OLED Pixel Circuit Routing to Reduce Horizontal Line Defects
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Solution Overview
Problem
The resistance in the compensation voltage transfer route of organic light emitting devices can cause horizontal line defects, such as horizontal stains, due to overlapping compensation voltage transfer routes with other wires, leading to improper transmission of compensation voltage.
Innovation Solution
The display device design includes a light emitting diode connected between a driving voltage line and a common voltage line, with a driving transistor and a second transistor connected to a data line, and a third transistor connected between the driving transistor and a gate electrode, where the contact portion of the connection electrode does not overlap the first scan line, reducing resistance and enabling smooth voltage transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compensation voltage transfer route overlaps with other wires, then the device complexity is reduced, but the resistance increases causing horizontal line defects
Solution Approach 1:
The patent applies dimensionality change by routing the compensation voltage transfer route (third transistor and connection electrode) in a different spatial arrangement that avoids overlapping with the first scan line. Specifically, the third transistor is positioned and connected such that its channel and electrodes do not intersect with the scan line path, effectively using spatial separation to resolve the contradiction between layout compactness and voltage transmission reliability.
2Area of stationary object
If the contact portion overlaps the first scan line, then the area is minimized, but the resistance increases causing improper voltage transmission
Solution Approach 1:
The patent segments the pixel structure by carefully separating the compensation voltage transfer route (third transistor and connection electrode) from the scan line route. This segmentation allows the contact portion to be positioned such that it does not overlap with the first scan line, thereby maintaining voltage transmission precision while minimizing area through optimized spatial arrangement of the separated components.
3Reliability
If the third transistor and connection electrode are positioned to avoid overlap with the first scan line, then the resistance is reduced improving voltage transmission, but the device complexity increases
Solution Approach 1:
The patent merges the third transistor and connection electrode into a integrated compensation voltage transfer route that is strategically positioned within the pixel structure. By combining these elements and positioning them to avoid scan line overlap, the design achieves reliable voltage transmission while managing layout complexity through unified routing rather than separate independent components.
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 resistance in the compensation voltage transfer route, thereby minimizing horizontal line defects and ensuring proper voltage transmission, improving display quality.
Implementation Method 1
electrons injected from one electrode are combined with holes injected from the other electrode in an organic emission layer to form excitons. The excitons output energy and emit light when they transition from an excited state to a ground state.
Data Source
AI summary
A display device includes a light emitting diode electrically connected between a driving voltage line and a common voltage line; a driving transistor electrically connected between the driving voltage line and the light emitting diode; a second transistor electrically connected between a first electrode of the driving transistor electrically connected to the driving voltage line and a data line; a first scan line electrically connected to a gate electrode of the second transistor; a third transistor electrically connected between a second electrode of the driving transistor electrically connected to the light emitting diode and a gate electrode of the driving transistor; and a connection electrode that connects the gate electrode of the driving transistor and the third transistor, wherein at least a part of a contact portion where the connection electrode contacts the third transistor does not overlap the first scan line.