Pixel Driving Circuit Threshold Detection via Sub-circuit Segmentation
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Solution Overview
Problem
Prior pixel driving circuits for OLED displays inaccurately detect threshold voltage due to parasitic capacitance, resulting in prolonged detection times.
Innovation Solution
A pixel driving circuit with a first control sub-circuit, a second control sub-circuit, a third control sub-circuit, an energy storage sub-circuit, and a driving sub-circuit, where the third control sub-circuit provides a signal to short-circuit the light-emitting element during threshold detection, using a capacitor to adjust the potential until it reaches the threshold voltage of the driving transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pixel driving circuits are used for threshold voltage detection, then the detection process is simple, but the detection accuracy is low due to parasitic capacitance interference
Solution Approach 1:
The pixel driving circuit is divided into distinct functional modules: a first control sub-circuit for data signal input, a second control sub-circuit for power source terminal control, a third control sub-circuit for threshold detection, an energy storage sub-circuit with capacitor, and a driving sub-circuit. This segmentation allows each module to perform its specific function independently, improving threshold voltage detection accuracy by isolating the detection process from parasitic capacitance interference while maintaining manageable overall circuit complexity.
Solution Approach 2:
An energy storage sub-circuit comprising a capacitor is introduced as an intermediary element between the data signal terminal and the driving transistor. The capacitor stores the potential difference and provides a stable reference potential during threshold voltage detection, acting as a mediator that isolates the detection process from parasitic capacitance effects while enabling accurate threshold voltage measurement.
2Loss of time
If conventional threshold detection methods are used, then the circuit operation is fast, but the detection time is prolonged due to parasitic capacitance effects
Solution Approach 1:
The energy storage sub-circuit (capacitor) is pre-charged to store the potential difference between the data signal terminal and the power source terminal before threshold voltage detection begins. This preliminary action prepares the circuit in advance, allowing the threshold detection to proceed quickly without being delayed by parasitic capacitance charging effects, thus reducing detection time while maintaining accuracy.
Solution Approach 2:
The capacitor serves as an intermediary that decouples the threshold detection process from parasitic capacitance effects. By providing a stable, pre-stored potential reference, it enables faster detection without sacrificing accuracy, as the detection process is no longer constrained by the charging time constants associated with parasitic capacitance in conventional circuits.
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 configuration improves the accuracy of threshold voltage detection and reduces the time required for detection, eliminating the inaccuracies caused by parasitic capacitance.
Implementation Method 1
an energy storage sub-circuit configured to store a potential difference between the first node and the second node
Data Source
AI summary
The embodiments of the present disclosure disclose a pixel driving circuit, a pixel driving method and a display apparatus. A pixel driving circuit for driving a light emitting element, comprising: a first control sub-circuit providing a data signal terminal signal to a first node based on a first signal control terminal signal; a second control sub-circuit providing a first power source terminal signal to a fourth node based on a third signal control terminal signal, and a signal of the fourth node to a second node based on a second signal control terminal signal; a third control sub-circuit providing a second power source terminal signal to a third node based on a fourth signal control terminal signal; an energy storage sub-circuit storing a potential difference between the first node and the second node; and a driving sub-circuit transmitting a driving current for driving the light-emitting element.