Display Interface Bandwidth Modulation for Power Reduction
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Solution Overview
Problem
The increasing demand for high-resolution displays in mobile devices strains the display data-path, leading to high power consumption due to elevated bit rates and lane widths, with existing compression techniques facing challenges in maintaining lossless compression across various image types and requiring costly decompression to determine optimal compression ratios.
Innovation Solution
Implementing a checksum mechanism to assess image quality during compression, allowing for dynamic adjustment of lane width, bit rate, and refresh rate using bandwidth modulation, which includes creating checksums for image lines or blocks and sending them with compressed data to ensure minimal data loss and optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If compression techniques are applied to reduce bandwidth, then power consumption is reduced, but image quality may be lost and determining optimal compression requires costly decompression
Solution Approach 1:
The patent applies preliminary action by computing checksums before compression to establish a baseline for image quality assessment. This allows the system to evaluate compression effects without performing full decompression, thereby reducing power consumption while maintaining image quality control.
Solution Approach 2:
The patent introduces checksums as an intermediary mechanism between compression and quality assessment. Instead of directly decompressing and comparing images (which consumes high power), the checksum serves as a lightweight mediator that enables quality verification with minimal computational overhead.
2Measurement precision
If higher bit rates and lane widths are used to support high-resolution displays, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the display interface parameters (bit rate, lane width, refresh rate) adjustable and adaptive rather than fixed. The system dynamically selects the appropriate combination of these parameters based on the actual image content and compression performance, allowing high resolution when needed while reducing power consumption during normal operation.
Solution Approach 2:
The patent changes multiple parameters simultaneously (compression ratio, bit rate, lane width, refresh rate) to optimize the trade-off between display quality and power consumption. By adjusting these parameters based on checksum-based quality assessment, the system achieves high resolution display with reduced power consumption.
3Loss of information
If lossless compression is maintained across all image types, then image quality is preserved, but compression effectiveness varies and requires expensive decompression to determine optimal ratio
Solution Approach 1:
The patent uses checksums as an intermediary to simplify the compression determination process. Instead of performing expensive decompression and visual quality assessment, the checksum provides a quick, reliable indicator of compression effectiveness, reducing device complexity while maintaining image quality control.
Solution Approach 2:
The patent replaces the mechanical process of decompression and quality assessment with a computational checksum-based evaluation system. This substitution significantly reduces the computational complexity and power consumption required to determine optimal compression ratios while maintaining lossless compression where applicable.
Data Source
AI summary
Bandwidth modulation may enable most of the display data-path to operate at a lower performance level to reduce power consumption by using compression as part of the display engine capability. Use of compression may afford a bit rate reduction and/or lane width reduction on the display interface to support high resolution display. With the bit rate and/or lane reduction and selective use of a refresh rate reduction, this technique can be used to lower the power consumption of the display data-path.