# US 10,768,464 B2 · Vehicle display device

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- Number: US 10,768,464 B2
- Document ID: US10768464B2
- Status: Granted
- Kind: B2
- Application number: 16/407,164
- Filed: 2019-05-08
- Published: 2019-11-14
- Granted: 2020-09-08
- Earliest claimed: 2018-05-11
- Assignees: Yazaki Corporation
- Applicants: Yazaki Corporation
- Inventors: Yuta Miyake; Kenji Yagi; Naohisa Murata; Hidetoshi Mukojima
- Web page: https://patentgrep.com/patent/US10768464B2

## CPC

- G02F 1/133382: {Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell}
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B 27/0149: {characterised by mechanical features (G02B27/0176 takes precedence)}
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A vehicle display device includes a display that emits a display image projected on a windshield provided outside as display light, two reflective mirrors that are disposed on a light path of the display light from the display to the windshield and reflect the display light, an optical sensor that detects the external light entering from an opening communicating between the outside and an internal space, and a controller configured to execute temperature decreasing operation of the display for decreasing a temperature thereof when the optical sensor detects the external light. The optical sensor is disposed at a position to which external light directed toward the display via the reflective mirror is reflected by the display to be directed.

## Claims

### Claim 1

A vehicle display device comprising:
a display that is housed in an internal space of a housing, the housing having an opening communicating between an outside of the housing and the internal space, and that emits, as display light, a display image projected on a projection target provided the outside of the housing;
at least one reflective mirror that is disposed on a light path of the display light from the display to the projection target and reflects the display light;
at least one optical sensor that is disposed at a position to which an external light entering from the opening and directed toward the display via the reflective mirror is reflected by the display to be directed toward the at least one optical sensor directly; and
a controller configured to execute temperature decreasing operation for decreasing a temperature of the display by detecting a light by the optical sensor.

### Claim 2 (depends on 1)

The vehicle display device according to claim 1, wherein
the optical sensor is disposed on an opposite side of the opening via the display in the internal space.

### Claim 3 (depends on 2)

The vehicle display device according to claim 2, further comprising:
a temperature sensor that detects a temperature of the display, wherein
the controller restricts execution of the temperature decreasing operation when the optical sensor detects the light and a detected value by the temperature sensor is equal to or less than a threshold value.

### Claim 4 (depends on 3)

The vehicle display device according to claim 3, wherein
the display includes:
a transmissive liquid crystal display unit; and
a backlight unit that illuminates the liquid crystal display unit from a back side,
the backlight unit is disposed facing the reflective mirror, and
the liquid crystal display unit is disposed inclined toward the optical sensor with respect to an emission direction of light emitted from the backlight unit toward the reflective mirror.

### Claim 5 (depends on 2)

The vehicle display device according to claim 2, further
comprising:
a temperature sensor that is disposed at least in a vehicle and the outside of the housing, wherein
the controller restricts execution of the temperature decreasing operation when the optical sensor detects the light and a detected value by the temperature sensor is equal to or less than a threshold value.

### Claim 6 (depends on 5)

The vehicle display device according to claim 5, wherein
the display includes:
a transmissive liquid crystal display unit; and
a backlight unit that illuminates the liquid crystal display unit from a back side,
the backlight unit is disposed facing the reflective mirror, and
the liquid crystal display unit is disposed inclined toward the optical sensor with respect to an emission direction of light emitted from the backlight unit toward the reflective mirror.

### Claim 7 (depends on 2)

The vehicle display device according to claim 2, wherein
the display includes:
a transmissive liquid crystal display unit; and
a backlight unit that illuminates the liquid crystal display unit from a back side,
the backlight unit is disposed facing the reflective mirror, and
the liquid crystal display unit is disposed inclined toward the optical sensor with respect to an emission direction of light emitted from the backlight unit toward the reflective mirror.

### Claim 8 (depends on 1)

The vehicle display device according to claim 1, further
comprising:
a temperature sensor that detects a temperature of the display, wherein
the controller restricts execution of the temperature decreasing operation when the optical sensor detects the light and a detected value by the temperature sensor is equal to or less than a threshold value.

### Claim 9 (depends on 8)

The vehicle display device according to claim 8, wherein
the display includes:
a transmissive liquid crystal display unit; and
a backlight unit that illuminates the liquid crystal display unit from a back side,
the backlight unit is disposed facing the reflective mirror, and
the liquid crystal display unit is disposed inclined toward the optical sensor with respect to an emission direction of light emitted from the backlight unit toward the reflective mirror.

### Claim 10 (depends on 1)

The vehicle display device according to claim 1, further
comprising:
a temperature sensor that is disposed at least in a vehicle and the outside of the housing, wherein
the controller restricts execution of the temperature decreasing operation when the optical sensor detects the light and a detected value by the temperature sensor is equal to or less than a threshold value.

### Claim 11 (depends on 10)

The vehicle display device according to claim 10, wherein
the display includes:
a transmissive liquid crystal display unit; and
a backlight unit that illuminates the liquid crystal display unit from a back side,
the backlight unit is disposed facing the reflective mirror, and
the liquid crystal display unit is disposed inclined toward the optical sensor with respect to an emission direction of light emitted from the backlight unit toward the reflective mirror.

### Claim 12 (depends on 1)

The vehicle display device according to claim 1, wherein
the display includes:
a transmissive liquid crystal display unit; and
a backlight unit that illuminates the liquid crystal display unit from a back side,
the backlight unit is disposed facing the reflective mirror, and
the liquid crystal display unit is disposed inclined toward the optical sensor with respect to an emission direction of light emitted from the backlight unit toward the reflective mirror.