Display Device Sensing Driver Leakage Compensation
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Solution Overview
Problem
Conventional display devices do not account for current leakage characteristics when compensating image data, leading to errors in sensing data and non-uniform luminance due to differences in driving characteristics of pixels, such as threshold voltage and mobility of driving transistors and light emitting elements.
Innovation Solution
A display device with a sensing driver that generates leakage sensing data and threshold voltage sensing data, and a driving controller that compensates the threshold voltage sensing data based on the leakage sensing data, using average values and individual pixel data to adjust image data for uniform luminance, while considering current leakage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensing operation is performed without considering current leakage, then sensing process is simple, but sensing data contains errors leading to non-uniform luminance
Solution Approach 1:
The sensing operation is divided into two separate sensing periods: a first sensing period for measuring leakage current characteristics and a second sensing period for measuring threshold voltage characteristics. This segmentation allows each sensing operation to focus on a specific parameter, improving measurement accuracy while keeping individual sensing operations relatively simple.
Solution Approach 2:
The leakage current sensing is performed in advance in the first sensing period before the threshold voltage sensing in the second period. The measured leakage current data is then used to compensate for errors in the threshold voltage sensing data. This preliminary action eliminates the harmful effect of leakage current on subsequent measurements.
2Measurement precision
If leakage sensing data is collected and processed for all pixels, then compensation accuracy improves, but storage capacity requirements increase
Solution Approach 1:
Instead of storing all raw leakage sensing data for every pixel, the patent extracts only the essential information - the average leakage current value across all pixels. This extracted average value is then used to compensate threshold voltage sensing data, achieving effective compensation while minimizing storage requirements.
Solution Approach 2:
The patent transforms the leakage sensing data from individual pixel-level data to an averaged parameter representation. By changing the parameter from detailed individual measurements to a consolidated average value, the storage capacity requirement is significantly reduced while maintaining the ability to perform accurate compensation.
Data Source
AI summary
A display device including a display panel including pixels, a data driver configured to apply a data voltage to the pixels, a sensing driver configured to receive a sensing voltage from the pixels, a gate driver configured to apply a gate signal to the pixels, and a driving controller configured to control the gate driver, the sensing driver, and the data driver. The sensing driver generates leakage sensing data for current leakage characteristic of the pixels based on the sensing voltage received in a first sensing period, and generates threshold voltage sensing data for a threshold voltage of a driving transistor of the pixels based on the sensing voltage received in a second sensing period.