什麼是 LED driver ?

LED driver ，中文係LED驅動器，即係泛指所有用黎驅動(Drive)LED既器件，所以嚴格黎講，即使係一粒串聯既電阻都LED Driver。

LED 燈一定要用 driver 嗎?
呢個好視乎閣下既需要：如
閣下輸入既電壓係幾多？(220VAC市電?兩粒AA電池？還是USB直接供電？
需要驅動幾大火(即W)既LED?一粒普通既3mm/5mm LED?定係一粒3W，甚至5W既Luxeon K2 LED?
需要既效能(efficiency)幾多？無所謂？定係要求80%以上？
需唔需要好準確既顏色？
等等。
後話：
如果簡簡單單只係用黎做一個LED 面板，當然唔需要複習既線路，就咁串聯電阻就可以。
可以睇下人地點做
http://forum.hkepc.com/viewthread.php?tid=633350
複習既LED Driver就唔係咁簡單，可以睇下LED driver廠商佢地既資料學下先。

LED driver 為一提供constant current 之IC(周邊亦須接駁其他電子零件如線圈等)﹐以維持LED保持同一光度﹐而不會因電池電壓下降而降低。

簡單來說﹐通常要令一LED亮起﹐串聯一電阻及提供一恒定電壓已可。但對於portable device如手機﹐電池電壓會不斷下降﹐LED之亮度亦隨之下降﹐這樣當然不能接受﹗這時便須要LED Driver 去提供恒定電流。所以LED不一定要用driver﹐視乎應用而定。

Better to use "Driver", details as below:

A driver is an electrical device that regulates the power to an LED or string(s) of LEDs. What makes a driver different from conventional power supplies is that an LED driver responds to the ever-changing needs of the LED, or circuit of LEDs, by supplying a constant amount of power to the LED as its electrical properties change with temperature.

Think of an LED driver as 'Cruise Control' (like in a car) for the LED, and the temperature changes of the LED are the hills and valleys it is 'driving' over. The power level (or 'Speed') of the LED is maintained constant by the driver as the electrical properties change (amount of 'gas' or power needed) throughout the temperature increases and decreases (or 'hills and valleys') seen by the LED(s).

Without the proper driver, the LED may become too hot (driving too fast) and become unstabe (out of control), causing poor performance (engine problems) or complete failure (crash!)

LED 燈不須要用 Driver,應該係加咗IC,所以要用Driver.
加IC係想LED閃動,如LED數字顯示版.