Backlight display data signal processing method, backlight driving chip and backlight module

Abstract

The invention discloses a backlight display data signal processing method, a backlight driving chip and a backlight module, and the backlight driving chip carries out the shaping processing of a received backlight display data signal, obtains a backlight display data signal represented by a square wave, determines a slope adjustment gear based on a received control instruction, and carries out the adjustment of the slope. And adjusting the rising edge and the falling edge of the backlight display data signal represented by the square wave based on the slope adjustment gear to obtain a target backlight display data signal, and sending the control instruction and the target backlight display data signal to a next-stage backlight driving chip. As the target backlight display data signal sent to the next-stage backlight driving chip is the signal obtained after the rising edge and the falling edge are adjusted, the rising and falling speed of the signal can be reduced, EMI can be reduced, and compared with an EMI reduction mode provided by the related technology, the chip size, noise, heat and cost can be reduced.

Description

Backlight display data signal processing methods, backlight driver chip, and backlight module Technical Field

[0001] This invention relates to the field of chip technology, and in particular to a method for processing backlight display data signals, a backlight driver chip, and a backlight module. Background Technology

[0002] In the chip industry, electromagnetic interference (EMI) is a crucial consideration. With the increasing complexity and high integration of modern electronic devices, the EMI performance of chips, as core components of electronic devices, directly affects the stability and reliability of the entire system.

[0003] Related technologies typically reduce EMI in the following ways: optimizing the layout and wiring of the printed circuit board (PCB) inside the chip, such as reducing the length of the conductors to reduce the current loop; adding EMI suppression circuits in the chip, such as using filters and isolation transformers as EMI suppression circuits; using shields made of metal or highly conductive materials; and using high-quality power supplies and high-quality power line filters.

[0004] Optimizing the layout and routing of the PCB inside the chip imposes significant limitations on PCB design space, potentially increasing the number of PCB layers and raising costs. Adding EMI suppression circuitry to the chip increases its size. Using shielding made of metal or highly conductive materials increases costs and may also affect heat dissipation. Using high-quality power supplies and high-quality power line filters results in higher noise levels and more severe heat generation.

[0005] In summary, using existing technologies to reduce EMI may result in larger chip size, higher noise levels, more heat generation, and higher costs. Summary of the Invention

[0006] This invention provides a method for processing backlight display data signals, a backlight driver chip, and a backlight module to solve the problems that reducing EMI using existing technologies may result in large chip size, high noise, severe heat generation, and high cost.

[0007] In a first aspect, this application provides a method for processing backlight display data signals, applied to a backlight driver chip. The method includes: receiving a control command and a backlight display data signal; shaping the backlight display data signal to obtain an intermediate backlight display data signal represented by a square wave; determining a slope adjustment level based on the control command; adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain a target backlight display data signal; and sending the control command and the target backlight display data signal to a next-level backlight driver chip.

[0008] In one possible implementation, the backlight driver chip includes a target capacitor and M resistors, where M is an integer greater than 1; adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain the target backlight display data signal includes: selecting at least one target resistor from the M resistors based on the slope adjustment level; and controlling the intermediate backlight display data signal to be input to the at least one target resistor and the target capacitor to obtain the target backlight display data signal.

[0009] In one possible implementation, the rising edge of the target backlight display data signal has a first slope, and the falling edge of the target backlight display data signal has a second slope.

[0010] In one possible implementation, obtaining the target backlight display data signal by controlling the intermediate backlight display data signal input to the at least one target resistor and the target capacitor includes: when the intermediate backlight display data signal changes from a first level to a second level, the target capacitor is charged through the at least one target resistor to obtain a target backlight display data signal with a rising edge having the first slope; when the intermediate backlight display data signal changes from the second level to the first level, the target capacitor is discharged through the at least one target resistor to obtain a target backlight display data signal with a falling edge having the second slope.

[0011] In one possible implementation, determining the slope adjustment level based on the control command includes: determining a binary value corresponding to the control command based on the control command; and using the decimal value corresponding to the binary value as the slope adjustment level.

[0012] In one possible implementation, the control command includes a first part and a second part, wherein the first part is used to indicate whether the slope adjustment function is activated, and the second part is used to indicate the slope adjustment level; before determining the binary value corresponding to the control command based on the control command, the method further includes: determining that the slope adjustment function is activated based on the first part of the control command; determining the binary value corresponding to the control command based on the control command includes: determining the binary value corresponding to the control command based on the second part of the control command.

[0013] Secondly, this application also provides a backlight driver chip, comprising: a receiving module for receiving control commands and backlight display data signals; a determining module for shaping the backlight display data signals to obtain an intermediate backlight display data signal represented by a square wave, and determining a slope adjustment level based on the control commands; an adjusting module for adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain a target backlight display data signal; and a transmitting module for transmitting the control commands and the target backlight display data signal to a next-level backlight driver chip.

[0014] In one possible implementation, the backlight driver chip further includes a target capacitor and M resistors, where M is an integer greater than 1; the adjustment module is specifically used to: select at least one target resistor from the M resistors based on the slope adjustment level; and control the intermediate backlight display data signal to be input to the at least one target resistor and the target capacitor to obtain the target backlight display data signal.

[0015] In one possible implementation, the rising edge of the target backlight display data signal has a first slope, and the falling edge of the target backlight display data signal has a second slope.

[0016] In one possible implementation, the adjustment module is specifically used to: when the intermediate backlight display data signal changes from a first level to a second level, the target capacitor is charged through the at least one target resistor to obtain a target backlight display data signal with a rising edge having the first slope; when the intermediate backlight display data signal changes from the second level to the first level, the target capacitor is discharged through the at least one target resistor to obtain a target backlight display data signal with a falling edge having the second slope.

[0017] In one possible implementation, the determining module is specifically used to: determine the binary value corresponding to the control command based on the control command; and use the decimal value corresponding to the binary value as the slope adjustment level.

[0018] In one possible implementation, the control command includes a first part and a second part, wherein the first part is used to characterize whether the slope adjustment function is activated, and the second part is used to characterize the slope adjustment level; before determining the binary value corresponding to the control command based on the control command, the determining module is further configured to: determine whether the slope adjustment function is activated based on the first part of the control command; determining the binary value corresponding to the control command based on the control command includes: determining the binary value corresponding to the control command based on the second part of the control command.

[0019] Thirdly, this application also provides a backlight module, including a backlight controller, LEDs, and Q backlight driver chip groups. Each backlight driver chip group includes K backlight driver chips connected in series as described in any of the first aspects, where Q and K are both integers greater than 1. The first backlight driver chip in the Q backlight driver chip groups is electrically connected to the backlight controller. The backlight controller is used to send control commands and backlight display data signals to the backlight driver chips connected to the backlight controller. The other backlight driver chips, except for the last one, are used to send control commands and target backlight display data signals to the next-level backlight driver chip.

[0020] The beneficial effects of this invention are as follows: The backlight display data signal processing method, backlight driver chip, and backlight module provided in this application involve the backlight driver chip first receiving a control command and a backlight display data signal, which are sent by the backlight controller or the previous-level backlight driver chip. Then, the backlight display data signal is shaped to obtain an intermediate backlight display data signal represented by a square wave. Based on the control command, a slope adjustment level is determined. Then, the rising and falling edges of the intermediate backlight display data signal are adjusted based on the slope adjustment level to obtain the target backlight display data signal. Finally, the control command and the target backlight display data signal are sent to the next-level backlight driver chip. Since the rapid rise and fall of the signal during the flipping process contains abundant high-frequency components, which are one of the main causes of EMI, this application adjusts the rising and falling edges of the intermediate backlight display data signal to obtain the target backlight display data signal. This increases the driving impedance of the signal, reduces the rise and fall rates of the backlight display data signal, reduces high-frequency components, and reduces EMI. Compared with the EMI reduction methods provided by related technologies, this approach can reduce chip size, noise, heat generation, and cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of a backlight module provided in an embodiment of this application; Figure 2 is a schematic diagram of a backlight driver chip provided in an embodiment of this application; Figure 3 is a schematic diagram of a control instruction provided in an embodiment of this application; Figure 4 is a schematic diagram of another control instruction provided in an embodiment of this application; Figure 5 is a schematic diagram of another control instruction provided in an embodiment of this application; Figure 6 is a schematic diagram of a backlight driver chip provided in an embodiment of this application; Figure 7a is a waveform diagram of a target backlight display data signal provided in an embodiment of this application; Figure 7b is a waveform diagram of another target backlight display data signal provided in an embodiment of this application; Figure 7c is a waveform diagram of another target backlight display data signal provided in an embodiment of this application; Figure 7d is a waveform diagram of another target backlight display data signal provided in an embodiment of this application; Figure 8 is a schematic diagram of a backlight display data signal before and after shaping provided in an embodiment of this application; Figure 9 is a schematic diagram of a target backlight display data signal with different slopes provided in an embodiment of this application; Figure 10 is a flowchart of a backlight display data signal processing method provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] When multiple backlight driver chips are connected in series in a backlight module, backlight display data signals need to be transmitted from the backlight controller on the control board to the backlight driver chips, thereby controlling the LEDs connected to the backlight driver chips. These LEDs can be MiniLEDs or other types of LEDs, and this application does not limit them.

[0025] Typically, the backlight driver chips in the backlight module are connected in series, as shown in Figure 1. The backlight module 12 includes an array of Mini LEDs 121 and an array of backlight driver chips 122. The array of backlight driver chips 122 includes nine groups of backlight driver chips 122 connected in series. In each group of backlight driver chips 122 connected in series, the first backlight driver chip 122 is electrically connected to the backlight controller 11.

[0026] The backlight controller 11 sends backlight display data signals to the nine backlight driver chips. Similarly, the nine backlight driver chips that receive the backlight display data signals send backlight display data signals to the next-level backlight driver chip. However, EMI is generated during the transmission of the backlight display data signals.

[0027] The backlight display data signal processing method, backlight driver chip, and backlight module provided in this application embodiment involve the backlight driver chip first receiving a control command and a backlight display data signal, which are sent by a backlight controller or a previous-level backlight driver chip. Then, the backlight display data signal is shaped to obtain an intermediate backlight display data signal represented by a square wave. Based on the control command, a slope adjustment level for adjusting the rising and falling edges of the intermediate backlight display data signal is determined. Then, the rising and falling edges of the intermediate backlight display data signal are adjusted based on the slope adjustment level to obtain a target backlight display data signal. Finally, the control command and the target backlight display data signal are sent to the next-level backlight driver chip. Since the rapid rise and fall of the signal during the flipping process contains abundant high-frequency components, which are one of the main causes of EMI, this embodiment of the application adjusts the rising and falling edges of the intermediate backlight display data signal to obtain the target backlight display data signal, thereby increasing the driving impedance of the signal, reducing the rise and fall rates of the backlight display data signal, reducing high-frequency components, and reducing EMI. Compared with the EMI reduction methods provided by related technologies, this can reduce chip size, noise, heat generation, and cost.

[0028] The processing method for backlight display data signals, the backlight driver chip, and the backlight module provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] Figure 2 shows a schematic diagram of a backlight driver chip provided in an embodiment of this application. The backlight driver chip includes: a receiving module 21, used to receive control commands and backlight display data signals, wherein the control commands and backlight display data signals are sent by a backlight controller or by a previous-level backlight driver chip; a determining module 22, used to perform shaping processing on the backlight display data signals to obtain an intermediate backlight display data signal represented by a square wave, and to determine the slope adjustment level based on the control commands; an adjusting module 23, used to adjust the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain a target backlight display data signal; and a sending module 24, used to send control commands and the target backlight display data signal to a next-level backlight driver chip.

[0030] In this embodiment of the application, if the backlight driver chip is the first backlight driver chip in a series connection, the control command and backlight display data signal received by the receiving module 21 are sent by the backlight controller. If the backlight driver chip is another backlight driver chip in a series connection besides the first backlight driver chip, the control command and backlight display data signal received by the receiving module 21 are sent by the next higher level backlight driver chip in the backlight driver chips connected in series with the first backlight driver chip.

[0031] After receiving the control command and the backlight display data signal, the receiving module 21 sends the control command and the backlight display data signal to the determining module 22. After receiving the control command and the backlight display data signal, the determining module 22 performs shaping processing on the backlight display data signal to obtain the intermediate backlight display data signal represented by a square wave, and determines the slope adjustment level based on the control command. The slope adjustment level is used to adjust the rising edge and the falling edge of the intermediate backlight display data signal.

[0032] In this embodiment, if the backlight driver chip is the first backlight driver chip connected in series, then ideally, the backlight display data signal received by the backlight driver chip is a square wave. However, during signal transmission, due to the influence of impedance such as that of the PCB and signal lines, the backlight display data signal received by the backlight driver chip may not be a standard square wave. Therefore, in order to make the display accurate, after receiving the backlight display data signal, the backlight driver chip will perform shaping processing on the backlight display data signal to obtain a backlight display data signal represented by a square wave, that is, the intermediate backlight display data signal. In other words, after shaping the received backlight display data signal, the obtained backlight display data signal is a standard square wave.

[0033] If the backlight driver chip is a series-connected backlight driver chip other than the first one, the target backlight display data signal received by the backlight driver chip is not a square wave signal because the slope of the rising and falling edges of the backlight display data signal is adjusted by the previous stage backlight driver chip. Therefore, in order to ensure the accuracy of the LED display controlled by the backlight driver chip, the received target backlight display data signal needs to be shaped to obtain a square wave signal, which is the intermediate backlight display data signal represented by a square wave.

[0034] It should be noted that if the backlight driver chip is one of the backlight driver chips in a series connection other than the first backlight driver chip, then the received backlight display data signal is the target backlight display data signal sent by the previous level backlight driver chip.

[0035] In addition to shaping the received backlight display data signal, the determining module 22 also determines the slope adjustment level for adjusting the rising and falling edges of the intermediate backlight display data signal based on the control command.

[0036] Specifically, the determining module 22 determines the binary value corresponding to the control command based on the control command, and uses the decimal value corresponding to the binary value as the slope adjustment level for adjusting the rising and falling edges of the intermediate backlight display data signal.

[0037] In practical implementation, the control command can be a signal consisting of high and low levels. For example, as shown in Figure 3, the control command consists of low level, high level, low level, and high level. The low level represents "0" in binary and the high level represents "1" in binary. The binary value corresponding to this control command is "0101". The decimal value corresponding to the binary value "0101" is "5". Therefore, the slope adjustment level determined based on this control command is "5".

[0038] In one embodiment, the control command may include a first part and a second part, wherein the first part is used to indicate whether the slope adjustment function is enabled, and the second part is used to indicate the slope adjustment level when the adjustment power is enabled; specifically, after receiving the control command, the determining module 22 first determines whether the slope adjustment function is enabled based on the first part of the control command; if it is determined that the slope adjustment function is enabled, it determines the slope adjustment level based on the second part of the control command; if it is determined that the slope adjustment function is not enabled, it ignores the second part of the control command.

[0039] The first part of the control command can also be a signal composed of low levels. For example, as shown in Figure 4, the first part of the control command consists of low level, low level, low level, low level. The binary value corresponding to this first part is "0000", and the decimal value corresponding to this binary value is "0". "0" indicates that the slope adjustment function is not enabled, so the determination module 22 ignores the second part. For another example, as shown in Figure 5, the first part of the control command consists of low level, low level, low level, high level. The binary value corresponding to this first part is "0001", and the decimal value corresponding to this binary value is "1". "1" indicates that the slope adjustment function is enabled. After determining that the slope adjustment function is enabled based on the first part of the control command, the determination module 22 determines that the slope adjustment level is "5" based on the second part.

[0040] The backlight driver chip provided in this application embodiment further includes a target capacitor and M resistors, where M is an integer greater than 1. After determining that the slope adjustment function is enabled and determining the slope adjustment level, the determining module 22 sends the determined slope adjustment level to the adjustment module 23. After receiving the slope adjustment level, the adjustment module 23 selects at least one target resistor from the M resistors based on the slope adjustment level. After controlling the intermediate backlight display data signal to be input to the target capacitor and at least one target resistor, a target backlight display data signal is obtained. The rising edge of the target backlight display data signal has a first slope, and the falling edge of the target backlight display data signal has a second slope.

[0041] After receiving the slope adjustment level, the adjustment module 23 determines at least one target resistor based on the slope adjustment level. Specifically, it can determine at least one target resistor according to a pre-set correspondence. For example, if M is 5, the correspondence is shown in Table 1.

[0042] Table 1

[0043] If the determined slope adjustment level is "1", then the target resistance determined by the adjustment module 23 is R1. If the determined slope adjustment level is "2", then the target resistance determined by the adjustment module 23 is R1 and R2.

[0044] In one embodiment, as shown in FIG6, which is a schematic diagram of a backlight driver chip provided in an embodiment of the present application, the backlight driver chip further includes a target capacitor C1, M resistors (R1, R2, ... RM) and a switching device 61. The M first terminals of the switching device 61 are electrically connected for inputting intermediate backlight display data signals. The M second terminals of the switching device 61 are respectively electrically connected to the first terminal of a resistor. The second terminals of the M resistors are electrically connected to the first terminal of the target capacitor C1 and are used to output the target backlight display data signal. The second terminal of the target capacitor C1 is grounded.

[0045] As shown in Figure 6, the switching device 61 includes M switches, each corresponding to a resistor. When the adjustment module 23 determines at least one target resistor, it can control the switches in the switching device 61. For example, if the target resistor is R1, the adjustment module 23 controls the switch connected to resistor R1 in the switching device 61 to close, so that the intermediate backlight display data signal is input from the input terminal IN, passes through resistor R1, and is output from the output terminal OUT. For another example, if the target resistors are R1 and R2, the adjustment module 23 controls both the switch connected to resistor R1 and the switch connected to resistor R2 in the switching device to close, so that the intermediate backlight display data signal is input from the input terminal IN, passes through resistors R1 and R2, and is output from the output terminal OUT.

[0046] It should be noted that the structure in Figure 6 is only an example. In specific implementations, other structures may also be used, and the embodiments of this application do not impose any restrictions on them.

[0047] In one embodiment, when the intermediate backlight display data signal changes from a first level to a second level, the target capacitor is charged through at least one target resistor to obtain a target backlight display data signal with a rising edge having a first slope; when the backlight display data signal changes from the second level to the first level, the target capacitor is discharged through at least one target resistor to obtain a target backlight display data signal with a falling edge having a second slope.

[0048] The first level can be a low level, and the second level can be a high level.

[0049] The charging and discharging processes in the embodiments of this application will be described in detail below.

[0050] Charging process: When the input signal (intermediate backlight display data signal) changes from low level to high level, the target capacitor begins to charge through at least one target resistor. Assuming the initial voltage of the target capacitor is Vc(0) = 0, the high-level voltage of the intermediate backlight display data signal is Vs, for example, 3.3V, and the low-level voltage of the intermediate backlight display data signal is 0, according to Kirchhoff's laws and the characteristics of capacitors and resistors, the formula for the change of the target capacitor voltage Vc(t) with time t is given by Formula 1: Formula 1: In this formula, e is the natural constant, R is the resistance of the target resistor, C is the capacitance of the target capacitor, and RC is the time constant, denoted by τ.

[0051] At the start of charging (t=0), the voltage across the target capacitor Vc(t) is 0, and the charging current is at its maximum. Where R is the resistance value of the target resistor. For example, if the target resistor is R1, then R is the resistance value of resistor R1. Or, if the target resistors are R1 and R2, then R is the resistance value of resistors R1 and R2 connected in parallel. As time progresses, charge gradually accumulates on the target capacitor, the capacitor voltage Vc(t) gradually increases, and the charging current gradually decreases. When t=τ, the capacitor voltage Vc(t) of the target capacitor reaches approximately [a certain value] of the high-level voltage of the intermediate backlight display data signal. Theoretically, when t approaches infinity, the voltage Vc(t) of the target capacitor can reach the high-level voltage Vs of the intermediate backlight display data signal. However, in practical applications, it is generally believed that the target capacitor is basically charged after 3τ~5τ.

[0052] As can be seen from the above, when the central backlight display data signal changes from low level to high level, that is, at the rising edge of the central backlight display data signal, the rising edge of the signal waveform is no longer an ideal vertical rise, but shows a gradually rising slope, that is, the first slope. This is because the target capacitor needs time to charge, so the signal voltage cannot reach the high level instantly.

[0053] Discharge process: When the input signal (intermediate backlight display data signal) changes from high level to low level, the target capacitor begins to discharge through at least one target resistor. Assuming the initial voltage of the target capacitor is Vc(0) = Vs, the formula for the change of the target capacitor voltage Vc(t) with time t during the discharge process is Equation 2: Formula 2 states that at the start of discharge (t=0), the voltage across the target capacitor is Vs, and the discharge current is at its maximum. As time progresses, the charge on the target capacitor gradually decreases, the capacitor voltage Vc(t) gradually decreases, and the discharge current also gradually decreases. When t=τ, the capacitor voltage of the target capacitor drops to approximately [a certain percentage] of the initial voltage. Similarly, theoretically, the voltage across the target capacitor can only drop to zero when t approaches infinity, but in practice, the target capacitor discharges essentially completely after 3τ~5τ.

[0054] As can be seen from the above, when the center backlight display data signal changes from high level to low level, that is, at the falling edge of the center backlight display data signal, the falling edge of the signal waveform is no longer an ideal vertical drop, but presents a gradually decreasing slope, that is, the second slope.

[0055] As shown in Figure 7a, the first slope and the second slope both correspond to slope adjustment gear "1"; as shown in Figure 7b, the first slope and the second slope both correspond to slope adjustment gear "2"; as shown in Figure 7c, the first slope and the second slope both correspond to slope adjustment gear "3"; as shown in Figure 7d, the first slope and the second slope both correspond to slope adjustment gear "4".

[0056] In this embodiment of the application, different slopes (first slope and second slope) result in different degrees of EMI improvement; the larger the slope (first slope and second slope), the greater the degree of EMI improvement.

[0057] In practical implementation, the required slope can be selected according to the actual application scenario. For example, the more backlight driver chips connected in series, the larger the slope adjustment level, and the larger the corresponding slope. After determining a slope adjustment level, all backlight driver chips connected in series will adjust the slope of the rising edge and the slope of the falling edge of the intermediate backlight display data signal according to the determined slope adjustment level.

[0058] For example, when transmitting signals at a rate of 1MHz, the EMI is found to be higher than the standard value due to the high rate. The method provided in this application embodiment is used to adjust the slope of the rising and falling edges of the backlight display data signal to reduce EMI. When the slope adjustment function is not enabled, the backlight display data signals output by the backlight driver chip are all square waves. Since the backlight module includes multiple sets of backlight driver chips connected in series, multiple backlight driver chips may transmit signals simultaneously at the same time. Simultaneous signal transmission by multiple backlight driver chips also leads to high EMI. However, with the slope adjustment function enabled, the signal transmission slope is larger, and the EMI is correspondingly reduced.

[0059] It should be noted that the adjustment of the rising edge slope and falling edge slope of the backlight display data signal in this embodiment is only to reduce EMI during signal transmission. Therefore, after receiving the target backlight display data signal, the backlight driver chip needs to perform shaping processing on the target backlight display data signal and then shape it into a square wave signal.

[0060] Figure 8 shows a schematic diagram of a backlight display data signal before and after shaping, according to an embodiment of this application.

[0061] In this embodiment, the backlight display data signal is shaped to obtain an intermediate backlight display data signal represented by a square wave. The shaping method provided by related technologies can be referred to, and will not be repeated here.

[0062] Figure 9 shows a schematic diagram of a target backlight display data signal with different slopes provided in an embodiment of this application. In this embodiment, when the backlight controller sends different control commands to the backlight driver chip, the backlight driver chip adjusts the slope of the rising edge and the slope of the falling edge of the backlight display data signal to obtain target backlight display data signals with different slopes (first slope and second slope).

[0063] In practice, the more "square" a square wave is, the shorter its rise / fall time, and the more high-frequency harmonic energy it contains, thus generating greater EMI. Slowing down the slope of the signal's rise / fall time (increasing the rise / fall time) essentially actively eliminates these high-frequency components, thereby reducing EMI. An ideal square wave (with a rise / fall time of 0) contains odd harmonics with infinite amplitude and infinite frequency in the frequency domain. The envelope of its harmonic amplitude decays slowly at a rate of -20 dB / decade (20 dB attenuation per decade), meaning that even at high frequencies, its energy is still significant. In contrast, a practical square wave with a preferred rise / fall time has its high-frequency harmonic components significantly suppressed.

[0064] Based on the same inventive concept, this application also provides a backlight module. The principle of the backlight module in solving the technical problem is similar to that of the backlight driver chip in solving the technical problem. The implementation of the backlight module can refer to the implementation of the backlight driver chip, and the repeated parts will not be described again.

[0065] A backlight module includes a backlight controller, LEDs, and Q backlight driver chip groups. Each backlight driver chip group includes K backlight driver chips connected in series as described above, where Q and K are both integers greater than 1. The first backlight driver chip in the Q backlight driver chip groups is electrically connected to the backlight controller. The backlight controller is used to send control commands and backlight display data signals to the backlight driver chips connected to it. The other backlight driver chips, except for the last one, are used to send control commands and target backlight display data signals to the next-level backlight driver chip.

[0066] Based on the same inventive concept, this application also provides a method for processing backlight display data signals. The principle of the method for processing backlight display data signals to solve the technical problem is similar to that of the backlight driver chip described above. The implementation of the method for processing backlight display data signals can refer to the implementation of the backlight driver chip, and the repeated parts will not be described again.

[0067] Figure 10 shows a flowchart of a backlight display data signal processing method provided in an embodiment of this application. This backlight display data signal processing method is applied to a backlight driver chip and includes the following steps: S101, receiving a control command and a backlight display data signal; S102, shaping the backlight display data signal to obtain an intermediate backlight display data signal represented by a square wave, and determining a slope adjustment level based on the control command; S103, adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain a target backlight display data signal; S104, sending the control command and the target backlight display data signal to the next-level backlight driver chip.

[0068] In one embodiment, the rising edge of the target backlight display data signal has a first slope, and the falling edge of the target backlight display data signal has a second slope.

[0069] In one embodiment, the backlight driver chip includes a target capacitor and M resistors, where M is an integer greater than 1; adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain the target backlight display data signal includes: selecting at least one target resistor from the M resistors based on the slope adjustment level; and controlling the intermediate backlight display data signal to be input to the at least one target resistor and the target capacitor to obtain the target backlight display data signal.

[0070] In one embodiment, the step of controlling the intermediate backlight display data signal to be input to the target capacitor and the at least one target resistor to obtain the target backlight display data signal includes: when the intermediate backlight display data signal changes from a first level to a second level, the target capacitor is charged through the at least one target resistor to obtain a target backlight display data signal with a rising edge having the first slope; when the intermediate backlight display data signal changes from the second level to the first level, the target capacitor is discharged through the at least one target resistor to obtain a target backlight display data signal with a falling edge having the second slope.

[0071] In one embodiment, determining the slope adjustment level based on the control command includes: determining a binary value corresponding to the control command based on the control command; and using the decimal value corresponding to the binary value as the slope adjustment level.

[0072] In one embodiment, the control command includes a first part and a second part, wherein the first part is used to indicate whether the slope adjustment function is activated, and the second part is used to indicate the slope adjustment level; before determining the binary value corresponding to the control command based on the control command, the method further includes: determining that the slope adjustment function is activated based on the first part of the control command; determining the binary value corresponding to the control command based on the control command includes: determining the binary data corresponding to the control command based on the second part of the control command.

[0073] The backlight display data signal processing method provided in this application embodiment first receives a control command and a backlight display data signal, which are sent by a backlight controller or a previous-level backlight driver chip. Then, the backlight display data signal is shaped to obtain a backlight display data signal represented by a square wave. Based on the control command, a slope adjustment level for adjusting the rising and falling edges of the backlight display data signal is determined. Then, the rising and falling edges of the backlight display data signal are adjusted based on the slope adjustment level to obtain a target backlight display data signal, wherein the rising edge of the target backlight display data signal has a first slope and the falling edge of the target backlight display data signal has a second slope. Finally, the control command and the target backlight display data signal are sent to the next-level backlight driver chip. Since the rapid rise and fall of the signal during the flipping process contains abundant high-frequency components, which are one of the main causes of EMI, this embodiment of the application adjusts the rising and falling edges of the backlight display data signal to obtain a target backlight display data signal with a first slope for the rising edge and a second slope for the falling edge. This increases the driving impedance of the signal, reduces the rise and fall rates of the backlight display data signal, reduces high-frequency components, and thus reduces EMI. Compared with the EMI reduction methods provided by related technologies, this approach can reduce chip size, noise, heat generation, and cost.

[0074] The present application has been described above with reference to block diagrams and / or flowcharts illustrating methods, apparatus (systems), and / or computer program products according to embodiments of the present application. It should be understood that a block of a block diagram and / or flowchart, as well as combinations of blocks of block diagrams and / or flowcharts, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, and / or other programmable data processing means to produce a machine such that the instructions, executable via the computer processor and / or other programmable data processing means, create methods for implementing the functions / actions specified in the blocks of the block diagrams and / or flowcharts.

[0075] Accordingly, this application can also be implemented using hardware and / or software (including firmware, resident software, microcode, etc.). Furthermore, this application can take the form of a computer program product on a computer-usable or computer-readable storage medium, having computer-usable or computer-readable program code implemented in the medium for use by or in conjunction with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium can be any medium that can contain, store, communicate, transmit, or deliver a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0076] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for processing backlight display data signals, characterized in that, The method, applied to a backlight driver chip, includes: receiving a control command and a backlight display data signal; shaping the backlight display data signal to obtain an intermediate backlight display data signal represented by a square wave; determining a slope adjustment level based on the control command; adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain a target backlight display data signal; and sending the control command and the target backlight display data signal to the next-level backlight driver chip.

2. The method as described in claim 1, characterized in that, The backlight driver chip includes a target capacitor and M resistors, where M is an integer greater than 1. The step of adjusting the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain the target backlight display data signal includes: selecting at least one target resistor from the M resistors based on the slope adjustment level; and controlling the intermediate backlight display data signal to be input to the at least one target resistor and the target capacitor to obtain the target backlight display data signal.

3. The method as described in claim 2, characterized in that, The rising edge of the target backlight display data signal has a first slope, and the falling edge of the target backlight display data signal has a second slope.

4. The method as described in claim 3, characterized in that, The step of controlling the input of the intermediate backlight display data signal to the at least one target resistor and the target capacitor to obtain the target backlight display data signal includes: when the intermediate backlight display data signal changes from a first level to a second level, the target capacitor is charged through the at least one target resistor to obtain a target backlight display data signal with a rising edge having the first slope; when the intermediate backlight display data signal changes from the second level to the first level, the target capacitor is discharged through the at least one target resistor to obtain a target backlight display data signal with a falling edge having the second slope.

5. The method according to any one of claims 1 to 4, characterized in that, Determining the slope adjustment level based on the control command includes: determining a binary value corresponding to the control command based on the control command; and using the decimal value corresponding to the binary value as the slope adjustment level.

6. The method as described in claim 5, characterized in that, The control command includes a first part and a second part, wherein the first part is used to indicate whether the slope adjustment function is activated, and the second part is used to indicate the slope adjustment level; before determining the binary value corresponding to the control command based on the control command, the method further includes: determining that the slope adjustment function is activated based on the first part of the control command; determining the binary value corresponding to the control command based on the control command includes: determining the binary value corresponding to the control command based on the second part of the control command.

7. A backlight driver chip, characterized in that, include: The receiving module is used to receive control commands and backlight display data signals; The determining module is used to perform shaping processing on the backlight display data signal to obtain an intermediate backlight display data signal represented by a square wave, and to determine the slope adjustment level based on the control command; The adjustment module is used to adjust the rising and falling edges of the intermediate backlight display data signal based on the slope adjustment level to obtain the target backlight display data signal; the sending module is used to send the control command and the target backlight display data signal to the next-level backlight driver chip.

8. The backlight driver chip as described in claim 7, characterized in that, The backlight driver chip also includes a target capacitor and M resistors, where M is an integer greater than 1; the adjustment module is specifically used to: select at least one target resistor from the M resistors based on the slope adjustment level; and control the backlight display data signal to be input to the at least one target resistor and the target capacitor to obtain the target backlight display data signal.

9. The backlight driver chip as described in claim 8, characterized in that, The rising edge of the target backlight display data signal has a first slope, and the falling edge of the target backlight display data signal has a second slope.

10. The backlight driver chip as described in claim 9, characterized in that, The adjustment module is specifically used to: when the intermediate backlight display data signal changes from the first level to the second level, the target capacitor is charged through the at least one target resistor to obtain a target backlight display data signal with a rising edge having the first slope; When the intermediate backlight display data signal changes from the second level to the first level, the target capacitor discharges through the at least one target resistor to obtain a target backlight display data signal with a falling edge having the second slope.

11. A backlight module, characterized in that, The system includes a backlight controller, LEDs, and Q backlight driver chip groups. Each backlight driver chip group includes K backlight driver chips connected in series as described in any one of claims 7 to 10, where Q and K are both integers greater than 1. The first backlight driver chip in the Q backlight driver chip groups is electrically connected to the backlight controller. The backlight controller is used to send control commands and backlight display data signals to the backlight driver chips connected to it. The other backlight driver chips, except for the last one, are used to send control commands and target backlight display data signals to the next-level backlight driver chip.

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