# US 2014/0192296 A1 · Transparent display device

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- Number: US 2014/0192296 A1
- Document ID: US20140192296A1
- Status: Published application
- Kind: A1
- Application number: 13/813,924
- Filed: 2013-01-09
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Shenzhen China Star Optoelectronics Techonology Co., Ltd
- Applicants: Shenzhen China Star Optoelectronics Techonology Co., Ltd.
- Inventors: Chiachiang Hsiao; Chihwen Chen
- Web page: https://patentgrep.com/patent/US20140192296A1

## CPC

- G02F 1/133533: {Colour selective polarisers (G02F1/1347 takes precedence)}
- G02F 1/13471: {in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells (G02F1/13475 takes precedence)}
- G02F 1/13473: {for wavelength filtering or for colour display without the use of colour mosaic filters}
- G02F 1/13718: {based on a change of the texture state of a cholesteric liquid crystal}
- G02F 1/133541: {Circular polarisers}
- G02F 1/133638: {Waveplates, i.e. plates with a retardation value of lambda/n}
- G02F 2203/34: Colour display without the use of colour mosaic filters
- G02F 2413/02: Number of plates being 2
- 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

A transparent display device includes a cholesteric liquid crystal display (LCD) panel to display an image, a first polarized sheet arranged on one side of the cholesteric LCD panel, and a first ¼ phase delay sheet arranged between the first polarized sheet and the display panel.

## Claims

### Claim 1

A transparent display device, comprising;
a cholesteric liquid crystal display (LCD) panel that displays an image;
a first polarized sheet arranged on one side of the cholesteric LCD panel;
a second polarized sheet arranged on another side of the cholesteric LC display panel;
a first ¼ phase delay sheet arranged between the first polarized sheet and the display panel;
a second ¼ phase delay sheet arranged between the second polarized sheet and the display panel; and
a ½ phase-difference LC layer arranged between the second phase delay sheet and the display panel; wherein the ½ phase-difference LC layer configured with a diverter switch that switches between a ½ phase delay state and a no-phase delay state;
wherein the cholesteric LCD panel is a multicolor LCD panel; the cholesteric LCD panel comprises a LC panel, wherein red, green and blue cholesteric LC picture elements are used in the LC panel.

### Claim 2

A transparent display device, comprising:
a cholesteric liquid crystal display (LCD) panel that displays an image;
a first polarized sheet arranged on one side of the cholesteric LCD panel; and
a first ¼ phase delay sheet arranged between the first polarized sheet and the display panel.

### Claim 3 (depends on 2)

The transparent display device of claim 2, wherein another side of the cholesteric liquid crystal display (LCD) panel is configured with a second polarized sheet and a second ¼ phase delay sheet; the second ¼ phase delay sheet is arranged between the cholesteric LCD panel and the second polarized sheet; an included angle between a polarized direction of the first polarized sheet and a polarized direction of the second polarized sheet is 90 degrees.

### Claim 4 (depends on 3)

The transparent display device of claim 3, wherein a ½ phase delay device is arranged between the second polarized sheet and the cholesteric LCD panel; the ½ phase delay device is configured with a diverter switch that switches between a ½ phase delay state and a no-phase delay state.

### Claim 5 (depends on 4)

The transparent display device of claim 4, wherein the ½ phase delay device is arranged between the second ¼ phase delay sheet and the cholesteric LCD panel.

### Claim 6 (depends on 4)

The transparent display device of claim 4, wherein the ½ phase delay device is arranged between the second ¼ phase delay sheet and the second polarized sheet.

### Claim 7 (depends on 4)

The transparent display device of claim 4, wherein the ½ phase delay device is a ½ phase difference LC layer; the diverter switch is a driving switch that controls an LC deflection of the ½ phase difference LC layer.

### Claim 8 (depends on 2)

The transparent display device of claim 2, wherein the cholesteric LCD panel is a monochromatic LCD panel.

### Claim 9 (depends on 2)

The transparent, display device of claim 2, wherein the cholesteric LCD panel is a multicolor LCD panel.

### Claim 10 (depends on 2)

The transparent display device of claim 2, wherein the cholesteric liquid crystal display (LCD) panel comprises a LC panel; wherein red, green and blue cholesteric LC picture elements are used in the LC panel.

### Claim 11 (depends on 2)

The transparent display device of claim 2, wherein the cholesteric LCD panel comprises three LC panels made with red, green and blue cholesteric LCs, respectively.