Quote:
Originally Posted by Quoth
Anyone needing black background and white text simply has a backlight (LCD) or front light (eink) or brightness (OLED) too high, or if eink with no built in light they have a terrible reading light unsuitable for paper books.
The LCD and OLED screens are very different.
LCD uses rear lighting that can be LED, or on old things 18 years ago, CCFL. LCD lighting can be using an array behind a diffuser (big quality TVS) or lighting at the edge of a rear light pipe. LCDs need two polarisers, one front and back and need coloured dye filters as they are monochrome. The quality of the white backlight depends on the LEDs. Only very expensive TVs use Red, Green and Blue LEDs. Older TVs, Laptops and early smartphones used CCFL tubes which can have better phosphors because the tube emits a mix of UVA and UVB. White LEDs do not exist. They are blue, violet or near UV LEDs with mostly a broad spectrum yellow phosphor. They vary hugely in colour temperature and colour rendition.
The various kinds of OLED displays are not real LEDs in the sense of backlights, indicators or ancient calculators. They are electroluminescent dots that are diode like. They usually have phosphors as they don't properly do red and green. They might have filters on the front glass too.
An amber screen filter may work better for LCD and OLED it's too blue at night. The software approach is poor.
So called Dark mode was invented because of people simply having too high a brightness setting on LCD and OLED. It's actually more tiring than white background with proper brightness and ambient light.
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Not really true.
There are 2 scenarios where Night mode makes sense:
1- Using e-ink books in normal day mode (same like reading a book) in bright outside sunlight, is very damaging to the eyes.
There is too much light hitting your eyes, and may cause temporal blindness.
For that matter, when you have a high intensity light source, it's better to use night mode.
2- In a totally dark room, with the darkest backlight setting (or built in light like most Kindle Paperwhites and Oasis devices), the device emanates much more light bleed in normal mode than in night mode.
Only in these back light devices (or kindle-like front light how they like to call this here; though in a sense it's not a popup or PRS-700 kind of front light),does night mode make sense.
Meaning, the light emanating might lit up the room behind you in normal mode, will no longer do that in dark mode.
My tests also found the text is just as readable in night or day mode in a dark room.
Not so much with a PRS-700, where the front light bleeds out in night mode, and where letters are harder to read in night mode than day mode.
Though it's really a matter of personal preference. For as long as you can read the text on a front lit (popup led) display, you can choose either one.
Most of my tests were done with very small text (below 10pt) to aggravate or stress the reading more than with bigger fonts.
So my preferences probably won't bother others as much, who use larger fonts or displays.