Anamorphic Transmissive Element for Light Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image projection devices experience variations in lighting intensity across the projected surface due to differences in light use efficiency among pixel light fluxes, which are not adequately addressed by existing dust prevention methods that often compromise optical performance.
Innovation Solution
A projective optical system incorporating a transmissive optical element with an anamorphic surface, curved to match the direction of the display screen, is used between the lens optical system and the projected surface to equalize light intensity by offsetting differences in incident angles and light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional dust prevention method is used, then dust entry is prevented, but light intensity uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating a light intensity distribution correction unit with non-uniform optical properties. The unit has a specific light transmittance distribution that varies across its surface, with higher transmittance in regions where light intensity is lower and vice versa. This local variation in optical characteristics compensates for the non-uniform light intensity caused by the dust prevention method, achieving both dust prevention and light uniformity.
2Illumination intensity
If a transmissive optical element with anamorphic surface is used, then light intensity uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the transmissive optical element with anamorphic surface. This single component simultaneously serves as a dust prevention method (by being positioned in the optical path) and a light intensity distribution correction unit (by having the specific anamorphic surface shape). The merging of these functions reduces the need for separate components, thereby managing device complexity while achieving light uniformity improvement.
Solution Approach 2:
The patent employs curvature principles by designing the transmissive optical element with an anamorphic surface that has specific curved profiles. The surface curvature is carefully designed to refract light in a manner that compensates for non-uniform light intensity distribution. The curved surface allows precise control over light path modification without requiring complex mechanical adjustment mechanisms.
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 configuration ensures even lighting intensity across the projected surface, improving image quality and reducing variations, while maintaining optical performance and preventing dust entry into the system.
Implementation Method 1
a transmissive optical element with an anamorphic surface, which is curved in a direction corresponding to a direction of a display screen of the image display element, is used between the lens optical system and the projected surface
Data Source
AI summary
A projective optical system comprises: a lens optical system including lenses; and a transmissive optical element having an anamorphic surface and being provided in an optical path between the lens optical system and a projected surface, wherein the transmissive optical element has a curvature with respect to a direction corresponding to a long side of a display screen of the image display element, and on a cross-sectional surface being perpendicular to the long side of the display screen, and with respect to light being emitted from the lens optical system and being incident to the transmissive optical element, a light intensity of a first light flux being incident to the transmissive optical element at a first incident angle is lower than a light intensity of a second light flux being incident to the transmissive optical element at a second incident angle being larger than the first incident angle.