Introduction of Bezel Free PCAP Touch Monitor

Bezel free PCAP touch monitors are further divided into self-capacitance and mutual capacitance, or ITO and metal (depending on the electrode material). Surface capacitance touch screens use a sheet of ITO with at least four electrodes around its periphery to calculate the x and y coordinates of the touch point. These electrodes sense changes in surface capacitance when an object, such as a finger, approaches. This method is mainly used in entertainment applications, is expensive and noisy, and does not support multi-touch functionality.

In the functionality of bezel free PCAP touch monitor, each string of x-axis (Rx) electrodes is connected to the substrate of the y-axis (Tx) drive lines. The electrodes of the x and y axes can be patterned from the upper (horizontal) or more layers (vertical). Intersections need to be isolated by insulators, with each intersection becoming the x, y coordinates. bezel free PCAP touch monitors support multi-touch functionality. Multi-touch has been developed since the 1980s, but it wasn't until the release of the iPhone in 2007 that the technology became commercial. Apple Inc. developed this technology, but Fingerworks produced the first multi-touch product in the late 1990s (Fingerworks was acquired by Apple Inc. in 2005). Most touch screen panels are 10-point multi-touch screens. However, at the 2013 International Consumer Electronics Show, 3M showcased its 40-point multi-touch technology.

Self-capacitance and Mutual Capacitance In Bezel Free PCAP Touch Monitors

The self-capacitance touch screen technology of bezel free PCAP touch monitors measures capacitance changes using an electrode per pixel. Thus, only one electrode layer is required. By using only one electrode layer, self-capacitance related production costs are low, the signal-to-noise ratio (SNR) is high, and the side bezel is relatively thin. However, this method is rarely used due to its tendency for multi-touch ghosting and complex electrode wiring.

The mutual capacitance sensors of bezel free PCAP touch monitors feature an x-y grid that can accurately measure the capacitance changes at each grid location. Many touch screen panel manufacturers use mutual capacitance sensors because they do not have ghosting issues, and the electrode wiring is simple. As one of the reliable and professional PCAP touch screen manufacturers, our products are durable and highly efficient, providing an excellent user experience.

Layer Structure Of Bezel Free PCAP Touch Monitors

The Tx and Rx electrode patterns are on different layers. bezel free PCAP touch monitors can have various stacked structures depending on the location, materials, and methods of layer formation. Tx and Rx electrodes must be conductive materials. However, metal cannot be used for electrodes located in the active display area. Currently, ITO transparent conductive material is the preferred electrode material for most display panels. ITO is made by adding SnO2 to indium oxide to improve conductivity. Meanwhile, the use of metal mesh and nano silver wires is also increasing. However, ITO remains preferred due to its higher transparency compared to metal.

The stacked structure of bezel free PCAP touch monitors is divided into three categories: 1) glass stacking (electrodes on a glass substrate), 2) film stacking (electrodes on a plastic substrate or film), and 3) electrode integration. The creation of glass and film layers is further divided into: 1) the add-on method, which requires a layer between the display panel and cover glass, and 2) OGS, where the glass cover includes electrodes. Currently, the add-on method is widely used, but OGS and electrode integration methods are expected to gain popularity in the future as they reduce costs and can produce lighter and thinner panels.

The stacked structure of bezel free PCAP touch monitors depends on the application and price. The glass stacking method is divided into GG (SITO), GG (DITO), and G2 (OGS), while the film stacking method includes GFF, G1F, GF2 (DITO), in-cell, and on-cell integration methods. While each method has its advantages and disadvantages, film stacking is more favored over the add-on method in glass stacking. Regarding the glass stacking method, investment is leaning towards the G2 (OGS) method.