Backlight control system and backlight driving chip used therein
By designing a control module that automatically detects and sets the master-slave relationship of the bidirectional communication module in the backlight driver chip, the problem of fixed master-slave port position during wiring of the backlight control system is solved, and the wiring process of lower costs and simplifies the application is achieved.
Patent Information
- Application Number
- CN202510502782.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-06-06
AI Technical Summary
When wiring, the existing backlight control system is fixed in the main communication port and slave communication port, it is impossible to ensure that the main communication port of each backlight driver chip is closer to the previous level of backlight driver chip than the slave communication port, resulting in increased wiring costs and increased application difficulty.
A backlight driving chip is designed, which includes two bidirectional communication modules and a control module. By detecting the input signal strength in the bidirectional communication module, the control module sets one bidirectional communication module whose input signal strength is greater than the threshold strength as the main communication module, and the other bidirectional communication module is set as the slave communication module, thereby automatically determining the master-slave relationship of the communication port.
By automatically determining the master-slave relationship of the communication port, the dependence on the orientation adjustment and routing mode of the backlight driver chip during wiring is reduced, the wiring cost is reduced and the application difficulty is simplified.
Smart Images
Figure CN120108345A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of integrated circuits, and in particular to a backlight control system and a backlight driving chip used therein. Background Art
[0002] With the development of light emitting diode (LED) display technology, mini LED (Mini LED) display devices can adjust the brightness of different Mini LEDs according to the images displayed on the screen to improve the picture effect, and are therefore becoming more and more popular.
[0003] Figure 1 FIG. 1 shows a schematic block diagram of a Mini LED backlight control system. Figure 1 As shown, the backlight control system 100 includes a backlight controller 102 and backlight driver chips 104-1 to 104-n (n is an integer greater than 1) cascaded in a single-line link, wherein each backlight driver chip has a main communication port (M) and a slave communication port (S), receives a signal from the backlight controller 102 or the upper-level backlight driver chip through the main communication port, and outputs a signal to the lower-level backlight driver chip or the backlight controller 102 through the slave communication port.
[0004] At present, the positions of the master communication port and the slave communication port in the backlight driver chip are fixed. When wiring between the backlight driver chips, it is impossible to ensure that the master communication port of each backlight driver chip is closer to the previous backlight driver chip than the slave communication port. Therefore, it may be necessary to rotate the orientation of the backlight driver chip, change the routing method, or add additional jumpers, which increases the wiring cost of the backlight control system and increases the difficulty of application. Summary of the invention
[0005] A backlight driver chip used in a backlight control system according to an embodiment of the present invention includes two bidirectional communication modules and a control module, wherein the control module is configured to: set the two bidirectional communication modules to a signal input mode; detect the input signal strength of each of the two bidirectional communication modules; and set one of the two bidirectional communication modules, whose input signal strength is greater than a threshold strength, as a master communication module of the backlight driver chip, and set the other of the two bidirectional communication modules to be a slave communication module of the backlight driver chip.
[0006] A backlight control system according to an embodiment of the present invention includes: a backlight controller; and one or more of the above-mentioned backlight driving chips. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The present invention can be better understood from the following description of specific embodiments of the present invention in conjunction with the accompanying drawings, in which:
[0008] Figure 1 A schematic block diagram showing the system architecture of a traditional backlight control system.
[0009] Figure 2 A schematic block diagram showing an example structure of a backlight driving chip used in a backlight control system according to an embodiment of the present invention.
[0010] Figure 3 Shown in Figure 2 A schematic block diagram of an example structure of a bidirectional communication module in a backlight driver chip is shown.
[0011] Figure 4A , Figure 4B , Figure 4C ,and Figure 4D Shown in Figure 2 A schematic block diagram of an example structure of a detection module in a backlight driver chip is shown.
[0012] Figure 5A and Figure 5B They are shown respectively Figure 4A and Figure 4B Example waveform plots of multiple signals in .
[0013] Figure 6 Shows Figure 2 The schematic flow chart of the communication module setting process executed by the backlight driver chip is shown.
[0014] Figure 7 A schematic diagram showing the system architecture of a backlight control system according to an embodiment of the present invention is shown.
[0015] Fig. 8A , Figure 8B Shown in Figure 7 An example waveform diagram of a backlight control system is shown. DETAILED DESCRIPTION
[0016] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific configuration and algorithm proposed below, but covers any modification, replacement and improvement of elements, parts and algorithms without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention. In addition, it should be noted that the term "A is connected to B" used here can mean "A is directly connected to B" and can also mean "A is indirectly connected to B via one or more other elements".
[0017] In view of the problems existing in the traditional backlight control system, a backlight control system according to an embodiment of the present invention and a backlight driver chip used therein are proposed, wherein the backlight driver chip includes two bidirectional communication modules with the same circuit structure. The user can use any one of the bidirectional communication modules in the backlight driver chip as the main communication module according to the actual layout, connect its communication port to the backlight controller in the backlight control system or the upper-level backlight driver chip, and use the other bidirectional communication module in the backlight driver chip as the slave communication module, connect its communication port to the lower-level backlight driver chip or the backlight controller in the backlight control system. When wiring, there is no need to consider the position of the communication ports of the main communication module and the slave communication module to adjust the orientation of the backlight driver chip, change the wiring method, or add additional jumpers, and the wiring cost is low. It should be noted that in actual applications, the last-level backlight driver chip in the backlight control system can be connected to other devices to form a unidirectional link, or it can be connected to the backlight controller to form a link ring connected end to end.
[0018] Figure 2 FIG. 2 is a schematic block diagram showing an exemplary structure of a backlight driver chip used in a backlight control system according to an embodiment of the present invention. Figure 2As shown, the backlight driver chip 200 used in the backlight control system includes two bidirectional communication modules (i.e., a first communication module 202 and a second communication module 204) and a control module 206, wherein the control module 206 is configured to: set the two bidirectional communication modules to a signal input mode; detect the input signal strength of each of the two bidirectional communication modules; set one of the two bidirectional communication modules, whose input signal strength is greater than a threshold strength, as the master communication module of the backlight driver chip, and set the other of the two bidirectional communication modules as the slave communication module of the backlight driver chip. That is, when both bidirectional communication modules are set to the signal input mode, the control module 206 does not distinguish between the master / slave communication modules, detects the input signal strength of each bidirectional communication module, and if the input signal strength of the first communication module 202 is greater than the threshold strength, sets the first communication module 202 to the master communication module and sets the second communication module 204 to the slave communication module; if the input signal strength of the second communication module 204 is greater than the threshold strength, sets the second communication module 204 to the master communication module and sets the first communication module 202 to the slave communication module.
[0019] Figure 3 Shown in Figure 2 The schematic block diagram of the example structure of the bidirectional communication module in the backlight driver chip shown in FIG. Figure 3 As shown, in some embodiments, it can be used as Figure 2 The bidirectional communication module 300 of the first communication module 202 and the second communication module 204 shown may include a signal input link 302 and a signal output link 304 connected in parallel between the control module 206 and the communication port 10 of the bidirectional communication module 300, wherein the bidirectional communication module 300 is set to the signal output mode when the signal output link 304 is valid and is set to the signal input mode when the signal output link 304 is invalid. Here, the bidirectional communication module 300 is connected to the outside through the communication port 10, and in the signal input mode, the communication port 10 receives the external signal and transmits it to the control module 206 through the signal input link 302, and in the signal output mode, the signal output by the control module 206 is sent to the outside through the signal output link 304 and the communication port 10.
[0020] like Figure 3As shown, in some embodiments, the signal input link 302 can be implemented by a buffer, the output end of the buffer is connected to the signal input end INPUT of the control module 206, and the input end is connected to the communication port IO; the signal output link 304 can also be implemented by a buffer, the input end of the buffer is connected to the signal output end OUTPUT of the control module 206, the enable end is connected to the output enable end PORT_EN of the control module 206, and the output end is connected to the communication port IO. When the output enable signal Output_en is in a valid state, the signal output link 304 is valid, and the two-way communication module 300 is in a signal output mode. When the output enable signal Output_en is in an invalid state, the signal output link 304 is invalid, and the two-way communication module 300 is in a signal input mode, that is, the communication port IO is in a high impedance state.
[0021] like Figure 2 As shown, in some embodiments, the backlight driver chip 200 may also include two detection modules (i.e., a first detection module 208 and a second detection module 210) corresponding to the two bidirectional communication modules respectively, and each of the two detection modules includes: a first resistor connected to the communication port of the corresponding bidirectional communication module of the two bidirectional communication modules, used to set the initial state of the level at the communication port of the corresponding bidirectional communication module; a port bias unit connected in parallel with the first resistor, the port bias unit including a switch and a port bias element connected in series between the first end of the first resistor and the second end of the first resistor, the port bias element being used to set the bias state of the voltage at the communication port of the corresponding bidirectional communication module based on the initial state of the voltage at the communication port of the corresponding bidirectional communication module when the switch is in a closed state; and a comparator connected to the control module at the output end, used to compare the threshold voltage and the voltage at the communication port of the corresponding bidirectional communication module to generate a detection result, and the detection result is used to indicate whether the input signal strength of the corresponding bidirectional communication module is greater than the threshold strength.
[0022] Specifically, the port biasing element may be, for example, a second resistor or a current source. Typically, the initial state of the voltage at the communication port is set to be the same as the idle level of the communication bus. The first resistor is connected between the communication port of the corresponding two-way communication module and the ground terminal, and is used to set the initial state of the voltage at the communication port of the corresponding two-way communication module to a low level, or the first resistor is connected between the communication port of the corresponding two-way communication module and a preset power supply, and is used to set the initial state of the voltage at the communication port of the corresponding two-way communication module to a high level. In some embodiments, the resistance of the first resistor is relatively large, which is conducive to setting the initial state of the voltage at the communication port; and the resistance of the second resistor is much smaller than the first resistor, which is conducive to setting the bias state of the communication port.
[0023] Figure 4A Shown in Figure 2The schematic block diagram of the exemplary structure of the detection module in the backlight driver chip is shown in FIG. Figure 4A As shown, in some embodiments, it can be used as Figure 2 The detection module 400 of the first detection module 208 and the second detection module 210 shown may include a first resistor R1, a second resistor R2 as a port biasing element, a switch Q (for example, a switch tube), and a comparator U, wherein the first end of the first resistor R1 is connected to the communication port IO, and the second end is connected to the ground end, the second resistor R2 and the switch Q are connected in series between the first end and the second end of the first resistor R1, the control module 206 can send a control signal S1 to control the state of the switch Q, the non-phase input end of the comparator U is connected to the communication port IO, the inverting input end is connected to the threshold voltage Vref, and the output end sends a detection signal S2 indicating the detection result to the control module 206.
[0024] Figure 4B Shown in Figure 2 The schematic block diagram of the exemplary structure of the detection module in the backlight driver chip is shown in FIG. Figure 4B As shown, in some embodiments, it can be used as Figure 2 The detection module 400 of the first detection module 208 and the second detection module 210 shown may include a first resistor R1, a second resistor R2 as a port bias element, a switch Q (for example, a switch tube), a comparator U, and an inverter Inv, wherein a first end of the first resistor R1 is connected to the communication port IO, and a second end is connected to a preset power supply VDD, the second resistor R2 and the switch Q are connected in series between the first end and the second end of the first resistor R1, an input end of the inverter Inv is connected to the control module 206, and an output end is connected to the control end of the switch Q, the control module 206 can send a control signal S1 to control the state of the switch Q, an inverting input end of the comparator U is connected to the communication port IO, a non-inverting input end is connected to a threshold voltage Vref, and an output end sends a detection signal S2 indicating a detection result to the control module 206.
[0025] Figure 4C Shown in Figure 2 The schematic block diagram of the exemplary structure of the detection module in the backlight driver chip is shown in FIG. Figure 4C As shown, in some embodiments, it can be used as Figure 2The detection module 400 of the first detection module 208 and the second detection module 210 shown may include a first resistor R1, a current source Iref as a port bias element, a switch Q (for example, a switch tube), and a comparator U, wherein a first end of the first resistor R1 is connected to the communication port IO, and a second end is connected to the ground end, the current source Iref and the switch Q are connected in series between the first end and the second end of the first resistor R1, the control module 206 can send a control signal S1 to control the state of the switch Q, the non-phase input end of the comparator U is connected to the communication port IO, the inverting input end is connected to the threshold voltage Vref, and the output end sends a detection signal S2 indicating the detection result to the control module 206.
[0026] Figure 4D Shown in Figure 2 The schematic block diagram of the exemplary structure of the detection module in the backlight driver chip is shown in FIG. Figure 4D As shown, in some embodiments, it can be used as Figure 2 The detection module 400 of the first detection module 208 and the second detection module 210 shown may include a first resistor R1, a current source Iref as a port bias element, a switch Q (for example, a switch tube), a comparator U, and an inverter Inv, wherein a first end of the first resistor R1 is connected to the communication port IO, and a second end is connected to a preset power supply VDD, the current source Iref and the switch Q are connected in series between the first end and the second end of the first resistor R1, an input end of the inverter Inv is connected to the control module 206, and an output end is connected to the control end of the switch Q, the control module 206 can send a control signal S1 to control the state of the switch Q, a non-phase input end of the comparator U is connected to the communication port IO, an inverting input end is connected to a threshold voltage Vref, and an output end sends a detection signal S2 indicating a detection result to the control module 206.
[0027] like FIG. 4A to FIG. 4D As shown, the control module 206 controls the state of the switch Q to be closed or open by sending a control signal S1. Of the two input terminals (i.e., the positive input terminal and the negative input terminal) of the comparator U, one input terminal receives the voltage at the communication port (i.e., connected to the communication port IO), the other input terminal receives the threshold voltage Vref, and the output terminal sends a detection signal S2 indicating the detection result to the control module 206.
[0028] Figure 5A Shows Figure 4A Example waveforms of multiple signals in IO represents the voltage at the communication port (ie, the port voltage), S1 represents the control signal of the state of the control switch Q sent by the control module 206, and S2 represents the detection signal representing the detection result received by the control module 206. Figure 5AAs shown, the initial state of the voltage at the communication port is low level, and the effective signal at the communication port (i.e., the signal when the input signal strength is greater than the threshold strength) is a pull-up signal. At time T0, the backlight driver chip 200 is powered on, the bidirectional communication module is set to the signal input mode, the control signal S1 changes from low level to high level, and the switch Q changes from the open state to the closed state. At this time, the external signal is not pulled up, and the voltage at the communication port is still low level. The port voltage V IO is a low voltage less than the threshold voltage Vref; at time T1, a pull-up interference signal appears outside the communication port, and the port voltage V IO It fluctuates upward, but because it is not greater than the threshold voltage Vref, the comparator U outputs the detection signal S2 and maintains a low level; at time T2, a pull-up signal appears outside the communication port and the input signal strength is greater than the threshold strength, resulting in the port voltage V IO When the input signal strength of any two-way communication module is greater than the threshold voltage Vref, the detection signal S2 output by the comparator U becomes high level, indicating that the current input signal strength is greater than the threshold strength. After the control module 206 detects that the input signal strength of any two-way communication module is greater than the threshold strength, the two-way communication module is set as the master communication module and the other two-way communication module is set as the slave communication module, and at the same time, the switch Q in the detection module is set to the disconnected state by setting the control signal S1 low.
[0029] Figure 5B Shows Figure 4B Example waveforms of multiple signals in IO represents the voltage at the communication port (ie, the port voltage), S1 represents the control signal of the state of the control switch Q sent by the control module 206, and S2 represents the detection signal representing the detection result received by the control module 206. Figure 5B As shown, the initial state of the voltage at the communication port is high level, and the effective signal at the communication port is a pull-down signal. At T0, the backlight driver chip is powered on, the two-way communication module is set to signal input mode, the control signal S1 changes from low level to high level, and the switch Q changes from open state to closed state. At this time, the external signal is not pulled down, the voltage at the communication port is still at a high level, and the port voltage V IO is a high voltage greater than the threshold voltage Vref; at time T1, a pull-down interference signal appears outside the communication port, and the port voltage V IO It fluctuates downward, but because it is not less than the threshold voltage Vref, the detection signal S2 output by the comparator U remains at a low level; at time T2, a pull-down signal appears outside the communication port and the input signal strength is greater than the threshold strength, resulting in the port voltage V IOWhen the input signal strength of any two-way communication module is greater than the threshold strength, the detection signal S2 output by the comparator U changes to a high level, indicating that the current input signal strength is greater than the threshold strength. After the control module 206 detects that the input signal strength of any two-way communication module is greater than the threshold strength, the two-way communication module is set as the master communication module and the other two-way communication module is set as the slave communication module, and at the same time, the switch Q in the detection module is set to the disconnected state by setting the control signal S1 low.
[0030] exist Figure 4C and Figure 4D In the figure, the current source Iref is used as a port bias element. When the pull-up / pull-down driving capability of the external signal input to the communication port of the bidirectional communication module is higher than the set current corresponding to the threshold strength, that is, the input signal strength of the communication port is greater than the threshold strength, the port voltage changes, which in turn causes the detection signal S2 output by the comparator to change.
[0031] In some embodiments, the control module 206 may be further configured to control the switch Q in the detection module 400 to change from a closed state to an open state. After the master / slave communication module is set, the switch Q in each detection module is changed from a closed state to an open state, and the communication port of the corresponding two-way communication module is no longer affected by the port bias element, and the control module 206 can perform conventional communication with the backlight controller or other backlight driver chips through the master / slave communication module.
[0032] In some embodiments, the control module 206 can be further configured to receive a first control signal from a backlight controller or an upper-level backlight driver chip in a backlight control system through the main communication module when the main communication module is set to a signal input mode and the slave communication module is set to a signal output mode, and to send a second control signal based on the first control signal to a lower-level backlight driver chip in the backlight control system through the slave communication module.
[0033] In some embodiments, the control module 206 can be further configured to receive a first feedback signal from a next-level backlight driver chip through the slave communication module when the main communication module is set to a signal output mode and the slave communication module is set to a signal input mode, and to send a second feedback signal based on the first feedback signal to an upper-level backlight driver chip or a backlight controller through the main communication module.
[0034] Figure 6 Shows Figure 2 The schematic flow chart of the communication module setting process performed by the backlight driver chip shown in FIG. Figure 6 As shown, in some embodiments, Figure 2The communication module setting process performed by the backlight driver chip shown includes: S602, the backlight driver chip 200 is powered on, the control module 206 sets the two bidirectional communication modules to the signal input mode, and detects the input signal strength of each bidirectional communication module; S604, the control module 206 sets one of the two bidirectional communication modules whose input signal strength is greater than the threshold strength as the main communication module, and sets the other bidirectional communication module as the slave communication module; S606, the control module 206 sends a signal whose signal strength is greater than the threshold strength through the slave communication module; S608, the backlight driver chip 200 enters the normal working mode, and the control module 206 performs signal reception and transmission processing according to the settings of the main communication module and the slave communication module.
[0035] Figure 7 FIG. 2 is a schematic diagram showing a system architecture of a backlight control system according to an embodiment of the present invention. Figure 7 As shown, the backlight control system 700 includes a backlight controller 702 and backlight driver chips 704-1 to 704-n, wherein the backlight driver chips 704-1 to 704-n can be implemented as a combination of the above Figures 2 to 6 The backlight driver chip 200 described above can be cascaded via a single-wire link between the backlight controller 702 and the backlight driver chips 704 - 1 to 704 - n , and the last-stage backlight driver chip 704 - n can be connected to the backlight controller 702 or not.
[0036] Fig. 8A and Figure 8B Shown in Figure 7 The example waveform diagram in the backlight control system shown in the figure, wherein D01 represents the signal between the backlight controller 702 and the first-level backlight driver chip 704-1 in the backlight control system 700, D12 represents the signal between the first-level backlight driver chip 704-1 and the second-level backlight driver chip 704-2, D23 represents the signal between the second-level backlight driver chip 704-2 and the third-level backlight driver chip 704-3, and D(n-1)n represents the signal between the n-1th level backlight driver chip 704-(n-1) and the nth level backlight driver chip 704-n in the backlight control system 700. Fig. 8A and Figure 8BAs shown, in some embodiments, the backlight controller 702 sends a signal whose signal strength is greater than a threshold strength to the first-level backlight driver chip 704-1, and the bidirectional communication module in the first-level backlight driver chip 704-1 connected to the backlight controller 702 receives the signal (i.e., the transition edge of D01). At time t1, the control module of the first-level backlight driver chip 704-1 sets the bidirectional communication module as the master communication module and sets another bidirectional communication module as the slave communication module. At the same time, the control module of the first-level backlight driver chip 704-1 disconnects the switch in the detection module, and the level of D01 recovers from the near working communication level to the working communication level; then the control module of the first-level backlight driver chip 704-1 transmits the bidirectional communication module to the slave communication module through the slave communication module. The block sends a signal with a signal strength greater than the threshold strength, and the two-way communication module in the second-level backlight driver chip 704-2 connected to the first-level backlight driver chip 704-1 receives the signal (i.e., the transition edge of D12). At time t2, the control module of the second-level backlight driver chip 704-2 sets the two-way communication module as the main communication module, and the other two-way communication module is set as the slave communication module. At the same time, the control module of the second-level backlight driver chip 704-2 disconnects the switch in the detection module, and the level of D12 recovers from close to the working communication level to the working communication level... and so on, until the last level (nth level) backlight driver chip sets its main communication module and slave communication module, and the backlight control system enters the normal working mode.
[0037] The present invention can be implemented in other specific forms without departing from its spirit and essential features. For example, the algorithms described in the specific embodiments can be modified, and the system architecture does not depart from the basic spirit of the present invention. Therefore, the current embodiments are regarded as exemplary and non-restrictive in all aspects, and the scope of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning and equivalent scope of the claims are thus included in the scope of the present invention.
Claims
1. A backlight driver chip used in a backlight control system, comprising two bidirectional communication modules and a control module, wherein: The control module is configured to: Setting the two bidirectional communication modules to a signal input mode; detecting the input signal strength of each of the two bidirectional communication modules; as well as One of the two bidirectional communication modules whose input signal strength is greater than a threshold strength is set as a master communication module of the backlight driver chip, and the other of the two bidirectional communication modules is set as a slave communication module of the backlight driver chip.
2. The backlight driver chip according to claim 1, wherein: Each of the two bidirectional communication modules includes a signal input link and a signal output link connected in parallel between the control module and the communication port of the bidirectional communication module, and the bidirectional communication module is set to a signal output mode when the signal output link is valid and is set to a signal input mode when the signal output link is invalid.
3. The backlight driver chip according to claim 1, wherein: The backlight driving chip further includes two detection modules corresponding to the two bidirectional communication modules respectively, and each of the two detection modules includes: a first resistor connected to a communication port of a corresponding bidirectional communication module of the two bidirectional communication modules, and used for setting an initial state of a voltage at the communication port of the corresponding bidirectional communication module; a port bias unit connected in parallel with the first resistor, the port bias unit comprising a switch and a port bias element connected in series between a first end of the first resistor and a second end of the first resistor, the port bias element being used to set a bias state of a voltage at the communication port of the corresponding two-way communication module based on an initial state of a voltage at the communication port of the corresponding two-way communication module when the switch is in a closed state; and The output end is connected to the comparator of the control module, which is used to compare the threshold voltage and the voltage at the communication port of the corresponding two-way communication module to generate a detection result, and the detection result is used to indicate whether the input signal strength of the corresponding two-way communication module is greater than the threshold strength.
4. The backlight driver chip according to claim 3, wherein: The port biasing element is a second resistor or a current source.
5. The backlight driver chip according to claim 3, wherein: The first resistor is connected between the communication port of the corresponding two-way communication module and the ground terminal, and is used to set the initial state of the voltage at the communication port of the corresponding two-way communication module to a low level. Alternatively, the first resistor is connected between the communication port of the corresponding two-way communication module and a preset power supply, and is used to set the initial state of the voltage at the communication port of the corresponding two-way communication module to a high level.
6. The backlight driver chip according to claim 3, wherein: The control module is further configured to: The switches in the two detection modules are controlled to change from a closed state to an open state.
7. The backlight driver chip according to any one of claims 1 to 6, wherein: The control module is further configured to: When the main communication module is set to a signal input mode and the slave communication module is set to a signal output mode, a first control signal is received from a backlight controller or an upper-level backlight driver chip in the backlight control system through the main communication module, and a second control signal based on the first control signal is sent to a lower-level backlight driver chip in the backlight control system through the slave communication module.
8. The backlight driver chip according to claim 7, wherein: The control module is further configured to: When the main communication module is set to signal output mode and the slave communication module is set to signal input mode, a first feedback signal is received from the next-level backlight driver chip through the slave communication module, and a second feedback signal based on the first feedback signal is sent to the previous-level backlight driver chip or the backlight controller through the main communication module.
9. A backlight control system, comprising: Backlight controller; as well as One or more backlight driver chips according to any one of claims 1 to 8.
10. The backlight control system according to claim 9, wherein: The backlight controller and the one or more backlight driver chips are cascaded via a single-line link.