WO2014207457A1 - Système d'affichage par projection - Google Patents

Système d'affichage par projection Download PDF

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Publication number
WO2014207457A1
WO2014207457A1 PCT/GB2014/051935 GB2014051935W WO2014207457A1 WO 2014207457 A1 WO2014207457 A1 WO 2014207457A1 GB 2014051935 W GB2014051935 W GB 2014051935W WO 2014207457 A1 WO2014207457 A1 WO 2014207457A1
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WO
WIPO (PCT)
Prior art keywords
display
display system
diodes
light
reflector
Prior art date
Application number
PCT/GB2014/051935
Other languages
English (en)
Inventor
Samuel James Cox
Arnold Peter Roscoe Harpin
Original Assignee
Prp Optoelectronics 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 Prp Optoelectronics Limited filed Critical Prp Optoelectronics Limited
Publication of WO2014207457A1 publication Critical patent/WO2014207457A1/fr

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Classifications

    • 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
    • G02B26/10—Scanning systems
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
    • 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
    • H04N9/3132—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen using one-dimensional electronic spatial light modulators
    • 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
    • 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
    • G02B27/0172—Head mounted characterised by optical features
    • 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
    • G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
    • 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
    • G03B21/28—Reflectors in projection beam
    • 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]
    • 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
    • G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
    • 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
    • G02B27/0149—Head-up displays characterised by mechanical features
    • G02B2027/0154—Head-up displays characterised by mechanical features with movable elements
    • 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

Definitions

  • This invention relates to a projection display system, eg for use in a micro-display or for use in a head up display or head mounted imaging system.
  • the invention also relates to a head up display and head mounted display incorporating such a system.
  • LEDs light emitting diodes
  • Some of these systems use a 2D array of LED emitters integrated on a single chip.
  • the individual LED emitters in such an array are separated from each other by electrically isolating boundaries.
  • the LED emitters are thus typically separated by a distance similar to the width of each emitter (eg 5-8 microns) and this limits the display resolution achievable with such arrays.
  • Large area LED arrays are also relatively expensive as the production yield falls as the size of the array increases,
  • wavefront correcting micro-mirrors are used to improve the resolution (with one micro-mirror per LED).
  • Such arrangements are however very complex and are difficult to align and assemble (again increasing the cost).
  • single light emitters are used and these are scanned by MEMS micro-mirrors to produce an X-Y matrix for the display.
  • the single light source is usually a laser diode. The use of these raises eye safety issues. They also tend to suffer from laser speckle.
  • the present invention seeks to provide a projection display system which overcomes or reduces such problems and is relatively simple and inexpensive to manufacture.
  • the invention also seeks to provide a projection display system with improved resolution.
  • a projection display system comprising an array of light emitting diodes comprising at least first and second rows of diodes, the diodes in each row being spaced from each other, the diodes in the second row being offset in a direction parallel to the length of the row relative to the diodes in the first row, a collimator for collimating light emitted from the array of light emitting diodes, a reflector mounted for movement about an axis, and movement means for moving said reflector about said axis, the array of light emitting diodes being positioned such that light emitted therefrom is directed through the collimator and towards the reflector and reflected therefrom to form a display comprising one or more lines of pixels, and imaging optics for receiving the light reflected from the reflector, the imaging optics being positioned so that the reflector, or at least said axis thereof, lies at the focal plane of the imaging optics so as to provide a telecentric arrangement.
  • the term 'spacing' as used herein refers to the distance between pixels relative to their size rather than the absolute size of the spacing (which will vary according to the magnification of the image compared to the size of the array of light emitting diodes).
  • * display' as used herein includes an image formed by scanning light over one or more lines, eg in the form of a raster scan, and other arrangements in which light is directed onto an object in one or more lines as if an image was being formed thereon.
  • a head up display comprising a projection display system as detailed above.
  • a helmet mounted display comprising a projection display system as detailed above.
  • Figure 1 is a schematic diagram showing a perspective view showing part of a first embodiment of a display system according to the invention using a single LED array;
  • Figure 2a is a schematic diagram of a square LED emitter array used in Fig 1;
  • Figure 2b is a schematic diagram illustrating an illumination pattern produced by scanning of the square LED emitter array shown in Fig 2a;
  • Figure 2c is a schematic diagram of a square LED emitter array having three rows of LED emitters
  • Figure 3 is a schematic optical diagram showing the main components of a projection display system according to a first aspect of the invention
  • Figure 4 is a schematic diagram similar to Fig 3 but also showing an output lens
  • Figure 5 is a schematic diagram from the output lens to an observation plane
  • Figure 6 is a schematic diagram similar to Fig 4 illustrating a potential problem if the arrangement is not telecentric.
  • Figure 7 is a schematic diagram illustrating a preferred arrangement for enlarging the display provided
  • Figure 1 shows a rectangular LED array 10 comprising first and second linear rows of LED emitters formed in a single monolithic chip. Each LED emitter in the array is individually addressable. Other features of the embodiment shown in Fig 1 are described below with reference to Figs 3 to 7 below.
  • Figure 2a shows a plan view of the LED array 10 with the LED emitters in each row being spaced from each other by a distance Di (between adjacent edges of the LEDs), the diodes in the second row being offset from those in the first row in a direction parallel to the length of the rows,
  • the distance Di corresponds to the width of the diodes and the offset is also by a distance Di so that the LED array comprises a two row chequer board pattern of LEDs (as shown in Figures 1 and 2), The first and second row are spaced from each other by a distance D 2 (Di and D 2 may be substantially the same, as shown in the Figures).
  • light from the LED array 10 is directed towards a rectangular oscillating or rotating reflector 1 1 , such as a micro-electro-mechanical system (MEMS) mirror.
  • MEMS micro-electro-mechanical system
  • Movement means are provided so the reflector 1 1 is arranged to oscillate or rotate about an axis A parallel to the length of the reflector 1 1 and parallel to the length of the LED array 10.
  • Oscillation means in the form of electrostatic or magnetic devices (as commonly used in the art for MEMS scanning mirror devices) may be provided to oscillate the reflector 11, eg by resonant vibration, controlled by an electronic control system (not shown), eg providing a square wave or sinusoidal wave pulsed voltage which to controls the scanning movement of the reflector by maintaining the resonant vibration of the mirror.
  • the motion of the reflector may be controlled by a different periodic oscillating waveform, for example a linear saw tooth voltage waveform.
  • the reflector may be rotated continuously about an axis of a shaft of a miniaturised galvanometric motor (rather than oscillatory rotation in opposite directions as described above).
  • the reflector may be multi-faceted, eg having a hexagonal or octagonal cross-section (perpendicular to the axis of rotation), so a series of reflective surfaces are used to reflect the light as the reflector is rotated about the axis.
  • Figure 1 illustrates a display 12 formed by light reflected from the oscillating reflector 11 after passing through other optics described below.
  • the reflector is arranged to scan through an angle sufficient to scan the light reflected therefrom from the top to the bottom of the image 12 to be formed.
  • light from LED emitter 10a in the first row of the LED array is scanned up and down the band or column 12a of the image formed.
  • each of the LED emitters is operated in pulsed mode by the electronic control system referred to above and the timing of each pulse is arranged so that the LED is on (ie emitting light) as the reflected light therefrom passes though each line (or row) of the image to be formed (the lines extending across the width of the image and thus being perpendicular to the columns shown in Figs 1 and 2).
  • the image to be formed is made up of 500 lines, each LED is switched on 500 times as the reflected light therefrom is scanned from the top to the bottom of the image 12.
  • Pixels of the image are thus, in effect, formed at the intersection of the lines and columns in the arrangement shown in Fig 1, all of the pixels in a given column being illuminated by a single LED emitter of the LED array 10.
  • the timing and/or length of pulses from each LED emitter are controlled to ensure that the LED is on as the reflected light therefrom passes through the respective lines of the image.
  • the arrangement is such that the LED pulse timings compensate for the non linear scanning across visible parts of the image, so that the intensity of the illumination pulses of the LEDs across the scanned display can be substantially uniform.
  • the LED emitters and the oscillation or rotation means are operated so that light from the first row and light from the second row of the LED array 10 is combined in each line of the display 12.
  • the pixels of each line of the display are alternately formed from light from the first and second rows of the LED array 10.
  • this is achieved by operating the LED array in pulsed mode and synchronising the pulsed period to the scan frequency of the oscillation or rotation of the reflector such that light from two rows of the LED array is combined to form a single line of the display with minimal flicker.
  • the inter-pixel separation (relative to the size of the pixels) of the display 12 is a fraction of that (Dj) of the LED emitters in the LED array 10 (and may be zero).
  • the resolution in the direction perpendicular to the lines (ie in the scanning direction) is determined by the illumination pulses of the LEDs, and particularly the rise and fall times of the LEDs as they are turned on and off. LED emitters with rise times of ⁇ 10ns are readily available and this is sufficient to provide a spacing (relative the size of the pixels) between lines of the image less than the spacing (D 2 ) between rows of the LED array 10. It will be appreciated that the absolute size of the spacing between pixels may be larger if the display is magnified relative to the size of the LED array. - -
  • the resolution can be further improved in the scanning direction by using additional grey scale variation, ie controlling the rise and fall times of the output of each LED emitter - the limits to resolution achievable being determined by the rise and fall times of the LED turn-on and turn-off characteristics.
  • the resolution of the display is limited only by the size of the LED emitters themselves. Preferably, these have a width of 10 microns or less.
  • the spacing between LED emitters in the LED array corresponds to the width of the LED emitters, adjacent pixels in the display abut one another along the length of each row of the display.
  • the spacing between lines of the display is determined by the movement of the reflector and the timing of the pulses emitted by the LEDs and, in a preferred arrangement, the spacing is zero so pixels in adjacent rows also abut each other. It will be appreciated that other arrangements are possible; the pixels in each row of the display need not abut each other but their spacing is preferably less than the spacing (Di) of the LEDs in each row of the LED array so as to improve the resolution of the display.
  • Figure 2c shows another form of LED array 13 having three rows of emitters in which the third row is offset by a distance (D 3 ) which is half of the offset distance (Di) between the first and second rows of emitters.
  • D 3 the offset distance
  • This has the advantage of providing a display having a pixel size in the non-scanned direction (ie along the lines of the display) which is half that of the emitter elements themselves.
  • the emitter size does not therefore necessarily determine the pixel size in the non-scanned direction of the display.
  • Other arrangements can be used having a plurality of rows of LED emitters such that the relative pixel size (along the lines of the display) is less than half of the size of the emitters themselves in the non-s
  • the elements of the emitting array may have other shapes, eg they may have a diamond shape, eg so their sides lie at 45 degrees to the length of the row but spaced from each other by a distance (D
  • the spacing D2 between the first and second rows of the diamond shaped emitters may be zero.
  • the LED emitters may be hexagonal in shape.
  • the LEDs may also have other shapes.
  • the MEMS micro-mirror 1 1 in the embodiment of Figure 1 may, for example, comprise a rectangular silicon-based MEMS device which is electrostatically or magnetically actuated.
  • the mirror shape may alternatively be ellipsoidal, or the mirror may have some other shape which is able to reflect light from all the LEDs in the LED array.
  • the MEMs mirror 1 1 is preferably as large as possible so it can reflect light from large linear LED arrays.
  • an array of 384 emitters could be defined by two rows of 192 stepped emitters, each row being approximately 8 mm long.
  • a MEMS mirror having a length of around 1.2 cm is appropriate to allow for the beam divergence between the LED array and the mirror.
  • the first feature is that light emitted from the LED array 10 is collimated before being reflected by the mirror 1 1 and the second feature is that the mirror 1 1 (or at least the axis A thereof) is placed at the focal plane of imaging optics that are positioned to received light reflected by the mirror 1 1. This ensures that the beam remains parallel to axis of the imaging optics and so provides a telecentric arrangement. This will be described further below with reference to Figures 3 -7.
  • Figure 3 shows light passing from an LED array 20, through a collimation lens LI to a mirror 21 (the rotational axis A of which is perpendicular to the plane of the paper).
  • Figure 3 shows two beams B l ⁇ B2 of light (representing two different angular positions of the mirror about axis A) directed towards imaging optics, in this case an imaging lens L2, which forms an intermediate image 14 as shown.
  • Figure 4 shows a similar arrangement to Fig 3 but also shows an output lens L5 and Figure 5 show the beams as they reach the eye of an observer at an observation plane 15.
  • the mirror axis A is located at the focal plane of the imaging lens L2 as this ensures that the intermediate image is telecentric. This means that as the mirror 21 is scanned about axis A, the beams leaving imaging lens L2 remain directed towards the output lens. If the lens L2 is not correctly positioned, the beams from different scan positions will diverge, as illustrated in Fig 6, and by the time they reach the observation plane 15, light at the extremes of the two beams will have diverged beyond the viewing area of the observer's eye.
  • Another desirable feature is that light reflected by the mirror 11 fills the imaging optics L2 (which is effectively the viewing area of the display to be formed, eg 100mm x 150mm in a HUD).
  • the output lens L2 is only partially filled by light from the beams Bl and B2.
  • the mirror 21 in order to fill of the imaging optics, the mirror 21 must be sufficiently large.
  • design constraints mean that is more difficult to increase the mirror width than the length (ie the dimension parallel to the axis A).
  • This can, however, be resolved by the use a cylindrical telescope, to make the mirror appear wider than it is (although this means that the mirror must scan over a larger angle to achieve the same apparent beam deflection).
  • a spherical telescope if it is desired to enlarge the mirror in two dimensions but if the length of the mirror is not a problem, a cylindrical telescope is sufficient (and simplifies the optic required),
  • Figure 7 illustrates a preferred way of providing such a telescope using two convex lenses L3 and L4.
  • This arrangement allows the image formed by lens L4 also to be telecentric.
  • a conventional form of telescope comprising a concave lens followed by a convex lens (which is the most compact way of producing such a telescope)
  • it is likely to be much more difficult to provide a telecentric arrangement, eg due to the finite thicknesses of the lenses.
  • the convex lens L3 is used to collimate the beams passing therethrough and the concave lens L4 then acts to magnify these (in one or two dimensions depending whether it is a cylindrical or spherical lens).
  • the spacing between these lenses can be adjusted to provide the telecentric arrangement mentioned above without affecting the magnification provided by the telescope.
  • Figure 7 does not show the output lens L5 but it can be seen that the telescope (lenses L3 and L4) widens the beam.
  • the lens separation has also been arranged so that the exiting beams are also both parallel to the optic axis.
  • a cylindrical telescope have a magnification factor of x2, an apparent mirror size, and hence the display size (taking into account the angle of the mirror), of 17 mm long and approximately 12 mm wide can be provided.
  • the collimation lens LI between the LED array 20 and mirror 21 is used to image the LED array onto the mirror.
  • the collimation lens LI is designed to collect sufficient light from the LED array 20 and this is enabled by the mirror 21 being of a substantially similar size to the LED array (or larger),
  • a mirror having a width of a few mm has a high resonant frequency and this provides some immunity from the vibration spectrum of heavy machinery and vehicles (which is typically in the low 100's of Hz).
  • the mirror may operate in the kHz range if the width is as described above,
  • the MEMS mirror 11 would be designed to enable scanning between 100Hz and 10kHz.
  • the scan frequency would be in the range 500Hz- 2kHz. It is desirable for the scan frequency to be as low as possible to simplify the high speed electronics that drive the LED array.
  • the lowest possible operating frequency for MEMS mirror and rotating micro-motor structures is commonly higher than 100Hz.
  • stable resonant frequencies typically He between 1kHz and 20kHz, This is due to the requirement for stable and reliable operation and the subsequent need to minimise coupling of energy into other vibrational modes.
  • the resonant frequencies are far higher than the response of the eye, there is the advantage of a high modulation bandwidth of the display signal resulting in a high dynamic range as each pixel will be written to many times within the response time of the eye.
  • the mirror scan angle would be in the range 5-30 degrees.
  • the lenses referred to above may each comprise one or more optical components and in some cases an array of lenses may be used or a diffractive lens (such as a Fresnel lens),
  • the display to be provided may be in the form of icons or dials, eg for indicating speed, engine temperature, or a graphic showing fill of excavator bucket. These need not be part of the same image so there is no requirement to electronically stitch such images together. Therefore instead of using one large output lens (which impacts on cost and optical quality, as well as size and weight) several smaller lenses can be used. This also allows the effective image area to be of an aspect ratio not normally associated with approximately circularly symmetric optics, such as for example a letterbox shape or a tall column to one side of the driver's main vision.
  • the minimum frame rate for flicker free display is 50 Hz so, in theory, a 20: 1 range is possible, however, if the display is for use in hostile environments subject to high levels of vibration, 100 Hz is preferred.
  • a typical arrangement might, for example use 4 bits per pixel for grey scale providing a 16: 1 dynamic range which yields a frame refresh rate of 62.5 Hz. It will be appreciated that it is necessary to determine the position of the mirror as it is rotated about axis A in order to synchronise the display data generation to enable a stable image to be provided.
  • One way of doing this is to use a photo-detector at one end of the mirror scan field positioned such that it detects the light reflected from the mirror during the scan direction transition period (where no useful image can be generated) and to encode the light pulses to support measurement of scan velocity.
  • the detected pulses will increase in frequency up to a maximum when the mirror is stationary and then reduce again as the mirror accelerates in the opposite direction. This feedback is then used to adjust the mirror drive to maintain stable oscillation and to synchronise the display data generator.
  • the resolution of this method is determined by the speeds of both the LED output pulses and the detector response time, ideally, the detector will utilise light from the LED array and would need to be shielded from ambient light (although synchronising the detection period with the LED drive pulses will provide some noise immunity).
  • an infra-red (IR) source could be used.
  • a head up display may be used with QVGA (Quarter Video Graphics Array) type resolution to display graphics rather than images, but may also have to accept a diversity of video inputs, This can be achieved by a low cost method of video scaling. For example, with a video input having twice as many pixels in both horizontal and vertical resolution, a simple way of scaling this for a HUD would be to add the four together and take the average. This can be achieved with relatively low cost electronics which are compatible with the low cost drivers of the HUD.
  • QVGA Quadrater Video Graphics Array
  • a full colour display may be provided by using three primary colour LED arrays (red, green and blue), a spectral beam combiner and a single MEMS reflector arranged so as to produce a single multi-colour display.
  • each LED array would have its own collimator lens and the coUimated beams would be combined before being passed to the MEMS reflector.
  • the examples given above combine light from one or more two-row arrays of LEDs but it would also be possible to combine light from more rows, eg three or four rows, in order to increase the brightness of the displays. In this case, there would be higher brightness areas in regions where light from separate emitters is overlapping.
  • LED arrays with only a small number of rows have the advantage of being much smaller than the arrays used in the prior art (in which the number of rows corresponds to the number of lines of pixels making up the display). They are much thus easier and hence less expensive to produce and enable the system to be more compact. And as conventional incoherent LEDs are used (as opposed to laser diodes), there are no eye safety issues.
  • the reflector is only required to oscillate or rotate about one axis so is also relatively simple (compared to reflectors that oscillate about two or more axes) and are thus also more suitable for use in environments prone to shock and vibration.
  • At least two linear rows of LEDs are scanned by a reflector oscillating or rotating about a single axis to produce a 2D display and the LEDs in the linear rows are stepped such that the pixel density in the scanned display is higher than that of the light source.
  • the size of the LEDs used may typically vary from state of the art emitter sizes of around lOum, up to a more common sizes of 20um or more.
  • a projection display system such as that described above can be used in a variety of applications., eg in a head up display (HUD) on a window (such as a vehicle windscreen).
  • the imaging optics may be designed such that the display image is projected onto a window, such as a windscreen, without distortion (eg as described in GB2458898).
  • the windscreen or window acts as a reflective optical combiner which combines the projected display with the image of distant objects.
  • the imaging optics may include multiple optical imaging elements, The image is fo cussed by the imaging optics such that the focal point is at a virtual image plane more than 2m from the observer's eye so that the display information can be visible while observing distant objects without any perceived need to refocus eyes,
  • a spherical mirror can be used to image the display instead of such imaging optics.
  • a head-mounted display This may include a helmet mounted display (HMD) or a near to eye (NTE) display.
  • HMD helmet mounted display
  • NTE near to eye
  • the display image is projected onto a helmet visor, optical combiner or the lens surface of a pair of glasses.
  • the light from the display is imaged by the imaging optics so that it is projected to a point further than 2m from the eye so that it will lie within the same focal plane as distant objects.
  • two such arrangements may be used to project a stereoscopic image for both eyes.
  • a further embodiment of the invention which uses sinusoidally resonating mirrors may use a retarding or diverging optical element to project a more uniform illumination density across the scanned display without requiring a reduction in optical power from the LED array during non-linear portions of the scan and resulting in a higher display brightness.
  • the projection display system described herein can be used in a wide range of applications including head up displays, head mounted displays, digital printing systems and any other arrangement requiring an optical image or a light signal to be imaged or scanned over a given area or object.
  • the lines of a display need not necessarily be written in sequence from one side of the display to the other.
  • the lines can be written in any order such that the eye perceives the desired image.
  • the lines may be written in any order such that all of the desired area is exposed as required.
  • the display may be formed on an object or form a virtual image and the object may be stationary relative to the array of LEDs or may be moving relative thereto,
  • Embodiments of the invention may also use arrays of LEDs emitting at a variety of wavelengths (depending upon the application) including non-visible wavelengths, such as ultra-violet, infrared and microwave (and combinations thereof) as well as visible light
  • additional apparatus may then be provided for converting an image to one capable of being seen by the human eye, eg as used in known night vision apparatus.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un système d'affichage par projection comprenant un réseau de diodes électroluminescentes comportant au moins une première et une deuxième rangée de diodes, les diodes dans chaque rangée étant espacées les unes des autres, les diodes dans la deuxième rangée étant décalées dans une direction parallèle à la longueur de la rangée par rapport aux diodes dans la première rangée, un collimateur permettant de collimater la lumière émise par le réseau de diodes électroluminescentes, un réflecteur, un miroir MEMS par exemple, agencé pour tourner par rapport à un axe, le réseau de diodes électroluminescentes étant positionné de façon que la lumière émise par les diodes soit dirigée au travers du collimateur et vers le réflecteur, puis réfléchie pour former un affichage comprenant une ou plusieurs lignes de pixels. Des optiques d'imagerie permettent de recevoir la lumière réfléchie par le réflecteur, et sont positionnées de façon que le réflecteur (ou au moins l'axe de celui-ci) soit situé au niveau du plan focal des optiques d'imagerie de façon à obtenir un agencement télécentrique. Le système d'affichage peut être utilisé dans un affichage tête haute ou un affichage monté sur casque.
PCT/GB2014/051935 2013-06-26 2014-06-25 Système d'affichage par projection WO2014207457A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1311324.6 2013-06-26
GB201311324A GB2515517A (en) 2013-06-26 2013-06-26 A projection display system

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WO2014207457A1 true WO2014207457A1 (fr) 2014-12-31

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WO (1) WO2014207457A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
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CN113703270A (zh) * 2016-12-01 2021-11-26 奇跃公司 具有扫描阵列光引擎的投影仪
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CN110945583B (zh) * 2017-06-23 2022-04-19 惠普发展公司，有限责任合伙企业 控制显示器上的隐私
CN110945583A (zh) * 2017-06-23 2020-03-31 惠普发展公司，有限责任合伙企业 控制显示器上的隐私
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CN110603474A (zh) * 2018-02-06 2019-12-20 谷歌有限责任公司 近眼和头戴式显示器的光束转向光学器件
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CN113885194A (zh) * 2018-04-13 2022-01-04 脸谱科技有限责任公司 扫描显示器
CN111367136B (zh) * 2020-02-15 2022-02-08 江西微瑞光学有限公司 多通道投影光学组件、多通道投影设备以及投影方法
CN111367136A (zh) * 2020-02-15 2020-07-03 江西微瑞光学有限公司 多通道投影光学组件、多通道投影设备以及投影方法
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WO2022029630A1 (fr) * 2020-08-05 2022-02-10 Jade Bird Display (shanghai) Limited Aiguille de balayage et système d'affichage de balayage la comprenant
US11527572B2 (en) 2020-08-05 2022-12-13 Jade Bird Display (shanghai) Limited Scan needle and scan display system including same
CN114185169A (zh) * 2020-08-25 2022-03-15 成都理想境界科技有限公司 一种散射屏参数优化方法、散射屏及可读存储介质
CN114185169B (zh) * 2020-08-25 2024-03-05 成都理想境界科技有限公司 一种散射屏参数优化方法、散射屏及可读存储介质

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