What They Say
We had a number of queries about the latest LG Display EX WOLED panels so we contacted the firm to get clarification. Happily, they did clarify.
- LG Display clarified that the EVO heat sink technology that was advertised last year was a sub-brand of LG Electronics, not LGD. That makes sense as Panasonic was the first to adopt this idea, I think.
- On the EX technology, I had been a bit confused about how the AI to assess pixel degradation could impact the light output. However, if the per-pixel compensation did not now rely on the sensing of the pixel, but on, effectively the cumulative load on the pixel, calculated by the AI, that would affect the aperture ratio of the panel as you could reduce the complexity of the connections on the panel and possibly the transistor structure. That would boost the brightness. LGD confirmed that, broadly (the firm wouldn’t go into detail and was cagey in what it said), that is what is happening and that there are ‘less metallic lines in the TFT’.
- The firm confirmed that full white on the OLED EX is now 200 cd/m² while 25% window is 500 cd/m²
- The narrower bezel is enabled by optimised driving circuitry and ‘Gate in Panel’ (GIP) driving
- All of LGD’s WOLEDs from Q2 2022 will adopt the EX technology.
What We Think
I’m pleased to have got this response from LGD and feel a bit more comfortable about the claims. What I learned would suggest that LG Electronics could still use the EVO technology to improve the EX panels. It’s not unreasonable to assume that after a lot of testing, it was better able to predict the degradation at the pixel level better than it could in the early years of OLED. I assume that some level of compensation is still needed to account for manufacturing uniformity issues.
The news that all the panels will adopt EX makes sense from a production point of view, but will reduce the possibility of being able to differentiate different levels of panel pricing. Of course, the EVO concept can still do that for set makers. (BR)
