WO2014194491A1 - Circuit de stabilisation de projecteur d'images en trois dimensions - Google Patents

Circuit de stabilisation de projecteur d'images en trois dimensions Download PDF

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Publication number
WO2014194491A1
WO2014194491A1 PCT/CN2013/076777 CN2013076777W WO2014194491A1 WO 2014194491 A1 WO2014194491 A1 WO 2014194491A1 CN 2013076777 W CN2013076777 W CN 2013076777W WO 2014194491 A1 WO2014194491 A1 WO 2014194491A1
Authority
WO
WIPO (PCT)
Prior art keywords
input device
signal
pll
phase
rotational speed
Prior art date
Application number
PCT/CN2013/076777
Other languages
English (en)
Inventor
Casimer M. Decusatis
Original Assignee
International Business Machines Corporation
Ibm (China) Co., Limited
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 International Business Machines Corporation, Ibm (China) Co., Limited filed Critical International Business Machines Corporation
Priority to PCT/CN2013/076777 priority Critical patent/WO2014194491A1/fr
Publication of WO2014194491A1 publication Critical patent/WO2014194491A1/fr

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Classifications

    • 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
    • H04N13/398—Synchronisation thereof; Control thereof
    • 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
    • H04N13/363—Image reproducers using image projection screens
    • 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
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/31—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers
    • H04N13/315—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers the parallax barriers being time-variant
    • 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
    • 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]
    • H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing

Definitions

  • the present invention relates to a stereoscopic three dimensional image projector, and more specifically, to a feedback circuit for a three dimensional projector.
  • 3D images utilize the human physical trait of binocular vision. Human eyes are spaced about 2 inches (5 centimeters) apart; therefore each eye sees the world from a slightly different perspective. The brain receives both images and has a binocular vision function that correlates the difference between what each eye sees to determine distance. The determination of the distance provides the 3D effect that a person sees.
  • a binocular image on a two dimensional surface such as a movie or television screen
  • the user typically wears glasses.
  • the glasses alter the way that the user views the images to create the simulated 3D effect.
  • passive glasses typically there are two types of glasses, passive glasses and active glasses.
  • the type of glasses used will depend on the type of image projection system being used.
  • Passive glasses rely upon an optical effect created by using different lenses for each eye.
  • the projection system emits a sequential series of images where subsequent images are slightly offset.
  • the images are arranged such that the user sees the first image through a first lens of the glasses (e.g. the right eye) and the second image is seen with the other lens (e.g. the left eye). Since the images are projected quickly, the user does not notice the multiple images, but rather sees a three dimensional effect.
  • the glasses wirelessly communicate with the projector to synchronize the operation of the glasses with the images being displayed.
  • the lenses are typically liquid crystal displays (LCDs) that can switch between transmitting light and blocking light. In this way, the glasses may rapidly switch the left and right lenses between clear and opaque. While the glasses are switching, the television is projecting a series of sequential images. When this switching is synchronized between the television and the glasses, the user experiences a three dimensional effect.
  • LCDs liquid crystal displays
  • An embodiment is a method that includes providing a first input device, a second input device, and a sensor for determining the rotational speed of the second input device.
  • the method also includes providing a control device for controlling the rotational speed of the second input device.
  • the method further includes providing a phased locked loop (PLL) and creating a phase reference signal based on the signal rate of the first input device.
  • a phase signal is created based on the rotational speed of the second input device as it is measured by the sensor.
  • the PLL compares the phase reference signal and the phase feedback signal to determine whether the first input device and the second input device are synchronized.
  • a signal is sent to the control device for the second input device to change the rotational speed of the second input device in response to determining that the first input device and the second input device are not synchronized.
  • Another embodiment is a projector system for a portable electronic device having a first input device, a second input device, a control device, a sensor and a PLL.
  • the projector system is configured to perform a method that includes creating a phase reference signal based on the signal rate of the first input device.
  • a phase feedback signal is created based on the rotational speed of the second device as it is measured by the sensor.
  • the phase reference signal and the phase feedback signal are compared by the PLL to determine whether the first input device and the second input device are synchronized. If the first input device and second input device are not synchronized, the PLL sends a signal to the control device of the second input device, and the control device changes the rotational speed of the second input device in response to receiving the signal.
  • a further embodiment is a system that includes a control device that communicates with a second input device.
  • the control device is configured to control the rotational speed of the second input device.
  • the system also includes a sensor that communicates with the second input device and is configured for determining the rotational speed of the second input device and outputting a phase feedback signal based on the determined speed of the second input device.
  • the system further includes a PLL that is configured to receive and compare a phase reference signal from a first input device and the phase feedback signal to determine whether the first input device and the second input device are synchronized. If the PLL determines that the first input device and the second input device are not synchronized, it sends a signal to the control device to change the rotational speed of the second input device.
  • FIG. 1 is a schematic view of an exemplary three dimensional (3D) image projector in accordance with an embodiment of the invention
  • FIG. 2 is a flow chart for a method of operating a feedback circuit in a 3D image projector in accordance with an embodiment of the invention
  • FIG. 3 is a schematic view of another exemplary 3D image projector in accordance with an embodiment of the invention.
  • FIG. 4 is a top schematic view of the 3D image projector of FIG. 3.
  • FIG. 5 is a flow chart for a method of operating a feedback circuit in a 3D image projector in accordance with another embodiment of the invention.
  • An embodiment of the present invention includes an electronic feedback circuit for synchronizing polarization modulation elements with flashing light sources or data modulation devices in stereoscopic three dimensional (3D) pico projectors.
  • a 3D stereo input signal (such as from an electronic stereo jack or similar system) is derived from the frame rate of a digital image system and used as a phase reference to synchronize the input signal with a polarization modulator.
  • the same approach is used to synchronize various elements within a pico projector, including elements such as the frame rate of the signal driving the image system (a liquid crystal on silicon display or "LCoS display”, a digital mirror device or “DMD”, or a similar device), a rotating polarization modulator, a flashing light emitting diode (LED) or laser light source, or multiple light sources with a common dichroic combiner.
  • elements such as the frame rate of the signal driving the image system (a liquid crystal on silicon display or "LCoS display", a digital mirror device or “DMD”, or a similar device), a rotating polarization modulator, a flashing light emitting diode (LED) or laser light source, or multiple light sources with a common dichroic combiner.
  • One of the two devices to be synchronized provides the stereo jack input, and the other provides a signal from a modulation sensor (for example, a tachometer measurement of the rotating polarization element, or a fraction of the modulation signal driving the LED or LCoS device).
  • a modulation sensor input is delayed by some amount due to variations in the circuitry layout for different pico projector designs. To compensate for this delay, embodiments incorporate a variable quiescence delay that cancels out the delay in order to achieve the necessary
  • the feedback from the modulation sensor is amplified and conditioned prior to driving a phase locked loop (PLL) which also uses the phase reference signal (divided by 2) to account for the fact that the signal must be modulated at twice the speed of the polarization element.
  • PLL phase locked loop
  • the projector 20 includes a first light source 22 and an opposing second light source 24.
  • the light sources 22, 24 are arranged to direct light towards each other.
  • Each light source includes three
  • the LED's 30, 32, 34 are arranged to form three sides of a square and direct light toward the center of light source 22, 24. Each LED 30, 32, 34 may be coupled to direct light into a light collection optic 36.
  • the light collection optic 36 directs the light from the LED's 30, 32, 34 into a dichroic color combiner 38.
  • the dichroic color combiner 38 combines light from the LED's to create a desired light color.
  • the light from the first light source 22 exits via an open side 40 and passes through a fly's eye lens 42 and a pre-polarizer lens 44.
  • the light exits the pre-polarization lens 44, in the direction of arrow 26, and passes through a focusing lens 52 that focuses the light into a polarizing beam splitter (PBS) 54.
  • PBS polarizing beam splitter
  • the second light source 24 operates in a similar manner such that the light emitted from the LEDs exits an open side 46 and passes through a fly's eye lens 48 and a pre-polarizer lens 50.
  • a PBS 54 is an optical component that splits incident light rays into a first
  • the PBS 54 is a device arranged to rotate about an axis 58.
  • the PBS 54 has a surface 60 that alternately reflects the light from the light sources 22, 24 as it rotates onto an imaging device 62.
  • the imaging device 62 includes a LCoS display. The light reflects off of the surface 64 of the imaging device 62 with a polarization that then substantially transmits through the PBS 54, through the projection lens assembly 66 and out of the projector 20.
  • the projector 20 shown in FIG. 1 also includes a feedback circuit 100 that is used to synchronize various components within the projector 20, particularly to stabilize polarization modulation.
  • the feedback circuit 100 is electrically coupled to communicate with the first light source 22, the second light source 24, the PBS 54 and the imaging device 62.
  • the feedback circuit 100 receives modulation signals from the PBS 54 and from the light sources 22, 24 or the imaging device 62, and then outputs a modulation signal to the PBS 54 to keep the PBS 54 synchronized with the light sources 22, 24 or with the imaging device 62 during operation.
  • the feedback circuit 100 ensures that the PBS 54 is rotating at a speed such that the PBS 54 is in the correct position when either an image is displayed on the surface 64 of the imaging device 62 and/or a light is emitted by one of the light sources 22, 24.
  • the frame rate of the imaging device 62 of FIG. 1 is being synchronized with the rotation speed of the PBS 54 of FIG. 1.
  • the first input device being synchronized is the imaging device 62.
  • a phase reference signal 73 is derived from the speed or frame rate of the imaging device 62.
  • the phase reference signal 73 is input to a phase locked loop (PLL) 88.
  • PLL phase locked loop
  • the whole phase reference signal 73 is input to the PLL 88.
  • a fraction of the phase reference signal is input to the PLL 88.
  • the second input device shown in FIG. 2 is PBS 54 of FIG. 1. While the frame rate of the imaging device 62 is input into the feedback circuit 100, input from the rotating PBS 54, is simultaneously gathered via a sensor 80.
  • the sensor 80 for the PBS 54 is a tachometer that measures the rotational speed of the PBS 54. In alternate embodiments, the sensor 80 detects the modulation signal driving the imaging device 62.
  • a phase feedback signal 81 that indicates the rotational speed of the PBS 54 is output from the sensor 80.
  • the phase feedback signal 81 output from the sensor 80 is adjustable via a programmable quiescence delay device 82 which is set based, for example, on how fast the PBS 54 is spinning.
  • the quiescence delay device 82 is an optional element of the feedback circuit 100 which may be required to compensate for a delay that is introduced due to the design or circuitry of the projector 20
  • a PBS modulator driver 90 for the PBS 54 sends the quiescent delay device 82 a quiescence reference signal 84 that is based on the current rotational speed of the PBS 54 such that any delay in a phase feedback signal 81 may be eliminated to achieve synchronization accuracy.
  • an optional signal conditioner or amplifier 86 may be applied to the phase feedback signal 81 that is output from the quiescence delay device 82 prior to the phase feedback signal 81 being directed to the PLL 88.
  • the PLL 88 compares the phase reference signal 73 and the phase feedback signal 81 to determine whether the rotation of the PBS 54, is synchronized with the frame rate of the imaging device 62. Based on the results of the comparison, the PLL 88 outputs a signal 92 to the PBS modulator driver 90 causing the PBS modulator driver 90 to either increase or decrease the rotational speed of the PBS 54. This synchronization of the PBS 54 with the imaging device 62 stabilizes the polarization modulation occurring within the projector 20.
  • the first input device is an LED, such as LED 30 within light source 22 of FIG. 1. In this embodiment the frame rate of the LED 30 is being synchronized with the rotation speed of the PBS 54.
  • phase reference signal 73 it may be necessary, depending on the projector 20, to adjust the phase reference signal 73 before it is input to the PLL 88.
  • the projector has two light sources, such as light sources 22 and 24 as shown in the projector of FIG.l
  • modification of the phase reference signal 73 is not required because each light source only emits light when the rotating PBS 54 is in a given position.
  • the projector has only a single light source, however, the light source will emit light twice for every rotation of the PBS 54.
  • the phase reference signal 73 must therefore be adjusted to correlate the emission of a light from an LED with the timing that a PBS 54 is in a given position.
  • the phase reference signal 73 is then directed into the PLL 88.
  • the difference may be compensated for with a delay in the sensor 80.
  • the projector 120 includes a light generator 121 having three individual laser light generators 123, 124, 125.
  • each laser light generator 123, 124, 125 includes a pair of monochromatic laser diodes, with each of the pair of monochromatic laser diodes having orthogonal polarizations relative to each other.
  • the generator 123 includes a pair of red laser diodes 130, 131, the generator 124 includes a pair of green laser diodes 132, 133 and the third generator 125 a pair of blue laser diodes 134, 135.
  • the generators 123, 124, 125 are arranged in series. As a result, the diodes 130, 132, 134 are aligned in series to form a first light source 122 and the diodes 131, 133, 135 are aligned to form a second light source 127.
  • Each of the diodes 130, 132, 134 may include an integrated collimator 129, 137, 139 that directs light toward one of adjacent dichroic mirrors 136, 138, 140.
  • a dichroic mirror or filter uses alternating layers of optical coatings with different refractive indexes built up upon a glass substrate. The interfaces between the layers of different refractive index produce phased reflections, selectively reinforcing certain wavelengths of light and interfering with other
  • dichroic filters Since unwanted wavelengths are reflected rather than absorbed, dichroic filters do not absorb this unwanted energy during operation which provides advantages in reducing heat when compared with an equivalent light filtering device since the filter will absorb energy all from all wavelengths except the desired color.
  • the mirrors 136, 138, 140 are each arranged to reflect the color of their respective laser diode 130, 132, 134. Further, the mirrors 136, 138, 140 are disposed on an angle to reflect and blend the individual colors to form white light.
  • the first laser diode 130 emits a blue colored light 146 that reflects off of the dichroic mirror 136 towards the dichroic mirror 138.
  • the second laser diode 132 emits a green colored light 148 that reflects off of the dichroic mirror 138 towards the dichroic mirror 140.
  • the light 146 from the first laser diode 130 mixes with the light 148 from the second laser diode 132.
  • the dichroic mirror 140 reflects the light 150 and allows mixing with the light from diodes 130, 132 to form white light.
  • the dichroic mirrors 136, 138, 140 are angled or shaped to direct the white light in a direction towards a common optic axis 155.
  • Each of the light sources 122, 127 are configured with a predetermined polarization. In one embodiment, the polarization of light source 142 is orthogonal to the polarization of light source 144. Further, the light sources 142, 144 are configured to alternately and sequentially emit light onto the common optic axis 155.
  • the light from the first light source 122 exits and passes through a fly's eye lens 154.
  • the fly's eye lens 154 is made up of an array of lenslets that have the effect of breaking the transmitted light into many components and projecting them evenly over the field of view. The result is even, bright illumination without any reduction in light intensity at the periphery of the projected light.
  • the light may pass through an optional condenser lens 156 that concentrates the light.
  • the light passes through a focusing lens 158 that focuses the light toward a mirror 160.
  • the mirror 160 reflects and spreads the light onto an imaging device 162.
  • the light reflects off of the imaging device 162 with a polarization that then substantially transmits through a projection lens assembly 166 and out of the projector 120. This process is repeated in a sequential manner for the second light source.
  • the imaging device 162 is a DMD.
  • a DMD is an optical semiconductor having several hundred thousand microscopic mirrors arranged in an array. The array of microscopic mirrors forms an image surface or plane that may then be projected. These surface mirrors correspond to pixels in the image being displayed. The mirrors are individually rotated to either reflect the light into the projection lens assembly 166 or reflect the light away (making it dark). Grey scale colors are produced by toggling the microscopic mirrors very quickly. The amount of time the microscopic mirrors are reflecting into projection lens assembly 166 will determine the shade of grey.
  • the imaging device 162 is arranged with a first axis 170 that extends is substantially perpendicular from the center of the image surface of the DMD image device 162.
  • the projection lens assembly 166 is arranged on a second axis 168.
  • the first axis 170 and the second axis 168 are offset by a distance D such that mirror 160 is arranged to reflect the light such that light 172 being reflected off of the imaging device 162 is at an angle that causes the light to intercept the projection lens assembly 166.
  • the projector 120 includes an optional back reflection filter to reduce speckle.
  • the projector 120 also includes a feedback circuit 174.
  • the feedback circuit 174 is electrically coupled to communicate with the first light source 122, the second light source 127 and the DMD imaging device 162.
  • the feedback circuit 174 receives a modulation signal from the light sources 122, 127 and from the DMD imaging device 162, and provides a modulation signal to the DMD imaging device 162.
  • the modulation signals keep the light sources 122, 127 and the DMD imaging device 162 synchronized during operation. In other words, the feedback circuit 174 ensures that the desired light source 122, 127 is emitting light that corresponds to the image projected through the projection lens assembly 166.
  • the modulation rate (i.e., the on/off flashing rate) of the light sources 122, 127 of FIG. 3 and FIG. 4 are being synchronized with the rotation speed of the mirrors in the DMD imaging device 162.
  • the first input device being synchronized includes light sources 122, 127 and the second input device is the DMD imaging device 162.
  • a phase reference signal 173 is derived from the modulation rate of the light sources 122, 127, and the phase reference signal 173 is input to a PLL 188.
  • the modulation rate of the light sources 122, 127 is input into the feedback circuit 174, input from the DMD imaging device 162, is simultaneously gathered via a sensor 180.
  • the sensor 180 measures the rotational speed of the mirrors in the DMD imaging device 162.
  • the sensor 180 detects the modulation signal driving the rotational speed of the mirrors in the DMD imaging device 162.
  • a phase feedback signal 181 that indicates the rotational speed of the mirror in the DMD imaging device 162 is output from the sensor 180.
  • the phase feedback signal 181 output from the sensor 180 is adjustable via a programmable quiescence delay device 182 which is set based, for example, on how fast the mirrors in the DMD imaging device 162 are spinning.
  • the quiescence delay device 182 is an optional element of the feedback circuit 174 which may be required to compensate for a delay that is introduced due to the design or circuitry of the projector 120.
  • a DMD driver 190 that controls the rotational speed of the mirrors in the DMD imaging device 162 sends the quiescent delay device 182 a quiescence reference signal 184 that is based on the current rotational speed of the mirrors in the DMD imaging device 162 such that any delay in the phase feedback signal 181 may be eliminated to achieve synchronization accuracy.
  • an optional signal conditioner or amplifier 186 may be applied to the phase feedback signal 181 that is output from the quiescence delay device 182 prior to the phase feedback signal 181 being directed to the PLL 188.
  • the PLL 188 compares the phase reference signal 173 and the phase feedback signal 181 to determine whether the rotation of the mirrors in the DMD imaging device 162 are synchronized with the modulation rate of the light sources 122, 127. Based on the results of the comparison, the PLL 188 outputs a signal 192 to the DMD driver 190 causing the DMD driver 190 to either increase or decrease the rotational speed of the mirrors in the DMD imaging device 162.
  • Embodiments of the present invention provide for a feedback circuit compatible with a 3D projector in a number of arrangements.
  • the description of the exemplary projector systems is meant to aid in the understanding of the application of the feedback circuit to a projector system, and not to limit the invention.
  • the present invention provides the advantage of having synchronized components within a projector for ensuring the accuracy of a projected 3D image.
  • Embodiments of the present invention provide advantages in emitting a 3D image usable with passive or active glasses.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne un circuit de stabilisation de projecteur d'images à trois dimensions faisant appel à un premier dispositif d'entrée, un second dispositif d'entrée, et un capteur afin de déterminer la vitesse de rotation du second dispositif d'entrée. L'invention concerne également un dispositif de commande qui commande la vitesse de rotation du second dispositif d'entrée et une boucle à verrouillage de phase (PLL). Un signal de phase est créé sur la base de la vitesse de rotation du second dispositif tel qu'il est mesuré par le capteur. La PLL compare le signal de référence de phase et le signal de la phase rétroactive afin de déterminer si le premier et le second dispositif d'entrée sont synchronisés. Un signal est envoyé au dispositif de commande du second dispositif d'entrée afin de modifier la vitesse de rotation du second dispositif d'entrée en réponse à la détermination que le premier et le second dispositif d'entrée ne sont pas synchronisés.
PCT/CN2013/076777 2013-06-05 2013-06-05 Circuit de stabilisation de projecteur d'images en trois dimensions WO2014194491A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/076777 WO2014194491A1 (fr) 2013-06-05 2013-06-05 Circuit de stabilisation de projecteur d'images en trois dimensions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/076777 WO2014194491A1 (fr) 2013-06-05 2013-06-05 Circuit de stabilisation de projecteur d'images en trois dimensions

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WO2014194491A1 true WO2014194491A1 (fr) 2014-12-11

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1987552A (zh) * 2005-12-21 2007-06-27 国际商业机器公司 使用多个偏振滤光器的流明优化的立体投影仪和方法
US20110273539A1 (en) * 2009-01-29 2011-11-10 Thomson Licensing Single camera for stereoscopic 3-d capture
CN102300108A (zh) * 2010-06-22 2011-12-28 乐金显示有限公司 数据调制方法以及使用该数据调制方法的液晶显示设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1987552A (zh) * 2005-12-21 2007-06-27 国际商业机器公司 使用多个偏振滤光器的流明优化的立体投影仪和方法
US20110273539A1 (en) * 2009-01-29 2011-11-10 Thomson Licensing Single camera for stereoscopic 3-d capture
CN102300108A (zh) * 2010-06-22 2011-12-28 乐金显示有限公司 数据调制方法以及使用该数据调制方法的液晶显示设备

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