Patent ID: 8134537

Claim:
A touch display panel, comprising: a first substrate, comprising a plurality of sensing areas and a non-sensing area located outside the sensing areas, wherein the first substrate comprises a plurality of first electrodes respectively within each of the sensing areas; a second substrate, disposed oppositely to the first substrate, wherein the second substrate comprises: a plurality of main spacers, disposed at a surface of the second substrate facing the first substrate, wherein the main spacers are connected to the non-sensing area of the first substrate; a plurality of sensing protrusions, disposed at the surface of the second substrate facing the first substrate and respectively corresponding to the sensing areas of the first substrate, wherein each of the sensing protrusions has a second electrode disposed thereon and there is a sensing gap between the first electrode and the second electrode at each of the sensing protrusions; a plurality of first sub-spacers, disposed at the surface of the second substrate facing the first substrate and corresponding to the non-sensing area of the first substrate, wherein there is a first sub-spacer gap between the first substrate and each first sub-spacer of the second substrate; and a plurality of second sub-spacers, disposed at the surface of the second substrate facing the first substrate and corresponding to the non-sensing area of the first substrate, wherein there is a second sub-spacer gap between the first substrate and each second sub-spacer of the second substrate, and the first sub-spacer gap is less than the sensing gap and the sensing gap is less than the second sub-spacer gap; and a liquid crystal layer, disposed between the first substrate and the second substrate.