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FAQs — Frequently asked questions

Project request
Technical ques­tion

Do you have any ques­tions? We have the answers! In our FAQs you will find an overview of the most fre­quently asked ques­tions about our prod­ucts, ser­vices and processes. If you can’t find the right answer here, please don’t hes­i­tate to con­tact us directly — we’ll be happy to help you. 

General questions

We are your part­ner for inno­v­a­tive HMI solu­tions and offer you cus­tomized prod­ucts, and what’s more — every­thing from a sin­gle source.

Sie kön­nen uns direkt über unser Kontaktformular oder per E‑Mail kon­tak­tieren. Teilen Sie uns die Details Ihres Projekts mit, und wir erstellen Ihnen ein indi­vidu­elles Angebot.

Order process and delivery

The deliv­ery time depends on the com­plex­ity of your project and the avail­abil­ity of the com­po­nents. Our team will inform you of the exact time frame when you con­firm your order. 

Yes, we offer flex­i­ble solu­tions that also include small series and prototypes.

Technical support

Yes, our team will sup­port you with all tech­ni­cal ques­tions about our prod­ucts and their inte­gra­tion into your systems.

Naturally. EP Electronic Print spe­cial­izes in tailor-​made solu­tions and devel­ops HMI com­po­nents that per­fectly match your requirements. 

Product-​related questions

Unser Portfolio umfasst HMIs, Touchscreens, Displays, Tasten, Rechnerboard, Folientastaturen, Covergläser, Trägerplatten und Gehäuse, die speziell auf Ihre Anforderungen angepasst wer­den können.

Wir set­zen auf mod­ern­ste Technologien wie Optical Bonding, Air Gap Bonding, Laminieren, Prägen, Laserschneiden, Metallbearbeitung wie Eloxieren oder Pulverbeschichten, Bedruckung im Sieb- oder Digitaldruck, 3D-​Druck, Leiterplatten-​Bestückung SMD oder THT, geschlossene Oberflächen und vieles mehr um Ihnen qual­i­ta­tiv hochw­er­tige Lösungen zu bieten.

A multi-​touch dis­play is a touch­screen that can rec­og­nize sev­eral simul­ta­ne­ous touch points. This tech­nol­ogy is based on the recog­ni­tion of fin­ger touches, which are mea­sured using dif­fer­ent phys­i­cal prin­ci­ples such as capac­i­tance, resis­tiv­ity or infrared sen­sors. With capac­i­tive touch­screens, the fin­ger is rec­og­nized as an elec­tri­cally con­duc­tive mate­r­ial, which causes a change in the elec­tri­cal field of the dis­play. These changes are detected by sen­sors on the screen sur­face and the exact posi­tion of the touch is determined. 

Capacitive, resis­tive and opti­cal touch tech­nolo­gies are mainly used for multi-​touch displays:

Capacitive touch­screens use the change in the elec­tri­cal field on the screen sur­face to rec­og­nize touches. They are gen­er­ally more accu­rate and respon­sive and allow a greater num­ber of simul­ta­ne­ous touches. 
Resistive touch­screens con­sist of two lay­ers that come into con­tact with each other when pres­sure is applied. They are less pre­cise and do not offer a high num­ber of simul­ta­ne­ous touches, but are more robust and less expensive. 
Optical touch­screens use infrared rays and cam­eras to detect the posi­tion of touches. They are less sen­si­tive to scratches and offer greater transparency. 

Capacitive multi-​touch dis­plays offer sev­eral advan­tages com­pared to resis­tive touchscreens:

Better reac­tion speed and pre­ci­sion, as they do not require mechan­i­cal move­ment but react to elec­tri­cal signals.
Recognize mul­ti­ple touch points, enabling ges­tures such as pinch-​to-​zoom or mov­ing mul­ti­ple objects at the same time.
Longer ser­vice life as no mechan­i­cal parts are used.
Better image qual­ity due to the higher trans­parency of the capac­i­tive material.

The num­ber of simul­ta­ne­ous touch points that a multi-​touch dis­play can detect depends on the tech­nol­ogy used and the imple­men­ta­tion. Modern capac­i­tive touch­screens can rec­og­nize up to 10 touch points simul­ta­ne­ously, which enables pre­cise han­dling of ges­tures such as zoom­ing or rotat­ing appli­ca­tions. In some cases, such as larger inter­ac­tive dis­plays, the num­ber can be higher. 

The sen­sor res­o­lu­tion is cru­cial for the pre­ci­sion of a multi-​touch dis­play. A higher res­o­lu­tion means that the dis­play has more sen­sor ele­ments per unit area, which leads to more accu­rate detec­tion of the touch posi­tion. This is par­tic­u­larly impor­tant in appli­ca­tions that require high accu­racy, such as graphic design or med­ical diag­nos­tics. A high res­o­lu­tion also ensures that inter­ac­tion with the dis­play is smoother and less laggy. 

Most mod­ern multi-​touch dis­plays are based on capac­i­tive tech­nol­ogy, which uses the prin­ci­ple of chang­ing the elec­tri­cal field:

Capacitive tech­nol­ogy mea­sures the change in capac­i­tance caused by the approach of a fin­ger to the screen. This change is detected by a matrix of sen­sors that deter­mine the exact posi­tion and inten­sity of the touch. 
Resistive touch­screens are based on the prin­ci­ple of resis­tance change, which occurs when pres­sure is applied to the screen and two con­duc­tive lay­ers come into con­tact with each other.
Optical sys­tems use infrared beams and cam­eras that are pro­jected onto the screen sur­face. Touching inter­rupts or reflects these beams, which deter­mines the posi­tion of the touch. 

The accu­racy of a multi-​touch dis­play depends on sev­eral factors:

Sensor type and den­sity: The more sen­sors there are on the screen, the more pre­cisely the posi­tion of each touch can be detected.
Signal pro­cess­ing: A pow­er­ful proces­sor for pro­cess­ing the touch data ensures that the inputs are imple­mented cor­rectly and with­out delay. Multi-​touch tech­nolo­gies use spe­cial­ized algo­rithms to cal­cu­late the exact posi­tions and num­ber of touches. 
Calibration: Some dis­plays require cal­i­bra­tion to opti­mize accu­racy, espe­cially opti­cal touchscreens.

The biggest tech­ni­cal chal­lenges include

Precise sen­sor inte­gra­tion: To ensure high accu­racy, the sen­sors must have a high den­sity and accu­racy with­out increas­ing the cost and thick­ness of the display.
Signal pro­cess­ing: The abil­ity to rec­og­nize mul­ti­ple touch points simul­ta­ne­ously and process the inputs in real time requires pow­er­ful and effi­cient hardware.
Haptic feed­back: Multi-​touch dis­plays do not pro­vide phys­i­cal feed­back like mechan­i­cal but­tons, which increases the chal­lenge of user inter­ac­tion dur­ing pro­longed use. Visual or acoustic sig­nals are often used. 

Multi-​touch dis­plays can be affected by var­i­ous envi­ron­men­tal influences:

Moisture: With capac­i­tive touch­screens, mois­ture can affect the con­duc­tiv­ity of the dis­play and reduce recog­ni­tion accuracy.
Temperature: Extreme tem­per­a­tures can affect the respon­sive­ness of touch­screens. Cold tem­per­a­tures can increase the sen­si­tiv­ity of resis­tive touch­screens, while high tem­per­a­tures can slow down the response time. 
Foreign sub­stances: Dust, dirt or fin­ger­prints on the sur­face of a dis­play can reduce the recog­ni­tion rate, espe­cially with capac­i­tive touch­screens that rely on the con­duc­tiv­ity of the body.

Multi-​touch dis­plays are ideal for gesture-​controlled user inter­faces due to their abil­ity to rec­og­nize sev­eral touch points simultaneously:

Gestures such as zoom­ing, rotat­ing or swip­ing are made pos­si­ble by the simul­ta­ne­ous recog­ni­tion of sev­eral touches.
Multifunctional inter­ac­tion: Users can per­form sev­eral actions simul­ta­ne­ously with one hand, e.g. scrolling with one fin­ger and zoom­ing with two fingers.
Intuitive oper­a­tion: Multi-​touch tech­nol­ogy pro­vides a nat­ural, human-​like inter­ac­tion with the device that opti­mizes the user expe­ri­ence, espe­cially with graph­i­cal user inter­faces and inter­ac­tive applications.

LCD (Liquid Crystal Display): LCDs use liq­uid crys­tals that sit between two lay­ers of polar­iz­ing fil­ters and a back­light. They require sep­a­rate light­ing (usu­ally LEDs) to make the image visible. 
LED (Light Emitting Diode): LED is not a dis­play tech­nol­ogy in its own right, but describes the illu­mi­na­tion of dis­plays. In LED back­light LCDs, LEDs pro­vide the back­light for the LCD panel. 
OLED (Organic Light Emitting Diode): With OLEDs, each pixel is illu­mi­nated by an organic layer that gen­er­ates light itself, so no back­light is required. OLEDs offer deeper blacks and higher con­trasts as indi­vid­ual pix­els can be switched off. 

Die Auflösung eines Displays beschreibt die Anzahl der Pixel, die es darstellen kann. Sie wird in der Regel als Anzahl der hor­i­zon­talen und ver­tikalen Pixel angegeben (z.B. 1920x1080 für Full HD). Höhere Auflösungen wie 4K (3840x2160) bieten mehr Details, was beson­ders bei größeren Bildschirmen oder bei der Arbeit mit hochau­flösenden Inhalten von Vorteil ist.rungspunkte gle­ichzeitig zu erken­nen, ideal für gestenges­teuerte Benutzeroberflächen:

IPS (In-​Plane Switching): Provides bet­ter color accu­racy and wider view­ing angles than other tech­nolo­gies. It is well suited for appli­ca­tions where color fidelity and wide view­ing angles are required. 
TN (Twisted Nematic): These pan­els have fast response times and are inex­pen­sive, but offer lim­ited view­ing angles and poorer color accuracy.
VA (Vertical Alignment): VA pan­els offer bet­ter con­trast and deeper blacks than IPS and TN, but the view­ing angles are some­what more lim­ited. They are well suited for movies and games where con­trast plays a greater role. 

Do you have any fur­ther questions?

Kontaktieren Sie uns direkt – unser Team hilft Ihnen gerne weiter!

Everything from a single source

Why EP Electronic Print?

At EP Electronic Print, we rely on state-​of-​the-​art com­po­nents and tech­nolo­gies to develop inno­v­a­tive and cus­tomized HMI solu­tions.

Do you have any ques­tions or would you like to find out more about our HMI solu­tions?

Our team will be happy to advise you and work with you to find the best solu­tion for your project. Use our con­tact form or call us directly — we look for­ward to hear­ing from you!

Project request
Technical ques­tion

Non-​binding contact request


    EP Electronic Print GmbH
    Am Weidegrund 8 & 10
    82194 Gröbenzell     Technische Anfragen:
    Telefon: +49 (0)8142 /420896–20
    E‑Mail: projekte@ep-electronicprint.de     Allgemeine Anfragen:
    Telefon: +49 (0)8142 /420896–0
    E‑Mail: info@ep-electronicprint.de