Laser Display Calibration via Optical Feedback
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Solution Overview
Problem
Laser-based display devices face challenges in maintaining calibration due to drift effects such as imprecise timing and spatial misalignment of laser activation, which can lead to image quality issues during continuous operation.
Innovation Solution
A method and system for adjusting optical components using optical feedback signals from calibration features, either off-screen or on-screen, to compensate for drift effects, allowing for real-time calibration during image generation without compromising image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser module transmits laser beams towards a spinning polygon with precise timing to excite phosphor pixels, then image quality is improved, but the system becomes sensitive to drift effects such as temperature changes causing timing errors and spatial misalignment
Solution Approach 1:
The patent implements a feedback mechanism where optical feedback signals are generated from laser beams scanned across calibration features. These feedback signals are used to dynamically adjust the activation timing of the laser module, compensating for drift effects that occur during continuous operation. This closed-loop control system maintains precision despite temperature changes and other environmental factors.
Solution Approach 2:
The patent incorporates calibration features that are scanned by laser beams before actual image generation begins. This preliminary scanning establishes reference timing and spatial alignment data that are used to pre-adjust the laser activation parameters. By performing calibration actions beforehand, the system establishes a baseline that compensates for expected drift during operation.
2Measurement precision
If calibration is performed offline when the display device is not in use, then calibration accuracy is improved, but the device cannot compensate for rapid drift effects that occur during continuous operation
Solution Approach 1:
The patent enables calibration actions to continue during device operation by using an off-screen calibration module. The laser beam scans calibration features in an off-screen region without interrupting the display of images on the screen. This allows continuous generation of feedback signals for drift compensation while maintaining uninterrupted useful action of image display.
Solution Approach 2:
The patent separates the calibration function from the display function by using an off-screen calibration module distinct from the image display area. The calibration features are disposed in a calibration module that is physically separate from the display screen, allowing calibration operations to occur in a dedicated region without affecting the quality or continuity of the displayed image.
3Object-affected harmful factors
If an off-screen calibration module is used to generate optical feedback signals, then light bleed into the display region is reduced, but the device complexity increases
Solution Approach 1:
The patent extracts the calibration function from the main display system by implementing an off-screen calibration module that is physically separate from the display screen. The calibration features are disposed in a calibration module that is spatially separated from the image display region, allowing calibration operations to occur without interfering with the display and without causing light bleed into the display area.
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 effectively maintains image quality by adjusting activation timings and vertical positions of laser beams, reducing the risk of light bleed and enabling continuous operation without the need for offline recalibration.
Implementation Method 1
a laser beam or multiple laser beams are used to excite phosphor material-containing regions (pixels) of a display screen
Implementation Method 2
A layer of phosphors disposed on the screen phosphoresces when impacted by the electrons, causing visible light to emanate from an outer surface of the screen
Implementation Method 3
a laser module transmits a laser beam towards a spinning polygon having a plurality of mirrored facets. As the polygon rotates, the different facets reflect the laser beam towards the display screen
Data Source
AI summary
A laser-based display device includes a plurality of ultraviolet lasers configured to excite a phosphor-containing display screen in order to produce visible light. The laser-based display device also includes a reference laser used for calibration operations. A control system within the laser-based display device causes the reference laser beam to scan across one or more calibration features, and adjusts optical components of the laser-based display device, including activation timing of the ultraviolet lasers, based on feedback patterns generated by the calibration features, to compensate for drift effects. The calibration features may be disposed off-screen or on-screen.