LEDs
If you recall the geometry, when we look at the scoreboard with a 60 degree angle, we see the same solid angle in 2 times more LEDs, which means the brightness of displays will not fall at the corners even more than 60 degrees to the normal. The form of LEDs is also of great importance to its brightness. LEDs for display are made oval and set horizontally. Boards should not shine into the sky, it's a waste of energy. The basic number of viewers watching the scoreboard right, or move right or left, so boards should have wide viewing angles horizontally and Small – vertically. The smaller pixel pitch boards, the more pixels are made of smd LEDs.
smd led takes up less space on the board, solder it easier and easier to take away the heat. However, the case smd LEDs – harder and consequently – more expensive. In addition, at present, smd LEDs rarely come with good oval lens. This is more costly led and makes its production unprofitable. The brightness of LEDs is measured in Kandell (cd) Brightness display – in nits (nits, nt).
For the production of graphic displays, using LEDs with a brightness of 5 cd. With decreasing pixel size, pixel brightness usually decreases. Brightness displays for use in the room is in excess of 500 nits, a street placard shall have the brightness of at least 3000 nits for the shady side and 6000 nits for solar. Placards with the brightness of more than 12000 nits do not. Very bright display blind eyes and their brightness have to reduce. Thus, in the screens coarse installed LEDs with a brightness of 3.1 cd and in the scoreboard with a fine pixel pitch – LEDs with a brightness of 200-600 mcd. For example, in the scoreboard with a step of 7.5 mm and a brightness of 10 000 nit brightness of a pixel – 560 mcd, and if a full-color displays, the brightness LEDs use less than 500 mcd, in addition, their brightness is reduced scheme of the module. Parameters of real LEDs have spread, the brightness in the same batch can vary by 30%, in addition, over time, the LEDs change their brightness (the effect of degradation). The service life of modern svetodidov not exceed 100,000 hours. In continuous operation is observed for 10 years, its brightness can be reduced by 2 times, the scatter intensity may increase. To scoreboard looked uniform in color and brightness, in the manufacture of boards, in its maintenance, calibration is performed. To be able to perform the calibration, the module's controller board should provide additional 'Calibration' brightness gradation. Calibration parameters are stored in memory controllers. We produce a graphical display of various types, monochrome, full color, with large and fine pitch, high brightness for the street, low – for indoor use.
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