15 Inch Touch Screen Display | Outdoor Application
To address poor visibility under strong outdoor sunlight, we select high-brightness LCD panels with a brightness of 1500 nits. Equipped with industrial-grade touch ICs, the product operates reliably within a temperature range of -20℃ to 70℃, delivering stable touch performance even in extreme environments and effectively cutting maintenance costs.
How to Solve Poor Visibility Issues of Touch Modules in Outdoor Applications 1.The air gap between the display screen and the touch cover glass is eliminated. The sensor, cover glass and liquid crystal screen are seamlessly bonded together using high-transmittance OCA optical adhesive. This fundamentally eliminates multiple specular reflections at the interfaces between air and glass, significantly improving screen contrast under strong sunlight and greatly reducing mirror glare.
2.Industrial-grade OCA optical adhesive with high light transmittance and low haze is adopted, featuring a light transmittance of no less than 92%, which prevents the screen from appearing gray and avoids color distortion.
3.After lamination, the modules undergo high-pressure defoaming as well as high and low temperature aging treatments to release internal stress, eliminating failures such as bubbling, delamination and yellowing during long-term outdoor use under alternating high and low temperatures.
4.A ring of UV sealing adhesive is applied along the edges of the fully laminated screen to block outdoor dust, rainwater and moisture from penetrating into the lamination interface. It prevents fogging caused by water ingress at the edges, which would otherwise lead to reflective blurriness, making the product suitable for open-air applications including construction machinery, rail transit and outdoor CNC machine tools.
5.The outer surface of the cover glass adopts AG anti-glare etching treatment, which converts specular reflection into soft diffuse reflection, avoids dazzling bright spots caused by direct sunlight, and ensures clear display content under backlight and intense midday sunlight.
6.AG+AR double-layer coating technology: Multiple anti-reflection optical films are coated on AG glass to reduce the visible light reflectance of the glass surface to less than 2%. It can not only prevent glare but also suppress specular reflection, delivering optimal visibility under scorching midday sun, backlight and vehicle window reflective environments. Meanwhile, it features hydrophobic, oleophobic and fingerprint-resistant properties.
How to Improve the Environmental Adaptability of Touch Modules for Outdoor Applications 1.Abandoning ordinary short-effect AF spray coating, we adopt a vacuum sputtering multi-layer hydrophobic and oleophobic coating. The surface water contact angle is ≥110° and the oil contact angle is ≥70°. Rainwater forms water beads that roll off the screen without spreading, while oil stains and fingerprints can be easily wiped away. This greatly reduces touch drift, random touch points and false touches caused by conductive water residue.
2.The AF coating we selected can withstand at least 10,000 times of steel wool abrasion. Combined with high-stress chemically tempered cover glass, the AF layer will not be worn off quickly when cleaning dust with ordinary rags, dust-free cloths or dry brushes. The screen resists dirt accumulation over long-term use and avoids partial abnormal touch issues.
3.The cover glass surface is optimized for anti-fouling and dust-proof performance, and the edges are processed with large rounded chamfers to eliminate dust-trapping dead corners, preventing sand, dust, mud and sewage from accumulating in the gaps between the screen bezel and the glass joint.
4.Equipped with an industrial-grade mutual-capacitance touch chip featuring a high signal-to-noise ratio to enhance anti-interference capability, the module supports wet-hand and waterproof touch modes. By increasing the dynamic baseline refresh rate, it rapidly offsets capacitive baseline drift caused by conductive water stains on the glass surface and suppresses multi-point jumping and ghost touch issues.
5.The TX transmitting driving voltage is optimized to improve sensing sensitivity while adding noise filtering channels. Weak leakage interference caused by accumulated sand and dust is shielded in real time to prevent false triggering and unresponsive clicks.
6.The sensor circuit adopts a shielding layer design. Grounded shielding traces are added at the bottom layer of ITO electrodes to isolate interference from electrostatic leakage caused by surface water stains and dust on the sensing channels.
7.The large-area touch point shielding algorithm is enabled. Flowing rainwater and large water stains are identified as continuous conductive touch regions covering an extensive area. The algorithm automatically classifies such conditions as environmental interference and filters them out, only recognizing valid small-scale touch areas from fingers to eliminate random jumping touch points across the entire screen.
8.Adopt touch point anti-shake and area threshold filtering to filter out scattered weak clutter triggers caused by tiny sand and dust particles, while maintaining normal operability for gloved and wet-finger operations.
9.OCA full lamination technology is adopted to replace frame bonding, eliminating the air layer inside the screen. It prevents sand, dust and water vapor from penetrating the gap between the display and touch layers, thus avoiding internal fogging and dust accumulation which would otherwise lead to blurry screens, electrode leakage and touch malfunction.
FAQ 1.Q: How does your touch screen avoid false touches caused by outdoor sand and dust? A: We adopt touch point anti-shake and area threshold filtering algorithms to filter scattered weak clutter signals triggered by tiny dust particles. Meanwhile, the touch function for gloved hands and wet fingers is well retained to ensure normal operation in harsh outdoor scenarios.
2.Q: Why is OCA full lamination much better than traditional frame bonding for outdoor use? A: Full lamination eliminates the internal air gap between the touch layer and the display. It prevents sand, dust and water vapor from seeping into the interior, effectively avoiding screen fogging, dust accumulation, internal electrode leakage and touch failure.
3.Q: What hardware designs are used to improve the anti-interference ability of the touch sensor? A: A shielding layer is designed for sensor circuits with grounded shielding traces laid under ITO electrodes to block interference from static electricity and leakage caused by water stains and dust. We also optimize TX driving voltage and add multiple noise filtering channels to shield weak leakage interference in real time.
4.Q: How does the product realize stable touch control when the screen is covered with rainwater? A: Equipped with an industrial high-SNR mutual-capacitance touch chip, it supports wet-hand and waterproof touch modes. Combined with a large-area touch shielding algorithm, continuous large-area conductive water stains from rain will be identified as environmental interference and filtered out to prevent ghost touches and random jumping points.
5.Q: What surface and structural designs help reduce dirt accumulation outdoors? A: The cover glass features a wear-resistant AF hydrophobic and oleophobic coating, with large rounded edge chamfers to eliminate dust-collecting dead corners. UV edge sealing further blocks dust and moisture intrusion, keeping the screen clean and avoiding local touch abnormalities from long-term dirt buildup.
