CN102929445A - Ghost focus determining method and touch screen - Google Patents
Ghost focus determining method and touch screen Download PDFInfo
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- CN102929445A CN102929445A CN2012104055659A CN201210405565A CN102929445A CN 102929445 A CN102929445 A CN 102929445A CN 2012104055659 A CN2012104055659 A CN 2012104055659A CN 201210405565 A CN201210405565 A CN 201210405565A CN 102929445 A CN102929445 A CN 102929445A
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Abstract
The invention provides a ghost focus determining method and a touch screen. The ghost focus determining method comprises the steps of: selecting four incline light beams; for a candidate touch point, calculating luminous fluxes shielded by the first light beam, the second light beam, the third light beam and the fourth light beam; calculating a first sum value and a second sum value, wherein the first sum value is equal to a sum of the luminous value blocked by and the first light beam and the luminous value blocked by the fourth light beam, the second sum value is a sum of the luminous value blocked by the second light beam and the luminous flux blocked by the third light beam; comparing the first sum value with the second sun value; if the first sum value is less than the second sum value, indicating the candidate touch point is the ghost point; and the first sum value is more than the second sum value, indicating the candidate touch point is a ghost point. According to the embodiment of the invention, through comparing the first sum value with the second sum value, the touch point and the ghost point are determined, the operation quantity is reduced, the judgment speed is increased, and the determining accuracy is ensured.
Description
Technical field
The application relates to the touch screen technology field, specifically, relates to a kind of ghost point and determines method and touch-screen.
Background technology
Fig. 1 is existing touching technique schematic diagram, comprises the Diode by LED(Light Emitting among Fig. 1, light emitting diode) and PD(Photo Diode, photodiode) form the array of n x m, described LED is luminous, and described PD receives light.Touch if having a bit, corresponding light beam is blocked, thereby can calculate position, corresponding touch point.
Fig. 2 is the another kind of schematic diagram of existing touching technique.There are 2 touches among Fig. 2, described 2 refer to touch by both hands, are blocked owing to anyhow having four bundle light, form altogether four point of crossing, except two true touch points (representing to collude mark), two is exactly its terrible point (representing with terrible shape mark) in addition.
General skew ray bundle commonly used is determined terrible point, and when LED, light beam and PD were in same plane, the quantity of skew ray bundle was sufficient.But there is the compact not shortcoming of structure in this conplane design.Fig. 3 is LED of the prior art, PD and light-strip Multi-layer design schematic diagram.So-called Multi-layer design refers to the needs for compact design, and LED, light beam and PD are placed Different Plane.LED and PD are on the PCB at the screen back side (Printed Circuit Board, circuit printing plate), and after the light beam that LED sends passed screen surface, through light-strip guiding PD, PD received described light beam.But adopt the light-strip leaded light, the skew ray bundle of formation very limited (often less than or equal to 8 bundles) for the very limited situation of skew ray bundle, is also determined terrible some scheme by the skew ray bundle in the prior art without comparison efficiently.
Summary of the invention
For the problems of the prior art, the purpose of the embodiment of the invention is to provide a kind of method and touch-screen of definite ghost point.
In first aspect, the embodiment of the invention provides a kind of method of definite ghost point, said method comprising the steps of: on first direction, receive the light beam that each LED sends among a plurality of LED by a plurality of PD, select the skew ray bundle of four symmetries from the light beam that described a plurality of PD receive, described skew ray bundle is the first light beam, the second light beam, the 3rd light beam and the 4th light beam; Calculation procedure for a pair of candidate touch point on the described direction, is calculated the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked; Calculate first and value and second and value, described first and value be the luminous flux sum that the luminous flux that is blocked of the first light beam and the 4th light beam are blocked, described second with value be the luminous flux sum that the luminous flux that is blocked of the second light beam and the 3rd light beam are blocked; Described a pair of candidate touch point comprises true touch point point terrible with it; Comparison step, more described first and value and described second and the value size; Determining step according to comparative result, is determined true touch point or terrible point.
In second aspect, the embodiment of the invention provides a kind of touch-screen, described touch-screen comprises: select module, be used at first direction, receive the light beam that each LED sends among a plurality of LED by a plurality of PD, select the skew ray bundle of four symmetries from the light beam that described a plurality of PD receive, described skew ray bundle is the first light beam, the second light beam, the 3rd light beam and the 4th light beam; Computing module, be used for for a pair of candidate touch point on the described direction, calculate the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked, and calculate first and value and second and value, described first and value be the luminous flux sum that the luminous flux that is blocked of the first light beam and the 4th light beam are blocked, described second with value be the luminous flux sum that the luminous flux that is blocked of the second light beam and the 3rd light beam are blocked; Described a pair of candidate touch point comprises true touch point point terrible with it; Comparison module is used for more described first and value and described second and the size that is worth; Determination module is used for according to comparative result, determines true touch point or terrible point.
The embodiment of the invention is for candidate's touch point, calculate the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked, judge with value which candidate touch point is terrible point in the described a pair of candidate touch point with value and second by more described first, reduced operand, improve the speed of judging, guaranteed the degree of accuracy of determining.
Description of drawings
Fig. 1 is existing touching technique schematic diagram;
Fig. 2 is the another kind of schematic diagram of existing touching technique;
Fig. 3 is LED of the prior art, PD and light-strip Multi-layer design schematic diagram;
Fig. 4 A is a kind of process flow diagram that a kind of ghost point of the embodiment of the invention is determined method;
Fig. 4 B is the another kind of process flow diagram that a kind of ghost point of the embodiment of the invention is determined method;
Fig. 5 is the schematic diagram that the ghost point is determined the symmetrical inclined light beam formation that method relates among Fig. 4 A-4B;
Fig. 6 is a kind of touch-screen schematic diagram of the embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is carried out detailed, clear, complete explanation.Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.
Fig. 4 A is the process flow diagram that a kind of ghost point of the embodiment of the invention is determined method.Shown in Fig. 4 A, described method comprises:
Be specially, on first direction, receive the light beam that each LED sends among a plurality of LED by a plurality of PD, select the skew ray bundle of four symmetries from the light beam that described a plurality of PD receive, the skew ray bundle of described four symmetries is the first light beam, the second light beam, the 3rd light beam and the 4th light beam.Described first direction is the direction between described LED and the PD, can be understood as light beam that LED sends to the logical direction that PD advances, and typically is transverse direction or perpendicular direction, and perhaps other direction is not done restriction at this.
Particularly, described PD and described LED can be Heterogeneous Permutation (can referring to Fig. 5).That is to say direction of beam propagation the above PD and described LED between misplace, typically, LED is over there on the perpendicular bisector between two PD, and is same, PD is over there on the perpendicular bisector between two LED.Can certainly take other dislocation mode, not do restriction at this.
Preferably, described a plurality of LED are three LED, and described a plurality of PD are four PD.
Further preferably, described three LED are continuously arranged three LED, and described four PD are continuously arranged four PD, and described the second light beam and the 3rd light beam send by the middle LED among described continuously arranged three LED.
Alternatively, the skew ray bundle of described four symmetries is received by different PD.Although therefore described the second light beam and the 3rd light beam are with being sent by middle LED, owing to being received by different PD, so can be considered as separate.Fig. 5 is the schematic diagram that described symmetrical inclined light beam forms.In Fig. 5, the left side is three continuously arranged LED under upper, and the right is four continuously arranged PD from top to bottom, forms the skew ray bundle of four symmetries between described LED and the PD.It is about equally with respect to the degree of being inclined upwardly of described first direction or the gradient that dips down that described symmetry means the skew ray bundle.
Be noted that described a plurality of LED also can be other a plurality of LED beyond three, for example four, five etc., restriction do not done at this.And described a plurality of LED can not be continuously arranged also.Described a plurality of PD also can be other a plurality of PD beyond four, for example three, five etc., do not do restriction at this.And described a plurality of PD can not be continuously arranged also.
Be specially, for a pair of candidate touch point on the described direction, calculate the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked; Calculate first and value and second and value, described first and value be the luminous flux sum that the luminous flux that is blocked of the first light beam and the 4th light beam are blocked, described second with value be the luminous flux sum that the luminous flux that is blocked of the second light beam and the 3rd light beam are blocked; Described a pair of candidate touch point comprises a true touch point point terrible with it.
Preferably, described calculating first and value and second also comprise the luminous flux normalization that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked before with value.
Alternatively, described calculating first and value with second with value before also be included as the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam be blocked and give different weights.Described weight can rule of thumb arrange.Be the simplified operation amount, a kind of particular form is that the entitlement weight average is identical, for example all is set to 1.In fact be equal to this moment does not adopt weight.
Step 106 according to comparative result, is determined true touch point or terrible point.
Particularly, shown in Fig. 4 B, if described comparative result be described first and value less than described second and value, then the candidate touch point of definite close beam emissions side is true touch point, on the other hand terrible point; If described comparative result be described first and value greater than described second and value, then definite close light beam take over party's candidate touch point is true touch point, on the other hand terrible point; Described comparative result be described first and value equal described second and value, then described method changes described first direction into second direction, and the aforementioned described step on first direction is carried out again.
Be noted that, can hocket in the definite process on the first direction and the definite process on second direction, also can carry out simultaneously, and both definite results can confirm mutually, if determine that the result is consistent, the correctness of then determining the result is strengthened, if both definite results produce contradiction, then select first and value and second and value between definite result on larger that direction of difference as correct definite result.
Fig. 6 is a kind of touch-screen schematic diagram of the embodiment of the invention.As shown in Figure 6, described touch-screen comprises selects module 200, computing module 202, comparison module 204, determination module 206, wherein:
Select module 200, be used on first direction, receiving the light beam that each LED of a plurality of LED sends by a plurality of PD, select the skew ray bundle of four symmetries from the light beam that described a plurality of PD receive, the skew ray bundle of described four symmetries is the first light beam, the second light beam, the 3rd light beam and the 4th light beam; Described first direction is the direction between described PD and the LED, and when touch-screen was rectangle, described first direction typically was the wide place direction of rectangle or the long place direction of rectangle, and perhaps other direction is not done restriction at this.
Particularly, described PD and described LED can Heterogeneous Permutations.That is to say direction of beam propagation the above PD and described LED between misplace, typically, LED is over there on the perpendicular bisector between two PD, and is same, PD is over there on the perpendicular bisector between two LED.Can certainly take other dislocation mode, not do restriction at this.
Preferably, described a plurality of LED are three LED, and described a plurality of PD are four PD.
Further preferably, described three LED are continuously arranged three LED, and described four PD are continuously arranged four PD, and described the second light beam and the 3rd light beam send by the middle LED among described continuously arranged three LED.
Alternatively, described four light beams are received by different PD.Although therefore described the second light beam and the 3rd light beam are with being sent by middle LED, owing to being received by different PD, so can be considered as separate.
Be noted that described a plurality of LED also can be other a plurality of LED beyond three, for example four, five etc., restriction do not done at this.And described a plurality of LED can not be continuously arranged also.Described a plurality of PD also can be other a plurality of PD beyond four, for example three, five etc., do not do restriction at this.And described a plurality of PD can not be continuously arranged also.
Computing module 202 is used for for a pair of candidate touch point on the described first direction, calculates the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked; Calculate first and value and second and value, described first and value be the luminous flux sum that the luminous flux that is blocked of the first light beam and the 4th light beam are blocked, described second with value be the luminous flux sum that the luminous flux that is blocked of the second light beam and the 3rd light beam are blocked; Described a pair of candidate touch point comprises a true touch point point terrible with it.
Preferably, described calculating first and value and second also comprise the luminous flux normalization that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked before with value.
Alternatively, described calculating first and value with second with value before also be included as the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam be blocked and give different weights.Described weight can rule of thumb arrange.Be the simplified operation amount, a kind of particular form is that the entitlement weight average is identical, for example all is set to 1.In fact be equal to this moment does not adopt weight.
Comparison module 204 is used for more described first and value and described second and the size that is worth;
Determination module 206 is used for according to comparative result, determines true touch point or terrible point.
Particularly, if described comparative result be described first and value less than described second and value, then the candidate touch point of definite close beam emissions side is true touch point, on the other hand terrible point; If described comparative result be described first and value greater than described second and value, then definite close light beam take over party's candidate touch point is true touch point, on the other hand terrible point; Described comparative result be described first and value equal described second and value, then described selection module changes described first direction into second direction.The described step of aforementioned all modules that relate at first direction will be carried out again.
Be noted that, can hocket in the definite process on the first direction and the definite process on second direction, also can carry out simultaneously, and both definite results can confirm mutually, if determine that the result is consistent, the correctness of then determining the result is strengthened, if both definite results produce contradiction, then select first and value and second and value between definite result on larger that direction of difference as correct definite result.
Those skilled in the art should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Those skilled in the art can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought the scope that exceeds the application.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not used in the protection domain that limits the application; all within the application's spirit and principle, any modification of making, be equal to replacement, improvement etc., all should be included within the application's the protection domain.
Claims (8)
1. a method of determining the ghost point is characterized in that, said method comprising the steps of:
On first direction, receive the light beam that each LED sends among a plurality of LED by a plurality of PD, select the skew ray bundle of four symmetries from the light beam that described a plurality of PD receive, the skew ray bundle of described four symmetries is the first light beam, the second light beam, the 3rd light beam and the 4th light beam;
For a pair of candidate touch point on the described direction, calculate the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked; Calculate first and value and second and value, described first and value be the luminous flux sum that the luminous flux that is blocked of the first light beam and the 4th light beam are blocked, described second with value be the luminous flux sum that the luminous flux that is blocked of the second light beam and the 3rd light beam are blocked; Described a pair of candidate touch point comprises true touch point point terrible with it;
More described first and value and described second and the value size;
According to comparative result, determine true touch point or terrible point.
2. the method for definite ghost point as claimed in claim 1 is characterized in that,
Described comparative result be described first and value less than described second and value, then the candidate touch point of definite close beam emissions side is true touch point, on the other hand terrible point;
Described comparative result be described first and value greater than described second and value, then definite close light beam take over party's candidate touch point is true touch point, on the other hand terrible point;
Described comparative result be described first and value equal described second and value, then described method changes described first direction into second direction.
3. such as the method for the described definite ghost point of one of claim 1-2, it is characterized in that, described a plurality of LED are three LED, and described a plurality of PD are four PD.
4. the method for definite ghost point as claimed in claim 3, it is characterized in that, described three LED are continuously arranged three LED, and described four PD are continuously arranged four PD, and described the second light beam and the 3rd light beam send by the middle LED among described continuously arranged three LED.
5. a touch-screen is characterized in that, described touch-screen comprises:
Select module, be used at first direction, receive the light beam that each LED sends among a plurality of LED by a plurality of PD, select the skew ray bundle of four symmetries from the light beam that described a plurality of PD receive, described skew ray bundle is the first light beam, the second light beam, the 3rd light beam and the 4th light beam;
Computing module, be used for for a pair of candidate touch point on the described direction, calculate the luminous flux that the first light beam, the second light beam, the 3rd light beam and the 4th light beam are blocked, and calculate first and value and second and value, described first and value be the luminous flux sum that the luminous flux that is blocked of the first light beam and the 4th light beam are blocked, described second with value be the luminous flux sum that the luminous flux that is blocked of the second light beam and the 3rd light beam are blocked; Described a pair of candidate touch point comprises true touch point point terrible with it;
Comparison module is used for more described first and value and described second and the size that is worth;
Determination module is used for according to comparative result, determines true touch point or terrible point.
6. touch-screen as claimed in claim 5 is characterized in that, described comparative result be described first and value less than described second and value, the definite close beam emissions side of described determination module be true touch point, terrible point on the other hand; Described comparative result be described first and value greater than described second and value, the definite close light beam take over party's of described determination module is true touch point, on the other hand terrible point; Described comparative result be described first and value equal described second and value, described selection module also is used for changing described first direction into second direction.
7. such as the described touch-screen of one of claim 5-6, it is characterized in that, described a plurality of LED are three LED, and described a plurality of PD are four PD.
8. touch-screen as claimed in claim 7, it is characterized in that, described three LED are continuously arranged three LED, and described four PD are continuously arranged four PD, and described the second light beam and the 3rd light beam all are the light beams that sent by the middle LED among described continuously arranged three LED.
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| CN2012104055659A CN102929445A (en) | 2012-10-23 | 2012-10-23 | Ghost focus determining method and touch screen |
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| CN2012104055659A CN102929445A (en) | 2012-10-23 | 2012-10-23 | Ghost focus determining method and touch screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104657002A (en) * | 2014-12-02 | 2015-05-27 | 友达光电股份有限公司 | touch system and touch detection method |
| CN107003758A (en) * | 2015-06-16 | 2017-08-01 | 华为技术有限公司 | ghost point processing method and user equipment |
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