10-18-2019, 03:37 AM | #1 | |
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Reflective displays vs Emissive displays
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And it's not proven LCD screens damage eyesight. Enviado desde mi Redmi 3S mediante Tapatalk |
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10-18-2019, 06:08 AM | #2 |
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10-18-2019, 10:22 AM | #3 | |
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Light is light: what's the difference between light reflected or emitted? |
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10-18-2019, 11:59 AM | #4 | ||
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Of course if you happen to squint at your LCD you can dim the lights and get a better effect, if you happen to be indoors (which you are not to assume) - only, (1) those who are outdoors cannot easily access dimmers, and (2) nonetheless, easily the darkness in which an indoor study has to be put to bring focus on a backlit monitor to optimality can be unreasonable in daytime. Quote:
It is not simply «light reflected or emitted», as if we were talking of a torch beaming in your eyes directly or through a mirror: it is a matter of the whole system. Also, again as per the above, ask your eyes what the difference is, they know. |
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10-18-2019, 02:34 PM | #5 |
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Can you link experiments that prove your assertions? I don't confide in my experience or feelings.
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10-18-2019, 03:28 PM | #6 | |
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Edit: for the distracted, Viceant is asking "What if I could not trust... my sensory feedbacks". Which is also asking, a là Descartes, "What if my senses trick me". It reminded me though possibly marginal one note from Sapolsky, "How does your limbic system know you are relaxed or tense? It checks if your muscles are". Well, just for the intellectual tease, one answer would be: "Proceed by absurd: what if you did not trust them feedbacks". And lose all your perception of comfort etc. .... On the weak grounds of distrust. Check the consequences. Last edited by mdp; 10-18-2019 at 03:42 PM. |
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10-19-2019, 10:50 AM | #7 | |
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I won't discuss these issues here. Enviado desde mi Redmi 3S mediante Tapatalk Last edited by viceant; 10-19-2019 at 10:54 AM. |
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10-19-2019, 01:20 PM | #8 | |
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So far, so good? Now it gets more complicated. An backlit LCD panel is neither diffuse nor reflected. But it is still polarized through a set of polarization filters. The backlight itself is diffuse, similar to how a photographic softbox looks like. That diffuse light gets filtered to be polarized, this time around not through reflection, but by eliminating the majority of the light that swings in an undesired direction. Then it hits the liquid crystal layer that will turn the light depending on how much voltage is applied. Then it hits another pol filter that will let white light through the best and black the worst, depending on how far you twist the light. Then it hits a color filter in the case of a color LCD. No matter how you eluminate eink, the resulting light is always diffuse. More natural light, just like a traditional paper book looks. Last edited by DuckieTigger; 10-19-2019 at 01:23 PM. |
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10-19-2019, 02:02 PM | #9 |
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Ok, thanks for the lesson. But, as you say, we don't know yet whether LCD light causes poor eyesight or another health issue. I do prefer e-ink, but it's only my preference.
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10-21-2019, 03:57 AM | #10 | |
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Now eink can have a frontlight. Older ones are "white LEDs" like LCD, however you can turn it off. The "night" colour of LCDs is done by varying the LCD, not the "White LED" backlight. White LEDs are a composite device, they are really Blue/Violet/UV (depending on cost) with a yellow phosphor. With age there is less yellow. Hence cheaper LCD backlights can look a little purple and all go more violet/purple with age. Conversely my 2000 and 2002 Laptops (which I still have) use CCFL which are a kind of mercury vapour discharge tube giving off mostly UV. They use a much thicker phosphor than LEDs and also a mix of phosphors to better simulate a full spectrum. The blue phosphor (not usually present on LEDs as they are blue) wears faster as on Plasma TVs, so they develop a yellow cast. Our older HDTV is also CCFL, the newer one is LED backlit. Cheaper TVs use LEDs only at the edge. Newer "comfort" front lights don't use the nasty "white" LEDs, or at least not solely, the colour is achieved by different colours of LED. Some might use RGB LEDs which are Red, Green and Blue chips in one package. A Spectrometer or a prism would tell as RGB LED have 3 spikes. A White LED has a diffuse band from reddish-orange to yellow-green, peaking in yellow and a blue peak. Most have no cyan. The new filament style LED room lamps are interesting. Each stick is about 20 to 26 LEDs. The power is low per LED so more efficient and phosphor coating works better and ages slower. The entire stick is coated with the yellow phosphor to convert enough blue/violet/UV light. Also the better colour ones have some other colours of LED on the stick (red and cyan) to improve colour rendition. Reading an eink illuminated by these is much better than LCD or OLED screens because there is almost no UV and less blue than regular "White" LEDs. The spectrum is closer to a halogen than traditional LED lamp or even a Fluorescent lamp (tube or CFL or CCFL). Another benefit of the LED stick filaments is that each stick is about 55V. Thus 2 sticks about 110V and 4 sticks 220V. No SMPSU is needed, which generates heat, has lower life than LEDs and usually creates radio interference. So some stick filament LED lamps will also work on dimmers. So if you have a suitable ambient light / bedside lamp, it's a fact that eink is better for the retina and your sleep patterns than LCD and most OLED phones/tablets. Nothing to do with placebo. It's also true that all LCDs have only one polarisation of light, OLED and LCD have narrower view angle and light emission than eink. The eink is a milky coloured liquid. Each cell has a number of black balls. It's got a massive viewing angle, totally diffuse like paper and no polarisation. However there is no evidence I've read that having only one polarisation of light does any harm. Last edited by Quoth; 10-21-2019 at 04:03 AM. Reason: PSU |
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10-21-2019, 06:41 AM | #11 | ||
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Damage to the retina from reading on a tablet/phone has the status of FUD, not science. |
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10-21-2019, 09:30 AM | #12 |
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And the sleep studies are suspect with small number of people studied.
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10-21-2019, 10:04 AM | #13 |
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Unless you are selling LCD tablets or LEDs, I'd err on the side of caution. People that don't read much or have never used eink think it's madly expensive for a single use device. Mostly people that read lots on eink only use phones for convenience or tablets for larger than A5 PDFs. It's not placebo.
There are very rich vested interests such as Google, Samsung and Apple selling phones that cost x5 what I'd pay. |
10-21-2019, 11:16 AM | #14 |
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FUD FUD FUD --- FUD Alert.
FYI - reading is bad for your eyes. |
10-21-2019, 11:41 AM | #15 | |||
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Quote:
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There is a difference between "I prefer reading on eInk" and "LCD displays damage your retinas". There is a difference between "I find that reading on LCD displays make me sleep worse" and "LCD display damage your retinas". Quote:
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