Design of Micro-Structured Trapezoidal Array Film in Application of Organic Light-Emitting Display with High Normal Luminance and Eliminating Blur Effect
Date Issued
2012
Date
2012
Author(s)
Jiang, Jeng-Ren
Abstract
In the application of flat-panel display, the problem to be solved on organic light-emitting diode (OLED) is low out-coupling efficiency. It has been confirmed that micro-structure attachment on the surface of glass substrate is a beneficial method for raising the light extraction efficiency. However, for the pixels of display, their image may well encounter blur effect among themselves due to the adjacent light-tracing from the above micro-structure.
In this thesis, we simulate for the optical model through optical simulation software LightTools® by using the method of geometric ray-tracing. As applying an attachment of micro-structured trapezoidal array films (mTAFs) with pixel-alignment, we can ensure that the OLEDs maintain a high output optical power as well as enhance the gain of luminance intensity at the normal direction with removing blur effect, which fits the specification of device itself by tuning the parameters of the structure. Under the condition of glass substrate thickness of 450 μm, the respective pixel size of , and pixel spacing of 100 μm, it allows the luminous power efficiency of the OLEDs to obtain an enhancement 61.5%, and can reach the best value of 2.59 times the gain of luminance intensity with removing the blur effect.
Furthermore, we arrange another design for the actual specification of an active-matrix organic light-emitting diode (AMOLED), and select the previously researched center-hollowed microlens array films (MAFs) to make a comparison. However, as we consider the results of luminance distribution under the different oblique viewing angles, it reveals that the micro-structure on the specific position still suffers from the phenomenon of crosstalk. As a result, we finally have a summarization for the micro-structure applying to display devices. As aspects of all-angular coupling optimization, it requires further modification in the actual design.
Subjects
optical simulation
micro-trapezoidal array films(mTAFs)
organic light-emitting displays
light-extraction efficiency enhancement
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-101-R99941081-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):d8a7db46772fe02102018b1230f02e8d