US-20260126712-A1 - ILLUMINATION SYSTEM AND A PROJECTION DEVICE

US20260126712A1US 20260126712 A1US20260126712 A1US 20260126712A1US-20260126712-A1

Abstract

The present disclosure is related to an illumination system and a projection device including a first light source module, a second light source module and a first light splitting element. The first light splitting element reflects a first beam of the first light source module. The first light splitting element allows a second beam of the second light source module pass through and be transmitted to the optical element. The light spots formed by the first beam and the second beam on the optical element at least partially overlap and form a first light spot group and a second light spot group. The first light spot group and the second light spot group are arranged along the first direction. The illumination system and the projection device of the present disclosure effectively improve the brightness of an illumination beam.

Inventors

Yi-Hsuang Weng
Chun-Hsin Lu
WEN-CHIEH CHUNG

Assignees

CORETRONIC CORPORATION

Dates

Publication Date: 20260507
Application Date: 20251022
Priority Date: 20241105

Claims (20)

1 . An illumination system, comprising: a first light source module, providing a first beam transmitted along a first direction, wherein the first beam comprises at least one of a first sub beam, a second sub beam and a third sub beam; a second light source module, providing a second beam transmitted along a second direction, wherein the second beam comprises at least one of a first sub beam, a second sub beam and a third sub beam, and the first direction is different from the second direction: a first light splitting element, disposed between the first light source module and the second light source module, wherein the first light splitting element reflects the first beam and causes the first beam to be transmitted to an optical element along the second direction, wherein the first light splitting element allows the second beam to pass through and the second beam is transmitted to the optical element along the second direction, wherein a light spot formed by the first sub beam of the first beam on the optical element is respectively at least partially overlapped with light spots formed by the second sub beam and third sub beam of the second beam on the optical element to form a first light spot group, a light spot formed by the first sub beam of the second beam on the optical element is respectively at least partially overlapped with light spots formed by the second sub beam and third sub beam of the first beam on the optical element to form a second light spot group, and the first light spot group and the second light spot group are arranged along the first direction.
2 . The illumination system as claimed in claim 1 , wherein the first light splitting element comprises a first light splitting zone and a second light splitting zone, the first light splitting zone reflects the second sub beam and third sub beam of the first beam and allows the first sub beam of the second beam to pass through, and the second light splitting zone reflects the first sub beam of the first beam and allows the second sub beam and the third sub beam of the second beam to pass through.
3 . The illumination system as claimed in claim 1 , wherein the first light source module comprises a first light emitting unit, a second light emitting unit and a third light emitting unit, the second light emitting unit and third light emitting unit are disposed in parallel, and the first light emitting unit is disposed on the same side as the second light emitting unit and the third light emitting unit.
4 . The illumination system as claimed in claim 1 , wherein the first light source module and the second light source module are disposed to form an L-shaped configuration.
5 . The illumination system as claimed in claim 1 , further comprising: a third light source module, providing a third beam transmitted along the first direction: a fourth light source module, providing a fourth beam transmitted along a third direction, wherein the third direction is different from the first direction and the second direction: a second light splitting element, disposed between the third light source module and the fourth light source module, wherein the second light splitting element reflects the third beam and allows the fourth beam to pass through; and a first optical element, for allowing at least a part of the first beam and second beam to pass through and for reflecting at least a part of the third beam and the fourth beam to cause the first beam, second beam, third beam and fourth beam to be transmitted to the optical element: wherein light spots formed by at least part of the third beam on the optical element and light spots formed by at least part of the fourth beam on the optical element are at least partially overlapped and form a third light spot group and a fourth light spot group, and the third light spot group and the fourth light spot group are arranged along the first direction.
6 . The illumination system as claimed in claim 5 , wherein the first optical element is a zoned optical element, the zoned optical element comprises a plurality of first transmissive zones and a plurality of first reflection zones, and the plurality of first transmissive zones and the plurality of first reflection zones are alternately arranged.
7 . The illumination system as claimed in claim 6 , wherein the third light source module and the fourth light source module are symmetrically disposed with respect to the first light source module and the second light source module respectively along an extending direction of the first optical element, wherein the plurality of first transmissive zones and the plurality of first reflection zones are arranged alternately along the extending direction.
8 . The illumination system as claimed in claim 5 , wherein the first light spot group, the second light spot group, the third light spot group and the fourth light spot group are alternately arranged in the first direction.
9 . The illumination system as claimed in claim 5 , further comprising: a second optical element: wherein, the first optical element is a partially transmissive and partially reflective optical element, the partially transmissive and partially reflective optical element is configured to allow portions of the first beam, the second beam, the third beam and the fourth beam to pass through and to reflect the other portions of the first beam, the second beam, the third beam and the fourth beam; and the second optical element is disposed on a transmission path of the portions of the third beam and the fourth beam from the first optical element and is disposed on a transmission path of the other portions of the first beam and the second beam from the first optical element, the second optical element reflects the other portions of the first beam and the second beam and the portions of the third beam and the fourth beam such that the other portions of the first beam and the second beam and the portions of the third beam and the fourth beam are transmitted to the optical element, wherein, a plurality of light spots formed by the other portion of the first beam on the optical element at least partially overlap with a plurality of light spots formed by the other portion of the second beam on the optical element to form a first sub-light spot group and a second sub-light spot group, a plurality of light spots formed by the portion of the third beam on the optical element at least partially overlap with a plurality of light spots formed by the portion of the fourth beam on the optical element to form a third sub-light spot group and a fourth sub-light spot group, and the first sub-light spot group, the second sub-light spot group, the third sub-light spot group and the fourth sub-light spot group are alternately arranged in the first direction.
10 . The illumination system as claimed in claim 9 , wherein the first, second, third and fourth light spot groups are respectively arranged with the first, second, third and fourth sub-light spot groups along the third direction.
11 . The illumination system as claimed in claim 10 , further comprising: a third optical element, disposed on a transmission path of the first light beam and the second light beam from the first light splitting element, for reflecting at least a portion of the first beam and a portion of the second beam such that the at least a portion of the first beam and the at least a portion of the second beam is transmitted to the first optical element.
12 . The illumination system as claimed in claim 11 , wherein the first light source module and the second light source module are respectively disposed in parallel with the third light source module and the fourth light source module.
13 . The illumination system as claimed in claim 10 , further comprising: a fourth optical element: wherein the third optical element is configured to allow a first portion of the first beam and a first portion of the second beam to pass through and be transmitted to the fourth optical element, and the third optical element is configured to reflect a second part of the first beam and a second part of the second beam such that the second parts of the first beam and the second beam are transmitted to the first optical element: wherein the fourth optical element is configured to reflect the first portion of the first beam and the first portion of the second beam such that the first portions of the first beam and the second beam are transmitted to the second optical element, wherein the second optical element is configured to allow the first portions of the first beam and the second beam to pass through.
14 . The illumination system as claimed in claim 10 , wherein the first optical element comprises at least one partially reflective zone, the second optical element comprises a plurality of reflection zones and a plurality of transmissive zones, the plurality of reflection zones and the plurality of transmissive zones of the second optical element are alternately arranged, the third optical element comprises at least one partially reflective zone, and the fourth optical element comprises at least one reflection zone.
15 . The illumination system as claimed in claim 13 , further comprising: a fifth light source module, for providing a fifth beam: wherein the third optical element is configured to reflect at least a portion of the fifth beam to cause the portion of the fifth light beam to be transmitted to the fourth optical element: wherein the third optical element is configured to allow the other portion of the fifth beam to pass through such that the other portion of the fifth beam is transmitted to the first optical element.
16 . The illumination system as claimed in claim 5 , further comprising: a fifth light source module, for providing a fifth beam transmitted along the first direction: a sixth light source module, for providing a sixth beam transmitted along the second direction: a third light splitting element, for reflecting the fifth beam and for allowing the sixth beam to pass through such that the fifth beam and the sixth beam are transmitted to the optical element: wherein, a plurality of light spots formed by at least a portion of the fifth beam on the optical element are at least partially overlapped with a plurality of light spots formed by at least a portion of the sixth beam on the optical element to form a fifth light spot group and a sixth light spot group, and the fifth light spot group and the sixth light spot group are arranged along the first direction.
17 . The illumination system as claimed in claim 16 , wherein the fifth and sixth light spot groups and the first, second, third and fourth light spot groups are arranged along the third direction.
18 . The illumination system as claimed in claim 16 , wherein the fifth light source module and the sixth light source module are respectively disposed in parallel with the first light source module and the second light source module.
19 . The illumination system as claimed in claim 16 , further comprising: a second optical element: wherein the first optical element is for allowing a portion of the third beam and a portion of the fourth beam to pass through and for reflecting the other portions of the third beam and the fourth beam: wherein the second optical element is configured to allow the fifth beam and the sixth beam to pass through and is configured to reflect portions of the third beam and the fourth beam such that the portion of the third beam, the portion of the fourth beam, the fifth beam and the sixth beam are transmitted to the optical element.
20 . The illumination system as claimed in claim 19 , wherein the first optical element comprises a plurality of partially reflective zones and a plurality of transmissive zones, the plurality of partially reflective zones and the plurality of transmissive zones of the first optical element are alternately arranged, the second optical element comprises a plurality of reflection zones and a plurality of transmissive zones, and the plurality of reflection zones and the plurality of transmissive zones of the second optical element are alternately arranged.

Description

CROSS-REFERENCES This application claims the priority benefit of Chinese Patent Application Serial Number 2024115630002, filed on Nov. 5, 2024, the full disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present disclosure is related to optical systems and electronic devices. More particularly, the embodiments are related to an illumination system and a projection device. DESCRIPTION OF RELATED ART A projection device (such as a projector) is a display device that generates a display image. The imaging principle of the projection device is to convert the illumination beam generated by the illumination system into an image beam through a light valve and project the image beam onto a projection surface such as a screen or a wall through a projection lens. As the projection device is widely used in different environments, the projection device is also correspondingly designed to have a smaller size. In order to increase the brightness of the illumination beam, multiple light sources are usually combined to achieve a light combination. However, the size of the light spot formed by the multiple light sources on the optical element is too large, resulting in a corresponding increase in the volume of the projection device. The information disclosed in this DESCRIPTION OF RELATED ART section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the DESCRIPTION OF RELATED ART section does not mean that one or more problems to be resolved by one or more embodiments of the disclosure was acknowledged by a person of ordinary skill in the art. SUMMARY OF THE INVENTION The embodiment of the present disclosure provides an illumination system and a projection device to allow at least two light spots at least partially overlapping on an optical element to effectively increase the brightness of an illumination beam without increasing the volume of the projection device. In order to achieve the above object and other related objects, the present disclosure provides an illumination system including a first light source module, a second light source module and a first light splitting element. The first light source module provides a first beam transmitted along a first direction. The first beam includes at least one of a first sub beam, a second sub beam and a third sub beam. The second light source module provides a second beam transmitted along a second direction. The second beam includes at least one of a first sub beam, a second sub beam and a third sub beam. The first direction is different from the second direction. The first light splitting element is disposed between the first light source module and the second light source module. The first light splitting element reflects the first beam to cause the first beam to be transmitted to an optical element along the second direction. The first light splitting element allows the second beam to pass through and be transmitted to the optical element along the second direction. The light spots formed on the optical element by the first sub beam of the first beam are at least partially overlapped with the light spots formed on the optical element by the second sub beam and the third sub beam of the second beam to form a first light spot group. The light spots formed on the optical element by the first sub beam of the second beam are at least partially overlapped with the light spots formed on the optical element by the second sub beam and the third sub beam of the first beam to form a second light spot group. The first light spot group and the second light spot group are arranged along the first direction. In order to achieve the above object and other related objects, the present disclosure provides a projection device. The projection device includes the aforementioned illumination system, a light valve module and a projection lens. The illumination system provides an illumination beam. The illumination beam includes at least one of the first beam and the second beam from the optical element. The light valve module is disposed on the transmission path of the illumination beam and is configured to convert the illumination beam into an image beam. The projection lens is disposed on the transmission path of the image beam and is configured to project the image beam out of the projection device. According to the above, the embodiments of the present disclosure at least have one of the following beneficial effects: The illumination system and projection device of the embodiments of the present disclosure allow at least two light spots to at least partially overlap on the optical element, which may effectively increase the brightness of the illumination beam without increasing the volume of the projection device. Other objectives, features and advantages