CN101325722A - Back projection device - Google Patents
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- CN101325722A CN101325722A CNA2008101106991A CN200810110699A CN101325722A CN 101325722 A CN101325722 A CN 101325722A CN A2008101106991 A CNA2008101106991 A CN A2008101106991A CN 200810110699 A CN200810110699 A CN 200810110699A CN 101325722 A CN101325722 A CN 101325722A
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Abstract
The invention relates to a back-projection device, comprising a light source; a plurality of color filters that make the light from the light source penetrate to orderly emit red light, green light, and blue light; a light modulation unit for modulating the red light, green light, and blue light that penetrate the color filter by using image signal; a projection lens for projecting the modulated light onto the screen; and a light measuring unit, arranged on the light path between the projection path and the screen, that deviates from the focus of the emitted light of the projection lens, for measuring the red, green, and blue light emitted from the projection lens. The invention provides a back projection device capable of adjusting image precisely.
Description
Technical field
The present invention relates to a kind of back projection device, particularly a kind of by making up rear-projection (rear projector) device that a plurality of pictures constitute the rear projection of a big picture.
Background technology
Recently, a kind of watch-dog that is used for showing the big picture of traffic has been used in traffic control centers etc., but what the big picture watch-dog of this kind used is, makes up many picture display devices (multi display device) that the back projection device of a plurality of rear projections forms.
Back projection device is that the light that will penetrate from light source projects on RGB (red, green, blue) the transmission-type colored filter (color filter) successively, to obtain each coloured light of RGB (red, green, blue), and use Digital Micromirror Device (Digital Micromirror Device, DMD), with the pixel is that unit reflexes to described each coloured light on the screen (screen), form coloured image whereby, and make up a plurality of such back projection devices and constitute many picture display devices with a big picture.
Yet when a plurality of such back projection devices of combination formed a big picture, because of the individual difference of employed light source or optical element in each back projection device, the brightness of the coloured image that forms in each back projection device or color can be inconsistent sometimes.That is to say, if the transmissivity of optical elements such as the brightness of the light source in each back projection device or colored filter is variant, so, the brightness of the picture of each back projection device or color are different sometimes, when constituting a picture by these back projection devices, the problem that exists integral image can become very fuzzy.
Therefore, in the past, as described in Japanese patent laid-open 6-217336 communique, those skilled in the art have considered following method: when a plurality of displays of combination constitute a picture, utilize video camera to take the picture of each display, according to the data that video camera thus obtains, control the magnification ratio or the gamma correction (gamma correction) of the pairing signal of video signal of each display, make the white balance (white balance) and the gamma characteristic unanimity of all displays whereby.
Yet, in the method for described Japanese patent laid-open 6-217336 communique, take picture shown on the display because need utilize video camera, and in the determination data of video camera output, contain a large amount of clutters (noise) on the display picture etc., so there is following problem, that is, be difficult for obtaining high-precision data, and can't regulate the picture of each display exactly.
This shows that above-mentioned existing back projection device obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of back projection device of new structure, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing back projection device exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of back projection device of new structure, can improve general existing back projection device, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
The objective of the invention is to, overcome the defective that existing back projection device exists, and provide a kind of back projection device of new structure, technical problem to be solved to be, a kind of back projection device that picture is regulated that can carry out accurately is provided, be very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of back projection device that the present invention proposes, it comprises: light source; A plurality of colored filters make the light transmission that sends from described light source, and penetrate each coloured light of RGB successively; Light-modulating cell utilizes picture signal to come each coloured light of RGB that sees through described colored filter is modulated; Projection lens will project on the screen through the light after the described light-modulating cell modulation; And the light measurement unit, be located in pluggable mode on the position of focus of emergent light on the light path between described projection lens and the described screen, that depart from described projection lens, each coloured light of RGB that penetrates from described projection lens is measured.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid back projection device, wherein said a plurality of colored filter is along disposing with the circumferencial direction of the color paper tinsel of fixed speed rotation, described color paper tinsel has sign, described sign as described modulating unit to each coloured light of RGB carry out modulation treatment during benchmark, the result that can measure each coloured light of described RGB according to described light measurement unit sets the position of described sign.
Aforesaid back projection device, wherein said light measurement unit has to indicate respectively to be measured beginning and measures the function that finishes, can corresponding to described modulating unit to each coloured light of RGB carry out modulation treatment during, indicate described light measurement unit begin to measure and finish measure.
Aforesaid back projection device, wherein said light-modulating cell is made of Digital Micromirror Device.
The present invention compared with prior art has tangible advantage and beneficial effect.As known from the above, for achieving the above object, foundation the 1st invention of the present invention is characterised in that and comprises: light source; A plurality of colored filters make the light transmission that sends from described light source, and penetrate each coloured light of RGB successively; Light modulation (opticalmodulation) unit utilizes picture signal to come each coloured light of RGB that sees through described colored filter is modulated; Projection lens will project on the screen through the light after the described light-modulating cell modulation; With the light measurement unit, be located in pluggable mode on the position of focus of emergent light on the light path between described projection lens and the described screen, that depart from described projection lens, each coloured light of RGB that penetrates from described projection lens is measured.
According to the 1st invention, the 2nd invention is characterised in that: described a plurality of colored filters are along disposing with the circumferencial direction of the color paper tinsel (color foil) of fixed speed rotation, described color paper tinsel has a kind of sign, this the sign as described modulating unit to each coloured light of RGB carry out modulation treatment during benchmark, the result that can measure each coloured light of described RGB according to described light measurement unit sets the position of described sign.
According to the 2nd invention, the 3rd invention is characterised in that: described light measurement unit has can be pointed out to measure beginning respectively and measure the function that finishes, can corresponding to described modulating unit to each coloured light of RGB carry out modulation treatment during, indicate described light measurement unit begin to measure and finish measure.
According to each invention in the 1st to the 3rd invention, the 4th invention is characterised in that: described light-modulating cell is made of DMD.
By technique scheme, back projection device of the present invention has following advantage and beneficial effect at least: according to the present invention, can provide a kind of and can carry out the back projection device that picture is regulated accurately.
In sum, the present invention the invention provides a kind of back projection device that can carry out the picture adjusting accurately.In this back projection device, optical sensor is configured in pluggable mode on the position of focus of emergent light on the light path between projection lens and the screen, that depart from projection lens, utilizes this optical sensor to come R, the G, the pairing brightness of each coloured light of B that see through the transmission-type colored filter are measured.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on product structure or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing back projection device has the outstanding effect of enhancement, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the summary construction diagram by the many picture display devices of DLP that back projection device constituted of the present invention's first example.
Fig. 2 is the summary construction diagram of the back projection device of first example.
Fig. 3 is the detailed maps of apparatus main body of the back projection device of first example.
Fig. 4 is the schematic diagram during the signal processing of the color paper tinsel that uses in first example and DMD.
Fig. 5 is the summary construction diagram of the optical sensor that uses in first example.
Fig. 6 is the schematic diagram of the light measurement state of the optical sensor that uses in first example.
Fig. 7 is the schematic diagram of the relation of the output of employed optical sensor in the explanation of the present invention's second example and value of statistical indicant.
100～400: back projection device 1: apparatus main body
2: projection lens 3: speculum
4: screen 11: light source
11a: lamp: 11b: speculum
12: color paper tinsel 12a, 12b, 12c: transmission-type colored filter
12e: sign 12d: rotating shaft
13: lens combination 14: prism
15:DMD 16:DMD control part
17: optical sensor 18: micro motor
18a: rotating shaft 19: arm
21: upgrade reference signal i, i1～i5: pixel
G: gap
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to (title) its embodiment, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
First example:
Fig. 1 represents the digital light that back projection device constituted processing (Digital Light Processing, DLP) schematic configuration of many picture display devices in the present invention's first example.In the case, the many picture display devices of DLP are many picture display devices that combination a plurality of (being 4) back projection device 100～400 has 2 * 2 big picture in the legend.
Fig. 2 represents the schematic configuration of back projection device.What represent among Fig. 2 is back projection device 100.In the drawings, 1 indication device main body, this apparatus main body 1 makes each the transmission-type colored filter that sees through RGB (red, green, blue) from the light of light source ejaculation successively, thereby produce each coloured light of RGB (red, green, blue), and, utilize DMD and be that unit comes these light is reflected, these light are penetrated from projection lens 2 with the pixel.Narrate the details of apparatus main body 1 hereinafter.
In the emitting light path of projection lens 2, dispose speculum 3, in the reflected light path of this speculum 3, disposing screen 4.3 pairs of speculums reflect from each coloured light that projection lens 2 penetrates, by each coloured light on 4, is demonstrated coloured image from the rear projection to the screen.
Fig. 3 is the figure of structure that the apparatus main body 1 of back projection device 100 is described in more detail.And, among Fig. 3, the part mark identical with Fig. 2 same-sign.
Among Fig. 3,11 expression light sources, this light source 11 comprise the lamp 11a and the speculum 11b of extra-high-pressure mercury vapour lamp (extra-highpressure mercury lamp) for example etc., and the illumination that this speculum 11b is used for sending from described lamp 11a is mapped on the predetermined direction.
The light path of the light that sends from light source 11, disposing discoideus color paper tinsel 12.Shown in Fig. 4 (a), in this color paper tinsel 12, equally spaced disposing a plurality of (being this three look of R (red) G (green) B (indigo plant) in the legend) transmission-type colored filter 12a, 12b, 12c along circumferencial direction.And, establishing rotating shaft 12d at the central part of color paper tinsel 12, drive color paper tinsel 12 with fixing speed rotation by not shown CD-ROM drive motor via rotating shaft 12d.That is to say that color paper tinsel 12 makes the light that penetrates from light source 11 see through transmission-type colored filter 12a, 12b, 12c successively by rotation.
In the light path of the light that sees through transmission-type colored filter 12a, 12b, 12c, disposing DMD15 through lens combination 13, prism 14 as light-modulating cell.Lens combination 13 and prism 14 will be directed among the DMD15 through R, G, each coloured light of B of transmission-type colored filter 12a, 12b, 12c.DMD15 comes each coloured light of RGB that sees through transmission-type colored filter 12a, 12b, 12c is modulated according to picture signal.At this moment, among the DMD15, on Silicon Wafer, disposing fine micro-reflector two-dimensionally, each micro-reflector is corresponding to the pixel that constitutes 1 image, and do deflection action with the high speed about 10 μ s, incident light is reflexed on the both direction (on/off), and utilize the reverberation of on direction wherein to come represent images.
Disposing projection lens 2 in the catoptrical light path on the on of DMD15 direction.This projection lens 2 is used for amplifying the reverberation on the on direction of DMD15.Then, the light that penetrates after amplifying through projection lens 2 is reflected,, thereby make color display on the screen 4 back side of this optical projection to screen 4 by speculum 3.
Near the position of the focus of emergent light in the light path between projection lens 2 and screen 4, that depart from projection lens 2 (in the legend for projection lens 2), disposing photodiode optical sensors 17 such as (Photodiode) in pluggable mode, as the light measurement unit.This optical sensor 17 is used for measuring R, G, the pairing color of each coloured light of B and the brightness through transmission-type colored filter 12a, 12b, 12c.And, as shown in Figure 5, optical sensor 17 is located at the front end of the arm 19 that links to each other with rotating shaft 18a as the micro motor 18 of drive source, be usually located at illustrated dotted line position, when the light that penetrates from projection lens 2 is detected, drive rotating shaft 18a rotation by micro motor 18, described optical sensor 17 is moved to till the illustrated solid line position, and be positioned at the front of projection lens 2.At this moment, be positioned at optical sensor 17 under the state in front of projection lens 2, fix arm 19, make optical sensor 17 can not move by not shown fixed mechanism.
Herein, optical sensor 17 is configured in the position of the focus of the emergent light that departs from projection lens 2, its reason is: on the position that coincide with the focus of the emergent light of projection lens 2, for example shown in Figure 6, can demonstrate the pairing pixel i of each micro-reflector of DMD15 with different brightness brightly, and the gap g between these pixels i, therefore, described transducer is positioned at situation on the pixel i1 shown in (a) among Fig. 6 under, and shown in (b) among Fig. 6, be positioned at a plurality of pixel i2, i3, i4, under the situation on the i5, can be because of having or not gap g to produce brightness disproportionation between pixel, thus cause the measurement result of optical sensor 17 to produce difference.On the contrary, if optical sensor 17 is configured on the position of focus of the emergent light that departs from projection lens 2, so just can not demonstrate the gap between the different pixel of brightness and these pixels as shown in Figure 6, therefore, the measurement result of optical sensor device 17 is not easy to be subjected to the influence of the gap portion between pixel, thereby can obtain the less stable measurement result of difference.
Above content is the explanation of being done for back projection device 100, but other back projection devices 200～400 are also identical therewith.
The effect of the example that constitutes in this way then, is described.
At first, under the common user mode of show image on the screen 4, optical sensor 17 is set in dotted line position shown in Figure 5.Under this state, make the light that penetrates from light source 11 see through each transmission-type colored filter 12a with the color paper tinsel 12 of fixed speed rotation, 12b, 12c successively after, be injected among the DMD15 through lens combination 13, prism 14.And, if the never illustrated main device of picture signal is input in the DMD control part 16, this DMD control part 16 can be controlled according to this picture signal so, utilize each micro-reflector of DMD15, will reflex on the on direction through R, G, each coloured light of B of transmission-type colored filter 12a, 12b, 12c.Then, the reverberation on the on direction of this DMD15 penetrates from projection lens 2 through amplification, after mirror 3 reflections that are reflected, and color display on screen 4.
Then, when R, the G, the pairing brightness of each light of B or the color that see through transmission-type colored filter 12a, 12b, 12c are regulated, make arm 19 rotations by driving micro motor 18, as shown in Figure 5, make optical sensor 17 be positioned at the front of the exiting side of projection lens 2.Under this state, make the light that sends from light source 11 see through each transmission-type colored filter 12a, 12b, 12c successively with the color paper tinsel 12 of fixed speed rotation, R, G, each coloured light of B are injected among the DMD15.And, the never illustrated main device of reference signal is input in the DMD control part 16 as picture signal.This reference signal and R, G, each coloured light of B are corresponding, are used to make homochromy reference pattern to be presented at screen 4.DMD control part 16 is controlled according to reference signal, utilize each micro-reflector of DMD15, to reflex on the on direction through R, G, each coloured light of B of transmission-type colored filter 12a, 12b, 12c, and this reverberation is penetrated from projection lens 2, thereby make demonstration and R, G on the screen 4, the corresponding homochromy reference pattern of B light.
Under this state, optical sensor 17 is according to the reverberation that penetrates from projection lens 2, respectively to measuring through transmission-type colored filter 12a, R, the G of 12b, 12c, the color and the brightness of each coloured light of B.The measured signal of optical sensor 17 is sent in the not shown main device.In main device, according to versicolor measured signal from each optical sensor 17 of back projection device 100～400, judge R, the G between the back projection device 100～400, the brightness of each coloured light of B and the deviation of color, produce correction signal according to this result of determination, and this correction signal is input in the DMD control part 16 of each back projection device 100～400.Like this, in each back projection device 100～400, utilize DMD control part 16 to proofread and correct reverberation on the on direction of micro-reflector of DMD15, each picture to all back projection devices 100～400 is regulated, feasible R, G, the pairing brightness of each coloured light of B and the solid colour that sees through transmission-type colored filter 12a, 12b, 12c.
Therefore, according to above mode, with optical sensor 17 in pluggable mode, be configured on the position of focus of emergent light on the light path between projection lens 2 and the screen 4, that depart from projection lens 2, utilize this optical sensor 17 to measure R, G, the pairing color of each coloured light of B and brightness through transmission-type colored filter 12a, 12b, 12c.So, the influence of brightness disproportionation in the time of on the position that optical sensor 17 is not configured in and the focus of the emergent light of projection lens 2 is coincide, that be presented at part between pixel on the focusing position and these pixels etc., the high-precision measured value of measurement result indifference can be obtained, thereby brightness and color can be regulated more accurately.And, optical sensor 17 can be according to the reverberation on the on direction of DMD15, come directly the light that penetrates and project on the screen 4 from projection lens 2 to be measured, therefore, can obtain not contain the high-precision measured signal of clutter, by using this kind measured signal, can regulate brightness and color more accurately.
Variation:
In described example, the light that projects from projection lens 2 directly is injected into the optical sensor 17, but also can be at the front of projection lens 2 sides of optical sensor 17 configuration diaphragm (diaphragm).Like this, can utilize diaphragm to regulate the light intensity that is injected into optical sensor 17 from projection lens 2, therefore, can prevent that the light that for example projects from projection lens 2 from crossing strong and cause the measured signal of optical sensor 17 to reach capacity.
Second example:
As shown in Figure 4, on color paper tinsel 12, setting sign (marking) 12e that represents rotary position information.And, shown in (b) among Fig. 4, indicate that with this 12e is a benchmark, produce renewal (refresh) reference signal 21 corresponding with DMD15, according to the sign set point S between this renewal reference signal 21 and the sign 12e, shown in (c) among Fig. 4, will be directed to through R, G, each coloured light of B of transmission-type colored filter 12a, 12b, 12c among the DMD15 during, set with DMD15 to R, G, each coloured light of B carry out modulation treatment during consistent.
Yet, the sign 12e of color paper tinsel 12 is sometimes because of following former thereby generation offset, this reason for example refers to be used to read the offset that this indicates the not shown transducer of 12e, the skew of the installation site when perhaps changing color paper tinsel 12 or described transducer after product turnout etc.So, for example, shown in (d) among Fig. 4, if the position of sign 12e produces skew, then indicate that with this position of 12e is that benchmark produces and upgrades reference signal 21, and set DMD15 to R, G, each coloured light of B carry out modulation treatment during, therefore, see through transmission-type colored filter 12a, R, the G of 12b, 12c, each coloured light of B be directed among the DMD15 during, with DMD15 to R, G, each coloured light of B carry out modulation treatment during produce deviation.The result, shown in Fig. 4 (d), DMD15 R, G, each coloured light of B are carried out modulation treatment during in, during some (the A part among the figure) be light to different colours carry out modulation treatment during, this can cause projecting the colorimetric purity variation of the image on the screen 4, and, also can cause the brightness and the color of R, G, each light of B between the picture of back projection device 100～400 inconsistent.
Therefore, in this second example, as shown in Figure 5, be positioned at optical sensor 17 under the state in front of projection lens 2, with above explanation similarly, the never illustrated main device of reference signal is input in the DMD control part 16, DMD control part 16 is controlled according to this reference signal, utilize each micro-reflector of DMD15 that described reverberation is reflexed on the on direction, this reverberation is penetrated from projection lens 2, thereby, make on the screen 4 corresponding to R, G, each coloured light of B and show homochromy reference pattern.Then, utilize optical sensor 17 to measure from R, the G of projection lens 2 ejaculations, the brightness of each coloured light of B.At this moment, for example, with regard to red (R), if one side changes the position (value of statistical indicant (index value)) of sign 12e, one side is recycled optical sensor 17 and is measured, and so, can obtain the variation of the measured value (output) shown in (a) among Fig. 7.Reason is: if sign 12e is near suitable position, so, see through transmission-type colored filter 12a, R, the G of 12b, 12c, each coloured light of B be directed among the DMD15 during, with DMD15 to R, G, each coloured light of B carry out modulation treatment during can be approaching consistent; On the contrary, if sign 12e is away from suitable position, so, see through transmission-type colored filter 12a, R, the G of 12b, 12c, each coloured light of B be directed among the DMD15 during, with DMD15 to R, G, each coloured light of B carry out modulation treatment during deviation can become big.Green (G), blue (B) if one side changes the position (value of statistical indicant) of sign 12e, simultaneously recycle optical sensor 17 and measure too, can obtain as (b) among Fig. 7 so and the variation of the measured value (output) (c).
And, according to these measurement results, following value of statistical indicant being made as the position that characteristic value (proper value) B decides sign 12e, wherein said value of statistical indicant is meant optical sensor 17 couples of R, G, the B greatest measured value of measuring gained of all kinds.
Therefore, according to above mode, can set the appropriate location of the sign 12e of color paper tinsel 12 according to the measured value of optical sensor 17 exactly, indicate that with this position of 12e is a benchmark, set DMD15 to R, G, each coloured light of B carry out modulation treatment during, whereby, see through transmission-type colored filter 12a, 12b, the R of 12c, G, each coloured light of B be directed among the DMD15 during, with DMD15 to R, G, each coloured light of B carry out modulation treatment during be consistent for a long time, therefore, the colorimetric purity of image can be improved, and the R between the back projection device 100～400 can be avoided, G, the brightness and the color of each coloured light of B are inconsistent.
The 3rd example:
On the other hand, measure through R, the G of transmission- type filter 12a, 12b, 12c, the color and the brightness of each coloured light of B when utilizing optical sensor 17, and come the brightness and the color of R, G, each coloured light of B are carried out timing according to this measurement result, can't judge exactly whether the measured value that is recorded by optical sensor 17 is corresponding with the light that sees through each transmission- type filter 12a, 12b, 12c.
Therefore, in this 3rd example, making in second example sign 12e with color paper tinsel 12 is with to measure the sequential (timing) of R, G, each coloured light of B synchronous on the optical sensor 17 during R, G, the pairing modulation treatment of each coloured light of B of that benchmark is set, the DMD15 shown in Fig. 4 (c).In the case, use following optical sensor 17, this optical sensor 17 has can be pointed out respectively to begin R, G, each coloured light of B are measured and finished function to the mensuration of R, G, each coloured light of B.
Like this, for example, if corresponding to DMD15 to red (R) light carry out modulation treatment during, come respectively that the mensuration of pilot light transducer 17 begins and finishes, so just red (R) light is measured; If corresponding to green (G) light is carried out modulation treatment during, come the mensuration of pilot light transducer 17 to begin and finish, so just green (G) light is measured; If corresponding to blue (B) light is carried out modulation treatment during, come the mensuration of pilot light transducer 17 to begin and finishes, so just indigo plant (B) light is measured.
Therefore, according to above mode, can make sequential that optical sensor 17 couples of R, G, each coloured light of B measures, with see through transmission-type colored filter 12a, R, the G of 12b, 12c, B phototiming of all kinds, therefore, the pairing measured value of each determination object be can obtain exactly, thereby can the color and the brightness of picture be proofreaied and correct exactly by using this measured value.
In addition, the present invention is not limited to described example, the implementation phase in, can in the scope that does not change aim of the present invention, carry out various deformation.For example, in described example, what optical sensor 17 was measured is the color and the brightness of R, G, each coloured light of B, but also can only measure brightness.
And, in described example, comprise the invention in various stages, by suitably a plurality of constitutive requirements that disclosed being made up, can realize multiple invention.For example, after the some constitutive requirements of deletion from all constitutive requirements shown in the example, still can solve the problem described in " inventing problem to be solved ", and can obtain effect described in " invention effect " time, the formation of having deleted these constitutive requirements also can be as invention.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (4)
1. back projection device is characterized in that comprising:
Light source;
A plurality of colored filters make the light transmission that sends from described light source, and penetrate each coloured light of RGB successively;
Light-modulating cell utilizes picture signal to come each coloured light of RGB that sees through described colored filter is modulated;
Projection lens will project on the screen through the light after the described light-modulating cell modulation; And
The light measurement unit is located in pluggable mode on the position of focus of emergent light on the light path between described projection lens and the described screen, that depart from described projection lens, and each coloured light of RGB that penetrates from described projection lens is measured.
2. back projection device according to claim 1 is characterized in that:
Described a plurality of colored filter is along can disposing with the circumferencial direction of the color paper tinsel of fixed speed rotation,
Described color paper tinsel has sign, described sign as described modulating unit to each coloured light of RGB carry out modulation treatment during benchmark, the result that can measure each coloured light of described RGB according to described light measurement unit sets the position of described sign.
3. back projection device according to claim 2 is characterized in that:
Described light measurement unit has to indicate respectively to be measured beginning and measures the function that finishes, can corresponding to described modulating unit to each coloured light of RGB carry out modulation treatment during, indicate described light measurement unit begin to measure and finish measure.
4. according to the described back projection device of arbitrary claim in the claim 1 to 3, it is characterized in that:
Described light-modulating cell is made of Digital Micromirror Device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007159107A JP2008310156A (en) | 2007-06-15 | 2007-06-15 | Rear projector device |
| JP2007159107 | 2007-06-15 |
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| Publication Number | Publication Date |
|---|---|
| CN101325722A true CN101325722A (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101106991A Pending CN101325722A (en) | 2007-06-15 | 2008-06-13 | Back projection device |
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| JP (1) | JP2008310156A (en) |
| CN (1) | CN101325722A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111432202A (en) * | 2019-01-09 | 2020-07-17 | 中国科学院长春光学精密机械与物理研究所 | Image sensor transfer function testing device and testing method |
| CN114339182A (en) * | 2021-12-30 | 2022-04-12 | 上海顺久电子科技有限公司 | Focusing method of projection equipment, projection equipment and storage medium |
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2007
- 2007-06-15 JP JP2007159107A patent/JP2008310156A/en active Pending
-
2008
- 2008-06-13 CN CNA2008101106991A patent/CN101325722A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111432202A (en) * | 2019-01-09 | 2020-07-17 | 中国科学院长春光学精密机械与物理研究所 | Image sensor transfer function testing device and testing method |
| CN114339182A (en) * | 2021-12-30 | 2022-04-12 | 上海顺久电子科技有限公司 | Focusing method of projection equipment, projection equipment and storage medium |
| CN114339182B (en) * | 2021-12-30 | 2024-03-26 | 上海顺久电子科技有限公司 | Focusing method of projection device, projection device and storage medium |
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| JP2008310156A (en) | 2008-12-25 |
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