CN116030742A - Light-emitting diode display panel detection device and detection method - Google Patents
Light-emitting diode display panel detection device and detection method Download PDFInfo
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- CN116030742A CN116030742A CN202310252974.8A CN202310252974A CN116030742A CN 116030742 A CN116030742 A CN 116030742A CN 202310252974 A CN202310252974 A CN 202310252974A CN 116030742 A CN116030742 A CN 116030742A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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Abstract
The invention discloses a detection device and a detection method for a light-emitting diode display panel. The light-emitting diode display panel detection device comprises m first connecting lines, n second connecting lines and a detection circuit. m and n are positive integers. The light emitting diode display panel comprises m×n light emitting diodes. Each first connecting wire is respectively coupled with the anodes of the n light emitting diodes. Each second connecting wire is respectively coupled with the cathodes of the m light emitting diodes. In the method for detecting the light emitting diode display panel, the detection circuit can selectively execute at least one of the first detection mode to the third detection mode on m×n light emitting diodes so as to detect abnormal light emitting diodes.
Description
Technical Field
The present invention relates to a display panel, and more particularly, to a light emitting diode display panel detection device and a light emitting diode display panel detection method.
Background
Generally, most of the current methods for detecting abnormal leds of led display panels generally perform optical detection by ultraviolet irradiation after completing mass transfer, or perform detection by image recognition after connecting the system.
However, since the conventional inspection method only inspects a single led in each inspection, it takes a very long time to complete the inspection of all leds, which results in poor inspection efficiency of the led display panel.
Disclosure of Invention
In view of the above, the present invention provides a light emitting diode display panel detection device and a light emitting diode display panel detection method, so as to effectively solve the above-mentioned problems encountered in the prior art.
An embodiment of the invention is a light emitting diode display panel detection device. In this embodiment, the light emitting diode display panel detection device is used for detecting the light emitting diode display panel. The light emitting diode display panel comprises m x n light emitting diodes, wherein m and n are positive integers.
The light-emitting diode display panel detection device comprises m first connecting lines, n second connecting lines and a detection circuit. m and n are positive integers. Each first connecting wire is coupled with the anodes of the n light emitting diodes respectively. Each second connecting wire is respectively coupled with the cathodes of the m light emitting diodes. The detection circuit is used for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m x n light emitting diodes so as to detect abnormal light emitting diodes.
In the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines; when any one of the m first connecting lines is activated, the detection circuit sequentially detects the n second connecting lines. In the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously. In the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines simultaneously.
In an embodiment, the detection circuit performs the second detection mode or the third detection mode to detect the abnormality, and then determines that the number of the detected abnormal leds is greater than 1 or equal to 1.
In an embodiment, if the number of the detected abnormal leds is greater than 1, the detection circuit performs the first detection mode to locate the abnormal leds.
In an embodiment, if the number of the detected abnormal leds is equal to 1, the detection circuit performs the second detection mode or the third detection mode to locate the abnormal leds.
In an embodiment, in the first detection mode, when any one of the second connection lines is activated, the detection circuit sequentially detects whether the current between the m first connection lines and any one of the second connection lines is abnormal; when any one of the first connecting lines is activated, the detection circuit sequentially detects whether the current between the n second connecting lines and any one of the first connecting lines is abnormal.
In an embodiment, in the first detection mode, when any one of the second connection lines is activated, the level of the second connection line is opposite to the level of the remaining n-1 second connection lines in the n second connection lines; when any one of the first connecting lines is activated, the level of the first connecting line is opposite to the level of the rest m-1 first connecting lines in the m first connecting lines.
In an embodiment, in the first detection mode, when the detection circuit detects any one of the first connection lines, the level of the any one of the first connection lines is opposite to the level of the remaining m-1 first connection lines of the m first connection lines; when the detection circuit detects any second connecting wire, the level of the any second connecting wire is opposite to the level of the rest n-1 second connecting wires in the n second connecting wires.
In one embodiment, in the second detection mode, the detection circuit detects whether the current between the m first connection lines and any one of the second connection lines is abnormal.
In an embodiment, in the third detection mode, the detection circuit detects whether the current between the n second connection lines and any one of the first connection lines is abnormal.
In an embodiment, when the detection circuit executes the first detection mode, the abnormal condition that can be detected by the detection circuit includes an open circuit, a short circuit between any one of the first connection lines and an adjacent first connection line, a short circuit between any one of the second connection lines and an adjacent second connection line, a resistance of any one of the m×n light emitting diodes or a connection path thereof being too high, and a resistance of any one of the second connection lines being too high.
In an embodiment, when the detection circuit executes the second detection mode, the abnormal condition that can be detected by the detection circuit includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the second connection lines and an adjacent second connection line, a resistance of any one of the m×n light emitting diodes or a connection path thereof being too high, and a resistance of any one of the second connection lines being too high.
In an embodiment, when the detection circuit executes the third detection mode, the abnormal condition that can be detected by the detection circuit includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the first connection lines and an adjacent first connection line, a resistance of any one of the m×n light emitting diodes or a connection path thereof being too high, and a resistance of any one of the second connection lines being too high.
Another embodiment of the present invention is a method for detecting a light emitting diode display panel. In this embodiment, the method for detecting a light emitting diode display panel is used for detecting the light emitting diode display panel. The light emitting diode display panel comprises m x n light emitting diodes, wherein m and n are positive integers.
The detection method of the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively performs at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes to detect abnormal light emitting diodes.
In the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines; when any one of the m first connecting lines is activated, the detection circuit sequentially detects the n second connecting lines. In the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously. In the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines simultaneously.
In an embodiment, the detection circuit performs the second detection mode or the third detection mode to perform the anomaly detection, and then determines that the number of the detected abnormal leds is greater than 1 or equal to 1.
In one embodiment, if the number of detected abnormal leds is greater than 1, the detection circuit performs the first detection mode to locate abnormal leds.
In an embodiment, if the number of the abnormal leds detected is equal to 1, the detection circuit performs the second detection mode or the third detection mode to locate the abnormal leds.
In an embodiment, in the first detection mode, when any one of the second connection lines is activated, the detection circuit sequentially detects whether the current between the m first connection lines and any one of the second connection lines is abnormal; when any one of the first connecting lines is activated, the detection circuit sequentially detects whether the current between the n second connecting lines and any one of the first connecting lines is abnormal.
In an embodiment, in the first detection mode, when any one of the second connection lines is activated, the level of the second connection line is opposite to the level of the remaining n-1 second connection lines in the n second connection lines; when any one of the first connecting lines is activated, the level of the first connecting line is opposite to the level of the rest m-1 first connecting lines in the m first connecting lines.
In an embodiment, in the first detection mode, when the detection circuit detects the any one first connection line, the level of the any one first connection line is opposite to the level of the remaining m-1 first connection lines in the m first connection lines; when the detection circuit detects any second connecting wire, the level of the any second connecting wire is opposite to the level of the rest n-1 second connecting wires in the n second connecting wires.
In an embodiment, in the second detection mode, the detection circuit detects whether the current between the m first connection lines and any one of the second connection lines is abnormal.
In an embodiment, in the third detection mode, the detection circuit detects whether the current between the n second connection lines and any one of the first connection lines is abnormal.
In an embodiment, when the detection circuit executes the first detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and an adjacent first connection line, a short circuit between any one of the second connection lines and an adjacent second connection line, a resistance of any one of the m×n light emitting diodes or a connection path thereof being too high, and a resistance of any one of the second connection lines being too high.
In an embodiment, when the detection circuit executes the second detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the second connection lines and an adjacent second connection line, a resistance of any one of the m×n light emitting diodes or a connection path thereof being too high, and a resistance of any one of the second connection lines being too high.
In an embodiment, when the detection circuit executes the third detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the first connection lines and an adjacent first connection line, a too high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a too high resistance value of any one of the second connection lines.
Compared with the prior art, the LED display panel detection device and the LED display panel detection method of the invention selectively detect the abnormality of all LEDs of the LED display panel through three different detection modes by utilizing the output channel of the LED display driving circuit, not only can effectively detect various common abnormal conditions (such as open circuit, short circuit or over high resistance value and the like) of the LED display panel, but also can greatly shorten the detection time required for detecting all LEDs of the LED display panel so as to effectively improve the detection efficiency of the LED display panel. In addition, the invention can further determine whether the subsequent repairing action of the abnormal light-emitting diode is needed according to the detection result.
The advantages and spirit of the present invention will be further understood from the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a voltage difference versus current variation of a light emitting diode.
Fig. 2 is a schematic diagram illustrating the operation of the led display panel detection device according to the present invention in the first detection mode.
FIG. 3 is a schematic diagram illustrating the LED display panel detecting device according to the present invention operating in the second detecting mode.
Fig. 4 is a schematic diagram illustrating the operation of the led display panel inspection device according to the present invention in the third inspection mode.
Fig. 5 is a schematic diagram of an led display panel detection device applied to Open circuit (Open) detection of an led according to the present invention.
Fig. 6 is a schematic diagram of an led display panel detection device according to the present invention applied to Short circuit (Short) detection between a first connection line and a second connection line.
Fig. 7 is a schematic diagram of an led display panel detection device according to the present invention applied to Short circuit (Short) detection between two first connection lines.
Fig. 8 is a schematic diagram of the led display panel detection device of the present invention applied to Short circuit (Short) detection between two second connection lines.
Fig. 9 is a schematic diagram of the led display panel detecting device of the present invention for detecting whether the resistance value of the led or the coupling path thereof is too high.
Fig. 10 is a schematic diagram of the led display panel detecting device of the present invention for detecting whether the resistance value of the second connection line is too high.
Fig. 11 is a schematic diagram of a range section of the current detection result.
Fig. 12 is a flowchart of a method for inspecting a light emitting diode display panel according to another preferred embodiment of the present invention.
Description of main reference numerals:
S11-S18: step (a)
VTH: critical voltage
ITH: critical current
I: electric current
IH: electric current
IL: electric current
V: voltage (V)
VH: voltage (V)
VL: voltage (V)
TC: detection circuit
A1 to Am: first connecting wire
C1-Cn: second connecting wire
LED 11-LEDmn: light emitting diode
OP: open circuit
SH: short circuit
R: resistance value
PASS: through the detection zone
IS: short circuit judging current value
IR: high resistance judgment current value
IO: breaking judgment current value
HR: high resistance region
ID: electric current
VCA: voltage (V)
Detailed Description
An embodiment of the invention is a light emitting diode display panel detection device. In this embodiment, the light emitting diode display panel detection device is used for detecting the light emitting diode display panel. The led display panel adopts a passive driving method, but not limited to this.
Referring to fig. 1, fig. 1 is a schematic diagram of a voltage versus current variation curve of a light emitting diode. As shown in fig. 1, the current IL of the led corresponding to the voltage VL is relatively small before the voltage has reached the threshold voltage VTH. After the voltage exceeds the threshold voltage VTH, the current IH of the light emitting diode corresponding to the bias voltage VH is a normal current.
Next, please refer to fig. 2 to fig. 4. FIG. 2 is a schematic diagram of the LED display panel detecting device according to the present invention operating in a first detecting mode; FIG. 3 is a schematic diagram illustrating the LED display panel detecting device according to the present invention operating in the second detecting mode; fig. 4 is a schematic diagram illustrating the operation of the led display panel inspection device according to the present invention in the third inspection mode.
As shown in fig. 2 to 4, the light emitting diode display panel may include m×n light emitting diodes LED11 to LEDmn, where m and n are positive integers. The light-emitting diode display panel detection device comprises m first connecting lines A1-Am, n second connecting lines C1-Cn and a detection circuit TC.
It should be noted that each first connection line is coupled to the anodes of the n light emitting diodes respectively. That is, the first connection lines A1 are respectively coupled to the anodes of the n light emitting diodes LED11 to LED1 n; the first connecting wire A2 is respectively coupled with the anodes of the n light emitting diodes (LED 21-LED 2 n); the first connecting wire A3 is respectively coupled with the anodes of the n light emitting diodes (LED 31-LED 3 n); and so on, until the first connection line Am is respectively coupled with the anodes of the n light emitting diodes LEDm1 to LEDmn.
In addition, each second connecting wire is respectively coupled with the cathodes of the m light emitting diodes. That is, the second connection lines C1 are respectively coupled to the cathodes of the m light emitting diodes LED11 to LEDm 1; the second connecting wires C2 are respectively coupled with the cathodes of the m light emitting diodes (LED 12-LEDm 2); the second connecting wires C3 are respectively coupled with the cathodes of the m light emitting diodes (LED 13-LEDm 3); and so on, until the second connection lines Cn are respectively coupled with the cathodes of the m light emitting diodes LED1 n-LEDmn.
It should be noted that, the led display panel of the present invention adopts a passive driving method, which changes the voltage difference between the first connection lines A1 to Am and the second connection lines C1 to Cn to make the leds emit light. The detection circuit TC may selectively perform at least one of the first detection mode, the second detection mode, and the third detection mode on the m×n light emitting diodes LED11 to LEDmn to detect abnormal light emitting diodes.
As shown in fig. 2, in the first detection mode, when any one of the n second connection lines C1-Cn is activated, the detection circuit TC "sequentially" detects the m first connection lines A1-Am, where j=1-n; when any one of the m first connection lines A1 to Am is activated, the detection circuit TC detects the n second connection lines C1 to Cn "in sequence", where i=1 to m.
For example, when the second connection line C1 is activated (the level of the second connection line C1 is opposite to the levels of the remaining second connection lines C2 to Cn), the detection circuit TC "sequentially" detects the first connection line A1 (the level of the first connection line A1 is opposite to the levels of the remaining first connection lines A2 to Am), the first connection line A2 (the level of the first connection line A2 is opposite to the levels of the remaining first connection lines A1, A3 to Am), the first connection line A3 (the level of the first connection line A3 is opposite to the levels of the remaining first connection lines A1 to A2, A4 to Am), and … until the first connection line Am (the level of the first connection line Am is opposite to the levels of the remaining first connection lines A1 to a (m-1)).
Then, the operation is switched to the second connection line C2. When the second connection line C2 is activated (the level of the second connection line C2 is opposite to the levels of the remaining second connection lines C1, C3 to Cn), the detection circuit TC detects the first connection line A1 (the level of the first connection line A1 is opposite to the levels of the remaining first connection lines A2 to Am), the first connection line A2 (the level of the first connection line A2 is opposite to the levels of the remaining first connection lines A1, A3 to Am), the first connection line A3 (the level of the first connection line A3 is opposite to the levels of the remaining first connection lines A1 to A2, A4 to Am), …, and up to the first connection line Am (the level of the first connection line Am is opposite to the levels of the remaining first connection lines A1 to a (m-1)).
The operations of sequentially switching to the second connection lines C3-Cn can be analogized, so that the description thereof is omitted.
When the second connection lines C1-Cn are sequentially activated, the first connection lines A1-Am are sequentially activated.
When the first connection line A1 is activated (the level of the first connection line A1 is opposite to the levels of the remaining first connection lines A2 to Am), the detection circuit TC detects the second connection line C1 (the level of the second connection line C1 is opposite to the levels of the remaining second connection lines C2 to Cn), the second connection line C2 (the level of the second connection line C2 is opposite to the levels of the remaining second connection lines C1, C3 to Cn), the second connection line C3 (the level of the second connection line C3 is opposite to the levels of the remaining second connection lines C1 to C2, C4 to Cn), …, and up to the second connection line Cn (the level of the second connection line Cn is opposite to the levels of the remaining second connection lines C1 to C (n-1)).
Then, the first connection line A2 is switched to be operated. When the first connection line A2 is activated (the level of the first connection line A2 is opposite to the levels of the remaining first connection lines A1, A3 to Am), the detection circuit TC detects the second connection line C1 (the level of the second connection line C1 is opposite to the levels of the remaining second connection lines C2 to Cn), the second connection line C2 (the level of the second connection line C2 is opposite to the levels of the remaining second connection lines C1, C3 to Cn), the second connection line C3 (the level of the second connection line C3 is opposite to the levels of the remaining second connection lines C1 to C2, C4 to Cn), …, and up to the second connection line Cn (the level of the second connection line Cn is opposite to the levels of the remaining second connection lines C1 to C (n-1)).
The operations of sequentially switching to the first connection lines A3 to Am can be analogized in the following, and thus the description thereof is omitted.
In practical application, in the first detection mode, when the second connection line C1 is activated, the detection circuit TC "sequentially" detects whether the current between the first connection lines A1, A2, A3, …, am and the second connection line C1 is abnormal, and the levels of the second connection line C1 and the remaining second connection lines C2, C3, …, cn are opposite; when the first connection line A1 is activated, the detection circuit TC "sequentially" detects whether the current between the second connection lines C1, C2, C3, …, cn and the first connection line A1 is abnormal, and the levels of the first connection line A1 and the remaining first connection lines A2, A3, …, am are opposite. The rest can be analogized to the rest, so the description is omitted here.
Similarly, in the first detection mode, when the second connection line C2 is activated, the detection circuit TC "sequentially" detects whether the current between the first connection lines A1, A2, A3, …, am and the second connection line C2 is abnormal, and the level of the second connection line C2 is opposite to the level of the remaining second connection lines C1, C3, …, cn; when the first connection line A2 is activated, the detection circuit TC "sequentially" detects whether the current between the second connection lines C1, C2, C3, …, cn and the first connection line A2 is abnormal, and the levels of the first connection line A2 and the remaining first connection lines A1, A3, …, am are opposite. The rest can be analogized to the rest, so the description is omitted here.
In the first detection mode, when the detection circuit TC detects the first connection line A1, the first connection line A1 is opposite to the levels of the remaining first connection lines A2, A3, …, am; when the detection circuit TC detects the second connection line C1, the second connection line C1 is opposite to the remaining second connection lines C2, C3, …, cn. The rest can be analogized to the rest, so the description is omitted here.
Similarly, in the first detection mode, when the detection circuit TC detects the first connection line A2, the first connection line A2 is opposite to the levels of the remaining first connection lines A1, A3, …, am; when the detection circuit TC detects the second connection line C2, the second connection line C2 is opposite to the remaining second connection lines C1, C3, …, cn. The rest can be analogized to the rest, so the description is omitted here.
In practical applications, when the detection circuit TC executes the first detection mode, the detection circuit TC can detect various common abnormal conditions of the led display panel, such as, but not limited to, an open circuit of the led, a short circuit between the first connection line and an adjacent first connection line, a short circuit between the second connection line and an adjacent second connection line, an excessively high resistance of the led or the connection path, and an excessively high resistance of the second connection line.
As shown in fig. 3, in the second detection mode, when any one of the n second connection lines C1 to Cn is activated, the detection circuit TC detects the m first connection lines A1 to Am "simultaneously", where j=1 to n.
For example, when the second connection line C1 is activated (the level of the second connection line C1 is opposite to the levels of the other second connection lines C2-Cn), the detection circuit TC detects the first connection lines A1, A2, A3, …, am "simultaneously". Similarly, when the second connection line C2 is activated (the level of the second connection line C2 is opposite to the levels of the other second connection lines C1, C3-Cn), the detection circuit TC detects the first connection lines A1, A2, A3, …, am "simultaneously". The rest can be analogized to the rest, so the description is omitted here.
In practical application, in the second detection mode, when the second connection line C1 is activated (the level of the second connection line C1 is opposite to the levels of the other second connection lines C2-Cn), the detection circuit TC detects whether the current between the first connection lines A1, A2, A3, …, am and the second connection line C1 is abnormal. Similarly, when the second connection line C2 is activated (the level of the second connection line C2 is opposite to the levels of the other second connection lines C1, C3 to Cn), the detection circuit TC detects whether the current between the first connection lines A1, A2, A3, …, am and the second connection line C2 is abnormal. The rest can be analogized to the rest, so the description is omitted here.
When the detection circuit TC executes the second detection mode, the detection circuit TC can detect various common abnormal conditions of the led display panel, such as, but not limited to, an open led, a short circuit between the first connection line and the second connection line, a short circuit between the second connection line and an adjacent second connection line, an excessively high resistance of the led or the connection path, and an excessively high resistance of the second connection line.
As shown in fig. 4, in the third detection mode, when any one of the m first connection lines A1 to Am is activated, the detection circuit TC detects the n second connection lines C1 to Cn "simultaneously", wherein i=1 to m.
For example, when the first connection line A1 is activated (the level of the first connection line A1 is opposite to the levels of the other first connection lines A2 to Am), the detection circuit TC detects the second connection lines C1, C2, C3, …, cn "simultaneously". Similarly, when the first connection line A2 is activated (the level of the first connection line A2 is opposite to the levels of the other first connection lines A1, A3 to Am), the detection circuit TC detects the second connection lines C1, C2, C3, …, cn "simultaneously". The rest can be analogized to the rest, so the description is omitted here.
In practical application, in the third detection mode, when the first connection line A1 is activated (the level of the first connection line A1 is opposite to the levels of the other first connection lines A2 to Am), the detection circuit simultaneously detects whether the current between the second connection lines C1, C2, C3, …, cn and the first connection line A1 is abnormal. Similarly, when the first connection line A2 is activated (the level of the first connection line A2 is opposite to the levels of the other first connection lines A1, A3 to Am), the detection circuit simultaneously detects whether the current between the second connection lines C1, C2, C3, …, cn and the first connection line A2 is abnormal. The rest can be analogized to the rest, so the description is omitted here.
When the detection circuit TC executes the third detection mode, the detection circuit TC can detect various common abnormal conditions of the led display panel, such as, but not limited to, an open led, a short circuit between the first connection line and the second connection line, a short circuit between the first connection line and an adjacent first connection line, an excessively high resistance of the led or the connection path, and an excessively high resistance of the second connection line.
It should be noted that, the detection circuit TC of the present invention may first perform the second detection mode or the third detection mode to perform the anomaly detection, and then determine that the number of the detected abnormal leds is greater than 1 or equal to 1.
If the number of abnormal leds detected by the detection circuit TC is greater than 1, it indicates that there are a plurality of different leds on the led display panel, so the detection circuit TC needs to further execute a first detection mode for detecting the abnormal leds in more detail to locate the abnormal leds; if the number of the abnormal leds detected by the detecting circuit TC is equal to 1, which means that only one led of the led display panel has an abnormal condition, the detecting circuit TC only needs to execute the second detecting mode or the third detecting mode to successfully locate the abnormal led.
Therefore, the detection circuit TC of the invention can quickly and accurately find out one or more LEDs with abnormal conditions in the LED display panel, and further determine whether the follow-up repair action of the abnormal LEDs is needed according to the detection result.
Referring to fig. 5 to 10, fig. 5 to 10 are schematic diagrams of the led display panel detection device of the present invention applied to Open circuit (Open) detection, short circuit (Short) detection, short circuit detection between two adjacent first connection lines, short circuit detection between two adjacent second connection lines, whether the resistance value of the led or the coupling path thereof is too high, and whether the resistance value of the second connection line is too high.
As shown in fig. 5, the detection circuit TC may perform the first detection mode, the second detection mode, or the third detection mode to detect the occurrence of the open circuit OP of the light emitting diode LED 11.
For example, in the first detection mode, when the second connection line C1 is activated, the detection circuit TC can provide the voltage VH on the first connection line A1 and the zero voltage on the remaining first connection lines A2 to Am, and provide the zero voltage on the second connection line C1 and the voltage VH on the remaining second connection lines C2 to Cn, so as to detect whether the current of the first connection line A1 is far smaller than the current IH corresponding to the voltage VH. If the measured current is much smaller than the current IH, this indicates that there is an open circuit OP. The rest can be analogized to the rest, and are not repeated here.
As shown in fig. 6, the detection circuit TC may perform a first detection mode, a second detection mode, or a third detection mode to detect a phenomenon of occurrence of a short circuit SH between the first connection line A1 and the second connection line C1.
For example, in the second detection mode, when the second connection line C1 is activated, the detection circuit TC can provide the voltage VL on each of the first connection lines A1 to Am, and provide the zero voltage on the second connection line C1 and the voltage VH on the remaining second connection lines C2 to Cn, so as to detect whether the current of the first connection lines A1 to Am is substantially greater than the current IL corresponding to the voltage VL. If the measured current is much larger than the current IL, this indicates that there is a short circuit SH. The rest can be analogized to the rest, and are not repeated here.
As shown in fig. 7, the detection circuit TC may perform a first detection mode, a second detection mode, or a third detection mode to detect a phenomenon that a short circuit SH occurs between two adjacent first connection lines A1 and A2.
For example, in the first detection mode, when the second connection line C1 is activated, the detection circuit TC can provide the voltage VL on the first connection line A1 and zero voltages on the remaining first connection lines A2 to Am, and provide the voltage VH on the second connection line C1 and the remaining second connection lines C2 to Cn, so as to detect whether the current of the first connection line A1 is far greater than the current IL corresponding to the voltage VL; then, when switching to the first connection line A2, the detection circuit TC may provide the voltage VL at the first connection line A2 and zero voltages at the remaining first connection lines A1, A3 to Am, and provide the zero voltage at the second connection line C1 and the voltage VH at the remaining second connection lines C2 to Cn, so as to detect whether the current of the first connection line A2 is substantially greater than the current IL corresponding to the voltage VL. In this embodiment, the measured current of the first connection line A1 and the measured current of the first connection line A2 are substantially greater than the current IL, which is indicative of the occurrence of a short circuit SH between the adjacent first connection lines A1 and A2. The rest can be analogized to the rest, and are not repeated here.
As shown in fig. 8, the detection circuit TC may perform a first detection mode, a second detection mode, or a third detection mode to detect a phenomenon of a short circuit SH between two adjacent second connection lines C1 and C2.
For example, in the second detection mode, the detection circuit TC can provide the voltage VL on each of the first connection lines A1 to Am, and provide the zero voltage on the second connection line C1 and the voltage VH on the remaining second connection lines C2 to Cn, so as to detect whether the current of each of the first connection lines A1 to Am is far smaller than the current IH corresponding to the voltage VH; then, when switching to the second connection line C2, the detection circuit TC may provide the voltage VL at each of the first connection lines A1 to Am, and provide the zero voltage at the second connection line C2 and the voltage VH at the remaining second connection lines C1, C3 to Cn, so as to detect whether the current of the first connection lines A1 to Am is far smaller than the current IH corresponding to the voltage VH. In this embodiment, the measured current under the two switching conditions is much smaller than the current IH corresponding to the voltage VH, i.e. the short circuit SH between the adjacent second connection lines C1 and C2 occurs. The rest can be analogized to the rest, and are not repeated here.
As shown in fig. 9, the detection circuit TC may perform a first detection mode, a second detection mode, or a third detection mode to detect whether the resistance R of the light emitting diode (e.g., LED 11) or its coupling path is too high.
For example, in the second detection mode, the detection circuit TC can provide the voltage VH to the first connection lines A1 to Am, and provide the zero voltage to the second connection line C1 and the voltage VH to the remaining second connection lines C2 to Cn to detect whether the current of the first connection line A1 is smaller than the current IH corresponding to the voltage VH, and the current of the remaining first connection lines A2 to Am is smaller than the current IL corresponding to the voltage VL. If the current of the first connection line A1 is smaller than the current IH corresponding to the voltage VH and the current of the remaining first connection lines A2 to Am is smaller than the current IL corresponding to the voltage VL, the resistance R of the light emitting diode LED11 (or the coupling path thereof) is too high, which may result in insufficient light emitting brightness. The rest can be analogized to the rest, and are not repeated here.
As shown in fig. 10, the detection circuit TC may perform the first detection mode, the second detection mode, or the third detection mode to detect whether the resistance value R of the second connection line (e.g., C1) is too high. Too high a resistance value of the first connection line or the second connection line may possibly cause a phenomenon that the display brightness of the light emitting diode display panel is uneven.
For example, in the first detection mode, when the second connection line C1 is activated, the detection circuit TC can provide the voltage VH on the first connection line A1 and the zero voltage on the remaining first connection lines A2 to Am, and provide the zero voltage on the second connection line C1 and the voltage VH on the remaining second connection lines C2 to Cn, so as to detect whether the current of the first connection line A1 is smaller than the current IH corresponding to the voltage VH. Then, when switching to the first connection line A2, the detection circuit TC may provide the voltage VH on the first connection line A2 and provide the zero voltage on the remaining first connection lines A1, A3-Am to detect whether the current of the first connection line A2 is smaller than the current IH corresponding to the voltage VH. By analogy, since the resistance value R of the second connection line C1 is too high, the currents of the first connection lines A1 to Am detected by the detection circuit TC are smaller than the current IH. When the operation is switched to the other second connection lines C2 to Cn, the resistance R of the second connection lines C2 to Cn is not excessively high, so that the current of the first connection lines A1 to Am is not smaller than the current IH.
Referring to fig. 11, fig. 11 is a schematic diagram of a range section of the current detection result. As shown in fig. 11, when the above-described various abnormal phenomena occur, there is a different correspondence between the voltage and the current. IO is a breaking judgment current value; IS a short circuit judgment current value; IR is a high resistance judgment current value.
Under different voltages VCA, when the current ID is smaller than or equal to the breaking judgment current value IO, the phenomenon that the breaking OP occurs is represented; when the current ID ∈ Is equal to or greater than the short-circuit judgment current value Is, it means that the phenomenon of short-circuit SH occurs. In addition, since the excessively high resistance R causes a drop in the led voltage, a smaller high resistance judgment current IR (e.g., the high resistance region HR in fig. 11) is obtained under the same bias condition. As for the PASS detection region PASS, it means that no abnormal condition occurs, so that the PASS detection can be performed.
Another embodiment of the present invention is a method for detecting a light emitting diode display panel.
In this embodiment, the method for detecting a light emitting diode display panel is used for detecting the light emitting diode display panel. The light emitting diode display panel comprises m x n light emitting diodes, wherein m and n are positive integers. The detection method of the light-emitting diode display panel comprises the following steps:
Providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit TC selectively performs at least one of the first detection mode, the second detection mode, and the third detection mode on the m×n light emitting diodes to detect abnormal light emitting diodes.
In the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines; when any one of the m first connecting lines is activated, the detection circuit sequentially detects the n second connecting lines. In the second detection mode, the detection circuit detects the m first connection lines simultaneously when the second connection line is activated. In the third detection mode, when any one of the m first connection lines is activated, the detection circuit detects the n second connection lines simultaneously.
Referring to fig. 12, fig. 12 is a flowchart of a method for detecting an led display panel in this embodiment.
As shown in fig. 12, the method for detecting the led display panel may include the following steps:
Step S11: the detection circuit is switched to a second detection mode or a third detection mode;
step S12: performing abnormality detection;
if the abnormality detection result in step S12 is yes, step S13 is executed: judging whether the number of the detected abnormal LEDs is larger than 1; if the abnormality detection result in step S12 is no, step S16 is executed: finishing abnormality detection;
if the determination result in step S13 is yes, that is, the number of abnormal leds is greater than 1, steps S14 to S16 are sequentially executed: after the detection circuit is switched to a first detection mode and the abnormal light emitting diode is positioned, the abnormality detection is completed; if the determination result in step S13 is no, that is, the number of abnormal leds is equal to 1, steps S15 and S16 are directly executed: after the abnormal light emitting diode is positioned, finishing the abnormal detection;
step S17: after the abnormality detection is completed, judging whether the abnormal light-emitting diode needs to be repaired or not;
if the determination result in step S17 is yes, step S18 is executed: repairing the abnormal light emitting diode; and if the judgment result in the step S17 is negative, ending the detection flow of the whole light-emitting diode display panel.
Compared with the prior art, the LED display panel detection device and the LED display panel detection method of the invention selectively detect the abnormality of all LEDs of the LED display panel through three different detection modes by utilizing the output channel of the LED display driving circuit, not only can effectively detect various common abnormal conditions (such as open circuit, short circuit or over high resistance value and the like) of the LED display panel, but also can greatly shorten the detection time required for detecting all LEDs of the LED display panel so as to effectively improve the detection efficiency of the LED display panel. In addition, the invention can further determine whether the subsequent repairing action of the abnormal light-emitting diode is needed according to the detection result.
In view of the foregoing detailed description of the preferred embodiments, it is intended that the features and spirit of the invention be more clearly described rather than limiting the scope of the invention as defined by the foregoing description of the preferred embodiments. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.
Claims (12)
1. The method for detecting the light-emitting diode display panel is used for detecting the light-emitting diode display panel and is characterized in that the light-emitting diode display panel comprises m and n light-emitting diodes, wherein m and n are positive integers, and the method for detecting the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively executes at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit simultaneously detects the n second connection lines, and in the first detection mode, when any one of the second connection lines is activated, the levels of the any one of the second connection lines are opposite to those of the rest n-1 second connection lines; when any one of the first connecting lines is activated, the level of the first connecting line is opposite to the level of the rest m-1 first connecting lines in the m first connecting lines.
2. The method for detecting the light-emitting diode display panel is used for detecting the light-emitting diode display panel and is characterized in that the light-emitting diode display panel comprises m and n light-emitting diodes, wherein m and n are positive integers, and the method for detecting the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively executes at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and in the first detection mode, when the detection circuit detects any one of the first connection lines, the level of any one of the first connection lines is opposite to the level of the rest m-1 first connection lines in the m first connection lines; when the detection circuit detects any second connecting wire, the level of the any second connecting wire is opposite to the level of the rest n-1 second connecting wires in the n second connecting wires.
3. The method for detecting the light-emitting diode display panel is used for detecting the light-emitting diode display panel and is characterized in that the light-emitting diode display panel comprises m and n light-emitting diodes, wherein m and n are positive integers, and the method for detecting the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively executes at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit simultaneously detects the n second connection lines, and in the third detection mode, the detection circuit simultaneously detects whether the current between the n second connection lines and any one of the first connection lines is abnormal.
4. The method for detecting the light-emitting diode display panel is used for detecting the light-emitting diode display panel and is characterized in that the light-emitting diode display panel comprises m and n light-emitting diodes, wherein m and n are positive integers, and the method for detecting the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively executes at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and when the detection circuit executes the first detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and an adjacent first connection line, a short circuit between any one of the second connection lines and an adjacent second connection line, a too high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a too high resistance value of any one of the second connection lines.
5. The method for detecting the light-emitting diode display panel is used for detecting the light-emitting diode display panel and is characterized in that the light-emitting diode display panel comprises m and n light-emitting diodes, wherein m and n are positive integers, and the method for detecting the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively executes at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and when the detection circuit executes the second detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the second connection lines and an adjacent second connection line, a high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a high resistance value of any one of the second connection lines.
6. The method for detecting the light-emitting diode display panel is used for detecting the light-emitting diode display panel and is characterized in that the light-emitting diode display panel comprises m and n light-emitting diodes, wherein m and n are positive integers, and the method for detecting the light-emitting diode display panel comprises the following steps:
providing m first connecting lines, n second connecting lines and a detection circuit, wherein each first connecting line is respectively coupled with the anodes of the n light emitting diodes, and each second connecting line is respectively coupled with the cathodes of the m light emitting diodes; and
the detection circuit selectively executes at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and when the detection circuit executes the third detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the first connection lines and an adjacent first connection line, a too high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a too high resistance value of any one of the second connection lines.
7. The utility model provides a light emitting diode display panel detection device for detect a light emitting diode display panel, characterized in that, this light emitting diode display panel contains m and n emitting diode, and wherein m and n are positive integer, and this light emitting diode display panel detection device includes:
m first connecting wires, each of which is coupled with the anodes of n light emitting diodes respectively;
n second connecting wires, each of which is coupled with the cathodes of the m light emitting diodes respectively; and
a detection circuit for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit simultaneously detects the n second connection lines, and in the first detection mode, when any one of the second connection lines is activated, the levels of the any one of the second connection lines are opposite to those of the rest n-1 second connection lines; when any one of the first connecting lines is activated, the level of the first connecting line is opposite to the level of the rest m-1 first connecting lines in the m first connecting lines.
8. The utility model provides a light emitting diode display panel detection device for detect a light emitting diode display panel, characterized in that, this light emitting diode display panel contains m and n emitting diode, and wherein m and n are positive integer, and this light emitting diode display panel detection device includes:
m first connecting wires, each of which is coupled with the anodes of n light emitting diodes respectively;
n second connecting wires, each of which is coupled with the cathodes of the m light emitting diodes respectively; and
a detection circuit for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and in the first detection mode, when the detection circuit detects any one of the first connection lines, the level of any one of the first connection lines is opposite to the level of the rest m-1 first connection lines in the m first connection lines; when the detection circuit detects any second connecting wire, the level of the any second connecting wire is opposite to the level of the rest n-1 second connecting wires in the n second connecting wires.
9. The utility model provides a light emitting diode display panel detection device for detect a light emitting diode display panel, characterized in that, this light emitting diode display panel contains m and n emitting diode, and wherein m and n are positive integer, and this light emitting diode display panel detection device includes:
m first connecting wires, each of which is coupled with the anodes of n light emitting diodes respectively;
n second connecting wires, each of which is coupled with the cathodes of the m light emitting diodes respectively; and
a detection circuit for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit simultaneously detects the n second connection lines, and in the third detection mode, the detection circuit simultaneously detects whether the current between the n second connection lines and any one of the first connection lines is abnormal.
10. The utility model provides a light emitting diode display panel detection device for detect a light emitting diode display panel, characterized in that, this light emitting diode display panel contains m and n emitting diode, and wherein m and n are positive integer, and this light emitting diode display panel detection device includes:
m first connecting wires, each of which is coupled with the anodes of n light emitting diodes respectively;
n second connecting wires, each of which is coupled with the cathodes of the m light emitting diodes respectively; and
a detection circuit for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and when the detection circuit executes the first detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and an adjacent first connection line, a short circuit between any one of the second connection lines and an adjacent second connection line, a too high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a too high resistance value of any one of the second connection lines.
11. The utility model provides a light emitting diode display panel detection device for detect a light emitting diode display panel, characterized in that, this light emitting diode display panel contains m and n emitting diode, and wherein m and n are positive integer, and this light emitting diode display panel detection device includes:
m first connecting wires, each of which is coupled with the anodes of n light emitting diodes respectively;
n second connecting wires, each of which is coupled with the cathodes of the m light emitting diodes respectively; and
a detection circuit for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and when the detection circuit executes the second detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the second connection lines and an adjacent second connection line, a high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a high resistance value of any one of the second connection lines.
12. The utility model provides a light emitting diode display panel detection device for detect a light emitting diode display panel, characterized in that, this light emitting diode display panel contains m and n emitting diode, and wherein m and n are positive integer, and this light emitting diode display panel detection device includes:
m first connecting wires, each of which is coupled with the anodes of n light emitting diodes respectively;
n second connecting wires, each of which is coupled with the cathodes of the m light emitting diodes respectively; and
a detection circuit for selectively executing at least one of a first detection mode, a second detection mode and a third detection mode on the m×n light emitting diodes;
in the first detection mode, when any one of the n second connection lines is activated, the detection circuit sequentially detects the m first connection lines, and when any one of the m first connection lines is activated, the detection circuit sequentially detects the n second connection lines; in the second detection mode, when any one of the second connection lines is activated, the detection circuit detects the m first connection lines simultaneously; in the third detection mode, when any one of the first connection lines is activated, the detection circuit detects the n second connection lines at the same time, and when the detection circuit executes the third detection mode, the abnormal condition that the detection circuit can detect includes an open circuit, a short circuit between any one of the first connection lines and any one of the second connection lines, a short circuit between any one of the first connection lines and an adjacent first connection line, a too high resistance value of any one of the m×n light emitting diodes or a connection path thereof, and a too high resistance value of any one of the second connection lines.
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| TW108106561 | 2019-02-26 | ||
| TW108106561A TWI722391B (en) | 2019-02-26 | 2019-02-26 | Light-emitting diode display panel testing device and light-emitting diode display panel testing method |
| CN201910311472.1A CN111613158B (en) | 2019-02-26 | 2019-04-18 | Light-emitting diode display panel detection device and detection method |
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| CN201910311472.1A Division CN111613158B (en) | 2019-02-26 | 2019-04-18 | Light-emitting diode display panel detection device and detection method |
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| CN202310252974.8A Pending CN116030742A (en) | 2019-02-26 | 2019-04-18 | Light-emitting diode display panel detection device and detection method |
| CN201910311472.1A Active CN111613158B (en) | 2019-02-26 | 2019-04-18 | Light-emitting diode display panel detection device and detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1187774A (en) * | 1997-07-09 | 1999-03-30 | Nichia Chem Ind Ltd | Led display device and semiconductor device |
| ATE470214T1 (en) * | 2000-07-28 | 2010-06-15 | Nichia Corp | DISPLAY CONTROL CIRCUIT AND DISPLAY DEVICE |
| TWI299849B (en) * | 2004-07-07 | 2008-08-11 | Chi Mei Optoelectronics Corp | Circuit architecture with a testing function for use in a display panel and method of making the same |
| CN100516992C (en) * | 2006-08-18 | 2009-07-22 | 群康科技(深圳)有限公司 | Backlight open circuit protection circuit |
| TWM309184U (en) * | 2006-10-24 | 2007-04-01 | Niko Semiconductor Co Ltd | Feedback and protection circuit of backlight device of liquid crystal panel |
| TWI409772B (en) * | 2008-10-06 | 2013-09-21 | Innolux Corp | Pixel structure, display panel and driving methods thereof |
| US8248356B2 (en) * | 2008-10-24 | 2012-08-21 | Au Optronics Corp. | Driving circuit for detecting line short defects |
| KR101955034B1 (en) * | 2011-12-07 | 2019-03-07 | 매그나칩 반도체 유한회사 | Detecting ciurcuit for short of led array and led driver apparatus having the same in |
| JP6108762B2 (en) * | 2012-10-26 | 2017-04-05 | 三菱電機株式会社 | Display device |
| TWI543139B (en) * | 2015-02-13 | 2016-07-21 | 明陽半導體股份有限公司 | Driving device for display panel |
| TWI581238B (en) * | 2015-07-07 | 2017-05-01 | Light emitting diode display system | |
| US10223962B2 (en) * | 2016-03-21 | 2019-03-05 | X-Celeprint Limited | Display with fused LEDs |
| KR102246926B1 (en) * | 2016-11-09 | 2021-04-30 | 삼성전자주식회사 | Led display module and display apparatus |
| TWI643175B (en) * | 2018-03-06 | 2018-12-01 | 友達光電股份有限公司 | Micro led display panel and driving method |
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2019
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- 2019-04-18 CN CN202310252974.8A patent/CN116030742A/en active Pending
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| CN111613158A (en) | 2020-09-01 |
| CN111613158B (en) | 2023-05-26 |
| TWI722391B (en) | 2021-03-21 |
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