Main Problem to Achieve The Touch Function on PC

What is the main problem to achieve the touch function on PC?

The maximum size of  tablet computer is generally  10.1 inch, and the size of notebook computer  and super  thin notebook computer  is 13-14 inch, the size of PC display can reach more than 21 inch. The problem of PC touch screen which is as the same as  notebook computer’s  is that the pass rate drops down while the size goes up.
      Most touching PC we see  in current market are optical touch panels which border is thick and there is an obvious gap. Although the capacitive touch panel can reach 27 inch at maximum, the pass ratio is very low. Any size which is larger than 27 inch only can be adopted the optical sensing approach to ahieve  the touch function.

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