Transfer Pad Contact Structure for Small-Pixel Display Electrodes
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Solution Overview
Problem
Current display devices face challenges in improving electron transfer between the pixel electrode and the drain, leading to increased resistance and suboptimal display quality, particularly in high-resolution and small-pixel displays.
Innovation Solution
The implementation of a display device configuration that includes a thin film transistor, a transfer pad, and a pixel electrode, where the transfer pad is electrically connected to the drain through a first opening in a first insulating layer, increasing the contact area between the pixel electrode and the transfer pad, thereby enhancing electron transfer and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between pixel electrode and drain is increased, then electron transfer is improved and resistance is reduced, but device structure becomes more complex
Solution Approach 1:
The patent introduces a transfer pad as an intermediary component between the pixel electrode and the drain. This transfer pad increases the contact area and improves electron transfer by providing a larger interface for charge carrier movement, while maintaining a manageable structural complexity through its integration into the existing thin-film transistor architecture.
2Reliability
If the contact area between pixel electrode and transfer pad is increased, then resistance between pixel electrode and drain is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the vertical dimension by forming the transfer pad at a different layer level, allowing it to extend over the gate electrode. This three-dimensional arrangement increases the contact area between the pixel electrode and transfer pad without requiring higher precision in planar alignment, thus reducing resistance while maintaining manufacturability.
3Measurement precision
If display resolution is increased with smaller pixels, then display quality is improved, but electron transfer between pixel electrode and drain deteriorates
Solution Approach 1:
The transfer pad structure extends vertically over the gate electrode, creating additional contact area in the vertical dimension. This compensates for the reduced planar contact area in high-resolution displays with smaller pixels, maintaining effective electron transfer despite the smaller pixel dimensions and higher display resolution.
Data Source
AI summary
A display device, including a thin film transistor, a transfer pad, and a pixel electrode, is provided. The thin film transistor includes a drain. The transfer pad is electrically connected to the drain. The pixel electrode is electrically connected to the transfer pad through a first opening of a first insulating layer. The first insulating layer is disposed between the transfer pad and the pixel electrode. A width of the first opening is greater than a width of the drain. The width of the first opening is smaller than a width of the transfer pad. The display device of the disclosure can improve the electron transfer between the pixel electrode and the drain.