If you want to separate the brightness of the Led Display in Chengdu, how much do you know about the brightness of the LED display in Chengdu? LED lighting has been recognized as the most energy-efficient lighting fixture available today. However, the brightness of commercially available LED diodes is not uniform and is indistinguishable from the naked eye. As we all know, the brightness of white astigmatism LED light-emitting diodes is divided into several brightness levels, which is one of the important performance indicators of light-emitting diodes. LED light-emitting diodes commonly used in lighting lamps are generally used as light-emitting tubes with brightness of 1400-1600MCD. The light source, however, is sold in the market, the LED light tube is mixed with the dragon, the quality is also uneven, the brightness is not guaranteed, the light-emitting diodes with brightness of 1400-1600MCD are marked in each store, many of which can not reach the brightness indicated. The phenomenon of sub-charging is deceiving consumers. Most people do not have the ability to identify the brightness of LED tubes. Therefore, the merchants say how much brightness is how much brightness. For the size of the brightness is not as large as possible, but according to customer needs, the appropriate brightness will achieve unexpected results. Method of identifying the brightness of an 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 display is very high, which 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, brightness and viewing angle Indoor full color screen brightness should be above 800cd/m2, outdoor full color screen brightness should be 1500cd/m2 or more, in order to ensure the normal operation of the display, otherwise it will not be clear because the brightness is too low Image. The brightness is mainly determined by the quality of the LED die. The size of the viewing angle directly determines the number of display audiences, so the bigger the better. The viewing angle is primarily determined by the die package.
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