Nippon Seiki Co., Ltd.

A display device includes an illumination device that emits illumination light, a liquid crystal display panel that includes an image display area where an image is displayed and a non-display area where no image is displayed, and that receives the illumination light and emits display light, and a monochrome liquid crystal panel that is located between the illumination device and the liquid crystal display panel, and that sets, to a black display state, an area corresponding to the non-display area and sets, to a white display state, an area corresponding to the image display area.

A head-up display device includes: a light emission surface that displays an image and emits display light corresponding to the displayed image; and a concave mirror that reflects the display light toward the windshield, and has an index S, represented in expression S=10.7×Mh+(−8.32)×Mv+(−0.0187)×Wh+(−0.000995)×Wv+0.345×Wi+(−3.52)×Ci+3.90×Dv, which is set to 90 or greater, where Mh and Mv respectively are magnifications in the horizontal and vertical directions of the virtual image with respect to the image in the optical axis position, Wh and Wv respectively are curvature radiuses in the horizontal and vertical direction of the position in which the optical axis reaches in the windshield, Wi is an incident angle of the optical axis into the windshield, Ci is an incident angle of the optical axis into the concave mirror, and Dv is an angle formed between a normal line of the light emission surface and the optical axis of the display light.

A head-up display apparatus includes a movable correction mirror located on an optical path of display light L 1 representing a virtual image, and configured to be pivotable between a reflection position at which display light L 2 representing a real image is reflected toward a windshield and a retraction position at which the movable correction mirror is retracted from the optical path of the display light L 1 , and a driving mechanism that drives the movable correction mirror to be pivoted. A liquid crystal display panel is placed on the opposite side to a reflective surface of the movable correction mirror, in a state where the movable correction mirror is pivoted to the reflection position, the display light L 2 is output toward the windshield, and in a state where the movable correction mirror is pivoted to the retraction position, the display light L 1 is output toward the windshield.

To provide a lightweight head-up display device that can withstand heat due to concentration of light. A head-up display device includes, a display that emits display light, a correction mirror that reflects the display light to cause an upper end and a lower end of the display light to cross each other, a concave mirror that reflects the display light to project the display light outside the head-up display device, a case made of a synthetic resin, housing the display, the correction mirror, and the concave mirror, and having an opening unit through which the display light passes, and a blind cover made of metal, provided on an inner bottom surface of the case, and forming an optical path space through which the display light travels within the case.

Provided is a head-up display device that enables display with more accurate quality. A head-up display device of the present disclosure comprises: a light source that emits light at a predetermined brightness and that emits illumination light; a display element that generates display light by being illuminated with the illumination light; a light sensor that, when illumination light is incident thereon, outputs an illumination light amount signal corresponding to the illumination light amount; and a light source controller that controls the light emission of the light source in response to the illumination light amount signal. The light source controller controls the light source, on the basis of deterioration information indicating the degree of deterioration due to aging of the light sensor, in a first mode in which light is emitted at a first brightness in a case where the deterioration of the light sensor is small, and in a second mode in which light is emitted at a second brightness lesser than the first brightness in a case where the deterioration of the light sensor is large.

To provide a head-up display that can provide light-shielding portions at a plurality of locations while controlling costs. Provided is a head-up display comprising: a display device that displays images; a plane mirror that reflects display light from the display device; a concave mirror that reflects display light via the plane mirror; a cover glass that allows display light to pass through the concave mirror; and a blind cover formed as an integral member, a virtual image being displayed by using the display light projected on an object from the display device via a prescribed optical path through the plane mirror, the concave mirror, and the cover glass, wherein the blind cover is provided with a first light-shielding portion that blocks the display light that deviates from the prescribed light path from the display device to the plane mirror, a second light-shielding portion that suppresses external light passing through the cover glass from entering the inside, and an attachment portion that attaches the plane mirror to the blind cover.

Provided is a technique by which it is possible to reduce a volume of a moisture-proof space for sealing a light source module against moisture. A light source module includes a first laser that emits red light, a second laser that emits green light, a third laser that emits blue light, an electronic cooling module that adjusts a temperature of the first laser, a first case that houses the first laser, and a second case that houses the second laser and the third laser.

To provide a mirror unit and a head-up display device capable of suppressing deterioration in image quality while further increasing strength with a simple configuration. A mirror unit includes: a substantially rectangular plate-shaped main body plate portion formed of a synthetic resin; a reflection layer that is formed on one surface of the main body plate portion and reflects display light; two shaft portions provided at end portions on both sides in an X direction; and a rib that is erected on the other back surface of the main body plate portion and extends in a rib extending direction V. The rib is formed such that a width of the rib in a direction orthogonal to the rib extending direction V has a length equal to or more than 50% of a thickness of the main body plate portion.

To provide a mirror and a head-up display apparatus which can be manufactured more easily with high shape accuracy. A mirror reflects display light L and has a reflective curved surface forming a curved surface. The mirror includes: a base material with an attachment surface forming a curved surface; a mirror film that forms the reflective curved surface in a state of being bonded to the attachment surface; and reference protrusions 24 a, 24 b, and 24 c formed to protrude around the base material. The reference protrusions 24 a, 24 b, and 24 c each includes an upper surface and a side surface. The upper surfaces of the reference protrusions 24 a and 24 b are located on a same plane Pxz. The side surfaces of the reference protrusions 24 a and 24 c are located on a same plane Pyz. The planes Pxz and Pyz are virtual planes orthogonal to each other.

To provide a mirror and a head-up display apparatus which can be manufactured more easily. A mirror has a reflective curved surface that reflects display light. The mirror includes: a base material with an attachment surface forming a curved surface; and a mirror film that forms the reflective curved surface in a state of being bonded to the attachment surface, that reflects light of polarized components corresponding to display light in visible light, and that transmits infrared light.