CN221352363U - Backlight circuit, screen module and electronic equipment - Google Patents

Abstract

The present disclosure provides a backlight circuit, a screen module and an electronic device, the backlight circuit includes: a total positive electrode, a plurality of negative electrodes, a plurality of light emitting branches and a switch assembly; one end of each of the plurality of light-emitting branches is connected with the total positive electrode, and the other ends of the plurality of light-emitting branches are respectively connected with the plurality of negative electrodes in a one-to-one correspondence manner; the switch component is connected with the light-emitting branches and used for controlling the on-off of each light-emitting branch and the on-off of each light-emitting branch; when the total positive electrode and any negative electrode are in short circuit, the switch component controls the short-circuited negative electrode to be disconnected with the connected light-emitting branch and controls the short-circuited light-emitting branch to be communicated with the other light-emitting branch so as to enable the short-circuited light-emitting branch to be connected with the other negative electrode. The backlight circuit can simply, conveniently and efficiently repair the backlight circuit explosion lamp caused by short circuit, realize automatic healing after the short circuit explosion lamp, improve the module yield in production, save the yield loss caused by welding short circuit, and also can directly repair uneven display caused by the short circuit of the backlight circuit.

Description

Backlight circuit, screen module and electronic equipment

Technical Field

The disclosure relates to the field of display screens, and in particular relates to a backlight circuit, a screen module and electronic equipment.

Background

At present, the backlight circuit is mainly composed of a plurality of groups of light emitting diodes which are independently acted, the pin connection tin is easy to generate in the production welding process, or one group or a plurality of groups of diodes are short-circuited due to collision, the time for repairing the short-circuited or replacing the backlight circuit is long, and the cost is high.

Disclosure of utility model

The utility model provides a can simple and efficient automatic repair backlight circuit, screen module and electronic equipment of short circuit condition when backlight circuit short circuit explodes the lamp.

The present embodiment provides a backlight circuit, including: a total positive electrode, a plurality of negative electrodes, a plurality of light emitting branches and a switch assembly; one end of each of the plurality of light emitting branches is connected with the total positive electrode, and the other end of each of the plurality of light emitting branches is connected with the plurality of negative electrodes in a one-to-one correspondence manner; the switch component is connected with the plurality of light-emitting branches and used for controlling the on-off of each light-emitting branch and the on-off of each light-emitting branch;

When the total positive electrode and any negative electrode are in short circuit, the switch component controls the short-circuited negative electrode to be disconnected with the connected light-emitting branch and controls the short-circuited light-emitting branch to be communicated with the other light-emitting branch so as to enable the short-circuited light-emitting branch to be connected with the other negative electrode.

Optionally, the switch assembly includes: the first switches are connected between each light emitting branch and the corresponding negative electrode;

a plurality of second switches connected between the two light emitting branches;

When the total positive electrode and any negative electrode are in short circuit, a first switch arranged between the short-circuited negative electrode and the corresponding light-emitting branch is disconnected; the second switch arranged between the short-circuited light-emitting branch and the other light-emitting branch is closed so that the short-circuited light-emitting branch is communicated with the other light-emitting branch.

Optionally, the number of the second switches is one less than the number of the light emitting branches, and one second switch is connected between two adjacent light emitting branches.

Optionally, the switch assembly further includes:

The controller is electrically connected with each first switch and each second switch and is used for controlling the first switches and the second switches to be closed or opened;

When the total positive electrode and any negative electrode are in short circuit, the controller controls a first switch arranged between the short-circuited negative electrode and the corresponding light-emitting branch to be opened, and controls a second switch arranged between the short-circuited light-emitting branch and the other light-emitting branch to be closed.

Optionally, the backlight circuit further comprises a monitoring component electrically connected with the switch component; the monitoring component is used for monitoring whether short circuit occurs between the total positive electrode and each negative electrode and sending an electric signal to the switch component.

Optionally, the monitoring component includes a plurality of first ampere meters, and each of the light emitting branches is provided with one first ampere meter; each first circuit meter is electrically connected with the switch assembly;

And when the reading of the first ammeter is 0, a first electric signal is sent to the switch assembly, and the switch assembly determines the negative electrode which is short-circuited with the total positive electrode according to the first electric signal.

Optionally, the monitoring assembly further includes a second ammeter disposed between the total anode and each of the light emitting branches; the second ammeter is electrically connected with the switch assembly;

and when the reading of the second ammeter is 0, sending a second electric signal to the switch assembly, and controlling all the light emitting branches to be disconnected from the corresponding cathodes by the switch assembly according to the second electric signal.

Optionally, the light emitting branch comprises a plurality of light emitting diodes connected in series in sequence, the light emitting diode at one end is connected with the total positive electrode, and the light emitting diode at the other end is connected with the corresponding negative electrode.

Optionally, the LED lamp further comprises a plurality of third switches, wherein one third switch is respectively connected between the total anode and each luminous branch; the third switch is used for being opened before the backlight circuit is assembled on the main circuit of the electronic equipment, and is closed after the backlight circuit is assembled on the main circuit of the electronic equipment.

There is provided a screen module comprising a screen assembly and a backlight module stacked and connected to the screen assembly, wherein the backlight module is provided with a backlight circuit as claimed in any one of the above claims.

Optionally, the screen assembly includes a main circuit board, the backlight module includes a backlight circuit board, the backlight circuit is disposed on the backlight circuit board, and the backlight circuit board is connected with the main circuit board.

Optionally, the screen assembly further includes a thin film transistor and a color filter stacked and connected to one side of the thin film transistor, and the backlight module is stacked and connected to the other side of the thin film transistor; the main circuit board is connected with the thin film transistor.

Optionally, the backlight module further comprises a light emitting lamp set and a light guide plate connected with the light emitting lamp set, and the light emitting lamp set is connected with the backlight circuit board. ( The instruction book: the light-emitting lamp group is composed of light-emitting diodes arranged on each light-emitting branch, alternatively, the light-emitting diodes can be LEDs )

The application provides electronic equipment, which comprises an equipment main body and the screen module, wherein the screen module is arranged on the equipment main body.

In some embodiments, the backlight circuit includes: a total positive electrode, a plurality of negative electrodes, a plurality of light emitting branches and a switch assembly; one end of each of the plurality of light-emitting branches is connected with the total positive electrode, and the other ends of the plurality of light-emitting branches are respectively connected with the plurality of negative electrodes in a one-to-one correspondence manner; the switch component is connected with the light-emitting branches and used for controlling the on-off of each light-emitting branch and the on-off of each light-emitting branch; when the total positive electrode and any negative electrode are in short circuit, the switch component controls the short-circuited negative electrode to be disconnected with the connected light-emitting branch and controls the short-circuited light-emitting branch to be communicated with the other light-emitting branch so as to enable the short-circuited light-emitting branch to be connected with the other negative electrode. The backlight circuit can simply, conveniently and efficiently repair the backlight circuit explosion lamp caused by short circuit, realize automatic healing after the short circuit explosion lamp, improve the module yield in production, save the yield loss caused by welding short circuit, and also can directly repair uneven display caused by the short circuit of the backlight circuit.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a top view showing a defective structure of tin dross in a backlight circuit according to the related art.

Fig. 2 is a functional block diagram of one embodiment of the present disclosure.

Fig. 3 is a circuit diagram illustrating one embodiment of the present disclosure.

Fig. 4 and 5 are schematic cross-sectional views illustrating a screen module according to an embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

The common screen explosion lamp is that one group of lamps is short-circuited to cause the group of lamps to be totally unlit, and then the bottom end presents a display effect with alternate brightness. In the actual production process of the project, the backlight circuit and the main FPC are welded together, so that the circuit where the light-emitting component is positioned is switched on, and the on and off of the lamp are controlled by the main board controller. However, in the welding process, there is a risk of explosion, namely, the pins are connected with tin, and because the current module factories mainly adopt pressure welding, the welding process can lead to communication between different pins, and when the anode and the cathode are communicated, short circuit occurs.

As shown in fig. 1, in the related art, a backlight circuit has a total positive electrode 11 and a plurality of negative electrodes 12, and the backlight circuit is disposed between the positive electrode and the plurality of negative electrodes 12. In the case of the pressure welding process, the pressure maintaining bar 8 presses, so that the solder paste connected with the backlight circuit diffuses to two sides, the solder slag 9 is poor, and when the positive electrode 12 and the negative electrode 12 are connected due to the diffusion of the solder slag 9, a short circuit occurs. In another case, the short circuit may be generated by press welding during the production process, and the circuit is detected before leaving the factory, and if the short circuit is detected, the circuit is repaired or replaced; the short circuit may also occur after assembly, and the backlight circuit before assembly may have a poor condition of the tin dross 9, but the tin dross 9 has not diffused into the other positive electrode or negative electrode 12, and no short circuit condition occurs, so that no short circuit condition is detected in the process of factory inspection. The tin dross 9 may be continuously diffused due to the collision or large movement of the circuit after the circuit is assembled into the device, and then a short circuit phenomenon is generated, and the short circuit needs to take a lot of time and cost to disassemble and replace.

Based on the above-mentioned problems, the embodiments of the present disclosure provide a backlight circuit, a screen module and an electronic device, where the backlight circuit can implement self-healing of a short circuit in both processes. The backlight circuit of the present embodiment includes: a total positive electrode, a plurality of negative electrodes, a plurality of light emitting branches and a switch assembly. One end of each of the plurality of light-emitting branches is connected with the total positive electrode, and the other ends of the plurality of light-emitting branches are respectively connected with the plurality of negative electrodes in a one-to-one correspondence manner; the switch assembly is connected with the light-emitting branches and used for controlling the on-off of each light-emitting branch and the on-off of each light-emitting branch. When the total positive electrode and any negative electrode are in short circuit, the switch component controls the short-circuited negative electrode to be disconnected with the connected light-emitting branch and controls the short-circuited light-emitting branch to be communicated with the other light-emitting branch so as to enable the short-circuited light-emitting branch to be connected with the other negative electrode. The backlight circuit can simply, conveniently and efficiently repair the backlight circuit explosion lamp caused by short circuit, realize automatic healing after the short circuit explosion lamp, improve the module yield in production, save the yield loss caused by welding short circuit, and also can directly repair uneven display caused by the short circuit of the backlight circuit.

The backlight circuit and the electronic device of the present disclosure are described in detail below with reference to the accompanying drawings. The features of the examples and embodiments described below may be combined with each other without conflict.

As shown in fig. 2, in some embodiments, the backlight circuit 1 includes: a total positive electrode 11, a plurality of negative electrodes 12, a plurality of light emitting branches 13, and a switch assembly 14; one ends of the light-emitting branches 13 are connected with the total anode 11, and the other ends of the light-emitting branches 13 are respectively connected with the cathodes 12 in a one-to-one correspondence. The backlight circuit 1 has only one total positive electrode 11 because of the common anode design. In the backlight circuit 1 having only one total positive electrode 11, the negative electrodes 12 of all the light emitting elements are independent, and their positive electrodes are connected together through a common connection point. This design makes control of the switch and brightness adjustment more convenient. The brightness of the entire backlight is controlled by applying a voltage across the cathodes 12 of the individual LED elements to illuminate them while adjusting the voltage of the total anode 11. The overall positive 11 design requires the use of devices such as NPN transistors or MOSFETs in the drive circuit to control the voltage at the negative electrode 12 of each light emitting element. In addition, when the common anode backlight circuit 1 is used, an appropriate current limiting circuit is also required to ensure that the current of the light emitting element of each light emitting branch 13 is within a safe range.

The switch assembly 14 is connected to the plurality of light emitting branches 13, and is used to control the on-off of each light emitting branch 13 and the on-off between each light emitting branch 13, the switch assembly 14 is mainly used to control the on-off of the current of each light emitting branch 13 in the backlight circuit 1, and the CMOS switch, the electric control switch, and the like can be used in the integrated circuit to realize the on-off function of the current. When the total positive electrode 11 and any negative electrode 12 are short-circuited, the switch assembly 14 controls the short-circuited negative electrode 12 to be disconnected from the connected light-emitting branch 13, and controls the short-circuited light-emitting branch 13 to be communicated with the other light-emitting branch 13 so as to connect the short-circuited light-emitting branch 13 with the other negative electrode 12. After the short circuit, because the positive and negative poles of the short-circuited light-emitting branch 13 are directly connected, the electric potential at the two ends of the light-emitting branch 13 is the same, no current passes through the light-emitting branch 13, the switch for controlling the light-emitting branch 13 is turned off to prevent the damage of elements caused by the short circuit, and the connection between one end of the light-emitting branch 13 and the negative pole 12 can be cut off, so that the two ends of the light-emitting branch 13 are not influenced by the positive and negative poles of the short circuit, the switch component 14 is used for controlling the light-emitting branch 13 to be connected with the negative poles 12 of other light-emitting branches 13 which are not short-circuited, and the originally short-circuited light-emitting branch 13 can normally emit light through the current. At this time, the shorted light emitting branch 13 and the other light emitting branch 13 share the positive and negative electrodes, and the shorted light emitting branch 13 may be regarded as being connected in parallel with the other light emitting branch 13. Therefore, the backlight circuit explosion lamp caused by short circuit is simply, conveniently and efficiently repaired, automatic healing after the short circuit explosion lamp is realized, the module yield in production is improved, the yield loss caused by welding short circuit is saved, and uneven display caused by the short circuit of the backlight circuit can be directly repaired. It should be noted that, the backlight circuit of the embodiment is applicable to all the phenomena of explosion caused by short circuit, is not limited to the defects of tin connection under pin, and has wide application scenarios.

In some embodiments, the light emitting branch 13 comprises a plurality of light emitting diodes connected in series in sequence, the light emitting diode at one end is connected with the total positive electrode 11, and the light emitting diode at the other end is connected with the corresponding negative electrode 12. The light emitting diodes are connected in series to form a light emitting branch 13, and in the backlight circuit 1, the light emitting elements can also be a Liquid Crystal Display (LCD) backlight source and an Organic Light Emitting Diode (OLED) backlight source. Liquid Crystal Display (LCD) backlight: an LCD backlight is an element that illuminates a liquid crystal screen by providing backlight. It typically employs a Cold Cathode Fluorescent Lamp (CCFL) or LED as a backlight. The LED backlight has the advantages of high efficiency, energy saving, long service life, better color performance and the like. Organic Light Emitting Diodes (OLEDs) may also be used as backlights: an OLED is a light emitting diode that emits light using an organic material. OLED backlights are suitable for flexible displays and high contrast applications. It can directly emit light on the screen without a backlight plate, and has higher flexibility and better color reproduction capability.

In some embodiments, as shown in fig. 3, the switch assembly 14 includes: the multiple first switches 141 are respectively connected between each light-emitting branch 13 and the corresponding negative electrode 12, one first switch 141 is connected between each light-emitting branch 13 and the corresponding negative electrode 12, the first switch 141 can control the on-off of the light-emitting branch 13, when the first switch 141 is closed, the light-emitting branch 13 is connected with the positive electrode 12 to form a passage, and the light-emitting branch 13 can normally work to provide a light source for equipment. When the light-emitting branch 13 where the first switch 141 is located is short-circuited, the first switch 141 is turned off to prevent damage to elements caused by the short-circuit, and the connection between one end of the light-emitting branch 13 and the negative electrode 12 is cut off, so that both ends of the light-emitting branch 13 are not affected by the shorted positive and negative electrode potential.

A plurality of second switches 142, wherein the second switches 142 are connected between the two light emitting branches 13, and when the total positive electrode 11 and any of the negative electrodes 12 are short-circuited, the first switches 141 provided between the short-circuited negative electrode 12 and the corresponding light emitting branch 13 are turned off; the second switch 142 disposed between the shorted light emitting branch 13 and the other light emitting branch 13 is closed to communicate the shorted light emitting branch 13 with the other light emitting branch 13. Specifically, the second switch 142 has one end connected between the light emitting branch 13 and the first switch 141 connected to the light emitting branch 13, and the other end connected between the other light emitting branch 13 and the first switch 141 connected thereto. If any one of the two light emitting branches 13 connected to the second switch 142 is shorted, the shorted light emitting branch 13 can be connected to the other negative electrode 12 by opening the second switch 142, so that the positive electrode and the negative electrode 12 connected to the two ends of the shorted light emitting branch 13 regain potential difference, current can flow through the shorted light emitting branch 13, and the shorted condition can be repaired.

In some embodiments, the number of second switches 142 is the same as the number of light emitting branches 13, and one second switch 142 is connected between two light emitting branches 13. The second switch 142 may be connected in the following manner: the light emitting branches 13 are combined two by two, and the second switch 142 is connected between the two-by-two combined lines. For example, two branches are selected from three branches 13A, 13B and 13C to be combined, 3 combination modes of 13A, 13B, 13A, 13C can be obtained, and a second switch 142 is arranged among the branches 13A, 13B, 13A, 13C and 13B, so that when the light-emitting branch 13 of 13A is short-circuited, the second switch 142 between the branches 13A, 13B can be selectively opened, and the branches 13A and 13B are connected in parallel; alternatively, the second switch 142 between 13A and 13C may be opened so that the branches 13A and 13C are connected in parallel, which is relatively straightforward.

Or the number of the second switches 142 may be one less than the number of the light emitting branches 13, and one second switch 142 is connected between two adjacent light emitting branches 13, which means that the second switches 142 are connected between two adjacent light emitting branches 13 one by one, and two adjacent light emitting branches 13 share one second switch 142. For example, referring to fig. 3, 13A, 13B, 13C are three light emitting branches 13 arranged in sequence, two adjacent light emitting branches 13 thereof are combined into 13A13B, 13B13C and a second switch 142 is connected between the branches 13A13B, 13B13C, that is, the second switch 142A is connected between the two branches 13A, 13B, and the second switch 142B is connected between the two branches 13B, 13C. Thus, a second switch can be saved, the connection method of the second switch 142 is simpler, the circuit arrangement is simple, and the circuit redundancy can be reduced.

As shown in fig. 3, 3 light emitting branches are taken as an example. During normal operation, the second switch 142A and the second switch 142B are in an open state, and the first switch 141A, the first switch 141B, and the first switch 141C are in a closed state, and during this time, the light emitting branch 13A, the light emitting branch 13B, and the light emitting branch 13C all operate normally.

When the total positive electrode 11 and the negative electrode 12A are short-circuited, the light emitting branch 13A is short-circuited, and the light emitting diode of the light emitting branch 13A is not lit. The light emitting branch 13B and the light emitting branch 13C are not affected, and their respective light emitting diodes normally emit light. At this time, the short-circuit self-repairing mechanism is started, the switch assembly 14 turns off the first switch 141A, the first switch 141B and the first switch 141C are still in a closed state, the second switch 142A is still in an open state, and at this time, the light-emitting branch 13A and the light-emitting branch 13B share the power supply between the total positive electrode 11 and the negative electrode 12B, so that the respective light-emitting diodes of the light-emitting branch 13A and the light-emitting branch 13B can normally emit light, and the light-emitting branch 13C is powered by the separate power supply between the total positive electrode 11 and the negative electrode 12C and can normally emit light.

Similarly, when the total positive electrode 11 and the negative electrode 12B are shorted, the first switch 141B is opened, the second switch 142A is closed, or the second switch 142B is closed, so that the light-emitting branch 13B and the light-emitting branch 13C are connected in parallel, or the light-emitting branch 13B and the light-emitting branch 13A are connected in parallel, and self-repairing is realized, which is the case that the probability of occurrence is very low, mainly because the total positive electrode 11 and the negative electrode 12B are far away.

Similarly, when the total positive electrode 11 and the negative electrode 12C are short-circuited, the light-emitting branch 13C and the light-emitting branch 13B are connected in parallel by opening the first switch 141C and closing the second switch 142B.

In the worst case, when the total positive electrode 11 is shorted with the negative electrode 12A and the negative electrode 12B, the first switch 141A and the first switch 141B are opened, the first switch 141C is still in the closed state, and the second switch 142A and the second switch 142B are closed, so that the light emitting branch 13A, the light emitting branch 13B and the light emitting branch 13C are simultaneously connected in parallel, the power supply between the total positive electrode 11 and the negative electrode 12C is shared, and the light emitting branch 13A, the light emitting branch 13B and the light emitting branch 13C emit light simultaneously.

It should be noted here that, when only the negative electrode 12A and the negative electrode 12B are shorted, normal light emission of the light emitting branch 13A and the light emitting branch 13B is not affected, because the total positive electrode 11 and the negative electrode 12A, and the total positive electrode 11 and the negative electrode 12B are connected in parallel, and then output to the parallel circuit of the light emitting branch 13A and the light emitting branch 13B.

As shown in table 1 below, the logic summarizing the response mechanism for controlling the short circuit repair in each case of short circuit is shown in table 1:

TABLE 1

In some embodiments, the switch assembly 14 further comprises:

A controller electrically connected to each of the first switches 141 and each of the second switches 142, for controlling the on/off of each of the first switches 141 and each of the second switches 142; because the integrated circuit is often applied to electronic equipment, manual switch removal is difficult to realize and not convenient enough, and the switch assembly 14 comprises a controller which can realize the on and off of an automatic control switch, and the on and off of the circuit is controlled through the switch.

When the total positive electrode 11 and any of the negative electrodes 12 are shorted, the controller controls the first switch 141 disposed between the shorted negative electrode 12 and the corresponding light emitting branch 13 to be opened, and controls the second switch 142 disposed between the shorted light emitting branch 13 and the other light emitting branch 13 to be closed. The controller controls the on-off of the first switch 141 to determine the on-off of the light emitting branch 13, and when the first switch 141 is closed, the light emitting branch 13 is connected with the anode and the cathode 12 to form a passage, so that the light emitting branch 13 can work normally. When the light-emitting branch 13 where the first switch 141 is located is short-circuited, the first switch 141 is controlled to be turned off, so that damage to elements caused by the short circuit can be prevented, and the connection between one end of the light-emitting branch 13 and the negative electrode 12 can be cut off, so that the two ends of the light-emitting branch 13 are not affected by the positive and negative electrode potentials which are short-circuited. The second switch 142 is controlled to be turned off to connect the shorted light emitting branch 13 with other cathodes 12, so that the cathodes 12 connected with the two ends of the shorted light emitting branch 13 regain potential difference, current flows through the shorted light emitting branch 13, and the shorted condition can be repaired.

In some embodiments, a monitoring assembly is also included, electrically connected to the switch assembly 14; the monitoring assembly is used for monitoring whether a short circuit occurs between the total positive electrode 11 and each negative electrode 12, and sending an electrical signal to the switching assembly 14. In the present disclosure, the main purpose of the monitoring assembly is to monitor whether the light emitting branch 13 is shorted, the monitoring assembly may be a thermal imaging detection device, and an external thermal imager is used to detect temperature changes in the circuit. Short circuits often lead to abnormal heat generation, hot spots being observed by the thermal imager. Or may be a resistance measuring device or other suitable test instrument that measures the resistance of various portions of the circuit. If there is a short circuit in the circuit, the resistance value will show a very low value, close to zero.

In some embodiments, the monitoring assembly includes a plurality of first ammeters 145, and one first ammeters 145 is disposed on each of the light emitting branches 13; are electrically connected to the switch assembly 14; the ammeter is a simple and efficient monitoring component for monitoring whether the light-emitting branch 13 is short-circuited, when the ammeter number is 0, the branch can be regarded as short-circuited, the ammeter is electrically connected with a controller in the switch component 14, when the first ammeter 145 number is 0, a first electric signal is sent to the switch component 14, and the switch component 14 determines the negative electrode 12 short-circuited with the total positive electrode 11 according to the first electric signal. After determining the short-circuited cathode 12, the controller controls the first switch 141 connected to the cathode 12 to be turned off, thereby preventing damage to other elements caused by the short circuit, and also may cut off the connection between one end of the light emitting branch 13 and the cathode 12, so that both ends of the light emitting branch 13 are not affected by the shorted positive and negative electrode potential. The second switch 142 is turned on again to connect the shorted light emitting branch 13 to the other negative electrode 12, so that the positive electrode 12 and the negative electrode 12 connected to the two ends of the shorted light emitting branch 13 regain the potential difference, and the current flows through the shorted light emitting branch 13, so that the shorted condition can be repaired.

In some embodiments, the monitoring assembly further comprises a second ammeter 146 disposed between the total positive electrode 11 and each of the light emitting branches 13; the second ammeter 146 is electrically connected to the switch assembly 14. The second ammeter 146 can monitor the current change passing through the total positive electrode 11, and plays a role in assisting in judging the condition of the backlight circuit 1. When the indication number of the first ammeter 145 is 0 and the indication number of the second ammeter 146 is not 0, it is indicated that the total positive electrode 11 has current passing therethrough, but the light emitting branch 13 where the first ammeter 145 with the indication number of 0 is located has no current passing therethrough, so that it can be determined that the light emitting branch 13 is shorted but the backlight circuit 1 can still operate. When the reading of the second ammeter 146 is 0, a second electrical signal is sent to the switch assembly 14, and the switch assembly 14 controls all the light emitting branches 13 to be disconnected from the corresponding cathodes 12 according to the second electrical signal. When the second ammeter 146 indicates that the number is 0, no current passes through the total positive electrode 11, no current passes through each light emitting branch 13, and the backlight circuit 1 cannot provide a backlight source. At this time, it may be that the welding of the backlight circuit 1 and the main circuit is problematic, or that the entire circuit of the backlight circuit 1 is shorted, all the first switches 141 may be turned off, and all the light emitting branches 13 may be turned off to prevent damage to components and occurrence of safety hazards.

As shown in fig. 3, 3 light emitting branches are taken as an example. During normal operation, the second switch 142A and the second switch 142B are in an open state, and the first switch 141A, the first switch 141B, and the first switch 141C are in a closed state, and during this time, the light emitting branch 13A, the light emitting branch 13B, and the light emitting branch 13C all operate normally. The A ammeter, the A1 ammeter, the A2 ammeter and the A3 ammeter are all displayed with indication numbers.

When the total positive electrode 11 and the negative electrode 12A are short-circuited, the a current meter has an indication number, the A3 current meter has an indication number approaching 0 because of the short circuit, the light emitting branch 13A is short-circuited, and the light emitting diode of the light emitting branch 13A is not bright. The light emitting branch 13B and the light emitting branch 13C are not affected, and the A2 ammeter and the A1 ammeter still show numbers again, and the respective light emitting diodes normally emit light. The controller knows through ammeter feedback data that the A3 current represents the number and tends to 0, and A ammeter, A1 ammeter, A2 ammeter are normal, indicate that luminous branch 13A is short circuited, start short circuit self-repairing mechanism this moment, control switch assembly 14 and open first switch 141A, first switch 141B and first switch 141C still are in the closed state, close second switch 142A, second switch 142B still is in the open state, luminous branch 13A and luminous branch 13B at this moment, the power between total positive pole 11 and the negative pole 12B is shared, luminous branch 13A and luminous branch 13B respective luminous diode can all normally give out light like this, luminous branch 13C is the independent power supply between total positive pole 11 and the negative pole 12C and supplies power, can normally give out light equally.

Similarly, when the total positive electrode 11 and the negative electrode 12B are shorted, the first switch 141B is opened, the second switch 142A is closed, or the second switch 142B is closed, so that the light-emitting branch 13B and the light-emitting branch 13C are connected in parallel, or the light-emitting branch 13B and the light-emitting branch 13A are connected in parallel, and self-repairing is realized, which is the case that the probability of occurrence is very low, mainly because the total positive electrode 11 and the negative electrode 12B are far away.

Similarly, when the total positive electrode 11 and the negative electrode 12C are short-circuited, the light-emitting branch 13C and the light-emitting branch 13B are connected in parallel by opening the first switch 141C and closing the second switch 142B.

In the worst case, when the total positive electrode 11 is shorted with the negative electrode 12A and the negative electrode 12B, the first switch 141A and the first switch 141B are opened, the first switch 141C is still in the closed state, and the second switch 142A and the second switch 142B are closed, so that the light emitting branch 13A, the light emitting branch 13B and the light emitting branch 13C are simultaneously connected in parallel, the power supply between the total positive electrode 11 and the negative electrode 12C is shared, and the light emitting branch 13A, the light emitting branch 13B and the light emitting branch 13C emit light simultaneously.

It should be noted here that, when only the negative electrode 12A and the negative electrode 12B are shorted, normal light emission of the light emitting branch 13A and the light emitting branch 13B is not affected, because the total positive electrode 11 and the negative electrode 12A, and the total positive electrode 11 and the negative electrode 12B are connected in parallel, and then output to the parallel circuit of the light emitting branch 13A and the light emitting branch 13B.

As shown in table 2 below, the logic summarizing the response mechanism for controlling the short circuit repair in each case of short circuit is shown in table 2 below:

TABLE 2

In some embodiments, the backlight circuit 1 further includes a plurality of third switches 143, and one third switch 143 is connected between the total positive electrode 11 and each light emitting branch 13. The third switch 143 is opened before the backlight circuit 1 is mounted on the main line of the electronic device, and is closed after the backlight circuit 1 is mounted on the main line of the electronic device. The third switch 143 is mainly located at a welding position between the backlight circuit 1 and the main circuit, the backlight circuit 1 needs to be connected with the main circuit to provide a backlight source for the device, and improper welding between the two often causes a circuit short circuit problem, so that a welding switch is arranged at the welding position, when the two are welded, the backlight circuit 1 is in a closed state, and the backlight circuit 1 is communicated with the main circuit for power supply. In some embodiments, the switch assembly 14 receives the third electrical signal generated after the third switch 143 is closed and controls the first switch 141 to be opened, so that the current passes through the light emitting branch 13, and the backlight circuit 1 operates normally. It will be appreciated that the third switch 143 is opened before the backlight 1 is mounted on the main circuit (FPC board) of the screen module, and is closed after the backlight 1 is mounted on the main circuit of the screen module. The third switch 143 is mainly located at a welding position between the backlight circuit 1 and the main circuit, the backlight circuit 1 needs to be connected with the main circuit to provide a backlight source for the device, and improper welding between the two often causes a circuit short circuit problem, so that a welding switch is arranged at the welding position, when the two are welded, the backlight circuit 1 is in a closed state, and the backlight circuit 1 is communicated with the main circuit for power supply.

The present embodiment provides a screen module, including a screen assembly 110 and a backlight module 130 stacked and connected with the screen assembly 110, where the backlight module 130 is provided with the backlight circuit 1 as described in any one of the above. As shown in fig. 4 and 5, the backlight module 130 includes the backlight circuit board 123 and the light emitting lamp group 124 as described above, and the light emitting lamp group 124 is composed of light emitting diodes disposed in each light emitting branch, alternatively, the light emitting diodes may be LEDs, and the backlight circuit board 123 is provided with other backlight circuit 1 elements except the light emitting lamp group 124. The backlight module further comprises a reflective sheet 120, a light guide plate 119, a diffusion sheet, an upper light enhancement film 117 and a lower light enhancement film 117 stacked together, and a light shielding adhesive 122 is disposed above the backlight circuit board 123. The light emitting lamp set 124 is a core component of the backlight module, and is a real source of the backlight light source, and the stacked structure enables the light emitted by the light emitting lamp set to vertically emit after passing through the light guide plate 119, the diffusion sheet, the upper and lower light enhancement films 117 in sequence. The shading adhesive 122 plays a role in controlling the light propagation path of the light source, so that all light rays of the light source can pass through the light guide plate 119, the reflecting sheet 120 can also play a role in controlling the light propagation path, so that the light rays are ensured to be emitted perpendicular to the reflecting sheet, and optionally, the reflecting sheet 120 can be arranged on one side of the equipment iron frame 121.

In some embodiments, the screen assembly includes a main circuit board 126, the backlight module 130 includes a backlight circuit board 123, the backlight circuit 1 is disposed on the backlight circuit board 123, and the backlight circuit board 123 is connected to the main circuit board 126. In some embodiments, the backlight module further includes a light emitting lamp set 124 and a light guide plate 119 connected to the light emitting lamp set 124, and the light emitting lamp set 124 is connected to the backlight circuit board 123. The backlight circuit 1 needs to be powered on with the main circuit to provide a light source, the backlight circuit 1 is arranged on the backlight circuit board 123, the main circuit is arranged on the main circuit board 126, the two circuits need to be connected to play a role of providing the light source by the backlight circuit 1, and after the backlight circuit board 123 is connected with the main circuit board 126, the light-emitting lamp set 124 emits light to provide the light source, and the light is emitted vertically after passing through the backlight module.

In some embodiments, the screen assembly 110 further includes a thin film transistor 115 and a color filter 114 stacked and connected to one side of the thin film transistor 115, and the backlight module is stacked and connected to the other side of the thin film transistor 115; the main circuit board 126 is connected to the thin film transistor 115. Thus, light emitted vertically from the backlight module passes through the stacked thin film transistor 115 and the color filter 114. The thin film transistor 115 is used to control the switching of each pixel in the display screen of the device, and is an active element that needs to be connected to the main circuit board 126. The thin film transistor 115 is mainly used in a display system and a panel driving circuit. The thin film transistor 115 changes a conductive state between the source and the drain by controlling the gate signal, thereby controlling brightness and color of the pixel point in the display screen of the device. The color filters 114 provide three primary colors so that the device display screen displays a color image.

In some embodiments, the screen assembly 110 further includes an upper polarizer 113, a lower polarizer 116. The upper polarizer 113 and the lower polarizer 116 are mainly used for controlling the propagation direction of light so as to realize a liquid crystal display effect. Specifically, the liquid crystal molecules have a fixed alignment direction when not subjected to an external electric field. When normal light passes through the screen, the electric field vector of the light is perpendicular to the long axes of the liquid crystal molecules, and the polarization direction of the light is not coincident with the alignment direction of the liquid crystal molecules. Therefore, when normal light passes through the upper and lower polarizers 116 on the liquid crystal screen, only light of a specific polarization direction matching the alignment direction of the liquid crystal molecules can pass. The liquid crystal screen works on the principle that the transmission degree of light is controlled by adjusting the arrangement direction of liquid crystal molecules. When the liquid crystal screen receives the electric field signal, the liquid crystal molecules rotate or adjust the arrangement direction of the liquid crystal molecules, so that the polarization direction of light passing through the liquid crystal screen is changed. Thus, the brightness and the color of the liquid crystal screen can be adjusted, and the display of the image is realized. In some embodiments, the upper polarizer 113 is connected to the cover 111 by an adhesive of the cover 111. The cover plate 111 is the outermost layer of the mobile phone screen, and plays a role in protecting the mobile phone screen. It may be made of toughened glass, the surface of which is specially treated to enhance its hardness, wear resistance and impact resistance. In some embodiments, the screen module further includes a chip 125, where the chip 125 is responsible for receiving the input signal and converting it into data that can be displayed on the display screen, controlling parameters such as display mode, color, brightness, etc. of the display screen, and processing other tasks related to the display screen.

The embodiment provides an electronic device, which comprises a device main body and the screen module. The electronic equipment of the embodiment can automatically repair the short-circuited circuit under the condition of short-circuited explosion. The electronic device of the embodiment may be an electronic product including a mobile phone, a tablet computer, a notebook computer, a wearable device, a smart watch, a smart bracelet, and the like. The electronic equipment adopting the backlight circuit 1 has the following beneficial effects:

1. The product quality is improved, and the defect of explosion caused by sudden short circuit in the use process of a user is avoided;

2. The yield of the module is improved, yield loss caused by welding short circuit is saved, cost loss caused by repair and scrapping is avoided to a certain extent, and cost is saved;

3. The display unevenness caused by poor after-sales explosion lamps is reduced, and the brand image and quality public praise can be established. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (14)

1. A backlight circuit, comprising:

A total positive electrode, a plurality of negative electrodes, a plurality of light emitting branches and a switch assembly; one end of each of the plurality of light emitting branches is connected with the total positive electrode, and the other end of each of the plurality of light emitting branches is connected with the plurality of negative electrodes in a one-to-one correspondence manner; the switch component is connected with the plurality of light-emitting branches and used for controlling the on-off of each light-emitting branch and the on-off of each light-emitting branch;

When the total positive electrode and any negative electrode are in short circuit, the switch component controls the short-circuited negative electrode to be disconnected with the connected light-emitting branch and controls the short-circuited light-emitting branch to be communicated with the other light-emitting branch so as to enable the short-circuited light-emitting branch to be connected with the other negative electrode.

2. The backlight circuit of claim 1, wherein the switch assembly comprises:

The first switches are connected between each light emitting branch and the corresponding negative electrode;

a plurality of second switches connected between the two light emitting branches;

When the total positive electrode and any negative electrode are in short circuit, a first switch arranged between the short-circuited negative electrode and the corresponding light-emitting branch is disconnected; the second switch arranged between the short-circuited light-emitting branch and the other light-emitting branch is closed so that the short-circuited light-emitting branch is communicated with the other light-emitting branch.

3. The backlight circuit of claim 2, wherein the number of the second switches is one less than the number of the light emitting branches, and one second switch is connected between two adjacent light emitting branches.

4. The backlight circuit of claim 2, wherein the switch assembly further comprises:

The controller is electrically connected with each first switch and each second switch and is used for controlling the first switches and the second switches to be closed or opened;

When the total positive electrode and any negative electrode are in short circuit, the controller controls a first switch arranged between the short-circuited negative electrode and the corresponding light-emitting branch to be opened, and controls a second switch arranged between the short-circuited light-emitting branch and the other light-emitting branch to be closed.

5. The backlight circuit of claim 1, further comprising a monitoring assembly electrically connected to the switching assembly; the monitoring component is used for monitoring whether short circuit occurs between the total positive electrode and each negative electrode and sending an electric signal to the switch component.

6. The backlight circuit of claim 5, wherein the monitoring assembly comprises a plurality of first current meters, one first current meter being provided on each of the light emitting branches; each first circuit meter is electrically connected with the switch assembly;

And when the reading of the first ammeter is 0, a first electric signal is sent to the switch assembly, and the switch assembly determines the negative electrode which is short-circuited with the total positive electrode according to the first electric signal.

7. The backlight circuit of claim 6, wherein the monitoring assembly further comprises a second ammeter disposed between the total anode and each of the light emitting branches; the second ammeter is electrically connected with the switch assembly;

and when the reading of the second ammeter is 0, sending a second electric signal to the switch assembly, and controlling all the light emitting branches to be disconnected from the corresponding cathodes by the switch assembly according to the second electric signal.

8. The backlight circuit of claim 1, wherein the light emitting branch comprises a plurality of light emitting diodes connected in series in sequence, the light emitting diode at one end is connected with a total positive electrode, and the light emitting diode at the other end is connected with the corresponding negative electrode.

9. The backlight circuit of claim 1, further comprising a plurality of third switches, one third switch being connected between the total positive electrode and each of the light emitting branches, respectively; the third switch is used for being opened before the backlight circuit is assembled on the main circuit of the electronic equipment, and is closed after the backlight circuit is assembled on the main circuit of the electronic equipment.

10. A screen module comprising a screen assembly and a backlight module in stacked connection with the screen assembly, the backlight module being provided with a backlight circuit as claimed in any one of claims 1 to 9.

11. The screen module of claim 10, wherein the screen assembly comprises a main circuit board, the backlight module comprises a backlight circuit board, the backlight circuit is disposed on the backlight circuit board, and the backlight circuit board is connected with the main circuit board.

12. The screen module of claim 11, wherein the screen assembly further comprises a thin film transistor and a color filter stacked and connected to one side of the thin film transistor, the backlight module stacked and connected to the other side of the thin film transistor; the main circuit board is connected with the thin film transistor.

13. The screen module of claim 11, wherein the backlight module further comprises a light emitting lamp set and a light guide plate connected to the light emitting lamp set, the light emitting lamp set being connected to the backlight circuit board.

14. An electronic device comprising a device body and the screen module according to any one of claims 10 to 13, the screen module being provided to the device body.