended particles of reflective metal flakes · CPC title

• G02F2203/01

  transmissive · CPC title