Stage Circuit Layout for Uniform Scan Signal Distribution
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Solution Overview
Problem
Display devices experience luminance differences across horizontal lines due to variations in scan signal distribution, which affect image quality.
Innovation Solution
A stage circuit design that includes a controller, driver, connection portions, and a reset to manage voltage levels and electrical connections between nodes, using multiple power inputs to minimize luminance differences by controlling scan clock signals and enabling precise signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If scan signals are distributed across horizontal lines using conventional stage circuits, then scan driving function is achieved, but luminance differences occur across horizontal lines
Solution Approach 1:
The stage circuit is divided into multiple independent output units (first output unit, second output unit, etc.), each responsible for driving specific scan lines. Each output unit has its own transistor and capacitor configuration, allowing independent control of scan signals to different horizontal lines, thereby reducing luminance differences while maintaining manageable circuit complexity through modular segmentation.
Solution Approach 2:
Different output units are configured with different transistor types (first transistors with first threshold voltages, second transistors with second threshold voltages) and capacitor values tailored to their specific driving requirements. This local customization allows each output unit to optimize scan signal distribution for its designated horizontal lines, achieving uniform luminance across the display without requiring complete redesign of the entire stage circuit.
2Manufacturing precision
If multiple output units are added to reduce luminance differences, then display uniformity improves, but circuit complexity increases
Solution Approach 1:
The stage circuit employs a universal output unit structure that can be replicated for different horizontal lines. Each output unit uses the same basic configuration of transistor and capacitor, allowing the circuit to drive multiple scan lines with standardized components. This multi-functionality approach reduces overall complexity compared to custom-designed circuits for each output, while still achieving uniform luminance through systematic replication of the optimized unit structure.
Data Source
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AI summary
A stage circuit includes a controller connected to first and second powers, and configured to control a voltage of a connection control line in response to carry signals of first and second carry input terminals, a driver connected to the first power and to a third power, and configured to control voltages of first and second nodes, first outputs configured to receive one of scan clock signals or output enable scan signals based on a voltage of one of local nodes, connection portions configured to control an electrical connection between the local nodes and the first node in response to the voltage of the connection control line, and a reset connected between the connection control line and a fourth power, and configured to control an electrical connection between the connection control line and the fourth power based on the voltage of the second node.