Quote:
Originally Posted by barryem
The LCD on a tablet doesn't emit light. The LED backlight behind it does and it has to emit enough light up through the LCD to make the colors bright enough to see.
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Of course I know that, I would have hoped that you would have seen that I was just being economical with words (and echoing those words used by many others here) as I believe that I have through my posts indicated that I have a very good knowledge of technologies. And for the sake of clarity I will make it clear here that I am also aware that AMOLED/OLED actually do emit light.
Quote:
Originally Posted by barryem
Yes that does diffuse the light somewhat but in a white background it's still sending a lot of light through the LCD.
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That may be in part correct when inside of or outside of many apps, that depending on the panel. But, by way of example, in the case of the reading app that I use (Android version of PocketBook) one can, while within a book itself, modulate even a pure white (RGB 255,255,255) background (and, of course, other whites on the screen too, such as in color images) up and down from very bright down to so dark that black text (or that of any other color
) is not readable.
That is done with a simple vertical gesture on the screen while the book is open. The device's normal brightness control has no effect at all on the brightness of the open book and conversely the app's brightness control does not have any effect on the normal brightness of the screen for anything else other than the open book's pages themselves. If I recall correctly, it has been a while since I checked through some of the better ones, some other reading apps allow the same.
So, in the book itself whites (should one want to have a white background, remembering even a paper book is not white) can be modulated right down to near zero brightness, but when one reverts to the reading app's display of collections (for example) or to another application or the device's home screens the display reverts to whatever brightness setting one had for general use of the device.
I won't be pedantic about your incorrect relation of the word "diffuse" to the amount of light transmitted, I will put it down to you too being economical with words
.