CN204833207U - Touch -control display device - Google Patents

Abstract

The utility model relates to a touch display device, which includes a protective cover, a capacitive touch unit and a display module located on one side of the protective cover, the capacitive touch unit is used to obtain position information of a touch object, and It includes a pressure touch unit located on the side of the display module away from the protective cover, the pressure touch unit is used to obtain the pressure information of the touch object, the pressure touch unit includes a flexible circuit board and is arranged on the flexible circuit board multiple force sensors on the The utility model integrates the force sensor on the back of the display module, and places the force sensor on the flexible circuit board to realize the combination of position and pressure double detection. The structure is simple and compact, and the human-computer interaction experience can be improved.

Description

touch display device

technical field

The utility model relates to the field of display technology, in particular to a touch display device with pressure sensing function.

Background technique

At present, more and more products such as smart terminals with touch functions, such as mobile phones, tablet computers, and televisions, are widely favored. The touch functions of these products are realized by setting the touch screen.

Most of the current touch screens use capacitive touch screens. Capacitive touch screens work by using the current induction of the human body, that is, they must be touched by objects made of conductive materials to operate. If the user wears gloves or operates with objects made of insulating materials, Then touch operation cannot be realized.

Utility model content

Based on this, the utility model aims to provide a touch screen which can realize the touch operation of the insulating material.

A touch display device, comprising a protective cover, and a capacitive touch unit located on one side of the protective cover and a display module, the capacitive touch unit is used to acquire position information of a touch object, and a capacitive touch unit located on the display module A pressure touch unit on the side away from the protective cover is used to acquire pressure information of the touch object, and the pressure touch unit includes a flexible circuit board and a plurality of force sensor.

The utility model integrates the force sensor on the back of the display module, and places the force sensor on the flexible circuit board to realize the combination of position and pressure double detection. The structure is simple and compact, and the human-computer interaction experience can be improved.

In one of the embodiments, the force sensor is a piezoelectric sensor, including a piezoelectric film and electrodes arranged on both sides of the piezoelectric film, electrode leads are arranged on the flexible circuit board, and the electrodes are connected to the electrode leads through conductive glue. bonding.

In one of the embodiments, the force sensor is a piezoelectric sensor, including a piezoelectric film, electrodes and corresponding electrode leads electrically connected to these electrodes are arranged on the flexible circuit board, and the piezoelectric film is connected to the flexible circuit board through conductive glue. The electrodes on the circuit board are bonded accordingly.

In one of the embodiments, the force sensor is a strain gauge force sensor, including a metal strain gauge or a semiconductor strain gauge, and the semiconductor strain gauge or the metal strain gauge is electrically connected to the flexible circuit board through conductive glue, and the semiconductor strain gauge or the Metallic strain gauges deform under stress and change resistance.

In one of the embodiments, the force sensor is a resistive force sensor, comprising an organic composite film doped with conductive particles and electrodes arranged on the surface of the composite film, and when pressed, the distance between the electrodes of the composite film The resistance changes.

In one of the embodiments, the flexible circuit board is in the shape of a bar, a frame or a block.

In one embodiment, the display module includes a visible area and a non-visible area located around the visible area, and the force sensor is placed in the non-visible area of the display module.

In one of the embodiments, the force sensor is located between the flexible circuit board and the display module.

In one of the embodiments, the pressure touch unit further includes a computing chip disposed on the flexible circuit board.

Description of drawings

FIG. 1 is a schematic diagram of a touch display device provided by an embodiment of the present invention.

FIG. 2 is a schematic top view of a pressure touch unit in the touch display device shown in FIG. 1 .

FIG. 3 is a schematic structural diagram of a touch display device provided by another embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a touch display device provided by another embodiment of the present invention.

FIG. 5 and FIG. 6 are structural schematic diagrams of the flexible circuit board in the pressure touch unit provided by different embodiments of the present invention.

Detailed ways

As shown in FIG. 1 , the touch display device provided by an embodiment of the present invention includes a protective cover 10 , a capacitive touch unit 20 , a display module 30 , and a pressure touch unit 40 from top to bottom.

The protective cover 110 may be a tempered glass cover, a plastic cover, a polymethyl methacrylate (PMMA) cover, or the like.

The capacitive touch unit 20 includes a plurality of driving electrodes and sensing electrodes, and these two kinds of touch electrodes can be distributed on the same substrate, or distributed on two different substrates respectively, that is, the capacitive touch unit 20 and the protective cover 10 can be Formed into structures such as GF, GFF or OGS called in the industry. The touch electrodes are led out to one place through the silver paste, and bound to the flexible printed circuit board of the capacitive touch unit 20 through the anisotropic conductive glue (ACF). The chip of the capacitive touch unit 20 can be placed on the flexible printed circuit board or On the motherboard of a touch display device (such as a mobile phone). The capacitive touch unit 20 can detect and obtain accurate position information of multiple touch objects through capacitive coupling.

The display module 30 is disposed on a side of the capacitive touch unit 20 away from the protective cover 10 . It can be understood that in some embodiments, the display module 30 can be integrated with the capacitive touch unit 20 .

The pressure touch unit 40 is disposed on a side of the display module 30 away from the protective cover 10 . The pressure touch unit 40 is used for acquiring pressure information of a touch object. The pressure touch unit 40 includes a flexible circuit board 41 and a plurality of force sensors disposed on the flexible circuit board 41 .

As shown in Figures 1 and 2, the force sensor is a piezoelectric sensor, including a piezoelectric film 42 and electrodes 421, 422 arranged on both sides of the piezoelectric film 42, and electrode leads 411, 412 are arranged on the flexible circuit board 41 , the electrodes 421 , 422 are bonded to the electrode leads 411 , 412 through the conductive glue 60 .

FIG. 3 is a schematic diagram of a touch display device provided by another embodiment of the present invention. The force sensor is a piezoelectric sensor, which includes a piezoelectric film 42 and electrodes 421 and 422 arranged on both sides of the piezoelectric film 42 . The flexible printed circuit board 41 comprises an upper base material 413, a lower base material 411 and an isolation layer 70. The lower surface of the upper base material 413 is provided with electrode leads (not shown), and passes through the electrode 421 of the piezoelectric film. The conductive glue 60 forms an electrical connection, and electrode leads exist on the upper surface of the lower substrate 411 , and form an electrical connection with the electrode 422 of the piezoelectric film through the conductive glue 60 . The function of the isolation layer 70 is to prevent the short circuit of the electrode leads on the surface of the upper substrate 43 and the lower substrate 41 . At the same time, in the non-piezoelectric film area of the flexible printed circuit board, the electrode leads of the upper substrate 413 are guided to the surface of the lower substrate 411 through through holes to facilitate electrical connection with external devices.

As shown in FIG. 4 , in another embodiment, the electrodes 421 and 422 may be directly formed on the upper substrate 413 and the lower substrate 411 of the flexible printed circuit board 41 respectively, and connected to corresponding electrode leads. The opposite two sides of the piezoelectric film 42 of the piezoelectric force sensor are respectively bonded to the electrodes 421 on the upper substrate 413 and the electrodes 422 on the lower substrate 411 through the conductive glue 60 .

When the piezoelectric sensor is under force, the upper and lower sides of the piezoelectric film 42 will generate induced charges, and the detection of the force of the touching object can be realized by detecting the induced charges.

In some embodiments, the pressure touch unit 40 further includes a computing chip (not shown) disposed on the flexible circuit board 41 . When the piezoelectric film 42 is stressed, induced charges are generated on the upper and lower surfaces of the piezoelectric film 42, and the charge signal is transmitted through the upper and lower electrodes 421, 422, and then transmitted to the computing chip through the conductive glue 60 and the corresponding lines in the flexible circuit board 41 for processing. The device can process and convert the signal, and establish the corresponding relationship between the touch pressure and the signal.

In other embodiments, the force sensor can also be of other types, for example, the force sensor is a strain sensor or a resistive force sensor. When it is a strain gauge force sensor, the force sensor may be a metal strain gauge or a semiconductor strain gauge. For example, a semiconductor strain gauge includes a semiconductor film and a resistance strip fabricated on the semiconductor film, and the resistance strip is electrically connected to a flexible circuit board through conductive glue. The semiconductor thin film may be a silicon thin film or a germanium thin film or the like. The resistor strips can be fabricated on the semiconductor thin film by semiconductor technology. The resistance strip itself, or the resistance strip and the wiring in the flexible circuit board can form a detection circuit. When the strain gauge force sensor is subjected to external force, it deforms, resulting in a change in resistance, and then the corresponding relationship with the touch pressure can be established by detecting the change in resistance or the voltage change in the detection circuit, so as to realize the detection of the force of the touch object . When the force sensor is a resistive force sensor composed of an organic composite film doped with conductive particles, there are electrodes on the surface of the composite film, which can be electrically connected to the flexible circuit board through conductive glue, evaporation, silk screen printing, etc. . When the force sensor is subjected to a pressure perpendicular to the material, the resistance value of the resistance formed between the surface electrodes of the composite film will change, so the pressure applied to the force sensor can be measured by detecting the change of resistance.

In some embodiments, the flexible printed circuit board 41 of the pressure touch unit 40 and the flexible printed circuit board in the capacitive touch unit 20 can be shared, thereby improving the integration degree of the entire touch display device and thinning the touch display device. .

The flexible circuit board 41 of the pressure touch control unit 40 may be block-shaped as shown in FIG. 2 , or bar-shaped as shown in FIG. 5 , or ring-shaped as shown in FIG. 6 . The force sensor can be provided at various locations on the flexible circuit board 41 . In some embodiments, the display module 30 includes a visible area and a non-visible area located around the visible area, and the force sensor is placed in the non-visible area of the display module 30 . The flexible circuit board may contain multiple force sensors, such as 1-8.

As shown in FIG. 1 , the force sensor is located between the flexible circuit board 41 and the display module 30 . The force sensor is fixedly bonded to the display module 30 by common glue such as optical glue 50 such as OCA.

The utility model integrates the force sensor on the back of the display module, and places the force sensor on the flexible circuit board to realize the combination of position and pressure double detection. The structure is simple and compact, and the human-computer interaction experience can be improved.

The touch display device of the utility model can be used in products such as mobile phones, tablet computers, and televisions.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1. a touch control display apparatus; comprise cover sheet; and be positioned at capacitive touch control unit and the display module of cover sheet side; described capacitive touch control unit is for obtaining the positional information of touch object; it is characterized in that; also comprise and be positioned at the pressure touch unit of display module away from the side of cover sheet, described pressure touch unit is for obtaining the pressure information of touch object, and described pressure touch unit comprises flexible PCB and is arranged on the multiple force snesor on flexible PCB.

2. touch control display apparatus according to claim 1, it is characterized in that, described force snesor is piezoelectric sensor, comprises piezoelectric membrane and the electrode being arranged on piezoelectric membrane both sides, described flexible PCB arranges contact conductor, and described electrode is bonding with contact conductor by conducting resinl.

3. touch control display apparatus according to claim 1, it is characterized in that, described force snesor is piezoelectric sensor, comprise piezoelectric membrane, described flexible PCB is arranged electrode and the corresponding contact conductor being electrically connected these electrodes, described piezoelectric membrane should be bonding with the electrode pair on flexible PCB by conducting resinl.

4. touch control display apparatus according to claim 1, it is characterized in that, described force snesor is strain force sensor, comprise metal strain meter or semiconductor strain gauge, described semiconductor strain gauge or metal strain meter to be formed with flexible PCB by conducting resinl and are electrically connected, and semiconductor strain gauge or metal strain meter can produce distortion by pressure thus resistance can change.

5. touch control display apparatus according to claim 1, it is characterized in that, described force snesor is resistance-type force snesor, comprise the electrode on the organic composite material film mixing conductive particle and the surface being located at composite material film, when pressurized, the resistance between the electrode of composite material film changes.

6. touch control display apparatus according to claim 1, is characterized in that, described flexible PCB is bar shaped, shaped as frame or block shape.

7. touch control display apparatus according to claim 1, is characterized in that, described display module comprises visible area and is positioned at the non-visible area of periphery, visible area, and described force snesor is placed in the non-visible area of display module.

8. touch control display apparatus according to claim 1, is characterized in that, described force snesor is between flexible PCB and display module.

9. touch control display apparatus according to claim 1, is characterized in that, described pressure touch unit also comprises the compute chip be arranged on flexible PCB.