CN205015877U - Touch display device - Google Patents

Abstract

The utility model relates to a touch display device, including protection apron, touch -sensitive unit and display element, the touch -sensitive unit is used for the response to exert the touch signal on the protection apron, still be provided with the forced induction unit in the display element, the forced induction unit includes the substrate, forms the spaced electrode a plurality of of each other on the substrate to and the quick resistance layer of power of the adjacent electrode of connection, the quick resistance layer of doing all can includes insulating body and the conductive particle of dispersion in insulating body. The utility model discloses with forced induction unit integrated to the display element in, this forced induction unit can detect multi -touch's pressure signal through setting up the quick resistance layer of power simultaneously.

Description

touch display device

technical field

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

Background technique

Due to its advantages of ease of operation and flexibility, the touch screen has become the main means of human-computer interaction for personal mobile communication devices and comprehensive information terminals (such as mobile phones, tablet computers and super notebook computers, etc.). Compared with resistive touch screens and other types of touch screens, capacitive touch screens are gradually being widely used in smart terminals due to their advantages of low cost, simple structure, and durability. However, the existing capacitive touch screen only senses the touch position and operation on the plane where the screen body is located, and it is difficult to sense the touch parameters brought about by the change of pressure applied to the surface of the screen body.

In order to sense pressure changes on the surface of the screen, manufacturers integrate pressure sensors into the touch screen. However, most of the existing methods can only detect the touch pressure information of a single point.

Utility model content

Based on this, the utility model aims to provide a touch display device capable of detecting multi-point touch pressure signals.

A touch display device, comprising a protective cover, a touch sensing unit and a display unit, the touch sensing unit is used to sense a touch signal applied to the protective cover, the display unit is also provided with a pressure sensing unit, the The pressure sensing unit includes a base material, a plurality of mutually spaced electrodes formed on the base material, and a force-sensitive resistor layer connecting adjacent electrodes. The force-sensitive resistor layer includes an insulating matrix and conductive particles dispersed in the insulating matrix.

In one embodiment, there is one substrate in the pressure sensing unit, and the electrodes are distributed on a surface of the substrate.

In one embodiment, there are two substrates in the pressure sensing unit, and the electrodes are distributed on two adjacent surfaces of the two substrates.

In one embodiment, the force sensitive resistor layer covers the entire surface of the substrate.

In one of the embodiments, the force sensitive resistor layer covers the intersection positions of the electrodes on the two substrates.

In one embodiment, the display unit includes a liquid crystal functional layer and a backlight module, the backlight module includes a laminated optical film and a protective metal sheet for protecting the optical film, and the pressure sensing unit is located in the optical Between the diaphragm and the protective metal sheet.

In one of the embodiments, an elastic compressible layer is provided between the pressure sensing unit and the optical film.

In one embodiment, the pressure sensing unit is glued on the protective metal sheet, and is located between the elastic compressible layer and the protective metal sheet.

In one of the embodiments, the touch sensing unit is integrated in the display unit.

The above-mentioned touch display device integrates the pressure sensing unit into the display unit, and at the same time, the pressure sensing unit can detect multi-point touch pressure signals by setting a force-sensitive resistor layer.

Description of drawings

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

FIG. 2 is a schematic structural diagram of a pressure sensing unit in the touch display device shown in FIG. 1 .

3 and 4 are schematic diagrams of different layer structures in the pressure sensing unit shown in FIG. 2 .

FIG. 5 is a schematic structural diagram of a pressure sensing unit in a touch display device provided by another embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of the pressure sensing unit shown in FIG. 5 .

FIG. 7 is a partial structural diagram of a pressure sensing unit in a touch display device provided by another embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of the pressure sensing unit shown in FIG. 7 .

detailed description

The touch display device provided by the utility model can be used as a touch-interactive display terminal of mobile phones, tablet computers and the like.

As shown in FIG. 1 , the touch display device includes a protective cover 10 , a touch sensing unit 20 , a display unit and a pressure sensing unit 70 .

The touch sensing unit 20 includes touch driving electrodes and touch sensing electrodes. The touch driving electrodes and the touch sensing electrodes can be distributed on the same substrate, such as the so-called GF structure, GF2 structure, etc. in the industry, or respectively distributed on two different substrates, such as the GFF structure called in the industry. In some other embodiments, the touch driving electrodes and the touch sensing electrodes may also be formed on the lower surface of the protective cover 10 so that the protective cover 10 also functions as a capacitive sensor. This structure is called an OGS structure in the industry. The term "up" and "down" in the present invention refer to the degree of proximity of the touch display device to the user during the application process. The side relatively close to the user is "up", and the side relatively far away from the user is "up". For "down". For example, the lower surface of the protective cover refers to the side of the protective cover away from the user. In some other embodiments, one of the two types of touch electrodes may also be formed on the surface of the substrate attached to the protective cover 10 , such as the so-called G1F structure in the industry.

The display unit includes a liquid crystal functional layer 50 and a backlight module 60. The liquid crystal functional layer 50 includes an upper polarizer 51, a filter 52, a liquid crystal layer 53, a substrate 54, and a lower polarizer 55 arranged in sequence. The backlight The module 60 includes an optical film and a protective metal sheet 64 for protecting the optical film. The optical film may include structures such as a diffusion sheet 61 , a light guide plate 62 , and a reflection sheet 63 arranged in sequence.

In some other embodiments, the touch driving electrodes and the touch sensing electrodes in the touch sensing unit 20 can also be integrated in the liquid crystal layer 53 (the structure of the above touch sensing unit is called in-cell structure in the industry), or the touch The driving electrodes and the touch sensing electrodes are disposed between the upper polarizer 51 and the filter 52 (the structure of the above touch sensing unit is called an on-cell structure in the industry).

The touch driving electrodes and the touch sensing electrodes are used for sensing touch signals applied on the protective cover 10 . The touch signals include touch input signals such as touch, slide, and drag in a two-dimensional direction parallel to the protective cover 10, and even include space input signals in a direction perpendicular to the protective cover 10 (ie, floating touch signals). Or the touch input signal of the side of the edge of the protective cover 10 (for example, the curved side of the curved screen).

The pressure sensing unit 70 is disposed in the display unit for sensing a pressure signal applied to the protective cover 10 . Specifically, the pressure sensing unit is located between the optical film and the protective metal sheet 64 .

In some embodiments, an elastic compressible layer (not shown) is provided between the pressure sensing unit 70 and the optical film (specifically, the reflective sheet 63 ). The elastic compressible layer can be made of foam, sponge, porous silica gel and other porous materials. The pressure sensing unit 70 can be glued on the protective metal sheet 64 by water glue or solid glue, and is located between the elastic compressible layer and the protective metal sheet 64 .

The pressure sensing unit includes a base material, a plurality of mutually spaced electrodes formed on the base material, and a force-sensitive resistor layer connecting adjacent electrodes, and the force-sensitive resistor layer includes an insulating matrix and conductive electrodes dispersed in the insulating matrix. particles.

The force-sensitive resistance layer is composed of quantum tunnel composite material, which may be a pressure-sensitive composite material doped with conductive particles. The fine conductive particles in the force sensitive resistor layer are uniformly dispersed in the insulating matrix. The insulating matrix can be made of polyester fiber, epoxy resin, polyester, silicone, rubber and other materials. Conductive particles can be metal particles, such as nickel, silver, copper powder or metal alloy particles, or carbon black, graphite, carbon nanotubes, or conductive oxides such as indium tin oxide, indium oxide, tin oxide , zinc oxide, titanium oxide, etc. The conductive particle size is 10nm-100μm. The force-sensitive resistor layer can be made with force-sensitive ink on the base material by means of screen printing, inkjet printing, photolithography, coating and the like. Among them, the force-sensitive ink is prepared from the above-mentioned insulating matrix, conductive particles, solvents, curing agents, etc., and can be cured by heating or UV irradiation. The solvent may be one or a combination of common organic solvents such as 2-butanone, glycol ether and tetrahydrofuran. A suitable type of curing agent such as aliphatic amines, amidoamines, etc. can also be selected according to the type of insulating substrate.

As shown in FIG. 2 , FIG. 3 and FIG. 4 , there are two substrates in the pressure sensing unit, and the electrodes are distributed on two adjacent surfaces of the two substrates. Specifically, electrodes 710 are formed on the substrate 71 . Since the pressure sensing unit is disposed between the protective metal sheet 64 and the reflective sheet 63 of the display unit, no light-transmitting design is required, so the base material 71 can be made of transparent or non-transparent materials. The electrode 710 can be fabricated on the substrate 71 by means of deposition/etching or the like. The electrode 720 on the substrate 72 has similar features, and the electrode 710 and the electrode 720 have different extension directions. When the two substrates 71 and 72 are butted, the electrodes 710 and 720 have a crossing position. Force sensitive resistor layers 73 are provided at these crossing locations. The two substrates 71, 72 can be combined together in the form of frame stickers.

It can be understood that in the above embodiments, the force sensitive resistor layer 73 may also be one layer and cover the entire surface of the substrate 71 or the substrate 72 .

It can be understood that the shapes of the electrodes 710 and 720 are not limited to the strip electrodes shown in FIG. 3 and FIG. 4 , but may also be independent block electrodes and the like.

The pressure detection principle of the above-mentioned pressure sensing unit is that when the force-sensitive resistor layer 73 is not under pressure, the conductive particles in the force-sensitive resistor layer 73 are far away, and the force-sensitive resistor layer 73 is in an insulating or high-resistance state; When the layer 73 is under pressure, the insulating matrix is compressed, and the distance between the conductive particles becomes shorter. Due to the quantum tunneling effect, the electron migration ability between the conductive particles is enhanced, which is reflected in the resistance of the force sensitive resistor layer 73 macroscopically. value decreases. As the pressure on the force sensitive resistor layer 73 increases, the resistance value between the electrodes connected to it decreases gradually. Therefore, a database of correlations between the electrode resistance change information in the aforementioned pressure sensing unit of the touch display device and the force information of the touch display device can be established. In practical applications, the touch display device further includes a memory and a processor, and the memory stores the information of each adjacent electrode that detects force in the touch display device when different force values are touched at different positions in the touch display device. Resistance change information, the processor is used to compare the resistance change information of the adjacent electrodes detected by the touch display device with the pre-stored resistance change information, so as to judge the touch information of the touch display device. The touch information includes the magnitude of the touch force, and may also include the position of the touch force.

In an embodiment, when the touch sensing unit and the pressure sensing unit are in the working state at the same time, if the touch sensing unit and the pressure sensing unit detect a touch operation event, the touch display device uses the touch sensing unit to identify the touch operation position The touch display device uses the pressure sensing unit to identify the touch operation pressure; if the touch sensing unit does not detect a touch operation event but the pressure sensing unit detects a touch operation event, the touch display device uses the touch operation event The pressure sensing unit identifies the touch operation position and touch operation pressure.

As shown in FIG. 5 and FIG. 6 , in another embodiment, there is one substrate 71 in the pressure sensing unit 70 , and the electrodes 710 are distributed on a surface of the substrate 71 . The force sensitive resistor layer 73 connects adjacent electrodes 710 .

As shown in FIG. 7 and FIG. 8 , the force sensitive resistor layer 73 may be an entire layered structure covering the substrate 71 to connect all the electrodes 710 .

The utility model integrates the pressure sensing unit into the display unit, and at the same time, the pressure sensing unit can detect multi-point touch pressure signals by setting a force sensitive resistance layer, and has the advantage of high detection accuracy.

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 interpreted as a limitation on the patent scope of the utility model. 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 display device, comprising a protective cover, a touch sensing unit and a display unit, the touch sensing unit is used to sense a touch signal applied to the protective cover, wherein the display unit is also provided with A pressure sensing unit, the pressure sensing unit includes a base material, a plurality of mutually spaced electrodes formed on the base material, and a force-sensitive resistor layer connecting adjacent electrodes, the force-sensitive resistor layer includes an insulating matrix and is dispersed in an insulating Conductive particles in the matrix. 2 . The touch display device according to claim 1 , wherein there is one substrate in the pressure sensing unit, and the electrodes are distributed on a surface of the substrate. 3 . 3 . The touch display device according to claim 1 , wherein there are two substrates in the pressure sensing unit, and the electrodes are distributed on two adjacent surfaces of the two substrates. 4 . 4. The touch display device according to claim 2 or 3, wherein the force sensitive resistor layer covers the entire surface of the substrate. 5 . The touch display device according to claim 3 , wherein the force sensitive resistor layer covers the intersection positions of the electrodes on the two substrates. 6 . 6. The touch display device according to claim 1, wherein the display unit includes a liquid crystal functional layer and a backlight module, and the backlight module includes a laminated optical film and a protective film for protecting the optical film. The metal sheet, the pressure sensing unit is located between the optical diaphragm and the protective metal sheet. 7. The touch display device according to claim 6, wherein an elastic compressible layer is provided between the pressure sensing unit and the optical film. 8 . The touch display device according to claim 7 , wherein the pressure sensing unit is bonded to the protective metal sheet and located between the elastic compressible layer and the protective metal sheet. 9. The touch display device according to claim 1, wherein the touch sensing unit is integrated in a display unit.