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The working principle of mobile phone LCD screen

The working principle of mobile phone LCD screen

Mobile phone LCD is an advanced technology that utilizes different types of physical properties and electrical principles to produce different colors and images. The most common screen technologies today are Liquid Crystal ( LCD), Organic Light Emitting Diode (OLED) and Surface Acoustic Wave (SSA) technology based on capacitive touch screens.
The working principle of the mobile phone LCD screen is to generate images through the orientation of liquid crystal molecules in the liquid crystal layer. An electric field on the liquid crystal structure will control the orientation of the liquid crystal molecules, allowing light to better pass through pixels at specific locations. These pixels will be divided into light and dark parts by liquid crystal molecules in order to display images on the screen.

The OLED technology uses an organic material to be electrically excited in an external electric field to emit light, thereby producing an image. This technique works because OLED screens only need to be powered on when they need to be displayed, and completely turned off when not in use, which saves more power than other technologies.

Capacitive-based touch screens use electrochemical principles to write or recognize information through capacitive changes. The touch screen consists of two electrode plates covering the display panel and a sensing layer between the plates. When a finger touches the surface of the screen, the capacitance change in the sensing layer of the touch screen will be detected and converted into screen coordinate information in digital form. The biggest advantage of this technology is that it can recognize the pressure and direction of the finger, and it is very sensitive.

In general, different display screen technologies have their own unique working principles, using advanced electrical, chemical and physical principles to provide us with a clearer, high-resolution image experience.

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