LPD Detector Angling for Seam Reduction
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Solution Overview
Problem
In laser-phosphor display (LPD) systems, the limited space for detector placement and the need to determine the states of raster scanned beams pose challenges in accurately detecting light reflections for system adjustments, leading to potential visibility of seams in tiled displays and increased noise from specular reflections.
Innovation Solution
A system with a plurality of detectors positioned to detect light from non-directly in front portions of the screen, using a filter layer with reflective regions and strategically placing detectors between the filter layer and focusing lenses to angle towards the screen, allowing for diffusely reflected light detection while minimizing specular reflection interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detectors are positioned directly in front of the screen to detect reflected light, then the detection setup is simple, but specular reflections create noise and reduce detection accuracy
Solution Approach 1:
The detector is positioned at an asymmetric angle relative to the screen normal, specifically angled to receive diffusely reflected light while avoiding the specular reflection path. This asymmetric placement eliminates the harmful specular reflection noise that would occur with symmetric (directly in front) positioning.
Solution Approach 2:
The system converts the challenge of diffuse reflection (which scatters light in many directions) into a benefit by positioning the detector to specifically capture this scattered light. The diffuse reflection, while potentially harmful due to loss of directional information, is actually utilized to illuminate screen portions not directly in front of the detector, enabling broader screen coverage.
2Reliability
If detectors are positioned to detect light from portions of the screen not directly in front, then seam visibility in tiled displays is reduced, but the detector placement becomes more complex and space-consuming
Solution Approach 1:
The detector is positioned in the space between the screen and focusing lenses, utilizing the third dimension (depth) rather than only lateral positioning. This vertical placement allows the detector to access light paths from multiple screen portions simultaneously, reducing seam visibility without requiring complex lateral arrangements of multiple detectors.
Solution Approach 2:
The single detector positioned at an angle serves multiple functions: it detects light from multiple portions of the screen simultaneously, provides feedback for raster scanning synchronization, and reduces seam visibility in tiled displays. This multi-functionality eliminates the need for separate detectors for each function, reducing overall system complexity.
3Measurement precision
If multiple detectors are used to detect light from different screen portions, then detection coverage is improved, but the number of components and system complexity increases
Solution Approach 1:
A single detector is positioned and angled to perform multiple detection functions simultaneously. The detector captures light from multiple screen portions, provides timing information for raster scanning, and enables seamless tiled display operation, replacing what would traditionally require multiple separate detectors.
Solution Approach 2:
The detector leverages the existing optical path and light scattering properties of the screen system to achieve broad coverage without requiring additional active components. The diffuse reflection inherent in the screen material is utilized to redirect light from multiple areas to the single detector position.
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 enhances the accuracy of light detection, reduces noise, and minimizes seam visibility in tiled displays by effectively capturing diffusely reflected light, enabling precise adjustments to the LPD system operation.
Implementation Method 1
a plurality of first reflective regions, wherein the plurality of first reflective regions are disposed on the second side of the filter layer opposite the first side and wherein each first reflective region is aligned with a corresponding space between at least one pair of adjacent subpixels
Implementation Method 2
each detector is positioned to detect scattered light from the screen that originates from one or more light sources disposed within a corresponding sub-enclosure
Data Source
AI summary
The present disclosure generally relates to a LPD system having a plurality of detectors for detecting light reflected from the back surface of the screen. The detectors are positioned to detect light from one or more portions of the screen that are not directly in front of the detector.