CN101344829A

CN101344829A - Apparatus and method of multi-point touch screen

Info

Publication number: CN101344829A
Application number: CNA2008101473558A
Authority: CN
Inventors: 韩鼎楠
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-11
Filing date: 2008-08-11
Publication date: 2009-01-14

Abstract

A touch screen method confirms touch occurrence by detecting changes of light or sound waves passing through a material due to physical property changes of the material caused by the electric field of an approaching conductor. A touch screen based on the method, in particular a multi-point touch screen, can perform multi-point resolution and output the touch image of the touch area.

Description

The device and method of multi-point touch panel

Technical field:

The present invention relates to a kind of touch panel, particularly relate to a kind of multiple point touching panel.

Background technology:

The existing portable type electronic product that is applicable to, can realize that the touch screen technology that multiple spot is resolved has: the projected capacitive touch screen technology, in liquid crystal panel integrated illuminant module the optical profile type touch screen technology, survey the electroacoustic formula touch screen technology of distortion sound wave.

Summary of the invention:

When light by with the crystal of certain frequency vibration the time, acoustooptic modulation can take place.When conductors such as finger when being in piezoelectricity in the electrostatic field or ferroelectrics, can exert an influence because of polarization or the deformation that is applied in electrostatic field and produces to it.When conductors such as finger when being in piezoelectric in the alternating electric field, can exert an influence to its vibration that under extraneous electric field driven, takes place.These two kinds of changes all can be to passing the light of piezoelectric, or the light that the drive that is passed in piezoelectric produces the transparent material of deformation down exerts an influence.The variation of the contrast light of the light that receives by detection when not touching can be determined the generation that touches.Because when directed sound beams is passed the material that physical property changes, can be affected the same when perhaps being passed in the material that changes under other material drive with light, therefore the variation of the contrast sound wave of the sound wave that receives by detection when not touching also can be determined the generation that touches.Thereby piezoelectric also can be subjected to the material substitution that electric field influence exerts an influence to the light by wherein or sound wave with other physical property.

Description of drawings:

The present invention will make to specifically describe and be easier to understand in conjunction with following accompanying drawing, wherein:

Fig. 1 is the Petting Area side view of example one.

Fig. 2 is the adoptable structure of grating layer.

Fig. 3 is divided into the subregion synoptic diagram in a plurality of zones by the y coordinate for grating layer.

The Petting Area side view of Fig. 4 when adopting directed sound wave.

Embodiment:

Below in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 and embodiment the present invention is done and to describe in further detail.

Example one

As shown in Figure 1, the x axle is parallel to the Petting Area surface, and is vertical mutually with the y axle: 1 is the top layer cover glass.2 is grating layer, is made by transparent piezoelectric material and other transparent material.3 is drive electrode layer, and drive electrode is parallel to the x axle, equidistantly arranges along the y axle.4 for being equipped with the infrared ray or the ultraviolet emission band of grating, along the direction emission infrared ray or the ultraviolet ray that are parallel to the y axle.5 is the photoelectric commutator array, and the photoelectric commutator unit is equidistantly arranged along the x axle.6 is the bottom substrate, rises and supports protective effect.

When touch-screen was worked, infrared ray or ultraviolet emission band sent infrared ray or ultraviolet ray, and drive electrode is worked successively, and the grating layer that drives its top changes.When conductor is close, the electric field suffered to grating exerts an influence, the vibration situation or the form of grating are changed, make by grating light with respect to do not have conductor near the time change the light signal that system receives and each receiving element of recording light electric transducer array receives.In a complete work period, the grating layer All Ranges all is driven once.

The grating region of work when touch-screen system is received according to light, determine the y coordinate of the corresponding touch area of each light signal, determine the x coordinate of the touch area of each light signal correspondence according to the photoelectric commutator unit that receives light, thereby obtain each regional light signal distribution plan.

For accurate control grating, can adopt the method for a plurality of electrode drive the same area gratings.In order to guarantee the direction propagation of light, can adopt grating as shown in Figure 2.Wherein: 7,8,9 is electrode.10,11 is the transparent piezoelectric material.10, be filled with optical gel or resin between 11, play absorbing vibration and stop light to penetrate 10,11 effect.During touch-screen work, light passes through in 10,11, and 7,8 is one group, and 8,9 is one group of grating region of working successively between two electrodes of control.

With Fig. 3 is example, and grating layer is divided into a plurality of zones by different driving electrode or drive electrode group according to the y coordinate, and its workflow is as follows:

Step 1: infrared ray or ultraviolet emission band are started working, and send infrared ray or ultraviolet ray.The work of photoelectric commutator array, the system log (SYSLOG) light signal that this moment, each photoelectric commutator unit received down.

Step 2: the grating in the zone of y coordinate y=y1 is started working under the driving of electrode.Photoelectric commutator array work, the light by grating when receiving the grating work of y=y1 zone.The light signal that light signal that each photoelectric commutator unit received when grating was worked by system and step 1 obtain compares, and obtains the change in optical signal degree distribution figure of Petting Area y=y1 correspondence.

Step 3: y=y2 starts working in the zone, and repeating step one all is driven once up to the grating layer All Ranges to step 2, obtains each regional change in optical signal degree distribution figure.

Step 4: the change in optical signal degree distribution figure that each is regional is spliced, obtain whole Petting Area correspondence change in optical signal degree distribution figure.

Step 5: discern after the change in optical signal degree distribution figure noise reduction of whole Petting Area correspondence, a situation arises to obtain touch on the Petting Area.

It more than is a complete work period.

Because when directed sound beams is passed the material that physical property changes, when perhaps being passed in the material that changes under other material drive, can be affected the same with light, therefore the light that passes grating layer among the present invention can replace by having direction-sense beam of sound, infrared ray or ultraviolet emission band replace with the ultrasonic generator that has acoustic grating, the photoelectric commutator array replaces with the acoustical-electrical transducer array, and grating layer replaces with the acoustic grating layer.

The Petting Area side view as shown in Figure 4,12 is the top layer cover glass, 13 is the acoustic grating layer, 14 is drive electrode layer, 15 is the bottom substrate, 16 is the acoustic-electrical transducer array, 17 is ultrasonic generator.

The acoustic-electrical transducer array also can be with being reflection strip and the replacement of single acoustic-electrical transducer that miter angle is parallel to plane, Petting Area place with the y axle.Striped is reversed to the sound wave parallel with the x axle with the sound wave parallel with the y axle of incident, and the method by sound ranging obtains the x axial coordinate.Acoustic grating and grating also can adopt the structure of reflection strip.

Piezoelectric in this example can be subjected to electric field influence with other physical property, thus the material substitution that the light by wherein or sound wave are exerted an influence.

Some signal Processing and the correlation technique that the present invention relates to belong to mature technology well-known to those skilled in the art, are not described in detail.

Claims

1, a kind of method of senses touch generation, it is characterized in that, passed through the light of the material that physical property in the electric field is subjected to electric field influence or the variation of sound wave by detection, or the light by detecting the material that changes under driving through the material that is subjected to electric field influence in physical property or the variation of sound wave, confirm that conductor is close, touch and take place.

2, method according to claim 1 is characterized in that, is subjected to the material of electric field influence to adopt piezoelectric.

3, a kind of multi-point touch panel is characterized in that, has adopted grating layer at Petting Area.

4, a kind of multi-point touch panel is characterized in that, has adopted the acoustic grating layer at Petting Area.

5, adopt the touch-screen of the described method of claim 1, it is characterized in that, adopt a plurality of electrode drive to be subjected to the material of electric field influence simultaneously.