Stacked OLEDs
Stacked OLEDs use a pixel architecture that stacks the red, green, and blue subpixels on top of one another instead of next to one another, leading to substantial increase in gamut and color depth, and greatly reducing pixel gap. Currently, other display technologies have the RGB (and RGBW) pixels mapped next to each other decreasing potential resolution.There are two types of OLED technology, Passive-Matrix (PMOLED) and Active-Matrix (AMOLED). Active-Matrix requires electronics to switch each pixel on or off individually, which is better for displaying motion and therefore the type used for OLED TVs.
So far, only two manufacturers have launched OLED TVs in the UK – LG and Samsung (the latter back in 2013). But there is a crucial difference between the OLED technologies used by LG and Samsung, relating to the sub-pixel structure. In its OLED TVs, Samsung uses a traditional red, green and blue (RGB) pixel structure with no colour filters, just like you’d find on a plasma.
By comparison, LG OLED TVs use WRGB 4-colour pixel technology, which adds a fourth white sub-pixel. White light is shone through a colour filter to create the red, green and blue sub-pixels. LG says this results in a brighter picture.
Another of OLED’s problems concerns the pesky blue pixel. Because the OLED material used to make blue light deteriorates more quickly than red and green, its lifespan is shorter and over time the colour balance could be affected.За това говоря.The biggest technical problem for OLEDs was the limited lifetime of the organic materials. One 2008 technical report on an OLED TV panel found that "After 1,000 hours the blue luminance degraded by 12%, the red by 7% and the green by 8%."[69] In particular, blue OLEDs historically have had a lifetime of around 14,000 hours to half original brightness (five years at 8 hours a day) when used for flat-panel displays.