Classifications

• • 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
  • G02B27/01—Head-up displays
  • G02B27/017—Head mounted
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
  • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
  • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
  • H04N13/106—Processing image signals
  • H04N13/144—Processing image signals for flicker reduction
• • 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
• • 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
• • 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
  • G02B27/01—Head-up displays
  • G02B27/0101—Head-up displays characterised by optical features
  • G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
  • G02B2027/0134—Head-up displays characterised by optical features comprising binocular systems of stereoscopic type
• • 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
  • G02B27/01—Head-up displays
  • G02B27/0101—Head-up displays characterised by optical features
  • G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2213/00—Details of stereoscopic systems
  • H04N2213/002—Eyestrain reduction by processing stereoscopic signals or controlling stereoscopic devices

Definitions

• the present invention relates to video displays, and more particularly to viewing stereo video and graphics images utilizing stereo shutter glasses.
• stereo viewing involves the display of separate content for the right and left human eye. Specifically, such stereo viewing requires the presentation of a separate image to the left and right human eye.
• stereo viewing namely time sequential stereo
• left and right images are presented in an alternating manner.
• alternating shutter glasses are also typically used which make the left image visible to the left eye and the right image to the right eye at the appropriate time.
• time sequential stereo viewing has worked well on CRTs and related displays [e.g. high frame rate (DLP) projectors, etc.].
• DLP high frame rate
• time sequential stereo viewing has not shown promise with liquid crystal displays (LCDs), whether flat-panel or in the form of a projector, due to several issues.
• LCDs liquid crystal displays
• a slow response time of pixels in LCD environments causes 'ghosting' of the left image in the right view, and visa versa.
• the nature of the LCD update process unfortunately results in only short periods of time when the right image and left image may be present in their entirety, as will now be described in more detail.
• Figure IA illustrates hypothetical shortcomings that would exist if stereo viewing were attempted utilizing an LCD.
• the LCD would receive pixels in raster scan order (i.e. left to right, line by line from top to bottom, etc.) over a cable 10, such as a digital video interface (DVI) or video graphics array (VGA) cable.
• DVI digital video interface
• VGA video graphics array
• LCD pixels have individual capacitive storage elements that cause each pixel to retain its color and intensity until it is updated by LCD driver-related electronics, which addresses pixels in raster order.
• the actual image emitted from the LCD screen includes the 'not yet overwritten' (e.g. red) part of first left image Ll at the bottom, and the newly written (e.g. green) part of the first right image Rl.
• the display includes only the first right image Rl.
• the first right image Rl has been partially overwritten by a second left image L2, in the manner shown. To this end, if the display content at time TI and T3 were shown to the left or right eye, such eye would unfortunately receive content, at least in part, not intended for such eye.
• stereo glasses equipped with right and left eye shutters are often employed to ensure that the proper eye views the appropriate image, during stereo viewing.
• a left eye shutter control 20 switches the left shutter to an open orientation (during which a right shutter is maintained in a closed orientation).
• a right eye shutter control 30 switches the right shutter to an open orientation (at which time the left shutter toggles to and is maintained in a closed orientation).
• each eye unfortunately, receives content, at least in part, not intended for such eye for a sizeable portion of the duration in which the associated shutter is in the open orientation, resulting in unacceptable stereo viewing. There is thus a need for overcoming these and/or other problems associated with the prior art.
• a system, method, and computer program product are provided for controlling stereo glasses shutters.
• a right eye shutter of stereo glasses is controlled to switch between a closed orientation and an open orientation.
• a left eye shutter of the stereo glasses is controlled to also switch between the closed orientation and the open orientation.
• the right eye shutter and the left eye shutter of the stereo glasses may be controlled such that the right eye shutter and the left eye shutter simultaneously remain in the closed orientation for a predetermined amount of time.
• Figure IA illustrates hypothetical shortcomings that would exist if stereo viewing were attempted utilizing a liquid crystal display (LCD).
• LCD liquid crystal display
• Figure IB illustrates an exemplary computer system in which the various architecture and/or functionality of various embodiments may be implemented.
• Figure 2 shows an exemplary timing for enhancing a viewing experience when display content is viewed utilizing stereo glasses, in accordance with one embodiment.
• Figure 3 shows a method for increasing a vertical blanking interval for enhancing a viewing experience when display content is viewed utilizing stereo glasses, in accordance with one embodiment.
• Figure 4 shows a method for increasing a vertical blanking interval for enhancing a viewing experience when display content is viewed utilizing stereo glasses, in accordance with another embodiment.
• Figure 5 shows an exemplary timing for use when display content is viewed utilizing stereo glasses and an LCD or the like, in accordance with yet another embodiment.
• FIG. 1 illustrates an exemplary computer system 100 in which the various architecture and/or functionality of different embodiments may be implemented.
• a computer system 100 is provided including at least one host processor 101 which is connected to a communication bus 102.
• the computer system 100 also includes a main memory 104.
• Control logic (software) and data are stored in the main memory 104 which may take the form of random access memory (RAM).
• RAM random access memory
• the computer system 100 also includes a graphics processor 106 and a display 108 in the form of a liquid crystal display (LCD), digital light processing (DLP) display, liquid crystal on silicon (LCOS) display, plasma display, or other similar display.
• the graphics processor 106 may include a plurality of shader modules, a rasterization module, etc. Each of the foregoing modules may even be situated on a single semiconductor platform to form a graphics processing unit (GPU).
• GPU graphics processing unit
• a single semiconductor platform may refer to a sole unitary semiconductor-based integrated circuit or chip. It should be noted that the term single semiconductor platform may also refer to multi-chip modules with increased connectivity which simulate on-chip operation, and make substantial improvements over utilizing a conventional central processing unit (CPU) and bus implementation. Of course, the various modules may also be situated separately or in various combinations of semiconductor platforms per the desires of the user.
• CPU central processing unit
• the computer system 100 may also include a secondary storage 110.
• the secondary storage 110 includes, for example, a hard disk drive and/or a removable storage drive, representing a floppy disk drive, a magnetic tape drive, a compact disk drive, etc.
• the removable storage drive reads from and/or writes to a removable storage unit in a well known manner.
• Computer programs, or computer control logic algorithms may be stored in the main memory 104 and/or the secondary storage 110. Such computer programs, when executed, enable the computer system 100 to perform various functions. Memory 104, storage 110 and/or any other storage are possible examples of computer-readable media.
• stereo glasses 111 capable of being worn on a face of a user. While the stereo glasses 111 are shown to include two elongated members for supporting the same on the face of the user, it should be noted that other constructions (e.g. member-less design, head strap, helmet, etc.) may be used to provide similar or any other type of support. As further shown, the stereo glasses 111 also include a right eye shutter 114 and a left eye shutter 113.
• Both the right eye shutter 114 and left eye shutter 113 are capable of both an open orientation and a closed orientation.
• the open orientation allows more light therethrough with respect to the closed orientation.
• orientations may be achieved by any desired mechanical, electrical, optical, and/or any other mechanism capable of carrying out the above functionality.
• the stereo glasses 111 may be coupled to a stereo controller 119 via a cable 118 (or without the cable 118 in a wireless environment).
• the stereo controller 119 is, in turn, coupled between the graphics processor 106 and the display 108 for carrying out the functionality to be set forth hereinafter. While the stereo controller 119 is shown to reside between the graphics processor 106 and the display 108, it should be noted that the stereo controller 119 may reside in any location associated with the computer system 100, the stereo glasses 111, and/or even in a separate module, particularly (but not necessarily) in an embodiment where the graphics processor 106 is attached to a separate interface [e.g. universal serial bus (USB) 5 etc.] on the computer system 100.
• USB universal serial bus
• the display 108 may be directly connected to the computer system 100, and the stereo controller 119 may further be directly connected to the computer system 100 via a USB interface. Still yet, the stereo controller 119 may comprise any hardware and/or software capable of the providing the desired functionality.
• the right eye shutter 114 and left eye shutter 113 of the stereo glasses 111 may be controlled such that the right eye shutter
• the stereo controller In addition to and/or instead of the foregoing technique, the stereo controller
• the display 108, and/or any other appropriate hardware/software associated with the computer system 100 may be equipped with functionality for adapting the display 108 in a way that enhances a viewing experience when display content is viewed utilizing the stereo glasses 111.
• a duration of a vertical blanking interval associated with received display content may be increased for enhancing a viewing experience when the display content is viewed utilizing the stereo glasses 111.
• the vertical blanking interval may refer to any time duration between the display of content intended for viewing by aright eye and a left eye.
• such vertical blanking interval may refer to a time duration in which blank lines (and/or other information) are sent across an interface to the display 108.
• the vertical blanking interval may refer to a time when the content is held on the display 108 and no update occurs.
• the vertical blanking interval e.g. by sending more blank lines across the aforementioned interface, etc.
• the content may be displayed longer for allowing the stereo glasses 111 to remain open longer, thus increasing the apparent brightness to the user, in accordance with one optional embodiment.
• the architecture and/or functionality of the various following figures may be implemented in the context of the host processor 101, graphics processor 106, a chipset (i.e. a group of integrated circuits designed to work and sold as a unit for performing related functions, etc.), and/or any other integrated circuit for that matter. Still yet, the architecture and/or functionality of the various following figures may be implemented in the context of a general computer system, a circuit board system, a game console system dedicated for entertainment purposes, an application-specific system, and/or any other desired system.
• Figure 2 shows an exemplary timing 200 for enhancing a viewing experience when display content is viewed utilizing stereo glasses, in accordance with one embodiment. As an option, the present timing 200 may be implemented in the context of the computer system 100 of Figure IB. Of course, however, the timing 200 may be used in any desired environment. Still yet, the above definitions apply during the following description.
• a display receives display content over a communication medium 201, such as a digital video interface (DVI) or video graphics array (VGA) cable, or any other medium capable of communicating the display content, for that matter.
• a communication medium 201 such as a digital video interface (DVI) or video graphics array (VGA) cable, or any other medium capable of communicating the display content, for that matter.
• display content may include pixel-related information, image(s), and/or any other content or component thereof at any stage of processing capable of being displayed.
• a first left image Ll intended for viewing only by a left eye is shown to be sent over the communication medium 201 first. Thereafter, there is a pause in transmission, namely the vertical blanking interval VBI. Next, a first right image Rl intended for only the right eye is then sent, and so forth.
• a right eye shutter and left eye shutter of stereo glasses are controlled independently. In one embodiment, this may be accomplished utilizing a right eye control signal 206 for controlling the right eye shutter and a left control signal 208 for controlling the left eye shutter.
• the left eye shutter of the stereo glasses may be controlled such that the left eye shutter is in an open orientation at least for the duration of a first set of vertical blanking intervals 210, which follow receipt of display content intended for a left eye.
• the right eye shutter of the stereo glasses may be controlled such that the right eye shutter is in the open orientation at least for the duration of a second set of vertical blanking intervals 213, which follow receipt of display content intended for a right eye.
• the first set of vertical blanking intervals 210 alternate with the second set of vertical blanking intervals 213, and they both occur between periods during which right eye content or left eye content is received from a content source.
• the right eye shutter and the left eye shutter of the stereo glasses may be controlled utilizing a plurality of signals (e.g. codes, etc.).
• signals e.g. codes, etc.
• one of such signals may be specifically allocated to cause the right eye shutter and the left eye shutter to simultaneously transition to and remain in the closed orientation.
• separate signals may be used to close only the right eye shutter, the left eye shutter, etc.
• a right eye shutter and left eye shutter of the stereo glasses may be controlled such that the right eye shutter and left eye shutter simultaneously remain in the closed orientation for a predetermined amount of time 209.
• a predetermined amount of time 209 represents a time during which the first left image Ll has been partially overwritten by the first right image Rl .
• the left eye shutter of the stereo glasses may be controlled such that the left eye shutter is in the open orientation only for the duration of the first set of vertical blanking intervals 210 (i.e. when only left eye content is being displayed, etc.).
• the right eye shutter of the stereo glasses may be controlled such that the right eye shutter is in the open orientation only for the duration of the second set of vertical blanking intervals 213 (i.e. when only right eye content is being displayed, etc.).
• such predetermined amount of time 209 represents an entire time frame in which the first left image Ll has been partially overwritten by the first right image Rl, and so on.
• the right eye shutter and the left eye shutter of the stereo glasses may be controlled such that the shutters each remain in the open orientation for an adjustable time period (with the predetermined amount of time 209 being decreased) to permit additional light through each respective shutter. See time period 210, for example.
• the eyes of the user may be subjected to more light, thereby enhancing a perceived brightness of an image.
• the left eye shutter of the stereo glasses may be controlled such that the left eye shutter is in the open orientation for a period that exceeds the duration of the first set of vertical blanking intervals 210.
• the right eye shutter of the stereo glasses may be controlled such that the right eye shutter is in the open orientation for a period that exceeds the duration of the second set of vertical blanking intervals 213.
• one trade off associated with such option involves increasing the duration in which each eye receives content, at least in part, not intended for such eye. Specifically, at least a portion of left eye content may be displayed when the right eye shutter is in the open orientation, and visa-versa.
• the duration of the vertical blanking interval VBI associated with received display content may be increased for enhancing a viewing experience when the display content is viewed utilizing the stereo glasses.
• the time period is increased during which each eye receives content wholly intended for such eye, resulting in enhanced stereo viewing of content on the display.
• the vertical blanking interval VBI may be increased in any desired manner. For example, before a content source sends data to the display, appropriate display timing specifications may be consulted. This may be accomplished using any desired interface [e.g. extended display data channel/extended display identification data (E-DDC/EDID), video electronics standards organization (VESA) interface, etc.] using the communication medium 201.
• E-DDC/EDID extended display data channel/extended display identification data
• VESA video electronics standards organization
• the content source may choose one of many established/standard timings and/or tailored timings to send the content, where such timing allows for vertical blanking interval VBI augmentation.
• timings may further be provided/maintained by the manufacturer of the stereo glasses, graphics processor that drives the images using configuration files, etc. More information regarding various exemplary techniques that may be specifically used to increase the duration of the vertical blanking interval VBI in such manner will be set forth in greater detail during reference to subsequent figures.
• Figure 3 shows a method 300 for increasing a vertical blanking interval for enhancing a viewing experience when display content is viewed utilizing stereo glasses, in accordance with one embodiment.
• the present method 300 may be carried out in the context of the computer system 100 of Figure IB and/or the timing 200 of Figure 2. Of course, however, the method 300 may be implemented in any desired environment. Again, the definitions introduced hereinabove apply during the following description.
• a display e.g. display 108 of Figure 1, etc.
• a native resolution may refer to the resolution at which the display is designed to display content without conversion.
• the native resolution is typically based on an actual number of cells in the display.
• pixels may be transmitted for display purposes using a highest possible pixel clock. See operation 304.
• maximum pixel clock may include that which a standard governing a connection cable supports (e.g. 165 Mpix/s for a single link DVI cable, 330 Mpix/s for a dual link DVI cable, etc.).
• the foregoing highest possible pixel clock may include a pixel clock limit indicated by the display in related EDID information. Such limit may be the same as, or lower than a DVI cable clock limit.
• a horizontal blanking interval associated with the display is decreased, as indicated in operation 306.
• the horizontal blanking interval refers to an interval during which processing of successive lines returns from right to left.
• the horizontal blanking interval may be chosen to be as small as possible.
• An alternate technique for increasing the vertical blanking interval may involve the reduction of a display refresh rate.
• a display designed for a 100 Hz refresh rate with a low vertical blanking interval may be used at 85 Hz with a 19% vertical blanking interval, in one illustrative embodiment.
• the display may be specifically equipped with a plurality of additional timings for increasing the duration of the vertical blanking interval. While the display may be equipped with the additional timings in any one of a variety of ways, it may be accomplished, in one embodiment, by including the same in software stored in memory of the display. In use, such additional timings may each be adapted for either decreasing a horizontal blanking interval associated with the display and/or increasing a rate at which pixels are sent to the display.
• Table 1 illustrates one exemplary timing that may be added in the foregoing manner.
• timing is set forth for illustrative purposes only and should not be construed as limiting in any manner.
• a table may be updated in association with a display while, in a DVI environment, no such change may be necessary.
• a CRT-type display may display a first line of X number of pixels after which a horizontal blanking interval may be used to provide time for the display to retrace to the beginning of the scan line so that another line of X number of pixels may be displayed, and so forth.
• Equation #1 illustrates the interrelationship between the horizontal blanking interval and the vertical blanking interval.
• fpix ( ⁇ ixels_X-direction + HBI) * (pixels_Y-direction + VBI) * f v
• the foregoing timing of Table 1 may provide an alternate 1280x1024 75Hz stereo compatible timing specification that may co-exist with existing VESA 1280x1024 75Hz timing specifications.
• the existing 1280x1024 75Hz VESA timing employs 24.2% of available time for horizontal blanking and 3.9% for vertical blanking, whereas the stereo compatible timing employs close to 27% of available time for vertical blanking and less than 4% for horizontal blanking.
• Figure 4 shows a method 400 for increasing a vertical blanking interval for enhancing a viewing experience when display content is viewed utilizing stereo glasses, in accordance with another embodiment.
• the present method 400 may be carried out in the context of the computer system 100 of Figure IB and/or the timing 200 of Figure 2. Of course, however, the method 400 may be implemented in any desired environment. Yet again, the definitions introduced hereinabove apply during the following description.
• a display e.g. display 108 of Figure 1, etc.
• the display may be set at a lower resolution during use. See operation 402. Still yet, the display may be run at a predetermined speed for extending the vertical blanking interval. Note operation 404.
• An example of such technique is set forth below.
• a display may be provided that is designed for a 1600x1200 resolution, but is used at a lower resolution such as 1024x768. If such display supports the 1600x1200 resolution at 60 Hz (in accordance with the VESA standard), it is likely capable of 162 Mpix/s (in any resolution). Thus, by sending the display 1024*768 pixels with a 162 MHz pixel clock, an entire image (assuming 100 pixel horizontal blanking) may be sent in 5.33 ms (1144*768*6.173e-9). Since images at 60 Hz are received every 16.66 msec, the vertical blanking interval may thus be extended to 11.33 msec (16.66 - 5.33).
• each shutter of a pair of stereo glasses may remain in an open orientation for 11.33 msec out of every 33.33 msec, thereby providing a duty cycle of 34% (out of a theoretical maximum of 50%).
• the foregoing functionality of Figures 3-4 may optionally be provided by utilizing a controller (e.g. stereo controller 119 of Figure 1, etc.) coupled to the display.
• a controller e.g. stereo controller 119 of Figure 1, etc.
• such controller may be employed for tapping signals in a cable feeding the display to retrieve triggering information for the glasses (e.g. stereo glasses 111 of Figure 1, etc.).
• triggering information may be derived from a vertical synchronization in the cable, along with left/right eye shutter identifying information associated with the content (e.g. white line codes, etc.) or software-provided control signals (e.g. DDC signal, etc.).
• the method 300 of Figure 3 and the method 400 of Figure 4 may be provided by interrupting two I2C® interface wires that typically carry EDID standard information.
• the controller takes the form of a microcontroller
• such hardware may read original display EDID information and present modified EDID information to the associated computer system.
• drivers that use the EDID information to compute timing settings need not necessarily be modified.
• FIG 5 shows an exemplary timing 500 for use when display content is viewed utilizing stereo glasses and an LCD or the like, in accordance with yet another embodiment.
• the present timing 500 may be implemented in the context of the computer system 100 of Figure IB and/or the timing 200 of Figure 2. Of course, however, the timing 500 may be used in any desired environment.
• display content sent to a display (e.g. display 108 of Figure 1, etc.) in operation 502 may, in turn, be received and buffered in the manner shown in operation 504.
• buffering may be carried out utilizing buffer memory (e.g. DRAM, etc.) resident in the display or in any other location, for that matter.
• the display content for a particular eye may be sent from the buffer to the display, as further indicated in operation 504.
• the display may paint the particular display content currently being sent from the buffer. Note operation 506. Note that, after the display content for a particular eye has been sent and painted, such display content may be held in the manner shown.
• the left and right eye shutter of a pair of stereo glasses may be opened during the time period when the corresponding display content is being held.
• Note operations 508 and 510 respectively.
• the display content may be transferred rapidly to the display, so that it may be held and displayed to a respective eye for a longer time.
• a stable time of the display content may be increased by buffering the display content in the foregoing manner, while avoiding a need to increase the vertical blanking interval on a display interface cable, etc.
• display content received from a content source may be buffered for a predetermined eye until a full image of display content for such eye is available. While such buffering is taking place, previous display content for the other eye may be displayed.
• the full image of display content for such eye may be transferred from the buffer to the display for the duration of the vertical blanking interval or longer. Further, such transfer may be carried out at a maximum pixel rate that the display is capable of handling internally so that the vertical blanking interval is capable of being maximized. If such interval is too short, additional buffering that can temporarily receive and store the next incoming image may be employed. To this end, a duration in which the eye shutters may be maintained in the open orientation may be extended (and hence maximize screen brightness, etc.).
• a backlight of the display may be activated only when at least one of the shutters is in the open orientation.
• This feature may be applied in the context of flashing or scrolling backlights.
• the backlight may be flashed for 30% of the time (for example), but may also use a light with triple the magnitude, in order to provide normal light output.
• the present feature may be used to avoid wasting light (and associated power) when the shutters are closed, and further avoid excessive heat.

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• 2007
  • 2007-03-29 TW TW096111054A patent/TWI366679B/zh active
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  • 2007-03-29 WO PCT/US2007/007702 patent/WO2007126904A2/en active Application Filing
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