3.2 inch 4 wire resistive touch screen

Product Description

3.2 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:

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:

PET COVER LENS

Thickness

Surface treatment

Carrier Plate

Material

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 tolerancesThickness 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 variancesCounteract 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