bút nhẹ
/ˈlaɪt pen//ˈlaɪt pen/The term "light pen" originally emerged in the late 1960s to describe a special type of input device that could be used in conjunction with a cathode ray tube (CRT) display, such as a television or computer monitor. The device consisted of a handheld pen with a photodetector, which was sensitive to light. When pressed against the CRT screen, the photodetector detected the light emitted by the phosphorescent coating on the screen's surface and generated an electrical signal. This signal was then converted into a coordinate and communicated to the computer, allowing the user to select and manipulate on-screen entities or make other types of input. Thus, the "light pen" enabled greater precision and interactivity in computer graphics and user interface design, paving the way for the development of modern graphic tablets and touch screens.
a piece of equipment, like a pen in shape, that is sensitive to light and that can be used to pass information to a computer when it touches the screen
một thiết bị, giống như một chiếc bút, nhạy cảm với ánh sáng và có thể được sử dụng để truyền thông tin đến máy tính khi nó chạm vào màn hình
a similar piece of equipment that is used for reading barcodes
một thiết bị tương tự được sử dụng để đọc mã vạch
