Display Driving with Memory-Based Threshold Compensation
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Solution Overview
Problem
Existing display technologies face challenges in compensating for threshold voltage variations of driving transistors in real time, leading to luminance deviations among subpixels and degraded image quality.
Innovation Solution
A display device and driving method that includes a plurality of data and reference voltage lines, with each subpixel connected to these lines, allowing for real-time compensation of threshold voltage variations by setting a voltage difference between nodes of the driving transistor to correspond to stored threshold voltage information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional threshold voltage compensation technology is used, then threshold voltage sensing is performed, but it takes a very long time to sense all driving transistors, preventing real-time compensation during display driving
Solution Approach 1:
The patent applies preliminary action by pre-storing threshold voltage information in a memory device before display driving occurs. During display operation, the controller retrieves pre-calculated threshold voltage compensation values from memory, eliminating the need for time-consuming real-time sensing of all driving transistors. This allows the system to maintain accurate threshold voltage compensation without sacrificing display performance or timing.
2Stability of the object's composition
If threshold voltage compensation is performed, then luminance uniformity improves, but device complexity increases due to additional sensing circuits and control mechanisms
Solution Approach 1:
The patent extracts the complex threshold voltage sensing and calculation operations from the real-time display driving circuitry and relocates them to a separate memory device. By storing pre-calculated threshold voltage compensation values in memory, the patent eliminates the need for complex sensing circuits and real-time calculations during display operation, thereby maintaining luminance uniformity while reducing device complexity.
3Manufacturing precision
If continuous threshold voltage monitoring is implemented, then image quality improves, but power consumption increases
Solution Approach 1:
The patent implements periodic action by performing threshold voltage sensing and compensation value calculation only during idle periods or at predetermined intervals, rather than continuously during display driving. The controller retrieves pre-stored compensation values from memory during normal operation, significantly reducing power consumption while maintaining image quality through periodic updates of the compensation data.
Data Source
AI summary
According to embodiments of the present disclosure, there may be provided a display device and a driving method. During a first type sensing time period during display driving, a voltage difference between a first node and a second node of a driving transistor is set to correspond to a threshold voltage stored in a memory, whereby it is possible to compensate for, in real time period, threshold voltage variations of driving transistors.