Reflective Screen with Mixed Inclination Angles for Close-Range Projection
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Solution Overview
Problem
Existing reflective screens experience significant luminance reduction and variation when a projector is placed close to the screen, as existing technologies fail to effectively compensate for changes in the positional relationship between the projector and the screen, leading to uneven brightness across the screen surface.
Innovation Solution
A reflective screen with multiple reflective surfaces, including first and second reflective surfaces with varying inclination angles, arranged in a mixed form to reflect projection light uniformly across the screen, regardless of the projector's position, and a scale unit to indicate optimal projector placement, ensuring consistent luminance and reducing moire effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a projector is placed close to the screen, then space utilization is improved, but luminance reduction and luminance variation increase
Solution Approach 1:
The screen surface is divided into multiple reflective surfaces with different inclination angles. Each reflective surface is designed to reflect light from a specific incident angle range, allowing the screen to effectively handle projection light from various distances and positions, thereby maintaining luminance uniformity even when the projector is placed close to the screen.
Solution Approach 2:
Different regions of the screen have reflective surfaces with locally optimized inclination angles. The inclination angle of each reflective surface is specifically designed to match the incident angle of projection light from the intended projector position, ensuring that each local area of the screen optimally reflects light for its specific zone, thus maintaining overall luminance uniformity.
2Ease of manufacture
If a single reflective surface with fixed inclination angle is used, then manufacturing is simplified, but luminance variation increases when projector position changes
Solution Approach 1:
Instead of using a single reflective surface, the screen employs multiple segmented reflective surfaces with different inclination angles. Each segment is relatively simple to manufacture individually, but collectively they provide adaptability to various projector positions and incident angles, resolving the contradiction between manufacturing simplicity and positional adaptability.
Solution Approach 2:
The screen structure is designed to perform multiple functions by incorporating reflective surfaces with different inclination angles. This multi-functional design allows the same screen to effectively handle projection light from various distances and positions, making it universally adaptable to different projector placements while maintaining luminance uniformity.
3Length of moving object
If the incident angle of projection light increases, then projection distance is reduced, but luminance decreases
Solution Approach 1:
The screen incorporates reflective surfaces with locally optimized inclination angles that correspond to specific incident angle ranges. When projection light arrives at higher incident angles (shorter projection distances), the appropriate reflective surfaces with matching inclination angles efficiently reflect the light, maintaining luminance levels despite the increased incident angle and reduced projection distance.
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
The solution significantly reduces luminance variation and maintains high-quality image display even when the projector is positioned close to the screen, enhancing the allowable range of projector placement and preventing excessive brightness or luminance decline.
Implementation Method 1
a first reflective surface configured to reflect, in a substantially same direction, projection light beams projected from a first position; and a second reflective surface configured to reflect, in the substantially same direction, projection light beams projected from a second position different from the first position
Data Source
AI summary
A disclosed reflective screen is configured to display an image projected from a projection device located within a short distance. The reflective screen comprises a first reflective surface configured to reflect, in a substantially same direction, projection light beams projected from a first position, and a second reflective surface configured to reflect, in the substantially same direction, projection light beams projected from a second position different from the first position.