What is the working principle of a TFT LCD screen?

In modern industrial and consumer electronics fields, TFT (Thin Film Transistor Liquid Crystal Display) has become one of the most common display technologies. It is widely used in smartphones, tablets, laptops, televisions, and various industrial equipment. TFT LCD screens, with their advantages of high resolution, low power consumption, and rich colors, have become the mainstream choice for display technology. LEEHON Technology, as a professional display technology provider, is committed to providing customers with high-performance, high-reliability TFT LCD screen solutions.

I. Working Principle of a TFT LCD Screen

(I) Optical Properties of Liquid Crystals
Liquid crystals are a special substance between liquids and crystals, possessing unique optical properties. Under the influence of an electric field, the arrangement of liquid crystal molecules changes, thereby altering the polarization direction of light. TFT LCD screens utilize this property to adjust the light transmittance by controlling the arrangement of liquid crystal molecules.

(II) The Role of TFTs
TFTs (Thin Film Transistors) are the core components of TFT LCD screens, acting as a switch. Each pixel is equipped with a TFT. When a TFT is turned on, current flows through the liquid crystal layer, changing the arrangement of liquid crystal molecules, thereby controlling the brightness and color of that pixel. (III) Display Process

Backlight: A TFT LCD screen requires a backlight to provide light. The light emitted from the backlight is modulated by the liquid crystal molecules as it passes through the liquid crystal layer.

Polarizer: Polarizers are placed on both sides of the liquid crystal layer. The function of the polarizer is to convert the light emitted from the backlight into polarized light.

Pixel Control: The voltage of each pixel is controlled by the TFT, changing the arrangement of liquid crystal molecules and thus adjusting the light transmittance. Ultimately, the brightness and color combinations of different pixels form an image.

II. FQA

(I) How is the contrast ratio of a TFT LCD screen?

Contrast Ratio: The contrast ratio of a TFT LCD screen is typically around 1000:1. Although not as high as the infinite contrast ratio of AMOLED, modern TFT screens have achieved quite excellent contrast ratios through optimized backlighting and liquid crystal materials.

(II) How fast is the response time of a TFT LCD screen?

Response Time: The response time of a TFT LCD screen is relatively slow, especially in low-end TN panels. High-end IPS panels can achieve a response time of around 5ms, suitable for most applications.

(III) Does a TFT LCD screen support touch? Touch Support: TFT LCD displays can be equipped with resistive or capacitive touch layers. LEEHON Technology’s TFT displays support multiple touch methods to meet the needs of different customers.

(IV) What is the lifespan of a TFT LCD display?

Lifespan: The backlight lifespan of a TFT LCD display typically exceeds 50,000 hours. Under normal use conditions, the lifespan of a TFT display can exceed 10 years.

(V) Does a TFT LCD display support multi-touch?

Multi-touch: Modern TFT displays support multi-touch. LEEHON Technology’s TFT displays support up to 10-point touch, meeting complex interactive needs.

III. LEEHON Technology’s TFT LCD Display Solutions

LEEHON Technology offers a variety of high-performance TFT LCD displays suitable for various applications such as industrial control, medical equipment, and automotive displays. Its products utilize high-brightness LED backlights and anti-glare technology to ensure clear and stable display in various environments. LEEHON Technology also provides customized services to meet the specific needs of different customers.

Conclusion

With its advantages of high resolution, low power consumption, and rich colors, TFT LCD displays have become the mainstream choice for display technology. As an industry leader, LEEHON Technology continuously drives technological innovation to provide customers with more efficient and reliable display solutions. Whether in industrial equipment, medical instruments, or automotive displays, TFT LCD screens deliver a superior visual experience.