Display panel and method for preparing the same, and method for adjusting intensity of ambient light reflected thereon

Patent metadata

Field	Value
Publication number	US-11340511-B2
Application number	US-201916956066-A
Country	US
Kind code	B2
Filing date	Oct 25, 2019
Priority date	Nov 2, 2018
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A display panel, a method for preparing a display panel and a method for adjusting an intensity of ambient light reflected on a display panel are provided in embodiments of the disclosure. The display panel includes: a base substrate; a plurality of sub-pixel units (20) on the base substrate comprising a plurality of light emitting portions respectively; an electrochromic assembly on a light-emergent side of the plurality of light emitting portions; and a light intensity detector configured to detect an incident intensity of ambient light, and the electrochromic assembly comprises a plurality of electrochromic portions covering the plurality of light emitting portions, respectively; and transmittance of the plurality of electrochromic portions for ambient light varies with a change in the incident intensity of ambient light.

First claim

What is claimed is:

1. A display panel, comprising:
a base substrate;
a plurality of sub-pixel units on the base substrate comprising a plurality of light emitting portions respectively;
an electrochromic assembly on a light-emergent side of the plurality of light emitting portions;
a light intensity detector configured to detect an incident intensity of ambient light; and
a liquid crystal adjustment assembly between the electrochromic assembly and the plurality of light emitting portions, or on a side of the electrochromic assembly distal to the plurality of light emitting portions; and
a circular polarizer on a side of one of the electrochromic assembly and the liquid crystal adjustment assembly which is more distal to the plurality of light emitting portions than the other, the side being distal to the plurality of light emitting portions,
wherein the electrochromic assembly comprises a plurality of electrochromic portions covering the plurality of light emitting portions, respectively; and
wherein the transmittance of the plurality of electrochromic portions for ambient light varies with a change in the incident intensity of ambient light.

2. The display panel according to claim 1 , wherein the electrochromic assembly further comprises:
a first electrode on one side of the plurality of electrochromic portions facing the plurality of light emitting portions; and
a second electrode on the other side of the plurality of electrochromic portions distal to the plurality of light emitting portions.

3. The display panel according to claim 2 , further comprising a controller, which is configured to modulate the plurality of electrochromic portions into a color rendering state by applying a first voltage between the first electrode and the second electrode in response to the incident intensity of ambient light higher than a first threshold, and to modulate the plurality of electrochromic portions into a transparent state by applying a second voltage between the first electrode and the second electrode in response to the incident intensity of ambient light lower than the first threshold,
wherein, as to each of the plurality of electrochromic portions, a transmittance thereof in the color rendering state for light in the predetermined wavelength range is higher than a transmittance thereof in the color rendering state for light having wavelengths other than in the predetermined wavelength range, but is lower than a transmittance thereof in the transparent state for light in the predetermined wavelength range.

4. The display panel according to claim 2 , wherein the electrochromic assembly further comprises: a second controllable switching device configured to apply a potential onto or remove a potential from the first electrode or the second electrode.

5. A method for adjusting an intensity of ambient light reflected on the display panel according to claim 2 , comprising:
detecting an incident intensity of ambient light;
comparing the incident intensity of ambient light as detected, with a first threshold;
modulating the plurality of electrochromic portions into a color rendering state by applying a first voltage between the first electrode and the second electrode in response to the incident intensity of ambient light which is higher than the first threshold, and modulating the plurality of electrochromic portions into a transparent state by applying a second voltage between the first electrode and the second electrode in response to the incident intensity of ambient light which is lower than the first threshold,
wherein, as to each of the plurality of electrochromic portions, a transmittance thereof in the color rendering state for light in the predetermined wavelength range is higher than a transmittance thereof in the color rendering state for light having wavelengths other than in the predetermined wavelength range, but is lower than a transmittance thereof in the transparent state for light in the predetermined wavelength range.

6. The method according to claim 5 , wherein the display panel further comprises:
a liquid crystal adjustment assembly between the electrochromic assembly and the plurality of light emitting portions, or on a side of the electrochromic assembly distal to the plurality of light emitting portions, the liquid crystal adjustment assembly comprising a liquid crystal layer, and a third electrode and a fourth electrode located on both sides of the liquid crystal layer respectively; and
a circular polarizer on a side of one of the electrochromic assembly and the liquid crystal adjustment assembly which is more distal to the plurality of light emitting portions than the other, the side being distal to the plurality of light emitting portions, and
wherein the method further comprises:
comparing the incident intensity of ambient light as detected, with a second threshold;
modulating the liquid crystal layer into a first state by applying a third voltage between the third electrode and the fourth electrode in response to the incident intensity of ambient light which is higher than the second threshold, and modulating the liquid crystal layer into a second state by applying a fourth voltage between the third electrode and the fourth electrode in response to the incident intensity of ambient light which is lower than the second threshold,
wherein, as to the liquid crystal layer, a polarization state of ambient light passing therethrough remains as original in the first state, but is changed thereby in the second state to an extent that an emission ratio of ambient light from the circular polarizer is higher in the second state than in the first state.

7. The display panel according to claim 1 , wherein the plurality of the electrochromic portions and the plurality of the light emitting portions are provided in one-to-one correspondence with each other, and an orthographic projection of each of the plurality of the electrochromic portions on the base substrate overlaps with an orthographic projection of a respective one of the plurality of the light emitting portions on the base substrate.

8. The display panel according to claim 7 , wherein each of the plurality of the electrochromic portions displays a color which is the same as that of light emitted by the respective one of the plurality of light emitting portions.

9. The display panel according to claim 1 , wherein the electrochromic assembly further comprises a light shielding portion located between any two adjacent electrochromic portions.

10. The display panel according to claim 1 , wherein the plurality of electrochromic portions comprise a first electrochromic portion formed by 1,1′-disubstituted-4,4′-dipyridyl, a second electrochromic portion formed by Rh 2 O 3 and a third electrochromic portion formed by IrO x .

11. The display panel according to claim 1 , wherein each of the plurality of light emitting portions comprises a cathode, an anode and a light emitting material layer between the cathode and the anode.

12. The display panel according to claim 1 , wherein the liquid crystal adjustment assembly comprises:
a liquid crystal layer;
a third electrode, on one side of the liquid crystal layer facing the plurality of light emitting portions; and
a fourth electrode, on the other side of the liquid crystal layer distal to the plurality of light emitting portions.

13. The display panel according to claim 12 , further comprising a controller, which is configured to modulate the liquid crystal layer into a first state by applying a third voltage between the third electrode and the fourth electrode in response to the incident intensity of ambient light higher than a secon

Assignees

• Boe Technology Group Co Ltd

Inventors

• Qin Wei
• Li Xiaolong
• Wang Tieshi
• Peng Jintao
• Gao Xueling
• Niu Yanan
• Peng Kuanjun
• Li Shengnan

Classifications

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• G02F1/155 Primary

  Electrodes · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• G02F1/29

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• G02F2203/62

  Switchable arrangements whereby the element being usually not switchable · CPC title