Monitoring device for a backlight module

Abstract

The application provides a monitoring device of a backlight module; the monitoring device of the backlight module judges whether a display abnormality occurs in a lamp area by detecting the driving chip in real time after the driving chip is initialized when the backlight module is turned on, and judges whether the driving chip is initialized for the first time when the display abnormality occurs in the lamp area; a forced detection signal can be sent to the driving chip when the driving chip is initialized for the first time, so that the backlight module is forced to detect. Since the backlight module has not entered a display stage at this time, the forced detection will not cause display flickering, thereby ensuring the specific position of the error of the lamp area and the display effect.

Description

Technical Field

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

[0002] Liquid crystal display devices are widely used due to their low power consumption, high clarity, long life, small size, and light weight. Liquid crystal display devices include a display panel and a backlight module. Display is achieved by emitting light from the light-emitting diodes on the backlight module. However, in actual use, due to defects in the process or design, the light-emitting diodes may display poorly or fail to display. In order to avoid loss of display information due to poor or inability to display light-emitting diodes in liquid crystal display devices, the backlight module is detected using real-time detection or forced detection to determine whether there is a problem with the display in the light area. However, real-time detection can only determine whether an error has occurred, but cannot identify the location of the problem. Although forced detection can determine the specific location, it will cause the screen to flicker during detection, affecting the display effect.

[0003] Therefore, the existing method for detecting the backlight module has the technical problem of being unable to simultaneously determine the specific location of the lamp area error and ensure the display effect. Summary of the Invention

[0004] The embodiment of the present application provides a monitoring device for a backlight module, which is used to solve the technical problem that the existing method for detecting the backlight module cannot simultaneously determine the specific location of the error in the light area and ensure the display effect.

[0005] An embodiment of the present application provides a monitoring device for a backlight module, comprising: a sending module for sending an initialization signal, initial data and a synchronization signal to a driver chip in the backlight module; a receiving module for receiving a real-time detection result returned by the driver chip; a judging module for judging whether the driver chip is initialized for the first time when the real-time detection result indicates that the light zone is abnormal; and a processing module for sending a forced detection signal to the driver chip when the driver chip is initialized for the first time, obtaining the forced detection result returned by the driver chip, determining first position information of the abnormally displayed light zone according to the forced detection result, obtaining a mapping table of the light zone layout and the light zone number, and determining second position information of the abnormally displayed light zone according to the first position information and the mapping table of the light zone layout and the light zone number.

[0006] In the above-mentioned backlight module monitoring device, the sending module is also used to: send an initialization signal to the driver chip to initialize the driver chip; after the initialization of the driver chip is completed, send the first initial data of each channel to the driver chip; and send a synchronization signal to the driver chip to make the first initial data of each channel of the driver chip effective.

[0007] In the monitoring device of the backlight module, the receiving module is further configured to send a real-time detection signal to the driving chip, wait for a predetermined number of synchronization periods, and receive a real-time detection result returned by the driving chip within the predetermined number of synchronization periods.

[0008] In the monitoring device of the backlight module, the receiving module is further configured to send a real-time detection signal to the driving chip, send luminance data in a first time period of a synchronization period, send a control signal and read data in a second time period of the synchronization period, and wait for a predetermined number of synchronization periods.

[0009] In the monitoring device of the backlight module, the judging module is further configured to determine whether the time is within a predetermined number of synchronization periods after initialization is started when the real-time detection result indicates that a light area is abnormal, and determine that the light area is abnormal and that the driving chip is initialized for the first time when the time is within the predetermined number of synchronization periods after initialization is started.

[0010] In the monitoring device of the backlight module, the processing module is further configured to send second initial data to the driving chip when the driving chip is initialized for the first time, send a synchronization signal to the driving chip to make the second initial data take effect, send a reset signal to the driving chip to make the driving chip pause scanning and display output, and send a forced detection signal to the driving chip and receive a forced detection result returned by the driving chip.

[0011] In the monitoring device of the backlight module, the second initial data includes data for turning off a feedback adjustment function of the driving chip and a detection voltage, and the detection voltage in the second initial data is greater than a detection voltage in real-time detection.

[0012] In the monitoring device of the backlight module, the processing module is further configured to send a short-circuit detection signal to the driving chip and receive a short-circuit detection result returned by the driving chip, send an open-circuit detection signal to the driving chip and receive an open-circuit detection result returned by the driving chip, and determine a forced detection result of the driving chip according to the short-circuit detection result and the open-circuit detection result.

[0013] In the monitoring device of the backlight module, the mapping table of the light area layout and the light area number includes a corresponding relationship between error information in the driving chip and the light area number, and the processing module is further configured to convert the driving chip error information in the first position information into a corresponding light area number according to the mapping table to obtain the second position information.

[0014] In the above-mentioned monitoring device for the backlight module, the processing module is further configured to send a shutdown output signal to the driver chip, so that the driver chip turns off the abnormally displayed light area.

[0015] Beneficial effect: The present application provides a monitoring device for a backlight module; the monitoring method for the backlight module sends an initialization signal to a driver chip in the backlight module after receiving a power-on instruction and powering on according to the power-on instruction, so that the driver chip is initialized, and then after the driver chip is initialized, the first initial data of each channel is sent to the driver chip, and then a synchronization signal is sent to the driver chip to make the first initial data of each channel of the driver chip effective, and then a real-time detection signal is sent to the driver chip, and the real-time detection result returned by the driver chip is received. When the real-time detection result indicates that the light area is abnormal, it is determined whether the driver chip is initialized for the first time. When the driver chip is initialized for the first time, a forced detection signal is sent to the driver chip. The present application performs real-time detection on the driver chip when the backlight module is powered on and after the driver chip is initialized to determine whether a display abnormality occurs in the light area. When a display abnormality occurs in the light area, it is determined whether the driver chip is initialized for the first time. When the driver chip is initialized for the first time, a forced detection signal can be sent to the driver chip to force the backlight module to perform forced detection. Since the backlight module has not entered the display stage at this time, forced detection will not cause flickering during display, thereby taking into account both determining the specific location of the error in the light area and ensuring the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0017] Figure 1 This is a flow chart of a backlight module monitoring method provided in an embodiment of the present application.

[0018] Figure 2 This is a structural diagram of the backlight module provided in an embodiment of the present application.

[0019] Figure 3 A timing diagram of the signal lines provided in an embodiment of the present application.

[0020] Figure 4 This is a timing diagram of the various signal lines in different stages of the backlight module monitoring method provided in an embodiment of the present application.

[0021] Figure 5 A schematic diagram of a monitoring device for a backlight module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0025] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0026] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0027] The embodiments of the present application provide a backlight module monitoring method and monitoring device to solve the technical problem that the existing method for detecting the backlight module cannot simultaneously determine the specific location of the light area error and ensure the display effect.

[0028] like Figure 1 As shown, an embodiment of the present application provides a method for monitoring a backlight module, and the method for monitoring a backlight module includes:

[0029] S1, receiving a power-on instruction, and performing power-on according to the power-on instruction.

[0030] Specifically, when monitoring the backlight module, it is necessary to first put the backlight module into a power-on initial state so that each module starts working. Then, a power-on instruction can be sent to each module so that each module is powered on according to the power-on instruction.

[0031] Specifically, the power-on instruction can be sent through a variety of methods such as touch screen click, voice control, mouse click, etc. After the backlight module receives the power-on instruction, it is powered on according to the power-on instruction.

[0032] Specifically, such as Figure 2 As shown, the backlight module includes a power module DC-DC, a microcontroller unit MCU, and a driver chip LED Driver. After the backlight module receives a power-on command, the power module DC-DC, microcontroller unit MCU, and driver chip LED Driver in the backlight module are powered on according to the power-on command. The power module DC-DC can output a signal to the driver chip LED Driver through the output port Vout. The power signal terminal Vled is connected to the power signal terminal Vled of the driver chip, and the power signal terminal Vled is connected to the first resistor R1 and the second resistor R2. The power signal can be input to the driver chip through the power module DC-DC, thereby initializing the backlight module. Feedback can also be provided through the feedback port feedback to avoid output instability.

[0033] In one embodiment, the micro control unit receives a power-on instruction and powers on according to the power-on instruction, so that the micro control unit can send and receive signals after powering on to monitor the backlight module.

[0034] S2, after power-on, sending an initialization signal to the driver chip in the backlight module to initialize the driver chip.

[0035] Specifically, when monitoring the backlight module, the driver chip needs to be initialized first to prevent an unstable state at power-on from affecting the detection result. Therefore, an initialization signal can be sent to the driver chip to initialize the driver chip.

[0036] Specifically, the microcontroller unit may send an initialization signal to the driver chip in the backlight module, so that the driver chip turns off the real-time detection function during initialization, thereby preventing the unstable state at power-on from affecting the detection result.

[0037] like Figure 2 As shown, the microcontroller unit MCU can complete the initialization of the driver chip through the SPI (Serial Peripheral Interface). The SPI includes a clock line SCK, an enable line CSB, a data input line SDI, and a data output line SDO. The SPI controls the internal registers of the driver chip LED Driver to disable the detection function of the driver chip LED Driver, preventing the unstable state at power-on from affecting the detection results.

[0038] S3, after the driver chip is initialized, sending first initialization data of each channel to the driver chip.

[0039] In one embodiment, after the driver chip completes initialization, first initialization data may be sent to each channel so that the lamp connected to the driver chip can be lit and the lamp zone can be controlled.

[0040] Specifically, the first initialization data is a voltage value, which is determined by the initial brightness of different backlight modules and is not limited to a specific value.

[0041] Specifically, such as Figure 2 As shown in the figure, 6 light sources are shown, which are labeled D1, D2, D3, D4, D5 and D6 respectively. Scan signals are output to each row light source through scan signal channels SW1, SW2 to SWm, and data signals are output to each column light source through data signal channels OUT1 to OUTn, so that each light source can have an initial brightness and the light area can be controlled.

[0042] Specifically, each light source can output the same data signal, so that the brightness of each light source is consistent, and thus the area and light source with problems can be easily found when monitoring the backlight module.

[0043] S4, sending a synchronization signal to the driving chip, so that the first initialization data of each channel of the driving chip takes effect.

[0044] Specifically, as shown in Figure 2 The synchronization signal can be sent through the synchronization signal line Vsync, so that the first initialization data of each channel of the driving chip can take effect, and thus the light source can be turned on.

[0045] S5, sending a real-time detection signal to the driving chip and receiving a real-time detection result returned by the driving chip.

[0046] In an embodiment, after the initialization of the driving chip is completed and the light source is turned on, the real-time detection signal is sent to the driving chip, and the real-time detection result returned by the driving chip is received, so that the real-time detection result can be processed, and the specific position of the error of the light area and the display effect can be ensured.

[0047] In order to solve the problem that the error detected in the real-time detection process may be detected for too short a time and may lead to false detection, in an embodiment, the step of sending a real-time detection signal to the driving chip and receiving a real-time detection result returned by the driving chip includes: sending a real-time detection signal to the driving chip and waiting for 10 synchronization periods; and receiving the real-time detection result returned by the driving chip within 10 synchronization periods. By waiting for 10 synchronization periods after sending the real-time detection signal to the driving chip, the false detection can be avoided when the light area is detected in real time, so that the real-time detection result is accurate.

[0048] Specifically, the real-time detection process needs to detect an error for 8 consecutive synchronization periods to determine the error, therefore, in order to avoid false detection, the application waits for 10 synchronization periods, and the real-time detection result returned by the driving chip is received within 10 synchronization periods, so that the real-time detection result is accurate.

[0049] It should be noted that the above embodiment is described in detail by taking 10 synchronization periods as an example, but the embodiment of the application is not limited thereto, for example, 8 synchronization periods or 11 synchronization periods can be waited.

[0050] In order to solve the problem that the real-time detection of the driving chip needs to wait for multiple synchronization periods, resulting in a long time consumption. In an embodiment, the step of sending a real-time detection signal to the driving chip and waiting for 10 synchronization periods comprises: sending a real-time detection signal to the driving chip, sending brightness data in a first time period of a synchronization period, and sending a control signal and reading data in a second time period of a synchronization period; and waiting for 10 synchronization periods. By sending brightness data in a first time period of a synchronization period and sending a control signal and reading data in a second time period of a synchronization period, the time for initialization can be reduced, the problem that the initialization time is too long to cause the display to be turned on for a long time and affect the user experience can be avoided, and the process can avoid the conflict of the control authority of SPI caused by different operations.

[0051] Specifically, as shown in Figure 3 the time period of the synchronization signal line Vsync output signal is divided into a first time period 301 and a second time period 302, the control signal and the reading data are sent at the falling edge, that is, the SPI sends the control signal and the reading data in the control time zone 31, and the SPI sends the brightness data in the brightness time zone 32, so that the initialization process of the backlight module can be reduced, the problem that the initialization time is too long to cause the display to be turned on for a long time and affect the user experience can be avoided, and the process can avoid the conflict of the control authority of SPI caused by different operations.

[0052] S6, when the real-time detection result represents a lamp area abnormality, determining whether the driving chip is initialized for the first time.

[0053] In an embodiment, when the driving chip performs real-time detection, a real-time detection result is returned, and the real-time detection result is returned to the micro control unit, so that the micro control unit performs corresponding processing.

[0054] Specifically, as shown in Figure 2 the data returned through the error return line fail back can be used to determine the representation of the real-time detection result, for example, if the fail back returns a low potential, the real-time detection result represents a lamp area abnormality, and if the fail back returns a high potential, the real-time detection result represents a lamp area normality, so that the micro control unit can perform corresponding processing according to the returned potential.

[0055] In one embodiment, when the real-time detection result indicates that the lamp area is abnormal, the step of determining whether the driver chip is initialized for the first time includes: when the real-time detection result indicates that the lamp area is abnormal, determining whether it is within 10 synchronization cycles after initialization is turned on; when the time is within 10 synchronization cycles after initialization is turned on, determining that the lamp area is abnormal and determining whether the driver chip is initialized for the first time. When the real-time detection result indicates that the lamp area is abnormal, determining whether it is within 10 synchronization cycles after initialization is turned on, if the time is within 10 synchronization cycles after initialization is turned on, it can be determined that it is the first initialization; if the time is not within 10 synchronization cycles after initialization is turned on, it can be determined that it is not the first initialization, so that the microcontroller unit can handle it accordingly.

[0056] S7: When the driver chip is initialized for the first time, a forced detection signal is sent to the driver chip.

[0057] In one embodiment, to address the problem that the current forced detection may cause display flickering, the embodiment of the present application determines whether the driver chip is initialized for the first time, and sends a forced detection signal to the driver chip when the driver chip is initialized for the first time, so that the driver chip can perform forced detection, thereby determining the specific location of the error. Since this stage is the initialization stage, it will not affect the flickering of the display, thereby improving the display effect.

[0058] In one embodiment, when the driver chip is initialized for the first time, sending a forced detection signal to the driver chip includes: sending second initial data to the driver chip when the driver chip is initialized for the first time; sending a synchronization signal to the driver chip to make the second initial data effective; sending a reset signal to the driver chip to cause the driver chip to suspend scanning and display output; sending a forced detection signal to the driver chip, and receiving the forced detection result returned by the driver chip. When sending the forced detection signal to the driver chip, it is necessary to first adjust the state during forced detection. Therefore, the second initial data is first sent to the driver chip to cause the driver chip to change the detection adjustment, and then a reset signal is sent to the driver chip to suspend scanning and display output, causing the driver chip to perform forced detection of the row and column scanning rhythm and brightness. Then, the driver chip performs forced detection, and receives the forced detection result returned by the driver chip. In this way, the specific location of the light area where the backlight module has an error can be determined, and since it is in the initialization stage, flickering will not occur during display.

[0059] Specifically, the second initial data includes data for disabling the feedback regulation function of the driver chip and a detection voltage, and the detection voltage in the second initial data is greater than the detection voltage during real-time detection. This disables the feedback regulation function of the driver chip and increases the detection voltage to facilitate forced detection.

[0060] Specifically, by sending a reset signal to the driver chip so that the driver chip suspends scanning and display output, it is possible to avoid the normal display from affecting the forced detection result, thereby ensuring that the forced detection result is accurate.

[0061] In one embodiment, the step of sending a forced detection signal to the driver chip and receiving the forced detection result returned by the driver chip includes: sending a short circuit detection signal to the driver chip and receiving the short circuit detection result returned by the driver chip; sending an open circuit detection signal to the driver chip and receiving the open circuit detection result returned by the driver chip; and determining the forced detection result of the driver chip based on the short circuit detection result and the open circuit detection result. By sending a short circuit detection signal to the driver chip, short circuit detection can be performed on the lamp area, and by sending an open circuit detection signal to the driver chip, open circuit detection can be performed on the lamp area. The location of the error and the type of problem can be determined through short circuit detection and open circuit detection, making it easier to repair the area with the problem or avoid the area with the problem, so that the location of the error can be prevented from having a significant impact on the display screen during display.

[0062] Specifically, when displaying, determining the location of the error can make the key data or key screen displayed at other locations, avoiding the loss of key data or key screen due to the inability to display the error location, and determining the location of the error can facilitate subsequent repair of the backlight module.

[0063] Specifically, before sending the short circuit detection signal to the driver chip, a wait time of 4 milliseconds may be maintained until the display output stops, so as to prevent the display output from affecting the detection result.

[0064] Specifically, when the driver chip performs short circuit detection, the short circuit detection can be performed for 40 microseconds to accurately find the area where the problem occurs.

[0065] Specifically, before sending the open circuit detection signal to the driver chip, you can wait for 1 millisecond to wait for the short circuit detection result to be sent, so as to avoid the short circuit detection result sending process affecting the open circuit detection.

[0066] Specifically, when the driver chip performs open circuit detection, the open circuit detection can be performed for 40 microseconds to accurately find the area where the problem occurs.

[0067] The error location information obtained using the above method is only the defined layout of the driver chip, and it is not possible to intuitively determine the location information where the error occurred. In one embodiment, after sending a forced detection signal to the driver chip and receiving the forced detection result returned by the driver chip, the method further includes: determining the first location information of the abnormally displayed light zone based on the forced detection result; obtaining a mapping table of light zone layouts and light zone numbers; and determining the second location information of the abnormally displayed light zone based on the first location information and the mapping table of light zone layouts and light zone numbers. By obtaining the mapping table of light zone layouts and light zone numbers, the first location information can be converted into the second location information, thereby intuitively determining the location information where the error occurred, facilitating subsequent processing.

[0068] Specifically, as shown in Table 1 below, taking the error information distribution table of a certain driver chip as an example, Register address in the table indicates the address of the register, Register name indicates the name of the information in the register, R / W indicates read and write permissions, Default indicates the default state, 0xD03 to 0xD0E are addresses expressed in hexadecimal, SCAN1 open / short error detection result of channel 49 to channel 33 indicates the open / short circuit detection results of channels 33 to 48 of the first scan line. Similarly, other columns indicate the open / short circuit detection results of different channels of different scan lines. R indicates that the register can only be read. In the Default column, when no error occurs, all registers are 1. After an error occurs, the corresponding register will become 0.

[0069] Table 1 Driver chip error message distribution table

[0070]

[0071]

[0072] As shown in Table 2 below, Table 2 is a light zone layout table. In the table, scan1 is the first scan line, scan2 is the second scan line, scan3 is the third scan line, and scan4 is the fourth scan line, corresponding to SCAN1 to SCAN4 in Table 1. ch1 in Table 2 refers to channel 1 in Table 1. Similarly, ch2 to ch48 refer to channels 2 to 48 in Table 1.

[0073] Table 2 Lighting Zone Layout

[0074] 1 2 3 4 5 6 7 8 9 10 11 12 scan1 scan2 scan3 scan4 scan1 scan2 scan3 scan4 scan1 scan2 scan3 scan4 1 ch1 ch1 ch1 ch1 ch17 ch17 ch17 ch17 ch33 ch33 ch33 ch33 2 ch2 ch2 ch2 ch2 ch18 ch18 ch18 ch18 ch34 ch34 ch34 ch34 3 ch3 ch3 ch3 ch3 ch19 ch19 ch19 ch19 ch35 ch35 ch35 ch35 4 ch4 ch4 ch4 ch4 ch20 ch20 ch20 ch20 ch36 ch36 ch36 ch36 5 ch5 ch5 ch5 ch5 ch21 ch21 ch21 ch21 ch37 ch37 ch37 ch37 6 ch6 ch6 ch6 ch6 ch22 ch22 ch22 ch22 ch38 ch38 ch38 ch38 7 ch7 ch7 ch7 ch7 ch23 ch23 ch23 ch23 ch39 ch39 ch39 ch39 8 ch8 ch8 ch8 ch8 ch24 ch24 ch24 ch24 ch40 ch40 ch40 ch40 9 ch9 ch9 ch9 ch9 ch25 ch25 ch25 ch25 ch41 ch41 ch41 ch41 10 ch10 ch10 ch10 ch10 ch26 ch26 ch26 ch26 ch42 ch42 ch42 ch42 11 ch11 ch11 ch11 ch11 ch27 ch27 ch27 ch27 ch43 ch43 ch43 ch43 12 ch12 ch12 ch12 ch12 ch28 ch28 ch28 ch28 ch44 ch44 ch44 ch44 13 ch13 ch13 ch13 ch13 ch29 ch29 ch29 ch29 ch45 ch45 ch45 ch45 14 ch14 ch14 ch14 ch14 ch30 ch30 ch30 ch30 ch46 ch46 ch46 ch46 15 ch15 ch15 ch15 ch15 ch31 ch31 ch31 ch31 ch47 ch47 ch47 ch47 16 ch16 ch16 ch16 ch16 ch32 ch32 ch32 ch32 ch48 ch48 ch48 ch48

[0075] As shown in Table 3, Table 3 is a lamp area number table, the first row in Table 3 corresponds to the first row in Table 2, the first column in Table 3 corresponds to the first column in Table 2, and the numbers 1 to 192 in the table represent lamp area numbers.

[0076] Table 3 Lamp Area Number Table

[0077]

[0078]

[0079] Specifically, in order to arrange the error information in the driving chip in the order of Table 3, an embodiment of the present application can set a cache area with address coding, the bit width of the cache area is greater than or equal to 1 bit, the depth of the cache area is greater than or equal to 192, and considering the two error states of open circuit and short circuit, there can be two cache areas of the same size, the corresponding number is determined according to the error information in the driving chip, so as to determine the address of writing in the cache area.

[0080] Specifically, taking the error information in the driving chip as the information in Table 1 as an example, according to Table 2 and Table 3, it can be known that the 0th bit (a total of 16 bits, coded as 0 to 15) of the first data read should be the correct lamp area number 9, and then the bit data should be re-written to the 9th address space of the cache area. In this way, the mapping table shown in Table 4 can be obtained.

[0081] Table 4 Mapping Table of Lamp Area Layout and Lamp Area Number

[0082] 1 2 3 4 5 6 7 8 9 10 11 12 1 9 5 1 10 6 2 11 7 3 12 8 4 2 21 17 13 22 18 14 23 19 15 24 20 16 3 33 29 25 34 30 26 35 31 27 36 32 28 4 45 41 37 46 42 38 47 43 39 48 44 40 5 57 53 49 58 54 50 59 55 51 60 56 52 6 69 65 61 70 66 62 71 67 63 72 68 64 7 81 77 73 82 78 74 83 79 75 84 80 76 8 93 89 85 94 90 86 95 91 87 96 92 88 9 105 101 97 106 102 98 107 103 99 108 104 100 10 117 113 109 118 114 110 119 115 111 120 116 112 11 129 125 121 130 126 122 131 127 123 132 128 124 12 141 137 133 142 138 134 143 139 135 144 140 136 13 153 149 145 154 150 146 155 151 147 156 152 148 14 165 161 157 166 162 158 167 163 159 168 164 160 15 177 173 169 178 174 170 179 175 171 180 176 172 16 189 185 181 190 186 182 191 187 183 192 188 184

[0083] From Table 1 to Table 4, it can be seen that the mapping table of lamp area layout and lamp area number can be determined according to the lamp area layout table and the lamp area number table. When the first position information of the abnormally displayed lamp area is obtained, for example, the first column in the error information distribution table of the driving chip appears an error, that is, the open circuit / short circuit detection results of channels 33 to 48 of the first scanning line are abnormally displayed, and taking Table 4 as an example, the second position information is the position information of the light sources numbered 9, 21, 33, 45, 57, 69, 81, 93, 105, 117, 129, 141, 153, 165, 177 and 189. Therefore, the position information of the error can be directly observed.

[0084] In an embodiment, after the step of sending a forced detection signal to the driving chip and receiving the forced detection result returned by the driving chip, the method further comprises: sending a closing output signal to the driving chip to close the abnormally displayed lamp area. After the forced detection determines the position of the error, in order to avoid repeated detection of errors, the abnormally displayed lamp area can be closed, thereby avoiding repeated detection of errors.

[0085] Specifically, after the forced detection determines the location where the error occurs, the fail back state of the error return line may be cleared to avoid affecting subsequent detections.

[0086] In one embodiment, the step of sending a forced detection signal to the driver chip when the driver chip is initialized for the first time further includes: reporting the real-time detection result when the driver chip is not initialized for the first time; receiving a processing signal returned by the client; sending a forced detection signal to the driver chip when the processing signal indicates forced detection; and re-performing real-time detection when the processing signal indicates a real-time detection result that clears abnormalities in the light zone. By sending the real-time detection result to the client for processing when the driver chip is not initialized for the first time, sending a forced detection signal to the driver chip when the processing signal returned by the client indicates forced detection; and re-performing real-time detection when the processing signal indicates a real-time detection result that clears abnormalities in the light zone, the user experience can be improved and sudden screen flickering that affects the user experience can be avoided.

[0087] Specifically, when the processing signal is characterized by forced detection, a forced detection signal is sent to the driver chip; when the processing signal is characterized by clearing the real-time detection result of the abnormality of the lamp area, the step of re-performing real-time detection can also be performed when the processing signal is characterized by no processing.

[0088] like Figure 4 As shown, Figure 4 (a) is a timing diagram of each signal line during detection of the backlight module monitoring method of the embodiment of the present application. Figure 4 (b) is a timing diagram of various signals of the backlight module monitoring method provided by an embodiment of the present application when no detection is performed.

[0089] An embodiment of the present application provides a method for monitoring a backlight module. The method for monitoring the backlight module performs real-time detection on the driver chip after the driver chip is initialized when the backlight module is powered on to determine whether a display abnormality occurs in the lamp area. When a display abnormality occurs in the lamp area, it is determined whether the driver chip is initialized for the first time. When the driver chip is initialized for the first time, a forced detection signal can be sent to the driver chip to force the backlight module to perform forced detection. Since the backlight module has not entered the display stage at this time, forced detection will not cause flickering during display, thereby taking into account both determining the specific location of the error in the lamp area and ensuring the display effect.

[0090] At the same time, if Figure 5 As shown, an embodiment of the present application provides a monitoring device for a backlight module, the monitoring device for the backlight module comprising:

[0091] A first receiving module 401 is configured to receive a power-on instruction and perform power-on according to the power-on instruction;

[0092] A first sending module 402 is used to send an initialization signal to the driver chip in the backlight module after power-on, so as to initialize the driver chip;

[0093] A second sending module 403 is configured to send first initial data of each channel to the driver chip after the driver chip is initialized;

[0094] A third sending module 404 is configured to send a synchronization signal to the driver chip to enable the first initial data of each channel of the driver chip to take effect;

[0095] The second receiving module 405 is used to send a real-time detection signal to the driver chip and receive a real-time detection result returned by the driver chip;

[0096] A judgment module 406 is configured to judge whether the driver chip is initialized for the first time when the real-time detection result indicates that the lamp area is abnormal;

[0097] The processing module 407 is configured to send a forced detection signal to the driver chip when the driver chip is initialized for the first time.

[0098] In one embodiment, the second receiving module is configured to send a real-time detection signal to the driver chip and wait for 10 synchronization cycles; and receive the real-time detection result returned by the driver chip within the 10 synchronization cycles.

[0099] In one embodiment, the second receiving module is used to send a real-time detection signal to the driver chip, and send brightness data in a first time period of the synchronization cycle, and send a control signal and read data in a second time period of the synchronization cycle; and wait for 10 synchronization cycles.

[0100] In one embodiment, the judgment module is used to determine whether the real-time detection result is characterized as a lamp zone abnormality within 10 synchronization cycles after initialization. When the time is within 10 synchronization cycles after initialization, it is determined that the lamp zone is abnormal and whether the driver chip is initialized for the first time.

[0101] In one embodiment, the processing module is used to send second initial data to the driver chip when the driver chip is initialized for the first time; send a synchronization signal to the driver chip to make the second initial data effective; send a reset signal to the driver chip to cause the driver chip to suspend scanning and display output; send a forced detection signal to the driver chip, and receive a forced detection result returned by the driver chip.

[0102] In one embodiment, the processing module is used to send a short circuit detection signal to the driver chip and receive a short circuit detection result returned by the driver chip; send an open circuit detection signal to the driver chip and receive an open circuit detection result returned by the driver chip; and determine a forced detection result of the driver chip based on the short circuit detection result and the open circuit detection result.

[0103] In one embodiment, the processing module is also used to determine the first position information of the abnormally displayed light area based on the forced detection result; obtain a mapping table of the light area layout and the light area number; and determine the second position information of the abnormally displayed light area based on the first position information and the mapping table of the light area layout and the light area number.

[0104] In one embodiment, the processing module is further configured to send a shutdown output signal to the driver chip, so that the driver chip turns off the abnormally displayed light area.

[0105] In one embodiment, the processing module is also used to report the real-time detection result when the driver chip is not initialized for the first time; receive a processing signal returned by the client; send a forced detection signal to the driver chip when the processing signal is characterized by forced detection; and re-perform real-time detection when the processing signal is characterized by a real-time detection result that clears the abnormality of the light area.

[0106] An embodiment of the present application provides a monitoring device for a backlight module. The monitoring device for the backlight module performs real-time detection on the driver chip after the driver chip is initialized when the backlight module is powered on, so as to determine whether a display abnormality occurs in the lamp area. When a display abnormality occurs in the lamp area, it is determined whether the driver chip is initialized for the first time. When the driver chip is initialized for the first time, a forced detection signal can be sent to the driver chip to force the backlight module to perform forced detection. Since the backlight module has not entered the display stage at this time, the forced detection will not cause flickering during display, thereby taking into account both determining the specific location of the error in the lamp area and ensuring the display effect.

[0107] At the same time, an embodiment of the present application also provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps in the above-mentioned backlight module monitoring method when executing the program.

[0108] At the same time, an embodiment of the present application further provides a computer-readable storage medium, in which a plurality of instructions are stored. The instructions are suitable for loading by a processor to execute the steps in the above-mentioned backlight module monitoring method.

[0109] According to the above embodiments, it can be seen that:

[0110] An embodiment of the present application provides a monitoring method and a monitoring device for a backlight module; the monitoring method for the backlight module sends an initialization signal to a driver chip in the backlight module after receiving a power-on instruction and powering on according to the power-on instruction, so that the driver chip is initialized, and then after the driver chip is initialized, sends the first initial data of each channel to the driver chip, and then sends a synchronization signal to the driver chip to make the first initial data of each channel of the driver chip effective, and then sends a real-time detection signal to the driver chip, and receives the real-time detection result returned by the driver chip. When the real-time detection result indicates that the light area is abnormal, it is determined whether the driver chip is initialized for the first time. When the driver chip is initialized for the first time, a forced detection signal is sent to the driver chip. The present application performs real-time detection on the driver chip when the backlight module is powered on and after the driver chip is initialized to determine whether a display abnormality occurs in the light area. When a display abnormality occurs in the light area, it is determined whether the driver chip is initialized for the first time. When the driver chip is initialized for the first time, a forced detection signal can be sent to the driver chip to force the backlight module to perform forced detection. Since the backlight module has not entered the display stage at this time, forced detection will not cause flickering during display, thereby taking into account both determining the specific location of the error in the light area and ensuring the display effect.

[0111] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0112] The above is a detailed introduction to a backlight module monitoring method and monitoring device provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A monitoring device for a backlight module, characterized in that: include: A sending module, used to send an initialization signal, initial data and synchronization signal to the driver chip in the backlight module; A receiving module, configured to receive the real-time detection results returned by the driver chip; a judgment module, configured to judge whether the driver chip is initialized for the first time when the real-time detection result indicates that the lamp area is abnormal; as well as A processing module is used to send a forced detection signal to the driver chip when the driver chip is initialized for the first time, obtain the forced detection result returned by the driver chip, determine the first position information of the abnormally displayed light area based on the forced detection result, obtain a mapping table of the light area layout and the light area number, and determine the second position information of the abnormally displayed light area based on the first position information and the mapping table of the light area layout and the light area number.

2. The backlight module monitoring device according to claim 1, wherein: The sending module is further used for: Sending an initialization signal to the driver chip to initialize the driver chip; After the driver chip is initialized, first initial data of each channel is sent to the driver chip; as well as A synchronization signal is sent to the driver chip to enable first initial data of each channel of the driver chip to take effect.

3. The backlight module monitoring device according to claim 1, wherein: The receiving module is further configured to: Sending a real-time detection signal to the driver chip and waiting for a predetermined number of synchronization cycles; and The real-time detection result returned by the driving chip is received within a predetermined number of synchronization cycles.

4. The backlight module monitoring device according to claim 3, wherein: The receiving module is further configured to: Sending a real-time detection signal to the driver chip; Sending brightness data in a first time period of a synchronization cycle; sending a control signal and reading data during a second time period of the synchronization cycle; as well as Wait for a predetermined number of synchronization cycles.

5. The backlight module monitoring device according to claim 1, wherein: The judgment module is also used for: When the real-time detection result indicates that the light zone is abnormal, determining whether it is within a predetermined number of synchronization cycles after initialization; and When the time is within a predetermined number of synchronization cycles after the initialization start, it is determined that the lamp area is abnormal, and it is determined whether the driving chip is initialized for the first time.

6. The backlight module monitoring device according to claim 1, wherein: The processing module is further configured to: When the driver chip is initialized for the first time, sending second initial data to the driver chip; sending a synchronization signal to the driver chip to make the second initial data effective; Sending a reset signal to the driver chip to cause the driver chip to suspend scanning and display output; as well as A forced detection signal is sent to the driver chip, and a forced detection result returned by the driver chip is received.

7. The backlight module monitoring device according to claim 6, wherein: The second initial data includes data for disabling the feedback regulation function of the driver chip and a detection voltage, and the detection voltage in the second initial data is greater than the detection voltage during real-time detection.

8. The backlight module monitoring device according to claim 6, wherein: The processing module is further configured to: Sending a short circuit detection signal to the driver chip and receiving a short circuit detection result returned by the driver chip; sending an open circuit detection signal to the driver chip, and receiving an open circuit detection result returned by the driver chip; and A forced detection result of the driver chip is determined according to the short circuit detection result and the open circuit detection result.

9. The backlight module monitoring device according to claim 1, wherein: The mapping table of the light zone layout and the light zone number includes the correspondence between the error information in the driver chip and the light zone number. The processing module is also used to convert the driver chip error information in the first position information into the corresponding light zone number according to the mapping table to obtain the second position information.

10. The backlight module monitoring device according to claim 1, wherein: The processing module is further configured to send a shutdown output signal to the driver chip, so that the driver chip turns off the abnormally displayed light area.

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