Custom Touchscreens

Capacitive and resistive solutions

Touchscreens have revolutionized the market of input devices and Hoffmann + Krippner offers capacitive and resistive touch technology.

High-performance, robust touchscreen solutions (both capacitive and resistive) can fulfill any special requirements in the most advanced and forward-looking input devices and operating units. The technology has opened new avenues regarding design options in consumer and industrial products.

Touchscreens make device interaction easy and pleasing for users; it’s no wonder they have become so popular for so many applications, ranging from industrial automation to medical technology, from consumer devices to information terminals.

Combined with Hoffmann + Krippner expertise, touch technology can provide the perfect finishing touch to your products.

Knowledgeable experts at Hoffmann + Krippner can support you in crafting your product at all stages, from initial design and prototyping through full production.

We can customize our standard touch screen offerings to meet a huge array of functional and design variations. We offer touchscreens as an individual component or integrated into your device with complete electronics. Our engineers have the experience and technical expertise to help determine the best way to use touchscreens or other input technologies to optimize your product to delight your customers.

Industry-leading products, best-in-class experts, and a world-class reputation: with Hoffmann + Krippner’s magic touch, we can turn your application into a unique, high-quality, highly successful product.

Learn more about:

> Custom Resistive Touchscreens
> Custom Capacitive Touchscreens
> Optical Bonding


Ready to get started?

Please contact us today to start developing your custom membrane switch for the ultimate man-machine interface experience.

Custom Resistive Touchscreens – Response to Pressure

Resistive touchscreens are mechanically activated by the application of pressure.

It’s a simple, reliable, and affordable screen input technology that can work with stylus and gloves, with high electrical reliability, at low cost. For that reason, resistive touchscreens are still popular for industrial applications.

How does it work?

The resistive touch screens by Hoffmann + Krippner consist of transparent, conductive, cushioned layers. Even light pressure applied to the screen surface triggers the operating function. A small controller unit monitors the touch screen and relays the key actuation; the connected computer always knows where something is happening on the screen and can react accordingly – with precision down to the millimeter.

Resistive Touchscreen Advantages

> Operation possible with heavy work gloves
> Precise control when using a stylus
> Less electromagnetic interference due to mechanical operation
> Currently lower priced compared to capacitive systems

Resistive Touchscreen Disadvantages

> Only single-touch operation is possible with conventional resistive systems
> Gesture control is very limited
> Wear due to mechanical stress during operation
> Surfaces are sensitive, so not suited for devices vulnerable to vandalism

Applications for Resistive Touchscreens

Due to the simple design, usability with a stylus and gloves, high electrical reliability and low cost, resistive technology is still widely used. Among others, it is used in:

> Industrial-PCs
> Office equipment (e.g. photocopiers)
> Household appliances (e.g. coffee makers)
> Hand control devices (e.g. car diagnostic)
> Input devices in medical technology

As controls in these application areas do not need to master complex gestures and multi-touch operations, the advantages of resistive technology commonly outweigh the disadvantages.

Custom Capacitive Touchscreens – Response to Touch

Capacitive input technologies are the de facto standard in consumer electronics, widely used in smart devices and other touch interfaces. Moreover, capacitive touchscreens are enormously varied and flexible, all depending on customer needs: single or multi-touch, anti-reflective or tempered glass, printed or transparent surfaces, flat or curved – this technology is endlessly accommodating.

How does it work?

Hoffmann + Krippner offers different types of capacitive touch screens, though the most common are so-called Project Capacitive Touches (PCT or PCAP):

> PCTs consist of two isolated conductive layers stacked on each other.
> They are printed with a manufacturer-specific pattern (basically numerous small capacitors).
> When the finger approaches or touches the interface, electrical charge is withdrawn from the circuit; the screen detects that as a contact.

The advantage of PCT (when compared to the surface capacitive touches) is that the touch sensor may be mounted on the back of the cover glass, with the capacitive areas projected through the glass. As a result, this technology provides a more durable construction that can effectively prevent vandalism.

Capacitive Touchscreen Advantages

> Multi-touch with up to ten fingers
> Very durable, barely exhibiting any wear and tear
> Application range and reliability increases tremendously with better controller or device-specific programming
> With appropriate components, the equipment can be operated in the harshest conditions (protected against vandalism, temperature, humidity)

Capacitive Touchscreen Disadvantages

     > Can only be operated with bare fingers or thin latex gloves (no heavy work gloves)
     > Specific conductive pins required since a capacitive screen will not detect a conventional stylus
     > Electromagnetic fields, moisture, or extreme temperature fluctuations can cause malfunctions

Applications for Capacitive Touchscreens

Due to the innovations in input devices in the consumer sector – smartphones, tablets, etc. – the acceptance of the capacitive technology has increased in other areas. Further, the technology-related deficits – e.g. electromagnetic interference, humidity and temperature fluctuations – can usually be corrected or alleviated through a combination of software and hardware adjustments. Among others, capacitive input devices are now used in the following areas:

> Smartphones
> Tablet PCs
> Industrial PCs
> Household appliances (e.g. washing machine, dryer)
>Control panels (e.g. public transportation)
> Input devices in the public sector

Optical Bonding

Ensure a clear view into the touchscreen.

Particularly bright environments can massively affect the readability of electronic displays. Optical bonding is the full-surface bonding of touchscreens, displays and glass. The common air gap between the cover glass or a touchscreen and the display behind it leads to annoying reflections and the picture loosing its brilliance. A special manufacturing technique – optical bonding – fills the air gap with a high-quality transparent adhesive to eliminate the gap, ensuring a clear view.

Benefits of Optical Bonding:

> Offer a clear and brilliant image in bright or poor lighting conditions, even after years of operation
> Eliminates the air gap to prevent moisture, condensation and dirt from gathering
> Protects further against temperature fluctuations and mechanical stress
> Prevents crack in the front glass, held together by the adhesive, from immediately shattering; this minimizes the risk of injury to the operator


We use two of the tried and tested adhesive techniques for optical bonding. Liquid bonding, also called LOCA, is used to marry rigid surfaces. Laminating with sheet glue, also called OCA, can be used to connect flexible surfaces. Both processes are carried out under cleanroom conditions in order to prevent air and dust inclusions.

LOCA (Liquid Optical Clear Adhesive)

A highly transparent liquid adhesive is used in the LOCA process. The adhesive is usually spread on the cover glass and then bonded with the touchscreen or display without air pockets using a special process. The adhesive is cured with UV light and allows the components to fuse into one unit. This adhesive process is mainly used to connect rigid assemblies (glass, touch, display).

OCA (Optical Clear Adhesive)

The OCA process is carried out by laminating a highly transparent sheet adhesive. This bonding process is used to connect both rigid and flexible assemblies (foils / membrane switches) with touchscreens or displays. Parts of the process take place in a vacuum environment in order to achieve a bubble-free bond.

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