Pixel Circuit Topology for Threshold Compensation and Compact Layout
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Solution Overview
Problem
Existing display devices face challenges in achieving high resolution due to increased pixel size and complexity from added components for threshold voltage compensation and initialization, leading to luminance deviations between pixels.
Innovation Solution
A pixel design incorporating specific transistors and capacitors, including a first transistor with a gate electrode connected to a first node, a second transistor with a gate electrode receiving a first gate signal, and additional components for threshold voltage compensation and initialization, allowing for efficient voltage application and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If components for threshold voltage compensation and initialization are added to improve display quality, then luminance uniformity is improved, but pixel size increases
Solution Approach 1:
The patent combines multiple functions into shared circuit elements. Specifically, the first node serves dual purposes: it stores threshold voltage compensation information via the first capacitor and simultaneously serves as the gate electrode connection for the first transistor. This merging of functions allows threshold voltage compensation to be achieved without adding separate dedicated circuitry that would increase pixel area.
Solution Approach 2:
The gate electrode connection node (first node) is designed to perform multiple functions: storing compensation voltage, controlling the first transistor, and serving as an input for data voltage through the second transistor. This multi-functional design eliminates the need for separate dedicated circuits for each function, thereby maintaining compact pixel size while achieving threshold voltage compensation and initialization capabilities.
2Reliability
If components for threshold voltage compensation and initialization are added to improve display quality, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges threshold voltage compensation and initialization functions into existing circuit pathways. The first capacitor connects to the gate electrode node, utilizing the same node for both compensation storage and transistor control. The second transistor provides a universal input path that can deliver data voltage during normal operation and initialization voltage during initialization, eliminating the need for separate dedicated transistors and lines for each function.
Solution Approach 2:
The second transistor is designed with universal functionality: it connects the data line to the first node during normal data writing operations, and can also deliver initialization voltage to the first node when needed. This multi-functional design reduces the total number of transistors and connection lines required, as a single transistor handles multiple operational modes rather than requiring separate dedicated transistors for each function.
Data Source
AI summary
A pixel includes a first transistor including a gate electrode connected to a first node, and a second electrode connected to a second node, a second transistor including a first electrode connected to the first node, a third transistor including a gate electrode to receive a second gate signal, and a first electrode connected to a third node, a fourth transistor including a second electrode connected to the first node, a fifth transistor including a first electrode connected to the second node, and a second electrode connected to the third node, a first capacitor including a first electrode connected to the first node, a second capacitor including a first electrode connected to the second node, and a second electrode to receive the second gate signal, and a light-emitting element including a first electrode connected to the third node, and a second electrode to receive a second power voltage.