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TWI698846B - LED display drive circuit with LED open circuit detection function, LED open circuit detection method and LED display device - Google Patents

LED display drive circuit with LED open circuit detection function, LED open circuit detection method and LED display device Download PDF

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TWI698846B
TWI698846B TW108110172A TW108110172A TWI698846B TW I698846 B TWI698846 B TW I698846B TW 108110172 A TW108110172 A TW 108110172A TW 108110172 A TW108110172 A TW 108110172A TW I698846 B TWI698846 B TW I698846B
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drive circuit
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TW202036507A (en
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畢乾
勇 王
耿俊成
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大陸商北京集創北方科技股份有限公司
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Abstract

一種LED顯示驅動電路，用以驅動一LED陣列，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，且該顯示驅動電路的特徵在於：當該顯示驅動電路對一行所述LED單元進行一開路檢測操作時，該LED行驅動電路的一個對應的驅動輸出端會輸出一第一直流電壓至一條對應的所述行掃描信號線，且其他M-1個所述驅動輸出端會輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓。 An LED display drive circuit for driving an LED array, the LED array has M row scanning signal lines, N output channel signal lines and M*N LED units. The display drive circuit has an LED row drive circuit and an LED constant current drive circuit, and the display drive circuit is characterized in that: when the display drive circuit performs an open circuit detection operation on a row of the LED units, a corresponding drive output terminal of the LED row drive circuit will output a first DC voltage to one corresponding row scanning signal line, and the other M-1 drive output terminals will output a second DC voltage to the corresponding M-1 row scanning signal lines, wherein the first The DC voltage is greater than the forward bias voltage of any of the LED units, and the second DC voltage is less than the forward bias voltage.

Description

具LED開路檢測功能的LED顯示驅動電路、LED開路檢測方 法及LED顯示裝置 LED display drive circuit with LED open circuit detection function, LED open circuit detection method Method and LED display device

本發明係關於一種LED顯示驅動電路，特別是具LED開路檢測功能的LED顯示驅動器。 The present invention relates to an LED display driving circuit, in particular to an LED display driver with LED open circuit detection function.

為了確保LED顯示幕的品質，目前的LED顯示驅動電路除了提供正常的顯示驅動功能外，還須提供壞LED的檢測功能。在進行LED檢測功能時，一般的LED顯示驅動電路會利用一行驅動電路輪流對一LED陣列的各行輸出一直流電壓，並利用一恒流驅動電路的複數個通道連接端檢測各行LED是否有開路的狀況。 In order to ensure the quality of the LED display screen, the current LED display drive circuit must provide a bad LED detection function in addition to the normal display drive function. When performing the LED detection function, a general LED display drive circuit uses a row of drive circuits to output a DC voltage to each row of an LED array in turn, and uses a plurality of channel connections of a constant current drive circuit to detect whether each row of LEDs is open. situation.

請參照圖1，其繪示一習知LED顯示驅動電路執行一開路檢測操作的示意圖。如圖1所示，該習知LED顯示驅動電路具有一LED行驅動電路10及一LED恒流驅動電路20以驅動一LED陣列30，其中，LED陣列30具有3行，每行均具有4個LED單元31，第一行的第3個LED單元31短路，且第2行的第2個LED單元31開路。 Please refer to FIG. 1, which illustrates a schematic diagram of a conventional LED display driving circuit performing an open circuit detection operation. As shown in FIG. 1, the conventional LED display driving circuit has an LED row driving circuit 10 and an LED constant current driving circuit 20 to drive an LED array 30. The LED array 30 has 3 rows, and each row has 4 For the LED unit 31, the third LED unit 31 in the first row is short-circuited, and the second LED unit 31 in the second row is open.

在開路檢測的過程中，LED行驅動電路10會輪流對各行輸出一直流電壓Vdd，如果各行的4個LED單元31都正常，則LED恒流驅動電路20的4個通道連接端(OUT1,OUT2,OUT3,OUT4)都會檢測到Vdd-Vf的電壓，其中，Vf為LED的順偏電壓；如果有一個LED單元31開路，則LED恒流驅動電路20的一個對應通道連接端會偵測到一開路狀態。因此，當開路檢測操作進行到第2行時，在第2行的第2個LED單元31為開路的情況下，LED恒流驅動電路20的第二個通道連接端OUT2理應偵測到一開路狀態，然而，由於第一行的第3個LED單元31是短路的，因此，OUT2會偵測到(Vdd-Vf23-Vf12)的電壓而非開路狀態，其中，Vf23為第2行的第3個LED單元31的順偏電壓，Vf12為第1行的第2個LED單元31的順偏電壓。也就是說，該習知LED顯示驅動電路在進 行LED陣列開路檢測作業時，若存在短路的LED單元31，則該開路檢測作業會失效。 In the process of open circuit detection, the LED row driving circuit 10 will output the DC voltage V dd to each row in turn. If the 4 LED units 31 in each row are normal, the 4 channel connection ends (OUT1, OUT2, OUT3, OUT4) will detect the voltage of V dd -V f , where V f is the forward bias voltage of the LED; if one LED unit 31 is open, a corresponding channel connection end of the LED constant current drive circuit 20 will be An open circuit condition is detected. Therefore, when the open circuit detection operation proceeds to the second line, in the case that the second LED unit 31 in the second line is open, the second channel connection terminal OUT2 of the LED constant current drive circuit 20 should detect an open circuit However, since the third LED unit 31 in the first row is short-circuited, OUT2 will detect the voltage of (V dd -V f23 -V f12 ) instead of an open circuit state, where V f23 is the second The forward bias voltage of the third LED unit 31 of the row, and V f12 is the forward bias voltage of the second LED unit 31 of the first row. In other words, when the conventional LED display driving circuit is performing the LED array open circuit detection operation, if there is a short-circuited LED unit 31, the open circuit detection operation will fail.

為解決上述問題，本領域亟需一新穎的LED顯示驅動電路。 In order to solve the above problems, a novel LED display driving circuit is urgently needed in this field.

本發明之一目的在於提供一種LED顯示驅動電路，其可在不須增加連接線的情況下，有效檢測出一LED陣列中的開路LED。 An object of the present invention is to provide an LED display drive circuit, which can effectively detect open LEDs in an LED array without adding a connection line.

本發明之另一目的在於提供一種LED顯示驅動電路，其可利用行驅動電路與恒流驅動電路相互配合，以解決短路LED單元帶來的開路檢測失效問題。 Another object of the present invention is to provide an LED display drive circuit, which can utilize the row drive circuit and the constant current drive circuit to cooperate with each other to solve the open circuit detection failure problem caused by the short-circuited LED unit.

本發明之又一目的在於提供一種LED顯示驅動電路，其可利用既有的驅動電路提供正常顯示驅動模式或開路檢測模式。 Another object of the present invention is to provide an LED display drive circuit, which can use an existing drive circuit to provide a normal display drive mode or an open circuit detection mode.

為達上述目的，一種LED顯示驅動電路乃被提出，其係用以驅動一LED陣列，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，M、N均為大於1的整數，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，其中，該LED行驅動電路具有M個驅動輸出端以與M條所述行掃描信號線耦接，該LED恒流驅動電路具有N個通道連接端以與N條所述輸出通道信號線耦接，且該顯示驅動電路的特徵在於：當該顯示驅動電路對一行所述LED單元進行一開路檢測操作時，該LED行驅動電路的一個對應的所述驅動輸出端會輸出一第一直流電壓至一條對應的所述行掃描信號線，且其他M-1個所述驅動輸出端會輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓。 To achieve the above objective, an LED display drive circuit is proposed, which is used to drive an LED array, the LED array has M row scan signal lines, N output channel signal lines and M*N LED units, M, N is an integer greater than 1. The display drive circuit has an LED row drive circuit and an LED constant current drive circuit, wherein the LED row drive circuit has M drive output terminals to couple with the M row scan signal lines Then, the LED constant current drive circuit has N channel connection ends to be coupled to the N output channel signal lines, and the display drive circuit is characterized in that: when the display drive circuit performs an open circuit on a row of the LED units During the detection operation, a corresponding driving output terminal of the LED row driving circuit will output a first DC voltage to a corresponding row scanning signal line, and the other M-1 driving output terminals will output a The second DC voltage is applied to the corresponding M-1 row scan signal lines, wherein the first DC voltage is greater than the forward bias voltage of any one of the LED units, and the second DC voltage is less than the forward bias voltage .

在可能的實施例中，該LED陣列可為量子點發光二極體陣列、Mirco-LED陣列或Mini-LED陣列。 In a possible embodiment, the LED array may be a quantum dot light emitting diode array, a Mirco-LED array, or a Mini-LED array.

在一實施例中，該LED行驅動電路在各所述驅動輸出端內部均設置有一限流電路。 In an embodiment, the LED row driving circuit is provided with a current limiting circuit inside each of the driving output terminals.

另外，本發明亦提出一種LED開路檢測方法，其係利用一LED 顯示驅動電路驅動一LED陣列而實現，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，M、N均為大於1的整數，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，其中，該LED行驅動電路具有M個驅動輸出端以與M條所述行掃描信號線耦接，該LED恒流驅動電路具有N個通道連接端以與N條所述輸出通道信號線耦接，該方法包含：利用該LED行驅動電路的一個對應的所述驅動輸出端輸出一第一直流電壓至一條對應的所述行掃描信號線，且使其他M-1個所述驅動輸出端輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓；以及利用該LED恒流驅動電路的N個所述通道連接端檢測N條所述輸出通道信號線是否有一開路狀態。 In addition, the present invention also proposes an LED open circuit detection method, which uses an LED The display driving circuit is implemented by driving an LED array. The LED array has M row scanning signal lines, N output channel signal lines, and M*N LED units. M and N are both integers greater than 1, and the display driving circuit has An LED row drive circuit and an LED constant current drive circuit, wherein the LED row drive circuit has M drive output terminals to be coupled to the M row scan signal lines, and the LED constant current drive circuit has N channel connections The terminal is coupled to the N output channel signal lines, and the method includes: outputting a first DC voltage to a corresponding row scanning signal line by using a corresponding driving output terminal of the LED row driving circuit, And make the other M-1 drive output terminals output a second DC voltage to the corresponding M-1 row scan signal lines, wherein the first DC voltage is greater than the forward bias voltage of any one of the LED units , And the second DC voltage is less than the forward bias voltage; and using the N channel connection ends of the LED constant current drive circuit to detect whether the N output channel signal lines have an open circuit state.

在可能的實施例中，該LED陣列可為量子點發光二極體陣列、Mirco-LED陣列或Mini-LED陣列。 In a possible embodiment, the LED array may be a quantum dot light emitting diode array, a Mirco-LED array, or a Mini-LED array.

在一實施例中，該LED行驅動電路在各所述驅動輸出端內部均設置有一限流電路。 In an embodiment, the LED row driving circuit is provided with a current limiting circuit inside each of the driving output terminals.

另外，本發明亦提出一種LED顯示裝置，其具有如前述之LED顯示驅動電路及LED陣列。 In addition, the present invention also provides an LED display device having the aforementioned LED display driving circuit and LED array.

在可能的實施例中，所述之LED顯示裝置可為量子點發光二極體顯示裝置、Mirco-LED顯示裝置或Mini-LED顯示裝置。 In possible embodiments, the LED display device may be a quantum dot light-emitting diode display device, a Mirco-LED display device or a Mini-LED display device.

在一實施例中，該LED行驅動電路在各所述驅動輸出端內部均設置有一限流電路。 In an embodiment, the LED row driving circuit is provided with a current limiting circuit inside each of the driving output terminals.

為使 貴審查委員能進一步瞭解本發明之結構、特徵及其目的，茲附以圖式及較佳具體實施例之詳細說明如後。 In order to enable your reviewer to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are attached as follows.

10:LED行驅動電路 10: LED row drive circuit

20:LED恒流驅動電路 20: LED constant current drive circuit

30:LED陣列 30: LED array

31:LED單元 31: LED unit

100:LED行驅動電路 100: LED row drive circuit

200:LED恒流驅動電路 200: LED constant current drive circuit

300:LED陣列 300: LED array

301:LED單元 301: LED unit

400:LED顯示裝置 400: LED display device

410:LED顯示驅動電路 410: LED display drive circuit

420:LED陣列 420: LED array

步驟a:利用該LED行驅動電路的一個對應的所述驅動輸出端輸出一第一直流電壓至一條對應的所述行掃描信號線，且使其他M-1個所述驅動輸出端輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓 Step a: Use a corresponding drive output terminal of the LED row drive circuit to output a first DC voltage to a corresponding row scan signal line, and make the other M-1 drive output terminals output a first Two DC voltages to the corresponding M-1 row scan signal lines, wherein the first DC voltage is greater than the forward bias voltage of any one of the LED units, and the second DC voltage is less than the forward bias voltage

步驟b:利用該LED恒流驅動電路的N個所述通道連接端檢測N條所述輸出通道信號線是否有一開路狀態 Step b: Use the N channel connection ends of the LED constant current drive circuit to detect whether the N output channel signal lines have an open state

圖1繪示一習知LED顯示驅動電路執行一開路檢測操作的示意圖。 FIG. 1 shows a schematic diagram of a conventional LED display driving circuit performing an open circuit detection operation.

圖2繪示本發明之LED顯示驅動電路執行一開路檢測操作的示意圖。 FIG. 2 shows a schematic diagram of the LED display driving circuit of the present invention performing an open circuit detection operation.

圖3繪示發明之LED開路檢測方法之一實施例的流程圖。 Fig. 3 shows a flow chart of an embodiment of the LED open circuit detection method of the invention.

圖4繪示發明之LED顯示裝置之一實施例的方塊圖。 FIG. 4 is a block diagram of an embodiment of the LED display device of the invention.

請參照圖2，其繪示本發明之LED顯示驅動電路執行一開路檢測操作的示意圖。 Please refer to FIG. 2, which illustrates a schematic diagram of the LED display driving circuit of the present invention performing an open circuit detection operation.

如圖2所示，該LED顯示驅動電路具有一LED行驅動電路100及一LED恒流驅動電路200以驅動一LED陣列300，其中，LED陣列300具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元301，M、N均為大於1的整數，在此實施例中M=3，N=4；LED行驅動電路100具有M個驅動輸出端(在此實施例中為L1,L2,L3)以與M條所述行掃描信號線耦接，LED恒流驅動電路200具有N個通道連接端(在此實施例中為OUT1,OUT2,OUT3,OUT4)以與N條所述輸出通道信號線耦接。另外，假設LED陣列300的第一行的第3個LED單元301短路，及第2行的第2個LED單元301開路。 As shown in FIG. 2, the LED display driving circuit has an LED row driving circuit 100 and an LED constant current driving circuit 200 to drive an LED array 300, wherein the LED array 300 has M row scanning signal lines and N output channels The signal line and M*N LED units 301, M and N are integers greater than 1, in this embodiment M=3, N=4; the LED row drive circuit 100 has M drive output terminals (in this embodiment L1, L2, L3) in order to be coupled to the M row scanning signal lines, the LED constant current drive circuit 200 has N channel connection terminals (in this embodiment, OUT1, OUT2, OUT3, OUT4) to connect with The N output channel signal lines are coupled. In addition, it is assumed that the third LED unit 301 in the first row of the LED array 300 is short-circuited, and the second LED unit 301 in the second row is open.

該LED顯示驅動電路具有一顯示驅動模式及一開路檢測模式。當該LED顯示驅動電路工作在所述顯示驅動模式時，LED行驅動電路100係用以提供一直流電壓，且LED恒流驅動電路200係用以恆定一通道電流，從而產生一定電流以驅動LED陣列300的各LED單元301；當該LED顯示驅動電路工作在所述開路檢測模式時，該LED顯示驅動電路會一行一行地檢測LED陣列300，其中，當該顯示驅動電路對一行LED單元301進行一開路檢測操作時，LED行驅動電路100的一個對應的所述驅動輸出端會輸出一第一直流電壓Vdd至一條對應的所述行掃描信號線，且其他M-1個所述驅動輸出端會輸出一第二直流電壓Vdn至對應的M-1條所述行掃描信號線，其中，第一直流電壓Vdd大於任一LED單元301的順偏電壓Vf，且第二直流電壓Vdn小於所述的順偏電壓Vf。 The LED display drive circuit has a display drive mode and an open circuit detection mode. When the LED display driving circuit works in the display driving mode, the LED row driving circuit 100 is used to provide a DC voltage, and the LED constant current driving circuit 200 is used to constant a channel current to generate a certain current to drive the LED Each LED unit 301 of the array 300; when the LED display drive circuit works in the open circuit detection mode, the LED display drive circuit will detect the LED array 300 line by line, wherein, when the display drive circuit performs a row of the LED unit 301 During an open-circuit detection operation, a corresponding drive output terminal of the LED row drive circuit 100 outputs a first DC voltage V dd to a corresponding row scan signal line, and the other M-1 drive outputs The terminal will output a second DC voltage V dn to the corresponding M-1 row scanning signal lines, where the first DC voltage V dd is greater than the forward bias voltage V f of any LED unit 301, and the second DC voltage V dn is less than the forward bias voltage V f .

在此實施例中，如果各行的4個LED單元301都正常，則LED恒流驅動電路200的4個通道連接端(OUT1,OUT2,OUT3,OUT4)都會檢測到 Vdd-Vf的電壓；如果有一個LED單元301開路，則LED恒流驅動電路200的一個對應通道連接端會偵測到一開路狀態。 In this embodiment, if the 4 LED units 301 in each row are normal, the 4 channel connection ends (OUT1, OUT2, OUT3, OUT4) of the LED constant current driving circuit 200 will all detect the voltage of V dd -V f ; If an LED unit 301 is open, a corresponding channel connection end of the LED constant current driving circuit 200 will detect an open state.

特別地，在第一行的第3個LED單元301短路，且第2行的第2個LED單元301開路的情況下，當所述開路檢測操作進行到第2行時，驅動輸出端L2會輸出第一直流電壓Vdd，驅動輸出端L1、L3會輸出Vdn；雖然OUT3會因為第一行的第3個LED單元301的短路而連接到L1，然而由於L1的電壓被設定為第二直流電壓Vdn，而Vdn<Vf，因此，第一行的第2個LED單元301將不會導通，而使OUT2仍然可偵測到開路狀態。也就是說，藉由以第二直流電壓Vdn驅動未被掃描的行，本發明的LED顯示驅動電路在進行LED陣列開路檢測作業時，即使存在短路的LED單元301，該開路檢測作業也不會失效。另外，為避免產生大電流，LED行驅動電路100可在各所述驅動輸出端內部設置一限流電路。 In particular, when the third LED unit 301 in the first row is short-circuited and the second LED unit 301 in the second row is open, when the open-circuit detection operation proceeds to the second row, the drive output terminal L2 will Output the first DC voltage V dd , the drive output terminals L1 and L3 will output V dn ; Although OUT3 will be connected to L1 due to the short circuit of the third LED unit 301 in the first row, the voltage of L1 is set to the second The DC voltage is V dn , and V dn <V f , therefore, the second LED unit 301 in the first row will not be turned on, and OUT2 can still detect an open circuit state. In other words, by driving the unscanned rows with the second DC voltage V dn , when the LED display driving circuit of the present invention performs the LED array open circuit detection operation, even if there is a short-circuited LED unit 301, the open circuit detection operation is not Will fail. In addition, in order to avoid a large current, the LED row driving circuit 100 may be provided with a current limiting circuit inside each of the driving output terminals.

依上述的說明，本發明進一步提出一種LED開路檢測方法。請參照圖3，其繪示發明之LED開路檢測方法之一實施例的流程圖，其中，該方法係利用一LED顯示驅動電路驅動一LED陣列而實現，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，M、N均為大於1的整數，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，其中，該LED行驅動電路具有M個驅動輸出端以與M條所述行掃描信號線耦接，該LED恒流驅動電路具有N個通道連接端以與N條所述輸出通道信號線耦接。如圖3所示，該方法包含：利用該LED行驅動電路的一個對應的所述驅動輸出端輸出一第一直流電壓至一條對應的所述行掃描信號線，且使其他M-1個所述驅動輸出端輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓(步驟a)；以及利用該LED恒流驅動電路的N個所述通道連接端檢測N條所述輸出通道信號線是否有一開路狀態(步驟b)。另外，為避免產生大電流，該LED行驅動電路可在各所述驅動輸出端內部設置一限流電路。 Based on the above description, the present invention further proposes an open-circuit detection method for LEDs. Please refer to FIG. 3, which shows a flowchart of an embodiment of the inventive LED open circuit detection method, wherein the method is implemented by driving an LED array with an LED display driving circuit, and the LED array has M rows of scanning signal lines , N output channel signal lines and M*N LED units, M and N are integers greater than 1. The display drive circuit has an LED row drive circuit and an LED constant current drive circuit, wherein the LED row drive circuit The LED constant current drive circuit has M drive output terminals for coupling with the M row scanning signal lines, and the LED constant current drive circuit has N channel connection terminals for coupling with the N output channel signal lines. As shown in FIG. 3, the method includes: using a corresponding driving output terminal of the LED row driving circuit to output a first DC voltage to a corresponding row scanning signal line, and enabling other M-1 The driving output terminal outputs a second DC voltage to the corresponding M-1 row scanning signal lines, wherein the first DC voltage is greater than the forward bias voltage of any one of the LED units, and the second DC voltage is less than The forward bias voltage (step a); and using the N channel connection ends of the LED constant current drive circuit to detect whether the N output channel signal lines have an open circuit state (step b). In addition, in order to avoid a large current, the LED row driving circuit can be provided with a current limiting circuit inside each of the driving output terminals.

依上述的說明，本發明進一步提出一種LED顯示裝置。請參照圖4，其繪示發明之LED顯示裝置之一實施例的方塊圖。如圖4所示，一LED顯示裝置400具有一LED顯示驅動電路410(如前述之LED顯示驅動電路)及一LED陣列420(如前述之LED陣列300)，以提供所述的顯示驅動模式及開路檢測模式。 Based on the above description, the present invention further provides an LED display device. Please refer to FIG. 4, which shows a block diagram of an embodiment of the LED display device of the invention. As shown in FIG. 4, an LED display device 400 has an LED display driving circuit 410 (such as the aforementioned LED display driving circuit) and an LED array 420 (such as the aforementioned LED array 300) to provide the aforementioned display driving mode and Open circuit detection mode.

另外，在可能的實施例中，LED顯示裝置400可為量子點發光二極體顯示裝置、Mirco-LED顯示裝置或Mini-LED顯示裝置。 In addition, in possible embodiments, the LED display device 400 may be a quantum dot light-emitting diode display device, a Mirco-LED display device, or a Mini-LED display device.

藉由前述所揭露的設計，本發明乃具有以下的優點： With the design disclosed above, the present invention has the following advantages:

1.本發明的LED顯示驅動電路可在不須增加連接線的情況下，有效檢測出一LED陣列中的開路LED。 1. The LED display drive circuit of the present invention can effectively detect open LEDs in an LED array without adding a connection line.

2.本發明的LED顯示驅動電路可利用行驅動電路與恒流驅動電路相互配合，以解決短路LED單元帶來的開路檢測失效問題。 2. The LED display driving circuit of the present invention can use the row driving circuit and the constant current driving circuit to cooperate with each other to solve the open circuit detection failure problem caused by the short-circuited LED unit.

3.本發明的LED顯示驅動電路可利用既有的驅動電路提供正常顯示驅動模式或開路檢測模式。 3. The LED display drive circuit of the present invention can utilize an existing drive circuit to provide a normal display drive mode or an open circuit detection mode.

本案所揭示者，乃較佳實施例，舉凡局部之變更或修飾而源於本案之技術思想而為熟習該項技藝之人所易於推知者，俱不脫本案之專利權範疇。 The disclosure in this case is a preferred embodiment, and any partial changes or modifications that are derived from the technical ideas of the case and can be easily inferred by those familiar with the art will not deviate from the scope of the patent right of the case.

綜上所陳，本案無論目的、手段或功效，皆顯示其迥異於習知技術，且其首先發明合於實用，確實符合發明之專利要件，懇請 貴審查委員明察，並早日賜予專利俾嘉惠社會，是為至禱。 To sum up, regardless of the purpose, means or effect of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. I sincerely ask your examiner to check it out and grant the patent as soon as possible. Society is for the best prayer.

100:LED行驅動電路 100: LED row drive circuit

200:LED恒流驅動電路 200: LED constant current drive circuit

300:LED陣列 300: LED array

301:LED單元 301: LED unit

Claims (9)

一種LED顯示驅動電路，用以驅動一LED陣列，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，M、N均為大於1的整數，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，其中，該LED行驅動電路具有M個驅動輸出端以與M條所述行掃描信號線耦接，該LED恒流驅動電路具有N個通道連接端以與N條所述輸出通道信號線耦接，且該顯示驅動電路的特徵在於：   當該顯示驅動電路對一行所述LED單元進行一開路檢測操作時，該LED行驅動電路的一個對應的所述驅動輸出端會輸出一第一直流電壓至一條對應的所述行掃描信號線，且其他M-1個所述驅動輸出端會輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓。An LED display drive circuit for driving an LED array. The LED array has M row scanning signal lines, N output channel signal lines, and M*N LED units. M and N are integers greater than 1. The display The drive circuit has an LED row drive circuit and an LED constant current drive circuit, wherein the LED row drive circuit has M drive output terminals to be coupled to the M row scan signal lines, and the LED constant current drive circuit has N The channel connection ends are coupled to the N output channel signal lines, and the display drive circuit is characterized by: When the display drive circuit performs an open circuit detection operation on a row of the LED units, the LED row drive circuit One corresponding drive output terminal will output a first DC voltage to one corresponding row scanning signal line, and the other M-1 drive output terminals will output a second DC voltage to the corresponding M-1 Each of the row scan signal lines, wherein the first direct current voltage is greater than the forward bias voltage of any one of the LED units, and the second direct current voltage is less than the forward bias voltage. 如請求項1所述之LED顯示驅動電路，其中該LED陣列係由量子點發光二極體陣列、Mirco-LED陣列和Mini-LED陣列所組成的群組所選擇的一種顯示陣列。The LED display driving circuit according to claim 1, wherein the LED array is a display array selected by the group consisting of a quantum dot light-emitting diode array, a Mirco-LED array, and a Mini-LED array. 如請求項1所述之LED顯示驅動電路，其中該LED行驅動電路在各所述驅動輸出端內部均設置有一限流電路。The LED display driving circuit according to claim 1, wherein the LED row driving circuit is provided with a current limiting circuit inside each of the driving output terminals. 一種LED開路檢測方法，係利用一LED顯示驅動電路驅動一LED陣列而實現，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，M、N均為大於1的整數，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，其中，該LED行驅動電路具有M個驅動輸出端以與M條所述行掃描信號線耦接，該LED恒流驅動電路具有N個通道連接端以與N條所述輸出通道信號線耦接，該方法包含：   利用該LED行驅動電路的一個對應的所述驅動輸出端輸出一第一直流電壓至一條對應的所述行掃描信號線，且使其他M-1個所述驅動輸出端輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓；以及   利用該LED恒流驅動電路的N個所述通道連接端檢測N條所述輸出通道信號線是否有一開路狀態。An LED open circuit detection method is realized by using an LED display drive circuit to drive an LED array. The LED array has M row scanning signal lines, N output channel signal lines and M*N LED units, both M and N An integer greater than 1, the display drive circuit has an LED row drive circuit and an LED constant current drive circuit, wherein the LED row drive circuit has M drive output terminals to be coupled to the M row scan signal lines, the The LED constant current driving circuit has N channel connection terminals to be coupled to the N output channel signal lines. The method includes: Utilizing a corresponding driving output terminal of the LED row driving circuit to output a first DC voltage to One corresponding row scanning signal line, and enabling other M-1 drive output terminals to output a second DC voltage to the corresponding M-1 row scanning signal lines, wherein the first DC voltage is greater than The forward bias voltage of any one of the LED units, and the second DC voltage is less than the forward bias voltage; and use the N channel connection ends of the LED constant current drive circuit to detect the N output channel signal lines Is there an open circuit state? 如請求項4所述之LED開路檢測方法，其中該LED陣列係由量子點發光二極體陣列、Mirco-LED陣列和Mini-LED陣列所組成的群組所選擇的一種顯示陣列。The LED open circuit detection method according to claim 4, wherein the LED array is a display array selected by the group consisting of a quantum dot light-emitting diode array, a Mirco-LED array, and a Mini-LED array. 如請求項4所述之LED開路檢測方法，其中該LED行驅動電路在各所述驅動輸出端內部均設置有一限流電路。The LED open circuit detection method according to claim 4, wherein the LED row driving circuit is provided with a current limiting circuit inside each of the driving output terminals. 一種LED顯示裝置，其具有一LED陣列及用以驅動該LED陣列之一LED顯示驅動電路，該LED陣列具有M條行掃描信號線、N條輸出通道信號線及M*N個LED單元，M、N均為大於1的整數，該顯示驅動電路具有一LED行驅動電路及一LED恒流驅動電路，其中，該LED行驅動電路具有M個驅動輸出端以與M條所述行掃描信號線耦接，該LED恒流驅動電路具有N個通道連接端以與N條所述輸出通道信號線耦接，且該顯示驅動電路的特徵在於：         當該顯示驅動電路對一行所述LED單元進行一開路檢測操作時，該LED行驅動電路的一個對應的所述驅動輸出端會輸出一第一直流電壓至一條對應的所述行掃描信號線，且其他M-1個所述驅動輸出端會輸出一第二直流電壓至對應的M-1條所述行掃描信號線，其中，該第一直流電壓大於任一所述LED單元的順偏電壓，且該第二直流電壓小於所述的順偏電壓。An LED display device has an LED array and an LED display drive circuit for driving the LED array. The LED array has M row scanning signal lines, N output channel signal lines, and M*N LED units. , N are integers greater than 1. The display drive circuit has an LED row drive circuit and an LED constant current drive circuit, wherein the LED row drive circuit has M drive output terminals to communicate with the M row scan signal lines The LED constant current drive circuit has N channel connection ends to be coupled to the N output channel signal lines, and the display drive circuit is characterized by: When the display drive circuit performs a test on a row of the LED units During the open circuit detection operation, a corresponding drive output terminal of the LED row drive circuit will output a first DC voltage to a corresponding row scan signal line, and the other M-1 drive output terminals will output A second DC voltage is applied to the corresponding M-1 row scan signal lines, wherein the first DC voltage is greater than the forward bias voltage of any one of the LED units, and the second DC voltage is less than the forward bias Voltage. 如請求項7所述之LED顯示裝置，其係由量子點發光二極體顯示裝置、Mirco-LED顯示裝置和Mini-LED顯示裝置所組成的群組所選擇的一種顯示裝置。The LED display device according to claim 7, which is a display device selected by the group consisting of a quantum dot light-emitting diode display device, a Mirco-LED display device, and a Mini-LED display device. 如請求項7所述之LED顯示裝置，其中該LED行驅動電路在各所述驅動輸出端內部均設置有一限流電路。The LED display device according to claim 7, wherein the LED row driving circuit is provided with a current limiting circuit inside each of the driving output terminals.
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