Backlight control system and the backlight driver chip used therein

Abstract

This invention discloses a backlight control system and a backlight driver chip used therein. The backlight driver chip used in the backlight control system includes two bidirectional communication modules and a control module. 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; designate 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 designate the other bidirectional communication module as the slave communication module of the backlight driver chip.

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: set the two bidirectional communication modules to 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 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.

2. The backlight driver chip as described in 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 communication connection ports of the control module and the bidirectional communication module. The bidirectional communication module is set to signal output mode when the signal output link is valid and to signal input mode when the signal output link is invalid.

3. The backlight driver chip as described in claim 1, wherein, The backlight driver chip further includes two detection modules corresponding to the two bidirectional communication modules, each of the two detection modules including: a first resistor connected to the communication connection port of the corresponding bidirectional communication module, used to set the initial state of the voltage at the communication connection port of the corresponding bidirectional communication module; a port biasing unit connected in parallel with the first resistor, the port biasing unit including a switch and a port biasing element connected in series between a first end and a second end of the first resistor, the port biasing element being used to set the bias state of the voltage at the communication connection port of the corresponding bidirectional communication module based on the initial state of the voltage at the communication connection port of the corresponding bidirectional communication module when the switch is in the closed state; and a comparator with its output connected to the control module, used to compare a threshold voltage and the voltage at the communication connection port of the corresponding bidirectional communication module to generate a detection result, the detection result being used to indicate whether the input signal strength of the corresponding bidirectional communication module is greater than the threshold strength.

4. The backlight driver chip as described in claim 3, wherein, The port biasing element is a second resistor or current source.

5. The backlight driver chip as described in claim 3, wherein, The first resistor is connected between the communication connection port and the ground terminal of the corresponding bidirectional communication module, and is used to set the initial state of the voltage at the communication connection port of the corresponding bidirectional communication module to a low level. Alternatively, the first resistor is connected between the communication connection port and the preset power supply of the corresponding bidirectional communication module, and is used to set the initial state of the voltage at the communication connection port of the corresponding bidirectional communication module to a high level.

6. The backlight driver chip as described in claim 3, wherein, The control module is further configured to control the switches in the two detection modules to change from a closed state to an open state.

7. The backlight driver chip as described in any one of claims 1 to 6, wherein, The control module is further configured to: when the main communication module is set to signal input mode and the slave communication module is set to signal output mode, receive a first control signal from the backlight controller or the next-level backlight driver chip in the backlight control system through the main communication module, and send a second control signal based on the first control signal to the next-level backlight driver chip in the backlight control system through the slave communication module.

8. The backlight driver chip as described in 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, receive a first feedback signal from the next-level backlight driver chip through the slave communication module, and send a second feedback signal based on the first feedback signal to the previous-level backlight driver chip or the backlight controller through the main communication module.

9. A backlight control system, comprising: Backlight controller; And one or more backlight driver chips as described in any one of claims 1 to 8.

10. The backlight control system as described in claim 9, wherein, The backlight controller and the one or more backlight driver chips are cascaded via a single-wire link.

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