Offset Phosphor Color Foil for Universal Projection Displays
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Solution Overview
Problem
Current phosphor color foils are not universally applicable across various projection display devices due to differences in light source brightness, requiring dedicated foils for each device, leading to high manufacturing costs and inefficiencies in producing multiple device variants.
Innovation Solution
A phosphor color foil with a substrate that rotates and has phosphor applied in an annular pattern offset from the substrate's rotational center, allowing the excitation light locus to cover both inside and outside the applied region, enabling adjustable emission times for each color to maintain balanced light distribution across different devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dedicated phosphor color foil is designed for each projection display device model, then the light distribution can be optimized for that specific device, but the manufacturing cost increases and production efficiency decreases
Solution Approach 1:
The phosphor color foil is designed with a universal structure that can be used across multiple projection display device models. The key innovation is making the phosphor applied region extend beyond the light source mounting surface, allowing the same foil design to accommodate different light source positions and sizes while maintaining optimal light distribution for each device type.
Solution Approach 2:
The patent introduces a dynamic design approach where the phosphor applied region is intentionally made larger than the light source mounting surface. This creates a flexible system that can adapt to different device configurations without requiring dedicated foils for each model, thus improving production efficiency while maintaining light distribution optimization.
2Device complexity
If the phosphor applied region is limited to the light source mounting surface, then the foil design is simplified, but it cannot be universally applied across different device models
Solution Approach 1:
By extending the phosphor applied region beyond the light source mounting surface, the foil achieves universal applicability across multiple device models. The extended region allows the same foil to work with different light source positions and configurations, making the design versatile without significantly increasing complexity.
Solution Approach 2:
The phosphor applied region is segmented into different zones: a first region corresponding to the light source mounting surface and a second region extending beyond it. This segmentation allows the foil to serve multiple functions - providing precise light distribution at the mounting surface while also enabling universal adaptation to different device models through the extended region.
3Reliability
If multiple dedicated phosphor color foils are produced for different device models, then each device gets optimized performance, but the manufacturing cost increases
Solution Approach 1:
The patent creates a universal phosphor color foil design that can be used across multiple projection display device models. By extending the phosphor applied region beyond the light source mounting surface, the same foil design achieves optimized light distribution for different devices without requiring separate dedicated foils, thereby reducing manufacturing costs while maintaining 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
This solution allows a single phosphor color foil to be used across multiple projection display devices with varying light sources, reducing manufacturing costs and enabling quick adaptation to different device models without the need for multiple dedicated foils.
Implementation Method 1
a phosphor color foil for emitting, from a phosphor, light having a wavelength different from that of excitation light emitted from a light source
Data Source
AI summary
Phosphor color foil 1 comprises glass substrate 2, rotary motor 3 for rotating glass substrate 2, and phosphor (first phosphor) 5 annularly applied on the surface of glass substrate 2. The center of the applied region of phosphor 5 is different from the rotational center of glass substrate 2. The center of one or both of outer boundary line 5a and inner boundary line 5b of the applied region of phosphor 5 is different from the rotational center of glass substrate 2. Center axis 6 of glass substrate 2 is separated from the rotational center. Another phosphor (second phosphor) 9 is annularly applied adjacently to and inside or outside the applied region of phosphor 5.