OLED Panel Contact Hole Placement for Storage Capacitor
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in achieving high luminance and high resolution while maintaining a sufficient storage capacitor capacity without increasing the non-light emitting area, and in preventing damage to the active and buffer layers during the manufacturing process.
Innovation Solution
The organic light emitting display panel is designed with a structure where the active layer does not overlap the contact holes, allowing for a reduced conductive layer size over the contact holes, increased storage capacitor capacity, and easy sub-pixel driving, while preventing layer damage through strategic contact hole placement and layer arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact holes overlap the active layer, then the conductive layer can be larger for better electrical connection, but the active layer or buffer layer may be damaged during the manufacturing process
Solution Approach 1:
The patent extracts the harmful overlap between contact holes and the active layer by positioning contact holes only over the buffer layer and insulating films, completely separating the electrical connection path from the active layer to eliminate damage risk while maintaining conductive layer integrity
Solution Approach 2:
The patent introduces the buffer layer and insulating films as intermediary layers between the contact holes and the active layer, creating a protective barrier that allows electrical connection without direct contact between contact holes and the active layer, thus preventing damage
2Quantity of substance
If the non-light emitting area is increased to accommodate storage capacitor, then the storage capacitor capacity is sufficient, but the light emitting area is reduced lowering luminance and resolution
Solution Approach 1:
The patent utilizes the vertical dimension by stacking multiple conductive layers (first conductive layer, second conductive layer, third conductive layer) at different heights connected through contact holes, enabling the storage capacitor to achieve sufficient capacity through vertical stacking rather than horizontal expansion, thus preserving the light emitting area
Solution Approach 2:
The patent implements a nested structure where contact holes are positioned to overlap multiple layers (buffer layer, first insulating film, second insulating film) vertically, allowing the conductive layers to be interconnected through the stacked configuration, maximizing space utilization within the non-light emitting area without expanding its footprint
Data Source
AI summary
An organic light emitting display panel and an organic light emitting display device including the display panel that includes a buffer layer disposed on a first conductive layer, and including a first contact hole overlapping a part of the first conductive layer, an active layer disposed on the buffer layer, a first insulating film disposed on the active layer and the buffer layer, and including a second contact hole overlapping the first contact hole, a second insulating film disposed over the first insulating film, and including a third contact hole overlapping a part of each of the first contact hole and the second contact hole, and a third conductive layer disposed on the second insulating film, and contacting a part of the second conductive layer through the second contact hole. The third contact hole does not overlap with the active layer. The organic light emitting display panel including a high-capacity storage capacitor and the organic light emitting display device including the display panel can be provided.