OLED Panel Vertical Transistor Stacking for High Resolution
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Solution Overview
Problem
The existing organic light emitting display apparatus faces challenges with image uniformity and reliability due to spatial restrictions caused by compensation circuits, leading to reduced storage capacitor area, deteriorated transistor performance, and increased process defects, especially at high resolutions.
Innovation Solution
The solution involves providing switching and driving transistors on separate layers, with a top gate type structure, and forming a storage capacitor between the driving transistor's gate and anode, which allows for increased storage capacitance and improved sensing sensitivity, reducing the need for additional contact holes and simplifying the pixel driver arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation circuit is added to improve image uniformity and reliability, then image quality improves, but the pixel driver area increases and spatial restriction occurs
Solution Approach 1:
The patent applies layer stacking to arrange transistors in different three-dimensional spaces. The sensing transistor is placed on a first substrate while the driving transistor is placed on a second substrate above it, utilizing the vertical dimension to resolve the area conflict. This allows both transistors to coexist without increasing the planar area, thereby maintaining image uniformity through the compensation circuit while avoiding spatial restriction in the pixel driver area.
2Area of stationary object
If the pixel driver area is reduced for high resolution, then spatial restriction is reduced, but the storage capacitor area is reduced and transistor performance deteriorates
Solution Approach 1:
By stacking transistors on different substrates in the vertical dimension, the patent enables high-resolution displays with smaller pixel driver areas while maintaining adequate storage capacitor area and transistor performance. The three-dimensional arrangement provides sufficient space for capacitor formation without compromising the performance of the driving or sensing transistors.
3Adaptability or versatility
If additional contact holes are created for the compensation circuit, then the circuit functionality is improved, but process defects increase
Solution Approach 1:
The patent reduces the number of contact holes required by utilizing vertical stacking. The sensing transistor on the first substrate and driving transistor on the second substrate can share common conductive structures and electrodes, eliminating the need for numerous additional contact holes through the intermediate layers. This maintains full compensation circuit functionality while significantly reducing process complexity and defect rates.
Data Source
AI summary
An organic light emitting display panel and an organic light emitting display apparatus using the same are disclosed, in which a switching transistor and a driving transistor are provided on their respective layers different from each other. To this end, the organic light emitting display panel comprises a substrate partitioned by a plurality of pixels, a driving transistor provided in a first pixel of the pixels and provided on the substrate in a top gate type, a first insulating film for covering the driving transistor, a switching transistor provided on the first insulating film in a top gate type, a second insulating film for covering the first insulating film and the switching transistor, a planarization film provided on the second insulating film, and an organic light emitting diode provided on the planarization film and connected with a driving first conductor of the driving transistor.