What is the classification of the LED display according to the display performance? What are the precautions for the LED display?
Guide: LED Display – LED stands for Light Emitting Diode, a semiconductor device that emits light when an electric current passes through it. It is widely used as a display technology, composed of multiple small light-emitting diodes arranged in a matrix. These LEDs are usually red, but can also be green or blue, and they work by turning on and off to create images, text, videos, and animations. LED displays are commonly used in public spaces, digital signage, and outdoor advertising due to their brightness, energy efficiency, and long lifespan. There are different types of LED displays based on the content they show, such as text, graphics, and video. In this article, I will explain how LED displays are classified according to their performance and what precautions should be taken when using them.
Classification of LED Displays Based on Display Performance:
1. Video Display: This type of LED display is typically full-color and capable of showing high-resolution videos, animations, and dynamic content. It is often used in large outdoor screens and event venues.
2. Text Display: These are usually single-color displays, designed to show simple text messages. They are commonly used in digital billboards and information boards.
3. Graphic Display: These displays support dual-color or multi-color output and are used to show more complex graphics, logos, and visual content. They are ideal for indoor applications where color variety is needed.
4. Quote Display: Typically made with digital tubes or single primary color LEDs, these displays are used for displaying short messages, numbers, or simple phrases. They are often seen in retail environments or public transportation systems.
Important Precautions When Using LED Displays:
1. Switching Procedure: Always turn on the LED display in the correct sequence: first power on the system, then turn on the screen. When turning it off, do the opposite—turn off the screen first, then power down the system. Failing to follow this order may cause damage to the LEDs.
2. Wait Time Between Switches: Allow at least 5 minutes between turning the display on and off to prevent electrical stress on the components.
3. Software Access: Ensure that the engineering control software is running before powering on the display. This helps avoid unexpected behavior or system errors.
4. Avoid Full White Screen: Do not power on the display when it is in a full white state, as this can cause a surge in current and potentially damage the system.
5. Out-of-Control State: Avoid turning on the display if it is in an out-of-control state. This can lead to unpredictable behavior and increased risk of failure.
6. Environmental Conditions: If the ambient temperature is high or the cooling system is inadequate, avoid leaving the display on for extended periods to prevent overheating.
7. Unusual Brightness: If part of the display becomes excessively bright, turn it off immediately. Prolonged operation in this condition can cause permanent damage.
8. Power Issues: If the power switch frequently trips, inspect the display or consider replacing the switch to ensure safe operation.
9. Maintenance Checks: Regularly check the tightness of the mounting hardware. If any parts are loose, adjust or replace them promptly to maintain stability and safety.
10. Pest Control: Keep the area around the display clean and free from pests. Use rat poison or other deterrents if necessary to protect the equipment from damage.
Additional Tips for the Control Unit:
1. Power Cord Connection: Ensure that the power cords are correctly connected without reversing the live and neutral lines. Reconnect them exactly as they were originally placed.
2. Before Powering On: Before turning on the system, always check the connections and control board for any looseness or damage.
3. Cable Management: Do not change the position or length of communication cables or flat connectors unless necessary. Any changes should be done carefully to avoid signal loss or damage.
4. Safety First: If you notice signs like smoke, burning smells, or tripping circuits after moving the equipment, stop testing immediately and investigate the issue to prevent further damage.
brightness
LCD is a substance between solid and liquid. It can't emit light by itself, so it needs additional light source. Therefore, the number of lamps is related to the brightness of the Liquid Crystal Display. The earliest liquid crystal displays had only two upper and lower tubes, the lowest of the popular type was four lamps, and the high-end one was six lamps. The four-lamp design is divided into three types of placement: one is that there is a lamp on each of the four sides, but the disadvantage is that there will be dark shadows in the middle. The solution is to arrange the four lamps from top to bottom. The last one is the "U"-shaped placement form, which is actually two lamp tubes produced by two lamps in disguise. The six-lamp design actually uses three lamps. The manufacturer bends all three lamps into a "U" shape, and then places them in parallel to achieve the effect of six lamps.
Tip: Brightness is also a more important indicator. The brighter the LCD, the brighter the LCD, it will stand out from a row of LCD walls. The highlight technology we often see in CRT (ViewSonic is called highlight, Philips is called display Bright, BenQ is called Rui Cai) is to increase the current of the shadow mask tube to bombard the phosphor to produce a brighter effect. Such a technology is generally traded at the expense of image quality and the life of the display. All use this The products of this kind of technology are all bright in the default state, you always have to press a button to implement, press 3X bright to play the game; press again to turn to 5X bright to watch the video disc, a closer look is blurred, you need to watch The text has to be honestly returned to the normal text mode. This design actually prevents you from frequently highlighting. The principle of LCD display brightness is different from that of CRT. They are realized by the brightness of the backlight tube behind the panel. Therefore, the lamp has to be designed more so that the light will be uniform. In the early days when selling LCDs, it was a great thing to tell others that there were three LCDs. But at that time, Chi Mei CRV came up with a six-lamp technology. In fact, the three tubes were bent into a "U" shape. The so-called six; such a six-lamp design, plus the strong luminescence of the lamp itself, the panel is very bright, such a representative work is represented by VA712 in ViewSonic; but all bright panels will have a fatal injury , The screen will leak light, this term is rarely mentioned by ordinary people, the editor personally thinks it is very important, light leakage means that under a completely black screen, the liquid crystal is not black, but whitish and gray. Therefore, a good LCD should not emphasize brightness blindly, but more emphasis on contrast. ViewSonic's VP and VG series are products that do not emphasize brightness but contrast!
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