CN107918502A - Mutual capacitance type pressure sensor and touch control display apparatus and its pressure sensing method - Google Patents
Mutual capacitance type pressure sensor and touch control display apparatus and its pressure sensing method Download PDFInfo
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- CN107918502A CN107918502A CN201610882625.4A CN201610882625A CN107918502A CN 107918502 A CN107918502 A CN 107918502A CN 201610882625 A CN201610882625 A CN 201610882625A CN 107918502 A CN107918502 A CN 107918502A
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- 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
- G06F3/0412—Digitisers structurally integrated in a display
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The present invention, which provides a kind of mutual capacitance type pressure sensor and touch control display apparatus and its pressure sensing method, wherein touch control display apparatus, includes touch-control display panel, backlight module and pressure sensor.Backlight module is arranged on the back side of touch-control display panel.Pressure sensor includes the first conductive layer, the second conductive layer, insulating layer and the 3rd conductive layer.First conductive layer is arranged between touch-control display panel and backlight module, and the second conductive layer is arranged between the first conductive layer and backlight module, and insulating layer is arranged between the first conductive layer and the second conductive layer.Backlight module is arranged between the second conductive layer and the 3rd conductive layer, and the first conductive layer, the second conductive layer are electrically insulated from the 3rd conductive layer.
Description
Technical field
The present invention is on a kind of mutual capacitance type pressure sensor (force sensor) and has the function of pressure-sensing
Touch control display apparatus and its pressure sensing method, the mutual capacitance type pressure sensor and have that espespecially a kind of detectable multiple spot presses
The touch control display apparatus of pressure-sensing function and its pressure sensing method.
Background technology
As science and technology is maked rapid progress, touch technology has been widely used in the consumption electronic products of various kinds, such as intelligence
The portable electronic products such as mobile phone (smart phone), automobile-used Touch Screen and laptop.What is had been developed at present touches
Control technology species is also more and more various, such as resistance-type, condenser type, optical profile type or electromagnetic touch-control etc., it is used to detection hand
The position of finger or stylus touch electronic device so that electronic device can pass through the further execution pair of detected position of touch
The instruction answered, therefore user can perform desired function by way of touch-control.However, contact panel now is only capable of leading to
Cross and detect the position of touch-control to perform corresponding single instruction, but can not simultaneously be performed by disposable touch further
Instruction, therefore can not simultaneously meet that user more efficiently and more intuitively passes on its purpose in human-computer interaction to electronic device
Demand.
The content of the invention
It is a primary object of the present invention to provide a kind of mutual capacitance type pressure sensor (force sensor) and with pressure
The touch control display apparatus of power sensing function and its pressure sensing method, to allow user to carry out multiple fingers in a touch action
Order, so lift user can the function quantity that reaches of intuitive.
Above-mentioned to achieve the purpose that, present invention offer is a kind of to have the function of the touch control display apparatus of pressure-sensing, including one
Touch-control display panel, a backlight module and a pressure sensor.Touch-control display panel have a display surface relative to each other with
An and back side.Backlight module is arranged on the back side.Pressure sensor includes one first conductive layer, one second conductive layer, an insulation
Layer and one the 3rd conductive layer.First conductive layer is arranged between touch-control display panel and backlight module.Second conductive layer is set
Between the first conductive layer and backlight module.Insulating layer is arranged between the first conductive layer and the second conductive layer.Backlight module is set
It is placed between the second conductive layer and the 3rd conductive layer, and the first conductive layer, the second conductive layer and the 3rd conductive layer are electrically exhausted each other
Edge.
Above-mentioned to achieve the purpose that, the present invention separately provides a kind of mutual capacitance type pressure sensor, including one first conductive layer, one
Second conductive layer, an insulating layer, one the 3rd conductive layer and a compressible dielectric layer.First conductive layer includes a plurality of first electrode
Bar.Second conductive layer includes a plurality of second electrode bar, interlocks with first electrode bar.Insulating layer is arranged at the first conductive layer and second
Between conductive layer.Second conductive layer is arranged between the first conductive layer and the 3rd conductive layer, and the first conductive layer, the second conductive layer
It is electrically insulated from the 3rd conductive layer.Compressible dielectric layer is arranged between the second conductive layer and the 3rd conductive layer.
In order to achieve the above object, the present invention provides a kind of pressure sensing method of touch control display apparatus again.First, there is provided touch
Display device is controlled, wherein touch control display apparatus includes a touch-control display panel, a backlight module and a pressure sensor.Touch-control
Display panel has a display surface relative to each other and a back side.Backlight module is arranged on the back side.Pressure sensor includes
One first conductive layer, one second conductive layer, an insulating layer, one the 3rd conductive layer and a compressible dielectric layer.First conductive layer
It is arranged between touch-control display panel and backlight module, and including a plurality of first electrode bar.Second conductive layer is arranged at first and leads
Between electric layer and backlight module, and including a plurality of second electrode bar, interlock with first electrode bar.It is conductive that insulating layer is arranged at first
Between layer and the second conductive layer.Backlight module is arranged between the second conductive layer and the 3rd conductive layer, and the first conductive layer, second
Conductive layer is electrically insulated from the 3rd conductive layer.Compressible dielectric layer is arranged between the second conductive layer and the 3rd conductive layer,
And compressible dielectric layer has a first thickness before undeformed.Then, when pressure sensor is not yet pressed, provide respectively
Multiple drive signals receive multiple first capacitance signals from second electrode bar respectively to first electrode bar, and conductive by the 3rd
Layer is electrically connected to a reference voltage.Then, when at least position pressing of pressure sensor, cause to correspond to pressing for this position
During first thickness one second thickness of boil down to of contracting dielectric layer, drive signal is provided again respectively to first electrode bar, and from right
An at least second electrode bar for this position is answered to receive at least one second capacitance signal.Then, the of relatively corresponding second electrode article
One capacitance signal and the second capacitance signal, to obtain at least one pressing force value.
The touch control display apparatus of the present invention is due to being provided with mutual capacitance type pressure sensor therefore can not only have touch-control sensing
Function, can also have the function of pressure-sensing.In addition, since the mutual capacitance type pressure sensor of the present invention not only can detect single-point
The power of pressing, the power of also detectable multiple spot pressing, therefore user not only can perform multiple spot on touch control display apparatus and touch
The function of control, can also carry out a variety of instructions in a touch action, and then lift the accessible function number of a touch action
Amount.
Brief description of the drawings
For the above objects, features and advantages of the present invention can be become apparent, the tool below in conjunction with attached drawing to the present invention
Body embodiment elaborates, wherein：
Fig. 1 illustrates the schematic top plan view of the mutual capacitance type pressure sensor of first embodiment of the invention.
Fig. 2 is diagrammatic cross-sections of the Fig. 1 along hatching line A-A '.
Fig. 3 illustrates the diagrammatic cross-section with the touch control display apparatus of pressure-sensing of second embodiment of the invention.
Fig. 4 is the flow chart of the pressure sensing method of the touch control display apparatus of second embodiment of the invention.
The state when touch control display apparatus that Fig. 5 illustrates second embodiment is not yet pressed.
Fig. 6 illustrate second embodiment touch control display apparatus it is depressed when state.
Fig. 7 illustrates the pressing force value of an example and the relation schematic diagram of capacitance change of the invention.
Fig. 8 illustrates the position of coupled capacitor and the relation of capacitance change when touch control display apparatus is pressed by two touch objects
Schematic diagram.
Component label instructions are as follows in figure：
100th, 206 pressure sensor, 102 first conductive layer
104 second conductive layer of 102S first electrodes bar
The 3rd conductive layer of 104S second electrodes article 106
108 insulating layer, 110 compressible dielectric layer
112 substrate, 200 touch control display apparatus
202 touch-control display panel 202a display surfaces
204 backlight module of the 202b back sides
208 adhesion coating EP extensions
EP1 the first extension the second extensions of EP2
SP stripes D1 first directions
D2 second direction Z upright projections direction
T1 first thickness T2 second thickness
G1 the first spacing the second spacing of G2
EL power lines
S10, S20, S30, S40 step
Embodiment
Please refer to Fig.1 and Fig. 2, Fig. 1 illustrate first embodiment of the invention mutual capacitance type pressure sensor schematic top plan view,
Fig. 2 is diagrammatic cross-sections of the Fig. 1 along hatching line A-A '.As shown in Figures 1 and 2, the mutual capacitance type pressure that the present embodiment is provided passes
Sensor 100 may include the first conductive layer 102, the second conductive layer 104, the 3rd conductive layer 106, insulating layer 108 and compressible Jie
Electric layer 110, and the first conductive layer 102, insulating layer 108, the second conductive layer 104,110 and the 3rd conductive layer of compressible dielectric layer
106 are sequentially formed on a surface of substrate 112.Substrate 112 may include hard substrate such as glass substrate, protective substrate
(cover lens), protective glass (cover glass) or flexible substrate/film substrate (flexible substrate/
Film substrate) such as the substrate that plastic substrate or other suitable materials are formed.Alternatively, substrate 112 can be electronics
Device such as touch-control display panel.In this present embodiment, the first conductive layer 102 includes a plurality of first electrode bar 102S, respectively edge
First direction D1 settings, and the second conductive layer 104 includes a plurality of second electrode bar 104S, respectively along different from first direction
The second direction D2 of D1 is set so that second electrode bar 104S and first electrode bar 102S are interlaced.Insulating layer 108 is arranged at
Between first conductive layer 102 and the second conductive layer 104, to the first conductive layer 102 and the second conductive layer 104 of being electrically insulated, because
This each first electrode bar 102S and staggered second electrode bar 104S intercouple in staggered place and then form a coupled capacitor.
Second conductive layer 104 is arranged between the first conductive layer 102 and the 3rd conductive layer 106, and compressible dielectric layer 110 is arranged at
Between two conductive layers 104 and the 3rd conductive layer 106, therefore the second conductive layer 104 can be electrically insulated with the 3rd conductive layer 106.By
It can not only be electrically insulated the second conductive layer 104 and the 3rd conductive layer 106, can also have compressible in compressible dielectric layer 110
Characteristic；When mutual capacitance type pressure sensor 100 is depressed, the thickness of compressible dielectric layer 110 produces change, causes to be detected
Can be with the thickness change of compressible dielectric layer 110 to the coupled capacitor between first electrode bar 102S and second electrode bar 104S
And change, and then the amplitude of pressing can be calculated by capacitance change.For example, compressible dielectric layer 110 includes air
Or elastic material.
In this present embodiment, each second electrode bar 104S may include that a stripes SP is mutually handed over first electrode bar 102S
It is wrong.In addition, each second electrode bar 104S is optionally included with multiple extension EP, respectively from least the one of stripes SP
Extend side.Specifically, extension EP may include the first extension EP1 and the second extension EP2, and the first extension EP1
Extend respectively from the two opposite sides of stripes SP with the second extension EP2.It is preferred that each first extension EP1 can with it is opposite
The the second extension EP2 answered is set on the same line so that stripes SP and the first extension EP1 and the second extension
EP2 may make up grating structure.However, the present invention is not limited thereto, each first extension EP1 can be with corresponding second extension EP2 edges
Stripes SP also can be line symmetrically but not set on the same line.For example, each second electrode bar 104S and first
The intersection point of electrode strip 102S can have two extension EP, its respective first extension EP1 and corresponding second extension
EP2 can be symmetrical as line using stripes SP but be not set on the same line, and this two extension EP is with perpendicular to stripes
A straight line of SP is symmetrical for line so that measurable to equal around the intersection point of each second electrode bar 104S and first electrode bar 102S
Even and larger sensing amount.In addition, each first electrode bar 102S can be driving electrodes, respectively to transmit a drive signal, and
Each second electrode bar 104S can be induction electrode, be sensed respectively because with the mutual capacitive couplings of corresponding first electrode bar 102S
Drive signal, and then produce sensed capacitance signal.Second electrode bar 104S can detect that by the change of capacitance signal
Coupled capacitor change between first electrode bar 102S.It is preferred that the width of each first electrode bar 102S can be more than each strip
The width of portion SP so that the first electrode bar 102S as driving electrodes can be used to masking produced by above substrate 112 or its
Signal interference, to improve the sensitivity of pressure-sensing.Also, an at least extension EP of each second electrode bar 104S can be in vertical
It is overlapping with a first electrode bar 102S on straight projecting direction Z, it first electrode bar 102S is covered extension EP, may be used also
Increase the coupled capacitor between first electrode bar 102S and second electrode bar 104S.In this present embodiment, each second electrode bar
The two first extension EP1 and two second extension EP2 of 104S are overlapping with same first electrode bar 102S, but are not limited to
This.In another embodiment, the second conductive layer 104 can separately include multiple floating electrodes, be respectively arranged at two the second adjacent electricity
Between the bar 104S of pole, and floating electrode is separated with second electrode bar 104S, and is in floating.Pass through setting for floating electrode
The capacitance signal that second electrode bar 104S is sensed can be increased by putting, and then promotion signal sensed quantity.It will be appreciated that each first
Electrode strip 102S also can be induction electrode, and make each second electrode bar 104S be driving electrodes, its operating mode is also such as above-mentioned, in
This is repeated no more.
In addition, the 3rd conductive layer 106 can be a plane electrode, a reference voltage is electrically connected to, such as is grounded, and is covered
First conductive layer 102 and the second conductive layer 104, make each staggered place of first electrode bar 102S and second electrode bar 104S can
In overlapping with the 3rd conductive layer 106 on the Z of upright projection direction, the coupled capacitor of each staggered place can be made way for whereby depressed
When influenced be subject to the 3rd conductive layer 106 individually.Specifically, can have between the 3rd conductive layer 106 and the second conductive layer 104
Predetermined spacing so that the 3rd conductive layer 106 and each coupled capacitor when being not affected by pressing with identical spacing, therefore
The capacitance signal that two electrode strip 104S are sensed is rough identical each other.It is right when mutual capacitance type pressure sensor 100 is depressed
The spacing between the second electrode article 104S of pressing position and the 3rd conductive layer 106 is answered to reduce so that second electrode bar 104S
The capacitance signal sensed is subject to the influence of the reference voltage of the 3rd conductive layer 106 also to produce change, and then can detect that
The amplitude of pressing.Specific function mode will be incorporated to described in the pressure sensing method of touch control display apparatus hereinafter.
The mutual capacitance type pressure sensor of the present invention can be applied to touch control display apparatus, be allowed disposably with touch controllable function of arranging in pairs or groups
Touch can reach execution multiple instruction.Please refer to Fig.3, what Fig. 3 illustrated second embodiment of the invention has feeling of stress measurement of power
The diagrammatic cross-section of the touch control display apparatus of energy.As shown in figure 3, the touch control display apparatus 200 that the present embodiment is provided may include
Touch-control display panel 202, backlight module 204 and pressure sensor 206.Touch-control display panel 202 has relative to each other one
A display surface 202a and back side 202b.Touch-control display panel 202 may be, for example, the liquid crystal display panel for being collocated with touch controllable function,
Wherein touch-control display panel 202 can include embedded (in-cell/on-cell), external hanging type (out-cell) or mixing type
(hybrid in-cell) contact panel, makes touch control display apparatus 200 have the function of touch-control sensing, but be not limited.It is familiar with
The personage Ying Zhi contact panels of the skill also can be the other kinds of contact panels such as resistance-type, electromagnetic type or optical profile type.Backlight
Module 204 is arranged on the back side 202b of touch-control display panel 202, to the light as 202 display picture of touch-control display panel
Source.Backlight module 204 may be, for example, side-light type or direct type backlight module.
In this present embodiment, pressure sensor 206 may include that the first conductive layer 102, the second conductive layer the 104, the 3rd are conductive
Layer 106, insulating layer 108 and compressible dielectric layer 110.First conductive layer 102 is arranged at touch-control display panel 202 and backlight mould
On back side 202b between block 204, the second conductive layer 104 is arranged between the first conductive layer 102 and backlight module 204, and absolutely
Edge layer 108 is arranged between the first conductive layer 102 and the second conductive layer 104.Insulating layer 108 may include an Optical transparent adhesive, use
The second conductive layer 104 is pasted on the first conductive layer 102, and the first conductive layer 102 of offer and the second conductive layer 104 are electrical
The use of insulation.First conductive layer 102,108 and second conductive layer 104 of insulating layer are the back side for being pasted on touch-control display panel 202
On 202b.For example, the first conductive layer 102 and the second conductive layer 104 can be first respectively formed on a film, and pass through insulation
Film with the second conductive layer 104 is pasted on the film with the first conductive layer 102 by layer 108.Also, pressure sensor
206 can separately include a such as Optical transparent adhesive of adhesion coating 208, the film with the first conductive layer 102 is pasted on touch-control
On the back side 202b of display panel 202.In another alternate embodiment, the first conductive layer 102 also can directly pass through Lithography Etching
Or screen printing processing is formed on the back side 202b of touch-control display panel 202.Insulating layer 108 may include organic or inorganic material, shape
Into on the first conductive layer 102.Second conductive layer 104 directly can be formed at insulating layer by another Lithography Etching or screen printing processing
On 108.In this present embodiment, the first conductive layer 102 and the second conductive layer 104 can preferably include transparent conductive material respectively, with
Avoid stopping that the light of backlight module 204 is injected in touch-control display panel 202, and reduce the picture to touch control display apparatus 200
The influence of brightness.First conductive layer 102 of the present embodiment, the structure of the second conductive layer 104 and the 3rd conductive layer 106 and first are real
It is identical to apply example, therefore not described here any more.
In addition, the 3rd conductive layer 106 is arranged under backlight module 204, i.e., backlight module 204 is arranged at the second conductive layer
104 and the 3rd between conductive layer 106.It is noted that the 3rd conductive layer 106 can be fixed on a firmware or be a firmware,
And touch-control display panel 202 can be a hard support plate, so as to supporting and fixed the first conductive layer 102 pasted thereon, insulation
108 and second conductive layer 104 of layer so that when touch control display apparatus 200 is not affected by pressing, the 3rd conductive layer 106 is led with second
There can be predetermined spacing between electric layer 104, and be uniformity.For example, the 3rd conductive layer 106 can be a metal frame,
To house touch-control display panel 202, backlight module 204 and the first conductive layer 102 and the second conductive layer between the two
104, and the 3rd conductive layer 106 can be electrically connected to the minimum voltage of 200 system of touch control display apparatus, such as ground voltage or common
Same voltage.It should be noted that when backlight module 204 has flexible, the first conductive layer 102, insulating layer 108, the second conductive layer 104
It is not securable on backlight module 204 with the 3rd conductive layer 106, to avoid when touch control display apparatus 200 is not affected by pressing
Spacing between three conductive layers 106 and the second conductive layer 104 produces change.Led in addition, compressible dielectric layer 110 is arranged at second
Between 104 and the 3rd conductive layer 106 of electric layer.In this present embodiment, compressible dielectric layer 110 may be disposed at backlight module 204 with
Between 3rd conductive layer 106, and including air or elastic material.For example, 204 and the 3rd conductive layer 106 of backlight module it
Between can have accommodating space so that compressible dielectric layer 110 can be the air being arranged in accommodating space or be arranged at accommodating sky
Interior elastic material.In another alternate embodiment, compressible dielectric layer 110 also can be that backlight module 204 and second is conductive
Air or elastic material between layer 104.
What deserves to be explained is first conductive layer 102 of the present embodiment, insulating layer 108 be arranged at the second conductive layer 104 it is tactile
Control between display panel 202 and backlight module 204, to effectively utilize between backlight module 204 and touch-control display panel 202
Space, and touch control display apparatus 200 can be reduced because being provided with pressure sensor 206 and increased thickness so that touch-control display dress
Most small size increase can be had by putting 200 thickness after pressure sensor 206 is integrated.Also, by being used as using metal frame
Three conductive layers 106 can also omit the extra electrode with reference voltage, to reduce element cost.
The pressure sensing method of the touch control display apparatus 200 of the present embodiment is as described further below.Please refer to Fig.4 to figure
6, Fig. 4 be the flow chart of the pressure sensing method of the touch control display apparatus of second embodiment of the invention, and Fig. 5 illustrates second embodiment
State of touch control display apparatus when being not yet pressed, Fig. 6 illustrate second embodiment touch control display apparatus it is depressed when
State.As shown in figure 4, the pressure sensing method of the touch control display apparatus of the present embodiment comprises the following steps.First, step is carried out
S10, there is provided touch control display apparatus 200.Since touch control display apparatus 200 is same as the previously described embodiments, seldom repeat.And
And compressible dielectric layer 110 has a first thickness T1 before undeformed, as shown in Figure 5.Then, step S20 is carried out, in pressure
When force snesor 206 is not yet pressed, multiple drive signals are provided respectively to first electrode bar 102S, and respectively from second electrode
Bar 104S receives multiple first capacitance signals, and the 3rd conductive layer 106 is electrically connected to reference voltage.Reference voltage can be such as
For ground voltage or common voltage.Specifically, drive signal is provided to corresponding first electrode bar 102S, each second electricity in proper order
Pole bar 104S has the first coupling capacitance when pressure sensor 206 is not yet pressed between each first electrode bar 102S,
Therefore it can sense drive signal, and then produce the first capacitance signal.Accordingly, each second electrode bar 104S can also feel in proper order
Answer drive signal.Also, second electrode bar 104S can be electrically connected to control chip, to utilize control chip via the first capacitance
The first coupled capacitor when the spacing that signal calculates between the 3rd conductive layer 106 and second electrode article 104S is the first spacing G1
Value.
Then, as shown in fig. 6, carrying out step S30, when an at least position for pressure sensor 206 is pressed, cause to correspond to
The first thickness T1 of the compressible dielectric layer 110 of this position is compressed to a second thickness T2, provides driving respectively again at this time
Signal is to first electrode bar 102S, and the second electrode bar 104S from this corresponding position receives at least one second capacitance signal.Tool
For body, since the thickness reduction of compressible dielectric layer 110 is second thickness T2, the 3rd conductive layer 106 and second electrode article
Spacing between 104S is reduced into the second spacing G2, causes first electrode bar 102S because of part electricity caused by transmission drive signal
Line of force EL can be influenced be subject to the reference voltage of the 3rd conductive layer 106, without being sensed by second electrode bar 104S.Therefore correspondence is pressed
It is to be different from the first capacitance signal to press the second capacitance signal caused by the second electrode bar 104S of position.Can by control chip
When the spacing calculated via the second capacitance signal between the 3rd conductive layer 106 and second electrode article 104S is the second spacing G2
Second coupling capacitance.In this present embodiment, can be to when multiple positions of pressure sensor 206 to the pressing of pressure sensor 206
It is pressed, and control chip can respectively receive multiple second capacitance signals from the second electrode bar 104S of these corresponding positions.
Then, step S40, the first capacitance signal and the second capacitance signal of this relatively more corresponding position, to obtain extremely are carried out
Few pressing force value.An at least coupled capacitor between first conductive layer 102 and the second conductive layer 104 can be relevant at least one pressing
Force value.Specifically, the first capacitance signal of relatively more corresponding each position can be carried out with the second capacitance signal by control chip,
And both differences of each position are calculated, or first obtained from the first capacitance signal is directly calculated by control chip
Coupling capacitance and from the difference between the second coupling capacitance that the second capacitance signal is obtained.Due to the first coupled capacitor
Value and the difference of the second coupling capacitance, i.e. capacitance change, it is electricity to meet the first formula Δ C=ε A Δ D/G1G2, wherein Δ C
Hold knots modification, A is each second electrode article 104S and the 3rd conductive layer 106 in the overlapping area on the Z of upright projection direction, and G1 is tactile
Spacing when control display device 200 is not pressed between the 3rd conductive layer 106 and second electrode article 104S, G2 are touch-control display dress
Put 200 spacing when being pressed between the 3rd conductive layer 106 and second electrode article 104S, Δ D for each second electrode bar 104S with
The knots modification of spacing between 3rd conductive layer 106, i.e. G1-G2, and ε is between each second electrode article 104S and the 3rd conductive layer
Dielectric constant between 106, therefore each second electrode article 104S and can be calculated by the first formula and capacitance change
The knots modification of spacing between three conductive layers 106.In this present embodiment, second electrode article 104S and the 3rd is conductive when being pressed
Backlight module 204 between layer 106 can't produce change, each second electrode article 104S and the 3rd conductive layer 106 on thickness
Between spacing knots modification be compressible dielectric layer 110 second thickness T2 and first thickness T1 difference.Furthermore due to
Pressing force value is to meet the second formula F=κ Δ D, wherein F for pressing force value, and the coefficient of elasticity that κ is compressible dielectric layer 110,
Therefore control chip can obtain pressing force by the difference of the second formula and calculated second thickness T2 and first thickness T1
Value.For example, press force value and the relation of capacitance change can be as shown in Figure 7.It can be preset in touch control display apparatus 200
Different pressing force value scopes, which can correspond to, performs different instructions, therefore touch control display apparatus 200 can be according to the pressing calculated
Force value performs corresponding instruction, and then user performs further instruction by disposable touch.In another
In one embodiment, the coefficient of elasticity κ of compressible dielectric layer 110 can be compensated according to the difference of pressing position using Gaussian curve and
It is different, therefore compare the first capacitance signal and the step of the second capacitance signal and may include to utilize the compressible of this corresponding position
An at least coefficient of elasticity κ for dielectric layer 110, obtains pressing force value.For example, got over apart from the center of touch control display apparatus 200
Near coefficient of elasticity κ is bigger, and the coefficient of elasticity κ nearer apart from the side of touch control display apparatus 200 is smaller.
In this present embodiment, pressure sensor 206 can be pressed by multiple touch objects at the same time, and control chip can be touched from corresponding
The second electrode bar 104S of thing pressing position can receive multiple second capacitance signals respectively, to judge the pressing force of each touch objects
Value.Fig. 8 specifically is refer to, the position that Fig. 8 illustrates coupled capacitor when touch control display apparatus is pressed by two touch objects changes with capacitance
The relation schematic diagram of variable.As shown in figure 8, the size of touch objects is greater than the scope of single coupled capacitor, therefore single touch
Thing is to cover multiple coupled capacitors.When pressure sensor 206 is subject to the pressing of two touch objects, control chip is from corresponding touch objects
The second electrode bar 104S of pressing position receives multiple second capacitance signals respectively, thus can by compare the first capacitance signal with
The step of second capacitance signal, obtains the capacitance change distribution of corresponding diverse location, and then can calculate corresponding diverse location
Pressing force Distribution value.Also, control chip can be obtained from pressing force Distribution value specific location pressing force value relatively around
Force value height (i.e. wave crest) is pressed, to judge touch objects positioned at the higher position of force value and its pressing force value is pressed, further
Perform corresponding instruction.Consequently, it is possible to which touch control display apparatus 200, which can be directed to multiple spot pressing, carries out the instruction to be performed, and take
Touch-control sensing function with touch control display apparatus 200 can allow user to carry out multiple instruction, Jin Erti in a touch action
Rising user can the function quantity that reaches of intuitive.What deserves to be explained is when the position of at least two touch objects is adjoining, to divide
Distinguish whether the touch objects of touch control display apparatus 200 are single or at least two for pressing, and it is big that control chip can calculate capacitance change
The summation of capacitance change in the range of the specific distribution of a minimum value, and judge the summation of capacitance change whether more than one
Particular value, wherein particular value may be, for example, the capacitance change summation of single touch objects.When the summation of capacitance change exceedes this
During particular value, judge that touch control display apparatus 200 is subject at least two touch objects to press.By taking two touch objects as an example, force value is pressed
Had in distribution the pressing force value of two specific locations relatively around pressing force value it is high (i.e. wave crest), therefore control chip can by this two
The position (i.e. trough between two wave crests) between specific location with minimum pressing force value is set as the separation of touch objects, with
The position of two touch objects is distinguished, and then judges the pressing position and pressing force value of each touch objects.Therefore, compared to certainly
For capacity sensor, the mutual capacitance type pressure sensor 206 of the present embodiment can reach the pressing force value detection of multiple spot pressing, and logical
Transmission can not only be reduced with receiving endpoint quantity (the i.e. connection pad number of signal by crossing the detection pressing force value of mutual capacitance type pressure sensor 206
Amount), also it can detect the position distribution of corresponding capacitance change for single touch objects, and then can more accurately detect to touch
Touch the pressing force value of thing.
In conclusion the touch control display apparatus of the present invention is due to being provided with mutual capacitance type pressure sensor therefore can not only have
Touch-control sensing function, can also have the function of pressure-sensing.In addition, since the mutual capacitance type pressure sensor of the present invention not only may be used
The power of single-point pressing, the power of also detectable multiple spot pressing are detected, therefore user can not only hold on touch control display apparatus
The function of row multi-point touch, can also carry out a variety of instructions in a touch action, and then lifts a touch action and can reach
Function quantity.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and it is perfect, therefore the present invention protection model
Enclose to work as and be subject to what claims were defined.
Claims (20)
1. there is the touch control display apparatus of pressure-sensing a kind of, including：
One touch-control display panel, has a display surface relative to each other and a back side；
One backlight module, is arranged on the back side；And
One pressure sensor, including：
One first conductive layer, is arranged between the touch-control display panel and the backlight module；
One second conductive layer, is arranged between first conductive layer and the backlight module；
One insulating layer, is arranged between first conductive layer and second conductive layer；And
One the 3rd conductive layer, the backlight module are arranged between second conductive layer and the 3rd conductive layer, and first conduction
Layer, second conductive layer and the 3rd conductive layer are electrically insulated from.
2. there is the touch control display apparatus of pressure-sensing as claimed in claim 1, separately include a compressible dielectric layer, if
It is placed between second conductive layer and the 3rd conductive layer, which includes air or elastic material.
3. there is the touch control display apparatus of pressure-sensing as claimed in claim 2, it is characterised in that the pressure sensor
To measure at least one pressing force value, and an at least coupled capacitor of first conductive layer and the second conductive interlayer is relevant to this
At least one pressing force value.
4. there is the touch control display apparatus of pressure-sensing as claimed in claim 1, it is characterised in that first conductive layer
Including a plurality of first electrode bar, which includes a plurality of second electrode bar, and a plurality of first electrode bar is a plurality of with this
Second electrode bar interlocks.
5. there is the touch control display apparatus of pressure-sensing as claimed in claim 4, it is characterised in that the respectively second electrode
Bar includes a stripes and multiple extensions, and the plurality of extension extends from least side of the stripes, and respectively this
At least one of the plurality of extension of two electrode strips is overlapping with one of a plurality of first electrode bar.
6. there is the touch control display apparatus of pressure-sensing as claimed in claim 5, it is characterised in that the respectively first electrode
The width of bar is more than the width of the respectively stripes.
7. there is the touch control display apparatus of pressure-sensing as claimed in claim 5, it is characterised in that first conductive layer
Include transparent conductive material respectively with second conductive layer.
8. there is the touch control display apparatus of pressure-sensing as claimed in claim 4, it is characterised in that the respectively first electrode
Bar is driving electrodes, and respectively the second electrode bar is induction electrode.
9. there is the touch control display apparatus of pressure-sensing as claimed in claim 1, it is characterised in that the 3rd conductive layer
For a metal frame, to house the touch-control display panel, the backlight module and the pressure sensor.
10. there is the touch control display apparatus of pressure-sensing as claimed in claim 1, it is characterised in that the insulating layer is
One Optical transparent adhesive, second conductive layer is pasted on first conductive layer.
11. there is the touch control display apparatus of pressure-sensing as claimed in claim 1, it is characterised in that the pressure sensing
Device separately includes an adhesion coating, is arranged between first conductive layer and the touch-control display panel, first conductive layer to be glued
It is affixed on the back side of the touch-control display panel.
12. a kind of mutual capacitance type pressure sensor, including：
One first conductive layer, including a plurality of first electrode bar；
One second conductive layer, including a plurality of second electrode bar, interlock with a plurality of first electrode bar；
One insulating layer, is arranged between first conductive layer and second conductive layer；
One the 3rd conductive layer, wherein second conductive layer are arranged between first conductive layer and the 3rd conductive layer, and this
One conductive layer, second conductive layer and the 3rd conductive layer are electrically insulated from；And
One compressible dielectric layer, is arranged between second conductive layer and the 3rd conductive layer；
Wherein, which can receive multiple capacitance signals respectively, to measure at least one pressing force value, wherein should
An at least coupled capacitor for first conductive layer and the second conductive interlayer is relevant at least one pressing force value.
13. mutual capacitance type pressure sensor as claimed in claim 12, it is characterised in that respectively the second electrode bar includes a strip
Portion and multiple extensions, the plurality of extension extend from least side of the stripes, and respectively the second electrode bar is extremely
The first electrode bar is overlapping with one for few extension.
14. mutual capacitance type pressure sensor as claimed in claim 13, it is characterised in that respectively the width of the first electrode bar is more than
The respectively width of the stripes.
15. mutual capacitance type pressure sensor as claimed in claim 12, it is characterised in that the 3rd conductive layer is plane electricity
Pole, covers first conductive layer and second conductive layer.
16. mutual capacitance type pressure sensor as claimed in claim 12, it is characterised in that the insulating layer is an Optical transparent adhesive,
Second conductive layer is pasted on first conductive layer, and the compressible dielectric layer includes air or elastic material.
17. mutual capacitance type pressure sensor as claimed in claim 12, it is characterised in that according to the plurality of capacitance signal, this is mutual
Appearance formula pressure sensor produces a pressing force Distribution value of corresponding diverse location, so as to realizing multipoint pressure touch-control.
18. a kind of pressure sensing method of touch control display apparatus, including：
The touch control display apparatus is provided, wherein the touch control display apparatus includes：
One touch-control display panel, has a display surface relative to each other and a back side；
One backlight module, is arranged on the back side；And
One pressure sensor, including：
One first conductive layer, is arranged between the touch-control display panel and the backlight module, and first conductive layer is including a plurality of
First electrode bar；
One second conductive layer, is arranged between first conductive layer and the backlight module, and second conductive layer includes a plurality of the
Two electrode strips, interlock with a plurality of first electrode bar；
One insulating layer, is arranged between first conductive layer and second conductive layer；
One the 3rd conductive layer, wherein second conductive layer are arranged between first conductive layer and the 3rd conductive layer, and this
One conductive layer, second conductive layer and the 3rd conductive layer are electrically insulated from；
And
One compressible dielectric layer, is arranged between second conductive layer and the 3rd conductive layer, and the compressible dielectric layer is not in
There is a first thickness before deformation；
When the pressure sensor is not yet pressed, multiple drive signals are provided respectively to a plurality of first electrode bar, and respectively
Multiple first capacitance signals are received from a plurality of second electrode bar, and the 3rd conductive layer is electrically connected to a reference voltage；
When an at least position for the pressure sensor is pressed, cause the of the compressible dielectric layer for corresponding to an at least position
When one thickness reduction is a second thickness, the plurality of drive signal is provided again respectively to a plurality of first electrode bar, and from right
Should at least the one of at least position second electrode bar reception at least one second capacitance signal；And
Compare first capacitance signal and at least one second capacitance signal of a corresponding at least second electrode bar, to obtain
At least one pressing force value.
19. the pressure sensing method of touch control display apparatus as claimed in claim 18, it is characterised in that relatively correspond to this at least
First capacitance signal of one second electrode bar further includes with least one second capacitance signal and obtains an at least capacitance change,
This at least one pressing force value with correspond to same position this at least a capacitance change is proportional.
20. the pressure sensing method of touch control display apparatus as claimed in claim 18, it is characterised in that relatively correspond to this at least
First capacitance signal of one second electrode bar is further included using corresponding to this at least one with least one second capacitance signal
An at least coefficient of elasticity for the compressible dielectric layer put, obtains at least one pressing force value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610882625.4A CN107918502A (en) | 2016-10-10 | 2016-10-10 | Mutual capacitance type pressure sensor and touch control display apparatus and its pressure sensing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610882625.4A CN107918502A (en) | 2016-10-10 | 2016-10-10 | Mutual capacitance type pressure sensor and touch control display apparatus and its pressure sensing method |
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| CN107918502A true CN107918502A (en) | 2018-04-17 |
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Effective date of registration: 20181217 Address after: Taiwan Hsinchu County China jhubei City, Taiwan two yuan Street No. 1 10 floor 1 Applicant after: Ilitek Technology Co., Ltd. Address before: 1/2, 4th floor, 26 Taiyuan Street, Zhubei City, Hsinchu County, Taiwan, China Applicant before: MStar Semiconductor Co., Ltd. |
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Application publication date: 20180417 |