Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B21/00—Projectors or projection-type viewers; Accessories therefor
  • G03B21/14—Details
  • G03B21/20—Lamp housings
  • G03B21/2066—Reflectors in illumination beam
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
  • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
  • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
  • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
  • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
  • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
  • G02B27/104—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with scanning systems
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/14—Beam splitting or combining systems operating by reflection only
  • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/30—Collimators
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B21/00—Projectors or projection-type viewers; Accessories therefor
  • G03B21/14—Details
  • G03B21/20—Lamp housings
  • G03B21/2006—Lamp housings characterised by the light source
  • G03B21/2033—LED or laser light sources
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
  • H01S5/00—Semiconductor lasers
  • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
  • H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
  • H01S5/00—Semiconductor lasers
  • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
  • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3141—Constructional details thereof
  • H04N9/315—Modulator illumination systems
  • H04N9/3155—Modulator illumination systems for controlling the light source
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3141—Constructional details thereof
  • H04N9/315—Modulator illumination systems
  • H04N9/3164—Modulator illumination systems using multiple light sources
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3179—Video signal processing therefor
  • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
  • H01S5/00—Semiconductor lasers
  • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
  • H01S5/00—Semiconductor lasers
  • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
  • H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
  • H01S5/00—Semiconductor lasers
  • H01S5/02—Structural details or components not essential to laser action
  • H01S5/022—Mountings; Housings
  • H01S5/023—Mount members, e.g. sub-mount members
  • H01S5/02325—Mechanically integrated components on mount members or optical micro-benches
  • H01S5/02326—Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
  • H01S5/00—Semiconductor lasers
  • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
  • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
  • H01S5/4087—Array arrangements, e.g. constituted by discrete laser diodes or laser bar emitting more than one wavelength
  • H01S5/4093—Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion

Definitions

• the invention relates to a method for producing a light module, light module and method for operating a light module and computer program product
• Light module a light module and a method for operating ei ⁇ nes light module and a computer program product according to the preamble ⁇ term of the independent claims.
• Light modules are already known, in which light is combined with ⁇ Kunststoffaji wavelengths in a beam and is then directed onto a screen.
• a projection module which three light sources each on a dichroic
• the dichroic mirrors are individually positioned during manufacture and their positions and position adjusted so that the respective light color is just above the second and third light color. Such a manufacturing process is very complicated and expensive.
• the object is achieved by a method for the production of a light module, which comprises the following steps:
• a beam combining device which comprises at least one dichroic mirror per laser diode, the respective dichroic mirrors being at a distance from one another,
• the dichroic mirrors are simultaneously placed on the base plate.
• a positioning module is designed such that it allows a simp ⁇ che positioning of the collimating lens, while the light source and preferably also the beam combining device is attached to the housing.
• the positioning module is preferably a part of the device and remains in the housing even after production.
• the positioning module preferably has a dimensioning of a maximum of 3x3x3 mm.
• the positioning module can be a cube or a six-sided prism. Also possible would be an eight- or more-sided prism.
• the individual lateral surfaces of the prism serve as standing surfaces for the prism, so that, for example, six base surfaces are formed in a six-sided prism.
• a positioning module has a front side and a rear side with the front side oriented toward the light source and the rear side away from the light source. Front and back are connected by side surfaces on which the positioning module can be placed. Between the front and back of a Kol- is delimiting lens arranged so that the light from the Lichtquel ⁇ le is orientalstrahlbar by the collimating lens. The collimating lens in the positioning module is arranged eccentrically, so that a distance between the collimating lens and the individual side surfaces is different.
• the individual dichroic mirror can be set so, is that their position and orientation within a predefined tolerance ranz Kunststoffes spaced from each other, wherein the Toleranzbe ⁇ rich in the range of +/- 0.01 mm, in particular +/- 0.005 mm, in the position of the dichroic Mirror from each other and / or the location in the range +/- 4 mrad, in particular +/- 2 mrad with respect to the normal of the bottom plate and / or with respect to another dichroic mirror.
• the position of the dichroic mirrors in the context of the invention means that the distance between the individual mirrors corresponds to one another in such a way that the distances between the individual mirrors are equal to one another. half of the specified tolerance range are the same. In the event that deviates and the position of a normal line, the posi tions of the ⁇ levels are measured in their position towards the base plate at the bottom of the dichroic mirror and, if necessary aligned as a unit.
• a beam shaping module in particular a prism telescope, can furthermore be placed on the base plate.
• the prisms of the prism telescope preferably do not touch each other.
• Individual elements of the beam forming module can be set from one another and preferably from the beam combination Nati ⁇ onsvortechnisch in a tole ⁇ ranz Symposium.
• the tolerance range can range from +/- 0.01 mm, in particular +/- 0.005 mm, insbesonde ⁇ re in the position of Ele ⁇ elements of the beam shaping module and preferred view of the dichroic mirror and the location in the range of +/- 4mrad, +/- 2 mrad, with respect to the normal of the bottom plate and / or with respect to a dichroic mirror.
• the arrangement of the beam combiner, and preferably also the beamforming module, may be aligned with one of the light sources.
• one of the light sources is at least optimally aligned and the accuracy is increased without the manufacturing costs to raised stabili ⁇ hen.
• One or more MEMS mirrors may be set so that the emitted light from the laser diodes after passing through the
• Beam combining device and the beam shaping module or the MEMS mirror meets. Through one or more MEMS mirrors, the light from the
• Projected light module out and an image are generated.
• Deviations of the emitted light of a light source with respect to the emitted light of a further light source can be corrected by a digital correction of the video data in front of the light source control so that an optimally superimposed beam of emitted light of the light sources is produced.
• the light module is produced with optimized manufacturing costs and at the same time projecting such a precise beam onto a projection surface that no distortions or sharp edges are produced.
• a light module for generating light comprising a light source holder, in particular diode holder, with at least two, preferably three Lichtquel ⁇ len, in particular laser diodes, preferably pressed Laserdio ⁇ the.
• the module comprises in each case one collimating lens per laser diode, preferably one collimating lens each in a positioning module, and one beam combining device, each comprising a dichroic mirror per laser diode for combining the light emitted by the respective laser diodes.
• the light source holder, the collimating lenses and the beam combining device are preferably arranged on a base plate.
• the dichroic mirrors are arranged in front of one another within a predefined tolerance range and are at a distance from each other, the tolerance range in the range of +/- 0.01 mm, in particular +/- 0.005 mm, in the position of the dichroic mirrors from one another and / or the position is in the range of +/- 4 mrad, in particular +/- 2mrad with respect to the normal of the bottom plate and / or with respect to another dichroic mirror.
• Such a light module can be produced inexpensively.
• the light module may comprise a beam shaping module, preferably a prism telescope, which is preferably arranged on the base plate.
• a beam-shaping module optimizes the combined beam in its shape.
• the light module can comprise a light source control, by means of which the light sources can be controlled.
• a light source control by means of which the light sources can be controlled.
• the light module may comprise one or more MEMS mirrors, which is preferably arranged on the bottom plate.
• the MEMS mirror or the combined beam from the light module can be Ragarij ied so that the beam is Beweg ⁇ Lich and can generate a complete picture.
• the MEMS or the mirror is controlled by the light source control.
• Individual elements of the beam shaping module can preferably be arranged on the beam combination Nati ⁇ onsvoriques from each other and in a tole ⁇ ranz Symposium.
• the tolerance range can be in the range of +/- 0.01 mm, in particular +/- 0.005 mm, in the position of the elements of the beam shaping module and preferably by the dichroic mirrors and / or the position in the range of +/- mrad, in particular + / - 2 mrad, with respect to the normal of the bottom plate and / or with respect to a dichroic mirror.
• a positioned in such a tolerance range beam combining device allows an optimized shaping of the combined beam and is also cost-mon ⁇ tierbar.
• the beam-shaping module may comprise individual elements of at least two different glass materials.
• Different glass materials in the context of this invention are glasses with different refractive index and / or different dispersion.
• the splitting of the colors, ie the offset among each other, is reduced by the prism telescope.
• At least one red, one green and one blue laser diode can be formed, wherein the red laser diode is arranged in the diode holder next to the blue laser diode.
• the laser diode having the greatest power loss at higher temperatures is located next to the laser diode having the least heat generation.
• two red, a green and a blue Laserdio de ⁇ be formed, wherein the two red are juxtaposed angeord ⁇ net, the green next to the red and the blue next to the grü ⁇ nen is arranged.
• the dichroic mirrors can be made simpler, since they do not have to be a bandpass.
• the light module may comprise a correction unit, can be corrected by the deviation of the emitted light of a light source with respect to the emitted light to a second light source through a di ⁇ gitale correction calculation of the video data, so that an optimal superimposed beam of emitted light of the light sources is produced.
• the correction unit is formed by a video processing section, in particular preferably an application-specific integrated circuit (ASIC) or a video controller.
• ASIC application-specific integrated circuit
• the object is further achieved by a light module, which is produced by a method as described above.
• Such a light module has optimized manufacturing costs.
• Light sources preferably laser diodes
• the one or more MEMS mirrors and / or the light sources can be controlled by the light source control with correction unit such that deviations in the superposition between the light of the individual light sources are corrected, in particular the time of the laser pulses and the laser power (color value) are adjusted ,
• the combined light or the light generated in each case can be formed by a beam-shaping device, in particular a prism telescope.
• the object is further achieved by a computer program product that can be loaded directly into the internal memory of a digital computer or stored on a medium and includes software code sections that perform the steps as described above when the product is run on a computer ,
• the computer program product is embodied in the correction unit.
• the image quality is optimized.
• the computer program product may be a video processing path that is imaged in hardware or hardware-related software in an ASIC or video controller in front of a light source control, in particular laser control, and digital Rechenope ⁇ rations with which the position and the color value of the projected pixels are corrected be formed as previously described for controlling one or several ⁇ rer MEMS mirror in a light module, in particular a light ⁇ module.
• the light ⁇ module includes one or more MEMS mirrors and a light source control, in particular laser control, the o- of the MEMS mirror and the light sources are addressed by the Lichtquel ⁇ len interviewedung with correction unit such that deviations in the superposition between the Light of individual light sources of the light module can be corrected, in particular the timing of the laser pulses and the laser power (color value) can be adjusted.
• dislocation of components in the optical path can be tolerated as the individual projected Color channels, so in particular emitted light in each case a light source, depending on their individual error such in the digital video processing of the projector, so in particular light module with MEMS mirror or mirrors are corrected, that the individual pixels of the color channels despite divergence within a Frames of a projector image come to rest on each other, preferably with an accuracy of ⁇ 0.25 pixels.
• the position of the projected pixels in image distortion due to the optical path is called the projector coordinate.
• a distortion of the image can first be determined on the basis of exactly one reference channel and, preferably, correction terms for each individual pixel can be calculated.
• the reference channel can be formed for example by any light source.
• each testified spots of each color channel be relative to the reference channel ⁇ true and will be added to the correction term of the distortion.
• the correction term for the offset is of a lower order than the correction term for the distortion, so that an optimal image with less computational power is achieved.
• first distortion correction with a correction term is determined for only one reference channel, ie a color channel, with which all pixels of the video ⁇ source (geometry geometry eg right-angled representation with 16: 9 format) can be transferred to the system of the projector coordinates, which are usually strongly from rectangular video format of the image source.
• the reference channel used for this image distortion correction may be one of the laser channels used, but it is also possible, for example, to choose the geometric center from all the laser channels in order to determine the correction terms. In any case, only one channel is used for image distortion correction determination.
• misalignment in the beam path in particular by Albertjusta- ge of components within the laser module, there may be an offset of the spots (pixels) of the different laser in the projection plane.
• the correction is performed ⁇ ses offset within the video processing sequence after the distortion correction of the reference channel.
• the distortion correction is performed on a higher-order polynomial such as a 5th-order polynomial.
• the translational correction of the position (offset) of each active color channel relative to the reference channel is determined, in particular, by a lower order polynomial (eg, 3.
• FIG. 1 shows a schematic representation of a light module
• FIG. 3 shows a schematic representation of a light module with MEMS mirror
• Fig. 4 shows an example of an image distortion in Giorko ⁇ ordinate system (stars) compared to the undistorted image (crosses),
• FIG. 6 shows the schematic sequence of the specific correction of translational offset of different laser channels.
• 1 shows a schematic representation of a light module 1 with four light sources 2, which are pressed in the light source holder 3.
• the light sources 2 are laser diodes, the laser diode 2a emitting red light, the laser diode 2b emitting blue light, and the laser diode 2c emitting green light.
• a second red laser diode 2d is formed.
• a polarization adjustment device To the light of the two red laser diode 2a, to be able to combine the beam 4 in combination ⁇ nation device 2d, wherein one of the two laser diodes, a polarization adjustment device
• the beam combination device 4 comprises four dichroic mirrors 5a, 5b, 5c and 5d. All elements of the beam combination device 4 are simultaneously placed on the bottom plate 7 and thus are in a predefined tolerance range. Between the respective laser diodes 2 a, 2 b, 2 c and 2 d and the Strahlkombinati ⁇ onsvorraum 4 is ever a positioning module 8, each with a collimating lens 6 is arranged.
• the collimating lens 6 in the positioning module 8 is arranged asymmetrically, so that the distance of the lens from the side walls perpendicular to the propagation direction of the light is different in each case.
• Light module 1 further comprises a beam-shaping module 9 in the form of a prismatic telescope.
• the beam shaping module 9 becomes equal ⁇ temporarily placed with the beam combining device 4 on the bottom plate. 7
• the elements of the beam combination device 4 and of the beam-shaping module 9 are not further aligned after being placed on the base plate 7.
• Figure 2 shows a perspective view of the light module ge ⁇ Gurss Figure 1.
• the perspective view which is approximately Kollimie- lens 6 in the positioning module 8 be seen, which is arranged within the positioning module 8 asymmetric.
• the distance of the collimating lens 6, or its Linsenmit ⁇ teluss of the side surfaces that are not in spread direction of the light are located or are not directed to the light sources 2 (see Figure 1), in each case different ⁇ lich.
• 3 shows a light module according to FIG 1, wherein the Lichtmo ⁇ dul 1 further comprises a MEMS mirror 10 and a Lichtettinsteu ⁇ augmentation 12 with correction unit.
• the MEMS mirror 10 and the light sources 2 are addressed by the light source controller 12 having a correction unit in such a way that deviations from an optimal superposition of the emitted radiation of the individual light sources are corrected during projection by the MEMS mirror 10, in particular by adjusting the time the laser pulses and the laser power.
• a correction is achieved by a correction unit, which is preferably integrated as a video processing path in the control of the MEMS mirror 10 and the light sources 2 in the light source controller 12.
• the light deflected by the MEMS mirror 10 is guided through exit window 11 onto a projection surface.
• Figure 4 shows the principle of transferring the coordinates of a picture or video source (for example, 16: 9, rectangular Geo ⁇ geometry, 854x480 resolution) in the target coordinate system of the projector (non-rectangular geometry due to distortion caused by the optical path).
• a picture or video source for example, 16: 9, rectangular Geo ⁇ geometry, 854x480 resolution
• the displacement of exemplary individual pixels from the coordinate system of the image or video source (1,1), (1,2) or (2,1) into the projector coordinate system (1 ⁇ , 1 ⁇ ), ( 1 ⁇ , 2 ⁇ ) or (2 ⁇ , 1 ⁇ ).
• This image distortion must be eliminated with a correction term of relatively high order, for example, fifth order. This will be exclusively for the
• a flying spot laser raster scanner always deviates from the ideal pixel position, so that the pixels in the projector coordinate system can deviate greatly from the target geometry (see black stars).
• the coordinates of the projector coordinate system (black stars) are now linked to the color values of the original video image in the target geometry (gray crosses).
• the color value of the projector coordinate (2 2 ⁇ ) is determined, for example, by interpolation of the video coordinates (1,1) and (1,2).
• This correction is smaller, the smaller the deviation between Strorkoordinate and Zielko ⁇ ordinate or video coordinate.
• the deviation can be determined by means of a camera system. From this, correction terms are calculated for each pixel (polynomial correction eg 5th order).
• FIG. 5 shows the pixel offset in the projector coordinate system with an offset of two laser channels.
• the correction of this offset can be done with a small residual error already with lower order correction terms.
• Figure 6 shows the basic scheme of pixel translation correction.
• function blocks are the function blocks:
• Rasterizer defines the nonlinear coordinate system of the projection (projector coordinates) whose position depends on the geometries in the laser scanner along the optical path (angle of incidence laser to movable mirror axes, angle between the MEMS mirror axes, scan angle ). For this purpose, distortion parameters are read in by means of a camera system.
• 5th order polynomial X (Y) recalculation of the pixel information for the reference channel in the space of the projector coordinates for X and Y coordinates from the values of the video source (standard video format / geometry).
• correction with fifth order polynomial correction with fifth order polynomial.
• 3rd order polynomial additional correction of the pixel position per color channel in relation to the reference channel with a polynomial of lower order (in this case specific third order).

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• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• General Physics & Mathematics (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Engineering & Computer Science (AREA)
• Condensed Matter Physics & Semiconductors (AREA)
• Electromagnetism (AREA)
• Geometry (AREA)
• Mechanical Optical Scanning Systems (AREA)
• Transforming Electric Information Into Light Information (AREA)
• Projection Apparatus (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)
• Mechanical Light Control Or Optical Switches (AREA)
• Semiconductor Lasers (AREA)

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Publications (1)

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• 2016
  • 2016-01-11 EP EP16150760.3A patent/EP3190790A1/de not_active Withdrawn
• 2017
  • 2017-01-02 WO PCT/EP2017/050022 patent/WO2017121654A1/de not_active Ceased
  • 2017-01-02 JP JP2018536153A patent/JP2019503079A/ja active Pending
  • 2017-01-02 US US16/068,795 patent/US20190025686A1/en not_active Abandoned
  • 2017-01-05 DE DE102017200101.1A patent/DE102017200101A1/de not_active Withdrawn
  • 2017-01-09 JP JP2018535837A patent/JP6594552B2/ja not_active Expired - Fee Related
  • 2017-01-09 WO PCT/EP2017/050322 patent/WO2017121698A1/de not_active Ceased
  • 2017-01-09 EP EP17700170.8A patent/EP3424215B1/de active Active
  • 2017-01-09 US US16/067,177 patent/US10747095B2/en active Active
  • 2017-01-09 CN CN201780006330.3A patent/CN108463999B/zh active Active

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