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JP-2026075265-A - display device

JP2026075265AJP 2026075265 AJP2026075265 AJP 2026075265AJP-2026075265-A

Abstract

[Problem] To provide a display device that can suppress the amount of light that directly reaches the viewer from the display. [Solution] The display device 1 comprises a display unit 100 that emits display light L, a prism 110 having an incident surface 113 into which the display light L is incident, a reflective surface 111 that reflects the display light L incident from the incident surface 113, and an exit surface 112 that emits the display light L reflected by the reflective surface 111, and a mirror 120 that reflects the display light L emitted from the exit surface 112 of the prism 110 toward the viewer P. Multiple microprisms that refract the display light L are formed on the exit surface 112 of the prism 110. [Selection Diagram] Figure 1

Inventors

  • 林 武

Assignees

  • 日本精機株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (4)

  1. A display unit that emits display light, A prism having an incident surface into which the display light from the display unit is incident, a reflective surface that reflects the display light incident from the incident surface, and an exit surface that emits the display light reflected from the reflective surface, The prism comprises a mirror that reflects the display light emitted from the emission surface toward the viewer, Multiple microprisms that refract the display light are formed on the emission surface of the prism. Display device.
  2. The plurality of microprisms are either formed integrally with the prism body or formed by a prism sheet separate from the prism body. The display device according to claim 1.
  3. The reflective surface is formed by a mirror layer that is separate from the body of the prism and adheres to the outer surface of the prism. The display device according to claim 1 or 2.
  4. The reflective surface is non-planar and has a spherical or aspherical shape. The display device according to claim 1.

Description

This disclosure relates to a display device. The display system described in Patent Document 1 comprises a mirror, a display and backlight horizontally positioned above and in front of the mirror with the light-emitting surface facing downward, and a beam splitter positioned at a 45-degree angle between the mirror and the viewer. Light emitted by the backlight and modulated by the display propagates downward, is then reflected by the beam splitter and back towards the mirror, which in turn reflects the light back towards the beam splitter in a rotationally polarized state. This reflected light passes through the beam splitter and propagates to the viewer's eyes (see Figure 16, paragraphs 0038-0041 of Patent Document 1). Patent No. 7474317 This is a schematic diagram of a display device according to one embodiment of the present disclosure.This is a schematic diagram of a display device according to one embodiment of the present disclosure.This is a schematic diagram of the ejection surface of a prism according to one embodiment of the present disclosure.This is a schematic diagram of the ejection surface of a prism according to a modified embodiment of one embodiment of the present disclosure.The viewer of the comparative example is shown in the schematic diagram of the display device.This is a schematic diagram of a display device according to one embodiment of the present disclosure.(A) is a schematic diagram of a display device according to one embodiment of the present disclosure, and (B) is a schematic diagram of a display device according to a comparative example.This is a schematic diagram of a display device relating to a modified example of the present disclosure. A display device according to one embodiment of this disclosure will be described with reference to the drawings. This display device is mounted in a vehicle and, for example, is integrated into the vehicle's instrument panel or headrest. This display device allows a viewer to see a virtual image, including vehicle information or entertainment content, through a mirror. As shown in Figure 1, the display device 1 comprises a display unit 100, a prism 110 used as a light guide, a mirror 120 as a reflector, a housing 130, and a light-transmitting cover 140. In the following explanation, the X direction is the left-right direction (vehicle width direction) relative to the observer P, the Y direction is the up-down direction (vehicle height direction) relative to the observer P, and the Z direction is the depth direction (vehicle front-to-back direction) relative to the observer P. The housing 130 is made of a light-shielding synthetic resin, such as black, and is formed in the shape of a hollow box. The internal storage space S of the housing 130 houses the display unit 100, the prism 110, and the mirror 120. An opening 132 is formed in a part of the front wall portion 131 on the viewer P side of the housing 130, through which the display light L passes. The opening 132 is located at the lower part of the front wall portion 131 and is set to have a length in the Y direction that is more than half (for example, 60% to 70%) of the total length of the front wall portion 131 in the Y direction. The opening 132 may be set to a length in the Y direction that is less than half the total length of the front wall portion 131 in the Y direction, or it may be formed over the entire area of the front wall portion 131 in the Y direction. The translucent cover 140 is provided to cover the opening 132. The translucent cover 140 is made of a translucent synthetic resin material, such as acrylic resin. The translucent cover 140 is flat. The translucent cover 140 is rectangular in shape on the XY plane, and more specifically, it is a rectangular plate that is long in the X direction. The display light L reflected by the mirror 120 is transmitted through the translucent cover 140. Furthermore, the translucent cover 140 is not limited to a flat plate shape, but may also be in the shape of a curved plate. The display unit 100 is located at the top of the housing space S. More specifically, the display unit 100 is positioned in the Z direction so as not to face the opening 132 of the front wall portion 131. The display unit 100 is located in the Z direction between the prism 110 and the mirror 120. The display unit 100 includes a light-emitting surface 109 that emits display light L. The light-emitting surface 109 is rectangular in shape on the XY plane, and more specifically, it is a rectangle that is elongated in the X direction. The light-emitting surface 109 of the display unit 100 faces forward from the virtual image V toward the viewer P. The light-emitting surface 109 emits display light L in the forward direction. As shown in Figure 2, the display unit 100 comprises a plurality of light sources 101, a light guide 102, a diffuser plate 103, a display element 104, and a case 105. The case 105 is formed from a light-shielding resin to form a box shape that op