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Pulse-width modulation (PWM) in OLED displays

Pulse-Width Modulation, or PWM, is one of the ways display makers can use to adjust the display's brightness. PWM is considered to be an easy (or cost-effective) way to control the brightness, but it has serious drawbacks, such as flicker that may cause eye strain and headaches. In this article we'll discuss PWM and its effects on OLED displays.

Display PWM duty cycles

PWM basics

PWM is easiest to understand in displays that use backlight, like LCDs. In LCDs that use PWM, the backlight is always on at its fullest brightness. If you want to achieve a lower brightness, you turn the display on and off in a very high frequency. This frequency is not perceived by the human eye, which usually sees anything that flickers faster than about 60Hz (60 times per seconds) as consistent. Some people, however, are much more sensitive to flicker.

OLED-Info's flexible, VR/AR, microdisplays, automotive and graphene OLED market reports updated to January 2018

Today we published new versions of our market reports - that cover the flexible, VR/AR, microdisplays, automotive 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 January 2018.

The OLED for VR/AR Market Report:

  • 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!

We got a Konica Minolta Pioneer OLED's Christmas flexible OLED card

A few days ago we posted on Konica Minolta Pioneer OLED (KMPO) and its demonstration of simple flexible OLED lighting panels integrated into packaging. My friend Takatoshi Tsujimura, CTO at KMPO, sent me this nice Christmas greeting card, which arrived yesterday, with an integrated small red OLED. The OLED has a mirror finish when off.

This was exciting to get, and the whole card is very well done and feels great. It's a very nice surprise to see something light up in such a thin paper card. KMPO calls this concept "thin paper products with functionality".

Mark your calendars - what are the OLED conferences to attend in 2018?

Conferences are a great place to learn about new development in the OLED industry and meet with fellow display professionals. There are many excellent OLED events coming up in 2018 in the USA, Europe and in Asia.

The following article will detail the most prominent OLED events. If you plan on attending other events (or if you are organizing an OLED event unlisted in our event directory) be sure to comment below.

SID DisplayWeek (May 20-25, Los Angeles, USA)

The Society for Information Displays (SID) holds its annual DisplayWeek in May, and if you can only make it to one OLED conference, DisplayWeek is a top choice. The week-long activities include symposiums, seminars, courses and a 4 day exhibition. DisplayWeek 2018 is a great way to check out many OLED demonstrations and new display innovations.

Royole set to launch a new OLED tablet

Update: it seems this is an E Ink (monochrome) device and not an OLED one...

According to our sources, flexible OLED developer Royole is set to release a new tablet device that uses an OLED display. The tablet, which will be called the Royole RoWrite Wordpad, will have a display sized at around 6-7 inch. Royole did not officially announce the device yet.

Royole is constructing a 5.5-Gen flexible OLED production facility in Shenzhen, China. The new fab is scheduled to begin operation in 2018 and will have a monthly capacity of 45,000 substrates. In addition to flexible OLED production and R&D, Royole also develops VR headsets, and in 2016 Royole launched its first product, the Royole Moon foldable VR headset - that uses OLED microdisplays to achieve a PPI of over 3,000.

On Burn-In vs Image-Retention and LG's new P-OLED displays

In September 2017 LG Display started shipping its new 6" 1440x2880 (538 PPI) P-OLED displays, which are adopted so far by two smartphones - the LG V30 and Google's Pixel 2 XL. On paper these displays are superb, but actual reviews were rather dismal - to the point that some reviewers say that these are simply "bad displays".

Google Pixel 2 photo

The reviews mentioned bad color reproduction, graininess and problematic viewing angles - and many consumers also reported serious burn-in issues. Samsung has recently started a marketing campaign that says that LG OLED TVs also suffer from image retention problems. In this article we'll explain what is burn-in, the difference between burn-in and temporal image-retention and also try to shed some light on LG's latest OLED problems.

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Two basic marketing options exist: banner campaigns on the OLED-info website and newsletter (starting at $400 per month) are an effective and affordable way to place your message and brand in front of OLED professionals and decision makers on a daily basis. Sponsorship deals, that come in various forms, are a great way to enhance visibility in our website and newsletters. Starting at only $500 per year, OLED-Info's sponsors can send direct messages to our readers to introduce new or existing services or products and enhance their brand and awareness in the industry.