Monolithic LCD (liquid crystal display) projection short-focus lens
Through the combination of four spherical lenses and Fresnel lenses, the problem of short-focus lens design in single-chip LCD LCD projectors is solved, and the effect of high-definition 1080p image quality and high relative illumination is achieved. It is suitable for short-focus for large-size LCDs Lens application.
Patent Information
- Application Number
- CN202411586678.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2024-12-17
AI Technical Summary
Due to the large LCD size in single-chip LCD projectors, it is difficult to design a short-focus projection lens, which is difficult to meet the high-definition 1080p image quality requirements.
Using a global high-definition lens composed of four spherical lenses of different shapes and optical properties, combined with a Fresnel lens, the gradient focal length is 148mm, F/# is 3.0, and the projection ratio is 1.3. It is used for 5-inch LCD Projection makes up for the shortcomings in the application of short-focus lenses.
The distortion is less than 0.3%, the transmission is greater than 50% @ 11lp/mm, which meets the high-definition 1080p image quality requirements, and the relative illumination is greater than 75%. It is suitable for short-focus lens applications of large-size LCDs.
Smart Images
Figure CN119148342A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a projection lens (hereinafter referred to as lens) used in a liquid crystal (LCD, short for Liquid Crystal Display) projector. The liquid crystal projector is mainly composed of an illumination light path and an imaging device, and the LCD and the lens form an imaging component. The illumination light path is composed of a light emitting diode (LED) and other optical devices. Background Art
[0002] According to the display device classification, the current projectors are divided into 3LCD, LCOS, DLP, and single-chip LCD, and the through-type liquid crystal projectors are divided into 3LCD and single-chip LCD. At present, 3LCD liquid crystal projectors have long-focus projection lenses and short-focus projection lenses, and single-chip LCD liquid crystal projectors have a large LCD size, generally between 2.69 and 5.7 inches, so it is difficult to use short-focus projection lenses in the design of single-chip LCD projectors. The present invention invents and implements a short-focus lens on a 5-inch LCD, with a projection ratio of 1.3, a focal length of 148mm, F / #3.0, and a full-spherical lens combination. The Fresnel lens that participates in the imaging together has the characteristic of a gradual focal length, so that the distortion is less than 0.3%, the transfer function is greater than 50%@11lp / mm, and the high-definition 1080p image quality requirements are met, and the relative illumination is greater than 75%. Summary of the invention
[0003] The present invention is a spherical high-definition lens composed of four lenses of different shapes and different optical properties. It is a large-size LCD projection short-focus lens with a spherical solution. Its focal length is 148mm, F / # is 3.0, and the projection ratio is 1.3, which makes up for the lack of short-focus lens application in single-chip LCD projectors on the market.
[0004] The present invention is composed of four spherical lenses. Figure 1L1, L2, L3, and L4 shown in the figure refer to the four spherical lenses of the present invention from left to right. Lens L1 is a convex-concave spherical lens with positive refractive power, made of ZK11, with a lens diameter of 60.00 mm and a center thickness of 9.620 mm. Its spherical curvature radii are 71.818 mm and 371.689 mm respectively. In the present invention, the surface with a spherical curvature radius of 71.818 mm is on the left, and the other surface is on the right; Lens L2 is a double concave spherical lens with negative refractive power, made of ZF2, with a lens diameter of 44.76 mm and a center thickness of 1.199 mm. Its spherical curvature radii are 73.506 mm and 85.065 mm respectively. In the present invention, the surface with a spherical curvature radius of 73.506 mm is on the left, and the other surface is on the right; Lens L3 is a positive concave-convex spherical lens, made of ZK11, with a lens diameter of 48.80mm, a center thickness of 9.409mm, and spherical curvature radii of 107.771mm and 83.810mm, respectively. In the present invention, the surface with a spherical curvature radius of 107.771mm is on the left, and the other surface is on the right; Lens L4 is a positive double convex spherical lens, made of ZK11, with a lens diameter of 60.00mm, a center thickness of 10.545mm, and spherical curvature radii of 174.253mm and 71.658mm, respectively. In the present invention, the surface with a spherical curvature radius of 174.253mm is on the left, and the other surface is on the right. The intervals between the four spherical lenses of the present invention are as follows: 25.00mm between L1 and L2, 4.32mm between L2 and L3, and 0.20mm between L3 and L4. The total length of the four spherical lenses combined is 60.29 mm.
[0005] Four spherical lenses are fixed by plastic fasteners to form a whole, namely the present invention. Figure 1 As shown, the plastic fasteners for fixing the lenses fix the spherical lenses L1, L2, L3, and L4 in sequence from left to right according to the spacing distance requirements between them.
[0006] When the present invention is used, a 5-inch liquid crystal display panel with a resolution of 1920*1080 is required as the object surface of the projection lens to project an image through the present invention.
[0007] When the present invention is used, a Fresnel lens with a length and width of 120mm*70mm and a thickness of 1.60mm is also required. The Fresnel lens has the characteristic of gradual focal length. Figure 2 As shown, it is placed between the liquid crystal display panel and the four-piece spherical lens combination of the present invention, the distance between the Fresnel lens and the four-piece spherical lens combination is 121.66 mm, and the distance between the Fresnel lens and the liquid crystal display panel is 10.00 mm.
[0008] The spherical lens used in the composition of the present invention has low processing cost and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0010] Figure 1 It is a schematic diagram of the present invention. Four spherical lenses are fixed by plastic fasteners, and L1, L2, L3, and L4 are four spherical lenses. Figure 2 The figure shows the positional relationship between the four-piece spherical lens combination of the present invention and the liquid crystal display panel and the Fresnel lens when used. From left to right, they are: the four-piece spherical lens combination of the present invention, the Fresnel lens and the liquid crystal display panel. The interval between the Fresnel lens and the four-piece spherical lens combination is 121.66 mm, and the interval between the Fresnel lens and the liquid crystal display panel is 10.00 mm. DETAILED DESCRIPTION
[0011] The present invention comprises four spherical lenses ( Figure 1 It is composed of L1, L2, L3, L4) and is made of plastic fasteners. Figure 1 As shown, L1, L2, L3, and L4 are fixed from left to right in sequence, with the surface of L1 having a spherical curvature radius of 71.818 mm on the left and the other surface on the right, the surface of L2 having a spherical curvature radius of 73.506 mm on the left and the other surface on the right, the surface of L3 having a spherical curvature radius of 107.771 mm on the left and the other surface on the right, and the surface of L4 having a spherical curvature radius of 174.253 mm on the left and the other surface on the right. When the present invention is used, the four spherical lenses are combined and placed on the left side of the liquid crystal display panel, and a Fresnel lens is placed between the present invention and the liquid crystal display panel. The Fresnel lens has a specification of 120 mm*70 mm, a thickness of 1.60 mm, and a focal length of a gradual focal length. The Fresnel lens is spaced 121.66 mm from the present invention, and the Fresnel lens is spaced 10.00 mm from the liquid crystal display panel.
Claims
1. A single-chip LCD projection short-focus lens, characterized in that: A combination of four spherical lenses is used, and the total length of the combination is 60.29mm.
2. According to the spherical lens assembly of claim 1, the feature of lens 1 is that it is a convex-concave spherical lens with positive refractive power, made of ZK11, with a lens diameter of 60.00 mm, a center thickness of 9.620 mm, and spherical curvature radii of 71.818 mm and 371.689 mm respectively.
3. According to the spherical lens assembly of claim 1, the lens 2 is characterized in that it is a double concave spherical lens with negative refractive power, made of ZF2, with a lens diameter of 44.76 mm, a center thickness of 1.199 mm, and a spherical curvature radius of 73.506 mm and 85.065 mm respectively.
4. According to the spherical lens assembly of claim 1, the lens 3 is characterized in that it is a concave-convex spherical lens with positive refractive power, made of ZK11, with a lens diameter of 48.80 mm, a center thickness of 9.409 mm, and a spherical curvature radius of 107.771 mm and 83.810 mm respectively.
5. The spherical lens assembly according to claim 1, wherein lens 4 is a biconvex spherical lens with positive refractive power, made of ZK11, with a lens diameter of 60.00 mm, a center thickness of 10.545 mm, and spherical curvature radii of 174.253 mm and 71.658 mm, respectively.
6. The spherical lens assembly according to claim 1, wherein the intervals between the four spherical lenses are: 25.00 mm between lens 1 and lens 2, 4.32 mm between lens 2 and lens 3, and 0.20 mm between lens 3 and lens 4.