Future MacBook keyboard could have customizable aluminum keys
Apple is working on how to make a perforated aluminum keyboard chassis with keycaps that incorporate an array of LEDs that can change what is displayed on each key.

New Apple Keyboard could be made from aluminum
Apple files all sorts of patents in order to cover its intellectual property and research from potential copycats -- even if the technology is never used. Some patents tend to be incredibly vague or difficult to determine until the product is introduced in reality.
That mostly describes the latest such filing, a newly-granted patent that describes a futuristic MacBook keyboard that can change what is displayed on the keys. However, unlike previous touchscreen keyboard concepts, this would use physical keys and LEDs to perform the trick.
The keyboard would still look like a standard hardware keyboard at a glance. The key casings would be aluminum instead of plastic, and when the MacBook is off, there wouldn't be any visible markings on the keys.
Pressing a key would still actuate a scissor-switch mechanism, so typing would feel similar to existing plastic keyboards used in MacBooks today. However, the keyboard would be made from the same material as the rest of the laptop, enabling a more uniform design, colorway, and rigidity. Note that Apple used aluminum key caps on the PowerBook G4, but those had regular key markings.
When the MacBook is turned on, the keys would illuminate. A standard QWERTY keyboard would be displayed, and unlike today's plastic keys, light would only be visible from the glyph on the key cap. The aluminum key enclosure would have no light bleeding on the key edges.

LED backlighting would control what was displayed on each key
If the user needs to switch to, say, the French AZERTY layout, the keyboard could change to show them exactly that. Or if they simply need a quick way to type symbols, emoji, or punctuation, the keyboard would again be able to change what is displayed on the key cap.
Think of it as a physical keyboard functioning like an iPhone's software keyboard -- changing what is shown given the context.
This would be accomplished by using a mini-LED, or similar, backlight below the aluminum key plate. Each key would have perforations cut precisely so each LED would shine directly through the top of the key cap.
Each key would effectively act as a low-resolution display, showing whatever letter or glyph was needed.
This technology is different from using miniature displays for each key like a Stream Deck. Nor is the technology, as proposed, able to produce high-resolution imagery like an OLED display or similar.
This patent is more closely related to an 8-bit display than a fully-functional display.
Read on AppleInsider
Comments
as often asked about the infamous touch bar that never made it to the desktop...?
That said is a basic backlit keyboard option long overdue...? : )
Either way, this will be a great reason for me to upgrade. I use different languages on my keyboard and something like this will be very welcomed. Also I think this maybe a good replacement for the TouchBar, maybe we can invoke emoji icons and they'll show on the spacebar. Swipe to scroll and tap to select. Looking forward to this
The latter. They used very fine perforations for the sleep light on several models.
now is this for a keyboard like the example or something else.
Don’t get me wrong: I like e-ink products. If this possible-future Apple keyboard was e-ink, but would be great (for an e-ink product fan like me). I’m only commenting specifically about retaining the image even with the power off.
Perforated key caps could be a problem with debris buildup but I'd expect Apple would take that into consideration. I have a flashlight that has an aluminum bezel with "microperforation". 1200 laser micro-pierced holes are said to allow the LED brightness and battery level indicators to be seen through the metal without compromising the IPX8 waterproof rating. I'd think that would limit if not prevent the incursion of debris and dimming the keycaps' illumination. An all black/blank keyboard displaying symbology only when turned on would be a cool Apple move. If it ever came to market.