Shenzhen Lianchengfa Technology Co., Ltd.

1. How to identify the brightness of the LED display

1. Make a 3V DC power supply by yourself, which is convenient to connect to the light-emitting diode. It is best to use a battery. You can use two button batteries, installed in a small plastic tube, and lead out two probes as positive and negative output. The tail end is directly made into a switch with shrapnel. When in use, the positive and negative probes correspondingly contact the positive and negative pins of the light-emitting diode, and press and hold the tail switch to make the light-emitting tube emit light.

2. Secondly, combine the photoresistor and digital multimeter into a simple light metering device. Lead the photoresistor with two thin wires and connect them directly to the two test leads of the digital multimeter. The multimeter is placed at the 20K position (depending on the photoresistor and Set, try to make the reading accurate). Note that the measured value is actually the resistance value of the photoresistor, so the brighter the light, the smaller the value.

3. Take an LED light-emitting diode and use the above 3V direct current to light it up, the light-emitting head is directly opposite, and it is close to the photosensitive surface of the connected photoresistor. At this time, the multimeter displays the readings to distinguish the brightness of the LEDs.

2. The brightness discrimination level refers to the brightness level of the image that the human eye can distinguish from the darkest to the whitest

Some LED displays have very high gray levels, up to 256 or even 1024. However, due to the limited sensitivity of the human eye to brightness, these gray levels cannot be fully identified. In other words, many gray people of adjacent levels may look the same. And everyone's eyes have different ability to distinguish. The more human eye recognition levels, the better, because the image displayed by the LED is for people to see after all. The more brightness levels the human eye can distinguish, the larger the color space of the LED display, and the greater the potential for displaying rich colors. The brightness recognition level can be tested with special software, and the general LED display can reach a level above 20 or even better.

3. 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 LED display should be above 1500cd/m2 to ensure the normal operation of the display, otherwise the displayed image will be invisible due to the low brightness clear. The brightness is mainly determined by the quality of the LED die. The number of audiences of the LED display is directly determined by the viewing angle, so the bigger the better. The viewing angle is mainly determined by the die package.

It is very necessary to determine the brightness of the LED display. At present, the brightness requirements or new regulations of urban lighting LED display screens, the excessively high brightness of LED display screens will cause trouble to nearby residents. In order to avoid adverse reactions, businesses need to have relevant professional knowledge when customizing and maintaining LED displays. At present, Lianchengfa LED display brightness and other indicators are in line with relevant national regulations and requirements.