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TFT LCD Modules And Displays: What Are They?

Views: 291     Author: Kaylee     Publish Time: 2023-11-20      Origin: Site


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TFT LCD Modules And Displays: What Are They?

An LCD display that employs thin-film transistor technology to enhance image quality is known as a thin-film transistor liquid crystal display, or TFT LCD display for short.Comparing TFT LCD displays to conventional LCD displays reveals numerous benefits. TFT LCDs use a thin film of transistors as opposed to standard LCDs, which use a single layer of transistors. This enables reduced power usage, quicker response times, and higher image quality. TFT LCDs are perfect for usage in portable devices since they are lighter and thinner than conventional LCDs.The viewing angle and color reproduction of a TFT LCD should be taken into account. TFT IPS panels cost more money even though they provide higher image quality.To discover more about TFT LCD screens, their functions, and the range of uses for which they are used, continue reading.

How Function TFT LCDs?

The color filter array and the transistor array are the two major components of TFT LCDs.The layer of transistors composed of a substance like silicon is known as a thin-film transistor array. The control circuitry is coupled to the array of transistors. The drivers that regulate the voltage provided to the transistors are part of the control circuitry.

The layer of the LCD that houses the color filters is called the color filter array. The color filters are placed in a certain pattern and are composed of dyes or pigments. The most widely used patterns are CMYK (cyan, magenta, yellow, black) and RGB (red, green, blue).

The transistors in the transistor array turn on and let light in when a voltage is supplied to it. The color filter array then transforms this light into a picture.

What Constitutes A TFT Display Module's Essential Components?

A typical TFT display module consists of numerous elements in addition to the color filter array and the thin-film transistor array.


  • Layer Of Liquid Crystal

The LCD layer that has liquid crystals in it is known as the liquid crystal layer. The ingredients used to create the liquid crystals include cholesteric and nematic.

There is a pattern to the arrangement of the liquid crystals. Twist nematic (TN), super twisted nematic (STN), and in-plane switching (IPS) are the most widely used patterns. The voltage delivered to the electrodes controls the liquid crystals, which are aligned with the electric field.

The liquid crystals twist when an electric field is applied to them. A certain color of light can pass through due to this twisting. The liquid crystal layer then modifies the light.

  • Encase Glass

In addition to providing a surface for human interaction, the cover glass shields the LCD from harm.

TFT LCD cover glass comes in two varieties. Gorilla Glass or soda-lime glass are the two materials used to make rigid cover glass. Certain TFT LCDs, including those in mobile phones, have flexible cover glass. Flexible cover glass is perfect for use in portable electronics since it is more shatterproof than stiff cover glass.

  • Reflector Unit

The LCD layer that emits light is called the backlight. External electrode fluorescent lamps (EEFLs), cold cathode fluorescent lamps (CCFLs), hot cathode fluorescent lamps (HCFLs), light-emitting diodes (LEDs), and electroluminescent panels (ELPs) can all be used as backlights.

Smaller displays are most frequently equipped with backlights to improve legibility in low light.

  • Touchpad

The touchscreen, which enables user interaction with the display, is an optional component of the display module. A pressure-sensitive substance put on a layer of glass is called a touchscreen. The pressure that the user applies to the touchscreen is detected and transformed into an electrical signal.

There are several kinds of touchscreens available, such as surface acoustic wave, resistive, and capacitive touchscreens.

  • Bezel

An additional possible component of the display module is the bezel. It serves as damage prevention for the display module.

  • IC Driver

The TFT LCD screen must be driven by the driver integrated circuit. It transforms digital signals into analog signals so that the TFT LCD panel can use them.

Design Of Rubber Frame For TFT LCD LCD Display Module  

The rubber frame design of the TFT LCD LCD display module involves fixing the position of the LCD screen, storing optical materials, and embedding sheet metal materials. When designing the gaps between the rubber frame and these related materials, it is necessary to consider the tolerances of the display screen, optical materials, and other metal materials. If necessary, it is also necessary to consider the dimensional changes caused by changes in temperature and humidity of the materials. This article mainly introduces the rubber frame design of TFT LCD liquid crystal display module. The main items that need to be considered in the design of rubber frames include: gaps, optical characteristics, embedding, substrate fixation, etc.


  • Optical Characteristics.

In the design of optical characteristics of rubber frames, light leakage measures and display area measures need to be taken. To prevent light leakage, it is necessary to control the overlap between the rubber frame and the polarizing plate, as well as the overlap between the rubber frame and the display BM, during the design of the rubber frame. However, it is also important to pay attention to the display area. If the line of sight is blocked by the rubber frame, the blocked display area cannot be seen. So it is necessary to ensure that within the specified viewing angle range, the line of sight of any viewing angle cannot be blocked by the rubber frame.

  • Glue Frame Embedding.

The rubber frame will be embedded with other related materials during actual assembly. In design, it is important to have a good grasp of the amount of chimerism involved. At the same time, it is necessary to improve the operability of the embedding by designing a reasonable embedding shape to ensure that the relevant materials are not easily damaged during the embedding process.

  • Fix The Substrate.

The design of the rubber frame also needs to consider the fixation of the L-shaped COF bending substrate to prevent the substrate from loosening after being impacted. The design of substrate fixation mainly determines the corresponding position of the substrate on the adhesive frame, and designs the structure for fixing the substrate position on the adhesive frame. Design a concave part on the rubber frame and a convex part on the substrate, and fix the position of the substrate through concave-convex inlay.

In addition to the above points, the rubber frame design of the TFT LCD display module also needs to consider avoiding defects such as shrinkage marks, cracks, warping, and deformation. And control the position of the gate and the ejector pin during demolding. The above is a brief introduction to the design of the TFT LCD screen frame.




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