Pixel Circuit Simplification for High-Resolution Displays
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Solution Overview
Problem
The existing pixel circuit is complex and occupies a large area, making it difficult to achieve high-resolution display devices.
Innovation Solution
A pixel circuit comprising a switching circuit, a storage circuit, a driving circuit, and a pull-down circuit, which selectively provides data signals to a node under control of power signals, allowing the data voltage of the pixel electrode to be maintained even when the source driving circuit stops outputting signals, thereby reducing the number of transistors and area occupied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase-locked loop is used to store the data voltage of the pixel electrode, then the data voltage can be maintained, but the structure becomes complex and occupies a large area
Solution Approach 1:
The patent extracts the essential function of voltage storage from the complex phase-locked loop structure, isolating only the necessary storage capacitor and associated control transistors. This extraction eliminates unnecessary circuit components while preserving the core functionality of maintaining data voltage in the pixel electrode.
Solution Approach 2:
The patent uses a simplified equivalent circuit model that copies only the essential elements needed for voltage storage (storage capacitor CST and minimal control transistors) rather than implementing the full phase-locked loop. This copying approach maintains the critical voltage-holding function while dramatically reducing circuit complexity and transistor count.
2Reliability
If a phase-locked loop is used to store the data voltage of the pixel electrode, then the data voltage can be maintained, but the area occupied increases
Solution Approach 1:
The patent extracts the essential function of voltage storage from the complex phase-locked loop structure, isolating only the necessary storage capacitor and associated control transistors. This extraction eliminates unnecessary circuit components while preserving the core functionality of maintaining data voltage in the pixel electrode.
Solution Approach 2:
The storage capacitor in the simplified circuit serves multiple functions: it stores the data voltage, maintains it during the display period, and works in conjunction with the minimal transistor network to provide both storage and control functions that would otherwise require separate dedicated components in a full phase-locked loop implementation.
3Reliability
If more transistors are used in the pixel circuit, then the data voltage can be maintained more reliably, but the number of transistors increases and area increases
Solution Approach 1:
The patent extracts the essential function of voltage storage from the complex phase-locked loop structure, isolating only the necessary storage capacitor and associated control transistors. This extraction eliminates unnecessary circuit components while preserving the core functionality of maintaining data voltage in the pixel electrode.
Data Source
AI summary
A pixel circuit including a switching circuit, a storage circuit, a driving circuit, and a pull-down circuit is disclosed. The switching circuit is configured for providing first and second power signals to the storage circuit according to a first gate-driving signal. The storage circuit is configured for providing a corresponding one of first and second data signals to a first node in response to one of the first and second power signals. The driving circuit is configured for writing the voltage signal of the first node into the pixel electrode according to a second gate-driving signal. The circuit structure of the pixel circuit of the present disclosure is relatively simplified. The number of transistors used is less, such that the occupied area is small, thereby facilitating realization of a high-resolution display device.