In this type of keyboard, pressing a key changes the capacitance of a pattern of capacitor pads. The pattern consists of two D-shaped capacitor pads for each switch, printed on a printed circuit board (PCB) and covered by a thin, insulating film of soldermask which acts as a dielectric.

Despite the sophistication of the concept, the mechanism of capacitive switching is physically simple. The movable part ends with a flat foam element about the size of an aspirin tablet, finished with aluminum foil. Opposite the switch is a PCB with the capacitor pads. When the key is pressed, the foil tightly clings to the surface of the PCB, forming a daisy chain of two capacitors between contact pads and itself separated with thin soldermask, and thus "shorting" the contact pads with an easily detectable drop of capacitive reactance between them. Usually this permits a pulse or pulse train to be sensed. Because the switch doesn't have an actual electrical contact, there is no debouncing necessary. The keys do not need to be fully pressed to be actuated, which enables some people to type faster.
The IBM Model F keyboard is mechanical-key design consisted of a buckling spring over a capacitive PCB, similarly to the later Model M keyboard that used a membrane in place of the PCB.
The most known company for their capacitive (electrostatic) switching technology is Topre Corporation from Japan. Unfortunately though, their products are not available in large parts of the world.

Market Analysis and Insights: Global Capacitive Keyboards Market
In 2020, the global Capacitive Keyboards market size was US$ XX million and it is expected to reach US$ XX million by the end of 2027, with a CAGR of XX% between 2021 and 2027
Global Capacitive Keyboards Scope and Market Size
The global Capacitive Keyboards market is segmented by region (country), company, by Type, and by Application. Players, stakeholders, and other participants in the global Capacitive Keyboards market will be able to gain the upper hand as they use the report as a powerful resource. The segmental analysis focuses on sales, revenue and forecast by region (country), byType, and by Application for the period 2016-2027.

Segment by Type
With RGB
non-RGB

Segment by Application
Personal
Business

By Company
PFU Limited
Topre Corporation
Nizkeyboard
BTC
Leopold
NIZ keyboard
Rosewill
Fuhlen

By Region
North America
United States
Canada
Europe
Germany
France
U.K.
Italy
Russia
Asia-Pacific
China
Japan
South Korea
Southeast Asia
India
Australia
Taiwan
Indonesia
Thailand
Malaysia
Latin America
Mexico
Brazil
Colombia
Argentina
Middle East & Africa
Turkey
Saudi Arabia
UAE