Indication device

Abstract

The present invention provides a display device that can suppress brightness unevenness while maintaining the target brightness of the aerial image. [Solution] The display device 100 includes a light source 10, a retroreflective section 20, and a light branching section 30 that reflects or transmits light L(L1) emitted from the light source 10 toward the retroreflective section 20, and transmits or reflects light L(L2) reflected from the retroreflective section 20, and displays an aerial image AI in space. The display device 100 is equipped with a light distribution control means 200 that can control the light distribution angle of the light L within the display device 100.

Claims

[Claim 1] A display device for displaying an aerial image in space, comprising a light source, a retroreflective section, and a light branching section that reflects or transmits light emitted from the light source toward the retroreflective section, and transmits or reflects light reflected from the retroreflective section, A display device characterized by comprising a light distribution control means capable of controlling the light distribution angle of the light within the display device. [Claim 2] A display device according to claim 1, The display device is characterized in that the light distribution control means is provided on the optical path between the light source and the light branching section. [Claim 3] A display device according to claim 1, The display device is characterized in that the light distribution control means is provided on the optical path between the light branching section and the retroreflection section. [Claim 4] A display device according to claim 1, The display device is characterized in that the light distribution control means is provided on the optical path between the light branching section and the aerial image. [Claim 5] A display device according to claim 1, The display device is characterized in that the retroreflective section has a full-corner cube-shaped retroreflective structure in which multiple unit elements are arranged in parallel, each unit element being formed by combining three square planes at right angles to one another. [Claim 6] A display device according to claim 5, A display device characterized in that the length of one side of the unit element is greater than or equal to a specified length based on the wavelength of light. [Claim 7] A display device according to claim 6, A display device characterized in that the specified length is 122 times or more the wavelength of the light. [Claim 8] A display device according to any one of claims 1 to 7, Equipped with additional lenses, The lens is provided on the optical path between the light source and the optical branching section. The display device is characterized in that the light source is located inside the focal point of the lens.

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