Overlapping Pixel Driving Circuits with Electric Field Blocking Layer
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Solution Overview
Problem
The challenge in display apparatus technology is to densely integrate thin film transistors in a limited area without causing congestion and ensuring high resolution, while also preventing electrical interference between overlapping transistors.
Innovation Solution
The solution involves a display apparatus design where pixel driving circuits overlap each other, with an electric field blocking layer of 1 μm or more thickness and a dielectric constant of 3.9 or less, made of a siloxane compound, to prevent electrical interference and allow for high-density integration of thin film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thin film transistors are highly integrated in a limited area to achieve high resolution, then display resolution is improved, but transistor congestion occurs and capacitor area is insufficient
Solution Approach 1:
The patent implements overlapping pixel driving circuits where circuits in different layers (first and second pixel driving circuits) are positioned vertically above each other. This three-dimensional stacking approach allows transistors to be arranged in multiple layers rather than confined to a single plane, effectively increasing the functional area without expanding the lateral footprint, thereby achieving high transistor integration density without congestion
2Area of stationary object
If pixel driving circuits are overlapped to increase transistor density, then area usage is optimized, but electrical interference between transistors occurs
Solution Approach 1:
The patent introduces an electric field blocking layer positioned between the first and second pixel driving circuits in the overlapping region. This intermediate layer acts as a mediator that shields transistors in one circuit from electric field interference generated by transistors in the other circuit, enabling safe vertical stacking without electrical interference
Solution Approach 2:
The patent specifies particular parameters for the electric field blocking layer: a thickness of 1 μm or more and a dielectric constant of 3.9 or less. By controlling these physical parameters, the blocking layer achieves sufficient electric field shielding capability while maintaining a compact structure that preserves area efficiency
3Reliability
If the electric field blocking layer thickness is increased to prevent interference, then electrical isolation is improved, but device area increases
Solution Approach 1:
The patent optimizes the electric field blocking layer by specifying a minimum thickness of 1 μm and a maximum dielectric constant of 3.9. These parameter constraints ensure sufficient electrical isolation between overlapping circuits while preventing excessive thickness that would increase device area, achieving a balanced design
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 enables the stable operation of a large number of thin film transistors in a small area, preventing electrical interference and allowing for high-resolution display performance without the need for additional contact holes, thus optimizing the area usage and reducing electrical interference.
Implementation Method 1
an electric field blocking layer on the first pixel driving circuit, a second pixel driving circuit on the electric field blocking layer
Data Source
AI summary
A display apparatus includes a first pixel driving circuit, an electric field blocking layer on the first pixel driving circuit, a second pixel driving circuit on the electric field blocking layer, and a first display element and a second display element on the second pixel driving circuit, wherein each of the first pixel driving circuit and the second pixel driving circuit includes at least one thin film transistor, the first pixel driving circuit overlaps the second pixel driving circuit, the first display element is connected with the first pixel driving circuit, and the second display element is connected with the second pixel driving circuit.