thank you, ubercake, your post has been helpful.
This digital TV has the following input: 4 HDMI, 2 component, 1 AV, 1 USB, 1 VGA, 1 RF antenna.
I now agree that HDMI is not the choice to use in computer display. But isn't HDMI and DVI inter-changeable? There are passive converter adapter to/from DVI and HDMI, correct?
Well, I tried the VGA port. I select VGA graphic instead of VGA video. The screen looks much better than HDMI. However, the white background is still much too bright. My setting brightness 32, contrast 70, seems to show the best on text readability.