Electroluminescent Display Pixel Sensing for Faster Vth Compensation
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Solution Overview
Problem
Existing electroluminescent display apparatuses face limitations due to threshold voltage deviations between pixels, leading to luminance deviations and inefficiencies in image implementation, with current threshold voltage sensing technologies requiring long sensing times.
Innovation Solution
A method involving a first sensing process on some pixels for normal sensing, a second sensing process on all pixels for temporary sensing, and compensation calculations based on temporary sensing deviations to reduce overall sensing time and enhance threshold voltage compensation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold voltage sensing is performed on all pixels using conventional methods, then threshold voltage compensation performance is improved, but sensing time is excessively long
Solution Approach 1:
The patent divides pixels into two groups: first pixels (e.g., odd-numbered pixels) and second pixels (e.g., even-numbered pixels). The sensing circuit performs first sensing on first pixels during a first sensing period to obtain first sensing values, and performs second sensing on second pixels during a second sensing period to obtain second sensing values. This segmentation allows parallel or sequential processing that reduces total sensing time while maintaining compensation performance across all pixels.
Solution Approach 2:
The patent performs fast sensing on second pixels before the main compensation process, obtaining temporary sensing values that are used to calculate temporary sensing deviation values. These preliminary measurements allow the system to prepare compensation data in advance, reducing the critical path time for the overall compensation operation.
2Loss of time
If fast sensing is performed on all pixels, then sensing time is reduced, but threshold voltage compensation performance deteriorates
Solution Approach 1:
The patent applies different sensing strategies to different pixel groups based on their specific needs. First pixels receive comprehensive first sensing with full compensation processing, while second pixels receive second sensing that is optimized for speed. The sensing circuit and compensation circuit process these differently, with the compensation circuit calculating first compensation values for first pixels and delta compensation values for second pixels based on temporary sensing deviation values. This local differentiation maintains high compensation performance where needed while reducing overall sensing time.
3Productivity
If simple interpolation scheme is used for pixels without slow sensing, then processing speed is improved, but threshold voltage compensation performance is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the sensing circuit continuously monitors pixel threshold voltages through multiple sensing operations. The compensation circuit uses this feedback information to calculate appropriate compensation values. For second pixels, the system calculates temporary sensing deviation values based on second sensing values, then uses these deviations to determine delta compensation values that are applied to correct threshold voltage variations, ensuring accurate compensation without requiring slow sensing on every pixel.
Data Source
AI summary
An electroluminescent display apparatus includes a display panel, a sensing circuit performing a first sensing process on some pixels of the display panel to obtain a normal sensing value during a first sensing period and performing a second sensing process on all pixels of the display panel to obtain a temporary sensing value during a second sensing period, and a compensation circuit calculating a temporary sensing deviation value between adjacent pixels, based on the temporary sensing value, obtaining a compensation value for the some pixels, based on the normal sensing value, and obtaining a delta compensation value for the other pixels except the some pixels, based on the normal sensing value and the temporary sensing deviation value.