Technology of transflective displays

Image 1: Schematic structure of a transflective display
The market for transflective displays has grown recently, especially in the e-mobility sector. The potential applications in this field require high readability in different light conditions, such as direct sunlight.
Special Industrial PC / HMI
Such displays must withstand very harsh environments. As a result, the display brightness must be significantly improved, or the effect of high ambient brightness must be reduced. Otherwise, the displayed images would appear washed out and especially the color saturation would be completely lost. For classic displays in transmissive mode (e. g., TFT) or for self-illuminating ones (e. g., AMOLED), surface brightness’s of at least 2,000 nits (cd/m2) are required for good readability.
However, displays with such high brightness have significant disadvantages such as high-power consumption, burn-in effects, limited lifetime, and large power dissipation leading to high temperatures. Transflective display systems have been available on the market for some time. Older technologies achieve a reflectance of about 1 to 2 percent of ambient light. However, these displays are no longer up to date in modern applications.

High reflectance
for good display

The latest display technologies achieve a reflectance of up to 16 percent. This ensures high colour saturation and contrast even under direct sunlight (Image 1). With ECB (Electrically Controlled Birefringence) technology in combination with TN (Twisted Nematic) or IPS (In Plane Switching) technology, excellent contrast and colour values can be achieved under a wide range of conditions.
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