Display Pixel Circuits With Extension Electrodes for Stable Images
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Solution Overview
Problem
Rapid variation in data voltages can affect the first power lines adjacent to data lines, causing variations in the level of the first voltage, which can lead to improper image display in display devices.
Innovation Solution
The display device incorporates a first pixel circuit, a second pixel circuit, a third pixel circuit, a light emitting element, and an extension electrode, with each pixel circuit including specific transistors and capacitors connected to constant voltage lines and power lines in a configured manner to stabilize the first voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data voltages are rapidly varied to enable fast image updates, then image refresh speed is improved, but the first power line voltage level varies causing display errors
Solution Approach 1:
An extension electrode is introduced as an intermediary component between the capacitor and the first power line. This extension electrode acts as a shield that blocks the electromagnetic coupling between the data line and the first power line, preventing the rapid data voltage variations from affecting the power line voltage level, thus maintaining display accuracy during fast image updates
Solution Approach 2:
The harmful electromagnetic coupling effect is extracted and isolated by positioning the extension electrode specifically between the data line and the first power line. This extraction of the interference path allows the data voltages to be rapidly varied for fast refresh while the extension electrode removes the harmful coupling effect that would otherwise cause voltage level variations in the first power line
2Area of stationary object
If the first power line is positioned adjacent to data lines for compact layout, then device area is reduced, but voltage level variation occurs affecting image display
Solution Approach 1:
The extension electrode serves as a protective intermediary positioned between the first power line and the data lines. This intermediary structure enables the first power line to be placed adjacent to data lines for compact layout while simultaneously blocking the harmful electromagnetic coupling, thus preventing voltage level variations even in the compact configuration
Solution Approach 2:
The extension electrode provides localized electromagnetic shielding specifically at the critical interface between the first power line and data lines. This local quality enhancement allows the power line to be positioned close to data lines for area reduction while the localized shielding prevents voltage variation only where the coupling would occur, maintaining display quality in the compact layout
Data Source
AI summary
A display device includes: first to third pixel circuits, each of which includes a first transistor including a first electrode connected to a first power line, a second electrode connected to the light emitting element, and a control electrode connected to a node, a second transistor including a first electrode connected to a data line, a second electrode connected to the first transistor's first electrode, and a control electrode connected to a write scan line, and a capacitor including a first electrode connected to a constant voltage line and a second electrode connected to the node. The constant voltage line is disposed between the second and third pixel circuits. An extension electrode of the display device is connected to the first electrode of the capacitor of each of the second and third pixel circuits, extends between the second and third pixel circuits, and is connected to the constant voltage line.