Reduced Bandwidth Pulse Width Modulation for Portable Optical Projectors
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Solution Overview
Problem
Existing optical projection systems for portable devices face challenges in reducing power consumption and extending battery life, particularly when displaying static images, due to the continuous transmission of pixel data even when the image remains unchanged.
Innovation Solution
Implementing reduced bandwidth pulse width modulation by compressing image data before transmission to the spatial light modulator, using a digital controller to encode and decode data, and employing frame buffers to enhance data compression, thereby reducing the amount of data transmitted over the high-speed interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel data is continuously transmitted to the spatial light modulator, then image display is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by transmitting pixel data only at specific intervals rather than continuously. The system uses a frame buffer to store image data and transmits it to the spatial light modulator periodically, reducing the data transmission frequency while maintaining image display continuity. This periodic transmission approach significantly lowers power consumption of the high-speed interface while preserving reliable image projection.
2Use of energy by moving object
If data compression is applied to reduce bandwidth, then power consumption decreases, but data transmission accuracy may be compromised
Solution Approach 1:
The patent applies preliminary action by pre-processing and compressing pixel data before transmission to the spatial light modulator. The system uses a frame buffer to store and prepare compressed image data in advance, then transmits only the essential compressed data. This preliminary compression reduces the bandwidth required during transmission, thereby reducing power consumption while maintaining data transmission accuracy through proper compression algorithms that preserve image quality.
Data Source
AI summary
Methods and apparatus for reduced bandwidth pulse width modulation are disclosed. A system includes a digital controller circuit coupled to a data interface, the digital controller circuit configured to receive image data for display and further configured to encode line data for transmission to a spatial light modulator using a data compression scheme; and the spatial light modulator coupled to the data interface and configured to receive encoded data and to decode the encoded data to produce unencoded data corresponding to pixel data for display on an array of pixel elements in the spatial light modulator; wherein data transmitted from the digital controller circuit to the spatial light modulator further comprises encoded data that is formed from bit planes using a data compression scheme to form partial lines of data. Additional methods and apparatus are disclosed.