Pixel Compensation Transistor for Leakage Current Management
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Solution Overview
Problem
Leakage currents in the circuit unit of pixels can lead to deterioration in display quality due to changes in current flow through light emitting elements, affecting image display.
Innovation Solution
A pixel configuration that includes a capacitor connected between a voltage line and a node, light emitting diodes, transistors, and a compensation transistor to manage and compensate for leakage currents, maintaining optimal current flow and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit unit controls current flow to light emitting elements, then display quality is maintained, but leakage currents cause deterioration in display quality
Solution Approach 1:
The patent implements a feedback mechanism where a compensation transistor monitors and adjusts for leakage currents in real-time. The compensation transistor's gate is connected to a node that senses the voltage change caused by leakage, and it automatically compensates by sourcing or sinking compensating current, thereby maintaining stable display quality despite the presence of leakage currents in other circuit elements.
Solution Approach 2:
The patent introduces a compensation transistor as an intermediary element that mediates the harmful effects of leakage currents. This compensation transistor acts as a buffer between the leakage sources (in switching transistors) and the light emitting element, isolating the harmful effects and preventing them from directly degrading display quality.
2Ease of operation
If multiple transistors are used to control current flow, then current management is improved, but leakage current paths increase
Solution Approach 1:
The compensation transistor creates a feedback loop that monitors the net effect of all leakage currents from multiple transistor paths and automatically compensates for their combined impact, allowing the use of multiple control transistors without proportionally increasing display quality deterioration.
Solution Approach 2:
The patent converts the harmful leakage currents into a measurable voltage change at the compensation transistor's gate node, which then drives the compensation mechanism. The leakage currents that would normally degrade performance are transformed into the control signal that activates the compensation response, turning a harmful effect into the basis for correction.
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 effectively prevents or reduces display quality deterioration by compensating for leakage currents, ensuring consistent and accurate image representation.
Implementation Method 1
a capacitor electrically connected between a first voltage line and a first node
Implementation Method 2
a light emitting diode including a first electrode electrically connected to a second node, and a second electrode electrically connected to a second voltage line
Implementation Method 3
a first transistor including a first electrode electrically connected to the first voltage line, a second electrode connected to the second node, and a gate electrode electrically connected to the first node
Data Source
AI summary
A pixel includes: a capacitor connected between a first voltage line and a first node; a light emitting diode including a first electrode connected to a second node, and a second electrode connected to a second voltage line; a first transistor; a second transistor; a third transistor including a first electrode connected to the first node, a second electrode connected to the second node, and a gate electrode to receive a first scan signal; a fourth transistor including a first electrode connected to the first node, a second electrode connected to a third voltage line to receive a third voltage, and a gate electrode to receive a second scan signal; and a compensation transistor including a first electrode connected to the first node, a second electrode connected to a fourth voltage line to receive a compensation voltage, and a gate electrode to receive a compensation control voltage.