# US 10,121,992 B2 · Transparent displaying apparatus

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- Number: US 10,121,992 B2
- Document ID: US10121992B2
- Status: Granted
- Kind: B2
- Application number: 15/031,750
- Filed: 2016-02-26
- Published: 2018-02-15
- Granted: 2018-11-06
- Earliest claimed: 2016-01-07
- Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Inventors: Guoren Hu
- Web page: https://patentgrep.com/patent/US10121992B2

## CPC

- G02F 1/1347: Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/50: OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
- H10K 77/10: Substrates, e.g. flexible substrates
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G09G 3/36: using liquid crystals
- H10K 59/1201: {Manufacture or treatment}
- H10K 59/30: Devices specially adapted for multicolour light emission
- H10K 59/8051: {Anodes}
- H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- H10K 2102/00: Constructional details relating to the organic devices covered by this subclass
- Y02E 10/549: Organic PV cells
- 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
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention provides a transparent displaying apparatus, which includes a transparent display (30/40) and a liquid crystal twisting layer (20) arranged on a back surface of the transparent display (30/40). The liquid crystal twisting layer (20) includes therein liquid crystal molecules that selectively exhibit two states of arrangement including a first one of being substantially perpendicular to the transparent display (30/40) and a second one of being substantially parallel to the transparent display (30/40). When the liquid crystal molecules of the liquid crystal twisting layer (20) are arranged perpendicular to the transparent display (30/40), the liquid crystal twisting layer (20) is in a transparent state, such that a viewer may see, on a display screen of the transparent display (30/40), background scenery on the backside of the transparent displaying apparatus; and when the liquid crystal molecules of the liquid crystal twisting layer (20) are arranged parallel to the transparent display (30/40), the liquid crystal twisting layer (20) is in a non-transparent state, such that a viewer does not see, on the display screen of the transparent display (30/40), the background scenery on the backside of the transparent displaying apparatus and, compared to the transparent state of the liquid crystal twisting layer (20), the display screen of the transparent display (30/40) in this state shows relatively high displaying contrast, providing a better effect of displaying.

## Claims

### Claim 1

A transparent displaying apparatus, comprising a transparent display and a liquid crystal twisting layer arranged on a back surface of the transparent display, the liquid crystal twisting layer comprising therein liquid crystal molecules that selectively exhibit a first state of arrangement of being substantially perpendicular to the transparent display and a second state of arrangement of being substantially parallel to the transparent display, wherein when the liquid crystal molecules of the liquid crystal twisting layer are arranged perpendicular to the transparent display, the liquid crystal twisting layer is in a transparent state, which is adapted to allow a viewer to see, on a display screen of the transparent display, background scenery on a backside of the transparent displaying apparatus; and when the liquid crystal molecules of the liquid crystal twisting layer are arranged parallel to the transparent display, the liquid crystal twisting layer is in a non-transparent state, which prevents a viewer from seeing, on the display screen of the transparent display, the background scenery on the backside of the transparent displaying apparatus so as to allow the display screen of the transparent display to show relatively high displaying contrast as compared to the transparent state of the liquid crystal twisting layer;
wherein the transparent display has a front surface on which the display screen is arranged to display an image toward the viewer located in a front side of the transparent display that is opposite to the backside and facing the front surface of the transparent display, the back surface of the transparent display being opposite to the front surface and facing the backside and adapted to receive backside light carrying the background scenery to irradiate thereon;
wherein the liquid crystal twisting layer that is arranged on the back surface of the transparent display is switchable between the first state of arrangement and the second state of arrangement, wherein in the first state of arrangement, the liquid crystal twisting layer is of the transparent state in which the backside light irradiating on the back surface of the transparent display passes through the liquid crystal twisting layer to transmit toward and subsequently pass through the transparent display and in the second state of arrangement, the liquid twisting layer is of the non-transparent state in which the backside light irradiating on the back surface of the transparent display is blocked by the liquid crystal twisting layer from further transmitting toward and passing through the transparent display; and
wherein the liquid crystal twisting layer forms a separate light blocking device that is additionally attached to the back surface of the transparent device.

### Claim 2 (depends on 1)

The transparent displaying apparatus as claimed in claim 1, wherein the liquid crystal twisting layer covers the entirety of the back surface of the transparent display or a portion of the back surface.

### Claim 3 (depends on 1)

The transparent displaying apparatus as claimed in claim 1, wherein the liquid crystal twisting layer comprises a first substrate and a second substrate that are opposite to each other, a liquid crystal layer interposed between the first substrate and the second substrate, a first electrode arranged on a surface of the first substrate that faces the liquid crystal layer, and a second electrode arranged on a surface of the second substrate that faces the liquid crystal layer, wherein when no voltage is applied to the first electrode and the second electrode, liquid crystal molecules of the liquid crystal layer are substantially parallel to the transparent display and the liquid crystal layer is in the non-transparent state; and when a voltage is applied to the first electrode and the second electrode, the liquid crystal molecules of the liquid crystal layer are substantially perpendicular to the transparent display and the liquid crystal layer is in the transparent state.

### Claim 4 (depends on 3)

The transparent displaying apparatus as claimed in claim 3, wherein the first substrate and the second substrate are both transparent glass or plastic plates; and the first electrode and the second electrode are both transparent electrodes and the transparent electrodes are made of a material of transparent metal oxides.

### Claim 5 (depends on 4)

The transparent displaying apparatus as claimed in claim 4, wherein the transparent metal oxides comprise one or more of indium tin oxides, indium zinc oxides, aluminum tin oxides, aluminum zinc oxides, and indium germanium oxides.

### Claim 6 (depends on 1)

The transparent displaying apparatus as claimed in claim 1, wherein the transparent display comprises a transparent organic light-emitting diode (OLED) display or a transparent liquid crystal display (LCD).

### Claim 7 (depends on 6)

The transparent displaying apparatus as claimed in claim 6, wherein the transparent OLED display comprises a thin-film transistor array substrate, a packaging structure, and an OLED arranged between the thin-film transistor array substrate and the packaging structure; and the OLED comprises an anode, a cathode and an organic function layer located between the anode and the cathode, the organic function layer comprising at least an organic emissive layer.

### Claim 8 (depends on 7)

The transparent displaying apparatus as claimed in claim 7, wherein the organic function layer further comprises one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

### Claim 9 (depends on 6)

The transparent displaying apparatus as claimed in claim 6, wherein the transparent LCD comprises a liquid crystal display panel, top and bottom polarizers respectively arranged on top and bottom of the liquid crystal display panel, and a backlight module arranged under the liquid crystal display panel, the liquid crystal display panel comprising a color filter substrate and a thin-film transistor substrate that are opposite to each other and a liquid crystal layer interposed between the color filter substrate and the thin-film transistor substrate.

### Claim 10 (depends on 9)

The transparent displaying apparatus as claimed in claim 9, wherein the backlight module is one of a side-edge backlight module and a direct backlight module, wherein the side-edge backlight module comprises a backlight source and a light guide plate arranged sideward of the backlight source; and the direct backlight module comprises a backlight source and a diffusion plate arranged above the backlight source.

### Claim 11

A transparent displaying apparatus, comprising a transparent display and a liquid crystal twisting layer arranged on a back surface of the transparent display, the liquid crystal twisting layer comprising therein liquid crystal molecules that selectively exhibits a state of arrangement of being substantially perpendicular to the transparent display and a state of arrangement of being substantially parallel to the transparent display, wherein when the liquid crystal molecules of the liquid crystal twisting layer are arranged perpendicular to the transparent display, the liquid crystal twisting layer is in a transparent state, which is adapted to allow a viewer to see, on a display screen of the transparent display, background scenery on a backside of the transparent displaying apparatus; and when the liquid crystal molecules of the liquid crystal twisting layer are arranged parallel to the transparent display, the liquid crystal twisting layer is in a non-transparent state, which prevents a viewer from seeing, on the display screen of the transparent display, the background scenery on the backside of the transparent displaying apparatus so as to allow the display screen of the transparent display to show relatively high displaying contrast as compared to the transparent state of the liquid crystal twisting layer;
wherein the transparent display has a front surface on which the display screen is arranged to display an image toward the viewer located in a front side of the transparent display that is opposite to the backside and facing the front surface of the transparent display, the back surface of the transparent display being opposite to the front surface and facing the backside and adapted to receive backside light carrying the background scenery to irradiate thereon;
wherein the liquid crystal twisting layer that is arranged on the back surface of the transparent display is switchable between the first state of arrangement and the second state of arrangement, wherein in the first state of arrangement, the liquid crystal twisting layer is of the transparent state in which the backside light irradiating on the back surface of the transparent display passes through the liquid crystal twisting layer to transmit toward and subsequently pass through the transparent display and in the second state of arrangement, the liquid twisting layer is of the non-transparent state in which the backside light irradiating on the back surface of the transparent display is blocked by the liquid crystal twisting layer from further transmitting toward and passing through the transparent display;
wherein the liquid crystal twisting layer forms a separate light blocking device that is additionally attached to the back surface of the transparent device;
wherein the liquid crystal twisting layer covers the entirety of the back surface of the transparent display or a portion of the back surface;
wherein the liquid crystal twisting layer comprises a first substrate and a second substrate that are opposite to each other, a liquid crystal layer interposed between the first substrate and the second substrate, a first electrode arranged on a surface of the first substrate that faces the liquid crystal layer, and a second electrode arranged on a surface of the second substrate that faces the liquid crystal layer, wherein when no voltage is applied to the first electrode and the second electrode, liquid crystal molecules of the liquid crystal layer are substantially parallel to the transparent display and the liquid crystal layer is in the non-transparent state; and when a voltage is applied to the first electrode and the second electrode, the liquid crystal molecules of the liquid crystal layer are substantially perpendicular to the transparent display and the liquid crystal layer is in the transparent state; and
wherein the transparent display comprises a transparent organic light-emitting diode (OLED) display or a transparent liquid crystal display (LCD).

### Claim 12 (depends on 11)

The transparent displaying apparatus as claimed in claim 11, wherein the first substrate and the second substrate are both transparent glass or plastic plates; and the first electrode and the second electrode are both transparent electrodes and the transparent electrodes are made of a material of transparent metal oxides.

### Claim 13 (depends on 12)

The transparent displaying apparatus as claimed in claim 12, wherein the transparent metal oxides comprise one or more of indium tin oxides, indium zinc oxides, aluminum tin oxides, aluminum zinc oxides, and indium germanium oxides.

### Claim 14 (depends on 11)

The transparent displaying apparatus as claimed in claim 11, wherein the transparent OLED display comprises a thin-film transistor array substrate, a packaging structure, and an OLED arranged between the thin-film transistor array substrate and the packaging structure; and the OLED comprises an anode, a cathode and an organic function layer located between the anode and the cathode, the organic function layer comprising at least an organic emissive layer.

### Claim 15 (depends on 14)

The transparent displaying apparatus as claimed in claim 14, wherein the organic function layer further comprises one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

### Claim 16 (depends on 11)

The transparent displaying apparatus as claimed in claim 11, wherein the transparent LCD comprises a liquid crystal display panel, top and bottom polarizers respectively arranged on top and bottom of the liquid crystal display panel, and a backlight module arranged under the liquid crystal display panel, the liquid crystal display panel comprising a color filter substrate and a thin-film transistor substrate that are opposite to each other and a liquid crystal layer interposed between the color filter substrate and the thin-film transistor substrate.

### Claim 17 (depends on 16)

The transparent displaying apparatus as claimed in claim 16, wherein the backlight module is one of a side-edge backlight module and a direct backlight module, wherein the side-edge backlight module comprises a backlight source and a light guide plate arranged sideward of the backlight source; and the direct backlight module comprises a backlight source and a diffusion plate arranged above the backlight source.