In modern display technology, the liquid crystal display (LCD) screen serves as a core component, with its overall performance largely dependent on the underlying integrated module—the LCD Module (LCM). The LCM integrates the liquid crystal display panel, driver circuitry, structural components, and the backlight into a single, cohesive unit, and the backlight’s luminous output directly determines the final visual quality of the display. Within the backlight’s intricate architecture, elements such as the adhesive frame and double-sided adhesive work in concert with key components like optical films and light sources to ensure both the module’s stability and its optical performance.

Backlight: The Cornerstone of Visual Display

The backlight is positioned behind the liquid crystal display, with the primary function of converting a point light source into a uniform, bright surface light. Its optical design directly impacts the module’s brightness uniformity, contrast ratio, and color performance, making it especially critical for color‑display modules (TFT display modules). A typical backlight assembly is meticulously engineered from components such as the light source, light guide plate, multi‑layer optical films, structural adhesive frame, and driver board. The ongoing innovations of many leading Chinese LCD manufacturers worldwide in this field are rooted in a deep understanding of the role each component plays.

Optical Frame: A Dual Guardian of Optics and Structure

The light guide frame serves as the backbone of the backlight module; it not only provides essential mechanical support and protection but also performs critical optical management functions. The choice of materials is directly tailored to meet the requirements of different product designs:

URZ2501 material : Possesses excellent reflective and light-shielding properties, commonly used in mid- to high-end applications. Color display module (TFT display module) , which helps enhance image contrast and color purity.

PC white material: It is commonly used in side‑entry backlight designs, which helps to achieve a thinner and lighter LCD screen.

PC white + glass fiber material: It enhances the structural rigidity of backlit products, making them suitable for industrial environments with stringent reliability requirements.
In Custom LCD screen (customize LCD) In this project, the design and material selection of the lens frame are critical components for achieving the desired optical performance and mechanical specifications.

Double-sided tape: the stealthy expert in adhesion and light blocking

Double-sided adhesive plays an indispensable “bonding” role in LCM assembly. It secures various internal optical films, such as the light guide plate, diffuser film, and brightness enhancement film, and ultimately attaches the backlight to… Liquid crystal display (LCD screen) Firmly integrated.

Standard double-sided tape: It is available in a variety of substrates (such as substrate-free, PET, etc.) and thicknesses (0.03–0.30 mm). When bonding COG‑type LCD panels, selecting a double-sided adhesive of the appropriate thickness can effectively cushion mechanical stress and prevent the formation of white spots on the display.

Black-and-white double-sided tape: This is a functional material: one side is black for light blocking, while the other side is white for reflection, simultaneously fulfilling three functions—adhesion, light blocking, and reflection. It is often used to define… Color display module (TFT display module) The effective display area and the fixation of the flexible printed circuit (FPC) are critical components for enhancing display edge clarity and overall reliability.

Conclusion

In LCM’s precision systems, every component—from the light-emitting LEDs and light-guiding plates to the fixed adhesive frame and double-sided tape—fulfills a unique and irreplaceable function. These parts work in meticulous coordination; the absence or defect of even a single element can compromise the overall performance and reliability. The value of the adhesive frame and double-sided tape lies precisely in their indispensable synergy with other core components, such as the backlight and the liquid crystal panel, together forming the foundation of a stable, efficient, and high‑quality display module.

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 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 even higher‑quality, more reliable, and faster‑response services to its clients.