Organic Light Emitting Display Device Color Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting display devices face challenges in reducing memory capacity, leading to increased manufacturing costs and limited device size due to inefficient compression schemes that result in noise perception and low compression rates, especially for compensation coefficients.
Innovation Solution
A method is introduced that differentiates compression schemes for image data based on visual perceivability, using lossless compression for high perceivability colors and lossy compression for low perceivability colors, with specific techniques like bit shift and sub-sampling, to optimize memory usage and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lossless compression scheme is used for all image data, then image quality is maintained, but memory size becomes too large
Solution Approach 1:
The patent applies different compression schemes to different color channels based on their visual importance. Specifically, lossless compression is applied to red and green color data which have high visual perceivability, while lossy compression is applied to blue color data which has low visual perceivability. This local differentiation allows the system to maintain image quality where it matters most while reducing overall memory requirements.
2Quantity of substance
If lossy compression scheme is used to reduce memory size, then memory capacity is reduced, but noise is perceived in the image
Solution Approach 1:
The patent selectively applies lossy compression only to the blue color channel where noise perception is least noticeable to human viewers, while preserving lossless compression for red and green channels where noise would be more perceptible. This localized application of compression strategies minimizes noise perception while achieving memory reduction.
3Device complexity
If same compression scheme is used for all colors, then design is simplified, but compression rate is low and memory size is large
Solution Approach 1:
The patent differentiates compression approaches by color channel characteristics. Red and green channels use lossless compression with bit-shift operations, while blue channel uses lossy compression with sub-sampling. This differentiated approach achieves better compression rates and smaller memory size while maintaining acceptable design complexity through systematic color-based classification.
4Measurement precision
If memory capacity is increased to store uncompressed or losslessly compressed data, then image quality is maintained, but manufacturing cost increases and device size increases
Solution Approach 1:
The patent reduces manufacturing costs by applying lossy compression only to the blue color channel where quality degradation is least perceptible, while maintaining lossless compression for red and green channels. This selective approach achieves significant memory size reduction (lowering component costs and device form factor) while preserving overall image quality at acceptable levels.
Data Source
AI summary
Discussed is an organic light emitting display device and a driving method thereof, which reduce a size of corrected image data by using a color compression scheme to decrease a capacity of a memory, and reduce a size of an integrated circuit (IC) to increase a manufacturing yield. The method can include loading a compensation coefficient stored in a memory, correcting image data by applying the compensation coefficient to a data voltage supplied to a pixel, compressing, in different compression schemes, corrected image data of a color having high visual perceivability and corrected image data of a color having low visual perceivability, and synthesizing corrected image data of red, green, and blue pixels, which are compressed by the different compression schemes, to store the synthesized image data in a memory.