to metaly:
我引一段 APPLE 關於 DVI 與 D-Sub 比較的文章供大家參考。

http://www.apple.com/displays/faq.html

What advantages does the digital graphics interface have over traditional display interfaces?
The digital graphics signal sent by the Power Mac to an Apple flat-panel display provides distortion-free images that are sharper than those on a CRT display or a flat-panel display with an analog interface. Here’s why: A CRT display requires an analog interface because it creates light and color from an electron beam. To create an analog signal for the CRT display from the digital data in graphics memory, the computer’s graphics controller must perform a digital-to-analog conversion, which can lead to image degradation. Because all the Apple flat-panel displays are digital devices, they do not require this conversion to analog form. A flat-panel display using an analog interface must go through yet another conversion from the analog to digital signal, which leads to even more possible distortion. Apple displays receive a distortion-free digital signal directly from the graphics controller. Not only does this mean that all the pixels are razor sharp from screen edge to screen edge, it also means that the screen never needs the kind of adjustments required for either a traditional CRT display or a flat-panel display using an analog interface.

我自己是覺得，D-Sub類比輸出的螢幕有些規格真的是非常好，但有的卻很糟糕。
但真正的問題是在於很難取得「標準」，很多人應該有這些經驗：換一張卡、換一條線、甚至換一部螢幕，結果顯示的畫質完全不同！
如同上面APPLE的文章所寫的。一但全面使用純數位訊號傳輸後，才能徹底解決這個畫質「標準」的問題，將問題簡化到剩下「面板的解析能力」。
而不是每天在那換卡、換線，結果各說各的好，還是沒有結論！
就這樣了
....