ALLPCB
Introduction
Touch technology is widely used in public and consumer devices. Automated teller machines often feature touch screens, and many hospitals and libraries have public computers with touch capability. Mobile phones that support touch input, MP3 players, and digital cameras are also common.
Single-Point vs Multi-Touch
Many existing touch screens support only single-point input: they can detect one finger touch or click at a time. When two or more points are touched simultaneously, single-point systems cannot respond correctly. Multi-touch technology separates the task into two parts: simultaneous acquisition of multiple input signals and interpretation of each signal in context, commonly referred to as gesture recognition. This enables recognition of interactions involving multiple fingers at once.
Definition
Multi-touch (also called multitouch or multi-touch) is implemented through a combination of human-computer interaction techniques and hardware. It enables interaction without traditional input devices such as a mouse or keyboard. A multi-touch system can be a touch screen, touch surface, tabletop, or wall, and can accept input from multiple contact points simultaneously for human-computer interaction.
Common Multi-Touch Technologies
LLP technology uses infrared laser equipment to project infrared light across the screen. When the screen is obstructed, reflected infrared light is captured by cameras beneath the display. The system analyzes the reflections to determine touch points.
FTIR technology adds an LED light layer within the screen sandwich. When a user presses the screen, the light layer produces distinctive reflections. Sensors detect changes in light and determine the point of pressure.
ToughtLight technology projects infrared onto the screen. When the screen is obstructed, reflected infrared is captured by a camera beneath the display and processed by the system to determine touch locations.
Optical Touch technology places lenses at the top edges of the screen to detect changes in gestures and touch positions. The system converts those signals into coordinates for processing.
Features
- Multi-touch supports multiple points or multiple users interacting on the same display, replacing single-point input modes based on keyboard and mouse.
- Users can use both hands and perform various gestures such as single tap, double tap, pan, press, scroll, and rotate. These gestures enable intuitive manipulation of content and richer exploration of data, including text, video, images, satellite imagery, and 3D or analog information.
- Touch panels, touch software, and multimedia systems can be customized to meet specific requirements and can integrate with professional graphics software.
