A five-channel LED light source structure for a projector

Abstract

The invention discloses a five-channel LED light source structure of a projector, including a first channel LED light source, a second channel LED light source, a third channel LED light source, a fourth channel LED light source, and a fifth channel LED light source; a first shaping lens group, used for approximately parallel light convergence of the outgoing light of the first channel LED light source; a second shaping lens group, used for approximately parallel light convergence of the outgoing light of the second channel LED light source; a third shaping lens group, used for approximately parallel light convergence of the outgoing light of the third channel LED light source; a fourth shaping lens group, used for approximately parallel light convergence of the outgoing light of the fourth channel LED light source; and a fifth shaping lens group, used for approximately parallel light convergence of the outgoing light of the fifth channel LED light source. Compared with the prior art, the invention makes the brightness of the projector no longer limited by the brightness of red and blue monochromatic light, and a better color state can be achieved without sacrificing brightness during white balance adjustment.

Description

Technical Field

[0001] The invention relates to the technical field of projection equipment, and in particular to a five-channel LED light source structure for a projector. Background Art

[0002] LED light source projectors usually use RGB light combination. Due to the different lighting effects of each color LED in the system, the overall brightness of the picture will be insufficient, and the color performance of the picture will be affected.

[0003] The current mainstream four-channel LED light source projector has a light source structure mainly composed of red, green, blue, and pump blue. The outgoing light beam of pump blue is projected onto the green LED fluorescent light-emitting surface through a shaping light path, providing additional energy to stimulate more green light and increase the brightness output. The four-channel light source light path produces red, green, and blue primary colors, which are combined into RGB light through a two-way color separation lens and enter the light homogenization device, and then pass through the rear relay end light path, display device, lens, and cooperate with electronic timing control to finally project a color image onto the screen.

[0004] At present, the four-channel structure only stimulates more green light due to pumping blue light, while the brightness of red and blue light is still restricted by the system's light efficiency. When adjusting the color, it is still necessary to sacrifice the brightness to achieve a better color state. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a five-channel LED light source structure for a projector, so that the brightness of the projector is no longer limited by the brightness of red and blue monochromatic light, and a better color state can be achieved without sacrificing brightness during white balance adjustment.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a five-channel LED light source structure of a projector, including a first channel LED light source, a second channel LED light source, a third channel LED light source, a fourth channel LED light source, and a fifth channel LED light source; a first shaping lens group, used for approximately parallel light convergence of the outgoing light of the first channel LED light source; a second shaping lens group, used for approximately parallel light convergence of the outgoing light of the second channel LED light source; a third shaping lens group, used for approximately parallel light convergence of the outgoing light of the third channel LED light source; a fourth shaping lens group, used for approximately parallel light convergence of the outgoing light of the fourth channel LED light source; a fifth shaping lens group, used for approximately parallel light convergence of the outgoing light of the fifth channel LED light source; a first relay lens, used for approximately parallel light shaping of the outgoing light of the first channel LED light source and the third channel LED light source;

[0007] A first dichroic mirror is used to combine the approximately parallel light emitted by the first channel LED light source, the second channel LED light source and the third channel LED light source;

[0008] A second dichroic mirror is used to combine the approximately parallel light emitted by the LED light source of the fourth channel with the first dichroic mirror;

[0009] A third dichroic mirror is used to combine the approximately parallel light emitted by the fifth channel LED light source with the first dichroic mirror;

[0010] The light homogenizing device is a compound eye lens for receiving the combined light from the second dichroic mirror and the third dichroic mirror and emitting light with uniform light intensity;

[0011] The second relay lens is used to shape the light emitted by the compound eye lens and transmit it to the rear optical path system;

[0012] A reflector, used for reflecting the outgoing light of the second relay lens to the rear optical path system;

[0013] The TIR total reflection prism is used to totally reflect the light emitted from the reflector and transmit it to the display device, and finally emit it through the projection lens to form an enlarged image;

[0014] The first dichroic mirror is located between the first shaping lens group and the first relay lens.

[0015] Furthermore, the second channel LED light source, the second shaping lens group and the third channel LED light source, the third shaping lens group are respectively located on both sides of the first dichroic mirror.

[0016] The first dichroic mirror forms an angle of 45° with the optical axis of the first channel LED light source 1, the optical axis of the second channel LED light source and the optical axis of the third channel LED light source.

[0017] The second dichroic mirror and the third dichroic mirror are located between the first relay lens and the fly-eye lens, and the second dichroic mirror intersects with the third dichroic mirror at a side close to the fly-eye lens, forming an angle of 90°.

[0018] The second dichroic mirror, the third dichroic mirror and the optical axis of the fly-eye lens all form an angle of 45 degrees.

[0019] The fourth channel LED light source and the fourth shaping lens group are located on one side of the second dichroic mirror, and their optical axes are reflected at 90° by the second dichroic mirror and intersect with the incident surface of the fly-eye lens at 1 / 4 of the right side of the fly-eye lens optical axis.

[0020] The approximately parallel light emitted by the fourth channel LED light source is reflected by the second dichroic mirror and enters the right half of the fly-eye lens.

[0021] The fifth channel LED light source and the fifth shaping lens group are located on one side of the third dichroic mirror, and their optical axes are reflected at 90° by the third dichroic mirror and intersect with the incident surface of the fly-eye lens at 1 / 4 of the left side of the fly-eye lens optical axis.

[0022] The approximately parallel light emitted by the fifth channel LED light source is reflected by the third dichroic mirror and enters the left half of the fly-eye lens.

[0023] The beneficial effects of the present invention are as follows: based on the current RGB / BP four-channel LED optical path, the present invention changes the channel of one red light beam into a two-channel red light source array structure for the red light beam with low efficiency in the system and which has a greater impact on the color saturation of the projector. The red light beam array abandons the large-angle edge light emitted by the LED light source, and makes full use of the central small-angle approximately parallel light beam, which is reflected by a dichroic mirror and combined at a compound eye lens, thereby improving the efficiency of the red light beam in the system, and greatly improving the brightness and color of the system.

[0024] The present invention can also be used to improve the efficiency of the blue light beam in the system by adjusting the light source channel structure and the dichroic mirror characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The structure and features of the present invention are further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 yes Figure 1 Schematic diagram of the light path. DETAILED DESCRIPTION

[0028] See attached Figure 1 and 2 An embodiment of the present invention discloses a five-channel LED light source structure for a projector, a five-channel LED light source structure for a projector, comprising a first channel LED light source 1, a second channel LED light source 2, a third channel LED light source 3, a fourth channel LED light source 4, and a fifth channel LED light source 5; a first shaping lens group 6, used for approximately parallel light convergence of the outgoing light of the first channel LED light source 1; a second shaping lens group 7, used for approximately parallel light convergence of the outgoing light of the second channel LED light source 2; a third shaping lens group 8, used for approximately parallel light convergence of the outgoing light of the third channel LED light source 3; a fourth shaping lens group 9, used for approximately parallel light convergence of the outgoing light of the fourth channel LED light source 4; a fifth shaping lens group 10, used for approximately parallel light convergence of the outgoing light of the fifth channel LED light source 5.

[0029] When the present invention is in use, the first relay lens 11 performs approximately parallel light shaping on the emitted light of the first channel LED light source 1 and the third channel LED light source 3; the first dichroic mirror 12 is used to combine the approximately parallel light emitted by the first channel LED light source 1, the second channel LED light source 2 and the third channel LED light source 3; the second dichroic mirror 13 is used to combine the approximately parallel light emitted by the fourth channel LED light source 4 with the first dichroic mirror 12; the third dichroic mirror 14 is used to combine the approximately parallel light emitted by the fifth channel LED light source 5 with the first dichroic mirror 12;

[0030] The light homogenizing device is a fly-eye lens for receiving the combined light from the second dichroic mirror 13 and the third dichroic mirror 14 and emitting light with uniform light intensity; the second relay lens 16 is used to shape the light emitted from the fly-eye lens 15 and transmit it to the rear-end optical path system; the reflector 17 is used to reflect the light emitted from the second relay lens 16 to the rear-end optical path system; the TIR total reflection prism 18 is used to totally reflect the light emitted from the reflector 17 and transmit it to the display device 19, and finally emit it through the projection lens 20 to present an enlarged image; the first dichroic mirror 12 is located between the first shaping lens group 6 and the first relay lens 11.

[0031] Furthermore, the second channel LED light source 2 , the second shaping lens group 7 and the third channel LED light source 3 , the third shaping lens group 8 are respectively located on both sides of the first dichroic mirror 12 .

[0032] The first dichroic mirror 12 forms an angle of 45° with the optical axis of the first channel LED light source 1 , the optical axis of the second channel LED light source 3 , and the optical axis of the third channel LED light source 3 .

[0033] The second dichroic mirror 13 and the third dichroic mirror 14 are located between the first relay lens 11 and the fly-eye lens 15 , and the second dichroic mirror 13 intersects with the third dichroic mirror 14 at a side close to the fly-eye lens 15 , forming an angle of 90°.

[0034] The second dichroic mirror 13 , the third dichroic mirror 14 and the fly-eye lens 15 all form an angle of 45° between their optical axes.

[0035] The fourth channel LED light source 4 and the fourth shaping lens group 9 are located on one side of the second dichroic mirror 13, and their optical axes are reflected at 90° by the second dichroic mirror 13 and intersect with the incident surface of the fly-eye lens 15 at the right 1 / 4 of the fly-eye lens optical axis.

[0036] The approximately parallel light emitted by the fourth channel LED light source 4 is reflected by the second dichroic mirror 13 and enters the right half of the fly-eye lens 15 .

[0037] The fifth channel LED light source 5 and the fifth shaping lens group 10 are located on one side of the third dichroic mirror 14, and their optical axes are reflected at 90° by the third dichroic mirror 14 and intersect with the incident surface of the fly-eye lens 15 at the left 1 / 4 of the fly-eye lens optical axis.

[0038] The approximately parallel light emitted by the fifth channel LED light source 5 is reflected by the third dichroic mirror 14 and enters the left half of the fly-eye lens 15 .

[0039] Through the above light source structure, the brightness of the projector is no longer limited by the brightness of red and blue monochromatic light, and a better color state can be achieved without sacrificing brightness during white balance adjustment.

[0040] The explanation of the above embodiments is only to help understand the implementation method of the present invention and its core idea. At the same time, for those skilled in the art in the relevant field of the present invention, according to the idea of ​​the present invention, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention. As long as the improvements made according to the present invention are not creative, they should be within the scope of protection of the present invention.

Claims

1. A five-channel LED light source structure for a projector, characterized in that: It includes a first channel LED light source, a second channel LED light source, a third channel LED light source, a fourth channel LED light source, and a fifth channel LED light source; A first shaping lens group is used to converge the emitted light of the first channel LED light source into approximately parallel light; The second shaping lens group is used to converge the emitted light of the second channel LED light source into approximately parallel light; The third shaping lens group is used to converge the emitted light of the third channel LED light source into approximately parallel light; The fourth shaping lens group is used for convergence of the emitted light of the fourth channel LED light source into approximately parallel light; The fifth shaping lens group is used for convergence of the emitted light of the fifth channel LED light source into approximately parallel light; A first relay lens is used to perform approximately parallel light shaping on the outgoing light of the first channel LED light source and the third channel LED light source; A first dichroic mirror is used to combine the approximately parallel light emitted by the first channel LED light source, the second channel LED light source and the third channel LED light source; A second dichroic mirror is used to combine the approximately parallel light emitted by the LED light source of the fourth channel with the first dichroic mirror; A third dichroic mirror is used to combine the approximately parallel light emitted by the fifth channel LED light source with the first dichroic mirror; The light homogenizing device is a compound eye lens for receiving the combined light from the second dichroic mirror and the third dichroic mirror and emitting light with uniform light intensity; The second relay lens is used to shape the light emitted by the compound eye lens and transmit it to the rear optical path system; A reflector, used for reflecting the outgoing light of the second relay lens to the rear optical path system; The TIR total reflection prism is used to totally reflect the light emitted from the reflector and transmit it to the display device, and finally emit it through the projection lens to form an enlarged image; The first dichroic mirror is located between the first shaping lens group and the first relay lens; The second channel LED light source, the second shaping lens group, and the third channel LED light source, the third shaping lens group are respectively located on both sides of the first dichroic mirror; The first dichroic mirror is at an angle of 45° to the optical axis of the first channel LED light source, the optical axis of the second channel LED light source, and the optical axis of the third channel LED light source; The second dichroic mirror and the third dichroic mirror are located between the first relay lens and the fly-eye lens, and the second dichroic mirror intersects with the third dichroic mirror at a side close to the fly-eye lens, forming an angle of 90°; The second dichroic mirror, the third dichroic mirror and the optical axis of the fly-eye lens all form an angle of 45°; The fourth channel LED light source and the fourth shaping lens group are located on one side of the second dichroic mirror, and the optical axis thereof is reflected at 90° by the second dichroic mirror and intersects with the incident surface of the fly-eye lens at the right 1 / 4 of the fly-eye lens optical axis; The approximately parallel light emitted by the LED light source of the fourth channel is reflected by the second dichroic mirror and enters the right half of the fly-eye lens; The fifth channel LED light source and the fifth shaping lens group are located on one side of the third dichroic mirror, and the optical axis thereof is reflected at 90° by the third dichroic mirror and intersects with the incident surface of the fly-eye lens at the left 1 / 4 of the fly-eye lens optical axis; The approximately parallel light emitted by the fifth channel LED light source is reflected by the third dichroic mirror and enters the left half of the fly-eye lens.

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