Vertical OLED Transistor Lattice Wiring for Voltage Drop
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Solution Overview
Problem
Large displays using organic semiconductor elements face issues with voltage fluctuations in current supply lines, leading to decreased luminance and display defects due to increased resistance values, especially when enlarged, which complicates the configuration and requires additional circuitry that can hinder performance and reliability.
Innovation Solution
The display configuration includes vertical organic light-emitting transistors with current supply lines and auxiliary lines formed in a lattice shape, directly connected without contact holes, and an organic resin layer to reduce resistance and prevent leakage currents, ensuring a stable voltage supply and higher luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display is enlarged, then the display area is increased, but the resistance value of the wiring increases causing voltage drop and luminance decrease
Solution Approach 1:
The current supply lines are divided into multiple segments arranged in a lattice pattern, with each segment connecting to multiple vertical organic light-emitting transistors. This segmentation reduces the length of individual wiring segments, thereby reducing resistance and voltage drop while maintaining coverage of the entire enlarged display area.
Solution Approach 2:
The current supply lines are extended into a third dimension by forming them at different heights (first height and second height) above the substrate. This vertical stacking creates a lattice structure that reduces the horizontal distance current must travel, thereby reducing resistance and voltage drop across the enlarged display area.
2Reliability
If additional circuitry is added to compensate for voltage drop, then voltage stability is improved, but the device complexity increases
Solution Approach 1:
Multiple current supply lines are merged into a lattice structure where they intersect and connect at various points. This merging creates redundant pathways for current flow, ensuring voltage stability without requiring additional complex control circuitry, as the lattice structure itself provides the compensation through its geometry.
Solution Approach 2:
The lattice-shaped current supply lines serve multiple functions simultaneously: they provide current supply, act as structural support, and inherently compensate for voltage drop through their geometric configuration. This multi-functionality eliminates the need for separate compensation circuits, reducing overall device complexity.
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 reduces voltage fluctuations in current supply lines, preventing display defects and maintaining high luminance, even in larger displays, by minimizing resistance and preventing unintended light emission and leakage currents.
Implementation Method 1
The display configuration includes vertical organic light-emitting transistors with current supply lines and auxiliary lines formed in a lattice shape, directly connected without contact holes, and an organic resin layer to reduce resistance and prevent leakage currents
Implementation Method 2
the transistor emitting light in accordance with an amount of the current flowing through the transistor itself
Data Source
AI summary
A liquid crystal display device includes: a substrate; a plurality of vertical organic light-emitting transistors; a data line that supplies a voltage to a gate electrode of the vertical organic light-emitting transistor; a thin-film transistor that is connected between the gate electrode of each of the vertical organic light-emitting transistors and the data line and controls supply of the voltage to the gate electrode of the vertical organic light-emitting transistor; a gate line that is connected to the gate electrode of the thin-film transistor and transmits a signal for switching the thin-film transistor; and a plurality of current supply lines that are wired in a first direction outside a formation region of the vertical organic light-emitting transistor, the current supply lines being in contact with a source electrode of the vertical organic light-emitting transistor to supply a current to the vertical organic light-emitting transistor.