問56
頻出度★☆☆
タッチパネルに関する記述として, 適切なものはどれか。
平成25年度 春期 ITパスポート試験 問56
This question's explanation and your answers so far.
解説
問 56
Incorrectア
This describes a tablet (pen tablet) or a digitizer. It is operated by combining a pen-shaped or mouse-shaped pointing device with a flat board that detects the position of that device. What you touch in order to indicate a position is not the screen but a flat board that is separate from the screen, so it is a device different from a touch panel, which you touch on the display surface itself.
- イ
正解 The correct answer is イ. A touch panel is an input device in which a sensor layer is laid over the surface of a display device such as an LCD; it detects the position where a finger or a pen directly touches the screen (the display surface) itself, and that position is used for operation. In other words, its greatest feature is that the display device and the input device are integrated into one, and the decisive point that separates it from other pointing devices is whether what you touch is the display surface itself or a flat pad that is separate from the display surface. Choice イ says that “the computer is operated by touching the screen directly with a finger or similar”, which matches this definition exactly. Note that the original wording of this question is “it comes in types such as the electronic type and the electrostatic type”, but in the usual classification there are, besides the pressure-sensitive type (resistive type), which detects the pressure of a press, and the electrostatic type (capacitive type), which detects the change of static electricity (capacitance) when a finger comes close, also types called the optical type and the electromagnetic induction type. Touch panels are widely used in smartphones and tablet devices, station ticket machines, ATMs, car navigation systems, and so on.
Incorrectウ
This describes a touch wheel (a wheel-shaped touch sensor). It is an input device with which you trace your finger over the surface of a disk-like part and turn it, as it were, to select items or scroll; it was used in portable music players and similar devices. Because it does not indicate a position by touching the screen directly, it is not a description of a touch panel.
Incorrectエ
This describes a touchpad (trackpad). You trace your finger over a flat sensor located, for example, in front of the keyboard of a notebook PC, and this indirectly moves the mouse pointer on the screen. The operating surface and the display surface are separate, and you do not touch the screen itself, so it is different from a touch panel.
ここがポイント
- Definition of a touch panel: it is a pointing device in which the display device and the input device are integrated, and a position is input by directly touching the display surface itself. Detection methods include the pressure-sensitive type (resistive type), the electrostatic type (capacitive type), the optical type, and the electromagnetic induction type.
- Distinguishing similar pointing devices: a tablet/digitizer (a pen-shaped device combined with a flat board), a touchpad (tracing a finger over a flat board), and a touch wheel (turning a disk-shaped sensor) can all be distinguished from a touch panel in that their operating surface is separate from the display surface.
用語