Miniaturized monolithic LCD projection light path

Abstract

A miniaturized single-chip LCD projection light path comprises a light source, a lens, heat insulation glass, an LCD screen, a Fresnel lens, a reflector and a projection lens which are sequentially arranged in the light advancing direction. The light source is an LED light source, LED lamps in the LED light source are arranged in a rectangular array at equal intervals, the lens is an aspherical lens array, the aspherical lens array is a rectangular array and is arranged at equal intervals, and aspherical lenses in the aspherical lens array are in one-to-one correspondence with the LED lamps in the LED light source respectively. According to the utility model, the defects in the prior art are overcome, and the LED lamps are arranged into the rectangular array and matched with the aspheric collimating lens array to replace a reflection cup and a rear Fresnel lens structure in the prior art, so that the thickness of the whole light path is smaller. Therefore, the size of the projector can be greatly reduced, and the miniaturization of the projector is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of projection, and particularly relates to a miniaturized single-chip LCD projection optical path. Background Art

[0002] An LCD projector is a type of projector. The LCD projector has the advantages of good color reproduction, high resolution, small size, and light weight, and is very convenient to carry. Currently, it is the mainstream product in the projector market.

[0003] Traditional single-chip LCD projectors usually include components such as a light source, a reflector cup, a rear Fresnel lens, and an LCD display panel. Among them, the reflector cup and the rear Fresnel lens are used to uniformly direct the light emitted by the light source to the LCD display panel, and then project a clear image. However, these traditional components not only increase the volume and weight of the projector, but also may reduce the light utilization efficiency. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a miniaturized single-chip LCD projection optical path, which overcomes the deficiencies of the prior art, is reasonably designed, and by adopting the cooperation of a rectangular array of LED lights and an aspherical collimating lens array to replace the reflector cup and rear Fresnel lens structure in the prior art, the thickness of the entire optical path is smaller. Thus, the size of the projector can be greatly reduced to achieve the miniaturization of the projector.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0006] A miniaturized single-chip LCD projection optical path includes a light source, a lens, a heat-insulating glass, an LCD screen, a Fresnel lens, a reflector, and a projection lens arranged in sequence along the light traveling direction;

[0007] The light source is an LED light source, the LED lights in the LED light source are arranged in a rectangular array and at equal intervals, the lens is an aspherical lens array, the aspherical lens array is arranged in a rectangular array and at equal intervals, and each aspherical lens in the aspherical lens array corresponds to each LED light in the LED light source one by one.

[0008] Preferably, the reflector is a plane reflector, the optical axis of the Fresnel lens forms a 45° angle with the reflector, the optical axis of the projection lens forms a 45° angle with the reflector, and the reflector reflects the light emitted from the front Fresnel lens by 90° and then enters the projection lens.

[0009] Preferably, the surface of the heat-insulating glass is coated with a polarization film and a brightness enhancement film.

[0010] Preferably, one side of the Fresnel lens is a plane mirror, and the other side is a convex lens with threads, and the plane mirror faces the LCD screen.

[0011] The present invention provides a miniaturized single-chip LCD projection optical path, which has the following beneficial effects: By using a rectangular array of LED lights and an aspherical collimating lens array in cooperation to replace the reflector cup and the rear Fresnel lens structure, the thickness of the entire optical path is smaller. Thus, the size of the projector can be greatly reduced to achieve the miniaturization of the projector.

[0012] At the same time, by arranging the LED lights in a rectangular array as the light source output, and then by using an aspherical lens array, the ordinary illumination optical path is changed. Through the optical path refraction of the aspherical lens array and the combination of the overall array, the approximate Gaussian light of the lamp beads is shaped into flat-top light, greatly improving the light uniformity of the illumination surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the prior art.

[0014] Figure 1 Schematic structural diagram of the present invention;

[0015] Explanation of the reference numerals in the drawings:

[0016] 1. Light source; 2. Lens; 3. Heat-insulating glass; 4. LCD screen; 5. Fresnel lens; 6. Reflecting mirror; 7. Projection lens. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the purpose, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention.

[0018] Embodiment 1, as Figure 1 shown, a miniaturized single-chip LCD projection optical path includes a light source 1, a lens 2, a heat-insulating glass 3, an LCD screen 4, a Fresnel lens 5, a reflecting mirror 6 and a projection lens 7 arranged in sequence along the light traveling direction;

[0019] The light source 1 is an LED light source, the LED lights in the LED light source are arranged in a rectangular array and at equal intervals, the lens 2 is an aspherical lens array, the aspherical lens array is arranged in a rectangular array and at equal intervals, and each aspherical lens in the aspherical lens array corresponds to each LED light in the LED light source one by one.

[0020] Working principle:

[0021] During operation, each LED light source in the rectangular array emits a natural white light beam. After being collimated by the aspherical lens array 2, the light beam enters the heat-insulating glass 3, and then the heat-insulating glass 3 converts the natural light emitted by the LED light source into the polarized light required by the LCD screen 4. After the light beam exits from the LCD screen 4, the Fresnel lens 5 collects the light passing through the LCD screen 4 and reflects it into the projection lens 7 by the reflector 6, so that the image generated by the LCD screen 4 is magnified and projected through the projection lens 7.

[0022] In this embodiment, by using the combination of the rectangular array of LED lights and the aspherical collimating lens array to replace the reflector cup and the rear Fresnel lens structure in the prior art, the thickness of the entire optical path is smaller. Thus, the size of the projector can be greatly reduced to achieve miniaturization of the projector. In addition, by arranging the LED lights in a rectangular array as the light source output and then using the aspherical lens array, the ordinary illumination optical path is changed. Through the refraction of the optical path of the aspherical lens array and the combination of the overall array, the approximate Gaussian light of the lamp beads is shaped into flat-top light, greatly improving the light uniformity of the illumination surface.

[0023] Embodiment 2, as a further preferred solution of Embodiment 1, the reflector 6 is a plane mirror, the optical axis of the Fresnel lens 5 forms a 45° angle with the reflector 6, and the optical axis of the projection lens 7 forms a 45° angle with the reflector 6. The reflector 6 reflects the light beam exiting from the front Fresnel lens 5 by 90° and then enters the projection lens 7. By using the reflector 8, the direction of the light beam exiting from the front Fresnel lens 7 can be changed, so that the optical path structure can be more compact, and thus the size of the LCD projector can be made more miniaturized.

[0024] Embodiment 3, as a further preferred solution of Embodiment 1, the surface of the heat-insulating glass 3 is coated with a polarization film and a brightness enhancement film. By setting the polarization film to absorb stray light, and by setting the brightness enhancement film, the light brightness can be improved.

[0025] Embodiment 4, as a further preferred solution of Embodiment 1, one side of the Fresnel lens 5 is a plane mirror, and the other side is a convex lens with threads. The plane mirror faces the LCD screen 4. Thus, the light beam output by the front Fresnel lens 7 can form a focusing effect. Thus, the miniaturization of the projection lens 7 can be ensured.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A miniaturized single-chip LCD projection optical path, comprising a light source (1), a lens (2), a heat-insulating glass (3), an LCD screen (4), a Fresnel lens (5), a reflector (6) and a projection lens (7) arranged in sequence along the light traveling direction; It is characterized in that: The light source (1) is an LED light source, the LED lights in the LED light source are arranged in a rectangular array and equally spaced, the lens (2) is an aspherical lens array, the aspherical lens array is arranged in a rectangular array and equally spaced, and each aspherical lens in the aspherical lens array corresponds to each LED light in the LED light source one by one; One side of the Fresnel lens (5) is a plane mirror, and the other side is a convex lens with threads, and the plane mirror faces the LCD screen (4).

2. A miniaturized single-chip LCD projection optical path according to claim 1, characterized in that: The reflector (6) is a plane reflector, the optical axis of the Fresnel lens (5) forms a 45° angle with the reflector (6), the optical axis of the projection lens (7) forms a 45° angle with the reflector (6), and the reflector (6) reflects the light emitted from the front Fresnel lens (5) by 90° and then enters the projection lens (7).

3. A miniaturized single-chip LCD projection optical path according to claim 1, characterized in that: The surface of the heat-insulating glass (3) is coated with a polarization film and a brightness enhancement film.

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