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Display Technology


applications require the truest possible colours and Quantum Dot technology will address this in the future. It’s also possible to get combined displays with a very low power character display overlaid on a TFT so sleep and standby power usage requirements can be achieved whilst in use. Next decide on your interface. TFTs


routinely come with RGB16/18/24 or LVDS interfaces and many have MIPI (DSI) built in, but more and more HDMI is available making hooking up an SBC a doddle. Then pick your touchscreen. I2C interfaces are popular for micro based designs and USB for SBCs but you might also want multi point touch, or even input from a gloved hand. Finally, select your cover lens. You


may want thick glass for high impact resistance or coatings for fingerprint prevention or anti-glare. The cover is normally designed to be slightly bigger than the display so it can be fitted onto the front of your product, perhaps in a rebate or right up to the edge to provide that sleek, beautiful finish you’re after. The cover lens is often screen printed to cover the peripheral of the active area and colour matched to the off screen to give an ‘all black’ effect like a smartphone. At this point you can add branding to the screen,


www.cieonline.co.uk


adding a logo or model details making it truly bespoke to you. Using a fully assembled HMI unit this


way not only provides the finish and ergonomics the modern user expects but it can also be economical. The HMI vendor warranties the whole part, so if something goes wrong, you’re not throwing away screens because the touch doesn’t work properly and furthermore you don’t need a clean room or expensive jigs to do complex assembly work that adds nothing to your product’s competence or value. In some cases, additional electronics


can be added, protocol or interface bridges for example. These are often bespoke to the specific TFT screen and it makes sense to leverage the screen designer’s knowledge to optimise this part. The often-criticised millennial is here


to stay and they expect levels of ergonomics, connectivity and finish that match the devices they use every day. You can design for them without breaking the bank and without throwing away years of hard-won knowledge and experience in your product and application. They will quickly take up your product and find out how good it really is.


gtk.co.uk Components in Electronics May 2019 13


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