CN203849719U - Strong light disturbance prevention infrared touch screen - Google Patents
Strong light disturbance prevention infrared touch screen Download PDFInfo
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- CN203849719U CN203849719U CN201420223631.5U CN201420223631U CN203849719U CN 203849719 U CN203849719 U CN 203849719U CN 201420223631 U CN201420223631 U CN 201420223631U CN 203849719 U CN203849719 U CN 203849719U
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- infrared
- circuit
- infrared touch
- high light
- touch panel
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Abstract
The utility model provides a strong light disturbance prevention infrared touch screen. The strong light disturbance prevention infrared touch screen comprises transmitting tubes, receiving tubes and a control circuit, wherein the transmitting tubes and the receiving tubes are arranged around a display screen in a dual-redundancy staggered mode at intervals. The strong light disturbance prevention infrared touch screen is characterized in that general infrared touch infrared receiving triode sensors are replaced by infrared receiving diode sensors, a strong light detection module is added to a sampling circuit, and independent sampling is achieved. The infrared touch screen can still normally work under the condition that incidence is achieved at any angle with the sunshine illuminance smaller than 70000LUX, and the infrared touch screen can be used in most atmosphere environments.
Description
Technical field
The utility model relates to a kind of infrared touch panel, is specifically related to a kind of infrared touch panel of anti-intense laser interfere.
Background technology
Infrared touch panel, because of its stability, becomes in the first-selection of various severe environment applications occasions and touches scheme, but having in sunshine direct projection situation, because the saturated meeting of infrared reception triode high light causes infrared touch panel touch recognition malfunctioning.
Existing anti-high light infrared touch panel is taked two schemes conventionally: one, adopt the minimizing solar radiation probabilistic method (as shown in Figure 1) of moving after infrared reception triode (being called for short PT), the method has suitable limitation, as the possibility that direct sunlight disturbs, anti-light poor effect; They are two years old, adopt infrared-emitting diode (being called for short LED) and the staggered layout arrangement mode of infrared reception triode by identification sunniness direction, carry out the sunlight of hiding of power valve and the rotation of receiving tube opposite side, if the method limitation be sunlight skim over fast two relatively receive limits and more than two receive limit or sunlight in the situation that of strong reflection or scattering, article two, relatively receive limit and more than two receive limit while being subject to irradiating, touch-screen malfunctioning equally (as shown in Figure 2).
Conventionally infrared touch panel mainly receives the light signal work of the LED on opposite by PT.If there is the object of touch shading light signal, PT does not receive light signal.And in the energy distribution of sunshine, infrared band accounts for 48.3%, so incide PT surface in sunlight intensity, and while reaching certain value, even without the infrared light that receives LED and send, PT also can produce very large photocurrent, PT will reach capacity, now no matter whether have touch object, sampling end always obtains high level signal, conventionally triode sample circuit (as shown in Figure 3).Through verification experimental verification, in sunlight illuminance, at 10000LUX, light is being less than in 30 ° of situations, and PT is by saturated.
For making PT avoid saturated, adopt the minimizing solar radiation probabilistic method of moving after PT shown in Fig. 1, sunlight and screen are less than certain angle incident, and PT still can be saturated.As shown in Figure 2, adopt the staggered layout arrangement method of LED and PT, by sampled value analysis being judged to high light incident orientation, the wheel that carries out again power valve and receiving tube opposite side brings hides sunlight, but the method can not judge that sunlight skims over fast two and relatively receives the above or sunlight in limits in the situation that of strong reflection or scattering, article two, situation when reception limit is subject to irradiating above relatively, and, linear random because environmental light intensity changes, the characteristic of touch-screen LED array, it is also variant that PT produces photocurrent size, is easy to occur mistake.
Summary of the invention
In order to solve deficiency of the prior art, the utility model provides a kind of infrared touch panel of anti-intense laser interfere, this infrared touch panel is less than arbitrarily angled incident under 70000LUX in sunlight illuminance, and infrared touch panel still can normally be worked, and can make infrared touch panel use under most atmospheric environments.
The purpose of this utility model realizes by the following technical solutions:
A kind of infrared touch panel of anti-intense laser interfere, comprise display screen and adopt the staggered mode of being intervally arranged of two redundancies to be arranged on display screen power valve and receiving tube around, it is characterized in that, use the infrared reception triode sensor of common infrared touch (being called for short PT) instead infrared receiving diode sensor (being called for short PD), on sample circuit, increase high light detection module, separately sampling.
PD is difficult to saturated under any strong sunlight irradiates, and causes infrared receiving sensor saturation problem thereby can effectively improve high light, adopts the staggered mode of being intervally arranged of the two redundancies of power valve and receiving tube can improve the anti-intense laser interfere ability of infrared touch panel.Increase high light detection module, separately sampling.Tradition high light detection module is by the sampled signal to through amplifying, both be used as strong illumination position judgment, be used as again touch objects location recognition, but general infrared touch panel acquired original signal is after thousand grades of amplifications, through AD conversion, almost approach the maximal value (generally in 2V left and right) of AD sampling through amplifying signal amplitude (generally in 1.5V left and right) again.When certain receiving sensor is during by strong illumination, the energy of high light radiation is far longer than the light intensity of LED transmitting, the AD end sample magnitude 2V that rises violently at once, thus can identify the position of strong illumination infrared touch panel.But in actual conditions, inconsistent due to power valve and receiving tube itself, and various reflection of ambient light and scattering, and impact on circuit, cause the AD numerical value of touch-screen sampling not quite identical, conventionally the amplitude variation range of every receiving tube is between 0.85V ~ 2V, is very easy to occur erroneous judgement.
Particularly, described infrared transmitting tube diode (being called for short LED) and the staggered layout of infrared reception diode (being called for short PD) are arranged, for reducing strong illumination, LED is placed on front row, and PD is placed on rear row, and this arrangement mode benefit is, before every PD, there are 2 LEDs, they shelter from the left and right sides and irradiate the high light of coming, and PD has moved the high distance of infrared tube relatively afterwards, can very effective reduction PD by the probability of strong illumination.
Concrete, it is that 3 composition sample circuits of one group of time sharing sampling are given the main control chip AD sample port that model is STM32103 by every infrared receiving diode 8 that the high light pick-up unit in described sample circuit is opened 74HC4051 by simulation.
Because original signal amplitude is all lower, generally in 30mV left and right.Strong illumination is during to receiving tube, and original signal will be overturn tens of to hundred times, thereby hold to sample clearly to find whether be strong illumination by AD2, even can segment out the influence degree of high light to receiving tube.
In the utility model, adopt the anti-high light infrared touch panel of the two redundancies circuit with high light testing circuit module, adopt two cover A, B two overlaps operating circuit, every cover operating circuit infrared reception diode circuit and infrared-emitting diode pipe gate array, LED drive circuit, sampling control circuit, amplifying circuit, every cover circuit detects separately sampling infrared photodiode state.The main control chip control that two cover circuit and high light testing circuit are STM32103 by model.A overlaps circuit, and LED is distributed in top and the right, and PD is respectively on the following and left side; B cover, LED is distributed in below and the left side, and PD distinguishes on top and the right.
Adopt anti-high light technical scheme of the present invention can effectively reduce the impact of strong sunlight on LED, by theory and verification experimental verification mode, have the following advantages:
(1), by changing infrared receiver device PT into PD, through verification experimental verification, be less than arbitrarily angled incident infrared touch panel under 70000LUX in sunlight illuminance and still can normally work.
(2) by changing infrared receiver device PT into PD, adopt the staggered layout type of four edges, approach arbitrarily angled incident infrared touch panel under 100000LUX in sunlight illuminance and still can normally work.Under test condition, adopt 2 catoptrons (95% reflectivity), adjust catoptron and make 3 limits of infrared touch panel all by sunlight normal incidence, sunlight illuminance approaches 70000LUX and finds that infrared touch panel is malfunctioning.
Find by a series of test, under common surface state, air scattering or the reflection of conventional object, be all difficult to exceed 70000LUX, and infrared touch panel still can normally be worked.When there being the mirror-reflection of high reflectance, and simultaneously direct sunlight and reflected light reflection be while covering 3 side conditions, and infrared touch is just disturbed malfunctioning by sunlight.But under the common service condition of infrared touch panel, the probability that this situation occurs is extremely low.
(3) adopt and in sample circuit, add high light detection module to sample separately to original signal, original signal is through amplifying, and the original signal value under high light condition is compared amplitude under normal circumstances and changed highly significant.Accuracy rate is high, and accuracy rate almost reaches 100%.
Brief description of the drawings
Fig. 1 moves the anti-hard light device structural representation of mode after infrared receiving tube;
Fig. 2 is the two anti-hard light device structural representations of redundancy of infrared receiving tube and power valve;
Fig. 3 is the staggered layout of utility model infrared touch panel LED and PD;
Fig. 4 is that in the utility model, infrared tube is arranged schematic diagram;
Fig. 5 is this high light sample circuit schematic diagram in the utility model;
Fig. 6 is the anti-high light infrared touch panel of the two redundancies circuit block diagram with high light testing circuit module in the utility model;
Wherein, in Fig. 1,1-connector, 2-PCB, 3-panel, 4-PT backspacing a position, 5-PT original position, 6-cover, 7-optical filtering bar, the 8-PT backspacing a position sunlight zone of influence, the 9-PT original position sunlight zone of influence;
In Fig. 2,11-touch objects, the infrared reception triode of 12-, 13-infrared-emitting diode;
In Fig. 3,14-A overlaps infrared receiving diode, and 15-A overlaps infrared-emitting diode, and 16-B overlaps infrared receiving diode, and 17-B overlaps infrared-emitting diode.
Embodiment
Below by drawings and Examples, the utility model is further described and described, specific embodiment described herein is only for explaining technology contents of the present utility model, and is not used in restriction the utility model.
The utility model provides a kind of infrared touch panel of anti-intense laser interfere, adopt the staggered mode of being intervally arranged of the two redundancies of power valve and receiving tube to improve the anti-intense laser interfere of infrared touch panel, wherein said power valve is infrarede emitting diode, described receiving tube is infrared photodiode, on sample circuit, increase high light detection module, sampling separately, only gather 3 signals of every 8 infrared reception diodes, sampled signal is not amplified, sample clearly to find whether be strong illumination by end, even can segment out the influence degree of high light to receiving tube.
With reference to accompanying drawing 3, according to LED and PT putting position, touch-screen is divided into A group and B group, wherein, A cover transmitting (LED) 15 and A cover receive (PD) 14 and are defined as A group; B cover transmitting (LED) 17 and B cover receive (PD) 16 and are defined as B group.
With reference to accompanying drawing 4, the staggered layout of LED and PD in the present invention, LED is placed on front row, PD is placed on rear row, has 2 LEDs before every PD, and they shelter from the left and right sides and irradiate the high light of coming, PD has moved (H1+H2) distance relatively afterwards, can very effective reduction PD by the probability of strong illumination.
Wherein: L is that infrared tube is long, H1+H2 is that infrared tube is high;
D is infrared tube spacing;
A is infrared tube transmitting acceptance angle;
K is upper and lower pad safe spacing;
X, Y be pad than actual package large go out part;
Consider constraint condition:
1, meet accuracy requirement under high light, i.e. D requirement;
2, meet multiple point touching requirement under high light, i.e. A requirement;
In actual use, infrared tube physical dimension: 3.2 × 1.6 × 2.5mm, X=0.35mm, Y=0.6mm
According to above-mentioned analysis, when K gets 1.15mm, ensure upper and lower pad safe spacing; D gets 6.0mm, meets accuracy requirement under high light, and corresponding A is 28.1 degree, meets the requirement of infrared touch panel multiple spot.
Fig. 5 is this high light sample circuit schematic diagram in the present invention, in figure, only provide the circuit of one group of 8 PD, PD1 ~ PD8 is infrared photodiode, R1 ~ R8 is respectively the sampling resistor of corresponding PD1 ~ PD8, and Q2 is 8550 type PNP triodes, plays 8 PD groups and selects on-off action, U1 is that model is the analog switch of 74HC4051, j0 ~ j7 is corresponding R1 ~ R8 sampling end network, and U20 is main control chip, and model is STM32103.
Main control chip U1 controls upper group of PD1 ~ PD8 by Q2_en and selects switch Q2 to open, get PD3, PD6, the sampling end j2 of PD8, j5, j8 is directly connected on the IO mouth of analog switch U1, enables U1_en and address strobe s1, s2 by main control chip control simulation switch, s3, according to this order by sampling diode be subject to light-struck sampled signal j2, j5, main control chip sampling is given in j8 timesharing.The situation circuit of more PD is all according to mono-group of 8 PD, selects switch to select by control group, and sampling end network j0 ~ j7 be all groups share.
With reference to accompanying drawing 6, be the anti-high light infrared touch panel of the two redundancies circuit with high light testing circuit module, synchronization only has A cover or B cover to work independently.A overlaps operating circuit and comprises, A organizes LED circuit, A group PD circuit, A group signal gating and amplifying circuit; B overlaps operating circuit and comprises, B organizes LED circuit, B group PD circuit, group-b signal gating and amplifying circuit.A group and B organize all control and are completed by main control chip STM32F103.
The utility model is only to gather 3 signals of every group of 8 PD, sampled signal is not amplified, and directly delivers to the AD2 port of main control chip.
The infrared touch panel of anti-intense laser interfere of the present utility model can effectively reduce the impact of strong sunlight on LED, by theory and verification experimental verification mode, has the following advantages:
(1), by changing infrared receiver device PT into PD, shielding LED/PT high light judges opposite side handoff functionality, through verification experimental verification, is less than arbitrarily angled incident infrared touch panel under 70000LUX still can normally works in sunlight illuminance.
Conventionally on atmospheric envelope, sunlight is more than illuminance is greater than 150000LUX, and under sunny high noon in summer weather (air visibility is greater than 20km), the arrival ground illuminance that sunlight direct puncture is crossed atmospheric envelope is generally less than 100000LUX.As shown in table 1, use PD can make infrared touch panel use under most atmospheric environments as infrared receiving sensor.
Table 1 ground common sunlight illuminance table (1 normal atmosphere is depressed)
(2) by changing infrared receiver device PT into PD, add high light pick-up unit, approach arbitrarily angled incident infrared touch panel under 100000LUX in sunlight illuminance and still can normally work.Under test condition, adopt 2 catoptrons (95% reflectivity), adjust catoptron and make 3 limits of infrared touch panel all by sunlight normal incidence, sunlight illuminance approaches 70000LUX and finds that infrared touch panel is malfunctioning.
Find by a series of test, under common surface state, air scattering or the reflection of conventional object, be all difficult to exceed 70000LUX, and infrared touch panel still can normally be worked.When there being the mirror-reflection of high reflectance, and simultaneously direct sunlight and reflected light reflection be while covering 3 side conditions, and infrared touch is just disturbed malfunctioning by sunlight.Under the common service condition of infrared touch panel, the probability of appearance is extremely low.
(3) adopt high light circuit of the present utility model to sample separately to original signal, original signal is through amplifying, and the original signal value under high light condition is compared amplitude under normal circumstances and changed highly significant.Comparing traditional is certain method that has strong illumination to judgement in AD sampled data, and this high light structure of the detecting device is simple, and accuracy rate is high, and accuracy rate almost reaches 100%.
(4) traditional high light detection mode is by complicated mode, data analysis to be judged, because sampled signal is without the amplification of certain multiple, noise can be very large, thereby indistinguishable useful signal, but approach AD maximal value through the sampled signal amplitude of amplifying, and self and installation nonuniformity of power valve and receiving tube directly cause complicated algorithm to judge the accuracy of high light.
And the utility model is only that every 8 receiving tubes of original signal are gathered to 3 signals, original signal is not amplified, sample and directly receive another AD port, the amplitude under normal circumstances very low (<30mV) of original signal, through strong illumination, amplitude will reach (0.5V ~ 2V), whether has strong illumination to which bar limit of touch-screen thereby very significantly judge.
Claims (3)
1. an infrared touch panel for anti-intense laser interfere, is characterized in that, mainly comprises infrared-emitting diode and infrared receiving diode, increases high light pick-up unit in sample circuit, separately sampling; High light pick-up unit in described sample circuit is that 3 composition sample circuits of one group of time sharing sampling are given main control chip AD sample port by analog switch 74HC4051 by every infrared receiving diode 8; The circuit of described anti-high light infrared touch panel adopts A, B two to overlap operating circuit, the infrared reception diode circuit that every cover circuit comprises and infrared-emitting diode pipe gate array, LED drive circuit, sampling control circuit, amplifying circuit, the control of A cover circuit respectively in the top of touch-screen, the LED on the right, and below, the receiving tube on the left side; The control of B cover circuit respectively touch-screen below, the LED on the left side, and the receiving tube on top, the right.
2. the infrared touch panel of a kind of anti-intense laser interfere according to claim 1, it is characterized in that, the main control chip control that two described cover high light testing circuits are STM32103 by model, the work at present state of infrared touch panel or A cover work independently, or B cover works independently, high light testing circuit is sampled to the corresponding receiving tube of work at present circuit, deliver to the AD port on main control chip, main control chip judges whether current reception limit has intense laser interfere, if find, there is intense laser interfere on current reception limit, main control chip is taked A, B two overlaps circuit and switches, thereby the receiving tube after switching is avoided intense laser interfere impact.
3. the infrared touch panel of a kind of anti-intense laser interfere according to claim 1, it is characterized in that, described infrared-emitting diode and the described infrared receiving diode layout arrangement mode that interlocks, described infrared-emitting diode is placed on front row, described infrared receiving diode is placed on rear row, before infrared receiving diode described in every, there is the infrared-emitting diode described in 2, they shelter from the left and right sides and irradiate the high light of coming, and described infrared receiving diode has moved the high distance of infrared tube relatively afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420223631.5U CN203849719U (en) | 2014-05-05 | 2014-05-05 | Strong light disturbance prevention infrared touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420223631.5U CN203849719U (en) | 2014-05-05 | 2014-05-05 | Strong light disturbance prevention infrared touch screen |
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| CN203849719U true CN203849719U (en) | 2014-09-24 |
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| CN201420223631.5U Expired - Fee Related CN203849719U (en) | 2014-05-05 | 2014-05-05 | Strong light disturbance prevention infrared touch screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105094455A (en) * | 2014-05-19 | 2015-11-25 | 上海沐泽信息技术有限公司 | Device and method for improving strong light interference resistance of infrared touch screen |
| CN111949163A (en) * | 2020-08-19 | 2020-11-17 | 中航华东光电有限公司 | Infrared touch screen capable of achieving night vision compatibility |
-
2014
- 2014-05-05 CN CN201420223631.5U patent/CN203849719U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105094455A (en) * | 2014-05-19 | 2015-11-25 | 上海沐泽信息技术有限公司 | Device and method for improving strong light interference resistance of infrared touch screen |
| CN111949163A (en) * | 2020-08-19 | 2020-11-17 | 中航华东光电有限公司 | Infrared touch screen capable of achieving night vision compatibility |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20190505 |
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| CF01 | Termination of patent right due to non-payment of annual fee |