LCD (liquid crystal display) imaging device with small projection ratio

Abstract

The invention discloses a small-projection-ratio LCD imaging device. The small-projection-ratio LCD imaging device comprises an LCD light valve, a Fresnel lens and a lens which are sequentially arranged in the light advancing direction. The size range of the LCD light valve is 2.6-3 inches, and the resolution ratio is FHD. And the tooth surface of the Fresnel lens faces the LCD light valve. The lens comprises a fifth lens, a fourth lens, a third lens, a second lens and a first lens which are sequentially arranged in the light advancing direction. The invention has the advantages of simple structure, productization, moderate cost, higher design core index and the like, solves the new demands of part of consumers, actively explores industry research and development and development of small-projection-ratio product markets, and actively promotes the industry to develop forward.

Description

Technical Field

[0001] The invention relates to the technical field of projectors, and in particular to a small-throw ratio LCD imaging device. Background Art

[0002] In the more than 30 years of the "single LCD projector" history, the projection ratio of a specific product (usually people use "lens projection ratio" to describe it, which is very imprecise, but in view of the actual communication and exchange situation agreed upon in the industry, this invention does not make a distinction, the same below) has not yet been ≤1. This indicator information is easy to draw objective conclusions on platforms such as JD.com, Tmall, Douyin and Amazon. In the past, a relatively large projection range such as 1.2-2.4 did not cause customer complaints, but today's young generation of consumers have a firm demand for projecting a larger picture in a smaller room, so designing and manufacturing projectors with a smaller projection, such as 0.7-0.9, has become a priority issue that needs to be solved.

[0003] Single LCD projector has a large LCD light valve size. Currently, the mainstream size of LCD light valve is 2.6 inches (object surface φ66mm) - 5 inches (object surface Φ127mm). To achieve a projection ratio ≤ 1, it is extremely difficult to design and manufacture under the premise of cost priority and industry-friendly lens aperture (F# or Fno, not distinguished) ≤ 2.8.

[0004] The purpose of the present invention is to develop a small projection ratio imaging device for market launch in combination with the urgent needs of current consumers and the actual situation of the supply chain (such as optical cold processing). The projection ratio of the device is about 0.85 (for 2.6-inch light valve) → about 0.73 (for 3-inch light valve). It has the advantages of simple structure, productization, moderate cost, and high core design indicators. It solves the new demands of some consumers, actively explores the industry's research and development and development of the small projection ratio product market, and actively promotes the development of the industry. Summary of the invention

[0005] The present invention provides a small projection ratio LCD imaging device, whose projection ratio is about 0.85 (for 2.6-inch light valve) → about 0.73 (for 3-inch light valve), and has the significant advantages of simple structure, productization, moderate cost, and high core design indicators. It solves the new demands of some consumers, actively explores the industry's research and development and development of the small projection ratio product market, and actively promotes the development of the industry.

[0006] The specific technical solution adopted by the present invention is as follows:

[0007] A small-throw ratio LCD imaging device comprises an LCD light valve, a Fresnel lens and a lens arranged in sequence according to the direction of light travel;

[0008] The size of the LCD light valve ranges from 2.6 inches to 3 inches, and the resolution is FHD;

[0009] The tooth surface of the Fresnel lens faces the LCD light valve; the focal length of the Fresnel lens is 60±2.5 mm; the air distance between the vertex of the tooth surface of the Fresnel lens and the LCD light valve is 10±0.5 mm; the thickness of the Fresnel lens is 1.9±0.2 mm, and the material is PMMA;

[0010] The lens comprises a fifth lens, a fourth lens, a third lens, a second lens and a first lens which are arranged in sequence according to the direction of light travel;

[0011] The first lens is a concave-convex lens, made of Chinese brand H-ZF1A or its international replacement brand, with a concave radius of R18.21±0.02mm, a convex radius of R32.35±0.03mm, a center thickness of 5.36±0.08mm, an outer diameter of ≥Φ35.9mm, and a concave surface as an incident surface;

[0012] The second lens is a concave-convex lens, made of Chinese brand H-ZLAF4LA or its international replacement brand, with a concave radius of R130±0.05mm, a convex radius of R22.01±0.03mm, a center thickness of 7.74±0.1mm, an outer diameter of ≥Φ27.5mm, and a concave surface as the incident surface;

[0013] The third lens is a concave-convex lens, made of Chinese brand H-ZF4A or its international replacement brand, with a concave radius of R23.21±0.03mm, a convex radius of R60.25±0.03mm, a center thickness of 1.5±0.05mm, an outer diameter of the lens of ≥Φ21mm, and a concave surface as the incident surface;

[0014] The fourth lens is a concave-convex lens, made of Chinese brand H-ZLAF50E or its international replacement brand, with a concave radius of R103.05±0.03mm, a convex radius of 20.14mm, a center thickness of 9±0.1mm, an outer diameter of the lens of ≥Φ30.4mm, and a convex surface as the incident surface;

[0015] The fifth lens is a concave-convex lens, made of Chinese brand H-ZF52 or its international replacement brand, with a concave radius of R20.14 mm, a convex radius of R32.94±0.03, a center thickness of 2.55±0.05, an outer diameter of ≥Φ35 mm, and a convex surface as an incident surface;

[0016] The convex surface of the fourth lens and the concave surface of the fifth lens are glued together;

[0017] The air distance between the vertex of the incident surface of the first lens and the vertex of the exit surface of the second lens is 1.6±0.05mm; the air distance between the vertex of the incident surface of the second lens and the vertex of the exit surface of the third lens is 0.2±0.05mm; the air distance between the vertex of the incident surface of the third lens and the vertex of the exit surface of the fourth lens is 13.25±0.05mm;

[0018] The air distance between the vertex of the incident surface of the fifth lens and the vertex of the tooth surface of the Fresnel lens is between 33.5 mm and 37.5 mm, and the image focusing of the small projection ratio LCD imaging device is achieved by moving the lens within the range of 33.5 mm to 37.5 mm.

[0019] Beneficial effects of the invention: The present invention has developed this small projection ratio LCD imaging device in combination with the urgent needs of current consumers and the actual situation of the supply chain (such as optical cold processing). The projection ratio of the device is about 0.85 (for 2.6-inch light valve) → about 0.73 (for 3-inch light valve). It has the significant advantages of simple structure, productization, moderate cost, and high core design indicators. It solves the new demands of some consumers, actively explores the industry's research and development and development of the small projection ratio product market, and actively promotes the development of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0022] The above reference numerals:

[0023] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Fresnel lens; 7. LCD light valve. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0025] It should be noted that similar reference numerals denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

[0026] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example:

[0030] like Figure 1 As shown, a small projection ratio LCD imaging device provided in this embodiment includes an LCD light valve 7, a Fresnel lens 6 and a lens arranged in sequence according to the direction of light travel; the size of the LCD light valve 7 ranges from 2.6 inches to 3 inches, and the resolution is FHD.

[0031] In the summer of 2024, CSOT mass-produced a 3-inch LCD light valve with a resolution of FHD, and in the winter of 2024, BOE's 2.69-inch LCD light valve with a resolution of FHD will be launched on the market. The small projection ratio LCD imaging device provided in this embodiment is developed and innovated to adapt to the latest situation of the above-mentioned supply chain and based on the latest demands of some consumers in recent years.

[0032] The tooth surface of the Fresnel lens 6 faces the LCD light valve 7; the focal length of the Fresnel lens 6 is 60±2.5 mm; the air distance between the vertex of the tooth surface of the Fresnel lens 6 and the LCD light valve 7 is 10±0.5 mm; the thickness of the Fresnel lens 6 is 1.9±0.2 mm, and the material is PMMA.

[0033] The lens comprises a fifth lens 5, a fourth lens 4, a third lens 3, a second lens 2 and a first lens 1 which are arranged in sequence according to the direction of light travel.

[0034] The first lens 1 is a concave-convex lens, the material is Chinese brand H-ZF1A or its international replacement brand, the radius of the concave surface is R18.21±0.02mm, the radius of the convex surface is R32.35±0.03mm, the center thickness is 5.36±0.08mm, the outer diameter of the lens is ≥Φ35.9mm, and the concave surface is the incident surface.

[0035] The second lens 2 is a concave-convex lens, made of Chinese brand H-ZLAF4LA or its international replacement brand, with a concave radius of R130±0.05mm, a convex radius of R22.01±0.03mm, a center thickness of 7.74±0.1mm, an outer diameter of the lens of ≥Φ27.5mm, and a concave surface as the incident surface.

[0036] The third lens 3 is a meniscus lens, made of Chinese brand H-ZF4A or its international replacement brand, with a radius of R23.21±0.03mm on the concave surface, a radius of R60.25±0.03mm on the convex surface, a center thickness of 1.5±0.05mm, an outer diameter of ≥Φ21mm, and a concave surface as the incident surface.

[0037] The fourth lens 4 is a concave-convex lens, made of Chinese brand H-ZLAF50E or its international replacement brand, with a radius of R103.05±0.03mm, a radius of convex surface of 20.14mm, a center thickness of 9±0.1mm, an outer diameter of the lens of ≥Φ30.4mm, and a convex surface as the incident surface.

[0038] The fifth lens 5 is a meniscus lens, made of Chinese brand H-ZF52 or its international replacement brand, with a concave radius of R20.14 mm, a convex radius of R32.94±0.03, a center thickness of 2.55±0.05, an outer diameter of the lens ≥Φ35 mm, and a convex surface as the incident surface.

[0039] The convex surface of the fourth lens 4 and the concave surface of the fifth lens 5 are glued together.

[0040] The air distance between the incident surface vertex of the first lens 1 and the exit surface vertex of the second lens 2 is 1.6±0.05mm; the air distance between the incident surface vertex of the second lens 2 and the exit surface vertex of the third lens 3 is 0.2±0.05mm; the air distance between the incident surface vertex of the third lens 3 and the exit surface vertex of the fourth lens 4 is 13.25±0.05mm; the air distance between the incident surface vertex of the fifth lens 5 and the vertex of the tooth surface of the Fresnel lens 6 is between 33.5mm-37.5mm, and the image focusing of the small projection ratio LCD imaging device is achieved by moving the lens within the range of 33.5mm-37.5mm.

[0041] This embodiment has developed this small projection ratio LCD imaging device in combination with the urgent needs of current consumers and the actual situation of the supply chain (such as optical cold processing). Its projection ratio is about 0.85 (for 2.6-inch light valve) → about 0.73 (for 3-inch light valve). It has the significant advantages of simple structure, productization, moderate cost, and high core design indicators. It solves the new demands of some consumers, actively explores the industry's research and development and development of the small projection ratio product market, and actively promotes the development of the industry.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A small projection ratio LCD imaging device, characterized in that: It comprises an LCD light valve (7), a Fresnel lens (6) and a lens which are arranged in sequence according to the direction of light travel; The size of the LCD light valve (7) ranges from 2.6 inches to 3 inches, and the resolution is FHD; The tooth surface of the Fresnel lens (6) faces the LCD light valve (7); the focal length of the Fresnel lens (6) is 60±2.5 mm; the air distance between the vertex of the tooth surface of the Fresnel lens (6) and the LCD light valve (7) is 10±0.5 mm; the thickness of the Fresnel lens (6) is 1.9±0.2 mm, and the material is PMMA; The lens comprises a fifth lens (5), a fourth lens (4), a third lens (3), a second lens (2) and a first lens (1) which are arranged in sequence according to the direction of travel of light; The first lens (1) is a concave-convex lens, made of Chinese brand H-ZF1A or its international replacement brand, with a concave radius of R18.21±0.02mm, a convex radius of R32.35±0.03mm, a center thickness of 5.36±0.08mm, an outer diameter of ≥Φ35.9mm, and the concave surface being the incident surface; The second lens (2) is a concave-convex lens, made of Chinese brand H-ZLAF4LA or its international replacement brand, with a concave radius of R130±0.05mm, a convex radius of R22.01±0.03mm, a center thickness of 7.74±0.1mm, an outer diameter of ≥Φ27.5mm, and a concave surface as an incident surface; The third lens (3) is a concave-convex lens, made of Chinese brand H-ZF4A or its international substitute brand, with a concave radius of R23.21±0.03mm, a convex radius of R60.25±0.03mm, a center thickness of 1.5±0.05mm, an outer diameter of the lens of ≥Φ21mm, and the concave surface being the incident surface; The fourth lens (4) is a concave-convex lens, made of Chinese brand H-ZLAF50E or its international replacement brand, with a concave radius of R103.05±0.03mm, a convex radius of 20.14mm, a center thickness of 9±0.1mm, an outer diameter of the lens of ≥Φ30.4mm, and the convex surface being the incident surface; The fifth lens (5) is a concave-convex lens, made of Chinese brand H-ZF52 or its international replacement brand, with a concave radius of R20.14 mm, a convex radius of R32.94±0.03, a center thickness of 2.55±0.05, an outer diameter of ≥Φ35 mm, and a convex surface as an incident surface; The convex surface of the fourth lens (4) and the concave surface of the fifth lens (5) are glued together; The air distance between the vertex of the incident surface of the first lens (1) and the vertex of the exit surface of the second lens (2) is 1.6±0.05 mm; The air distance between the vertex of the incident surface of the second lens (2) and the vertex of the exit surface of the third lens (3) is 0.2±0.05 mm; The air distance between the vertex of the incident surface of the third lens (3) and the vertex of the exit surface of the fourth lens (4) is 13.25±0.05 mm; The air distance between the vertex of the incident surface of the fifth lens (5) and the vertex of the tooth surface of the Fresnel lens (6) is between 33.5 mm and 37.5 mm, and the image focusing of the small-throw ratio LCD imaging device is achieved by moving the lens within the range of 33.5 mm to 37.5 mm.

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