Wide-viewing angle display device and fabrication method for thereof

A wide-viewing angle display device which is a multi-domain vertical alignment (MVA) mode liquid crystal display (LCD) device, comprising:

• an upper glass substrate and a lower glass substrate disposed parallel to each other;
• a liquid crystal layer of positive dielectric anisotropy formed in a space between the upper glass substrate and the lower glass substrate;
• a plurality of first common electrodes formed on the inner surface of the upper glass substrate;
• a plurality of second common electrodes formed on the inner surface of the lower substrate, in which the second common electrodes are positioned corresponding to the first common electrodes, respectively;
• a plurality of protrusions formed on the inner surface of the lower substrate, in which the protrusions and the second common electrodes are arranged alternately;
• and
• a plurality of pixel electrodes formed on the tops of the protrusions, respectively, in which the pixel electrodes and the second common electrodes are arranged alternately;
• wherein, after applying a voltage to the display device, a transverse electrical field is generated between the second common electrode and the pixel electrode to drive the liquid crystal molecules, and two alignment domains are formed at both sides of the protrusion.

A wide-viewing angle display device which is an in-plane switching (IPS) mode liquid crystal display (LCD) device, comprising:

• an upper glass substrate and a lower glass substrate disposed parallel to each other;
• a liquid crystal layer formed in a space between the upper glass substrate and the lower glass substrate;
• a plurality of first protrusions formed on the inner surface of the lower glass substrate;
• a plurality of second protrusions formed on the inner surface of the lower substrate, in which the first protrusions and the second protrusions are arranged alternately;
• a plurality of first electrodes formed on the tops of the first protrusions, respectively;
• and
• a plurality of second electrodes formed on the tops of the second protrusions, respectively, in which the first electrodes and the second electrodes are arranged alternately;
• wherein, after applying a voltage to the display device, a transverse electrical field is generated between the first electrode and the second electrode to drive the liquid crystal molecules.

A fabrication method for a wide-viewing angle display device, comprising steps of:

• providing a glass substrate;
• forming a protrusion layer on the glass substrate;
• patterning the protrusion layer to form a plurality of first protrusions and second protrusions, in which the first protrusions and the second protrusions are arranged alternately;
• forming a conductive layer on the glass substrate to cover the first protrusions and the second protrusions;
• and
• performing photolithography and etching to remove the conductive layer outside the tops of the first protrusions and the tops of the second protrusions, in which the remaining portion of the conductive layer on the top of the first protrusion serves as a first electrode, and the remaining portion of the conductive layer on the top of the second protrusion serves as a second electrode.