Parker Chomerics EMI Shielded Touchscreens combine today's state of the art touchscreen technologies with our industry leading EMI shielding expertise. Touchscreens are available in a wide range of military and industrial products. They are being specified in more applications such as military, homeland security, first response and medical where EMI shielding is required. A touchscreen fully integrated with an EMI shield simplifies the compliance with tough EMI requirements.
Parker leverages its materials science and lamination skills to integrate EMI shielding materials with the most specified types of touchscreens, including resistive and projected capacitive. Various shielding materials are available, such as: ITO conductive coatings, blackened plated stainless steel mesh and blackened copper mesh. These highly transparent conductive films and specially designed fine wire meshes can be selected for the best optical and EMI shielding performance. EMI shielding is fully integrated into the touchscreen assembly with no air gaps or voids using optical grade PSA.
Parker stocks EMI shielded resistive and projected capacitive touchscreens and can integrate with customer supplied touchscreens or procure a specified touchscreen for you. We also assist with the design of an appropriate EMI shield based on the application requirements. The EMI shield is optically bonded to the rear of the touchscreen and the required buss bar termination is applied. CHO-FOIL® Copper tape can be used to wrap the buss bar to the front side of the touchscreen to provide a ground plane. In addition, our shielded touchscreens can be provided with a wide variety of conductive gaskets for assembly into bezels and frames.
Product Features:
• EMI shield thickness as thin as 0.007”
(0.177 mm)
• Custom sizes to match touchscreen size
• Shielding materials laminated with
polycarbonate
• 4 and 8 ohms/sq conductive films for EMI
shielding
• Wire mesh: 50, 80, 100 OPI (openings per
inch) plated stainless steel mesh
• Rear surface of EMI available with
anti-reflective surface to increase light
transmission
• Optical grade full coverage PSA for gap free
bond
• Standalone EMI shield with optical grade
PSA available for customer assembly to
touchscreen
• EMI shielded resistive touchscreens
• EMI shielded projected capacitive
touchscreens
Typical Applications:
• Military electronics
• Hand-held mobile devices
• Rugged LCDs
• Tempest environments
• Devices used in critical patient care
environments
• Shielded cabinets and racks
• Digital signage and kiosks
• Instrument panels
Standard Stock EMI Shielded Touchscreens:
Parker Chomerics has standard stock size touchscreens that are used as easy drop-in designs for EMI shielded touchscreen applications. Standard stock parts as well as customized sizes are available. Resistive (4-, 5-, and 8- wire) and projected capacitive touchscreens are offered as stock items. Customized projected capacitive cover glass is available in plastic or glass with custom graphics and sizes. Typical thickness is 1.1 mm with other thicknesses available. Connectors are either AMPC or ZIF connectors.
Controller boards are provided as standalone controllers, chip on flex or controller chip to be integrated into custom board. These can be furnished with all necessary cables to connect to RS-232, USB or I2C interfaces. Customizable firmware is offered for projected capacitive touchscreens. Operating systems supported include Windows® CE 5.0-7.0, Windows XP, Windows Vista/7, Windows 8, Windows XP Embedded, Unbuntu® 10-12, Fedora 16-17, OpenSUSE® 12.1, RHEL 6.0-6.2 and Linux®.
Parker can also integrate consigned touchscreens with shielding or procure specified touchscreens with specific vendors for supply chain services.
Material Properties:
EMI Shielding Properties
EMI shielding options consist of blackened mesh and conductive coatings. Selection is based on the follow criteria: For high EMI shielding requirements 100 or 80 OPI mesh is the desirable choice for superior shielding. If higher light transmission is desired, conductive coatings are a suitable solution. Both mesh and conductive coating options provide excellent clarity and maintain sharp image fidelity.
Typical sheet resistances are 4 and 8 ohms/sq. 4 ohms/sq has higher EMI shielding than 8 ohms/sq (see shielding effectiveness curve, page 2, WIN SHIELD pdf in Product Support). Other sheet resistances (ohms/sq) are available upon request.
