Display performance test (LED screen, LCD screen)

 

1、 Development of display screen

 

The development of display has gone through countless changes from monochrome to color, from fuzzy to clear, from small to large. Manufacturers constantly improve and improve the production technology of display, so that their products can adapt to the changing consumer psychology and behavior.

 

In a word, more product forms, higher product quality and more complete product performance will be the inevitable trend of the future development of displays. Let's wait and see and continue to pay attention to the development process of displays.

 

Displays are roughly classified as follows:

 

1. CRT display

 

It is a display using a cathode ray tube. The cathode ray tube is mainly composed of five parts: electron gun, deflection coils, shadow mask, phosphor and glass shell. It is one of the most widely used displays at present. CRT flat panel display has the advantages of large visual angle, no bad points, high color restoration, uniform color, adjustable multi-resolution mode, short response time and so on, and the current CRT display price is much cheaper than LCD display. According to different standards, CRT displays can be divided into different types.

 

2. LED display

 

LED is the abbreviation of light emitting diode (LED). It is a display screen which can display text, graphics, images, animation, market, video, video signal and other information by controlling the display mode of semiconductor LED.

 

3. LCD display

 

LCD display, namely liquid crystal display, has the advantages of thin body, small floor area and small radiation, giving people the image of a healthy product. But the actual situation is not the case, the use of LCD screen may not be able to protect the eyes, which depends on the habit of using computers.

 

4. 3D display

 

3D display has been recognized as the ultimate dream of display technology development, and many enterprises and research institutions have been engaged in this research for many years. Japan, Europe and the United States, South Korea and other developed countries and regions have been involved in the research and development of stereoscopic display technology as early as the 1980s. In the 1990s, they have successively obtained different degrees of research results, and have developed two major stereo display technology systems, which need to wear stereo glasses and do not need to wear stereo glasses. In traditional 3D movies, there are two sets of images on the screen (from the two cameras which form an angle with each other during shooting). The audience must wear a polarizer to eliminate the ghost (let one eye only receive one set of images), thus forming parallax and creating stereoscopic sense

 

2、 Routine test items of display screen