A high-brightness LED projection device

Abstract

The present invention discloses a high-brightness LED projection device, comprising: a light combining system, an illumination system, and an imaging system. The illumination system includes a fly-eye lens, a first relay lens, an RTIR prism, and a projection display chip. The light combining system is used to combine the light beams emitted by a light source and transmit them to the fly-eye lens. The light beams after passing through the fly-eye lens are transmitted to the first relay lens. The first relay lens is used to transmit the received light beams to the projection display chip via the RTIR prism. The RTIR prism is used to receive the light beams reflected by the projection display chip, reflect the light beams reflected by the projection display chip when it is turned on, and reflect them to the imaging system for projection imaging. The light beams reflected by the projection display chip when it is turned off do not enter the imaging system. The present invention can improve the imaging display contrast during use, which is beneficial for enhancing the user viewing experience.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of projection display technology, and in particular to a high-brightness LED projection device. Background Art

[0002] At present, LED projection equipment is being used more and more widely in people's daily lives. As people's living standards continue to improve, people's requirements for LED projection equipment are also getting higher and higher. As the performance and size of LED projection equipment continue to improve, the brightness of LED projection equipment is getting higher and higher. However, simply increasing the brightness of LED projection equipment will lead to a decrease in the picture contrast of the LED projection equipment, affecting the user's viewing experience.

[0003] In view of this, how to provide a high-brightness LED projection device with high contrast becomes a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a high-brightness LED projection device, which can improve the contrast of the display image during use and enhance the user's viewing experience.

[0005] To solve the above technical problems, an embodiment of the present invention provides a high-brightness LED projection device, comprising: a light combining system, an illumination system, and an imaging system. The illumination system includes a fly-eye lens, a first relay lens, an RTIR prism, and a projection display chip, wherein:

[0006] The light combining system is used to combine the light beams emitted by the light source and transmit them to the fly-eye lens, and the light beams after passing through the fly-eye lens are transmitted to the first relay lens;

[0007] The first relay lens is used to transmit the received light beam to the projection display chip via the RTIR prism;

[0008] The RTIR prism is used to receive the light beam reflected by the projection display chip, reflect the light beam reflected by the projection display chip in the on state to the imaging system for projection imaging, and prevent the light beam reflected by the projection display chip in the off state from entering the imaging system.

[0009] Optionally, the illumination system further includes a second relay lens and a reflector between the first relay lens and the RTIR prism, wherein:

[0010] The first relay lens is specifically configured to transmit the received light beam to the reflector;

[0011] The reflector is used to reflect the light beam to the second relay lens, and transmit the light beam to the RTIR prism through the second relay lens.

[0012] Optionally, the second relay lens is a relay lens made of glass.

[0013] Optionally, the first relay lens is a relay lens made of plastic.

[0014] Optionally, the second relay lens is a spherical relay lens.

[0015] Optionally, the center thickness of the second relay lens is less than 10 mm, the curvature radius of the light incident surface of the second relay lens is in the range of (0, 100 mm), and the curvature radius of the light emitting surface is greater than 200 mm.

[0016] Optionally, the light combining system, the lighting system and the imaging system form a U-shaped structure.

[0017] Optionally, the distance between the fly-eye axis of the fly-eye lens and the end face of the projection display chip is not less than 50 mm.

[0018] The present invention provides a high-brightness LED projection device, comprising: a light combining system, an illumination system, and an imaging system, wherein the illumination system comprises a fly-eye lens, a first relay lens, an RTIR prism, and a projection display chip, wherein: the light combining system is used to combine the light beam emitted by the light source and transmit it to the fly-eye lens, the light beam after passing through the fly-eye lens is transmitted to the first relay lens, the first relay lens is used to transmit the received light beam to the projection display chip via the RTIR prism; the RTIR prism is used to receive the light beam reflected by the projection display chip, reflect the light beam reflected by the projection display chip when it is in the on state to the imaging system for projection imaging, and prevent the light beam reflected by the projection display chip when it is in the off state from entering the imaging system. It can be seen that the high-brightness LED projection device of the present invention transmits the light beam emitted by the light source to the imaging system through the light combining system, and because the illumination system of the present invention is provided with an RTIR prism, the RTIR prism can reflect as much of the light beam reflected by the projection display chip when it is in the on state as possible to the imaging system, and reflect as little of the light beam reflected by the projection display chip when it is in the off state to the imaging system as possible, thereby improving the display contrast and facilitating an enhanced user viewing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1A schematic structural diagram of a high-brightness LED projection device provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a light path in the DMD_Off state provided by an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of another high-brightness LED projection device provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a light spot incident on a first relay lens provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a light spot emitted from the second relay lens 25 provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The embodiment of the present invention provides a high-brightness LED projection device, which can improve the contrast of the display image during use and enhance the user viewing experience.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a high-brightness LED projection device provided by an embodiment of the present invention. The high-brightness LED projection device includes: a light combining system 1, an illumination system 2, and an imaging system 3. The illumination system 2 includes a fly-eye lens 21, a first relay lens 22, an RTIR prism 23, and a projection display chip 24, wherein:

[0028] The light combining system 1 is used to combine the light beams emitted by the light source and transmit them to the fly-eye lens 21. The light beams after passing through the fly-eye lens 21 are transmitted to the first relay lens 22.

[0029] The first relay lens 22 is used to transmit the received light beam to the projection display chip 24 via the RTIR prism 23;

[0030] The RTIR prism 23 is used to receive the light beam reflected by the projection display chip 24, and reflect the light beam reflected by the projection display chip 24 when it is in the on state to the imaging system 3 for projection imaging, and prevent the light beam reflected by the projection display chip 24 when it is in the off state from entering the imaging system 3.

[0031] in, Figure 1 The light A is the incident light and the light B is the outgoing light.

[0032] Specifically, the light combining system 1 in the embodiment of the present invention combines the light beams emitted by the light source and transmits them to the fly-eye lens 21 in the illumination system 2. Specifically, the optical axis of the light combining system 1 and the optical axis of the fly-eye lens 21 can be in a straight line, wherein the fly-eye lens 21 is composed of a plurality of small double convex lens arrays, and its function is to divide the light spot entering the fly-eye lens 21 into a plurality of sub-light sources, and each sub-light source is superimposed and distributed on the projection display chip (such as DMD) 24 after passing through the first relay lens 22 (a relay lens with positive optical focal length) and the RTIR prism 23. The main function of the first relay lens 22 and the RTIR prism 23 is to transfer the light of each cell of the fly-eye lens 21 to the DMD, and ensure that the light spots of each cell hitting the DMD overlap as much as possible, and then the light is reflected by the DMD and shot into the imaging system through the RTIR prism 23. Among them, the size of the fly-eye lens 21 is a*b, where a and b represent the length and width of the fly-eye lens respectively. The angle of the light spot incident on the fly-eye lens 21 is θ*Ф, where θ and Ф represent the divergence angles of the light spot on the long side and the short side respectively, and satisfy the relationship: a*sin(θ)>3 and b*sin(Ф)>1.5.

[0033] It should be noted that the projection display chip 24 in the on state (ie, DMD_On) is used to display a white field image, and the projection display chip 24 in the off state (ie, DMD_Off) is used to display a dark field image. The contrast of the projection device can be improved by allowing as much light as possible in the DMD_On state to pass through the imaging system 3 and project onto the screen, and allowing as little light as possible in the DMD_Off state to pass through the imaging system 3 and project onto the screen. For details, please refer to Figure 1 and Figure 2 Because the imaging system is offset away from light in the DMD offset state, light in the DMD_Off state is less likely to enter the imaging system 3, resulting in a darker field of view. Furthermore, the RTIR prism 23 in this embodiment of the present invention can compensate for the optical path differences of light entering the DMD at various angles, making the light spot shape more symmetrical. Furthermore, the refractive index of both prisms in the RTIR prism 23 does not exceed 1.8.

[0034] Further, such as Figure 3 In the high-brightness LED projection device shown in FIG, the illumination system 2 in the embodiment of the present invention further includes a second relay lens 25 and a reflector 26 between the first relay lens 22 and the RTIR prism 23, wherein:

[0035] The first relay lens 22 transmits the received light beam to the reflective mirror 26 . The reflective mirror 26 reflects the light beam to the second relay lens 25 , and transmits the light beam to the RTIR prism 23 through the second relay lens 25 .

[0036] It should be noted that in order to better transfer the light from each cell of the fly-eye lens 21 to the DMD and better ensure that the light spots of each cell hitting the DMD overlap as much as possible, a second relay lens 25 and a reflector 26 can also be provided in the illumination system 2 in the embodiment of the present invention. The reflector 26 can be used to redirect the light path and fold the light path, which is beneficial to reducing the volume of the entire optical system so as to miniaturize the product. In addition, the first relay lens 22 and the second relay lens 25 in the embodiment of the present invention are both lenses with positive optical power. By providing the second relay lens 25, the light beam passing through the fly-eye lens 21 can be better focused.

[0037] It should be noted that a protective glass 27 is provided on the projection display chip 24 to protect the projection display chip 24. Figure 3 shown.

[0038] Furthermore, the second relay lens 25 is a relay lens made of glass.

[0039] It should be noted that the size of the light spot incident on the first relay lens 22 is as follows: Figure 4 As shown, the size of the output light spot of the second relay lens 25 is as follows: Figure 5 As shown by Figure 4 and Figure 5 It can be seen that the spot size of the light exiting the second relay lens 25 is reduced, and the energy is mainly concentrated in the center area, resulting in a high optical power density. In other words, the second relay lens 25 is subjected to a large energy impact. Therefore, to improve the reliability of the second relay lens 25 while ensuring the performance of the lighting system 2, the second relay lens 25 can be made of glass. The center thickness of the second relay lens 25 is less than 10 mm, the curvature radius of the light incident surface of the second relay lens 25 ranges from (0 to 100 mm), and the curvature radius of the light exit surface is greater than 200 mm.

[0040] Furthermore, in order to further improve the reliability of the overall lighting system, the first relay lens 22 in the embodiment of the present invention may also be a relay lens made of glass.

[0041] Furthermore, in order to achieve better optical convergence, the second relay lens 25 in the embodiment of the present invention can adopt a spherical relay lens. Since plastic aspheric surfaces have high design freedom and low cost, the first relay lens 22 can adopt a plastic aspheric design. When a plastic aspheric relay lens is adopted, the center thickness of the first relay lens 22 can be less than 8 mm, the curvature radius range can be (-200, 200), and the cone coefficient range can be (-15, 15).

[0042] Of course, in order to further improve the light convergence effect, the first relay lens 22 may also be a glass spherical relay lens.

[0043] Specifically, in order to further reduce the volume of the entire high-gloss LED projection device and miniaturize the product, the light combining system 1, the lighting system 2 and the imaging system 3 in the present application can form a U-shaped structure, and the distance between the fly-eye axis of the fly-eye lens 21 and the end face of the projection display chip 24 is not less than 50 mm. Figure 3 shown.

[0044] It can be seen that the high-brightness LED projection device in the present invention transmits the light beam emitted by the light source to the imaging system through the light combining system, and since the lighting system in the present invention is provided with an RTIR prism, the RTIR prism can reflect as much of the light beam reflected by the projection display chip in the on state as possible to the imaging system, and reflect as little of the light beam reflected by the projection display chip in the off state as possible to the imaging system, thereby improving the display contrast and helping to enhance the user viewing experience.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0046] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0047] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-brightness LED projection device, characterized in that: include: A light combining system, an illumination system, and an imaging system, wherein the illumination system includes a fly-eye lens, a first relay lens, an RTIR prism, and a projection display chip, wherein: The light combining system is used to combine the light beams emitted by the light source and transmit them to the fly-eye lens, and the light beams after passing through the fly-eye lens are transmitted to the first relay lens; The first relay lens is used to transmit the received light beam to the projection display chip via the RTIR prism; The RTIR prism is used to receive the light beam reflected by the projection display chip, reflect the light beam reflected by the projection display chip in the on state to the imaging system for projection imaging, and prevent the light beam reflected by the projection display chip in the off state from entering the imaging system; wherein: The imaging system is offset in a direction away from the light in the offset state of the projection display chip; the RTIR prism is also used to compensate for the optical path difference of light entering the projection display chip at various angles, and the refractive index of the two prisms in the RTIR prism does not exceed 1.8; The illumination system further includes a second relay lens and a reflector between the first relay lens and the RTIR prism, wherein: The first relay lens is specifically configured to transmit the received light beam to the reflector; The reflector is used to reflect the light beam to the second relay lens and transmit the light beam to the RTIR prism through the second relay lens; The second relay lens is a spherical relay lens, the center thickness of the second relay lens is less than 10 mm, the curvature radius of the light incident surface of the second relay lens is in the range of (0, 100 mm), and the curvature radius of the light exit surface is greater than 200 mm; the center thickness of the first relay lens is less than 8 mm, the curvature radius range is (-200, 200), and the conic coefficient range is (-15, 15); The distance between the fly-eye axis of the fly-eye lens and the end face of the projection display chip is not less than 50 mm; the size of the fly-eye lens is a*b, a and b represent the length and width of the fly-eye lens respectively, and the angle of the light spot incident on the fly-eye lens is θ*Φ, θ and Φ represent the divergence angles of the light spot on the long side and the short side respectively, and satisfy the relationship: a*sin(θ)>3 and b*sin(Φ)>1.

5.

2. The high-brightness LED projection device according to claim 1, characterized in that: The second relay lens is a relay lens made of glass.

3. The high-brightness LED projection device according to claim 2, characterized in that: The first relay lens is a relay lens made of plastic.

4. The high-brightness LED projection device according to claim 1, characterized in that: The light combining system, the lighting system and the imaging system form a U-shaped structure.

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