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WO2008139174A1 - Procédé et appareil d'étalonnage - Google Patents

Procédé et appareil d'étalonnage Download PDF

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Publication number
WO2008139174A1
WO2008139174A1 PCT/GB2008/001635 GB2008001635W WO2008139174A1 WO 2008139174 A1 WO2008139174 A1 WO 2008139174A1 GB 2008001635 W GB2008001635 W GB 2008001635W WO 2008139174 A1 WO2008139174 A1 WO 2008139174A1
Authority
WO
WIPO (PCT)
Prior art keywords
intensity
wavelength
array
preset signal
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2008/001635
Other languages
English (en)
Inventor
James Sirmon
Anthony Cole
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Litelogic Ltd
Original Assignee
Litelogic Ltd
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 Litelogic Ltd filed Critical Litelogic Ltd
Publication of WO2008139174A1 publication Critical patent/WO2008139174A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]

Definitions

  • the display device may be a static display device made up of a plurality of panels of arrays of lights sources, or it may be of the type in which the intensity of light emitted by each light source in the array is modulated as it rotates around an axis so that the light sources in combination cause a desired image to be visible to ah observer by virtue of persistence of vision.
  • Such types of display device are well known and several examples are described in our co-pending PCT patent application, published as WO2006/021788.
  • the arrays of lights sources used in such display devices typically comprise a set of light emitting diodes (LEDs) mounted on a printed circuit board (PCB).
  • LEDs light emitting diodes
  • PCB printed circuit board
  • a method for calibrating an array of light sources for use in a display device in which the intensity of light emitted by each light source in the array is modulated as it rotates around an axis so that the light sources in combination cause a desired image to be visible to an observer by virtue of persistence of vision comprising: a) supplying a preset signal to a first light source in the array, the preset signal being associated with a desired value of the wavelength and/or intensity of light emitted by the first light source; b) monitoring the wavelength and/or intensity of the light emitted by the first light source; c) determining a compensation factor to be applied to the preset signal such that the monitored wavelength and/or intensity has the desired value; d) storing the compensation factor; and e) carrying out steps (a) to (d) for each other light source in the array.
  • apparatus for calibrating an array of light sources comprising a monitoring device for monitoring the wavelength and/or intensity of the light emitted by the light sources in the array and a controller adapted to: a) supply a preset signal to a first light source in the array, the preset signal being associated with a desired value of the wavelength and/or intensity of light emitted by the first light source; b)determine a compensation factor to be applied to the preset signal such that the monitored wavelength and/or intensity of the light emitted by the first light source has the desired value; c) store the compensation factor; and d) carry out steps (a) to (c) for each other light source in the array.
  • this invention provides a method and apparatus for calibrating the light sources in an array so that they all produce the same brightness and/or colour of light when provided with the same current.
  • the compensation factor that is determined effectively forms an adjustment which will be made to signals applied to the light sources in use such that it can be ensured that they always emit light of the expected wavelength and/or intensity.
  • the preset signal will depend on the nature of the light sources in the array. For example, if the light source is a simple single-colour LED for a monochromatic display then the preset signal may simply be a preset current or voltage. It may alternatively be a pulse width modulated signal.
  • the preset signal will typically be a composite signal.
  • this composite signal there will be three components, each one of which controls the quantity of a respective red, green or blue component of the light emitted by the light source.
  • each component of the composite signal may be a preset current or voltage, or a pulse width modulated signal.
  • the compensation factor may affect the colour balance (i.e. wavelength) of light emitted by the light source by causing each of the components of the preset signal to vary relative to each other. It may also, or instead, affect intensity (i.e. brightness) of light emitted by the light source by causing each of the components of the preset signal to vary in unison with each other.
  • each light source in the array is a light emitting diode (LED).
  • LED light emitting diode
  • each light source is a tricolour LED.
  • Each light source in the array may be a triad of red, green and blue light sources.
  • each of the red, green and blue light sources in the triad may be a discrete LED.
  • the wavelength and/or intensity of the light emitted by the first light source is monitored by visual inspection allowing for a manual calibration process.
  • the monitoring device may comprise an optical viewer for visual inspection of the wavelength and/or intensity of the light emitted by the light sources in the array.
  • the optical viewer may comprise a frustoconical element having an aperture at each end, the aperture at the smaller end lying adjacent to the array of light sources.
  • the inside surface of the frustoconical element may be polished.
  • the frustoconical element may be made from a metal.
  • the controller may be further adapted to adjust the preset signal in accordance with user input until the monitored wavelength and/or intensity equals the desired value of wavelength and/or intensity, and to set the compensation factor depending on the degree of adjustment required to the preset signal so that the monitored wavelength and/or intensity equals the desired value of wavelength and/or intensity.
  • the user input is typically generated by a joystick.
  • the joystick is preferably a three-axis joystick, each axis representing a degree of adjustment required to a respective one of the red, green and blue components of the monitored wavelength and/or intensity so that it equals the desired value of wavelength and/or intensity.
  • the controller may be further adapted to set the compensation factor to be the ratio between the adjusted preset signal and the preset signal.
  • the wavelength and/or intensity of the light emitted by the first light source are monitored electronically allowing an automatic or semiautomatic process of calibration.
  • the monitoring device comprises a photometer, which generates output signals indicating the monitored wavelength and/or intensity.
  • the controller may be further adapted to receive the output signals from the photometer, to adjust the preset signal so that the output signals from the photometer indicate that the monitored wavelength and/or intensity equals the desired values of wavelength and/or intensity, and to set the compensation factor depending on the degree of adjustment required to the preset signal so that the monitored wavelength and/or intensity equals the desired values of wavelength and/or intensity.
  • the controller may be further adapted to adjust the preset signal in accordance with user input.
  • This allows a semi-automatic process in which, for example, a user can observe the output signals from the photometer to obtain an indication of the monitored wavelength and/or intensity and then refer to a table of correction values to input to the controller to allow it to adjust the preset signal accordingly. It also allows the user to override an automatic process.
  • the user input is generated by a joystick.
  • the joystick is preferably a three-axis joystick, each axis representing a degree of adjustment required to a respective one of the red, green and blue components of the monitored wavelength and/or intensity so that it equals the desired value of wavelength and/or intensity.
  • the controller may be further adapted to adjust the preset signal in accordance with a predetermined algorithm.
  • the controller may be further adapted to set the compensation factor to be the ratio between the adjusted preset signal and the preset signal.
  • the monitoring device may be movable relative to the array so that each of the light sources in the array may be brought into alignment with the monitoring device.
  • the apparatus further comprises a motor operable by the controller for moving the monitoring device relative to the array.
  • the controller may be further adapted to store the compensation factor along with the desired values of wavelength and/or intensity of light associated with the preset signal.
  • the controller may be further adapted to repeat steps (a) to (c) with two or more different preset signals.
  • the array further comprises a memory device for storing the compensation factor for each light source, and the compensation factor is stored in a memory device associated with the array.
  • the method and apparatus of the first and second aspects of the invention may also be used to calibrate PCBs which are to be used as replacements in a display system which has already been commissioned, for example because a PCB has developed a fault.
  • the light sources on the replacement PCB match the intensity and/or wavelength of the light sources on the other PCBs making up the display.
  • the light sources on the replacement need to be artificially aged to match the light sources on the other PCBs in the display because the light sources on the other PCBs are likely to have deteriorated somewhat during the passage of time, which it is known causes the output of light sources such as LEDs to decrease.
  • the desired value may be determined by monitoring the wavelength and/or intensity of light emitted by a corresponding light source on a reference array of light sources and setting the desired value to be equal to the monitored wavelength and/or intensity.
  • This determination of the desired value of wavelength and/or intensity will of course typically be repeated for each light source in the array so that there is correspondence between each light source in the array and each corresponding light source in the reference array. This provides a natural-looking effect when the replacement array is installed.
  • the controller may be further adapted to determine the desired value by causing the photometer to monitor the wavelength and/or intensity of light emitted by a corresponding light source on a reference array of light sources and receiving the generated output signals from the photometer, setting the desired value to be equal to the monitored wavelength and/or intensity based on the output signals from the photometer, and storing the desired value in a memory.
  • the desired value may be determined by monitoring the wavelength and/or intensity of light emitted by all of the light sources on a reference array of light sources and setting the desired value to be equal to the average of the monitored wavelengths and/or intensities.
  • the controller may be further adapted to determine the desired value by causing the photometer to monitor the wavelength and/or intensity of light emitted by each light source on a reference array of light sources and receiving the generated output signals from the photometer, setting the desired value to be equal to the average of the monitored wavelengths and/or intensities based on the output signals from the photometer, and storing the desired value in a memory.
  • the method according to the first aspect and the apparatus according to the second aspect may be used to calibrate an array of light sources for use in a display device in which the intensity of light emitted by each light source in the array is modulated as it rotates around an axis so that the light sources in combination cause a desired image to be visible to an observer by virtue of persistence of vision.
  • the method according to the first aspect and the apparatus according to the second aspect may be used to calibrate an array of light sources for use in a display device comprising a plurality of arrays of static light sources.
  • an array of light sources calibrated by the method of the first aspect In a third aspect of the invention, there is provided an array of light sources calibrated by the method of the first aspect. In a fourth aspect, there is provided an array of light sources calibrated using the apparatus of the second aspect.
  • Figure 1 shows a system for manual calibration of an array of LEDs
  • Figure 2 shows an enhancement of this system to allow automatic calibration of an array of LEDs.
  • Figure 1 shows a PCB 1 on which are mounted an array of LEDs 2 set out in a line at one edge of the PCB 1.
  • the PCB 1 is suitable for use in a rotating-type display device in which the intensity of light emitted by each LED in the array 2 is modulated as it rotates around an axis so that the light sources in combination cause a desired image to be visible to an observer by virtue of persistence of vision.
  • a display device will comprise more than one array of LEDs.
  • the PCB 1 also carries a solid-state memory device 3.
  • This memory device 3 can be used to store a respective compensation factor for each of the LEDs in the array
  • the compensation factor will then be applied to drive signals supplied to that LED in future so that it can be ensured that the desired wavelength and/or intensity of light are emitted by the LED.
  • the array can be calibrated.
  • the array of LEDs 2 is shown located in a calibration jig in Figure 1 , and is held fast between two end walls 4a and 4b of the jig. Extending between these two end walls 4a and 4b is a rail 6 on which is mounted a carriage 5.
  • the carriage 5 carries an optical viewer 7.
  • the carriage 5 is slidable along the rail 6 so that the optical viewer 7 can be brought into alignment with any one of the LEDs in the array 2.
  • the optical viewer could take many forms. For instance, it could simply be a hole drilled in the carriage 5 lying directly above the array of LEDs 2. However, in this instance a frustoconical metal or plastic element is provided having an aperture at each end. The interior surface may be polished. The larger aperture is coincident with a similarly-sized aperture in the carriage 5 whilst the smaller aperture lies directly above the array of LEDs 2. This type of optical viewer allows an operator to view the light emitted by a particular LED in the array 2 without being distracted by other sources of light.
  • the carriage In order to calibrate the array of LEDs 2, the carriage is aligned with the first LED in the array 2. This is supplied a preset signal by a controller 8.
  • the preset signal is associated with a desired wavelength and/or intensity of light. Typically, the preset signal will be associated with full brightness, white light (i.e. the red, green and blue components of the preset signal are all at a maximum value), or simply full brightness, red, green or blue light. It should be noted that before calibration there will be no compensation factor stored in memory 3 for the first (or any other) LED and so no adjustment to the preset signal will initially be made.
  • the first LED will emit light as a result of the application of the preset signal. However, this light is unlikely to actually be at the desired wavelength and/or intensity. A skilled operator is able to detect this by viewing the first LED through the optical viewer 7.
  • the operator can adjust the red, green and blue components of the light until the wavelength and/or intensity of light emitted equal the desired values.
  • This adjustment is made by a three-axis joystick 9. Each axis is used to adjust preset signal so as to control a respective one of the red, green and blue components of the emitted light.
  • the controller 8 detects the movement of the joystick 9 and adjusts the preset signal accordingly, thereby affecting the wavelength and/or intensity of the light emitted by the first LED in the array 2. When the light is at the desired wavelength and/or intensity then this is indicated to the controller 8 by the user by pressing button 10.
  • the joystick may be used to decrease the red content alone (i.e. leaving the green and blue content unaffected). If, on the other hand it is relatively too bright then the joystick may be used to reduce the red, green and blue contents in unison. Of course, adjustment of both wavelength and intensity could be made.
  • the controller 8 When the desired wavelength and/or intensity have been achieved and button 10 has been pressed to indicate this then the controller 8 writes an appropriate compensation factor to memory 3 for the first LED.
  • This compensation factor is typically calculated to be the ratio between the preset signal after it has been adjusted by the operator and the initial preset signal. This means that if the preset signal has red, green and blue components then the compensation factor will have a component for each of the red, green and blue components of the preset signal, each component of the compensation factor effectively acting as a scaling factor for future signals to be applied to the LED.
  • the different components of the compensation factor may have different values to allow relative variation of the red, green and blue components.
  • the carriage 5 is then moved along rail 6 to align the optical viewer 7 with the next LED in the array 2 and the calibration process is repeated. This is done for each of the other LEDs in the array 2.
  • the controller 8 may calibrate each LED with more than one preset signal, for example at full brightness, half brightness and possibly other levels of brightness, and/or with white, red, green and blue light. This ensures the calibration is uniform across the entire output range of the LED. The calibration process is effectively the same, simply being repeated for the second and any subsequent preset signals. However, it is necessary for the controller 8 to write the compensation factor along with the desired wavelength and/or intensity to memory 3 for each of the preset signals so that the correct compensation factor can be applied for a given wavelength in future.
  • Figure 2 shows an enhancement to the embodiment of Figure 1 to allow for an automatic process of calibration more suited to high-volume manufacturing. Where the same reference numerals are used in Figure 2 as in Figure 1 these refer to the same parts and the description of these will not be repeated.
  • the system shown in Figure 2 comprises a colorimetric photometer 11 attached to the optical viewer 7. This detects the light produced by an LED in the array 2 and produces output signals indicating the wavelength and/or intensity of the light. These output signals are supplied to the controller 8.
  • stepper motor 12 mounted on the carriage 5, and a stepper motor controller 13 attached to the controller 8.
  • the motor 12 is coupled to a pinion gear 14 which meshes with a rack gear 15 mounted on the rail 6 through a hole in the carriage 5.
  • the stepper motor controller 13 causes the stepper motor 12 to be actuated in response to commands from the controller 8. Actuation of the stepper motor 12 causes the carriage 5, and hence the photometer 11 , to move along the rail 6. By driving the stepper motor 12 through an appropriate number of pulses, the photometer 11 can be brought into alignment with any of the LEDs in the array 2.
  • the joystick 9 and button 10 are still provided in case it is required to manually override the automatic process. This ensures that if the software is unable to calibrate an LED correctly, a human operator can intervene. If the operator is able to successfully calibrate the LED then this prevents the PCB having to be reworked, which is a costly process.
  • the controller 8 causes the stepper motor controller 13 to actuate the stepper motor 12 so that the photometer 11 is brought into alignment with the first LED in the array 2.
  • the preset signal is then applied to the first LED causing it to emit light.
  • the wavelength and/or intensity are measured by the photometer 11 , the output signals of which are supplied to the controller 8.
  • the controller 8 then adjusts the preset signal appropriately to cause the light emitted by the first LED to be at the desired wavelength and/or intensity.
  • controller 8 writes an appropriate compensation factor to memory 3 for the first LED. This compensation factor is typically calculated to be the ratio between the preset signal after it has been adjusted by the controller 8 and the initial preset signal.
  • the controller 8 then issues a command to the stepper motor controller 13 to cause it to actuate the motor 12 such that the photometer is brought into alignment with the next LED in the array 2 which is then calibrated. This is repeated for all the LEDs in the array 2.
  • the controller 8 may calibrate each LED with more than one preset signal, for example at full brightness and half brightness.
  • the desired value of wavelength and/or intensity may be set by first inserting a reference PCB into the apparatus.
  • This reference PCB will typically be taken from a previously commissioned display in which one of the PCBs has developed a fault.
  • the use of a reference PCB from the display allows the LEDs on the replacement PCB to be matched to the other PCBs in the display which will have aged since original commissioning so that the replacement looks natural and is not glaringly apparent.
  • the stepper motor controller 13 will then cause the stepper motor 12 to move the carriage 5 so that the optical viewer 7 and photometer 11 are brought into alignment with each of the LEDs in the reference PCB in turn.
  • the controller 8 causes the preset signal is applied to the respective LED and the output signals from the photometer 11 are measured and stored in a memory in controller 8.
  • the PCB 1 to be calibrated is then inserted and the calibration procedure described above is carried out.
  • the desired value is set based on the measured values of wavelength and/or intensity taken from the reference PCB.
  • the desired value of the wavelength and/or intensity for each LED in the PCB 1 to be calibrated may be set to be equal to the average of the measured wavelength and/or intensity values of all the LEDs on the reference PCB.
  • Either of the embodiments described may be simply adapted for use with arrays of LEDs on the PCBs extend in two directions (i.e. they form a dot matrix).
  • the carriage 5 can be modified to be movable in each of the two directions so that it can be positioned over any one of the LEDs (or other types of light source) forming the dot matrix.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un procédé d'étalonnage de réseau de sources lumineuses. Le procédé se compose des étapes suivantes : a) l'acheminement d'un signal prédéfini à une première source lumineuse du réseau, ce signal étant associé à une valeur souhaitée de la longueur d'onde et/ou de l'intensité lumineuse émise par la première source lumineuse ; b) le contrôle de la longueur d'onde et/ou de l'intensité de la lumière émise par la première source lumineuse ; c) la détermination d'un facteur de compensation à appliquer au signal prédéfini de sorte que la longueur d'onde contrôlée et/ou l'intensité aient la valeur souhaitée ; d) l'enregistrement du facteur de compensation et e) la réalisation des étapes (a) à (d) pour chaque autre source lumineuse du réseau. Un appareil correspondant est également présenté.
PCT/GB2008/001635 2007-05-10 2008-05-09 Procédé et appareil d'étalonnage Ceased WO2008139174A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0709041.8A GB0709041D0 (en) 2007-05-10 2007-05-10 Calibration method and apparatus
GB0709041.8 2007-05-10

Publications (1)

Publication Number Publication Date
WO2008139174A1 true WO2008139174A1 (fr) 2008-11-20

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Application Number Title Priority Date Filing Date
PCT/GB2008/001635 Ceased WO2008139174A1 (fr) 2007-05-10 2008-05-09 Procédé et appareil d'étalonnage

Country Status (3)

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GB (1) GB0709041D0 (fr)
TW (1) TW200905639A (fr)
WO (1) WO2008139174A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009120325A1 (fr) * 2008-03-28 2009-10-01 Cree, Inc. Appareil et procédés permettant de combiner des émetteurs de lumière
US8152337B2 (en) 2009-05-01 2012-04-10 Billboard Video, Inc. Electronic display panel
CN115494003A (zh) * 2022-10-09 2022-12-20 马鞍山市桓泰环保设备有限公司 一种污水多监测因子在线监测系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024584A1 (fr) * 1999-09-29 2001-04-05 Color Kinetics, Inc. Systemes et procedes d'etalonnage de la lumiere emise par des diodes lumineuses
US20040021859A1 (en) * 2002-08-01 2004-02-05 Cunningham David W. Method for controlling the luminous flux spectrum of a lighting fixture
US20060049332A1 (en) * 2004-09-08 2006-03-09 Vornsand Steven J Method of adjusting multiple light sources to compensate for variation in light output that occurs with time
US20060186819A1 (en) * 2005-02-23 2006-08-24 Dialight Corporation LED assembly, and a process for manufacturing the LED assembly
US20070034775A1 (en) * 2005-08-15 2007-02-15 Cheng Heng Y Calibrated LED light module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024584A1 (fr) * 1999-09-29 2001-04-05 Color Kinetics, Inc. Systemes et procedes d'etalonnage de la lumiere emise par des diodes lumineuses
US20040021859A1 (en) * 2002-08-01 2004-02-05 Cunningham David W. Method for controlling the luminous flux spectrum of a lighting fixture
US20060049332A1 (en) * 2004-09-08 2006-03-09 Vornsand Steven J Method of adjusting multiple light sources to compensate for variation in light output that occurs with time
US20060186819A1 (en) * 2005-02-23 2006-08-24 Dialight Corporation LED assembly, and a process for manufacturing the LED assembly
US20070034775A1 (en) * 2005-08-15 2007-02-15 Cheng Heng Y Calibrated LED light module

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009120325A1 (fr) * 2008-03-28 2009-10-01 Cree, Inc. Appareil et procédés permettant de combiner des émetteurs de lumière
US8350461B2 (en) 2008-03-28 2013-01-08 Cree, Inc. Apparatus and methods for combining light emitters
US8513871B2 (en) 2008-03-28 2013-08-20 Cree, Inc. Apparatus and methods for combining light emitters
US8152337B2 (en) 2009-05-01 2012-04-10 Billboard Video, Inc. Electronic display panel
CN115494003A (zh) * 2022-10-09 2022-12-20 马鞍山市桓泰环保设备有限公司 一种污水多监测因子在线监测系统

Also Published As

Publication number Publication date
GB0709041D0 (en) 2007-06-20
TW200905639A (en) 2009-02-01

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