WO2003100448A1 - Controle de reseau - Google Patents

Controle de reseau Download PDF

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Publication number
WO2003100448A1
WO2003100448A1 PCT/AU2003/000649 AU0300649W WO03100448A1 WO 2003100448 A1 WO2003100448 A1 WO 2003100448A1 AU 0300649 W AU0300649 W AU 0300649W WO 03100448 A1 WO03100448 A1 WO 03100448A1
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WO
WIPO (PCT)
Prior art keywords
components
led
array
monitoring
row
Prior art date
Application number
PCT/AU2003/000649
Other languages
English (en)
Inventor
Zhi-Qiang He
Original Assignee
Compusign Pty 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 Compusign Pty Ltd filed Critical Compusign Pty Ltd
Priority to AU2003229382A priority Critical patent/AU2003229382B2/en
Publication of WO2003100448A1 publication Critical patent/WO2003100448A1/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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/21—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel
    • H05B47/22—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel with communication between the lamps and a central unit
    • 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
    • G09G2330/10—Dealing with defective pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

Definitions

  • the present invention relates to the monitoring of arrays of components, and relates especially to arrays of light emitting diodes (LEDs), although it may be applied more broadly also.
  • LEDs light emitting diodes
  • LEDs are able to provide high illumination, whilst exhibiting low power consumption and long life. They may be mounted together in arrays and may be addressed individually so as to provide different patterns of illumination.
  • LED arrays are therefore well-suited for use in illuminated signs and other display contexts, especially where the information to be displayed is changed or updated regularly. Accordingly, LED array displays are in widespread use, and are found in many different forms and environments, both indoors and outdoors.
  • LED displays include ticker and moving message display boards and the like. These may be mounted throughout a building or other area, and may for example provide finance, news and sports information, as well as promotional and advertising messages.
  • LED displays may also be found in airports and bus and train stations, where they may be used to display travel information and the like to passengers.
  • LED displays Another increasingly important use of LED displays is in traffic signalling.
  • a LED sign on a freeway might indicate a warning, route information, traffic conditions, speed limits and the like.
  • the LEDs of an LED array are connected together in a row and column arrangement, and row and column drivers activate the appropriate LEDs of the array to produce a desired graphic or the like.
  • the row driver will sequentially connect each row of LEDs to ground, and the column drivers will apply a voltage simultaneously to selected ones of the LEDs in the activated row in order to generate the necessary graphic or image to be displayed.
  • the present invention aims to provide an LED display and the like with extra functionality that may provide various beneficial features to the display.
  • the present invention provides an LED device (such as a display or illumination device) having an array of LED components, the device including circuitry for illuminating the LED components and circuitry for monitoring the current drawn by individual LED components or groups of LED components within the array.
  • a display or illumination device having an array of LED components, the device including circuitry for illuminating the LED components and circuitry for monitoring the current drawn by individual LED components or groups of LED components within the array.
  • the present invention may provide a number of advantages. For example, the present invention enables one to determine if one or more of the LED components are defective, so that suitable remedial action may be taken.
  • the invention can be particularly useful in safety critical situations, such as in traffic road sign applications and the like.
  • a damaged LED display could prevent a vehicle driver from receiving important information and/or could cause a driver to receive wrong information.
  • a LED traffic sign may be monitored, e.g. from a remote central control, and any problems with the sign may be immediately identified and rectified. Further, as well as providing an alert for remedial action, the present invention may allow the condition of the device to be monitored over time. Thus, a log may be kept of the state of the LED components in the array.
  • a vehicle driver charged with a speeding offence might try to argue that the LED sign displaying the speed limit was defective, and that the sign was either unintelligible or gave an incorrect speed. With current displays, this argument could be very difficult to disprove.
  • a log may be kept of the condition of the array LEDs, and this may be suitably recorded (e.g. in a tamper-proof manner) so that the log may be used in court or the like in order to prove that the sign was working correctly.
  • Such evidence may also be used to limit liabilities that could arise from a suggestion that defective signage had caused an accident or the like.
  • the LED components of the array may take any appropriate form, and could be individual LEDs and/or could be clusters of LEDs, e.g. two or more LEDs addressable together as a single unit/pixel.
  • the LEDs of any array and/or cluster may be all of the same type, or could be of differing types, e.g. have different colours, operating intensities or the like.
  • groups of LED components within a row may need to be tested together, as opposed to individually, e.g. a specific sub-unit of the LED components that provide a group of pixels on a display.
  • the monitoring circuitry may take any suitable form, and may include separate sensors for monitoring each of the individual LED components. This could however result in a quite complicated and expensive design.
  • the monitoring circuitry includes a monitoring sensor for monitoring each row of LED components in the array (one sensor could be common to all rows, or a separate sensor could be provided for each row). This then reduces the number of sensors required, and provides for a less complex and expensive display.
  • a row sensor may determine the current on a row line during illumination of one or more of the LED components of that line. If this is carried out whilst e.g. a sign is operating in its standard illumination mode, then it will generally be the case that more than one LED component in a row will be lit simultaneously. Therefore, although monitoring of the row current would provide an indication of a problem with those of the LEDs that are meant to be lit, it would not identify the individual LED or LEDs at fault.
  • the LED device may operate in both an illumination mode and in a test mode, wherein in the test mode only one LED component (or one group of LED components) at a time is lit on a row. This then allows each LED component (or group of components) to be monitored independently.
  • the LED components in the array may be switched on and off at a rapid rate, and that sensing can also occur relatively rapidly. Therefore, even though a LED component under test will be illuminated, it will not significantly affect the appearance of e.g. a displayed image or illumination effect, since it will be a short isolated illumination that need not be continually repeated, and so will not be registered by an observer.
  • test may take place relatively quickly, it may occur at any suitable time within the normal operation of the display, e.g. interlaced between the normal illumination controls.
  • a LED display is normally run in a pulsed mode, so that a graphic is actually flashed e.g. 25 times a second rather than constantly illuminated. This still gives the impression of a constant image (due to "persistence of image" of the human eye), whilst reducing the load on the LED components and increasing their working life and the like.
  • It also allows fewer column drivers to be used, as the rows may be scanned so that a column driver may independently activate LED components in more than one row.
  • a test mode may be conducted between a pair of such illumination flashes. Alternatively or also, a test may occur after only one row has been lit, and/or one row may be tested whilst another row is in the illumination mode.
  • the display sign may be operated so that only one LED component in a row (or only a specific group of LED elements in a row) is switched on at any one time.
  • the current sensing may then take place during a normal illumination mode. In this case, even where the LED components are individually switched or switched in small groups, the speed of switching may still provide a seemingly constant display.
  • the row sensor may take any suitable form, and may for example take the form of a resistive element, whose voltage drop is monitored.
  • the resistive element may be placed for example between the LED components of a row of the array and a common ground. The voltage drop will provide an indication of the current drawn by the LED components, and so will provide an indication of the state of the LED components.
  • a sensor resistance on a row line may cause problems when operating in a standard illumination mode in which a number of LED components on a row are simultaneously lit. For example, if the resistance is too high, then when e.g. all of the LED components in a row are illuminated at the same time, the total current drawn by all of these LED components will pass through the sensor resistance, and this could result in an unacceptably high voltage drop and possible damage to the device circuitry. If the sensor resistance is reduced to minimise the voltage drop, however, then there may be insufficient resistance to derive a meaningful voltage from it, and this may lead to inaccuracies in the monitoring.
  • the number of activated LED components within a row will vary depending on the different images being displayed, then the presence of the sensor resistance within the row will cause the current through the LED components to vary with the number of LED components illuminated. This will vary the brightness of the LED components, dependent upon the image displayed (i.e. the number of LED components lit), and so could be detrimental to the appearance of the displayed image.
  • These effects may not be problematic for displays using only a small number of LED components per row, and, in one embodiment, the problems may be overcome by operating the device so that when e.g. generating a graphic or the like only one LED component per row is illuminated at a time or so that only a small number of LED components are operated at a time. In the latter case, a test mode, as well as a standard illumination mode, may be required to test the LED components individually or in still smaller groups.
  • the monitoring circuitry includes sensing circuitry that can be switched into and out of the array circuitry (LED illuminating circuit).
  • sensing circuitry that can be switched into and out of the array circuitry (LED illuminating circuit).
  • LED illuminating circuit This allows the display to be illuminated in a standard manner by activating multiple LED components per row simultaneously (with the sensing circuitry switched out of the array circuitry), and allows the LED components to be tested by switching the sensing circuitry into the array circuitry when a test is to be conducted.
  • a sensor circuit may thus be provided in each row of the array, and the sensor circuit may be switched out of the row circuit when the LED components of that row are being operated to produce a graphic or the like, e.g. when a row is activated by the row driver. Then, when the row driver deactivates the row (disconnects it from ground), the sensor circuit may be switched into the row circuit and one or more of the LED components may be pulsed by the channel driver for testing purposes.
  • testing may take place at any time, due to the speed with which switching is able to occur.
  • the sensing circuitry may include a suitable monitoring sensor such as a resistive element whose voltage is monitored.
  • the sensor may be positioned between the LED components of the row and a common sink such as ground.
  • Each row may be provided with its own sensor, or a plurality of rows may be connected to a common sensor.
  • the sensing circuitry may be in series with the row switches, or may be parallel with them (e.g. providing a parallel route to ground).
  • the switching circuitry could take the form of various input/output ports of a controlling microprocessor. These could be operated to present a voltage level to one side of the row sensor which is equal to that presented at the other side by the column driver (through the LED components). This then prevents current flow along this route, and may provide an inexpensive and simple implementation of the invention needing few extra components.
  • the row sensor and test switch I/O port would be in series with one another.
  • This implementation may not identify a fault with the row switch or row driver circuitry, as it provides a parallel circuit to ground independent of the row switch. Where the row and test switches are in series, then a fault in the row switch will be picked up in the test. It may not however be possible to use the implementation of the I/O ports. Instead, the switching may be provided by for example a transistor component, such as a MOS-FET transistor, e.g. as used by the row drivers of standard LED displays for turning the rows on and off.
  • a transistor component such as a MOS-FET transistor
  • the switch and row sensor are arranged parallel to one another, with closure of the switch providing a bypass to the sensor during normal illumination.
  • a transistor component may be provided on each row for switching a parallel resistive element into and out of circuit with the LED components of the row.
  • a transistor component may also be used in the parallel switch arrangement in place of the I/O ports of the microcontroller. Actuation of such sensor circuit switches may be achieved by using a driver circuit similar to a row or column driver circuit,
  • test, row and driver circuits may all be co-ordinated using a microcontroller within the LED device suitably programmed to provide the desired functionality.
  • the microcontroller may receive the outputs from the current sensing circuits, and use the information as appropriate.
  • the sensing circuitry may take any suitable form, and e.g. any suitable means may be provided for monitoring the voltage across the resistive element.
  • the voltage could be passed to one or more suitable comparators or the like, which could output a signal dependent on whether the voltage was above or below a set threshold value or values, the threshold value indicating a short circuit, a lower than expected or higher than expected current or the like.
  • the voltage across the row sensor/resistive element is monitored by an analogue to digital (A/D) converter that outputs a signal proportional to the voltage across the sensor.
  • A/D analogue to digital
  • the A/D converter may have any suitable accuracy, and may be an 8-bit converter that outputs a voltage value between 0-255. Higher bit converters could also be used if greater accuracy were required, e.g. 9 or 10 bit converters.
  • the applied voltage and preferably also its pulse length, are the same as that used in a normal illumination mode. They could however be different, and where the sensor is switchable into or out of circuit with the row circuitry, it would also be possible, for example, to provide a number of different sensor elements in the test mode, e.g. having different resistive values. Thus, the sensor could be changed, depending on e.g. the types of LED components used in the array.
  • the results obtained from the monitoring circuits for the LED components may be utilised in any suitable manner, and may be stored and/or operated on by means within the LED device itself, e.g. a microprocessor, and/or may be passed to a central control with which the device communicates.
  • the results may for example be analysed or logged or both.
  • the detected voltage may be compared to one or more threshold values to determine whether the LED component is faulty or not.
  • the actual current passing through the LED component may be determined (e.g. as a value between 0-255 for an 8-bit A/D converter), and this value may be used to determine if there is an open or a short circuit or if an incorrect LED type has been placed in the array.
  • the current drawn by the cluster may be monitored to check if one or more of its LEDs has become defect.
  • the system will not generally be able to detect which LEDs of a cluster are faulty, only that one or more of them are, due to the change in the current drawn.
  • a more detailed analysis may also be undertaken by correlating the results for the different LED components monitored, e.g. in order to identify other problems that may exist in the display. For example, if only one LED component on a column is found defective, then the LED component itself is probably faulty. However, if all of the LED components of one array column are determined to be faulty, then it may be that the fault is with the column driver rather than with the LED components themselves. Other problems may also be detected, such as power supply or temperature faults or the like.
  • the monitored information may be logged for future use.
  • the device or system may thus record the time and date at which a test was run together with the resulting test data obtained. Recording may be done in such a manner that the record is tamperproof. This may then provide the record with an evidentiary quality.
  • the monitoring circuitry may monitor all of the LED components of an array. Alternatively or additionally, the monitoring circuitry may only test those LED components of the array that are intended to be illuminated, e.g. that need to be activated in order to generate a particular image that a display is instructed to produce. This latter embodiment satisfies the need to ensure that the LED device is working correctly, e.g. is displaying the correct information, without the need to test all of the LED components and without the need to store the resulting data for all of the LED components. It can therefore provide savings in communications bandwidth, and, more importantly, can provide savings in storage space where a log of the test results is kept.
  • any suitable action may be taken. For example, an alarm may be raised, an engineer may be sent to repair the faulty device (possibly already knowing what is wrong from a remote diagnostics of the device), the device may be instructed to shut down or to output a failure warning or the like, e.g. a default signal, or the required graphics or the like that are to be generated could be produced using alternative LED components of the array, e.g. the image could be shifted one or more pixels (LED components) either side, or above or below, a faulty pixel or could be reshaped. Also, it would be possible to include back-up LED components for each of the pixels of the array, which could be switched into place on failure of any of the main LED components.
  • a LED component comprises a cluster
  • the invention may also relate to illumination devices, especially those used in safety critical applications.
  • the present invention provides an LED device including an array of LED components, means for monitoring a condition of the separate LED components or of groups of the LED components, and means for logging the monitored conditions.
  • a further feature that is important in itself, is the monitoring of only those LED components of a device that are to be illuminated.
  • the present invention provides an LED device including an array of LED components, means for determining which of the LED components are required to be illuminated, and means for monitoring the condition of the LED components that are required to be illuminated.
  • the present invention provides an LED device including an array of LED components, means for operating the LED components in an illumination mode (in which the LED components may be operated simultaneously), and means for operating the LED components in a test mode in which the LED components (or groups thereof) of any one row or column of the array are illuminated individually.
  • the present invention provides an LED device including an array of LED components, means for illuminating the LED components, and means for monitoring the condition of the LED components, wherein the means for monitoring the LED components includes means for switching a sensor into each row or column of the array for testing purposes.
  • the present invention provides an
  • LED device e.g. display or illumination
  • a central control and one or more remote LED array devices, e.g. display or illumination devices, each LED array device including an array of LED components, means for receiving illumination instructions from the central control, means for illuminating the LED components of the array in accordance with the illumination instructions, means for testing the condition of the LED components, and means for communicating information to the central control relating to the results of the test.
  • the present invention provides an LED device control system including one or more LED devices, each having an array of LED components, and a remote central control for controlling the one or more devices, wherein each device includes means for detecting a condition of the array components, and means for sending information to the central control relating to the detected conditions.
  • the present invention also extends to LED devices for use in such systems, and the systems and devices may include any of the above-mentioned features, including for example alarm, analysing and/or logging features.
  • the present invention also extends to methods of operating LED devices and LED device systems in accordance with any of the previously discussed features.
  • LED devices and systems in accordance with the present invention may be utilised in many different applications, e.g. traffic signs, traffic lights, airport landing lights, transport applications generally, such as in rail and bus stations and the like, hospital signage, manufacturing, logistics stock control, advertising and promotional signage and information systems in general. They may also be used in e.g. machinery and instrumentation situations, e.g. for lighting or indicating purposes or the like.
  • the present invention may also extend to non-LED displays and other non-LED applications.
  • the invention is applicable to electronically controlled arrays in general, especially low-voltage electronic arrays.
  • it may be applicable to signs using electro-mechanical elements or incandescent globes, lighting arrays using any suitable lighting elements, and non-lighting and display situations, such as arrays of solenoid activated devices or the like.
  • the present invention provides an electronically-activated array including a plurality of components connected together in a row and column formation to form the array, the components being actuated by an electrical current supplied by one or more array drivers, and wherein the array includes a monitoring circuit for monitoring the current drawn by individual components or groups of components.
  • the monitoring circuit includes a current sensor in each row or column of the array, and preferably, the monitoring circuit is switchable into and out of a row or column circuit, the monitoring circuit being switched out of the row or column circuit when the row or column is under test.
  • the actual implementation of the invention may take any suitable form, and may use hardware, firmware and/or software as desired.
  • the monitoring circuitry may be provided in any suitable manner, and may lie totally or partially within the controlling microprocessor.
  • the values of the various components, e.g. resistances and the like many take any suitable form depending on the circumstances.
  • Figure 1 is a schematic of a standard LED display control circuit
  • Figure 2 is a schematic of an LED display control circuit in accordance with a first embodiment of the present invention
  • Figure 3 is a schematic of an LED display control circuit in accordance with a second embodiment of the present invention.
  • Figure 4 is a schematic of an LED display control circuit in accordance with a third embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of an LED display system in accordance with an embodiment of the present invention that might be used e.g. to provide traffic control signs and the like.
  • a standard LED display 1 typically comprises a plurality of LEDs 2 that are individually addressable so that any number of the LEDs 2 may be illuminated in order to provide a desired image on the display 1.
  • the LEDs 2 are connected together into an array of n rows (Row Row n ) and m columns (C ⁇ -C m ), and are controlled by a microcontroller 3.
  • the microcontroller 3 has in-built into it or controls a row driver 4 (represented by switches DSrDS n ), and also controls a column driver 5. These drivers 4,5 activate the LEDs 2.
  • one of the row switches DSrDS n is closed to connect all of the LEDs 2 of the corresponding row Row Row n to a common ground.
  • the column driver 5 provides a voltage on a select number of the columns CrC m , so that a current will flow through the LEDs 2 of those columns.
  • the row driver 4 provides a sink for one row of the LEDs 2 at a time, and the column driver 5 simultaneously illuminates those LEDs 2 on the grounded row which the microcontroller 3 has determined need to be lit in order to provide the required sign graphic or the like.
  • the microprocessor 3 cycles through each row Row Row n in turn, illuminating the required LEDs 2 of each row. Typically, all of the rows are cycled through once every 25 th of a second, so that the image seen is flashed on the display e.g. at 25 frames per second. Due to persistency of vision, an observer of the display will see a seemingly constant image.
  • the LEDs 2 will always be operated at the same brightness level. Their brightness may however be controlled, if desired, by varying the current size and/or the pulse time for the current, thereby altering the average current through the LEDs 2.
  • a desired duty cycle may therefore be employed to provide a desired brightness, e.g. by varying the pulse widths and/or their frequency, whilst working within suitable limits for the device.
  • LEDs are rated at an average maximum current of 10-20 mA. They can be driven harder, but this tends to reduce their working life, and generally LEDs should be driven at less than their maximum rating.
  • the LED display 1 may be configured with any number of rows. However, in practice, there is a limit due to the available driver current and the duty cycle. Some displays may use only one row, in which case no row driver 4 is required, and the row is permanently grounded. Typically, a display will use two to four rows (or more) that are arranged in a serpentine manner along the length of a display. Thus, when four array rows are used in a display, the first, fifth and ninth pixel rows as seen by a user of the display will comprise a single continuous row of the actual LED array.
  • the addressable pixels of the LED array may comprise merely a single
  • each pixel comprises more than one LED, e.g. LEDs 2a and 2b.
  • the LEDs 2a,2b thus form a cluster of LEDs that are not individually addressable, but are lit together.
  • LEDs 2a,2b are shown in parallel, the LEDs of a cluster could be in series, in parallel or both.
  • the microcontroller 3 controls all of the functions within the LED display
  • an LED display in accordance with the present invention is similar to that of Fig. 1 , but further includes monitoring circuitry 6 for determining the condition of the various LEDs 2.
  • Monitoring circuitry 6 includes a sensor 7 (a resistive element) in each of the row lines RowrRow n . These sensors 7 are located between the LEDs 2 of a row and their common ground so as to provide a parallel circuit to ground with the row switches RowrRow n .
  • the monitoring circuitry 6 also includes an analogue to digital (A/D) converter 8 for each row Row Row n to monitor the voltage across the associated sensor 7.
  • A/D analogue to digital
  • the monitoring circuitry 6 further includes a switch TS ⁇ -TS n for each row sensor 7 to switch the sensor 7 into and out of the row circuitry.
  • These sensor switches TS- ⁇ -TS n may take the form of e.g. MOS-FET transistors, and are activated by the microcontroller 3 in a similar manner to the row sink switches DSrDS n .
  • the switches TSrTS n may take the form of input/output ports of the microprocessor 3. These ports would then be raised to a high level to effectively switch the sensor 7 out of the row circuitry, and placed in a low level condition to switch the sensor 7 into the row circuitry.
  • the microcontroller 3 can thus operate any of the rows of the LED array in either an illumination mode or in a test mode. In the illumination mode, the microprocessor 3 closes the sink switch
  • DSi-DS n for a row, opens the sensor switch TS TS n for that row, and activates the column driver 5 to apply a voltage to those LEDs 2 of the row which need to be illuminated to provide a desired display element.
  • This mode is therefore similar to a standard LCD display illumination control, and the rows of the array may be operated so as to provide e.g. a 25 frames per second (or more) display rate that will appear constant to an observer.
  • the row sink-switch DS ⁇ -DS n is opened and the row sensor switch TSrTS n is closed. This effectively places the row sensor 7 (resistance element) into series with the LEDs 2 of the row, between the LEDs 2 and their common sink, e.g. ground, and allows the current flowing through the LEDs 2 of the row to be monitored through the voltage across the sensor resistor 7, as monitored by the A/D converters 8.
  • the row sensor 7 resistance element
  • the sensors 7 may e.g. have a resistance of 50 ohms or greater. For example, assuming that a current of about 20 mA is drawn, then a sensor with a 100 ohm resistance will provide a voltage drop of about 2V, which can be effectively monitored by the A/D converters 8.
  • the microcontroller 3 may instruct the column driver 5 to activate the LEDs 2 one at a time, so that the current drawn by each LED 2 (or cluster of LEDs 2a,2b) may be individually monitored. It may also operate the LED components in groups, each group being operated one at a time.
  • the test mode may be carried out on a row at any time that that row is not in the illumination mode. Where the display is flashed, e.g. 25 times per second, the test mode may be activated between each flashed frame or any pair of them. The LEDs 2 may however be tested at any suitable time, in a random or sequential manner, and one row could be tested whilst another is in the illumination mode.
  • the microcontroller 3 receives the information from the A/D converters 8, and may use it as desired. Thus, it may simply pass the information to a central control, may analyse the data and send the results of the analysis to a central control, and/or may act on the data itself.
  • the data may be analysed to determine whether a fault condition exists, e.g. because the monitored current has deviated from a set point value, e.g. due to an open or short circuit or the like caused by a LED. A change in current would also occur for example when one or more LEDs of a LED cluster where faulty. Fault results from a number of the individual LED components (or groups of LED components) tested may be correlated to check for other faults, e.g. in the row or column drivers, the power supply or the like. Also or alternatively, the results of the monitoring may be stored in a memory 9 of the display device or may be passed to the central control for storage. The invention can thus keep a log of the statuses of the LEDs 2.
  • the log may record actual currents drawn by the LEDs 2 or merely that a LED was determined to be working correctly or not.
  • the latter uses less storage space, as the status may be recorded as a "1" or a "0" bit, whilst the former may provide more information as to the fault.
  • the test mode may be made in relation to all of the LEDs 2, or only in relation to the LEDs 2 that are required to be illuminated to generate a desired sign.
  • the information obtained is still enough to show that a display is or was displaying the correct sign to e.g. a vehicle driver, whilst reducing the amount of space required to store or transmit the data.
  • a display is or was displaying the correct sign to e.g. a vehicle driver
  • reducing the amount of space required to store or transmit the data This assumes that only those LED components required to be illuminated are in fact illuminated (e.g. none are illuminated because of a defective driver or the like).
  • an unwanted LED component is illuminated, then this may be picked up in the standard test mode (i.e. when detecting whether the desired LED components are illuminated), e.g. through an unexpected current value in a row circuit including the unwanted LED illumination. This may however not always be possible e.g. due to a lack of sensitivity of a monitoring circuit. In this case, a further test for unwanted LED component illuminations may be required. This may be implemented by testing for illuminated LED components (i.e. current flow through the sensors 7), whilst activating none of the LED components, e.g. by setting all of the column driver outputs low.
  • Fig. 3 shows a second embodiment of the present invention, which is similar to that of the first embodiment of Fig. 2, but provides the test switches TSrTS n so that they are in series with the row switches Row Row n . This then requires the sensors 7 to be in parallel with the test switches TS TS n .
  • Fig. 3 works in the same manner as the embodiment of Fig. 2, except that when a row is to be tested, the test switch TSrTS n is open and the row switch RowrRow n is closed, whilst when a row is in an illumination mode, then both the test switch TSrTS n and the row switch Row Row n are closed.
  • This embodiment has the advantage that it can record a fault if a row switch or the row driver is faulty, whilst this may not be possible in the parallel configuration of Fig. 2.
  • the device 1 may be used in a stand-alone manner. Alternatively, it may form part of a larger system in which e.g. a number of such displays communicate with a central control.
  • Fig. 4 shows a third embodiment of the present invention, which is similar to the second embodiment of Fig. 3, but in which the monitoring circuitry 6 has been reduced to the use of only a single monitoring sensor 7, switch TS1 and A/D converter 8. If switch TS1 is open, then the sensor 7 is switched into the array circuitry, and the current can be monitored for whichever of the rows has its row switch DSrDS n closed. A similar modification can be carried out in respect of the first embodiment of Fig. 2, so that only one sensor 7, switch TSi, and A/D converter need be used.
  • Fig. 5 shows an overall LED display system 10 in which a number of LED displays 1 are connected to a central control 11.
  • Each LED display 1 includes an array of LEDs 2 and a microcontroller 3 that communicate with and receives instruction from a central control 11 including suitable processing means 12 and memory means 13.
  • the central control 11 will instruct a display 1 as to an image to display, and the microcontroller 3 will activate the appropriate LEDs 2 accordingly.
  • the microcontrollers 3 will also monitor the condition of the various LEDs 2, and will forward the results to the central control 11 , which will then process the results and store them in the memory means 13.
  • the central control 13 may take any suitable action. For example, it may dispatch a repair team to fix the display, it may disable the display, it may instruct the display to display a default sign, or it may attempt to alter the sign to be displayed, so that it may still be displayed without using the faulty LEDs 2, e.g. by shifting the graphic or the like a pixel to the side, or by activating adjacent pixels or the like.
  • Communication between the displays 1 and central control 11 may take place in any suitable manner, and the central control 11 may poll the displays 1 , or the displays 1 may communicate at set times or when a notifiable event occurs, such as a failure.
  • the results of the monitoring may be stored in the individual displays 1 , or may be stored in the central memory 13 within the central control 11.
  • the results may be used in any suitable manner.
  • the LED displays and system discussed above could be used in many different situations, and could take many different forms.
  • the displays 1 could be ticker or moving message displays in a building or other area, and could be controlled and monitored by a central control 11 that sends message information to each. It is especially applicable to road signs and the like, where the correct display of information is critical to safety.
  • the LEDs 2 may also provide illumination, e.g. the lights of a traffic signal.
  • the senor 7 could be permanently connected between the LEDs 2 of a row and their common sink, without needing the test switches, and the LEDs 2 in a row could be operated individually or in small groups in both an illumination mode and/or in a test mode.
  • the invention need not relate only to LEDs, but has wider applications, e.g. in any situation involving a number of low voltage components in an array that must be monitored individually.
  • monitoring sensors in the row circuits it could also use monitoring sensors in the column circuits.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

Un dispositif (1) à réseau de composants activés électroniquement, tels que des LED (2), comprend des montages de circuits d'éclairement des composants (2), par exemple, des commandes de rangées et de colonnes (4, 5), et des montages de circuits de contrôle du courant prélevé par les composants individuels (2) ou un groupe de composants. Les montages de circuits de contrôle comprennent des moyens de détection, par exemple, une ou plusieurs résistances (7) montées en série ou en parallèle avec les circuits de commande et pouvant être mises en/ ou hors circuit, par exemple, au moyen d'interrupteurs (TS1 TSn). Le dispositif (1) peut fonctionner en mode d'éclairement dans lequel les composants (2) sont commandés de façon standard, et en mode essai, dans lequel un ou plusieurs des composants (2) sont commandés, et la tension dans les moyens de détection (7) est réglée, par exemple, au moyen de convertisseurs A/D (8). Les dispositifs (1) peuvent communiquer avec une commande centrale gérant les dispositifs (1) en fonction des résultats du contrôle. Ces résultats peuvent être consignés pour enregistrer l'état du dispositif (1) à un moment donné, par exemple, pour s'assurer que le fonctionnement est correct. Le dispositif (1) peut être utilisé dans bon nombre de situations et peut être, par exemple, un panneau de signalisation ou analogue.
PCT/AU2003/000649 2002-05-28 2003-05-28 Controle de reseau WO2003100448A1 (fr)

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JP2016004800A (ja) * 2014-06-13 2016-01-12 株式会社島津製作所 半導体レーザ装置
WO2019086603A1 (fr) 2017-11-03 2019-05-09 Interna Technologies B.V. Molécule de micro-arn, équivalent, antagomir, ou source de cette molécule pour le traitement et/ou le diagnostic d'une affection et/ou d'une maladie associée à une déficience neuronale ou pour la (ré)génération neuronale
WO2020210521A2 (fr) 2019-04-12 2020-10-15 The Regents Of The University Of California Compositions et procédés d'augmentation de la masse musculaire et du métabolisme oxydatif
WO2024028794A1 (fr) 2022-08-02 2024-02-08 Temple Therapeutics BV Méthodes de traitement de troubles de l'endomètre et de l'hyperprolifération ovarienne

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