OLED Auxiliary Electrode for Voltage Uniformity
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Solution Overview
Problem
In OLED displays, the uniformity of voltage resistance across the transparent electrode is compromised due to its thin formation, leading to potential voltage drops and reduced aperture ratio due to the need for additional auxiliary electrodes.
Innovation Solution
An auxiliary electrode is introduced in the non-subpixel area, connected to the second electrode, applying a voltage to enhance resistance uniformity without additional photolithography processes, and is strategically placed between subpixels to minimize space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transparent electrode is formed thinly to increase light transmittance, then light transmittance is improved, but resistance uniformity deteriorates causing voltage drop
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary element in the non-subpixel area to mediate the voltage distribution. This auxiliary electrode connects to the second electrode and provides additional voltage support, acting as a mediator to compensate for the insufficient voltage uniformity caused by the thin transparent electrode structure.
2Reliability
If additional auxiliary electrodes are provided outside each pixel to overcome voltage drop, then resistance uniformity is improved, but aperture ratio is reduced
Solution Approach 1:
The auxiliary electrode is strategically placed only in the non-subpixel area, creating a local solution rather than a global one. This localized approach provides voltage compensation exactly where needed (in the non-emitting region) while leaving the subpixel areas untouched, thereby maintaining high aperture ratio.
Solution Approach 2:
The solution moves from a two-dimensional plane constraint by utilizing the non-subpixel area dimension. By placing the auxiliary electrode in the non-emitting region (a different functional dimension), the patent avoids occupying space in the light-emitting dimension, thus maintaining aperture ratio while achieving voltage uniformity.
3Reliability
If additional auxiliary electrodes are added to the structure, then resistance uniformity is improved, but device complexity increases
Solution Approach 1:
The auxiliary electrode is merged with the existing electrode structure in the non-subpixel area. Rather than being a completely separate component, it integrates with the second electrode system, sharing common connections and voltage supply, thereby reducing overall structural complexity while still providing the necessary voltage compensation function.
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 improves voltage resistance uniformity and maintains a high aperture ratio by applying auxiliary voltage to the second electrode, preventing voltage drops and maximizing display efficiency without requiring extra space or processes.
Implementation Method 1
An auxiliary electrode is arranged in the second area of the non-subpixel area and is connected to the second electrode. The auxiliary electrode applies auxiliary voltage to the second electrode.
Data Source
AI summary
The present invention provides an organic light emitting display (OLED). The OLED includes a substrate, a first electrode arranged on a subpixel area of the substrate, an organic light emitting layer arranged on the first electrode, and a second electrode arranged on the organic light emitting layer, which extends to a non-subpixel area. An auxiliary electrode that is connected to the second electrode is arranged on the substrate, thereby the auxiliary electrode applies a same voltage as that of the second electrode.