What is the brightness level of an LED screen? How to verify and distinguish the brightness of LED screens? I believe many people are concerned about this issue, but few can provide effective solutions for transportation. The engineering personnel of Display Technology will provide you with detailed answers in the following content. Let’s start learning together now.
LED screen brightness discrimination level refers to the brightness level of an image that the human eye can distinguish from the darkest to the whitest. The grayscale level of stage LED screens can be as high as 256 or even 1024 levels. However, due to the limited sensitivity of the human eye to brightness, these grayscale levels cannot be fully recognized.
Many grayscale people with adjacent levels may look the same. And the ability to distinguish between eyes varies from person to person. For display screens, the higher the level of human eye recognition, the better, because the displayed images are for people to see. The more brightness levels that the human eye can distinguish, the larger the color space of the display screen, and the greater the potential to display rich colors. The brightness discrimination level can be tested using specialized software, and generally, a display screen that can reach level 20 or above is considered a good level.
The brightness of indoor full-color LED display screens should be above 800cd/m2, and outdoor full-color screens should be above 1500cd/m2 to ensure the normal operation of the display screen. Otherwise, the displayed image may not be clear due to low brightness. The brightness is mainly determined by the quality of the LED chip. The size of the viewing angle directly determines the audience of the LED screen, so the larger the better. The perspective is mainly determined by the packaging of the tube core.
How to distinguish the brightness of LED screens?
1. Make a 3V DC power supply that is easy to connect to light-emitting diodes by yourself, preferably using batteries. Two button batteries can be used, installed in a small plastic tube with two probes as positive and negative outputs. The tail end is directly made into a switch with a spring clip. When in use, the positive and negative probes correspond to the positive and negative pins of the light-emitting diode. Press and hold the switch at the tail end, and the light-emitting diode will be powered on and emit light.
2. Secondly, a simple metering device is formed by combining a photoresistor and a digital multimeter. Two thin wires are led out of the photoresistor and directly connected to the two probes of the digital multimeter. The multimeter is set at 20K position (depending on the photoresistor, 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 light it up with a 3V direct current. The light emitting head should be facing and closely attached to the photosensitive surface of the connected photoresistor. At this time, the multimeter will display a reading to distinguish the brightness of the LED’s light emission.
It is very necessary to learn how to distinguish the brightness of LED screens. Currently, the brightness requirements for LED screens in urban lighting, or new regulations, may cause inconvenience to nearby residents if the brightness of LED screens is too high. To avoid negative feedback, LED display companies need to have relevant professional knowledge when customizing and maintaining LED screens. LED screen customers can also learn about the corresponding inspection methods for LED screen brightness and personally conduct LED screen brightness identification inspection.
