The monitor industry advertises full screen white brightness. Say there is an LCD that has 250 cd/m² brightness when displaying white. When its displaying colors, the brightness will be a lot lower than 250 because LCD generates colors by blocking light. Red is generated by blocking blue and green and alllwing red to pass through. So a 250 cd/m² LCD screen when displaying full screen red can only display 83 cd/m².
OLED will stay a lot closer to 250 cd/m² in color scenes. Say you are displaying red on the screen. Green and blue sub pixels are powered off. The electric power which would have been used to power green and blue can be diverted to red subpixels, allowing you to get red brightness much greater than 83 cd/m². This is because while LCD displays colors by blocking light, OLED generates colors by having millions of tiny red, blue, green lights. So if some pixels are being less bright, that power can be diverted to other pixels. This is where 1000 cd/m² peak brightness comes in. If a scene in a movie has a small part of the scene as very bright... OLED can divert power to allow that bright part to reach 1000 cd/m².
The end result of all this is that when displaying actual scenes, a 250 cd/m² OLED is significantly brighter than a 250 cd/m² LCD.
And you are right this does stink because if someone hasn't studied how displays work, they will look at 250 cd/m² LCD and 250 cd/m² OLED and say they are the same. That is correct.. only when displaying full screen white. In an actual scene from a movie/game, the OLED will be significantly brighter. But the numbers don't convey that at all.
Here is an example of what I am talking about in terms of brightness.
Left is LG C1 OLED. Right is Sony X85J LCD.
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OLED gets brighter as you move away from a 100% white scene to 50% white scene. But it makes no difference to LCD. In a real scene, the OLED is
a lot brighter (628 cd/m²) than what its 125 cd/m² would suggest.
The DisplayHDR 400 True Black certification requires:
- Sustained 10% window be >= 400 cd/m²
- Sustained 100% window be >= 250 cd/m²
The LG C1 meets the 10% window target (725 cd/m²) but fails to meet the 100% window target (125 cd/m²) and thus isn't certified.
The Alienware can do 250 cd/m² at sustained 100% window and 450 cd/m² at 10% sustained window. The 1000 cd/m² is for 2% window. From the specifications, it looks like it will be good only for completely dark room HDR.