DE102006053639A1 - Image projecting method, involves determining actual deviations of projection of two beams on projection surface and temporally varying intensity of beams after deviations for production of actual-impression - Google Patents

Abstract

The method involves producing a reference-impression of an image by overlapping of the projection of two beams (110, 210) on a projection surface (10). An actual-impression of the image that is different from the reference-impression is produced on the projection surface by actual deviations of the projection of the beams. The actual deviations of the projection of the beams on the projection surface are determined. The intensity of the beams is temporally varied after the deviations for the production of the actual-impression.

Description

The The invention relates to a projection apparatus and a method for projection with improved projection property.

In devices For the projection of images, several beams are superimposed for each pixel and on a projection screen projected. Ideally, this creates a projection on the screen single spot composed of the colors of the rays. In a so-called "flying spot process" the rays become in front of the projection surface over a guided by a movable mirror, with which you move through suitable a picture on the projection screen can generate. Production-related, minimum angular deviations of the superimposed beams to lead on the projection screen to a unequal coverage of the individual spots, the color disturbances of the Caused projection image. Due to thermal stress can be the deviation of the individual spots also during the Change operation.

task The invention is a method of projecting an image to provide, which is characterized by an improved projection property and thus reduces the above-mentioned disadvantages. This task is achieved by a method for the projection of an image according to claim 1 solved. Particularly advantageous embodiments and further radiation-emitting Devices are the subject of further claims.

at the method according to a embodiment The invention will be an image by projection at least generates a first and second beam onto a projection surface, being due to the overlay the projection of the first and second beam onto the projection surface a desired impression the image should be generated. An actual deviation of the projection of the at least first and second beams is generated on the projection surface However, a deviating from the target impression actual impression. The Method according to the embodiment the invention has the method steps A) determination of the actual Deviation of the projection of the first of the second beam the projection surface, and B) temporal intensity variation of the first and / or second beam after in process step A) determined deviations to produce the desired impression. These embodiment has the advantage of improving the picture quality of the projector becomes. In addition, you can The production costs are lowered, compared to previously existing systems, the manufacturing tolerances kept lower can be. In addition, the self-calibration of the position of the Projection on the projection screen the Long-term stability of the projector significantly increased. The method of projection an illustration according to the embodiment leads to a more precise overlay the rays and thus to an improved color and image quality.

One Another advantageous feature of another embodiment The method is a first mirror, the at least the first and directs the second beam to project the pixels onto the projection surface. Advantageously, this first mirror is movable. This has to the advantage that by suitable movement of the first mirror a Image is generated on the projection plane.

advantageously, This first mirror is controlled electronically. The advantage It is that by the electronic control, the movement of the Mirror can optionally be modulated.

Farther The method may have the advantageous feature that as the first and second beam laser beams are used. The wavelength range the laser beam advantageously comprises a red, green or blue spectral range. The use of laser beams is advantageous, because with them a very precise picture with defined Color mixtures can be produced. The choice of spectral ranges Red Green and blue has the advantage of displaying the entire color spectrum can.

Farther For example, the at least first and second beams may each comprise a first and a second beam have second intensity, by at least first and second electronic signal is produced. The advantage with this is that by a suitable mixture the intensities a variety of colors can be produced. The weaker the intensity a color is the stronger the color of the other rays comes out. This allows everyone Projection point can be customized on the projection screen.

advantageously, The method of projecting an image has various embodiments which differ in whether the method steps A) and B) before or during of the projection operation become. Furthermore there is for both variants the possibility perform the method step A) by the first mirror has a variable orientation or by the first mirror has a fixed orientation.

In an advantageous embodiment of the invention, a second mirror is positioned between the first mirror and the projection surface for performing method step A). In each case only a single beam is in operation. This second mirror has the advantage that it is the beam that is currently in operation, of the projection surface can lead away. This derivation from the projection surface can be performed with each of the beams. Advantageously, a semi-transparent mirror or a deflection mirror is used as the second mirror. A semi-transparent mirror has the advantage that it only partially deflects the beam that is currently in operation away from the projection surface, but allows another part of the beam to continue to project onto the projection surface. However, it is also possible to use a non-transparent second mirror, since in this embodiment of the invention the method step A) is carried out before the actual projection operation. In other words, at least partial projection of the beam onto the projection surface during method step A) is not necessary in this embodiment of the invention.

In an advantageous embodiment of the method is the second mirror positioned so that it has the particular beam that is currently in operation is, at least partially on a detector with a fixed position directs. This has the advantage that the position of the projection of the Beam that is currently in operation can be measured on the detector can. However, part of the beam can still be observed on the projection surface become. Advantageously, the jet that is currently operating is a projection on the detector to which it is directed.

conveniently, is the respective beam, which is in operation by means of a before Focusing the lens present to the detector. This has the advantage that the width of the beam given for technical reasons is, can be focused on a small point. The advantage in this case, that is the detection of the position of the projection of the beam performed more accurately can be.

In a further advantageous embodiment of the invention the first mirror for brought the first beam in a first orientation, at the Detector a maximum intensity of the first beam is measured. Advantageously, the first Mirror also for brought the second beam in a second orientation, in the measured at the detector a maximum intensity of the second beam becomes. The advantage of this is that you have a defined one for each ray Orientation of the first mirror receives, which coincides with the position of Projection of the beam on the detector to be associated can. To get even more accurate results, it is still advantageous for the first mirror for the first beam to a third orientation of the first mirror measure at which the first beam on a second detector maximum intensity having. Likewise, for the second beam a fourth orientation of the first mirror be measured, in which the second beam on a second detector a maximum intensity having. This has the advantage of being both for the first and for the second Beam further orientations of the mirror receives the with the position of the projection the rays on a second detector to be associated can.

To determining the mirror orientations for each beam, it is advantageous the deviation of the beams from each other by means of the difference of Determine mirror orientations. It is convenient, with a suitable method to measure the mirror orientations.

advantageously, become the first and second and / or the third and fourth orientation the first mirror contactless over the Capacity between the mirror and a counterpart measured. From the difference between the first and second and / or the third and fourth orientation of the first mirror may be the actual Deviation of the first and second beam can be determined. The Determination of two differences, the first and second orientation and the third and fourth orientation, has the advantage that one gets more accurate results. From the two differences an average value can be formed. The measurement of the orientations over the capacity has the advantage that due to the non-contact measuring method no disorders can be caused at the orientation of the mirror.

Farther may be the first and second and / or the third and fourth orientation of the first mirror can be measured with a mechanical probe. From the Difference between the first and second and / or the third and fourth orientation of the first mirror may be the actual Deviation between the first and second beam can be determined. The mechanical sensor has the advantage that it provides very accurate measurement results for orientation of the mirror supplies.

Farther may be the first and second and / or the third and fourth orientation each of the first mirror may be determined by the first mirror with an additional Beam is irradiated, and its deflection by means of a second Detector is determined. The orientation of the first Mirror determined by the deflection of the additional beam. Advantageously, the additional Beam at an inclined angle to the at least first and arranged second beam. This measuring method for orientation of the Mirror has the advantage that it is trouble-free for the rest of the projection mode runs.

In a further embodiment of the invention, the first and second and / or third and fourth orientations of the first mirror are used determines an angular deviation between the first and second beam. The determined angle deviation serves to determine the actual deviation between the first and second beam on the projection surface. This has the advantage that the angle deviation can be calculated by measuring the orientations of the mirror for the respective beam and thus the deviation of the beams from one another on the projection surface can be determined without directly measuring them.

One Another advantageous feature of another embodiment the invention is the projection of an image, wherein during the Process step A) the first mirror for each beam in at least a fixed orientation is maintained. advantageously, becomes a detector for the first beam in a first position and for the second beam in a second position brought at the detector in each case a maximum intensity the respective beam is measured. This has the advantage that the first mirror does not have to be extra moved to certain Defining positions of the rays.

To determining the detector positions for each beam, it is advantageous the deviation of the beams from each other by means of the difference of Determine detector positions. It is cheap, with a suitable Procedure to measure the detector positions.

It is also advantageous, the first and second position of the detector contactless about the capacity between the detector and a counterpart to eat. From the difference between the first and second position of the detector can be the actual Deviation between the first and second beam can be determined.

Farther it is advantageous to the first and second position of the detector with a mechanical probe to measure, and from the difference between the first and second Position of the detector the actual Deviation of the first and second beam to determine. The non-contact Measuring method of the position of the detector by means of the measurement of the capacity has to Advantage that a measurement is performed that does not disturb the Position of the detector causes. The measurement of the position of the Detector with a mechanical probe has the advantage that very accurate results about the position of the detector can be obtained.

In a further embodiment it is advantageous to determine the position of the projection of the rays on the detector a large number of detectors, a so-called detector array use. Advantageously, this is an im essential two-dimensional matrix of detectors, for example a CCD (Charge Coupled Device) array. It is advantageous when the plurality of detectors is positioned so that all Positions of the projections of the beams on the plurality of detectors can be measured. This has the advantage that a movement of the detector for detection all projections of the rays on the detector is no longer necessary.

advantageously, is the respective beam, which is in operation by means of a before Focusing on the variety of detectors existing lens. That has to Advantage that the width of the beam, which arises for technical reasons, is minimized, and so the detection of the position of the projection the beam becomes more accurate.

conveniently, becomes from the positions of the projection of the rays on the multitude of detectors an angular deviation between the first and second Beam determined. The calculated angle deviation is used the actual Determine deviation of the first and second beam on the projection surface. This has the advantage that the position of the projections of the rays on the projection screen can be determined without measuring them directly on the projection screen. The measurement is done via the Measurement of the position of the projection of the rays on the detector.

In a further embodiment The invention is an advantageous feature that a third steel is present, whose deviation from the first and / or second beam according to the method described above and the various embodiments is determined. The use of a third jet has the advantage that the spectrum of colors represented by the rays can be is greatly expanded. Three rays are used and include these the three primary colors red, blue and green, can advantageously a full color projection of the picture be achieved.

In a further advantageous embodiment of the invention, the advantageous feature is present that a second semi-transparent mirror is positioned between the first mirror and the projection surface for performing method step A). In this case, advantageously, all the beams are simultaneously in operation, wherein they produce the actual impression on the projection surface. It is advantageous if the beams are partially directed by the second mirror to a detector. The advantage of this is that the beams can simultaneously generate an image on the projection surface and can be directed to a detector. Thus, detection of the rays is possible while at the same time the projection of an image on the projection surface takes place. In other words Thus, the method step A) can be carried out while the projection device is in operation.

Farther it is advantageous if to separate the rays between the second mirror and the detector, a filter is present. The filter has the advantage that it is each permeable to a beam to the detector is. The remaining Rays can thus Do not disturb the detection of the one beam.

Farther It is advantageous if, for the separation of the beams, a diffractive Element is present after the second mirror. The advantage with A diffractive element is that it breaks the rays and steer in different directions. For this it is advantageous if as a detector a plurality of detectors, for example a Detector array, is used. The respective beam, on the variety is directed by detectors, generates a projection on the multiplicity of detectors. The advantage of this is that a variety of detectors all rays that have been separated by a diffractive element, can detect.

Farther it is advantageous if the plurality of detectors a fixed Position has. conveniently, while the mirror is brought into a first orientation, in the the plurality of detectors measure an intensity maximum of the first beam. Furthermore, it is advantageous if the first mirror in a second Orientation is brought in the variety of detectors intensity maximum of the second beam. The advantage of this is that an orientation of the first mirror can be associated with the intensity of the beam on the variety of detectors.

It is also advantageous if the first mirror in a third Orientation is brought in the variety of detectors intensity maximum of the first beam. Furthermore, it is favorable if the first mirror is brought into a fourth orientation in which the plurality of Detectors an intensity maximum of the second beam. A measurement of a third and fourth Orientation of the first mirror is advantageous because thus the accuracy the measurement of the mirror orientation is increased.

To determining the mirror orientations for each beam, it is advantageous the deviation of the beams from each other by means of the difference of Determine mirror orientations. It is convenient, with a suitable method to measure the mirror orientations.

Farther it is advantageous if the first and second and / or the third and fourth orientation of the first mirror respectively contactlessly across the capacitance between the mirror and a counterpart is measured. From the difference between the first and second and / or the third and fourth orientations of the first mirror can do the actual Deviation of the first and second beam can be determined. Of the Advantage is that over the orientations of the mirror the deviation of the beams from each other on the projection screen can be determined without directly measuring them there. The non-contact measurement method over the capacity has the advantage that no disturbance the orientation of the mirror can take place.

Farther it is advantageous if the first and second and / or the third and fourth orientation of the first mirror each measured with a mechanical probe becomes. It can be the difference between the first and second and / or the third and fourth orientations of the first mirror the actual Deviation of the first and second beam can be determined. Of the The advantage here is that a measurement of the orientation of the first Mirror with the mechanical probe very accurate results over the orientation of the mirror provides.

It is also advantageous if the first and second and / or the third and fourth orientation of the first mirror respectively thereby it is determined that the first mirror with an additional Beam is irradiated. The deflection of the additional beam through the first mirror is determined by means of a second detector. The orientation of the first mirror can thereby by the deflection of the additional Beam can be determined. This is a particularly advantageous method of measurement the orientation of the first mirror because of the operation of the projector not disturbed becomes. It is advantageous if the additional beam under a inclined angle to the at least first and second beam is. This has the advantage that there is no interference between the Can give rays.

A further advantageous embodiment is the determination of the first and second and / or the third and fourth orientation of the first mirror from which an angular deviation between the first and second beam is determined. The investigation the actual Deviation of the first and second beam on the screen can are obtained with the determined angular deviation. That has to Advantage that the actual Deviation of the beams from each other on the screen over the Determining the mirror orientations can take place.

A further advantageous feature of a further embodiment is a method step A), wherein the first mirror has at least one defined orientation for each beam. That has to Advantage that the mirror does not have to be moved additionally.

there It is advantageous if a detector for the first beam in a first position and for the second beam is brought to a second position. there In each case a maximum intensity of the respective beam is measured at the detector.

Farther it is advantageous if the first and second positions of the detector contactless over the capacity measured between the detector and a counterpart. From the difference between the first and second position of the detector can thereby the actual Deviation between the first and second beam can be determined. This has the advantage that over the non-contact Measuring method of the position of the detector does not disturb the position can. Furthermore, the position of the detector with the orientation the mirror and thus the position of the rays associated.

Farther it is advantageous if the first and second positions of the detector with a mechanical probe is measured. From the difference between the first and second Position of the detector can be the actual deviation of the first and second beam. The measuring method with a mechanical probe has the advantage of giving you very accurate measurement results of the position of the detector supplies.

It is further advantageous when determining the position of the Projection of the rays on the detector a variety of detectors is used. It is particularly advantageous if the plurality of detectors is positioned so that all projections of the Rays on the variety of detectors can be measured. The has the advantage that the large number of detectors not for each beam each have to be moved to a new position. Furthermore, it is advantageous when the respective beam by means of one of the plurality of detectors focused on existing lens. This has the advantage that the Beam width, which arises for technical reasons, is minimized and thus the measurement accuracy of the position of the beam on the detector elevated becomes.

A further advantageous embodiment, that from the positions of the projection of the rays on the multitude of detectors an angular deviation between the first and second Beam is determined. Determining the actual deviation of the first and second beam on the screen can be through the use of the angular deviation between the first and second beam determined become. The advantage with this is that an indirect measurement of the position the rays take place on the projection surface, the Position of the projection of the rays on the detectors is measured.

In A further advantageous embodiment is a third Ray exists whose deviation from the first and / or second Beam according to the method according to the above described embodiments is determined. This has the advantage that the use of three Radiation provides a wider color spectrum and thus a color more diverse picture can be generated.

In A further advantageous embodiment of the in Process step A) determined angular deviations a phase shift the at least first electronic signal relative to the second determined electronic signal.

The has the advantage that the orientation of the mirror respectively the position of the detectors provides values for angular deviations, with which the control of the rays are related can.

Farther it is advantageous if in step B) the desired impression by temporal intensity variation of the first and / or second electronic signal by means of the determined Phase shift is restored from the actual impression. The advantage here is that restoring the desired impression on the projection screen not by a mechanical change of the projector, but by calculating a phase shift and the possible ones temporal intensity variation the electronic signals necessary for the control of the beams are responsible. The temporal intensity variation advantageously comprises a time delay at least one electronic signal for driving a beam. This can conveniently the desired impression of the image generated on the projection screen if, for example, the pixels line by line through the at least first and second beam are generated (flying spot method).

In a further advantageous embodiment of another embodiment can be generated line by line on the screen (line rasterization) be disregarded. The inventive method is also for any Trajectories of the rays on the projection screen applicable. So can the Trajectory along a line deviating from a straight line. In one embodiment describes the trajectory Lissajous-like figures on the projection screen.

In a further advantageous embodiment of a further embodiment, a projection device has a first and second radiation source for generating a first and second Beam on, as well as a projection device for the projection of the first and second beam onto a projection surface. It is advantageous if an image is projected onto the projection surface. The projection apparatus may further comprise an electronic controller for the first and second radiation source, and a detection device for detecting a deviation between the projection of the first and second beam on the projection surface. In this case, it is advantageous if the projection device is set up such that, as a function of the deviation between the projection of the first and second beam on the projection surface detected by the detection device, the electronic control for the first and / or second radiation source is delayed in time can be that the deviation is reduced or corrected. That is, each pixel on the projection surface represented by the rays can be more clearly represented by the time delay of the rays, because the time delay of the local deviation of the rays from each other due to the inertia of the perceptual perception of an outside observer counteracts. This has the advantage that the projection device does not have to be changed mechanically in order to improve the image quality on the projection surface. Only a metrological measure is necessary in order to use the values and calculations obtained therefrom to change the electronic control of the beams in such a way that the image quality is improved.

One Another advantageous feature is that the at least first and second radiation source of the projection device comprises laser. It is advantageous if the emitted wavelengths of Laser a red, green or blue spectral range. The advantage of this is that With this choice of colors on lasers a wide range of colors is shown can be.

Farther It is advantageous if the electronic control for the first and second radiation source generates separate electronic signals. The has the advantage that each individual radiation source separately and so that each individual beam can be controlled separately. A possible temporal intensity variation the signal for a single beam is thus facilitated. It is still advantageous when an electronic signal for generating a Image is present, which includes video electronics. That has the advantage that a moving through the projection device Image can be generated.

One Another advantageous feature is when the electronic control for the Radiation source includes a driver for controlling the signal. The has the advantage that the electronic signals for the radiation sources more accurate and possibly faster transfer can be.

One Another advantageous feature of another embodiment is a first mirror for steering the at least first and second beam is present on the projection surface. It is still advantageous if the first mirror of an electronic driver is controlled. This has the advantage that the rays through the electronically controlled first mirror directed to the projection screen can be while controlling the movement of the first mirror independently of the rays can be.

Farther It is advantageous if a second mirror for steering the at least first and second beam is present on the detection device. It is advantageous that a detection of the rays on a Detector possible becomes.

One Another advantageous feature is a filter between the second mirror and the detection device is present. This Filter has the advantage that it has a desired beam to the detection device get through while he the other rays are filtered out.

Farther it is advantageous if diffractive between the second mirror and the detection device Elements are present. This has the advantage that the rays separated and after the diffractive element in different directions can be steered.

It is further advantageous when between the second mirror and the detection device, a lens for focusing the radiation is available. This has the advantage that the width of the rays, which arise for technical reasons, is minimized, and thus the detection the position of the projections of the beams on the detection device improved becomes.

One Another advantageous feature is a control unit, for example a chip with the first mirror and the detection device via reading Data lines is connected. This has the advantage that the electronic Control data from the orientation of the first mirror and the position of the detection device are supplied.

It is also advantageous if the control unit is connected via writing data lines to the driver of the first mirror and the electronic controller for the first and second radiation source. This has the advantage that the electronic control process the data that it has received over the reading data lines can and can forward new data to the driver of the first mirror and the electronic controller for the first and second radiation source.

Based the figures and the embodiments the invention should be closer explained become:

1 shows a schematic structure of a projection device with three radiation sources, eg. As laser, and projection screen.

2 shows the schematic structure of a projection device with three radiation sources, eg. As laser, and projection surface and a deviation of the beams from each other.

3 shows the schematic structure of an embodiment of the method for measuring the position of the rays.

4 shows the schematic structure for focusing the rays in the measurement setup by means of a lens.

5 shows the projections of the rays on the projection surface and the determination of the deviation from each other.

6 shows a schematic structure of a projection device for implementing the method for improving the image quality.

1 shows the schematic structure of a projection device with three radiation sources 100 . 200 and 300 , These radiation sources send the rays 110 . 210 , and 310 out. Since the three radiation sources can not all be placed in one place, the rays become the radiation source 200 and 300 over the deflection mirror 220 and 320 deflected and with the beam 110 brought into cover. The three rays hit the first mirror 400 that is mobile. About the movement of the first mirror 400 can the three rays 110 . 210 and 310 on the projection screen 10 be steered. By suitable movement of the mirror 400 becomes point by point on the screen 10 creates an image. This method of projecting an image is also called a "flying spot process." The three radiation sources 100 . 200 and 300 are in a preferred embodiment laser, which the beams 110 . 210 and 310 Are laser beams. It is convenient to choose the colors of the lasers red, blue and green. As a result, any number of colors in the color spectrum can be generated. A very diverse picture can thus on the projection screen 10 be generated. Ideally, the three rays are superimposed 110 . 210 and 310 through the in 1 shown construction exactly, so that the desired target impression is created. However, production-related minimum angular deviations lead to a deviation of the beams from each other, which leads to the emergence of a deviating from the target impression actual impression.

Such an angular deviation d is in 2 to see. Here you can see that the three rays 110 . 210 and 310 show a deviation from each other, which is also on the screen 10 reflects. Often it is not possible or very difficult to mechanically improve projection devices as far as possible in order to avoid such an angular deviation. Often the angles can change due to thermal stress during operation.

Therefore, in the present invention, as in 3 shown a measuring method for positioning the rays introduced. In 3 is, for example, the measurement of the position of the beam 110 to see. This one is about the moving first mirror 400 distracted and onto the projection screen 10 projected. Between the first mirror 400 and the projection screen 10 there is another second mirror 600 , This can be semi-transparent, which makes part of the beam 110 continue on the projection screen 10 however, another part of the beam can be projected from the mirror 600 is distracted. The deflected beam 110 is on a detector 500 projected. In the various embodiments of the invention, it is possible to determine the position of the beam 110 during operation of the projection device or prior to operation of the projection device. In a so-called off-line operation, although at the time of measuring the position of the beams, radiation is conducted in the direction of the projection surface, however, no image information is transmitted. The so-called online operation means that the measurement of the position of the beams is performed during the projection operation. Based on 3 Both offline operation and online operation can be explained.

Either in offline mode as well as in online mode can be two different Procedure performed become. One method has a variable mirror position and a stationary detector, the other method a variable detector position with defined mirror position.

As a first embodiment, the variant offline operation will be explained with fixed detector. In this case, only a single beam is in operation for carrying out the measurement of the position of the beams. The second mirror 600 can be semi-transparent or non-transparent, since it is not necessary that the beam must be projected onto the projection surface. The second mirror 600 however, should be positioned so that it at least partially targets the particular beam that is currently operating on a detector 500 with fixed Steering position. The respective beam pointing to the detector 500 is directed, thereby producing a projection on the detector. The first, movable mirror 400 is now moved until it is in an orientation at the detector 500 a maximum intensity of the respective beam is measured. This will be for every ray, for example the ray 110 . 210 and 310 individually performed. It is particularly advantageous if, for each of the beams, a further orientation of the first mirror 400 is determined at the first detector 500 the maximum intensity of the beam is measured. This contributes to increasing the measurement accuracy. The respective orientations of the first mirror 400 each can be contactless about the capacity between the first mirror 400 and a counterpart. It is also possible the orientations of the first mirror 400 to measure with a mechanical probe. Furthermore, the orientation of the mirror can each be determined by the fact that the first mirror 400 is irradiated with an additional beam, and whose deflection is determined by means of a second detector. It is advantageous if the additional beam is in each case arranged at an inclined angle to the beam which is currently in operation. From the measured orientations of the first mirror 400 then differences can be formed from the orientations of the mirror for the first beam, a second and a third beam. The determination of the orientation of the mirror and the difference of the orientations of the mirror for the respective beams serves to determine the actual deviation of the beams from each other. The measurement of the position of the beams can thus take place component-internally or -extern. From the difference in the orientations of the mirrors for the respective beams, an angular deviation between the beams can be determined.

Another embodiment of the invention is the measurement method of the beam position in offline mode with variable detector position. This is the first mirror 400 for each beam held in at least one fixed orientation. The detector 500 becomes for every ray, for example the rays 110 . 210 and 310 , In each case brought in a position at which a maximum intensity of the respective beam is measured at the detector. The measurement of the position of the detector can be done within the component. The component-internal measurement takes place without contact via the capacitance between the detector and a counterpart or by means of a mechanical sensor. If one wishes to avoid the measurement of the detector position, one can continue to use instead of a single detector, a plurality of detectors (detector array) for determining the positions of the projections of the beams. Thereby, the plurality of detectors are positioned so that all positions of the projections of the beams on the plurality of detectors can be measured without having to move the plurality of detectors. By sequentially measuring the positions of the projections of the steels on the plurality of detectors, an angular deviation between the beams is used, which is used to determine the actual deviation of the beams on the projection surface from each other.

In online operation is the second mirror 600 Semi-transparent and permanently installed to particularly advantageous to direct a portion of the rays on the projection surface to generate the image and at the same time to direct a different part of the rays on the detectors for determining the deviation of the beams from each other. In other words, all colors are in operation at the same time, which means that on the screen 10 an image is generated while simultaneously the position of the rays on a detector 500 is measured. The deflection of the rays, for example the rays 110 . 210 and 310 , on the detector 500 happens by means of the second mirror 600 , Since all beams are in operation at the same time, it is necessary to separate the beams in front of the detector 500 to introduce certain elements in the beam path. For this purpose, for example, a wavelength-selective filter, which is between the second mirror 600 and the detector 500 is available. This filter allows only one beam at a time to the detector 500 penetrate while the other rays are blocked. As a result, the position of the projection of a beam can be measured in each case. Another way of separating the rays is a diffractive element following the second mirror 600 is available. A diffractive element ensures that the beams are directed in different directions and thus also be separated.

In online operation with stationary detector, a plurality of detectors is used as the detector. The particular beam being directed at the plurality of detectors produces a projection on that plurality of detectors. The first mirror 400 is again brought into different orientations, in which the respective beams can be measured on the plurality of detectors with an intensity maximum. This can advantageously be carried out several times again for each beam and in each case a new orientation of the mirror can be determined. The orientations of the mirror 400 can each be measured within the component or externally. These are, for example, the non-contact measurement of the capacitance between the mirror 400 and a counterpart or the measurement with a mechanical probe. As an external variant, the irradiation can be used with an additional beam whose deflection is determined by means of another detector. This additional beam is advantageously angeord at an inclined angle to the other rays net. The thus determined orientations of the first mirror 400 are used to determine differences of mirror orientations for the respective beams. From these differences, angle deviations between the respective beams are again determined and from this the actual deviation of the beams on the projection surface is calculated.

Another option in online operation is the first mirror 400 to bring in defined orientations for each ray. A detector 500 can be brought into a position for each beam, in which the detector a maximum intensity of the respective beam is measured. The measurement of the position of the detector can be done within the component. The internal measurement is the non-contact measurement via the capacitance between the detector and a counterpart or the measurement with a mechanical probe.

In addition, a variety of detectors can be used which are positioned so that all projections of the beams can be measured simultaneously. In this case, a movement of the plurality of detectors is not necessary. From the positions of the projections of the beams on the plurality of detectors, an angular deviation between the respective beams can be determined. With the angular deviation, in turn, the actual deviation of the rays from each other on the projection surface 10 be determined. The difference between the two methods in online operation, once with a fixed detector and once with a fixed mirror, is that a signal is emitted at the fixed detector when the detector indicates a maximum intensity maximum. If the mirror is in a defined orientation, a signal is emitted if the mirror is in that defined orientation. Both signals ensure that the temporal intensity variation of the control of the radiation sources takes place.

In 4 schematically shows the focusing of the beams in front of the detector. The introduction of a lens 700 between the second mirror 600 and the detector 500 is particularly advantageous in order to bring about an improvement in the measuring accuracy. Every steel, for example the beam 110 , has a technical width a. This width can be minimized by the introduction of a lens. By the further introduction of a screen 750 between the lens 700 and the detector 500 the correct position of the beam can still be defined. By movement of the mirror 600 becomes the position of the projection of the beam 110 moved and can be brought into an orientation in which the beam is precisely through the aperture on the detector 500 meets. A focused beam gives a more accurate result on the position of its projection on the detector. The use of a diaphragm and lens can reduce the beam diameter to about 20 to 30 μm or even less.

In 5 is an example for determining the deviation of the projections of the rays on the projection surface 10 to see. The projections of the rays 110 . 210 and 310 are on the screen 10 as points 110a . 210a and 310a to see. The three points have, for example, a choice as a reference point 110a two deviations each. The point 210a deviates from the point 110a in x and y direction. The differences are as 210a_y and 210a_x designated. Similarly, the projection of the beam 310 . 310a a deviation in the y-direction and x-direction from the point of projection 110a on. These deviations are called 310a_y and 310a_x designated. Thus one obtains relative deviations of the projections from a selected reference projection point. From these deviations angle deviations can be determined. For example, the assumption that a pixel offset by one row and one column at a resolution of 1024 × 768, a projection distance of 1.5 m, and an image size of 42 cm × 29.7 cm results in an angular deviation of 0.015 ° in the row and 0.016 ° in the column. The angular deviations in turn lead to the determination of the actual deviations of the projections on the projection surface.

From the angular deviations, a phase shift of the beams can be determined from each other. The phase shift refers to the electronic signals for driving the respective beams. If the electronic signals of the respective beams are modulated by the phase shift which has been determined, which means a time delay of the individual beams, the desired color impression on the projection surface can be modulated 10 be restored.

6 schematically shows the implementation of the above-described embodiments of the invention in an embodiment of a projection device. There is a projection device to see there, the video electronics 800 which leads to the projection of moving or still images. Furthermore, a central control unit 900 present, preferably a chip. The video electronics 800 forwards data to the electronic control 30 for the radiation sources. The electronic control 30 for the radiation sources can be composed of delay elements 130a . 230a and 330a for every radiation source 100 . 200 and 300 as well as drivers for each radiation source 130b . 230b and 330b , The radiation sources, which are advantageously lasers, emit rays 110 . 210 and 310 to a movable first mirror 400 , This first mirror 400 is from a first electronic driver 450 driven. The first mirror 400 directs the rays on a projection screen. Between the mirror 400 and a detection device 550 to perform the measurements of the radiation positions is a second mirror 600 attached, which directs the rays in the desired direction. The detection device 550 is equipped according to the embodiments described above and may in particular comprise a first detector or a plurality of detectors. The control unit 900 is via reading data lines with the first mirror 400 , the detection device 550 and the electronic signal 800 connected to create an image. That is, the control unit 900 receives data about the orientation of the mirror 400 on the progress of the electronic signals to produce an image and the results of the measurements of the detection device 550 , Furthermore, the control unit 900 over writing data lines with the driver of the first mirror 450 , the electronic control 30 for the radiation sources and the electronic signal 800 connected to create an image. That is, the control unit 900 can use the data obtained, which it has received from the reading lines, revised data to the driver of the first mirror 450 send to the new orientation of this mirror, to the electronic control for the radiation sources to regulate the beams 110 . 210 and 310 and to the electronic signal 800 for generating an image for temporal intensity variation of the signals necessary under the new conditions. For example, so the delay elements 130a . 230a and 330a make sure that the radiation sources 100 . 200 and 300 At modulated times emit rays of modulated intensity to improve the image quality on the screen 10 to improve. From the determined mirror orientations for each beam phase shifts are determined from which control signals are sent to the delay elements.

The The invention is not by the description based on the embodiments limited. Much more includes the invention of each new feature as well as each combination of features, in particular any combination of features in the claims includes, even if this feature or this combination itself not explicitly in the patent claims or embodiments is specified.

Claims (70)

Method for projecting an image using at least a first ( 110 ) and second ( 210 ) Beam onto a projection surface ( 10 ), - by the superimposition of the projection of the first and second beam onto the projection surface a desired impression of the image is to be generated, - by an actual deviation (d) of the projection of the first and the second beam on the projection surface of the Target impression deviating actual impression of the image is generated, with the method steps A) determination of the actual deviation of the projection of the first of the second beam on the projection surface, B) temporal variation of the intensity of the first and / or second beam after that in the process step A) determined deviations to produce the desired impression. Method according to the preceding claim, wherein the at least first ( 110 ) and second ( 210 ) Ray for projection of the pixels by means of a first mirror ( 400 ) on the projection surface ( 10 ) is directed. Method according to the preceding claim, wherein the first mirror ( 400 ) is movable. Method according to one of the preceding claims 2 and 3, wherein the first mirror ( 400 ) is controlled electronically. Method according to one of the preceding claims, wherein the first ( 110 ) and second ( 210 ) Beam laser beams are used. Method according to the preceding claim, wherein the Wavelength range the laser beams a red, green or blue spectral range includes. Method according to one of the preceding claims, wherein the at least first ( 110 ) and second ( 210 ) Beam each having first and second temporal intensity variations generated by at least first and second electronic signals. Method according to one of the preceding claims, wherein for carrying out the method step A) between the first mirror ( 400 ) and the projection surface ( 10 ) a second mirror ( 600 ) and only a single beam is in operation at a time. Method according to the preceding claim, wherein as second mirror ( 600 ) a semi-transparent mirror or a deflection mirror is used. Method according to one of claims 8 or 9, wherein the second mirror ( 600 ) is oriented so as to at least partially direct the respective beam which is in operation to a detector ( 500 ) with a fixed position. Method after the previous one claim, wherein the respective beam which is incident on the detector ( 500 ), generates a projection on the detector. Method according to one of claims 10 and 11, wherein the respective beam which is in operation, by means of a front of the detector ( 500 ) existing lens ( 700 ) is focused. Method according to claim 10, wherein the first mirror ( 400 ) for the first beam ( 110 ) is brought into a first orientation, in which at the detector ( 500 ) a maximum intensity of the first beam is measured. Method according to claim 10 or 13, wherein the first mirror ( 400 ) for the second beam ( 210 ) is brought into a second orientation, in which at the detector ( 500 ) a maximum intensity of the second beam is measured. Method according to claim 10, wherein for the first beam ( 110 ) a third orientation of the first mirror ( 400 ) at which the first beam has a maximum intensity on a second detector. Method according to the preceding claim, wherein for the second beam ( 210 ) a fourth orientation of the first mirror ( 400 ) at which the second beam has a maximum intensity on a second detector. Method according to one of claims 13 to 16, wherein the first and second and / or the third and fourth orientation of the first mirror ( 400 ) is measured contactlessly via the capacitance between the mirror and a counterpart, and from the difference between the first and second and / or the third and fourth orientations of the first mirror the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to one of claims 13 to 16, wherein the first and second and / or the third and fourth orientation of the first mirror ( 400 ) is measured with a mechanical probe and from the difference between the first and second and / or the third and fourth orientation of the first mirror, the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to one of claims 13 to 16, wherein the first and second and / or the third and fourth orientation of the first mirror ( 400 ) is determined in each case by the fact that the first mirror is irradiated with an additional beam and whose deflection is determined by means of a second detector, wherein the orientation of the first mirror is determined by the deflection of the additional beam. Method according to the preceding claim, wherein the additional one Beam at an inclined angle to the at least first and second beam is arranged. Method according to one of claims 13 to 20, wherein from the first and second and / or the third and fourth orientation of the first mirror ( 400 ) an angular deviation between the first ( 110 ) and second ( 210 ) Beam is detected, which is used to determine the actual deviation (d) of the first and second beam on the projection surface ( 10 ) is used. Method according to one of claims 8 or 9, wherein during method step A) the first mirror ( 400 ) is maintained in at least one fixed orientation for each beam. Method according to the preceding claim, wherein a detector ( 500 ) for the first beam ( 110 ) in a first position and for the second beam ( 210 ) is brought into a second position, in which a maximum intensity of the respective beam is measured at the detector. Method according to the preceding claim, wherein the first and second positions of the detector ( 500 ) is measured without contact via the capacitance between the detector and a counterpart, and the difference between the first and second position of the detector is used to determine the actual deviation of the first and second beam. Method according to claim 23, wherein the first and second positions of the detector ( 500 ) is measured with a mechanical probe and from the difference between the first and second position of the detector, the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to claim 22, wherein for determining the position of the projection of the beams on the detector ( 500 ) a plurality of detectors is present. Method according to the preceding claim, wherein the variety of detectors is positioned so that all positions the projections of the beams are measured on the plurality of detectors can. Method according to one of claims 26 or 27, wherein the respective beam which is in operation, by means of a present in front of the plurality of detectors lens ( 700 ) is focused. A method according to any one of claims 26 to 28, wherein from the positions of the projection of the beams on the plurality of detectors, an angular deviation between the first ( 110 ) and second ( 210 ) Beam is detected, which is used to determine the actual deviation (d) of the first and second beam on the projection surface ( 10 ) is used. Method according to one of the preceding claims, wherein a third beam ( 310 ) whose deviation from the first ( 110 ) and / or second ( 210 ) Beam according to the method according to one of the preceding claims. Method according to claims 1 to 7, wherein for carrying out the method step A) between the first mirror ( 400 ) and the projection surface ( 10 ) a second semi-transparent mirror ( 600 ) is positioned and all beams are simultaneously in operation, where they produce the actual impression on the projection surface. Method according to the preceding claim, wherein the beams are separated by means of the second mirror ( 600 ) partially to a detector ( 500 ) are steered. Method according to the preceding claim, wherein a filter is arranged between the second mirror for separating the beams ( 600 ) and the detector ( 500 ) is available. A method according to claim 32, wherein for the separation of the beams a diffractive element after the second mirror ( 600 ) is available. Method according to the preceding claim, wherein as detector ( 500 a plurality of detectors is used and the respective beam directed to the plurality of detectors generates a projection on the plurality of detectors. A method according to any one of claims 33 to 35, wherein said plurality of detectors has a fixed position. Method according to the preceding claim, wherein the first mirror ( 400 ) is brought into a first orientation, in which the plurality of detectors an intensity maximum of the first beam ( 110 ) measures. Method according to the preceding claim, wherein the first mirror ( 400 ) is brought into a second orientation, in which the plurality of detectors an intensity maximum of the second beam ( 210 ) measures. Method according to claim 36, wherein the first mirror ( 400 ) is brought into a third orientation, in which the plurality of detectors an intensity maximum of the first beam ( 110 ) measures. Method according to claim 36, wherein the first mirror ( 400 ) is brought into a fourth orientation, in which the plurality of detectors an intensity maximum of the second beam ( 210 ) measures. Method according to one of claims 37 to 40, wherein the first and second and / or the third and fourth orientation of the first mirror ( 400 ) is measured in each case without contact via the capacitance between the mirror and a counterpart, and from the difference between the first and second and / or the third and fourth orientations of the first mirror the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to one of claims 37 to 40, wherein the first and second and / or the third and fourth orientation of the first mirror ( 400 ) is measured in each case with a mechanical probe, and from the difference between the first and second and / or the third and fourth orientations of the first mirror, the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to one of claims 37 to 40, wherein the first and second and / or the third and fourth orientation of the first mirror ( 400 ) is determined in each case by the fact that the first mirror is irradiated with an additional beam and whose deflection is determined by means of a second detector, wherein the orientation of the first mirror is determined by the deflection of the additional beam. Method according to the preceding claim, wherein the additional one Beam at an inclined angle to the at least first and second beam is arranged. Method according to one of claims 37 to 44, wherein from the first and second and / or the third and fourth orientation of the first mirror ( 400 ) an angular deviation between the first and second beam is determined, which is used to determine the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam on the projection surface ( 10 ) is used. Method according to one of claims 31 to 45, wherein in step a) the first mirror ( 400 ) has at least one defined orientation for each beam. Method according to the preceding claim, wherein a detector ( 500 ) for the first beam ( 110 ) in a first position and for the second beam ( 210 ) is brought to a second position, in the at the detector a maximum intensity of the respective beam is measured. Method according to the preceding claim, wherein the first and second positions of the detector ( 500 ) is measured contactlessly via the capacitance between the detector and a counterpart, and from the difference between the first and second position of the detector the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to claim 47, wherein the first and second positions of the detector ( 500 ) is measured with a mechanical probe and from the difference between the first and second position of the detector, the actual deviation (d) of the first ( 110 ) and second ( 210 ) Beam is detected. Method according to claim 46, wherein for determining the position of the projection of the beams on the detector ( 500 ) a variety of detectors is used. Method according to the preceding claim, wherein the variety of detectors is positioned so that all projections the beams on the plurality of detectors can be measured. A method according to any one of claims 50 to 51, wherein the respective beam is detected by means of a lens (15) present in front of the plurality of detectors. 700 ) is focused. Method according to one of claims 50 to 52, wherein from the positions of the projection of the beams on the plurality of detectors, an angular deviation between the first ( 110 ) and second ( 210 ) Beam is detected, which is used to determine the actual deviation (d) of the first and second beam on the projection surface ( 10 ) is used. Method according to one of the preceding claims, wherein a third beam ( 310 ) whose deviation from the first ( 110 ) and / or second ( 210 ) Beam is determined by the method according to claims 31 to 53. Method according to one of the preceding claims, wherein from the angular deviations determined in method step A) Phase shift of an at least first electronic signal relative is determined to a second electronic signal, wherein the electronic signals control the intensity of the respective beams. Method according to the preceding claim, wherein in process step B) the desired impression by temporal intensity variation of the first and / or second electronic signal by means of the determined Phase shift is restored from the actual impression. Projection device, comprising - at least a first ( 100 ) and second ( 200 ) Radiation source for generating a first ( 110 ) and second ( 210 ) Beam, - a projection device for projecting the first and second beam onto a projection surface ( 10 ), whereby an image is projected on the projection surface, - an electronic control ( 30 ) for the first and second radiation source, - a detection device ( 550 ) for detecting a deviation (d) between the projection of the first and second beam on the projection surface, wherein the projection device is arranged such that, depending on the detected by the detection device deviation (d) between the projection of the first and second beam on the projection screen ( 10 ) the electronic control for the first and / or second radiation source can be delayed so that the deviation is reduced or corrected. Projection device according to the preceding claim, wherein the at least first ( 100 ) and second ( 200 ) Radiation source comprises laser. Projection device according to one of claims 57 and 52, wherein the emitted wavelengths of the lasers have a red, green or blue spectral range. Projection apparatus according to claim 57, wherein said electronic control ( 30 ) for the first ( 100 ) and second ( 200 ) Radiation source generates separate electronic signals. Projection apparatus according to claim 57, wherein A control unit is present that controls the electronic controls for the Radiation sources in dependence from the detected deviation (d) controls. Projection apparatus according to claim 57, wherein said electronic control ( 30 ) for the radiation source comprises a driver for controlling the signal. Projection device according to one of claims 57 to 62, wherein the projection device comprises a first mirror ( 400 ) for steering the at least first ( 110 ) and second ( 210 ) Beam onto the projection surface ( 10 ). Projection device according to the preceding claim, wherein the first mirror ( 400 ) from an electronic driver ( 450 ) is driven. Projection device according to one of claims 57 to 64, wherein the projection device comprises a second mirror ( 600 ) for steering the at least first ( 110 ) and second ( 210 ) Beam onto the detection device ( 550 ). Projection device according to the preceding claim, wherein between the second mirror ( 600 ) and the detection device ( 550 ) a filter is present. Projection device according to claim 66, wherein between the second mirror ( 600 ) and the detection device ( 550 ) diffractive elements are present. Projection device according to claim 66, wherein between the second mirror ( 600 ) and the detection device ( 550 ) a lens ( 700 ) is present for focusing the rays. Projection device according to one of the preceding claims 57 to 68, wherein a control unit ( 900 ) present with the first mirror ( 400 ), the detection device ( 550 ) is connected to generate an image via read data lines. Projection device according to the preceding claim, wherein the control unit ( 900 ) over writing data lines with the driver of the first mirror ( 450 ), the electronic control ( 30 ) is connected to the first and second radiation sources.