Backlight module and display device

Abstract

The invention discloses a backlight module and a display device. The backlight module comprises a light-emitting lamp panel, a light-emitting driver, a controller and a detection circuit. A plurality of light-emitting elements are arranged on the light-emitting lamp panel. The light-emitting driver is electrically connected with the light-emitting elements and used for driving the light-emitting elements to emit light. The controller is electrically connected with the light-emitting driver and the detection circuit and used for determining the risk level of the light-emitting driver according to the test information collected by the detection circuit and sending a control signal to the light-emitting driver according to the risk level so as to control the working state of the light-emitting driver. Therefore, the abnormal condition of the light-emitting driver is detected through the detection circuit, the risk level is judged according to the abnormal condition of the light-emitting driver in combination with the controller, and the control signal corresponding to the risk level is sent to the light-emitting driver, so that the light-emitting driver takes corresponding measures, and the light-emitting driver is prevented from being damaged due to the abnormal condition; and the reliability of the backlight module is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] With the continuous development of liquid crystal display technology, liquid crystal display devices have been widely used in all aspects of life. Liquid crystal display devices include backlight modules and display panels. The backlight module provides light source for the display panel and is an indispensable part of the liquid crystal display device.

[0003] A light driver is usually provided in the backlight module to drive multiple light emitting devices in the backlight module. Various factors may easily cause damage to the light driver during its operation. The means for detecting abnormal conditions in the prior art are relatively simple and the protection effect on the backlight module is poor. Summary of the invention

[0004] The present invention provides a backlight module and a display device to solve the problem that the liquid crystal display device cannot effectively detect the cause of abnormality of the light emitting driver due to the single abnormality detection means, so that the light emitting driver cannot work normally and finally causes the backlight circuit to fail.

[0005] The present invention provides a backlight module, comprising:

[0006] A light-emitting lamp panel, on which a plurality of light-emitting elements are arranged;

[0007] A light-emitting driver, a controller and a detection circuit, wherein the light-emitting driver is electrically connected to the light-emitting elements and is used to drive the multiple light-emitting elements to emit light, and the controller is electrically connected to the light-emitting driver and the detection circuit respectively;

[0008] The controller is used to determine the risk level of the light emitting driver according to the test information collected by the detection circuit, and send a control signal to the light emitting driver according to the risk level to control the working state of the light emitting driver.

[0009] Based on the same inventive concept, the present invention further provides a display device, comprising the backlight module of the present invention.

[0010] Compared with the prior art, the backlight module and display device provided by the present invention achieve at least the following beneficial effects:

[0011] The backlight module provided by the present invention comprises: a light-emitting lamp board, on which a plurality of light-emitting elements are arranged; a light-emitting driver, a controller and a detection circuit, wherein the light-emitting driver is electrically connected to the light-emitting element and is used to drive the plurality of light-emitting elements to emit light, and the controller is electrically connected to the light-emitting driver and the detection circuit respectively; the controller is used to determine the risk level of the light-emitting driver according to the test information collected by the detection circuit, and send a control signal to the light-emitting driver according to the risk level to control the working state of the light-emitting driver. The test information of the light-emitting driver is obtained by setting the detection circuit, and the test information is sent to the controller, the controller processes the test information, determines the risk level of the light-emitting driver, and the processing methods corresponding to different risk levels are different, and then the controller sends the corresponding control signal to the light-emitting driver according to the determined risk level, so that the light-emitting driver takes relevant measures corresponding to the risk level. Thus, on the basis of ensuring the normal operation of the light-emitting driver, the problem that the light-emitting driver cannot be effectively detected due to the single abnormality detection means of the liquid crystal display device, thereby causing the light-emitting driver to fail to work normally, and finally causing the backlight circuit to fail, is solved, and the reliability of the backlight module is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural block diagram of a backlight module provided by an embodiment of the present invention;

[0013] Figure 2 is a functional schematic diagram of a backlight module provided by an embodiment of the present invention;

[0014] Figure 3 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0015] Figure 4 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0016] Figure 5 is a working timing diagram of a light-emitting driver provided by an embodiment of the present invention;

[0017] Figure 6 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0018] Figure 7 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0019] Figure 8 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0020] Fig. 9 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0021] Fig.10 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention;

[0022] Fig.11 is a structural schematic diagram of a sampling circuit provided by an embodiment of the present invention;

[0023] Fig.12 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be fully described below in combination with the drawings in the embodiments of the present invention through specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work fall within the protection scope of the present invention.

[0025] The inventor has discovered through research that in the existing backlight module, abnormal situations are prone to occur in the process of driving the light-emitting elements through the light-emitting driver, such as voltage boost abnormality during the output voltage boost process of the light-emitting driver, or abnormality inside the light-emitting driver, such as overvoltage abnormality, overcurrent abnormality, undervoltage abnormality, etc., or abnormality in the light-emitting elements driven by the light-emitting driver, etc. These abnormal situations will affect the normal operation of the light-emitting driver and may even damage the light-emitting driver, thereby causing the backlight module to fail. The means for detecting abnormal situations in the prior art are relatively single, and it is impossible to adopt corresponding means for different abnormal situations.

[0026] Figure 1 Schematic diagram of the structure of a backlight module provided by an embodiment of the present invention. Figure 1 The backlight module includes a light-emitting lamp panel 10, a light-emitting driver 20, a controller 30 and a detection circuit 40. The light-emitting lamp panel 10 is provided with a plurality of light-emitting elements 110, the light-emitting driver 20 is electrically connected to the light-emitting elements 110, and is used to drive the plurality of light-emitting elements 110 to emit light, and the controller 30 is electrically connected to the light-emitting driver 20 and the detection circuit 40, respectively. The controller 30 is used to determine the risk level of the light-emitting driver 20 according to the test information collected by the detection circuit 40, and send a control signal to the light-emitting driver 20 according to the risk level to control the working state of the light-emitting driver 20.

[0027] Specifically, the light emitting element 110 may be a light emitting diode (LED), and the light emitting driver 20 may be an LED driver. The light emitting driver 20 is electrically connected to a plurality of light emitting elements 110 to drive the plurality of light emitting elements 110 to emit light, thereby providing a backlight source for the display panel. The detection circuit 40 is used to detect abnormal conditions of the light emitting driver 20 during operation, i.e., test information. Exemplarily, the detection circuit 40 may include an external sampling circuit for detecting an output signal of the light emitting driver 20, and may also include an internal detection circuit for detecting a feedback signal of the light emitting driver 20, and may also include an external sampling circuit for detecting an output signal of the light emitting driver 20, and a detection circuit for detecting a feedback signal of the light emitting driver 20. The embodiment of the present invention is not limited to this, and those skilled in the art may set it as needed.

[0028] In addition, the backlight module is also provided with a controller 30, and the controller 30 is independently provided with the light driver 20. In other words, the controller 30 and the light driver 20 are different driving chips, which are used to perform different functions respectively. The controller 30 is electrically connected to the detection circuit 40, and the detection circuit 40 is electrically connected to the light driver 20, and then the detection circuit 40 sends the test signal collected during the operation of the light driver 20 to the controller 30. The controller 30 determines the risk level of the light driver 20 according to the test signal, and sends a control signal corresponding to the risk level to the light driver 20 to control the working state of the light driver 20. Exemplarily, the test signal detected by the detection circuit 40 is the abnormal condition of the light driver 20, and the risk levels corresponding to different abnormal conditions are not necessarily the same. For example, when the detection circuit 40 detects that an undervoltage abnormality occurs inside the light driver 20, the risk level corresponding to the light driver 20 is low at this time, and the impact on the light driver 20 is small. Part of the circuit of the light driver 20 can be restarted to solve the abnormal condition, and the light driver 20 can still operate normally afterwards. When the detection circuit 40 detects an overvoltage anomaly inside the light-emitting driver 20, the risk level corresponding to the light-emitting driver 20 is high, and the impact on the light-emitting driver 20 is relatively large. The light-emitting driver 20 must be turned off, otherwise the light-emitting driver 20 may be damaged. In this way, after obtaining the detection information of the light-emitting driver 20 through the detection circuit 40, the test information is processed in combination with the controller 30 to determine the risk level of the light-emitting driver. Different risk levels correspond to different processing methods, and then the controller 30 sends a corresponding control signal to the light-emitting driver 20 according to the determined risk level, so that the light-emitting driver 20 takes relevant measures corresponding to the risk level, thereby ensuring the normal operation of the light-emitting driver 20 and avoiding damage to the light-emitting driver 20 due to abnormal conditions, thereby improving the protection effect of the backlight module, and then improving the reliability of the backlight module.

[0029] It should be noted that when the detection circuit 40 includes an external sampling circuit for detecting the output signal of the light-emitting driver 20, the detection circuit 40 can be arranged outside the light-emitting driver 20, that is, the detection circuit 40 and the light-emitting driver 20 are arranged independently. When the detection circuit 40 includes an internal detection circuit for detecting the feedback signal of the light-emitting driver 20, the detection circuit 40 can be integrated inside the light-emitting driver 20, that is, the detection circuit 40 is a part of the circuit of the light-emitting driver 20 itself. It can be understood that the above embodiment is exemplarily described by taking the external sampling circuit being arranged outside the light-emitting driver 20 and the internal detection circuit being arranged inside the light-emitting driver 20 as an example, but it is not limited to this. In other embodiments, the external sampling circuit can be arranged inside the light-emitting driver 20, and the internal detection circuit can be arranged outside the light-emitting driver 20, that is, the embodiment of the present invention does not limit the specific position of the detection circuit 40, as long as the detection circuit 40 is used to detect the test information of the light-emitting driver 20.

[0030] In summary, the embodiment of the present invention sets a detection circuit 40 to detect the test information of the light-emitting driver 20, and sets a controller 30 to be electrically connected to the detection circuit 40 and the light-emitting driver 20 respectively, and determines the risk level of the light-emitting driver 20 according to the test information through the controller 30. Different risk levels correspond to different processing measures, and then the controller 30 sends a corresponding control signal to the light-emitting driver 20 according to the determined risk level, so that the light-emitting driver 20 takes relevant measures corresponding to the risk level, thereby ensuring that the normal operation of the light-emitting driver 20 is not affected, avoiding damage to the light-emitting driver 20 due to abnormal conditions, improving the protection effect of the backlight module, and thus improving the reliability of the backlight module.

[0031] Optionally, based on the above embodiment, Figure 2 is a functional schematic diagram of a backlight module provided by an embodiment of the present invention. Figure 2 The detection circuit 40 includes a sampling circuit 410 and / or an abnormality detection circuit 420. The controller 30 is used to determine the risk level of the light driver 20 according to the test information of the sampling circuit 410 and / or the test information of the abnormality detection circuit 420, and send a control signal to the light driver 20 according to the risk level to control the working state of the light driver 20.

[0032] For example, Figure 2In the illustrated embodiment, the detection circuit 40 includes a sampling circuit 410 and an abnormality detection circuit 420. The sampling circuit 410 is an external sampling circuit for detecting the output signal of the light emitting driver 20. The abnormality detection circuit 420 is an internal detection circuit for detecting the feedback signal of the light emitting driver 20. Thus, the controller 30 is electrically connected to the sampling circuit 410 and the abnormality detection circuit 420, respectively, and is used to obtain the test information of the sampling circuit 410 and the test information of the abnormality detection circuit 420 to determine the risk level of the light emitting driver 20. Different risk levels correspond to different treatment measures, and then the controller 30 sends a corresponding control signal to the light emitting driver 20 according to the determined risk level, so that the light emitting driver 20 takes relevant measures corresponding to the risk level, thereby ensuring that the normal operation of the light emitting driver 20 is not affected, avoiding damage to the light emitting driver 20 due to abnormal conditions, improving the protection effect of the backlight module, and thus improving the reliability of the backlight module.

[0033] It should be noted that Figure 2 The example in which the detection circuit 40 includes a sampling circuit 410 and an abnormality detection circuit 420, and the controller 30 determines the risk level of the light-emitting driver 20 according to the test information of the sampling circuit 410 and the test information of the abnormality detection circuit 420 is used for illustration only, but this is not limited to this. In other embodiments, the detection circuit 40 may also include only the sampling circuit 410, that is, the controller 30 determines the risk level of the light-emitting driver 20 according to the test information of the sampling circuit 410, or the detection circuit 40 may also include only the abnormality detection circuit 420, that is, the controller 30 determines the risk level of the light-emitting driver 20 according to the test information of the abnormality detection circuit 420. Those skilled in the art may set it as needed.

[0034] Optionally, based on the above embodiment, Figure 3 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention. Figure 3 , the detection circuit 40 includes a sampling circuit 410 and an abnormality detection circuit 420. Among them, the abnormality detection circuit 420 is integrated on the light-emitting driver 20. The light-emitting driver 20 includes a first output terminal 210 and an enable terminal 220. The controller 30 includes a second input terminal 310 and a second output terminal 320. The first output terminal 210 is electrically connected to the light-emitting element, and then the light-emitting driver 20 provides an output voltage to the light-emitting element through the first output terminal 210. The sampling circuit 410 is electrically connected to the first output terminal 210 and the second input terminal 310 respectively, and then the sampling circuit 410 collects the output voltage of the first output terminal 210 of the light-emitting driver 20, and transmits the output voltage to the controller 30 through the second input terminal 310. In addition, the light-emitting driver 20 also includes a feedback terminal 230 and an abnormality detection terminal 240, as shown Figure 3In the illustrated embodiment, the backlight module further includes an external feedback circuit 50, which is electrically connected to the first output terminal 210 and the feedback terminal 230 of the light emitting driver 20 to form a feedback loop. On the one hand, in the feedback loop, the output voltage of the first output terminal 210 is formed into a feedback signal through the external feedback circuit 520 and sent to the feedback terminal 230, and the light emitting driver 20 adjusts the output voltage of the first output terminal 210 according to the feedback signal of the feedback terminal 230. On the other hand, the abnormality detection circuit 420 is electrically connected to the feedback terminal 230 and the abnormality detection terminal 240, respectively, and the abnormality detection terminal 240 is electrically connected to the second input terminal 310, and then the abnormality detection circuit 420 determines the abnormality detection information according to the feedback signal of the feedback terminal 230, and the abnormality detection terminal 240 sends the abnormality detection information to the second input terminal 310 of the controller 30. The second output terminal 320 of the controller 30 is electrically connected to the enable terminal 220 of the light driver 20. After the controller 30 determines the risk level of the light driver 20 according to the test information of the sampling circuit 410 and / or the test information of the abnormality detection circuit 420 and determines the control signal according to the risk level, the control signal is sent to the enable terminal 220 of the light driver 20 through the second output terminal 320. In this way, the above connection method can improve the reliability of the backlight module while ensuring that the connection method between the detection circuit 40 and the light driver 20 is simple.

[0035] Optionally, based on the above embodiment, continue to refer to Figure 3 The controller 30 is used to determine the risk level of the light-emitting driver 20 according to the output voltage of the first output terminal 210 and / or the abnormality detection information, and when at least two different risk levels are determined, the control signal corresponding to the risk level with a higher priority is sent to the enable terminal 220 according to the priority order of the risk levels.

[0036] Specifically, since the sampling circuit 410 is used to collect the real-time output voltage of the first output terminal 210, the output voltage collected at the same time will not be within two non-overlapping data ranges at the same time, that is, when the controller 30 processes the output voltage of the first output terminal 210, two different risk levels will not be obtained. The abnormality detection circuit 420 processes the feedback signal of the feedback terminal 230. On the one hand, different abnormality detection modules in the abnormality detection circuit 420 are independently set, and multiple abnormality detection information can be detected at the same time, and multiple abnormality detection information can be reflected in the feedback signal at the same time. Therefore, the abnormality detection circuit 420 can generate multiple abnormality detection information according to the feedback signal of the feedback terminal 230, and the controller 30 can determine at least two different risk levels according to the multiple abnormality detection information. In addition, when the controller 30 processes the output voltage of the first output terminal 210 and the abnormality detection information at the same time, at least two different risk levels can also be determined. In this way, the controller 30 determines at least two different risk levels based on the abnormality detection information, or determines at least two different risk levels based on the output voltage of the first output terminal 210 and the abnormality detection information, and executes the risk level with the highest priority according to the priority allocation of the execution mechanism, that is, the control signal corresponding to the risk level with the highest priority is sent to the enable terminal 220, so that the light-emitting driver 20 performs the corresponding operation, and for the risk level with a lower priority, the corresponding operation is no longer executed. In this way, when a variety of different risk levels appear in the light-emitting driver 20, the low-priority operations are covered by executing the operation corresponding to the risk level with the highest priority, thereby further improving the protection effect of the backlight module and improving the reliability of the backlight module.

[0037] It should be noted that, in the above embodiment, the risk level may include a first risk level, a second risk level, a third risk level and a fourth risk level. Among them, the priority of the first risk level is higher than the priority of the second risk level, the priority of the second risk level is higher than the priority of the third risk level, and the priority of the third risk level is higher than the priority of the fourth risk level. Exemplarily, the first risk level may be an abnormal situation that cannot be repaired by restarting the light-emitting driver 20, and has the greatest impact on the light-emitting driver 20. If it is not handled in time, it is easy to damage the light-emitting driver 20. The abnormal situation of the second risk level can be repaired by re-powering on the enable end 220 of the light-emitting driver 20, and the light-emitting driver 20 can work normally after the repair. The abnormal situation of the third risk level can be repaired by restarting part of the circuit inside the light-emitting driver 20. During the repair process, other circuits inside the light-emitting driver 20 can work normally, and the impact on the work of the light-emitting driver 20 is small. The fourth risk level may be no abnormality, that is, the detection information of the light-emitting driver 20 is normal at this time. It is understandable that the above embodiment is only illustrative of four priority risk levels, but is not limited to this. In other embodiments, there may be five priority risk levels or three priority risk levels, and those skilled in the art may set them as needed.

[0038] Optionally, based on the above embodiment, Figure 4 FIG. 1 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention. Figure 4 The controller 30 is used to determine that the risk level of the light emitting driver 20 is the first risk level when the output voltage of the first output terminal 210 is greater than the first preset voltage, and send a first control signal to the enable terminal 220 to control the enable terminal 220 to be turned off.

[0039] For example, Figure 4In the illustrated embodiment, the detection circuit 40 includes a sampling circuit 410 as an example for explanation. The sampling circuit 410 is electrically connected to the first output terminal 210 of the light emitting driver 20 and the second input terminal 310 of the controller 30, respectively. The second output terminal 320 of the controller 30 is electrically connected to the enable terminal 220 of the light emitting driver 20. Specifically, the output voltage of the first output terminal 210 is regulated by the feedback signal of the feedback terminal 230. In the output voltage boosting stage, if an abnormality occurs in the feedback terminal 230, the feedback regulation will fail, that is, the output voltage of the first output terminal 210 will rise infinitely. When the rise exceeds the tolerable voltage of the light emitting driver 20, the light emitting driver 20 will be damaged. Therefore, the first preset voltage can be set to be close to the tolerable voltage of the light emitting driver 20, that is, the first preset voltage is slightly smaller than the tolerable voltage of the light emitting driver 20. When the controller 30 receives the output voltage of the first output terminal 210 collected by the sampling circuit 410, the output voltage of the first output terminal 210 is greater than the tolerable voltage of the light emitting driver 20. At the first preset voltage, it means that the output voltage is close to the tolerable voltage of the light-emitting driver 20. If it continues to work, the light-emitting driver 20 will be damaged. Then the controller 30 determines that the risk level of driving the light-emitting driver 20 is the first risk level, and sends a first control signal to the enable terminal 220 to control the enable terminal 220 to be turned off. In this way, by comparing the output voltage of the first output terminal 210 with the first preset voltage, it is determined whether the feedback terminal 230 is short-circuited, and when the feedback terminal 230 is short-circuited, the light-emitting driver 20 is turned off in time to avoid damage to the light-emitting driver 20, thereby improving the protection effect of the light-emitting driver 20.

[0040] Optionally, based on the above embodiment, continue to refer to Figure 4The controller 30 is used to determine that the risk level of the light-emitting driver is a second risk level when the output voltage is greater than or equal to the second preset voltage and less than or equal to the first preset voltage, and send a second control signal to the enable terminal 220 to control the enable terminal 220 to power on again. Specifically, the second preset voltage is less than the first preset voltage, and the second preset voltage may be an initial abnormal voltage for judging that the first output terminal 21 begins to be abnormal. For example, when the driving voltage of the light-emitting element is 24V, during normal operation, the output voltage of the first output terminal 210 will increase to a set value under the regulation of the feedback signal, and then will decrease to 24V and be output stably. If the feedback terminal 230 is abnormal, the output voltage of the first output terminal 210 will not decrease but will continue to increase after increasing to the set value, and the second preset voltage may be set to the set value. If the output voltage received by the controller 30 is greater than or equal to the second preset voltage and less than or equal to the first preset voltage, it means that the feedback terminal 230 is abnormal. However, since the output voltage has not reached the tolerable voltage of the light-emitting driver 20, the second control signal is sent to the enable terminal 220 to control the enable terminal 220 to be powered on again, that is, the abnormality of the feedback terminal 230 is attempted to be repaired by restarting the enable terminal 220 (the abnormality of the feedback terminal 230 is not necessarily a short circuit). After the repair is successful, the output voltage will gradually return to normal, and the light-emitting driver 20 continues to work normally. In this way, when the output voltage begins to be abnormal, the light emitting driver 20 is repaired by restarting the enabling terminal 220 , thereby improving the protection effect of the light emitting driver 20 without affecting the normal operation of the light emitting driver 20 .

[0041] It should be noted that in the above embodiment, if the output voltage has not returned to normal after the control enable terminal 220 is restarted a set number of times, it indicates that the abnormal condition of the enable terminal 220 is a short circuit fault and cannot be repaired by restarting. The controller 30 determines that the risk level of driving the light-emitting driver 20 is the first risk level, and sends a first control signal to the enable terminal 220 to control the enable terminal 220 to be turned off.

[0042] Optionally, based on the above embodiment, referring to 4, the controller 30 is used to determine that the risk level of the light emitting driver 20 is a fourth risk level when the output voltage is less than the second preset voltage, and send a fourth control signal to the enable terminal 220 to control the enable terminal 220 to remain powered on. Specifically, if the output voltage is less than the second preset voltage, it indicates that the output voltage of the light emitting driver 20 is within a normal range, and the fourth control signal is sent to the enable terminal 220 to control the enable terminal 220 to remain turned on to ensure the normal operation of the light emitting driver 20.

[0043] Optionally, based on the above embodiment, Figure 5 is a working timing diagram of a light emitting driver provided by an embodiment of the present invention, see Figure 4 and Figure 5 , the working stages of the backlight module include a charging stage S1 and a lifting stage S2. The light-emitting driver 20 also includes a first input terminal 250. In the charging stage S1, the light-emitting driver 20 is used to control the output voltage of the first output terminal 210 to gradually increase according to the input voltage of the first input terminal 250, until the difference between the output voltage and the input voltage is less than a preset value. In the lifting stage S2, the light-emitting driver 20 is used to control the output voltage of the first output terminal 210 to increase according to the feedback signal of the feedback terminal 230. The controller 30 determines the risk level of the light-emitting driver 20 based on the output voltage of the first output terminal 210 collected by the sampling circuit 410, and sends a control signal to the enable terminal 220 according to the risk level to control the working state of the light-emitting driver 20.

[0044] Specifically, before the light-emitting driver 20 drives the light-emitting element to emit light, there is also a boost stage for the output voltage. Exemplarily, assume that the input voltage of the first input terminal 250 is 12V, and the operating voltage of the light-emitting element is 24V. Then between the boost stages, the output voltage of the first output terminal 210 is 0, and the input voltage of the first input terminal 250 is 12V. The boost stage includes a charging stage S1 and a lifting stage S2. In the charging stage S1, the output voltage of the first output terminal 210 is adjusted according to the input voltage of the first input terminal 250, that is, the output voltage of the first output terminal 210 is gradually charged to close to 12V and then remains stable, and then enters the lifting stage S2. In the lifting stage S2, the output voltage of the first output terminal 210 is quickly raised to more than 24V according to the feedback signal of the feedback terminal 230, and then reduced to close to 24V. It can be understood that, since in the charging stage S1, the output voltage of the first output terminal 210 is adjusted according to the input voltage, the abnormal condition of the feedback terminal 230 has no effect on the charging stage S1, while in the lifting stage S2, the output voltage of the first output terminal 210 is adjusted by the feedback signal of the feedback terminal 230. Therefore, the abnormal condition of the feedback terminal 230 mainly affects the lifting stage S2 of the light-emitting driver 20, that is, in the lifting stage S2, the controller 30 determines the risk level of the light-emitting driver 20 according to the output voltage of the first output terminal 210 collected by the sampling circuit 410, and sends a control signal to the enable terminal 220 according to the risk level to control the working state of the light-emitting driver 20. In this way, when the detection circuit 40 only includes the sampling circuit 410, the controller 30 can only process the output voltage collected by the sampling circuit 410 in the lifting stage S2, thereby reducing the power consumption of the backlight module on the basis of improving the protection effect of the backlight module.

[0045] It should be noted that in the boost stage, there are instructions for the light-emitting driver 20 to adjust the output voltage of the first output terminal 210 according to the feedback signal of the feedback terminal 230, and instructions for the light-emitting driver 20 to perform operations corresponding to the risk level according to the control signal of the enable terminal 220. When the two instructions exist at the same time, the instruction corresponding to the high risk level is executed first.

[0046] Optionally, based on the above embodiment, Figure 6 FIG. 1 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention. Figure 6 , the abnormality detection circuit 420 includes an overvoltage detection module 421 and an overcurrent detection module 422. The overvoltage detection module 421 is used to generate overvoltage abnormality detection information according to the feedback signal, and send the overvoltage abnormality information to the abnormality detection terminal 240. The overcurrent detection module 422 is used to generate overcurrent abnormality detection information according to the feedback signal, and send the overcurrent abnormality information to the abnormality detection terminal 240. The controller 30 is used to determine that the risk level of the light emitting driver 20 is the first risk level when receiving the overvoltage abnormality detection information or the overcurrent abnormality detection information, and send a first control signal to the enable terminal 220 to control the enable terminal 220 to be closed.

[0047] For example, Figure 6 In the illustrated implementation, the detection circuit 40 includes an abnormality detection circuit 420 as an example for description. Specifically, the feedback signal in the external feedback circuit 50 is transmitted to the feedback terminal 230, and the overvoltage detection module 421 of the abnormality detection circuit 420 can determine whether the input voltage of the first input terminal 250 of the light emitting driver 20 or the output voltage of the first output terminal 210 is overvoltage abnormal according to the feedback signal, and if an overvoltage abnormality occurs, the overvoltage abnormality detection information is sent to the controller 30 through the abnormality detection terminal 240. Similarly, the overcurrent detection module 422 can determine whether an overcurrent abnormality occurs at the first input terminal 250 and the first output terminal 210 according to the feedback signal, and send the overcurrent abnormality detection information to the controller 30 through the abnormality detection terminal 240 when an overcurrent abnormality occurs. Since the overcurrent anomaly or overvoltage anomaly has a great impact on the light driver 20 and cannot be repaired by restarting the light driver 20, the controller 30 determines that the risk level of the light driver 20 is the first risk level when receiving the overvoltage anomaly detection information or the overcurrent anomaly detection information, and sends a first control signal to the enable terminal 220 to control the enable terminal 220 to be turned off. In this way, by setting the abnormality detection circuit 420 to include the overvoltage detection module 421 and the overcurrent detection module 422, when the light driver 20 has an overvoltage anomaly or an overcurrent anomaly, the light driver 20 is turned off in time, thereby avoiding damage to the light driver 20 and improving the reliability of the backlight module.

[0048] Optionally, based on the above embodiment, Figure 7 FIG. 1 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention. Figure 5 and Figure 7 , the working stage of the backlight module also includes a stable stage S3, in which the output voltage of the first output terminal 210 remains basically the same. Specifically, the stable stage S3 is after the timing of the lifting stage S2. In the lifting stage S2, the output voltage of the first output terminal 210 is first raised and then reduced to a level close to the working voltage of the light-emitting element. In the stable stage S3, the output voltage of the first output terminal 210 is reduced to be consistent with the working voltage of the light-emitting element, and the output is stable. In addition, the light-emitting element begins to emit light. On this basis, the abnormality detection circuit 420 includes a light-emitting element detection module 423. The light-emitting element detection module 423 is used to send the abnormality information of the light-emitting element to the controller 30 through the abnormality detection terminal 240 when detecting that the light-emitting element is abnormal. Since the abnormality of the light-emitting element is a fault on the light-emitting element, such as a short circuit or an open circuit of the light-emitting element, it cannot be repaired by restarting the light-emitting driver 20. Therefore, in the stable stage S3, when the controller 30 receives the abnormality information of the light-emitting element, it determines that the risk level of the light-emitting driver 20 is the first risk level, and sends a first control signal to the enable terminal 220 to control the enable terminal 220 to be closed. In this way, by providing the abnormality detection circuit 420 including the light emitting element detection module 423, when the controller 30 detects that the light emitting element is abnormal, the light emitting driver 20 is turned off in time, thereby improving the reliability of the backlight module.

[0049] Optionally, based on the above embodiment, Figure 8 FIG. 1 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention. Figure 8, the abnormality detection circuit 420 includes a temperature detection module 424, and the temperature detection module 424 is used to send temperature abnormality information to the controller 30 through the abnormality detection terminal 240 when it is detected that the temperature of the light emitting driver 20 is greater than the preset temperature. Specifically, the temperature detection module 424 can detect the temperature of the light emitting driver 20. When the backlight module works normally, the temperature of the light emitting driver 20 is less than the preset temperature. When the temperature of the light emitting driver 20 is greater than the preset temperature, on the one hand, it may be that other components in the backlight module are abnormal, resulting in abnormal temperature of the light emitting driver 20. On the other hand, it may be that the abnormality of the light emitting driver 20 itself causes the temperature to be too high. Both of these situations cannot be repaired by restarting the light emitting driver 20, and have a greater impact on the light emitting driver 20. Then, the controller 30 receives the temperature abnormality information, determines that the risk level of the light emitting driver 20 is the first risk level, and sends a first control signal to the enable terminal 220, thereby controlling the enable terminal 220 to be closed. In this way, by setting the abnormality detection circuit 420 to include the temperature detection module 424, when the controller 30 detects that the temperature is abnormal, the light emitting driver 20 is turned off in time, thereby improving the reliability of the backlight module.

[0050] Optionally, based on the above embodiment, Fig. 9 FIG. 1 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention. Fig. 9 , the abnormality detection circuit 420 includes an undervoltage detection module 425, which is used to generate undervoltage abnormality information according to the feedback signal, and send the undervoltage abnormality information to the controller 30 through the abnormality detection terminal 240. Specifically, the undervoltage abnormality has little effect on the light-emitting driver 20, or is a normal phenomenon in certain stages (such as the boost stage, the output voltage is low and needs to be boosted), and can be repaired by restarting part of the circuit in the light-emitting driver 20. During the restart process, other circuits of the light-emitting driver 20 can work normally. Then, in the boost stage, when the controller 30 receives the undervoltage abnormality information, it determines that the risk level of the light-emitting driver 20 is the third risk level, and sends a third control signal to the enable terminal 220 to control the restart of part of the circuit of the light-emitting driver 20. In this way, by setting the abnormality detection circuit 420 to include the undervoltage detection module 425, when the controller 30 detects the occurrence of the undervoltage abnormality, it is repaired by restarting part of the circuit of the light-emitting driver 20, and the normal operation of the light-emitting driver 20 is guaranteed on the basis of improving the reliability of the backlight module.

[0051] It is understandable that the above embodiments are only schematically described with reference to the working conditions of each module in the abnormality detection circuit 420, but the abnormality detection circuit 420 is not limited to only including one module. In other embodiments, Fig.10 is a functional schematic diagram of another backlight module provided by an embodiment of the present invention, see Fig.10 The abnormality detection circuit 420 may include an overvoltage detection module 421 , an overcurrent detection module 422 , a light emitting element detection module 423 , a temperature detection module 424 and an undervoltage detection module 425 .

[0052] Optionally, based on the above embodiment, Fig.11 is a schematic diagram of a sampling circuit provided by an embodiment of the present invention. Fig.11 , the sampling circuit 410 includes a first resistor R1, a second resistor R2 and a first capacitor C1. The first end of the first resistor R1 is electrically connected to the second input terminal 310, and the second end of the first resistor R1 is electrically connected to the first output terminal 210, the first end of the second resistor R2 and the first plate of the first capacitor C1 respectively. The second end of the second resistor R2 is electrically connected to the power supply terminal, and the second plate of the first capacitor C1 is electrically connected to the ground terminal. Specifically, the sampling circuit 410 can be an analog-to-digital conversion unit, that is, the analog signal output by the first output terminal 210 is converted into a digital signal through the first resistor R1, the second resistor R2 and the first capacitor C1 and transmitted to the second input terminal 310 of the controller 30, so as to facilitate the controller 30 to process the received output voltage and ensure that the structure of the sampling circuit 410 is simple.

[0053] Understandably, Fig.11 The sampling circuit includes two resistors and one capacitor as an example, but is not limited thereto. In other embodiments, the sampling circuit may include other numbers of resistors and capacitors, and those skilled in the art may set them as needed.

[0054] It should be noted that, in one embodiment, the sampling circuit 410 may also be integrated into the light emitting driver 20 , that is, the abnormality detection circuit 420 and the sampling circuit 410 are both integrated into the light emitting driver 20 , thereby achieving the purpose of reducing peripheral devices and reducing costs.

[0055] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Fig.12 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention. Fig.12 As shown, the display device includes the backlight module in the above embodiment, and further includes a display panel 01. The display device provided in the embodiment of the present invention has the corresponding beneficial effects of the backlight module provided in the embodiment of the present invention, which will not be repeated here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a vehicle-mounted display device, which is not limited in the embodiment of the present invention.

[0056] It can be seen from the above embodiments that the backlight module and display device provided by the present invention at least achieve the following beneficial effects: the backlight module provided by the present invention includes: a light-emitting lamp board, on which a plurality of light-emitting elements are arranged; a light-emitting driver, a controller and a detection circuit, the light-emitting driver is electrically connected to the light-emitting element, and is used to drive the plurality of light-emitting elements to emit light, and the controller is electrically connected to the light-emitting driver and the detection circuit respectively; the controller is used to determine the risk level of the light-emitting driver according to the test information collected by the detection circuit, and send a control signal to the light-emitting driver according to the risk level to control the working state of the light-emitting driver. The test information of the light-emitting driver is obtained by setting the detection circuit, and the test information is sent to the controller, the controller processes the test information, determines the risk level of the light-emitting driver, and different risk levels correspond to different processing methods, and then the controller sends a corresponding control signal to the light-emitting driver according to the determined risk level, so that the light-emitting driver takes relevant measures corresponding to the risk level. Therefore, on the basis of ensuring the normal operation of the light-emitting driver, the problem that the light-emitting driver cannot be effectively detected due to the single abnormality detection means of the liquid crystal display device, thereby causing the light-emitting driver to fail to work normally, and finally causing the backlight circuit to fail, is solved, and the reliability of the backlight module is improved.

[0057] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A backlight module, characterized in that: include: A light-emitting lamp board, wherein a plurality of light-emitting elements are arranged on the light-emitting lamp board; A light-emitting driver, a controller and a detection circuit, wherein the light-emitting driver is electrically connected to the light-emitting elements and is used to drive the plurality of light-emitting elements to emit light, and the controller is electrically connected to the light-emitting driver and the detection circuit respectively; The controller is used to determine the risk level of the light emitting driver according to the test information collected by the detection circuit, and send a control signal to the light emitting driver according to the risk level to control the working state of the light emitting driver.

2. The backlight module according to claim 1, characterized in that: The detection circuit includes a sampling circuit and / or an abnormality detection circuit; The controller is used to determine the risk level of the light-emitting driver according to the test information of the sampling circuit and / or the test information of the abnormality detection circuit, and send a control signal to the light-emitting driver according to the risk level to control the working state of the light-emitting driver.

3. The backlight module according to claim 2, characterized in that: The abnormality detection circuit is integrated on the light emitting driver; The light-emitting driver comprises a first output terminal and an enable terminal; the controller comprises a second input terminal and a second output terminal; the first output terminal is electrically connected to the light-emitting element; the sampling circuit is electrically connected to the first output terminal and the second input terminal respectively; the second output terminal is electrically connected to the enable terminal; the light-emitting driver further comprises a feedback terminal and an abnormality detection terminal, and the abnormality detection circuit is electrically connected to the feedback terminal and the abnormality detection terminal respectively; The abnormality detection end is electrically connected to the second input end, the abnormality detection circuit is used to determine abnormality detection information according to the feedback signal of the feedback end, and the abnormality detection end sends the abnormality detection information to the controller; The backlight module further includes an external feedback circuit, and the external feedback circuit is electrically connected to the first output end and the feedback end respectively to form a feedback loop.

4. The backlight module according to claim 3, characterized in that: The controller is used to determine the risk level of the light-emitting driver according to the output voltage of the first output terminal and / or the abnormality detection information, and when at least two different risk levels are determined, send the control signal corresponding to the risk level with a higher priority to the enable terminal in accordance with the priority order of the risk levels.

5. The backlight module according to claim 4, characterized in that: The risk levels include a first risk level, a second risk level, a third risk level and a fourth risk level; wherein the priority of the first risk level is higher than the priority of the second risk level, the priority of the second risk level is higher than the priority of the third risk level, and the priority of the third risk level is higher than the priority of the fourth risk level.

6. The backlight module according to claim 3, characterized in that: The controller is used for determining that the risk level of the light emitting driver is a first risk level when the output voltage of the first output terminal is greater than a first preset voltage, and sending a first control signal to the enable terminal to control the enable terminal to be turned off.

7. The backlight module according to claim 3, characterized in that: The controller is used to determine that the risk level of the light-emitting driver is a second risk level when the output voltage is greater than or equal to the second preset voltage and less than or equal to the first preset voltage, and send a second control signal to the enable end to control the enable end to power on again.

8. The backlight module according to claim 3, characterized in that: The controller is used for determining that the risk level of the light emitting driver is a fourth risk level when the output voltage is less than the second preset voltage, and sending a fourth control signal to the enable end to control the enable end to remain powered on.

9. The backlight module according to claim 3, characterized in that: The working stages of the backlight module include a charging stage and a lifting stage; The light emitting driver further comprises a first input terminal; in the charging stage, the light emitting driver is used to control the output voltage of the first output terminal to gradually increase according to the input voltage of the first input terminal, until the difference between the output voltage and the input voltage is less than a preset value; In the raising stage, the light emitting driver is used to control the output voltage raising of the first output terminal according to the feedback signal of the feedback terminal; The controller determines the risk level of the light emitting driver according to the output voltage of the first output terminal collected by the sampling circuit, and sends a control signal to the enabling terminal according to the risk level to control the working state of the light emitting driver.

10. The backlight module according to claim 3, characterized in that: The abnormality detection circuit includes an overvoltage detection module and an overcurrent detection module; The overvoltage detection module is used to generate overvoltage abnormality detection information according to the feedback signal, and send the overvoltage abnormality information to the abnormality detection end; the overcurrent detection module is used to generate overcurrent abnormality detection information according to the feedback signal, and send the overcurrent abnormality information to the abnormality detection end; The controller is used to determine that the risk level of the light emitting driver is a first risk level when receiving the overvoltage abnormality detection information or the overcurrent abnormality detection information, and send a first control signal to the enable end to control the enable end to be turned off.

11. The backlight module according to claim 3, characterized in that: The working phase of the backlight module further includes a stable phase, during which the output voltage of the first output terminal remains substantially consistent; The abnormality detection circuit includes a light emitting element detection module, and the light emitting element detection module is used to send abnormality information of the light emitting element to the controller through the abnormality detection terminal when detecting that the light emitting element is abnormal; In the stable stage, the controller is used to determine that the risk level of the light emitting driver is the first risk level when receiving the abnormal information of the light emitting element, and send a first control signal to the enable end to control the enable end to be turned off.

12. The backlight module according to claim 3, characterized in that: The abnormality detection circuit includes a temperature detection module, and the temperature detection module is used to send temperature abnormality information to the controller through the abnormality detection end when detecting that the temperature of the light-emitting driver is greater than a preset temperature; The controller is used for determining that the risk level of the light emitting driver is a first risk level when receiving the temperature abnormality information, and sending a first control signal to the enabling end to control the enabling end to be turned off.

13. The backlight module according to claim 3, characterized in that: The abnormality detection circuit includes an undervoltage detection module, which is used to generate undervoltage abnormality information according to the feedback signal and send the undervoltage abnormality information to the controller through the abnormality detection terminal; In the boost phase, the controller is used to determine that the risk level of the light emitting driver is a third risk level when receiving the undervoltage abnormality information, and send a third control signal to the enable terminal to control a partial circuit of the light emitting driver to restart.

14. The backlight module according to claim 2, characterized in that: The sampling circuit includes a first resistor, a second resistor and a first capacitor; The first end of the first resistor is electrically connected to the second input end, and the second end of the first resistor is electrically connected to the first output end, the first end of the second resistor, and the first plate of the first capacitor respectively; The second end of the second resistor is electrically connected to the power supply end, and the second electrode plate of the first capacitor is electrically connected to the ground end.

15. A display device, characterized in that: The backlight module comprises the backlight module described in any one of claims 1 to 14.

Images