Liquid Crystal Lens Projection Zoom Without Mechanical Focusing
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Solution Overview
Problem
Single LCD projectors face issues such as degradation of image quality after zooming, mechanical noise, high cost, and mechanical structure limitations, leading to suboptimal performance and increased costs.
Innovation Solution
A projection device utilizing a liquid crystal lens with adjustable focal length through applied voltages to liquid crystal molecules, combined with a reflecting mirror and lens assembly, to maintain image quality and reduce mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a liquid crystal lens is used to adjust focal length, then image quality is maintained during zooming, but device complexity increases due to voltage control requirements
Solution Approach 1:
The patent replaces mechanical focusing mechanisms with a liquid crystal lens that uses voltage-controlled refractive index changes to adjust focal length. This substitution eliminates mechanical moving parts while achieving precise focal adjustment, thereby maintaining image quality without significant increase in device complexity
Solution Approach 2:
The patent changes the physical parameter of the liquid crystal lens by applying voltages to alter the refractive index of liquid crystal molecules. This parameter change enables dynamic focal length adjustment without mechanical movement, resolving the contradiction between maintaining image quality and avoiding mechanical complexity
2Adaptability or versatility
If mechanical structures are used for zooming and focusing, then adjustment capability is achieved, but mechanical noise and reliability issues occur
Solution Approach 1:
The patent eliminates mechanical zooming and focusing mechanisms by using a liquid crystal lens that adjusts focal length through voltage control. This substitution removes mechanical noise and reliability issues associated with moving parts, while maintaining the capability to adjust projection distance and zoom levels
Solution Approach 2:
The patent implements dynamic focal length adjustment through voltage control of the liquid crystal lens, allowing real-time changes in projection distance and zoom without mechanical movement. This dynamic adjustment capability is achieved through electrical control rather than mechanical actuation, improving reliability
3Manufacturing precision
If three LCD screens are used, then projection quality is improved, but cost increases significantly
Solution Approach 1:
The patent uses a single LCD screen combined with a liquid crystal lens to achieve projection quality previously requiring three LCD screens. By dynamically changing the refractive index parameters of the liquid crystal lens, the system achieves superior projection performance from a single display component, significantly reducing cost
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution maintains image quality during zooming without mechanical adjustments, reduces noise, and lowers production costs by eliminating the need for complex mechanical structures.
Implementation Method 1
a liquid crystal lens disposed on a side of the display assembly away from the light source assembly, and a focal length of the projection device is adjusted through voltages applied to liquid crystal molecules in the liquid crystal lens
Implementation Method 2
a focal length of the projection device is adjusted through voltages applied to liquid crystal molecules in the liquid crystal lens
Implementation Method 3
light emitted from the light source assembly is projected to a non-display side of the display assembly
Data Source
AI summary
A projection device and method, a projector, a display system, and a picture adjustment device. The projection device comprises: a light source assembly; a display assembly arranged on the side of the light source assembly that emits light, the light emitted by the light source assembly being projected to the non-display side of the display assembly; and a liquid crystal lens arranged on the side of the display assembly away from the light source assembly, the focal length of the projection device being adjusted by the voltage applied to liquid crystal molecules in the liquid crystal lens.