CN101833388B - Touch display and method for determining positions of touch points - Google Patents

Abstract

The invention relates to a touch display and a method for determining positions of touch points. The touch display comprises a fixed body and a deflector, wherein at least three resistance-type angular transducers are arranged between the fixed body and the deflector and generate current variations along with the deflection generated by the touched deflector; the resistance-type angular transducers are connected with a data processing device; the data processing device is used for acquiring position coordinates of the touch points according to the current variations of the resistance-type angular transducers; the fixed body is a backlight source; and the deflector is a display screen. By organically combining material mechanics with principles of electricity, compared with the built-in or external touch displays, the touch display of the invention has the advantages of simple structure, convenient installation, low manufacturing cost and the like, and has wide application prospects.

Description

Touch display and touch point location determining method thereof

Technical field

The present invention relates to a kind of flat-panel monitor, particularly a kind of touch display and touch point location determining method thereof.

Background technology

At present, the touch display of prior art has polytype.Divide according to principle of work, mainly comprise three types of inductance type, condenser type and resistance-types, divide, mainly comprise external and built-in two types according to version.But no matter be external or built-in, its principle of work still is confined to three types of inductance type, condenser type and resistance-types.Resistance-type utilizes pressure sensitive to control, and through two conductive layers is set, two conductive layers contacts in the position, touch point during finger touch, and resistance changes, and obtains the position, touch point by resistance variations.Condenser type utilizes the induction by current of human body, through conductive layer is set, and on four angles, draws four electrodes; When finger touch, because people's bulk electric field, finger and conductive layer form a coupling capacitance; Four electrodes have electric current to change, and are changed obtaining the position, touch point by electric current.

The external touch display is to be superimposed with the touch-screen that is used for perception touch point position coordinates by the display screen that is used to show to process; Not only cause touch display more thick and heavy; And there is the defective of the non-gained that touches easily in the refraction effect that thickness produced that is superimposed upon upper touch-screen, also exists brightness to descend simultaneously or shows defectives such as fuzzy.Built-in touch display is the perception that realizes the touch point position coordinates in the mode of the inner pixel region increase sensing element of display screen; Though solved to a certain extent the external touch display thick and heavy with brightness under the degradation defective; But increased the complexity of display screen inner structure; Increase the difficulty of preparation display screen production technology on the one hand, caused the yield rate reduction on the other hand.

Summary of the invention

The purpose of this invention is to provide a kind of touch display and touch point location determining method thereof, have simple in structure, be convenient to install and advantage such as cost of manufacture is low.

To achieve these goals; The invention provides a kind of touch display; Comprise fixed body and deflecting body; Be provided with between said fixed body and the deflecting body with the deflection that deflecting body produced that is touched and produce at least three resistor type angle sensors that electric current changes, said at least three resistor type angle sensors are connected with data processing equipment, and said data processing equipment is used for changing acquisition touch point position coordinate according to the electric current of said at least three resistor type angle sensors.

Each resistor type angle sensor comprises:

Bracing or strutting arrangement, two ends are connected with deflecting body with fixed body respectively, are used for when deflecting body is touched and produce distortion, and making deflecting body is fulcrum deflection with said bracing or strutting arrangement;

Elastoresistance silk, two ends are connected with deflecting body with fixed body respectively, and the deflection that is used for producing with deflecting body produces elastic deformation;

Current collecting device is connected with said elastoresistance silk, is used to gather the electric current variation that the elastoresistance silk produces the elastic deformation front and back, and said electric current variation is sent to said data processing equipment.

Said resistor type angle sensor is three or four, is separately positioned on the bight of said deflecting body.

Said fixed body is a backlight.Said deflecting body is a display screen, and said display screen and said backlight laterally arrange, and the distance between display screen and the said backlight is greater than 4mm.

On the technique scheme basis, said data processing equipment comprises:

The deflection processing module is connected with each current collecting device, is used for producing the deflection angle of the electric current variation acquisition deflecting body of elastic deformation front and back in each elastoresistance silk position according to each elastoresistance silk;

The position processing module is connected with said deflection processing module, is used for obtaining the touch point position coordinate according to the deflection angle of deflecting body in each elastoresistance silk position.

Said deflection is handled mould and is comprised:

The deformation process unit is connected with each current collecting device, is used for producing according to each elastoresistance silk the deflection of each elastoresistance silk of electric current variation acquisition of elastic deformation front and back;

The deflection processing unit is connected with said deformation process unit, is used for obtaining the deflection angle of deflecting body in each elastoresistance silk position according to the deflection of each elastoresistance silk.

To achieve these goals, the invention provides a kind of touch display touch point location determining method, comprising:

Step 1, the deflecting body that is touched produce deflection, and at least three resistor type angle sensors that are connected with said deflecting body produce electric current with said deflection to be changed;

Step 2, the electric current variation of gathering said at least three resistor type angle sensors;

Step 3, change according to the electric current of said at least three resistor type angle sensors and to obtain the touch point position coordinate.

Said step 3 comprises:

Step 31, change according to the electric current of said at least three resistor type angle sensors and to obtain the deflection angle of deflecting body in each resistor type angle sensor position;

Step 32, obtain the touch point position coordinate in the deflection angle of each resistor type angle sensor position according to deflecting body.

Said step 31 comprises:

Step 311, change the deflection that obtains elasticity resistance wire in each resistor type angle sensor at least according to the electric current of said three resistor type angle sensors;

Step 312, obtain the deflection angle of deflecting body in each elastoresistance silk position according to the deflection of each elastoresistance silk.

The invention provides a kind of touch display and touch point location determining method thereof, the mechanics of materials and electrical principles organically combined, have simple in structure, be convenient to install and advantage such as cost of manufacture is low.Compare with prior art external touch display, the present invention does not only increase the weight and the thickness of display, and brightness decline can not occur or show defectives such as fuzzy.Compare with the built-in touch display of prior art; The present invention can be applicable to the display screen of various mode of operations widely; Need not change the inner structure of display screen; Therefore can not increase the complexity of display screen structure, can not increase the step and the difficulty of preparation display screen production technology, can not cause yield rate to reduce yet.Further, the present invention is simple in structure, and version is irrelevant with the size of display screen basically; The assembling mode of structure mounting means of the present invention and prior art display screen is close, is convenient to install and use; Prior, structure member cost of the present invention is low, and reliability is high, has greatly reduced the cost of manufacturing of touch display, is with a wide range of applications.

Description of drawings

Fig. 1 is the structural representation of touch display first embodiment of the present invention;

Fig. 2 is the side view of Fig. 1;

Fig. 3 a is the structural representation of touch display bracing or strutting arrangement connected mode of the present invention;

Fig. 3 b is the structural representation of the another kind of connected mode of touch display bracing or strutting arrangement of the present invention;

Fig. 4 is the fundamental diagram of resistor type angle sensor of the present invention;

Fig. 5 is the synoptic diagram of display screen deflection of the present invention;

Fig. 6 is the synoptic diagram before the display screen deflection of the present invention;

Fig. 7 is the synoptic diagram after the display screen deflection of the present invention;

Fig. 8 is the structural representation of touch display second embodiment of the present invention;

Fig. 9 is the structural representation of data processing equipment of the present invention;

Figure 10 is the process flow diagram of touch display of the present invention touch point location determining method.

Description of reference numerals:

The 1-display screen; The 2-backlight; The 3-bracing or strutting arrangement;

4-elastoresistance silk; 31-first bracing or strutting arrangement; 32-second bracing or strutting arrangement;

The 41-first elastoresistance silk; The 42-second elastoresistance silk; 51-deflection processing module;

52-position processing module; 53-deformation process unit; 54-deflection processing unit;

The 301-supporting seat; The 302-support bar.

Embodiment

Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.

Fig. 1 is the structural representation of touch display first embodiment of the present invention, and Fig. 2 is the side view of Fig. 1.As depicted in figs. 1 and 2; The agent structure of present embodiment touch display comprises display screen 1, backlight 2, three resistor type angle sensors and data processing equipments (data processing equipment is not shown); Display screen 1 is used for display frame; Backlight 2 is used to provide light source, and three resistor type angle sensors are arranged on and are parallel to each other and at interval between the display screen 1 and backlight 2 of a setpoint distance, are same as the deflection that is produced according to the display screen 1 that is touched and produce the electric current variation; Data processing equipment is connected with three resistor type angle sensors, is used for changing definite touch point position coordinate according to the electric current of three resistor type angle sensors.In order not influence the normal demonstration of display screen 1, three resistor type angle sensors of present embodiment can be arranged on any position at display screen 1 edge, are scattered distribution, with distance principle more greatly each other.Preferably, present embodiment is arranged on three resistor type angle sensors three folding corner regions of display screen 1: bight A, bight B and bight D.Particularly; Each resistor type angle sensor of present embodiment comprises bracing or strutting arrangement 3, elastoresistance silk 4 and current collecting device (current collecting device is not shown); The two ends of bracing or strutting arrangement 3 are connected with backlight 2 with display screen 1 respectively; Be used for when display screen 1 is touched and produce distortion, making display screen 1 is fulcrum deflection with bracing or strutting arrangement 3; Elastoresistance silk 4 is arranged on the outside of bracing or strutting arrangement 3, and two ends are connected with backlight 2 with display screen 1 respectively, and the deflection that is used for being produced with display screen 1 produces elastic deformation; Current collecting device is connected with elastoresistance silk 4, is used to gather the electric current variation that elastoresistance silk 4 produces the elastic deformation front and back, and this electric current variation is sent to data processing equipment.Current collecting device in three resistor type angle sensors of present embodiment both can be provided with separately, also can be merged into one.Merging is that the elastoresistance silk 4 in three resistor type angle sensors all is connected with a current collecting device.

In the practical application, the specification of spacing and display screen is relevant between display screen and the backlight, and screen size is big more, and spacing is big more between display screen and the backlight.With 17 inches display screens is example, and spacing＞4mm gets final product between display screen and the backlight.Spacing is the bigger the better under the prerequisite that does not influence assembling between bracing or strutting arrangement and the elastoresistance silk, is example with 17 inches display screens, and spacing＞0.2mm gets final product between bracing or strutting arrangement and the elastoresistance silk.

Fig. 3 a is the structural representation of touch display bracing or strutting arrangement connected mode of the present invention.Shown in Fig. 3 a; Bracing or strutting arrangement comprises hinged supporting seat 301 and support bar 302; The upper end of supporting seat 301 is fixed on the lower surface of display screen 1, and the lower end of supporting seat 301 is a concave ball shape, and the lower end of support bar 302 is fixed on the upper surface of backlight 2; The upper end of support bar 302 is protruding sphere, and the lower end of the upper end of support bar 302 protruding spheries and supporting seat 301 concave ball shapes constitutes hinge engaging structure.In the practical application, display screen 1 receives the bracing or strutting arrangement constraint on the one hand, on the other hand, can be to change heart deflection with the bracing or strutting arrangement.Fig. 3 b is the structural representation of the another kind of connected mode of touch display bracing or strutting arrangement of the present invention.Shown in Fig. 3 b; Bracing or strutting arrangement comprises following bracing or strutting arrangement that is positioned at display screen 1 lower surface and the last bracing or strutting arrangement that is positioned at display screen 1 upper surface; Last bracing or strutting arrangement is identical with following support device structure form, includes hinged supporting seat 301 and support bar 302, in the hinged place; The end of supporting seat 301 is an arcs of recesses, and the end of support bar 302 is a convex.In the practical application, last bracing or strutting arrangement can be fixed on the framed structure.

Further specify the technical scheme of present embodiment below through the principle of work of present embodiment touch display.The brief account principle of work of resistor type angle sensor once at first.

Fig. 4 is the fundamental diagram of resistor type angle sensor of the present invention.As shown in Figure 4, to suppose the elastoresistance silk 4 that ability is freely stretched in regime of elastic deformation is installed between deflecting body P with angle theta and fixed body Q, elastoresistance silk 4 two ends add constant voltage, and connect reometer.When deflecting body P serves as to change heart deflection to make the angle between deflecting body P and the fixed body Q change to θ ' time from θ with the O point, the length of elastoresistance silk 4 is elongated, reduced.Because length increases, reduced, cause the resistance of elastoresistance silk 4 to increase, and then cause reducing through the electric current of elastoresistance silk.Just can know the deflection of elastoresistance silk 4 through measuring elastoresistance silk 4 electric currents; And then just can know that deflecting body P deflection retrodeviates the angle θ ' that turns between P and the fixed body Q, promptly there is the funtcional relationship I=f (θ ') between the angle θ ' after electric current I and the deflection.Certainly, concrete relational expression is relevant with the factors such as material, length, diameter and temperature of elastoresistance silk.

Touch display of the present invention is according to above-mentioned material mechanics and electrical principles; At least three bracing or strutting arrangements as fulcrum are set between display screen and backlight; The elastoresistance silk also is arranged between display screen and the backlight; And be positioned at the outer survey of each bracing or strutting arrangement, obtain the deflection angle of display screen through the position relation of the electric current variation in the elastoresistance silk, bracing or strutting arrangement and elastoresistance silk.

Fig. 5 is the synoptic diagram of display screen deflection of the present invention, is example with first resistor type angle sensor of A setting in bight among Fig. 1 and the second resistor type angle sensor of bight B setting.As shown in Figure 5; First bracing or strutting arrangement 31 of the first resistor type angle sensor and second bracing or strutting arrangement 32 of the second resistor type angle sensor are fixed on the backlight 2; 1 of display screen is connected on first bracing or strutting arrangement 31 and second bracing or strutting arrangement 32; Display screen 1 is divided into three parts: the T1 of first is positioned at the outside of first bracing or strutting arrangement 31; Second portion T2 is positioned at the outside of second bracing or strutting arrangement 32, and third part T3 forms a kind of force structure form of overhanging beam between first bracing or strutting arrangement 31 and second bracing or strutting arrangement 32.When the some positions on the third part T3 of display screen 1 receive when touching; Touching the external force F that produces causes the third part T3 of display screen 1 to deform; Because the fixed constraint of display screen 1 and first bracing or strutting arrangement 31 and second bracing or strutting arrangement 32, display screen 1 be deformed into third part T3 downwarping, T1 of first and second portion T2 are upturned; Be the T1 of first with the tie point of first bracing or strutting arrangement 31 serve as to change the mind-set upper deflecting; Second portion T2 serves as to change the mind-set upper deflecting with the tie point of second bracing or strutting arrangement 32, makes the T1 of first of display screen 1 have first angle of deflection, and the second portion T2 of display screen 1 has the second deflection angle β.Because the first elastoresistance silk 41 of the first resistor type angle sensor is arranged on the first T1 position of display screen 1; The second elastoresistance silk 42 of the second resistor type angle sensor is arranged on the second portion T2 of display screen 1; And the first elastoresistance silk 41 is connected with backlight 2 with the second elastoresistance silk 42; Therefore T1 of first and being upturned of second portion T2 cause the first elastoresistance silk 41 and the second elastoresistance silk 42 to deform; Electric current variation through measuring the first elastoresistance silk 41 and the second elastoresistance silk 42 respectively just can be known its deflection, and then just can know first angle of deflection of display screen 1 T1 of first and the second deflection angle β of display screen 1 second portion T2.

Put aside the distortional stress of elastoresistance silk, display screen be reduced to simple mechanics models,, can obtain the touch point position function then according to geometric configuration shown in Figure 5 and material mechanics principle:

$X=D\frac{\mathrm{tg\β}-\sin \mathrm{\β}}{\mathrm{tg\α}-\sin \mathrm{\α}+\mathrm{tg\β}-\sin \mathrm{\β}}---\left(1\right)$

In the formula; X is the distance of touch point apart from first bracing or strutting arrangement 31; D is the distance between first bracing or strutting arrangement 31 and second bracing or strutting arrangement 32; α is first deflection angle of display screen in first bracing or strutting arrangement, 31 outsides (first of display screen), and β is second deflection angle of display screen in second bracing or strutting arrangement, 32 outsides (second portion of display screen).

When considering the distortional stress of elastoresistance silk, according to Hooke's law, this distortional stress is:

$\mathrm{\σ}=\mathrm{E\ϵ}=E\frac{\mathrm{\ΔL}}{L}=E\frac{m\sin \mathrm{\θ}}{L}$

In the formula; σ is the distortional stress of elastoresistance silk, and E is the Young's modulus of elasticity of elastoresistance silk, and ε is the deflection of elastoresistance silk; L is the drift (length before the distortion) of elastoresistance silk; Δ L is the deflection of elastoresistance silk, m be the elastoresistance silk with corresponding bracing or strutting arrangement between distance, θ is the deflection angle of display screen in elastoresistance silk position.

Because the deflection angle that display screen produces when being touched is less, θ＜5 °, so think and also be perpendicular to fixed body after the elastoresistance filate becomes, so sin θ ≈ θ, following formula can be reduced to:

$\mathrm{\σ}=E\frac{\mathrm{m\θ}}{L}---\left(2\right)$

Equate principle by volume before and after the elastoresistance silk elastic deformation, so the cross-sectional area behind the elastoresistance deformation of filament is: $S^{\&prime;}=\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="H2009100799494E00011.png,H2009100799494E00012.png"\; state="\{\{state\}\}">S</figure-callout>}\frac{1}{1+\frac{\mathrm{\&sigma;}}{E}},$ In the formula, S ' is the cross-sectional area behind the elastoresistance deformation of filament, and S is the free cross-sectional area (cross-sectional area before the distortion) of elastoresistance silk.

If apply constant voltage V at elastoresistance silk two ends, then according to Ohm law and resistance calculations formula, the electric current that passes through in the elastoresistance silk of distortion back is:

$I^{\&prime;}=\frac{V}{R^{\&prime;}}=\frac{V}{\mathrm{\&rho;}\frac{L(1+\frac{\mathrm{\&sigma;}}{E})}{\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="H2009100799494E00011.png,H2009100799494E00012.png"\; state="\{\{state\}\}">S</figure-callout>}\frac{1}{1+\frac{\mathrm{\&sigma;}}{E}}}}=\frac{V}{\mathrm{\&rho;}\frac{L{(1+\frac{\mathrm{\&sigma;}}{E})}^2}{S}}=\frac{V}{R{(1+\frac{\mathrm{\&sigma;}}{E})}^2}=\frac{I}{{(1+\frac{\mathrm{\&sigma;}}{E})}^2}---\left(3\right)$

In the formula, the electric current of I ' for passing through behind the elastoresistance deformation of filament, I is the electric current that passes through before the elastoresistance deformation of filament.With formula (2) substitution formula (3), have:

$\mathrm{\&theta;}=\frac{L(\sqrt{\frac{I}{I^{\&prime;}}}-1)}{m}---\left(4\right)$

In a dimension coordinate; Bring the parameter of the last first resistor type angle sensor of bight A into formula (4) and can obtain first angle of deflection; Bring the parameter of the last second resistor type angle sensor of bight B into formula (4) and can obtain the second deflection angle β; With first angle of deflection and the second deflection angle β substitution formula (1) that through type (4) obtains, can draw the funtcional relationship between the touch point position X on elastoresistance silk electric current variation (electric current I and electric current I ') and the AB line.

In conjunction with present embodiment, as shown in Figure 1, three resistor type angle sensors of present embodiment are separately positioned on three folding corner regions of display screen 1; The first resistor type angle sensor is arranged on bight A; The second resistor type angle sensor is arranged on bight B, and the 3rd resistor type angle sensor is arranged on bight D, supposes that the deflection angle of A place, bight display screen is α; The deflection angle of B place, bight display screen is β, and the deflection angle of bight D place display screen is δ.Fig. 6 is for the synoptic diagram before the display screen deflection of the present invention, for A place, display screen shown in Figure 1 bight is provided with the first resistor type angle sensor situation of (comprising first bracing or strutting arrangement and the first elastoresistance silk).As shown in Figure 6, and combine Fig. 1, in the three-dimensional coordinate system that constitutes by XYZ; Initial point O is arranged on the first bracing or strutting arrangement position; X axle positive dirction arrives bight A direction for bight B, and Y axle positive dirction arrives bight A direction for bight D, and Z axle positive dirction is the normal direction of display screen.In initial designs; Position relation between the first elastoresistance silk 41 and first bracing or strutting arrangement 31 is predetermined; Suppose that first bracing or strutting arrangement 31 and the link position of display screen 1 are initial point O; The first elastoresistance silk 41 is A with the link position of display screen 1; The distance of line OA is m between the first elastoresistance silk 41 and first bracing or strutting arrangement 31, and the angle of line OA and Y axle is a between the first elastoresistance silk 41 and first bracing or strutting arrangement 31, and this position relation also is the position relation of display screen when not being touched (being that display screen is not out of shape).Fig. 7 is the synoptic diagram after the display screen deflection of the present invention.As shown in Figure 7, when display screen was touched, display screen produced distortion; The A position serves as to change the deflection of mind-set Z-direction with initial point O, makes the A location deflection to A ' position, and deflection angle is θ; Obviously, OE is the projection of OA ' in XOY plane, with the angle of Y axle be a; Correspondingly, OF and OG are respectively the projection of OA ' in XOZ plane and YOZ plane, and angle theta _xAnd angle theta _yBe respectively the projected angle of deflection angle theta in XOZ plane and YOZ plane.

According to solid geometry principle and trigonometric function relation, have

OE＝mcosθ， A′E＝FJ＝GH＝msinθ

OH＝mcosθcosa，?OJ＝mcosθsina

Angle theta then _xAnd angle theta _yBe respectively:

${\mathrm{\&theta;}}_x=\mathrm{arctg}\frac{m\sin \mathrm{\&theta;}}{m\cos \mathrm{\&theta;}\sin a}=\mathrm{arctg}\frac{\sin \mathrm{\&theta;}}{\cos \mathrm{\&theta;}\sin a}=\mathrm{arctg}\frac{\mathrm{tg\&theta;}}{\sin a}---\left(5\right)$

${\mathrm{\&theta;}}_y=\mathrm{arctg}\frac{m\sin \mathrm{\&theta;}}{m\cos \mathrm{\&theta;}\cos a}=\mathrm{arctg}\frac{\sin \mathrm{\&theta;}}{\cos \mathrm{\&theta;}\cos a}=\mathrm{arctg}\frac{\mathrm{tg\&theta;}}{\cos a}---\left(6\right)$

Adopting above-mentioned analysis result, is analytic target with bight A and bight B, can obtain the projected position of touch point on the AB line, and promptly the subpoint of touch point on the AB line is apart from the distance X of bight A place first bracing or strutting arrangement _AB, X _ABFor:

$X_{\mathrm{AB}}=D_X\frac{\mathrm{tg}{\mathrm{\&beta;}}_x-{\sin \mathrm{\&beta;}}_x}{\mathrm{tg}{\mathrm{\&alpha;}}_x-\sin {\mathrm{\&alpha;}}_x+\mathrm{tg}{\mathrm{\&beta;}}_x-{\sin \mathrm{\&beta;}}_x}=D_X\frac{\mathrm{tg}\left(\mathrm{arctg}\frac{\mathrm{tg\&beta;}}{\sin a}\right)-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&beta;}}{\sin a}\right)}{\mathrm{tg}\left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\sin a}\right)-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\sin a}\right)+\mathrm{tg}\left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\sin a}\right)-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&beta;}}{\sin a}\right)}$

$=D_X\frac{\frac{\mathrm{tg\&beta;}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&beta;}}{\sin a}\right)}{\frac{\mathrm{tg\&alpha;}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\sin a}\right)+\frac{\mathrm{tg\&beta;}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&beta;}}{\sin a}\right)}$

$=D_X\frac{\frac{\mathrm{tg}\frac{L_B(\sqrt{\frac{I_B}{{I^{\&prime;}}_B}}-1)}{m}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_B(\sqrt{\frac{I_B}{{I^{\&prime;}}_B}}-1)}{m}}{\sin a}\right)}{\frac{\mathrm{tg}\frac{L_A(\sqrt{\frac{I_A}{{I^{\&prime;}}_A}}-1)}{m}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_A(\sqrt{\frac{I_A}{{I^{\&prime;}}_A}}-1)}{m}}{\sin a}\right)+\frac{\mathrm{tg}\frac{L_B(\sqrt{\frac{I_B}{{I^{\&prime;}}_B}}-1)}{m}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_B(\sqrt{\frac{I_B}{{I^{\&prime;}}_B}}-1)}{m}}{\sin a}\right)}---\left(7\right)$

In the formula, Dx is the distance of AB line, α _xBe the projected angle of first angle of deflection in the XOZ plane of bight A place display screen, β _xBe the projected angle of the second deflection angle β in the XOZ plane of bight B place display screen, L _ABe the drift (length before the distortion) of the bight A place first elastoresistance silk, L _BBe the drift of the bight B place second elastoresistance silk, I _ABe the electric current that passes through before the bight A place first elastoresistance deformation of filament, I ' _ABe the electric current that passes through behind the bight A place first elastoresistance deformation of filament, I _BBe the electric current that passes through before the bight B place second elastoresistance deformation of filament, I ' _BBe the electric current that passes through behind the bight B place second elastoresistance deformation of filament, m is the distance between the bight A place first elastoresistance silk and first bracing or strutting arrangement.

Adopting same analytical approach, is analytic target with bight A and bight D, can obtain the projected position of touch point on the AD line, and promptly the subpoint of touch point on the AD line is apart from the distance Y of bight A place first bracing or strutting arrangement _AD, Y _ADFor:

$Y_{\mathrm{AD}}=D_Y\frac{\mathrm{tg}{\mathrm{\&delta;}}_y-{\sin \mathrm{\&delta;}}_y}{\mathrm{tg}{\mathrm{\&alpha;}}_y-\sin {\mathrm{\&alpha;}}_y+\mathrm{tg}{\mathrm{\&delta;}}_y-{\sin \mathrm{\&delta;}}_y}=D_Y\frac{\mathrm{tg}\left(\mathrm{arctg}\frac{\mathrm{tg\&delta;}}{\cos a}\right)-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&delta;}}{\cos a}\right)}{\mathrm{tg}\left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\cos a}\right)-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\cos a}\right)+\mathrm{tg}\left(\mathrm{arctg}\frac{\mathrm{tg\&delta;}}{\cos a}\right)-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&delta;}}{\cos a}\right)}$

$=D_Y\frac{\frac{\mathrm{tg\&delta;}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&delta;}}{\cos a}\right)}{\frac{\mathrm{tg\&alpha;}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&alpha;}}{\cos a}\right)+\frac{\mathrm{tg\&delta;}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg\&delta;}}{\cos a}\right)}$

$=D_Y\frac{\frac{\mathrm{tg}\frac{L_D(\sqrt{\frac{I_D}{{I^{\&prime;}}_D}}-1)}{m}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_D(\sqrt{\frac{I_D}{{I^{\&prime;}}_D}}-1)}{m}}{\cos a}\right)}{\frac{\mathrm{tg}\frac{L_A(\sqrt{\frac{I_A}{{I^{\&prime;}}_A}}-1)}{m}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_A(\sqrt{\frac{I_A}{{I^{\&prime;}}_A}}-1)}{m}}{\cos a}\right)+\frac{\mathrm{tg}\frac{L_D(\sqrt{\frac{I_D}{{I^{\&prime;}}_D}}-1)}{m}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_D(\sqrt{\frac{I_D}{{I^{\&prime;}}_D}}-1)}{m}}{\cos a}\right)}---\left(8\right)$

In the formula, Dy is the distance of AD line, α _yBe the projected angle of first angle of deflection in the YOZ plane of bight A place display screen, δ _yBe the projected angle of the 3rd deflection angle δ in the YOZ plane of bight D place display screen, L _ABe the drift (length before the distortion) of the bight A place first elastoresistance silk, L _DBe the drift of bight D place the 3rd elastoresistance silk, I _ABe the electric current that passes through before the bight A place first elastoresistance deformation of filament, I ' _ABe the electric current that passes through behind the bight A place first elastoresistance deformation of filament, I _DBe the electric current that passes through before bight D place the 3rd elastoresistance deformation of filament, I ' _DBe the electric current that passes through behind bight D place the 3rd elastoresistance deformation of filament, m is the distance between the bight A place first elastoresistance silk and first bracing or strutting arrangement.

The X that obtains thus _ABAnd Y _ADBe the coordinate of touch point, this coordinate is true origin O for first bracing or strutting arrangement with bight A place, horizontal ordinate X _ABBe the distance of touch point between subpoint on the AB line and true origin O (first bracing or strutting arrangement at bight A place), ordinate Y _ADBe the distance of touch point between subpoint on the AD line and true origin O (first bracing or strutting arrangement at bight A place), this horizontal ordinate and ordinate are the relation between variation of elastoresistance silk electric current and the position, touch point.

Fig. 8 is the touch display second example structure synoptic diagram of the present invention.As shown in Figure 8; The present embodiment touch display is a kind of scheme expansion of aforementioned first embodiment; Agent structure comprises display screen 1, backlight 2, four angular transducers and data processing equipments (data processing equipment is not shown); Structure, effect and the principle of work of present embodiment display screen, backlight, data processing equipment and resistor type angle sensor is identical with aforementioned first embodiment; Different is; Present embodiment is arranged on four resistor type angle sensors four folding corner regions of display screen 1: A place in bight is provided with that the first resistor type angle sensor, bight B place are provided with the second resistor type angle sensor, the 3rd resistor type angle sensor is set at bight C place and D place in bight is provided with the 4th resistor type angle sensor, not only can obtain the distance X of the subpoint of touch point on the AB line apart from bight A place first bracing or strutting arrangement through the resistor type angle sensor of bight A and bight B _AB, the resistor type angle sensor through bight A and bight D obtains the distance Y of the subpoint of touch point on the AD line apart from bight A place first bracing or strutting arrangement _AD, can also obtain the distance X of the subpoint of touch point on the CD line through the resistor type angle sensor of bight C and bight D apart from bight D place the 4th bracing or strutting arrangement _DC, the resistor type angle sensor through bight B and bight C obtains the distance Y of the subpoint of touch point on the BC line apart from bight B place second bracing or strutting arrangement _BC

Adopting the analytical approach of first embodiment, is analytic target with bight C and bight D, can obtain the projected position of touch point on the CD line, and promptly the subpoint of touch point on the CD line is apart from the distance X of bight D place the 4th bracing or strutting arrangement _DC, X _DCFor:

$X_{\mathrm{DC}}=D_X\frac{\frac{\mathrm{tg}\frac{L_C(\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1)}{m}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_C(\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1)}{m}}{\sin a}\right)}{\frac{\mathrm{tg}\frac{L_D(\sqrt{\frac{I_D}{{I^{\&prime;}}_D}}-1)}{m}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_D(\sqrt{\frac{I_D}{{I^{\&prime;}}_D}}-1)}{m}}{\sin a}\right)+\frac{\mathrm{tg}\frac{L_C(\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1)}{m}}{\sin a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_C(\sqrt{\frac{I_c}{{I^{\&prime;}}_C}}-1)}{m}}{\sin a}\right)}---\left(9\right)$

In the formula, Dx is the distance of CD line, L _CBe the drift of bight C place the 3rd elastoresistance silk, I _CBe the electric current that passes through before bight C place the 3rd elastoresistance deformation of filament, I ' _CBe the electric current that passes through behind bight C place the 3rd elastoresistance deformation of filament, L _DBe the drift of bight D place the 4th elastoresistance silk, I _DBe the electric current that passes through before bight D place the 4th elastoresistance deformation of filament, I ' _DBe the electric current that passes through behind bight D place the 4th elastoresistance deformation of filament, m is the distance between bight D place the 4th elastoresistance silk and the 4th bracing or strutting arrangement.

Adopting the analytical approach of first embodiment, is analytic target with bight B and bight C, can obtain the projected position of touch point on the BC line, and promptly the subpoint of touch point on the BC line is apart from the distance Y of bight B place second bracing or strutting arrangement _BC, Y _BCFor:

$Y_{\mathrm{BC}}=D_{\text{Y}}\frac{\frac{\mathrm{tg}\frac{L_C\left(\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1\right)}{m}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_C(\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1)}{m}}{\cos a}\right)}{\frac{\mathrm{tg}\frac{L_B(\sqrt{\frac{I_B}{{I^{\&prime;}}_B}}-1)}{m}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_B(\sqrt{\frac{I_B}{{I^{\&prime;}}_B}}-1)}{m}}{\cos a}\right)+\frac{\mathrm{tg}\frac{L_C(\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1)}{m}}{\cos a}-\sin \left(\mathrm{arctg}\frac{\mathrm{tg}\frac{L_C\sqrt{\frac{I_C}{{I^{\&prime;}}_C}}-1}{m}}{\cos a}\right)}---\left(10\right)$

In the formula, Dy is the distance of BC line, L _BBe the drift of the bight B place second elastoresistance silk, I _BBe the electric current that passes through before the bight B place second elastoresistance deformation of filament, I ' _BBe the electric current that passes through behind the bight B place second elastoresistance deformation of filament, L _CBe the drift of bight C place the 3rd elastoresistance silk, I _CBe the electric current that passes through before bight C place the 3rd elastoresistance deformation of filament, I ' _CBe the electric current that passes through behind bight C place the 3rd elastoresistance deformation of filament, m is the distance between the bight B place second elastoresistance silk and second bracing or strutting arrangement.

In order to reduce error, can be with X _ABWith X _DCMean value as the horizontal ordinate of touch point, with Y _ADWith Y _BCMean value as the ordinate of touch point, therefore, have

$\stackrel{\&OverBar;}{X}=\frac{X_{\mathrm{AB}}+X_{\mathrm{DC}}}{2}$ $\stackrel{\&OverBar;}{Y}=\frac{Y_{\mathrm{AD}}+{\mathrm{<figure-callout\; id="2"\; label="Y\; BC"\; filenames="H2009100799494E00011.png,H2009100799494E00012.png"\; state="\{\{state\}\}">Y</figure-callout>}}_{\mathrm{BC}}}{2}$

In the formula, X and Y are respectively the average horizontal ordinate and the mean ordinate of touch point, and this horizontal ordinate and ordinate are the electric current variation of elastoresistance silk and the relation between the position, touch point.

Need to prove that aforementioned two embodiment of the present invention are a kind of schematic illustration, on the basis of previous embodiment, the present invention also exists many-side, multi-level expansion scheme.For the quantity and the layout of resistor type angle sensor, the resistor type angle sensor more than three can adopt the layout of combination in any.For example, three resistor type angle sensors adopt the isosceles triangle layout, and promptly two resistor type angle sensors are arranged on adjacent bight, and another one resistor type angle sensor is arranged on the middle part of opposite side.And for example, three resistor type angle sensors adopt the equilateral triangle layout.For another example, four resistor type angle sensors adopt the rhombus layouts, and promptly four resistor type angle sensors are separately positioned on the middle part at edge.When the quantity of resistor type angle sensor during, can adopt several different methods to obtain the coordinate of touch point according to the arrangement mode of resistor type angle sensor greater than 4.For arrangement mode, can 4 resistor type angle sensors be arranged on four bights, other resistor type angle sensor is arranged on the middle part, edge in couples.For the method that obtains the touch point coordinate, a kind of method is made even all in X-direction and Y direction respectively after can the maximum deflection angle at each resistor type angle sensor place being decomposed, and the method with reference to previous embodiment obtains the touch point coordinate then; It is some right that another kind method can be divided into the resistor type angle sensor, obtains the touch point coordinate of every pair of correspondence respectively, adopts similar method of averaging to obtain the average coordinates of touch point then.Obviously, the quantity that the resistor type angle sensor is set is many more, and computation process is more complicated, but the precision of touch point coordinate is high more.

Fig. 9 is the structural representation of data processing equipment of the present invention.As shown in Figure 9; Data processing equipment of the present invention comprises deflection processing module 51 and position processing module 52; Deflection processing module 51 is connected with current collecting device in each resistor type angle sensor; Be used for producing the deflection angle of the electric current variation acquisition display screen of elastic deformation front and back in each elastoresistance silk position according to each elastoresistance silk; Position processing module 52 is connected with deflection processing module 51, is used for obtaining the touch point position coordinate according to the deflection angle of display screen in each elastoresistance silk position.Particularly; Deflection processing module 51 comprises deformation process unit 53 and deflection processing unit 54; Deformation process unit 53 is connected with current collecting device in each resistor type angle sensor; Be used for producing according to each elastoresistance silk the deflection of each elastoresistance silk of electric current variation acquisition of elastic deformation front and back, deflection processing unit 54 is connected with deformation process unit 53, is used for obtaining the deflection angle of display screen in each elastoresistance silk position according to the deflection of each elastoresistance silk.The course of work of data processing equipment of the present invention is specially: at first gather the electric current that passes through in the elastoresistance silk and change (current value after comprising the preceding current value of distortion and being out of shape); Electric current according to the elastoresistance silk changes the deflection that obtains the elastoresistance silk then; Deflection according to the elastoresistance silk obtains the deflection angle of display screen in elastoresistance silk position, according to the deflection angle acquisition touch point position coordinate of display screen.We can say that also data processing equipment of the present invention obtains the touch point position coordinate according to the electric current variation of elastoresistance silk and the relation between the position, touch point.After obtaining the touch point position coordinate, data processing equipment feeds back to operating system with the touch point position coordinate, realizes the demonstration control of touch display.In addition; Consider the uncertain factor in the processing and manufacturing process; Plastic yield during for example the site error of bracing or strutting arrangement or elastoresistance silk, elastoresistance silk use, environment for use variation etc.; The electric current variation of elastoresistance silk of the present invention and the relation between the position, touch point can be set corresponding correction factor as the case may be, repeat no more here.

In the above embodiment of the present invention; Backlight is as a kind of form of fixed body of the present invention; Display screen is as a kind of form of deflecting body of the present invention, and it is a kind of preferred version that resistor type angle sensor of the present invention is arranged between display screen and the backlight, can make full use of the mounting structure of prior art display screen and backlight; For example, can present embodiment resistor type angle sensor be arranged on the housing of backlight or backlight.In the practical application, can adopt corresponding structure to replace backlight and display screen.For example,, can adopt fixed body forms such as fixed head or fixed support, to guarantee the fixing of bracing or strutting arrangement and elastoresistance silk for the display screen that does not need backlight.And for example, also can not utilize display screen as deflecting body, but on display screen additional transparency carrier, the distortion through this transparency carrier obtains the touch point position coordinate.In addition, the outside that the elastoresistance silk in the resistor type angle sensor is arranged on bracing or strutting arrangement also is a kind of preferred version, under the prerequisite that does not influence demonstration; Elastoresistance silk in the resistor type angle sensor of the present invention also can be arranged on the inboard of bracing or strutting arrangement, correspondingly, and the stressed pressure that becomes of elastoresistance silk; The length of elastoresistance silk shortens; Diameter increases, and causes the resistance of elastoresistance silk to reduce, and then causes increasing through the electric current of elastoresistance silk.

The invention provides a kind of touch display, the mechanics of materials and electrical principles organically combined, have simple in structure, be convenient to install and advantage such as cost of manufacture is low.Compare with prior art external touch display, the present invention does not only increase the weight and the thickness of display, and brightness decline can not occur or show defectives such as fuzzy.Compare with the built-in touch display of prior art; The present invention can be applicable to the display screen of various mode of operations widely; Need not change the inner structure of display screen; Therefore can not increase the complexity of display screen structure, can not increase the step and the difficulty of preparation display screen production technology, can not cause yield rate to reduce yet.Further, the present invention is simple in structure, and version is irrelevant with the size of display screen basically; The assembling mode of structure mounting means of the present invention and prior art display screen is close, is convenient to install and use; Prior, structure member cost of the present invention is low, and reliability is high, has greatly reduced the cost of manufacturing of touch display, is with a wide range of applications.

Figure 10 is the process flow diagram of touch display of the present invention touch point location determining method, comprising:

Step 1, the deflecting body that is touched produce deflection, and at least three resistor type angle sensors that are connected with said deflecting body produce electric current with said deflection to be changed;

Step 2, the electric current variation of gathering said at least three resistor type angle sensors;

Step 3, change according to the electric current of said at least three resistor type angle sensors and to obtain the touch point position coordinate.

Wherein, said step 3 comprises:

Step 31, change according to the electric current of said at least three resistor type angle sensors and to obtain the deflection angle of deflecting body in each resistor type angle sensor position;

Step 32, obtain the touch point position coordinate in the deflection angle of each resistor type angle sensor position according to deflecting body.

Wherein, said step 31 comprises:

Step 311, change the deflection that obtains elasticity resistance wire in each resistor type angle sensor at least according to the electric current of said three resistor type angle sensors;

Step 312, obtain the deflection angle of deflecting body in each elastoresistance silk position according to the deflection of each elastoresistance silk.

The technical scheme of touch display of the present invention touch point location determining method is introduced in the technical scheme of aforementioned touch display of the present invention in detail, repeats no more.

What should explain at last is: above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and the scope of technical scheme of the present invention.

Claims (7)

1. touch display; Comprise fixed body and deflecting body; It is characterized in that; Be provided with between said fixed body and the deflecting body with the deflection that deflecting body produced that is touched and produce at least three resistor type angle sensors that electric current changes, said at least three resistor type angle sensors are connected with data processing equipment, and said data processing equipment is used for changing acquisition touch point position coordinate according to the electric current of said at least three resistor type angle sensors;

Wherein, each resistor type angle sensor comprises:

Bracing or strutting arrangement, two ends are connected with deflecting body with fixed body respectively, are used for when deflecting body is touched and produce distortion, and making deflecting body is fulcrum deflection with said bracing or strutting arrangement;

Elastoresistance silk, two ends are connected with deflecting body with fixed body respectively, and the deflection that is used for producing with deflecting body produces elastic deformation;

Current collecting device is connected with said elastoresistance silk, is used to gather the electric current variation that the elastoresistance silk produces the elastic deformation front and back, and said electric current variation is sent to said data processing equipment;

Wherein, said data processing equipment comprises:

The deflection processing module is connected with each current collecting device, is used for producing the deflection angle of the electric current variation acquisition deflecting body of elastic deformation front and back in each elastoresistance silk position according to each elastoresistance silk;

The position processing module is connected with said deflection processing module, is used for obtaining the touch point position coordinate according to the deflection angle of deflecting body in each elastoresistance silk position.

2. touch display according to claim 1 is characterized in that, said resistor type angle sensor is three or four, is separately positioned on the bight of said deflecting body.

3. touch display according to claim 1 is characterized in that, said fixed body is a backlight.

4. touch display according to claim 3 is characterized in that, said deflecting body is a display screen, and display screen and said backlight laterally arrange, and the distance between display screen and the said backlight is greater than 4mm.

5. touch display according to claim 1 is characterized in that, said deflection processing module comprises:

The deformation process unit is connected with each current collecting device, is used for producing according to each elastoresistance silk the deflection of each elastoresistance silk of electric current variation acquisition of elastic deformation front and back;

The deflection processing unit is connected with said deformation process unit, is used for obtaining the deflection angle of deflecting body in each elastoresistance silk position according to the deflection of each elastoresistance silk.

6. a touch display touch point location determining method is characterized in that, comprising:

Step 1, the deflecting body that is touched produce deflection, and at least three resistor type angle sensors that are connected with said deflecting body produce electric current with said deflection to be changed;

Step 2, the electric current variation of gathering said at least three resistor type angle sensors;

Step 3, change according to the electric current of said at least three resistor type angle sensors and to obtain the touch point position coordinate.

Wherein, said step 3 comprises:

Step 31, change according to the electric current of said at least three resistor type angle sensors and to obtain the deflection angle of deflecting body in each resistor type angle sensor position;

Step 32, obtain the touch point position coordinate in the deflection angle of each resistor type angle sensor position according to deflecting body.

7. touch display according to claim 6 touch point location determining method is characterized in that said step 31 comprises:

Step 311, change the deflection that obtains elasticity resistance wire in each resistor type angle sensor at least according to the electric current of said three resistor type angle sensors;

Step 312, obtain the deflection angle of deflecting body in each elastoresistance silk position according to the deflection of each elastoresistance silk.

Images