LED display advantages
1, the area is malleable, the LCD area is large, it is difficult to achieve seamless splicing, the LED display can be arbitrarily extended, and seamless splicing.
2, LCD plasma screen luminous flux attenuation is very fast, generally run about a year and a half or so, you need to replace, but the LED display under the same operating conditions for at least five years no problem.
3, LED brush screen machine can use interactive technology to enhance the interaction between the screen and the advertising audience, such as custom touch screen, cloud technology broadcast control management.
4. In terms of display effect, the high brightness of the LED display screen, the wide viewing angle and the good color reproduction ability are also superior to the LCD screen. LED brush screen machines are generally used in airports, shopping malls, hotels, high-speed rail, subway, cinema, exhibitions, office buildings, etc., target customers have strong spending power and have huge advertising value.
LED screen brightness judgment method analysis
First, how to identify the brightness of the LED display
1. Make a 3V DC power supply that is easy to connect to the LEDs. It is best to use a battery. Two button batteries can be used, which are installed in a small plastic tube and lead two probes as positive and negative outputs. The tail end is directly made into a switch by the elastic piece. When used, the positive and negative probes correspond to the positive contact of the light-emitting diodes. Negative pin, press and hold the switch at the end, the light tube is illuminated.
2. Secondly, use a photoresistor and a digital multimeter to form a simple metering device. The photoresistor is led out of two thin wires and directly connected to the two meter pens of the digital multimeter. The multimeter is placed in the 20K position (depending on the photoresistor, Try to make the readings accurate. Note that the measured value is actually the resistance of the photoresistor, so the brighter the light, the smaller the value.
3. Take an LED light-emitting diode and illuminate it with the above 3V DC. The light-emitting head is facing and close to the photosensitive surface of the connected photoresistor. At this time, the multimeter reads to distinguish the LED brightness.
Second, the brightness discrimination level refers to the brightness level of the image that can be distinguished by the human eye from the darkest to the whitest.
The gray level of the LED display is very high, and can reach 256 or even 1024. However, since the human eye has limited sensitivity to brightness, these gray levels cannot be fully recognized. That is to say, many grayscale human eyes of adjacent levels may look the same. And the ability to distinguish the eyes is different for each person. For the display, the level of human eye recognition is naturally as good as possible, because the displayed image is for everyone to see. The more brightness levels the human eye can distinguish, the greater the color space of the display and the greater the potential for displaying rich colors. The brightness discrimination level can be tested with special software. Generally, the display can reach 20 or higher, even if it is a good level.
Third, the brightness and viewing angle requirements:
The brightness of the indoor full-color LED display should be above 800cd/m2, and the brightness of the outdoor full-color display should be above 1500cd/m2 to ensure the normal operation of the display. Otherwise, the displayed image will not be seen because the brightness is too low. The brightness is mainly determined by the quality of the LED die. The size of the viewing angle directly determines the number of LED display audiences, so the bigger the better. The viewing angle is primarily determined by the die package.
It is very necessary to determine the brightness of the LED display. The brightness requirements of the current urban LED display, or the new regulations, the brightness of the LED screen is too high, it will cause trouble to nearby residents. In order to avoid bad reactions, this requires merchants to have relevant expertise in customizing and maintaining LED displays.
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