What is the working principle of an LCD?

In today’s display technology field, LCD (Liquid Crystal Display) is a mature display technology widely used in various electronic devices, from smartphones and tablets to industrial control equipment and automotive systems. With its high resolution, low power consumption, and rich colors, LCD has become an important component of display technology. LEEHON Technology, as a professional display technology provider, is committed to providing customers with high-performance, high-reliability LCD display solutions.

I. The Working Principle of an LCD

(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. LCDs utilize this property to adjust the transmittance of light by controlling the arrangement of liquid crystal molecules.

(II) Main Structure
The main structure of an LCD includes:

• Liquid Crystal Layer: Composed of liquid crystal molecules, it is the core component for displaying images.
• Polarizer: Placed on both sides of the liquid crystal layer, it converts the light emitted from the backlight into polarized light.
• Backlight: Provides light, typically an LED (Light Emitting Diode).
• Color Filter: Used to generate color images.

TFT (Thin Film Transistor): Controls the voltage of each pixel, adjusting the alignment of liquid crystal molecules.

(III) Display Process
Backlight Emission: Light emitted from the backlight passes through the lower polarizer and is converted into polarized light.

Liquid Crystal Molecule Modulation: The voltage of each pixel is controlled by the TFT, changing the alignment of liquid crystal molecules and adjusting the light transmittance.

Color Filter: Light passing through the liquid crystal layer passes through the color filter to generate a color image.

Upper Polarizer: The upper polarizer further filters the light, ensuring that only light with a specific polarization direction can pass through.

Image Display: The brightness and color combinations of different pixels form a complete image.

II. FQA

(I) What is the difference between LCD and LED?

LCD: A display technology that relies on a backlight (usually LED) to provide light.

LED: A light-emitting technology that can be used as a backlight for LCDs or for illumination alone.

(II) What is the contrast ratio of an LCD?

Contrast Ratio: The contrast ratio of an LCD is typically around 1000:1. While not as high as OLED’s infinite contrast ratio, modern LCDs offer excellent contrast thanks to optimized backlighting and liquid crystal materials.

(III) Does the LCD support touch?

Touch Support: LCDs can be equipped with resistive or capacitive touch layers. LEEHON Technology’s LCD displays support multiple touch methods to meet the needs of different customers.

(IV) What is the lifespan of the LCD?

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

(V) Does the LCD support multi-touch?

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

III. LEEHON Technology’s LCD Display Solutions

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

Conclusion

With its advantages such as high resolution, low power consumption, and rich colors, LCD has become an important part of display technology. As an industry leader, LEEHON Technology continues to drive technological innovation, providing customers with more efficient and reliable display solutions. Whether in industrial equipment, medical instruments, or automotive displays, LCD delivers a superior visual experience.