Hybrid display combines transmissive, reflective technologies

Hybrid display combines transmissive, reflective technologies

Technology News |
The Semiconductor Energy Laboratory (SEL) Co Ltd in Japan has developed a smartphone-sized 4.38-in. hybrid display that combines two display technologies into one: OLED for its very high contrast and color quality indoors, and a reflective LCD for its high readability in bright outdoors.
By Rich Pell

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At the last SID conference, the research lab showcased its TR-Hybrid display, as it calls it (“T” for transmissive OLED and “R” for reflective LCD).

The Nikkei Technology reported how the two displays are physically intertwined so as to allow the screen to switch from one mode to the other. The OLED part of the display sits at the back of a reflective LCD, with its emitted light being transmitted through holes cut in part of the reflecting electrodes. The reflective LCD and OLED displays are driven independently, their respective aperture ratios are 76% and 3.9%.

SEL’s hybrid display in OLED mode.
SEL’s hybrid display in R-LCD mode.

The lab was also able to reduce the display’s power consumption by driving it with IGZO oxide TFTs running at low frequency. The report says SEL optimized its display driving method to improve the display contrast of the OLED from 1,111:1 to 2,850:1. The prototyped display had a resolution of 768×1,024 with a pixel density of 292ppi.

Visit the Semiconductor Energy Laboratory at https://www.sel.co.jp/

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