News Center
Specializing in the development, manufacturing, and sales of display devices and HMI human-machine interface products.
Precision Alignment and Cell Formation: An Analysis of PI Coating and Rubbing Processes in LCD Manufacturing
Release Date:
2025-11-24 00:00
Source:
The complete manufacturing process of an LCD comprises more than 40 precision steps, which can be categorized into five major stages: ITO pattern etching, alignment (including polyimide coating and rubbing), cell assembly, cutting and liquid crystal filling, and final‑product inspection and packaging. Among these, polyimide coating, alignment rubbing, and cell‑assembly processes—key steps in the front end—play a decisive role in LCD production, directly influencing display performance.
PI Coating: The Cornerstone for Constructing Molecular Orientation
Coating an alignment layer on the substrate surface is a key step in manufacturing liquid crystal modules ( The first critical process in the LCD module. Using precision coating technology, polyimide (PI) is uniformly applied to ITO glass, followed by a carefully temperature‑controlled curing step to form a stable alignment layer. Thanks to its excellent chemical stability, high dielectric strength, and superior thermal resistance, PI ensures the long‑term reliability of the liquid crystal display. The accuracy of this process directly affects the quality of subsequent liquid crystal molecular alignment, serving as a fundamental prerequisite for achieving high‑performance displays.
Directional Friction: Precision Control of Microstructure
The directional friction process involves rubbing a specially designed velvet cloth in a specific direction. On the surface of the PI layer, uniform alignment grooves are formed at the microscopic level. These nanoscale grooves guide the liquid crystal molecules to align in a predetermined direction, thereby determining the viewing‑angle characteristics of the LCD panel. It is worth noting that while the rubbing direction defines the viewing angle, the actual range of the viewing angle is independent of it. As a professional LCD manufacturer, we precisely control both the rubbing angle and pressure to ensure that each custom‑made LCD panel delivers its intended optical performance.
Boxing Process: Building a Stable Display Unit
The boxing process comprises three key steps:
Silk-screen frame dots: Employing silk-screen printing technology to precisely apply edge‑seal adhesive, thereby forming a sealed structure.
Powder‑spraying process: uniformly distribute support material and precisely control box‑wall thickness tolerances.
Composite curing: Achieves permanent bonding between the upper and lower substrates through high-temperature curing.
This series of processes creates a stable confinement space for liquid crystal molecules, and the precision of this fabrication directly affects the display uniformity and service life of the liquid crystal module. In particular, during the production of custom‑made LCD panels, we can adjust the cell‑gap parameters to meet customer requirements and optimize display performance.
Process Extension: The Unique Value of TOP Coating
For the high-end For STN products, the TOP coating process adds an SiO2 layer after lithography, which both fills the electrode trenches and provides insulation while improving viewing angles. This specialized manufacturing process reflects LCD manufacturers’ ongoing commitment to product performance and offers greater technical flexibility for custom‑made LCD panels.
CNK Electronics,凭借在 Our deep expertise in PI coating, rubbing, and cell‑assembly processes ensures that every liquid crystal module meets stringent quality standards. By leveraging precise process control and a robust quality management system, we are committed to delivering reliable display solutions to customers worldwide and driving continuous advancements in display technology.
About CNK
CNK Electronics (abbreviated as CNK was founded in Shenzhen in 2010 and expanded its investment in Wuping, Fujian, in 2019. It is a national “Little Giant” enterprise specializing in the integrated design, development, manufacturing, and sales of display devices. The company is committed to seamlessly blending 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.
Related News
> Established CNK Electronics’ Wuhan and Xiamen offices > Awarded the national “Little Giant” designation for specialized, refined, distinctive, and innovative enterprises > Recognized as a “Gazelle” innovative enterprise for four consecutive years > Certified as a provincial-level “Green Factory” > Listed on Fujian’s specialized board for “Specialized, Refined, Distinctive, and Innovative” enterprises > Designated as an innovation talent hub > Obtained ISO 13485:2016 and SA8000:2014 certifications
2025/12/25
CNK Electronics: Conducting Health Checkups for Employees’ Hearts
To promote the physical and mental well-being of all employees, CNK Electronics organized a free electrocardiogram screening program. The initiative included ECG examinations, cardiovascular health education lectures, blood pressure measurements, and centralized report review; those with abnormal results would receive individual follow-up. Every component was practical and thorough.
2026/09/20
In September, join CNK for a heartwarming birthday celebration.
The September breeze, carrying the gentle touch of early autumn, softly caresses every corner of CNK. In this season of harvest, we gather for a special occasion—the CNK employees’ September birthday celebration.
2026/09/14
On September 4, 2026, the 21st China International Small and Medium Enterprises Fair grandly opened at the China Import and Export Fair Complex in Guangzhou. Approved by the State Council and dedicated to small and medium-sized enterprises, this year’s fair is themed “Artificial Intelligence Empowering SMEs” and has attracted more than 2,000 domestic and international companies as exhibitors.
2026/09/04
© 2025 Shenzhen Xienkai Electronics Co., Ltd.
Website Development:China Enterprise Dynamics Shenzhen