Liquid crystal display panel and controlling circuit
AssigneeShenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorsXianming Zhang, Wenfang Li
Life of this patent
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Abstract
A controlling circuit includes a pulse width modulation (PWM) circuit, a level shifter having a current source therein, a capacitor connected to a current source, an overcurrent protection circuit connected to the level shifter, and a controlling circuit configured to enable or disable a function of overcurrent protection of the overcurrent protection circuit within designated time. The controlling circuit includes a switch device. An input of the switch device connected to an output terminal of the capacitor, and an output terminal of the switch device connected to a controlling terminal of the overcurrent protection circuit.
Claims7
A controlling circuit, comprising:
- a pulse width modulation (PWM) circuit;
- a level shifter, connected to an output terminal of the PWM circuit;
- a current source arranged in the level shifter;
- a capacitor, comprising an input terminal connected to an output terminal of the current source that supplies a constant current to the capacitor;
- an overcurrent protection circuit, connected to an output terminal of the level shifter;
- and
- a controlling circuit, configured to enable or disable a function of overcurrent protection of the overcurrent protection circuit within designated time;
- the controlling circuit comprising a switch device;
- an input of the switch device connected to an output terminal of the capacitor;
- an output terminal of the switch device connected to a controlling terminal of the overcurrent protection circuit;
- the designated time is predetermined time which from the start of boot-up operation or shutdown operation correspond to,
- wherein the switch device is a comparator that comprises a non-inverting terminal connected to the output terminal of the capacitor, an inverting terminal receiving a reference voltage, and an output terminal connected to the overcurrent protection circuit.
A controlling circuit, comprising:
- a pulse width modulation (PWM) circuit;
- a level shifter, connected to an output terminal of the PWM circuit;
- a current source arranged in the level shifter;
- a capacitor, comprising an input terminal connected to an output terminal of the current source that supplies a constant current to the capacitor;
- an overcurrent protection circuit, connected to an output terminal of the level shifter;
- and
- a controlling circuit, configured to enable or disable a function of overcurrent protection of the overcurrent protection circuit within designated time;
- the controlling circuit comprising a switch device;
- an input of the switch device connected to an output terminal of the capacitor;
- an output terminal of the switch device connected to a controlling terminal of the overcurrent protection circuit,
- wherein the switch device is a comparator that comprises a non-inverting terminal connected to the output terminal of the capacitor, an inverting terminal receiving a reference voltage, and an output terminal connected to the overcurrent protection circuit.
A liquid crystal display (LCD) panel comprising an LCD body and a controlling circuit, the controlling circuit comprising:
- a pulse width modulation (PWM) circuit;
- a level shifter, connected to an output terminal of the PWM circuit;
- a current source arranged in the level shifter;
- a capacitor, comprising an input terminal connected to an output terminal of the current source that supplies a constant current to the capacitor;
- an overcurrent protection circuit, connected to an output terminal of the level shifter;
- and
- a controlling circuit, configured to enable or disable a function of overcurrent protection of the overcurrent protection circuit within designated time;
- the controlling circuit comprising a switch device;
- an input of the switch device connected to an output terminal of the capacitor;
- an output terminal of the switch device connected to a controlling terminal of the overcurrent protection circuit,
- wherein the switch device is a comparator that comprises a non-inverting terminal connected to the output terminal of the capacitor, an inverting terminal receiving a reference voltage, and an output terminal connected to the overcurrent protection circuit.
Dependencies are inferred from the claim text.