A look at transflective
LCD technology

Transflective displays are slowly but steadily gaining a higher market share. What are transflective displays, what properties do they have and how does the development continue? The article by display customizing specialist DMB Technics describes what is currently possible and gives an outlook on micro LED displays.
Transflective is an artificial word that describes the optical properties of displays. Displays in this technology have both a transmissive and a reflective light component. For simple, passive displays, such displays have been used for a long time.
In addition to the transflective properties, the display of colours is also desired. However, it is very difficult to achieve adequate brightness in combination with good colour values in reflective operating mode. Thanks to the widely introduced, innovative semiconductor technology – called LTPS (Low Temperature Polycrystalline Silicon) – the conductor path structures in the TFT have been optimised so that reflectance levels of up to 12 percent can be achieved with good colour values.
HMI – Display
In the above example, the display would have a luminance of 1100 cd/m² in reflective mode in the sun – and that without background lighting. The latest technologies for transflective displays offer an optimum balance between the reflective outdoor mode – e.g. under sunlight – and the indoor mode, in which the backlight supplies the display with light from the rear.

ECB technology
for transflective displays

One such advanced technology is ECB (Electrically Controlled Birefringence). The ECB technology makes transflective TFT displays possible, which provide optimal results. Transflective TFT displays enable customer-specific adjustment of reflection and transmission values, a large effective aperture of the individual pixel (aperture ratio), high transmission even at high resolutions, high resolutions up to 300 PPI and a low-power architecture. Further advantages are the low EMC emission – an advantage when using CTP (Capacitive Touch Panel) – large viewing angles 80/80/80/80, contrast values up to 800:1, small colour shifts versus viewing angle, suitability for optical bonding and low operating voltages. In this technology, DMB Technics offers, for example, a 1.3-inch ECB TFT with a resolution of 176 × 176 (RGB) pixels. From these explanations it can easily be concluded that the development of displays is subject to a constant pressure to innovate. The consumer market is pushing certain features very strongly. Users in other markets can also benefit from this, for example in the automation sector.
Transflective display with colour representation
Customised bar-type TFT display
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