Pixel Driving Circuit Compensation for Transistor Hysteresis
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Solution Overview
Problem
The hysteresis effect in driving transistors of pixel driving circuits affects the display effect of display panels, leading to threshold value drift and impaired performance.
Innovation Solution
A pixel driving circuit is designed with a compensation circuit, light-emitting control circuits, and reset circuits to manage node signals, including a driving transistor and transistors configured to mitigate hysteresis through specific signal phases and transistor types, such as N-type and P-type transistors, to stabilize threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit is used, then the structure is simple, but hysteresis effect occurs in driving transistors causing threshold value drift and degraded display performance
Solution Approach 1:
The pixel driving circuit is segmented into multiple functional modules: driving circuit, compensation circuit, first light-emitting control circuit, first reset circuit, and second reset circuit. Each module performs a specific function to address the hysteresis effect independently, allowing the complex problem of threshold value drift to be solved through coordinated action of separate components rather than a single complex transistor design.
Solution Approach 2:
The compensation circuit performs preliminary action by compensating for the hysteresis effect before it significantly degrades display performance. The first reset circuit and second reset circuit also perform preliminary resetting of nodes to predetermined voltages before subsequent operations, preventing threshold value drift from accumulating and ensuring stable operation throughout the display refresh cycle.
2Stability of the object's composition
If reset circuits are added to eliminate hysteresis, then threshold value stability improves, but the number of circuits and transistors increases
Solution Approach 1:
The first reset circuit and second reset circuit are designed to serve multiple functions: they reset nodes to predetermined voltages, eliminate hysteresis effects, and prepare the circuit for the next operation cycle. The compensation circuit also serves dual purposes by both compensating for threshold voltage variations and stabilizing the driving current. This multi-functionality reduces the need for additional dedicated circuits.
Solution Approach 2:
The reset circuits automatically reset the nodes to predetermined voltages based on control signals, eliminating the need for external intervention or complex control mechanisms. The compensation circuit self-adjusts to compensate for hysteresis effects without requiring manual calibration or additional feedback components, allowing the circuit to maintain stability autonomously.
Data Source
AI summary
A pixel driving circuit, includes: a driving circuit, connected to a first node, a second node and a third node; a compensation circuit, connected to the first node, the third node and a first gate driving signal end; a first light-emitting control circuit, connected to the third node, a fourth node and a first enabling signal end; a first reset circuit, connected to the fourth node, a first initial signal end and a first reset signal end; and a second reset circuit, connected to the second node, a second initial signal end and a second reset signal end.