LCD (Liquid Crystal Display) lens with compensation group and capable of keeping clear in whole focusing process
By setting an image quality compensation group within the LCD lens and utilizing micro-displacement adjustment, the problem of image quality degradation during focusing in existing LCD lenses is solved, achieving full-range sharpness maintenance. The structure is simple and the cost is low.
Patent Information
- Application Number
- CN202520065091.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing LCD lenses have a limited optimal imaging distance during focusing, resulting in image quality degradation at close or distant objects and an inability to maintain sharpness throughout the entire focusing process.
Design an LCD lens with a compensation group that maintains sharpness throughout the focusing process. By setting a lens group with an image quality compensation group inside the lens as a movable structure, the image quality can be adjusted by the micro-displacement of the lens group, ensuring sharpness at different projection distances and sizes.
It maintains image clarity during focusing, has a simple and low-cost structure, does not require additional optical components, and achieves clear imaging throughout the entire process.
Smart Images
Figure CN223624468U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to LCD lenses, specifically to an LCD lens with a compensation group that can maintain sharpness throughout the focusing process. Background Technology
[0002] LCD projector optical engines are gaining increasing market share due to their relatively high cost-performance ratio and continuously improving optical performance.
[0003] In existing technologies, the imaging section of an LCD projector consists of a single Fresnel lens and a multi-lens lens. The lens module can be a simple 3-lens design or a 7-lens design with off-axis or 4K resolution. The approach involves keeping the screen and Fresnel lens stationary, adjusting the focusing distance / size by changing the lens's back working distance to suit different projection scenarios. However, existing solutions have a drawback: the lens has only one optimal imaging distance, where the image quality is best at a specific distance. For example, if a lens has a focusing range of 40-150 inches, its optimal imaging size is 60 / 80 inches. Image quality gradually decreases at closer or farther distances, and the greater the difference from the optimal imaging size, the greater the image quality loss.
[0004] In order to ensure image clarity during focusing, it is necessary to improve existing LCD lenses. Utility Model Content
[0005] To address the shortcomings of existing technologies, the present invention aims to provide an LCD lens with a compensation group that maintains sharpness throughout the focusing process. The purpose of designing this LCD lens is to ensure image sharpness during focusing by using the micro-displacement of the image quality compensation group.
[0006] To solve the above technical problems, the present invention is achieved through the following solution: The present invention provides an LCD lens with a compensation group that can maintain clear focus throughout the entire focusing process, which includes, along the light emission direction, a lens module arranged sequentially in the lens housing, a Fresnel lens arranged at a distance from the lens module, and an LCD screen, wherein the lens module is movable through a focusing mechanism;
[0007] Along the light emission direction, the lens module includes a housing, and along the light emission direction, the lens module also includes a first lens group, a second lens group, and a third lens group disposed within the housing and spaced apart by a certain distance. Any one of the first lens group, the second lens group, and the third lens group serves as an image quality compensation group, and the lens group serving as the image quality compensation group is movable.
[0008] Furthermore, when the second lens group serves as the image quality compensation group, the sum of the first distance between the second lens group and the first lens group and the second distance between the image quality compensation group and the third lens group is constant.
[0009] Furthermore, when the second lens group is used as an image quality compensation group, the second lens group is a concave lens with two concave surfaces.
[0010] Furthermore, the first surface of the first lens group is a convex surface, and its second surface includes one of a convex surface, a flat surface, and a concave surface, with the first surface of the first lens group facing the projected image.
[0011] Furthermore, the first surface of the third lens group includes one of a convex surface, a flat surface, and a concave surface, and its second surface is a convex surface, with the second surface of the third lens group facing away from the projected image.
[0012] Furthermore, the driving structure of the second lens group satisfies the following condition: when the lens module moves toward the LCD screen, the second lens group is synchronously driven to move slightly toward the LCD screen.
[0013] The driving structure of the second lens group also satisfies the following condition: when the lens module moves away from the LCD screen, the second lens group is synchronously driven to move slightly away from the LCD screen.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. The LCD lens of this utility model sets one of its lens groups as an image quality compensation group and sets the lens group serving as the image quality compensation group as a movable structure to ensure image clarity during focusing.
[0016] 2. This utility model has a simple structure and low cost. It only requires structural support for small displacement of the image quality compensation group and does not require additional optical components. Attached Figure Description
[0017] Figure 1 A schematic diagram illustrating the working principle of the second lens group of this utility model when an image quality compensation group is set.
[0018] Figure 2 This is a schematic diagram showing the movement of the lens relative to the LCD screen and Fresnel lens when the projection distance or size is different.
[0019] Figure 3 This invention serves as an image quality compensation group when different projection distances or sizes are clustered together.
[0020] The attached diagram is labeled as follows: Lens module 1, Fresnel lens 2, LCD screen 3, first lens group 11, second lens group 12, and third lens group 13. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0023] Example 1: The specific structure of this utility model is as follows:
[0024] Please refer to the appendix. Figure 1-3 This utility model discloses an LCD lens with a compensation group that maintains clear focus throughout the focusing process. This LCD lens is based on an existing LCD lens, with an image quality compensation group internally configured as a movable structure. When one lens group is movable, the other two lens groups are fixed in position. Of course, the entire lens module 1 remains movable.
[0025] Specifically: the LCD lens, along the light emission direction, includes a lens module 1, a Fresnel lens 2 arranged sequentially in the lens housing, and an LCD screen 3, which are spaced apart from the lens module 1. The lens module 1 is movable by a focusing mechanism.
[0026] Along the light emission direction, the lens module 1 includes a housing. Along the light emission direction, the lens module 1 also includes a first lens group 11, a second lens group 12, and a third lens group 13 disposed within the housing and spaced apart by a certain distance. Any one of the first lens group 11, the second lens group 12, and the third lens group 13 serves as an image quality compensation group, and the lens group serving as the image quality compensation group is movable.
[0027] like Figure 1 As shown, Figure 1This is a schematic diagram illustrating the working principle of the second lens group of this invention when an image quality compensation group is set up. When the second lens group 12 serves as the image quality compensation group, the sum of the first distance between the second lens group 12 and the first lens group 11 and the second distance between the image quality compensation group and the third lens group 13 is constant. Let L1 be the distance between the first lens group 11 and the second lens group 12, and L2 be the distance between the second lens group 12 and the third lens group 13. Since the position of the second lens group 12 is variable, the values of L1 and L2 are variable, but the sum of L1 + L2 is a constant value.
[0028] like Figure 1-3 When the second lens group 12 is used as an image quality compensation group, the second lens group 12 is a concave lens with two concave surfaces; the first surface of the first lens group 11 is convex, and its second surface includes one of a convex surface, a flat surface, and a concave surface, with the first surface of the first lens group 11 facing the projected image. The first surface of the third lens group 13 includes one of a convex surface, a flat surface, and a concave surface, and its second surface is convex, with the second surface of the third lens group 13 facing away from the projected image.
[0029] The driving structure of the second lens group 12 satisfies the following condition: when the lens module 1 moves toward the LCD screen 3, the second lens group 12 is synchronously driven to move slightly toward the LCD screen 3.
[0030] The driving structure of the second lens group 12 also satisfies the following: when the lens module 1 moves away from the LCD screen 3, the second lens group 12 is synchronously driven to move slightly away from the LCD screen 3.
[0031] Through the functions of the image quality compensation group described above, ① when projecting a large image, the entire lens module 1 moves toward the LCD screen 3. Simultaneously, the second lens 12, which serves as the image quality compensation group, also makes a slight movement toward the LCD screen 3. Figure 2 The imaging principle ensures that the image quality of the large projected image remains clear during the focusing process of lens module 1. ② When projecting a small image, lens module 1 moves entirely away from the LCD screen 3, and the second lens 12, acting as the image quality compensation group, also moves slightly away from the LCD screen 3. Through this imaging principle, the image quality of the small projected image remains clear during the focusing process of lens module 1.
[0032] like Figure 3 As shown, Figure 3 This invention serves as an image quality compensation group when different projection distances or sizes are converged. The second lens 12 in the image quality compensation group emits a micro-displacement, i.e., from point A to point B, and the distance of this micro-displacement is less than 1 mm.
[0033] Example 2:
[0034] When the first lens group 11 or the third lens group 13 is used as the image quality compensation group, the positions of the other two lens groups remain unchanged. At this time, the distance between the position of the image quality compensation group and the adjacent lens group changes. It also moves slightly in sync with the direction of movement of the lens module 1 to ensure that the image is clear during the focusing process of the lens module 1.
[0035] In summary, this utility model's LCD lens incorporates one group of lenses as an image quality compensation group, and makes this lens group a movable structure to ensure image sharpness during focusing. This utility model has a simple structure and low cost, requiring only structural support for small displacements of the image quality compensation group without the need for additional optical components.
[0036] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.
Claims
1. An LCD lens with a compensation group that can maintain clarity throughout the focusing process, comprising, along the light emission direction, a lens module (1) arranged sequentially in the lens housing, a Fresnel lens (2) arranged at a distance from the lens module (1), and an LCD screen (3), wherein the lens module (1) is movable by a focusing mechanism; Along the light emission direction, the lens module (1) includes a housing, and along the light emission direction, the lens module (1) further includes a first lens group (11), a second lens group (12), and a third lens group (13) disposed within the housing and spaced apart by a certain distance. Its characteristic is that... Any one of the first lens group (11), the second lens group (12), and the third lens group (13) can be used as an image quality compensation group and the lens group used as the image quality compensation group can be moved.
2. The LCD lens with compensation group that maintains sharpness throughout the focusing process according to claim 1, characterized in that, When the second lens group (12) is used as an image quality compensation group, the sum of the first distance between the second lens group (12) and the first lens group (11) and the second distance between the image quality compensation group and the third lens group (13) is constant.
3. The LCD lens with compensation group that maintains sharpness throughout the focusing process according to claim 1, characterized in that, When the second lens group (12) is used as an image quality compensation group, the second lens group (12) is a concave lens with two concave surfaces.
4. An LCD lens with compensation group that maintains sharpness throughout the focusing process according to claim 3, characterized in that, The first surface of the first lens group (11) is a convex surface, and its second surface includes one of a convex surface, a plane, and a concave surface. The first surface of the first lens group (11) faces the projection screen.
5. An LCD lens with compensation group that maintains sharpness throughout the focusing process according to claim 3, characterized in that, The first surface of the third lens group (13) includes one of a convex surface, a flat surface, and a concave surface, and its second surface is a convex surface. The second surface of the third lens group (13) faces away from the projected image.
6. An LCD lens with compensation group that maintains sharpness throughout the focusing process according to claim 3, characterized in that, The driving structure of the second lens group (12) satisfies the following: when the lens module (1) moves toward the LCD screen (3), the second lens group (12) is synchronously driven to move slightly toward the LCD screen (3); The driving structure of the second lens group (12) also satisfies the following: when the lens module (1) moves away from the LCD screen (3), the second lens group (12) is synchronously driven to move slightly away from the LCD screen (3).