# US 2023/0068076 A1 · Dual-sided imaging thin film display structure

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- Number: US 2023/0068076 A1
- Document ID: US20230068076A1
- Status: Published application
- Kind: A1
- Application number: 17/488,742
- Filed: 2021-09-29
- Published: 2023-03-02
- Earliest claimed: 2021-08-30
- Assignees: Interface Technology (ChengDu) Co., Ltd.; Interface Optoelectronics (Shenzhen) Co., Ltd.; Interface Optoelectronics (Wuxi) Co., Ltd.; General Interface Solution Limited
- Applicants: Interface Technology (Chengdu) Co., Ltd.; Interface Optoelectronics (Shenzhen) Co., Ltd.; Interface Optoelectronics (Wuxi) Co., Ltd.; General Interface Solution Limited
- Inventors: CHE WEN CHIANG; PO LUN CHEN
- Web page: https://patentgrep.com/patent/US20230068076A1

## CPC

- H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces
- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- G02F 1/0136: {for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation (G02F1/0353 takes precedence)}
- G02F 1/133509: {Filters, e.g. light shielding masks}
- G02F 1/133528: {Polarisers}
- G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)}
- G02F 1/133555: {Transflectors}
- H10H 20/856: Reflecting means
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- B32B 2307/42: Polarizing, birefringent, filtering
- G02B 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)}
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10W 90/00: Package configurations
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A dual-sided imaging thin film display structure is provided, comprising a light source, a reflective polarizing element, a basing layer and a linear polarizing element. The reflective polarizing element is disposed on a front surface of the light source, the basing layer is disposed on a back surface of the light source, and the linear polarizing element is further disposed behind the basing layer. A transmission axis of the reflective polarizing element and that of the linear polarizing element are orthogonal, such that a light beam emitted from the light source passes through the reflective polarizing element to form a front image, be reflected by the reflective polarizing element, and passes through the linear polarizing element to form a back image. By employing the present invention, it achieves to provide dual-sided images and interferences between the images are suppressed to obtain superior imaging quality and resolution.

## Claims

### Claim 1

A dual-sided imaging thin film display structure, comprising:
a light source, including a front surface and a back surface which is opposite to the front surface;
a reflective polarizing element, being disposed on the front surface of the light source;
a basing layer, being disposed on the back surface of the light source and including a substrate and at least one trace configuration layer; and
a linear polarizing element, being disposed behind the basing layer, wherein a transmission axis of the reflective polarizing element and that of the linear polarizing element are orthogonal, such that a light beam emitted from the light source passes through the reflective polarizing element to form a front image, be reflected by the reflective polarizing element, and passes through the linear polarizing element to form a back image.

### Claim 2 (depends on 1)

The dual-sided imaging thin film display structure according to claim 1, wherein the at least one trace configuration layer is disposed on an upper surface of the substrate, such that the at least one trace configuration layer is configured between the light source and the substrate.

### Claim 3 (depends on 1)

The dual-sided imaging thin film display structure according to claim 1, wherein the at least one trace configuration layer is disposed on a lower surface of the substrate, such that the at least one trace configuration layer is configured between the substrate and the linear polarizing element.

### Claim 4 (depends on 1)

The dual-sided imaging thin film display structure according to claim 1, wherein the at least one trace configuration layer of the basing layer comprises a first trace configuration layer and a second trace configuration layer, which are respectively disposed on an upper surface of the substrate and on a lower surface of the substrate, such that the first trace configuration layer is configured between the light source and the substrate, and the second trace configuration layer is configured between the substrate and the linear polarizing element.

### Claim 5 (depends on 1)

The dual-sided imaging thin film display structure according to claim 1, wherein the light source comprises a plurality of light-emitting diodes (LED) for emitting the light beam, the light beam includes a first polarization direction and a second polarization direction, the first polarization direction and the second polarization direction are orthogonal, and the plurality of light-emitting diodes switch the first polarization direction and the second polarization direction alternatively.

### Claim 6 (depends on 5)

The dual-sided imaging thin film display structure according to claim 5, wherein when the reflective polarizing element permits the light beam in the first polarization direction to pass through, the front image is formed by the light beam in the first polarization direction.

### Claim 7 (depends on 6)

The dual-sided imaging thin film display structure according to claim 6, wherein the back image is formed by the light beam in the second polarization direction.

### Claim 8 (depends on 5)

The dual-sided imaging thin film display structure according to claim 5, wherein when the reflective polarizing element permits the light beam in the second polarization direction to pass through, the front image is formed by the light beam in the second polarization direction.

### Claim 9 (depends on 8)

The dual-sided imaging thin film display structure according to claim 8, wherein the back image is formed by the light beam in the first polarization direction.

### Claim 10 (depends on 5)

The dual-sided imaging thin film display structure according to claim 5, wherein the light beam emitted from the light source firstly passes through the reflective polarizing element to fonn the front image, subsequently the light beam is reflected by the reflective polarizing element and then passes through the linear polarizing element to form the back image, such that a time difference is generated between forming the front image and forming the back image.

### Claim 11 (depends on 10)

The dual-sided imaging thin film display structure according to claim 10, wherein when a frame rate of the front image and the back image is greater than 120 frames per second, the time difference is less than 0.008 second.

### Claim 12 (depends on 5)

The dual-sided imaging thin film display structure according to claim 5, wherein when the light beam in the first polarization direction is S-polarized light, the light beam in the second polarization direction is P-polarized light, or wherein when the light beam in the first polarization direction is P-polarized light, the light beam in the second polarization direction is S-polarized light.

### Claim 13 (depends on 1)

The dual-sided imaging thin film display structure according to claim 1, wherein the light source comprises a plurality of light-emitting diodes (LED) composed of a first group of light-emitting diodes and a second group of light-emitting diodes, the light beam emitted from the first group of light-emitting diodes is in a first polarization direction, the light beam emitted from the second group of light-emitting diodes is in a second polarization direction, and the first polarization direction and the second polarization direction are orthogonal.

### Claim 14 (depends on 13)

The dual-sided imaging thin film display structure according to claim 13, wherein the first group of light-emitting diodes and the second group of light-emitting diodes are turned on simultaneously, such that the front image is formed by the light beam in the first polarization direction and the back image is formed by the light beam in the second polarization direction.

### Claim 15 (depends on 14)

The dual-sided imaging thin film display structure according to claim 14, wherein the front image and the back image are formed simultaneously, such that no time difference is generated between forming the front image and forming the back image.

### Claim 16 (depends on 13)

The dual-sided imaging thin film display structure according to claim 13, wherein when the light beam in the first polarization direction is S-polarized light, the light beam in the second polarization direction is P-polarized light, or wherein when the light beam in the first polarization direction is P-polarized light, the light beam in the second polarization direction is S-polarized light.

### Claim 17 (depends on 13)

The dual-sided imaging thin film display structure according to claim 13, wherein either the first group of light-emitting diodes or the second group of light-emitting diodes is turned on, such that either the front image or the back image is formed.

### Claim 18 (depends on 17)

The dual-sided imaging thin film display structure according to claim 17, wherein when only the first group of light-emitting diodes is turned on and the reflective polarizing element permits the light beam in the first polarization direction to pass through, the front image is formed by the light beam in the first polarization direction.

### Claim 19 (depends on 17)

The dual-sided imaging thin film display structure according to claim 17, wherein when only the first group of light-emitting diodes is turned on and yet the reflective polarizing element only permits the light beam in the second polarization direction to pass through, then the light beam in the first polarization direction contributes to form the back image.

### Claim 20 (depends on 17)

The dual-sided imaging thin film display structure according to claim 17, wherein when only the second group of light-emitting diodes is turned on and the reflective polarizing element permits the light beam in the second polarization direction to pass through, the front image is formed by the light beam in the second polarization direction.

### Claim 21 (depends on 17)

The dual-sided imaging thin film display structure according to claim 17, wherein when only the second group of light-emitting diodes is turned on and yet the reflective polarizing element only permits the light beam in the first polarization direction to pass through, then the light beam in the second polarization direction contributes to form the back image.

### Claim 22 (depends on 1)

The dual-sided imaging thin film display structure according to claim 1, wherein the at least one trace configuration layer provides electrical power or data input to the light source, and the at least one trace configuration layer comprises a plurality of wires, and the plurality of wires are made of metal or non-metal.