CN205563517U - Pressure detection structure and touch device - Google Patents
Pressure detection structure and touch device Download PDFInfo
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- CN205563517U CN205563517U CN201620199781.6U CN201620199781U CN205563517U CN 205563517 U CN205563517 U CN 205563517U CN 201620199781 U CN201620199781 U CN 201620199781U CN 205563517 U CN205563517 U CN 205563517U
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- 230000003287 optical effect Effects 0.000 claims abstract description 57
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- 239000002184 metal Substances 0.000 description 19
- 238000004519 manufacturing process Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 17
- 239000004973 liquid crystal related substance Substances 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 101150077194 CAP1 gene Proteins 0.000 description 5
- 101100245221 Mus musculus Prss8 gene Proteins 0.000 description 5
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- 101150014715 CAP2 gene Proteins 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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Abstract
The utility model provides a pressure detection structure and touch device, the structure includes apron, display device and pressure sensor, and display device is located the below of apron, and display device is LCD display device, LCD display device includes display module assembly, optical components that from the top down stacked in proper order to and holding display module assembly and optical components's shell, inside pressure sensor is located display device, among the display device arbitrary electrically conductive regard as reference electrode or there is the deformable clearance layer of pressurized in the center as reference electrode between pressure sensor and the reference electrode, optical components is including being used for providing the backlight subassembly of light source and being used for guiding the light that the backlight subassembly sent to the leaded light subassembly of display module assembly, and the leaded light subassembly is located the below of display module assembly, and the backlight subassembly is located the below of leaded light subassembly, and the backlight subassembly includes the light source and is used for bearing the base plate of light source. The utility model discloses pressure detection can be accurately carried out and the display effect of product can be improved.
Description
Technical Field
The utility model relates to a touch-sensitive screen technical field especially relates to a pressure detection structure and touch device.
Background
Current touch devices, such as touch cell phones, typically utilize pressure sensors to detect the pressure of a human hand's touch. The pressure detection structure of the touch equipment is arranged on a middle frame of the touch equipment and comprises a cover plate, a display device and a pressure sensor. When the display device is an LCD display device (namely, a display screen), the display module is a liquid crystal module, and the display device further comprises an optical assembly and a shell for bearing the liquid crystal module and the optical assembly. When the display device is an LED display device, the display module is an LED module, and the display device further comprises a flexible foam layer for shading and buffering.
Referring to fig. 1.1, fig. 1.2 and fig. 2.1, the implementation manner of pressure detection in the prior art is as follows: when force is applied to the cover plate, the cover plate deforms, so that the distance between the pressure sensor and the display screen is changed, the capacitance between the pressure sensor and the conducting layer on the display screen changes, and the pressure is identified according to the variation. From the realization principle, the detection distance between the display screen and the pressure sensor needs to be well controlled, and the detection distance is the gap shown in the figure. However, the gap is limited by a large number of mass production assembly processes and a large number of assembly parts, resulting in a large assembly tolerance. At the same time, the tolerance of the spacing of the display screen and the pressure sensor between different machines will affect the consistency between machines, resulting in experience differences between machines. Moreover, the size of the gap is easy to change due to the falling and the extrusion deformation of the whole product, which reduces the reliability of the product, and referring to fig. 1.1, the light source 6 is located on the substrate 10, but the backlight source formed by the light source and the substrate is located at the side of the optical assembly, which often causes the problem of poor display effect of the touch device in the prior art, such as uneven or unstable light displayed by the display screen.
Therefore, how to accurately detect the pressure and have a better optical display effect becomes a technical problem to be solved urgently in the prior art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a pressure detection structure and touch device, it can accurately carry out pressure detection and have better display effect.
The utility model provides a pressure detection structure, the structure is installed on the center of touch equipment, including apron, display device and pressure sensor, the display device is located the below of apron, the display device is the LCD display device; the LCD display device comprises a display module, an optical assembly and a shell for accommodating the display module and the optical assembly, wherein the display module and the optical assembly are sequentially stacked from top to bottom; the optical assembly comprises a backlight source assembly used for providing a light source and a light guide assembly used for guiding light rays emitted by the backlight source assembly to the display module, the light guide assembly is positioned below the display module, the backlight source assembly is positioned below the light guide assembly, and the backlight source assembly comprises a light source and a substrate used for bearing the light source.
The utility model also provides a touch device, include the center and install pressure detection structure on the center, pressure detection structure is as above.
According to the technical solution provided by the utility model, with pressure sensor set up in inside the display device, arbitrary electrically conductive piece or electrically conductive center is as the reference electrode in the display device, pressure sensor with there is the deformable clearance layer of pressurized between the reference electrode. Therefore, the problem that the consistency of pressure sensing between the touch equipment is influenced by the tolerance of the distance between the display module and the middle frame is avoided, and the tolerance of the whole assembly of the touch equipment is reduced. And, when the volume production is tested, single display device can carry out pressure test, need not to carry out pressure test with display device and center cooperation, has improved test production efficiency. Simultaneously, it the leaded light subassembly is located the below of display module assembly, the backlight subassembly is located the below of leaded light subassembly for the light that the light source sent can be from the better guide of many angles to display module assembly, and then makes display module assembly and touch device's optical effect better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1.1 is a schematic diagram of a prior art optical assembly;
FIG. 1.2 is a schematic structural diagram of capacitance formed between the detection electrode and the reference electrode of the pressure sensor;
FIG. 2.1 is a schematic diagram of a capacitive structure of a pressure sensing structure in the prior art;
fig. 3.1 is a schematic diagram of a capacitor structure for pressure detection in a pressure detection structure of the present invention;
fig. 3.2 is a schematic diagram of an arrangement position of the pressure sensor in a pressure detecting structure of the present invention;
fig. 4 is a schematic diagram of an arrangement position of a pressure sensor in a pressure detecting structure according to the present invention;
fig. 5 is a schematic diagram of a capacitor structure for pressure detection by a pressure detection structure according to the present invention;
fig. 6 is a schematic structural diagram of an embodiment of a pressure detecting structure according to the present invention;
fig. 7 is a schematic structural diagram of an embodiment of an optical assembly according to the present invention;
fig. 8 is a schematic structural diagram of an embodiment of an optical assembly according to the present invention;
fig. 9 is a schematic structural diagram of an embodiment of a pressure detecting structure according to the present invention;
fig. 10 is a schematic structural view of an embodiment of a pressure sensing structure of the present invention without a back shell;
Fig. 11 is a schematic structural diagram of an embodiment of an optical assembly according to the present invention;
FIG. 12 is a schematic diagram of an embodiment of the present invention in which a pressure sensor is disposed on a substrate of an optical assembly;
fig. 13 is a schematic structural diagram of an embodiment of the present invention in which a pressure sensor is disposed on a substrate of an optical assembly;
fig. 14 is a schematic structural diagram of an embodiment of an optical assembly according to the present invention;
fig. 15 is a schematic structural diagram of an embodiment of an optical assembly according to the present invention;
fig. 16 is a schematic structural diagram of an embodiment of a pressure detecting structure according to the present invention;
Detailed Description
The utility model discloses with pressure sensor set up in inside the display device, arbitrary electrically conductive piece or electrically conductive center are as the reference electrode in the display device, pressure sensor with there is the deformable clearance layer of pressurized between the reference electrode. Therefore, the problem that the consistency of pressure sensing between the touch equipment is influenced by the tolerance of the distance between the display module and the middle frame is avoided, and the tolerance of the whole assembly of the touch equipment is reduced. And, when the volume production is tested, single display device can carry out pressure test, need not to carry out pressure test with display device and center cooperation, has improved test production efficiency. Moreover, the optical assembly comprises a backlight source assembly used for providing a light source and a light guide assembly used for guiding light rays emitted by the backlight source assembly to the display module, the light guide assembly is located below the display module, the backlight source assembly is located below the light guide assembly, the backlight source assembly comprises the light source and a substrate used for bearing the light source, so that light emitted by the light source can be guided to the display module from a plurality of angles, and further the optical effect of the display module and the touch device is better.
Of course, it is not necessary for any particular embodiment of the invention to achieve all of the above advantages at the same time.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention shall fall within the protection scope of the present invention.
The following further illustrates the present invention in connection with the drawings of the present invention.
Referring to fig. 3.1 to 16, the present invention provides a pressure detecting structure, which is installed on a middle frame of a touch device, and includes a cover plate, a display device and a pressure sensor 12, wherein the display device is located below the cover plate, and the display device is an LCD display device;
the LCD display device comprises a display module, an optical component and a shell for accommodating the display module and the optical component, wherein the display module and the optical component are sequentially stacked from top to bottom, the pressure sensor 12 is positioned in the display device, any conductive piece in the display device is used as a reference electrode or the middle frame is used as a reference electrode (namely if the middle frame is a conductive piece, the middle frame can also be used as a reference electrode), and a deformable gap layer exists between the pressure sensor and the reference electrode;
The optical assembly comprises a backlight source assembly for providing a light source and a light guide assembly for guiding light emitted by the backlight source assembly to the display module, the light guide assembly is positioned below the display module, the backlight source assembly is positioned below the light guide assembly, and the backlight source assembly comprises a light source 6 and a substrate 10 for bearing the light source.
In this embodiment, the pressure sensor 12 and the reference electrode are both disposed inside the display device, so that the influence of the tolerance of the distance between the display module and the middle frame on the consistency of pressure sensing between the touch devices is avoided, and the tolerance of the complete machine assembly of the touch devices is reduced. And, when the volume production is tested, single display device can carry out pressure test, need not to carry out pressure test with display device and center cooperation, has improved test production efficiency. Simultaneously, it the leaded light subassembly is located the below of display module assembly, the backlight subassembly is located the below of leaded light subassembly for the light that the light source sent can be from the better guide of many angles to display module assembly, and then makes display module assembly and touch device's optical effect better.
The utility model provides an among the pressure detection structure, it improves light source 6 for all being covered with luminous light source in whole display device's visual zone, and the light source can be ordinary can luminous object, preferably, and the light source also can be luminous bodies such as LED, OLED, and its energy-concerving and environment-protective and luminous effect is better. The light-emitting sources 6 are arranged on top of the substrate, with some control circuitry on the substrate 10 necessary to control the light-emitting sources. The advantage of design like this need not be with light follow side leading-in, but directly shine the propagation towards the LCD module for light can be more even and bright, and then makes touch device display effect better.
Preferably, the pressure sensor is located on a substrate of the backlight assembly. Therefore, the pressure sensor is equivalently positioned inside the display device, and meanwhile, the pressure sensor can integrate a component for detecting pressure into the backlight source assembly, so that the process and the cost can be reduced. More preferably, the pressure sensor is multiplexed with the conductive component on the substrate of the backlight assembly, that is, the conductive component on the substrate of the backlight assembly can be directly multiplexed as the pressure sensor, and further, the process and the cost can be reduced. Pressure sensors may be located on the top and/or bottom of the substrate. Preferably, the OLEDs are uniformly distributed on the substrate, and the pressure sensors are uniformly distributed on the substrate, which can further improve the accuracy of detection and improve the display effect.
Further preferably, the backlight assembly further includes a back plate, and the back plate and the substrate clamp the light source. (i.e., equivalent to two substrates with light-emitting light sources disposed therein, the light-emitting light sources being sealed between the two substrates, the substrate material may be glass, plastic, etc.) which enables the light sources to be made thinner, energy-saving, and more suitable for the light and thin requirements of some users for end products.
Preferably, the substrate is mounted on the housing, and the housing includes a bracket located at a side of the display module and the optical assembly. Also, the housing may include a back shell positioned below the optical assembly and a bracket attached to an edge of the back shell. I.e. the housing may have only lateral supports, which may reduce the process and cost.
The utility model discloses in the concrete realization, when display device is LCD display device, the display module assembly is the liquid crystal module, display device still includes optical assembly 3 and bears the weight of the liquid crystal module assembly with optical assembly 3's shell. As is well known to those skilled in the art, a display module generally includes an upper glass, a lower glass, and various substances between the upper glass and the lower glass, such as a liquid crystal substance between the upper glass and the lower glass, or a liquid crystal layer mixed with other substances (liquid crystal mixture mixed with other substances such as LEDs and liquid crystal layer is not excluded).
The matching relation between the shell and the cover plate 1 can be a full cover type. The shell is larger than the display module, and the display module and the optical assembly 3 are both accommodated in the shell. The housing comprises a back shell 8 and a bracket 4 attached to the edge of said back shell 8. The cover plate 1 is arranged on the top of the bracket 4, and the upper end of the bracket 4 is fixedly connected with the cover plate 1 through adhesive 2 or other modes. For the sake of simplicity, the middle frame is omitted in the drawings in the subsequent embodiments. It should be noted that, the display device has a gap 9 inside, and because the display module and the optical assembly 3 inside the display device are not adhered to each other entirely, the gap 9 is provided between each two display modules and the optical assembly 3, and the gap may be filled with air or flexible filler.
Meanwhile, the matching relationship between the housing and the cover plate 1 can be a partial cover type. The shell is larger than the optical assembly 3 but not larger than the display module, the optical assembly 3 is accommodated in the shell, the display module is arranged on the top of the bracket 4 and is fixedly connected with the upper end of the bracket 4 through adhesive 2 or other methods.
Specifically, the pressure sensor 12 is a capacitive sensor, the detecting electrodes are generally arranged in a matrix as shown in the figure, and the detecting electrodes arranged on the bottom plate need to form a capacitance Cap1 with an external reference electrode as shown in fig. 3.2.
Referring to fig. 3.1 to 3.2, the pressure sensor 12 may be located on a lower surface of the lower glass 221 of the display module.
Specifically, when the display device is an LCD display device, the design material of the pressure sensor 12 is an optically transparent conductive material, such as ITO. Therefore, the pressure sensor 12 can be designed to be thin without increasing the thickness of the display module (liquid crystal module) 22.
When the pressure sensor 12 is located on the upper surface of the lower glass 221 of the display module, the pressure sensor 12 is a driving electrode on the upper surface of the lower glass 221 of the display module.
When the pressure sensor 12 is located on the upper surface of the upper glass of the display module, the pressure sensor 12 is a driving electrode on the upper surface of the upper glass of the display module.
The driving electrodes are in different working states at different moments, the design can reduce the process of adding more conducting layers on the lower glass or the upper glass of the display module, and the cost is reduced.
Specifically, if the middle frame is made of a conductive material such as metal, and the display device is an LCD display device or an LED display device, the conductive middle frame can be used as a reference electrode.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the conductive middle frame. Referring to fig. 4, a capacitance value between the sensing electrode of the pressure sensor 12 and the conductive middle frame as a reference electrode is changed to generate a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
In addition, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In particular, the optical component 3 may be designed to use a material that is conductive or has conductive particles, thereby forming a conductive member as a reference electrode.
When the conductive member of the optical component is used as a reference electrode, the housing may or may not include the back shell 8, or the back shell 8 is not made of metal. Of course, when the housing comprises a metal back shell 8, the conductive element on the optical component 3 may also be used as a reference electrode.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the optical component 3, see fig. 5, the capacitance value between the detection electrode of the pressure sensor 12 and the optical component 3 as a reference electrode changes, generating a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
Moreover, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In yet another embodiment of the present invention, when the pressure sensor 12 is as shown in fig. 3.1 to fig. 8, the display device is an LCD display device, the housing includes a metal back shell 8 and a bracket 4 connected to the edge of the metal back shell 8, and the metal back shell 8 can be used as a reference electrode.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the metal back case 8. referring to fig. 6, the capacitance between the detection electrode of the pressure sensor 12 and the metal back case 8 (conductive material) as a reference electrode changes to generate a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
Moreover, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In yet another embodiment of the present invention, a shielding electrode for shielding the external reference surface is disposed in the display device.
The capacitance between the pressure sensor 12 and the shielding electrode is constant.
The shielding electrode is used for shielding external interference and further controlling tolerance.
Referring to fig. 7, the present invention is implemented by using three electrodes to form two capacitors, the detection electrode of the pressure sensor 12, and the detection electrode is connected to the integrated control chip IC. The capacitance between the sensing electrode and the reference electrode is effectively the deformation sensing capacitance Cap1, i.e., deformation caused by pressure changes the separation between the two electrodes, thereby changing the capacitance. Therefore, the present invention provides a pressure sensor 12 outputting a pressure signal to an integrated control chip IC by detecting the capacitance between its detection electrode and the reference electrode.
The capacitance between the detection electrode and the shielding electrode is a fixed capacitance Cap2, the distance between the two electrodes is not influenced by force, and the shielding electrode mainly plays a role in shielding the influence of other external reference surfaces, so that the deformation effective capacitance is only the capacitance Cap1, which has a great effect on reducing external interference and controlling tolerance.
In particular, the shielding electrode is located in the display device, which is a conductive layer above the location of the pressure sensor 12. The shielding electrode and the reference electrode both function by utilizing the conductive plane existing on the internal structure of the display device itself, and the shielding electrode, the reference electrode, and the pressure sensor 12 (detection electrode) are all inside the display device.
Therefore, the problem that the consistency of pressure sensing between the touch equipment is influenced by the tolerance of the distance between the display module and the middle frame is avoided, and the tolerance of the whole assembly of the touch equipment is reduced. And, when the volume production is tested, single display device can carry out pressure test, need not to carry out pressure test with display device and center cooperation, has improved test production efficiency.
Referring to fig. 5 to 8, when the display device is an LCD display device, the pressure sensor 12 is located on the surface of the optical component 3 included in the display device.
The pressure sensor 12 is made of an optically transparent conductive material, such as ITO. Therefore, the pressure sensor 12 can be designed to be thin without increasing the thickness of the display module.
When the pressure sensor 12 is shown in fig. 8, the reference electrode may be the conductive middle frame included in the touch device.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the conductive middle frame. Referring to fig. 4, a capacitance value between the sensing electrode of the pressure sensor 12 and the conductive middle frame as a reference electrode is changed to generate a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
Moreover, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In another embodiment of the present invention, when the pressure sensor 12 is shown in fig. 8, the reference electrode may be a conductive member inside the display module.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the conductive middle frame. Referring to fig. 9, a capacitance value between the sensing electrode of the pressure sensor 12 and the conductive middle frame as a reference electrode is changed to generate a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
Moreover, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In yet another embodiment of the present invention, when the pressure sensor 12 is shown in the figure, the conductive member on the optical component 3 included in the display device serves as a reference electrode.
In particular, the optical component 3 may be designed to use a material that is conductive or has conductive particles, thereby forming a conductive member as a reference electrode.
When the conductive member of the optical component is used as a reference electrode, the housing does not include the back shell 8, or the back shell 8 is not made of metal. Of course, when the housing comprises a metal back shell 8, the conductive element on the optical component 3 may also be used as a reference electrode.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the optical component 3, see fig. 5, the capacitance value between the detection electrode of the pressure sensor 12 and the optical component 3 as a reference electrode changes, generating a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
Moreover, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In yet another embodiment of the present invention, when the pressure sensor 12 is as shown in fig. 8, the housing includes a metal back shell 8 and a bracket 4 connected to the edge of the metal back shell 8, the metal back shell 8 can be used as a reference electrode.
When the cover plate 1 is pressed, the pressure is transmitted to the display module, so that the display module is deformed. Thereby changing the distance between the detection electrode of the pressure sensor 12 and the metal back case 8. referring to fig. 6, the capacitance between the detection electrode of the pressure sensor 12 and the metal back case 8 (conductive material) as a reference electrode changes to generate a pressure signal.
The tolerance required to be controlled in this embodiment is mainly the thickness of the adhesive between the housing and the display module (partial cover type) or the cover plate 1 (full cover type), and the flatness of the housing. The thickness of the shell and the display module adhesive is easy to control, and the tolerance of the shell and the display module adhesive is small. The flatness of the housing can be highly accurate, and compared with the structural design of fig. 1, the pressure sensing can be more accurately performed in the embodiment.
Moreover, tolerance influence factors are controlled inside the display module, the volume production is better controlled, and the influence of the whole assembly of the touch equipment is not easy to be caused. The influence of the falling, the extrusion deformation and the like of the touch equipment on the pressure sensing of the pressure detection structure is small.
In the preferred embodiment of the present invention, there is a gap between each independent light-emitting source in the backlight, there is a conductive layer on the substrate 10, the detecting electrode of the pressure sensor is designed in the gap between the independent light-emitting sources, and at least one detecting electrode can be multiple.
At this time, the reference electrode may be a conductive layer inside the liquid crystal module, a conductive layer on the lower surface of the lower glass, a conductive optical component, a metal back shell, or a metal middle frame, or a raised reinforcing step may be provided inside the shell, and the light-emitting panel may be erected on the step.
In addition to this, the positions of the pressure detection electrode and the reference electrode can be switched, that is, the conductive layer inside the liquid crystal module, the conductive layer on the lower surface of the lower glass, the conductive optical member, the conductive layer disposed on the metal bezel or the metal back case can be designed as the detection electrode, and then the conductive layer on the light emitting panel can be used as the reference electrode.
In yet another embodiment of the present invention, a shielding electrode for shielding the external reference surface is disposed in the display device.
The capacitance between the pressure sensor 12 and the shielding electrode is constant.
The shielding electrode is used for shielding external interference and further controlling tolerance.
Referring to fig. 7, the present invention is implemented by using three electrodes to form two capacitors, the detection electrode of the pressure sensor 12, and the detection electrode is connected to the integrated control chip IC. The capacitance between the sensing electrode and the reference electrode is effectively the deformation sensing capacitance Cap1, i.e., deformation caused by pressure changes the separation between the two electrodes, thereby changing the capacitance. Therefore, the present invention provides a pressure sensor 12 outputting a pressure signal to an integrated control chip IC by detecting the capacitance between its detection electrode and the reference electrode.
The capacitance between the detection electrode and the shielding electrode is a fixed capacitance Cap2, the distance between the two electrodes is not influenced by force, and the shielding electrode mainly plays a role in shielding the influence of other external reference surfaces, so that the deformation effective capacitance is only the capacitance Cap1, which has a great effect on reducing external interference and controlling tolerance.
In particular, the shielding electrode is located in the display device, which is a conductive layer above the location of the pressure sensor 12. The shielding electrode and the reference electrode both function by utilizing the conductive plane existing on the internal structure of the display device itself, and the shielding electrode, the reference electrode, and the pressure sensor 12 (detection electrode) are all inside the display device.
Therefore, the problem that the consistency of pressure sensing between the touch equipment is influenced by the tolerance of the distance between the display module and the middle frame is avoided, and the tolerance of the whole assembly of the touch equipment is reduced. And, when the volume production is tested, single display device can carry out pressure test, need not to carry out pressure test with display device and center cooperation, has improved test production efficiency.
In another embodiment, the present invention further provides a touch device, which includes a middle frame and a pressure detecting structure mounted on the middle frame, wherein the pressure detecting structure is as above.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (16)
1. A pressure detection structure is arranged on a middle frame of touch equipment and comprises a cover plate, a display device and a pressure sensor, wherein the display device is positioned below the cover plate and is an LCD display device;
the LCD display device comprises a display module, an optical assembly and a shell for accommodating the display module and the optical assembly, wherein the display module and the optical assembly are sequentially stacked from top to bottom;
the optical assembly comprises a backlight source assembly used for providing a light source and a light guide assembly used for guiding light rays emitted by the backlight source assembly to the display module, the light guide assembly is positioned below the display module, the backlight source assembly is positioned below the light guide assembly, and the backlight source assembly comprises a light source and a substrate used for bearing the light source.
2. The pressure sensing structure of claim 1, wherein the light source is an LED.
3. A pressure sensing structure according to claim 2, wherein the light source is an OLED.
4. The pressure detection structure according to claim 2 or 3, wherein the pressure sensor is located on a substrate of the backlight unit.
5. A pressure detecting structure according to claim 2 or 3, wherein the pressure sensor multiplexes conductive members on a substrate of the backlight unit.
6. The pressure sensing structure of claim 5, wherein the pressure sensor is located on the top or bottom of the substrate.
7. The pressure sensing structure of claim 3, wherein the OLEDs are uniformly distributed on the substrate.
8. The pressure detecting structure of claim 7, wherein the pressure sensors are multiplexed with conductive members on a substrate of the backlight assembly, and the pressure sensors are uniformly distributed on the substrate.
9. The pressure detecting structure of claim 8, wherein the backlight assembly further comprises a back plate, and the back plate and the substrate clamp the light source.
10. The pressure sensing structure of claim 1, wherein the substrate is mounted on the housing, and the housing comprises a bracket located at a side of the display module and the optical assembly.
11. The pressure sensing structure of claim 1, wherein the housing comprises a back shell and a bracket attached to an edge of the back shell, the back shell being positioned below the optical assembly.
12. The pressure detecting structure according to claim 1,
the pressure sensor is positioned on the surface of the lower glass or the upper glass of the display module; or,
the pressure sensor is located at a surface of an optical component included in the display device.
13. The pressure detecting structure of claim 12, wherein the pressure sensor is located on an upper surface of a lower glass of the display module, or an upper surface of the upper glass, or a lower surface of the upper glass, and the pressure sensor is a driving electrode of the display module multiplexed.
14. A pressure detecting structure according to claim 12 or 13, wherein a shielding electrode for shielding an external reference surface is provided in the display device;
the capacitance between the pressure sensor and the shield electrode is constant.
15. The pressure detecting structure according to claim 14, wherein the shielding electrode is located in the display device, and the shielding electrode is a conductive member above a position where the pressure sensor is located.
16. A touch device comprising a bezel and a pressure sensing structure mounted on the bezel, wherein the pressure sensing structure is as claimed in any one of claims 1-15.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620199781.6U CN205563517U (en) | 2016-03-15 | 2016-03-15 | Pressure detection structure and touch device |
| PCT/CN2016/103512 WO2017157014A1 (en) | 2016-03-15 | 2016-10-27 | Pressure detection structure and touch apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620199781.6U CN205563517U (en) | 2016-03-15 | 2016-03-15 | Pressure detection structure and touch device |
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| CN205563517U true CN205563517U (en) | 2016-09-07 |
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| WO (1) | WO2017157014A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106527809A (en) * | 2016-11-22 | 2017-03-22 | 厦门天马微电子有限公司 | Touch display panel and driving method thereof |
| CN106527791A (en) * | 2016-11-01 | 2017-03-22 | 上海天马微电子有限公司 | Display panel, display device integrated with pressure induction and driving method |
| WO2017114045A1 (en) * | 2015-12-31 | 2017-07-06 | 深圳市汇顶科技股份有限公司 | Pressure measurement structure and touch device |
| WO2017113952A1 (en) * | 2015-12-31 | 2017-07-06 | 深圳市汇顶科技股份有限公司 | Pressure detecting structure and touch device |
| WO2017157014A1 (en) * | 2016-03-15 | 2017-09-21 | 深圳市汇顶科技股份有限公司 | Pressure detection structure and touch apparatus |
| CN109727532A (en) * | 2017-10-30 | 2019-05-07 | 京东方科技集团股份有限公司 | Flexible display screen and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1716045A (en) * | 2004-06-28 | 2006-01-04 | 鸿富锦精密工业（深圳）有限公司 | Module backlight and liquid crystal indicator |
| KR20150096104A (en) * | 2014-02-14 | 2015-08-24 | 한상호 | Display Device Having Tri-axis Sensing Type Capacitive Touch Screen |
| CN204759381U (en) * | 2015-07-20 | 2015-11-11 | 深圳市汇顶科技股份有限公司 | Touch -sensitive screen terminal with pressure detection function |
| CN105068695A (en) * | 2015-09-11 | 2015-11-18 | 京东方科技集团股份有限公司 | Touch display panel with pressure detection function, display device and driving method |
| CN105138183B (en) * | 2015-09-25 | 2019-05-03 | 敦泰电子有限公司 | A kind of electronic equipment with pressure detecting function |
| CN205563517U (en) * | 2016-03-15 | 2016-09-07 | 深圳市汇顶科技股份有限公司 | Pressure detection structure and touch device |
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2016
- 2016-03-15 CN CN201620199781.6U patent/CN205563517U/en active Active
- 2016-10-27 WO PCT/CN2016/103512 patent/WO2017157014A1/en active Application Filing
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| WO2017114045A1 (en) * | 2015-12-31 | 2017-07-06 | 深圳市汇顶科技股份有限公司 | Pressure measurement structure and touch device |
| WO2017113952A1 (en) * | 2015-12-31 | 2017-07-06 | 深圳市汇顶科技股份有限公司 | Pressure detecting structure and touch device |
| WO2017157014A1 (en) * | 2016-03-15 | 2017-09-21 | 深圳市汇顶科技股份有限公司 | Pressure detection structure and touch apparatus |
| CN106527791A (en) * | 2016-11-01 | 2017-03-22 | 上海天马微电子有限公司 | Display panel, display device integrated with pressure induction and driving method |
| CN106527791B (en) * | 2016-11-01 | 2019-06-25 | 上海天马微电子有限公司 | Display panel, display device integrated with pressure induction and driving method |
| CN106527809A (en) * | 2016-11-22 | 2017-03-22 | 厦门天马微电子有限公司 | Touch display panel and driving method thereof |
| CN106527809B (en) * | 2016-11-22 | 2019-08-02 | 厦门天马微电子有限公司 | A kind of touch-control display panel and its driving method |
| CN109727532A (en) * | 2017-10-30 | 2019-05-07 | 京东方科技集团股份有限公司 | Flexible display screen and display device |
| US11756457B2 (en) | 2017-10-30 | 2023-09-12 | Ordos Yuansheng Optoelectronics Co., Ltd. | Flexible display screen and display device |
Also Published As
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| WO2017157014A1 (en) | 2017-09-21 |
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