3.5 inch 4 wire resistive touch screen

About 3.5 inch 4 wire resistive touch screen

3.5 inch4 wire resistive touch panel, accept customization

Intercom systems: Video door phone, video peephole viewer, phone etc.

Safety and Security: Monitors, touch PCs

Consumer Electrics: Advertising players, TVs, ATMs etc.

Telecommunication Devices: Telephone, Interphone, watch, radio, etc.

Home Appliances: Washing Machine, Refrigerator, Home Integrator,digital photo frame

Industrial Control:HomoeostasisNumerically-controlled machine tool

Instrument and Apparatus: Tester, Medical instruments

Vehicle-mounted Digital: MP3, MP4 and vehicle-mounted air conditioner

Mining: Mine's lamp charger, gas tester

Marine: Salinity tester

Parameters:

Size available	1.4,1.8,2.0,2.4,2.8,3,3.2,3.5,3.8,4.3,4.5,4.8,5,5.6,6.5,7,7.5,8,8.4,10,10.1, 10.4,12.1,14,15,15.4,15.6,17,18.5,19,21.5,23.6 INCH
Performance
Resoslution	4096*4096
Linearity Error	<2.5%
Response Speed	<10ms
Mechanical
Input Method	Finger or stylus
Life Span	More than 10 million touches
Pressure	10-100g
Surface Hardness	3H
Optical
Light Transmission	>78%
Structure
2 layers	Film+ITO glass
3 layers	PET+Film+ITO glass(cusomize)
4 layers	PET+Film+ITO glass+PC/PMMA/GLASS (customize)
Environmental
Operating Temperature	-10 50C
Storage Temperature	-20 60C
Operating Humidity	0%90%
Storage Humidity	0% to 95%
Electrical
Voltage	Typical 3-7V
Current	5mA25mA
Interface	Full Duplex USB 2.0 (Full Speed) Plug and play compatible
	Serial RS-232. Baud Rate: 9600, 8 Data Bits, 1 Stop Bit, No Parity
Isolation Resistance	>20M
Resistance	300< X Axis <900, 200< Y Axis <800 (Varies with different size)
Agency Approvals	CE, Rohs
Operation System	Linux/ Dos / Windows /Mac/QNX
Standard controller	EETI 5 wire/4 wire USB/RS232 controller kits(include board and calbes)
Special requirements	High-Transmittance Glass,light touch, Strengthened Glass,optional

Available4 wire resistive touch screen models:( if haven't found suitable one, please contact with us.)

Sturcture

ITO FILM

Classification by Surface Treatment

a. Glossy Anti-Scratch Surface Low haze, providing better visual clarity. More challenging manufacturing process. Lower durability against scratches.

b. Glossy Anti-Newton Ring Surface Includes an anti-Newton ring layer. Reduces manufacturing difficulty.

c. Matte Anti-Glare Surface Features an anti-glare layer. Optimized for outdoor use with improved visibility.

Classification by Sheet Resistance

a. Low Resistance Primarily used indigital resistive touchscreens. Lower loop resistance, resulting inhigher sensitivity.

b. High Resistance Mainly used inanalog resistive touchscreens. Lighter etching traces, offeringbetter visual appearance.

Classification by ITO Film Substrate

a. Single-Layer Film Uses asingle-layer PET substrate,lower cost.

b. Double-Layer Film Uses adual-layer composite PET substrate,higher cost. Softer and more durable, used inhigh-end products.

ITO GLASS

Classification by Strength

a. Chemically Strengthened Glass Treated with chemical tempering to increase surface compressive stress. Enhances overall strength but at a higher cost.

b. Standard Glass Conventional glass without special strengthening treatment

Classification by Transmittance

a. High-Transmittance Glass (AR-Coated) Features anti-reflective (AR) coating, improving light transmission by 3% over standard glass.

b. Standard Glass No additional optical enhancement.

Classification by Thickness

Standard Thicknesses:0.7mm / 1.1mm / 1.8mm

Special Thicknesses:0.55mm / 2.8mm

Classification by Resistance

a. High Resistance (400) Used inanalog resistive touchscreens.

b. Low Resistance Primarily fordigital resistive touchscreens.

FPC

a. Core Materials of FPC: Base Material, Copper Foil, Stiffener, Coverlay

b. Common FPC Structures for Touchscreens

Touchscreens typically use either: Single-layer FPC/Double-layer FPC

c. FPC Material Specifications Base Material

Adhesive-based: Contains adhesive layer between copper and PI (polyimide).

Adhesive-less: Eliminates adhesive layer, consisting only of copper foil and PI (Thinner profile, Superior dimensional stability, Enhanced heat resistance, flex endurance, and chemical resistance, Now widely adopted in industry)

Copper Foil

Rolled Copper:Better flex endurance;Not suitable for ultra-thin boards or fine circuitry;Commonly used in resistive touch screens

Electrodeposited Copper: Preferred for capacitive touch screens

Stiffener Materials:

Type	Characteristics	Application
PI	Lowcost,pronetodeformation	Resistivetouchscreens
FR4	Balancedcost/performance	Mid-rangeapplications
Steel	Highperformance,expensive	Capacitivetouchscreens

PET COVER LENS

Thickness

Thickness	Characteristics	Application
0.125mm	Lightertouchforce,poorerflatness	Nicheapplicationsrequiringsensitivetouch
0.188mm	Balancedtouchforceandflatness	StandardforRTP(ResistiveTouchPanels)
0.25mm	Highertouchforce,excellentflatness	Applicationsrequiringdurability

Surface treatment

Type	Characteristics	KeyParameters	Usage
GlossyAnti-Scratch	Scratch-resistantcoating	Hightransmittance Lowhaze	Mostcommon(indoordevices)
MatteAnti-Glare(AG)	Diffusesurfacetreatment	Reducedreflectivity Higherhaze	Outdoor/sunlight-readableproducts
GlossyAnti-NewtonRing	Multi-layeropticalconstruction	EliminatesNewtonRing	Limiteduse(3-layer"framedpanels)

Carrier Plate

Material

Material	Characteristics
PC(Polycarbonate)	Impact-resistant,butlowersurfacehardness(max2H),cost-effective
PMMA(Acrylic)	Impact-resistant,highersurfacehardness(upto3H),pronetowarping/shrinkage
PC/PMMAComposite	CombinesbenefitsofPC&PMMA,buthighercost
Glass	Highsurfacehardness(6H),minimalwarping/shrinkage,moderatecost,butlessimpact-resistantthanplastics

Thickness

Glass:0.55mm / 0.7mm / 1.1mm / 1.8mm

PC/PMMA/Composite:0.5mm / 0.65mm / 0.8mm / 1.0mm / 1.5mm

How to assemble the resistive touch screen to the housing?

To prevent false triggers, the housing must not directly contact the active touch area. Maintain an air gap of 0.20mm0.50mm between the housing and touchscreen surface. Recommendations for Customers: Step Design Add a peripheral step on the housing(Foam Tape) Width:Should not exceed TP silver trace boundaries Height:0.20.5mm

When installing a resistive touch screen, it is recommended not to position the FPC downward. In outdoor environments with significant temperature differences, water vapor may condense on the touch screen surface. Additionally, external water, under the influence of gravity, may flow along the touch screen surface, seep through the casing, and reach the FPC bonding area. This can corrode the FPC bonding position and affect product reliability. If the touch screen is installed in this orientation, the waterproof performance of the entire device should be designed to a higher level.

Do resistive touchscreens require calibration?

A resistive touchscreen detects touch positions by measuring voltage signals generated at the contact point. When a finger or stylus presses the screen, the conductive layers (typically made of ITO) at the touched location undergo a change in resistance, producing corresponding voltage signals. These signals are then converted into X and Y coordinates, enabling precise touch recognition and positioning. From the operational principle described above, the key takeaway is that resistive touchscreens rely on voltage signal acquisition for coordinate recognition. The consistency of these voltage signals is fundamentally determined by the uniformity of the conductive layer (ITO layer). Industry-Specific Manufacturing Reality: ITO Layer Production: The industry-standard magnetron sputtering deposition process inherently creates thickness variations This results in sheet resistance (a conductivity equivalent) tolerances Typical industry specification: 400100 (representing 25% variance) Performance Implications: Inter-panel voltage distribution variations are unavoidable due to: Initial sheet resistance tolerances Thickness non-uniformity (typically 5% across panel) Long-Term Performance Factors: ITO layer degradation characteristics: Annual sheet resistance drift: 3-8% (accelerated by environmental factors) Operational lifespan impact: 50,000+ touch cycles (industry benchmark) Compensation Solution: Dynamic calibration protocols are implemented to: Compensate for initial manufacturing variances Counteract progressive ITO aging effects Maintain 1% coordinate accuracy throughout product lifecycle In summary, to ensure touch accuracy, calibration is essential for resistive touchscreens.

Package

Office

Factory

Precision Touch Control

Utilizing four-wire resistive technology, this touch screen provides fast and accurate touch detection. Its pressure-sensitive surface with a touch activation force of 30-80g ensures consistent performance, while the analog interface allows integration with ELO, ADC, and common microcontrollers used in display applications.


Durable and Versatile

Engineered to withstand up to 1 million touches per point, this panel offers robust durability for high-usage environments. The straight edge, bezel-free design simplifies installation over compatible TFT LCD displays using adhesive or mounting brackets, making it suitable for varied industries.


Superior Transparency and Safety

With light transmission around 80% and materials like glass and PET film, visual clarity is maintained while supporting accurate touch input. ESD protection (air > 15kV, contact > 8kV) enhances safety in sensitive electronic setups, and RoHS compliance supports environmental responsibility.