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Rugged TFT-LCD Modules viewing excellence semis.info@meg.mee.com · www.mitsubishichips.eu TFTs Driving TFT displays to the perfection By Dieter Kiermaier On one hand, high definition TFT displays have become a master component of industrial applications, on the other hand, there is still a lack of interface standardization for the control of these displays. Interface incompatibilities were already an issue with the old CCFL-backlighted TFTs, but today’s LED backlight technology requires an even stricter management of signal timing (the power-on sequences) to avoid damage to the display or to the integrated LED driver. Fig. 1: Customer specific converter card in use in an avionic infotainment monitor. Source: Distec With increasing resolutions soon moving to 2k and 4k, the design complexity in hardware layout including cables and layout is rising. Users‘ expectations for high quality video playback performance call for scaling graphic processors featuring complex functions such as Motion Adaptive De-Interlacing, Motion Adaptive Noise Reduction, LCD Overdrive, adaptive comb filters for analogue video signals and many more. Customization case-study for civil aviation infotainment Designed with industrial components to meet all these market requirements, Distec’s Prisma-IIIA is a user-configurable TFT controller board. The card works in the 0 to +70°C temperature range, which can be optionally increased to the -20°C to 70°C range. This makes the product versatile enough for full customization. For particular needs, an alternative to standard adaptations is to design a full custom product, providing a perfect match with the application requirements. One example of an adapted design is a Prisma-custom – see figure 1 - which forms the basic platform for an infotainment monitor in VIP, government and business jets. In this particular case, the limited space and the long-term availability were crucial design constraints. Potential software extensions operate hour counters, screen-savers, and parameters such as brightness are controlled with an additional button or GPIO-Pins. Within this specific 15.4” TFT project, a LED controller was also designed to replace the standard integrated one, which didn’t meet the avionic EMI emission needs. All industrial requested inputs are available on the converter board. The DVI input provides 1080p with a colour depth of 12-bit and is HDMI/HDCP compatible. Dieter Kiermaier is Head of Sales and Marketing Components at Distec – www.distec.de - He can be reached at Kiermaier@distec.de www.electronics-eetimes.com Electronic Engineering Times Europe October 2013 23


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