Light source device and display device

Abstract

The present invention provides a light source device that emits laser light with each optical axis closer together than the time of emission from each semiconductor laser element. [Solution] The light source device includes a first semiconductor laser element that emits a first laser beam of a first color, a second semiconductor laser element that emits a second laser beam of a second color different from the first color, a third semiconductor laser element that emits a third laser beam of a third color different from the first and second colors, a housing having a first light incident surface and a first light emission surface, an aperture through which the laser beam passes after passing through a collimating lens, and a housing in which the first, second, and third semiconductor laser elements and a lens are arranged, a light-transmitting member provided on the second light incident surface that closes the aperture and has a second light incident surface, through which the laser beam passes, a first diffraction grating that deflects the third laser beam so that the optical axis of the third laser beam approaches the optical axis of the first laser beam, and a second diffraction grating that deflects the second laser beam so that the optical axis of the second laser beam approaches the optical axis of the first laser beam.

Claims

1. A first semiconductor laser element that emits a first laser beam of a first color, A second semiconductor laser element that emits a second laser beam of a second color different from the first color, A third semiconductor laser element that emits a third laser beam of a third color different from the first and second colors, A lens having a first light incident surface and a first light emission surface, which collimates the first laser beam, the second laser beam, and the third laser beam, A housing is provided through which the first laser beam, the second laser beam, and the third laser beam that have passed through the lens pass, and through which the first semiconductor laser element, the second semiconductor laser element, the third semiconductor laser element, and the lens are arranged on the inside. The opening is closed, and a light-transmitting member has a second light incident surface and a second light emission surface, through which the first laser beam, the second laser beam, and the third laser beam pass, The first semiconductor laser element is positioned between the second semiconductor laser element and the third semiconductor laser element. The light-transmitting member is, A first diffraction grating is provided on the second light incident surface and deflects the third laser beam such that the optical axis of the third laser beam is closer to the optical axis of the first laser beam compared to before the third laser beam passes through the second light incident surface, A light source device comprising: a second diffraction grating provided on the second light incident surface, which deflects the second laser light such that the optical axis of the second laser light is closer to the optical axis of the first laser light compared to before the second laser light passes through the second light incident surface.

2. The second laser beam has a short axis direction and a long axis direction, The third laser beam has a short axis direction and a long axis direction, In the region overlapping with the second laser beam but not overlapping with the first laser beam, the first diffraction grating has a pitch that narrows as it moves from the center of the second laser beam outward in the direction of the second laser beam's short axis. The light source device according to claim 1, wherein in a region overlapping with the third laser beam and a region not overlapping with the first laser beam, the pitch of the second diffraction grating narrows as it moves from the center of the third laser beam outward in the direction of the short axis of the third laser beam.

3. A first metasurface is provided on the second light emission surface, located in the optical path of the second laser beam deflected by the first diffraction grating, and arranged such that the refraction angle increases from the center of the second laser beam outward in the direction of the short axis of the second laser beam, A light source device according to claim 1 or claim 2, comprising: a second metasurface provided on the second light emitting surface, located in the optical path of the third laser beam deflected by the second diffraction grating, and arranged such that the angle of refraction increases as the distance from the center of the third laser beam outward in the direction of the short axis of the third laser beam increases.

4. The first metasurface is further configured such that, in a plan view, the optical axis of the second laser beam and the optical axis of the first laser beam are parallel. The light source device according to claim 3, wherein the second metasurface is further configured such that, in a plan view, the optical axis of the third laser beam and the optical axis of the first laser beam are parallel.

5. The light source device according to claim 1 or claim 2, further comprising a light diffusing member provided on the second light emitting surface for diffusing the incident first laser light, the second laser light, and the third laser light to mix colors.

6. The light source device according to claim 5, wherein the first color is red, the second color is green, and the third color is blue.

7. The second light-emitting surface is provided with a light-diffusing member that diffuses the incident first laser light, second laser light, and third laser light to mix the colors, The light source device according to claim 3, wherein the first metasurface and the second metasurface are provided in a position that overlaps with the light diffusing member in a plan view.

8. The lens has an aspherical first light incident surface, The first light incident surface is, A first refractive region that reduces the wavefront aberration of the incident first laser beam, A second refractive region that reduces the wavefront aberration of the incident second laser beam, A light source device according to claim 1 or claim 2, comprising a third refractive region for reducing the wavefront aberration of the incident third laser light.

9. The lens has a third diffraction grating on the first light-emitting surface, The third diffraction grating is, A first diffraction region that diffracts the incident first laser light, A second diffraction region that diffracts the incident second laser light, A third diffraction region that diffracts the incident third laser light, The light source device according to claim 8.

10. The light source device according to claim 1 or claim 2, wherein the distance between the optical axes of the first semiconductor laser element, the second semiconductor laser element, and the third semiconductor laser element, which are adjacent to each other, is 100 μm or more and 400 μm or less.

11. Having a light source device according to claim 1 or claim 2, A display device that displays an image using white laser light emitted from the aforementioned light source device.

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