OLED Pixel Degradation Sensing via Differential Baseline Interpolation
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Solution Overview
Problem
Existing OLED display devices face challenges in accurately sensing pixel degradation due to offsets between sensing integrated circuits (ICs) and channels, requiring significant time and expense for compensation.
Innovation Solution
A method and device for sensing pixel degradation in OLED display devices that generate degradation sensing data, estimate degradation based on input image data, set a degradation baseline for each sensing channel by dividing pixels into non-degraded and degraded regions, and interpolate data to determine degrees of degradation without performing offset compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset compensation is performed between sensing ICs and channels, then measurement precision is improved, but loss of time and manufacturing cost increase significantly
Solution Approach 1:
The patent extracts and eliminates the offset compensation step from the sensing process. By using a differential sensing architecture that measures the difference between sensing currents directly, the method removes the need for separate offset calibration procedures, thereby reducing time loss while maintaining measurement precision
Solution Approach 2:
The patent introduces a differential sensing mechanism as an intermediary that directly compares sensing currents from different pixels. This intermediary approach allows offset cancellation to occur automatically through the differential measurement process itself, eliminating the need for explicit offset compensation steps
2Measurement precision
If offset compensation is performed between sensing ICs and channels, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the offset compensation procedure from the manufacturing process. By designing the sensing circuitry to perform differential measurements that inherently cancel offsets, the method eliminates the need for additional calibration steps and associated manufacturing costs
Solution Approach 2:
The sensing system performs self-calibration through its differential measurement architecture. The circuit automatically compensates for offsets by comparing sensing currents in a differential manner, eliminating the need for external calibration equipment and procedures, thereby reducing manufacturing complexity and cost
3Measurement precision
If degradation baseline is set for each sensing channel independently, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the baseline setting process across all sensing channels by using a common reference current. Instead of independently setting baselines for each channel, the differential sensing architecture uses a shared reference that automatically establishes the baseline for all channels simultaneously, reducing device complexity while maintaining precision
Data Source
AI summary
In a method of sensing degradation of pixels in an organic light emitting diode (OLED) display device, the method includes: generating degradation sensing data for the pixels by sensing the degradation of the pixels; generating degradation estimation data for the pixels based on input image data for the pixels; setting a degradation baseline for each sensing channel based on the degradation estimation data; and determining degrees of degradation of the pixels based on a difference between the degradation sensing data and the degradation baseline.