What is the principle of the touch button on the Lenovo Y450?

It's capacitively inductive. Human beings are actually electrically conductive, and when the human body approaches the sensing area, human beings are equivalent to the poles of capacitance. "When we touch the sensor screen with our fingers, the electric field of the human body causes the fingers to form a coupling capacitor with the surface of the touch screen, which is a direct conductor for high-frequency currents, so the fingers suck a small current from the contact point.

This current is drawn from the electrodes of the touch point, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners, and the controller derives the position of the touch point by accurately calculating the proportion of these four currents. Since the capacitor has the characteristics of "resisting low frequencies and passing high frequencies", there is a current flowing through the electrodes at the touch point, so there is a reaction.

Electrostatic induction, the human body has a weak bioelectricity. Not by pressure.

1.Updates and changes in the computer system or software may be the reason why the Lenovo touch key cannot be used normally, and the drivers and features in the Lenovo system are all launched as a package. Your system is Win7 from the factory, that is, the features are also prepared for Win7 system, and the XP system is prepared for XP system, and the driver installation disk that is distributed randomly is only prepared for one system.

So if you originally shipped the Win7 system and now the chip XP system, the touch key cannot be used. In other words, you still use win7 system but install a newer hardware driver or reinstall the driver, resulting in incompatibility with the touch key driver, so that it cannot be used normally!

2.You can use Lenovo one-click recovery software in win7 system to do incremental updates for the current system status, or contact Lenovo Sunshine Service Center to redo the system factory backup for the existing system status.

No. It really doesn't work, reinstall the system with the mounting disk, and toss a few more times to heihei

The Lenovo Y450 function key usage is as follows:

FN+ESC : Turn the camera on and off.

Fn + F1: Put the computer into sleep mode.

FN + F2: Turn the LCD screen on and off.

Fn + F3: Switch to a different connected display device.

FN + F4: Opens the display resolution setting interface.

Fn + F5: Turn on the built-in wireless device setup screen (enable Disable).

Fn + F6: Enable Disable Trackpad.

fn + f8: numlk function.

fn + f9: pause function.

fn + f10: break function.

fn + f11: scrlk function.

fn + f12: insert function.

fn + lower increase screen brightness fn + lower increase system volume keyboard diagram:

FN+ESC : Turn the camera on and off.

Fn + F1: Put the computer into sleep mode.

FN + F2: Turn the LCD screen on and off.

Fn + F3: Switch to a different connected display device.

FN + F4: Opens the display resolution setting interface.

Fn + F5: Turn on the built-in wireless device setup screen (enable Disable).

Fn + F6: Enable Disable Trackpad.

fn + f8: numlk function.

fn + f9: pause function.

fn + f10: break function.

fn + f11: scrlk function.

fn + f12: insert function.

fn + decrease to increase screen brightnessfn + decrease to increase system volume.