Data Current Generation Circuit Threshold Compensation
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Solution Overview
Problem
The existing pixel driving current generation circuits in display technologies face issues with non-uniformity due to the deviation of real data current from theoretical data current caused by the threshold voltage of transistors, leading to poor display panel uniformity.
Innovation Solution
A data current generation circuit comprising a data voltage generation circuit, a data voltage transmission control circuit, a compensation control circuit, a capacitor, and a reference voltage writing circuit, which associates the threshold voltage of the transistor with its gate, allowing the capacitor to store and the reference voltage to compensate for the threshold effect, thereby improving the matching between data voltage and data current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transistor with threshold voltage is used to convert data voltage to data current, then the conversion function is achieved, but the real data current deviates from theoretical data current causing poor display uniformity
Solution Approach 1:
The patent introduces a feedback mechanism where the threshold voltage of the first transistor is sensed and fed back to the compensation control circuit. This feedback loop enables real-time detection of threshold voltage variations and automatic compensation through adjusted gate voltage, ensuring accurate data current output despite transistor parameter variations.
Solution Approach 2:
The patent dynamically adjusts the gate voltage of the first transistor based on its threshold voltage characteristics. By changing the gate voltage parameter in response to measured threshold voltage, the system compensates for transistor variations and maintains precise data current conversion, directly addressing the uniformity issue.
2Measurement precision
If a compensation control circuit is added to associate threshold voltage with gate voltage, then data current accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the compensation control circuit, first capacitor, and reference voltage writing circuit into an integrated threshold voltage compensation module that works in conjunction with the existing data voltage to data current conversion circuit. This merging approach achieves accurate compensation while minimizing additional complexity by consolidating functions.
Solution Approach 2:
The first capacitor serves as an intermediary element that stores the gate voltage adjusted for threshold voltage compensation. This capacitor mediates between the compensation control circuit and the first transistor, enabling precise threshold voltage compensation without requiring direct continuous control, thus simplifying the overall circuit architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the uniformity of the display panel by compensating for the threshold voltage effect, resulting in improved matching between data voltage and data current, thereby enhancing display panel uniformity and brightness consistency.
Implementation Method 1
The first capacitor includes a first electrode electrically connected to the gate of the first transistor and a second electrode electrically connected to a first reference voltage output terminal and is configured to store a voltage of the gate of the first transistor
Data Source
AI summary
A data current generation circuit includes a data voltage generation circuit, a data voltage transmission control circuit, a compensation control circuit, a first capacitor, a first transistor and a reference voltage writing circuit. The data voltage transmission control circuit transmits a data voltage from the data voltage generation circuit to a first electrode of the first transistor; the compensation control circuit is electrically connected to a gate and a second electrode of the first transistor separately and associates a threshold voltage of the first transistor with the gate of the first transistor; the first capacitor stores a voltage of the gate of the first transistor; the reference voltage writing circuit is electrically connected to the first electrode of the first transistor and a first reference voltage output terminal separately; and the second electrode of the first transistor serves as an output of the data current generation circuit.