Scanning display and its data device with short-circuit detection function

Abstract

A scanning display with short-circuit detection capability includes: a display device comprising a common-cathode light-emitting diode array including multiple scan lines and multiple data lines; and a data device including multiple driving units. Each driving unit includes a current driving circuit and a detection circuit. The current driving circuit has an output terminal electrically connected to a corresponding data line among the data lines, and is controlled by a pulse width control signal to generate one of a driving current and a first clamping voltage at the output terminal and output it to the corresponding data line. The detection circuit detects the voltage at the output terminal of the current driving circuit and generates a detection result indicating whether the corresponding data 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 data 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 the corresponding LED string in the same column to remain constantly lit. Similarly, a constant-off caterpillar phenomenon occurs when a short circuit in one LED causes the corresponding LED string in the same column to remain constantly dark. The corresponding LED string in the same column is defined as the 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 data 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 data device includes multiple drive units, each of which includes a current drive circuit and a detection circuit.

[0010] The current drive circuit has an output terminal electrically connected to a corresponding data line among the data lines, and is controlled by a pulse width control signal to generate one of a drive current and a first clamping voltage at the output terminal and output to the corresponding data line.

[0011] The detection circuit receives a detection timing signal and detects the voltage at the output terminal of the current drive circuit. Based on the voltage at the output terminal and the detection timing signal, it generates a detection result indicating whether the corresponding data line is abnormal.

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

[0013] The comparator has a first input terminal for detecting the voltage at the output terminal of the current drive circuit, a second input terminal for receiving a predetermined reference voltage, and an output terminal for providing a comparison result between the output voltage and the predetermined reference voltage.

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

[0015] The scanning display with short-circuit detection function of the present invention, in each driving unit, the detection circuit is electrically connected to the output terminal of the current driving circuit to detect the voltage of the output terminal, and the current driving circuit includes,

[0016] The voltage regulator generates this first clamping voltage.

[0017] An inverter receives the pulse width control signal and generates an inverted signal based on the pulse width control signal.

[0018] A constant current circuit is used to receive an input voltage and generate a drive current based on that input voltage.

[0019] A first switch has a first terminal electrically connected to the output terminal of the current drive circuit, and a second terminal electrically connected to the constant current device to receive the drive current. The first switch is controlled by the pulse width control signal to either turn on or off, and when on, outputs the drive current to the corresponding data line.

[0020] The second switch has a first terminal electrically connected to the voltage regulator to receive the first clamping voltage, and a second terminal electrically connected to the output terminal of the current drive circuit. The second switch is controlled by the inverting signal to be turned on or off, and when turned on, it outputs the first clamping voltage to the corresponding data line.

[0021] The scanning display with short-circuit detection function of the present invention includes, in each driving unit, a current driving circuit comprising,

[0022] The voltage regulator generates this first clamping voltage.

[0023] An inverter receives the pulse width control signal and generates an inverted signal based on the pulse width control signal.

[0024] A constant current circuit is used to receive an input voltage and is electrically connected to the detection circuit, and generates the drive current based on the input voltage.

[0025] A first switch has a first terminal electrically connected to the output terminal of the current drive circuit, and a second terminal electrically connected to the detection circuit and the constant current device, receiving the drive current. The first switch is controlled by the pulse width control signal to either turn on or off. When the first switch is on, it outputs the drive current to the corresponding data line, and the detection circuit detects the voltage at the output terminal of the current drive circuit via the first switch.

[0026] The second switch has a first terminal electrically connected to the voltage regulator to receive the first clamping voltage, and a second terminal electrically connected to the output terminal of the current drive circuit. The second switch is controlled by the inverting signal to be turned on or off, and when turned on, it outputs the first clamping voltage to the corresponding data line.

[0027] The scanning display with short-circuit detection function of the present invention further includes a scanning device, the scanning device comprising...

[0028] The scanning control unit generates multiple scanning signals and multiple clamping signals, receives the detection results, and determines whether to adjust the clamping signal corresponding to the current row scan based on the detection results.

[0029] Multiple scanning units, each receiving a reference voltage, are electrically connected to the scan lines and to the scan control unit to receive a corresponding scan signal from the scan signals and a corresponding clamping signal from the clamping signals. Each scanning unit determines whether to output the reference voltage based on the corresponding scan signal in the scan signals and whether to output a second clamping voltage based on the corresponding clamping signal in the clamping signals. Each scanning unit outputs one of the reference voltage and the second clamping voltage to a corresponding scan line in the scan lines.

[0030] The scanning display with short-circuit detection function of the present invention includes, in each scanning unit,

[0031] A scan switch has a first terminal for receiving the reference voltage and a second terminal electrically connected to the corresponding scan line in the scan lines. The scan switch is controlled to be turned on or off by the corresponding scan signal in the scan signal, and when turned on, the reference voltage is output to the corresponding scan line via the second terminal of the scan switch.

[0032] The voltage regulator generates the second clamping voltage, and

[0033] A clamping switch has a first terminal electrically connected to the voltage regulator to receive the second clamping voltage, and a second terminal electrically connected to the second terminal of the scan switch. The clamping switch is controlled by the corresponding clamping signal in the clamping signal to be turned on or off, and when turned on, outputs the second clamping voltage to the corresponding scan line through the second terminal of the scan switch. The on-time of the clamping switch is different from the on-time of the scan switch.

[0034] The present invention includes a scanning display with short-circuit detection function, and the data device further includes,

[0035] The pulse width control unit is electrically connected to the scan control unit, the current drive circuit and the detection circuit of each drive unit, generates and outputs the pulse width control signal required by each current drive circuit and the detection timing signal required by each detection circuit, and receives the detection result from the detection circuit and outputs it to the scan control unit.

[0036] The present invention relates to a scanning display with short-circuit detection function.

[0037] The data device also includes a pulse width control unit electrically connected to the current drive circuit and the detection circuit of each drive unit, generating and outputting the pulse width control signal required by each current drive circuit and the detection timing signal required by each detection circuit.

[0038] The scanning control unit is electrically connected to the detection circuit of the drive unit to receive the detection results.

[0039] The scanning display with short-circuit detection function of the present invention includes a scanning interval and a clamping interval in one scanning cycle of each scanning unit. In the scanning cycle of each scanning unit,

[0040] The scanning signal and the clamping signal are complementary. During the scanning interval, the scanning signal has a conducting level; during the clamping interval, the scanning signal has a non-conducting level.

[0041] The detection timing signal has multiple detection levels, each corresponding to a scanning interval of the scanning unit. The duration of each detection level varies with a predetermined reference voltage, and the duration of each detection level is the same and shorter than that of each scanning interval.

[0042] In the scanning display with short-circuit detection function of the present invention, in two adjacent scanning units, the end point of the conduction level of the scanning signal of the previous scanning unit corresponds to the start point of the conduction level of the scanning signal of the next scanning unit.

[0043] In the scanning display with short-circuit detection function of the present invention, when one of the detection results indicates an abnormality in the corresponding data line, the scanning control unit adjusts the clamping signal corresponding to the current row scan in the clamping signal according to the detection result, such that in the scanning interval of the current row scan, the clamping signal corresponding to the current row scan is maintained at a non-conducting level, and in the clamping interval, the clamping signal corresponding to the current row scan has the conducting level for a clamping conducting time, the clamping conducting time being located in an initial period of the corresponding clamping interval.

[0044] The scanning display with short-circuit detection function of the present invention further includes:

[0045] Multiple display devices, electrically connected in a matrix arrangement; and

[0046] Multiple data devices are connected in series, each data device is electrically connected to its corresponding display device, and the last data device is also electrically connected to the scanning control unit of the scanning device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own detection results to the scanning control unit.

[0047] The scanning display with short-circuit detection function of the present invention further includes:

[0048] Multiple scanning devices, each of which is electrically connected to the corresponding display device;

[0049] The last data device is electrically connected to the scanning control unit of the scanning device, and the last data device transmits the received detection results and the detection results it generates to the scanning control unit of the scanning device.

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

[0051] Multiple display devices, electrically connected in a matrix arrangement; and

[0052] Multiple data devices are provided, each of which is electrically connected to the scanning control unit of the scanning device and the corresponding display device. Each data device transmits the generated detection results to the scanning control unit.

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

[0054] Multiple scanning devices, each of which is electrically connected to the corresponding display device;

[0055] Each data device is electrically connected to the scanning control unit of the scanning device and the corresponding display device, and each data device transmits the generated detection results to the scanning control unit.

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

[0057] Multiple such display devices are electrically connected in a matrix arrangement;

[0058] Multiple scanning devices, wherein the scanning control units of the scanning devices are connected in series, and each scanning device is electrically connected to its corresponding display device; and

[0059] Multiple data devices are connected in series. Each data device is electrically connected to its corresponding display device. The last data device is also electrically connected to the scanning control unit of the first scanning device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own generated detection results to the scanning control unit of the first scanning device. The scanning control unit of the i-th scanning device transmits the received detection results to the scanning control unit of the (i+1)-th scanning device, where i is a positive integer, 1 ≤ i ≤ N-1, and N is the total number of scanning devices.

[0060] The scanning display with short-circuit detection function of the present invention further includes:

[0061] Multiple such display devices are electrically connected in a matrix arrangement;

[0062] Multiple scanning devices, wherein the scanning control units of the scanning devices are connected in series, and each scanning device is electrically connected to its corresponding display device; and

[0063] Multiple data devices are provided, each of which is electrically connected to the corresponding display device and the scanning control unit of the first scanning device of the scanning device. Each data device transmits the generated detection result to the scanning control unit of the first scanning device. The scanning control unit of the i-th scanning device transmits the received detection result to the scanning control unit of the (i+1)-th scanning device, where i is a positive integer, 1 ≦ i ≦ N-1, and N is a total number of scanning devices.

[0064] The scanning display with short-circuit detection function of the present invention further includes:

[0065] Multiple such display devices are electrically connected in a matrix arrangement;

[0066] The control device, electrically connected to the scanning control unit of the scanning device; and

[0067] Multiple data devices are connected in series, each data device is electrically connected to its corresponding display device, and the last data device is also electrically connected to the control device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own detection results to the scanning control unit via the control device.

[0068] The scanning display with short-circuit detection function of the present invention further includes:

[0069] Multiple scanning devices, each of which is electrically connected to the corresponding display device;

[0070] The control device is electrically connected to the scanning control unit of each data device in the scanning device, and

[0071] The last data device transmits the received detection results and its own generated detection results to the scanning control unit of the scanning device via the control device.

[0072] The scanning display with short-circuit detection function of the present invention further includes:

[0073] Multiple such display devices are electrically connected in a matrix arrangement;

[0074] Multiple scanning devices are connected in series, and each scanning device is electrically connected to its corresponding display device.

[0075] Control device, a scanning control unit of the first scanning device electrically connected to the scanning device; and

[0076] Multiple data devices are connected in series. Each data device is electrically connected to its corresponding display device. The last data device is also electrically connected to the control device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own detection results to the scanning control unit of the first scanning device via the control device. The scanning control unit of the i-th scanning device transmits the received detection results to the scanning control unit of the (i+1)-th scanning device, where i is a positive integer, 1 ≤ i ≤ N-1, and N is the total number of scanning devices.

[0077] Another object of the present invention is to provide a data device for a scanning display that can overcome the shortcomings of prior art.

[0078] The present invention relates to a data device for a scanning display, the scanning display including a common cathode light-emitting diode array and multiple data lines, the data device for the scanning display including multiple driving units, each driving unit including a current driving circuit and a detection circuit.

[0079] The current drive circuit has an output terminal electrically connected to a corresponding data line among the data lines, and is controlled by a pulse width control signal to generate one of a drive current and a first clamping voltage at the output terminal and output to the corresponding data line.

[0080] The detection circuit receives a detection timing signal and detects the voltage at the output terminal of the current drive circuit. Based on the voltage at the output terminal and the detection timing signal, it generates a detection result indicating whether the corresponding data line is abnormal.

[0081] In the data device of the scanning display of the present invention, in each driving unit, the detection circuit includes,

[0082] The comparator has a first input terminal for detecting the voltage at the output terminal of the current drive circuit, a second input terminal for receiving a predetermined reference voltage, and an output terminal for providing a comparison result between the output voltage and the predetermined reference voltage.

[0083] A logic gate has a first input terminal electrically connected to the comparator to receive the comparison result, a second input terminal to receive the detection timing signal, and an output terminal. The logic gate generates the detection result at the output terminal of the logic gate based on the comparison result and the detection timing signal.

[0084] In the data device of the scanning display of the present invention, in each driving unit, the detection circuit is electrically connected to the output terminal of the current driving circuit to detect the voltage of the output terminal, and the current driving circuit includes,

[0085] The voltage regulator generates this first clamping voltage.

[0086] An inverter receives the pulse width control signal and generates an inverted signal based on the pulse width control signal.

[0087] A constant current circuit is used to receive an input voltage and generate a drive current based on that input voltage.

[0088] A first switch has a first terminal electrically connected to the output terminal of the current drive circuit, and a second terminal electrically connected to the constant current device to receive the drive current. The first switch is controlled by the pulse width control signal to either turn on or off, and when on, outputs the drive current to the corresponding data line.

[0089] The second switch has a first terminal electrically connected to the voltage regulator to receive the first clamping voltage, and a second terminal electrically connected to the output terminal of the current drive circuit. The second switch is controlled by the inverting signal to be turned on or off, and when turned on, it outputs the first clamping voltage to the corresponding data line.

[0090] The beneficial effect of this invention is that by using each detection circuit to detect the output terminal of each current drive circuit, it is possible to know in real time whether the corresponding data 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

[0091] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, wherein:

[0092] 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;

[0093] Figure 2 This is a circuit block diagram illustrating a scanning unit of the first embodiment;

[0094] Figure 3 This is a circuit block diagram illustrating a driving unit of the first embodiment;

[0095] Figure 4 It is a timing diagram illustrating multiple scan signals, multiple clamping signals, a detection timing signal, a pulse width control signal, a predetermined reference voltage, and the voltages at the output terminals of the scan unit and the drive unit in the first embodiment;

[0096] Figure 5 It is a timing diagram illustrating how the detection timing signal of the first embodiment changes with the change of the predetermined reference voltage;

[0097] Figure 6 It is a timing diagram illustrating the first embodiment detecting a short circuit and adjusting the scan signal, the clamping signal, and the voltage at the output terminals of the scan unit and the drive unit;

[0098] Figure 7 This is a circuit block diagram illustrating a second embodiment of a driving unit for a scanning display with short-circuit detection function according to the present invention; and

[0099] Figures 8 to 17 This illustrates various implementations of the first embodiment where multiple detection results are transmitted to the corresponding scanning control unit via different transmission paths. Detailed Implementation

[0100] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.

[0101] <First Embodiment>

[0102] See Figures 1 to 3 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 and other necessary components (not shown).

[0103] 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.

[0104] 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 an electrical connection and an anode of the data line 112 corresponding to an electrical connection.

[0105] The scanning device 2 includes multiple scanning units 21 and a scanning control unit 22. The scanning control unit 22 generates multiple scanning signals SC1-SCj and multiple clamping signals CS1-CSj. Each scanning unit 21 receives a reference voltage and is electrically connected to the scanning line 111, and is also electrically connected to the scanning control unit 22 to receive a corresponding scanning signal from the scanning signals SC1-SCj and a corresponding clamping signal from the clamping signals CS1-CSj. In this embodiment, the reference voltage is a ground voltage (GND). Each scanning unit 21 determines whether to output the reference voltage based on the corresponding scanning signal from the scanning signals SC1-SCj, and determines whether to output a second clamping voltage Vc2 based on the corresponding clamping signal from the clamping signals CS1-CSj. Each scanning unit 21 outputs one of the reference voltage and the second clamping voltage Vc2 to a corresponding scanning line 111 among the scanning lines 111. It should be further noted that the second clamping voltage Vc2 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 elaborated here for the sake of brevity. In this embodiment, each scanning unit 21 includes a scanning switch 211, a voltage regulator 212, and a clamping switch 213, and the detailed circuit connections of each scanning unit 21 are the same, so that... Figure 2 In order to avoid clutter in the diagram, only the j-th scanning unit 21 is shown for illustration, and the detailed circuit connection relationship of the j-th scanning unit 21 is explained.

[0106] The scan switch 211 has a first terminal for receiving the reference voltage and a second terminal electrically connected to the corresponding scan line 111 in the scan lines 111. The scan switch 211 is controlled by the scan signal SCj (i.e., the corresponding scan signal in the scan signals) to be turned on or off, and when turned on, the reference voltage is output to the corresponding scan line 111 via its second terminal.

[0107] The regulator 212 generates the second clamping voltage Vc2.

[0108] The clamp switch 213 has a first terminal electrically connected to the voltage regulator 212 to receive the second clamped voltage Vc2, and a second terminal electrically connected to the second terminal of the scan switch 211. The clamp switch 213 is controlled by the clamp signal CSj (i.e., the corresponding clamp signal in the clamp signals) to be turned on or off, and when turned on, outputs the second clamped voltage Vc2 to the corresponding scan line 111 via the second terminal of the scan switch 211. The on-time of the clamp switch 213 is different from the on-time of the scan switch 211.

[0109] The data device 3 includes multiple drive units 31 and a pulse width control unit 32. In this embodiment, each drive unit 31 includes a current drive circuit 311 and a detection circuit 312, and the detailed circuit connections of each drive unit 31 are identical. Figure 3 In order to avoid clutter in the diagram, only the j-th driving unit 31 is shown for illustration, and the detailed circuit connection relationship of the j-th driving unit 31 is explained.

[0110] The current drive circuit 311 has an output terminal Q1 electrically connected to one of the data lines 112. Controlled by a pulse width control signal Pcj, it generates and outputs either a drive current Id or a first clamping voltage Vc1 to the corresponding data line 112 at the output terminal Q1. In this embodiment, the current drive circuit 311 includes a voltage regulator 313, an inverter 314, a constant current circuit 315, and a first switch 316 and a second switch 317.

[0111] The regulator 313 generates the first clamping voltage Vc1. The constant current device 315 receives an input voltage Vin and generates the drive current Id based on the input voltage Vin.

[0112] The inverter 314 receives the pulse width control signal Pcj and generates an inverted signal Is based on the pulse width control signal Pcj.

[0113] The first switch 316 has a first terminal electrically connected to the output terminal Q1 of the current drive circuit 311, and a second terminal electrically connected to the constant current device 315 to receive the drive current Id. The first switch 316 is controlled by the pulse width control signal Pcj to be turned on or off, and when turned on, it outputs the drive current Id to the corresponding data line 112.

[0114] The second switch 317 has a first terminal electrically connected to the voltage regulator 313 to receive the first clamping voltage Vc1, and a second terminal electrically connected to the output terminal Q1 of the current drive circuit 311. The second switch 317 is controlled by the inverting signal Is to be turned on or off, and when turned on, it outputs the first clamping voltage Vc1 to the corresponding data line 112.

[0115] The detection circuit 312 receives a detection timing signal DTj and is electrically connected to the output terminal Q1 of the current drive circuit 311 to detect the voltage of the output terminal Q1. Based on the voltage of the output terminal Q1 and the detection timing signal DTj, a detection result indicating whether the corresponding data line 112 is abnormal is generated. Specifically, when each LED 113 electrically connected to the corresponding data line 112 is not short-circuited, the voltage of the output terminal Q1 is related to the first clamping voltage Vc1 and the driving current Id, and the corresponding data line 112 is in a normal state. When one of the LEDs 113 electrically connected to the corresponding data line 112 is short-circuited, the voltage of the output terminal Q1 is related to the reference voltage output by the scanning unit 21 corresponding to that LED 113 and the second clamping voltage Vc2, causing the voltage of the output terminal Q1 to be abnormally low for a short time, resulting in the corresponding data line 112 being in an abnormal state. In this embodiment, the detection circuit 312 includes a comparator 318 and a logic gate 319.

[0116] The comparator 318 has a first input terminal electrically connected to the output terminal Q1 of the current drive circuit 311 to detect the voltage of the output terminal Q1, a second input terminal receiving 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.

[0117] The logic gate 319 has a first input terminal electrically connected to the comparator 318 to receive the comparison result Cr, a second input terminal to receive the detection timing signal DTj, and an output terminal. The logic gate 319 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 319 is an AND gate, but it is not limited thereto.

[0118] The pulse width control unit 32 is electrically connected to the scan control unit 22, the current drive circuit 311 of the drive unit 31, and the detection circuit 312. It generates and outputs the pulse width control signals Pc1-Pcj required by the current drive circuit 311 and the detection timing signals DT1-DTj required by the detection circuit 312, respectively. It also receives the detection results Dr1-Drj from the detection circuit 312 and outputs them to the scan control unit 22. In this embodiment, the pulse width control signals Pc1-Pcj are the same, and the detection timing signals DT1-DTj are the same.

[0119] See Figure 4This is a timing diagram. Taking the scanning device 2 of the first embodiment, which includes four scanning units 21 and a scanning control unit 22 generating four scanning signals SC1-SC4 and four clamping signals CS1-CS4, as an example, but not limited to this, the diagram illustrates the changes of the four scanning signals SC1-SC4, the four clamping signals CS1-CS4, the pulse width control signal Pcj, and the detection timing signal DTj over time. Simultaneously, the voltage NV at the output terminal Q1 when each LED 113 is not short-circuited is also explained. Q1 Taking the short circuit of LED113 in the second row and second column of LED array 11 as an example, but not limited to this, it is explained that when LED113 in the second row and second column is short-circuited, the voltage SV of the corresponding output terminal Q1 is... Q1 The voltage Vsw2 is related to the second terminal of the scan switch 211 of the second scan unit 21. In this embodiment, the voltage NV of the output terminal Q1 is... Q1 The minimum voltage value is the first clamping voltage Vc1, and the voltage NV at the output terminal Q1 is... Q1 The maximum voltage value is the LED's on-state voltage.

[0120] In detail, each scanning period T of each scanning unit 21 includes a scanning interval Si and a clamping interval Ci. When each LED 113 is not short-circuited, in the scanning period T of each scanning unit 21, the scanning signal SCj and the clamping signal CSj are complementary (i.e., the scanning signals SC1 to SC4 are complementary to the clamping signals CS1 to CS4 respectively). In the scanning interval Si, the scanning signal SCj (i.e., one of the scanning signals SC1 to SC4) has a conducting level (i.e., logic "1"). In the clamping interval Ci, the scanning signal SCj has a non-conducting level (i.e., logic "0"). Furthermore, in two adjacent scanning units 21, the end point of the conducting level of the scanning signal of the previous scanning unit 21 corresponds to the start point of the conducting level of the scanning signal of the next scanning unit 21. For example, the end point of the conduction level of the scan signal SC1 of the first scan unit 21 corresponds to the start point of the conduction level of the scan signal SC2 of the second scan unit 21. In the scan period T of each scan unit 21, the detection timing signal DTj has four detection levels (i.e., logic "1"). These four detection levels correspond to the scan intervals Si of the four scan units 21, respectively. The duration of each detection level is the same and less than that of each scan interval Si. See further... Figure 4 and Figure 5 This indicates that the duration of each detection level of the detection timing signal DTj varies with the change of the predetermined reference voltage Vr.

[0121] In this case, when any LED 113 connected to any data line 112 is short-circuited, and the corresponding detection timing signal DTj has the detection level, the detection result Drj generated by the corresponding logic gate 319 has a high logic level "1" to indicate that the corresponding data line 112 is abnormal. The following is a detailed explanation using the example of the LED 113 in the second row and second column being short-circuited. When the LED 113 in the second row and second column is short-circuited, the voltage of the corresponding output terminal Q1 will change with the voltage of the second terminal of the scan switch 211 of the corresponding scan unit 21. Therefore, when the scan signal SC2 has the on level, the voltage of the corresponding output terminal Q1 is abnormally pulled down for a short time due to the influence of the reference voltage (e.g., Figure 4 , Figure 5 The voltage SV at the output terminal Q1 Q1 As shown), in this way, the comparator 318 of the driving unit 31 corresponding to the second column of the LED array 11 determines the voltage SV of the output terminal Q1 based on the voltage SV. Q1 The comparison result Cr generated by the predetermined reference voltage Vr has the high logic level, so that when the detection timing signal DT2 has the detection level, the logic gate 319 of the corresponding drive unit 31 has the high logic level based on the comparison result Cr and the detection timing signal DT2, and thus the scan control unit 22 can know that the corresponding data line 112 has an abnormality.

[0122] Further reading Figure 6In each drive unit 31, when one of the detection results Dr1 to Drj indicates an abnormality in the corresponding data line 112, the scan control unit 22 adjusts the clamping signal corresponding to the current line scan among the clamping signals CS1 to CSj according to the detection results Dr1 to Drj. The following explanation continues with the scenario where the detection result Dr2 has a high logic level and the display device 1 is currently scanning to the second line scan. When the detection result Dr2 among the detection results Dr1 to Drj has the high logic level, the scan control unit 22 adjusts the clamping signal CS2 corresponding to the current row scan among the clamping signals CS1 to CSj according to the detection result Dr2, so that in the scan interval Si of the current row scan, the clamping signal CS2 remains at the non-conducting level, and in the clamping interval Ci, the clamping signal CS2 has the conducting level for a clamping conducting time t1, which is located in an initial period of the corresponding clamping interval Ci. In this embodiment, a starting point of the clamping conducting time t1 is spaced apart from the ending point of the conducting level of the scan signal SC2, but is not limited to this. In other embodiments, the ending point of the conducting level of the scan signal SC2 can be used as the starting point of the clamping conducting time t1. Furthermore, if the detection result Dr2 has the high logic level and the display device 1 is currently scanning the third line scan, the scan control unit 22 adjusts the clamping signal CS3 corresponding to the current line scan according to the detection result Dr2. In this way, after the scan control unit 22 adjusts the clamping signal CS2, the voltage of the corresponding output terminal Q1 and the voltage of the second terminal of the scan switch 211 of the corresponding scan unit 21 become as follows: Figure 6 voltage SV Q1 The voltage Vsw2 is shown below. During a clamping period Ct in each scan cycle T of the corresponding scan unit 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 at the output terminal Q1 is... Q1 'Approximate voltage NV at output terminal Q1 when each LED113 is not short-circuited Q1 Furthermore, the voltage Vsw2' at the second terminal of the scanning switch 211 is affected by the voltage at the corresponding output terminal Q1, and approximates the voltage NV at the output terminal Q1 when each LED 113 is not short-circuited. Q1 In this way, the voltage Vsw2' at the second terminal of the scan switch 211 will not be clamped by the clamping voltage Vc and thus will not be able to clamp the voltage of the corresponding data line 112. As a result, the multiple LEDs 113 of the corresponding data line 112 will not be constantly lit or constantly dimmed due to the short circuit of the corresponding LED 113, thereby avoiding the short circuit caterpillar phenomenon.

[0123] <Second Embodiment>

[0124] See Figure 7 A second embodiment of the driving device of the present invention is a modification of the first embodiment, the difference being that a constant current device 315' and a first switch 316' are respectively replaced Figure 3 The constant current device 315 and the first switch 316.

[0125] The constant current device 315' receives the input voltage Vin and is electrically connected to the first input terminal of the comparator 318 of the detection circuit 312, generating the drive current Id based on the input voltage Vin. The first switch 316' has a first terminal electrically connected to the output terminal Q1 of the current drive circuit 311, and a second terminal electrically connected to the first input terminal of the comparator 318 and the constant current device 315', receiving the drive current Id. The first switch 316' is controlled by the pulse width control signal Pcj to be turned on or off. When the first switch 316' is turned on, it outputs the drive current Id to the corresponding data line 112, and the detection circuit 312 detects the voltage of the output terminal Q1 of the current drive circuit 311 via the first switch 316' to determine whether the corresponding data line 112 is abnormal.

[0126] It should be noted that the second embodiment has a similar operation to that described in the first embodiment above, and can achieve all the effects described in the first embodiment above. For the sake of brevity, it will not be described again here.

[0127] It should be noted that, such as Figure 1 As shown, the scan control unit 22 determines whether to adjust the clamping signal corresponding to the current line scan among the clamping signals CS1 to CSj based on the detection results Dr1 to Drj from the pulse width control unit 32, but is not limited thereto. The scan control unit 22 may also determine whether to adjust the clamping signal corresponding to the current line scan among the clamping signals CS1 to CSj based on the detection results from the drive unit 31, or the detection results from the last data device 3 among the plurality of data devices 3, or the detection results from each data device 3, or the detection results received via at least one data device 3 and a control device.

[0128] For details, please refer to Figures 8 to 17 This describes various implementations of the detection results being transmitted to the corresponding scanning control unit 22 via different transmission paths.

[0129] See Figure 8 , Figure 8 and Figure 1The difference lies in that the pulse width control unit 32 is not electrically connected to the scan control unit 22. Instead, the detection circuit 312 (not shown) of the drive unit 31 is electrically connected to the scan control unit 22. In this way, the detection circuit 312 of the drive unit 31 can directly transmit the detection results Dr1 to Drj to the scan control unit 22 to determine whether to adjust the clamping signal corresponding to the current row scan in the clamping signals CS1 to CSj. In other words, the detection circuit 312 does not need to first transmit the detection results Dr1 to Drj to the pulse width control unit 32, and then have the pulse width control unit 32 transmit them to the scan control unit 22.

[0130] See Figure 9 , Figure 9 and Figure 1 Similar, the difference between the two lies in Figure 9 In this scanning display, there are two display devices 1 and two data devices 3. The display devices 1 are electrically connected in a matrix arrangement. The pulse width control units 32 of the data devices 3 are connected in series, with each data device 3 electrically connected to its corresponding display device 1, and the pulse width control unit 32 of the last data device 3 electrically connected to the scanning control unit 22. The pulse width control unit 32 of the last data device 3 receives the detection results Dr1 to Drj generated by the pulse width control unit 32 of the first data device 3 (that is, the last data device 3 receives the detection results generated by each of the other data devices 3), and transmits the received detection results Dr1 to Drj and its own generated detection results Dr1' to Drj' to the scanning control unit 22.

[0131] See Figure 10 , Figure 10 and Figure 9 Similar, the difference between the two lies in Figure 10 In this scanning display, there are four display devices 1 and two scanning devices 2. Each scanning device 2 is electrically connected to its corresponding display device 1. The pulse width control unit 32 of the last data device 3 is electrically connected to the scanning control unit 22 of the scanning device 2. The pulse width control unit 32 of the last data device 3 transmits the received detection results Dr1 to Drj and its own generated detection results Dr1' to Drj' to the scanning control unit 22 of the scanning device 2.

[0132] See Figure 11 , Figure 11 and Figure 10 Similar, the difference between the two lies in Figure 11In this configuration, the scanning control units 22 of the scanning devices 2 are connected in series. The pulse width control unit 32 of the last data device 3 is electrically connected to the scanning control unit 22 of the first scanning device 2. The pulse width control unit 32 of the last data device 3 transmits the received detection results Dr1~Drj and its own generated detection results Dr1'~Drj' to the scanning control unit 22 of the first scanning device 2. The scanning control unit 22 of the i-th scanning device 2 transmits the received detection results Dr1~Drj, Dr1'~Drj' to the scanning control unit 22 of the (i+1)-th scanning device 2, where i is a positive integer, 1≦i≦N-1, and N is a total number of scanning devices 2. For example, in Figure 11 In the first scanning device 2, the scanning control unit 22 transmits the received detection results Dr1~Drj and Dr1'~Drj' to the scanning control unit 22 of the second scanning device 2.

[0133] See Figure 12 , Figure 12 and Figure 11 Similar, the difference between the two lies in Figure 12 In this configuration, the pulse width control units 32 of the data device 3 are not connected in series sequentially. Each pulse width control unit 32 of the data device 3 is electrically connected to the scan control unit 22 of the first scan device 2. The pulse width control unit 32 of the data device 3 transmits the generated detection results Dr1~Drj, Dr1'~Drj' to the scan control unit 22 of the first scan device 2.

[0134] See Figure 13 , Figure 13 and Figure 9 Similar, the difference between the two lies in Figure 13 In this configuration, the pulse width control units 32 of the data device 3 are not connected in series sequentially. Each pulse width control unit 32 of the data device 3 is electrically connected to the scan control unit 22 of the scan device 2 and the corresponding display device 1. The pulse width control unit 32 of the data device 3 transmits the detection results Dr1~Drj and Dr1'~Drj' generated respectively to the scan control unit 22.

[0135] See Figure 14 , Figure 14 and Figure 13 Similar, the difference between the two lies in Figure 14In this scanning display, there are four display devices 1 and two scanning devices 2. Each scanning device 2 is electrically connected to its corresponding display device 1. The pulse width control unit 32 of each data device 3 is electrically connected to the scanning control unit 22 of the scanning device 2 and the corresponding display device 1. The pulse width control unit 32 of the data device 3 transmits the generated detection results Dr1~Drj, Dr1'~Drj' to the scanning control unit 22.

[0136] See Figure 15 , Figure 16 and Figure 17 , Figures 15-17 respectively with Figures 9-11 Similar, the difference lies in Figure 15 , Figure 16 and Figure 17 The scanning display also includes a control device 4.

[0137] At Figure 15 In this configuration, the control device 4 is electrically connected between the pulse width control unit 32 of the last data device 3 and the scan control unit 22 of the scan device 2. The pulse width control unit 32 of the last data device 3 transmits the received detection results Dr1~Drj and its own generated detection results Dr1'~Drj' to the scan control unit 22 via the control device 4.

[0138] At Figure 16 In this configuration, the control device 4 is electrically connected to the pulse width control unit 32 of the last data device 3 and the scan control unit 22 of the scan device 2. The pulse width control unit 32 of the last data device 3 transmits the detection results Dr1~Drj, Dr1'~Drj' to the scan control unit 22 via the control device 4.

[0139] At Figure 17 In this configuration, the control device 4 is electrically connected between the pulse width control unit 32 of the last data device 3 and the scan control unit 22 of the first scan device 2. The pulse width control unit 32 of the last data device 3 transmits the detection results Dr1~Drj, Dr1'~Drj' to the scan control unit 22 of the first scan device 2 via the control device 4.

[0140] It should be noted that 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.

[0141] In summary, the scanning display with short-circuit detection function of the present invention uses each detection circuit 312 to detect the output terminal Q1 of each current drive circuit 311, and transmits the detection result Drj to the corresponding scanning control unit 22. The corresponding scanning control unit 22 can know whether the corresponding data line 112 is abnormal due to a short circuit of LED 113, and adjust the clamping signal CSj corresponding to the current row scan accordingly. In this way, the voltage Vsw2' of the second terminal of the corresponding scanning switch 211 will not be clamped by the clamping voltage Vc and thus cannot clamp the voltage of the corresponding data line 112. As a result, the multiple LEDs 113 of the corresponding data line 112 will not be constantly lit or constantly dim due to a short circuit of the corresponding LED 113, thereby avoiding the short-circuit caterpillar phenomenon. In addition, the data device 3 transmits the detection results Dr1 to Drj to each scanning device 2 or the control device 4 to notify each scanning device 2 or the control device 4 so that it knows whether there is an abnormality in the data line 112, thus the data device 3 has the function of notification.

[0142] 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, Include: The display device includes a common-cathode light-emitting diode array, the light-emitting diode array comprising, Multiple scan lines are set along the same line direction. Multiple data lines are arranged perpendicularly to each other along a column direction on the scan line, and Multiple 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. and The data device includes multiple drive units, each drive unit including, The current driving circuit has an output terminal electrically connected to a corresponding data line among the data lines, and is controlled by a pulse width control signal to generate and output at that output terminal either a driving current or a first clamping voltage to the corresponding data line. The detection circuit receives a detection timing signal, is electrically connected to the output terminal of the current drive circuit to detect the voltage at the output terminal, and generates a detection result indicating whether the corresponding data line is abnormal based on the voltage at the output terminal and the detection timing signal. The current driving circuit includes, The voltage regulator generates this first clamping voltage. An inverter receives the pulse width control signal and generates an inverted signal based on the pulse width control signal. A constant current circuit is used to receive an input voltage and generate a drive current based on that input voltage. A first switch has a first terminal electrically connected to the output terminal of the current drive circuit, and a second terminal electrically connected to the constant current device to receive the drive current. The first switch is controlled by the pulse width control signal to either turn on or off, and when on, outputs the drive current to the corresponding data line. The second switch has a first terminal electrically connected to the voltage regulator to receive the first clamping voltage, and a second terminal electrically connected to the output terminal of the current drive circuit. The second switch is controlled by the inverting signal to either turn on or off, and when on, outputs the first clamping voltage to the corresponding data line. The current drive circuit includes, The voltage regulator generates this first clamping voltage. An inverter receives the pulse width control signal and generates an inverted signal based on the pulse width control signal. A constant current circuit is used to receive an input voltage and is electrically connected to the detection circuit, and generates the drive current based on the input voltage. A first switch has a first terminal electrically connected to the output terminal of the current drive circuit, and a second terminal electrically connected to the detection circuit and the constant current device, receiving the drive current. The first switch is controlled by the pulse width control signal to either turn on or off. When the first switch is on, it outputs the drive current to the corresponding data line, and the detection circuit detects the voltage at the output terminal of the current drive circuit via the first switch. The second switch has a first terminal electrically connected to the voltage regulator to receive the first clamping voltage, and a second terminal electrically connected to the output terminal of the current drive circuit. The second switch is controlled by the inverting signal to be turned on or off, and when turned on, it outputs the first clamping voltage to the corresponding data line.

2. The scanning display with short-circuit detection function according to claim 1, characterized in that: In each drive unit, the detection circuit includes, The comparator has a first input terminal for detecting the voltage at the output terminal of the current drive circuit, a second input terminal for receiving a predetermined reference voltage, and an output terminal for providing a comparison result between the output voltage and the predetermined reference voltage. A logic gate has a first input terminal electrically connected to the comparator to receive the comparison result, a second input terminal to receive the detection timing signal, and an output terminal. The logic gate generates the detection result at the output terminal of the logic gate based on the comparison result and the detection timing signal.

3. The scanning display with short-circuit detection function according to claim 1, characterized in that: It also includes a scanning device, which includes The scanning control unit generates multiple scanning signals and multiple clamping signals, receives the detection results, and determines whether to adjust the clamping signal corresponding to the current row scan based on the detection results. Multiple scanning units, each receiving a reference voltage, are electrically connected to the scan lines and to the scan control unit to receive a corresponding scan signal from the scan signals and a corresponding clamping signal from the clamping signals. Each scanning unit determines whether to output the reference voltage based on the corresponding scan signal in the scan signals and whether to output a second clamping voltage based on the corresponding clamping signal in the clamping signals. Each scanning unit outputs one of the reference voltage and the second clamping voltage to a corresponding scan line in the scan lines.

4. The scanning display with short-circuit detection function according to claim 3, characterized in that: Each scanning unit includes, A scan switch has a first terminal for receiving the reference voltage and a second terminal electrically connected to the corresponding scan line in the scan lines. The scan switch is controlled to be turned on or off by the corresponding scan signal in the scan signal, and when turned on, the reference voltage is output to the corresponding scan line via the second terminal of the scan switch. The voltage regulator generates the second clamping voltage, and A clamping switch has a first terminal electrically connected to the voltage regulator to receive the second clamping voltage, and a second terminal electrically connected to the second terminal of the scan switch. The clamping switch is controlled by the corresponding clamping signal in the clamping signal to be turned on or off, and when turned on, outputs the second clamping voltage to the corresponding scan line through the second terminal of the scan switch. The on-time of the clamping switch is different from the on-time of the scan switch.

5. The scanning display with short-circuit detection function according to claim 3, characterized in that: The data device also includes, The pulse width control unit is electrically connected to the scan control unit, the current drive circuit and the detection circuit of each drive unit, generates and outputs the pulse width control signal required by each current drive circuit and the detection timing signal required by each detection circuit, and receives the detection result from the detection circuit and outputs it to the scan control unit.

6. The scanning display with short-circuit detection function according to claim 3, characterized in that: The data device also includes a pulse width control unit electrically connected to the current drive circuit and the detection circuit of each drive unit, generating and outputting the pulse width control signal required by each current drive circuit and the detection timing signal required by each detection circuit. The scanning control unit is electrically connected to the detection circuit of the drive unit to receive the detection results.

7. The scanning display with short-circuit detection function according to claim 3, characterized in that: A scan cycle for each scanning unit includes a scan interval and a clamping interval. Within that scan cycle of each scanning unit, The scanning signal and the clamping signal are complementary. During the scanning interval, the scanning signal has a conducting level; during the clamping interval, the scanning signal has a non-conducting level. The detection timing signal has multiple detection levels, each corresponding to a scanning interval of the scanning unit. The duration of each detection level varies with a predetermined reference voltage, and the duration of each detection level is the same and shorter than that of each scanning interval.

8. The scanning display with short-circuit detection function according to claim 7, characterized in that: In two adjacent scanning units, the end point of the conduction level of the scanning signal in the previous scanning unit corresponds to the start point of the conduction level of the scanning signal in the next scanning unit.

9. The scanning display with short-circuit detection function according to claim 7, characterized in that: When one of the detection results indicates an abnormality in the corresponding data line, the scan control unit adjusts the clamping signal corresponding to the current line scan in the clamping signal according to the detection result, so that in the scan interval of the current line scan, the clamping signal corresponding to the current line scan is maintained at the non-conducting level, and in the clamping interval, the clamping signal corresponding to the current line scan has the conducting level for a clamping conduction time, which is located in an initial period of the corresponding clamping interval.

10. The scanning display with short-circuit detection function according to claim 3, characterized in that, Also includes: Multiple display devices, electrically connected in a matrix arrangement; and Multiple data devices are connected in series, each data device is electrically connected to its corresponding display device, and the last data device is also electrically connected to the scanning control unit of the scanning device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own detection results to the scanning control unit.

11. The scanning display with short-circuit detection function according to claim 10, characterized in that, Also includes: Multiple scanning devices, each of which is electrically connected to the corresponding display device; The last data device is electrically connected to the scanning control unit of the scanning device, and the last data device transmits the received detection results and the detection results generated by itself to the scanning control unit of the scanning device.

12. The scanning display with short-circuit detection function according to claim 3, characterized in that, Also includes: Multiple such display devices are electrically connected in a matrix arrangement; and Multiple data devices are provided, each of which is electrically connected to the scanning control unit of the scanning device and the corresponding display device. Each data device transmits the generated detection results to the scanning control unit.

13. The scanning display with short-circuit detection function according to claim 12, characterized in that, Also includes: Multiple scanning devices, each of which is electrically connected to the corresponding display device; Each data device is electrically connected to the scanning control unit of the scanning device and the corresponding display device, and each data device transmits the generated detection results to the scanning control unit.

14. The scanning display with short-circuit detection function according to claim 3, characterized in that, Also includes: Multiple such display devices are electrically connected in a matrix arrangement; Multiple scanning devices are connected in series, and each scanning device is electrically connected to its corresponding display device. and Multiple data devices are connected in series. Each data device is electrically connected to its corresponding display device. The last data device is also electrically connected to the scanning control unit of the first scanning device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own generated detection results to the scanning control unit of the first scanning device. The scanning control unit of the i-th scanning device transmits the received detection results to the scanning control unit of the (i+1)-th scanning device, where i is a positive integer, 1 ≤ i ≤ N-1, and N is the total number of scanning devices.

15. The scanning display with short-circuit detection function according to claim 3, characterized in that, Also includes: Multiple such display devices are electrically connected in a matrix arrangement; Multiple scanning devices are connected in series, and each scanning device is electrically connected to its corresponding display device. and Multiple data devices are provided, each of which is electrically connected to the corresponding display device and the scanning control unit of the first scanning device of the scanning device. Each data device transmits the generated detection result to the scanning control unit of the first scanning device. The scanning control unit of the i-th scanning device transmits the received detection result to the scanning control unit of the (i+1)-th scanning device, where i is a positive integer, 1 ≦ i ≦ N-1, and N is a total number of scanning devices.

16. The scanning display with short-circuit detection function according to claim 3, characterized in that, Also includes: Multiple such display devices are electrically connected in a matrix arrangement; The control device, electrically connected to the scanning control unit of the scanning device; and Multiple data devices are connected in series, each data device is electrically connected to its corresponding display device, and the last data device is also electrically connected to the control device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own detection results to the scanning control unit via the control device.

17. The scanning display with short-circuit detection function according to claim 16, characterized in that, Also includes: Multiple scanning devices, each of which is electrically connected to the corresponding display device; The control device is electrically connected to the scanning control unit of each scanning device in the scanning device, and The last data device transmits the received detection results and its own generated detection results to the scanning control unit of the scanning device via the control device.

18. The scanning display with short-circuit detection function according to claim 3, characterized in that, Also includes: Multiple such display devices are electrically connected in a matrix arrangement; Multiple scanning devices are connected in series, and each scanning device is electrically connected to its corresponding display device. Control device, a scanning control unit of the first scanning device electrically connected to the scanning device; and Multiple data devices are connected in series. Each data device is electrically connected to its corresponding display device. The last data device is also electrically connected to the control device. The last data device receives the detection results generated by each of the other data devices and transmits the received detection results and its own detection results to the scanning control unit of the first scanning device via the control device. The scanning control unit of the i-th scanning device transmits the received detection results to the scanning control unit of the (i+1)-th scanning device, where i is a positive integer, 1 ≤ i ≤ N-1, and N is the total number of scanning devices.

19. A data device for a scanning display, the scanning display comprising a common-cathode array of light-emitting diodes and multiple data lines, characterized in that, The data device of the scanning display includes: Multiple drive units, each drive unit includes, A current-driven circuit has an output terminal electrically connected to a corresponding data line among the data lines, and is controlled by a pulse width control signal to generate either a drive current or a first clamping voltage at the output terminal and output it to the corresponding data line. The detection circuit receives a detection timing signal, is electrically connected to the output terminal of the current drive circuit to detect the voltage at the output terminal, and generates a detection result indicating whether the corresponding data line is abnormal based on the voltage at the output terminal and the detection timing signal. The current driving circuit includes, The voltage regulator generates this first clamping voltage. An inverter receives the pulse width control signal and generates an inverted signal based on the pulse width control signal. A constant current circuit is used to receive an input voltage and generate a drive current based on that input voltage. A first switch has a first terminal electrically connected to the output terminal of the current drive circuit, and a second terminal electrically connected to the constant current device to receive the drive current. The first switch is controlled by the pulse width control signal to either turn on or off, and when on, outputs the drive current to the corresponding data line. The second switch has a first terminal electrically connected to the voltage regulator to receive the first clamping voltage, and a second terminal electrically connected to the output terminal of the current drive circuit. The second switch is controlled by the inverting signal to be turned on or off, and when turned on, it outputs the first clamping voltage to the corresponding data line.

20. The data device for a scanning display according to claim 19, characterized in that: In each drive unit, the detection circuit includes, The comparator has a first input terminal for detecting the voltage at the output terminal of the current drive circuit, a second input terminal for receiving a predetermined reference voltage, and an output terminal for providing a comparison result between the output voltage and the predetermined reference voltage. A logic gate has a first input terminal electrically connected to the comparator to receive the comparison result, a second input terminal to receive the detection timing signal, and an output terminal. The logic gate generates the detection result at the output terminal of the logic gate based on the comparison result and the detection timing signal.

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