Pixel Driving Circuit Voltage Pull-Up Speed Control
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Solution Overview
Problem
Current pixel driving circuits face limitations in the speed of electric potential pulling up at a second node during the charging phase of a storage capacitor, requiring multiple iterations for accurate potential adjustment without significant improvement.
Innovation Solution
A pixel driving circuit comprising a reset unit, driving unit, compensating unit, and control unit, where the control unit measures real-time voltage differences and activates a fourth switch to receive a second positive voltage, speeding up the voltage pulling up process at the second node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant electric potential is provided at a second node to charge a capacitor by electric current passing through a driving transistor, then the driving transistor can be detected when Vgs equals the threshold voltage, but the speed of electric potential pulling up of the second node is limited by the electric current and cannot pull up faster
Solution Approach 1:
The patent introduces a sampling resistor as an intermediary element to measure the electric current passing through the driving transistor. By converting the current into a measurable voltage signal through the sampling resistor, the system can detect the driving transistor state without being constrained by the limited current magnitude, thus resolving the contradiction between detection accuracy and pulling up speed
Solution Approach 2:
The patent replaces the direct current-based detection method with a voltage-based detection method using the sampling resistor. This substitution allows the system to measure the driving transistor state through voltage differences rather than directly through current, enabling faster detection without being limited by the electric current magnitude
2Speed
If iteration is used to alleviate the slow pulling up speed, then some improvement can be achieved, but multiple iterations are required and the improvement effect is not obvious
Solution Approach 1:
The patent applies preliminary action by pre-charging the second node through the fourth switch and sampling resistor before the actual detection process. This preliminary charging action prepares the node in advance, reducing the time required for subsequent detection operations and eliminating the need for multiple iterative operations
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
The solution significantly enhances the speed of voltage pulling up at the second node, improving the overall detection speed of the pixel driving circuit by utilizing real-time control signals to charge the node more efficiently.
Implementation Method 1
the control unit measures the second switch in real time, obtains a control signal base on a result of measuring in real time
Implementation Method 2
When the fourth switch is turned on, a second positive voltage received by the pixel driving circuit charges a second node to further speed up a voltage pulling up of the second node
Data Source
AI summary
A pixel driving circuit and a display panel are provided. The pixel driving circuit includes a control unit to output a control signal by detecting a voltage difference between two opposite ends of a sampling resistor, and to turn on a fourth switch by the control signal. When the fourth switch is turned on, a second positive voltage received by the pixel driving circuit charges a second node to further speed up a voltage pulling up of the second node to improve a detecting speed of the pixel driving circuit.