Nitride-Based TFT Substrate for High-Resolution Displays
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Solution Overview
Problem
The increasing demand for high-resolution display devices with higher pixel density requires thin film transistors with enhanced carrier mobility to manage shorter gate signal times, while maintaining product reliability and enabling smooth moving picture playback.
Innovation Solution
A thin film transistor substrate featuring a nitride-based semiconductor channel layer, source and drain electrodes, a gate electrode, and a depletion forming layer, which together enhance carrier mobility and support high-resolution display panels and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels per unit area is increased to achieve high-resolution display, then the resolution is improved, but the gate on time is shortened which requires higher carrier mobility
Solution Approach 1:
The patent changes the material parameter of the channel layer from conventional semiconductor materials to nitride-based semiconductor materials, which inherently possess higher carrier mobility. This material parameter change enables the transistor to operate effectively with the reduced gate on time caused by higher pixel density, thus resolving the contradiction between resolution improvement and gate signal timing.
2Productivity
If the driving frequency is increased to enable smooth moving picture playback, then the frame rate is improved, but the gate on time is further shortened requiring even higher carrier mobility
Solution Approach 1:
By changing the material parameter to nitride-based semiconductor with inherently higher carrier mobility, the patent enables the transistor to respond faster to gate signals. This allows the display to operate at higher driving frequencies for smooth moving picture playback without suffering from insufficient gate on time, thus resolving the contradiction between frame rate improvement and gate signal timing.
3Ease of manufacture
If conventional semiconductor materials are used in the channel layer, then the manufacturing process is simpler, but the carrier mobility is insufficient for high-resolution displays
Solution Approach 1:
The patent changes the material parameter from conventional semiconductor to nitride-based semiconductor, accepting the increased manufacturing complexity as a trade-off for achieving the required carrier mobility. The use of nitride-based materials provides the necessary electrical performance for high-resolution displays, resolving the contradiction between manufacturing simplicity and carrier mobility requirements.
Data Source
AI summary
A thin film transistor substrate according to an embodiment includes: a substrate; and a thin film transistor disposed on the substrate, wherein the thin film transistor includes a channel layer including a nitride-based semiconductor layer, a source electrode electrically connected to a first region of the channel layer, a drain electrode electrically connected to a second region of the channel layer, a gate electrode disposed on the channel layer, and a depletion forming layer disposed between the channel layer and the gate electrode.