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What is the difference between LCD and traditional CRT displays?


Display is an important interface for communication between humans and machines. In the early days, CRT/Catalyst Ray Tube displays were mainly used. However, with the continuous progress of technology, various display technologies have sprung up like mushrooms. Recently, due to the advantages of liquid crystal displays (LCDs) such as lightweight, short, low power consumption, no radiation hazards, flat angle display, and stable and non flickering images, prices have been continuously falling in recent years, Gradually replacing the mainstream position of CRT, the display is full of tomorrow's star posture. What are the obvious features of LCD compared to previous CRTs?

1、 High display quality

Due to the fact that every point on a liquid crystal display maintains that color and brightness after receiving a signal, it emits constant light, unlike cathode ray tube displays (CRTs) that require constant refreshing of bright spots. Therefore, LCD displays have high image quality and will never flicker, minimizing eye fatigue.

2、 No electromagnetic radiation

The display material of traditional displays is fluorescent powder, which is displayed by the impact of an electron beam on the fluorescent powder. The electron beam generates strong electromagnetic radiation in the moment it hits the fluorescent powder. Although many display products have effectively dealt with radiation issues to minimize the amount of radiation as much as possible, it is difficult to completely eliminate it. Relatively speaking, liquid crystal displays have inherent advantages in preventing radiation, as they do not have radiation at all. In terms of electromagnetic wave prevention, liquid crystal displays also have their own unique advantages. They use strict sealing technology to seal a small amount of electromagnetic waves from the driving circuit in the display. In order to dissipate heat, ordinary displays must make the internal circuit come into contact with air as much as possible, so that the electromagnetic waves generated by the internal circuit also leak out in large quantities.

3、 Large visible area

For displays of the same size, the visible area of LCD displays is larger. The visible area of a liquid crystal display is the same as its diagonal size. The front panel of the cathode ray tube display tube has a border of about one inch around it that cannot be used for display.

4、 Wide application range

The initial liquid crystal displays were usually used on spreadsheets and calculators due to their inability to display delicate characters. With the continuous development and progress of LCD display technology, character display has become more delicate, while also supporting basic color display, and gradually used in LCD TVs, LCD monitors for cameras, and handheld game consoles. Subsequently, DSTN and TFT were widely used as LCD display devices in computers, and DSTN LCD screens were used in early laptops; TFT is not only used on laptops (most laptops now use TFT displays), but also on mainstream desktop displays.

5、 Good visual effect

Compared to traditional displays, LCD displays initially use pure flat glass panels, with a flat right angle display effect that gives a refreshing feeling. Moreover, LCD displays are easier to achieve high resolution on small screens, for example, a 17 inch LCD display can achieve a good 1280 resolution × 1024 resolution, while typically 1280 is used on 18 inch CRT color displays × The image effect with a resolution of 1024 or higher cannot be completely satisfactory.

6、 Digital interface

LCD displays are all digital, unlike cathode ray tube color displays that use analog interfaces. That is to say, with LCD displays, graphics cards no longer need to convert digital signals into analog signals and output them as usual. In theory, this will make both color and positioning more accurate and perfect.

7、 The 'figure' is symmetrical and compact

Traditional cathode ray tube displays always have a bulky ray tube trailing behind them. LCD displays break through this limitation and give people a brand new feeling. Traditional displays emit electron beams onto the screen through an electron gun, so the neck of the picture tube cannot be made very short. As the screen increases, it will inevitably increase the volume of the entire display. The liquid crystal display uses electrodes on the display screen to control the state of liquid crystal molecules to achieve display purposes. Even if the screen is enlarged, its volume will not increase proportionally, and it is much lighter in weight than traditional displays with the same display area.

8、 Low power consumption

Traditional displays are composed of many circuits inside, which drive the cathode ray tube to work and consume a lot of power. Moreover, as the volume continues to increase, the power consumed by the internal circuits will definitely increase. Compared to traditional displays, the power consumption of LCD displays is mainly consumed by their internal electrodes and driving ICs, resulting in much lower power consumption.