Overview of Thin-Film Transistor Technology

In modern active‑matrix display panels, Thin-Film Transistor (TFT) It is the core component that drives the display. Its channel active region is typically made of silicon, and based on differences in manufacturing processes and performance, TFTs are broadly classified into three main types: amorphous silicon (a-Si), low‑temperature poly‑silicon (LTPS), and high‑temperature poly‑silicon (HTPS). Among these, Low-Temperature Polycrystalline Silicon (LTPS) Technology Thanks to its outstanding electron mobility, low power consumption, and high resolution, coupled with a relatively simple manufacturing process, it has become the mainstream choice for Gen 6 and lower-generation production lines.

In-depth Analysis of LTPS-TFT Structural Design

The typical LDD (Lightly Doped Drain)‑type LTPS‑TFT structure consists primarily of a substrate and a buffer layer. The substrate is usually an alkali‑free, display‑grade optical glass, upon which a single layer of silicon dioxide (SiO₂) or a bilayer SiO₂/SiNx buffer is deposited. The key function of this structure is: Preventing the diffusion of metal ions from the glass into the polycrystalline silicon active region. , thereby suppressing defect formation and leakage current.

Compared with pure SiO₂, SiNx (silicon nitride) has a higher dielectric constant—approximately 4 for SiO₂ and 6–8 for SiNx—and exhibits superior breakdown resistance, excellent barrier properties, and the ability to undergo oxidative repair. Silicon nitride prepared via the PE‑CVD process can achieve an oxygen concentration of about 10²² cm⁻³, thereby ensuring device stability.

In the polycrystallization process, the amorphous silicon layer must be converted into a polycrystalline silicon layer. Common methods include solid-phase crystallization, metal-induced lateral crystallization (such as nickel‑induced crystallization), and laser crystallization. Among these, laser crystallization achieves crystallization through transient high‑temperature melting, offering high efficiency and uniform grain sizes. However, it should be noted that if a SiO₂/SiNx bilayer is used as the buffer layer, certain issues may arise during laser crystallization. Hydrogen embrittlement phenomenon , leading to defects. Solutions include performing a dehydrogenation bake prior to laser crystallization, or selecting a single-layer SiO₂ structure with extremely low hydrogen content.

LDD technology This is achieved by performing low‑dose ion implantation in the source and drain regions on the inner side of the gate, precisely controlling the dopant concentration to form a high‑series‑resistance concentration buffer region. This effectively reduces the local electric field gradient, suppresses leakage current, and mitigates hot‑carrier effects.

Industrial Applications and Professional Display Solutions

As display technology continues to evolve toward higher resolution, lower power consumption, and greater thinness and lightness, LTPS-TFT It has become an important technological pathway for mid- to high-end display panels. In the actual implementation of products, Overall design and manufacturing capabilities of display modules Equally crucial.

In this field, CNK Electronics (abbreviated as CNK) As a company specializing in the integrated development, manufacturing, and sales of display devices and HMI human-machine interaction products, Specialized, Specialized and Novel Enterprise It possesses end-to-end capabilities, spanning from R&D to mass production and delivery. Its key product offerings include monochrome LCDs and modules, TFT display modules ranging from 0.96 to 15.6 inches, OLED modules, and HMI human-machine interface modules, which are widely deployed across diverse sectors such as industrial control, smart home applications, medical devices, and automotive displays.

Whether it is Liquid crystal display (LCD screen) Whether it’s basic display requirements or high performance LCD display manufacturers CNK can provide customized, cost-effective solutions for high‑reliability TFT modules. Backed by state-of-the-art production lines and a rigorous quality‑control system, the company consistently delivers stable, reliable display core components to its customers.

Conclusion

From the LTPS technology at the heart of TFTs to the integration and optimization of complete display modules, every advancement in the display industry hinges on the collaborative innovation of materials, processes, and design capabilities. CNK Electronics will continue to deepen its expertise in displays and human–machine interaction, helping more end products deliver clearer, smarter display experiences.

About CNK

CNK Electronics, founded in Shenzhen in 2010 and expanding its investment in Wuping, Fujian in 2019, is a nationally recognized “Little Giant” enterprise specializing in the design, development, manufacturing, and sales of display devices. The company is committed to seamlessly integrating smart technology with display innovation, offering customers worldwide a comprehensive portfolio of high‑quality, cost‑effective small- and medium‑size displays, along with tailored solutions and services. Guided by technological advancement and underpinned by uncompromising quality, CNK adheres to the principles of sustainable development, striving to become a leading innovator in the display industry and delivering superior, reliable, and rapid service to its clients.