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Early LCDs had terrible ghosting (anyone remember trying to play Doom on an early mono LCD and the image instantly turning into incomprehensible hash?), but I can"t find any references for actual numbers for the pixel flip time. I"d be interested to know how they compare to eink. Does anyone know?

For some reason the shiny, curved black plastic reminds me of a weird cross between Darth Vader and something a character in a Terry Gilliam film would use. Stick a Fresnel lens over the screen and you"re all set.

Even in non-power-constrained environments e-paper can be preferable - the glow of a typical LCD display is really distracting and doesn"t fit in a lot of (most) environments. Have enough gadgets around with LED displays and indicators and your home suddenly seems like a really bad 80s movie.

A thermostat with an always-on screen is the same, they"re already displaying information and the touch screen can be immediately used without delay - but we don"t want the display to be always on, because in general LCDs look awful in their environments. In general people prefer their homes to not look like server rooms with blinking lights and garish panels everywhere.

So there is a non-technological need to keep the screen off, and this presents a fundamental problem - before anything can be done, the screen must first be woken up. No matter how fast you make this process, at the end of the day is one extra step that the user must do before the device can be used.

The only real solution is for your devices to be always-on in a much more fundamental way - like your VCR or microwave - and that in some cases means e-ink screens.

EDIT2: I measured it frame-by-frame, it takes 5 frames from the moment the button starts to move until the screen is completely functional, showing the proper image. The video is at 25 fps, so that"s 200ms, for the whole device to go from non-powered to fully working animation.

With a device like your microwave (or your arcade game) steps 1 and 2 don"t exist, because the inputs are visible even when the screen is off. With your microwave you just walk up and start punching your desired buttons right away, the screen will catch up to you quickly.

Sure, yes, one reason we keep displays off most of the time is because of their usage, but more and more so it"s the secondary reason - there are lots of power efficient displays nowadays that can maintain an always-on screen at relatively low power cost, and smarthome devices generally aren"t reliant on battery power.

But the bigger problem is that LCD displays are ugly. They are backlit, and their response to better lighting in the room is to increase its own strength to make itself even more apparent. They are ugly, obnoxious, and annoying in the same way blinking router lights are, but multiplied several times over.

So we keep them off - we can afford to keep them on, but the fact that we keep them off 99% of the time less environmental consciousness but more an acknowledgment that they"re visually noisy, distracting, and just kind of don"t fit in. When you walk into a room you don"t want your attention immediately drawn to this LCD panel on the wall with its pale glow.

I think those are much more common in new installations. These are segmented LCD displays. An eInk display would not require an explicit segmentation layout, so new layouts could be programmed on the fly, prototyped very quickly, etc. And might even be a little easier to read, even during daylight hours I find these types of LCD displays difficult to read, especially from off-angles.

I"m more inclined to do the 6 rows of 7 displays which allow for a day aligned calendar for every month. It wastes a few displays of course, but the displays are easier to get.

I spent this weekend creating a small micro-controller system (freescale uC) with an attached tft lcd+touch, the latter cost me less than a 1/4 of this display and uses standard connections and readily available datasheets.

I"ve been working with these types of LCDs for a long time, and when it comes to these WVGA/SVGA 7" units you can get a ton from Asia at great prices but the factory will literally disappear in a few months. The LCD fabs constantly get bought/sold/churned as the major players like Sharp and LG shed off their last-generation fabs and the other smaller fish scoop them up.

Ideally a group like RPi will want to have the same part available for a long time so that they don"t need to create new revisions of the interface cables, power supplies, or software drivers to handle the change. It"s nearly impossible to autodetect one 7" LCD from another via software so you need to configure it entirely in a bootloader or kernel configuration line. And then that becomes a massive support issue.

My example is that you can rig the Pi to work with your own Receiver as a wifi flac player with this device: https://www.hifiberry.com/. You have to control it over wi-fi, but having a console that I can go up to and interact with will be awesome. Also will be great for people like my Father-in-law, I wanted to build him a device that has all 60s/70s/80s rock for christmas, but I didn"t want to have to set-up a wifi router and get a device for him just to control it.

So the PCB part does this "adapter" work to make the screen "talk" with the R-Pi, right? Screens for mobile devices, don"t they have any standards someone can use to build a similar PCB?

Still cheaper to source these parts yourself, you are right, but the official screen isn"t meant to be the cheapest, it"s meant to be cheap enough to be affordable, to workout-of-the-box, to be reliable, of good quality and have some guaranteed availability.

You can work with other screens and build and write your own interface if that"s part of the pleasure you get from hacking on these devices, but for people who have other goals, being able to get an affordable screen that just works allows them to spend their time on other parts of their project.

This is $60 plus taxes and shipping. I just found a 7-inch tablet for £28 ($43.10) on Amazon (plus a camera and RAM and stuff). Including taxes and shipping. Why is this so expensive?

Sales volumes determine economies of scale, it is likely the £28 tablet was made in quantities much larger than the pi screen (I"d guess at least 2 orders of magnitude).

Also, not all screens are equal. It"s not just resolution: there"s colour reproduction, viewing angles, brightness, contrast and response time. On the non-technical side mentioned on the blog, they mentioned they wanted a manufacture who would make the panel for a long time. I would bet a dollar that Pi screen beats the £28-tablet display on all the above parameters

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