Monitoring device of backlight module

Abstract

The invention provides a monitoring device of a backlight module. According to the monitoring device of the backlight module, when the backlight module is powered on and started, after the driving chip is initialized, the driving chip is detected in real time so as to judge whether the display of the lamp area is abnormal or not, when the display of the lamp area is abnormal, whether the driving chip is initialized for the first time or not is judged, and when the driving chip is initialized for the first time, the driving chip is initialized for the second time. The forced detection signal is sent to the driving chip, so that the backlight module performs forced detection, and the backlight module does not enter the display stage at the moment, so that the problem of flickering during display during forced detection is avoided, and the specific position of the error of the lamp area is determined and the display effect is ensured.

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 definition, long life, small size, and light weight. Liquid crystal display devices include display panels and backlight modules. Display is achieved through the light-emitting diodes on the backlight module. However, in actual processes, due to defects in 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 failed light-emitting diode display in liquid crystal display devices, the backlight module is detected by 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 light zone 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 take into account both determining the specific location of the error in the light area and ensuring the display effect.

[0005] An embodiment of the present application provides a monitoring device for a backlight module, comprising: a sending module, used to send an initialization signal, initial data and a synchronization signal to a driver chip in the backlight module; a receiving module, used to receive a real-time detection result returned by the driver chip; a judgment module, used to judge 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, 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 zone according to the forced detection result, obtain a mapping table of the light zone layout and the light zone number, and determine the 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 driver chip is initialized, 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 above-mentioned backlight module monitoring device, the receiving module is further used for: sending a real-time detection signal to the driving chip and waiting for a predetermined number of synchronization cycles; and receiving the real-time detection result returned by the driving chip within the predetermined number of synchronization cycles.

[0008] In the above-mentioned backlight module monitoring device, the receiving module is also used to: send a real-time detection signal to the driving chip; send brightness data in the first time period of the synchronization cycle; send a control signal and read data in the second time period of the synchronization cycle; and wait for a predetermined number of synchronization cycles.

[0009] In the above-mentioned backlight module monitoring device, the judgment module is also used for: when the real-time detection result is characterized as an abnormality in the light zone, judging 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 initialization, determining that the light zone is abnormal, and judging whether the driver chip is initialized for the first time.

[0010] In the above-mentioned backlight module monitoring device, the processing module is also 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 make the driver chip suspend scanning and display output; and send a forced detection signal to the driver chip and receive the forced detection result returned by the driver chip.

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

[0012] In the above-mentioned backlight module monitoring device, the processing module is also used to: send a short circuit detection signal to the driver chip and receive the short circuit detection result returned by the driver chip; send an open circuit detection signal to the driver chip and receive the open circuit detection result returned by the driver chip; and determine the forced detection result of the driver chip based on the short circuit detection result and the open circuit detection result.

[0013] In the above-mentioned backlight module monitoring device, 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, and 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.

[0014] In the above-mentioned monitoring device for the backlight module, the processing module is further used to send a shutdown output signal to the driving chip, so that the driving 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, and 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 determines 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 technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

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

[0018] Figure 2 A schematic diagram of the structure of the backlight module provided in an embodiment of the present application.

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

[0020] Figure 4 This is a timing diagram of each signal line 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 technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

[0026] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can 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 a monitoring device, which are used to solve the technical problem that the existing method for detecting the backlight module cannot take into account both determining the specific location of the error in the light area and ensuring 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 may 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, the backlight module is powered on according to the power-on instruction.

[0032] Specifically, Figure 2 As shown, the backlight module includes a power module DC-DC, a microcontroller unit MCU and a driver chip LEDDriver. After the backlight module receives a power-on instruction, the power module DC-DC, the microcontroller unit MCU and the driver chip LED Driver in the backlight module are powered on according to the power-on instruction. 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. Then, the power signal can be input to the driver chip through the power module DC-DC, so that the backlight module is in the initial state. Feedback can be performed through the feedback port feedback to avoid output instability.

[0033] In one embodiment, the micro control unit receives a power-on instruction and performs power-on according to the power-on instruction, so that the micro control unit can send and receive signals after power-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 the 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 to prevent 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 internal register of the driver chip LED Driver is controlled by the SPI to turn off the detection function of the driver chip LED Driver to avoid the unstable state at power-on affecting the detection result.

[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, 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 scanning 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 to make the brightness of each light source consistent, so that when monitoring the backlight module, it is easy to check the area and light source where the problem occurs.

[0043] S4, sending a synchronization signal to the driving chip to make the first initialization data of each channel of the driving chip effective.

[0044] Specifically, Figure 2 As shown, a synchronization signal can be sent through the synchronization signal line Vsync, so that the first initial data of each channel of the driving chip can take effect, thereby enabling the light source to light up.

[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 one embodiment, after the driver chip is initialized and the light source is turned on, a real-time detection signal is sent to the driver chip, and the real-time detection result returned by the driver chip is received, so that processing can be performed based on the real-time detection result, taking into account both determining the specific location of the error in the light area and ensuring the display effect.

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

[0048] Specifically, the real-time detection process requires 8 consecutive synchronization cycles to detect an error before determining an error. Therefore, in order to avoid false detection, the present application waits for 10 synchronization cycles and receives the real-time detection results returned by the driver chip within 10 synchronization cycles, so that the real-time detection results can be accurate.

[0049] It should be noted that the above embodiment is described in detail using 10 synchronization cycles as an example, but the embodiment of the present application is not limited to this. For example, you can wait for 8 synchronization cycles or 11 synchronization cycles.

[0050] The technical problem that the real-time detection of the driver chip requires waiting for multiple synchronization cycles, which takes a long time. In one embodiment, the step of sending a real-time detection signal to the driver chip and waiting for 10 synchronization cycles includes: sending a real-time detection signal to the driver chip, sending brightness data in the first time period of the synchronization cycle, sending a control signal and reading data in the second time period of the synchronization cycle; waiting for 10 synchronization cycles. By sending brightness data in the first time period of the synchronization cycle, sending control signals and reading data in the second time period of the synchronization cycle, the initialization time can be reduced, avoiding the initialization time being too long resulting in a long display start time, affecting the user experience, and the process can avoid conflicts between different operations on the control authority of the SPI.

[0051] Specifically, Figure 3 As shown, 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, and the control signal is sent and the data is read at the falling edge, that is, the SPI sends the control signal and reads the data in the control time zone 31, and the SPI sends the brightness data in the brightness time zone 32, thereby reducing the initialization process of the backlight module, avoiding the initialization time being too long resulting in the display being turned on for a long time, affecting the user experience, and the process can avoid conflicts between different operations on the control authority of the SPI.

[0052] S6, when the real-time detection result indicates that the lamp area is abnormal, determining whether the driver chip is initialized for the first time.

[0053] In one embodiment, when the driver chip performs real-time detection, the 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, Figure 2 As shown, the representation of the real-time detection result can be determined by the data returned by the error return line fail back. For example, if fail back returns a low potential, the real-time detection result is characterized as an abnormal light zone; if fail back returns a high potential, the real-time detection result is characterized as a normal light zone, thereby enabling the microcontroller unit to perform corresponding processing according to the returned potential.

[0055] In one embodiment, when the real-time detection result is characterized as abnormality in the light area, the step of determining whether the driver chip is initialized for the first time includes: when the real-time detection result is characterized as abnormality in the light area, 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 light area is abnormal, and determining whether the driver chip is initialized for the first time. When the real-time detection result is characterized as abnormality in the light area, 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, and 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 micro control unit can process accordingly.

[0056] S7, sending a forced detection signal to the driving chip when the driving chip is initialized for the first time.

[0057] In one embodiment, in order 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 make the driver chip 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 a 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 make the driver chip change the detection adjustment, and then a reset signal is sent to the driver chip to suspend scanning and display output, so that the driver chip performs forced detection of row and column scanning rhythm and brightness, and then the driver chip performs forced detection, and receives the forced detection result returned by the driver chip, so that the specific location of the light area where the backlight module has an error can be determined, and because it is in the initialization stage, it will not cause flickering when displayed.

[0059] Specifically, the second initial data includes data for turning off the feedback regulation function of the driver chip and the detection voltage, and the detection voltage in the second initial data is greater than the detection voltage during real-time detection. Thus, the feedback regulation function of the driver chip can be turned off, and the voltage during detection can be increased 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 result of the forced detection, thereby making the detection result of the forced detection 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 according to 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 the problem can be determined by short circuit detection and open circuit detection, so as to facilitate repairing the area with the problem or avoiding the area with the problem, so that the location of the error can be avoided from having too much impact on the display screen during display.

[0062] Specifically, when displaying, by determining the location of the error, key data or key images can be displayed at other locations, avoiding the loss of key data or key images due to the inability to display the error location. 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 driving chip, it is possible to wait for 4 milliseconds until the display output stops, so as to avoid the display output 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 position information obtained in the above manner is only the defined layout of the driver chip, and the position information where the error occurred cannot be determined intuitively. In one embodiment, after the step of sending a forced detection signal to the driver chip and receiving the forced detection result returned by the driver chip, it also includes: determining the 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; determining the 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. By obtaining the mapping table of the light zone layout and the light zone number, the first position information can be converted into the second position information, so that the position information where the error occurred can be determined intuitively, which is convenient for 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~channel 33 indicates the open / short detection results of channels 33 to 48 of the first scan line, and similarly, other columns indicate the open / short detection results of different channels of different scan lines, R indicates that the register can only be read, and in the Default column, when no error occurs, all registers are 1, and after an error occurs, the corresponding register will become 0.

[0069] Table 1. Error message distribution table of driver chip

[0070]

[0071]

[0072] As shown in Table 2 below, Table 2 is a light zone layout table, in which 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, and corresponds to SCAN1 to SCAN4 in Table 1. Ch1 in Table 2 refers to channel 1 in Table 1, and similarly, ch2 to ch48 refer to channel 2 to channel 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 below, Table 3 is a table of light zone numbers. The first row in Table 3 corresponds to the first row in Table 2, and the first column in Table 3 corresponds to the first column in Table 2. The numbers 1 to 192 in the table represent light zone numbers.

[0076] Table 3 Lighting zone number table

[0077]

[0078]

[0079] Specifically, in order to arrange the error information in the driver chip in the order of Table 3, the 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, and the corresponding number is determined according to the error information in the driver chip, thereby determining the address of the write cache area.

[0080] Specifically, taking the error information in the driver chip as the information in Table 1 as an example, according to Tables 2 and 3, it can be known that the 0th bit of the first data read (a total of 16 bits, encoded from 0 to 15), the correct light zone number should be 9, then the bit data should be rewritten into the 9th address space of the cache area, and so on, so that the mapping table shown in Table 4 can be obtained.

[0081] Table 4 Mapping table of light zone layout and light zone 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] It can be seen from Tables 1 to 4 that the mapping table of the light zone layout and the light zone number can be determined according to the light zone layout table and the light zone number table. When the first position information of the light zone with abnormal display is obtained, for example, an error occurs in the first column of the error information distribution table of the driver chip, that is, the open circuit / short circuit detection result of channel 33 to channel 48 of the first scan line is abnormally displayed. Taking Table 4 as an example, the second position information can be obtained as 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, so that the position information where the error occurs can be intuitively viewed.

[0084] 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: sending a shutdown output signal to the driver chip so that the driver chip turns off the abnormally displayed light area. After the forced detection determines the location of the error, the abnormally displayed light area can be turned off to avoid repeated error detection, thereby avoiding repeated error detection.

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

[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 also 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 is characterized by forced detection; and re-performing real-time detection when the processing signal is characterized by a real-time detection result of clearing abnormalities in the light area. By sending the real-time detection result to the client when the driver chip is not initialized for the first time so that the client processes it, sending a forced detection signal to the driver chip when the processing signal returned by the client is characterized by forced detection; and re-performing real-time detection when the processing signal is characterized by a real-time detection result of clearing abnormalities in the light area, 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 driving chip; when the processing signal is characterized by clearing the real-time detection result of the abnormal light 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 in an embodiment of the present application when no detection is performed.

[0089] An embodiment of the present application provides a monitoring method for a backlight module. The monitoring method for the backlight module performs real-time detection on a 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 a 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, the 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.

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

[0091] A first receiving module 401 is used 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 a driver chip in the backlight module after power-on, so that the driver chip is initialized;

[0093] A second sending module 403 is used 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 used to send a synchronization signal to the driver chip to make the first initial data of each channel of the driver chip effective;

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

[0096] A judgment module 406, 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 used to send a forced detection signal to the driving chip when the driving chip is initialized for the first time.

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

[0099] In one embodiment, the second receiving module is used to send a real-time detection signal to the driving 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 it is within 10 synchronization cycles after initialization when the real-time detection result is characterized as an abnormal light zone; when the time is within 10 synchronization cycles after initialization, it is determined that the light 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 the 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 used 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 clearing the real-time detection result of the abnormality in the lamp area.

[0106] An embodiment of the present application provides a monitoring device for a backlight module. When the backlight module is powered on and after the driver chip is initialized, the monitoring device for the backlight module performs real-time detection on the driver chip to determine whether a display abnormality occurs in the light area. When a display abnormality occurs in the light area, it determines 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 light 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, and 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] The 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 to initialize the driver chip, 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, and when the real-time detection result indicates that the light area is abnormal, determines whether the driver chip is initialized for the first time, and when the driver chip is initialized for the first time, sends a forced detection signal 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 determines 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 emphasis. 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 a monitoring device provided in an embodiment of the present application. Specific examples are used herein 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 solution and its core idea 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 replace some of the technical features therein with equivalents; 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 for sending an initialization signal, initial data and a synchronization signal to a driver chip in a backlight module; A receiving module, used for receiving the real-time detection result returned by the driving chip; A judgment module, used for judging 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 according to 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 according to 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, characterized in that: The sending module is also used for: Sending an initialization signal to the driver chip to initialize the driver chip; After the driver chip is initialized, sending first initial data of each channel to the driver chip; as well as A synchronization signal is sent to the driving chip to make the first initial data of each channel of the driving chip effective.

3. The backlight module monitoring device according to claim 1, characterized in that: The receiving module is also used for: Sending a real-time detection signal to the driving 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, characterized in that: The receiving module is also used for: Sending a real-time detection signal to the driving chip; Sending brightness data in a first time period of a synchronization cycle; sending a control signal and reading data in a second time period of the synchronization cycle; as well as Wait for a predetermined number of synchronization cycles.

5. The monitoring device for the backlight module according to claim 1, characterized in that: The judging 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, characterized in that: The processing module is also used for: When the driver chip is initialized for the first time, sending second initial data to the driver chip; Sending a synchronization signal to the driving 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 driving chip, and a forced detection result returned by the driving chip is received.

7. The backlight module monitoring device according to claim 6, characterized in that: The second initial data includes data for shutting down the feedback regulation function of the driving 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, characterized in that: The processing module is also used for: 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 The forced detection result of the driving 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, characterized in that: 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, characterized in that: The processing module is further used to send a shutdown output signal to the driving chip, so that the driving chip turns off the abnormally displayed light area.

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