Pixel Circuit Capacitor Network for OLED Flicker Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pixel circuits in organic light emitting displays suffer from flicker due to coupling phenomena between nodes, which degrade display quality.
Innovation Solution
Incorporation of capacitors and transistors in the pixel circuit to compensate for luminance variations, reducing flicker and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit is used, then the device complexity is low, but flicker occurs due to coupling phenomena between nodes
Solution Approach 1:
The pixel circuit is divided into functionally independent modules: a driving transistor module for controlling current, a first capacitor module for storing drive voltage, a second capacitor module for compensating luminance variations, and a light emitting diode module. This segmentation isolates coupling phenomena between nodes by providing dedicated compensation paths, reducing flicker while maintaining manageable circuit complexity through modular organization.
Solution Approach 2:
The second capacitor acts as an intermediary element between the driving transistor and the light emitting diode, specifically compensating for luminance variations caused by coupling phenomena. This intermediary compensation mechanism absorbs the harmful effects of node coupling without requiring complete redesign of the entire pixel circuit, thus improving reliability with minimal increase in overall complexity.
2Reliability
If additional capacitors and transistors are added to compensate for luminance variation, then flicker is reduced, but the device complexity increases
Solution Approach 1:
The first capacitor serves multiple functions: it stores the drive voltage for the light emitting diode and simultaneously compensates for threshold voltage variations of the driving transistor. The second capacitor specifically compensates for luminance variations caused by coupling phenomena. This multi-functionality approach reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving comprehensive luminance stability.
Solution Approach 2:
The circuit compensates for luminance variations by dynamically adjusting voltage parameters through the capacitors. The first capacitor maintains the drive voltage level, while the second capacitor adjusts for coupling-induced variations. By changing voltage parameters rather than requiring complex structural modifications, the solution achieves luminance stability with minimal impact on device complexity.
Data Source
AI summary
The present disclosure relates to a pixel circuit and a display apparatus comprising the pixel circuit. A pixel circuit according to an exemplary embodiment of the present disclosure may include a driving transistor including a gate electrode, a first electrode, and a second electrode, a first transistor connected to the gate electrode and the second electrode, a second transistor connected to the first transistor and the gate electrode, a third transistor connected to the second electrode and the first transistor, a first capacitor connected to the gate electrode, the first transistor, the second transistor, and a high potential power line, a second capacitor connected to the high potential power line, the first capacitor, and the second transistor, and a light emitting diode connected to the third transistor and the low potential power line.