Slim Projection Display Using Collimating and Diffusion Layers
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Solution Overview
Problem
Microdisplay-based projection display systems have thicker system cabinets compared to flat-panel display systems, which can be a drawback for consumers, and existing methods to reduce cabinet depth, such as using fold mirrors, are limited in effectiveness and cost-efficient solutions.
Innovation Solution
The implementation of a display system with a collimating layer and a diffusion layer in the light path, utilizing multiple refractive lenses with smaller maximum angles of incidence instead of expensive Fresnel lenses, to reduce system cabinet depth while increasing the viewing angle and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If Fresnel lenses with high maximum angle of incidence are used to reduce system cabinet depth, then the cabinet depth is reduced, but the system cost increases significantly
Solution Approach 1:
The patent divides the single high-angle Fresnel lens into multiple standard Fresnel lenses with lower maximum angles of incidence arranged in sequence. This segmentation allows each lens to operate within its optimal angle range while collectively achieving the same light redirection function, reducing system cost without compromising cabinet depth reduction
Solution Approach 2:
The patent combines multiple standard Fresnel lenses with lower maximum angles of incidence to achieve the cumulative light redirection effect of a single high-angle Fresnel lens. This merging approach maintains the optical functionality while using more cost-effective, readily available lens components
2Length of stationary object
If the system cabinet depth is reduced using conventional methods, then the cabinet becomes thinner, but the viewing angle decreases
Solution Approach 1:
The patent arranges multiple Fresnel lenses in a sequential optical path configuration that redirects light through multiple stages. This multi-dimensional light path management maintains sufficient viewing angle by preserving light distribution characteristics while achieving reduced cabinet depth through optimized optical geometry
3Ease of manufacture
If standard Fresnel lenses with smaller maximum angles of incidence are used instead of high-angle Fresnel lenses, then the system cost is reduced, but more lenses are required increasing system complexity
Solution Approach 1:
The optical system is segmented into multiple stages, each handled by a standard Fresnel lens with lower maximum angle of incidence. This segmentation distributes the optical function across multiple simpler components, making each lens easier to manufacture and obtain while maintaining overall system functionality
Solution Approach 2:
The patent uses multiple instances of the same standard Fresnel lens design, making each lens universal and interchangeable. This universality simplifies manufacturing and inventory management compared to requiring a single custom high-angle lens, as standard lenses are more readily available and cost-effective
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
This approach allows for the construction of microdisplay-based projection display systems with a slim cabinet depth without using high-cost Fresnel lenses, reducing overall system costs and enabling the creation of thin display systems while maintaining image quality and viewing angle.
Implementation Method 1
The collimating layer includes a first lens having first and second axes orthogonal to each other and to a light path of the display plane, wherein the first lens, along its first axis, redirects light towards the light path of the display plane, and a second lens positioned in the light path after the first lens, the second lens having first and second axes orthogonal to each other and to the light path of the display plane, wherein the second lens, along its first and second axes, redirects light towards the light path of the display plane so that the light is substantially parallel to the light path of the display plane.
Implementation Method 2
a diffusion layer positioned in the light path of the display plane after the collimating layer. The diffusion layer increases a viewing angle of the display plane.
Data Source
AI summary
System and method for projection display with slim cabinet depth. An embodiment comprises a collimating layer positioned in a light path of a display plane, and a diffusion layer positioned in the light path of the display plane after the collimating layer. The diffusion layer increases the viewing angle of the display plane. The collimating layer comprises a first lens having first and second axes orthogonal to each other and to the light path and a second lens positioned in the light path after the first lens, the second lens having first and second axes orthogonal to each other and to the light path. The first lens is configured along its first axis to redirect light towards the light path and the second lens is configured along its first and second axes to redirect light towards the light path so that the light is substantially parallel to the light path.