RE: Surface Pro 323 May 2014 20:14
It almost certainly is Gorrila but yes it's possible that it was just assumed to be that. Quite understandable. OGS (One Glass Solution) which is what this seems to be has only ever been used in mobile size screens due to ITO's poor SNR (Signal to Noise Ratio). OGS has the X and the Y grids printed on the same side of the substrate... the under side of of the cover glass.
OGS reduces the thickness of display. It removes one of the layers of glass from the stack. The basic idea is to replace the touch module glass by a thin layer of insulating material. There are two ways to achieve this:
One approach to OGS is called "sensor on lens." (In this case, the "lens" refers to the cover glass.) You deposit an ITO layer on the back of the cover glass and pattern it to create the electrodes. You add a thin insulator layer to the bottom of that, and then deposit a second ITO layer on the back of that, patterning it to create electrodes running at right angles to the first layer. This module then gets laminated onto a standard LCD panel. The other approach is called "on-cell" (Here the "cell" refers to the LCD display.) A conductive layer of ITO is deposited directly onto the top layer of glass in the LCD panel, and then patterned into electrodes. A thin insulating layer is applied, and then the second ITO layer is patterned with the second layer of electrodes. Finally, the top polarizing layer is applied on top, and the display is completed by adding the top cover glass.
With OGS, the situation is even more complicated than with the on-cell touch structure. OGS integrates the touch ITO sensor circuits into the cover glass. There are two OGS methods, one a piece type, such as TPK’s “TOL” (touch on lens) and the other a sheet type, each using a different process. In both cases, the X-Y sensor patterns are on the same side of the substrate, therefore the sensor structure is called “SITO” (also known as “G2”). There are also some patent issues about this, with TPK, the leading touch panel maker, recently claiming that they have key SITO patents and suing Nokia and Chinese touch panel maker O-film. Whether AUO and Innolux can produce OGS SITO structures under TPK’s patent coverage is not clear. So, patent ownership, changing sensor structures, and business strategy all factor into whether Apple will change touch structures on their products.
Apple’s selection of sheet or piece type OGS is certainly a critical issue. In sheet type, the compressive strength (CS) of the cover glass is in the 500-600 Mpa range, because Corning’s IOX-FS and Gorilla glass, which have CS of 600-700 Mpa for smart phone sizes, cannot be used in sheet type. While piece type has a higher CS value, the mask stamping and alignment under photolithography are difficult, and the throughput may be low. Consequently, piece type could be difficult for AUO and Innolux.
So far, among the