Pixel Driving Circuit With Dual Reset for Stable Gate Potential
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Solution Overview
Problem
Existing AMOLED pixel driving circuits face issues with display quality due to voltage fluctuations affecting the gate potential of the driving transistor, leading to inconsistent display effects.
Innovation Solution
A pixel driving circuit with a dual energy storage element and dual reset sub-circuit design, including a first reset sub-circuit for initializing a third node and a second reset sub-circuit for resetting the gate of the driving transistor, along with a data writing sub-circuit and light emitting control sub-circuit, to stabilize the gate potential and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single energy storage element design is used, then the device complexity is low, but the gate potential is unstable leading to poor display quality
Solution Approach 1:
The patent divides the single energy storage element into two separate energy storage elements (first and second energy storage elements), each responsible for storing different voltage signals. This segmentation allows independent control and stabilization of different node potentials, thereby improving display quality while managing complexity through functional separation.
Solution Approach 2:
The patent introduces a second reset sub-circuit as an intermediary component that specifically manages the reset operation of the gate node. This intermediary structure mediates between the voltage fluctuations and the gate potential, providing stable gate control and improving display quality without requiring complete redesign of the entire circuit.
2Reliability
If voltage fluctuations are allowed to affect the gate potential, then the device operation is simple, but the display quality becomes inconsistent
Solution Approach 1:
The patent implements preliminary reset actions through the second reset sub-circuit before the gate potential can be affected by voltage fluctuations. By pre-establishing stable reference potentials and preparing the gate node in advance, the circuit prevents display quality inconsistency without requiring complex real-time correction mechanisms.
Solution Approach 2:
The patent changes the electrical parameters (voltage levels, potential references) at the gate node through controlled reset operations. By adjusting and stabilizing these electrical parameters through the dual reset sub-circuit design, the patent ensures consistent display quality while maintaining manageable circuit complexity.
3Reliability
If the gate of the driving transistor is not reset, then the circuit operation is simple, but the display quality deteriorates due to voltage fluctuations
Solution Approach 1:
The patent segments the reset function into two independent reset sub-circuits: one for the data writing node and another for the gate node. This segmentation allows targeted reset operations where the second reset sub-circuit specifically addresses gate potential stabilization, improving display quality without requiring a completely complex reset mechanism across the entire circuit.
Solution Approach 2:
The patent applies local quality by implementing reset functionality specifically where needed - the second reset sub-circuit is dedicated to resetting the gate node with appropriate reference voltage, while other parts of the circuit have their own specialized reset mechanisms. This localized approach improves display quality through precise gate control without unnecessarily increasing overall circuit complexity.
Data Source
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AI summary
A pixel driving circuit, a driving method thereof, a display substrate, and a display apparatus are disclosed. The pixel driving circuit includes a driving transistor, first and second reset sub-circuits, a light emitting control sub-circuit, a data writing circuit, and first and second energy storage elements; the first reset sub-circuit is configured to write an initialization voltage signal to a third node in response to a first reset signal; the second reset sub-circuit is configured to, in response to a second reset signal, turn it conductive between a gate of the driving transistor and a fourth node and reset the two; the data writing sub-circuit is configured to write a data voltage signal to the second energy storage element in response to a scanning signal; and the light emitting control sub-circuit is configured to turn it conductive between a first electrode of the driving transistor and a power supply terminal in response to a first light emitting control signal, and transmit the data voltage signal to the gate of the driving transistor in response to a second light emitting control signal.