Mapping Luminance Values for Multi-Channel Display Controllers
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Solution Overview
Problem
Conventional LED display controllers with only three color channels struggle to accurately transmit and display images with four or more color channels, leading to artifacts due to limited bit allocation and resolution.
Innovation Solution
A method that maps luminance values for each color channel using a function based on human color perception, employing analytical models like CIE L*a*b* color space, and applying transformations and inverse transformations to minimize perceptible errors, allowing a conventional 3-color channel player to drive a display system with more than three color channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional 3-color channel player is used to control a display system with 4 or more color channels, then device complexity is reduced and ease of operation is improved, but manufacturing precision and measurement precision deteriorate due to limited bit allocation
Solution Approach 1:
The patent transforms the color data from a 4-channel RGBW format into a 3-channel format with enhanced bit depth (e.g., 10-bit or 12-bit per channel). This parameter change in data representation allows the conventional 3-channel player to handle what would otherwise require 4 channels, maintaining color precision while using simpler hardware
Solution Approach 2:
The patent introduces an intermediary transformation process that converts between color spaces and bit depths. This intermediary step allows data to be adapted from the display system's native 4-channel format to the player's 3-channel format, preserving information through mathematical transformation rather than direct hardware expansion
2Ease of manufacture
If bit allocation is limited to 8 bits per color channel, then ease of manufacture is improved, but loss of information increases due to quantization artifacts
Solution Approach 1:
The patent changes the bit depth parameter from the conventional 8 bits to higher values (10-bit or 12-bit) for the transformed color channels. This parameter increase provides sufficient precision to represent the original 4-channel color data without loss, while still being compatible with conventional players through the transformation process
Solution Approach 2:
The patent trades one dimension (number of color channels) for another dimension (bit depth per channel). By reducing from 4 channels to 3 channels but increasing bit depth from 8 to 10 or 12 bits, the total information capacity is maintained or improved, avoiding quantization artifacts while keeping manufacturing simple
Data Source
AI summary
A display controller having only three color channels per pixel is used to control a display system having four or more color channels. Mapping of the possible luminance values for each color channel of each pixel to the 2n intervals represented by the n bits in each color channel are provided according to a function that is based on human color perception, so as not to generate artifacts.