Last week we reported that Ennostar Incorporation (formed by a merger of Taiwan's Epistar and Lextar in 2020) demonstrated a 10.6" transparent microLED display at Touch Taiwan 2021. We now have more information on Lextar's new display prototype.

Lextar 10.6'' transparent microLED with spec (Touch Taiwan 2021)

This square display features a 640x640 resolution (85 PPI) and uses LED chips that are <50 um in size. This is a TFT-based display (LTPS? we're not sure) that achieves a transparency of 61%, a brightness of 3,000 nits (peak value) and a 120Hz refresh rate.

Lextar also demonstrated a smaller 5.1-inch transparent display that was developed in collaboration with X-Display (this could be the same display shown in 2019). This display is based on a micro-IC structure to achieve a transparency of over 70%.

Lextar's microLED display prototypes (Touch Taiwan 2021)



During the event, Lextar also announces its new micro-chip-in-package products. Lextar says that technology makes it possible to reduce micro-R/G/B LED chips to a pixel-sized package that is embedded onto PCB substrates. This enables very high contrast and Lextar says that this technology not only makes screens appear more three-dimensional, but it also enables excellent color uniformity over a wide range of viewing angles.

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Display resolution

Could  you explain what exactly is going on with these large microled displays?

I thought a microled display was standard res, eg 640 pixels wide, but around 5 - 10mm in size.

So a large "microled" display, say 200mm wide, composed of those devices, would be over 12,000 pixels across.  Clearly, from the story that's  not the case.

Could you clarify please?

Thank-you, 

Graham,I'm not sure what you

Graham,

I'm not sure what you mean - but there are many types of displays. Some are "tiled" and made from modules - each company with its own specifications. Some are produced on TFTs, like the one from Lextar, and are so with its own resolution/spec.

Display resolution

Ok, I'll try again.

The PPI is about the same as for an HD tv.

Isn't the term "microled" usually associated with a much higher resolution than that??

(Eg in a micro-display about 1cm wide, 640 pixels across, or about 1600 PPI.?)

Thanks.

Ah, I think I understand the

Ah, I think I understand the confusion. This is a common one.

A microdisplay is indeed a display that is small (<1inch usually) and with high performance and resolution. There are many technologies that can be used to build one: LCoS, OLED, MicroLED, DLD...

MicroLEDs are displays made from small (micro) LED chips. These can be used to make displays ranging from microdisplays to ultra-large area TVs (like the Sony Canvas Display or Samsung's Wall).

Close terms, but not the same.

Ron

Ok, gottit! Thanks.

Ok, gottit!

Thanks.