Touch Screen LCD Displays Capacitive | Factory

How to Solve Unresponsive Touch Caused by Surface Water Stains in Outdoor Applications
1. The cover glass is treated with a highly wear-resistant hard AF hydrophobic and oleophobic coating. Rainwater quickly converges into water beads and slides off the screen, making it difficult to form a continuous water film. This physically prevents touch signal disorder caused by large-area conductive water films.

2.Equipped with industrial-grade waterproof dedicated touch IC and water stain suppression algorithm, it can automatically identify and filter interference signals generated by continuous water stains and running water, only recognizing valid finger touch points to avoid touch drift and random false touches under water spraying or rainy conditions. The water false touch lock mode can be enabled to temporarily disable touch function in case of large-area water accumulation, with automatic touch recovery once the surface is dry.

3.The screen bezel adopts an inclined flow-guiding structural design. During water spraying or rainfall, water flows can be quickly drained along the bezel to prevent water accumulation at the edge of the cover glass from seeping into the interior of the screen.

4.The process of full lamination with OCA optical adhesive plus side UV sealing completely eliminates air gaps between the cover glass, LCD screen and touch layer. Without enclosed air cavities, internal condensation will not occur due to temperature differences between cold and hot environments, fundamentally resolving intermittent touch failures caused by condensation inside the interlayer.

5.The front of the whole module is compression-sealed with an EPDM weather-resistant sealing ring, and the FPC cable outlet is pot-sealed with water-resistant polyurethane adhesive, achieving an IP65 or higher dustproof and waterproof rating to block sprayed rainwater and humid air from entering the device cavity through gaps.

6.Transparent three-proof coating is fully sprayed on the touch FPC gold fingers, drive mainboard and ITO conductive circuits to provide protection against moisture, mildew and corrosion. Even if a small amount of water vapor intrudes, it will not cause circuit leakage or abnormal signals, reducing intermittent touch failures.

7.Wide-temperature industrial-grade components are adopted internally, with an operating temperature range of -30℃ to 70℃. They can withstand drastic temperature changes and prevent occasional malfunctions caused by abnormal electrical performance of components due to temperature fluctuations.

How to Solve the Problem of UV Aging Caused by Long-Term Sun Exposure for Touch Modules in Outdoor Applications
1.Outdoor UV-resistant and anti-yellowing OCA optical adhesive is selected. UV absorbers and antioxidant stabilizers are added into the adhesive to restrain oxidative yellowing under long-term sunlight exposure. Combined with the segmented gradient UV curing process, residual active groups in the adhesive are eliminated to delay aging and discoloration in the later service period.

2.The periphery of the screen adopts a UV resin edge-sealing process, which blocks ultraviolet rays, oxygen and moisture from eroding the OCA adhesive from the sides, cuts off edge aging channels, and prevents adhesive delamination caused by dampness.

3.The cover glass adopts ion evaporation multi-layer hard AR anti-reflection and AG anti-glare coatings, paired with long-term UV-resistant hard AF hydrophobic and oleophobic coatings to replace conventional soft coatings. The coatings are resistant to peeling, mottling and transmittance attenuation even under long-term sun exposure.

4.A UV barrier protective coating is added on the back side of the glass to filter most ultraviolet rays and reduce damage to the inner adhesive materials and polarizers caused by ultraviolet light penetrating the glass.

5.Industrial outdoor-grade UV-resistant wide-temperature polarizers are adopted, which are equipped with built-in UV barrier layers to filter most ultraviolet radiation. This prevents the polarizers from aging, fading and polarization performance degradation, as well as screen contrast reduction, color distortion and partial yellowing.

6.Brand-new weather-resistant virgin engineering plastics of PC/PC+ASA blended with UV stabilizers and antioxidants are used. The housing is treated with weather-resistant coating or anodizing, ensuring no fading, chalking, embrittlement or deformation under long-term sunlight exposure, thus preventing sealing compression failure.

7.The tapes used for FPC fixation and shielding are replaced with UV-resistant high-temperature black PI insulating tapes and outdoor-grade PET shielding adhesives, which are resistant to aging edge curling, chalking and cracking. The whole device adopts EPDM ethylene propylene diene rubber sealing strips and weather-resistant polyurethane sealant for sealing. Featuring excellent resistance to ultraviolet and ozone aging, they can sustain the IP protection rating for a long service life.

FAQ
Q1: How does your touch module prevent OCA yellowing caused by long-term outdoor sunlight exposure?
A1: We adopt outdoor UV-resistant anti-yellowing OCA optical adhesive with added UV absorbers and antioxidant stabilizers to inhibit oxidative yellowing. Combined with segmented gradient UV curing technology, residual active groups inside the adhesive are eliminated to slow down aging and discoloration. Meanwhile, UV resin edge sealing around the screen isolates ultraviolet rays, oxygen and moisture from eroding the OCA adhesive from the sides, effectively avoiding edge yellowing and delamination.

Q2: What coating solutions are used to avoid cover glass coating peeling and discoloration under long-term sun exposure?
A2: The cover glass is coated with ion-evaporated multi-layer hard AR anti-reflection and AG anti-glare films, matched with long-acting UV-resistant hard AF hydrophobic and oleophobic coating instead of ordinary soft coating. A UV barrier protective layer is also applied on the back of the glass to block most ultraviolet rays, so the coatings will not peel, mottle or suffer transmittance attenuation after long-term exposure.

Q3: How do you protect the LCD polarizer from UV aging and color distortion in outdoor scenarios?
A3: We use industrial outdoor UV-resistant wide-temperature polarizers equipped with built-in UV barrier layers to filter most ultraviolet radiation. This prevents polarizer fading, polarization performance attenuation, screen contrast reduction, color distortion and local yellowing caused by long-term ultraviolet irradiation.

Q4: What materials are adopted for the housing to avoid aging failure under long-term outdoor exposure?
A4: The housing is made of brand-new weather-resistant PC/PC+ASA virgin engineering plastics mixed with UV stabilizers and antioxidants, treated with weather-resistant coating or anodizing. It will not fade, chalk, embrittle or deform under prolonged sunlight, so as to guarantee stable compression performance of the sealing structure and prevent sealing failure.

Q5: How to guarantee the long-term stability of internal adhesive tapes and overall sealing performance against UV aging?
A5: FPC fixing and shielding tapes are upgraded to UV-resistant high-temperature black PI insulating tape and outdoor-grade PET shielding adhesive to prevent edge curling, chalking and cracking. The whole machine uses EPDM sealing strips and weather-resistant polyurethane sealant with outstanding UV and ozone aging resistance, which can maintain stable IP protection rating for long-term outdoor operation.

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