CN101813994A - Touch position identifying method - Google Patents
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- CN101813994A CN101813994A CN 201010164495 CN201010164495A CN101813994A CN 101813994 A CN101813994 A CN 101813994A CN 201010164495 CN201010164495 CN 201010164495 CN 201010164495 A CN201010164495 A CN 201010164495A CN 101813994 A CN101813994 A CN 101813994A
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Abstract
A kind of touch position identifying method, the position of touch of energy identification object touching optical touch control panel.Optical touch control panel comprises at least: optics sensing element, light guide plate and may command light source, wherein, the may command light source is disposed at the light inlet side of light guide plate.This touch position identifying method comprises: alternately the may command light source is carried out breakdown action and closing motion interval time to set; Make that Photosensing Units is obtained corresponding to the n image data of breakdown action and (n+2) image data at least, and corresponding to (n+1) image data and (n+3) image data of closing motion, wherein n is a natural number; And above-mentioned image data carried out calculation step, obtaining first comparing data and second comparing data, and according to the position of touch of first comparing data and the second comparing data identification object.
Description
Technical field
The invention relates to a kind of touch position identifying method, and particularly relevant for a kind of touch position identifying method (Touched Position Identification Method) of optical touch control panel.
Background technology
Along with the fast development and the application of infotech, wireless mobile communication and information household appliances, in order to reach the more humane purpose of operation, many information products change into and use contact panel as input media by input medias such as traditional keyboard or mouses.
At present, contact panel roughly can be divided into electric resistance touch-control panel, capacitance type touch-control panel, sound wave type contact panel, optical touch control panel and electromagnetic touch-control panel etc.
Figure 1A and Figure 1B are the synoptic diagram that known optical formula contact panel (Optical touch panel) is in shading sensing modes (Light-shading sensing mode) and reflection sensing modes (Light-reflecting sensing mode) respectively.Please earlier with reference to Figure 1A, optical touch control panel 100 is disposed at module backlight 102 tops.Optical touch control panel 100 has a plurality of optics sensing element 104A, 104B, 104C.When the user pointing 106 or other article are when touching optical touch control panel 100, the variation that these optics sensing elements 104A, 104B, 104C can sense ambient light and export corresponding signal is to carry out various default functions.
More specifically, the optics sensing modes of optics sensing element 104A, 104B, 104C can be divided into two kinds, and one is the shading sensing modes, and another is the reflection sensing modes.Please refer to Figure 1A, with the shading sensing modes, at the touch location place of finger 106, ambient light L
ECan crested and be difficult to incide among the optics sensing element 104B, but ambient light L
ECan incide among optics sensing element 104A, the 104C, that is optics sensing element 104B and optics sensing element 104A, 104C sense the ambient light L of varying strength respectively
E, and the signal of exporting different correspondences respectively is to reach the effect of touch-control control.
Because the shading sensing modes is with sense ambient light L
EThe situation of crested to be carrying out touch-control sensing, so, as ambient light L
EUndercapacity the time, the shading sensing modes will lose efficacy.In addition, because finger 106 areas that can cover to a certain degree cause accurately orienting touch point.
In addition, please continue with reference to Figure 1B, if with the reflection sensing modes, when finger 106 touches in optical touch control panel 100, the light L backlight that module 102 backlight can be sent
BIn the reflected back optics formula contact panel 100.At this moment, optics sensing element 104B just can receive the light L backlight after the reflection
B, optics sensing element 104A, 104C then are difficult to receive the light L backlight after the reflection
B, that is optics sensing element 104B and optics sensing element 104A, 104C sense the light L backlight of varying strength respectively
B, and the signal of exporting different correspondences respectively is to reach the effect of touch-control control.
Yet, as ambient light L
ECross when strong, all optics sensing element 104A, 104B, 104C can receive very strong ambient light L
E, make optics sensing element 104A, 104B, 104C can't accurately differentiate the light L backlight after the reflection
BWith ambient light L
E, that is the reflection sensing modes will lose efficacy.In addition, (that is light L backlight when optical touch control panel 100 presents the low-light level picture
BWhen more weak), optics sensing element 104A～104C will be difficult to sense the light L backlight after the reflection
B, that is the reflection sensing modes also will lose efficacy.
Generally, present optical touch control panel relied on external light (ambient light L in 1,000 minutes
EAnd light L backlight
B) condition, be difficult to be applied in the occasion of various varying environments.In addition, the detecting result of above-mentioned two kinds of patterns usually needs suitable complicated algorithm to come the specific position of touch that goes out, and has the problem of erroneous judgement easily.
Summary of the invention
The invention provides a kind of touch position identifying method,, make optical touch control panel can be widely used in the environment of different light intensity degree by the setting of light guide plate and may command light source.
Based on above-mentioned, the present invention proposes a kind of touch position identifying method, the position of touch of energy identification object touching optical touch control panel.Optical touch control panel comprises: first substrate, second substrate, the display medium between first substrate and second substrate, light guide plate and may command light source, wherein, dispose a plurality of optics sensing elements on first substrate, light guide plate is disposed at a side of second substrate, and the may command light source is disposed at the light inlet side of light guide plate.Above-mentioned touch position identifying method comprises the following steps: alternately the may command light source to be carried out breakdown action and closing motion interval time with a setting; Make that the optics sensing element is obtained corresponding to the n image data of breakdown action and (n+2) image data at least, and corresponding to (n+1) image data and (n+3) image data of closing motion, wherein, n is a natural number; And, will be corresponding to the n image data of breakdown action, (n+2) image data, and carry out calculation step corresponding to (n+1) image data, (n+3) image data of closing motion, obtaining first comparing data and second comparing data, and according to the position of touch of first comparing data and the second comparing data identification object.
In one embodiment of this invention, above-mentioned touch position identifying method is to try to achieve first comparing data by n image data and (n+1) image data, and tries to achieve second comparing data by (n+2) image data and (n+3) image data.
In one embodiment of this invention, above-mentioned touch position identifying method is to try to achieve first comparing data by n image data and (n+1) image data, and tries to achieve second comparing data by (n+1) image data and (n+2) image data.
In one embodiment of this invention, above-mentioned calculation step comprises additive operation.
In one embodiment of this invention, above-mentioned calculation step comprises subtraction.
In one embodiment of this invention, above-mentioned calculation step comprises the mutual exclusion exclusive disjunction.
In one embodiment of this invention, above-mentioned calculation step comprises the otherness computing.
The present invention additionally is provided with light guide plate and may command light source in optical touch panel, and the light that the may command light source is sent carries out total reflection and conducts in light guide plate.In case object touching optical touch panel is promptly destroyed in the total reflection condition at touch position place, makes the light scatter of in light guide plate, conducting light guide plate and advance toward the optics sensing element.Particularly, utilize the breakdown action and the closing motion of may command light source, obtain the image data under the different condition respectively.Again by carrying out computing for above-mentioned image data, the noise that can filtering environmental light be caused, the situation of avoiding judging by accident takes place.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Figure 1A and Figure 1B are in the synoptic diagram of shading sensing modes and reflection sensing modes respectively for known optical formula contact panel.
Fig. 2 is the synoptic diagram of the optical touch control panel of one embodiment of the invention.
Fig. 3 is the process flow diagram of a kind of touch control method of one embodiment of the invention.
Fig. 4 is the time sequential routine figure of a kind of touch control method of one embodiment of the invention.
Fig. 5 A and Fig. 5 B are five finger touches optical touch control panels, respectively the synoptic diagram of obtained image data under the situation that the may command light source opens and closes.
Fig. 6 is the time sequential routine figure of the touch position identifying method of another embodiment of the present invention.
Embodiment
Fig. 2 is the synoptic diagram of the optical touch control panel of one embodiment of the invention.Please refer to Fig. 2, optical touch control panel 200 comprises: first substrate 210, second substrate 250, display medium 240, light guide plate 260 and may command light source 270 between first substrate 210 and second substrate 250.
First substrate 210 for example is an active component array base board, disposes a plurality of dot structures (not illustrating) and a plurality of optics sensing element 220, and wherein each optics sensing element 220 can dispose corresponding to a dot structure.Second substrate 250 for example is a colored optical filtering substrates, disposes black-matrix layer (not illustrating) and chromatic filter layer (not illustrating).Display medium 240 for example is a liquid crystal molecule.
It should be noted that in the present embodiment light guide plate 260 is disposed at a side of second substrate 250, and may command light source 270 is disposed at by the light inlet side 260a of light guide plate 260.Be that the upper side that is disposed at second substrate 250 with light guide plate 260 is an example among Fig. 2, yet light guide plate 260 also can be positioned at the lower side (not illustrating) of second substrate 250.Moreover, Fig. 2 is to be example with light guide plate 260 additional configuration on second substrate 250, but in a further embodiment, also can directly use second substrate 250 (transparency carrier) to be used as light guide plate, and may command light source 270 is disposed at light inlet side (not illustrating) side of second substrate 250.
May command light source 270 can adopt the infrared light light emitting diode, and (Infrared light emittingdiode IR-LED), can send infrared light IR.Under general state, when promptly object 290 did not touch optical touch control panel 200, the infrared light IR that may command light source 270 is sent carried out total reflection in light guide plate 260.Yet, when object 290 touches optical touch control panel 200, object 290 can destroy the total reflection condition that infrared light IR conducts in light guide plate 260, the infrared light IR that makes may command light source 270 be sent is scattered out light guide plate 260 at object 290 position of touch, and is detected by optics sensing element 220.
In the present embodiment, optical touch control panel 200 can also comprise adhesion layer 252, Polarizer 254 and the reflection coating 256 that is arranged in regular turn on second substrate 250.In addition, if above-mentioned optical touch control panel 200 is penetrated the formula display panel for penetration or half-transparent half-reflection, then optical touch control panel 200 can also comprise a module 280 backlight, and it is arranged on the below of first substrate 210; Perhaps, if above-mentioned optical touch control panel 200 is a reflective display panel, module 280 backlight also can not need be set.
Next, will the touch position identifying method of one embodiment of the invention be described with reference to Fig. 2 to Fig. 5 B simultaneously.Fig. 3 is the process flow diagram of the touch position identifying method of one embodiment of the invention.Fig. 4 is the time sequential routine figure of the touch position identifying method of one embodiment of the invention.Fig. 5 A and Fig. 5 B are five finger touches optical touch control panels, respectively the synoptic diagram of obtained image data under the situation that the may command light source opens and closes.
Please at first, carry out step S310 simultaneously with reference to Fig. 2 to Fig. 5 B, set with one and alternately may command light source 270 is carried out breakdown action and closing motion interval time.In detail, may command light source 270 for example is to be connected with time schedule controller (not illustrating), make may command light source 270 have alternately an open period and down periods, and the open period of may command light source 270 and down periods for example are (frame period) during picture of formation.Among Fig. 4, the open period of may command light source 270 and the sequential T of down periods have been illustrated
270
Then, carry out step S320, when opening may command light source 270, make optics sensing element 220 obtain n image data PS corresponding to breakdown action
n, (n+2) image data PS
(n+2), (n+4) image data PS
(n+4),,, the rest may be inferred, and when closing may command light source 270, optics sensing element 220 can be obtained (n+1) image data PS corresponding to the down periods
(n+1), (n+3) image data PS
(n+3), (n+5) image data PS
(n+5),,, the rest may be inferred.Particularly, make that optics sensing element 220 is obtained corresponding to the n image data of breakdown action and (n+2) image data at least, and corresponding to (n+1) image data and (n+3) image data of closing motion, wherein, n is a natural number.Among Fig. 4, illustrated the obtained image data P of optics sensing element 220
220
Next, will further describe optics sensing element 220 corresponding to the open period of may command light source 270 and the sequential T of down periods
270And obtain image data P
220Mode.Mandatory declaration be to be among Fig. 4 with the obtained partial image data PS of optics sensing element 220
n, PS
(n+1), PS
(n+2), PS
(n+3)For example illustrates, in fact, optics sensing element 220 can be obtained a plurality of image datas.
Illustrate object 290 among Fig. 4 and obtained image data PS
(n+2)The time, begin to touch the object touching time point T of optical touch control panel 200
290In fact, object 290 can be at the optical touch control panel 200 of time point touching arbitrarily, as long as duration object 290 touching optical touch control panels 200, obtain two image datas such as the open period of may command light source 220 and down periods (PS for example at least
n, PS
(n+1)), can determine the touch position of object 290.
Below, suppose that object 290 is corresponding to obtaining n image data PS
nDuring and obtain (n+1) image data PS
(n+1)During do not touch optical touch control panel 200; And object 290 is obtained (n+2) image data PS in correspondence
(n+2)Open period and obtain (n+3) image data PS
(n+3)During touch optical touch control panel 200.
When optical touch control panel 200 is in not touch-control state (promptly not touched by object 290), the light that may command light source 270 sent can conduct in light guide plate 260 and can not detected by optics sensing element 220, no matter therefore be open period or the down periods corresponding to may command light source 270, optics sensing element 220 all only can receive ambient light, and obtains consistent image data PS
(n), PS
(n+1)
When object 290 touches optical touch control panel 200 and may command light source 270 and is in open period, object 290 can destroy light carries out total reflection in light guide plate condition, and the light scatter of conduction in the light guide plate 260 is gone out light guide plate 260, make its detecting target that becomes optics sensing element 220, the PS that obtains for example shown in Figure 4
(n+2)Image data.In other words, shown in Fig. 5 A, PS
(n+2)Image data is: optics sensing element 220 has been detected the light that shed by light guide plate 260 and the ambient light that covered by object 290 parts and getting.
Moreover, when object 290 touches optical touch control panel 200 and may command light source 270 and is in the down periods, the image data that optics sensing element 220 is detected, PS for example shown in Figure 4
(n+3)Image data, in other words, shown in Fig. 5 B, PS
(n+3)Image data is the ambient light that is covered by object 290 parts by optics sensing element 220 detects and getting.
Then, carry out computing, can obtain the touch position of object 290 touching optical touch control panels 200 for Fig. 5 A and Fig. 5 B.In detail, please be simultaneously with reference to Fig. 2 to Fig. 5 B, carry out step S330, to carry out calculation step corresponding to the image data of breakdown action and closing motion, obtaining the first comparing data D1 and the second comparing data D2, and according to the position of touch of the first comparing data D1 and the second comparing data D2 identification object 290.
In the above-mentioned explanation, the meaning that obtains n image data～(n+3) image data at least is, under the prerequisite that has four image datas at least, just can select a pair of image data of two kinds of operational patterns to carry out computing, can promote the degree of freedom that operational pattern is selected.First kind of operational pattern be, utilizing two image datas is that the mode of one group (n, (n+1)), ((n+2), (n+3)) is carried out computing.As shown in Figure 4, for example be to n image data PS
nWith (n+1) image data PS
(n+1)Carry out computing, obtaining the first comparing data D1, and to (n+2) image data PS
(n+2)With (n+3) image data PS
(n+3)Carry out computing, with obtain the second comparing data D2,,, the rest may be inferred.
Computing described herein can be to image data carry out additive operation (ADD), subtraction (SUB), mutual exclusion exclusive disjunction (XOR), otherness (Difference) wait this field known compute mode, these compute modes can be removed the noise that shade and ambient light caused of object 290, take place with position of touch that highlights object 290 and the situation of avoiding judging by accident.
In detail, in the present embodiment, for example be to n image data PS
nAnd (n+1) image data PS
(n+1)Carry out mutual exclusion or (XOR) calculation, to obtain the first comparing data D1.In this calculation, as mentioned before, when optical touch control panel 200 is in not the touch-control state, corresponding to the n image data PS of the open period of may command light source 270
nReach (n+1) image data PS corresponding to the down periods of may command light source 270
(n+1)Have consistent result, indifference between the two just, thereby can assert that optical touch control panel 200 be in the state of touching according to the first comparing data D1, that is, but have the function whether identification object 290 has touched optical touch control panel 200.
In addition, as mentioned before, when to (n+2) image data PS shown in Fig. 5 A and Fig. 5 B
(n+2)With (n+3) image data PS
(n+3)Carry out mutual exclusion or (XOR) calculation, can filtering the noise that caused of shadow of object and ambient light, and obtain as shown in Figure 4 the second comparing data D2, in other words, can accurately pick out the position of touch of object 290 according to the second comparing data D2.
That is to say, if to Fig. 5 A and Fig. 5 B pairing (n+2) image data PS
(n+2)With (n+3) image data PS
(n+3)Carry out otherness (Difference) calculation, the noise that can filtering shadow of object and ambient light be caused, and obtain as shown in Figure 4 the second comparing data D2, and according to the position of touch of the second comparing data D2 identification object 290.From the above, above-mentioned touch position identifying method can perform calculations to image data, can remove the noise that shade and ambient light caused of object 290, takes place with position of touch that highlights object 290 and the situation of avoiding judging by accident.
Fig. 6 is the time sequential routine figure of the touch position identifying method of another embodiment of the present invention.In another embodiment, as shown in Figure 6, second kind of operational pattern is: adjacent two continuous image datas are carried out computing, and try to achieve comparing data, that is to n image data PS
nWith (n+1) image data PS
(n+1)Carry out computing, obtaining the first comparing data D1, and to (n+1) image data PS
(n+1)With (n+2) image data PS
(n+2)Carry out computing, with obtain the second comparing data D2,,, the rest may be inferred.
Situation at Fig. 6 is a hypothesis: object 290 continues to be in the state of touching optical touch control panel 200, obtains image data PS at least
(n)～PS
(n+1)Deng two image datas, and for adjacent two continuous image data PS
(n)～PS
(n+1)Carry out computing, in the hope of comparing data.Can determine the touch position of object 290 by comparing data.Second kind of operational pattern can be promoted the operation efficiency of image data.For first kind of operational pattern of Fig. 4, second kind of operational pattern of Fig. 6 can be saved operation time, and promotes the efficient of touch position identifying method.
Hold above-mentionedly, shade and ambient light that known optical touch control panel is easy to generate because of touching object 290 cause noise, and the problem that causes position of touch to be difficult to recognize.Yet, in the present embodiment, respectively obtain an image data in the open period and the down periods of may command light source 270 by optics sensing element 220, can remove the noise that shade and ambient light caused of touching object, and highlight the position of touch of object.In other words, the touch position identifying method of present embodiment obtains the image data under the different situations by the open and close of may command light source, and gets final product the noise that filtering shade and surround lighting are caused by simple calculations.
In sum, touch position identifying method of the present invention has the following advantages at least:
By the control that the may command light source is opened and closed, make the optics sensing element correspond respectively to the light source open period and the light source down periods are obtained an image data, and, can accurately obtain the position of touch of object by image data is carried out calculation step.Because having the optical touch control panel of may command light source and light guide plate can be by aforesaid way filtering environmental optical noise, so plant can be the too bright or too not dark just correct sensing or lose the function of sensing of optical touch control panel, so can be widely used under the environment of different light intensity degree because of surround lighting.
Though the present invention with embodiment openly as above; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking aforesaid the claim scope person of defining.
Claims (7)
1. touch position identifying method, energy identification one object is touched a position of touch of an optical touch control panel, it is characterized in that, this optical touch control panel comprises one first substrate, one second substrate, the display medium between this first substrate and this second substrate, a light guide plate and a may command light source, wherein, dispose a plurality of optics sensing elements on this first substrate, this light guide plate is disposed at a side of this second substrate, and this may command light source is disposed at a light inlet side of this light guide plate, and this touch position identifying method comprises:
Alternately this may command light source is carried out a breakdown action and a closing motion interval time with a setting;
Make that those optics sensing elements are obtained corresponding to a n image data of this breakdown action and one (n+2) image data at least, and corresponding to (n+1) image data and one (n+3) image data of this closing motion, wherein, n is a natural number; And
Will be corresponding to this n image data of this breakdown action, this (n+2) image data, and carry out a calculation step corresponding to this (n+1) image data, this (n+3) image data of this closing motion, obtaining one first comparing data and one second comparing data, and according to this position of touch of this first comparing data and this this object of second comparing data identification.
2. touch position identifying method as claimed in claim 1 is characterized in that,, try to achieve this first comparing data by this n image data and this (n+1) image data; And
Try to achieve this second comparing data by this (n+2) image data and this (n+3) image data.
3. the touch position identifying method of stating as claim 1 is characterized in that,, try to achieve this first comparing data by this n image data and this (n+1) image data; And
Try to achieve this second comparing data by this (n+1) image data and this (n+2) image data.
4. touch position identifying method as claimed in claim 1 is characterized in that,, this calculation step comprises additive operation.
5. touch position identifying method as claimed in claim 1 is characterized in that,, this calculation step comprises subtraction.
6. touch position identifying method as claimed in claim 1 is characterized in that,, this calculation step comprises the mutual exclusion exclusive disjunction.
7. touch position identifying method as claimed in claim 1 is characterized in that,, this calculation step comprises the otherness computing.
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| CN2010101644953A CN101813994B (en) | 2010-04-16 | 2010-04-16 | Touch position identifying method |
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| CN2010101644953A CN101813994B (en) | 2010-04-16 | 2010-04-16 | Touch position identifying method |
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| CN101813994B CN101813994B (en) | 2012-03-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102622131A (en) * | 2011-01-28 | 2012-08-01 | 联想(北京)有限公司 | Electronic equipment and positioning method |
| CN103309469A (en) * | 2012-03-13 | 2013-09-18 | 原相科技股份有限公司 | Displacement detection device and operation method thereof |
| CN104914106A (en) * | 2014-03-11 | 2015-09-16 | 由田新技股份有限公司 | Defect detection method and defect detection device |
| WO2020020246A1 (en) * | 2018-07-24 | 2020-01-30 | 京东方科技集团股份有限公司 | Array substrate, display apparatus and spatial positioning method for display apparatus |
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| US20060214892A1 (en) * | 2005-03-28 | 2006-09-28 | Tsutomu Harada | Display device and display method |
| JP2007128497A (en) * | 2005-10-05 | 2007-05-24 | Sony Corp | Display apparatus and method thereof |
| CN101281446A (en) * | 2008-05-28 | 2008-10-08 | 友达光电股份有限公司 | Optical reflection type touching control panel and pixel as well as system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060214892A1 (en) * | 2005-03-28 | 2006-09-28 | Tsutomu Harada | Display device and display method |
| JP2007128497A (en) * | 2005-10-05 | 2007-05-24 | Sony Corp | Display apparatus and method thereof |
| CN101281446A (en) * | 2008-05-28 | 2008-10-08 | 友达光电股份有限公司 | Optical reflection type touching control panel and pixel as well as system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622131A (en) * | 2011-01-28 | 2012-08-01 | 联想(北京)有限公司 | Electronic equipment and positioning method |
| CN102622131B (en) * | 2011-01-28 | 2015-04-29 | 联想(北京)有限公司 | Electronic equipment and positioning method |
| CN103309469A (en) * | 2012-03-13 | 2013-09-18 | 原相科技股份有限公司 | Displacement detection device and operation method thereof |
| CN103309469B (en) * | 2012-03-13 | 2016-04-27 | 原相科技股份有限公司 | Displacement detector and method of operating thereof |
| CN104914106A (en) * | 2014-03-11 | 2015-09-16 | 由田新技股份有限公司 | Defect detection method and defect detection device |
| WO2020020246A1 (en) * | 2018-07-24 | 2020-01-30 | 京东方科技集团股份有限公司 | Array substrate, display apparatus and spatial positioning method for display apparatus |
| US11637149B2 (en) | 2018-07-24 | 2023-04-25 | Boe Technology Group Co., Ltd. | Array substrate, display device and spatial positioning method of display device |
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|---|---|
| CN101813994B (en) | 2012-03-14 |
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