OLED Pixel Circuit Node Potential Stabilization via Maintenance Module
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Solution Overview
Problem
The stability of the potential at the node in OLED pixel circuits is compromised due to smaller pixel sizes and capacitor capacitance, affecting the display effect of OLED display panels, particularly in high-resolution displays.
Innovation Solution
A pixel circuit design incorporating a writing module, driving module, resetting module, switch module, power input module, and maintenance modules, including capacitors, to stabilize potentials at key nodes, ensuring stable operation and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel size is reduced to achieve high resolution, then the display resolution is improved, but the capacitance of the capacitor in the pixel circuit becomes smaller, causing potential instability at driving nodes
Solution Approach 1:
The patent merges the function of maintaining capacitor voltage with the driving transistor by adding a maintenance module that uses the driving transistor's source pole as one terminal of the maintenance capacitor. This allows the maintenance capacitor to stabilize the source pole potential without requiring additional dedicated circuit space, thus resolving the contradiction between high resolution (small pixel size) and potential stability.
Solution Approach 2:
The driving transistor serves multiple functions: it controls the light-emitting element current and simultaneously acts as one terminal for the maintenance capacitor through its source pole. This multi-functionality allows the pixel circuit to maintain stable potentials without increasing circuit complexity or pixel area, addressing the contradiction between resolution and reliability.
2Area of moving object
If the capacitor capacitance is reduced due to smaller pixel size, then the pixel area is reduced for high resolution, but the stability of potential at driving nodes deteriorates
Solution Approach 1:
The maintenance capacitor is designed to share the driving transistor's source pole as one terminal, merging two functions into one structure. This allows the circuit to maintain stable potentials without requiring additional capacitor area, thus resolving the contradiction between small pixel area and potential stability.
Solution Approach 2:
The patent introduces a new dimension of potential maintenance by adding the maintenance capacitor that specifically targets the source pole potential stability. This additional dimensional approach to stability control allows the system to achieve reliable operation even with reduced capacitor capacitance due to smaller pixel size.
Data Source
AI summary
The present disclosure provides a pixel circuit, a method for driving the same, a display panel and a display device. The pixel circuit includes a writing module configured to write a signal from a data signal end into a first node, a switch module configured to electrically connected the first node to a second node, a power input module configured to input a signal from a first power signal end into the second node, a resetting module configured to output a signal from a reference signal end to a third node and a fourth node, a driving module configured to output a signal from the second node to the fourth node, and a first maintenance module configured to stabilize potentials at the first node and the second node through the signals from the first node and the second node.