# US 12,111,465 B2 · Display device

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- Number: US 12,111,465 B2
- Document ID: US12111465B2
- Status: Granted
- Kind: B2
- Application number: 17/594,508
- Filed: 2020-05-22
- Published: 2022-06-30
- Granted: 2024-10-08
- Earliest claimed: 2019-05-29
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Kentaro Tamura
- Web page: https://patentgrep.com/patent/US12111465B2

## CPC

- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- B60K 35/23: Head-up displays [HUD] (optical aspects of head-up displays G02B27/01)
- B60K 35/60: Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10)
- G02B 5/208: {for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation}
- G02B 5/26: Reflecting filters (G02B5/28 takes precedence)
- B60K 35/28: characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
- B60K 2360/23: using reflectors
- B60K 2360/785: on or in relation to the windshield or windows
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

The present application provides a display device that easily reduces an incident amount of an infrared light to a display portion on the basis of maintaining visual confirmation of display information. A display device according to one scheme of the present disclosure comprises: a display portion emitting a visible light of a linearly polarized wave having display information; an infrared light cut-off portion transmitting the visible light from the display portion and reducing an incident amount of an infrared light to the display portion; and a reflecting portion reflecting the visible light transmitted from the infrared light cut-off portion, wherein the infrared light cut-off portion comprises an infrared light cut-off layer, the infrared light cut-off layer has a slow axis, and the slow axis is generally parallel to a vibration direction of the linearly polarized wave.

## Claims

### Claim 1

A display device, characterized in that the display device comprises:
a display portion emitting a visible light of a linearly polarized wave having display information;
an infrared light cut-off portion transmitting the visible light from the display portion and reducing an incident amount of an infrared light to the display portion; and
a reflecting portion reflecting the visible light transmitted through the infrared light cut-off portion,
wherein the infrared light cut-off portion comprises an infrared light cut-off layer,
the infrared light cut-off layer has a slow axis, and
the slow axis is generally parallel to a vibration direction of the linearly polarized wave.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the term “generally parallel” means that an angle formed by the slow axis and the vibration direction of the linearly polarized wave is greater than 0 degree and less than 10 degrees.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein an incidence angle of the linearly polarized wave with respect to the infrared light cut-off portion is greater than 0 degree and less than 90 degrees.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein the infrared light cut-off portion further comprises an ultra-violet light cut-off layer reducing a transmittance of an ultra-violet light, and
the infrared light cut-off layer and the ultra-violet light cut-off layer both have transmissivity in a visible light region.

### Claim 5 (depends on 4)

The display device according to claim 4, wherein the transmissivity has a transmittance greater than 60% in the visible light region.

### Claim 6 (depends on 4)

The display device according to claim 4, wherein the infrared light cut-off portion comprises a hard coating.

### Claim 7 (depends on 4)

The display device according to claim 4, wherein the ultra-violet light cut-off layer is an adhesive layer.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein the display device further comprises a window portion assembled on an opening provided in an instrument board of a vehicle, and disposed between the display portion and the reflecting portion on a light path of the visible light, and
the infrared light cut-off portion is provided between the window portion and the reflecting portion.

### Claim 9 (depends on 1)

The display device according to claim 1, wherein the display device further comprises a window portion assembled on an opening provided in an instrument board of a vehicle, and disposed between the display portion and the reflecting portion on a light path of the visible light, and the infrared light cut-off portion is provided between the display portion and the window portion.