Summary of the invention
To solve the technical issues of existing projection device blue light damages human eye, the present invention, which provides one kind, can improve indigo plantThe projection device of light injury caused by human eye, has first mode and second mode, and the projection device includes: light source dressIt sets, for issuing light source light, the light source light includes blue light and other color of light；And spatial light modulator, for according to figureAs data modulate the light source light to generate image light, wherein the light supply apparatus is in second mode in the projection deviceWhen the luminous flux of other color of light that issues compared to the light supply apparatus when the projection device is in first modeThe luminous flux of other color of light issued is big, and when the projection device is in second mode, other described color of lightOther color of light described in being greater than in the luminous flux accounting in the light source light when the projection device is in first mode are in instituteState the luminous flux accounting in light source light.
In one embodiment, other described color of light include the first color of light, and the light supply apparatus is in the projectionThe luminous flux that equipment is in first color of light issued when second mode is set compared to the light supply apparatus in the projectionIt is big for the luminous flux for being in first color of light issued when first mode.
In one embodiment, the relative luminous efficiency of the peak wavelength of first color of light is greater than describedThe relative luminous efficiency of the peak wavelength of blue light.
In one embodiment, other described color of light include the second color of light, and the light supply apparatus is in the projectionThe luminous flux that equipment is in second color of light issued when second mode is set compared to the light supply apparatus in the projectionThe luminous flux of standby second color of light issued when being in first mode is big, wherein first color of light be red light andSecond color of light is green light or first color of light is green light and second color is red light.
In one embodiment, the indigo plant that the light supply apparatus is issued when the projection device is in second modeThe luminous flux of coloured light is compared to the blue light that the light supply apparatus is issued when the projection device is in first modeLuminous flux is small.
In one embodiment, the indigo plant that the light supply apparatus is issued when the projection device is in second modeThe optical power density peak value of coloured light and the optical power density peak value ratio of first color of light or second color of light are comparedIn the light supply apparatus when the projection device is in first mode the optical power density peak value of the blue light and described theThe optical power density peak value ratio of one color of light or second color of light is small.
In one embodiment, the projection device further includes light source drive, and the light source drive is for issuingDriving signal controls the driving current of the light supply apparatus, so that other described color of light that the light supply apparatus issues are controlled,Wherein the driving current of the light supply apparatus includes controlling the first driving current and control first color of the blue lightSecond driving current of light.
In one embodiment, first drive of the light supply apparatus when the projection device is in second modeThe current value of streaming current is less than first driving current of the light supply apparatus when the projection device is in first modeCurrent value；Or the pulse of first driving current of the light supply apparatus when the projection device is in second modeWidth is less than the pulse width of first driving current of the light supply apparatus when the projection device is in first mode.
In one embodiment, second drive of the light supply apparatus when the projection device is in second modeThe current value of streaming current is greater than second driving current of the light supply apparatus when the projection device is in first modeCurrent value；Or the pulse of second driving current of the light supply apparatus when the projection device is in second modeWidth is greater than the pulse width of second driving current of the light supply apparatus when the projection device is in first mode.
In one embodiment, the projection device further includes secondary light source, for issuing auxiliary coloured light, the auxiliaryColoured light is non-blue light；When the projection device is in first mode, the secondary light source is not turned on, when the projection deviceWhen in second mode, the secondary light source is opened.
In one embodiment, the auxiliary coloured light and first color of light belong to same a shade, and the auxiliaryThe spectrum halfwidth of coloured light is not more than 20nm.
In one embodiment, when the projection device is in second mode, the blue light is in the light source lightPower accounting less than 20%, the optical power density peak value of the optical power density peak values of other color of light and the blue lightRatio be more than or equal to 50%.
Compared with prior art, in projection device of the invention, projection device has second mode and first mode twoKind mode, under the second mode, luminous flux accounting of other color of light of non-blue in light source light improve, and make light supply apparatusThe luminous flux of other color of light issued increases, since human eye waits other color of light more sensitive to yellowish green, when other faceWhen coloured light luminous flux relative blueness light is higher, human eye can carry out self automatically by defense mechanisms such as pupil contraction or blinks and protectShield, and then when showing same picture, enter human eye compared to first mode in the blue light that second mode enters human eyeBlue light is less, so as to achieve the purpose that eyeshield.
Specific embodiment
Referring to Fig. 3, Fig. 3 is the structural schematic diagram of the projection device 100 of a better embodiment of the invention.The projectionEquipment 100 includes light supply apparatus 110, light source drive 120, spatial light modulator 130 and camera lens 140.The projection device100 have first mode and second mode both of which at work.It is appreciated that the first mode and second mode are cutThe interface operation menu that mechanical key or the projection device 100 are shown can be operated by user to realize, herein by changingWithout repeating.Wherein, first mode can be normal mode, i.e. general display mode, and second mode is eyeshield mode, i.e., notIt is same as the mode of normal mode and the protection of advantageous human eye.
For light supply apparatus 110 for issuing light source light, the light source light includes blue light and other color of light, other described faceColoured light is for example including the first color of light and the second color of light.The light supply apparatus 110 is in the second mould in the projection device 100The luminous flux of other color of light issued when formula is in the in the projection device 100 compared to the light supply apparatus 110The luminous flux of other color of light issued when one mode is big, and when projection device 100 is in second mode, other colorsLuminous flux accounting of the light in light source light be greater than when projection device 100 is in first mode other color of light in light source lightLuminous flux accounting.
In the first embodiment, what the light supply apparatus 110 was issued when the projection device 100 is in second modeThe luminous flux of first color of light is sent out compared to the light supply apparatus 110 when the projection device 100 is in first modeThe luminous flux of first color of light out is big.Emergent light when specifically, by full white image is tested, light supply apparatusThe optical power density peak value (or illumination peak value) of 110 the first color of light issued when projection device 100 is in second modeThe peak value of the first color of light issued when projection device 100 is in first mode compared to light supply apparatus 110 is big.
In second of embodiment, what the light supply apparatus 110 was issued when the projection device 100 is in second modeThe luminous flux of second color of light is sent out compared to the light supply apparatus 110 when the projection device 100 is in first modeThe luminous flux of second color of light out is big.Specifically, light supply apparatus 110 is sent out when projection device 100 is in second modeThe optical power density peak value of the second color of light out is sent out compared to light supply apparatus 110 when projection device 100 is in first modeThe optical power density peak value of the second color of light out is big.
In the third embodiment, the first color that light supply apparatus 110 is issued when projection device 100 is in second modeThe luminous flux of light is logical compared to the light for the first color of light that light supply apparatus 110 is issued when projection device 100 is in first modeAmount is big.Also, the luminous flux for the second color of light that light supply apparatus 110 is issued when projection device 100 is in second mode is comparedIt is big in the luminous flux for the second color of light that light supply apparatus 110 is issued when projection device 100 is in first mode.
In addition, in above-mentioned three kinds of embodiments, what light supply apparatus 110 was issued when projection device 100 is in second modeThe luminous flux of blue light can be less than or equal to the blue that the light supply apparatus is issued when projection device 100 is in first modeThe luminous flux of light.Especially in one embodiment, the blue light that projection device issues under the second mode is reduced, thus directlyReduce the luminous flux into the blue light of human eye, plays eye-protecting function.Specifically, light supply apparatus 110 is in projection device 100The optical power density peak of the optical power density peak value of the blue light issued when second mode and the first color of light or the second color of lightBe worth ratio compared to light supply apparatus 110 the optical power density peak value of blue light and the when projection device 100 is in first modeThe optical power density peak value ratio of one color of light or the second color of light is small.
Certainly, blue light is also not necessarily reduced under the second mode, for example, in an other embodiments, light source dressThe blue light for setting sending is increased slightly relative to first mode under the second mode, but still maintains that projection device is made to be in secondWhen mode, luminous flux accounting of other color of light in light source light is greater than other color of light when projection device is in first modeLuminous flux accounting in light source light, although that is, blue light total amount be increased slightly, the decline of the accounting of blue light.The skillUnder art scheme, remained to by the triggering of human eye biological protection mechanism caused by other color of light increases so that into blue lightTotal amount is reduced, to play the function of eyeshield.
In an embodiment of the invention, the relative luminous efficiency of the peak wavelength of the first color of light is greater thanThe relative luminous efficiency of the peak wavelength of blue light.I other words the first color of light of isodose relative to blue light moreIt is easy the feeling for making one to generate " bright ".Under the technical solution, by increasing the luminous flux of the first color of light in second mode, so thatThe light that human eye obviously feels that projection device issues brightens, so that pupil etc. is shunk automatically, to reduce the total light flux for entering human eye,The total light flux into human eye is made to remain unchanged as far as possible.Since the specific gravity that blue light accounts for reduces, then entering the indigo plant of human eyeLight decreases, so that human eye be protected not injured by blue light.
In an embodiment of the invention, the relative luminous efficiency of the peak wavelength of the first color of light is greater than10 times of the relative luminous efficiency of the peak wavelength of blue light, enabling feels human eye when increasing by the first color of lightIncrease to brightness obvious.
It is appreciated that the first color of light can be red light and the second color of light can be green light, but it is real in changeIt applies in mode, the first color of light can be green light and the second color can be red light.First color of light and the second color of lightAlso red light or green light are not limited to, or the colour mixtures light such as sodium yellow, Exocarpium Citri Rubrum coloured light.
Further, in present embodiment, light source drive 120 is used to issue driving signal control light supply apparatus 110Driving current, to control the first color of light and the second color of light of the sending of light supply apparatus 110, the wherein drive of light supply apparatus 110Streaming current includes the first driving current I for controlling blue light1, control the first color of light the second driving current I2And control secondThe third driving current I of color of light3, so that it is close to control blue light, the luminous flux of the first color of light and the second color of light, optical powerSpend peak value etc..It is appreciated that issuing blue excitation light using blue excitation light source in light supply apparatus 110 carrys out excitated fluorescent powder generationWhen other color of light, the second driving current I2Actually drive the driving current of blue excitation light source, third driving current I3?It is the driving current for actually driving blue excitation light source, in addition, the sending of blue excitation light source also can be used in blue lightA part of blue excitation light, therefore, the first driving current I1It can be the blu-ray drives electric current of driving blue excitation light source.ButIt is in another embodiment, to be such as emitted in outer light using burst of ultraviolel light source in light supply apparatus 110 come excitated fluorescent powder productionRaw blue light and other color of light, first, second and third driving current I1, I2, I3It can be respectively driving uv excitation lightThe ultraviolet light driving current in source.
Specifically, in the first above-mentioned embodiment, light supply apparatus 110 is when projection device 100 is in second modeSecond driving current I2Current value can be greater than light supply apparatus 110 when projection device 100 be in first mode second driveStreaming current I2Current value.In a kind of change embodiment of the first above-mentioned embodiment, light supply apparatus 110 is in projection device100 are in the second driving current I when second mode2Pulse width be greater than light supply apparatus 110 and be in the in projection device 100The second driving current I when one mode2Pulse width.
In above-mentioned second of embodiment, third driving of the light supply apparatus 110 when projection device 100 is in second modeElectric current I3Current value can be greater than third driving current I of the light supply apparatus 110 when projection device 100 is in first mode3'sCurrent value.In a kind of change embodiment of the first above-mentioned embodiment, light supply apparatus 110 is in second in projection device 100Third driving current I when mode3Pulse width be greater than light supply apparatus 110 when projection device 100 is in first modeThird driving current I3Pulse width.
Referring to Fig. 4, Fig. 4 is the driving current wave of each color of light of the third embodiment of projection device 100 shown in Fig. 3Shape figure.In the third embodiment, second driving current I of the light supply apparatus 110 when projection device 100 is in second mode2Current value can be greater than second driving current I of the light supply apparatus 110 when projection device 100 is in first mode2Electric currentValue, and third driving current I of the light supply apparatus 110 when projection device 100 is in second mode3Current value can be greater thanThird driving current I of the light supply apparatus 110 when projection device 100 is in first mode3Current value.At this point, light supply apparatus110 the first driving current I when projection device 100 is in second mode1Current value can be equal to light supply apparatus 110 throwShadow equipment 100 is in the first driving current I when first mode1Current value,
Referring to Fig. 5, Fig. 5 is a kind of each color of change embodiment of projection device 100 shown in Fig. 3 the third embodimentThe drive current waveform figure of light.In a kind of change embodiment of the third embodiment, light supply apparatus 110 is in projection device 100The second driving current I when in second mode2Pulse width be greater than light supply apparatus 110 projection device 100 be in firstThe second driving current I when mode2Pulse width, and light supply apparatus 110 is when projection device 100 is in second modeThird driving current I3Pulse width be greater than third of the light supply apparatus 110 when projection device 100 be in first mode and driveElectric current I3Pulse width.At this point, first driving current I of the light supply apparatus 110 when projection device 100 is in second mode1'sPulse width is equal to first driving current I of the light supply apparatus 110 when projection device 100 is in first mode1Pulse width.
It is appreciated that as shown in fig. 6, light supply apparatus 110 is being thrown in a kind of change embodiment of embodiment shown in Fig. 4Shadow equipment 100 is in the first driving current I when second mode1Current value might be less that light supply apparatus 110 is set in projectionStandby 100 are in the first driving current I when first mode1Current value.Alternatively, as shown in fig. 7, embodiment shown in Fig. 5In a kind of change embodiment, first driving current I of the light supply apparatus 110 when projection device 100 is in second mode1PulseWidth might be less that first driving current I of the light supply apparatus 110 when projection device 100 is in first mode1Pulse it is wideDegree.
In an embodiment of the invention, driving signal going out to light supply apparatus 110 is issued by light source drive 120Light is controlled, when projection device 100 can be made to be in second mode, power accounting of the blue light in light source light less than 20%,The ratio of the optical power density peak value of the optical power density peak value and blue light of other color of light is more than or equal to 50%.The blue light accounts forThan under, the light that projection device issues to the injury of human eye within the acceptable range.
In an embodiment of the invention, projection device further includes secondary light source, for issuing auxiliary coloured light, auxiliaryColoured light is non-blue light, and when projection device is in first mode, secondary light source is not turned on, when projection device is in second modeWhen, secondary light source is opened.Under the technical solution, do not need light source be filled by the driving current for adjusting light supply apparatusThe work set is more stable.
In one embodiment, secondary light source is the light source independently of light supply apparatus, can individually be controlled.It can be withUnderstand, secondary light source can also become one with light supply apparatus.
In one embodiment, secondary light source can be self-existent green laser and/or red laser, useIn outgoing green light and/or feux rouges, especially under the technical solution, green light and/or feux rouges as laser have narrower spectrum,The optical power density peak power density of non-blue light can be significantly improved.In one embodiment, coloured light and the first face are assistedColoured light belongs to same a shade, and assisting coloured light is narrow spectral light, and spectrum halfwidth is not more than 20nm, can obviously increase human eyeBright feeling.
Spatial light modulator 130 is for image data modulated light source light to generate image light.140 reception space light tune of camera lensImage light that device 130 processed generates and project image light to predetermined position or predetermined element (such as projection screen or wall) is shownShow projected image.
Spatial light modulator 130 can be it is one chip, two-piece type or three-chip type, when for the spatial light tune of one chipWhen device processed, red, green, blue three coloured light timing enters spatial light modulator, and spatial light modulator timing modulation is emitted three kinds of colorsLight；When for the spatial light modulator of two-piece type, a spatial light modulator modulation blue light and the second color of light can be, separatelyOne spatial light modulator modulates the first color of light；When for the spatial light modulator of three-chip type, red, green, blue three coloured light differenceInto three spatial light modulators, the light of three kinds of colors does not need a point timing modulation.Spatial light modulator 130 can be DMD,LCD etc..
According to foregoing description it is found that by controlling the luminous flux of other color of light and blue light under two modes, so thatThe luminous flux for other color of light that light supply apparatus 110 is issued when projection device 100 is in second mode is compared to light supply apparatusThe luminous flux of 110 other color of light issued when projection device 100 is in first mode is big, and then light supply apparatus 110 is being thrownShadow equipment 100 is in power accounting of the blue light issued when second mode in light source light, is throwing compared to light supply apparatus 110It is small that shadow equipment 100 is in power accounting of the blue light issued when first mode in light source light, and then is conducive in the second mouldThe protection to human eye is realized when formula.
Specifically, further, referring to Fig. 8, Fig. 8 is photopic vision servant's eye spectral luminous efficiency curve graph.Human eyeThe luminous flux of human eye can be entered by the size of adjusting pupil, automatic adjustment.Since human eye is insensitive to blue light, work as lightIt composes after improving blue light accounting in ingredient, human eye does not become clear, and pupil is less shunk, and can not pass through the defence machine such as blinkSystem protection eyes.And human eye is more sensitive to other color of light such as green light and sodium yellow, when other color of light in increase spectrumWhen (including the second color of light and first color of light) accounting, eyes can obviously become clear, and human eye can pass through pupil contraction at this timeOr the defense mechanism of blink, to protect eyes.Specifically, human eye can be treated as into camera lens, according to as plane objectMirror illumination formula 1, D is equivalent to pupil of human, when the brightness of object improves (due to the increase of non-blue spectrum ingredient), it is desirable toConstant in the brightness value of retina, human eye can reduce pupil diameter, to realize the illumination for entering human eye in luminance raisingConstant purpose, and the blue light accounting in spectrum is reduced to 20% hereinafter, therefore into the blue light of human eye relative to just at this timeNorm formula is significantly reduced, to achieve the purpose that protect eyes.
According to above-mentioned principle it is found that in projection device 100, under the second mode, the light function of blue light and other color of lightBlue light and the optical power density peak value ratio of other color of light are small when rate density peaks ratio is compared to first mode, due to peopleEye is more sensitive to yellowish green red other color of light of grade, when other color of light optical power density peak value relative blueness light are higher, peopleEye can carry out self-protection automatically by defense mechanisms such as pupil contraction or blinks, and then when showing same picture, theThe blue light that two modes enter human eye is less compared to the blue light that first mode enters human eye, can achieve the purpose of eyeshield.
Further, referring to Fig. 9, Fig. 9 is the normalizing of the light supply apparatus of projection device of the present invention under the second modeChange spectral schematic.The light source of projection device of the present invention, which is sitting in normalization spectral schematic in the flrst mode, may refer to figure2.Pass through comparison, it is found that the accounting and peak value of other color of light all increase.In present embodiment, driven by light sourceDynamic device 120 issues driving signal and controls the light that goes out of light supply apparatus 110, when projection device 100 can be made to be in second mode,Power accounting of the blue light in light source light is less than 20%, the optical power density peak value of other color of light and the optical power of blue lightThe ratio of density peaks is more than or equal to 50%, to reach preferable eyeshield effect.
To sum up, compared to the prior art, projection device 100 of the invention has two kinds of moulds of second mode and first modeFormula, under the second mode, the luminous flux for other color of light that light supply apparatus issues are larger, especially blue light and other color of lightOptical power density peak value ratio compared to first mode when blue light and the optical power density peak value ratio of other color of light it is small,Since human eye is more sensitive to other yellowish green equal color of light, when other color of light optical power density peak value relative blueness light are higherWhen, human eye can carry out self-protection automatically by defense mechanisms such as pupil contraction or blinks, and then when showing same picture,It is less compared to the blue light that first mode enters human eye in the blue light that second mode enters human eye, it can achieve the mesh of eyeshield's.
The above is only embodiments of the present invention, are not intended to limit the scope of the invention, all to utilize the present inventionEquivalent structure or equivalent flow shift made by specification and accompanying drawing content is applied directly or indirectly in other relevant technologiesField is included within the scope of the present invention.