CN106324855A - Projection machine light source and projection machine - Google Patents

Abstract

The invention discloses a projection machine light source, a projection machine and a television. The projection machine light source adopts synthesis light of laser light and fluorescent light as output light. Accordingly, low speckles can be achieved while the wide color gamut is achieved.

Description

Light source of projector and scialyscope

The application is sending out of invention entitled " light source of projector, scialyscope and the television set " of proposition on November 24th, 2010 The divisional application of bright patent application 201080068493.2.

Technical field

The present invention relates to optical field, in particular to a kind of light source of projector and scialyscope.

Background technology

The solid light source such as laser and LED because its energy consumption is low, volume is little, the feature such as life-span length and environmental protection, lead at each Territory the most gradually replaces traditional gas lamp, applies more and more extensive.In projection display applications field, laser and LED throw Shadow system has become the focus of research and development.Various laser and LED and fluorescence light source system continuously occur.While it is true, want Realizing the laser display prominent color representation ability beyond other Display Technique, the image that suppression laser speckle brings simultaneously is made an uproar Sound, still has many difficulties.The particularly green-light source to most critical, as with laser as light source, can realize the function of big colour gamut, but Image speckle noise is serious.If the fluorescence encouraged with short wavelength laser is as light source, speckle noise can eliminate, but color function very office Limit.

For in correlation technique when realizing big colour gamut the speckle phenomena often more serious problem of ratio, the most not yet propose have The solution of effect.

Summary of the invention

For in correlation technique when realizing big colour gamut speckle phenomena often than more serious problem, the present invention is proposed, for This, present invention is primarily targeted at a kind of light source of projector of offer, scialyscope and television set, to solve the problems referred to above.

To achieve these goals, according to an aspect of the invention, it is provided a kind of light source of projector.This projector light Source uses the synthesis light of laser and fluorescence as output light.

To achieve these goals, according to a further aspect in the invention, it is provided that a kind of scialyscope.This scialyscope includes this The light source of projector that invention is provided.

To achieve these goals, according to a further aspect in the invention, it is provided that a kind of television set.This television set includes this The light source of projector that invention is provided.

By the present invention, use the synthesis light of laser and fluorescence as light projector light source, solve in correlation technique Realize speckle phenomena often ratio more serious problem during big colour gamut, and then reach to realize low speckle while realizing big colour gamut Effect.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 a is the schematic diagram of light source of projector according to a first embodiment of the present invention；

Fig. 1 b is the schematic diagram of light source of projector according to a second embodiment of the present invention；

Fig. 1 c is the contrast schematic diagram of laser spectrum and fluorescence spectrum；

Fig. 2 a is the schematic diagram of synthesis light according to a first embodiment of the present invention；

Fig. 2 b is the schematic diagram of synthesis light according to a second embodiment of the present invention；

Fig. 3 a is the design sketch of the colour gamut that synthesized source according to embodiments of the present invention produces；

Fig. 3 b be according to embodiments of the present invention when laser fluorescence than change time, corresponding colour gamut change and speckle contrast The schematic diagram of change；

Fig. 4 is the schematic diagram as excitation light of the employing blue laser according to embodiments of the present invention；

Fig. 5 a is the schematic diagram of a kind of preferred embodiment of the light source of projector according to the present invention；

Fig. 5 b is the schematic diagram of the another kind of preferred embodiment of the light source of projector according to the present invention；

Fig. 5 c is the schematic diagram of the another kind of preferred embodiment of the light source of projector according to the present invention；

Fig. 6 is the schematic diagram of a kind of combination mechanism according to embodiments of the present invention；And

Fig. 7 is the schematic diagram of another kind of combination mechanism according to embodiments of the present invention.

Detailed description of the invention

It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases Combination mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.

Fig. 1 a is the schematic diagram of light source of projector according to a first embodiment of the present invention.

As shown in Figure 1a, this light source of projector uses the synthesis light of laser and fluorescence as output light.

In this embodiment, owing to using laser as light source, it is thus possible to realize big colour gamut, simultaneously because use laser With the synthesis light of fluorescence as output light, thus can be implemented in increase display system colour gamut while reduce the laser of image and dissipate Speckle.

Fig. 1 b is the schematic diagram of light source of projector according to a second embodiment of the present invention；Fig. 1 c is laser spectrum and fluorescence light The contrast schematic diagram of spectrum.

As shown in Figure 1 b, in this embodiment, fluorescence uses excitation to produce, and wherein, this fluorescence can use laser pumping Produce, it would however also be possible to employ LED light excitation produces.The fluorescence produced after laser and excitation is combined to obtain complex light.

First the generation of explanation synthesis light as a example by green-light source.As it can be seen, encourage green with blue light or ultraviolet laser Emitting phosphor, to produce green fluorescence (green fluorescence refers to peak wavelength and the major part light fluorescence at green band), broadband Green fluorescence synthesizes the green light source as scialyscope with the green laser of arrowband again, as illustrated in figure 1 c.

Preferably, in described light source of projector, any one or more employing laser and glimmering in blue light, HONGGUANG, green glow Light compositing, such as, green glow can also can be synthesized by laser and fluorescence by laser and fluorescence synthesis, blue light or HONGGUANG, or Blue light, HONGGUANG, green glow are synthesized by laser and fluorescence, are respectively adopted laser and fluorescence synthesis (example compared to the light of different colours As, blue light be pure laser, green glow be pure fluorescence), the light source of projector of this kind of form is capable of bigger colour gamut.

Fig. 2 a is the schematic diagram of synthesis light according to a first embodiment of the present invention；Fig. 2 b is according to a second embodiment of the present invention Synthesis light schematic diagram.

As shown in Figure 2 a, fluorescence and laser can be by fiber coupler, waveguide coupler synthesis, it is possible to by Free Space Optics Synthesis, as shown in Figure 2 b, two light sources being in adjacent locations can project thing up simultaneously.That is, light source 1 and light source 2, example As, LASER Light Source and the fluorescence light source of LASER Light Source excitation, it is positioned at the side of lens, the light that light source 1 and light source 2 are projected by lens Synthesize.

Preferably, light source of projector according to embodiments of the present invention can include LASER Light Source, fluorescence light source and synthesis Mechanism, wherein, the fluorescence that this combination mechanism produces for the laser producing LASER Light Source and fluorescence light source synthesizes.

Above-mentioned fluorescence light source can include fluorescent material mechanism and excitation light source, and wherein, the light that excitation light source sends is via glimmering Fluorescence is produced after Guang Fen mechanism.

Fluorescent material mechanism can include colour wheel and/or overlaying mechanism, wherein, includes the situation of colour wheel in fluorescent material mechanism Under, the zones of different at colour wheel scribbles the fluorescent material of different colours；In the case of fluorescent material mechanism includes overlaying mechanism, its In, the different layers at overlaying mechanism scribbles the fluorescent material of different colours.

Above-mentioned excitation light source both can be LASER Light Source, it is also possible to for LED light source.

Combination mechanism includes any one in fiber coupler, waveguide coupler and lens or multiple.

Fig. 3 a is the design sketch of the colour gamut that synthesized source according to embodiments of the present invention produces.

The effect produced via Fig. 1 a to Fig. 1 c synthesized source can be shown by colour triangle, as shown in Figure 3 a, and triangle ABC represents the expressible colour gamut of red (laser)-green (fluorescence)-indigo plant (laser) three-color light source, owing to phosphor wavelength band is roomy, Green light color sits the close center of B mark, and colour triangle area is little, and expressible color is few.

After adding green laser composition, green light color coordinate D is away from center, and colour triangle ADC area is bigger, can show Color be greatly increased.

Blue light and HONGGUANG can be produced in fashion described above, i.e. blue light, HONGGUANG use laser and fluorescence to be combined to.Because it is each Coloured light color domain triangle size is different with speckle effect, synthesizes green-light source in fashion described above, and effect is the most obvious, can With while increasing gamut area, suppress speckle.

The mode of above-mentioned synthetic laser and fluorescence provides the means optimizing light source color saturation.

As shown in AEC in Fig. 3 a, this kind of situation is the situation using laser completely, although it can be seen that completely Use laser can obtain the colour gamut of maximum, but in that case, there will be speckle equally than more serious situation.That is, If pure laser is light source, green light color coordinate can be on the border of whole colour gamut, and colour triangle area can be bigger, but pure sharp Radiant can bring serious laser coherence speckle, affects image quality.

Comprehensive any of the above situation it can be seen that when being ADC for colour triangle be in the present invention to fluorescence and Laser carries out the optimum way synthesized, and in that case, both can obtain bigger colour gamut, and can be greatly reduced again scattered Speckle.

Now Fig. 3 a is done further quantitative description.For describing colour gamut size, we must obtain the chromatic stimulus of light source Value, such as:

$X=\underset{0}{\overset{\mathrm{\∞}}{\∫}}I\left(\mathrm{\λ}\right)\stackrel{\‾}{x}\left(\mathrm{\λ}\right)d\mathrm{\λ}$

$Y=\underset{0}{\overset{\mathrm{\∞}}{\∫}}I\left(\mathrm{\λ}\right)\stackrel{\‾}{y}\left(\mathrm{\λ}\right)d\mathrm{\λ}$

$Z=\underset{0}{\overset{\mathrm{\∞}}{\∫}}I\left(\mathrm{\λ}\right)\stackrel{\‾}{z}\left(\mathrm{\λ}\right)d\mathrm{\λ}$

Wherein I (λ) is light source light spectrum distribution.It it is standard stimulus curve.At xy color space, chromaticity coordinates is:

$x=\frac{X}{X+Y+Z}$

$y=\frac{Y}{X+Y+Z}$

Z=1-x-y

Xy coordinate according to RGB light source, can calculate the size of colour triangle.

For quantitative description speckle, it is provided with uniform light intense irradiation to screen, due to the coherence of laser, screen reflection or throwing The light intensity penetrated produces inhomogeneities (i.e. speckle), and picture light distribution is p (I) (p is the probability of intensity I), then speckle contrast The definition of degree is:

$C=\frac{{\mathrm{\σ}}_I}{\stackrel{\‾}{I}}$

Wherein,For light intensity meansigma methods, σ_IFor standard deviation.Can be calculated by p (I) both this.Strictly to calculate reality The p (I) of projection system screen, theoretical extremely complex.Stress now light source discussion.To conventional Solid State Laser, its spectrum is very Narrow, perfectly correlated light can be approximately, its Speckle Intensity Probability Distribution is negative exponential function:

$p_1\left(I\right)=\frac{1}{\stackrel{\‾}{I}}\exp (-I/\stackrel{\‾}{I})$

To fluorescence light source, due to the non-constant width of spectrum, can be approximately complete irrelevant light, its Speckle Intensity Probability Distribution is δ Function:

p₂(I)=δ (I)

According to distribution function p1, p2 and LASER Light Source and fluorescence light source mixed proportion, we can get the light of synthesized source Strong distribution function, and then obtain speckle contrast.

Fig. 3 b is the result of calculation of Fig. 3 a example.Here blue light uses laser LD, and HONGGUANG uses LED, blue light and HONGGUANG Chromaticity coordinates is respectively (0.1813,0.0818), (0.6190,0.3521).Green glow uses Solid State Laser and the mixing of fluorescence.Solid The centre wavelength of laser is 532nm, carries a width of 0.1nm.Fluorescence centre wavelength is 532nm, carries a width of 80nm.

Fig. 3 b is when green laser fluorescence is than change, the change of corresponding colour gamut and speckle contrast change.Song in figure Line A represents speckle contrast, we can observe that when fluorescent component increases to about 60% from 0, and speckle contrast reduces, 60～90% contrast decline inconspicuous, crossed 90% right continue decline.Such change behavior is to be divided by quantum condition entropy and δ The synthesis of cloth causes.Curve B is relative area (i.e. colour gamut when colour triangle area and pure green-emitting fluorescent of colour triangle The ratio of triangle area), it may be seen that when fluorescent component increases, colour gamut diminishes.

For reducing the purpose of the design of speckle contrast and increase colour gamut, about 60% fluorescent component is maximally efficient.At this moment dissipate Speckle contrast is reduced to 27% by the 100% of pure LASER Light Source, and the pure fluorescence light source of xy space gamut area ratio adds simultaneously 32%.It is pointed out that gamut area is carried out in xy color gamut space, due to xy space in order to calculate simple reason Heterogeneity can underestimate colour gamut to be increased, and actual colour gamut face increases can be higher.The colour gamut of fluorescence light source is the least, and color saturation is low, Being only suitable for some commercial projection application, by laser and the mixing of fluorescence, the colour gamut after increase can meet the amusements such as home theater The demand of application.It addition, speckle contrast about must little just be not aware of to 5% human eye.Assume the complete of light source in this instance Being concerned with, in systems in practice due to the employing of laser array, the various random device in system and process, even if not mixing glimmering Light, laser is not the most completely coherent light, and speckle contrast is not 100%, different according to optical system, can be little to 15-20%.Logical Cross the laser of the present invention and fluorescence mixing, be speckle contrast can be reduced to 5% degree.

Fig. 4 is the wavelength schematic diagram as excitation light of the employing blue laser according to embodiments of the present invention.

When with blue laser for excitation light, the mode that can design fluorescent excitation only makes some blue light be converted to green glow.This The remaining blue light of sample can be as blue light source.

In light source of projector, it is preferable that laser and fluorescence one of in the following ways synthesis: to red laser, green glow Laser and the first fluorescence synthesize, and wherein, the first fluorescence is blue excitation light stimulus red light fluorescent powder and green light fluorescent powder product Raw fluorescence；Or, the light, green laser and the second fluorescence that send red-light LED synthesize, and wherein, the second fluorescence is blue The fluorescence that light stimulus light stimulus green light fluorescent powder produces.I.e., in above-mentioned light source of projector, described laser can include HONGGUANG Laser and green laser, described fluorescence be by blue laser excitation red light fluorescent powder and green light fluorescent powder produce first glimmering Light, or, described light source of projector also includes that the light that red-light LED sends, described laser include that green laser, described fluorescence are served as reasons Blue laser excitation green light fluorescent powder and the second fluorescence of producing.

Fig. 5 a is the schematic diagram of a kind of preferred embodiment of the light source of projector according to the present invention.

As shown in Figure 5 a, with blue laser excitation red light fluorescent powder and green light fluorescent powder again with red laser and green laser Mixing, can thus can be made into, as blue light source, the redgreenblue light source that color saturation optimizes with remaining blue light, from And reach big colour gamut, the effect of low speckle.

Fig. 5 b is the schematic diagram of the another kind of preferred embodiment of the light source of projector according to the present invention.

In actual applications, different according to applicable cases, red-light source also can be replaced by LED, as shown in Figure 5 b, encourages light It can also be LED light source.Such as, as a example by red-light LED, utilize light, green laser and blue excitation light pair that red-light LED produces The light produced after the excitation of green fluorescence powder synthesizes, using the complex light after synthesis as light source.

Fig. 5 c is the schematic diagram of the another kind of preferred embodiment of the light source of projector according to the present invention.

As shown in Figure 5 c, in this embodiment, employing ultraviolet light is as excitation light, owing to using ultraviolet light to enter fluorescent material During row energization, both can produce the fluorescence of green glow, it is also possible to produce the fluorescence of HONGGUANG or produce the fluorescence of blue light, thus at this In the case of Zhong, so that the selection of LASER Light Source is the most flexible, it should be noted that as the ultraviolet source of excitation light source Both can be LASER Light Source, it is also possible to be LED light source, meanwhile, light source 1 and light source 2 in figure can be LASER Light Source, permissible One is LASER Light Source, and another is LED light source.

As it can be seen, after using ultraviolet light to produce fluorescence as excitation light, it is possible to use this fluorescence and LASER Light Source The laser produced is combined to, it is possible to use laser and the light of LED light source generation that this fluorescence produces with LASER Light Source are combined to.

In summary it can be seen, when using ultraviolet light as excitation light, owing to using ultraviolet light can produce as excitation light The fluorescence of any one color in raw green glow, blue light and HONGGUANG, thus to LASER Light Source and the generation producing laser The selection of the excitation light source of fluorescence is the most flexible.

Fig. 6 is the schematic diagram of a kind of combination mechanism according to embodiments of the present invention；And Fig. 7 is according to embodiments of the present invention The schematic diagram of a kind of combination mechanism.

Fig. 6 and Fig. 7 shows the different modes producing fluorescence.Fig. 6 uses the mode of colour wheel, the most homochromy fluorescent material to be coated in The zones of different of colour wheel.Fig. 7 uses the mode of phosphor powder layer superposition, and the most homochromy fluorescent material is successively coated in same place.Wherein In figure 6, the figure a correspondence ultraviolet light in Fig. 6, as the situation of excitation light source, at this moment can produce red, green, blue fluorescence；In Fig. 6 Figure b correspondence blue light, as the situation (situation of corresponding diagram 5a) of excitation light source, at this moment can produce red, green fluorescence, and blue light will pass through Transparent colour wheel part, the blue light as excitation light source can be directly used as blue light source by Journalistic；Figure c corresponding diagram 5c in Fig. 6 Situation, at this moment HONGGUANG is produced by LED, only need to produce green-emitting fluorescent.

This fluorescence uses reflection mode or mode of delivery to produce.

The embodiment of the present invention additionally provides a kind of scialyscope, and this scialyscope has the throwing described in any one embodiment above-mentioned Shadow machine light source.

Specifically, this scialyscope can include light source of projector, micro-display, and wherein, light source of projector is used for exporting conjunction Cheng Guang；Micro-display, for being modulated the synthesis light of light source of projector output.

In this embodiment, owing to have employed polarized light source, and utilize 3D signal to polarized light by micro-display It is modulated, and the polarized light after modulation is projected, it is possible to achieve stereoprojection.

Above-mentioned scialyscope according to embodiments of the present invention can be divided into pre-projecting type, it is also possible to is back projection type, wherein, and front throwing Screen is reflective, and the screen of rear-projection is projection-type.

The embodiment of the present invention additionally provides a kind of television set, and this television set has the throwing described in any one embodiment above-mentioned Shadow machine light source.

Television set is as display device, and its signal source mostlys come from antenna and cable television channels.And scialyscope conduct Display device, signal source is essentially from DVD, blue light (Blu-Ray) and computer etc..But, due to the appearance of Set Top Box, TV Also can play the film source from DVD, Blu-Ray etc., scialyscope also can also can play the film source from television channel.

Scialyscope according to embodiments of the present invention is thrown and two kinds of forms of rear-projection before can being divided into, for the scialyscope of rear-projection, screen Curtain and scialyscope integration, built-in Set Top Box, it is thus possible to receive and process TV signal, also may act as according to the present invention real Execute the television set of example.For the scialyscope of front throwing, screen separates with scialyscope, typically without Set Top Box.Wherein, the guarantor of front throwing is inclined Screen is reflective, and the inclined screen of guarantor of rear-projection is projection-type.

As can be seen from the above description, present invention achieves following technique effect:

The present invention considers laser, fluorescence and the LED synthesis application in Projection Display, thus realizes big colour gamut and low dissipate The display effect of speckle；

The comprehensive laser of the present invention and the advantage of fluorescence, it is proposed that the fluorescence of a kind of laser and laser pumping is simultaneously used as Light source, it is achieved the laser projection display effect of the big the lowest speckle of colour gamut；

By utilizing the synthesis light of the fluorescence of laser and laser generation as light source of projector, it is provided that a new big color Territory and low speckle laser display scheme.The program can realize the coloury advantage of laser display, overcomes laser display the most simultaneously Big performance deficiency laser speckle.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (11)

1. light source of projector, it is characterised in that include LASER Light Source, described LASER Light Source include blue laser, red laser and Green laser；

And, fluorescence light source, described fluorescence light source includes fluorescent material mechanism and excitation light source, and described fluorescent material mechanism scribbles HONGGUANG Fluorescent material and green light fluorescent powder, the light that described excitation light source sends is via producing HONGGUANG fluorescence and green glow after described fluorescent material mechanism Fluorescence；

Combination mechanism, the fluorescence produced for the laser producing described LASER Light Source and described fluorescence light source synthesizes.

Light source of projector the most according to claim 1, it is characterised in that described fluorescent material mechanism is colour wheel, at described color The zones of different of wheel scribbles the fluorescent material of different colours, and described fluorescent material includes red light fluorescent powder and green light fluorescent powder.

Light source of projector the most according to claim 2, it is characterised in that described excitation light source is blue laser, described color Wheel also includes transparent part, and the described blue laser of part is used as blue light source by the transparent part projection of described colour wheel.

Light source of projector the most according to claim 2, it is characterised in that described fluorescent material also includes blue light fluorescent powder, institute Stating excitation light source is ultraviolet source.

Light source of projector the most according to claim 1, it is characterised in that described fluorescent material mechanism is overlaying mechanism, wherein, Different layers at described overlaying mechanism scribbles the fluorescent material of different colours, and described fluorescent material includes red light fluorescent powder and green-emitting fluorescent Powder.

Light source of projector the most according to claim 5, it is characterised in that described fluorescent material also includes blue light fluorescent powder, institute Stating excitation light source is ultraviolet source.

Light source of projector the most according to claim 1, it is characterised in that described HONGGUANG fluorescent component accounts for described red laser With described HONGGUANG fluorescence 60%；And/or,

Described green-emitting fluorescent composition accounts for described green laser and the 60% of described green-emitting fluorescent.

8. according to the light source of projector described in claim 4 or 6, it is characterised in that described blue phosphor composition accounts for described blue light Laser and the 60% of described blue phosphor.

Light source of projector the most according to claim 1, it is characterised in that described combination mechanism includes one below or any Multiple: fiber coupler, waveguide coupler and lens.

Light source of projector the most according to claim 1, it is characterised in that described fluorescence uses reflection mode or projection Mode produces.

11. 1 kinds of scialyscopes, it is characterised in that there is the light source of projector according to any one of claim 1 to 10.