LED screen brightness judging method resolution

A, how to identify the brightness of the LED display

1, make myself a 3 v dc power supply for easy connection leds, had better use battery production. Can use two button batteries, installed in a small plastic tube and lead to two probes as output is negative, the end made a switch shrapnel directly, when used, plus or minus probe corresponding contact light-emitting diodes (leds) plus or minus pin, hold down the end of the switch, light electric light tube.

2, secondly, using photosensitive resistance and digital multimeter, simple metering device, the photosensitive resistance leads to the two thin wires, directly connected to the digital multimeter, on two pens and a multimeter gear in 20 k position (depending on the photosensitive resistance, make precise readings), note that the measured value is the actual value of photosensitive resistance, therefore, the brighter the light, the smaller the numerical value.

3, in a LED light-emitting diode, with more than 3 v dc lights, light head are connecting to and close to live good photoconductive resistance photosensitive surface, at this point, the multimeter reading, in order to distinguish the luminous intensity of LED.

Second, the brightness identification level, refers to the human eye can distinguish between the image from the black to the white brightness level.

LED display the grey scale of some high, can achieve grades 256 and 1024. But because the human eye sensitivity to the brightness is limited, and cannot fully identify the grey scale. That is to say, may be a lot of adjacent levels of gray eyes look identical. And eyes resolution per each are not identical. For display, the level of human recognition nature is the more the better, because the display image is, after all, give a person look. The brightness of the human eye can distinguish level, the more means that the display of color space, the greater the show colorful potential. Brightness identify class can use special software to test, general display can reach more than 20 level even better grades.

Three, brightness and the visual Angle of requirements:

Indoor full color LED display brightness to above 800 CD/m2, outdoor full color brightness is more than 6000 CD/m2, to guarantee the normal work of the screen, otherwise it will because the brightness is too low and can't see shown in the image. Mainly by the size of the brightness of LED tube core is good or bad decision. Viewing angles directly depends on the size of the LED display how many of the audience, and the bigger the better. Perspective is mainly determined by the tube core is encapsulated.

Is necessary to determine the brightness of the LED display, LED display of the current designs city-lighting brightness requirements, or new rules, the brightness of the LED screen is too high, will cause trouble to the nearby residents. In order to avoid the adverse reaction, which requires businesses in custom and maintenance of LED display need to have relevant professional knowledge.