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-cathode light-emitting diode array and including multiple scan lines and multiple data lines; and a scanning device including multiple scanning circuits. Each scanning circuit includes a voltage generator and a detector. The voltage generator has an output terminal electrically connected to a corresponding scan line and is controlled to generate one of a reference voltage and a clamping voltage to the corresponding scan line. The detector detects the voltage at the output terminal of the voltage generator and generates a detection result indicating whether the corresponding scan line is abnormal based on the voltage at the output terminal and a detection timing signal.

Description

Technical Field

[0001] This invention relates to a display and a device, and more particularly to a scanning display with short-circuit detection function and its scanning device. Background Technology

[0002] Existing driving methods for Light Emitting Diode (LED) displays can improve known LED display ghosting and coupling problems, but they also introduce other issues, such as the short-circuit caterpillar phenomenon. To further explain, ghosting is the phenomenon where the discharge current caused by the parasitic capacitance between the LED electrodes leads to the corresponding LED emitting light; this unintended LED illumination is called ghosting. Coupling is the problem where the low-brightness areas of an LED display array are affected by the high-brightness areas, resulting in inconsistent brightness and color displayed by the LED display. The short-circuit caterpillar phenomenon includes both constant-on and constant-off phenomena. A constant-on caterpillar phenomenon occurs when a short circuit in one LED of an LED array causes a corresponding column of LEDs to remain constantly lit; similarly, a constant-off caterpillar phenomenon occurs when a short circuit in one LED causes a corresponding column of LEDs to remain constantly dark. A corresponding column of LEDs is defined as multiple LEDs electrically connected to a single data line of the LED display. This short-circuit caterpillar phenomenon will affect the display effect of the LED display. Therefore, how to eliminate the short-circuit caterpillar phenomenon is an urgent problem to be solved. Summary of the Invention

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

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

[0005] The display device includes a common cathode light-emitting diode array, which includes multiple scan lines, multiple data lines, and multiple light-emitting diodes.

[0006] The scan lines are arranged in a row direction relative to each other.

[0007] The data lines are arranged perpendicularly to each other along a column direction on the scan lines.

[0008] The light-emitting diodes are respectively disposed in the matrix defined by the scan line and the data line. Each light-emitting diode has a cathode of the scan line corresponding to an electrical connection and an anode of the data line corresponding to an electrical connection.

[0009] The scanning device includes multiple 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 scan line in the scan lines, and is controlled by the output terminal to generate one of a reference voltage and a clamping voltage to the corresponding scan line.

[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. Based on the voltage at the output terminal and the detection timing signal, it generates a detection result indicating whether the corresponding scan line is abnormal.

[0012] The scanning display with short-circuit detection function of the present invention includes, in each scanning circuit, a detector comprising,

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

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

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

[0016] A scan switch has a first terminal for receiving the reference voltage and a second terminal electrically connected to the output terminal of the voltage generator. The scan switch is controlled by a scan signal to be turned on or off, and when turned on, it outputs the reference voltage to the corresponding scan line.

[0017] A voltage regulator is used to generate the clamped voltage, and

[0018] A clamping switch has a first terminal electrically connected to the voltage regulator to receive the clamping voltage, and a second terminal electrically connected to the output terminal of the voltage generator. The clamping switch is controlled by a clamping signal to be turned on or off, and when turned on, it outputs the clamping voltage to the corresponding scan line.

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

[0020] The controller is electrically connected to the detectors of each scanning circuit and the scan switch and clamp switch of the voltage generator. It receives and outputs the detection results from the detectors, 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. The clamp signals change with the detection results.

[0021] The scanning display with short-circuit detection function of the present invention has N scanning circuits, where N is a positive integer. Each scanning circuit's scanning cycle includes a scanning interval and a clamping interval. When each light-emitting diode electrically connected to the corresponding scan line of each scanning circuit is not short-circuited, the clamping interval has N-1 first clamping time periods. Each first clamping time period has a delay time and a clamping conduction time. In each scanning circuit...

[0022] Within the scanning interval, the scanning signal has a conducting level, and the clamping signal has a non-conducting level.

[0023] During the clamping interval, the scanning signal has the non-conducting level; during the delay time of each first clamping period, the clamping signal has the non-conducting level; and during the clamping on time of each first clamping period, the clamping signal has the conducting level.

[0024] During the scanning interval, during the first clamping period of the clamping interval, and during each clamping conduction time of the second to N-1th first clamping periods, the detection timing signal has a non-detection level, and

[0025] In each delay time of the second to N-1th first clamping period of the clamping interval, the detection timing signal has a detection level.

[0026] The scanning display with short-circuit detection function of the present invention has two adjacent scanning circuits,

[0027] The end point of the conduction level of the scan signal in the previous scan circuit corresponds to the start point of the conduction level of the scan signal in the next scan circuit.

[0028] The end point of the first clamping period in the clamping interval of the previous scanning circuit in the scanning cycle corresponds to the end point of the conduction level of the scanning signal of the next scanning circuit, and

[0029] The second to N-1 first clamping periods of the clamping interval of the previous scanning circuit in the scanning cycle correspond to the first to N-2 first clamping periods of the next scanning circuit, respectively.

[0030] The scanning display with short-circuit detection function of the present invention, in each scanning circuit, when the detection result indicates an abnormality in the corresponding scanning line, the clamping interval has a second clamping period, a third clamping period, and a fourth clamping period.

[0031] When the corresponding scan line is abnormal

[0032] During the scanning interval, the scanning signal has the on level, and the clamping signal has the off level.

[0033] During the clamping interval, the scanning signal has the non-conducting level; during the second clamping period and the fourth clamping period, the clamping signal has the non-conducting level.

[0034] During the third clamping period, the clamping signal has the conduction level, and the duration of the third clamping period is less than the clamping conduction time of the first clamping period.

[0035] The scanning display with short-circuit detection function of the present invention, in each scanning circuit,

[0036] The voltage regulator is also electrically connected to the detector to receive the detection result and generate a switching signal based on the detection result.

[0037] The voltage generator also includes,

[0038] A switching switch has a first terminal electrically connected to the voltage regulator to receive the clamped voltage, a second terminal electrically connected to the first terminal of the clamping switch, and a control terminal electrically connected to the voltage regulator to receive the switching signal, the switching switch being controlled by the switching signal to be turned on or off.

[0039] The scanning display with short-circuit detection function of the present invention further includes, the scanning device,

[0040] The controller is electrically connected to the detectors of each scanning circuit and the scan switch and clamp switch of the voltage generator, 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.

[0041] The present invention relates to a scanning display with short-circuit detection function, wherein the number of scanning circuits is N, where N is a positive integer. Each scanning circuit's scanning cycle includes a scanning interval and a clamping interval. The clamping interval has N-1 first clamping time periods, each first clamping time period having a delay time and a clamping conduction time. In each scanning circuit...

[0042] Within the scanning interval, the scanning signal has a conducting level, and the clamping signal has a non-conducting level.

[0043] During the clamping interval, the scanning signal has the non-conducting level; during the delay time of each first clamping period, the clamping signal has the non-conducting level; and during the clamping on time of each first clamping period, the clamping signal has the conducting level.

[0044] During the scanning interval, during the first clamping period of the clamping interval, and during each clamping conduction time of the second to N-1th first clamping periods, the detection timing signal has a non-detection level.

[0045] In each delay time of the second to N-1th first clamping period of the clamping interval, the detection timing signal has a detection level, and

[0046] During 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 the on level.

[0047] In the scanning display with short-circuit detection function of the present invention, in each scanning circuit, during the scanning cycle, when the detection result indicates an abnormality in the corresponding scanning line, the switching signal is maintained at the conduction level for only one conduction time, the conduction time corresponding to a portion of the clamping conduction time of the first first clamping period of the clamping interval of the scanning circuit in which the detection result indicates an abnormality.

[0048] The scanning display with short-circuit detection function of the present invention further includes:

[0049] A data device is configured to receive an input voltage and be electrically connected to a data line of the display device and a controller of the scanning device, and to receive detection results from the controller and transmit the detection results back to the controller, such that the controller adjusts and generates the clamping signals according to the detection results from the data device.

[0050] The scanning display with short-circuit detection function of the present invention further includes:

[0051] Multiple of the aforementioned display devices;

[0052] Multiple scanning devices, each of which is electrically connected to a corresponding display device; and

[0053] Multiple data devices are connected in series in sequence. Each data device is electrically connected to the corresponding display device. The last data device is also electrically connected to the controller of at least one of the scanning devices. The first data device receives the detection results of all the scanning devices and transmits the detection results sequentially to the controller of the at least one of the scanning devices via the second data device to the last data device.

[0054] The scanning display with short-circuit detection function of the present invention further includes:

[0055] The control device is electrically connected to the controller of the scanning device, receives detection results from the controller, and transmits the detection results back to the controller, so that the controller adjusts and generates the clamping signals according to the detection results from the control device.

[0056] The scanning display with short-circuit detection function of the present invention further includes:

[0057] A data device, electrically connected to the data cable of the display device and the controller of the scanning device, and receiving and outputting the detection results from the controller; and

[0058] A control device is electrically connected to the data device to receive the detection results and electrically connected to the controller of the scanning device, and transmits the detection results back to the controller, such that the controller adjusts and generates the clamping signals according to the detection results from the control device.

[0059] The scanning display with short-circuit detection function of the present invention further includes:

[0060] Multiple of the aforementioned display devices;

[0061] Multiple scanning devices, each of which is electrically connected to a corresponding display device;

[0062] Control device, controller electrically connected to at least one of the scanning devices; and

[0063] Multiple data devices are connected in series in sequence. Each data device is electrically connected to the corresponding display device. The last data device is also electrically connected to the control device. The first data device receives the detection results of all the scanning devices and transmits the detection results sequentially to the control device via the second data device to the last data device, so that the control device transmits the detection results to the controller of at least one of the scanning devices.

[0064] Another object of the present invention is to provide a scanning device for a scanning display that can overcome the shortcomings of prior art.

[0065] The present invention provides a scanning device for a scanning display, wherein the scanning display includes a common cathode light-emitting diode array and multiple scan lines, and the scanning device for the scanning display includes multiple scanning circuits, each scanning circuit including a voltage generator and a detector.

[0066] The voltage generator has an output terminal electrically connected to a corresponding scan line in the scan lines, and is controlled by the output terminal to generate one of a reference voltage and a clamping voltage to the corresponding scan line.

[0067] 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. Based on the voltage at the output terminal and the detection timing signal, it generates a detection result indicating whether the corresponding scan line is abnormal.

[0068] The scanning device of the scanning display of the present invention includes, in each scanning circuit, a detector comprising,

[0069] The comparison unit has a first input terminal electrically connected to the output terminal of the voltage generator to receive the voltage of the output terminal, a second input terminal to receive a predetermined reference voltage, and an output terminal providing a comparison result between the voltage of the output terminal and the predetermined reference voltage.

[0070] A logic gate has a first input terminal electrically connected to the comparison unit to receive the comparison result, a second input terminal to receive the detection timing signal, and an output terminal, wherein the logic gate generates the detection result at its output terminal based on the comparison result and the detection timing signal.

[0071] The scanning device of the scanning display of the present invention includes, in each scanning circuit, a voltage generator comprising,

[0072] A scan switch has a first terminal for receiving the reference voltage and a second terminal electrically connected to the output terminal of the voltage generator. The scan switch is controlled by a scan signal to be turned on or off, and when turned on, it outputs the reference voltage to the corresponding scan line.

[0073] A voltage regulator is used to generate the clamped voltage, and

[0074] A clamping switch has a first terminal electrically connected to the voltage regulator to receive the clamping voltage, and a second terminal electrically connected to the output terminal of the voltage generator. The clamping switch is controlled by a clamping signal to be turned on or off, and when turned on, it outputs the clamping voltage to the corresponding scan line.

[0075] The scanning device of the scanning display of the present invention further includes:

[0076] The controller is electrically connected to the scan switch and clamp switch of the detector and voltage generator of each scan circuit. It receives and outputs the detection results from the detector, 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. The clamp signals change with the change of the detection results.

[0077] The beneficial effect of this invention is that by using each detector to detect the output terminal of each voltage generator, it is possible to know 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. Attached Figure Description

[0078] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, wherein:

[0079] Figure 1 This is a circuit block diagram illustrating a first embodiment of the scanning display with short-circuit detection function of the present invention;

[0080] Figure 2 This is a circuit block diagram illustrating a scanning device according to the first embodiment;

[0081] Figures 3 to 11 This illustrates various implementations of the first embodiment where multiple detection results are transmitted to the corresponding controllers via different transmission paths.

[0082] Figure 12 It is a timing diagram illustrating multiple scan signals, multiple clamping signals, multiple detection timing signals, a data signal, and a voltage at an output terminal in the first embodiment;

[0083] Figure 13 It is a timing diagram illustrating the scan signal, the clamping signal, the data signal, and the voltage at the output terminal in the first embodiment;

[0084] Figure 14 This is a circuit block diagram illustrating a second embodiment of the scanning display with short-circuit detection function of the present invention;

[0085] Figure 15 This is a circuit block diagram illustrating a scanning device of a second embodiment of the scanning display with short-circuit detection function according to the present invention; and

[0086] Figure 16 It is a timing diagram illustrating multiple scan signals, multiple clamping signals, and a switching signal in the second embodiment. Detailed Implementation

[0087] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.

[0088] <First Embodiment>

[0089] See Figure 1 and Figure 2 The scanning display with short-circuit detection function of the present invention includes a display device 1, a scanning device 2, a data device 3, a control device 4 and other necessary components (not shown).

[0090] The display device 1 includes a common cathode light-emitting diode (LED) array 11. The LED array 11 includes multiple scan lines 111, multiple data lines 112, and multiple LEDs 113.

[0091] The scan lines 111 are arranged along a row direction. The data lines 112 are arranged perpendicular to the scan lines 111 along a column direction. The LEDs 113 are respectively arranged in the matrix defined by the scan lines 111 and the data lines 112. Each LED 113 has a cathode of the scan line 111 corresponding to it and an anode of the data line 112 corresponding to it.

[0092] The scanning device 2 includes N scanning circuits 21 and a controller 22, where N is a positive integer. In this embodiment, each scanning circuit 21 includes a voltage generator 211 and a detector 212.

[0093] The voltage generator 211 has an output terminal Q1 electrically connected to a corresponding scan line 111 of the scan lines 111, and is controlled by the output terminal Q1 to generate either a reference voltage or a clamping voltage Vc to the corresponding scan line 111. In this embodiment, the reference voltage is a ground voltage (GND). The clamping 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 will not be described in detail here for the sake of brevity. The voltage generator 211 of each scan circuit 21 includes a scan switch 213, a regulator 214 for generating the clamping voltage Vc, and a clamping switch 215.

[0094] The scan switch 213 has a first terminal for receiving the reference voltage and a second terminal electrically connected to the output terminal Q1 of the voltage generator 211. The scan switch 213 is controlled by a scan signal SCj to be either turned on or off, and when turned on, it outputs the reference voltage to the corresponding scan line 111, where j is a positive integer, 0 < j ≦ N. Further, the scan switch 213 of the first scan circuit 21 is controlled by the scan signal SC1, the scan switch 213 of the second scan circuit 21 is controlled by the scan signal SC2, and so on.

[0095] The clamping switch 215 has a first terminal electrically connected to the voltage regulator 214 to receive the clamped voltage Vc, and a second terminal electrically connected to the output terminal Q1 of the voltage generator 211. The clamping switch 215 is controlled by a clamping signal CSj to be either turned on or off, and when turned on, it outputs the clamped voltage Vc to the corresponding scan line 111. Further, the clamping switch 215 of the first scan circuit 21 is controlled by the clamping signal CS1, the clamping switch 215 of the second scan circuit 21 is controlled by the clamping signal CS2, and so on.

[0096] The detector 212 receives a detection timing signal DTj and is electrically connected to the output terminal Q1 of the voltage generator 211 to detect the voltage at the output terminal Q1. Based on the voltage at the output terminal Q1 and the detection timing signal DTj, it generates a detection result Drj indicating whether the corresponding scan line 111 is abnormal. Specifically, when each LED 113 connected to the corresponding scan line 111 electrically connected to the scanning circuit 21 is not short-circuited, the voltage at the output terminal Q1 will not be abnormally low for a short period, and thus the corresponding scan line 111 is not in an abnormal state. When any LED 113 connected to the corresponding scan line 111 electrically connected to the scanning circuit 21 is short-circuited, the voltage at the output terminal Q1 will be abnormally low for a short period, causing the corresponding scan line 111 to be in an abnormal state. In this embodiment, the detector 212 of each scanning circuit 21 includes a comparison unit 216 and a logic gate 217.

[0097] The comparison unit 216 has a first input terminal electrically connected to the output terminal Q1 of the voltage generator 211 to receive the voltage of the output terminal Q1, a second input terminal to receive a predetermined reference voltage Vr, and an output terminal providing a comparison result Cr between the voltage of the output terminal Q1 and the predetermined reference voltage Vr.

[0098] The logic gate 217 has a first input terminal electrically connected to the comparison unit 216 to receive the comparison result Cr, a second input terminal to receive the detection timing signal DTj, and an output terminal. The logic gate generates the detection result Drj at its output terminal based on the comparison result Cr and the detection timing signal DTj. In this embodiment, the logic gate 217 is an AND gate, but it is not limited thereto.

[0099] The controller 22 is electrically connected to the detector 212 and the scan switch 213 and clamp switch 215 of the voltage generator 211 in each scanning circuit 21. It receives and outputs the detection results Dr1 to Drj from the detectors 212, and generates and outputs the detection timing signal DTj required by each detector 212, the scan signal SCj required by each scan switch 213, and the clamp signal CSj required by each clamp switch 215. The clamp signals CS1 to CSj change according to the detection results Dr1 to Drj. It should be noted that, as... Figure 2 As shown, the controller 22 adjusts and generates the clamping signals CS1 to CSj respectively based on the detection results Dr1 to Drj from the detector 212 (supplementary explanation, in Figure 2In this illustration, only the j-th scanning circuit 21 is shown for clarity to avoid clutter, but it is not limited thereto. The controller 22 can also adjust and generate the corresponding clamping signal based on 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. Furthermore, the control device 4 can be operated to generate the relevant parameter settings and grayscale data required for the normal display of the scanning 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 this invention, its details are omitted here.

[0100] For details, please refer to Figures 3 to 5 This describes how the controller 22 generates different implementations of the corresponding clamping signal based on the detection results from the data device 3.

[0101] See Figure 1 and Figure 3 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 (not shown). The data device 3 is used to receive an input voltage Vin and 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 generates multiple data signals VD1 to VDj according to the input voltage Vin and provides them to the data line 112 respectively. It also receives detection results Dr1 to Drj from the controller 22 to determine whether the corresponding scanning line 111 is abnormal, 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 data device 3.

[0102] See Figure 4 and Figure 5 The present invention, a scanning display with short-circuit detection function, includes a plurality of display devices 1, a plurality of scanning devices 2, a plurality of data devices 3 connected in series, and a control device 4 (not shown). Each scanning device 2 is electrically connected to its corresponding display device 1. Each data device 3 is electrically connected to its corresponding display device 1. Figure 4In this configuration, the scanning devices 2 are connected in series. The first data device 3 (i.e., the one of the data devices 3 closest to the scanning device 2) is electrically connected to the controller 22 of the first scanning device 2. The last data device 3 (i.e., the second data device 3) is electrically connected to the controller 22 of the second scanning device 2. The second scanning device 2 transmits the detection results Dr1' to Drj' output by its own controller 22 to the first scanning device 2. The first 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 second 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' to the controller 22 of the second scanning device 2 via the second data device 3 (that is, all the detection results are transmitted sequentially via the second data device to the last data device to the controller of at least one of the scanning devices). The second scanning device 2 transmits the detection results Dr1~Drj to the controller 22 of the first scanning device 2, so that the controller 22 adjusts and generates the corresponding clamping signal according to the corresponding detection result. Figure 5 and Figure 4 Similar, the difference between the two lies in, Figure 5 In this configuration, the scanning devices 2 are not connected in series. The controller 22 of each scanning device 2 is electrically connected to the first data device 3 and the last data device 3. Each scanning device 2 transmits the detection results Dr1-Drj and Dr1'-Drj' to the first data device 3. The first data device 3 transmits the detection results Dr1-Drj and Dr1'-Drj' to the controller 22 of the scanning device 2 via the second data device 3, so that each controller 22 adjusts and generates a corresponding clamping signal based on the corresponding detection result.

[0103] See Figures 6 to 8 This describes how the controller 22 generates different implementations of the corresponding clamping signal based on the detection results from the control device 4.

[0104] See Figure 6 , Figure 6 and Figure 3 Similar, the difference between the two lies in, Figure 6In this configuration, the data device 3 is not electrically connected to the controller 22 of the scanning device 2, but is electrically connected to the controller 22 of the scanning device 2 by the control device 4. The control device 4 receives detection results Dr1 to Drj from the controller 22 to determine whether the corresponding scan line 111 is abnormal, 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 based on the detection results Dr1 to Drj from the control device 4.

[0105] See Figure 7 , Figure 7 and Figure 6 Similar, the difference between the two lies in, Figure 7 The scanning display includes multiple display devices 1, multiple scanning devices 2 connected in sequence, and multiple data devices 3 not connected in sequence. The controller 22 of the second scanning device 2 is electrically connected to the control device 4. The second scanning device 2 transmits the detection results Dr1' to Drj' output by its own controller 22 to the first scanning device 2. The first 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 second scanning device 2, to the control device 4. The control device 4 receives all the detection results Dr1~Drj and Dr1'~Drj', and transmits the detection results Dr1~Drj and Dr1'~Drj' to the controller 22 of the second scanning device 2. The second scanning device 2 also transmits the detection results Dr1~Drj to the controller 22 of the first scanning device 2, so that the controller 22 adjusts and generates the corresponding clamping signal according to the corresponding detection result.

[0106] Further reading Figure 8 , Figure 8 and Figure 7 Similar, the difference between the two lies in, Figure 8 In this configuration, 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 controller 22 of each scanning device 2 transmits the detection results Dr1 to Drj and the detection results Dr1' to Drj' to the control device 4, respectively. The control device 4 transmits the detection results Dr1 to Drj and Dr1' to Drj' to the controller 22 of each scanning device 2, so that each controller 22 adjusts and generates the corresponding clamping signal according to the corresponding detection result.

[0107] See Figures 9 to 11This describes how the controller 22 generates different implementations of the corresponding clamping signal based on the detection results received from the data device 3 and the control device 4.

[0108] See Figure 9 In 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.

[0109] See Figure 10 , Figure 11 The scanning display with short-circuit detection function of the present invention includes a plurality of display devices 1, 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 first 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 second scanning device 2. The second scanning device 2 transmits the detection results Dr1' to Drj' output by its own controller 22 to the first scanning device 2. The first 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 second 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 second scanning device 2. The second scanning device 2 transmits the detection results Dr1~Drj to the controller 22 of the first 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 this configuration, the scanning devices 2 are not connected in series. The data device 3 is electrically connected between the controller 22 of the 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 scanning device 2. The controller 22 transmits the detection results Dr1~Drj and Dr1'~Drj' to the first data device 3, respectively. The first data device 3 transmits the detection results Dr1~Drj and Dr1'~Drj' to the control device 4 via the second data device 3. The control device 4 transmits the detection results Dr1~Drj and Dr1'~Drj' to the controller 22 of each scanning device 2, so that each controller 22 adjusts and generates the corresponding clamping signal according to the corresponding detection result.

[0110] See Figure 12 This is a timing diagram. The following example illustrates the first embodiment, which has only one display device 1, one scanning device 2, one data device 3, and N=4 (i.e., the display device 1 includes four scan lines 111, four data lines 112, and sixteen LED units 113; the scanning device 2 includes four scanning circuits 21). The controller 22 directly generates clamping signals CS1-CS4 based on the detection results Dr1-Dr4 from the detector 212. However, this is not limited to this example. The four scan signals CS1-CS4, the four clamping signals CS1-CS4, and the four detection timing signals DT1-DT4 are explained. Simultaneously, the example of a short circuit occurring in one LED 113 electrically connected to the corresponding scan line 111 of the second scanning circuit 21 is illustrated. However, this is not limited to this example. The data signal VD2 and the voltage NV at the output terminal Q1 when each LED 113 electrically connected to the corresponding scan line 111 of the second scanning circuit 21 is not short-circuited are explained. Q1 And the voltage SV at the output terminal Q1 when the LED 113 electrically connected to the corresponding scan line 111 is short-circuited. Q1 .

[0111] In detail, a scan cycle T of each scan circuit 21 includes a scan interval Si and a clamping interval Ci. When each LED 113 electrically connected to the corresponding scan line 111 electrically connected to each scan circuit 21 is not short-circuited, the clamping interval Ci has N-1 (i.e., N-1 = 4-1 = 3) first clamping time periods C1. Each first clamping time period C1 has a delay time t1 and a clamping conduction time t2. In each scan circuit 21, in the scan interval Si, the scan signal SCj (i.e., one of the scan signals SC1 to SC4) has a conduction level (i.e., logic "1"), and the clamping signal CSj (i.e., one of the clamping signals CS1 to CS4) has a non-conducting level (i.e., logic "0"). In the clamping interval Ci, the scanning signal SCj has the non-conducting level, and in the delay time t1 of each first clamping period C1, the clamping signal CSj has the non-conducting level, and in the clamping conduction time t2 of each first clamping period C1, the clamping signal CSj has the conducting level. In each scanning circuit 21, in the scanning interval Si, in the first first clamping period C1 of the clamping interval Ci (i.e., the first clamping period C1 closest to the scanning interval Si in the first clamping period C1), and in each clamping conduction time t2 of the second to N-1th (i.e., N-1 = 4-1 = 3) first clamping period C1, the corresponding detection timing signal DTj (i.e., one of the detection timing signals DT1 to DT4) has a non-detection level. In each delay time t1 of the second to N-1th (i.e., N-1 = 4-1 = 3) first clamping period C1 of the clamping interval Ci, the corresponding detection timing signal DTj has a detection level. Furthermore, in two adjacent scanning circuits 21, the end point of the conduction level of the scanning signal SCj of the preceding scanning circuit 21 corresponds to the start point of the conduction level of the scanning signal SCj of the next scanning circuit 21. The end point of the first first clamping period C1 of the clamping interval Ci of the preceding scanning circuit 21 in the scanning period T corresponds to the end point of the conduction level of the scanning signal SCj of the next scanning circuit 21. The second to N-1th first clamping period C1 of the clamping interval Ci of the preceding scanning circuit 21 in the scanning period T respectively correspond to the first to N-2th (i.e., N-2 = 4-2 = 2) first clamping period C1 of the next scanning circuit 21.

[0112] In this case, when the LED 113 electrically connected to the corresponding scan line 111 is short-circuited, when the corresponding detection timing signal DTj has the detection level, the detection result Drj generated by the corresponding detector 212 has a high logic level "1" to indicate that the corresponding scan line 111 is abnormal. The following is a detailed explanation using the example of the LED 113 electrically connected to the corresponding scan line 111 of the second scan circuit 21 being short-circuited. When the LED 113 corresponding to the second scan circuit 21 is short-circuited, when the scan signal SC2 and the clamping signal CS2 have the non-conducting level, the voltage of the output terminal Q1 of the second scan circuit 21 is abnormally pulled low for a short time due to the influence of the corresponding data signal VD2 (e.g., ...). Figure 12 The voltage SV at the output terminal Q1 Q1 As shown), in this way, the comparison unit 216 of the second scanning circuit 21 compares the voltage SV at the output terminal Q1. Q1 The comparison result Cr generated by the predetermined reference voltage Vr has the high logic level, such that when the detection timing signal DT2 has the detection level, the detector 212 of the second scan circuit 21 determines the voltage SV of the output terminal Q1. Q1 The detection result Dr2 generated by the detection timing signal DT2 has a high logic level, which indicates that an abnormality has occurred in the corresponding scan line 111. Similarly, the operation of the remaining scan circuits 21 is as described above.

[0113] Further reading Figure 13In each scanning circuit 21, when the detection result Drj indicates that the corresponding scan line 111 is abnormal, the controller 22 adjusts the corresponding clamping signal CSj according to the detection result Drj, so that the clamping interval Ci of the scanning circuit 21 corresponding to the abnormal scan line 111 changes from having three first clamping periods C1 to having a second clamping period C2, a third clamping period C3, and a fourth clamping period C4. Specifically, when the corresponding scan line 111 is abnormal, in the scanning interval Si, the scanning signal SCj has the on level, and the clamping signal CSj has the off level. During the clamping interval Ci, the scan signal SCj has the non-conducting level; during the second clamping period C2 and the fourth clamping period C4, the clamping signal CSj has the non-conducting level; and during the third clamping period C3, the clamping signal CSj has the conducting level. The duration of the third clamping period C3 is less than the clamping conduction time t2 of the first clamping period C1. Similarly, the following description uses the example of a short circuit in the LED 113 electrically connected to the corresponding scan line 111 electrically connected to the second scan circuit 21. During the scan interval Si, the scan signal SC2 has the conducting level, and the clamping signal CS2 has the non-conducting level. During the clamping interval Ci, the scan signal SC2 has the non-conducting level; during the second clamping period C2 and the fourth clamping period C4, the clamping signal CS2 has the non-conducting level; and during the third clamping period C3, the clamping signal CS2 has the conducting level. Therefore, the voltage at the output terminal Q1 becomes as follows: Figure 13 voltage SV Q1 As shown in the diagram, during the fourth clamping period C4 of each scan cycle T of the second scanning circuit 21, due to the short circuit of the corresponding LED 113 and the non-conducting level of the scan signal SC2 and the clamping signal CS2, the voltage SV of the output terminal Q1 is reduced. Q1 The voltage of the output terminal Q1 is approximately equal to the voltage of the data signal VD2 due to the influence of the data signal VD2. Q1 'The voltage of the corresponding data line 112 will not be affected by the clamping voltage Vc, so that the multiple LEDs 113 of the data line 112 corresponding to the data signal VD2 will not be constantly lit or constantly dim, thereby avoiding the short circuit caterpillar phenomenon.'

[0114] <Second Embodiment>

[0115] See Figure 14 , Figure 15A second embodiment of the scanning display with short-circuit detection function of the present invention is a modification of the first embodiment. The difference 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 terminal of the logic gate 217 of each scanning circuit 21, so that the controller 22 will not adjust the corresponding clamping signal CSj according to the detection result Drj, so that the clamping signals CS1 to CSj will not change with the change of the detection results Dr1 to Drj; in each scanning circuit 21, the voltage regulator 214 The detector 212 is also electrically connected to the output of the logic gate 217 to receive the detection result Drj and generate a switching signal based on the detection result Drj. In each scanning circuit 21, the voltage generator 211 further includes a switching switch 218, which has a first terminal electrically connected to the voltage regulator 214 to receive the clamping voltage Vc, a second terminal electrically connected to the first terminal of the clamping switch 215, and a control terminal electrically connected to the voltage regulator 214 to receive the switching signal. The switching switch 218 is controlled by the switching signal to be turned on or off.

[0116] In the second embodiment, regardless of whether each LED 113 electrically connected to the corresponding scan line 111 electrically connected to each scan circuit 21 is short-circuited, the four scan signals SC1~SC4, the four clamping signals CS1~CS4, and the four detection timing signals DT1~DT4 are respectively as follows: Figure 12 The four scanning signals SC1 to SC4, the four clamping signals CS1 to CS4, and the four detection timing signals DT1 to DT4 are shown.

[0117] Further reading Figure 16 This indicates that when each LED 113 connected to the corresponding scan line 111 of each scan circuit 21 is not short-circuited, the voltage regulator 214 generates a switching signal based on the detection result Drj as follows: Figure 16 As shown in the signal NSw, and when an LED 113 electrically connected to the corresponding scan line 111 is short-circuited, the voltage regulator 214 generates a switching signal based on the detection result Drj, as shown in the following... Figure 16The signal SSw is shown below. In each scanning circuit 21, during the scanning period T, when each LED 113 electrically connected to the corresponding scan line 111 electrically connected to the scanning circuit 21 is not short-circuited, the switching signal NSw only has the on level. When the detection result Drj indicates that the corresponding scan line 111 is abnormal, the switching signal SSw is maintained at the on level for only one on time t3. Similarly, the following description uses the example of LED 113 electrically connected to the corresponding scan line 111 electrically connected to the second scanning circuit 21 being short-circuited and not short-circuited. During the scanning period T, when each LED 113 electrically connected to the corresponding scan line 111 electrically connected to the second scanning circuit 21 is not short-circuited, the switching signal NSw only has the on level. When the detection result Dr2 indicates that the corresponding scan line 111 is abnormal, the regulator 214 adjusts the switching signal NSw to the switching signal SSw, and the switching signal SSw is maintained at the on level for only the on time t3. The conduction time t3 corresponds to a portion of the clamping conduction time t2 of the first clamping period C1 of the clamping interval Ci of the second scanning circuit 21, where the detection result Dr2 indicates an abnormality (i.e., the duration of the conduction time t3 is less than the clamping conduction time t2). Thus, in the second embodiment, as in the first embodiment, during a clamping period C5 of each scanning cycle T of the second scanning circuit 21, due to the short circuit of the corresponding LED 113 and the non-conducting level of the scanning signal SC2 and the switching signal SSw, the voltage of the output terminal Q1 is affected by the data signal VD2 and approximates the voltage of the data signal VD2. Furthermore, the voltage of the output terminal Q1 is not affected by the clamping voltage Vc, so that the multiple LEDs 113 of the data line 112 corresponding to the data signal VD2 will not be constantly lit or constantly dim, thus also avoiding the short-circuit caterpillar phenomenon.

[0118] In summary, the scanning display with short-circuit detection function of the present invention uses each detector 212 to detect the output terminal Q1 of each voltage generator 211 and transmits the detection result Drj to the corresponding controller 22 (or the detection result Drj is transmitted to the corresponding voltage regulator 214), so that each controller 22 (or each voltage regulator 214) can know whether the corresponding scan line 111 is abnormal due to the short circuit of LED 113, and adjust the corresponding clamping signal CSj accordingly (or adjust the corresponding switching signal NSw to the switching signal SSw). In this way, the voltage of the corresponding output terminal Q1 will not be affected by the clamping voltage Vc due to the short circuit of any corresponding LED 113, so that the LED 113 of the data line 112 of the corresponding data signal VDj will not be constantly lit or constantly dim, thereby avoiding the short-circuit caterpillar phenomenon. In addition, the scanning device 2 transmits the detection results Dr1 to Drj to the data device 3 or the control device 4 to notify the data device 3 or the control device 4 so that they know whether there is an abnormality in the scan line 111, thus the scanning device 2 has the function of notification.

[0119] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A scanning display with short-circuit detection function, characterized in that, A display device comprising: a light emitting diode array of a common cathode architecture, the light emitting diode array 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 light emitting diode having a cathode electrically connected to a corresponding scan line and an anode 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 a reference voltage and a clamp voltage to the corresponding scan line at the output, 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; in each scan circuit, the voltage generator comprising, a scan switch having a first terminal for receiving the reference voltage and a second terminal electrically connected to the output of the voltage generator, the scan switch being controlled to be conductive or non-conductive by a scan signal and, when conductive, outputting the reference voltage to the corresponding scan line, 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 of the voltage generator, the clamp switch being controlled to be conductive or non-conductive by a clamp signal and, when conductive, outputting the clamp voltage to the corresponding scan line; the number of scan circuits being N, N being a positive integer, a scan period of each scan circuit comprising a scan interval and a clamp interval, the clamp interval having N-1 first clamp periods each having a delay time and a clamp-on time when each light emitting diode electrically connected to the corresponding scan line electrically connected to the scan circuit is not short-circuited, the detection timing signal having a detection level in each delay time of the second to the N-1th first clamp periods of the clamp interval; in each scan circuit, when the detection result indicates that the corresponding scan line is abnormal, the clamp interval having 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 having a conductive level and the clamp signal having a non-conductive level, in the clamp interval, the scan signal having the non-conductive level, in the second clamp period and the fourth clamp period, the clamp signal having the non-conductive level, and in the third clamp period, the clamp signal having the conductive level and the duration of the third clamp period being 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 comprising, 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 scanning device further comprises a controller electrically connected to the detectors of each scanning 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 with the change of the detection result.

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

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

6. The short-circuit detecting function-equipped scanning display according to claim 3, wherein Further comprising: a data device for receiving an input voltage, and electrically connected to the data lines of the display device and the controller of the scanning device, and 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; a plurality of the scanning devices, each scanning device being electrically connected to the corresponding display device; and A plurality of sequentially connected data devices, each of which is electrically connected to a corresponding one of the display devices, and a last one of the data devices is further electrically connected to a controller of at least one of the scanning devices, a first one of the data devices receives detection results of all of the scanning devices, and sequentially transmits the detection results to the controller of the at least one of the scanning devices via a second one of the data devices 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; 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, and a last one of the data devices is further electrically connected to the control device, a first one of the data devices receives detection results of all of the scanning devices, and sequentially transmits the detection results to the control device via a second one of the data devices 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 in that Comprising: a display device comprising an array of light emitting diodes in a common cathode 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 a cathode electrically connected to a corresponding one of the scan lines, and an anode 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 a reference 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; in each of the scanning circuits, the voltage generator comprises, a scan switch having a first terminal for receiving the reference voltage, and a second terminal electrically connected to an output terminal of the voltage generator, the scan switch being controlled to be turned on or off by a scan signal, and outputting the reference voltage to the corresponding scan line when turned on, 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 turned on or off by a clamp signal, and outputting the clamp voltage to the corresponding scan line when turned on; 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 turned on or off by the switching signal; the number of the scan circuits is N, N is a positive integer, a scan period 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 on time, in each delay time of the second to the N-1 first clamp periods of the clamp interval, the detection timing signal has a detection level, and 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 switching signal has a turn-on level, in each scan circuit, in the scan period, when the detection result indicates that the corresponding scan line is abnormal, the switching signal is maintained at the turn-on level only for a turn-on time, the turn-on time corresponds to a part of the clamp on 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 signal required by each detector, the scan signal required by each scan switch, and the clamp signal 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 a turn-on level, the clamp signal has a turn-off level, 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 on time of each first clamp period, the clamp signal has the turn-on 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 a common cathode architecture and a plurality of scanning 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 one of the scan lines, and controlled to generate one of a reference 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 generate a detection result indicating whether the corresponding scan line is abnormal according to the voltage of the output end and the detection timing signal; in each of the scanning circuits, the voltage generator comprises, a scan switch having a first end for receiving the reference voltage, and a second end electrically connected to the output end of the voltage generator, the scan switch being controlled to be conductive or non-conductive by a scan signal and outputting the reference voltage to the corresponding scan line when conductive, a voltage stabilizer for generating the clamp voltage, and a clamp switch having a first end electrically connected to the voltage stabilizer for receiving the clamp voltage, and a second end electrically connected to the output end 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, the number of scanning circuits is N, N is a positive integer, a scan period of each scanning circuit comprises a scan interval and a clamp interval, when each light-emitting diode electrically connected to the corresponding scan line electrically connected to 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 conductive time, in each delay time of the second to N-1th first-clamp periods of the clamp interval, the detection timing signal has a detection level; 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 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 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 conductive 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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