Scanning-Beam Display Overlap Compensation
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Solution Overview
Problem
In scanning-beam display systems, adjacent display regions addressed by separate scanning beams often overlap, leading to increased brightness at edges and a tiled appearance, which adversely affects image quality by creating visible grids.
Innovation Solution
A control system adjusts the optical energies of scanning beams based on servo feedback signals to determine the overlap region and apply scaling factors, reducing the intensity of scanning beams in overlapping areas to maintain uniform brightness across the display screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate scanning beams are used to address adjacent display regions, then the display screen can be divided into multiple independent regions for scanning, but the overlapping areas at edges cause increased brightness and visible grids
Solution Approach 1:
The patent applies local quality by adjusting the optical energy of scanning beams specifically in overlapping regions while maintaining normal intensity in non-overlapping areas. The control system determines overlap regions by detecting scan line positions from adjacent subsystems and applies scaling factors to reduce beam intensity only where needed, creating spatially varying beam properties that compensate for the overlapping effect and maintain uniform brightness across the entire display screen.
2Area of stationary object
If multiple adjacent subsystems are used to scan different display regions, then larger display areas can be covered, but the tiled appearance and visible grids adversely affect image quality
Solution Approach 1:
The patent converts the harmful overlapping effect into a beneficial control mechanism. By deliberately allowing overlap between adjacent subsystems and then using feedback from servo marks to detect and quantify this overlap, the system transforms what would be a visual defect into an opportunity for active compensation. The control system uses scaling factors derived from overlap measurements to adjust beam intensity, turning the harmful tiled appearance into a means for achieving uniform brightness across the entire display area.
3Illumination intensity
If the scanning beam intensity is reduced in overlap regions, then brightness uniformity is improved, but the complexity of the control system increases
Solution Approach 1:
The patent implements feedback control by using servo marks positioned in each display region to generate feedback signals that indicate beam position. The control system continuously monitors these feedback signals to determine the actual overlap region between adjacent subsystems and dynamically adjusts scaling factors accordingly. This closed-loop feedback mechanism automates the complexity, allowing the system to maintain brightness uniformity without requiring manual calibration or complex predetermined adjustment schedules.
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 approach improves brightness uniformity, reduces the likelihood of visual artifacts, and allows for dynamic adjustment to compensate for screen motion, enabling larger or lighter displays without noticeable edge effects.
Implementation Method 1
a servo feedback detector positioned to receive feedback light of one or more of the at least one beam scanning on the display region, to detect the servo feedback mark from the feedback light
Implementation Method 2
a light source to generate at least one beam, the at least one beam including an excitation beam that carries image information
Data Source
AI summary
A display system includes a display screen, a plurality of subsystems, and a control system. The plurality of subsystems each generate an excitation beam that carries image information and a servo beam. For each subsystem, a servo feedback detector receives feedback light of the servo beam, detects the servo feedback mark, and produces a monitor signal. For each subsystem, a control unit is operable to adjust optical energies carried by the excitation beam using a scaling factor. Two adjacent subsystems of the plurality of subsystems are configured such that in operation the areas scanned by the excitation beams of the two subsystems overlap in an overlap region. The control system is configured to determine a range of the overlap region based on the monitor signals from the servo feedback detectors of the adjacent subsystems, and to determine the scaling factors for the excitation beams for the overlap region.