Touch sensor systems to improve the human interface
EM Microelectronic is today able to offer multiple custom touchscreen solutions.
The customization possibilities offered are wide and EM Microelectronic can combine such touchscreens in a Display Module or can supply the Touch module separately for applications on which a Display is not required.
Touch solution can be applied on transparent surface (glass) and on non transparent plastic surface.
For touchscreens on transparent surfaces the main focus of EM Microelectronic is to offer solutions with very high optical performances (non visible electrodes, high light transmission). With such goals the ideal technology is Capacitive touchscreens. Capacitive solutions can be also offered for Touch areas on Plastic (non transparent) surface.
Capacitve touchscreen on glass has high transparency (87-90%) and is more robust against external mechanical shock and stress than a Resistive touch.
Other Touch Technologies (like Resistive) can also be offered and combined in EM Microelectronic Display Modules.
The solution offered by EM Microelectronic consists of the sensor IC and the hardware interface (touch screen, cables, connectors,..etc) delivered in a complete and fully integrated customized module.
Touch Screen Technologies outlook
Capacitive: the touchscreen (glass, plastic,..etc) is coated with a conductive layer (normally ITO) that conducts a continuous electric current across a sensor on a specific ITO pattern. The human body acts as an electrical device changing the capacitance when touching the ITO layer on the screen with a bare finger (or a conductive device held by a bare hand) and the sensor detects the capacitance variation.
Capacitive touchscreen on glass has high transparency (87-90%) and is more robust against external mechanical shock and stress than a Resistive touch
Resistive: the touchscreen is coated with a thin metallic conductive layer and a resistive layer (normally ITO) that causes a change in the electrical current when a mechanical pressure is applied on the touch screen surface. The electrical current variation is detected by a controller. This type of touchscreen is today the most commonly used.
Resistive touchcreens are not able to reach high transparency (70-80% only) and the external touch surface can be damaged by sharp objects; however touchcreen panels are not affected by elements such as water, dust,..etc.
EM's Touch Modules are customer specific designs. As such we will take your particular request and engineer a solution to meet your requirements.
Typical lead times for a new Touch Module
■ 2 weeks to get the counter drawings
■ 8 to 10 weeks to get the samples after drawing approval
■ 9 to 12 weeks to get the first production after sample approval
EM's core strengths in LCD products are:
■ Quality & Flexibility
■ Lower price
■ Volume production
■ Synergy (with ICs, modules)
■ Technical know-how
■ Technical support
■ Special technologies
■ Manufacturing Network
■ European source
■ Credibility (Swatch Group, networking)
■ Credibility TS16494 / Avionic