Light Emitting Display Device Signal Interference Reduction
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Solution Overview
Problem
High-resolution light emitting display devices require a large number of signal lines, leading to potential signal interference due to inadequate spacing between lines, which affects the proper functioning of the pixels.
Innovation Solution
The implementation of a light emitting display device with a specific configuration including switches, capacitors, and power lines, where scan and data signals are applied in specific periods to manage voltage levels and minimize interference, allowing for efficient pixel operation with reduced line requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of signal lines are used to drive high-resolution display, then the display resolution is improved, but signal interference between adjacent lines increases
Solution Approach 1:
The patent applies preliminary action by initializing the pixel circuit nodes to known voltage states before the actual data signal is applied. The first node is initialized to a first voltage level and the second node to a second voltage level through dedicated initialization switches and signal lines, ensuring that the nodes are in a known state before the main data writing operation, thereby preventing signal interference and ensuring accurate data storage
Solution Approach 2:
The patent segments the pixel circuit into distinct functional blocks with separate switches and nodes. Each pixel includes first and second switches connected to first and second nodes, with dedicated initialization switches and data switches. This segmentation isolates the signal paths and allows independent control of each node, reducing cross-talk and signal interference between adjacent pixels and lines
2Measurement precision
If a large number of signal lines are used to maintain high resolution, then the pixel density is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements multi-functionality by using the same switch and node configuration for both initialization and data storage operations. The first and second switches, along with their connected nodes, serve dual purposes: initializing the pixel state and subsequently storing data signals. This reduces the total number of dedicated signal lines needed while maintaining high pixel density, thereby easing manufacturing precision requirements
3Adaptability or versatility
If conventional pixel circuits are used with multiple switches, then the display functionality is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic action by using time-multiplexed operations where the initialization switches and data switches are activated in specific time sequences. The initialization phase occurs before the data writing phase, and both phases are controlled by timing signals that coordinate the switching actions. This periodic control ensures that each switch operates only when needed, minimizing leakage current and reducing overall power consumption while maintaining full display functionality
Data Source
AI summary
A light emitting display device includes: a first switch connected between a data line and a first node and including a gate connected to a first scan line; a second switch connected between a first driving power line and a second node and including a gate electrode connected to the first node; a first capacitor connected between the first node and the second node; a light emitting element connected between the second node and a second driving power line; a scan driver applying a first A-scan signal and a first B-scan signal during different times to the first scan line; a data driver applying a first initialization signal and a data signal to the data line at different times; and a power supply portion applying a first driving voltage, a second driving voltage, and a third driving voltage to the first driving power line at different times.