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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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Anti-reflection film

TFT modules with gasket bonding have an air gap between touch sensor and TFT. This gap leads to reflections in the TFT and is also the reason why TFTs look greyish, not black, in power off state.

The traditional solution to this problem is full-lamination, however this option is costly and not suitable for all types of cell and coverlens combinations.

An anti-reflection - moth eye - film can be a cost efficient alternative eliminating interfering reflections.

In off state, the module looks more blackish, which gives the application a fine look.

Most TFT-modules can be equipped with moth eye film, contact us for inquiries!

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Frontglass thickness options

Frontglass thickness options

LCDs can be equipped with high-quality frontglasses that can be customized in form and print. 

All our frontglasses are chemically hardened and several standard thicknesses are available.

 

Typical thicknesses are

0.7 mm

1.1 mm

2 mm

2.8 mm

 

Further options are available on request. 

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Round 1.22" TFT

With a 1.22" TFT we offer the perfect display for wearables such as smart watches or fitness tracker.

Details:

Resolution of 204 x 240

Outline dimension 33.76 x 33.40 x 1.24

Active area 33.36(H)x 32.70(V) 

Viewing angle 80/80/80/80

Brightness 500 cd/m²

 

Please contact us for a detailed datasheet: This email address is being protected from spambots. You need JavaScript enabled to view it.

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O-film - wide viewing angle solution

A well-known problem of TN TFTs is the reduced viewing angle for one direction. For this direction the picture will be inverted. 

While a typical solution is the usage of expensive MVA or IPS cells instead of TN cells, which provide better viewing angles for all directions, there is also a more cost-efficient technology.

A special polarizer - o-film - can be used to increase the viewing angle.

The picture shows one module with o-film (left), the other without. While the left one shows normal colors, the right one is difficult to read.

 no greyscale inversion with o-film

However, also the disadvantages should be mentioned. The brightness and contrast will be decreased by o-film and in fact o-film is more expensive than normal polarizer.

 reduced contrast with o-film

As a conclusion it can be said that o-film can be a good solution to enhance exhisting modules or provide low-budget wide viewing angle solutions.

O-film is suitable for many TN cells. Contact us for details.

 

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Contact

LCD Mikroelektronik GmbH
Otto-Lilienthal-Str. 13
76275 Ettlingen

Germany

Telefon: +49(0)7243-76888-0
Telefax: +49(0)7243-76888-29

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Exhibitions

Visit us at our stand:

Electronica Munich 2022, Stand B5.218