Force touch module, preparation method thereof, touch screen panel and display device

Abstract

The invention discloses a force touch module, a preparation method thereof, a touch control panel and a display device, and belongs to the related technical field of touch control display. The force touch module comprises a first substrate, a second substrate and a first sensing electrode of a pressure sensor; an insulating layer is arranged between the first substrate and the second substrate; the first sensing electrode is arranged between the insulating layer and the first substrate; a via hole is formed in the second substrate and is located at the position corresponding to the first sensing electrode; a force sensing signal line is arranged at the second substrate and one end of the force sensing signal line penetrates the via hole to be connected with the first sensing electrode; theother end of the force sensing signal line is connected with a corresponding flexible circuit of the device. A second sensing electrode of the pressure sensor is a device middle frame. According to the force touch module, the preparation method thereof, the touch screen panel and the display device, the thickness of the display screen cannot be added excessively while a touch control function isadded, the technology and the structure can be simplified, and the yield is increased.

Description

Technical field [0001] The present invention relates to the technical field related to pressure-sensitive touch display, in particular to a pressure-sensitive touch module, a preparation method, a touch screen and a display device. Background technique [0002] With the rapid development of display technology, touch screen panels have gradually spread to all aspects of people's lives. At present, touch screens can be divided into resistive, capacitive, infrared, surface acoustic wave, electromagnetic, vibration-wave induction, and frustrated total internal reflection optical induction types according to their working principles. Among them, the capacitive touch screen is sought after by the industry as the new favorite due to its unique touch control principle, with the advantages of high sensitivity, long life, and high light transmittance. The electromagnetic touchpad is widely used in many high-level computer-aided drawing systems, such as AutoCAD, because it can realize the ...

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Problems solved by technology

[0003] At present, to realize the pressure-sensitive touch function, it is necessary to add a layer of film material on the back of the display module or other positions as a pressure-sensing layer, which not only requires the pressure-sensing layer to be controlled by an independent chip or circuit, but also leads to the failure of the display device. The structure is more complex, and the thickness and cost will increase

Moreover, since the pressure-sensitive signal line in the added pressure-sensitive layer needs to be connected to the flexible circuit of the display screen, an additional bonding (bonding) process is required, which increases the process and reduces the yield rate; There is some interference in the three positions of the flexible circuit, the flexible circuit of 2D touch and the flexible circuit of 3D touch, which will further increase the difficulty of the bonding process

In addition, this type of pressure-sensing layer is usually only capable of single-point pressure sensing, making the final pressure-sensing effect poor

[0004] Therefore, in the process of implementing the present application, the inventors found that the prior art has at least the following problems: the current method of adding pressure-sensitive touch function to the display screen will not only increase the thickness and cost of the display screen, but also make the structure and process of the display device It is more complicated and reduces the yield rate of corresponding products

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