Display Data Compression With Color Conversion for Lower Interface Power
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Solution Overview
Problem
The increased power consumption of display interfaces due to high data size and resolution in portable devices, such as smartphones, leads to reduced battery life, necessitating a solution to reduce power consumption while maintaining high display quality.
Innovation Solution
A data processing apparatus and method that performs display data compression and decompression with color format conversion, utilizing a compression circuit and decompression circuit with pre-processors and post-processors to convert and compress data in a different color domain, reducing data size and power consumption during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display resolution is increased to achieve higher display quality, then display quality is improved, but power consumption of the display interface increases
Solution Approach 1:
The patent segments the display data processing into multiple stages: color domain conversion, compression, transmission, decompression, and color space conversion. By dividing the data stream into separate color components (Y, U, V channels) and processing them independently through compression algorithms, the system reduces overall data transmission requirements while maintaining display quality
Solution Approach 2:
The patent changes the color domain parameter from RGB to YUV color space, which allows for more efficient compression. The YUV color space separates luminance (Y) from chrominance (U, V) components, enabling differential compression strategies where chrominance can be compressed more aggressively without significantly impacting perceived display quality
2Measurement precision
If display resolution is increased to achieve higher display quality, then display quality is improved, but data size increases
Solution Approach 1:
The patent segments display data into separate color channels (Y, U, V) and applies different compression techniques to each channel. The luminance channel (Y) which carries most of the visual information is compressed with higher fidelity, while chrominance channels (U, V) are compressed with lower fidelity, reducing overall data size while maintaining perceived quality
Solution Approach 2:
The patent transforms display data from RGB color space to YUV color space, changing the representation parameters to enable more efficient compression. This parameter change allows the system to exploit the human visual system's characteristics where luminance information is more critical than chrominance information
3Productivity
If color format conversion is performed to enable compression, then data compression efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent performs color domain conversion (RGB to YUV) as a preliminary action before compression. By pre-converting the color space, the system prepares the data in a format that is optimized for compression, separating luminance and chrominance components early in the processing chain
Solution Approach 2:
The patent introduces an intermediary color domain (YUV) between the source RGB data and the compression algorithm. This intermediary representation serves as a bridge that enables more efficient compression by exploiting the statistical properties and human visual characteristics embedded in the YUV color space
Data Source
AI summary
A data processing apparatus has a compression circuit and an output interface. The compression circuit has a pre-processor and a compressor. The pre-processor receives a first input display data in a first color domain, and performs a color format conversion upon the first input display data to generate a second input display data in a second color domain, wherein the second color domain is different from the first color domain. The compressor performs compression in the second color domain, wherein the compressor is arranged to compress the second input display data into a compressed display data in the second color domain. The output interface packs an output display data derived from the compressed display data into an output bitstream, and outputs the output bitstream via a display interface.