The disclosure provides a key structure applied to an electronic device the electronic device includes an OLED screen and an under-screen unit, a through-hole is provided at a preset position of the under-screen unit, and the key structure includes: a light-shielding unit disposed on a side that is of the under-screen unit and facing back from the OLED screen, and fixedly connected to the under-screen unit, the light-shielding unit contains an accommodation space with a notch, and the notch is in communication with the through-hole; a light-emitting unit disposed in the accommodation space; an optical unit disposed in the accommodation space and located between the OLED screen and the light-emitting unit, wherein light emitted by the light-emitting unit forms a preset key pattern on the OLED screen after passing through the optical unit; and a sensing unit located on one side of the light-shielding unit.

Methods and apparatus for adaptive keyboard scanning are disclosed. A disclosed example apparatus to adaptively control operation of a keyboard includes at least one memory, instructions, and processor circuitry. The processor circuitry is to determine whether to operate the keyboard in a first mode or in a second mode different from the first mode, the first mode corresponding to a first number of keys, the second mode corresponding to a second number of keys less than the first number of keys, and set the keyboard to operate in the first mode or the second mode based on the determination.

Disclosed systems provide keyboard backlighting from organic light emitting diodes (OLEDs) placed under the keys. A keyboard stack optionally includes a light guide or reflector. A single OLED can illuminate multiple keys through a light guide. OLEDs used for backlighting may be arranged in a strip to illuminate more than one key. OLEDs can be deposited directly to the light guide or reflector, and can include a seal to promote air stability.

Methods and apparatus for adaptive keyboard scanning are disclosed. A disclosed example apparatus to adaptively control operation of a keyboard includes at least one memory, instructions, and processor circuitry. The processor circuitry is to determine whether to operate the keyboard in a first mode or in a second mode different from the first mode, the first mode corresponding to a first number of keys, the second mode corresponding to a second number of keys less than the first number of keys, and set the keyboard to operate in the first mode or the second mode based on the determination.