Light Uniformizing Element with Internal Splitting Surface
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Solution Overview
Problem
Current projection apparatuses face challenges in achieving symmetric blue light incidence onto light uniformizing elements, leading to poor color uniformity and increased costs due to additional optical elements and mechanical parts required to compensate for asymmetrical incidence.
Innovation Solution
A light uniformizing element with a light splitting surface inside the element, where the normal vector of the splitting surface is perpendicular to the central axis, splits the illumination light beam multiple times to output a uniformized light beam, eliminating the need for symmetric blue light incidence and reducing the complexity of the optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional reflective elements and light splitting elements are added to achieve symmetric blue light incidence, then color uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies asymmetry by designing the light uniformizing element with a specific asymmetric internal structure (light splitting surface at 45 degrees) that accepts oblique incident light and converts it to uniform symmetric output. This eliminates the need for additional reflective elements to create symmetric incidence, as the asymmetric internal structure performs the symmetry conversion function internally.
Solution Approach 2:
The patent merges the functions of multiple optical elements into a single light uniformizing element. The element integrates light splitting, light uniformizing, and angle distribution functions that previously required separate reflective elements and light splitting elements, thereby reducing device complexity while maintaining color uniformity.
2Manufacturing precision
If additional light splitting element is added to achieve symmetric blue light incidence, then color uniformity is improved, but light energy efficiency decreases due to brightness loss
Solution Approach 1:
The patent combines the light splitting function and light uniformizing function into a single element, eliminating the need for separate light splitting elements that caused brightness loss. The integrated design reduces the number of optical interfaces and reflections, thereby minimizing energy loss while achieving both symmetric output and color uniformity.
Solution Approach 2:
The patent converts the potentially harmful effect of oblique incident light (which normally causes poor color uniformity) into a beneficial feature. By designing the light uniformizing element to specifically accept oblique incidence and internally convert it to uniform symmetric output, the element transforms what was previously a problem into an advantage, eliminating the need for additional energy-lossy optical elements.
3Manufacturing precision
If additional optical elements and mechanical fixing parts are added to achieve symmetric blue light incidence, then color uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple functions (light splitting, reflection, and uniformizing) into a single integrated light uniformizing element, eliminating the need for multiple separate optical elements and their associated mechanical fixing parts. This integration simplifies the manufacturing process and reduces assembly complexity, thereby lowering manufacturing cost while maintaining color uniformity.
Solution Approach 2:
The patent extracts and eliminates unnecessary optical elements and mechanical fixing parts from the optical system. By designing the light uniformizing element to perform multiple functions internally, the patent removes redundant components that increased manufacturing cost, achieving color uniformity with a more streamlined design.
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 enhances light energy efficiency, reduces costs by minimizing the number of optical elements, and improves the display effect by maintaining uniform light angle distribution even with oblique incidence.
Implementation Method 1
the illumination light beam is split multiple times by the light splitting surface
Data Source
AI summary
An illumination system, including a light source module and a light uniformizing element, is provided. The light source module provides an illumination light beam. The light uniformizing element has a light incident surface and a light exit surface opposite to the light incident surface, and includes at least one light splitting surface. The light splitting surface is located inside the light uniformizing element. A normal vector of the light splitting surface is perpendicular to a central axis of the light uniformizing element. The illumination light beam is incident to the light incident surface of the light uniformizing element at an oblique angle, and the illumination light beam is split multiple times by the light splitting surface, so that the light uniformizing element outputs a uniformized illumination light beam at the light exit surface. A projection device and a light uniformizing element are also provided.