Recording Device Luminance Difference Quantization Error Correction
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Solution Overview
Problem
Display devices using emissive elements, such as OLEDs, suffer from burn-in due to continuous image display, requiring significant memory capacity and bandwidth to correct luminance values, and existing methods like quantization introduce errors that are difficult to manage.
Innovation Solution
A recording device that calculates a difference in luminance values between target and reference pixels, performs non-linear quantization, and corrects quantization errors based on a selected correction frame and quantization step, reducing memory requirements and error accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If luminance values of all pixels are totalized over decades of use to prevent burn-in, then burn-in prevention is improved, but memory capacity and bandwidth requirements increase significantly
Solution Approach 1:
The patent divides the display panel into multiple blocks, each containing multiple pixels. Instead of managing luminance values for all pixels individually, the system calculates totalized values per block and uses representative pixels within each block. This segmentation reduces the number of pixels whose luminance values need to be tracked and stored, thereby reducing memory capacity requirements while still providing effective burn-in prevention across the entire display.
2Quantity of substance
If quantization is applied to reduce data capacity, then memory requirements are reduced, but quantization errors increase and become difficult to manage
Solution Approach 1:
The patent implements a correction mechanism that operates periodically at predetermined intervals (every N frames). During these correction periods, the system calculates correction values based on the difference between actual luminance values and quantized luminance values, then applies these corrections to subsequent totalized values. This periodic correction approach allows the system to use coarser quantization (reducing data capacity) while periodically eliminating accumulated quantization errors, thereby maintaining measurement precision without requiring continuous high-precision data storage.
Data Source
AI summary
A device is provided that includes a subtraction portion that outputs a difference value between a target totalizing value, obtained by accumulating a luminance value of a target pixel up to a current frame, and a reference totalizing value corresponding to a luminance value of a reference pixel, adjacent the target pixel, accumulated up to the current frame; a quantization portion that quantizes the difference value and outputs a quantization value; and a quantization error correction portion that corrects the quantization value at a correction frame selected based on a quantization step of the quantization value and a quantization error of the quantization value.