WO2016181134A1 - Systèmes d'affichage - Google Patents

Systèmes d'affichage Download PDF

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Publication number
WO2016181134A1
WO2016181134A1 PCT/GB2016/051343 GB2016051343W WO2016181134A1 WO 2016181134 A1 WO2016181134 A1 WO 2016181134A1 GB 2016051343 W GB2016051343 W GB 2016051343W WO 2016181134 A1 WO2016181134 A1 WO 2016181134A1
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WO
WIPO (PCT)
Prior art keywords
light emitting
wheel
image
emitting elements
strip
Prior art date
Application number
PCT/GB2016/051343
Other languages
English (en)
Inventor
Guy Margetson
Michael Andrew Beadman
Ben James Crundwell
Willem Paul Beeker
Original Assignee
Speed Of Light Holdings 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 Speed Of Light Holdings Limited filed Critical Speed Of Light Holdings Limited
Priority to EP16724097.7A priority Critical patent/EP3341929B1/fr
Priority to ES16724097T priority patent/ES2959209T3/es
Publication of WO2016181134A1 publication Critical patent/WO2016181134A1/fr

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Classifications

    • 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
    • G09G3/005—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes forming an image using a quickly moving array of imaging elements, causing the human eye to perceive an image which has a larger resolution than the array, e.g. an image on a cylinder formed by a rotating line of LEDs parallel to the axis of rotation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0492—Change of orientation of the displayed image, e.g. upside-down, mirrored

Definitions

  • This invention relates to methods and apparatus for electronically displaying information on the wheel of a vehicle.
  • a method of displaying information on the wheel of a vehicle comprising: mounting first and second strips of light emitting elements on the wheel such that they lie substantially along first and second radii of the wheel; wherein said light emitting elements are arranged along each said strip and define radial lines of pixels; and wherein radial positions of the light emitting elements of said first strip are interleaved in a radial direction with respect to positions of the light emitting elements of said second strip; and driving said first and second strips of light emitting elements to display an image, wherein said image is represented by radial lines of pixels at successive angular positions; and wherein said driving comprises: driving said first strip of light emitting elements with a first subset of pixels of a first radial line of said image at a first said angular position in the image when said first strip of light emitting elements is at a reference angular position; driving said second strip of light emitting elements with a second subset of pixels of said first radi
  • a display somewhat akin to an interlaced television display is created, by defining interlaced display lines (more properly “rings") using interleaved light emitting elements on two (or more) strips of light emitting elements.
  • interlaced display lines more properly “rings”
  • the subsets of displayed pixels are interleaved correspondingly with the light emitting elements of said first and second strips of light emitting elements.
  • two strips are employed with two-times interleaving, but in principle three or more strips could be employed with three or more times interleaving.
  • the n strips are driven with Mn of the display pixels when at the reference position - which may be, for example, top dead centre (TDC) of the system when mounted on the wheel.
  • TDC top dead centre
  • the number of rows may be adapted to the vehicle, more particularly to a usual speed of the vehicle. For example for a relatively slow moving vehicle such as a city taxi it can be advantageous for three, four, five or more strips of light emitting elements to be employed, to reduce flicker where the wheel speed is not sufficient to provide persistence of vision.
  • the strips of light emitting elements need not lie along radii of the wheel - for example two strips may be positioned, one to either side of a radius. However if the strips do not lie along radii this tends to smear the resulting display.
  • the light emitting elements are arranged substantially regularly along each strip. Potentially, however, a greater number density of elements may be employed at larger radii to compensate for effectively decreasing brightness with increasing radius.
  • the light emitting elements comprise colour light emitting elements - for example each element may comprise three differently coloured LEDs (light emitting diodes), optionally with a shared diffuser. Preferably high brightness LEDs are employed, for example greater than l OOOmcd.
  • the displayed image is substantially non- rotating.
  • the image itself may be static or animated. In preferred embodiments, therefore, a rotational position of the wheel is sensed and the strips of light emitting elements are driven synchronously with rotation of the wheel such that they appear to display a substantially non-rotating image.
  • a rotational position of the wheel is sensed and the strips of light emitting elements are driven synchronously with rotation of the wheel such that they appear to display a substantially non-rotating image.
  • a rotational position of the wheel is sensed and the strips of light emitting elements are driven synchronously with rotation of the wheel such that they appear to display a substantially non-rotating image.
  • a rotational position of the wheel is sensed and the strips of light emitting elements are driven synchronously with rotation of the wheel such that they appear to display a substantially non-rotating image.
  • a magnetic sensor such as a Hall effect sensor
  • each strip of light emitting elements is driven with appropriate image data when that strip is at or passing a reference angular position, such as top dead centre of the wheel.
  • the appropriate image data is readily determined if the image is represented in polar co-ordinates (where rows and columns of a Cartesian image translate to "rings" and "radii" in a polar co-ordinate system).
  • each radial line of the image may be considered as comprising first and second interleaved subsets of pixels of the image (or more subsets with greater interleaving).
  • the second strip of light emitting elements is driven with a first subset of pixels of a second radial line of the image when the first strip of light emitting elements is at or adjacent the reference angular position.
  • the second radial line of the image is angularly displaced (in polar co-ordinates) from the first radial line of the image by the included angle between the strips of light emitting elements.
  • the first strip of light emitting elements is driven with the second subset of pixels of the second radial line of the image when the first strip of light emitting elements is at or adjacent a position defined by the reference angular position offset by the included angle.
  • this approach may be extended to three or more strips of light emitting elements.
  • the first and second strips of light emitting elements are driven simultaneously, in particular when the first strip of light emitting elements is at the angular reference position.
  • the driving is staggered or offset so that the first and second strips of light emitting elements have a reduced overlap, or no overlap (in time), to smooth the current consumption and in particular to reduce the peak current consumption. This is potentially advantageous where high current, high brightness LEDs are employed.
  • embodiments of the technique effectively multiply the resolution of the display by a factor of n, where n is the number of interlaced rings of pixels, and also facilitate achieving a brighter display.
  • the image represented by the display may have a number of radial pixels (akin to pixels in columns of the display) defined by the total number of pixels in the strips of light emitting elements.
  • the image may have a resolution of 160 radial pixels if two strips of 80 pixels are employed.
  • additional strips of light emitting elements may be employed to effectively duplicate the information already displayed, for example for increased brightness or reduced flicker at low speeds.
  • a third and/or fourth strip of light emitting elements could be employed to display other "columns" of the image at different angular positions, but with pixels at the same radial positions as, say, the first and second strips.
  • the number of “columns” may be defined by how fast the light emitting elements "flash” or change their data as the device rotates; this number may be relatively high, for example greater than 1000 pixels, such as 1080 or 1920 pixels (equivalent to high definition television).
  • the image is effectively divided into two (or more) interlaced frames.
  • a controller or driver(s) of the system may automatically generate the interleaved data for driving these strips of light emitting elements.
  • two separate image frames may be provided to the system, each at Mn resolution. In this latter case the two images are preferably angularly displaced from one another by the included angle between the strips of light emitting elements (expressed in terms of a pixel count). This simplifies the simultaneous or staggered driving of the two strips of light emitting elements.
  • references to 'pixels' are to pixels of a single colour display, or to pixels comprising two, three or more colour sub-pixels of a multicolour display.
  • One application is to provide a display on two or more wheels of a racing vehicle such as a racing car for displaying information, advertising and the like.
  • the two front (or two rear) wheels of a car or other vehicle rotate in opposite senses - that is one rotates clockwise whilst the other rotates anticlockwise.
  • it is desirable to display an image with the correct (mirror reflection) handedness - for example where it includes text - one approach is to provide left handed and right handed versions of the system for mounting on corresponding wheels.
  • the system may automatically detect a sense of rotation of the wheel to determine how the image is displayed, that is whether 'columns' (radii) of the image are read out clockwise or counter clockwise.
  • a sense of rotation of the wheel may be employed to determine how the image is displayed, that is whether 'columns' (radii) of the image are read out clockwise or counter clockwise.
  • the system can be preferable to provide two modes of operation for controlling the brightness of a light emitting element.
  • low light outputs for example at some level less than 50% full output
  • pulse width modulation This is because LED response can be non-linear at low drive levels and PWM can achieve accurate dark (low output) levels, with good linearity and high contrast.
  • PWM pulse width modulation
  • PWM can result in the appearance of radial stripes on the display. This is because at high brightness there is a proportion of time where the LED is on as a strip sweeps around its path, and a further proportion of time where the LED is off. Since these periods can align the result can be dark radial stripes. It can therefore be preferable to control the brightness of a light emitting element at relatively higher brightness by controlling a drive current or voltage of the light emitting element rather than by employing PWM control.
  • the image data may be delivered in an appropriate form (preferably in polar coordinates), to a display device for attaching to the wheel of a vehicle.
  • the system may include software, for example to run on a general purpose computer system, for generating data for the image.
  • Image data for the system may be generated by mapping Cartesian input image data into polar co-ordinate image data.
  • the input image pixels in Cartesian co-ordinates
  • the input image pixels are smaller, that is have a smaller area, than display pixels displayed by the strips of light emitting elements on the rotating wheel.
  • one preferred mapping procedure comprises tiling a region of the image with display pixels as displayed by the rotating strips of light emitting elements (that is the interlaced display pixels).
  • a value for each display pixel is obtained from the one or more Cartesian image pixels it partially or wholly covers.
  • a brightness or colour value for a display pixel may be selected based upon an average of the Cartesian image pixels it covers, preferably a weighted average dependent upon a proportion of a Cartesian image pixel covered.
  • the invention provides a device for displaying information on the wheel of a vehicle, the device comprising: a mount for attaching to the wheel of vehicle, the mount comprising: first and second strips of light emitting elements disposed such that when the device is attached to the wheel said first and second strips lie along respective first and second radii of the wheel for defining radial lines of pixels; and wherein radial positions of the light emitting elements of said first strip are interleaved in a radial direction with respect to positions of the light emitting elements of said second strip.
  • data for driving the strips of light emitting elements may be transmitted on- the-fly to the device via a wired or wireless link, but in preferred embodiments data for displaying an image using the strips of light emitting elements is stored in local memory.
  • the device includes a controller to control illumination of the light emitting elements of the first and second strips in accordance with the stored image data.
  • the image data is stored in polar co-ordinates so as to simplify this process.
  • the device includes a sensor to sense a rotational position of the wheel so that the light emitting elements can be driven synchronously with rotation at the wheel, so as to display a substantially non-rotating image.
  • the sensor also detects whether the wheel is rotating clockwise or anticlockwise, and controls the image display accordingly so that the image is displayed with the same mirror reflection handedness whichever direction the wheel is rotating.
  • the device includes drivers for the light emitting elements.
  • the drivers are able to operate in two modes, a first, PWM mode in which brightness of a light emitting element is controlled primarily by a pulse with modulation, and a second current/voltage control mode in which brightness of a light emitting element is controlled primarily by the level of a current and/or voltage drive to the element.
  • Preferred embodiments also provide radial-distance-based brightness compensation as previously described.
  • the controller, or a driver, a combination of the two may drive elements at a greater radial distance more brightly than those closer to a centre of the wheel.
  • the device may be battery powered - such an approach is suitable, for example, for motor sport applications.
  • Other embodiments of the device are able to harvest power for driving the light emitting elements from rotation of the wheels.
  • the device may include a generator (or at least the rotor part of a generator), preferably in combination with an electrical power store such as a rechargeable battery.
  • the generator may comprise a set of one or more magnets mounted to a part of the vehicle which is stationary with respect to the wheel, for example a region behind the wheel.
  • the magnets may be permanent or electromagnets. This provides a stator for the generator.
  • a second set of one or more coils may then be mounted on the device to generate power from rotation of the wheel.
  • the mount for the device may comprise a one-way freewheel clutch such as a sprag clutch.
  • a sprag clutch This allows the device to continue to rotate when the wheel stops rotating, for example at traffic lights. In this way an image can be displayed by the rotating device whilst a vehicle is substantially stationary, which is potentially a particularly advantageous type of display for advertising and the like.
  • the device may even include a motor to rotate the device when the wheel is stationary. Such a motor may be powered by energy previously harvested from rotation of the wheel whilst the vehicle was in motion.
  • the invention provides a method of displaying information on the wheel of a vehicle, the method comprising: mounting at least one strip of light emitting elements on a support configured for attaching to a wheel; attaching the support to the wheel said that the support is able to rotate with the wheel and is able to continue rotating when the wheel ceases to rotate; and driving said at least one strip of light emitting elements whilst the support is rotating and the wheel is not rotating, synchronously with the rotation of the support, such that the light emitting elements appear to display a substantially non-rotating image whilst the support is rotating when the vehicle is stationary.
  • the device may be mounted on or used as a substitute for a hub cap of the wheel.
  • the device may be mounted on or used as a substitute for a hub cap of the wheel.
  • the invention also provides a device for displaying information on the wheel of a vehicle, the device comprising: a mount for attaching to the wheel of vehicle, the mount comprising a one-way freewheel clutch to allow the device to rotate when said wheel is stationary; and bearing at least one strip of light emitting elements.
  • the invention still further provides a display system comprising: a device for attaching to a wheel of a vehicle; the device comprising at least one strip of light emitting diode (LED) pixels which, when the device is attached to said wheel extend in a radial direction; and wherein the device is configured such that, when said vehicle is in motion, the device displays an image formed by said strip of LED pixels lighting in synchronism with rotation of the wheel; and such that, when said vehicle is stationary, the device rotates to display said image in synchronism with rotation of the device, using said strip of LED pixels.
  • a display system comprising: a device for attaching to a wheel of a vehicle; the device comprising at least one strip of light emitting diode (LED) pixels which, when the device is attached to said wheel extend in a radial direction; and wherein the device is configured such that, when said vehicle is in motion, the device displays an image formed by said strip of LED pixels lighting in synchronism with rotation of the wheel; and such that, when said vehicle is stationary
  • a motor and generator function of the device are combined.
  • the device may be provided with a set of rotor coils to interact with a corresponding set of stator coils to generate power when the vehicle is rotating, and to drive the device to rotate when the vehicle is stationary.
  • the stator coils may generate a magnetic field to drive the rotor coils of the device to rotate the device.
  • the device may include part of an axial flux or pancake motor, another part of which is attached to a stationary part of the vehicle, for example to a bearing mount of the wheel.
  • Figures 1 a to 1 e show, respectively, front and side views of a display device according to an embodiment of the invention, first and second enlarged views of light emitting elements of the device, and a schematic illustration of the device attached to the wheel of the vehicle:
  • Figure 2 shows a block diagram of the device at Figure 1 ;
  • Figures 3a and 3b show a schematic representation of image data for display using the device of Figure 1 , and a flow diagram for display of the image data;
  • Figures 4a and 4b show, respectively, a flow diagram of a pixel display procedure and a schematic illustration of pulse width modulated displayed pixels
  • Figure 5 illustrates a method for converting Cartesian image data to polar co-ordinate image data for use in embodiments of the invention
  • Figure 6 shows a schematic view of a cross-section through a vehicle wheel assembly including a display device configured for rotation when the vehicle wheel is stationary.
  • FIGS 1a and 1 b show front and side views respectively of an embodiment of a display device 100 for displaying information on the wheel of a vehicle, according to embodiments of the invention.
  • the device is fabricated on a printed circuit board 102, provided with a number of mounting holes for attaching to the wheel of a vehicle.
  • a housing for the device may, but need not be provided.
  • details of the electronic components are not shown in Figures 1 a and 1 b, but are described later with reference to Figure 2.
  • the device comprises first and second strips 110, 1 12 of light emitting elements, in preferred embodiments relatively large, high-brightness light emitting diodes (LEDs), for example 3 mm, 2500mcd LEDs.
  • LEDs light emitting diodes
  • each strip has around 80-100 LEDs, but it will be appreciated that this number may be varied. Similarly, although two strips are shown more may optionally be employed.
  • the LEDs 1 14 of the first strip are offset radially with respect to the locations of the LEDs 1 16 of the second strip.
  • the offset is half a pixel (as there are two strips) so that the centres of the LEDs are interleaved.
  • Figure 1d shows an enlargement of a single LED which may, in embodiments, comprise red, green and blue (R, G, B) LEDs under a common diffuser 118.
  • Figure 1e shows the device mounted on the wheel 150 of a vehicle. As can be seen, preferably the device does not extend quite to the central hub 152 because this introduces difficulties in mapping an image onto the rotating wheel.
  • a magnetic (Hall) sensor 122 is mounted on a projection 120 extending behind the device into the wheel assembly. This interacts with a magnet mounted on the wheel assembly, for example at a top dead centre (TDC) position ( Figure 1 e). In this way the device can be synchronised with the rotation speed and position of the wheel.
  • Figure 2 shows a block diagram of electronics for the device of Figure 1 , to control the device to provide an interlaced display synchronous with rotation of the wheel.
  • the device is controlled by a controller 200, which may comprise dedicated hardware such as a gate array, or a microcontroller, or a combination of the two.
  • the controller is coupled to a set of drivers 202, 204, one for each strip of LEDs 1 10, 112. In embodiments one driver is provided for each RGB colour.
  • the controller is coupled to image memory 206 which stores one or more images for display, preferably in polar co-ordinates and with a resolution adapted to the number of rows (rings) and columns (radii) implemented by the device.
  • the total number of rows (rings) is defined by the total number of LEDs in strips 110, 1 12; the number of 'columns' is effectively defined by the number of 'flashes' which the LEDs make in one rotation of the wheel. It will be appreciated that it is relatively straightforward to change this latter parameter; in an example embodiment the device may have 1500 'columns'.
  • the controller 200 reads the image data and drives LED strips 110, 112 in an interleaved manner, as described later.
  • image memory 206 may effectively store a pair of separate images, each at half resolution, for interleaved display.
  • the device includes RF communications 208 such as a BluetoothTM or WiMaxTM RF link.
  • the device includes a sensing and timing (clock) module 210. In some preferred embodiments this provides one pulse per revolution, indicating when the device is at top dead centre (TDC) of the wheel.
  • TDC top dead centre
  • the device is powered by a (rechargeable) battery 212. Depending upon the display brightness a battery life of around an hour may be obtained, which is sufficient for motorsport use.
  • the device includes a power supply unit 214 coupled to a power recovery system 216, to harvest power from rotation of the wheel. In a simple embodiment this may be achieved by providing a coil on the device which, in conjunction with a magnet on a stationary part of the wheel assembly, acts as a generator. Referring to Figure 3a this shows columns of a displayed image 'unwrapped' - that is showing angular positions ⁇ 0, ⁇ 1 , ⁇ 2 and so forth at which the strips of LEDs are driven.
  • angles ⁇ may be labelled with equivalent column display times.
  • ⁇ measures the angle between the strips of LEDs in terms of the number of columns of the displayed image.
  • Figure 3b shows a flow diagram of a procedure for driving the strips of LEDs.
  • the procedure or controller 200 reads the data for strip /, and at step S302 drives a first strip of LEDs 1 10 with the data for every other row (ring) in this column of the image.
  • the procedure also reads data for strip / ' + ⁇ from the image memory (step S304), and drives the second strip of LEDs 1 12 with data for every other row (ring) in this column.
  • the data driven in step S306 is interleaved with the data driven in step S302 - that is if, say, one strip of LEDs is driven with even pixels of the image, the other is driven with odd pixels of the image. Since, in embodiments, the LEDs in the two strips are displaced by half a pixel with respect to one another this effectively creates an interlaced display with double the resolution achievable with a single strip of LEDs.
  • ⁇ is an integer. More particularly ⁇ represents the number of 'columns' of the image through which the device must rotate in order for the position originally occupied by strip 1 10 to be occupied by strip 1 12 (or vice versa).
  • the order of reading the columns of data for display may depend upon the sense of rotation of the wheel which, optionally, may be determined by a sensor.
  • the two strips of LEDS are illuminated at the same time, but in an alternative approach the illumination of these strips of LEDs may be offset (for example displaced by half an angular pixel relative to one another) to smooth the current consumption.
  • this shows an example of a procedure implemented by controller 200 of Figure 2 to convert colour image data from image memory 206 to data for display on the strips of LEDs 1 10, 1 12.
  • RGB colour values are used but it will be appreciated that other colour space representations may be employed.
  • the controller reads target RGB pixel value data and, at step S404, performs a brightness correction for radial position of the target LED pixel. This may comprise, for example, scaling by the square of the radial position of the pixel (distance to the centre of the wheel).
  • the procedure also performs a gamma correction (S406) to improve the appearance of the displayed image.
  • the controller then outputs, for example, 24 bits of data per pixel, 8 bits for each (corrected) colour; this provides a large dynamic range, which is helpful.
  • FIG. 4b illustrates a portion of a displayed image in which the LEDs are controlled using pulse width modulation: the LEDs are on 402 for some proportion of the total angular extent of a pixel and off 404 for the remaining proportion of the angular extent. As illustrated in Figure 4b this can result in radial stripes, but these are not easy to see when region 402 is of low brightness.
  • pulse width modulation is used for low LED brightness levels because this can provide good linearity (current drive tends to be non-linear at low levels).
  • current drive control is employed at high brightness levels to avoid the appearance of dark stripes from regions 404.
  • FIG. 5 shows how an image 500 with square or rectangular pixels 502, defined in Cartesian co-ordinates, may be converted to pixel data for an image 550, which is substantially circular and defined by rotating strips of LEDs.
  • region 550 is tiled by pixels 552 of a shape provided by rotation of the device 100.
  • pixels 552 are essentially non- overlapping, and that these tile the image 550 at a resolution of the interleaved display. That is although the interleaved rows (rings) of the display will in practice overlap ( Figure 1 c), a non-overlapping assumption is made when converting to image data for display.
  • the pixels are defined by the angular positions of the 'columns' of the display at angles ⁇ 0, ⁇ 1 and so forth (for clarity only two such angles are illustrated).
  • polar pixel 552a intersects Cartesian pixels 502a-h.
  • a brightness, or in preferred embodiments a colour is selected for the polar pixel based on data from the Cartesian pixels it intersects. This may be done by, for example, taking an average, more preferably a weighted average of the values of the set of Cartesian pixels it intersects.
  • pixel 552a barely intersects pixels 502e, f, g, h, and these therefore receive a low weighting.
  • the procedure steps through each of the polar pixels, determining the value for each pixel in this way to generate image data for storage in memory 206 and display.
  • the three colour channels (RGB) may be treated essentially independently.
  • Figure 6 shows a version of a wheel-mounted display device 600 which rotates with the vehicle wheel but which continues rotating when the wheel ceases to rotate and which, in embodiments, may be driven to rotate under these conditions.
  • Figure 6 shows the device 600 mounted on a wheel assembly 650, shown in simplified cross-section.
  • the wheel assembly comprises an axle 652 mounted in a wheel bearing 654, and supporting a plate 656 mounting a wheel 658 with a tyre 660.
  • the device 600 is mounted on a rotating part 662 of the wheel (which may comprise a hub cap) via a one-way freewheel clutch 664, in embodiments a sprag clutch. As illustrated in cross- section, embodiments of device 600 may be generally circular rather than of the generally longitudinal type illustrated in Figure 1.
  • the sprag clutch 664 drives the device 600 to rotate with the wheel, but when the wheel slows or ceases rotating the device 600 is able to continue to rotate substantially freely.
  • Device 600 preferably includes a sensor, such as a magnetic sensor, to identify a reference angular position of the device relative to wheel 658, and bears one or more strips of LEDs to display an image, preferably a substantially non-rotating image, as the device rotates. For simplicity in Figure 6 the one or more strips of LEDs are not shown.
  • the (magnetic) sensor may be of the type previously described or may be integrated with the motor/generator described below.
  • the device may be applied to slow moving vehicles, for example in city traffic. In such applications it can be useful to have more than two strips of LEDs, to help give the appearance of a substantially non-flickering display even when the device is rotating relatively slowly.
  • embodiments of device 600 may include a set of one or more coils 602 to interact with a set of one or more magnets 604 on a portion of the wheel assembly which is stationary relative to the rotating wheel.
  • Magnets 604 may be permanent magnetic or electromagnets.
  • coils 602 may form part of the rotor of a generator to generate power for device 600, coils 604 comprising the stator of the generator.
  • Power from coils 602 may be temporarily stored on device 600, for example in a battery or supercapacitor.
  • the wheel slows or stops coils 602 may be driven so that device 600 then becomes the rotor of a motor, the stator of which is defined by magnets 604. In this way an image may be displayed or maintained when the vehicle is stationary.
  • an image may be selectively displayed only when the vehicle is below a threshold speed or substantially stationary, for example for safety reasons.
  • when the vehicle is slow or stopped device 600 may be driven to rotate by driving coils 604 to act on coils (magnets) 602, for example driving coils 604 with a rotating magnetic field to drive rotational device 600.

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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

La présente invention concerne un procédé d'affichage d'informations sur la roue d'un véhicule, le procédé consistant à : monter des première et seconde bandes d'éléments électroluminescents sur la roue, de sorte à être agencées sensiblement le long de premier et second rayons de la roue; lesdits éléments électroluminescents étant agencés le long de chacune desdites bandes et définissant des lignes radiales de pixels; et des positions radiales des éléments électroluminescents de ladite première bande étant entrelacées dans une direction radiale par rapport aux positions des éléments électroluminescents de ladite seconde bande; et exciter lesdites première et seconde bandes d'éléments électroluminescents de sorte à afficher une image, ladite image étant représentée par des lignes radiales de pixels à des positions angulaires successives; et ladite excitation consistant à : exciter ladite première bande d'éléments électroluminescents au moyen d'un premier sous-ensemble de pixels d'une première ligne radiale de ladite image à une première position angulaire dans l'image lorsque ladite première bande d'éléments électroluminescents se trouve à une position angulaire de référence; exciter ladite seconde bande d'éléments électroluminescents au moyen d'un second sous-ensemble de pixels de ladite première ligne radiale de ladite image au niveau de ladite première position angulaire dans l'image lorsque ladite seconde bande se trouve à ladite position angulaire de référence ou à proximité de celle-ci, lesdits premier et second sous-ensembles de pixels comprenant des pixels entrelacés de ladite première ligne radiale de ladite image.
PCT/GB2016/051343 2015-05-11 2016-05-11 Systèmes d'affichage WO2016181134A1 (fr)

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ES16724097T ES2959209T3 (es) 2015-05-11 2016-05-11 Sistemas de visualización

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EP3341929A1 (fr) 2018-07-04
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GB201507979D0 (en) 2015-06-24
EP3341929B1 (fr) 2023-07-05

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