Display panel and display device

Patent metadata

Field	Value
Publication number	US-12520708-B2
Application number	US-202318518596-A
Country	US
Kind code	B2
Filing date	Nov 23, 2023
Priority date	Jun 30, 2023
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A display panel and a display device are disclosed. The display panel includes a substrate, a light-emitting element, a pixel defining layer corresponding to a non-opening area, an encapsulation layer used to cover the light-emitting element and the pixel defining layer, and an electrically controlled capsule layer including an electrically controlled capsule arranged in an opening area. There are multiple positively or negatively charged black particles inside each electrically controlled capsule. When the light-emitting element emits light or doesn't emit light, the electrically controlled capsule at the corresponding position is in a first state or a second state, respectively. The first state is a light-transmitting state, in which black particles are located on both sides of a light exit surface of the electrically controlled capsule. The second state is a non-light-transmitting state, in which the black particles are located on a light exit surface of the electrically controlled capsule.

First claim

What is claimed is:

1 . A display panel comprising a plurality of opening areas and a plurality of non-opening areas, the display panel further comprising:
a substrate; a plurality of light-emitting elements, which are respectively arranged corresponding to the plurality of opening areas, wherein each light-emitting element comprises a bottom electrode, a light-emitting layer, and a top electrode that are stacked in sequence in a direction of getting farther away from the substrate; a pixel defining layer, arranged corresponding to each non-opening area; an encapsulation layer, used to cover the light-emitting elements and the pixel defining layers; an electrically controlled capsule layer, arranged on a side of the encapsulation layer facing away from the substrate and comprising a plurality of electrically controlled capsules, wherein each of the plurality of electrically controlled capsules is arranged corresponding to the respective opening area; wherein there is disposed a plurality of black particles in each electrically controlled capsule, and wherein the plurality of black particles are positively or negatively charged; wherein when each light-emitting element emits light, the respective electrically controlled capsule at a corresponding position is in a first state; when each light-emitting element does not emit light, the respective electrically controlled capsule at a corresponding position is in a second state; wherein the first state of each electrically controlled capsule is a light-transmitting state, in which the respective plurality of black particles are located on both sides of a light exit surface of the electrically controlled capsule; and wherein the second state of each electrically controlled capsule is a non-light-transmitting state, in which the respective plurality of black particles are located on a light-incident surface or a light exit surface of the electrically controlled capsule.

2 . The display panel recited in claim 1 , wherein each electrically controlled capsule comprises at least a first electrode and a second electrode;
wherein each electrically controlled capsule comprises the light exit surface and four side surfaces connected to the light exit surface; wherein the first electrode is arranged on the light exit surface, and the second electrode is arranged on at least one of the four side surfaces; wherein when each light-emitting element emits light, the second electrode of the respective electrically controlled capsule is operative to attract the respective black particles so that the respective black particles are located on at least one of the four side surfaces of the electrically controlled capsule, and so the electrically controlled capsule is in the first state; and wherein when each light-emitting element does not emit light, the first electrode of the respective electrically controlled capsule is operative to attract the respective black particles so that the respective black particles are located on the light exit surface of the electrically controlled capsule, and so the electrically controlled capsule is in the second state.

3 . The display panel recited in claim 2 , wherein an area of each first electrode is equal to an area of the light exit surface of the respective electrically controlled capsule, and wherein an area of each second electrode is less than an area of the corresponding side surface of the respective electrically controlled capsule.

4 . The display panel recited in claim 1 , wherein there is further disposed a plurality of colored particles in each electrically controlled capsule, and wherein the plurality of colored particles in each electrically controlled capsule have a same color;
wherein each electrically controlled capsule layer further comprises a black matrix, and wherein every two adjacent electrically controlled capsules are separated by the black matrix; wherein the electrically controlled capsule and the black matrix are disposed in a same layer.

5 . The display panel recited in claim 4 , wherein a number of the plurality of black particles is less than a number of the plurality of colored particles in each same electrically controlled capsule.

6 . The display panel recited in claim 4 , wherein in each same electrically controlled capsule, the plurality of colored particles have a different charge polarity than the charge polarity of the plurality of black particles.

7 . The display panel recited in claim 6 , wherein each electrically controlled capsule comprises a third electrode, a fourth electrode, and at least two fifth electrodes;
wherein each electrically controlled capsule comprises a light exit surface, four side surfaces connected to the light exit surface, and a light-incident surface opposite to the light exit surface; wherein the third electrode is disposed on the light exit surface, the fourth electrode is arranged on the light-incident surface, and each of the at least two fifth electrodes is disposed on a respective one of the four side surfaces; wherein when each light-emitting element emits light, the at least two fifth electrodes of the respective electrically controlled capsule are operative to attract the respective black particles so that the respective black particles are located on the corresponding side surfaces of the respective electrically controlled capsule, and wherein the third electrode and the fourth electrode are operative to attract the respective colored particles so that the respective colored particles are located on the light incident surface and the light exit surface of the respective electrically controlled capsule, and wherein at this time the electrically controlled capsule is in the first state; wherein when each light-emitting element does not emit light, the at least two fifth electrodes of the respective electrically controlled capsule are operative to attract the respective colored particles so that the respective colored particles are located on the corresponding side surfaces of the respective electrically controlled capsule, and wherein the third electrode and the fourth electrode are operative to attract the respective black particles so that the respective black particles are located on the light exit surface and the light incident surface of the respective electrically controlled capsule, and wherein at this time the electrically controlled capsule is in the second state.

8 . The display panel recited in claim 7 , wherein the third electrode and the fourth electrode have a same polarity but different voltages; and wherein the at least two fifth electrodes have a same polarity but different voltages.

9 . The display panel recited in claim 4 , wherein each black matrix further comprises a light shielding piece at a position adjacent to the respective electrically controlled capsule;
wherein each electrically controlled capsule comprises a display portion and a non-display portion disposed around the display portion, wherein a projection of the non-display portion on the substrate overlaps a projection of the light shielding piece on the substrate; wherein when each electrically controlled capsule is in the first state, the respective black particles of the electrically controlled capsule are located in the non-display portion, and wherein when each electrically controlled capsule is in the second state, the respective black particles of the electrically controlled capsule are located in the display portion.

10 . The display panel recited in claim 9 , wherein a side of each electrically controlled capsule facing away from the substrate is lower than a side of the respective black matrix facing away from the substrate.

11 . The display pane

Assignees

• Hkc Corp Ltd

Inventors

• Li Yao
• Ye Lidan

Classifications

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/50

  OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal 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

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title

• G02F1/1685

  Operation of cells; Circuit arrangements affecting the entire cell · CPC title