Historic Discovery

As a long-established design house for display applications, LCD-Mikroelektronik can draw on decades of experience. Our founder experimented with the first liquid crystals already in the seventies of the last century. Here are some finds from a long time ago:

1. One of the first segment displays of LCD Mikroelektronik, which is probably more than 25 years old and has a green-yellow illumination. The display does not yet have its own display driver.

2. On this display the chip was turned by 180° and installed upside-down and has its own gap in the printed circuit board to reduce the overall height. For correct positioning, the display is fixed by a lateral spring. The light guide sends the light from behind over both sides through a prism effect onto the display.

 

3. Self-built display with silver wires and space for a total of 9 ICs on the two glasses.

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Low power passive matrix display

LCD-Mikroelektronik provides passive matrix displays with power usage of under 150 uA for energy critical applications!

Of course the power usage depends also on the displayed content. With six different contents  a power consumption range from 125 to 296 uA with a setting of a reference voltage of 8,35V, a booster of 3xVDD2 and a duty cycle of 1/128 could be measured.

 

The shown display is a low power monochrome FSTN positive matrix display with an SPI interface, FPC connector and a resolution of 128 x 128 dots. It has an active area of 55 x 55 mm and an operating temperature of -20  to +70°C, the drive method is 1/128 duty with a bias of 1/12.

The used power saving controller IST7920 comes from “Integrated Solutions Technology”. It supports a SPI, I²C as well as 6800 and 8080 interface. By  reducing the reference voltage, the booster and the duty cycle even the very low data between 55- to 94uA on the six different contents can be reached:

reference voltage

6,6 V

 

6,6 V

 

5,9 V

 

5,0 V

 

4,45 V

 

booster

 

3x VDD2

 

3x VDD2

 

2x VDD2

 

2x VDD2

 

2x VDD2

 

duty cycle

 

1/96

 

1/64

 

1/48

 

2x VDD2

 

1/24

 

power consumption

113 - 250 uA

 

103 - 209 uA

 

62 - 118 uA

 

57 - 97 uA

 

55 - 94 uA

 

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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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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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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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