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Company News >> On - cell LCD Jedi counterattack embedded touch panel 24th,July,2017

In the touch chip manufacturers and panel factory co-operation, On-cell LCD embedded touch technology has successfully break through the single-layer multi-point pattern design level, and began to rely on low-cost advantage in the low-end smart phone market siege , Is expected to break today's In-cell and On-cell AMOLED dominated embedded touch market situation.

Since the touch panel has become the main man-machine interface for mobile devices, almost all panel makers are eager. The panel conceptally believes that the touch sensor (TouchSensor) into the panel, not only can reduce the stack (Stack) thickness, but also can save material costs. Therefore, since 2008, in the major panel factory in the future product blueprint, you can see the embedded (EmbeddedType) touch panel design.

However, the embedded touch panel has not been mainstream; until Samsung (2010) will be advanced active matrix organic light-emitting diode (SuperAMOLED or On-cellAMOLED) used in the GalaxyS series, Apple (Apple) in 2012 Year will be its own patented embedded touch (In-cell) technology through three panel makers foundry, the embedded touch panel has finally been the attention of the market. But in addition to Samsung and Apple these two smart phone leading brand, the other brands are not enthusiastic. However, in 2013, the embedded touch panel for the panel factory rekindled hope; the current technical maturity, market acceptance and supply chain for the embedded touch panel provides a better environment for the development.

Projection Capacitors leap in embedded touch panel technology mainstream

Early panel manufacturers in the development of embedded touch panel, can be classified as about three technologies: optical (PhotoSensing), capacitive (ChargeSensing) and voltage (VoltageSensing), but these three technologies are actually no real production And some in the touch when the need to force the panel, resulting in deformation, so that is not easy to import protective glass design, and ultimately can not be accepted by the market. Gradually, the panel factory on the touch technology recognition in the projection capacitor has been a consensus, and projection capacitor since the 2007 Apple iPhone into, has replaced the original resistance, a touch technology mainstream. Panel makers may have finally learned that panel display and manufacturing technology is not equivalent to touch technology, touch noise interference processing and judgment gestures of the algorithm is not their expertise.

So far, almost all of the production of embedded touch panels are using projection capacitor technology. Touch technology has a consensus, but the sensor (that is, the electrode) of the placement position is quite different. The general LCD panel will have two glass up and down, the top of the glass is to create color filters (color resistance), and the bottom of the purpose is to thin film transistor line; therefore, the induction electrode placement is in the two pieces of glass on. For the definition and description of the location and there is no common standard, but conventionally that the electrode if the bottom of the glass as In-cell, in the top of the glass is On-cell; and if not on the two pieces of glass is Out- Cell, that is, the so-called "plug-in (Add-onType)".

The more controversial is the application of On-cell in LCD panels. Usually the sensing electrode will be placed on the top of the upper glass (that is, the face of the user's eyes), because the bottom of the filter color resistance, and the electrode is in the polarizing film below. However, some panels or control chip manufacturers practice the electrode line is placed in the black matrix area between the black matrix (BlackMatrix), the electrode material can be indium tin oxide (ITO), metal wire or even metal mesh (MetalMesh). In this stack, because the electrode lines face the liquid crystal layer, so some manufacturers call it In-cell. In any case, this is only a matter of their own definition, the industry does not strictly determine the standard.