Wafer-Based Pixel Unit Structure for High-Mobility Transistors
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Solution Overview
Problem
Existing display devices face challenges with high manufacturing costs, complex processes, and low yield rates due to the limitations of glass substrates, which restrict the size and performance of thin-film transistors, especially in large-sized panels.
Innovation Solution
A pixel unit structure comprising a display medium module with separate electrodes and an active switching element, where the active switching element is manufactured on a wafer and assembled independently, allowing for higher processing temperatures and improved transistor characteristics, and enabling easier assembly and replacement of individual pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin-film transistors are manufactured directly on glass substrate, then manufacturing process is simple, but transistor mobility is low and device size must be large
Solution Approach 1:
The invention divides the transistor manufacturing process into two independent parts: (1) manufacturing the transistor on a separate semiconductor substrate (wafer) where high-mobility devices can be created, and (2) separately manufacturing the display medium module on glass substrate, then assembling them together. This segmentation allows each component to be optimized independently, resolving the contradiction between manufacturing simplicity and transistor performance.
Solution Approach 2:
The invention introduces a semiconductor substrate (wafer) as an intermediary carrier for the transistor. This intermediary allows the transistor to be manufactured under optimal conditions on the wafer, then transferred to the final display device, thereby achieving high mobility without requiring direct manufacturing on the glass substrate.
2Area of stationary object
If glass substrate size is increased for large panels, then display area is larger, but manufacturing cost increases and yield rate decreases
Solution Approach 1:
The invention segments the manufacturing process so that small, high-yield transistor wafers can be manufactured separately and then assembled onto large glass substrates. This allows the display panel to be large while the critical transistor manufacturing remains on small, manageable wafers with high yield rates, resolving the contradiction between panel size and manufacturing yield.
3Area of stationary object
If glass substrate size is increased for large panels, then display area is larger, but manufacturing complexity and time increase
Solution Approach 1:
By segmenting the manufacturing into separate transistor fabrication on wafers and display medium assembly on glass substrates, the invention enables large panel production without proportionally increasing process complexity. Each segment can be manufactured independently using optimized processes, then assembled, thereby achieving large display area without excessive manufacturing complexity.
4Reliability
If thin-film transistor size is increased to compensate for low mobility, then charging ability is sufficient, but array dimensions become larger and harder to manufacture
Solution Approach 1:
The invention changes the material and structural parameters of the transistor by manufacturing it on a semiconductor wafer rather than directly on glass. This parameter change enables high mobility devices with smaller dimensions, achieving sufficient charging ability while maintaining manageable array sizes that are easier to manufacture.
Data Source
AI summary
A pixel unit structure, as well as a manufacturing method thereof, is provided. The pixel unit structure includes a display medium module and an active switching element. The display medium module includes a first electrode, a second electrode and a display medium. The first electrode and the second electrode are separated from each other, and the display medium is disposed between the first electrode and the second electrode. The active switching element is electrically connected to the first electrode, for allowing the first electrode and the second electrode to change the state of the display medium. The active switching element includes a wafer portion and a transistor portion, which is formed on the wafer portion. Therefore, the active switching element can be manufactured independently without the restriction from the display medium module.