What is the principle of the notebook trackpad?

[Touchpad] The principle of notebook touchpad is what notebook touch screen use precautions

What is the principle of the notebook trackpad?

The touchpad (touchpad) is currently the most widely used notebook mouse. Except for IBM and Toshiba laptops, most of them use touchpad mice, especially Taiwanese and mainland brands, almost all use touchpads. . The use is very simple, the finger touches the touchpad below the keyboard, the cursor will move with it; for the third generation touchpad, the function has been extended to the tablet, which can be directly used for handwritten Chinese input. The advantage of the touchpad is its responsiveness and fast movement. The disadvantage is that the reaction is too sensitive, resulting in low positioning accuracy; when using the computer for a long time, when the hand points out the sweat, the mouse is not very agile, and often slips. It is less adaptable to the environment and is not suitable for working in wet and ashy environments.

The English name of the touchpad is called Touchpad. This device is an input device that can move the cursor by sliding the finger on a smooth touchpad. It is easy for beginners to use. Because the thickness of the touchpad is very thin. So it can be designed in a slim notebook computer or keyboard. And not a mechanical design. It is very easy to maintain. Its working principle is that when the user's finger approaches the touchpad, the capacitance will change, and the touch panel's own control IC will detect the amount of capacitance change and convert it into coordinates. The touchpad uses capacitive sensing to know the movement of the finger and is not sensitive to the heat of the finger. When the finger touches the board surface, the electrostatic field on the board surface changes. The touchpad sensor is simply a finger track conduction line printed on the surface of the board.

The internal structure of the touch mouse is as shown above, and the printed circuit board is used to form an array of rows and columns; the printed board and the surface plastic film are bonded with strong double sides, and the sensing detection principle is capacitive sensing. A special integrated circuit board under the surface of the touchpad continuously measures and reports the trajectory to detect the movement and position of the finger. Generally, the touchpad is a PS/2 interface. It can be used without installing a driver under Windows 98 system. Finger tapping, jog, and double-point loading are free. In DOS, you only need to install the mouse driver like normal amuse.com. In contrast, some USB mice nowadays do not have a driver under DOS, so some hardware development programs working under DOS cannot be applied.

Notebook touch screen use precautions

1. To move the cursor, move your finger gently on the smooth sensing area;

2, to select the object, please tap once on the surface of the touchpad;

3. To select and move (or drag) the object, position the cursor on the object and tap the touchpad twice in succession. When tapping the touchpad a second time, place your finger on the touchpad and slide on the surface to move the selected object;

4. To double-click an object, position the cursor on the object and tap twice.

The advantage of the touchpad is that it can be customized to the size of the area, the size can be determined according to the manufacturer's order, and its use is wide, all built-in, ultra-thin notebooks can be applied; and the power consumption is small, the average in sleep mode Only 600 μA (PS2 mode) is eliminated; and handwriting input function (option) is available; it is durable and reliable because it is a mobile-free component; its low cost becomes a high value-added directivity. Solution; it has a lightweight and smooth pointing device and provides full-featured driver software.

Because the touchpad is a pressure-sensitive device, the touchpad can be easily damaged if not properly protected. Be sure to pay attention to the following points when using:

1. Do not let the touchpad be contaminated with dust, liquid or grease;

2. Wash your hands before using the touchpad. If the fingers are not clean, do not touch the touchpad.

3. Do not press heavy objects on the touchpad or other buttons;

4. Make sure that your hands are not too sweaty or humid, as excessive humidity can cause the indicator device to be shorted. Please keep the surface of the touchpad clean and dry;

5. When you are typing or using the touchpad, do not rest your hand or wrist against the touchpad. Since the touchpad can sense any movement of the fingertips, if you put your hand on the touchpad, it will cause the touchpad to react poorly or slow down;

6. It can be operated with only one finger. Simultaneous operation of multiple fingers will cause the touchpad to generate confusing information.