Liquid crystal display device and driving method thereof
AssigneeLG Display Co., Ltd.
InventorsInjae Chung, Kiduk Kim, Euitae Kim, Yongwoo Choi
Life of this patent
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Abstract
A liquid crystal display (LCD) and a method of driving the same are disclosed. The liquid crystal display includes a liquid crystal display panel; a backlight unit; a panel drive circuit; a timing controller; an internal memory; a self-screen drive controller; a scaler unit; a selection unit; an internal power circuit; an external power circuit; and a microprocessor that blocks an output of the external power circuit from being supplied to the scaler unit in a self-screen drive.
Claims18
A liquid crystal display comprising:
- a liquid crystal display panel;
- a backlight unit that provides light to the liquid crystal display panel;
- a data drive circuit that drives data lines of the liquid crystal display panel;
- a gate drive circuit that drives gate lines of the liquid crystal display panel;
- a backlight drive circuit that adjusts a luminance of the backlight unit;
- a timing controller that supplies a video signal to the data drive circuit and generates timing control signals for controlling an operation timing of each of the data drive circuit, the gate drive circuit, and the backlight drive circuit using timing signals;
- an internal memory that stores a first internal video signal for a self-screen drive;
- a self-screen drive controller that generates a dimming signal having a dimming ratio less than a dimming ratio in a normal drive and generates an internal timing signal to extract the first internal video signal from the internal memory;
- a scaler unit that generates an external video signal and an external timing signal for the normal drive;
- a selection unit that supplies one of an output of the self-screen drive controller and an output of the scaler unit to the timing controller in response to a selection signal depending on a driving mode;
- an internal power circuit that generates driving voltages required to drive the data drive circuit, the gate drive circuit, the backlight drive circuit, the timing controller, and the self-screen drive controller;
- an external power circuit that generates a power input to the internal power circuit and generates a power of circuits constituting the scaler unit;
- and
- a microprocessor that blocks an output of the external power circuit from being supplied to the scaler unit to disable an operating of the scaler unit and controls the self-screen drive controller to reduce a luminance of the backlight unit in the self-screen drive,
- wherein the luminance of the backlight unit for the self-screen drive is less than or equal to 10% of the luminance of the backlight unit for the normal drive.
A method of driving a liquid crystal display including a liquid crystal display panel, a backlight unit providing light to the liquid crystal display panel, a data drive circuit driving data lines of the liquid crystal display panel, a gate drive circuit driving gate lines of the liquid crystal display panel, a backlight drive circuit adjusting a luminance of the backlight unit, a timing controller that supplies a video signal to the data drive circuit and generates timing control signals for controlling an operation timing of each of the data drive circuit, the gate drive circuit, and the backlight drive circuit using timing signals, a scaler unit generating an external video signal and an external timing signal for a normal drive, an internal power circuit generating driving voltages required to drive the data drive circuit, the gate drive circuit, the backlight drive circuit, and the timing controller, and an external power circuit that generates a power input to the internal power circuit and generates a power of circuits constituting the scaler unit, the method comprising:
- deciding whether or not a mode signal received from the outside indicates a self-screen drive;
- if the mode signal indicates the self-screen drive, blocking an output of the external power circuit from being supplied to the scaler unit to disable an operating of the scaler unit, generating an internal timing signal to extract a first internal video signal previously stored for the self-screen drive from an internal memory, and generating a dimming signal having a dimming ratio less than a dimming ratio in the normal drive;
- and
- supplying the internal timing signal and the first internal video signal to the timing controller in response to a selection signal for the self-screen drive to display the first internal video signal on the liquid crystal display panel to reduce a luminance of the backlight unit using the dimming signal,
- wherein the luminance of the backlight unit for the self-screen drive is less than or equal to 10% of the luminance of the backlight unit for the normal drive.
Dependencies are inferred from the claim text.