Force detection apparatus and method, touch device and electronic terminal

Abstract

Embodiments of the present disclosure provide a force detection apparatus and method, a touch device and an electronic terminal. The apparatus includes: a first detection capacitor, and a second detection capacitor configured to perform differential processing for a capacitance of the first detection capacitor to cancel an interference signal; wherein the first detection capacitor includes a forcedetection electrode, and the second detection capacitor includes a reference detection electrode, the force detection electrode and the reference detection electrode being arranged within a surface,such that the first detection capacitor and the second detection capacitor are simultaneously coupled to the interference signal causing interference to force detection, and differential processing isperformed for capacitances of the first detection capacitor and the second detection capacitor. In this way, the interference signal, for example, which caused by a display device, is canceled, and sensitivity of force detection is enhanced while temperature drift is inhibited.

Description

technical field [0001] The embodiments of the present invention relate to the field of touch technology, and in particular, to a pressure detection device, method, touch device and electronic terminal. Background technique [0002] If the touch technology is applied to a smart terminal, the user can realize the operation of the terminal as long as the gesture is operated, getting rid of the traditional mechanical keyboard and making the human-computer interaction more straightforward. [0003] However, with the development of touch technology, such as capacitive touch as an example, simple finger touch can no longer meet the needs of users for more dimensional input. Adding force touch technology (Force Touch) to the capacitive touch screen can add an input dimension , so that the touch screen can sense finger pressure information, sense the strength of light pressure and heavy pressure, and call out different corresponding functions, so as to provide a better user experienc...

AI Technical Summary

Problems solved by technology

[0006] However, there is another load-to-ground capacitance, which is formed between the pressure detection electrode and the middle frame. This load-to-ground capacitance will have a negative impact on the detection of the effective ground-to-ground capacitance. to interfere

In addition, the presence of display devices interferes with the effective capacitance to ground

Therefore, these disturbances can negatively affect the sensitivity of effective ground capacitance detection, further reducing the sensitivity of pressure detection

[0007] In order to solve the interference caused by the display device, a layer of shielding layer is added in the prior art. The shielding layer is arranged between the display device and the pressure detection electrode, but adding a layer of shielding layer will lead to an increase in cost and make the display Overall thickening of the screen

The existing technology does not provide a relevant solution to the interference caused by the capacitance of the load to the ground

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