Organic Light Emitting Display Device Opaque Metal Power Lines
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Solution Overview
Problem
The use of transparent conductive materials in organic light emitting display devices leads to voltage drops due to higher resistance, resulting in uneven brightness and image quality issues.
Innovation Solution
The implementation of an organic light emitting display device design where scan lines, data lines, and pixel power lines are formed with opaque metal materials, while the capacitor electrodes are made of transparent conductive materials, and the power supply line in non-display regions is formed with opaque metal materials to reduce voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive material is used for all electrodes and wires, then transparency of the display device is improved, but voltage drop increases due to higher resistance
Solution Approach 1:
The patent applies different material properties to different regions: transparent conductive material (TCO) is used for capacitor electrodes where transparency is critical, while opaque metal material is used for scan lines, data lines, and power supply lines where low resistance is critical. This local differentiation resolves the contradiction by optimizing each region for its primary function.
Solution Approach 2:
The patent employs a composite material strategy by combining two types of conductive materials (TCO and opaque metal) within the same device. Each material is selected for its superior properties: TCO for transparency and opaque metal for low resistance. This composite approach allows the device to achieve both transparency and reliable electrical performance.
2Reliability
If opaque metal material is used for power supply line, then voltage drop is reduced, but transparency in non-display region is compromised
Solution Approach 1:
The patent accepts reduced transparency in non-display regions (power supply line areas) as an acceptable trade-off, since these regions are not part of the active display area. Opaque metal is used for the power supply line to ensure low resistance and stable power delivery, while TCO is used for capacitor electrodes in the display region to maintain transparency. This local quality approach prioritizes functional performance in critical areas.
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 design enhances the uniformity of brightness and prevents voltage drops, allowing for a more efficient and transparent organic light emitting display device with improved image quality.
Implementation Method 1
an organic light emitting element electrically coupled to the thin transistor and disposed on the capacitor
Data Source
AI summary
An organic light emitting display device having a pixel unit including a plurality of scan lines, data lines and pixel power lines arranged in a matrix type and forming respective sub pixels in an intersection region of the plurality of scan lines, data lines and pixel power lines; a thin film transistor including a pad unit receiving signals to drive driving the respective sub pixels, a scan driver and a data driver supplying the signals to the plurality of scan lines and data lines through the pad unit, and non-pixel unit formed with a power supply line supplying power to the pixel powers line, the sub-pixel including an oxide semiconductor layer; a capacitor having a lower electrode and an upper electrode formed of a transparent conductive material; and an organic light emitting element electrically coupled to the thin transistor and disposed on the capacitor.