Backlight module driving circuit and method and display panel

Abstract

According to the backlight module driving circuit and method and the display panel, the lamp set state detection unit is arranged to detect the state of the main lamp set so as to determine whether the main lamp set has the display problem or not, and meanwhile, the adjacent standby lamp sets are arranged so that when the main lamp set has the display problem, the standby lamp sets can be switched to the standby lamp sets. The main lamp group can be subjected to display compensation through the standby lamp group, so that the problem of brightness reduction or non-uniform brightness display is avoided.

Description

Technical Field

[0001] The present invention relates to the field of display, and in particular to a backlight module driving circuit, method and display panel. Background Art

[0002] In LCD display devices, backlight is an essential component; in practical applications, if the light-emitting diodes in the backlight are damaged, it will affect the brightness and display uniformity of the display device. Summary of the invention

[0003] The main purpose of the present invention is to provide a backlight module driving circuit, method and display panel, aiming to solve the problem in the prior art that the light emitting diodes in the backlight are damaged, affecting the brightness and display uniformity of the display device.

[0004] To achieve the above-mentioned object, the present invention provides a backlight module driving circuit, the backlight module driving circuit comprises a plurality of main and standby light groups and a plurality of light group driving modules, wherein the main and standby light groups are connected to the light group driving modules in a one-to-one correspondence; the main and standby light groups comprise a main light group and a standby light group arranged adjacently; the light group driving module comprises a light group state detection unit, a first switch unit, a second switch unit and a control unit; the detection end of the light group state detection unit is connected to the main light group, the output end of the light group state detection unit is connected to the input end of the control unit, the output end of the control unit is connected to the control end of the first switch unit and the control end of the second switch unit, the first switch unit is connected in series with the main light group, and the second switch unit is connected in series with the standby light group; wherein:

[0005] The light group state detection unit is used to detect the light emitting state of the main light group to generate a detection signal, and send the detection signal to the control unit;

[0006] The control unit is used to receive the detection signal sent by the light group state detection unit, and determine the target switch state of the first switch unit and the second switch unit according to the detection signal, and send a switch signal corresponding to the target switch state to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their own switch state based on the switch signal.

[0007] Optionally, the lamp group state detection unit includes a current detection subunit and a comparison subunit; the detection end of the current detection subunit is connected to the main lamp group, the output end of the current detection subunit is connected to the input end of the comparison subunit, and the output end of the comparison subunit is connected to the input end of the control unit; wherein:

[0008] The current detection subunit is used to detect the current on the branch where the main lamp group is located, obtain a current indication signal, and send the current indication signal to the comparison subunit;

[0009] The comparison subunit is used to compare the current indication signal sent by the current detection subunit with a preset current signal to obtain the detection signal.

[0010] Optionally, the current detection subunit includes a first resistor; wherein:

[0011] The first resistor is connected between the main lamp group and the ground, and one end of the first resistor connected to the main lamp group is connected to the input end of the comparison subunit as the output end of the current detection subunit.

[0012] Optionally, the comparison subunit includes a first comparator, a second comparator and a reference voltage generating circuit; wherein:

[0013] The inverting input terminal of the first comparator is connected to the input terminal of the current detection subunit, the non-inverting input terminal of the first comparator is connected to the first output terminal of the reference voltage generating circuit, and the output terminal of the first comparator is connected to the first input terminal of the control unit as the first output terminal of the comparison subunit;

[0014] The non-inverting input terminal of the second comparator is connected to the input terminal of the current detection subunit, the inverting input terminal of the second comparator is connected to the second output terminal of the reference voltage generating circuit, and the output terminal of the second comparator is connected to the second input terminal of the control unit as the second output terminal of the comparison subunit, wherein the voltage output by the first output terminal of the reference voltage generating circuit is greater than the voltage output by the second output terminal.

[0015] Optionally, the reference voltage generating circuit includes a second resistor, a third resistor and a fourth resistor; wherein:

[0016] The first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded;

[0017] Among them, the second end of the second resistor is connected to the non-inverting input terminal of the first comparator as the first output terminal of the reference voltage generating circuit, and the second end of the third resistor is connected to the non-inverting input terminal of the second comparator as the second output terminal of the reference voltage generating circuit.

[0018] To achieve the above object, the present invention provides a backlight module driving method, the backlight module driving method is applied to the backlight module driving circuit according to any one of claims 1 to 5; the backlight module driving method comprises:

[0019] Receiving the detection signal sent by the light group state detection unit, wherein the detection signal is generated by the light group state detection unit by detecting the light emitting state of the main light group;

[0020] Determine the target switch state of the first switch unit and the second switch unit according to the detection signal, and obtain a switch signal corresponding to the target switch state;

[0021] The switch signal is sent to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their switch states based on the switch signal.

[0022] Optionally, determining the target switch states of the first switch unit and the second switch unit according to the detection signal includes:

[0023] Acquire a first comparison signal and a second comparison signal in the detection signal, wherein the first comparison signal is output by a first comparator, and the second comparison signal is output by a second comparator;

[0024] Matching target switch states corresponding to the first comparison signal and the second comparison signal.

[0025] Optionally, the matching of the target switch state corresponding to the first comparison signal and the second comparison signal includes:

[0026] Determining whether the first comparison signal is at a low level;

[0027] If the first comparison signal is at a low level, the target switch state of the first switch unit is on, and the target switch state of the second switch unit is off.

[0028] Optionally, the determining whether the first comparison signal is at a low level comprises:

[0029] If the first comparison signal is at a high level, determining whether the second comparison signal is at a high level;

[0030] If the second comparison signal is at a high level, the target switch state of the first switch unit is on, and the target switch state of the second switch unit is on;

[0031] If the second comparison signal is at a low level, the target switch state of the first switch unit is off, and the target switch state of the second switch unit is on.

[0032] To achieve the above object, the present invention further provides a display panel, which includes the backlight module driving circuit as described above.

[0033] The present invention proposes a backlight module driving circuit, method and display panel, wherein the backlight module driving circuit includes multiple main and standby light groups and multiple light group driving modules, wherein the main and standby light groups are connected to the light group driving modules in a one-to-one correspondence; the main and standby light groups include a main light group and a standby light group that are adjacently arranged; the light group driving module includes a light group state detection unit, a first switch unit, a second switch unit and a control unit; the detection end of the light group state detection unit is connected to the main light group, the output end of the light group state detection unit is connected to the input end of the control unit, and the output end of the control unit is connected to the control end of the first switch unit and the control end of the second switch unit , the first switch unit is connected in series with the main light group, and the second switch unit is connected in series with the backup light group; wherein: the light group state detection unit is used to detect the light emitting state of the main light group to generate a detection signal, and send the detection signal to the control unit; the control unit is used to receive the detection signal sent by the light group state detection unit, and determine the target switch state of the first switch unit and the second switch unit according to the detection signal, and send a switch signal corresponding to the target switch state to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their own switch state based on the switch signal. The state of the main light group is detected by setting the light group state detection unit, so as to determine whether the main light group has a display problem, and at the same time, an adjacent backup light group is set, so that when the main light group has a display problem, the backup light group can compensate for the display of the main light group, thereby avoiding the problem of reduced brightness or uneven brightness display. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0036] Figure 1 It is a module structure diagram of the first embodiment of the backlight module driving circuit of the present invention;

[0037] Figure 2It is a structural schematic diagram of a switch unit in a backlight module driving circuit of the present invention;

[0038] Figure 3 It is a schematic diagram of the overall structure of the backlight module driving circuit of the present invention;

[0039] Figure 4 It is a flowchart diagram of a first embodiment of a backlight module driving method of the present invention.

[0040] Description of Figure Numbers:

[0041] Label name Label name 100 Main and standby light group 2121 Reference voltage generation circuit 110 Main light group 220 The first switch unit 120 Spare light set 230 The second switch unit 200 Light group driver module 240 Control unit 210 Light group status detection unit R1~R4 The first resistor to the fourth resistor 211 Current sensing subunit Q1~Q2 First comparator to second comparator 212 Comparison subunits DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present application.

[0043] The present invention provides a backlight module driving circuit, referring to Figure 1 , Figure 1 : This is a module structure diagram of the first embodiment of the backlight module driving circuit of the present invention, the backlight module driving circuit includes a plurality of main and standby lamp groups 100 and a plurality of lamp group driving modules 200, wherein the main and standby lamp groups 100 are connected to the lamp group driving modules 200 in a one-to-one correspondence; the main and standby lamp groups 100 include a main lamp group 110 and a standby lamp group 120 arranged adjacently; the lamp group driving module 200 includes a lamp group state detection unit 210, a first switch unit 220, a second switch unit 230 and a control unit 240; the detection end of the lamp group state detection unit 210 is connected to the main lamp group 110, the output end of the lamp group state detection unit 210 is connected to the input end of the control unit 240, the output end of the control unit 240 is connected to the control end of the first switch unit 220 and the control end of the second switch unit 230, the first switch unit 220 is connected in series with the main lamp group 110, and the second switch unit 230 is connected in series with the standby lamp group 120; wherein:

[0044] The light group state detection unit 210 is used to detect the light emitting state of the main light group 110 to generate a detection signal, and send the detection signal to the control unit 240;

[0045] The control unit 240 is used to receive the detection signal sent by the light group state detection unit 210, and determine the target switch state of the first switch unit 220 and the second switch unit 230 according to the detection signal, and send a switch signal corresponding to the target switch state to the first switch unit 220 and the second switch unit 230, so that the first switch unit 220 and the second switch unit 230 adjust their own switch state based on the switch signal.

[0046] Multiple groups of lights are arranged in the backlight module. Generally, the light groups are composed of LEDs connected in series. The positive poles of different light groups are connected to the power supply, and the negative poles of the light groups are grounded. It is understandable that when the LEDs in one or more groups of lights fail, the brightness of the position where the light group is arranged in the backlight module will decrease, resulting in uneven brightness. At the same time, it will also affect the overall display brightness of the backlight module.

[0047] In the present embodiment, a main light group 110 and a backup light group 120 are provided, and the main light group 110 and the backup light group 120 are provided adjacent to each other; when the main light group 110 emits light normally, the backup light group 120 is in a non-illuminating state; and when the main light group 110 has a lighting problem, the backup light group 120 can be lit to compensate for the insufficient brightness of the main light group 110, so that when the main light group 110 has a lighting problem, the brightness of the area where the main and backup light groups 100 are located can still be guaranteed, thereby avoiding the problem of reduced or uneven brightness.

[0048] It should be noted that the main light group 110 and the backup light group 120 may be configured in the same manner as regards LEDs, that is, include the same number of LEDs connected in series; or they may be configured differently.

[0049] The light group state detection unit 210 is used to detect the light emitting state of the main light group 110 ; the detection signal is used to reflect the actual light emitting state of the main light group 110 .

[0050] It can be understood that when the lighting state of the main light group 110 changes, the electrical signal on the branch where the main light group 110 is located will also change; for example, when an LED in the main light group 110 is short-circuited, since the LEDs in the main light group 110 are connected in series, the branch where the main light group 110 is located is short-circuited and no current is generated. Therefore, the lighting state of the main light group 110 can be determined by detecting the signal.

[0051] The control unit 240 determines the lighting state of the main lamp group 110 according to the detection signal, and further determines the target switching states of the first switch unit 220 and the second switch unit 230 based on the lighting state.

[0052] It can be understood that the first switch unit 220 is connected in series with the main lamp group 110. Therefore, when the first switch unit 220 is turned on, the branch where the main lamp group 110 is located can form a loop through the first switch unit 220, that is, the main lamp group 110 is set to work. When the first switch unit 220 is turned off, the current loop of the branch where the main lamp group 110 is located is disconnected by the first switch unit 220 and cannot form a loop, that is, the main lamp group 110 is set to be inoperative.

[0053] Similarly, the second switch unit 230 is connected in series with the backup lamp group 120. Therefore, when the second switch unit 230 is turned on, the circuit where the backup lamp group 120 is located can form a loop through the second switch unit 230, that is, the backup lamp group 120 is set to work; when the second switch unit 230 is turned off, the current loop of the circuit where the backup lamp group 120 is located is disconnected by the second switch unit 230 and a loop cannot be formed, that is, the backup lamp group 120 is set to not work.

[0054] It can be seen from the function of the aforementioned backup light group 120 that the backup light group 120 serves as a light supplement for the main light group 110; therefore, the working scenes of the main light group 110 and the backup light group 120 can be set based on actual needs, that is, the matching relationship between the detection signal and the first switch unit 220 and the second switch unit 230 is determined.

[0055] The specific structures of the first switch unit 220 and the second switch unit 230 can be set based on actual needs. Figure 2 For example, the first switch unit 220 or the second switch unit 230 includes a driving circuit and a switch tube, the control end of the driving circuit is connected to the output end of the control unit 240, and the control end of the switch tube is connected to the output end of the driving circuit; the switch tube is such as a MOS tube, a triode, etc.

[0056] In this embodiment, a light group state detection unit 210 is provided to detect the state of the main light group 110, so as to determine whether the main light group 110 has a display problem. At the same time, an adjacent spare light group 120 is provided, so that when the main light group 110 has a display problem, the spare light group 120 can be used to compensate for the display of the main light group 110, so as to avoid the problem of reduced brightness or uneven brightness display.

[0057] Further, see also Figure 3 The lamp group state detection unit 210 includes a current detection subunit 211 and a comparison subunit 212; the detection end of the current detection subunit 211 is connected to the main lamp group 110, the output end of the current detection subunit 211 is connected to the input end of the comparison subunit 212, and the output end of the comparison subunit 212 is connected to the input end of the control unit 240; wherein:

[0058] The current detection subunit 211 is used to detect the current on the branch where the main lamp group 110 is located, obtain a current indication signal, and send the current indication signal to the comparison subunit 212;

[0059] The comparing subunit 212 is used for comparing the current indication signal sent by the current detecting subunit 211 with a preset current signal to obtain the detection signal.

[0060] The current detection subunit 211 detects the current on the branch where the main light group 110 is located; it is understandable that when there is a problem with the LED in the main light group 110, it will affect the current on the branch where the main light group 110 is located; for example, when there is a short circuit in the LED in the main light group 110, since the LEDs in the main light group 110 are connected in series, the branch where the main light group 110 is located is short-circuited and no current is generated; for example, when there is a local short circuit in the LED in the main light group 110, it will cause the current in the branch where the main light group 110 is located to decrease; therefore, the lighting state of the main light group 110 can be determined by detecting the current in the branch where the main light group 110 is located.

[0061] The comparison subunit 212 is used to compare the current indication signal with the preset current signal to obtain a detection signal; the current indication signal directly indicates the current state of the branch where the main lamp group 110 is located; the preset current signal is used to indicate the current state of the branch where the main lamp group 110 is located under different states of the main lamp group 110, such as the preset current signal can indicate the current state corresponding to the critical value of normal light emission and problem occurrence of the main lamp group 110, and can also indicate the current state corresponding to different degrees of LED failure in the main lamp group 110; the preset current signal can be set based on actual needs; such as determining through preliminary experiments the current state corresponding to different light emission states of the main lamp group 110 under specific power supply parameters and LED parameters.

[0062] Furthermore, the current detection subunit 211 includes a first resistor R1; wherein:

[0063] The first resistor R1 is connected between the main lamp group 110 and the ground, and one end of the first resistor R1 connected to the main lamp group 110 is connected to the input end of the comparison subunit 212 as the output end of the current detection subunit 211 .

[0064] The first resistor R1 is connected between the main lamp group 110 and the ground; the first resistor R1 and the main lamp group 110 are in series, therefore, the current on the first resistor R1 is consistent with the current on the main lamp group 110 and the resistance value of the first resistor R1 is fixed, when the current on the main lamp group 110 changes, the current on the first resistor R1 changes, and the voltage at the first end of the first resistor R1 changes accordingly, therefore, the luminous state of the main lamp group 110 can be determined based on the voltage at the first end of the first resistor R1.

[0065] It is understandable that in order to avoid affecting the light emission of the LED and to facilitate the setting of the comparison logic, in this embodiment, the first resistor R1 is specifically set between the main lamp group 110 and the ground.

[0066] Furthermore, the comparison subunit 212 includes a first comparator Q1, a second comparator Q2 and a reference voltage generating circuit 2121; wherein:

[0067] The inverting input terminal of the first comparator Q1 is connected to the input terminal of the current detection subunit 211, the non-inverting input terminal of the first comparator Q1 is connected to the first output terminal of the reference voltage generation circuit 2121, and the output terminal of the first comparator Q1 is connected to the first input terminal of the control unit 240 as the first output terminal of the comparison subunit 212;

[0068] The non-inverting input terminal of the second comparator Q2 is connected to the input terminal of the current detection sub-unit 211, the inverting input terminal of the second comparator Q2 is connected to the second output terminal of the reference voltage generating circuit 2121, and the output terminal of the second comparator Q2 is connected to the second input terminal of the control unit 240 as the second output terminal of the comparison sub-unit 212, wherein the voltage output by the first output terminal of the reference voltage generating circuit 2121 is greater than the voltage output by the second output terminal.

[0069] In this embodiment, a first comparator Q1 and a second comparator Q2 are provided to realize the division of the various states of the main lamp group 110 .

[0070] When the current indication signal is greater than or equal to the voltage V1 outputted by the first output terminal of the reference voltage generating circuit 2121, the signal at the non-inverting input terminal of the first comparator Q1 is less than the signal at the inverting input terminal, and the first comparator Q1 outputs a low-level signal, and the signal at the non-inverting input terminal of the second comparator Q2 is greater than the signal at the inverting input terminal, and the second comparator Q2 outputs a high-level signal;

[0071] When the current indication signal is less than V1 and greater than the voltage V2 outputted by the second output terminal of the reference voltage generating circuit 2121, the signal at the non-inverting input terminal of the first comparator Q1 is greater than or equal to the signal at the inverting input terminal, the first comparator Q1 outputs a high-level signal, the signal at the non-inverting input terminal of the second comparator Q2 is greater than the signal at the inverting input terminal, and the second comparator Q2 outputs a high-level signal;

[0072] When the current indication signal is less than or equal to the voltage V2 output by the second output terminal of the reference voltage generating circuit 2121, the signal at the non-inverting input terminal of the first comparator Q1 is greater than or equal to the signal at the inverting input terminal, and the first comparator Q1 outputs a high-level signal. The signal at the non-inverting input terminal of the second comparator Q2 is less than or equal to the signal at the inverting input terminal, and the second comparator Q2 outputs a low-level signal.

[0073] From the setting relationship of the aforementioned first resistor R1, it can be seen that when an abnormality occurs in the LED in the main lamp group 110, the current on the branch where it is located will decrease; if the LED is short-circuited, the current will drop to 0, and when the LED is short-circuited, the current will decrease; therefore, when the main lamp group 110 is normally lit, the current value on the first resistor R1 is relatively large, and the first end voltage of the first resistor R1 is also relatively large.

[0074] In this embodiment, the corresponding relationship between the lighting state of the main lamp group 110 and the output signals of the first comparator Q1 and the second comparator Q2 is:

[0075] When the main lamp group 110 emits light normally, the first comparator Q1 outputs a low level, and the second comparator Q2 outputs a high level;

[0076] When a small number of LEDs in the main lamp group 110 are short-circuited, the first comparator Q1 outputs a high level, and the second comparator Q2 outputs a high level;

[0077] When more LEDs in the main lamp group 110 are short-circuited or open-circuited, the first comparator Q1 outputs a high level, and the second comparator Q2 outputs a low level.

[0078] Furthermore, the reference voltage generating circuit 2121 includes a second resistor R2, a third resistor R3 and a fourth resistor R4; wherein:

[0079] The first end of the second resistor R2 is connected to the power supply, the second end of the second resistor R2 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded;

[0080] Among them, the second end of the second resistor R2 is connected to the non-inverting input terminal of the first comparator Q1 as the first output terminal of the reference voltage generating circuit 2121, and the second end of the third resistor R3 is connected to the non-inverting input terminal of the second comparator Q2 as the second output terminal of the reference voltage generating circuit 2121.

[0081] The second resistor R2, the third resistor R3, and the fourth resistor R4 constitute a voltage divider circuit; the voltage output by the power supply is first divided by the second resistor R2 and (the third resistor R3+the fourth resistor R4), and a first preset current signal is output at the second end of the second resistor R2; then, the voltage is divided by the third resistor R3 and the fourth resistor R4, and a second preset current signal is output at the second end of the third resistor R3.

[0082] It can be understood that, according to the voltage division principle, the voltage of the first preset current signal is greater than the voltage of the second preset current signal.

[0083] In this embodiment, the voltage divider circuit formed by the second resistor R2, the third resistor R3, and the fourth resistor R4 implements the output of multiple preset current signals.

[0084] In other embodiments, a main light group 110 and two backup light groups 120 may be provided in a main-backup light group 100, the number of LEDs in the backup light group 120 is half of that in the main light group 110, and the sum of the number of LEDs in the two backup light groups 120 is the same as that in the main light group 110; the two backup light groups 120 may both be arranged adjacent to the main light group 110, such as the two backup light groups 120 are arranged in a straight line, and the straight line is parallel to the main light group 110; correspondingly, the number of the second switch units 230 is two, and the second switch units 230 are connected to the backup light groups 120 one-to-one.

[0085] Based on the above description, in the above embodiment, three different states of the main light group 110 are defined; namely:

[0086] When the main lamp group 110 emits light normally, the first comparator Q1 outputs a low level, and the second comparator Q2 outputs a high level. At this time, the first switch unit 220 is turned on, and the second switch unit 230 is turned off. The main lamp group 110 works, and the standby lamp group 120 does not work.

[0087] When a small number of LEDs in the main lamp group 110 are short-circuited, the first comparator Q1 outputs a high level, and the second comparator Q2 outputs a high level. At this time, the first switch tube is turned on, and the second switch tube is turned on, and the main lamp group 110 and the backup lamp group 120 work at the same time;

[0088] When more LEDs in the main lamp group 110 are short-circuited or open-circuited, the first comparator Q1 outputs a high level and the second comparator Q2 outputs a low level. At this time, the first switch tube is turned off and the second switch tube is turned on. The main lamp group 110 does not work, and the backup lamp group 120 works.

[0089] It can be seen that in the two cases where the main lamp group 110 has problems, the backup lamp group 120 works, and the main lamp group 110 works when a small number of LEDs are short-circuited, and does not work when more LEDs are short-circuited or open-circuited; in these two cases, the number of LEDs that emit light is quite different, and there is a certain problem of excessive brightness; therefore, two backup lamp groups 120 are provided in this embodiment;

[0090] When a small number of LEDs in the main lamp group 110 are short-circuited, the main lamp group 110 works, and at the same time, the first backup lamp group 120 works, and the second backup lamp group 120 does not work; at this time, the first backup lamp group 120 containing half of the LEDs is used to supplement the brightness, and at the same time, the problem of excessive brightness supplement is avoided;

[0091] When more LEDs in the main lamp group 110 are short-circuited or open-circuited, the main lamp group 110 does not work, while the first backup lamp group 120 and the second backup lamp group 120 work at the same time. At this time, the lighting requirements of the position where the main backup lamp group 100 is located are guaranteed.

[0092] At the same time, the above method can also increase the service life of the spare lamp set 120.

[0093] The present invention provides a backlight module driving method, referring to Figure 4 , Figure 4 1 is a flow chart of a first embodiment of a backlight module driving method of the present invention. The backlight module driving method is applied to the backlight module driving circuit as described above. The method comprises the following steps:

[0094] Step S10, receiving the detection signal sent by the light group state detection unit, wherein the detection signal is generated by the light group state detection unit detecting the light emitting state of the main light group;

[0095] The light group state detection unit is used to detect the light emitting state of the main light group; the detection signal is used to reflect the actual light emitting state of the main light group.

[0096] It can be understood that when the lighting state of the main light group changes, the electrical signal on the branch where the main light group is located will also change; for example, when an LED in the main light group is short-circuited, since the LEDs in the main light group are connected in series, the branch where the main light group is located will be short-circuited and no current will be generated. Therefore, the lighting state of the main light group can be determined by detecting the signal.

[0097] Step S20, determining a target switch state of the first switch unit and the second switch unit according to the detection signal, and obtaining a switch signal corresponding to the target switch state;

[0098] The switching signal indicates adjustment of the switching states of the first switching unit and the second switching unit.

[0099] Step S30 , sending the switch signal to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their switch states based on the switch signal.

[0100] The control unit determines the lighting state of the main lamp group according to the detection signal, and further determines the target switching states of the first switch unit and the second switch unit based on the lighting state.

[0101] It can be understood that the first switch unit is connected in series with the main lamp group. Therefore, when the first switch unit is turned on, the branch where the main lamp group is located can form a loop through the first switch unit, that is, the main lamp group is set to work. When the first switch unit is turned off, the current loop of the branch where the main lamp group is located is disconnected by the first switch unit and cannot form a loop, that is, the main lamp group is set to be inoperative.

[0102] Similarly, the second switch unit is connected in series with the backup lamp group. Therefore, when the second switch unit is turned on, the circuit where the backup lamp group is located can form a loop through the second switch unit, that is, the backup lamp group is set to work; when the second switch unit is turned off, the current loop of the circuit where the backup lamp group is located is disconnected by the second switch unit and a loop cannot be formed, that is, the backup lamp group is set to not work.

[0103] It can be seen from the function of the aforementioned backup light group that the backup light group serves as a light supplement for the main light group; therefore, the working scenes of the main light group and the backup light group can be set based on actual needs, that is, the matching relationship between the detection signal and the first switch unit and the second switch unit is determined.

[0104] This embodiment detects the status of the main light group by setting a light group status detection unit to determine whether there is a display problem with the main light group. At the same time, an adjacent spare light group is set so that when there is a display problem with the main light group, the spare light group can compensate for the display of the main light group, thereby avoiding the problem of reduced brightness or uneven brightness display.

[0105] Furthermore, the step S20 includes:

[0106] Step S21, obtaining a first comparison signal and a second comparison signal in the detection signal, wherein the first comparison signal is output by a first comparator, and the second comparison signal is output by a second comparator;

[0107] Step S22, matching a target switch state corresponding to the first comparison signal and the second comparison signal.

[0108] In this embodiment, a first comparator and a second comparator are provided to realize the division of multiple states of the main light group.

[0109] It can be understood that the first comparator performs comparison based on the voltage V1 outputted from the first output terminal of the reference voltage generating circuit, and the second comparator performs comparison based on the voltage V2 outputted from the second output terminal of the reference voltage generating circuit, and V1 is greater than V2. Therefore, the current indication signal is compared by the first comparator and the second comparator, so that the current indication signal can be divided into different voltage intervals separated by V1 and V2, thereby determining the lighting state of the main lamp group, and then determining the target switch state that needs to be set for the first switch unit and the second switch unit.

[0110] Furthermore, the step S22 includes:

[0111] Step S221, determining whether the first comparison signal is at a low level;

[0112] Step S222: if the first comparison signal is at a low level, the target switch state of the first switch unit is on, and the target switch state of the second switch unit is off.

[0113] Step S223, if the first comparison signal is at a high level, determining whether the second comparison signal is at a high level;

[0114] Step S224, if the second comparison signal is at a high level, the target switch state of the first switch unit is on, and the target switch state of the second switch unit is on;

[0115] Step S225: if the second comparison signal is at a low level, the target switch state of the first switch unit is off, and the target switch state of the second switch unit is on.

[0116] When the current indication signal is greater than or equal to the voltage V1 outputted by the first output terminal of the reference voltage generating circuit, the signal at the non-inverting input terminal of the first comparator is less than the signal at the inverting input terminal, and the first comparator outputs a low-level signal, and the signal at the non-inverting input terminal of the second comparator is greater than the signal at the inverting input terminal, and the second comparator outputs a high-level signal;

[0117] When the current indication signal is less than V1 and greater than the voltage V2 output by the second output terminal of the reference voltage generating circuit, the signal at the non-inverting input terminal of the first comparator is greater than or equal to the signal at the inverting input terminal, the first comparator outputs a high-level signal, and the signal at the non-inverting input terminal of the second comparator is greater than the signal at the inverting input terminal, and the second comparator outputs a high-level signal;

[0118] When the current indication signal is less than or equal to the voltage V2 output by the second output terminal of the reference voltage generating circuit, the signal at the non-inverting input terminal of the first comparator is greater than or equal to the signal at the inverting input terminal, and the first comparator outputs a high-level signal. The signal at the non-inverting input terminal of the second comparator is less than or equal to the signal at the inverting input terminal, and the second comparator outputs a low-level signal.

[0119] From the setting relationship of the aforementioned first resistor, it can be seen that when an abnormality occurs in the LED in the main light group, the current on the branch where it is located will decrease; if the LED is short-circuited, the current will drop to 0, and when the LED is short-circuited, the current will decrease; therefore, when the main light group is lit normally, the current value on the first resistor is relatively large, and the voltage at the first end of the first resistor is also relatively large.

[0120] In this embodiment, the corresponding relationship between the lighting state of the main light group and the output signals of the first comparator and the second comparator is:

[0121] When the main light group is lighting normally, the first comparator outputs a low level and the second comparator outputs a high level. At this time, the first switch unit is turned on and the second switch unit is turned off. The main light group works and the standby light group does not work.

[0122] When a small number of LEDs in the main light group are short-circuited, the first comparator outputs a high level, and the second comparator outputs a high level. At this time, the first switch tube is turned on, and the second switch tube is turned on, and the main light group and the standby light group work at the same time;

[0123] When more LEDs in the main light group are short-circuited or open-circuited, the first comparator outputs a high level and the second comparator outputs a low level. At this time, the first switch tube is turned off and the second switch tube is turned on. The main light group does not work, and the standby light group works.

[0124] It should be noted that when a small number of LEDs in the main light group are short-circuited, although the brightness will be reduced, most of the LEDs in the main light group can still operate. Therefore, in order to improve the utilization rate of the main light group, at this time, the main light group is still used to emit light, and the spare light group is used to assist in the emission. When more LEDs in the main light group are short-circuited or open-circuited, the main light group cannot support good lighting and may also cause circuit damage. Therefore, the main light group is turned off and only the spare light group is used to emit light.

[0125] This embodiment can accurately determine the target switching states of the first switch unit and the second switch unit.

[0126] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0127] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0128] The present application also provides a control unit for implementing the above-mentioned backlight module driving method, the control unit comprising:

[0129] A first receiving module, used for receiving the detection signal sent by the light group state detection unit, wherein the detection signal is generated by the light group state detection unit by detecting the light emitting state of the main light group;

[0130] A first determining module, configured to determine a target switching state of the first switch unit and the second switch unit according to the detection signal, and obtain a switching signal corresponding to the target switching state;

[0131] The first sending module is used to send the switch signal to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their own switch states based on the switch signal.

[0132] By setting a light group status detection unit to detect the status of the main light group, it is determined whether there is a display problem with the main light group. At the same time, an adjacent spare light group is set so that when there is a display problem with the main light group, the spare light group can compensate for the display of the main light group, thereby avoiding the problem of reduced brightness or uneven brightness display.

[0133] It should be noted that the first receiving module in this embodiment can be used to execute step S10 in the embodiment of the present application, the first determining module in this embodiment can be used to execute step S20 in the embodiment of the present application, and the first sending module in this embodiment can be used to execute step S30 in the embodiment of the present application.

[0134] Furthermore, the first determining module includes:

[0135] A first acquisition unit, configured to acquire a first comparison signal and a second comparison signal in the detection signal, wherein the first comparison signal is output by a first comparator, and the second comparison signal is output by a second comparator;

[0136] The first matching unit is used to match the target switch state corresponding to the first comparison signal and the second comparison signal.

[0137] Furthermore, the first matching unit includes:

[0138] A first judging subunit, used to judge whether the first comparison signal is at a low level;

[0139] The first execution subunit is configured to, if the first comparison signal is at a low level, set the target switch state of the first switch unit to on and set the target switch state of the second switch unit to off.

[0140] Further, the first matching unit includes:

[0141] a second judging subunit, configured to judge whether the second comparing signal is at a high level if the first comparing signal is at a high level;

[0142] a second execution subunit, configured to, if the second comparison signal is at a high level, set the target switch state of the first switch unit to on and the target switch state of the second switch unit to on;

[0143] The third execution subunit is configured to, if the second comparison signal is at a low level, set the target switch state of the first switch unit to off and set the target switch state of the second switch unit to on.

[0144] The present invention also protects a display panel, which includes a backlight module driving circuit. The structure of the backlight module driving circuit can refer to the above embodiment and will not be described in detail here. As a matter of course, since the display panel of this embodiment adopts the technical solution of the backlight module driving circuit, the display panel has all the beneficial effects of the backlight module driving circuit.

[0145] In the present invention, the terms "first", "second", "third", "fourth" and "fifth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0146] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0147] Although the embodiments of the present invention have been shown and described above, the scope of protection of the present invention is not limited thereto. It is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art can change, modify and replace the above embodiments within the scope of the present invention, and these changes, modifications and replacements should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A backlight module driving circuit, characterized in that: The backlight module driving circuit includes multiple main and standby light groups and multiple light group driving modules, wherein the main and standby light groups are connected to the light group driving modules in a one-to-one correspondence; the main and standby light groups include a main light group and a standby light group that are adjacently arranged; the light group driving module includes a light group state detection unit, a first switch unit, a second switch unit and a control unit; the detection end of the light group state detection unit is connected to the main light group, the output end of the light group state detection unit is connected to the input end of the control unit, the output end of the control unit is connected to the control end of the first switch unit and the control end of the second switch unit, the first switch unit is connected in series with the main light group, and the second switch unit is connected in series with the standby light group; wherein: The light group state detection unit is used to detect the light emitting state of the main light group to generate a detection signal, and send the detection signal to the control unit; The control unit is used to receive the detection signal sent by the light group state detection unit, and determine the target switch state of the first switch unit and the second switch unit according to the detection signal, and send a switch signal corresponding to the target switch state to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their own switch state based on the switch signal.

2. The backlight module driving circuit according to claim 1, wherein: The lamp group state detection unit includes a current detection subunit and a comparison subunit; the detection end of the current detection subunit is connected to the main lamp group, the output end of the current detection subunit is connected to the input end of the comparison subunit, and the output end of the comparison subunit is connected to the input end of the control unit; wherein: The current detection subunit is used to detect the current on the branch where the main lamp group is located, obtain a current indication signal, and send the current indication signal to the comparison subunit; The comparison subunit is used to compare the current indication signal sent by the current detection subunit with a preset current signal to obtain the detection signal.

3. The backlight module driving circuit according to claim 2, wherein: The current detection subunit includes a first resistor; wherein: The first resistor is connected between the main lamp group and the ground, and one end of the first resistor connected to the main lamp group is connected to the input end of the comparison subunit as the output end of the current detection subunit.

4. The backlight module driving circuit according to claim 2, wherein: The comparison subunit includes a first comparator, a second comparator and a reference voltage generating circuit; wherein: The inverting input terminal of the first comparator is connected to the input terminal of the current detection subunit, the non-inverting input terminal of the first comparator is connected to the first output terminal of the reference voltage generating circuit, and the output terminal of the first comparator is connected to the first input terminal of the control unit as the first output terminal of the comparison subunit; The non-inverting input terminal of the second comparator is connected to the input terminal of the current detection subunit, the inverting input terminal of the second comparator is connected to the second output terminal of the reference voltage generating circuit, and the output terminal of the second comparator is connected to the second input terminal of the control unit as the second output terminal of the comparison subunit, wherein the voltage output by the first output terminal of the reference voltage generating circuit is greater than the voltage output by the second output terminal.

5. The backlight module driving circuit according to claim 4, characterized in that: The reference voltage generating circuit comprises a second resistor, a third resistor and a fourth resistor; wherein: The first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded; Among them, the second end of the second resistor is connected to the non-inverting input terminal of the first comparator as the first output terminal of the reference voltage generating circuit, and the second end of the third resistor is connected to the non-inverting input terminal of the second comparator as the second output terminal of the reference voltage generating circuit.

6. A backlight module driving method, characterized in that: The backlight module driving method is applied to the backlight module driving circuit according to any one of claims 1 to 5; The backlight module driving method comprises: Receiving the detection signal sent by the light group state detection unit, wherein the detection signal is generated by the light group state detection unit by detecting the light emitting state of the main light group; Determine the target switch state of the first switch unit and the second switch unit according to the detection signal, and obtain a switch signal corresponding to the target switch state; The switch signal is sent to the first switch unit and the second switch unit, so that the first switch unit and the second switch unit adjust their switch states based on the switch signal.

7. The backlight module driving method according to claim 6, wherein: The determining the target switch states of the first switch unit and the second switch unit according to the detection signal comprises: Acquire a first comparison signal and a second comparison signal in the detection signal, wherein the first comparison signal is output by a first comparator, and the second comparison signal is output by a second comparator; Matching target switch states corresponding to the first comparison signal and the second comparison signal.

8. The backlight module driving method according to claim 7, wherein: The matching of the target switch state corresponding to the first comparison signal and the second comparison signal includes: Determining whether the first comparison signal is at a low level; If the first comparison signal is at a low level, the target switch state of the first switch unit is on, and the target switch state of the second switch unit is off.

9. The backlight module driving method according to claim 8, wherein: The determining whether the first comparison signal is at a low level comprises: If the first comparison signal is at a high level, determining whether the second comparison signal is at a high level; If the second comparison signal is at a high level, the target switch state of the first switch unit is on, and the target switch state of the second switch unit is on; If the second comparison signal is at a low level, the target switch state of the first switch unit is off, and the target switch state of the second switch unit is on.

10. A display panel, characterized in that: The display panel includes the backlight module driving circuit according to any one of claims 1 to 5.

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