LED electronic display screen brightness identification
First, how to identify the brightness of the LED display?
1, do-it-yourself production of a light-emitting diode to facilitate the connection of 3V DC power supply, it is best to use the battery production. You can use two button batteries, installed in a small plastic tube and lead to two probes as positive and negative output, the end of the shrapnel directly into a switch, use, positive and negative probes corresponding to the contact light-emitting diode positive and negative pins, hold down the end of the switch, the light-emitting diode is electrically powered to emit light.
2, second, with the photoresistor and digital multimeter combined into a simple light measurement device, the photoresistor leads to two thin wires, directly connected to the digital multimeter on the two pens, the multimeter is placed on the 20K position (depending on the photoresistor, try to make the readings accurate), pay attention to the measured value is actually the photoresistor resistance, so the brighter the light the smaller the value.
3, take a LED light-emitting diode, with the above 3V DC light, light-emitting head right and tightly connected to the light-sensitive surface of the photoresistor, at this time, the multimeter appears to read, so as to distinguish the brightness of the LED light-emitting.
Second, brightness identification level, refers to the human eye can distinguish between the image from the blackest to the most white brightness level.
LED display gray level of some very high, can reach 256 or even 1024 levels. But due to the limited sensitivity of the human eye to brightness, and can not fully recognize these gray levels. That is to say, there may be many adjacent levels of gray scale human eyes look the same. Moreover, the eye's ability to recognize these levels varies from person to person. For the display, the human eye to recognize the level of nature is the more the better, because the display image is, after all, for people to see. The more luminance levels the human eye can distinguish means the larger the color space of the display, the greater the potential to display rich colors. Brightness identification level can be tested with special software, the general display can reach more than 20 levels even if it is a better grade.
Third, the brightness and viewing angle requirements:
Indoor full-color LED display brightness to be more than 800cd/m2, outdoor full-color screen brightness to be more than 1500cd/m2, in order to ensure that the normal work of the display, otherwise it will be too low because of the brightness and can not see the image displayed. The size of the brightness is mainly determined by the LED tube core. The size of the visual angle directly determines the size of the LED display audience, so the bigger the better. Viewing angle is mainly determined by the core package.
Determine the brightness of the LED display is very necessary, the current city lighting LED display brightness requirements, or new regulations, the brightness of the LED screen is too high, then it will be a nuisance to nearby residents. In order to avoid adverse repercussions, this requires the businessman in the customization and maintenance of LED display screen need to have relevant expertise.
