婆罗门
精华
|
战斗力 鹅
|
回帖 0
注册时间 2007-3-6
|
本帖最后由 downforce 于 2020-11-4 23:58 编辑
In a newsletter published by the OLED Association, LG Display has confirmed that the VRR gamma shift issue on LG OLED TVs including the CX and C9 is caused by the underlying OLED panel. While the company is investigating the possibility of introducing multiple gamma curves at lower refresh rates, the fix will be hardware/ T-Con-based, and can only be applied to future OLED TVs and not existing ones.
就是VRR模式下gamma会飘，而且是面板本身造成的无法通过软件的方法来修复。
https://www.youtube.com/watch?v=Jfl3UdWZIUQ
https://youtu.be/NrRUTqfB_Ts?t=889
问题解释全文
https://www.oled-a.org/lgersquos-48rdquo-oled-attracting-game-monitor-buyers_9620.html
Earlier this year, LG launched the first 48-inch OLED TV. The TVs have reportedly been in high demand since launch and sales were boosted by the general stay-at-home entertainment boom from the global coronavirus pandemic. LG reports unexpected demand from gamers. 48-inch OLEDs are not cheap but smaller LCD gaming monitors with similar features, and subpar picture quality, can often cost the same or more. 40+-inch LCD TVs typically lack advanced features to keep costs down. LG's 48-inch CX OLED TV on the other hand offers HDMI 2.1, HDMI VRR, AMD FreeSync, and Nvidia G-Sync Compatible. Sony also launched a 48-inch OLED TV, but it lacks many of the gaming features found in LG's model. Additional TV makers are expected to launch 48-inch OLED models later this year.
Forbes’ reported LGE’s 2019 and 2020 OLED TVs variable refresh rate (VRR) implementation sometimes causes the image to undergo a brightness/gamma shift that makes dark areas in games look greyer and more washed out than they do with VRR turned off. By toggling the AMD FreeSync feature in the LG OLED TVs menus on and off with the Gears 5 HDR calibration screen playing with the VRR feature on, the black floor is raised and, as a result, there’s less visible shading detail in the dark areas of the left side of the Gears 5 calibration image, which is noticeable when the TV’s instant game response feature is turned off and switched to a picture preset other than the Game. There are also reports of noticeable instability/flickering in some dark gaming image areas when using VRR on LGs 2019 OLEDs.
According to LGD, the cause is the OLED Panel not the OLED TV set. Gamma for OLED is optimized and fixed for 120Hz by establishing a fixed charging time for OLED sub-pixels. VRR is used when the frame rate is less than 120 Hz. When the OLED TV uses framerates less than 120Hz, the gamma curve is inconsistent with the frame rate. For example, a 40Hz frame rate is longer than 120Hz frame rate. Therefore, the lower frame rates results in sub pixels that are overcharged, causing flickering of dark gray images, which is noticeable for dark images rather than bright ones, because human eyes are more sensitive to low gray colors. LGD will likely solve this problem establishing multiple gamma curves optimized for lower frame rates. 今年早些时候，LG推出了首款48英寸OLED电视。据报道，这款电视自上市以来需求量很大，全球冠状病毒大流行带来的普遍待在家里的娱乐热潮也促进了销售。LG报告称，游戏玩家的需求出乎意料。48英寸OLED并不便宜，但功能类似、画质不佳的小型液晶游戏显示器的价格往往相同或更高。40英寸以上的液晶电视通常缺乏先进的功能来降低成本。LG的48英寸CX OLED电视则提供了HDMI 2.1、HDMI VRR、AMD FreeSync和Nvidia G-Sync兼容。索尼也推出了一款48英寸OLED电视，但它缺乏LG机型中的许多游戏功能。预计今年晚些时候还会有其他电视制造商推出48英寸OLED机型。 福布斯》报道称，LGE的2019年和2020年OLED电视的可变刷新率（VRR）实施有时会导致图像发生亮度/伽马转变，使游戏中的黑暗区域看起来比关闭VRR时更灰暗，更冲淡。通过在LG OLED电视菜单中切换AMD FreeSync功能，在开启VRR功能的情况下播放Gears 5 HDR校准画面，黑底会被抬高，因此，Gears 5校准画面左侧的暗部区域的阴影细节不那么明显，当关闭电视的即时游戏响应功能并切换到游戏以外的画面预设时，就会有明显的阴影细节。还有报道称，在LGs 2019年OLED上使用VRR时，部分暗部游戏画面区域会出现明显的不稳定/闪烁。 据LGD介绍，原因是OLED面板而非OLED电视机。OLED的Gamma是通过为OLED子像素建立固定的充电时间，对120Hz进行优化和固定。当帧率小于120Hz时使用VRR。当OLED电视使用帧率小于120Hz时，伽玛曲线与帧率不一致。例如，40Hz帧率比120Hz帧率长。因此，较低的帧率导致子像素过高，造成暗灰色图像的闪烁，这对于暗色图像而不是亮色图像来说是很明显的，因为人的眼睛对低灰度颜色更敏感。LGD将可能解决这个问题，建立多个针对低帧率优化的伽玛曲线。 通过www.DeepL.com/Translator（免费版）翻译
X9000H 会在 HDMI 2.1 4K 120Hz 下产生不可修复的模糊问题
https://www.chiphell.com/thread-2273139-1-1.html
|
|
沪公网安备 31010702007642号 )
发表于 2020-11-4 15:33
黑的部分会发灰甚至闪烁，oled最大的优点没了么，所有的c9和cx都有问题吗？发布了这么久才出新闻，是不是大家其实不怎么在意黑色是不是够黑
