Monolithic LCD (liquid crystal display) projection short-focus lens
By designing a global short-throw lens that combines four spherical lenses with a graduated focal length Fresnel lens, the problem of high-definition imaging of large-size LCDs in single-chip LCD projectors was solved, achieving high-resolution and low-distortion projection effects.
Patent Information
- Application Number
- CN202422717629.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-08
AI Technical Summary
In single-chip LCD projectors, short-throw lens designs make it difficult to achieve high-definition image quality, especially on large-size LCDs. Existing technologies cannot meet the requirements of distortion less than 0.3% and transfer function greater than 50%@11lp/mm.
A global high-definition short-throw lens with a focal length of 148mm, an f/# of 3.0, and a throw ratio of 1.3 was designed by combining four spherical lenses of different shapes and optical properties with a Fresnel lens with a graduated focal length. This lens is intended for use in a 5-inch LCD projector.
It achieves distortion of less than 0.3%, transfer function of greater than 50%@11lp/mm, high-definition 1080p image quality, and relative illumination of greater than 75%, meeting the high resolution requirements of single-chip LCD projectors.
Smart Images
Figure CN223664839U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the projection objective lens (hereinafter referred to as the lens) used for liquid crystal (LCD, the abbreviation of Liquid Crystal Display) projector. The liquid crystal projector is mainly composed of the illumination light path and imaging device, and the LCD and the lens form the imaging assembly. The illumination light path adopts light emitting diode (LED) and other optical devices. BACKGROUND
[0002] According to the display device classification, the current projector is divided into 3LCD, LCOS, DLP and single-chip LCD, and the through type liquid crystal projector is divided into 3LCD and single-chip LCD. At present, the 3LCD liquid crystal projector has long-focus projection lens and short-focus projection lens, and the single-chip LCD liquid crystal projector is generally between 2.69~5.7 inches due to the larger LCD size, so it is difficult to use the short-focus projection lens in the design of the single-chip LCD projector. The utility model discloses the short-focus lens on the 5-inch LCD, and the projection ratio is 1.3, the focal length is 148mm, F / # is 3.0, the global surface lens combination is adopted, the Fresnel lens participating in imaging together has the characteristics of gradually changing focal length, so that the distortion is less than 0.3%, the transmission function is greater than 50% at 11lp / mm, the high-definition 1080p image quality requirement is reached, and the relative luminance is greater than 75%. SUMMARY
[0003] The utility model discloses a kind of global surface high-definition lenses combined by four different shapes, different optical properties lenses, it is a global surface scheme large size LCD projection short-focus lens, the focal length is 148mm, F / # is 3.0, projection ratio is 1.3, make up the shortage of short-focus lens application in single-chip LCD liquid crystal projector on market.
[0004] The utility model discloses four spherical lenses, according to Figure 1The first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are four spherical lenses of the utility model from left to right respectively. The first lens L1 is a convex-concave spherical lens with positive diopter, the material is ZK11, the lens aperture is 60.00mm, the center thickness is 9.620mm, the spherical radii of curvature are 71.818mm and 371.689mm respectively, in the utility model, the face with the spherical radius of curvature of 71.818mm is on the left, and the other face is on the right; the second lens L2 is a double-concave spherical lens with negative diopter, the material is ZF2, the lens aperture is 44.76mm, the center thickness is 1.199mm, the spherical radii of curvature are 73.506mm and 85.065mm respectively, in the utility model, the face with the spherical radius of curvature of 73.506mm is on the left, and the other face is on the right; the third lens L3 is a concave-convex spherical lens with positive diopter, the material is ZK11, the lens aperture is 48.80mm, the center thickness is 9.409mm, the spherical radii of curvature are 107.771mm and 83.810mm respectively, in the utility model, the face with the spherical radius of curvature of 107.771mm is on the left, and the other face is on the right; the fourth lens L4 is a double-convex spherical lens with positive diopter, the material is ZK11, the lens aperture is 60.00mm, the center thickness is 10.545mm, the spherical radii of curvature are 174.253mm and 71.658mm respectively, in the utility model, the face with the spherical radius of curvature of 174.253mm is on the left, and the other face is on the right. The intervals between the four spherical lenses are as follows: the interval between the first lens L1 and the second lens L2 is 25.00mm, the interval between the second lens L2 and the third lens L3 is 4.32mm, and the interval between the third lens L3 and the fourth lens L4 is 0.20mm. The total length of the four spherical lens combination is 60.29mm.
[0005] The four spherical lenses are fixed by plastic fasteners to form an integral whole, namely the utility model. Figure 1 As shown, the plastic fasteners for fixing the lenses fix the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 of the spherical lenses from left to right according to the interval distance requirements therebetween.
[0006] In use, a 5-inch liquid crystal display panel with a resolution of 1920*1080 is needed as the object plane of the projection lens, and is projected and imaged by the utility model.
[0007] In use, a Fresnel lens with a length of 120mm, a width of 70mm and a thickness of 1.60mm is also needed, the Fresnel lens has the characteristics of variable focal length, and is arranged Figure 2As shown, it is placed between the liquid crystal display panel and the four spherical lens assembly of this utility model. The Fresnel lens is 121.66mm away from the four spherical lens assembly, and the Fresnel lens is 10.00mm away from the liquid crystal display panel.
[0008] The spherical lens used in this invention has low processing cost and is suitable for mass production. Attached Figure Description
[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0010] Figure 1 This is a schematic diagram of the present invention. The four spherical lenses are fixed by plastic fasteners. The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are four spherical lenses. Figure 2 This diagram illustrates the positional relationship between the four spherical lens assembly of this invention, the liquid crystal display panel, and the Fresnel lens during specific use. From left to right: the four spherical lens assembly of this invention, the Fresnel lens, and the liquid crystal display panel. The Fresnel lens is spaced 121.66 mm from the four spherical lens assembly, and 10.00 mm from the liquid crystal display panel. Detailed Implementation
[0011] This utility model consists of four spherical lenses ( Figure 1 The lens consists of, in order, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, and is secured with plastic fasteners. Figure 1 As shown, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are fixed sequentially from left to right. The first lens L1 has its spherical surface with a radius of curvature of 71.818 mm on the left and the other side on the right. The second lens L2 has its spherical surface with a radius of curvature of 73.506 mm on the left and the other side on the right. The third lens L3 has its spherical surface with a radius of curvature of 107.771 mm on the left and the other side on the right. The fourth lens L4 has its spherical surface with a radius of curvature of 174.253 mm on the left and the other side on the right. In use, the four spherical lenses are arranged together and placed on the left side of the LCD panel. A Fresnel lens, measuring 120 mm * 70 mm and 1.60 mm thick, is placed between the LCD panel and the LCD panel. The Fresnel lens has a graduated focal length. The distance between the Fresnel lens and the LCD panel is 121.66 mm, and the distance between the Fresnel lens and the LCD panel is 10.00 mm.
Claims
1. A monolithic LCD projection short focal length lens characterized by: The four global surface lens combinations have a total length of 60.29mm; The structure comprises, along the optical axis from the projection surface to the image source surface, a first lens (L1) with positive refractive power, a second lens (L2) with negative refractive power, a third lens (L3) with positive refractive power, and a fourth lens (L4) with positive refractive power; wherein the first lens (L1) is a convex-concave spherical lens, the material is ZK11, the lens aperture is 60.00mm, the center thickness is 9.620mm, and the spherical curvature radii are 71.818mm and 371.689mm respectively; the second lens (L2) is a double-concave spherical lens, the material is ZF2, the lens aperture is 44.76mm, the center thickness is 1.199mm, and the spherical curvature radii are 73.506mm and 85.065mm respectively; the third lens (L3) is a concave-convex spherical lens, the material is ZK11, the lens aperture is 48.80mm, the center thickness is 9.409mm, and the spherical curvature radii are 107.771mm and 83.810mm respectively; the fourth lens (L4) is a double-convex spherical lens, the material is ZK11, the lens aperture is 60.00mm, the center thickness is 10.545mm, and the spherical curvature radii are 174.253mm and 71.658mm respectively; the interval between the four spherical lenses is 25.00mm between the first lens (L1) and the second lens (L2), 4.32mm between the second lens (L2) and the third lens (L3), and 0.20mm between the third lens (L3) and the fourth lens (L4); meanwhile, the four global surface lens combinations need a 5-inch liquid crystal display panel with a resolution of 1920*1080; a Fresnel lens with a length of 120mm, a width of 70mm, and a thickness of 1.60mm is also needed, the Fresnel lens has the characteristics of gradually changing focal length, and is placed between the liquid crystal display panel and the four spherical lens combinations, ensuring that the interval between the Fresnel lens and the four spherical lens combinations is 121.66mm, and the interval between the Fresnel lens and the liquid crystal display panel is 10.00mm.