OLED displays use organic materials that emit light when electricity is applied. OLEDs enable emissive, bright, thin, flexible and efficient displays. OLEDs are set to replace LCDs in all display applications - from small displays to large TV sets.
PMOLED: Passive Matrix OLED
PMOLED stands for Passive-Matrix OLED, which relates to the way you control (or drive) the display. A PMOLED display uses a simple control scheme in which you control each row (or line) in the display sequentially (one at a time). PMOLED electronics do not contain a storage capacitor and so the pixels in each line are actually off most of the time. To compensate for this you need to use more voltage to make them brighter. If you have 10 lines, for example, you have to make the one line that is on 10 times as bright (the real number is less then 10, but that's the general idea).
So while PMOLEDs are easy (and cheap) to fabricate, they are not efficient and the OLED materials suffer from lower lifetime (due to the high voltage needed). PMOLED displays are also restricted in resolution and size (the more lines you have, the more voltage you have to use). PMOLED displays are usually small (up to 3" typically) and are used to display character data or small icons: they are being used in wearable devices, small gadgets and sub displays
PMOLED vs AMOLED
The other kind of OLED display is called an AMOLED (or Active-Matrix OLED). An AMOLED uses a TFT that contains a storage capacitor which maintains the line pixels lit all the time (even though just one line is changed each time). AMOLEDs consume less power than PMOLEDs, have faster refresh rates and allows to build larger display with higher resolutions. AMOLEDs are also more complicated and expensive to fabricate.
Flexible and transparent PMOLEDs
Some small and simple flexible (conformable) PMOLED displays are already on the market. Japan's Futaba for example is producing several such displays, including a 1.4" 128x16 film PMOLED display adopted in several fitness bands from Garmin, HTC and others.
Transparent PMOLEDs are currently in development, with some segmented panels already on the market - but as of early 2018, no dot-matrix transparent PMOLEDs are available.
Looking for PMOLED suppliers?
Are you looking to adopt an PMOLED display for your device? Today there are several PMOLED producers (mostly in China and Taiwan), each making their own kinds of standard and custom PMOLED displays, with a total of dozens of different displays on the market.
The PMOLED Market Report
If you want to fully understand the PMOLED market and industry, check out our PMOLED Market Report. This comprehensive report explains:
- PMOLED production fabs
- Next-generation PMOLED technologies
- Flexible and transparent PMOLEDs
- PMOLED for automotive applications
The report package also provides datasheets and product catalogs and a detailed list of PMOLED producers.
The latest PMOLED news:
Solomon Systech launched a TDDI (Touch and Display Driver Integration) IC for PMOLED displays. The new SSD7317 (the world's first PMOLED TDDI IC) integrates touch and display microelectronics in a single chip and can enable thinner and lighter form factors and reduced manufacturing time and process - and higher display quality (higher light transmission) and touch performance.
Solomon explains that the SSD7317 adopts a proprietary time multiplexing approach for display driving and in-cell touch detection, thereby enabling touch detection on traditional PMOLED display module with no modifications needed on the existing display module structure. Unlike traditional out-cell touch solutions (with separate display and touch IC) which need a dedicated ITO layer for touch sensor, the SSD7317 eliminates the touch ITO and PET substrate layers in addition to the bottom Optically Clear Adhesive (OCA).
Transparent displays are of great interest, and many envision a plethora of possible applications that use transparent screens in the retail, commercial and consumer markets. There are many exciting applications - but none with real and immediate demand.
Many OLED makers are developing transparent OLEDs, and in the past we've seen several producers that introduced such displays to the market - only to halt production a few months later. Device makers are on the lookout for such displays, and are still disappointed even though the technology is ready.
OLED-Info's flexible, VR/AR, microdisplays, PMOLED, automotive and graphene OLED market reports updated to July 2018
Today we published new versions of our market reports - that cover the flexible, VR/AR, microdisplays, automotive, PMOLED and graphene OLED markets. OLED-Info provides comprehensive niche OLED market reports, and our reports cover everything you need to know about the niche market, and can be useful if you want to understand how the OLED industry works and what this technology can provide for your own industry. The reports are now updated to October 2018.
- Why OLEDs are adopted in almost all VR HMDs
- What kind of displays are required for VR and AR applications
- What the future holds for the VR and AR markets
- Current and future VR and AR systems
The report package provides a great introduction to the emerging VR and AR market, and details the role that OLED displays will have. Read more here!
Visionox announced a complex restructuring move, that seems to indicate that the company (which recently reversed-merged with Black Cattle Foods) aims to focus on its AMOLED business and sell its PMOLED business.
The new restructuring, or the PMOLED business sale, involves several China-based companies - including local municipalities, financial investors and even a travel company.
Futaba launched its flexible (film-type, curvable) 1.8" 160x32 monochrome white PMOLED back in November 2015, and we have now added this interesting panel to our OLED Marketplace.
Kyulux and Wisechip unveiled a flexible PMOLED display that uses Kyulux’s Hyperfluoresence yellow emitter. Wisechip says that the power consumption of this display is almost half of Wisechip's regular fluorescent yellow PMOLED.
The first flexible HF PMOLED is a 1.71″ 256x64 display, that is now ready to be produced (Wisechip says this will enter mass production before the end of 2018). Wisechip originally aimed to introduce its first glass-based HF yellow emitter PMOLED by the end of 2017, but it seems they decided to jump straight to a flexible panel.
Japan-based Futaba demonstrated its latest automotive, flexible and transparent PMOLEDs at SID 2018.
We did not see any new displays, but it was great to get an overview of the possible PMOLED solutions that Futaba offers to its target markets (mostly automotive and wearables).
China-based OLED producer Visionox had a very impressive booth at SID 2018, demonstrating the company's latest AMOLED and PMOLED displays and prototypes.
Visionox is now producing AMOLED displays for smartphones and wearables and the company showcased a wide range of AMOLED panels and also commercial phones that use these panels. Visionox also demonstrated many new display prototypes.
China PMOLED and AMOLED producer Visionox demonstrated its first transparent OLED at SID Displayweek, a small transparent blue panel (60% transmittance).
The tag next to the display said this was a transparent AMOLED, but it is more likely that it was a PMOLED display - after all it was a simple monochrome blue one. In any case it is great to see Visionox developing transparent displays, in addition to the other next generation technologies it demonstrated at DisplayWeek.
Thermal activation sensitized fluorescence, or TASF, is a new type of TADF OLED emitter material developed at China's Tsinghua University. During SID Displayweek, Visionox demonstrated the first TASF prototype display.
We do not have a lot of information on this new emitter technology, except what Visionox provided at the conference: a sky-blue color (468 nm, CIE: 0.153, 0.201), a luminous efficiency of 26.6 cd/A and an external quantum efficiency of over 17%. The brightness of this OLED PMOLED display was 800 nits.