Highly enhanced light extraction from organic light emitting diodes with little image blurring and good color stability

Top-emitting organic light-emitting diodes integrated with thermally evaporated scattering film for reducing angular dependence of emission spectra

“…The emission color changes as the viewing angle is altered. To enhance the color stability of the emission, one simple way is mixing the emission from different angle [11][12][13][14][15][16][17]. If the emission from different angle is uniformly mixed, then the ultimately summarized emission becomes angularly independent as it contains information from all angles.…”

“…To solve the trade-off between color saturation and color angular stability, one clever way is equipping the top-emitting OLEDs with a diffusing film [11][12][13][14][15][16][17]. Light from different angle can be effectively scattered by the diffusing film, thus reducing the angular dependence of emission.…”

Eliminate angular color shift in top‐emitting OLEDs through cavity design

“…Many methods have been developed to reduce the optical losses in TEOLEDs. The waveguide mode can be extracted by incorporating corrugations within the device stack, attaching a hemisphere lens/micro lens arrays (MLAs), or coating scattering films on top of the devices . The SPP mode can be suppressed by replacing the metal electrode with transparent conductive oxide (TCO) such as indium tin oxide (ITO) or indium zinc oxide (IZO) …”

The suppression of viewing angle dependence of top emission organic light emitting diodes having strong microcavity characteristics by applying concave patterned anode

“…As a result, lots of technologies such as scattering glass, micro lens array, corrugated substrate, etc. were tried to reduce such kinds of loss mechanisms . Nevertheless, those technologies could not be applied to the display applications due to a pixel blurring effect .…”

“…were tried to reduce such kinds of loss mechanisms. [5][6][7][8][9][10] Nevertheless, those technologies could not be applied to the display applications due to a pixel blurring effect. 11,12 To overcome this side effect, we enhanced the light power by microcavity structure, although such device show very narrow angular emission pattern and large angular color shift.…”