Scanning display with short circuit detection function and scanning device thereof

Abstract

A scanning display with short-circuit detection function and a scanning device thereof, comprising: a display device including a common anode structure light emitting diode array and including a plurality of scanning lines and a plurality of data lines; and a scanning device including a plurality of scanning circuits, each of the scanning circuits including a voltage generator and a detector, the voltage generator having an output end electrically connected to a corresponding scanning line of the scanning lines and controlled to generate one of an input voltage and a clamping voltage to the corresponding scanning line, and the detector detecting a voltage of the output end of the voltage generator and generating a detection result indicating whether the corresponding scanning line is abnormal according to the voltage of the output end and a detection timing signal.

Description

TECHNICAL FIELD

[0001] The present application relates to a display and a device, in particular, to a scanning display with short-circuit detection function and a scanning device thereof. BACKGROUND

[0002] The driving mode of the existing light emitting diode (LED) display can improve the ghost phenomenon and coupling problem of the known LED display, but at the same time, other problems such as short-circuit caterpillar phenomenon are also derived. It is further explained that the phenomenon of deriving discharge current caused by the discharge of the parasitic capacitance between the two poles of the LED and then making the corresponding LED emit light is called ghost phenomenon; the low-brightness area of the LED display array is affected by the high-brightness area, resulting in the problem of inconsistent brightness and color displayed by the LED display, which is called coupling problem; the short-circuit caterpillar phenomenon includes the constant-brightness caterpillar phenomenon and the constant-darkness caterpillar phenomenon. The constant-brightness caterpillar phenomenon refers to the constant brightness of a corresponding column of LED light strings caused by the short circuit of one LED in an LED array of an LED display, and the constant-darkness caterpillar phenomenon refers to the constant darkness of the corresponding column of LED light strings caused by the short circuit of the LED. The corresponding column of LED light strings is defined as a plurality of LEDs electrically connected corresponding to a data line of the LED display. In this way, the short-circuit caterpillar phenomenon will affect the display effect of the LED display, therefore, how to eliminate the short-circuit caterpillar phenomenon is a problem that needs to be solved urgently. SUMMARY

[0003] One object of the present application is to provide a scanning display with short-circuit detection function which can overcome the shortcomings of the prior art.

[0004] The scanning display with short-circuit detection function of the present application comprises a display device and a scanning device.

[0005] The display device comprises a common anode architecture light emitting diode array, the light emitting diode array comprises a plurality of scanning lines, a plurality of data lines, and a plurality of light emitting diodes.

[0006] The scanning lines are arranged along a row direction.

[0007] The data lines are arranged vertically along a column direction on the scanning lines.

[0008] The light emitting diodes are arranged in a matrix defined by the scanning lines and the data lines, respectively, each light emitting diode has an anode electrically connected to the corresponding scanning line and a cathode electrically connected to the corresponding data line.

[0009] The scanning device includes a plurality of scanning circuits, each of which includes a voltage generator and a detector.

[0010] The voltage generator has an output terminal electrically connected to a corresponding one of the scan lines, and is controlled to generate one of an input voltage and a clamp voltage to the corresponding scan line at the output terminal.

[0011] The detector receives a detection timing signal, and is electrically connected to the output terminal of the voltage generator to detect the voltage at the output terminal, and generates a detection result indicating whether the corresponding scan line is abnormal based on the voltage at the output terminal and the detection timing signal.

[0012] The scanning display with short-circuit detection function of the present application, in each of the scanning circuits, the detector includes a comparison unit and a logic gate.

[0013] The comparison unit has a first input terminal electrically connected to the output terminal of the voltage generator to receive the voltage at the output terminal, a second input terminal receiving a predetermined reference voltage, and an output terminal providing a comparison result of the voltage at the output terminal and the predetermined reference voltage.

[0014] The logic gate has a first input terminal electrically connected to the comparison unit to receive the comparison result, a second input terminal receiving the detection timing signal, and an output terminal, the logic gate generating the detection result at the output terminal based on the comparison result and the detection timing signal.

[0015] The scanning display with short-circuit detection function of the present application, in each of the scanning circuits, the voltage generator includes,

[0016] A scan switch having a first terminal for receiving the input voltage, and a second terminal electrically connected to the output terminal of the voltage generator, the scan switch being controlled by a scan signal to be conductive or non-conductive, and when conductive, outputting the input voltage to the corresponding scan line,

[0017] A voltage stabilizer for generating the clamp voltage, and

[0018] A clamp switch having a first terminal electrically connected to the voltage stabilizer to receive the clamp voltage, and a second terminal electrically connected to the output terminal of the voltage generator, the clamp switch being controlled by a clamp signal to be conductive or non-conductive, and when conductive, outputting the clamp voltage to the corresponding scan line.

[0019] The scanning display with short-circuit detection function of the present application, the scanning device further includes,

[0020] A controller electrically connected to the detectors of each scanning circuit and the scanning switches and clamp switches of the voltage generator, receives and outputs the detection results from the detectors, and generates and outputs the detection timing signals required by each detector, the scanning signals required by each scanning switch, and the clamp signals required by each clamp switch, the clamp signals varying with the detection results.

[0021] The scanning display with short-circuit detection function of the present application, the number of scanning circuits is N, N is a positive integer, one scanning period of each scanning circuit includes a scanning interval and a clamp interval, when each light-emitting diode electrically connected to the corresponding scanning line of each scanning circuit is not short-circuited, the clamp interval has N-1 first clamp periods, each first clamp period has a delay time and a clamp-on time, in each scanning circuit,

[0022] In the scanning interval, the scanning signal has a conduction level, and the clamp signal has a non-conduction level,

[0023] In the clamp interval, the scanning signal has the non-conduction level,

[0024] In the delay time of each first clamp period, the clamp signal has the non-conduction level, and

[0025] In the clamp-on time of each first clamp period, the clamp signal has the conduction level,

[0026] In the scanning interval, the first first clamp period of the clamp interval, and each clamp-on time of the second to N-1 first clamp periods, the detection timing signal has a non-detection level, and

[0027] In each delay time of the second to N-1 first clamp periods of the clamp interval, the detection timing signal has a detection level.

[0028] The scanning display with short-circuit detection function of the present application, in adjacent two scanning circuits,

[0029] An end point of the conduction level of the scanning signal of the previous scanning circuit corresponds to a starting point of the conduction level of the scanning signal of the next scanning circuit,

[0030] An end point of the first first clamp period of the clamp interval of the previous scanning circuit in the scanning period corresponds to the end point of the conduction level of the scanning signal of the next scanning circuit, and

[0031] The first to (N-1)th first clamp periods of the clamp interval of the former scan circuit correspond to the first to (N-2)th first clamp periods of the next scan circuit respectively.

[0032] The scan display with short circuit detection function of the present application, in each scan circuit, when the detection result indicates that the corresponding scan line is abnormal, the clamp interval has a second clamp period, a third clamp period and a fourth clamp period,

[0033] When the corresponding scan line is abnormal,

[0034] In the scan interval, the scan signal has the on level, and the clamp signal has the off level,

[0035] In the clamp interval, the scan signal has the off level, in the second clamp period and the fourth clamp period, the clamp signal has the off level, and in the third clamp period, the clamp signal has the on level, and the duration of the third clamp period is less than the clamp on time of the first clamp period.

[0036] The scan display with short circuit detection function of the present application, in each scan circuit, the voltage stabilizer is also electrically connected to the detector to receive the detection result, and generates a switching signal according to the detection result, and the voltage generator further comprises,

[0037] The switching switch has a first end electrically connected to the voltage stabilizer to receive the clamp voltage, a second end electrically connected to the first end of the clamp switch, and a control end electrically connected to the voltage stabilizer to receive the switching signal, and the switching switch is controlled by the switching signal to be on or off.

[0038] The scan display with short circuit detection function of the present application, the scan device further comprises,

[0039] The controller is electrically connected to the detector and the voltage generator of each scan circuit, and generates and outputs the detection timing signal required by each detector, the scan signal required by each scan switch, and the clamp signal required by each clamp switch.

[0040] The scan display with short circuit detection function of the present application, the number of scan circuits is N, N is a positive integer, and a scan period of each scan circuit includes a scan interval and a clamp interval, the clamp interval has N-1 first clamp periods, each first clamp period has a delay time and a clamp on time, in each scan circuit,

[0041] In the scan interval, the scan signal has a turn-on level, and the clamp signal has a turn-off level,

[0042] In the clamp interval, the scan signal has the turn-off level, in the delay time of each first clamp period, the clamp signal has the turn-off level, and in the clamp turn-on time of each first clamp period, the clamp signal has the turn-on level,

[0043] In the scan interval, in the first first clamp period of the clamp interval, and in the clamp turn-on time of the second to the N-1th first clamp period, the detection timing signal has a non-detection level,

[0044] In the delay time of the second to the N-1th first clamp period of the clamp interval, the detection timing signal has a detection level, and

[0045] In the scan period, when each light-emitting diode electrically connected to the corresponding scan line electrically connected to the scan circuit is not short-circuited, the switch signal has the turn-on level.

[0046] The short-circuit detection function of the scan display of the present application, in each scan circuit, in the scan period, when the detection result indicates that the corresponding scan line is abnormal, the switch signal is maintained at the turn-on level only in a turn-on time, and the turn-on time corresponds to a part of the clamp turn-on time of the first first clamp period of the clamp interval of the scan circuit indicated by the detection result as abnormal.

[0047] The short-circuit detection function of the scan display of the present application further comprises:

[0048] A data device electrically connected to the data line of the display device and the controller of the scan device, and receiving the detection result from the controller and returning the detection result to the controller, so that the controller adjusts and generates the clamp signal according to the detection result from the data device.

[0049] The short-circuit detection function of the scan display of the present application further comprises:

[0050] A plurality of the display devices, the display devices are electrically connected in a matrix arrangement;

[0051] A plurality of the scan devices, each scan device is electrically connected to the corresponding display device; and

[0052] a plurality of sequentially connected data devices, each data device electrically connected to a corresponding display device, a last data device further electrically connected to a controller of at least one of the scanning devices, a first data device receiving detection results of all the scanning devices and sequentially transmitting the detection results to the controller of the at least one of the scanning devices via a second data device to the last data device.

[0053] The scanning display with short-circuit detection function of the present application further comprises:

[0054] a control device electrically connected to the controller of the scanning device and receiving detection results from the controller and transmitting the detection results back to the controller, so that the controller adjusts and generates the clamp signal according to the detection results from the control device.

[0055] The scanning display with short-circuit detection function of the present application further comprises:

[0056] a data device electrically connected to a data line of the display device and a controller of the scanning device and receiving and outputting the detection results from the controller; and

[0057] a control device electrically connected to the data device to receive the detection results and electrically connected to the controller of the scanning device and transmitting the detection results back to the controller, so that the controller adjusts and generates the clamp signal according to the detection results from the control device.

[0058] The scanning display with short-circuit detection function of the present application further comprises:

[0059] a plurality of the display devices, the display devices being electrically connected in a matrix arrangement;

[0060] a plurality of the scanning devices, each scanning device being electrically connected to a corresponding display device;

[0061] a control device electrically connected to a controller of at least one of the scanning devices; and

[0062] a plurality of sequentially connected data devices, each data device electrically connected to a corresponding display device, a last data device further electrically connected to the control device, a first data device receiving detection results of all the scanning devices and sequentially transmitting the detection results to the control device via a second data device to the last data device, so that the control device transmits the detection results to the controller of the at least one of the scanning devices.

[0063] Another object of the present application is to provide a scanning device of a scanning display capable of overcoming the drawbacks of the prior art.

[0064] The scanning device of the scanning display of the present application, which comprises an array of light emitting diodes of common anode architecture and a plurality of scanning lines, comprises a plurality of scanning circuits, each of which comprises a voltage generator and a detector.

[0065] The voltage generator has an output end electrically connected to a corresponding one of the scanning lines, and is controlled to generate one of an input voltage and a clamp voltage to the corresponding scanning line at the output end.

[0066] The detector receives a detection timing signal, and is electrically connected to the output end of the voltage generator to detect the voltage at the output end, and generates a detection result indicating whether the corresponding scanning line is abnormal based on the voltage at the output end and the detection timing signal.

[0067] The scanning device of the scanning display of the present application, in each of the scanning circuits, the detector comprises,

[0068] a comparison unit having a first input end electrically connected to the output end of the voltage generator to receive the voltage at the output end, a second input end receiving a predetermined reference voltage, and an output end providing a comparison result of a comparison between the voltage at the output end and the predetermined reference voltage, and

[0069] a logic gate having a first input end electrically connected to the comparison unit to receive the comparison result, a second input end receiving the detection timing signal, and an output end, the logic gate generating the detection result at the output end based on the comparison result and the detection timing signal.

[0070] The scanning device of the scanning display of the present application, in each of the scanning circuits, the voltage generator comprises,

[0071] a scan switch having a first end for receiving the input voltage, and a second end electrically connected to the output end of the voltage generator, the scan switch being controlled by a scan signal to be conductive or non-conductive, and outputting the input voltage to the corresponding scanning line when conductive,

[0072] a voltage stabilizer for generating the clamp voltage, and

[0073] A clamp switch has a first end electrically connected to the voltage regulator to receive the clamp voltage, and a second end electrically connected to the output of the voltage generator, the clamp switch being controlled by a clamp signal to be turned on or off, and when turned on, outputting the clamp voltage to the corresponding scan line.

[0074] The scanning device of the scanning display of the present application further comprises:

[0075] A controller is electrically connected to the detectors, the scan switches and the clamp switches of the voltage generators of each scan circuit, receives and outputs the detection results from the detectors, and generates and outputs the detection timing signals required by each detector, the scan signals required by each scan switch, and the clamp signals required by each clamp switch, the clamp signals being varied with the changes of the detection results respectively.

[0076] The present application has the advantage that the output of each voltage generator is detected by each detector, so that it can be known in real time whether the corresponding scan line is abnormal due to the short circuit of the corresponding light emitting diode, so as to avoid the short circuit caterpillar phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0077] Other features and effects of the present application will be clearly presented in the embodiments with reference to the accompanying drawings.

[0078] Figure 1 FIG. 1 is a circuit block diagram illustrating a first embodiment of a scanning display with a short circuit detection function of the present application;

[0079] Figure 2 FIG. 2 is a circuit block diagram illustrating a scanning device of the first embodiment;

[0080] Figures 3 to 11 FIG. 3 illustrates various implementation manners of the detection results of the first embodiment being transmitted to the corresponding controller through different transmission paths;

[0081] Figure 12 FIG. 4 is a timing diagram illustrating the scan signals, the clamp signals, the detection timing signals, a data signal, and the voltage of an output terminal of the first embodiment;

[0082] Figure 13 FIG. 5 is a timing diagram illustrating the scan signals, the clamp signals, the data signal, and the voltage of the output terminal of the first embodiment;

[0083] Figure 14 FIG. 6 is a circuit block diagram illustrating a second embodiment of a scanning display with a short circuit detection function of the present application;

[0084] FIG. 7 is a circuit block diagram illustrating a scanning device of the second embodiment;Figure 15 FIG. 2 is a circuit block diagram illustrating a scan device of the second embodiment; and

[0085] Figure 16 FIG. 3 is a timing diagram illustrating scan signals, clamp signals, and a switching signal of the second embodiment. DETAILED DESCRIPTION

[0086] Before the present application is described in detail, it is to be understood that like elements are denoted by like numerals in the description and the drawings.

[0087] <First Embodiment>

[0088] Referring to Figure 1 and Figure 2 , the present application has a short-circuit detection function, and a scan display includes a display device 1, a scan device 2, a data device 3, a control device 4, and other necessary elements (not shown).

[0089] The display device 1 includes a common anode architecture light emitting diode (LED) array 11. The LED array 11 includes a plurality of scan lines 111, a plurality of data lines 112, and a plurality of LEDs 113.

[0090] The scan lines 111 are arranged in a row direction. The data lines 112 are arranged in a column direction perpendicular to the scan lines 111. The LEDs 113 are arranged in a matrix defined by the scan lines 111 and the data lines 112, respectively. Each LED 113 has an anode electrically connected to a corresponding scan line 111, and a cathode electrically connected to a corresponding data line 112.

[0091] The scan device 2 includes N scan circuits 21 and a controller 22, N being a positive integer. In the present embodiment, each scan circuit 21 includes a voltage generator 211 and a detector 212.

[0092] The voltage generator 211 has an output terminal Q1 electrically connected to a corresponding scan line 111 of the scan lines 111, and generates one of an input voltage Vin and a clamp voltage Vc to the corresponding scan line 111 under the control of the output terminal Q1. In the present embodiment, the clamp voltage Vc is used to improve the ghosting phenomenon and coupling problem of known LED displays, which is well known to those skilled in the art, and is not described here for brevity. The voltage generator 211 of each scan circuit 21 includes a scan switch 213, a voltage regulator 214 for generating the clamp voltage Vc, and a clamp switch 215.

[0093] The scan switch 213 has a first terminal for receiving the input voltage Vin, and a second terminal electrically connected to the output terminal Ql of the voltage generator 211. The scan switch 213 is controlled by a scan signal SCj to be turned on or off, and outputs the input voltage Vin to the corresponding scan line 111 when turned on, j being a positive integer, 0 < j < N. Further, the scan switch 213 of the first scan circuit 21 is controlled by the scan signal SCI, the scan switch 213 of the second scan circuit 21 is controlled by the scan signal SC2, and so on.

[0094] The clamp switch 215 has a first terminal electrically connected to the voltage stabilizer 214 for receiving the clamp voltage Vc, and a second terminal electrically connected to the output terminal Ql of the voltage generator 211. The clamp switch 215 is controlled by a clamp signal CSj to be turned on or off, and outputs the clamp voltage Vc to the corresponding scan line 111 when turned on. Further, the clamp switch 215 of the first scan circuit 21 is controlled by the clamp signal CS1, the clamp switch 215 of the second scan circuit 21 is controlled by the clamp signal CS2, and so on.

[0095] The detector 212 receives a detection timing signal DTj, and is electrically connected to the output terminal Ql of the voltage generator 211 for detecting the voltage of the output terminal Ql, and generates a detection result Drj indicating whether the corresponding scan line 111 is abnormal according to the voltage of the output terminal Ql and the detection timing signal DTj. In detail, when each LED 113 electrically connected to the corresponding scan line 111 electrically connected to the scan circuit 21 is not short-circuited, the voltage of the output terminal Ql will not be abnormally high for a short time, and thus the corresponding scan line 111 is not in an abnormal state; when any one of the LEDs 113 electrically connected to the corresponding scan line 111 electrically connected to the scan circuit 21 is short-circuited, the voltage of the output terminal Ql will be abnormally high for a short time, causing the corresponding scan line 111 to be in an abnormal state. In this embodiment, the detector 212 of each scan circuit 21 includes a comparison unit 216 and a logic gate 217.

[0096] The comparison unit 216 has a first input terminal electrically connected to the output terminal Ql of the voltage generator 211 for receiving the voltage of the output terminal Ql, a second input terminal for receiving a predetermined reference voltage Vr, and an output terminal for providing a comparison result Cr of the comparison between the voltage of the output terminal Ql and the predetermined reference voltage Vr.

[0097] The logic gate 217 has a first input electrically connected to the comparison unit 216 to receive the comparison result Cr, a second input to receive the detection timing signal DTj, and an output. The logic gate generates the detection result Drj at the output according to the comparison result Cr and the detection timing signal DTj. In the embodiment, the logic gate 217 is an AND gate, but is not limited thereto.

[0098] The controller 22 is electrically connected to the detectors 212 of each scan circuit 21 and the scan switches 213 and clamp switches 215 of the voltage generators 211, receives and outputs the detection results Dr1-Drj from the logic gates 217 of the detectors 212, and generates and outputs the detection timing signals DTj required by each logic gate 217, the scan signals SCj required by each scan switch 213, and the clamp signals CSj required by each clamp switch 215. The clamp signals CS1-CSj vary with the detection results Dr1-Drj, respectively. It is noted that, as shown in Figure 2 The controller 22 adjusts and generates the clamp signals CS1-CSj according to the detection results Dr1-Drj from the logic gates 217 of the detectors 212, respectively (for further explanation, in Figure 2 , only the jth scan circuit 21 is shown for the sake of simplicity, but is not limited thereto. The controller 22 can also adjust and generate the corresponding clamp signals according to the detection results from the data device 3, the detection results from the control device 4, or the detection results received via the data device 3 and the control device 4. In addition, the control device 4 can be operated to generate the related parameter settings and gray scale data required for normal display of the scan device 2 and the data device 3. Since the technology of the control device 4 is well known to those skilled in the art and is not a feature of the present application, the details thereof are omitted here.

[0099] In detail, referring to Figures 3 to 5 , different embodiments of the controller 22 generating the corresponding clamp signals according to the detection results from the data device 3 are described.

[0100] Referring to Figure 1 and Figure 3The scanning display with short-circuit detection function of the present application only includes one display device 1, one scanning device 2, one data device 3, and the control device 4 (not shown in the figure). The data device 3 is electrically connected to the data line 112 of the display device 1 and the controller 22 of the scanning device 2. The data device 3 provides a plurality of data signals VD1~VDj to the data line 112 respectively, receives detection results Dr1~Drj from the controller 22 to know whether the corresponding scanning line 111 is abnormal, and transmits the detection results Dr1~Drj back to the controller 22, so that the controller 22 adjusts and generates the clamp signals CS1~CSj respectively according to the detection results Dr1~Drj from the data device 3.

[0101] Referring to Figure 4 and Figure 5 The scanning display with short-circuit detection function of the present application includes a plurality of display devices 1 electrically connected in a matrix arrangement, a plurality of scanning devices 2, a plurality of data devices 3 connected in sequence, and the control device 4 (not shown in the figure). Each scanning device 2 is electrically connected to the corresponding display device 1. Each data device 3 is electrically connected to the corresponding display device 1. In Figure 4 , the scanning devices 2 are connected in sequence. The first data device 3 is electrically connected to the controller 22 of the second scanning device 2. The last data device 3 (i.e., the second data device 3) is electrically connected to the controller 22 of the first scanning device 2. The first scanning device 2 transmits the detection results Dr1~Drj output by the controller 22 of itself to the second scanning device 2. The second scanning device 2 transmits the detection results Dr1'~Drj' output by the controller 22 of itself and the detection results Dr1~Drj from the first scanning device 2 to the first data device 3. The first data device 3 receives all the detection results Dr1~Drj, Dr1'~Drj', and transmits the detection results Dr1~Drj, Dr1'~Drj' to the controller 22 of the first scanning device 2 via the second data device 3 (i.e., all the detection results are transmitted to the controller of at least one scanning device in the scanning devices via the second data device to the last data device in sequence), and the first scanning device 2 transmits the detection results Dr1'~Drj' to the controller 22 of the second scanning device 2, so that the controllers 22 respectively adjust and generate the corresponding clamp signals according to the corresponding detection results. Figure 5 and Figure 4 Similarly, the difference between the two is that Figure 5In the embodiment, the scan devices 2 are not sequentially connected. The controller 22 of each scan device 2 is electrically connected to the first data device 3 and the last data device 3. The scan devices 2 respectively transmit the detection results Dr1~Drj and the detection results Dr1'~Drj' to the first data device 3. The first data device 3 transmits the detection results Dr1~Drj, Dr1'~Drj' to the controller 22 of the scan devices 2 via the second data device 3, so that the controller 22 respectively adjusts and generates the corresponding clamp signals according to the corresponding detection results.

[0102] Referring to Figures 6 to 8 , different embodiments of the controller 22 generating the corresponding clamp signals according to the detection results from the control device 4 are described.

[0103] Referring to Figure 6 , Figure 6 and Figure 3 are similar, the difference is that, Figure 6 In the embodiment, the data devices 3 are not electrically connected to the controllers 22 of the scan devices 2, and the controllers 22 of the scan devices 2 are electrically connected to the control device 4. The control device 4 receives the detection results Dr1~Drj from the controllers 22 to know whether the corresponding scan lines 111 are abnormal, and transmits the detection results Dr1~Drj back to the controllers 22, so that the controllers 22 respectively adjust and generate the clamp signals CS1~CSj according to the detection results Dr1~Drj from the control device 4.

[0104] Referring to Figure 7 , Figure 7 and Figure 6 are similar, the difference is that, Figure 7The scanning display of the present application comprises a plurality of display devices 1 arranged in a matrix, a plurality of scanning devices 2 connected in series, and a plurality of data devices 3 not connected in series. The controller 22 of the second scanning device 2 is electrically connected to the control device 4. The first scanning device 2 transmits the detection results Dr1-Drj outputted by the controller 22 thereof to the second scanning device 2. The second scanning device 2 transmits the detection results Dr1'-Drj' outputted by the controller 22 thereof and the detection results Dr1-Drj from the first scanning device 2 to the control device 4. The control device 4 receives all the detection results Dr1-Drj, Dr1'-Drj' and transmits them to the controller 22 of the first scanning device 2 and the controller 22 of the second scanning device 2, so that the controllers 22 respectively adjust and generate the corresponding clamp signals according to the corresponding detection results.

[0105] Further referring to Figure 8 , Figure 8 and Figure 7 similarly, the difference between them is that Figure 8 in which the scanning devices 2 are not connected in series, and the controller 22 of each scanning device 2 is electrically connected to the control device 4. The controllers 22 of the scanning devices 2 respectively transmit the detection results Dr1-Drj and the detection results Dr1'-Drj' to the control device 4. The control device 4 transmits the detection results Dr1-Drj, Dr1'-Drj' to the controllers 22 of the scanning devices 2, so that the controllers 22 respectively adjust and generate the corresponding clamp signals according to the corresponding detection results.

[0106] Referring to Figures 9 to 11 which illustrates different embodiments of the controller 22 generating the corresponding clamp signals according to the detection results received from the data devices 3 and the control device 4.

[0107] Referring to Figure 9In this embodiment, the scanning display with short-circuit detection function of the present invention comprises only a single display device 1, a single scanning device 2, a single data device 3, and a control device 4. The controller 22 of the scanning device 2, the data device 3, and the control device 4 are connected in series. The data device 3 receives and outputs the detection results Dr1 to Drj from the controller 22. The control device 4 receives the detection results Dr1 to Drj from the data device 3 and transmits the detection results Dr1 to Drj back to the controller 22, so that the controller 22 adjusts and generates the clamping signals CS1 to CSj respectively according to the detection results Dr1 to Drj from the control device 4.

[0108] See Figure 10 , Figure 11 The present invention, a scanning display with short-circuit detection function, comprises a plurality of display devices 1 electrically connected in a matrix arrangement, a plurality of scanning devices 2, a plurality of data devices 3 connected in series, and a control device 4. Figure 10 In this configuration, the scanning devices 2 are connected in series, and the data device 3 is electrically connected between the last scanning device 2 (i.e., the second scanning device 2) and the control device 4. The control device 4 is electrically connected between the last data device 3 and the controller 22 of the first scanning device 2. The first scanning device 2 transmits the detection results Dr1 to Drj output by its own controller 22 to the second scanning device 2. The second scanning device 2 transmits the detection results Dr1' to Drj' output by its own controller 22, and the detection results Dr1 to Drj from the first scanning device 2, to the first data device 3. The first data device 3 receives all the detection results Dr1~Drj and Dr1'~Drj', and transmits the detection results Dr1~Drj and Dr1'~Drj' sequentially to the control device 4 via the second data device 3. The control device 4 then transmits the detection results Dr1~Drj and Dr1'~Drj' to the controller 22 of the first scanning device 2. The first scanning device 2 transmits the detection results Dr1'~Drj' to the controller 22 of the second scanning device 2, so that the controller 22 adjusts and generates the corresponding clamping signal according to the corresponding detection result. Figure 11 and Figure 10 Similar, the difference between the two lies in, Figure 11In the embodiment, the scanning devices 2 are not sequentially connected in series, the data device 3 is electrically connected between the controller 22 of the scanning device 2 and the control device 4, and the control device 4 is electrically connected between the last data device 3 and the controller 22 of the scanning device 2. The controller 22 transmits the detection results Dr1-Drj and the detection results Dr1'-Drj' to the first data device 3, respectively. The first data device 3 transmits the detection results Dr1-Drj and the detection results Dr1'-Drj' to the control device 4 via the second data device 3. The control device 4 transmits the detection results Dr1-Drj and the detection results Dr1'-Drj' to the controller 22 of each scanning device 2, so that the controller 22 adjusts and generates the corresponding clamp signals according to the corresponding detection results, respectively.

[0109] Referring to Figure 12 , which is a timing diagram, the following takes the first embodiment as an example, which has only one display device 1, one scanning device 2, one data device 3, N=4 (i.e., the display device 1 includes four scanning lines 111, four data lines 112, and sixteen LED units 113, and the scanning device 2 includes four scanning circuits 21), and the controller 22 directly generates clamp signals CS1-CS4 according to the detection results Dr1-Dr4 from the logic gate 217 of the detector 212, but is not limited thereto, to illustrate four scanning signals SC1-SC4, four clamp signals CS1-CS4, and four detection timing signals DT1-DT4. Meanwhile, the following takes the example of a short circuit occurring in one LED 113 electrically connected to the corresponding scanning line 111 electrically connected to the second scanning circuit 21, but is not limited thereto, to illustrate the voltage NV Q1 of the output terminal Q1 when each LED 113 electrically connected to the corresponding scanning line 111 electrically connected to the second scanning circuit 21 is not short-circuited, and the voltage SV Q1 of the output terminal Q1 when a short circuit occurs in the LED 113 electrically connected to the corresponding scanning line 111.

[0110] In detail, one scan period T of each scan circuit 21 includes one scan interval Si and one clamp interval Ci. The clamp interval Ci has N-1 (i.e., N-1 = 4-1 = 3) first clamp periods C1 when each LED 113 electrically connected to the corresponding scan line 111 electrically connected to each scan circuit 21 is not short-circuited. Each first clamp period C1 has a delay time tl and a clamp-on time t2. In each scan circuit 21, during the scan interval Si, the scan signal SCj (i.e., one corresponding scan signal among the scan signals SC1-SC4) has an on level (i.e., logic "1"), and the clamp signal CSj (i.e., one corresponding clamp signal among the clamp signals CS1-CS4) has an off level (i.e., logic "0"). During the clamp interval Ci, the scan signal SCj has the off level, and during the delay time tl of each first clamp period C1, the clamp signal CSj has the off level, and during the clamp-on time t2 of each first clamp period C1, the clamp signal CSj has the on level. In each scan circuit 21, during the scan interval Si, during the first first clamp period C1 of the clamp interval Ci (i.e., one first clamp period C1 closest to the scan interval Si among the first clamp periods C1), and during each clamp-on time t2 of the second to N-1 (i.e., N-1 = 4-1 = 3) first clamp periods C1, the corresponding detection timing signal DTj (i.e., one corresponding detection timing signal among the detection timing signals DT1-DT4) has a non-detection level. During each delay time tl of the second to N-1 (i.e., N-1 = 4-1 = 3) first clamp periods C1 of the clamp interval Ci, the corresponding detection timing signal DTj has a detection level. Further, in adjacent two scan circuits 21, an end point of the on level of the scan signal SCj of a former scan circuit 21 corresponds to a start point of the on level of the scan signal SCj of a latter scan circuit 21. An end point of the first first clamp period C1 of the clamp interval Ci of the scan period T of the former scan circuit 21 corresponds to the end point of the on level of the scan signal SCj of the latter scan circuit 21. The second to N-1 (i.e., N-1 = 4-1 = 3) first clamp periods C1 of the clamp interval Ci of the scan period T of the former scan circuit 21 respectively correspond to the first to N-2 (i.e., N-2 = 4-2 = 2) first clamp periods C1 of the latter scan circuit 21.

[0111] In this case, when a short circuit occurs in the LED 113 electrically connected to the corresponding scan line 111, the detection result Drj generated by the logic gate 217 has a high logic level "1" when the detection timing signal DTj has the detection level, to indicate that the corresponding scan line 111 is abnormal. The following takes the short circuit in the LED 113 electrically connected to the corresponding scan line 111 of the second scan circuit 21 as an example for detailed description. When a short circuit occurs in the LED 113 corresponding to the second scan circuit 21, the voltage of the output terminal Q1 of the second scan circuit 21 is abnormally pulled high for a short time (as shown in FIG. 6) under the inconducting levels of the scan signal SC2 and the clamp signal CS2, and the influence of the corresponding data signal VD2. As a result, the comparison result Cr generated by the comparison unit 216 of the second scan circuit 21 according to the voltage SV of the output terminal Q1 and the predetermined reference voltage Vr has the high logic level, so that the detection result Dr2 generated by the detector 212 of the second scan circuit 21 according to the voltage SV of the output terminal Q1 and the detection timing signal DT2 has the high logic level when the detection timing signal DT2 has the detection level, and thus it can be known that the corresponding scan line 111 is abnormal. Similarly, the operation modes of the remaining scan circuits 21 are as described above. Figure 12 the voltage SV of the output terminal Q1 Q1 Q1 the voltage SV of the output terminal Q1 Q1 the voltage SV of the output terminal Q1

[0112] Further referring to Figure 13 ​, when the detection result Drj indicates that the corresponding scan line 111 is abnormal, the controller 22 adjusts the clamp signal CSj according to the detection result Drj, so that the clamp interval Ci of the scan circuit 21 corresponding to the scan line 111 which is abnormal has the second clamp period C2, the third clamp period C3, and the fourth clamp period C4 instead of the three first clamp periods C1. In detail, when the corresponding scan line 111 is abnormal, the scan signal SCj has the on level and the clamp signal CSj has the off level in the scan interval Si. In the clamp interval Ci, the scan signal SCj has the off level, the clamp signal CSj has the off level in the second clamp period C2 and the fourth clamp period C4, and the clamp signal CSj has the on level in the third clamp period C3. The duration of the third clamp period C3 is less than the clamp on time t2 of the first clamp period C1. Similarly, the following takes the short-circuit of the LED 113 electrically connected to the corresponding scan line 111 electrically connected to the second scan circuit 21 as an example for illustration. In the scan interval Si, the scan signal SC2 has the on level and the clamp signal CS2 has the off level. In the clamp interval Ci, the scan signal SC2 has the off level, the clamp signal CS2 has the off level in the second clamp period C2 and the fourth clamp period C4, and the clamp signal CS2 has the on level in the third clamp period C3. In this way, the voltage of the output terminal Q1 becomes as shown in the voltage SV Figure 13 Q1 ’.In the fourth clamp period C4 of each scan period T of the second scan circuit 21, because the corresponding LED 113 is short-circuited, and the scan signal SC2 and the clamp signal CS2 have the off level, the voltage SV Q1 ’ of the output terminal Q1 is approximately the voltage of the data signal VD2 affected by the data signal VD2, and the voltage SV Q1 ’ of the output terminal Q1 cannot be clamped by the clamp voltage Vc to clamp the voltage of the data line 112, so that the LEDs 113 of the data line 112 corresponding to the data signal VD2 cannot be constantly bright or dark, thereby avoiding the short-circuit caterpillar phenomenon.

[0113] <Second Embodiment>

[0114] Referring to Figure 14 , Figure 15A second embodiment of the short-circuit detection function scanning display is a modification of the first embodiment, the difference between them is that the control device 4 is omitted; the controller 22 is not electrically connected to the data device 3, and is not electrically connected to the output end of the logic gate 217 of each scanning circuit 21, so that the controller 22 does not receive the detection results Dr1-Drj, and does not adjust the clamp signals CS1-CSj according to the detection results Dr1-Drj, respectively, so that the clamp signals CS1-CSj do not change with the change of the detection results Dr1-Drj, respectively; in each scanning circuit 21, the voltage stabilizer 214 is also electrically connected to the output end of the logic gate 217 of the detector 212 to receive the detection result Drj, and generates a switching signal according to the detection result Drj; in each scanning circuit 21, the voltage generator 211 further includes a switching switch 218, which has a first end electrically connected to the voltage stabilizer 214 to receive the clamp voltage Vc, a second end electrically connected to the first end of the clamp switch 215, and a control end electrically connected to the voltage stabilizer 214 to receive the switching signal, the switching switch 218 is controlled by the switching signal to be turned on or not.

[0115] In the second embodiment, whether each LED 113 electrically connected by the corresponding scan line 111 electrically connected by each scanning circuit 21 is short-circuited or not, the four scan signals SC1-SC4, the four clamp signals CS1-CS4, and the four detection timing signals DT1-DT4 are respectively as shown in the four scan signals SC1-SC4, the four clamp signals CS1-CS4, and the four detection timing signals DT1-DT4. Figure 12

[0116] Further referring to Figure 16 , it is explained that when each LED 113 electrically connected by the corresponding scan line 111 electrically connected by each scanning circuit 21 is not short-circuited, the switching signal generated by the voltage stabilizer 214 according to the detection result Drj is as shown in the signal NSw. Figure 16 When one LED 113 electrically connected by the corresponding scan line 111 is short-circuited, the switching signal generated by the voltage stabilizer 214 according to the detection result Drj is as shown in the signal NSw. Figure 16 ​The switching signal NSw only has the on level when each LED 113 electrically connected to the corresponding scan line 111 electrically connected to the second scan circuit 21 is not short-circuited. When the detection result Dr2 indicates that the corresponding scan line 111 is abnormal, the switching signal NSw is adjusted by the voltage regulator 214 to the switching signal SSw, and the switching signal SSw only maintains the on level at the on time t3. The on time t3 corresponds to a part of the clamp on time t2 of the first clamp period C1 of the clamp interval Ci of the second scan circuit 21 indicated by the detection result Dr2 as abnormal (i.e., the duration of the on time t3 is less than the clamp on time t2). In this way, the second embodiment, like the first embodiment, at a clamp period C5 of each scan period T of the second scan circuit 21, due to the corresponding LED 113 being short-circuited, and the scan signal SC2 and the switching signal SSw having the off level, causes the voltage of the output terminal Q1 to be affected by the data signal VD2 to be approximately the voltage of the data signal VD2, and the voltage of the output terminal Q1 is not affected by the clamp voltage Vc, so that the plurality of LEDs 113 of the data line 112 corresponding to the data signal VD2 are not constantly bright or constantly dark, and the short-circuit caterpillar phenomenon can also be avoided.

[0117] In summary, the short-circuit detection function of the scanning display is achieved by detecting the output end Q1 of each voltage generator 211 by each detector 212, and transmitting the detection result Drj to the corresponding controller 22 (or the detection result Drj is transmitted to the corresponding voltage stabilizer 214), so that each controller 22 (or each voltage stabilizer 214) can know whether the corresponding scanning line 111 is abnormal due to the short circuit of the LED 113, and adjust the corresponding clamp signal CSj (or adjust the corresponding switching signal NSw to the switching signal SSw), so that the voltage of the corresponding output end Q1 will not be affected by the clamp voltage Vc due to the short circuit of any one of the corresponding LEDs 113, so that the LED 113 of the data line 112 of the corresponding data signal VDj will not be constantly bright or dark, thereby avoiding the short-circuit caterpillar phenomenon. In addition, the scanning device 2 transmits the detection results Dr1-Drj to the data device 3 or the control device 4 to inform the data device 3 or the control device 4 whether the scanning line 111 is abnormal, and the scanning device 2 has the function of informing.

[0118] The above is only an embodiment of the present application, and cannot limit the scope of the present application. Any simple equivalent changes and modifications made in accordance with the claims and content of the specification are still within the scope of the present application.

Claims

1. A scanning display with short-circuit detection function, characterized in that, A display device comprising: a common anode architecture light emitting diode array comprising, a plurality of scan lines arranged along a row direction, a plurality of data lines arranged perpendicularly to the scan lines along a column direction, and a plurality of light emitting diodes arranged in a matrix defined by the scan lines and the data lines, each light emitting diode having an anode electrically connected to a corresponding scan line and a cathode electrically connected to a corresponding data line; and a scan device comprising a plurality of scan circuits, each scan circuit comprising, a voltage generator having an output electrically connected to a corresponding scan line of the scan lines and controlled to generate one of an input voltage and a clamp voltage to the corresponding scan line at the output, and a detector receiving a detection timing signal and electrically connected to the output of the voltage generator to detect a voltage at the output and generate a detection result indicating whether the corresponding scan line is abnormal based on the voltage at the output and the detection timing signal, wherein, in each scan circuit, the voltage generator comprises, a scan switch having a first terminal for receiving the input voltage and a second terminal electrically connected to the output of the voltage generator, the scan switch being controlled by a scan signal to be conductive or non-conductive and, when conductive, output the input voltage to the corresponding scan line, a voltage regulator for generating the clamp voltage, and a clamp switch having a first terminal electrically connected to the voltage regulator for receiving the clamp voltage and a second terminal electrically connected to the output of the voltage generator, the clamp switch being controlled by a clamp signal to be conductive or non-conductive and, when conductive, output the clamp voltage to the corresponding scan line, the number of scan circuits is N, N being a positive integer, a scan period of each scan circuit comprises a scan interval and a clamp interval, when each light emitting diode electrically connected to the corresponding scan line electrically connected in each scan circuit is not short-circuited, the clamp interval has N-1 first clamp periods, each first clamp period has a delay time and a clamp-on time, in each delay time of the second to N-1 first clamp periods in the clamp interval, the detection timing signal has a detection level, in each scan circuit, when the detection result indicates that the corresponding scan line is abnormal, the clamp interval has a second clamp period, a third clamp period and a fourth clamp period, when the corresponding scan line is abnormal, in the scan interval, the scan signal has a conductive level, the clamp signal has a non-conductive level, in the clamp interval, the scan signal has the non-conductive level, in the second clamp period and the fourth clamp period, the clamp signal has the non-conductive level, and in the third clamp period, the clamp signal has the conductive level, and the duration of the third clamp period is less than the clamp-on time of the first clamp period.

2. The short-circuit detecting function-equipped scanning display according to claim 1, characterized by: in each scan circuit, the detector comprises, a comparison unit having a first input electrically connected to an output of the voltage generator to receive a voltage of the output, a second input to receive a predetermined reference voltage, and an output to provide a comparison result of a comparison between the voltage of the output and the predetermined reference voltage, and a logic gate having a first input electrically connected to the comparison unit to receive the comparison result, a second input to receive the detection timing signal, and an output, the logic gate generating the detection result at the output according to the comparison result and the detection timing signal.

3. The short-circuit detecting function-equipped scanning display according to claim 1, wherein: The scan device further comprises a controller electrically connected to the detectors of each scan circuit and the scan switches and clamp switches of the voltage generator, receiving and outputting the detection result from the detectors, and generating and outputting the detection timing signal required by each detector, the scan signal required by each scan switch, and the clamp signal required by each clamp switch, the clamp signal being varied according to the detection result.

4. The short-circuit detecting function-equipped scanning display according to claim 1, characterized by: In each scan circuit, during the scan interval, the scan signal has the on level, the clamp signal has the off level, during the clamp interval, the scan signal has the off level, during the delay time of each first clamp period, the clamp signal has the off level, and during the clamp-on time of each first clamp period, the clamp signal has the on level, during the scan interval, the first clamp period of the clamp interval, and the clamp-on time of the second to N-1th first clamp periods, the detection timing signal has a non-detection level.

5. The short-circuit detecting function-equipped scanning display according to claim 4, characterized by: In adjacent two scan circuits, an end point of the on level of the scan signal of the previous scan circuit corresponds to a start point of the on level of the scan signal of the next scan circuit, an end point of the first clamp period of the clamp interval of the scan period of the previous scan circuit corresponds to an end point of the on level of the scan signal of the next scan circuit, and the second to N-1th first clamp periods of the clamp interval of the scan period of the previous scan circuit correspond to the first to N-2th first clamp periods of the next scan circuit, respectively.

6. The short-circuit detecting function-equipped scanning display according to claim 3, wherein Further comprising: a data device electrically connected to the data lines of the display device and the controller of the scan device, receiving the detection result from the controller, and feeding back the detection result to the controller, so that the controller adjusts and generates the clamp signal according to the detection result from the data device, respectively.

7. The short-circuit detecting function-equipped scanning display according to claim 3, wherein Further comprising: a plurality of the display devices, the display devices being electrically connected in a matrix arrangement; a plurality of the scan devices, each scan device being electrically connected to the corresponding display device; and the scan device further comprises a plurality of the scan circuits, each scan circuit being electrically connected to a corresponding one of the display devices. A plurality of sequentially connected data devices, each of which is electrically connected to a corresponding one of the display devices, the last one of the data devices is further electrically connected to a controller of at least one of the scanning devices, the first one of the data devices receives detection results of all the scanning devices, and sequentially transmits the detection results to the controller of the at least one of the scanning devices via the second one to the last one of the data devices.

8. The short-circuit detecting function-equipped scanning display according to claim 3, wherein Further comprising: A control device electrically connected to the controller of the scanning devices, and receives the detection results from the controller, and transmits the detection results back to the controller, so that the controller adjusts and generates the clamp signals according to the detection results from the control device.

9. The short-circuit detecting function-equipped scanning display according to claim 3, wherein Further comprising: A data device electrically connected to data lines of the display devices, and to the controller of the scanning devices, and receives and outputs the detection results from the controller; And A control device electrically connected to the data device to receive the detection results, and electrically connected to the controller of the scanning devices, and transmits the detection results back to the controller, so that the controller adjusts and generates the clamp signals according to the detection results from the control device.

10. The short-circuit detecting function-equipped scanning display according to claim 3, wherein Further comprising: A plurality of the display devices, which are electrically connected in a matrix arrangement; A plurality of the scanning devices, each of which is electrically connected to a corresponding one of the display devices; A control device electrically connected to a controller of at least one of the scanning devices; and A plurality of sequentially connected data devices, each of which is electrically connected to a corresponding one of the display devices, the last one of the data devices is further electrically connected to the control device, the first one of the data devices receives detection results of all the scanning devices, and sequentially transmits the detection results to the control device via the second one to the last one of the data devices, so that the control device transmits the detection results to the controller of the at least one of the scanning devices.

11. A scanning display with short-circuit detection, characterized by: Comprising: A display device comprising an array of light emitting diodes in a common anode configuration, the array of light emitting diodes comprising, a plurality of scan lines arranged along a row direction with respect to each other, a plurality of data lines arranged along a column direction with respect to each other perpendicularly to the scan lines, and a plurality of light emitting diodes arranged in a matrix defined by the scan lines and the data lines, each of the light emitting diodes having an anode electrically connected to a corresponding one of the scan lines, and a cathode electrically connected to a corresponding one of the data lines; And A scanning device comprising a plurality of scanning circuits, each of the scanning circuits comprising, a voltage generator having an output electrically connected to a corresponding one of the scan lines, and being controlled to generate one of an input voltage and a clamp voltage to the corresponding one of the scan lines at the output, and a detector receiving a detection timing signal, and being electrically connected to the output of the voltage generator to detect a voltage at the output, and generating a detection result indicating whether the corresponding one of the scan lines is abnormal according to the voltage at the output and the detection timing signal, The voltage generator comprises, in each scan circuit, a scan switch having a first terminal for receiving the input voltage and a second terminal electrically connected to an output terminal of the voltage generator, the scan switch being controlled to be conductive or non-conductive by a scan signal, and outputting the input voltage to the corresponding scan line when conductive, a voltage stabilizer for generating the clamp voltage, and a clamp switch having a first terminal electrically connected to the voltage stabilizer for receiving the clamp voltage and a second terminal electrically connected to the output terminal of the voltage generator, the clamp switch being controlled to be conductive or non-conductive by a clamp signal, and outputting the clamp voltage to the corresponding scan line when conductive, in each scan circuit, the voltage stabilizer is further electrically connected to the detector for receiving the detection result, and generating a switching signal according to the detection result, and the voltage generator further comprises, a switching switch having a first terminal electrically connected to the voltage stabilizer for receiving the clamp voltage, a second terminal electrically connected to the first terminal of the clamp switch, and a control terminal electrically connected to the voltage stabilizer for receiving the switching signal, the switching switch being controlled to be conductive or non-conductive by the switching signal, the number of the scan circuits is N, N is a positive integer, and each scan cycle of each scan circuit comprises a scan interval and a clamp interval, the clamp interval has N-1 first clamp periods, each first clamp period has a delay time and a clamp conductive time, in each delay time of the second to the N-1th first clamp periods of the clamp interval, the detection timing signal has a detection level, and in the scan cycle, when each light-emitting diode electrically connected to the corresponding scan line electrically connected to the scan circuit is not short-circuited, the switching signal has a conductive level, in each scan circuit, in the scan cycle, when the detection result indicates that the corresponding scan line is abnormal, the switching signal is maintained at the conductive level only for a conductive time, which corresponds to a part of the clamp conductive time of the first first clamp period of the clamp interval of the scan circuit indicated by the detection result to be abnormal.

12. The short-circuit detecting scanning display according to claim 11, wherein: The scan device further comprises a controller electrically connected to the detectors and the scan switches and the clamp switches of the voltage generators of each scan circuit, and generating and outputting the detection timing signals required by each detector, the scan signals required by each scan switch, and the clamp signals required by each clamp switch.

13. The short-circuit detecting scanning display according to claim 11, wherein: in each scan circuit, in the scan interval, the scan signal has the conductive level, and the clamp signal has a non-conductive level, in the clamp interval, the scan signal has the non-conductive level, in the delay time of each first clamp period, the clamp signal has the non-conductive level, and in the clamp conductive time of each first clamp period, the clamp signal has the conductive level, The detection timing signal has a non-detection level in each of the scan interval, the first first-clamp period of the clamp interval, and each of the second to N-1th first-clamp periods.

14. A scanning device for a scanning display, the scanning display comprising an array of light emitting diodes of common anode architecture and a plurality of scan lines, characterized in that, The scanning device of the scanning display comprises: a plurality of scanning circuits, each of which comprises, a voltage generator having an output end electrically connected to a corresponding scan line of the scan lines, and controlled to generate one of an input voltage and a clamp voltage to the corresponding scan line via the output end, and a detector receiving a detection timing signal and electrically connected to the output end of the voltage generator to detect the voltage of the output end, and generating a detection result indicating whether the corresponding scan line is abnormal according to the voltage of the output end and the detection timing signal, wherein, in each of the scanning circuits, the voltage generator comprises, a scan switch having a first end for receiving the input voltage, and a second end electrically connected to the output end of the voltage generator, the scan switch being controlled to be turned on or off by a scan signal, and outputting the input voltage to the corresponding scan line when turned on, a voltage stabilizer for generating the clamp voltage, and a clamp switch having a first end electrically connected to the voltage stabilizer to receive the clamp voltage, and a second end electrically connected to the output end of the voltage generator, the clamp switch being controlled to be turned on or off by a clamp signal, and outputting the clamp voltage to the corresponding scan line when turned on, the number of the scanning circuits is N, N being a positive integer, a scan period of each of the scanning circuits comprises a scan interval and a clamp interval, the clamp interval has N-1 first-clamp periods when each of the light-emitting diodes electrically connected to the corresponding scan line of each of the scanning circuits is not short-circuited, each of the first-clamp periods has a delay time and a clamp-on time, the detection timing signal has a detection level in each of the delay times of the second to N-1th first-clamp periods of the clamp interval, in each of the scanning circuits, when the detection result indicates that the corresponding scan line is abnormal, the clamp interval has a second-clamp period, a third-clamp period, and a fourth-clamp period, when the corresponding scan line is abnormal, in the scan interval, the scan signal has a turn-on level, and the clamp signal has a turn-off level, in the clamp interval, the scan signal has the turn-off level, in the second-clamp period and the fourth-clamp period, the clamp signal has the turn-off level, and in the third-clamp period, the clamp signal has the turn-on level, and the duration of the third-clamp period is less than the clamp-on time of the first-clamp period.

15. A scanning device for a scanning display according to claim 14, characterized in that: in each of the scanning circuits, the detector comprises, a comparison unit having a first input electrically connected to an output of said voltage generator for receiving a voltage at said output, a second input for receiving a predetermined reference voltage, and an output for providing a comparison result between said voltage at said output and said predetermined reference voltage, and a logic gate having a first input electrically connected to said comparison unit for receiving said comparison result, a second input for receiving said detection timing signal, and an output, said logic gate generating said detection result at said output in accordance with said comparison result and said detection timing signal.

16. The scanning means for a scanning display according to claim 14, wherein, Further comprising: a controller electrically connected to said detectors and said scan switches and said clamp switches of each of said scan circuits, receiving and outputting said detection results from said detectors, and generating and outputting said detection timing signals required by each of said detectors, said scan signals required by each of said scan switches, and said clamp signals required by each of said clamp switches, said clamp signals being varied in accordance with changes in said detection results, respectively.

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