Low-cost liquid crystal projector

Abstract

The utility model relates to a low-cost liquid crystal projector which comprises an LED lamp module, an optical polarizing film, a light hopper, an LCD light valve, a first Fresnel lens, a liquid crystal display screen, a second Fresnel lens, a reflecting mirror and a projection lens, and an optical path is arranged between the LED lamp module and the projection lens. The optical polarizing film, the light hopper, the LCD light valve, the first Fresnel lens, the liquid crystal display screen, the second Fresnel lens and the reflector are sequentially arranged at intervals in the length direction of an optical path. Through the front optical polarizer, the size of the optical polarizer does not need to be increased along with the enlargement of the size of the liquid crystal display screen, the cost of the optical polarizer is effectively reduced, and the overall production cost of the liquid crystal projector is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of projector technology, and specifically to a low-cost liquid crystal projector. Background Technology

[0002] Currently, the optical polarizers in LCD projectors are tightly integrated with the LCD screen to ensure effective light modulation and high-quality image output. However, with the increasing market demand for high-brightness LCD projectors, the larger size of the LCD screen necessitates a corresponding increase in the size of the required optical polarizer. Larger optical polarizers are not only complex to manufacture but also expensive, significantly increasing the overall production cost of LCD projectors.

[0003] Therefore, there is an urgent need to provide a low-cost LCD projector to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and defects of the existing technology and provide a low-cost liquid crystal projector that effectively reduces the cost of optical polarizers, thereby reducing the overall production cost of the liquid crystal projector.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A low-cost liquid crystal projector includes an LED lamp module, an optical polarizer, an optical chamber, an LCD light valve, a first Fresnel lens, a liquid crystal display screen, a second Fresnel lens, a reflector, and a projection lens. An optical path is provided between the LED lamp module and the projection lens. The optical polarizer, optical chamber, LCD light valve, first Fresnel lens, liquid crystal display screen, second Fresnel lens, and reflector are arranged sequentially at intervals along the length of the optical path.

[0007] As a preferred embodiment of this utility model, the liquid crystal display screen is an LCD display screen.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] This invention places an optical polarizer at the light source emission point of the LED lamp module, causing the light emitted by the LED lamp module to be polarized at the emission point by the optical polarizer before being modulated by other optical elements. By using a pre-positioned optical polarizer, the size of the optical polarizer does not need to increase with the size of the LCD screen, effectively reducing the cost of the optical polarizer and consequently lowering the overall production cost of the LCD projector. Attached Figure Description

[0010] Figure 1This is a schematic diagram of the structure of this utility model.

[0011] The above figures include the following reference numerals:

[0012] 1. LED light module, 2. Optical polarizer, 3. Light filter, 4. LCD light valve, 5. First Fresnel lens, 6. Liquid crystal display screen, 7. Second Fresnel lens, 8. Reflector, 9. Projection lens, 10. Screen. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0014] The specific implementation process of this utility model is as follows:

[0015] like Figure 1As shown, a low-cost LCD projector includes an LED lamp module 1, an optical polarizer 2, a light chamber 3, an LCD light valve 4, a first Fresnel lens 5, a liquid crystal display screen 6, a second Fresnel lens 7, a reflector 8, and a projection lens 9. An optical path is provided between the LED lamp module 1 and the projection lens 9. The optical polarizer 2, light chamber 3, LCD light valve 4, first Fresnel lens 5, liquid crystal display screen 6, second Fresnel lens 7, and reflector 8 are arranged sequentially at intervals along the length of the optical path. Specifically, the LED lamp module 1 serves as the light source of the projection system. The unpolarized light emitted by the LED lamp module 1 is first polarized by the optical polarizer 2, which is placed at the light source emission point of the LED lamp module 1, converting the unpolarized light into polarized light. The light chamber 3 then collects the polarized light and guides it to the LCD light valve 4. The LCD light valve 4 performs zoned backlight control of the light. The LCD light valve 4 adjusts the amount of transmitted light according to the input signal, thereby achieving precise control of the backlight and optimizing the contrast and brightness of the displayed image. The light, after being processed by the LCD light valve 4, is then uniformly incident on the first Fresnel lens 5. The polarized light, after being uniformly incident by the first Fresnel lens 5, enters the liquid crystal display screen 6 for modulation. The liquid crystal display screen 6 controls the amount of light transmitted to each pixel according to the input signal, thereby displaying the image. The light modulated by the liquid crystal display screen 6 then enters the second Fresnel lens 7 for further uniformization, ensuring the brightness uniformity of the image across the entire display area. The uniformly incident light is then reflected by the reflector 8, which reflects the light after being uniformly incident by the second Fresnel lens 7 into the projection lens 9. Finally, the projection lens 9 focuses and adjusts the light reflected from the reflector 8, ultimately projecting it onto the screen 10 to form an image. The light emitted by the LED light module 1 sequentially passes through the optical polarizer 2, light valve 3, LCD light valve 4, first Fresnel lens 5, liquid crystal display screen 6, second Fresnel lens 7, reflector 8, and projection lens 9, thus forming the displayed image. This application solves the problem in the prior art that the large size of the high-brightness liquid crystal display screen 6 leads to a corresponding increase in the size of the required optical polarizer 2. In this application, the size of the optical polarizer 2 does not need to increase with the size of the liquid crystal display screen 6, which effectively reduces the cost of the optical polarizer 2 and thus reduces the overall production cost of the liquid crystal projector.

[0016] In the embodiments of this utility model, the liquid crystal display screen 6 is an LCD display screen.

[0017] The embodiments described above are merely illustrative of the implementation of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low cost liquid crystal projector characterized by comprising: The application relates to a LED lamp module, an optical polarizer, a light funnel, an LCD light valve, a first Fresnel lens, a liquid crystal display screen, a second Fresnel lens, a reflector and a projection lens, wherein the LED lamp module and the projection lens are provided with an optical path, and the optical polarizer, the light funnel, the LCD light valve, the first Fresnel lens, the liquid crystal display screen, the second Fresnel lens and the reflector are sequentially and separately arranged along the length direction of the optical path.

2. A low cost liquid crystal projector according to claim 1, characterized in that The liquid crystal display screen is an LCD display screen.

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