Spatial Light Modulator Control via PRU and GPIO Data Transfer
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Solution Overview
Problem
Existing spatial light modulators (SLMs) are either high-cost due to ASIC control or limited in functionality by FPGA, lacking flexibility and efficiency in low-cost projection applications.
Innovation Solution
A system and method involving a memory controller transferring bit sequences from non-volatile to volatile memory, and then using programmable real-time units (PRUs) to rapidly move these sequences to scratchpad registers and GPIO registers for direct control of SLMs, enabling efficient image projection with low-cost, flexible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ASIC control is used for SLMs, then reliability and performance are improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive ASIC controllers with a software-based control system running on a general-purpose processor. The control logic is implemented as firmware that can be updated and modified, eliminating the need for costly custom-hardware ASIC designs. This allows reliable SLM control while significantly reducing manufacturing costs and enabling flexible updates without hardware changes.
Solution Approach 2:
The patent substitutes hardware-based ASIC control with a software/firmware-based control system. By moving the control logic from fixed hardware to programmable software, the system achieves comparable reliability while gaining flexibility and reducing costs associated with ASIC design, fabrication, and programming.
2Adaptability or versatility
If FPGA is used for SLM control, then functionality is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a general-purpose processor that can execute different firmware to control various SLM configurations and protocols. This universal approach allows the same hardware platform to adapt to different SLM types and control requirements through software updates, rather than requiring dedicated FPGA designs for each application.
Solution Approach 2:
The patent replaces FPGA-based control logic with software-implemented control routines on a general-purpose processor. This substitution reduces hardware complexity while maintaining functional versatility through programmable software that can be updated to support new control protocols and SLM configurations.
3Measurement precision
If complex cabling is used for SLM control, then control precision is improved, but system complexity and cost increase
Solution Approach 1:
The patent uses a universal parallel interface that can accommodate different SLM control requirements through software configuration. The same physical interface hardware supports multiple control protocols and data formats, eliminating the need for specialized cabling configurations for different precision requirements.
Solution Approach 2:
The patent achieves control precision through software-configurable parameters and timing sequences rather than physical cabling variations. By dynamically adjusting control parameters, data timing, and signal sequences in firmware, the system maintains precise control while using a fixed, simple physical interface.
Data Source
AI summary
A method includes transferring, by a memory controller from non-volatile memory to volatile memory, a bit sequence comprising video data and control information and transferring, by a first programmable real-time unit (PRU) from the volatile memory to a scratchpad register, the bit sequence. The method also includes transferring, by a second PRU from the scratchpad register to a general purpose input output (GPIO) register, the bit sequence, where the GPIO register is adapted to be coupled to a spatial light modulator (SLM).