Arc-Shaped Diffuse Cells for Projector Light Uniformity
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Solution Overview
Problem
Existing light source units in projectors face challenges in achieving uniform luminance due to the rectangular shape of lens cells, which requires limiting the entrance angle of diffuse light, making it difficult to maintain even illumination across the projection area.
Innovation Solution
A light source unit with a diffuse plate featuring arc-shaped diffuse cells arranged in two directions at right angles, allowing for different diffuse angles in each direction to enhance light diffusion and uniformity, paired with a microlens array designed to match the aspect ratio of the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If lens cells are made rectangular to match the display device aspect ratio, then the shape matches the display device, but the entrance angle of diffuse light must be limited, making it difficult to achieve uniform luminance
Solution Approach 1:
The patent applies curvature by using arc-shaped diffuse cells instead of rectangular shapes. The diffuse cells have a curved surface that diffuses light in multiple directions, allowing diffuse light with various entrance angles to be properly directed to the display device while maintaining uniform luminance distribution across the rectangular display area.
2Ease of operation
If the diffuse angle of the diffuse plate is reduced to match lens cell width, then light can exit properly from rectangular lens cells, but it becomes difficult to make the light uniform
Solution Approach 1:
The diffuse plate is segmented into multiple arc-shaped diffuse cells arranged in a matrix. Each diffuse cell independently diffuses light in a controlled manner, and the collective arrangement of these segmented cells achieves both proper light exit control and uniform luminance distribution across the display device.
3Illumination intensity
If arc-shaped diffuse cells with different diffuse angles in different directions are used, then light uniformity is improved, but the device complexity increases
Solution Approach 1:
The diffuse plate employs local quality by giving different diffuse characteristics to different regions. Specifically, diffuse cells in different positions have different diffuse angles tailored to their local requirements, allowing optimal light distribution across the entire display area while maintaining a relatively simple overall structure.
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 improves the uniformity of light distribution, reducing luminance unevenness and enhancing the efficiency of light utilization across the projection area, ensuring a more consistent image projection.
Implementation Method 1
a solid light emitting device which emits light source light
Implementation Method 2
a diffuse plate which diffuses the light source light
Implementation Method 3
a microlens array having a plurality of lens cells which are arc-shaped convex lenses. Then, the light is collected by a collective lens
Data Source
AI summary
According to an embodiment of the invention, there is provided a light source unit including a solid light emitting device which emits light source light, a diffuse plate which diffuses the light source light, and a light guiding device which diffuses light which exits from the diffuse plate, wherein the diffuse plate has a plurality of arc-shaped diffuse cells arranged along either of a first direction of an exit side surface thereof which lies opposite to an entrance side where the light source light enters and a second direction that intersects the first direction at substantially right angles, and wherein a diffuse angle in the first direction differs from a diffuse angle in the second direction.