Planar Power Signal Electrode for AMOLED Voltage Drop Reduction
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Solution Overview
Problem
In active matrix organic light-emitting diode (AMOLED) displays, the thin and long VDD wires cause significant voltage drops, leading to non-uniform display brightness due to variations in driving voltage among pixels.
Innovation Solution
An active matrix organic light-emitting diode display substrate with a power signal structure featuring a planar power signal electrode reduces resistance and voltage drop, ensuring uniformity in display brightness by providing a power signal electrode in a separate layer and optionally connecting it in parallel with a power signal connection line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If VDD wires are made thin to reduce area occupation, then area usage is improved, but voltage drop increases causing non-uniform display brightness
Solution Approach 1:
The patent transitions from traditional linear VDD wire routing to a planar power signal electrode structure that distributes power in two dimensions across the substrate. This dimensional change allows comprehensive power delivery to all pixel structures without requiring long thin wires, thereby reducing voltage drop while maintaining area efficiency.
Solution Approach 2:
The power signal electrode is divided into multiple segments corresponding to different pixel structures. Each segment independently provides power to its associated pixel, ensuring uniform voltage distribution across the display panel and eliminating the voltage drop issues associated with long continuous wires.
2Length of stationary object
If VDD wires are made long to reach all pixels, then coverage is improved, but voltage drop increases due to resistance
Solution Approach 1:
The patent replaces long linear VDD wires with a planar power signal electrode structure that achieves comprehensive coverage through two-dimensional distribution. This approach provides full pixel coverage while minimizing resistance and voltage drop by creating short current paths through the planar geometry.
Solution Approach 2:
The planar power signal electrode acts as an intermediary between the power source and individual pixel structures. It distributes power uniformly across all pixels through its extended surface area, eliminating the need for long wire connections and reducing energy loss through resistance.
3Adaptability or versatility
If different VDD voltages are provided to different pixels, then individual pixel control is improved, but display uniformity deteriorates
Solution Approach 1:
The planar power signal electrode creates equipotential regions across the substrate, ensuring that all pixel structures receive the same VDD voltage. This uniform potential distribution maintains display brightness uniformity while still allowing individual pixel control through the thin film transistor switching mechanisms.
Data Source
AI summary
The present invention provides an active matrix organic light-emitting diode display substrate and a display device. The active matrix organic light-emitting diode display substrate comprises a substrate and a plurality of pixel structures arranged in a matrix on the substrate, and further comprises a power signal structure for providing a power signal to each pixel structure, wherein the power signal structure comprises one layer of power signal electrode having a planar structure. By designing the power signal structure to include a power signal electrode having a planar structure, resistance of the power signal structure is reduced, and accordingly voltage drop of VDD decreases, thus the difference in driving voltage among organic light-emitting diodes is relatively small, and uniformity of display brightness of a display panel is ensured.