Abstract: A display device for a vehicle includes a housing, a liquid crystal display device, a transparent plate-shaped first heat conductive member that is arranged in contact with any of a display surface and a back surface of the liquid crystal display device, and a second heat conductive member that conducts heat between the first heat conductive member and the housing. The second heat conductive member is, for example, a Peltier element including a first surface and a second surface, and arranged to bring a first surface into contact with the first heat conductive member and bring a second surface into contact with the housing.

Abstract: A display device for a vehicle includes a housing that is provided in a vehicle, a TFT that is housed in the housing, an intermediate mirror, an infrared light absorbing member, and a thermistor. The intermediate mirror is housed in the housing, reflects, on a reflecting surface, display light that has been output from the TFT in such a way that the display light reaches a visual observation position of a driver of the vehicle, and transmits infrared light included in sunlight without reflecting the infrared light on the reflecting surface. The infrared light absorbing member is provided on a side of a rear face that is opposite to the reflecting surface of the intermediate mirror, and absorbs the infrared light that has been transmitted through the intermediate mirror. The thermistor is provided to the infrared light absorbing member, and detects the temperature of the infrared light absorbing member.

Abstract: An image display device includes a display unit provided in a housing and emits display light, a reflection unit that reflects the display light and projects the display light on a display member, a first polarizing unit provided in the housing, is disposed on an optical path on which the display light passes, and polarizes, along a first polarization axis, external light made incident on the housing from the outside, a second polarizing unit provided in the housing, is disposed on the optical path, is rotatably provided centering on an axis along the optical path, and polarizes the external light along a second polarization axis. The image display device further includes an adjustment unit that rotates the second polarizing unit based on condensing information of the display unit and changes the direction of the second polarization axis to adjust a transmission amount of the external light on the optical path.

Abstract: A display device for a vehicle includes a housing that is provided in a vehicle, a TFT that is housed in the housing, an intermediate mirror, an infrared light absorbing member, and a thermistor. The intermediate mirror is housed in the housing, reflects, on a reflecting surface, display light that has been output from the TFT in such a way that the display light reaches a visual observation position of a driver of the vehicle, and transmits infrared light included in sunlight without reflecting the infrared light on the reflecting surface. The infrared light absorbing member is provided on a side of a rear face that is opposite to the reflecting surface of the intermediate mirror, and absorbs the infrared light that has been transmitted through the intermediate mirror. The thermistor is provided to the infrared light absorbing member, and detects the temperature of the infrared light absorbing member.

Abstract: An image display device includes a display unit provided in a housing and emits display light, a reflection unit that reflects the display light and projects the display light on a display member, a first polarizing unit provided in the housing, is disposed on an optical path on which the display light passes, and polarizes, along a first polarization axis, external light made incident on the housing from the outside, a second polarizing unit provided in the housing, is disposed on the optical path, is rotatably provided centering on an axis along the optical path, and polarizes the external light along a second polarization axis. The image display device further includes an adjustment unit that rotates the second polarizing unit based on condensing information of the display unit and changes the direction of the second polarization axis to adjust a transmission amount of the external light on the optical path.

Abstract: A head-up display device includes: an indicator dimmed by duty ratio control and configured to emit display light; a mirror member rotatable about a rotation shaft and configured to reflect the display light from the indicator to project a display image; a control unit configured to control the dimming of the indicator and the rotation of the mirror member; and a temperature sensor configured to output a signal corresponding to an ambient temperature around the indicator. The control unit includes: a temperature prediction unit configured to predict a temperature of the indicator, and a failure avoidance unit configured to execute lowering an upper limit of the duty ratio or rotation control of the mirror member for reducing the amount of sunlight that enters the indicator through the mirror member when the predicted temperature of the indicator is greater than or equal to a threshold.

Abstract: A vehicle display apparatus includes: an image display device that includes a display surface that displays an image; a lens member that is arranged facing the display surface; and an optical system that includes a mirror and forms, using the mirror, an optical path from the lens member to a reflection surface on a windshield. The lens member includes an incident surface that faces the display surface and an emission surface that emits display light of the image toward the mirror. When viewed from an image horizontal direction, the lens member is tapered with a thickness from the incident surface to the emission surface being reduced toward one side in an image vertical direction. When viewed from the image horizontal direction, the display surface is inclined relative to a direction orthogonal to the optical path of the display light emitted from the emission surface to the mirror.

Abstract: A vehicle display device includes a display that emits a display image to be projected onto a windshield provided to a vehicle, as display light, at least one reflecting mirror that is disposed on an optical path of the display light from the display to the windshield and reflects the display light, an optical sensor that detects external light (SL) incident from an opening through which an outside and an internal space are communicated with each other, a temperature sensor that detects a temperature of the display, a dimming member that is disposed on the optical path of the display light, and a controller that causes the dimming member to be switched between a state with a first transmissivity and a state with a second transmissivity smaller than the first transmissivity.

Abstract: There is provided a head-up display device including: a display configured to emit a display light ray therefrom, a reflection member configured to pivot around a rotation axis and reflect the display light ray to project a display image; and a housing configured to accommodate the reflection member. The reflection member has a plurality of ribs protruding from a surface on an opposite side to a reflection surface which reflects the display light ray, and the plurality of ribs have a portion in which a height on an outer side in a rotational direction centered at the rotation axis is lower than that on an inner side in the rotational direction.

Abstract: A vehicle display device includes one light source, a display device that emits display light by light incident from the light source, a first lens causing the light incident from the light source to be polarized toward the display device, and a second lens arranged between the first lens and the display device and distributing the light polarized through the first lens toward the display device. An emitting surface of the first lens is formed of one convex curved surface corresponding to the one light source. An emitting surface of the second lens is formed in a convex shape to be curved toward the display device side, and includes a plurality of curved microlens surfaces.

Abstract: A vehicle display device includes a display that emits a display image to be projected onto a windshield provided to a vehicle, as display light, at least one reflecting mirror that is disposed on an optical path of the display light from the display to the windshield and reflects the display light, an optical sensor that detects external light (SL) incident from an opening through which an outside and an internal space are communicated with each other, a temperature sensor that detects a temperature of the display, a dimming member that is disposed on the optical path of the display light, and a controller that causes the dimming member to be switched between a state with a first transmissivity and a state with a second transmissivity smaller than the first transmissivity.

Abstract: A vehicle display device includes a display device, a reflecting mirror, an optical sensor configured to detect external light, and a controller configured to enable execution of a temperature lowering operation. The display device includes a light transmissive liquid crystal display unit disposed on an optical path of light emitted from a light source and a first optical member disposed between the liquid crystal display unit and the light source and configured to change an optical path of light that enters the first optical member from the light source and passes therethrough toward the liquid crystal display unit. The optical sensor is disposed on an optical path of the external light incident on the display device at a side opposite to the liquid crystal display unit across the first optical member. The first optical member includes a passage on an optical path through which the external light passes.

Abstract: There is provided a head-up display device including: a display configured to emit a display light ray therefrom, a reflection member configured to pivot around a rotation axis and reflect the display light ray to project a display image; and a housing configured to accommodate the reflection member. The reflection member has a plurality of ribs protruding from a surface on an opposite side to a reflection surface which reflects the display light ray, and the plurality of ribs have a portion in which a height on an outer side in a rotational direction centered at the rotation axis is lower than that on an inner side in the rotational direction.

Abstract: A vehicle display device includes a display device, a reflecting mirror, an optical sensor configured to detect external light, and a controller configured to enable execution of a temperature lowering operation. The display device includes a light transmissive liquid crystal display unit disposed on an optical path of light emitted from a light source and a first optical member disposed between the liquid crystal display unit and the light source and configured to change an optical path of light that enters the first optical member from the light source and passes therethrough toward the liquid crystal display unit. The optical sensor is disposed on an optical path of the external light incident on the display device at a side opposite to the liquid crystal display unit across the first optical member. The first optical member includes a passage on an optical path through which the external light passes.

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.

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.

Abstract: A vehicle display device includes a display that emits a display image projected on a windshield as a display light, a reflective mirror disposed on a light path of the display light from the display to the windshield and reflects the display light, a reflective optical member that is on a light path between the reflective mirror and the display and disposed facing the display, transmits the display light emitted from the display toward the reflective mirror, and reflects external light directed from the reflective mirror toward the display, an optical sensor that detects the external light, and a controller that executes temperature decreasing operation of the display when the optical sensor detects the external light. The optical sensor is disposed at a position to which the external light directed toward the display via the reflective mirrors is reflected by the reflective optical member to be directed.

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.

Abstract: A backlight unit includes a light source; a condensing unit that condenses light emitted from the light source; and a diverging unit that diverges the light entering from the condensing unit and that emits the light toward an image display unit of a light transmission type in a head-up display device. For example, the diverging unit is a lens in which both surfaces of an incident surface into which the light from the condensing unit enters as well as an emission surface from which the light is emitted toward the image display unit, are concave surfaces.

Abstract: A backlight unit includes a housing having an opening in which an liquid crystal display device is disposed, a light source disposed inside the housing, and an optical member disposed inside the housing, turning a path of light from the light source toward the liquid crystal display device, and having a triangular prism portion made of a translucent material. The prism portion has one side wall serving as an entrance wall on which the light from the light source is incident, another side wall as an exit wall emitting light to the liquid crystal display device, and still another side wall as a reflecting wall reflecting the light incident on the entrance wall to the exit wall inside the prism portion.