Sunlight readable displays

Normal displays, especially TFTs, are difficult to read in direct sunlight. If you want to make them sunlight readable, you need to consider some points in the design of your TFT module.

1. The surface brightness must be at least 500 cd/m2, in fact it is better to provide e.g. 800 cd/m2.

You may notice that you will increase the brightness of your smartphone in direct sunlight. If you decrease the brightness, the TFT seems to be black. So an essential point in order to design sunlight readable applications is to increase the surface brightness with a powerful backlight.

2. Use an anti-glare surface or anti-reflection coating. 

With a special anti-glare lens or anti-reflection coating you can reduce reflections on the surface of the module, which make the TFT difficult to read in direct sunlight.

3. Use optical bonding of front-glass and touch to display

Additional boundary layers in the module, between frontglass and touch as well as touch to TFT, cause additional reflections. Eliminating those boundaries by bonding the parts with optical clear adhesive or optical clear resin, will increase sunlight readability. 

Please contact us for further questions on sunlight readable modules, we are happy to help!

 

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Plastic front lens

Plastic front lens

A robust and light alternative to a front glass can be a PMMA coverlens.

Such coverlenses are available in different standard thicknesses and can be printed according to the customer requirements.

Hidden printing can be applied, as can be seen int he following picture. The buttons are not visible in normal mode, only if lighted up.

The edge can be cut to fit the customer housing conditions:

While breakage safety is better for PMMA than for glass, the drawback is the surface hardness. Screatches are more likely than for normal glass. 

 

 

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Kontakt

LCD-Mikroelektronik Dr. Hampel + Co. GmbH
Griesbachstr. 7
D-76185 Karlsruhe

Germany

Telefon: +49(0)721-98478-0
Telefax: +49(0)721-98478-29

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