CN101592789B - Automatic glare-shielding control method for liquid crystal sunglasses and control device thereof - Google Patents
Automatic glare-shielding control method for liquid crystal sunglasses and control device thereof Download PDFInfo
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- CN101592789B CN101592789B CN2008101113957A CN200810111395A CN101592789B CN 101592789 B CN101592789 B CN 101592789B CN 2008101113957 A CN2008101113957 A CN 2008101113957A CN 200810111395 A CN200810111395 A CN 200810111395A CN 101592789 B CN101592789 B CN 101592789B
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Abstract
The invention relates to an automatic glare-shielding control method for liquid crystal sunglasses and a control device thereof. The control method comprises the following steps: liquid crystal lens are arranged on the sunglasses, and conductive film electrodes and controllers are arranged on both sides of the liquid crystal lens; the output ends of the controllers are connected with a light angle sensor and an illuminance sensor, when illuminance is less than a set threshold value, the voltage output is controlled by the controllers with no dark band; when illuminance is larger than the set threshold value, dark band control voltage is output by the controllers according to the angle of a light source to the liquid crystal lens; according to the characteristics that when the voltage rises to a certain value, a dark band is seen above a lens and the dark band can move down with the increase of the voltage, dark bands seen by human eyes are moved to shield the position of the light source by the controllers which use the dark band control voltage, and the dark band control voltage is higher than the upper limit of the critical value of the control voltage in homogeneous transmittance sensitive control region of the lens. The invention can realize the function of automatic shielding dynamic glare in a certain direction on non-division lens and has the advantages of simple structure and small volume.
Description
Technical field
The present invention relates to a kind of sunglasses, be specifically related to a kind of control method of blocking high light automatically and control device that is used for liquid crystal sunglasses.
Background technology
The light transmission rate of liquid crystal is relevant with the voltage that adds thereon, it has following photoelectric characteristic: when voltage is lower than the lower limit critical value, its light transmission rate changes slowly, insensitive, when control voltage is higher than the lower limit critical value and is lower than upper limit critical value again, the even transmittance of liquid crystal can reduce along with the rising of voltage sensitively, form the responsive control zone of even transmittance, after voltage is higher than upper limit critical voltage, light transmission rate has promptly no longer changed with the rising of voltage, so people are when using the transmittance of Control of Voltage liquid crystal sunglasses, the variation range of its control voltage all is selected on the responsive control zone, between the lower critical value, by changing the transmittance that magnitude of voltage in this scope changes liquid crystal lens.When outside average light photograph is strong, generally can be by strengthening the transmittance that control voltage reduces liquid crystal glasses, but for the such intense light source of the sun, if the transmittance of whole eyeglass is all reduced, promptly can when blocking the sun, also block other zone, such as causing the road in advancing also not see, so the liquid crystal sunglasses that has adopts the regional area to liquid crystal glasses to strengthen control voltage, only make this regional area deepening, other zone keeps enough transmittances, obtains the effect of " only hide the sun and do not hide the road ".But the intense light source in the human eye visual field is dynamic change, need the position of shading also to need continuous variation on the eyeglass, this has brought difficulty just for the control variable color, and the grid stick of some liquid crystal glasses by bidimensional control arranged, and dynamically blocks the incident light in some zones.The control mode complexity of these class glasses, need by more greatly, heavier, expensive electronic-controlled installation realizes its function, because practicality is relatively poor, so far do not see its commercialization, and the method for this class subregion control all will be divided into a plurality of zones to liquid crystal lens, could realize the control to the part, occurs the light and shade subregion on eyeglass, these glasses need keep a fixing distance between human eye and eyeglass, to calculate the angle of incident high light.This just will certainly make control circuit complicated, has increased the volume of control system, makes and use all inconveniences.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, a kind of control method of blocking high light automatically and control device that is used for liquid crystal sunglasses is provided, use this control method and control device will not be divided into a plurality of zones by liquid crystal lens, only the dynamic control that can be in the light according to the realization part, orientation of intense light source automatically on the eyeglass of a slice conducting film electrode is all arranged on the two sides, and have simple in structure, the characteristics that volume is little.
The control method that addresses the above problem comprises following content:
A, be provided with liquid crystal lens, two faces all have the conducting film of layer of transparent, constitute electrode, and two electrodes are electrically connected with the control end of controller;
B, optic angle degree sensor is set, to the visual angle transducing signal of controller input light source to the people;
C, illuminance sensor is set, to the transducing signal of controller input ambient light illumination;
D, when illuminance during less than setting threshold, controller does not have the output of filaments of sun control voltage;
E, when illuminance during greater than setting threshold, controller is according to the angle of light source, to liquid crystal lens output filaments of sun control voltage, be elevated to this eyeglass top meeting appearance one blanking bar that the certain value descendant arrives soon according to voltage, and this blanking bar characteristic that can move down with the further rising of voltage, controller moves on to the position of blocking this light source by the blanking bar that this filaments of sun control voltage is seen human eye.
Described filaments of sun control voltage is higher than the upper limit critical value of the responsive control zone control of the even transmittance of eyeglass voltage.
Apparatus of the present invention are: be provided with liquid crystal lens, two faces of eyeglass have the conducting film of layer of transparent respectively, constitute liquid crystal electrode, and two electrodes are electrically connected with the control end of controller; The controller input end is connected to illuminance sensor, to the transducing signal of controller input ambient light illumination; The controller input end is connected to optic angle degree sensor, to the angle sensor signal of controller input external light source.
As previously mentioned, in the prior art, people utilize the liquid crystal characteristic that even transmittance can reduce with the rising of voltage in certain control voltage range that the penetrability of liquid crystal lens is controlled, promptly evenly in the responsive control zone of transmittance liquid crystal transmittance is being controlled, because after voltage is elevated to responsive control zone control upper voltage limit critical value, evenly transmittance promptly can be not again continue to change with the rising of voltage, so in the prior art the control voltage of liquid crystal generally all is limited in below the upper limit critical value of the responsive control zone control of even transmittance voltage.
But the present invention notices a kind of like this physical phenomenon: after control voltage is raised to more than the upper limit critical value, though the even transmittance of whole eyeglass is no longer controlled, but because the angular characteristics of liquid crystal cell and polaroid, when human eye is seen the external world by liquid crystal lens, a shadow striped band can appear in the top by the eyeglass of an angle setting, and this blanking bar can move down with the further rising of voltage, this blanking bar is relevant with the view directions of human eye, with the range-independence of glasses, so the custom that can wear glasses because of different people and difference occurs not from human eye.
Need to prove: when liquid crystal lens when human eye is very near, although this blanking bar also can present by other direction, but can by rotation this blanking bar fully be presented by horizontal direction according to the directivity of eyeglass, the width that striped presents depends on the distance between eyeglass and human eye.Based on normal distance to lens surface, there is a central angle in the central authorities of striped, and central angle does not depend on the distance between human eye and eyeglass.If the shadow striped is a level, central angle does not change according to the distance between human eye central authorities and the eyeglass top.Therefore, the position that the shadow striped occurs on eyeglass is independently, is not subjected to the mode that glasses wear and the influence of wearer face shape, and every pair of glasses can be worn at large, and need not require that the relative position of regulating between human eye and the eyeglass recalibrates.
The present invention utilizes this characteristic just, when ambient light is strong, utilizes the filaments of sun control voltage that is higher than the responsive control zone control of even transmittance upper voltage limit critical value, is controlled at the position that the filaments of sun occur on the eyeglass, reaches the purpose of dynamically blocking some direction high light.
The present invention needn't be to the liquid crystal lens zoning, just can be implemented in the eyeglass part and dynamically block the automatic control of certain orientation high light, and different people is not required the relative position of regulating between human eye and the eyeglass, easy to use, and have simple in structure, the advantage that volume is little.
Description of drawings
Fig. 1, embodiment of the invention structural representation
Fig. 2, embodiment of the invention control flow chart
The relativeness figure of Fig. 3, optic angle degree sensor and tested incident light
The angle of light of Fig. 4, liquid crystal lens and (Ia-Ib)/(Ia+Ib) between characteristic curve
Fig. 5, under a series of voltages the angular characteristics figure of TN class LCDs
The synoptic diagram of correlativity between Fig. 6, light penetration and the incident angle
Fig. 7, liquid crystal lens are activated the banded shadow striped of appearance and its grey scale change synoptic diagram
Fig. 8, embodiment of the invention control waveform figure
Embodiment
Referring to this routine structural representation of Fig. 1.
Be provided with liquid crystal lens, two face all has the conducting film of layer of transparent, constitutes electrode, and two electrodes are electrically connected with the controller control output end, and the controller input end is connected to light intensity sensor and optic angle degree sensor.
Controller is the integrated cpu chip of numeral, and this chips welding is electrically connected with other parts by printed circuit board (PCB) on printed circuit board (PCB).
Solar cell is powered to described cpu chip, angular transducer and optical sensor by printed circuit board (PCB).
Cpu chip uses Texas Instruments company product, and model is MSP430F2012, and this cpu chip has contained analogue-to-digital converters.Also have a lot of other cpu chips to can be used as suitable substitute, the microcontroller that has contained operational amplifier also can be used as a selection, and as the product of TexasInstruments company, its model is MSP430F2234.Control circuit can be designed as the combination of using logic gate and amplifier, and replaces the use of microcontroller.
Liquid crystal lens adopts positivity TN-liquid crystal, and two faces of described liquid crystal lens all have the conducting film of layer of transparent, and described conducting film is connected on the pin attached to the connector of this liquid crystal lens separately.The polarization direction of front and back two polaroids of this liquid crystal lens is mutually orthogonal, and becomes miter angle in horizontal direction.
Usually the filaments of sun that can by rotational angle liquid crystal lens be occurred more than upper limit critical value voltage according to the directivity of liquid crystal be level to.
The eyeglass of any other type if the angle of minimum transmitance is the function of the voltage that applies, also can be the substitute of liquid crystal lens.To applying control voltage between two transparency conducting layers, electric field causes reorientating of liquid crystal particle, in certain incident angle scope, reduces the transmitance of light.
Referring to Fig. 3, optic angle degree sensor that this is routine and illuminance sensor are to have adopted a combined light inductor that comprises optic angle degree detector and illuminance sensor, this photoelectric transducer element is provided with a photoelectric tube PA and PB respectively in conplane top and the bottom, be provided with a shadow shield vertical in the middle of two photoelectric tubes with this plane, constitute two photometric measurers, the photocurrent output terminal of two photometric measurers is electrically connected with the cpu chip input end by printed circuit board (PCB).
After this photoelectric transducer element is contained in sunglasses, its normal overlaps with the normal of liquid crystal lens, when incident light impinges perpendicularly on this photoelectric sensing unit, the photosensitive area of two photoelectric tubes is identical, the photocurrent Ia that detects equates with Ib, when incident light with normal θ incident at an angle the time, under the influence of shadow shield, effective photosensitive area of two photoelectric tubes is unequal, photocurrent Ia, Ib is also unequal, the amount that this sensor forms (Ia-Ib)/(Ia+Ib) (see figure 4) that is directly proportional with incident angle θ, so constitute the angle sensor signal, cpu chip calculates this amount can try to achieve incident angle of light θ, and value (Ia+Ib) then is proportional to the illumination of sunshine, constitutes the illumination transducing signal; Cpu chip calculates this amount can obtain average light illumination.The maximum detection angles of this sensor is positive and negative 50 degree.
The Part No. that this example adopts Hamamatsu Photonics company to provide is that the S6560 product is as above-mentioned optic angle degree sensor and illuminance sensor, the illuminance that it can be sensed according to each photodiode, output current is to two output pins of sensor.
The alternative means of the sensor can be: the combination of any other photodetector, if can sense intensity of illumination and incident angle, also can be used as angle probe and illuminance inductor, can respond to visible light and ultraviolet photodiode for two, its combination can be used as the substitute of S6560 detector.Detector to the position sensor sensitivity, CCD (charge-coupled device (CCD)) array, or the measurement of angle sensitive detector of other form can substitute the two photodiodes in the angle probe.Operational amplifier can be converted to voltage signal with each current signal, and the analog to digital converter in the microcontroller is a digital signal with all analog signal conversion, and therefore the direction of light source and the intensity of illumination are calculated.Another selection is, the voltage by each photodiode can directly measure, and do not need the conversion of such electric current and voltage.Angle probe also can be substituted by manual adjustments control device such as pot.
Fig. 5 is illustrated in the angular characteristics of TN class LCDs under a series of control voltages, the transmitance of liquid crystal lens is the function that is added in the voltage difference on the eyeglass, along with the rising of on-load voltage, the angle of minimum transmitance (being the angle that on the eyeglass human eye is produced blanking bar) can be near an angle that arrives lens surface usually.
Aforesaid optic angle degree, optical sensor and liquid crystal lens are contained on the sunglasses, the sensor normal is overlapped with the lens normal, and cpu chip calculates intense light source incident angle θ with respect to normal on eyeglass according to the value of sensor signal (Ia-Ib)/(Ia+Ib).
Because the blanking bar that produces on the liquid crystal lens is only relevant with the view directions of human eye, with the range-independence of human eye, so controller can be selected control voltage according to the angular characteristics that Fig. 5 shows to eyeglass.
For example: the incident angle θ that goes out the relative eyeglass normal of intense light source according to the angle sensor calculated signals when controller is 30 when spending, according to Fig. 5 as can be known: when selecting 2.4 volts of voltages, concerning human eye, the regional transmittances that on the eyeglass at the visual angle are 30 degree are minimum, form banded dark space, other regional transmittance increases, and forms the area pellucida, promptly is chosen as 2.4 volts so control voltage this moment.And existence one density transition region (referring to Fig. 7) between the light and shade district.
Fig. 6 illustrates the correlativity between light penetration and the incident angle, the intensity and the incident angle of angle probe 4 probing lights 11, if light intensity surpasses a limit value, liquid crystal lens is activated the light that blocks the incident angle of light 13 core incident angles 12 that measure.Light on from other angular illumination to liquid crystal lens as the light from incident angle 14, can pass through eyeglass, and its transmitance is similar with the transmitance that is in the liquid crystal lens of starting state not.To user, blocked by a shadow striped from the high light at light source place, and other zone has just kept a visual field that does not have deepening.
Add DC voltage to LCDs and can cause ion to move, lower the life-span of LCDs, so be AC controling signal the liquid crystal lens loading.
The filaments of sun control voltage that this example provides is the alternating voltage that frequency is identical, dutycycle is identical, can regulate the height of its effective value by regulating its dutycycle, amplitude or phase place in-migration.
Fig. 8 is this routine control waveform figure.
What battery was imported cpu chip is DC voltage, this example utilizes cpu chip and output control terminal able to programme thereof that direct current is become interchange, be added on two control electrodes of liquid crystal, if do the liquid crystal control end with ground of cpu chip and an output terminal, then can not satisfy the requirement that the liquid crystal needs exchange control, this example utilizes two output terminals control liquid crystal can satisfy requirement to AC controling signal.As shown in Figure 9, when the photoelectric cell output voltage is V0, the operating voltage of cpu chip is V0 just, and its A output terminal can output amplitude be the square wave of v0 by programmed control, equally to the B output terminal, by programmed control can output amplitude be the square wave of V0, but phase place and A end differ 180 degree, and the A end has just become AC signal with the voltage difference conversion in time of B end, satisfy liquid crystal control requirement, and the output of square wave can be finished with the timer conter in the cpu chip by software programming.
Nearly step this control circuit of ground needs according to the operating voltage that is added on the cpu chip, and substep is controlled the square wave amplitude of two output terminal and mutual phase place, produces required interchange control voltage.
When intensity of illumination is higher than a limit value, microcontroller produces two signals, is added in first signal on first output pin, changes between the reference ground voltage of microcontroller and supply voltage; Second signal on second output pin changes and first signal out-phase between the reference ground voltage of microcontroller and supply voltage, and keeps fixing differing.The dutycycle of two signals is chosen to produce the standard deviation effective voltage of needs.When intensity of illumination is lower than limit value, when being added in effective voltage on the microcontroller and being not enough to start it, microcontroller sends with reference to ground voltage to two output pin.
Fig. 2 is the program flow chart of present embodiment control system, and angle probe is surveyed incident angle of light, if light intensity numerical value is enough high, then microprocessor starts.Microprocessor is gathered simulated data from angle probe, and by its analogue-to-digital converters, data are converted to numerical data, the incident angle by calculating light and the corresponding dutycycle of output signal, generation is to the filaments of sun control voltage of liquid crystal lens output, make the relevant position place of eyeglass banded shadow striped occur, thereby block light from this incident angle.
Control voltage to the liquid crystal lens output filaments of sun according to the following steps successively for this cpu chip:
Step 1
To cpu chip input service voltage threshold, it is directly proportional with the critical value of illuminance;
Step 2
When illuminance was lower than its critical value, the input voltage of this cpu chip was lower than described operating voltage threshold value, did not then start, and the electrode of described liquid crystal lens does not have the input of control voltage;
When illuminance is higher than its critical value, the input voltage value of the cpu chip that photocurrent Ia+Ib forms is greater than the operating voltage threshold value, cpu chip starts, to square wave voltage signal that frequency, dutycycle are all set of an electrode output of liquid crystal lens, execution in step 4 simultaneously;
Be calculated as follows incident angle θ: θ=K* (Ia-Ib)/(Ia+Ib); Wherein K is a 60-90 setting value;
Step 5
Another electrode output frequency to liquid crystal lens is identical, out-phase keeps setting the square wave voltage signal that differs, the liquid crystal lens electrode has been applied interchange control voltage with certain effective value, make the transmitance in the described liquid crystal lens zone of this incident light θ correspondence descend a lot, form the dark space, light on from other angular illumination to liquid crystal lens then can see through more, forms relative area pellucida;
Above-mentioned embodiment can realize:
When illuminance is higher than setting threshold, controller output is higher than the filaments of sun control voltage of the responsive control zone control of the even transmittance of eyeglass upper voltage limit critical value, position according to filaments of sun appearance on the high light incident angle control eyeglass, play the effect of blocking high light, when illuminance is lower than setting threshold, controller does not have the output of filaments of sun control voltage, and eyeglass is in not slave mode.
The situation that also illuminance can be lower than setting threshold is arranged to the state of a control to the even penetrability of eyeglass, and its method is:
When illuminance was lower than setting threshold: controller was exported even light according to intensity of illumination and is controlled voltage thoroughly, the even penetrability of control eyeglass, described even light are controlled magnitude of voltage thoroughly between the upper limit critical value and lower limit critical value of the responsive control zone control of the even transmittance of eyeglass voltage.
The above; it only is preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs to the protection domain of technical solution of the present invention to any simple modification, equivalent variations and modification that above embodiment did.
Claims (9)
1. be used for the control method of blocking high light automatically of liquid crystal sunglasses, comprise following content:
A, be provided with liquid crystal lens, two faces all have the conducting film of layer of transparent, constitute electrode, and two electrodes are electrically connected with the control end of controller;
B, optic angle degree sensor is set, to the visual angle transducing signal of controller input light source to the people, controller calculates incident angle of light in view of the above;
C, illuminance sensor is set, to the transducing signal of controller input ambient light illumination, controller calculates illuminance in view of the above;
D, when illuminance during less than setting threshold, controller does not have the output of filaments of sun control voltage;
E, when illuminance during greater than setting threshold, controller is according to the angle of light source, to liquid crystal lens output filaments of sun control voltage, be elevated to this eyeglass top meeting appearance one blanking bar that the certain value descendant arrives soon according to voltage, and this blanking bar characteristic that can move down with the further rising of voltage, controller moves on to the position of blocking this light source by the blanking bar that this filaments of sun control voltage is seen human eye.
2. the control method of blocking high light automatically that is used for liquid crystal sunglasses according to claim 1 is characterized in that: described filaments of sun control voltage is higher than the upper limit critical value of the responsive control zone control of the even transmittance of eyeglass voltage.
3. the control method of blocking high light automatically that is used for liquid crystal sunglasses according to claim 1, described filaments of sun control voltage is the alternating voltage that frequency is identical, dutycycle is identical.
4. the control method of blocking high light automatically that is used for liquid crystal sunglasses according to claim 3 is characterized in that: described filaments of sun control voltage is the square-wave voltage that frequency is identical, dutycycle is identical.
5. according to the described control method of blocking high light automatically that is used for liquid crystal sunglasses of the arbitrary claim of claim 1-4, it is characterized in that: when illuminance is lower than setting threshold: controller is exported even light according to intensity of illumination and is controlled voltage thoroughly, the even penetrability of control eyeglass, described even light are controlled magnitude of voltage thoroughly between the upper limit critical value and lower limit critical value of the responsive control zone control of the even transmittance of eyeglass voltage.
6. be used for the control device that blocks high light automatically of liquid crystal sunglasses, it is characterized in that: be provided with liquid crystal lens, two faces of eyeglass have the conducting film of layer of transparent respectively, constitute liquid crystal electrode, and two electrodes are electrically connected with the control end of controller; The controller input end is connected to illuminance sensor, to the transducing signal of controller input ambient light illumination; The controller input end is connected to optic angle degree sensor, to the angle sensor signal of controller input external light source.
7. the control device that blocks high light automatically that is used for liquid crystal sunglasses according to claim 6, it is characterized in that: described controller is the integrated cpu chip of numeral, this chips welding is electrically connected with other parts by printed circuit board (PCB) on printed circuit board (PCB).
8. the control device that blocks high light automatically that is used for liquid crystal sunglasses according to claim 6 is characterized in that: the polarization direction of front and back two polaroids of described liquid crystal lens is mutually orthogonal, and from the horizontal by miter angle.
9. want the 6 described control device that block high light automatically that are used for liquid crystal sunglasses according to right, it is characterized in that: described optic angle degree sensor and illuminance sensor are to have adopted a combined light inductor that comprises optic angle degree detector and illuminance sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101113957A CN101592789B (en) | 2008-05-30 | 2008-05-30 | Automatic glare-shielding control method for liquid crystal sunglasses and control device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101113957A CN101592789B (en) | 2008-05-30 | 2008-05-30 | Automatic glare-shielding control method for liquid crystal sunglasses and control device thereof |
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| CN101592789A CN101592789A (en) | 2009-12-02 |
| CN101592789B true CN101592789B (en) | 2011-01-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104062772B (en) * | 2014-06-30 | 2016-06-01 | 青岛海信电器股份有限公司 | A kind of method and device determining adjustment region, adjustment light transmission rate |
| KR102029188B1 (en) * | 2018-05-06 | 2019-10-07 | 주식회사 스포컴 | Eyewear with adjustable light transmittance |
| CN109828386A (en) * | 2019-02-28 | 2019-05-31 | 王周连 | A kind of darkening eyeglass and automatic beam change driving mirror |
| CN111624789B (en) * | 2020-06-16 | 2021-10-22 | 邯郸市富亚电子技术有限公司 | 0-degree polarized liquid crystal sunglass lens |
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Owner name: BEIJING MINGSONG BOLAI TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: BRIGHTEN OPTICS LTD. Effective date: 20120523 |
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Effective date of registration: 20120523 Address after: 100081 room 9015, building 683, science and technology building, No. 5 South Main Street, Beijing, Haidian District, Zhongguancun Patentee after: Beijing Ming Bo Bo Technology Co., Ltd. Address before: 100081 Room 308, science and technology building, No. 9 South Avenue, Beijing, Haidian District, Zhongguancun Patentee before: Brighten Optics Ltd. |
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