What Is The Difference Between Lcd And Lcm?

- Apr 09, 2018-


The liquid crystals were first discovered by the Austrian botanist F. Reinitzer in 1888. When he measured the melting points of organic matter, he discovered that certain organic substances (cholesteric benzoates and acetates) melted and then experienced a melting point. It is opaque white and cloudy liquid state, and gives off a colorful and beautiful pearl luster, and will only become transparent and clear liquid when it is heated to a certain temperature. The following year, the German physicist O. Lehmann used his own design to observe these lipid compounds as a state-of-the-art polarizing microscope with a heating device. He found that this kind of white, turbid liquid, although liquid in appearance, showed the characteristic birefringence of anisotropic crystals. So Lehman named it "liquid crystal," which is where the name "liquid crystal" comes from.

Liquid crystal is an organic compound with a regular molecular arrangement between a solid and a liquid. In general, the most commonly used liquid crystal type is a nematic liquid crystal, and the molecular shape is an elongated rod shape with a length and width of about 1 nm to 10 nm at different currents. Under the action of the electric field, the liquid crystal molecules will make a regular rotation of 90 degrees, resulting in a difference in transmittance, so that in the power ON / OFF under the difference between light and shade, in accordance with this principle to control each pixel, you can form the desired image.

The difference between lcd and lcm

LCD introduction

LCD is the abbreviation of English Liquid Crystal Display, namely liquid crystal display, it is a kind of digital display technology, can filter the light source through the liquid crystal and color filter, produce the image on the flat panel. Compared with the traditional cathode ray tube (CRT), the LCD has a small footprint, low power consumption, low radiation, no flicker, and reduced visual fatigue. Inadequate: Compared with the same size CRT, the price is more expensive.

After years of leadership in the notebook computer market, smooth display screens based on LCD technology are gradually entering the desktop market. LCD has many advantages that traditional CRT display technology does not have, it can provide more clear text display, and the screen is flicker-free, which can effectively reduce the visual fatigue caused by long time watching the screen. The thickness of the LCD display is generally not more than 10 inches, so if the desktop system uses LCD technology, it will save more space. Although the LCD display has its alluring uniqueness, it is undeniable that the LCD still has deficiencies in high-quality color display compared with the main competitor CRT display. In addition, the wide price difference makes the LCD still only Luxury products enjoyed by a few people.

What is LCM

LCM English name Liquid Crystal Display Module, LCD display module, LCD module, refers to the liquid crystal display device, connectors, control and drive peripheral circuits, PCB circuit board, backlight source, structural components and other components together.

The difference between lcd and lcm

The difference between lcd and lcm

The LCD is an abbreviation for Liquid Crystal Display. To put it plainly, it is a monitor.

The LCD is a display (lcd LCD). The LCM is a collection of various devices including an LCD and a chip, a circuit board, and the like that control the display mode and contents of the LCD. It can be said that LCD is the front of the display content, and LCM is the entire operating system including the front desk.

1、LCD=Liquid Crystal Display

2. Mainly refers to: LCD panel, including polarizer, color filter, liquid crystal glass (glass clip liquid crystal), TFT control parts

3, LCM = Liquid Crystal Module LCD module

4, including: LCD panel and the following accessories, mainly backlight module, a brightness enhancement film, translucent film, reflective film, diffusion film, bracket, LED lamp (light source), FPC and component devices

5. In fact, in general, both regard the same meaning.


The main differences between LCD and LCM are:

1, LCM with character library; LCD does not carry the font.

2, LCD is a liquid crystal display, generally refers to a separate screen; LCM is a liquid crystal display module, which includes the corresponding drive circuit and control circuit, can be directly connected with the microcontroller.

The LCD module is simply the LCD screen + LED backlight board + PCB board + iron frame. Modules are mainly divided into screen and backlight components. The two parts are assembled together, but they work independently of each other (that is, the circuits are not related). The principle of liquid crystal display is that the backlight unit emits uniform surface light and the light is transmitted through the LCD screen to our eyes. The role of the screen is to process these lights by pixels to display the image.