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54.3: Invited Paper: Ultra‐high Contrast LCD Displays: Enabling Pixel‐Level Dimming with Dual‐Cell OLCDs
Author(s) -
Cain Paul
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.15235
Subject(s) - liquid crystal display , polarizer , compensation (psychology) , pixel , liquid crystal on silicon , materials science , substrate (aquarium) , contrast (vision) , contrast ratio , dual (grammatical number) , optoelectronics , computer science , process (computing) , optics , artificial intelligence , physics , psychology , art , oceanography , birefringence , literature , psychoanalysis , geology , operating system
An increasingly common approach to significantly increasing contrast of an LCD is to use a dual cell structure, and there are now a growing range of TVs shipping that use this approach on glass. Whilst these glass‐based dual cell HDR displays have many strengths, there are some trade‐offs that arise because of the significant inter‐cell separation caused by the thickness of the glass substrates, which is much larger than the pixel pitch for TVs. Some of these limitations can be overcome with additional compensation films, but this introduces additional cost and further trade‐offs. FlexEnable's low temperature organic TFT process allows LCD cells to be built on plastic film instead of glass (OLCD), allowing the inter‐cell separation to be reduced drastically. We summarize recent work where in a first case ultra‐thin TAC film is used as a substrate, and then take this further in using the polarizer itself as the substrate. This will enable not only the contrast but also for the first time true pixel‐level dimming akin to OLEDs, but with LCD‐like cost structure.