Display System Light Spot Segmentation for Brightness and Resolution
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Solution Overview
Problem
Conventional projection display systems in beam scanning mode face challenges in achieving both high brightness and high resolution simultaneously due to limitations in light beam collimation and spot size, particularly with single-mode lasers, and the narrow modulation bandwidth of light sources.
Innovation Solution
A display system that includes a light source system, a scanner, a spatial light modulator, and a processing and control system, where the light source system emits a light beam scanned onto the spatial light modulator in the form of a light spot corresponding to multiple pixels, allowing for simultaneous modulation of light spot brightness and image modulation, enabling higher dynamic range image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-mode laser is used to achieve high resolution through good beam collimation and small spot size, then the resolution is improved, but the output brightness is limited
Solution Approach 1:
The patent divides the light spot into multiple sub-spots, each corresponding to multiple pixels of the spatial light modulator. This segmentation allows the use of a larger, brighter light spot while maintaining effective resolution through the SLM's pixel structure, thus resolving the contradiction between brightness and resolution.
2Illumination intensity
If a multi-mode laser is used to increase output brightness, then the brightness is improved, but the light beam collimation and spot size cannot achieve high resolution requirements
Solution Approach 1:
The patent introduces an optical shaping device as an intermediary between the multi-mode laser and the spatial light modulator. This device conditions the light beam to achieve the necessary collimation and spot size control, enabling the use of high-brightness multi-mode lasers while maintaining high resolution.
3Manufacturing precision
If the light spot size is reduced to improve resolution, then the resolution is improved, but the brightness is reduced
Solution Approach 1:
The patent segments the light spot into multiple sub-spots that collectively cover a larger area with higher total brightness. Each sub-spot corresponds to multiple SLM pixels, allowing the system to maintain high resolution through the SLM's pixel structure while using a larger, brighter overall light spot.
4Measurement precision
If the scanning light spot precision is increased to improve image sharpness, then the image quality is improved, but the system complexity and difficulty increase
Solution Approach 1:
The patent segments the imaging function between the scanner and the spatial light modulator. The scanner provides coarse positioning while the SLM's pixel structure provides fine resolution. This segmentation reduces the precision requirements for the scanning system while maintaining high image quality.
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 reduces the demands on scanning precision and light spot size, allowing for higher brightness and resolution, and addresses the limitations of single-mode lasers and narrow modulation bandwidths, enabling improved image display with higher dynamic range.
Implementation Method 1
a scanner configured to scan the light beam emitted from the light source system on a surface of a spatial light modulator in form of a light spot
Implementation Method 2
the spatial light modulator configured to modulate the light spot projected on the spatial light modulator by the scanner, according to an image modulation signal from a processing and control system
Implementation Method 3
the light-source modulation device configured to adjust an output brightness of the light source system according to the light-source time-sequence modulation signal in(t)
Data Source
AI summary
A display system includes: a light source system configured to emit light beams; a scanner configured to scan the light beams on the surface of a spatial light modulator in the form of a light spot, the light spot corresponding to multiple pixels of the spatial light modulator; a spatial light modulator configured to modulate, according to an image modulation signal from a processing and control system, the light spot projected onto the spatial light modulator by the scanner to output image light; a processing and control system configured to output a light source timing modulation signal to a light source modulation device according to an input image signal and output an image modulation signal to the spatial light modulator; and a light source modulation device configured to adjust the output brightness of the light source system according to the light source timing modulation signal.