Dimming problem when subtitles appear on 32PFL9705 (and 40/46" & 9955/9956/9606/9706)
Hello again everyone!
This time I would like to point out, what I think is, a bug in the "Dynamic Backlight" dimming function on every 32" PFL9705 and at least some (if not all) 40" and 46" PFL9705, the 58" PFL9955, plus the latest 58" PFL9956, 40" and 52" PFL9606 and even the 46" PFL9706. This bug can be very annoying, especially in darker scenes.
Put this on USB to watch with Dynamic Backlight activated:
In this short sample I made of the movie "Entrapment" (never mind the fuzziness, it was big enough already), you can clearly see the dimming of the upper part of the picture every time subtitles appear at the bottom.
Why!?... It may be to increase contrast even further (unnecessary, as it is strong enough), but I would rather leave parts of the picture where nothing is changing alone. Because when you don't, the dimming (every time subtitles appear) and undimming (every time they disappear again) is very apparent, as nothing should be changing in those parts at all.
Please Philips, it would be great if you could improve the Local Dimming function at this point, as I think it is the last big disadvantage of an otherwise great feature!
Thanks again in advance! And enjoy Sean and Catherine...
Last edited by Freddy; 08-15-2012 at 03:02 PM.
sadly i must give you my full agreement about this bug you have found.
it makes absolut no sense to dim the picture while the subtitle appears.
philips please fix this!
for all other users with a xxPFL9705 please test this too.
and give a short response here.
Last edited by mdiehl; 03-30-2011 at 04:58 PM.
Just a quick follow up.
Pointed out by Markus, I realized that this error as described by me, probably is not seen that much in countries where subtitles are quite rare.
But... the same happens when, for example, an announcement appears on screen or the name of a person is shown.
Once you've seen this, you'll notice it more and more often.
So... Philips?... I really hope you will be able to solve this as well as you've solved the Dark Backlight bands problem!
And yes, just as Markus asked all the other users: please test this too and report your results here.
I have the same dimming issue on my 32PFL9705. Very distracting.
I am surprised to hear that it does not occur on the 40" and 46" versions of this TV... this indeed suggests that it is a bug and that it should be (easily?) fixable on the 32"...
I've tested your video sample on my 32PFL9705H/12 (fw 0.140.32.0) and I've got the same problem, just as you described.
I've tried also to change the video settings (normal, live, energy saving, etc.) and the problem remain.
I think is the same behavior that the tv has when it shows information messages (eg. when you select the option to disable the "light sensor", the tv shows a pop-up box that is brighter than the rest of the image)
Yes indeed, that doesn't matter, as long as "Dynamic Backlight" is activated (Standard/Optimal).
Originally Posted by Adamo
Yes, that can trigger it too when the picture is dim enough. Turning the sound on or off is another example.
Originally Posted by Adamo
Same local dimming problem as described above!
Very annoying, hope it will be solved in the next software update...
Dynamic backlighting: The name already explains what it does; Normally the backlight brightness is fixed. In some Philips TVís you can choose to make it dynamic. At dark scenes or pictures there will be more brightness of the backlight and at bright scenes there will be less brightness. The backlight brightness is based on the average light output.
It is a great feature when you watch a picture slideshow or movies without subtitles.
It is annoying when watching a movie with subtitles. The subtitles are in bright white; they make a big change in the average screen brightness, so the TV is responding to that for the whole screen.
If you donít like it, turn it off! So, it is not a bug and it canít be fixed in these TVís.
In the ďhigh-end rangeĒ this is not an issue. There the backlight is a comlete matix of LEDís behind the LCD screen. Every bright spot in the picture is lighted-out locally. So brightness of subtitles do not affect brightness elsewhere on the screen.
By turning off the dynamic backlight you loose a lot of black, and the image dosn't look that great. If everyone was thinking like you, there would be no improvements in this world!
Originally Posted by DellUser
I have the same problem with my 46PFL9705.
That's really interesting, as so far I've only had reports from 32PFL9705 owners here.
Originally Posted by Frezzaldo
So just to be sure, when watching the "Entrapment" fragment I posted, you also notice the dimming of the upper part of the picture when subtitles appear, and the subsequent brightening of the picture when the subtitles disappear again?...
When i watch the SubtitleDimming.mpg I can see the problem that you also notice. I can see a change in the area around the subtitles. I also, not alle the time, notice a change in the rest of the image when subtitles comes on. This is the same problem that I have when I watch blurays. On my TV this change can happen both when subtitles are on and off, but more often when subtitles are on.
Originally Posted by Freddy
I've tried your test image with my 32pfl9705H/12 (fw ver 0.140.36.00): same problem for me...
I hope that Philips will solve this issue.
same problem here with your new test image.