Method for cutting tempered glass and preparatory tempered glass structure

1. A preparatory tempered glass structure for a cutting treatment, comprising:

a glass substrate given a strengthening treatment to form, from a surface to the inside of the glass substrate, at least one compression stress layer and a tensile stress layer corresponding to the compression stress layer, wherein the glass substrate has a bottom surface and a top surface opposite the bottom surface;

a first trench formed on the top surface and in the compression stress layer of the glass substrate without splitting the glass substrate to remove a part of the compression stress layer and correspondingly reduce a tensile stress along the first trench;

a second trench formed on the bottom surface and in the compression stress layer of the glass substrate without splitting the glass substrate to remove a part of the compression stress layer and correspondingly reduce a tensile stress along the second trench; and

a scribe line formed in the first trench or the second trench to initiate the cutting treatment and define a cutting path for the cutting treatment.

2. The preparatory tempered glass structure as claimed in claim 1 , wherein the depth of the trench is substantially larger than the thickness of the compression stress layer.

3. The preparatory tempered glass structure as claimed in claim 1 , wherein the glass substrate is given an ion exchange glass strengthening treatment.

4. The preparatory tempered glass structure as claimed in claim 1 , wherein the trench is formed by etching or polishing.