LCD device driver circuit, driving method, and LCD device
View Patent ↗A driver circuit of a liquid crystal display (LCD) device includes a drive line driving a lightbar of the LCD device. A discharge module and a switch module are in series connection between the drive line and a ground end of the LCD device driver circuit in sequence; a starting signal sent by the LCD device is coupled to the switch module. When the starting signal is an OFF signal, the switch module is turned on, and when the starting signal is an ON signal, the switch module is turned off.
1. A driver circuit of a liquid crystal display (LCD) device, comprising:
a drive line driving a lightbar of the LCD device;
wherein a discharge module and a switch module are in series connection between the drive line and a ground end of the LCD device driver circuit in sequence, a starting signal sent by the LCD device is coupled to the switch module;
wherein a capacitor is in parallel connection to the discharge module and the switch module between the drive line and the ground end of the LCD device driver circuit, the capacitor further being connected to the drive line between the discharge module and the lightbar of the LCD device;
wherein when the starting signal is an OFF signal, the switch module is turned on, and when the starting signal is an ON signal, the switch module is turned off, wherein the discharge module is a plurality of discharge resistors that are connected in parallel, a first end of each of the discharge resistors is directly connected to the drive line, and a second end of each of the discharge resistors is coupled to a same terminal of the switch module, the discharge module discharging the capacitor in response to the OFF signal.
2. The driver circuit of the liquid crystal display (LCD) device of claim 1 , wherein the switch module comprises a first controllable switch in series connection between the discharge module and the ground end of the LCD device driver circuit, and a monitoring unit coupled to a control end of the first controllable switch;
wherein the monitoring unit drives the first controllable switch to be on when the LCD device sends the OFF signal, and the monitoring unit drives the first controllable switch to be off when the LCD device sends the ON signal.
3. The driver circuit of the liquid crystal display (LCD) device of claim 2 , wherein the monitoring unit comprises a second controllable switch coupled to the ground end of the LCD device driver circuit, a divider resistor coupled to the second controllable switch, and a reference voltage coupled to the divider resistor; a control end of the second controllable switch is coupled to the starting signal;
wherein the OFF signal sent by the LCD device is a low-level signal, and the ON signal sent by the LCD device is a high-level signal; the first controllable switch and the second controllable switch are driven to turn on by the low-level signal.
4. The driver circuit of the liquid crystal display (LCD) device of claim 2 , wherein the monitoring unit comprises a divider resistor coupled to the ground end of the LCD device driver circuit, a second controllable switch coupled to the divider resistor, and a reference voltage coupled to the second controllable switch; a control end of the second controllable switch is coupled to the starting signal;
wherein the OFF signal sent by the LCD device is a low-level signal, and the ON signal output by the LCD device is a high-level signal; the first controllable switch is driven to turn on by the low-level signal, and the second controllable switch is driven to turn on by the high-level signal.
5. The driver circuit of the liquid crystal display (LCD) device of claim 2 , wherein the monitoring unit comprises a divider resistor coupled to the ground end of the LCD device driver circuit, a second controllable switch coupled to the divider resistor, and a reference voltage coupled to the second controllable switch; a control end of the second controllable switch is coupled to the starting signal by a logic inverter;
wherein the OFF signal sent by the LCD device is a low-level signal, and the ON signal sent by the LCD device is a high-level signal; the first controllable switch and the second controllable switch are driven to turn on by the high-level signal.
6. The driver circuit of the liquid crystal display (LCD) device of claim 1 , wherein resistance value of the discharge resistor is a 100 KΩ.
7. A driving method of a driver circuit of a liquid crystal display (LCD) device, comprising:
A: connecting a discharge module and a switch module in series between a drive line and a ground end of an LCD device driver circuit in sequence, wherein the discharge module is a plurality of discharge resistors that are connected in parallel, a first end of each of the discharge resistors is directly connected to the drive line, and a second end of each of the discharge resistors is coupled to a same terminal of the switch module, wherein a capacitor is in parallel connection to the discharge module and the switch module between the drive line and the ground end of the LCD device driver circuit, the capacitor further being connected to the drive line between the discharge module and the lightbar of the LCD device, the discharge module discharging the capacitor in response to the OFF signal; and
B: controlling the switch module to turn on when the LCD device driver circuit is powered off, and controlling the switch module to turn off when the LCD device driver circuit is powered on.
8. The driving method of the driver circuit of the liquid crystal display (LCD) device of claim 7 , wherein in the step A, the switch module comprises a first controllable switch in series connection between the discharge module and the ground end of the LCD device driver circuit, and a monitoring unit coupled to a control end of the first controllable switch;
in the step B, when the LCD device driver circuit is powered off, the monitoring unit drives the first controllable switch to turn on; when the LCD device driver circuit is powered on, the monitoring unit drives the first controllable switch to turn off.
9. A liquid crystal display (LCD) device, comprising:
an LCD device driver circuit;
wherein the LCD device driver circuit comprises a drive line driving a lightbar of the LCD device, a discharge module and a switch module are in series connection between the drive line and a ground end of the LCD device driver circuit in sequence; a starting signal sent by the LCD device is coupled to the switch module;
wherein a capacitor is in parallel connection to the discharge module and the switch module between the drive line and the ground end of the LCD device driver circuit, the capacitor further being connected to the drive line between the discharge module and the lightbar of the LCD device;
wherein when the starting signal is an OFF signal, the switch module is turned on, and when the starting signal is an ON signal, the switch module is turned off, wherein the discharge module is a plurality of discharge resistors that are connected in parallel, a first end of each of the discharge resistors is directly connected to the drive line, and a second end of each of the discharge resistors is coupled to a same terminal of the switch module, the discharge module discharging the capacitor in response to the OFF signal.
10. The liquid crystal display (LCD) device of claim 9 , wherein the switch module comprises a first controllable switch in series connection between the discharge module and the ground end of the LCD device driver circuit, and a monitoring unit coupled to a control end of the first controllable switch;
wherein the monitoring unit drives the first controllable switch to be on when the LCD device sends the OFF signal, and the monitoring unit drives the first controllable switch to be off when the LCD device sends the ON signal.
11. The liquid crystal display (LCD) device of claim 10 , wherein the monitoring unit comprises a second controllable switch coupled to the ground end of the LCD device driver circuit, a divider resistor coupled to the second controllable switch, and a reference voltage coupled to the divider resistor; a control end of the second controllable switch is coupled to the starting signal;
wherein the OFF signal sent by the LCD device is a low-level signal, and the ON signal sent by the LCD device is a high-level signal; the first controllable switch and the second controllable switch are driven to turn on by the low-level signal.
12. The liquid crystal display (LCD) device of claim 10 , wherein the monitoring unit comprises a divider resistor coupled to the ground end of the LCD device driver circuit, a second controllable switch coupled to the divider resistor, and a reference voltage coupled to the second controllable switch; a control end of the second controllable switch is coupled to the starting signal;
wherein the OFF signal sent by the LCD device is a low-level signal, and the ON signal output by the LCD device is a high-level signal; the first controllable switch is driven to turn on by the low-level signal, and the second controllable switch is driven to turn on by the high-level signal.
13. The liquid crystal display (LCD) device of claim 10 , wherein the monitoring unit comprises a divider resistor coupled to the ground end of the LCD device driver circuit, a second controllable switch coupled to the divider resistor, and a reference voltage coupled to the second controllable switch; a control end of the second controllable switch is coupled to the starting signal by a logic inverter;
wherein the OFF signal sent by the LCD device is a low-level signal, and the ON signal sent by the LCD device is a high-level signal; the first controllable switch and the second controllable switch are driven to turn on by the high-level signal.
14. The liquid crystal display (LCD) device of claim 9 , wherein resistance value of the discharge resistor is 100 KΩ.