Data Current Generation Circuit Threshold Voltage Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current pixel drive current generation circuits suffer from poor uniformity in display panels due to variations in threshold voltage of transistors, leading to deviations in data current from the intended data voltage, resulting in inconsistent light-emitting device brightness.
Innovation Solution
A data current generation circuit incorporating a threshold capture module, data voltage generation module, data voltage transmission module, and threshold voltage acquisition and superposition module, which captures and compensates for the threshold voltage of a transistor to ensure accurate data current output, thereby improving display panel uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pixel drive current generation circuit converts data voltage to data current using a transistor, then the data current can be supplied to the pixel circuit, but the threshold voltage of the transistor causes deviation between the converted data current and the intended data voltage, resulting in poor uniformity of the display panel
Solution Approach 1:
The patent applies preliminary action by capturing the threshold voltage of the transistor in advance before the data current conversion process. A threshold capture module stores the threshold voltage value, and a threshold voltage acquisition module retrieves it when needed. This pre-captured threshold voltage is then used for compensation during data current generation, eliminating the deviation caused by threshold voltage variations and improving both the accuracy of data current and the uniformity of the display panel.
2Device complexity
If the transistor generates data current directly from data voltage, then the circuit structure remains simple, but the threshold voltage variation causes inconsistent light-emitting device brightness across the display panel
Solution Approach 1:
The patent introduces an intermediary mechanism - a threshold voltage acquisition module and compensation module - that mediates between the data voltage input and the data current output. This intermediary retrieves the pre-captured threshold voltage and uses it to compensate for the transistor's threshold voltage effects during current conversion. This approach maintains relatively simple circuit structure while significantly improving display uniformity by eliminating the direct impact of threshold voltage variations on brightness consistency.
Data Source
AI summary
Provided are a data current generation circuit, a driving method therefor, a driver chip, and a display panel, where a threshold capture module of the data current generation circuit is connected between a gate and a second electrode of a first transistor and is configured to capture a threshold voltage of the first transistor, a data voltage generation module is configured to generate a data voltage, a data voltage transmission module is connected between the data voltage generation module and a threshold voltage acquisition and superposition module and is configured to transmit the data voltage generated by the data voltage generation module to the threshold voltage acquisition and superposition module when the data voltage transmission module is turned on, and the threshold voltage acquisition and superposition module is configured to acquire the threshold voltage of the first transistor.