US20050140930A1 - Color laser projection display - Google Patents

Color laser projection display Download PDF

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Publication number
US20050140930A1
US20050140930A1 US10/837,022 US83702204A US2005140930A1 US 20050140930 A1 US20050140930 A1 US 20050140930A1 US 83702204 A US83702204 A US 83702204A US 2005140930 A1 US2005140930 A1 US 2005140930A1
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United States
Prior art keywords
laser
lasers
light
display
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/837,022
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English (en)
Inventor
Paul Dvorkis
Ron Goldman
Narayan Nambudiri
Carl Wittenberg
Chinh Tan
Miklos Stern
Dmitriy Yavid
Frederick Wood
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Symbol Technologies LLC
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Symbol Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Symbol Technologies LLC filed Critical Symbol Technologies LLC
Priority to US10/837,022 priority Critical patent/US20050140930A1/en
Assigned to SYMBOL TECHNOLOGIES, INC. reassignment SYMBOL TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DVORKIS, PAUL, GOLDMAN, RON, NAMBUDIRI, NARAYAN, STERN, MIKLOS, YAVID, DMITRIY, TAN, CHINH, WITTENBERG, CARL, WOOD, FREDERICK F.
Priority to EP04815050A priority patent/EP1700488A1/en
Priority to JP2006547262A priority patent/JP2007525699A/ja
Priority to PCT/US2004/042929 priority patent/WO2005067313A1/en
Publication of US20050140930A1 publication Critical patent/US20050140930A1/en
Priority to US11/582,914 priority patent/US7445339B2/en
Abandoned legal-status Critical Current

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    • 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
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing

Definitions

  • This invention relates generally to electronic displays, and, more particularly, to a laser projection display.
  • Electronic displays have historically suffered from a number of shortcomings, including high cost, lack of durability, size, weight, limited flexibility and the like.
  • the present invention is directed to overcoming, or at least reducing, the effects of one or more of the problems set forth above.
  • an apparatus for displaying information in vehicle comprises a laser projector and a viewing surface positioned to receive a variable image from the laser projector.
  • FIG. 1 is a stylistic block diagram of a top level view of one embodiment of the present invention
  • FIG. 2 is a stylistic view of a viewing surface shown in FIG. 1 ;
  • FIGS. 3A and 3B depict a top view of a scanning device at various times during its operation
  • FIG. 4 depicts a laser projection display with varying resolution at varying distances
  • FIG. 5 depicts one embodiment of a laser projection display employing multiple green lasers
  • FIG. 6 depicts a laser projection display employing a plurality of screens
  • FIG. 7 depicts a screen for a laser projection display that may be viewed from opposite sides
  • FIG. 8 depicts a cylindrical rotating screen for a laser projection display
  • FIG. 9 depicts a laser projection display with a laser pointer
  • FIG. 10 depicts an alternative embodiment of a laser projection display with a laser pointer
  • FIG. 11 depicts a laser projection display with an interlock sensor
  • FIG. 12 depicts a laser projection display with a folded mirror arrangement
  • FIGS. 13A-13E depict various designs for a 3-dimensional laser projection display.
  • the LPD 100 includes three lasers 102 , 104 , 106 , each capable of emitting a beam of light 108 , 110 , 112 consisting of a unique color, such as red, green or blue.
  • a unique color such as red, green or blue.
  • the lasers 102 , 104 , 106 are arranged in a common plane 114 with the beams of light 108 , 110 , 112 being angularly directed relative to one another to fall on a substantially common location 116 on a first scanning device, such as a first scanning mirror 118 , from where they are reflected as beams of light 120 , 122 , 124 .
  • a first scanning device such as a first scanning mirror 118
  • the first scanning mirror 118 oscillates on an axis 120 at a relatively high rate (e.g., about 20-30 KHz). Rotation or oscillation of the first scanning mirror 118 causes the beams of light 108 , 110 , 112 to be moved.
  • the angular position of the first scanning mirror 118 alters, so to does the angle of reflection of the beams of light 120 , 122 , 124 from the first scanning mirror 118 .
  • the reflected beams of light 120 , 122 , 124 are scanned to produce movement of the beams of light 120 , 122 , 124 along one component of the two-dimensional display.
  • the second component of the two-dimensional display is produced by a second scanning device, such as a mirror 126 .
  • the second mirror 126 is coupled to a motor 128 at a pivot point 130 so as to produce rotational or oscillating movement about an axis that is substantially orthogonal to the axis of rotation of the first mirror 118 .
  • the beams of light 120 , 122 , 124 are reflected off of the second mirror 126 as beams of light 132 , 134 , 136 and directed to a viewing surface 138 .
  • the viewing surface 138 may take on any of a variety of forms without departing from the spirit and scope of the instant invention.
  • the viewing surface 138 may be a fixed screen that may be front or back lit by the lasers 102 , 104 , 106 and may be contained in a housing (not shown) that is common with the LPD 100 , or alternatively, the viewing surface 138 may take the form of any convenient, generally flat surface, such as a wall or screen, spaced from the LPD 100 .
  • the second mirror 126 oscillates or rotates at a relatively slow rate, as compared to the rate of the first mirror 118 (e.g., about 60 hz).
  • the beams of light 132 , 134 , 136 generally follow a path 140 on the display surface 138 .
  • the path 140 is similar in shape and concept to a raster scan commonly employed in cathode ray tube televisions and computer monitors.
  • first and second scanning mirrors 118 , 126 While the instant invention is described herein in the context of an embodiment that employs separate first and second scanning mirrors 118 , 126 , those skilled in the art will appreciate that a similar path 140 may be produced by using a single mirror.
  • the single mirror would be capable of being moved about two axis of rotation to provide the fast and slow oscillating movements along two orthogonal axes.
  • a controller 142 is provided to controllably energize the lasers 102 , 104 , 106 to effectively cause the beams of light 120 , 122 , 124 to appear to be collinear, such that they may be reflected off of the second mirror 126 and delivered to the same point on the viewing surface 138 (even though at different times) relatively independent of the distance of the viewing surface 138 from the second mirror 126 .
  • FIGS. 3A and 3B the operation of the controller 142 to cause the beams of light 120 , 122 , 124 to be collinear is discussed.
  • the controller 142 to cause the beams of light 120 , 122 , 124 to be collinear is discussed.
  • FIG. 3A if the lasers 102 , 104 are energized simultaneously, the reflected beams of light 120 , 122 diverge.
  • FIG. 3A if the lasers 102 , 104 are energized simultaneously, the reflected beams of light 120 , 122 diverge.
  • FIG. 3A if the lasers 102 , 104 are energized simultaneously, the reflected beams of light 120 , 122 diverge.
  • FIG. 3A if the lasers 102 , 104 are energized simultaneously, the reflected beams of light 120 , 122 diverge.
  • FIG. 3A if the lasers 102 , 104 are energized simultaneously, the reflected beams of light 120 ,
  • the beams of light 120 , 122 can be made to follow a single, common path (i.e., the beams of light 120 , 122 are collinear). For example, if the laser 102 is energized at a first time t 1 , then the mirror 118 will be at a first position, as represented by the solid lines, and the beam of light 108 will reflect off of the mirror 118 as the beam of light 120 .
  • the mirror 118 will be at a second position, as represented by the dashed lines, and the beam of light 110 will reflect off of the mirror 118 as the beam of light 122 .
  • the mirror 118 will be in a position to accurately reflect the beam of light 122 along substantially the same path as the beam of light 120 .
  • the beams of light 120 , 122 are substantially collinear, but are slightly displaced in time. That is, the beams of light 120 , 122 will now both be projected onto substantially the same point on the display surface 138 , but at slightly different times. However, owing to the persistence of the human eye, the variation in timing is not detectable. That is, in the case of the three laser system described in FIG. 1 , each of the lasers 102 , 104 , 106 will controllably deliver laser light of a unique color and intensity to substantially the same point on the viewing surface 132 within a relatively short window of time.
  • the human eye will not detect the three separate colors, bur rather will perceive a blending of the three light beams such that a consistent and desired hue appears at that point on the viewing surface. Those skilled in the art will appreciate that this process may be repeated numerous times along the path 140 to recreate a picture on the viewing surface 132 .
  • a photodetector 144 is arranged to receive laser light reflected from the viewing surface 138 .
  • the photodetector 144 may take any of a variety of forms, including a single photosensitive element or a plurality of photosensitive elements arranged in a grid. In some embodiments, it may be useful to include a mechanical/optical system 146 to focus the reflected laser light onto the photodetector 144 .
  • the photodetector 144 is coupled to the controller 142 via a line 148 . Signals indicative of the magnitude of the reflected laser light detected by the photodetector 144 may be communicated to the controller 142 over the line 148 . In some instances, such as when the photodetector 144 is composed of a grid or an array of photosensors or photosensitive elements, it may be useful to also convey information regarding the location of the reflected laser light. As discussed in more detail in conjunction with FIG. 4 , the controller 142 may use the information regarding the magnitude of the reflected laser light to generally determine if conditions within the transmission path of the lasers have changed, such as by being interrupted by a person or object. The controller 142 may use information regarding such an event to determine if the viewing surface has been touched. That is, the viewing screen may be rendered “touch sensitive,” and thus, may provide a form of feedback from an operator.
  • the controller 142 may display a pushbutton or other accessible icon on the viewing surface, and if the controller 142 detects that the portion of the viewing surface displaying the pushbutton has been touched, then the controller 142 may take a responsive action. For example, the controller 142 may display an icon labeled “headlights,” and if the controller 142 detects that a user has touched the “headlights” icon, the controller may turn on the headlights. Similarly, numerous other functions may implemented by way of appropriately configured or labeled icons displayed on the viewing surface.
  • the resolution is limited by the pulsing frequency. That is, higher pulsing frequency translates to higher resolution. Under different operating conditions, it may be useful to alter the pulsing frequency. For example, it may be useful to have a higher resolution when the display is farther away (e.g., bigger display, see FIG. 4 ). Changing the “Y” frequency can change the “Y” resolution. Generally, the resolution may be increased by reducing “Y” frequency. For example, by slowing the frequency from 70 to 50 Hz, more horizontal lines will be scanned by the fast mirror over the course of traversing the 2-dimensional image.
  • a 2-color display can be composed of a red laser, together with a blue/green laser (488 nM for example). In that case, the video signals for the blue and green colors will both activate the blue/green laser.
  • Good color combination, at lower cost, can be achieved by a 2-laser configuration, which can be useful for low end applications like games, cell phones and PDA's.
  • a higher speckle noise that may be produced from the lower number of lasers (2 instead of 3) can actually be an advantage in some cases like video games, where the speckle may be considered “cool” by some users, such as teens.
  • red and blue lasers are used while using a green screen (or a green phosphor screen) or adding green LED illumination (same for red or blue).
  • red and green lasers while disregarding the blue signal.
  • a red laser with a longer wavelength than a normal red (650-630 nM) the combination of the longer wavelength red with green provides a wide variety of colors that can be acceptable in at least some applications.
  • the green laser does not have enough power, it may be useful to employ a plurality of lasers of the same color.
  • 4 lasers may be employed (a red laser, a blue laser, and 2 green lasers with orthogonal polarization), as shown in FIG. 5 .
  • Such an arrangement may be used to compensate for lower power while reducing speckle at the same time.
  • FIG. 5 also illustrates an alternative embodiment of the instant invention in which different colors lasers are combined into one substantially collinear beam using wavelength dependant filters (e.g., a filter that transmits blue and red but reflects green).
  • wavelength dependant filters e.g., a filter that transmits blue and red but reflects green.
  • the different wavelength green lasers can be separated with a wavelength dependent filter but both may still be considered to be green.
  • Another possibility of using a 4th laser is to increase resolution by using both green lasers for increased resolution (each laser responsible for different pixels).
  • the 4th laser is to use an infrared (IR) laser that will not change the display but will allow special signal to be picked up by an infrared sensor.
  • IR infrared
  • each screen may be configured to reflect a portion of the laser light while passing a portion of the laser light (e.g., 1 st screen—70% transmission, 2 nd screen—50% transmission, and 3 screen—0% transmission).
  • 1 st screen—70% transmission, 2 nd screen—50% transmission, and 3 screen—0% transmission Such an arrangement will provide 3 similar displays with increased sizes and similar brightness, as shown in FIG. 6 .
  • an identical but reverse image appears on both sides of a paper or other mat material screen.
  • Such an arrangement may be useful for two-player video games or a digital camera that can display the picture both for the person taking the picture and the subject.
  • Motion and/or position sensors may be used to change the display based on spectator position.
  • the sensors can be external (such as passive infrared motion sensors) or part of the LPD using an additional IR laser with IR sensor.
  • a rectangular image projected on the inside of the cylinder can be rotated around the cylinder.
  • a high-speed mirror greater than 40 Hz
  • a continuous image can be displayed on the entire cylinder surface.
  • This arrangement is particularly useful in advertising displays, where the image changes as the user is detected to move around the display. For example, an image of a salesperson can move as the user moves around the display.
  • a laser pointer may be used for icon activation.
  • the laser pointer may advantageously have two modes of operation. In a first mode of operation, the laser pointer may use a continuous wave (CW) mode for aiming the pointer at the desired icon. Thereafter, the laser pointer, by activation of a push button for example, may enter a pulse mode to activate the icon.
  • An independent optical sensor a camera or other sensors
  • FIG. 9 An illustrative example is shown in FIG. 9 .
  • a standard projection display 900 an LCD projector or DLP projector
  • a separate ccd camera 902 views the image and is capable of sensing the location of the laser pointer beam 904 .
  • the ccd camera 902 connects to a controller 406 , such as a personal computer, and controls the program in a manner similar to a computer mouse.
  • the CCD camera can be filtered so that it only senses the specific laserpointer wavelength.
  • the projection display “X” mirror has to be small because it oscillates at a relatively high frequency (20 KHz).
  • the “Y” mirror oscillates at a relatively slow rate, and thus, can be substantially larger.
  • the larger size of the “Y” mirror allows the addition of a collection mirror and a photodiode to create a “semi retro” configuration.
  • icons may be placed on the side of the screen and a projection display detector will recognize when an external laser is projected onto the icon. If the “X” and “Y” mirrors are interchanged, the icons may be placed on the bottom part of the screen. Those icons can be used for control in a video game or menu in a television set.
  • the frequency of the pointer laser can be matched to filters on the photodiode so that only the pointing laser (and not the display lasers) will be detected.
  • An alternative method of separating the pointing laser from the display lasers would be to modulate the pointing laser at a known pattern. The processing would ignore any signal other than this known pattern.
  • the laser can be pulsed at a predetermined frequency, thereby alerting the control circuitry.
  • the laser pointer can have multiple buttons.
  • a first button can be used to energize the laser.
  • a second button can be used to click.
  • a single button with two position sensing can be used.
  • an LPD with stronger laser power (1-5 W) can be used to project very large images (such as HDTV) on a wall or surface. Accordingly, the LPD can be used instead of conventional large screen TVs (Plasma, LCD, CRT, etc.)
  • the problem exists that the output from an LPD is limited by the regulatory bodies to relatively low levels.
  • One way of overcoming the regulatory limitation is to provide an interlock system in such a way that projection stops within a few pixels once it is determined that the lasers did not hit the screen.
  • the semi-retro configuration of FIG. 10 can be used to sense whether the projected image is hitting the screen by sensing the relative strength of the received signal. If the signal is out of set boundry conditions, the lasers are turned off.
  • an LPD may be sufficient for personal/portable DVD, video game consoles, cell phone displays and portable computers. Bigger display like Laptop computers can be achieved with medium power lasers (0.05-0.1 W)
  • FIG. 12 shows an LPD housed internally within a large screen TV.
  • the power output of the LPD is not limited by the regulatory bodies since it is impossible for a user to see the direct laser beam.
  • the units is kept very thin by folding the projected image and correcting the large optical deformation electronically.
  • lasers have a defined linear polarization.
  • 2 lasers with orthogonal polarization may be used to project different images that can be seen separately by a viewer's left and right eyes using polarization filters (3-D polarized eye glasses), as shown in FIG. 13A .
  • 3-D polarized eye glasses 3-D polarized eye glasses
  • 6 lasers are needed—two red orthogonally polarized, two blue orthogonally polarized and two green orthogonally polarized.
  • Each of the sets of colors that are polarized similarly projects a separate image onto the screen.
  • a blue-green laser replaces the two separate blue and green lasers
  • only 4 lasers are needed for a full 3-D color display.
  • only one additional laser is needed to obtain a 3-D effect only in one color.
  • orthogonal polarization may be obtained with only 3 lasers by using a crystal that can rotate polarization.
  • the crystal is placed in the optical path of the lasers and may be periodically activated to alter the polarization.
  • the polarization can be rotated between frames of two projected images. This polarization change does not have to be fast since the eye has integration capacity.
  • Polarization can be changed with every frame or every “X” scan lines, or alternatively the polarization may be altered with each scan of the “X” mirror, effectively producing two interlaced images, each having opposite polarization.
  • altering the polarization can also be used to produce a double sided screen, wherein each side displays a different image.
  • a polarized screen is used so that one of the polarized images displayed on one side while the other polarized image passes through the screen and is displayed on the other side of the same screen.
  • the screen can be made of glass with tiny wires at the right orientation to allow the second polarized image to pass through.
  • a 3D screen can be achieved without requiring the polarized glasses of FIG. 13A .
  • two different polarized images are projected towards a screen.
  • a polarization selective screen is utilized.
  • the screen has different angular diffraction for different polarization, thereby directing the two images in two different angles so that each eye sees a slightly different image which will enhance 3-D effects.
  • a product can be designed having removeable screens, wherein the user selects the type of screen to achieve the desired effect.
  • the screen type can be manually or automatically detected to change the content of the images projected.
  • terms such as “processing” or “computing” or “calculating” or “determining” or “displaying” or the like refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical, electronic quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system's memories or registers or other such information storage, transmission or display devices.
  • control units may include a microprocessor, a microcontroller, a digital signal processor, a processor card (including one or more microprocessors or controllers), or other control or computing devices.
  • the storage devices referred to in this discussion may include one or more machine-readable storage media for storing data and instructions.
  • the storage media may include different forms of memory including semiconductor memory devices such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs) and flash memories; magnetic disks such as fixed, floppy, removable disks; other magnetic media including tape; and optical media such as compact disks (CDs) or digital video disks (DVDs).
  • DRAMs or SRAMs dynamic or static random access memories
  • EPROMs erasable and programmable read-only memories
  • EEPROMs electrically erasable and programmable read-only memories
  • flash memories such as fixed, floppy, removable disks
  • CDs compact disks
  • DVDs digital video disks

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Lasers (AREA)
US10/837,022 2003-12-31 2004-04-30 Color laser projection display Abandoned US20050140930A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US10/837,022 US20050140930A1 (en) 2003-12-31 2004-04-30 Color laser projection display
EP04815050A EP1700488A1 (en) 2003-12-31 2004-12-21 A color laser projection display
JP2006547262A JP2007525699A (ja) 2003-12-31 2004-12-21 カラーレーザの投射ディスプレイ
PCT/US2004/042929 WO2005067313A1 (en) 2003-12-31 2004-12-21 A color laser projection display
US11/582,914 US7445339B2 (en) 2003-12-31 2006-10-18 Color laser projection display

Applications Claiming Priority (2)

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US53393003P 2003-12-31 2003-12-31
US10/837,022 US20050140930A1 (en) 2003-12-31 2004-04-30 Color laser projection display

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US11/582,914 Active US7445339B2 (en) 2003-12-31 2006-10-18 Color laser projection display

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WO2005067313A1 (en) 2005-07-21

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