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Once everything was plugged in, the person in charge of development launched the command orders from the main board through a CAN bus connection to the SpiderGraph HMI which converted the orders into images thanks to the integrated graphic engine. This engine is able to save up to 400 images composing the HMI as well as around 20 font characters. The graphic aspect of the HMI project was carried out by one of Clairitec’s internal designers. An ergonomics study of the equipment functions enabled to collectively achieve with the customer the accurate screen technical requirements (images, buttons and fonts of the HMI). The visual style required by the client called for important design adjustments in order to be compatible with the displays pictured with Clairitec HMI board (32 Mo memory which enables the saving of bitmap format pictures). Dividing as close as the nearest pixel all of the HMI elements (background, images, fonts, widgets) was carried out in 5 days. The whole project was then loaded into the GraphConverter software. This mandatory step enables to configure the HMI DISPLAYS & interfaces board and to precisely place the graphic elements according to the final needs of the customer. For instance, the start button of the device must be exactly placed 50 pixels away from the top right corner of the display so as to enhance working ergonomics. Besides all the command buttons were placed on the upper same axis to ensure an optimal reading while using the head-up display mode. By overcoming all these constraints, Clairitec had been able to develop a fully customized HMI down to the last details while guaranteeing ergonomics and optimal use thanks to a display with an incorporated resistive touch capacity. The last challenge was to offer a set EMC certified for industrial application. The high-brightness 7’’ display combined with the 6mm thick cover glass with integrated capacitive touch panel have been integrated into a mirror-polished stainless steel case equipped four fixing points. These have enabled the easy and quick integration into the front of the charging station. This protection guarantees limited radiations from the board and the display according to the certifications NF-EN55022 and/or NF-EN61000-4-2 and/or NF-EN61000-4-3. This equation between a customized HMI, a quick development and the EMC compatibility often occurs in many industrial projects. The strength of Clairitec solution stands in its ability to accurately resolve the equation thanks to its HMI products (with a durability of ten years) by working in close collaboration with the customer while guaranteeing a unique graphic quality. eDP: the next rung on display control’s evolutionary ladder By Matthias Keller When it comes to controlling TFT LCD modules directly, there have been two widely used technologies. For smaller displays sized up to about 10.4 inches, frequently the TTL / CMOS interface was used, and for larger models sized up to e.g. 82 inches with full HD resolution, LVDS (Low Voltage Differential Signaling) was the main choice. While the CMOS interface reaches its limits regarding data rates relatively quickly, with dual-channel LVDS resolutions up to 2048×1536 (QXGA) at 60 Hz are possible. Even 10-bit color depth per color (RGB) are not a problem. Theoretically, up to 10m cable length should be possible. In practice, however, at full HD resolutions and 60Hz, the potential cable length is 2m at most, depending on the line quality and the application. Sometimes even a cable length of more than 50cm causes EMC problems. Matthias Keller is COO Components at Distec GmbH - www.distec.de Distec‘s PrismaECO-eDP-controller board and LVDS2eDP interface board enable comfortable control of TFT displays with eDP interface 34 Electronic Engineering Times Europe June 2015 www.electronics-eetimes.com


EETE JUN 2015
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