touch screen technology that reduces the display thickness
summary
How to keep the thickness as thin as possible while ensuring the function is our constant goal, and this effect can be achieved by using OGA technology and SLOC technology.
Thickness is an important indicator for tft display, it will affect the design of the whole product, it is likely that the product you designed cannot be realized because of a small size. Thanks to the compact structure of the led backlight, the thickness of the tft display can be made relatively thin. For example, the thickness of a 5.5-inch tft display module with a resolution of 720×1280 is 1.2mm. However, the thickness will increase a lot after adding a touch screen. Usually used the thickness of the cover lens is 0.7mm~1.2mm. If stronger protection is required, the cover lens will be thicker. Touch screen technology has a great influence on the thickness of pcap display.
Which touch screen technology that reduces the display thickness?
We have an article that introduces the structure of the touch screen in detail. The touch screen is composed of cover lens, sensor film or sensor glass, OCA or adhesive tape. If you want to reduce the display thickness, combining some of the materials is a better way. There are two similar touch screen technology can reduce the display thickness: OGS(on glass sensor) touch screen technology and SLOC ( single layer on cell) touch screen technology
OGS is the abbreviation of on glass sensor. This technology is to make the sensor directly on the cover lens, which saves the sensor film or sensor glass and a layer of OCA, thereby reducing the display thickness.
OGS touch screen technology has no size limit, since the cover lens can withstand higher temperature, it can make touch screen with double layer touch sensor to achieve better performance.
SLOC is the abbreviation of single layer on cell. It is similar to OGS. The difference is that SLOC is to make the touch sensor on the surface of the LCD panel. This technology was first proposed by Focal Tech and mass-produced. This technology is in the completion of the LCD panel. After production, the internal materials of lcd panel such as liquid crystal and color filter cannot withstand high temperature, so low temperature ITO thin film technology is used. The resistance of the low-temperature coating process is relatively large, so SLOC is more suitable for small-sized products.
OGS touch screen production process
The ITO film layer is plated on a glass substrate or a film substrate, and the glass substrate can withstand high temperatures to obtain better performance.
ITO film layer is coated with photosensitive resin
The photosensitive resin is covered with a MASK for exposure
Remove excess photosensitive resin after development
Remove excess photosensitive resin after development
Coated with a photosensitive resin for insulation
Coated with a photosensitive resin for insulation
Remove excess insulating resin after development
The metal layer is covered on the substrate
The metal layer is coated with a photosensitive resin
Use MASK to cover the photosensitive resin for exposure
After exposure, development process is performed to remove the decomposed photosensitive resin
The developed substrate was etched to remove the excess metal layer
Remove excess photosensitive resin and finally get OGS touch screen
OGS and SLOC touch technologies can reduce the display thickness, but they also have their own shortcomings, such as high initial investment and relatively long production cycle. If you need a custom touch screen, please contact us,
