TWI728749B - Backlight module and repairing method thereof - Google Patents

Abstract

A backlight module includes a first driving circuit, a first light-emitting unit, a second driving circuit and a second light-emitting unit. The first driving circuit has a first node and emits a first driving signal by the first node. The first light-emitting unit is provided with a first terminal and a second terminal. The first terminal of the first light-emitting unit is connected with the first node and the first light-emitting unit is lightened based on the first driving signal under a first mode. The second driving circuit is connected with the first node and emits a second driving signal. The second light-emitting unit is provided with a first terminal and a second terminal. The first terminal of the second light-emitting unit is connected with the second driving circuit and the second light-emitting unit is lightened based on the first driving signal and the second driving signal under a second mode.

Description

Light-emitting module and repairing method thereof

The invention relates to a light-emitting module using a second driving circuit and a second light-emitting unit to repair a first light-emitting unit and a repair method thereof.

Recently, manufacturers intend to reduce the size of light-emitting diodes to micro light-emitting diodes (micro light-emitting diode, micro-LED), and micro-emitting diodes are applied to displays. However, the micro light-emitting diode may fail during mass transfer, causing some pixels of the display to fail to operate normally. Therefore, proper detection and repair steps are very important.

The prior art is to preset a spare light-emitting diode and a forbidden zone (forbidden area), in case of the failure of the micro light emitting diode. When the micro-light-emitting diode fails, use laser to cut the restricted area to make the micro-light-emitting diode open and the spare light-emitting diode to conduct. However, the setting of the restricted area affects the resolution of the display area, and the laser is used to Cutting the restricted area above the panel will cause the organic layer of the panel to be destroyed and splashed out.

In summary, the inventor of the present invention thought about and designed a light-emitting module and its repairing method, in order to improve the deficiency of the conventional technology, and further enhance the application and utilization in the industry.

In view of the above-mentioned conventional problems, the purpose of the present invention is to provide a light-emitting module and a repair method thereof to solve the problems faced by the conventional technology.

Based on the above objective, the present invention provides a light emitting module, which includes a first driving circuit, a first light emitting unit, a second driving circuit, and a second light emitting unit. The first driving circuit has a first node, and sends a first driving signal through the first node. The first light-emitting unit has a first end and a second end. The first end of the first light-emitting unit is connected to the first node and emits light according to the first driving signal in the first mode. The second driving unit is connected to the first node and sends a second driving signal. The second light emitting unit has a first end and a second end. The first end of the second light emitting unit is connected to the second driving circuit and emits light according to the first driving signal and the second driving signal in the second mode.

In the embodiment of the present invention, in the first mode, the first driving circuit is activated and the second driving circuit is turned off, and the first light-emitting unit emits light; in the second mode, the first driving circuit and the second driving circuit are activated, and the second light-emitting The unit emits light.

In the embodiment of the present invention, the second end of the first light-emitting unit and the second end of the second light-emitting unit are connected to each other.

In an embodiment of the present invention, the light-emitting module of the present invention further includes a common signal line and a high voltage line, the common signal line is connected to the first driving circuit and the second driving circuit, and the high voltage line is connected to the second driving circuit.

In the embodiment of the present invention, there is a first cutting point between the first node and the first light-emitting unit, and the second driving circuit has a plurality of second cutting points.

In the embodiment of the present invention, the second driving circuit includes a first transistor, a second transistor, a first resistor, and a second resistor. The first terminal of the first transistor is connected to the first node, and the first terminal of the first transistor is connected to the first node. The two ends are connected to the second light-emitting unit, the first end of the second transistor is connected to the control end of the first transistor, The control end of the second transistor is connected to the first end of the first resistor, the second end of the second transistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the second end of the first resistor.

In an embodiment of the present invention, the resistance value of the first resistor is greater than the resistance value of the second resistor.

In an embodiment of the present invention, the light-emitting module of the present invention further includes a DC low voltage line and a DC high voltage line, the DC low voltage line is connected to the second end of the first resistor and the second resistor, and the DC high voltage line is connected to the first resistor. Transistor and second transistor.

Based on the above objective, the present invention provides a method for repairing a light-emitting module, which includes: providing a first driving circuit and a first light-emitting unit connected to the first driving circuit, and a first node exists between the first driving circuit and the first light-emitting unit , There is a first cutting point between the first node and the first light-emitting unit, the first driving circuit emits a first driving signal in the first mode, and the first light-emitting unit emits light according to the first driving signal in the first mode; A light-emitting unit, if the first light-emitting unit fails, a second driving circuit and a second light-emitting unit connected to the second driving circuit are provided. The second driving circuit is connected to the first node and has a plurality of second cutting points; cutting the first cutting point And a plurality of second cutting points, the first driving circuit and the first light-emitting unit are disconnected, and the second driving circuit and the second light-emitting unit are turned on; the second driving circuit sends a second driving signal to the second light-emitting unit, and the second light-emitting unit is at In the second mode, light is emitted according to the first driving signal and the second driving signal.

In the embodiment of the present invention, in the step of connecting the second driving circuit to the first node, the second driving circuit is turned off.

In an embodiment of the present invention, in the step of connecting the second driving circuit to the first node, the second ends of the first light-emitting unit and the second light-emitting unit are connected to each other.

In an embodiment of the present invention, the repair method of the light-emitting module of the present invention further includes a common signal line and a high voltage line, the common signal line is connected to the first driving circuit and the second driving circuit, and the high voltage line is connected to the second driving circuit.

In the embodiment of the present invention, the second driving circuit includes a first transistor, a second transistor, a first resistor, and a second resistor. The first terminal of the first transistor is connected to the first node, and the first terminal of the first transistor is connected to the first node. The two ends are connected to the second light-emitting unit, the first end of the second transistor is connected to the control end of the first transistor, the control end of the second transistor is connected to the first end of the first resistor, and the second end of the second transistor is connected to The first end of the second resistor and the second end of the second resistor are connected to the second end of the first resistor.

In an embodiment of the present invention, the resistance value of the first resistor is greater than the resistance value of the second resistor.

In the embodiment of the present invention, the repair method of the light-emitting module of the present invention further includes a DC low voltage line and a DC high voltage line, the DC low voltage line is connected to the second end of the first resistor and the second resistor, and the DC high voltage line Connect the first transistor and the second transistor.

In summary, the light-emitting module and the repair method of the present invention use the second driving circuit and the second light-emitting unit to repair the failure of the first light-emitting unit, and will not affect the high-resolution development of the display.

10, 11: the first drive circuit

20, 21: second drive circuit

C: Capacitance

C1: The first cutting point

C2: second cutting point

D1, D2, O1, O2, O3, O4: first end

DI1: The first light-emitting unit

DI2: The second light-emitting unit

DC_L: DC low voltage line

DC_H: DC high voltage line

EM: Shared signal line

VG_H: High voltage line

VDD: The working voltage terminal of the display panel

VSS: common ground voltage terminal

G1, G2: control terminal

N1: the first node

R1: first resistance

R2: second resistor

S1, S2, W1, W2, W3, W4: second end

S11~S16: steps

T: Transistor

T1: The first transistor

T2: second transistor

Figure 1 is a layout diagram of the first embodiment of the light-emitting module of the present invention.

Figure 2 is a wiring diagram of the first embodiment of the light-emitting module of the present invention.

FIG. 3A is a schematic diagram of the first embodiment of the light emitting module of the present invention in the first mode.

FIG. 3B is a schematic diagram of the first embodiment of the light emitting module of the present invention in the second mode.

FIG. 4 is a flowchart of the repair method of the light-emitting module of the present invention.

FIG. 5 is a layout diagram of the second embodiment of the light-emitting module of the present invention.

FIG. 6 is a configuration diagram of the third embodiment of the light-emitting module of the present invention.

FIG. 7 is a configuration diagram of the fourth embodiment of the light-emitting module of the present invention.

The advantages, features, and technical methods of the present invention will be described in more detail with reference to exemplary embodiments and the accompanying drawings to make it easier to understand, and the present invention can be implemented in different forms, so it should not be understood to be limited to what is here. The stated embodiments, on the contrary, for those with ordinary knowledge in the technical field, the provided embodiments will make this disclosure more thorough, comprehensive and complete to convey the meaning of the present invention Scope, and the present invention will only be defined by the appended patent scope.

It should be understood that although the terms "first", "second", etc. may be used in the present invention to describe various elements, components, regions, layers and/or parts, these elements, components, regions, layers and/or parts Should not be restricted by these terms. These terms are only used to distinguish one element, component, region, layer and/or section from another element, component, region, layer and/or section. Therefore, the "first element", "first part", "first area", "first layer" and/or "first part" discussed below can be referred to as "second element", "second part" , "Second Area", "Second Layer" and/or "Second Part" without departing from the spirit and teachings of the present invention.

In addition, the terms "including" and/or "including" refer to the existence of the described features, regions, wholes, steps, operations, elements and/or components, but do not exclude one or more other features, regions, wholes, steps, operations , The presence or addition of elements, components, and/or combinations thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present invention have the same meanings as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having definitions consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or overly formal Unless explicitly defined as such in this article.

Please refer to Figures 1 to 3B, which are the layout diagram of the first embodiment of the light-emitting module of the present invention, the wiring diagram of the first embodiment of the light-emitting module of the present invention, and the light-emitting module of the present invention. The schematic diagram of the first embodiment of the module in the first mode and the schematic diagram of the first embodiment of the light-emitting module of the present invention in the second mode. As shown in FIGS. 1 and 2, the light-emitting module of the present invention includes a first driving circuit 10, a first light-emitting unit DI1, a second driving circuit 20, and a second light-emitting unit DI2. The first driving circuit 10 has a first node N1, and sends a first driving signal through the first node N1. The first light-emitting unit DI1 has a first terminal O3 and a second terminal W3. The first terminal O3 of the first light-emitting unit DI1 is connected to the first node N1 and emits light according to the first driving signal DR1 in the first mode. The second driving unit 20 is connected to the first node N1 and sends a second driving signal. The second light-emitting unit DI2 has a first terminal O4 and a second terminal W4. The first terminal O4 of the second light-emitting unit DI2 is connected to the second driving circuit 20, and in the second mode according to the first driving signal DR1 and the second driving signal DR2 and glow.

The second driving circuit 20 includes a first transistor T1, a second transistor T2, a first resistor R1, and a second resistor R2. The first terminal D1 of the first transistor T1 is connected to the first node N1, and the first transistor T1 is connected to the first node N1. The second terminal S1 of T1 is connected to the first terminal O4 of the second light-emitting unit DI2, the first terminal D2 of the second transistor T2 is connected to the control terminal G1 of the first transistor T1, and the control terminal G2 of the second transistor T2 is connected to the The first terminal O1 of a resistor R1 and the control terminal G1 of the first transistor T1, the second terminal S2 of the second transistor T2 is connected to the first terminal O2 of the second resistor R2, and the second terminal W2 of the second resistor R2 is connected to The second end W1 of the first resistor R1 is connected, and the resistance value of the first resistor R1 is greater than the resistance value of the second resistor R2; in addition, the light-emitting module of the present invention further includes a direct current low voltage line DC_L and a direct current high voltage line DC_H. The low voltage line DC_L is connected to the second terminal W1 of the first resistor R1 and the second terminal W2 of the second resistor R2, and the DC high voltage line DC_H is connected to the control terminal G1 of the first transistor T1 and the first terminal of the second transistor T2 D2 and the control terminal G2 make the second driving circuit 20 and the second light-emitting unit DI2 appear in a non-conducting state through the DC low voltage line DC_L and the DC high voltage line DC_H.

It should be noted that there is a first cutting point C1 between the first node N1 and the first light-emitting unit DI1, the second driving circuit 20 has a plurality of second cutting points C2, and the number of the plurality of second cutting points C2 is based on the The circuit configuration of the second driving circuit 20 is adjusted, and is not limited to the scope of the present invention. The second terminal W3 of the first light-emitting unit DI1 and the second terminal W4 of the second light-emitting unit DI2 are used to receive a low voltage, and they can also be connected to each other but are not limited thereto. The first light-emitting unit DI1 and the second light-emitting unit DI2 can be horizontal light-emitting diodes, flip-chip light-emitting diodes, vertical light-emitting diodes or other electronic components, and are not limited to the scope of the present invention; The first transistor T1 and the second transistor T2 may include thin film transistors (TFT), bottom-gate transistors, top-gate transistors, and three-dimensional transistors. The vertical TFT can of course also be other suitable transistors, and is not limited to the scope of the present invention; in addition, the first driving circuit 10 is composed of a plurality of transistors T and capacitors C. The first The first driving circuit 10 shown in the figure is only an example, and it can also have other preferred configurations, and is not limited to the scope of the present invention. Please refer to Figure 2, there is a first line segment L1 between the first node N1 and the first light-emitting unit DI1, a second line segment L2 between the first node N1 and the first transistor T1, and the DC high voltage line DC_H There is a third line segment L3 between the first transistor T1 and the first line segment L1, the second line segment L2 and the third line segment L3 are adjacently arranged so that it can be cut to form multiple cutting points C1 and Cutting point C2.

As shown in Figures 3A and 3B, the operation of the light-emitting module of the present invention is described as follows: (1) As shown in Figure 3A, the first light-emitting unit DI1 is normal, and the first driving circuit 10 is activated to emit the first Driving signal DR1, the first light emitting unit DI1 emits light according to the first driving signal DR1 in the first mode; at this time, the second driving circuit 20 is turned off, the first transistor T1 and the second transistor T2 are not turned on, and the second Drive circuit 20 and the second light-emitting unit DI2 are in a non-conducting state. (2) As shown in Figure 3B, the first light-emitting unit DI1 is faulty, the first cutting point C1 and the plurality of second cutting points C2 are cut, the first driving circuit 10 and the first light-emitting unit DI1 are open, and the first The driving circuit 10 is still activated, and the first driving signal DR1 issued by the first driving circuit 10 flows to the first transistor T1. Because the DC high voltage line DC_H is cut off, the first transistor T1 and the second transistor T2 are not Receiving the signal of the DC high voltage line DC_H, the second transistor T2 is turned on (the second driving circuit 20 is activated, and the second driving circuit 20 and the second light-emitting unit DI2 are in a conductive state), and the second transistor T2 sends out the second driving signal DR2 To the first transistor T1, the first transistor T1 is turned on by the first driving signal DR1 and the second driving signal DR2, the first transistor T1 receives the first driving signal DR1 and the second driving signal DR2, and the second light emitting In the second mode, the unit DI2 emits light according to the first driving signal DR1 and the second driving signal DR2.

Please refer to FIG. 4, which is a flowchart of the repair method of the light-emitting module of the present invention. As shown in Figure 4, with Figures 1 to 3B, the repair method of the light-emitting module of the present invention is described as follows; (1) Step S11: a large number of first light-emitting units DI1 are transferred to the display panel, and the display panel has The plurality of first driving circuits 10 connect and drive the plurality of first light-emitting units DI1 to emit light; the display panel has a plurality of second driving circuits 20 and the second light-emitting units DI2 connected to each of the second driving circuits 20. There is a first node N1 between each first driving circuit 10 and each first light-emitting unit DI1, a first cutting point C1 is between the first node N1 and the first light-emitting unit DI1, and each first driving circuit 10 is in the first mode. The first driving signal DR1 is issued, and each first light-emitting unit DI1 emits light according to the first driving signal DR1 in the first mode.

(2) Step S12: Detect each of the first light-emitting units DI1 of the display panel to determine whether some of the first light-emitting units DI1 are normal and some of the first light-emitting units DI1 are faulty.

(3) Step S13: Connect each second drive circuit 20 to the first node N1 of each first drive circuit 10 to which the failed first light-emitting unit DI1 belongs, and each second drive circuit 20 has a plurality of second cuts Point C2; at this time, each first driving circuit 10 and each first light-emitting unit DI1 are still in a conductive state, each second driving circuit 20 is off, and the second end W3 of each first light-emitting unit DI1 and each second light-emitting unit The second ends W4 of DI2 are connected to each other.

(4) Step S14: Use a laser to cut the first cutting point C1 and a plurality of second cutting points C2 of each first driving circuit 10 to which the first light-emitting unit DI1 belongs; specifically, from the back side of the display panel ( (Close to the side of the substrate) perform laser cutting to disconnect the metal layer between the first transistor T1 and the DC high-voltage line DC_H, and disconnect the metal layer between the second transistor T2 and the DC high-voltage line DC_H, The metal layer between the first driving circuit 10 and the first light-emitting unit DI1 is disconnected, the first driving circuit 10 and the first light-emitting unit DI1 are disconnected, the first transistor T1 and the second transistor T2 are both turned on, and the second driving circuit 20 and the second light-emitting unit DI2 are turned on, the second driving circuit 20 sends out a second driving signal DR2 to the second light-emitting unit DI2, and the second light-emitting unit DI2 is in the second mode according to the first driving signal DR1 and the second driving signal DR2. Glow.

(5) Step S15: Perform the detection of the multiple first light-emitting units DI1 and the multiple second light-emitting units DI2 of the display panel again. For example, the detection can be optical detection by an optical microscope, of course, it can also be other preferred ones. The detection method is not limited to the scope of the present invention.

(6) Step S16: After the detection, if the yield rate of the display panel is good, perform other process procedures of the display panel; if the yield rate of the display panel is not good, return to step S12.

In summary, the repair method of the light-emitting module of the present invention uses a one-time laser cutting of the first cutting point C1 and a plurality of second cutting points C2, without the welding process and multiple laser cuttings, which simplifies the process step.

Please refer to FIG. 5, which is a configuration diagram of the second embodiment of the light-emitting module of the present invention. In this embodiment, the configuration of the elements with the same reference signs is similar to that described above, and the similarities are not repeated here.

As shown in Figure 5, the difference between the second embodiment of the present invention and the first embodiment: the first terminal D1 of the first transistor T1 and the first terminal O3 of the first light-emitting unit DI1 are connected to the operation of the display panel The voltage terminal VDD, the second terminal W3 of the first light-emitting unit DI1 and the second terminal W4 of the second light-emitting unit DI2 are connected to the first node N1, and the transistor T of the first driving circuit 10 is connected to the common ground voltage terminal VSS.

Please refer to FIG. 6, which is a configuration diagram of the third embodiment of the light-emitting module of the present invention. In this embodiment, the configuration of the elements with the same reference signs is similar to the foregoing, and the similarities are not repeated here.

As shown in Fig. 6, the difference between the third embodiment of the present invention and the first embodiment: the common signal line EM and the high voltage line VG_H, the common signal line EM connects the first driving circuit 11 and the second driving circuit 21 , The high voltage line VG_H is connected to the second driving circuit 21; specifically, the common signal line EM is connected to the transistor T of the first driving circuit 11, and is connected to the second end W2 of the second resistor R2 and the second end W2 of the first resistor R1. The two terminals W1 and the high voltage line VG_H are connected to the control terminal G1 of the first transistor T1 and the first terminal D2 and the control terminal G2 of the second transistor T2. In other words, the first driving circuit 11 and the second driving circuit 21 share a common signal line EM, which simplifies the circuit configuration.

Please refer to FIG. 7, which is a configuration diagram of the fourth embodiment of the light-emitting module of the present invention. In this embodiment, the configuration of the elements with the same reference signs is similar to the foregoing, and the similarities are not repeated here.

As shown in Figure 7, the difference between the fourth embodiment of the present invention and the third embodiment: the first terminal O3 of the first light-emitting unit DI1 and the first terminal O4 of the second light-emitting unit DI2 are connected to the display panel Working voltage terminal VDD, the second terminal W4 of the second light-emitting unit DI2 is connected to the first terminal D1 of the first transistor T1, and the third transistor T3 is connected to the common signal line EM, the second terminal W3 of the first light-emitting unit DI1, and the first terminal D1. A transistor T of the driving circuit 11, and the transistor T of the first driving circuit 11 is connected to the common ground voltage terminal VSS.

As mentioned above, the light-emitting module and the repair method of the present invention use the second driving circuit 20 and the second light-emitting unit DI2 to repair the failure of the first light-emitting unit DI1, which will not affect the high-resolution development of the display, and it will not The process to be welded.

The above descriptions are merely illustrative and not restrictive. Any equivalent modifications or alterations that do not depart from the spirit and scope of the present invention should be included in the scope of the appended patent application.

10: The first drive circuit

20: The second drive circuit

C: Capacitance

C1: The first cutting point

C2: second cutting point

D1, D2, O1, O2, O3, O4: first end

DI1: The first light-emitting unit

DI2: The second light-emitting unit

DC_L: DC low voltage line

DC_H: DC high voltage line

G1, G2: control terminal

N1: the first node

R1: first resistance

R2: second resistor

S1, S2, W1, W2, W3, W4: second end

T: Transistor

T1: The first transistor

T2: second transistor

Claims (9)

A light-emitting module includes: a first driving circuit having a first node and emitting a first driving signal through the first node; a first light-emitting unit having a first end and a second end, The first terminal of the first light-emitting unit is connected to the first node in a first mode, and emits light according to the first driving signal in the first mode; a second driving circuit is connected to the first node and Emit a second driving signal; and a second light-emitting unit having the first end and the second end, the first end of the second light-emitting unit is connected to the second driving circuit, and in a second mode according to The first driving signal and the second driving signal emit light; wherein, in the first mode, the first driving circuit is activated and the second driving circuit is turned off, and the first light-emitting unit emits light; and in the second mode, the The first driving circuit and the second driving circuit are activated, and the second light-emitting unit emits light. The light-emitting module according to claim 1, wherein the second end of the first light-emitting unit and the second end of the second light-emitting unit are connected to each other. The light-emitting module according to claim 1, further comprising a common signal line and a high voltage line, the common signal line is connected to the first driving circuit and the second driving circuit, and the high voltage line is connected to the second driving circuit . The light-emitting module according to claim 1, wherein a first cutting point is formed between the first node and the first light-emitting unit, and the second driving circuit has a plurality of second cutting points. The light-emitting module according to claim 1, wherein the second driving circuit includes a first transistor, a second transistor, a first resistor, and a second resistor, the first transistor The first end of the first transistor is connected to the first node, the second end of the first transistor is connected to the second light-emitting unit, the first end of the second transistor is connected to the control end of the first transistor, and the second transistor The control end of the second resistor is connected to the first end of the first resistor, the second end of the second transistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the second end of the first resistor . The light emitting module according to claim 5, wherein the resistance value of the first resistor is greater than the resistance value of the second resistor. The light-emitting module according to claim 5, further comprising a DC low-voltage line and a DC high-voltage line, the DC low-voltage line is connected to the second end of the first resistor and the second resistor, and the DC high-voltage line Connect the first transistor and the second transistor. A method for repairing a light-emitting module includes: providing a first driving circuit and a first light-emitting unit connected to the first driving circuit; a first node is provided between the first driving circuit and the first light-emitting unit; There is a first cutting point between the first node and the first light-emitting unit, the first driving circuit emits a first driving signal in a first mode, and the first light-emitting unit is in a first mode according to the A driving signal to emit light; detecting the first light-emitting unit, if the first light-emitting unit fails, provide a second driving circuit and a second light-emitting unit connected to the second driving circuit, the second driving circuit is connected to the first The node has a plurality of second cutting points; cutting the first cutting point and the plurality of second cutting points, the first driving circuit and the first light-emitting unit are disconnected, and the second driving circuit and the second light-emitting unit are turned on And the second driving circuit sends a second driving signal to the second light-emitting unit, and the second light-emitting unit emits light according to the first driving signal and the second driving signal in a second mode. The method for repairing a light-emitting module according to claim 8, wherein the second driving circuit includes a first transistor, a second transistor, a first resistor, and a second resistor. The first end is connected to the first node, the second end of the first transistor is connected to the second light-emitting unit, the first end of the second transistor is connected to the control end of the first transistor, and the second end of the second transistor is connected to the control end of the first transistor. The control terminal is connected to the first terminal of the first resistor, the second terminal of the second transistor is connected to the first terminal of the second resistor, and the second terminal of the second resistor is connected to the second terminal of the first resistor.

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