• Q: 若是在電源上很不容易達到白平衡，為何不使用藍色晶片 RG螢光粉的LED呢?NTSC也可以大幅提高，比起Blue chip Yag螢光粉更好.
• A: 但是藍色晶片RG螢光粉的LED因为有螢光粉会有老化的问题（Aging issues）而RGB背光没有老化的问题并且高效节能易達到白平衡.

• Q: 红/绿/蓝LED背光系统的设计成本会不会高，性价比如何？
• A: 1. RGB LED backlight cost is higher than that of WLED backlight. 2. Use RGB LED backlight will eliminate color filter, it will reduced cost around 20%, and the color gumat performance is better than that of WLED backlight around 40 ~ 50%.

• Q: 紅綠藍光LED為光源運用在手機是否也採用了色感測器與回饋控制器？利用這種背光源，是否取得了<0.02的色穩定性與持續的亮度穩定性？
• A: 是的,需要溫度感測器及回授.目標是做到< 0.003 delta(x,y)

• Q: lp552XLED驱动芯片的价位如何？如何买到？
• A: 在www.national.com網頁輸入產品編號,進入產品頁面,然後點撃samples & pricing,可見到一般價格及訂購產品的資料(點撃"BUY").

• Q: 能提供LED驱动样片吗？
• A: 樣品可以在網上訂購,有免費亦有要付費的.

• Q: 目前紅/綠/蓝LED背光方案是不是已经有了成熟的应用
• A: RGB LED backlight的應用是成熟的，目前大部份是使用在小尺寸的面板上，而在大尺寸面板上，市面上還沒有相關產品量產。除了單純RGB背光應，目前仍有其它應用，如FSC(Field Sequential Color) Display等。

• Q: 研討會還沒開始嗎? 沒有畫面變化及聲音??
• A: 請確認您的電腦是否裝有Flash播放器，或是重新整理您的頁面嘗試再次登錄收看。謝謝！

• Q: 请问，选择红/绿/蓝光LED背光，是否会加大系统的功耗？谢谢
• A: 如果单单从LED的功耗来看，没有经过优化的RGB背光的功耗比White LED多25-30%，使用优化过的LM5520的RGB背光的功耗比White LED只会多10-15%. 但LM5520的RGB背光可用Looser color filter，这样Color filter会节省20-40%。所以在系统中来看LM5520的RGB背光功耗与White LED差不多，但LM5520的RGB背光易達到白平衡，还有light throughput和light transmission改善很多

• Q: LED驱动器最大的驱动电流是多少？
• A: LP5520 have RGB 3 channel driver, each channel could drive 60 mA maximum.

• Q: 若是白平衡在紅光衰減時,利用LED Driver加強紅光電流,反而是加速紅光LED的老化,更快讓白平衡失效,在成本上的考量,會變的很高,尤其是在白平衡的控制
• A: 基本上選用的紅光LED電流規格只要在操作在規格,它的工作壽命並不會受到影響

• Q: Please compare CCFL and RGB LED power consumption?
• A: Currently, we focus on the comparison between RGB LED and white LED for mobile device LCD.Sorry, we don't have the data now.In general, CCFL need a high supply voltage, I think its power consumption is more large than WLED and RGB LED.

• Q: TFT-LCD 的結構圖可以在播完再顯示一次嗎來不及看到
• A: 這次演講明天可以在網頁上看到,演講的文檔pdf 可以在網頁下載.

• Q: 请问器件工作温度与湿度范围
• A: LM5520的operating ambient Temperature 是-30°C到+85°C。详细的Information在LM5520的datasheet中有。

• Q: will this characteristics curve change after running for a long time (aging effect?)
• A: Because we could use temperature sensor to do the color temperature compensation through internal EEPROM setting, the characteristics curve will not change after running for a long time.

• Q: 请问，红/绿/蓝光LED背光应用在手机显示器上有什么优点？
• A: color gamut較廣,如果用sequential method則功耗較小,且不需color filter.

• Q: How to reduce temperature on LED design?
• A: You can use PWM control and decrease LED current to reduce LED temperature.Of course, if want to get same luminous, you have to increase LED quantity.

• Q: how to get a copy of today's slide?
• A: Today's webinar will be archived. Tomorrow you will receive an email pointing you to a web page where you can listen to the webinar again and download the presentation file (in pdf format).

• Q: lp5520可以驱动多少功率？
• A: 3 channel for R/G/B each,每一channel可5 LEDs串聯,LED電流最大可達60mA

• Q: 本次研讨会的资料哪里有下载.谢谢.
• A: 這次演講明天可以在網頁上看到,演講的文檔pdf 可以在網頁下載.明天將有電郵通知.

• Q: Hi, can you explain a bit more about funciton of BRC in LP5520 on pg 7 in DS?
• A: BRC control可同時控制R/G/B 3個channel,這3 channel的PWM duty會相同且同步BRC的input