SELED Emitter Array for Overlapping Scan Zones
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Solution Overview
Problem
Current image-display systems using lasers or laser diodes for bright images are costly, while those using surface emitting LEDs (SELEDs) produce low intensity images, making it challenging to achieve a balance between cost and image brightness.
Innovation Solution
An optical image-display system employing an emitter array with multiple surface emitting light emitting diodes (SELEDs) that scan in overlapping zones, with each group of emitters illuminating a portion of the screen, allowing for increased brightness and reduced reflector rotation amplitude, enabling higher vertical scanning rates or frame rates for improved temporal resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lasers or laser diodes are used for image display, then image brightness is improved, but system cost increases
Solution Approach 1:
The display system divides the scanning task into multiple segments by using multiple SELEDs arranged in arrays, with each SELED scanning a portion of the display area. This segmentation allows the use of lower-cost SELEDs instead of expensive lasers while maintaining overall image brightness through parallel scanning of multiple zones.
2Ease of manufacture
If surface emitting LEDs are used for image display, then system cost is reduced, but image brightness decreases
Solution Approach 1:
Multiple SELEDs are combined in parallel arrays, with each SELED scanning an overlapping zone of the display area. The overlapping scan zones and simultaneous operation of multiple SELEDs merge to produce cumulative brightness that compensates for the lower individual intensity of SELEDs compared to lasers.
Solution Approach 2:
The system employs continuous scanning by multiple SELEDs across overlapping zones, ensuring that each region of the display receives continuous illumination. This continuous action from multiple sources maintains image brightness despite using lower-intensity SELEDs.
3Device complexity
If a single beam scans the entire display area, then device complexity is reduced, but temporal resolution decreases
Solution Approach 1:
The display area is segmented into multiple zones, each scanned by a dedicated SELED. This parallel segmentation of the scanning task allows simultaneous updating of multiple display regions, thereby improving temporal resolution without requiring a single complex high-speed scanner.
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 system achieves increased brightness and improved temporal resolution by using multiple SELEDs to illuminate overlapping zones, reducing the amplitude of reflector rotation and allowing for longer beam illumination times or higher frame rates, effectively addressing the cost and intensity limitations of previous technologies.
Implementation Method 1
An optical image-display system employs an emitter array with multiple surface emitting light emitting diodes (SELEDs) that scan in overlapping zones
Implementation Method 2
The scan assembly 20 includes a reflector 22, which simultaneously rotates back and forth in the horizontal (X) and vertical (Y) dimensions about pivot arms 24a and 24b and pivot arms 26a and 26b, respectively. By rotating back and forth, the reflector 22 sweeps the beam 18 in a two-dimensional (X-Y) pattern
Data Source
AI summary
A scan assembly includes an emitter array containing a plurality of optical emitters. Each optical emitter generates a corresponding image beam and the scan assembly scans the image beams in a plurality of overlapping display zones. The overlap of adjacent image display zones forms blending zones and the scan assembly can modulate the intensities of the image beams as a function of the position of the image beams in the blending zones. This modulation for a given blending zone may be a linearly increasing intensity of a first image beam and a linearly decreasing intensity of a second image beam.