Display Stress Profile Compression via Transform Matrices
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Solution Overview
Problem
Existing display technologies, such as OLED displays, face image quality degradation due to uneven accumulation of truncation errors in compressed stress profiles, leading to non-uniform optical efficiency reduction over time, which affects image fidelity.
Innovation Solution
A method and system that transforms stress profiles using a first transformation matrix, compresses the transformed profiles, decompresses them, and applies an inverse transformation to mitigate errors, employing techniques like discrete Fourier transforms, Hadamard matrices, and unimodular transformations to distribute compression errors and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stress profiles are compressed to reduce memory requirements, then memory usage is reduced, but truncation errors accumulate unevenly resulting in loss of image quality
Solution Approach 1:
The patent applies a preliminary transformation (such as discrete cosine transform or Hadamard transform) to the stress profile data before compression. This transformation redistributes the data in a way that makes the compression errors more uniform when decompression occurs, thereby preserving image quality while still achieving memory reduction
Solution Approach 2:
The patent changes the representation parameters of the stress profile by transforming it into a different domain (frequency domain or transformed domain). This parameter transformation allows the same information to be stored with fewer bits while controlling the distribution of quantization errors to maintain image quality
2Productivity
If compression is applied to stress profile data, then storage efficiency is improved, but truncation errors result in non-uniform optical efficiency reduction
Solution Approach 1:
The transformation is applied before compression to pre-distribute the error characteristics. By transforming the stress profile into a different domain, the subsequent compression and truncation operations produce errors that, when transformed back, are distributed more uniformly across the display, maintaining optical efficiency uniformity
Solution Approach 2:
The patent converts the potentially harmful uneven distribution of truncation errors into a beneficial uniform distribution. The transformation process takes the errors that would normally concentrate in certain areas and redistributes them uniformly across the entire stress profile, turning a defect into an advantage
Data Source
AI summary
A system and method for operating a display. In some embodiments, the method includes: transforming a stress profile for a slice of the display, with a first transformation, to form a transformed stress profile; compressing the transformed stress profile to form a compressed transformed stress profile; decompressing the compressed stress profile to form a decompressed transformed stress profile; and transforming the decompressed transformed stress profile, with a second transformation, to form a decompressed stress profile, the second transformation being an inverse of the first transformation.