Anode Voltage Line Layout for Black-Grayscale OLED Stability
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Solution Overview
Problem
Existing display devices face challenges in achieving improved screen quality and reliability, particularly in maintaining stable voltage levels for anode electrodes to prevent unintended light emission during black grayscale rendering.
Innovation Solution
The display device incorporates a first voltage line with a specific width configuration overlapping the anode electrode and an insulating layer, along with capacitors to stabilize anode electrode voltage, and includes transistors and voltage lines to manage initialization and data voltages effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voltage line configuration is used, then the device structure is simple, but the anode electrode voltage is unstable causing unintended light emission during black grayscale rendering
Solution Approach 1:
The voltage line has different widths at different locations: a first width at the first location (overlapping the anode electrode) and a second width at the second location (not overlapping the anode electrode), where the first width is greater than the second width. This local variation in geometry allows the voltage line to provide different electrical characteristics at different positions, specifically increasing capacitance near the anode electrode to stabilize its voltage during black grayscale rendering.
Solution Approach 2:
The patent changes the geometric parameter (width) of the voltage line at different locations to achieve different electrical functions. By making the voltage line wider at the first location overlapping the anode electrode and narrower at the second location, the patent optimizes the voltage stabilization function while maintaining overall structural simplicity.
2Reliability
If the voltage line width is increased to stabilize anode electrode voltage, then voltage stability improves, but the overall device area increases
Solution Approach 1:
Instead of uniformly increasing the voltage line width across the entire structure, the patent applies local quality by increasing the width only at the specific first location where the voltage line overlaps with the anode electrode. The voltage line has a second width at the second location that is smaller than the first width, thereby providing voltage stabilization only where needed while minimizing the overall area occupation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration stabilizes anode electrode voltage, reduces unintended light emission during black grayscale, enhances screen reliability, and reduces power consumption.
Implementation Method 1
the anode electrode and the first voltage line may constitute a capacitor
Data Source
AI summary
A display device includes: a substrate; an anode electrode on the substrate; and a first voltage line between the substrate and the anode electrode and configured to receive a negative voltage, wherein in the first voltage line, a first portion overlapping the anode electrode has a width greater than a second portion not overlapping the anode electrode.