What is my lcd density? How can I figure out what is my tablet's lcd screen density.

It is a cheapy one with no official site...

Is there any settings option I could check to see the display resolution configurations?
Is there any other way for it?
You probably have a diagonal screen size, and a resolution.  Use the Pythagorean Theorem on the resolution and divide the result by the screen size to get the DPI.

For example, my Vibrant is 4", 800x480.  sqrt(8002 + 4802) / 4 = ~233 dpi.