Touchscreen

Luphi Electronics specializes in designing and manufacturing touchscreen products, providing a range of solutions tailored to various needs. Our offerings include touchscreens integrated with membrane switches, graphic overlays, rubber keypads, PCBAs, touch switches, and intelligent user interfaces.

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What is Touchscreen？

A Touchscreen, also known as a touch panel (TP), is an information input device that enables human-computer interaction through touch sensor technology. Based on their working principles, touchscreen can be categorized into resistive, capacitive, optical, ultrasonic, and electromagnetic induction types. Capacitive touchscreen, known for their high sensitivity, good transparency, strong stability, and long lifespan, support multi-touch functionality and are currently the mainstream technology. They are widely used in smart consumer electronics, industrial control medical equipment, smart home devices, office equipment, automotive electronics, and other fields. From different technical routes, capacitive touchscreen can be divided into external and embedded types. The basic structure of external capacitive screens separates the touch panel from the LCD panel, with two main solutions: film-based and glass-based, differing in the carrier of the touch layer. Embedded capacitive screens integrate the touch panel and LCD panel, with main types being In-Cell and On-Cell. Compared to external structures, embedded capacitive screens are lighter, thinner, and have higher transparency.

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Touchscreen display featuring NFC technology for seamless connectivity.

The Main Types Of Touchscreen Are As Follows

Capacitive Resistive Touchscreen Panels With FPC Circuit Aluminum Material

Resistive Touchscreen: Including four-wire, five-wire, and eight-wire resistive touchscreen, these work through pressure sensing. They are not affected by dust or moisture and can be touched with any object, making them suitable for industrial control and office environments with limited use. The advantages of resistive touchscreen include lower cost, but they require significant pressure to activate and have a relatively shorter lifespan.

Capacitive Touchscreen: These work by sensing the electrical current of the human body and can only be touched with specific conductive materials (such as fingers). Capacitive touchscreen offer faster response and higher sensitivity but are not suitable for use with non-conductive objects. Subcategories of capacitive touchscreen include surface capacitive and projected capacitive, with projected capacitive screens having stronger durability and wear resistance.

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Infrared and Surface Acoustic Wave Touchscreen: These technologies are also common. Infrared touchscreen detect touch positions through an infrared matrix, while surface acoustic wave touchscreen use sound wave sensors. Each technology has its characteristics, such as infrared touchscreen being unaffected by multi-touch and surface acoustic wave touchscreen having high transparency and clarity.

Touchscreen for Special Environments: Industrial touchscreen are categorized by their internal structure and function, including those embedded with Windows systems and various manufacturer-integrated types. These touchscreen perform well in extreme environments like high or low temperatures and dusty conditions, featuring high stability, long lifespan, and wear resistance.

Resistive screens primarily use the ADC module of a processor to collect data, while capacitive screens delegate this task to a touch IC, allowing the processor to obtain touch data through a communication interface. Choosing the right touchscreen solution depends on key functional requirements, budget, durability, and usability considerations.

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Infrared and Surface Acoustic Wave Touchscreen

Industrial Transparent Touchscreen Panels

How Should Customers Choose a Touchscreen?

Terminal customers need to focus on the following when selecting a touchscreen:

Debugging Workload After Size Replacement

Replacement Screen Cost Due to Supply Changes

For resistive screens, which use the processor's internal ADC module (or an external ADC chip), changing the model or size can be done as long as the working voltage and current are similar to the original plan. However, for complex tasks like multi-touch and gesture recognition, resistive screens are clearly inadequate.

For capacitive screens, which use communication interfaces like I2C or USB, the internal communication protocol is designed by the screen manufacturer, leading to significant impact on the driver, primarily in the following areas:

Kernel version, communication protocol interface, driver kernel environment, and driver version. Kernel version changes can result in modifications to some kernel APIs, rendering the driver incompatible.

Hardware IC upgrades might change some register values.

Once the driver is modified, it creates issues in the production process, requiring maintenance of multiple product firmwares.

Therefore, when selecting a capacitive screen solution, it is crucial to consider the overall supply chain and production process control capabilities.

In summary, resistive screens are suitable for complex industrial production environments or medical environments where onsite personnel can wear gloves or use other tools for touch. Capacitive screens are more suited for high-end, consumer-oriented environments, supporting multi-touch and more complex application functions.

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Industrial Resistive Touchscreen Panels With Human Machine Interface

A Customer’s Words Mean More Than Ours

Of course , I am an Electronic designer, after we design our own electric circuit and graphic overlay , so we ask our business partner , luphitouch, to complete our designing conception, they can finish our task perfectly, thanks for them very much !

Jassica Mara
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The most of our membrane switches are from LuphiTouch, their quality is so well , delivery time is rightly , but also our client feedback his control panel is so easy and convenient to operate, of cousre , we like them so much !

Robin Ton
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I am happy that I can introduce our good supplier to everyone. We freqency buy some membrane switches and printed electric circuit and graphic overlay from luphitouch, although I haven't a new order every month, we feel their service is so good !

Henry Sam
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I trust our business partner very much, that is Luphitouch , I have visited their factory four times, their workshop is clear , and dity, and have an around production management system, I have a ease rest that our product can be produced in this factory !

Magar Faw
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