An OLED display uses a new technology called OLED (Organic Light Emitting Diodes). OLED screens are brighter, more efficient, thinner and feature better refresh rates and contrast than LCD or Plasma.
OLEDs are made by placing thin films of organic (carbon based) materials between two conductors. When an electrical current is applied, a bright light is emitted. Since the OLED materials emit light, a backlight is not required (unlike LCDs).
OLEDs in mobile phones
Mobile phones that boast OLED screens are rapidly becoming more prevalent, with over 500 million AMOLED screens produced in 2018 - mostly to satisfy demand from mobile phones. Samsung has been using AMOLEDs in its high-end phones for many years, and most phone makers are also starting to adopt OLED displays (including Apple, LG, Xiaomi, Huawei, Oppo, Vivo, Lenovo, Motorola, and others.
OnePlus launched it latest flagship smartphones, both of whom utilize high-end AMOLED displays. We'll start with the OnePlus 7 Pro - a flagship smartphone that features a large 6.67" 90Hz 1440x3120 Fluid AMOLED - which apparently is a 90Hz Super AMOLED. This is a full-screen display that has an under-the-display fingerprint sensor.
The OnePlus 7 has a smaller notch-type 6.41" 1080x2340 Optic AMOLED - which is again OnePlus' own display marketing term for an SDC's Super AMOLED. It seems as if OnePlus brands its regular 60Hz AMOLED displays as Optic Displays - and its higher-end 90Hz ones as Fluid AMOLEDs.
Samsung says that it has "reviewed" the defects caused by particles that entered the device below the screen. Samsung will strengthen the durability of the exposed area on the hinge of the phone and will minimize the gap between the protective layer and the bezel of the main display in order to prevent any external substances from penetrating the device.
Customers who pre-ordered the $1,980 Galaxy Fold were sent this message: "If we do not hear from you and we have not shipped by May 31st, your order will be canceled automatically". Samsung says that according to US regulations, it was required to send this message and cancel orders if the Fold will not ship before May 31.
According to their analysis, the Galaxy Fold design has a weakness - and dust or other particles could enter the phone through the gaps in the top, bottom and the back of the device. This could create "bumps" on the display as the foldable display is pressed against the backside of the phone when fully folded. iFixit speculates that this could be the cause of the some of the reported display failures (another possible problem could be the removal of the protective top polyimide film).
According to the Wall Street Journal, Samsung wants to "fully evaluate the feedback and run further internal tests". Samsung will announce a new release date int he coming weeks. Samsung did not fully disclose its initial findings and does not give a full explanation to what went wrong with these review units. Samsung did, however, state that "Initial findings from the inspection of reported issues on the display showed that they could be associated with impact on the top and bottom exposed areas of the hinge. There was also an instance where substances found inside the device affected the display performance."
According to Anandtech, who posted an extensive review of the P30 and P30, the supplier for the smaller 6.1" AMOLED on the P30 is indeed Samsung Display, but Huawei uses both LG Display and BOE as suppliesr for the large 6.47" AMOLED on the P30 Pro.
Only yesterday we reported that early reviews of the Galaxy Fold are very positive and that Samsung says there's overwhelming demand for the new foldable device - and today we have much less positive news.
At least 4 early Galaxy Fold reviewers report that only after one day of use, the screens on their devices broke. The Verge's Dieter Bohn says that a bump appeared on the crease of the phone, which quickly broke the screen - even though he did not perform any stress tests or anything - just normal phone use.
Samsung Electronics started to accept pre-orders for the Galaxy Fold a few days ago (April 14th) - and the company says it is already sold out due to "overwhelming demand" and it is no longer taking pre-orders
LG Display currently produces flexible OLEDs (branded as pOLEDs), for both wearable devices and smartphones, is the exclusive supplier of AMOLED displays for Apple's Watch smartwatch (although this could change soon) and it also supplies OLED displays for various smartphones, including the company's own flagship phones.
LG Display has been struggling, though - with low yields, poor display quality and securing orders. According to a new report from Business Korea, there is some skepticism regarding the viability of this business - including some inside LG Display's management itself.
Samsung Display announced today that it has started to mass produce foldable OLED displays, shipping the first such displays to Samsung Electronics.
SDC's first foldable OLEDs are the inside-folding 7.3" 1536x2152 Infinity Flex AMOLED displays that will be used in the Samsung Galaxy Fold - which will start shipping later this month (for $2,000) in Korea and Europe.