I haven't been following up the progress in this.
First of all, I don't know transparent displays are based which of the existing technologies. Is it LCD? OLED, E-ink? or something else?
Let's assume transparent displays are based on LCDs, then we have to get rid of polarizers, color filters, back-lights. Although I know there is still another type of polarizers that might be critical for this type of application. To get rid of color filters, multiplexing in the time domain seems to me the only choice.
It can be LCD and OLED technology to make Transparent Display.People also use semi transparent film and projectors as a transparent display.
In LCD, Back light unit is key part.
In OLED the design of the color pixels beside each other is key point.
The fluorescent lights in an LCD(liquid crystal display) are always behind the screen. On an LED TV, the light emitting diodes(LED) can be placed either behind the screen or around its edges. The difference in lights and in lighting placement has generally meant that LED TVs can be thinner than LCDs, although this is starting to change.
Thank you, particularly Daniela, for pointing out the connection between transparent displays and Zeiss smart glasses. I'm still digesting all this. Semi-transparent films can be many types, not just amplitude- (or intensity-) divided. Polarization, spectrum, or even phase and diffraction orders might be exploited. Sophisticated wave-guide type of lights can be placed at the edges instead of blocking the view. So many possibilities. Janus particles, is that also a possibility? So my understanding is that Zeiss smart glasses are actually transparent near eye displays, and still a lot of work to be done to solving the problems of sever eye strains and people's having a hard time focusing on the images on the glasses.
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