JP-2026074522-A - Light source device, projection display device

Abstract

[Problem] In the field of projection-type image display devices that modulate and project laser light according to an image signal, there has been a desire to realize a device with less color unevenness. [Solution] The system comprises a first laser module having a plurality of first semiconductor laser elements, a second laser module having a plurality of second semiconductor laser elements, an integrator illumination system that superimposes a plurality of laser beams incident on the incident surface and emits them from the exit surface, and a correction optical system. Each of the plurality of first semiconductor laser elements has one light-emitting part and emits laser light of a first wavelength, and each of the plurality of second semiconductor laser elements has two light-emitting parts and emits laser light of a second wavelength. The correction optical system approximates the intensity distribution of the laser beam incident on the incident surface of the integrator illumination system from the first laser module to the intensity distribution of the laser beam incident on the incident surface of the integrator illumination system from the second laser module. [Selection Diagram] Figure 2

Inventors

• 山影 明広
• 梅 雨非

Assignees

• 株式会社ライトショー・テクノロジー

Dates

Publication Date

20260507

Application Date

20241021

Claims (8)

1. A first laser module having multiple first semiconductor laser elements, A second laser module having multiple second semiconductor laser elements, An integrator illumination system that superimposes multiple laser beams incident on the incident surface and emits them from the exit surface, Equipped with a corrective optical system, Each of the plurality of first semiconductor laser elements is equipped with one light-emitting section and emits laser light of a first wavelength. Each of the plurality of second semiconductor laser elements is equipped with two light-emitting units and emits laser light of a second wavelength. The intensity distribution of the laser beam incident on the incident surface of the integrator illumination system from the second laser module has two peaks aligned along one side of the incident surface, and at the position of the peaks, the laser beam has a spot shape whose longitudinal direction is aligned along the one side of the incident surface. The correction optical system is an optical system that approximates the intensity distribution of the laser beam incident on the incident surface of the integrator illumination system from the first laser module to the intensity distribution of the laser beam incident on the incident surface of the integrator illumination system from the second laser module. A light source device characterized by the following features.
2. In the first laser module, the longitudinal directions of the light-emitting portions of each of the plurality of first semiconductor laser elements are oriented in the same direction. In the second laser module, the longitudinal directions of the light-emitting portions of each of the plurality of second semiconductor laser elements are oriented in the same direction. The aforementioned corrective optical system is The optical path of the laser beam emitted from the first laser module is corrected so that the intensity distribution of the laser beam incident on the incident surface from the first laser module has two peaks aligned along one side of the incident surface. The light source device according to feature 1.
3. The aforementioned corrective optical system is The irradiation position of the laser beam emitted from some of the multiple first semiconductor laser elements and the irradiation position of the laser beam emitted from the remaining first semiconductor laser elements are moved in opposite directions along one side of the incident surface of the integrator illumination system. The light source device according to claim 2.
4. The aforementioned corrective optical system is A first prism is positioned between the first laser module and the incident surface to deflect the laser beam emitted from some of the first semiconductor laser elements, The system comprises a second prism positioned between the first laser module and the incident surface, which deflects the laser beam emitted from the remaining first semiconductor laser elements in a direction different from that of the first prism. The light source device according to feature 3.
5. A first lens is positioned between the first laser module and the incident surface, and focuses the laser beam emitted from a portion of the first semiconductor laser elements to a first position on the incident surface. The system includes a second lens positioned between the first laser module and the incident surface, which focuses the laser beam emitted from the remaining first semiconductor laser elements to a second position different from the first position on the incident surface. The light source device according to feature 3.
6. The aforementioned corrective optical system is The device has fixing means for tilting and fixing the portion of the first semiconductor laser elements and the remaining first semiconductor laser elements so that the emission direction of the portion of the first semiconductor laser elements and the emission direction of the remaining first semiconductor laser elements are different. The light source device according to feature 3.
7. The first wavelength laser light is blue or green, and the second wavelength laser light is red. The light source device according to feature 1.
8. A light source device according to any one of claims 1 to 7, A reflective optical modulator and A transfer optical system for transferring laser light emitted from the output surface of the integrator illumination system to the reflective optical modulation element, The system comprises a projection lens that projects the image light output by the reflective optical modulation element, A projection-type display device characterized by the following features.

Description

This invention relates to a light source device and a projection-type display device equipped with a light source device. Projection-type display devices using laser light have been known for some time. Patent Document 1 discloses a projection-type display device comprising a laser light source, a photoacoustic modulator that optically modulates the laser light according to a video signal, a polygonal mirror that horizontally scans the modulated laser light, and a galvanometer mirror that vertically scans the light. Patent Document 2 discloses a compact projection display device capable of projecting an image by irradiating a reflective optical modulation element with laser light from three colored laser light sources via an integrator illumination system. Japanese Patent Publication No. 2000-180759Japanese Patent Publication No. 2023-143587 A schematic diagram showing the optical path from the blue light (B) and green light (G) laser modules to the rod of the integrator illumination system, as viewed from the Y direction, in the illumination device according to Embodiment 1.(a) A schematic diagram of the optical path from the L-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 1. (b) A schematic diagram of the optical path from the R-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 1. (c) A schematic diagram showing how the laser beam is focused onto the incident surface INP of the integrator illumination system, in Embodiment 1.This figure shows the light intensity distribution of the laser beam emitted from the exit surface EXP of the rod 105 of the integrator illumination system.(a) A schematic diagram of the optical path from the L-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 2. (b) A schematic diagram of the optical path from the R-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 2. (c) A schematic diagram showing how the laser beam is focused onto the incident surface INP of the integrator illumination system, in Embodiment 2.(a) A schematic diagram of the optical path from the L-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 3. (b) A schematic diagram of the optical path from the R-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 3. (c) A schematic diagram showing how the laser beam is focused onto the incident surface INP of the integrator illumination system, in Embodiment 3.(a) A schematic diagram of the optical path from the L-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 4. (b) A schematic diagram of the optical path from the R-row semiconductor laser 11B of the blue light (B) and green light (G) laser modules to the rod 105 of the integrator illumination system, as viewed from the X direction, in Embodiment 4. (c) A schematic diagram showing how the laser beam is focused onto the incident surface INP of the integrator illumination system, in Embodiment 4.(a) Diagram showing bulk rods used in an integrator lighting system. (b) Diagram showing hollow rods used in an integrator lighting system.A diagram showing the schematic configuration of the optical system of a projection-type display device according to Embodiment 5.A diagram showing the schematic configuration of the optical system of a projection-type display device according to Embodiment 6.(a) Diagram showing a red light (R) laser module. (b) Diagram showing blue light (B) and green light (G) laser modules. (c) Graph illustrating the light intensity distribution emitted from the output surface EXP of a conventional integrator illumination system.(a) Diagram showing a red light (R) illumination system. (b) Diagram showing conventional blue light (B) and green light (G) illumination systems. The light source device and projection display device, which are embodiments of the present invention, will be described with reference to the drawings. The embodiments described below are illustrative, and for example, the detailed configurations can be modified as appropriate by those skilled in the art without departing from the spirit of the present invention. In the drawings referenced in the following descriptio