Projection Display Device Using High Refractive Index Lens
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Solution Overview
Problem
Existing projection display devices are limited by their size and require multiple optical elements for collimated light generation, which hinders miniaturization and increases manufacturing costs.
Innovation Solution
A projection display device design that uses a single condensing lens with a higher refractive index to convert light into both condensed and collimated light, eliminating the need for a separate collimating lens, and incorporates dichroic mirrors for color synthesis, reducing the overall size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple optical elements are used for collimated light generation, then light collimation is achieved, but device size increases and manufacturing cost increases
Solution Approach 1:
The patent combines the condensing lens and collimating lens into a single lens structure. The single lens has a first surface with a first curvature and a second surface with a second curvature, where the curvatures are different, allowing it to perform both light condensing and collimation functions simultaneously. This merging eliminates the need for multiple separate optical elements, thereby reducing device size and manufacturing cost while maintaining light collimation functionality.
Solution Approach 2:
The single lens in the patent is designed to serve multiple functions: it acts as both a condensing lens and a collimating lens. By carefully designing the curvatures of its two surfaces, the lens can concentrate light from the light source while simultaneously producing collimated light output. This multi-functionality reduces the overall number of optical components needed in the projection display device.
2Reliability
If multiple optical elements are used for collimated light generation, then light collimation is achieved, but device size increases
Solution Approach 1:
The patent merges the condensing lens and collimating lens into a single integrated lens component. This single lens has a specific dual-curved structure that enables it to perform both light condensing and collimation functions that would traditionally require two separate lenses. By combining these functions into one element, the overall device volume is significantly reduced while maintaining the necessary light collimation for projection.
3Reliability
If multiple optical elements are used for collimated light generation, then light collimation is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines two separate optical elements (condensing lens and collimating lens) into a single lens component. This reduces the number of parts that need to be manufactured, assembled, and aligned. Fewer optical elements mean lower material costs, reduced assembly complexity, and fewer potential points of failure, thereby decreasing overall manufacturing cost while maintaining light collimation performance.
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 effectively miniaturizes the projection display device while maintaining high picture quality by integrating light condensing and collimation functions into a single lens, reducing the number of optical elements and manufacturing costs.
Implementation Method 1
a first lens including a light incidence surface having a curvature smaller than a curvature of a light outgoing surface of the first lens, the first lens configured to convert the light received from the light source into a condensed light
Implementation Method 2
a second lens configured to receive the light from the first lens, and to convert the received light into a collimated light, the second lens having a refractive index lower than a refractive index of the first lens
Data Source
AI summary
A projection display device is discussed, which can include a condensing lens having a refractive index higher than that of a collimating lens, thereby being capable of miniaturizing not only the collimating lens, but also lenses arranged downstream from the condensing lens.