Single LCD projector

Abstract

The utility model provides a single LCD projector, the single LCD projector comprises a light source, an imaging assembly, an LCD screen and a lens assembly, light emitted by the light source passes through the imaging assembly, the LCD screen and the lens assembly in sequence; the imaging assembly comprises a light uniformizing rod, a first condensing lens, a second condensing lens and a Fresnel lens, light emitted by the light source is diffused when passing through the light uniformizing rod, and then the light passes through the first condensing lens, the second condensing lens and the Fresnel lens in sequence to be imaged to the LCD screen. The projector system is provided with the imaging assembly comprising the dodging rod, the first condensing lens, the second condensing lens and the Fresnel lens, and compared with a traditional non-imaging illumination mode, the illumination uniformity and the color uniformity of the projector system are obviously improved, so that the light source of the projector can adopt an RGB-COB light source, and the color gamut is higher.

Description

Technical Field

[0001] The present application relates to the technical field of projectors, and in particular to a single LCD projector. Background Art

[0002] Most existing single-LCD projectors directly place the light box and Fresnel lens in front of the LCD screen. This non-imaging lighting method results in poor illumination uniformity of the projector and poor color uniformity of the system. It cannot use RGB-COB light sources (a light source composed of an orderly arrangement of chips emitting red, green, and blue light), and the system's color gamut is low.

[0003] Therefore, it is necessary to provide a single LCD projector with better illumination uniformity and color uniformity. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a single LCD projector with better illumination uniformity and color uniformity.

[0005] According to the implementation scheme of the present utility model, a first solution is provided: a single LCD projector, which includes a light source, an imaging component, an LCD screen and a lens component. The light emitted by the light source passes through the imaging component, the LCD screen and the lens component in sequence; the imaging component includes a light homogenizing rod, a first focusing lens, a second focusing lens and a Fresnel lens. The light emitted by the light source is diffused when passing through the light homogenizing rod, and then passes through the first focusing lens, the second focusing lens and the Fresnel lens in sequence to form an image on the LCD screen.

[0006] In a preferred embodiment, central axes of the light homogenizing rod, the first condensing lens, and the second condensing lens coincide with each other.

[0007] In a preferred embodiment, the imaging assembly further includes a first reflector, and the light emitted from the light source is emitted from the second condensing lens and then reflected by the first reflector to enter the Fresnel lens.

[0008] In a preferred embodiment, the normal line of the incident surface of the Fresnel lens is perpendicular to the central axis of the light homogenizing rod.

[0009] In a preferred embodiment, the imaging assembly further includes a second reflector, which is located on the side of the Fresnel lens away from the first reflector. After the light emitted from the light source is emitted from the Fresnel lens, it passes through the second reflector and enters the LCD screen.

[0010] In a preferred embodiment, the angle between the reflective surface of the first reflector and the incident surface of the Fresnel lens is a first angle, the angle between the reflective surface of the second reflector and the incident surface of the Fresnel lens is a second angle, and both the first angle and the second angle are 45°.

[0011] In a preferred solution, heat-insulating glass is further provided between the LCD screen and the second reflector.

[0012] In a preferred embodiment, the first condensing lens is a biconvex lens, the second condensing lens is a concave-convex lens, and the second condensing lens is convex on the side away from the first condensing lens and concave on the side facing the light homogenizing rod.

[0013] In a preferred embodiment, the light homogenizing rod is in the shape of a quadrangular pyramid, and the cross section of the light homogenizing rod gradually increases in a direction away from the light source.

[0014] In a preferred solution, the light source is an RGB-COB light source.

[0015] The utility model has the following beneficial effects:

[0016] The present application is provided with an imaging assembly including a light-homogenizing rod, a first focusing lens, a second focusing lens and a Fresnel lens. Different from the traditional non-imaging lighting method, the illumination uniformity and color uniformity of the projector system are significantly improved, so that the light source of the projector can adopt an RGB-COB light source with a higher color gamut. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a single LCD projector according to an embodiment of the present invention;

[0018] Figure 2 FIG. 1 is a schematic diagram of imaging of a single LCD projector according to an embodiment of the present invention.

[0019] Reference numerals: 10, light source; 20, imaging assembly; 21, light homogenizer; 22, first condensing lens; 23, second condensing lens; 24, Fresnel lens; 25, first reflector; 26, second reflector; 27, heat-insulating glass; 30, LCD screen; 40, lens assembly; DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0021] It should be noted that when an element is referred to as being “fixed on” or “set on” another component, it can be directly on the other component or indirectly set on the other component; when a component is referred to as being “connected to” another component, it can be directly connected to the other component or indirectly connected to the other component.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0025] Please refer to Figure 1 and Figure 2One embodiment of the present invention provides a single LCD projector, which includes a light source 10, an imaging assembly 20, an LCD screen 30, and a lens assembly 40. The light from the light source 10 passes through the imaging assembly 20, the LCD screen 30, and the lens assembly 40 in sequence. The imaging assembly 20 includes a light homogenizer 21, a first condenser lens 22, a second condenser lens 23, and a Fresnel lens 24. The light from the light source 10 can pass through the light homogenizer 21, the first condenser lens 22, the second condenser lens 23, and the Fresnel lens 24 in sequence to form an image on the LCD screen 30. Finally, the light is emitted from the lens assembly 40 to project the image to the outside of the projector. The light from the light source 10 can be homogenized and shaped in the light homogenizer 21, and a certain degree of diffusion occurs when it exits the light homogenizer 21. Then, it forms two focused beams when passing through the first condenser lens 22 and the second condenser lens 23, respectively, and then collimated by the Fresnel lens 24 to form an image on the LCD screen 30.

[0026] In this embodiment, the single LCD projector is provided with an imaging assembly 20 including a light-homogenizing rod 21, a first focusing lens 22, a second focusing lens 23 and a Fresnel lens 24. Different from the traditional non-imaging lighting method, the illumination uniformity and color uniformity of the projector are significantly improved, so that the light source 10 of the projector can adopt an RGB-COB light source with a higher color gamut.

[0027] In one embodiment, reference may be made to Figure 1 The light homogenizer 21, the first condensing lens 22, and the second condensing lens 23 are spaced apart from each other, and the central axes of the light homogenizer 21, the first condensing lens 22, and the second condensing lens 23 coincide with each other. Specifically, the light homogenizer 21 is disposed on the light-emitting side of the light source 10, the first condensing lens 22 is spaced apart from each other on the side of the light homogenizer 21 facing away from the light source 10, and the second condensing lens 23 is spaced apart from each other on the side of the first condensing lens 22 facing away from the light homogenizer 21.

[0028] In one embodiment, the imaging assembly 20 further includes a first reflector 25. After the light from the light source 10 is emitted from the second condenser lens 23, it is reflected by the first reflector 25 and then enters the Fresnel lens 24. In this embodiment, the provision of the first reflector 25 can change the direction of the light path, thereby making the internal structure of the projector more compact, thereby reducing the size of the projector.

[0029] Furthermore, the imaging assembly 20 also includes a second reflector 26 , which is located on the side of the Fresnel lens 24 away from the first reflector 25 . After the light from the light source 10 is emitted from the Fresnel lens 24 , it passes through the second reflector 26 and enters the LCD screen 30 .

[0030] Preferably, refer to Figure 1 and Figure 2The normal to the incident surface of the Fresnel lens 24 is perpendicular to the central axis of the light homogenizing rod 21. The angle between the reflective surface of the first reflector 25 and the incident surface of the Fresnel lens 24 is a first angle, and the angle between the reflective surface of the second reflector 26 and the incident surface of the Fresnel lens 24 is a second angle, both of which are 45°. In this embodiment, after reflection by the second reflector 26, the direction of the light path changes again, and both the first angle and the second angle are 45°, so that the illumination direction of the light source 10 and the light output direction of the lens assembly 40 are approximately parallel and opposite, making the internal structure of the projector more compact, thereby further reducing the size of the projector.

[0031] In a preferred embodiment, a heat-insulating glass 27 is further provided between the LCD screen 30 and the second reflector 26 . The provision of the heat-insulating glass 27 can minimize the influence of the heat in the imaging assembly 20 on the performance of the LCD screen 30 .

[0032] In a specific embodiment, reference may be made to Figure 1 The first condensing lens 22 is a biconvex lens, and the convexity of its light-emitting side is smaller than the convexity of its light-incident side. The second condensing lens 23 is a concave-convex lens, and the second condensing lens 23 is convex on the side away from the first condensing lens 22, and concave on the side of the second condensing lens 23 facing the light homogenizing rod 21. The convexity of the second condensing lens 23 at the convex part is greater than the concave degree at the concave part.

[0033] In a preferred embodiment, the light homogenizing rod 21 is in the shape of a quadrangular pyramid. Light exiting the light homogenizing rod 21 forms a rectangular light spot. The cross section of the light homogenizing rod 21 gradually increases in a direction away from the light source 10 .

[0034] In a preferred embodiment, due to the use of imaging lighting, the illumination uniformity and color uniformity of the projector are significantly improved, so that the light source 10 of the projector can adopt an RGB-COB light source, and multiple chips emitting red, green and blue light are arranged in an orderly manner to form the light source 10. Figure 1 The light source 10 is fixed on the smaller bottom surface of the prism-shaped light-homogenizing rod 21. After the projector adopts the RGB-COB light source, the color gamut is higher than that of the monochromatic white light source 10.

[0035] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 single LCD projector, characterized in that: The system comprises a light source, an imaging component, an LCD screen and a lens component. The light emitted by the light source passes through the imaging component, the LCD screen and the lens component in sequence. The imaging component comprises a light homogenizing rod, a first condensing lens, a second condensing lens and a Fresnel lens. The light emitted by the light source diffuses when passing through the light homogenizing rod, and then passes through the first condensing lens, the second condensing lens and the Fresnel lens in sequence to form an image on the LCD screen.

2. The single LCD projector according to claim 1, wherein: Central axes of the light homogenizing rod, the first condensing lens, and the second condensing lens coincide with each other.

3. The single LCD projector according to claim 2, wherein: The imaging assembly further includes a first reflector. After the light emitted from the light source is emitted from the second condensing lens, it is reflected by the first reflector and then enters the Fresnel lens.

4. The single LCD projector according to claim 3, wherein: The normal line of the incident surface of the Fresnel lens is perpendicular to the central axis of the light homogenizing rod.

5. The single LCD projector according to claim 4, wherein: The imaging assembly further includes a second reflector, which is located on a side of the Fresnel lens away from the first reflector. After the light emitted from the light source is emitted from the Fresnel lens, it passes through the second reflector and is emitted into the LCD screen.

6. The single LCD projector according to claim 5, wherein: The angle between the reflective surface of the first reflector and the incident surface of the Fresnel lens is a first angle, the angle between the reflective surface of the second reflector and the incident surface of the Fresnel lens is a second angle, and both the first angle and the second angle are 45°.

7. The single LCD projector according to claim 5, wherein: Heat-insulating glass is also provided between the LCD screen and the second reflector.

8. The single LCD projector according to claim 1, wherein: The first condensing lens is a biconvex lens, and the second condensing lens is a concave-convex lens. The second condensing lens is convex on a side away from the first condensing lens, and concave on a side facing the light homogenizing rod.

9. The single LCD projector according to any one of claims 1 to 8, characterized in that: The light homogenizing rod is in the shape of a quadrangular pyramid, and the cross section of the light homogenizing rod gradually increases in a direction away from the light source.

10. The single LCD projector according to any one of claims 1 to 8, characterized in that: The light source is an RGB-COB light source.

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