Apple tech can illuminate 'invisible' touch controls, displays

in General Discussion edited January 2014
Apple on Tuesday was granted a patent for an invention that creates microperforations in a device so small as be imperceptible to the naked eye, but large enough to allow the passage of light, that can be used in concert with multitouch technology to create invisible device controls.

Microperforation Patent
Microperforations as used on a MacBook with Apple logo. | Source: USPTO

Apple's U.S. Patent No. 8,303,151 for "Microperforation illumination" can be viewed as an augmentation to the technology used to create the white sleep indicator light found in the MacBook computer lineup. Unlike the existing implementation, however, the new patent allows for greater control and intensity of the light emitted, while providing for embodiments where touch sensitive materials can be used to create "invisible" controls.

The invention describes a number of backlit visual display embodiments, all of which are based on a light source, a light guide, and some implementation of microperforations in the body of a device. Aimed directly at making a device more aesthetically pleasing, the technology can be used for status indicators, functional input elements like a keyboard or mouse, or solely for design such as a logo.

Microperforations Logo
Close-up illustration of microperforation layout in Apple logo.

From the patent's background:
While providing attractive visual display elements and indicators for a user is very important in many electronic devices, much of the aesthetic appeal of a device can quickly be compromised if the visual display elements do not transmit enough light to be adequately perceived by a user. The aesthetic appeal of a device may also be diminished if inactive visual display elements remain perceptible to the user when in an "off" state.
Key to the invention's advancement over current designs is the way in which light is finely tuned as it passes through the microperforations. To create the tiny holes, a laser is used to make precise cuts in a material's face. Because the shape of the cuts can be manipulated, in some cases conical or cylindrical, the intensity and focus of the light emitted can be controlled.

Offering further control over the way light is passed through the microperforations are concave microlenses, which themselves can be formed in various shapes to achieve a desired level of light refraction. For example, a steep-walled microlens may yield a more intense, focused light while a different wall gradient may produce increased refraction and thus a more diffuse light.

Microperforation Arrangement
Varying taper and diameter of microperforations to direct light output (top).Illustration of variable side bore size in proportion to distance away from light source (bottom).

Feeding light to the perforations is a light guide, much like those used in current iOS devices for LED backlighting. The microlenses are positioned along the light guide, beneath the microperforations, or in the perforations themselves to illuminate the visual display, thus increasing efficiency and control over the light's direction. Depending on the implementation, the bottom of the light guide can also have microlenses.

In order to achieve uniform illumination, the microperforations can be enlarged with respect to their distance from the light guide. For example, holes closer to the light source have a smaller diameter while those farther away have a large bore.

The '151 patent also provides for touch sensitive materials to be placed within the device's structure to create an interactive lighting system that can appear and disappear when as needed. Such controls could be useful in keeping a device's surface completely blank when powered off, which would transform into an adequately bright user interface when powered on. Similar technology exists in other portable devices, however the cutouts used to shape emitted light can still be seen even when turned off.

It is unclear if Apple will one day incorporate the invention into a consumer product, however with the current implementation of the MacBook's sleep indicator, such a system may feasibly be deployed without major retooling.


  • Reply 1 of 14
    irelandireland Posts: 17,547member


  • Reply 2 of 14
    jragostajragosta Posts: 10,473member
    That's kind of neat.
  • Reply 3 of 14
    That would be cool.
  • Reply 4 of 14

    So cool. What other hardware designer ever considers this? 

  • Reply 5 of 14
    jupiteronejupiterone Posts: 1,564member
    carthusia wrote: »
    So cool. What other hardware designer ever considers this? 

    All I'm's just a natural progression of display tech.
  • Reply 6 of 14
    solipsismxsolipsismx Posts: 19,566member
    I am having trouble thinking of practical applications for this.
  • Reply 7 of 14


    Originally Posted by SolipsismX View Post

    I am having trouble thinking of practical applications for this.

    It's just to make the device more ... cool image.

    And I don't talk about the temperature here.


  • Reply 8 of 14

    I wish Apple would just litigate and quit this innovation thing

  • Reply 9 of 14

    Great hand to Apple, and with a  "programmable" mask and color, this is just the beginning.

  • Reply 10 of 14

    Originally Posted by GadgetCanada View Post

    I wish Apple would just litigate and quit this innovation thing


    I like this take. image

  • Reply 11 of 14
    evilutionevilution Posts: 1,347member

    Nice idea but a real world no no for a touch area. This is similar to the power/bluetooth light on the magic trackpad although the holes are just about visible.

    Consider: small holes + dead skin cells = no holes.

  • Reply 12 of 14
    MarvinMarvin Posts: 14,208moderator
    The keyboard in the diagram is a bit odd as it shows a full size keyboard on a laptop but it shows the possibility of having a numpad. I made a mockup of what a keyboard using illuminated perforations might look on the Air like a while back:

    [IMG ALT=""][/IMG]

    The idea was using something like e-ink to block LED light in patterns without refreshing the pattern.

    I think it has to be combined with sensors above the surface to detect incoming touch as well as capacitive touch. I wonder how good they can make capacitive touch without having a glass coating too. It might be a bit fragile covering the entire surface with glass.

    It offers a lot of possibilities though like having contextual input. FCPX can have a full edit layout with icons. It might not be worth doing for input though because sooner or later, you just want to end up touching the screen directly anyway.

    The first place I'd like to see it is with the logo. Especially if the entire back was perforated so you could have your own patterns. They can make sure you couldn't affect the Apple logo.
  • Reply 13 of 14
    I imagine a tablet that's just a slate of aluminum, front and back. When you turn it on, the screen appears through the metal. You heard it here first, folks.
  • Reply 14 of 14
    sockrolidsockrolid Posts: 2,788member
    The camera indicator light next to the iSight camera in MacBooks also uses microperferation technology.
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