Light-Emitting Module Mapping Function for Projection Uniformity
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Solution Overview
Problem
Conventional autostereoscopic displays face challenges in providing uniform image projection to viewers at varying distances due to non-linear mirror oscillation, manufacturing tolerances, and misalignments, limiting flexibility in adjusting the optimum viewing distance.
Innovation Solution
A light-emitting module with a computation unit that applies a mapping function to pre-distort the video signal, compensating for non-linearities and imperfections by adjusting the time axis of light pulses, allowing dynamic calibration and adaptation to different viewing distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light beam is deflected by a mirror oscillating periodically about an oscillation axis, then the projected light beam should provide all viewers at a certain distance from the display with information equally, but there is a non-linear relationship between the trigonometric function of the oscillatory motion of the mirror and the position function of the projected light beams in the plane of the viewer causing non-uniform projection
Solution Approach 1:
The system pre-calculates and stores mapping functions in a lookup table that compensate for the non-linear relationship between mirror oscillation and light beam position. By applying these pre-computed corrections to the video signal before display, the system achieves uniform projection across different viewing distances without requiring real-time complex calculations.
Solution Approach 2:
The system dynamically adjusts the mapping function parameters based on the desired viewing distance. By changing the scaling and offset parameters of the stored mapping function, the display can be calibrated for different optimal viewing distances while maintaining projection uniformity through the compensated mapping relationship.
2Manufacturing precision
If conventional autostereoscopic displays are set to an optimum viewing distance, then the image projection is optimized for that distance, but they cannot be set to a different optimum viewing distance and therefore cannot be used flexibly
Solution Approach 1:
The system implements dynamic calibration by allowing the mapping function parameters to be adjusted based on the desired viewing distance. The lookup table stores multiple mapping functions that can be selected and applied depending on the target viewing distance, enabling the display to adapt flexibly to different usage scenarios while maintaining optimal projection uniformity for each configuration.
3Manufacturing precision
If the mapping function is stored in the computation unit for pre-distorting the video signal, then non-linearities and manufacturing tolerances can be compensated, but the device complexity increases
Solution Approach 1:
Instead of implementing complex real-time calculation algorithms, the system creates a lookup table that copies pre-computed mapping relationships. This approach replaces complex computational processes with simple table lookups and interpolations, significantly reducing the computational burden while maintaining the ability to compensate for non-linearities and manufacturing tolerances.
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
Enables optimal calibration and flexible adjustment of light-emitting modules to ensure uniform image projection across a range of viewing distances, improving the 3D display experience by compensating for manufacturing tolerances and misalignments.
Implementation Method 1
at least one mirror mounted on the support, which mirror can be set periodically in oscillation about an oscillation axis by a drive... at least one light-emitting element arranged on the support, directed at the mirror
Data Source
AI summary
A light-emitting module for displaying or projecting a video signal comprises at least one mirror mounted so as to be able to oscillate and at least one light-emitting element, which is directed onto the mirror and is controllable via an input, and a computation unit that is connected to the light-emitting element and is configured to output at least one sample value of the video signal, which sample value appears at the input of said computation unit at a first time within a period of the mirror, at its output as a sample value at a second time, which is different from the first, within the same period according to a mapping function that is stored in the computation unit, wherein the computation unit has a control input that can be used to scale and/or offset the stored mapping function. The invention further comprises a display or projection apparatus having a multiplicity of such light-emitting modules, and a method for calibrating the light-emitting module and the apparatus.