OLED Carbon Nanotube Electrode IR Drop and Shock Resistance
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Solution Overview
Problem
Organic light emitting display (OLED) apparatuses face issues with current-resistance (IR) drop, leading to increased power consumption and non-uniform image quality as the device size increases, and are prone to damage from external shocks due to their thin film structure.
Innovation Solution
Incorporating a conductive component made of carbon nano-tubes on the second electrode, which can have transmittance between 30% and 99% in visible rays, to reduce electrical resistance and enhance shock resistance by forming a durable and flexible layer that covers the second electrode and can contact a sealing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If electrode thickness is reduced to improve transmission of visible rays, then transmittance is improved, but electrical resistance increases causing IR drop
Solution Approach 1:
The patent combines thin-film electrode material with carbon nanotube conductive material to create a composite structure. The thin electrode layer (first sub-electrode) provides high transmittance, while the carbon nanotube layer (second sub-electrode) provides low electrical resistance, resolving the contradiction between transmittance and electrical resistance
Solution Approach 2:
The patent transitions from a single-layer electrode to a multi-layer electrode structure with vertical stacking. By adding the carbon nanotube layer in another dimension (vertical layering), the patent achieves both high transmittance (from the thin first layer) and low resistance (from the conductive second layer) simultaneously
2Area of stationary object
If OLED apparatus size is increased, then display area is improved, but IR drop becomes more significant
Solution Approach 1:
The carbon nanotube-based composite electrode structure provides uniformly low electrical resistance across large areas, enabling increased display area without proportionally increasing power consumption. The high conductivity of carbon nanotubes compensates for the increased path length in larger devices
3Length of moving object
If thin-film structure is used to reduce overall thickness, then device thickness is reduced, but shock resistance deteriorates
Solution Approach 1:
The patent employs a flexible thin-film electrode structure that can deform under external shock without breaking. The carbon nanotube layer provides flexibility and shock absorption capability, allowing the thin-film structure to maintain both thinness and shock resistance
Solution Approach 2:
The composite structure of thin-film electrode and carbon nanotube layer creates a material that is both thin and mechanically robust. The carbon nanotubes provide structural reinforcement that enhances shock resistance while maintaining the overall thin profile of the device
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
The carbon nano-tube conductive component effectively reduces IR drop, minimizing power consumption and improving image quality while providing enhanced durability against shocks, maintaining brightness and pixel characteristics.
Implementation Method 1
a conductive component disposed on the second electrode. The conductive component comprises carbon nano-tubes
Implementation Method 2
having an organic light emitting device with improved shock resistance
Data Source
AI summary
Provided is an organic light emitting apparatus that prevents voltage drop due to thin electrode and improves shock resistance. The organic light emitting apparatus includes a substrate, a first electrode formed on the substrate, an organic light emitting layer formed on the first electrode, a second electrode formed on the organic light emitting layer, and a conductive component disposed on the second electrode. The conductive component includes carbon nano-tubes.