Double-sided display device

Patent metadata

Field	Value
Publication number	US-12306523-B1
Application number	US-202318393500-A
Country	US
Kind code	B1
Filing date	Dec 21, 2023
Priority date	Nov 2, 2023
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A double-sided display device includes a transparent self-luminous display panel, a switching panel and a projection device. The transparent self-luminous display panel has a light-emitting side and a backside opposite to the light-emitting side. The switching panel is disposed on the backside of the transparent self-luminous display panel. The switching panel includes a first electrode, a second electrode and a liquid crystal layer disposed between the first electrode and the second electrode. The first electrode and the second electrode are configured to control liquid crystal molecules in the liquid crystal layer so that the switching panel includes a scattering state and a transparent state. The projection device is configured to project toward the light-emitting side of the transparent self-luminous display panel.

First claim

What is claimed is:

1. A double-sided display device, comprising:
a transparent self-luminous display panel having a light-emitting side and a backside opposite to the light-emitting side;
a switching panel disposed on the backside of the transparent self-luminous display panel, wherein the switching panel comprises:
a first electrode;
a second electrode; and
a liquid crystal layer disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are disposed to control liquid crystal molecules in the liquid crystal layer so that the switching panel comprises a scattering state and a transparent state; and

a projection device disposed to project toward the light-emitting side of the transparent self-luminous display panel; wherein
the double-sided display device is configured to operate in a transparent mode, a shielding mode, an augmented reality mode, a single-sided display mode or a double-sided display mode;
in the transparent mode, the transparent self-luminous display panel and the projection device are turned off, and the switching panel is switched to the transparent state;
in the shielding mode, the transparent self-luminous display panel and the projection device are turned off, and the switching panel is switched to the scattering state, wherein a transmittance of the double-sided display device in the shielding mode is lower than a transmittance of the double-sided display device in the transparent mode;
in the augmented reality mode, the transparent self-luminous display panel is turned on, the projection device is turned off and the switching panel is switched to the transparent state;
in a single-sided display mode, the transparent self-luminous display panel is turned on, the projection device is turned off and the switching panel is switched to the scattering state; and
in a double-sided display mode, the transparent self-luminous display panel and the projection device are turned on, and the switching panel is switched to the scattering state;

wherein the transparent self-luminous display panel comprises a transparent substrate, and the first electrode directly disposed on the backside of the transparent substrate.

2. The double-sided display device of claim 1 , wherein a haze of the switching panel in the scattering state is greater than 80%, and a haze of the switching panel in the transparent state is less than 15%.

3. The double-sided display device of claim 1 , wherein a transmittance of the switching panel in the transparent state is greater than 50%, and a transmittance of the switching panel in the scattering state is less than 50%.

4. The double-sided display device of claim 1 , wherein in the double-sided display mode, the projection device projects toward the light-emitting side of the transparent self-luminous display panel, wherein a light emitted by the projection device passes through a transmitting region of the transparent self-luminous display panel, and forms an image on the switching panel in the scattering state.

5. The double-sided display device of claim 1 , further comprising:
an outer transparent cover, wherein the switching panel is disposed between the outer transparent cover and the transparent self-luminous display panel.

6. The double-sided display device of claim 1 , wherein the liquid crystal molecules of the liquid crystal layer comprise cholesteric liquid crystal, and the liquid crystal layer further comprises a dichroic dye.

7. The double-sided display device of claim 1 , wherein the liquid crystal layer comprises a dichroic dye mixed with the liquid crystal molecules, and the liquid crystal layer further comprises a polymer dispersed liquid crystal film (PDLC film).

8. The double-sided display device of claim 1 , wherein the transparent self-luminous display panel comprises:
a light-absorbing layer located on the transparent substrate and defines a non-transmitting region and a transmitting region, wherein the first electrode, the liquid crystal layer and the second electrode of the switching panel overlap the non-transmitting region and the transmitting region;
a circuit structure located in the non-transmitting region of the transparent self-luminous display panel; and
a plurality of light-emitting diodes disposed on the circuit structure and located in the non-transmitting region of the transparent self-luminous display panel, wherein the plurality of light-emitting diodes are further away from the switching panel than the transparent substrate.

9. The double-sided display device of claim 8 , wherein the first electrode directly contacts the backside of the transparent substrate.

Assignees

• Auo Corp

Inventors

• Tseng Heng Yi
• Tien Kun-Cheng
• Wu Chih-Kang

Classifications

• G02B27/0101

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G02F2201/44

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

• G03B21/60 Primary

  characterised by the nature of the surface · CPC title

• G02F1/13

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title

• G09F9/302 Primary

  characterised by the form or geometrical disposition of the individual elements · CPC title