Array Substrate TFT Structure for Lower Turn-On Voltage
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Solution Overview
Problem
Conventional liquid crystal display panels consume excessive power due to the high turn-on voltage required for thin-film transistors, leading to increased energy consumption.
Innovation Solution
An array substrate and display panel design incorporating a thin-film transistor with a quasi-ohmic contact layer and a photosensitive semiconductor layer, which reduces the turn-on voltage by utilizing current hysteresis under illumination conditions, allowing control of the transistor's logic state with applied voltage and light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional thin-film transistor structure is used, then the transistor can be manufactured with standard processes, but the turn-on voltage is high resulting in high power consumption
Solution Approach 1:
The patent changes the electrical parameters of the transistor by introducing a photosensitive semiconductor layer and quasi-ohmic contact layer. The photosensitive layer modifies the current-voltage characteristics to reduce turn-on voltage, while the quasi-ohmic contact layer optimizes charge carrier injection. These parameter changes enable the transistor to operate at lower voltages while maintaining stable switching behavior.
Solution Approach 2:
The patent employs a composite structure combining photosensitive semiconductor material with conventional transistor materials. The photosensitive semiconductor layer is integrated with the active layer, and the quasi-ohmic contact layer is positioned between the metal contact and the active layer. This composite material approach enables simultaneous achievement of low turn-on voltage and stable operation.
2Reliability
If the turn-on voltage of the gate is increased to ensure reliable transistor switching, then switching reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent introduces a quasi-ohmic contact layer as an intermediary between the metal contact and the active layer. This intermediate layer facilitates smoother charge carrier injection and reduces the voltage required for reliable switching. The photosensitive semiconductor layer acts as another intermediary that modulates the electrical characteristics, enabling reliable switching at lower voltages by mediating the electrical interaction between components.
Solution Approach 2:
The patent modifies the electrical parameters through the photosensitive semiconductor layer, which changes the current-voltage relationship of the transistor. Under illumination, the photosensitive layer reduces the effective turn-on voltage while maintaining sufficient on-current for reliable switching. This parameter transformation allows the transistor to achieve reliable operation at lower gate voltages, reducing power consumption.
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 design effectively reduces the turn-on voltage of the thin-film transistor, thereby decreasing power consumption in the display panel.
Implementation Method 1
a photosensitive semiconductor layer disposed on the side of the active layer away from the gate, wherein the photosensitive semiconductor layer is respectively electrically connected to the source and the quasi-ohmic contact layer
Implementation Method 2
Through utilizing a current hysteresis under a forward bias condition in a current-voltage characteristic of the Schottky diode under an illumination condition
Data Source
AI summary
An array substrate and a display panel are provided. The array substrate includes a base and a thin-film transistor disposed on a side of the base, and a turn-on voltage of a gate of the thin-film transistor can be reduced by a sensing effect of the thin-film transistor on external or internal light, so that power consumption of the display panel can be reduced.