Display unit, display panel, display device and optical information storage device

Patent metadata

Field	Value
Publication number	US-10783345-B2
Application number	US-201815980605-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	Nov 21, 2017
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

Disclosed are a display unit, a display panel, a display device and an optical information storage device. The display unit comprises a photochromic thin film and an optical filter thin film on a side of the photochromic thin film. The photochromic thin film presents a colored state under an irradiation of a first preset light, and presents a transparent state under an irradiation of a second preset light. A wavelength range of the first preset light is different from that of the second preset light. The optical filter thin film is a one-way optical filter thin film that is substantially transparent to lights coming from a photochromic thin film side, and functions as an optical filter to lights coming from a side opposite the photochromic side to allow the first preset light to pass through and to reflect lights of other wavelengths.

First claim

What is claimed is:

1. A display panel, comprising:
a transparent cover plate;
a display unit comprising:
a photochromic thin film that is configured to present a colored state under an irradiation of a first preset light, and to present a transparent state under an irradiation of a second preset light, a wavelength range of the first preset light being different from that of the second preset light; and
an optical filter thin film on a side of the photochromic thin film, the optical filter thin film being a one-way optical filter thin film, which is substantially transparent to lights coming from a photochromic thin film side, but functioning as an optical filter to lights coming from the other side, only allowing the first preset light to be transmitted through and reflecting lights of other wavelengths; and

a light emitting unit for emitting the second preset light, on the photochromic thin film side of the display unit,
wherein the transparent cover plate is disposed on a side of the display unit close to the light emitting unit, and the photochromic thin film of the display unit is close to the transparent cover plate, such that the second preset light emitted by the light emitting unit is allowed to enter into the photochromic thin film via the transparent cover plate, and the first preset light is allowed to enter into the photochromic thin film via the optical filter thin film.

2. The display panel according to claim 1 , wherein the display panel further comprises:
a fingerprint identification sensor;
a semiconductor thin film; and
a protective layer;
wherein the semiconductor thin film and the protective layer are sequentially disposed on a side of the display unit away from the light emitting unit, and the fingerprint identification sensor is disposed between the transparent cover plate and the light emitting unit,
wherein the display unit coincides with a corresponding fingerprint identification area of the fingerprint identification sensor, so as to display the fingerprint identification area under the irradiation of the first preset light and to become a transparent state under the irradiation of the second preset light, and the semiconductor thin film is configured to have a structure of stripes separated with each other, so as to cooperate with the fingerprint identification sensor to achieve a fingerprint identification.

3. A display device comprising the display panel according to claim 1 .

4. The display panel according to claim 1 , wherein the display unit is positioned in a display area of the display panel.

5. The display panel according to claim 1 , wherein the display panel is a flexible display panel, and the cover plate is a flexible cover plate.

6. The display panel according to claim 5 , wherein the display panel is full screen without borders.

7. The display panel according to claim 1 , wherein the display unit is configured to be present in a plurality of groups, so as to cooperate with a preset control unit to achieve a corresponding control function.

8. The display panel according to claim 1 , wherein the photochromic thin film comprises a reversible photochromic material.

9. The display panel according to claim 8 , wherein the reversible photochromic material at least includes one of spirooxazines or spiropyrans or a mixture thereof, and wherein the first preset light is an ultraviolet light, and the second preset light is a visible light.

10. The display panel according to claim 1 , wherein the optical filter thin film has a laminated structure of multiple film layers with different refractive indexes.

11. A display panel, comprising:
a transparent cover plate;
a display unit comprising:
a photochromic thin film that is configured to present a colored state under an irradiation of a first preset light, and to present a transparent state under an irradiation of a second preset light, a wavelength range of the first preset light being different from that of the second preset light; and
an optical filter thin film on a side of the photochromic thin film, the optical filter thin film being a one-way optical filter thin film, which is substantially transparent to lights coming from a photochromic thin film side, but functioning as an optical filter to lights coming from the other side, only allowing the first preset light to be transmitted through and reflecting lights of other wavelengths; and

a light emitting unit for emitting the second preset light, on the photochromic thin film side of the display unit,
wherein the transparent cover plate is disposed on a side of the display unit away from the light emitting unit and the optical filter thin film of the display unit is close to the transparent cover plate, such that the second preset light emitted by the light emitting unit is allowed to enter into the photochromic thin film, and the first preset light is allowed to pass through the transparent cover plate and the optical filter thin film sequentially and enter into the photochromic thin film.

12. The display panel according to claim 11 ,
wherein a semiconductor thin film and a protective layer are sequentially disposed on a side of the transparent cover plate away from the light emitting unit, and a fingerprint identification sensor is disposed between the display unit and the light emitting unit; and
wherein the display unit coincides with a corresponding fingerprint identification area of the fingerprint identification sensor, so as to display the fingerprint identification area under the irradiation of the first preset light and to become a transparent state under the irradiation of the second preset light, and the semiconductor thin film is configured to have a structure of stripes separated with each other, so as to cooperate with the fingerprint identification sensor to achieve a fingerprint identification.

13. The display panel according to claim 11 , wherein the display unit is configured to be present in a plurality of groups, so as to cooperate with a preset control unit to achieve a corresponding control function.

14. A display device comprising the display device according to claim 11 .

15. The display panel according to claim 11 , wherein the display unit is positioned in a display area of the display panel.

16. The display panel according to claim 11 , wherein the display panel is a flexible display panel, and the cover plate is a flexible cover plate.

17. The display panel according to claim 11 , wherein the display panel is full screen without borders.

18. The display panel according to claim 11 , wherein, the optical filter thin film has a laminated structure of multiple film layers with different refractive indexes.

19. The display panel according to claim 11 , wherein the photochromic thin film comprises a reversible photochromic material.

20. The display panel according to claim 19 , wherein the reversible photochromic material at least includes one of spirooxazines or spiropyrans or a mixture thereof, and wherein the first preset light is an ultraviolet light, and the second preset light is a visible light.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Du Shuang
• Tsai Pao Ming
• Bu Dejun
• Liu Lu
• Chen Liqiang

Classifications

• G06V40/1318

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• G02B5/23 Primary

  Photochromic filters · CPC title

• H10F39/198

  Contact-type image sensors [CIS] · CPC title

• G09F9/301

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title

• G09F9/00 Primary

  Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) · CPC title