Organic Electroluminescence Display Wiring for Uniform Brightness
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Solution Overview
Problem
Conventional organic light emitting displays suffer from non-uniform emission brightness due to varying IR drops in power source wiring lines, which limits the width of these lines and increases the risk of shorts, thereby affecting yield and picture quality, especially in large panels.
Innovation Solution
The implementation of a coupling blocking wiring line between data lines and a mesh structure for the driving power source wiring line, allowing for maximized width and reduced voltage drops, while preventing coupling between adjacent data lines and minimizing the number of initializing power source wiring lines to reduce potential shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the width of the power source wiring line is increased to prevent IR drop, then the uniformity of emission brightness is improved, but the risk of short between wiring lines increases
Solution Approach 1:
A coupling blocking wiring line is introduced as an intermediary element between adjacent data lines to prevent electrical coupling. This mediator structure allows the power source wiring line to be widened for uniform brightness while preventing the harmful coupling effect between data lines through the blocking wiring line that acts as an electrical barrier.
Solution Approach 2:
The wiring structure is segmented into distinct functional components: power source wiring lines for voltage delivery, data lines for signal transmission, and coupling blocking wiring lines for isolation. This segmentation allows each component to be optimized independently - the power source wiring line can be widened for uniformity while the coupling blocking wiring line prevents shorts between data lines.
2Manufacturing precision
If the width of the power source wiring line is increased to reduce IR drop, then the picture quality is improved, but the manufacturing yield decreases due to increased short possibilities
Solution Approach 1:
The coupling blocking wiring line serves as a protective intermediary that prevents electrical shorts between adjacent data lines. This allows the power source wiring line to be widened for improved picture quality without increasing the risk of manufacturing defects, as the blocking wiring line isolates potential short circuits between data lines.
Solution Approach 2:
The coupling blocking wiring line is pre-formed during the manufacturing process to prevent potential shorts between data lines before they occur. This preliminary protective action ensures that when the power source wiring line is widened for better picture quality, the manufacturing yield is not compromised by short circuits.
3Area of stationary object
If data lines are arranged close together to reduce overall device size, then the area is reduced, but coupling between data lines increases
Solution Approach 1:
The coupling blocking wiring line is positioned between adjacent data lines to prevent electrical coupling. This intermediary structure enables data lines to be arranged close together for compact display area while the blocking wiring line eliminates the harmful coupling effect between the closely spaced data lines.
Solution Approach 2:
The coupling blocking wiring line provides localized isolation between specific adjacent data lines. This local quality enhancement allows tight packing of data lines for compact overall device size while maintaining electrical isolation where needed to prevent coupling between neighboring data lines.
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 solution ensures stable and uniform picture quality by minimizing IR drops and preventing data line coupling, allowing for increased width of power source wiring lines and improved yield by reducing the risk of shorts and foreign substance-induced errors during patterning.
Implementation Method 1
a coupling blocking wiring line between the data lines that of the pair
Implementation Method 2
The IR drop in the power source wiring line is less near a power supply source. Conversely, the IR drop in the power source wiring line remote from the power supply source is greater.
Data Source
AI summary
An organic light emitting display capable of substantially preventing IR drop of a power source wiring line and coupling of data lines is disclosed. In one aspect, the organic light emitting display includes pairs of data lines between adjacent sub-pixels. The data lines are arranged to run parallel with a coupling blocking wiring line provided between each pair.