KR-20260064542-A - DISPLAY APPARATUS

Abstract

[Project] To provide a display device that can brighten the surface of an aerial image while preventing a decrease in resolution or brightness. [Solution] A display device (100) according to the present invention has a display (110), a first polarizing beam splitter (120) that reflects light output from the display (110), a λ/4 wavelength plate (130), a retroreflective material (140), a decorative sheet (150) that transmits light of an aerial image, and a second polarizing beam splitter (160) disposed between the decorative sheet (150) and the first polarizing beam splitter (120), with a transmission axis aligned in the same direction as the direction in which the light (L2) of the aerial image is transmitted.

Inventors

• 아시미네 가츠나리

Assignees

• 알프스 알파인 가부시키가이샤

Dates

Publication Date

20260507

Application Date

20251022

Priority Date

20241031

Claims (5)

1. As a display device capable of displaying aerial images using retroreflection, light source and, Retroreflective material and, A first polarizing beam splitter that reflects light from the light source toward the retroreflective material, and A phase difference plate disposed between the first polarizing beam splitter and the retroreflective material, which provides a constant phase difference between the incident light and the emitted light, and A decorative sheet that transmits light of an aerial image transmitted through the first polarizing beam splitter, and A second polarizing beam splitter positioned on the bottom side opposite to the decorative surface of the above-mentioned decorative sheet, with a transmission axis aligned in the same direction as the direction in which the light of the above-mentioned aerial image is transmitted. A display device having
2. In paragraph 1, The above-mentioned second polarizing beam splitter has a transparent substrate and a polarizing film formed on the transparent substrate, and the polarizing film is opposite to the bottom surface of the decorative sheet, a display device.
3. In paragraph 1, A display device in which the decorative sheet is laminated on the second polarizing beam splitter.
4. In paragraph 1, The above-mentioned decorative sheet is a display device having an ink or paint having a light-diffusing component.
5. In paragraph 1, The above phase difference plate is a λ/4 wavelength plate, a display device.

Description

Display apparatus The present invention relates to a display device that displays an aerial image by retroreflection. Aerial Imaging by Retro-Reflection (AIRR) is known. For example, the aerial imaging device of Patent Document 1 places a decorative sheet between an imaging element (20) and an imaging position (P) so that the imaging element (20) cannot be observed from the outside. The decorative sheet may, for example, have holes punched in it or transparent ink printed on it. FIG. 1 is a top view showing a schematic configuration of a display device that displays a conventional aerial image. FIG. 2 is a top view showing a schematic configuration of a display device according to an embodiment of the present invention. FIG. 3 is a diagram explaining the difference between a conventional display device and a display device of the present embodiment. Next, embodiments of the present invention will be described. In one aspect of the present invention, a display device is installed at the bottom of the bottom side opposite to the main surface of the decorative sheet, with a transmission axis aligned with the direction in which the light of the aerial image is transmitted, and light entering from the outside is reflected by the polarizing film of the polarizing beam splitter after passing through the decorative sheet. As a result, the decorative sheet can be made to appear bright even with thin ink, and at the same time, since the light rays of the aerial image are aligned with the transmission axis of the polarizing beam splitter, it is possible to improve the reduction in brightness of the aerial image or blurriness caused by light scattering. It should be noted that the drawings referenced in the following description of the embodiments include exaggerated representations to facilitate understanding of the invention and do not represent the actual shape or scale of the product. [Example] Next, embodiments of the present invention will be described in detail. FIG. 2 is a top view showing the schematic configuration of a display device according to an embodiment of the present invention. The display device (100) of the present embodiment comprises a display (110), a first polarizing beam splitter (120), a λ/4 wavelength plate (130), a retroreflective material (140), a decorative sheet (150), and a second polarizing beam splitter (160). These components are, for example, placed inside a casing, and an aerial image (P) floating in the air is displayed from one side of the casing. The display (110) is a light source for generating an original image of an aerial image (P). The display (110) is, for example, an LED or organic EL display, a projector, an LED unit in which a plurality of LEDs are arranged two-dimensionally, etc. The display (110) is positioned so that the first polarizing beam splitter (120) can incident light of the original image of the aerial image (P). The light emitted from the display (110) is generally polarized light. The first polarizing beam splitter (120) is positioned at an angle relative to the display (110) and reflects a portion of the light incident from the display (110) toward the retroreflective material (140). The polarizing beam splitter is an optical element that separates light based on its polarization state. Specifically, it separates the incident light into two different components of linear polarization, namely a P-polarization component and an S-polarization component, reflecting the light of the S-polarization component and transmitting the light of the P-polarization component. For example, when the P-polarization component is transmitted through the polarizing beam splitter, the transmission axis of the polarizing beam splitter is the direction in which the light of the P-polarization component travels. The polarizing beam splitter is constructed by coating a polarizing film for polarization separation on the surface of a substrate, such as a flat glass or plastic, for example. The polarizing film reflects a specific component and transmits another component. This polarizing film functions as a reflective surface of the polarizing beam splitter. A λ/4 wave plate (130) is disposed on the surface side of the retroreflective material (140). The λ/4 wave plate (130) is, for example, a phase difference film attached to the surface of the retroreflective material (140). The λ/4 wave plate (130) generates a phase difference of λ/4 between the incident light and the output light. For example, when linearly polarized light vibrating in a certain direction is incident on the λ/4 wave plate, light converted into circularly polarized light is emitted, or when circularly polarized light is incident, light converted into linearly polarized light is emitted. The retroreflector (140) is an optical element that reflects light in the same direction as the incident light, and its configuration is not particularly limited, but is configured, for example, by a triangular pyramidal retrorefl