Comparison Of LCD And Traditional CRT Displays

- Apr 12, 2018-


Display is an important interface between humans and machines. Early CRT/Cathode Ray Tube displays were the mainstay. However, with the continuous advancement of technology, various display technologies have mushroomed. Recently, LCDs have become thin and short. , low power consumption, no radiation hazards, flat right angle display, and the advantages of image stabilization and non-blinking, etc. In recent years, with the continuous drop of prices, it gradually replaced the mainstream position of CRT, and the display is full of stars. What are the obvious features of LCD compared with previous CRTs?

First, the display quality is high

    Since each point of the liquid crystal display maintains that color and brightness after receiving the signal, it constantly emits light, unlike the cathode ray tube display (CRT), which needs constantly refreshing the bright spot. Therefore, the liquid crystal display is high in image quality and never blinks, minimizing eye strain.

Second, no electromagnetic radiation

    The display material of traditional displays is a phosphor, which is displayed by the electron beam impinging on the phosphor. The electron beam generates strong electromagnetic radiation in the instant that it hits the phosphor, although there are many display products that are currently compared to deal with radiation. Effective treatment minimizes radiation as much as possible, but it is difficult to completely eliminate it. In contrast, liquid crystal displays have an inherent advantage in preventing radiation because it does not have radiation at all. In the aspect of electromagnetic wave prevention, the liquid crystal display also has its own unique advantages. It adopts a strict sealing technology to enclose a small amount of electromagnetic waves from the drive circuit in the display. However, in order to dissipate the heat, the ordinary display must make internal circuits as much as possible. Contact with the air, so that the electromagnetic waves generated by the internal circuit will also "leak" outward.

Third, large viewing area

    For the same size display, the liquid crystal display has a larger viewing area. The viewing area of a liquid crystal display is the same as its diagonal size. A one-inch frame around the front panel of the cathode ray tube display tube cannot be used for display.

Fourth, a wide range of applications

    The initial liquid crystal display is often used on electronic watches and calculators because it cannot display delicate characters. With the constant development and progress of liquid crystal display technology, character display began to be delicate, and at the same time, it also supported basic color display, and was gradually used in liquid crystal televisions, video camera LCD monitors, and handheld game consoles. Subsequent DSTN and TFT are widely used as liquid crystal display devices in computers. DSTN liquid crystal displays are used in early notebook computers; TFTs are used in notebook computers (most notebook computers now use TFT displays). It is also used on mainstream desktop monitors.

Fifth, the screen effect is good

    Compared with the traditional display, the liquid crystal display uses a purely flat glass plate at the beginning, and its display effect is a right angle of the plane, giving people a refreshing feeling. And the liquid crystal display is easier to achieve high resolution on a small area of the screen. For example, a 17-inch liquid crystal display can achieve a resolution of 1280×1024, and a resolution of 1280×1024 or more is generally used on an 18-inch CRT color display. The picture effect is not completely satisfactory.

Six, digital interface

    LCDs are digital, unlike cathode ray tube color displays using analog interfaces. In other words, using a liquid crystal display, the graphics card no longer needs to convert digital signals into analog signals as usual. In theory, this will make the color and positioning more accurate and perfect.

Seventh, "body" is well-proportioned and compact

    Traditional cathode ray tube displays are always followed by a bulky tube. LCD monitors broke through this limit and gave people a new feeling. Conventional displays use electron guns to emit electron beams to the screen, so the neck of the picture tube cannot be made short. When the screen is increased, it will inevitably increase the size of the entire display. The liquid crystal display achieves the display purpose by controlling the state of the liquid crystal molecules through the electrodes on the display screen. Even if the screen is enlarged, its volume will not increase in proportion, and it is much lighter than the conventional display with the same display area.

Eight, power consumption is small

    The traditional display is composed of many circuits. When these circuits drive cathode ray tubes, they need to consume a lot of power. With the increase of the volume, the power consumption of the internal circuits will certainly increase. In comparison, the power consumption of the liquid crystal display is mainly consumed in its internal electrodes and drive ICs, and thus the power consumption is much smaller than that of the conventional display.