AHVA IPS

Note: I am working on a review of BenQ’s PD3200U and started to dig into AHVA, which is the wide viewing angle display technology used in the 32-inch UHD IPS LCD panel. Instead of adding this portion to the review I’ve decide it would better serve DISPLAYBLOG readers to have a separate article detailing AHVA.

AHVA stands for Advanced Hyper-Viewing Angle and is developed by AU Optronics (AUO). The ‘VA’ portion of the name is not connected to Vertical Alignment, therefore AHVA does not exhibit color and gamma shifts at wide viewing angles. There are many varieties of IPS technologies such as e-IPS, H-IPS, P-IPS, S-IPS, etc. And there are other IPS-like liquid crystal orientation and manipulation technologies such as Super PLS (Plane to Line Switching) developed by Samsung.

AUO began investing in the company’s own IPS-type wide viewing angle LCD technology in 2012. Performance and specifications are similar to LG Display’s IPS and Samsung’s PLS technologies. Starting around 2015 or so brands equipped their smartphones, tablets, laptops, monitors, and TVs with IPS LCDs to show potential customers their devices featured the best in display technology. For those who need color accuracy there is no better LCD technology than IPS — AUO as well as all of the major LCD manufacturers knew that — and AUO’s AHVA is the company’s IPS offering.

This is a slight tangent, but targeting the rapidly growing gaming market AUO was first to offer 144 Hz AHVA LCD panels in September 2014. The model number was M270DAN02.3 and you can find technical specifications at Hexus and Panelook. Here’s a partial list of the earliest monitors to have incorporated AUO’s 144 Hz AHVA LCD (source: PC Hardware Help): Acer XB270HU (27-inch, 2560×1440, NVIDIA G-Sync), Acer XF270HU (27-inch, 2560×1440, AMD FreeSync), Acer XR341CK (34-inch, 3440×1440, NVIDIA G-Sync), ASUS PG279Q (27-inch, 2560×1440, ULMB1, NVIDIA G-Sync), Enzo Foris FS2735 (27-inch, 2560×1440, AMD FreeSync), and Nixeus EDG 27 (27-inch, 2560×1440, AMD FreeSync).

AUO is based in Taiwan and was originally Acer Display Technology, founded in August 1996. In September 2001 Acer Display Technology and Unipac Optoelectronics Corporation merged and renamed the merged company as AU Optronics. Later, in October 2006, Quanta Display was acquired (source: Wikipedia).

Footnote:

  1. ULMB stands for Ultra Low Motion Blur. NVIDIA designed and developed ULMB to reduce motion blur by using strobing, similar to how a CRT display operates. ULMB’s benefits of reduced motion blur is most noticeable in fast-paced FPS (first-person shooter) games. Unfortunately ULMB cannot be used at the same time as G-Sync. (Only NVIDIA G-Sync enabled monitors allow ULMB mode.) A negative is a decrease in picture quality and brightness in ULMB mode. One possible additional negative of ULMB is that some people who are extra sensitive to flickering might notice flicker on the monitor (source: BlizzGC).

Google Pixel 2 XL: Display Problems

Google’s Pixel 2 XL is built by LG. The plastic OLED, or POLED, display is supplied by LG Display. Here is a list of display-related problems some Pixel 2 XL users are reporting:

  • Muddy color
  • Grainy texture in low light
  • Burn in

The burn in issue is particularly troublesome since it is most likely a hardware issue. The muddy color and grainy texture problems can potentially be fixed with a software update, but not burn in.

This is how to check to see if your Pixel 2 XL has burn in: change your background wallpaper to a file with a solid light gray and pay attention to the area where the navigation buttons are on the bottom. Bring up the navigation buttons and then hide them. If you see remnants of the navigation buttons but they don’t disappear within a few seconds there’s a good chance your display is experiencing some level of burn in with the likelihood that it will get worse as you use it more.

According to Android Authority, LG Display’s POLED uses a polyamide plastic substrate, a plastic material that is more suitable for the high manufacturing temperatures. This is not the first time LG Display has manufactured OLED displays — remember the G Flex? — but the display size was 6 inches, its pixel format 1280×720 in landscape orientation, with a resolution of 245 ppi. The current OLED display featured in the Pixel 2 XL is also 6 inches, but the number of pixels have increased dramatically with a pixel format of 2880×1440 (landscape) for a resolution of about 538 ppi. Manufacturing OLED displays with that many pixels with high yields is extremely difficult and that’s why it has taken Samsung several years to perfect its smartphone OLED display manufacturing methods.

Pushing the bleeding edge of display manufacturing technology can and usually results in bumps along the way and it isn’t surprising to see what seems to be a display hardware defect like the one on the Pixel 2 XL. Like Samsung it might take LG Display a few more tries to perfect the science and art of smartphone OLED manufacturing with plastic substrates.

Source: The Verge, Android Central

Google Seeks Strategic Investment & Relationship With LG Display To Secure OLED Smartphone Displays

Google Pixel

According to Korea-based ETNews (Korean), Mountain View, California-based Google has approached LG Display and offered a strategic investment of ₩1 trillion (around US$880 million) toward constructing a single line in a Gen. 6 small/medium flexible OLED fabrication plant. Instead of engaging LG Display toward establishing a long term supply agreement Google is seeking to establish a strategic relationship with one of the world’s largest supplier of displays.

Google is most likely experiencing difficulties acquiring OLED displays for its flagship Pixel smartphone. The world’s dominant supplier of smartphone OLED displays is Samsung, but Samsung will be using its own OLED supply for its newly launched Galaxy S8 and S8+ smartphones. In addition there is speculation that Apple has secured most of the rest of Samsung’s OLED capacity for the next iPhone, which is expected to be named iPhone 8 or iPhone X. With Samsung’s OLED capacity earmarked for the Galaxy S8, S8+ and the next iPhone, Google needed to find another supplier and for the long term. The switch from LCD to OLED is underway and when Apple signals the smartphone world that OLED is the display technology of choice with its next iPhone all major brands will probably transition to OLED as well especially for their high-end smartphone offerings.

LG Display Paju Cluster

LG Display is currently building out two Gen. 6 flexible OLED fabrication plants: E5 in Gumi and Paju-based E6. E5 is expected to start production in Q3’17 while E6 is slated to come online in the second half of 2018. About $1.7 billion will be invested toward constructing the Gen 6 (1500x1850mm) flexible OLED fab; E6 is expected to have a monthly input capacity of 15,000 substrates. LG Display has invested $900 million to build its E5 fab, which is slated for production in 1H’17 with an initial monthly input capacity of 7,500 substrates or about 1.5 million 5.5-inch flexible OLED displays.

If Google and LG Display sign a strategic investment agreement flexible OLED displays earmarked for Google will probably be manufactured at LG Display’s E5 fab. Google’s investment would be coming at an important time for LG Display as the company builds its flexible OLED capacity for smartphones and other small/medium applications.

LG Display has been the main supplier of displays to Apple for many years. Apple’s iPhones, iPads, iMacs, MacBooks, etc. are mostly supplied by LG Display due to the company’s well received and superior IPS LCD technology. But if Apple switches to OLED displays for the company’s iPhones it will be a major blow to LG Display. Samsung has been honing its smartphone OLED display technology for many years and it will likely be an uphill battle for LG Display to catch up. Although Apple might use LG Display as a second or third supplier of flexible OLED displays in the future, the probability that it will be sooner than later seems low. LG Display needs Google as much as Google needs LG Display.

Google is expected to announce a new Pixel smartphone this fall and to secure a reliable supply of flexible OLED displays via a strategic relationship with LG Display makes a lot of sense.