# US 2014/0152939 A1 · Transparent Display

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- Number: US 2014/0152939 A1
- Document ID: US20140152939A1
- Status: Published application
- Kind: A1
- Application number: 14/087,174
- Filed: 2013-11-22
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Miki KASHIMA
- Web page: https://patentgrep.com/patent/US20140152939A1

## CPC

- G02B 6/0001: {specially adapted for lighting devices or systems (lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00)}
- G02F 1/13718: {based on a change of the texture state of a cholesteric liquid crystal}
- G02F 1/1313: {specially adapted for a particular application}
- G02F 1/13362: {providing polarized light, e.g. by converting a polarisation component into another one}
- G02F 2201/343: cholesteric liquid crystal reflector
- G02F 2203/01: transmissive
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present invention provides a transparent display which comprises a light source; a first liquid crystal layer, for transmitting a first part of the light emitted from the light source and reflecting a second part of the light emitted from the light source; a light-transmittable image display device including a second liquid crystal layer, wherein the first part of the light is emitted to the second liquid crystal layer, when the image display device is in a first state, the first part of the light is transmitted through the second liquid crystal layer, and the image display device displays an image; when the image display device is in a second state, the first part of the light is reflected by the second liquid crystal layer, and the image display device becomes transparent. The transparent display according to the present invention can realize the function of a transparent display without use of a sheet polarizer or a light guide plate. Therefore, in comparison with the transparent display of the prior art, the transparent display according to the present invention has greatly-improved light transmittance.

## Claims

### Claim 1

A transparent display, comprising:
a light source;
a first liquid crystal layer, for transmitting a first part of the light emitted from the light source and reflecting a second part of the light emitted from the light source; and
a light-transmittable image display device including a second liquid crystal layer, wherein the first part of the light is emitted to the second liquid crystal layer, when the image display device is in a first state, the first part of the light is transmitted through the second liquid crystal layer, and the image display device displays an image; when the image display device is in a second state, the first part of the light is reflected by the second liquid crystal layer, and the image display device becomes transparent.

### Claim 2 (depends on 1)

The transparent display according to claim 1, wherein the light source is set between the first liquid crystal layer and the image display device, and one such light source is individually set on both side edges of the region between the first liquid crystal layer and the image display device.

### Claim 3 (depends on 1)

The transparent display according to claim 1, wherein a cholesteric-phase liquid crystal with a first screw pitch is formed on the first liquid crystal layer and the second liquid crystal layer, respectively.

### Claim 4 (depends on 3)

The transparent display according to claim 3, wherein the first liquid crystal layer and the second liquid crystal layer individually include a cholesteric-phase liquid crystal with a left-hand screw pitch structure, the first part of the light is a right-handed light, and the second part of the light is a left-handed light.

### Claim 5 (depends on 1)

The transparent display according to claim 1, wherein the image display device further comprises:
a first substrate with a first light transmittance including a color film layer; and
a second substrate with a second light transmittance including a thin-film transistor layer, wherein both the second substrate and the first substrate are set opposite to each other;
wherein the second liquid crystal layer is set between the first substrate and the second substrate.

### Claim 6 (depends on 1)

The transparent display according to claim 1, wherein when a voltage is applied to the second liquid crystal layer, the image display device will be in the first state; when no voltage is applied to the second liquid crystal layer, the image display device will be in the second state.

### Claim 7 (depends on 1)

The transparent display according to claim 1, wherein the first liquid crystal layer is set via a third substrate with a third light transmittance and a fourth substrate with a fourth light transmittance, and both the third substrate and the fourth substrate are opposite to each other.

### Claim 8 (depends on 3)

The transparent display according to claim 3, wherein the first liquid crystal layer and the second liquid crystal layer individually include a cholesteric-phase liquid crystal with a right-hand screw pitch structure, the first part of the light is a left-handed light, and the second part of the light is a right-handed light.