Oxide TFT Protrusion Structure for Threshold-Stable Display Pixels
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Solution Overview
Problem
Display devices experience changes in transistor threshold voltage due to the photoelectric effect, leading to inconsistent performance under varying light conditions.
Innovation Solution
Incorporation of protrusions on the upper surfaces of semiconductor layers and gate electrodes in transistors to diffuse light, preventing direct infiltration and stabilizing the threshold voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light is allowed to reach the transistor channel area, then the display device can operate normally under various lighting conditions, but the threshold voltage of the transistor changes due to the photoelectric effect
Solution Approach 1:
The channel area is divided into multiple protrusions, creating segmented surfaces that reduce the photoelectric effect. Each protrusion acts as an independent unit that limits the exposure area to light, thereby reducing the cumulative photoelectric effect while maintaining transistor functionality under various lighting conditions.
Solution Approach 2:
The channel area is transformed from a flat two-dimensional surface to a three-dimensional structure with protrusions. This dimensional change increases the surface area and creates shadow regions that block light from directly reaching certain areas, thereby reducing the photoelectric effect while maintaining electrical conductivity.
2Reliability
If protrusions are added to the channel area to reduce the photoelectric effect, then threshold voltage stability improves, but device complexity increases
Solution Approach 1:
The channel area is segmented into multiple protrusions that can be formed using standard photolithography and etching processes. This segmentation approach maintains manufacturing simplicity while achieving the goal of reducing the photoelectric effect through increased surface area and shadowing effects.
Solution Approach 2:
The protrusions are formed with curved or rounded surfaces rather than sharp edges, which can be achieved through conventional chemical etching processes. This curvature design maintains manufacturing simplicity while effectively reducing light reflection and photoelectric effect compared to flat surfaces.
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
The protrusions enhance the reliability and performance of display devices by maintaining consistent transistor behavior under different light conditions, improving optical and electrical stability.
Implementation Method 1
Incorporation of protrusions on the upper surfaces of semiconductor layers and gate electrodes in transistors to diffuse light, preventing direct infiltration and stabilizing the threshold voltage
Data Source
AI summary
A display device includes a light-emitting element including an anode and a cathode, a first transistor electrically connected between the anode and a first power line and switched by a voltage of a node, a second transistor electrically connected between the first transistor and a data line and switched by a write scan signal, and a third transistor electrically connected between the node and the anode and switched by a compensation scan signal. The third transistor includes an oxide semiconductor layer including a source area, a drain area, and a channel area disposed between the source area and the drain area, and a gate electrode disposed on the channel area. An upper surface of each of the source area, the drain area, and the channel area includes a plurality of first protrusions.