Liquid crystal display device and a method for driving the same

• US 20040183773A1
• Filed: 02/26/2004
• Published: 09/23/2004
• Est. Priority Date: 08/28/2001
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Jang-Kun
• Granted Patent: US 7,692,621 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

Disclosed are a liquid crystal display device and a method for driving the same. After all the gate lines included in each effective display region divided into several regions, are turned on, a light is supplied to a liquid crystal after all the liquid crystals are completely arranged, but the light is not applied to a portion of the effective display regions until all the liquid crystals are completely arranged. The process is repeatedly performed concerning each effective display region. Thus, the poor quality of display image such as image spreading phenomenon of the moving image can be prevented. Also, the light supply time can greatly increase, thereby accomplishing an image display with a high brightness.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display panel assembly having a) a thin film transistor substrate including thin film transistors having gate electrodes, source electrodes and drain electrodes, gate lines connected to the gate electrodes, data lines connected to the source electrodes, and pixel electrodes connected to the drain electrodes, b) a color filter substrate facing to the thin film transistor substrate wherein common electrodes are formed on the color filter substrate, c) a liquid crystal display panel having a liquid crystal interposed between the thin film transistor substrate and the color filter substrate, and d) a printer circuit board for applying a gate driving signal to the gate lines, and for applying a data driving signal to the data lines; and

a back light assembly having i) a signal synchronism part for detecting a gate line to which the gate driving signal is applied to generate an inverter control signal, ii) an inverter for receiving the inverter control signal to generate a lamp driving signal, and iii) at least two lamps parallel disposed under the liquid crystal display panel to be turned on or turned off in response to the lamp driving signal.

2. The liquid crystal display device of claim 1, wherein the inverter control signal generated from the signal synchronism part is a signal to turn off the lamp without supplying an electric power to the lamp during a predetermined period of an arrangement of the liquid crystal, the liquid crystal beginning to be arranged in a direction of an electric field applied to the liquid crystal for the predetermined period after the gate driving signal is applied to the gate line.

3. The liquid crystal display device of claim 1, wherein the predetermined period of the arrangement of the liquid crystal starts when the arrangement of the liquid crystal begins, and ends when the arrangement of the liquid crystal is completed.

4. The liquid crystal display device of claim 1, wherein the gate lines of the liquid crystal display panel are divided into a plurality of groups corresponding to positions of the lamps, the gate lines of each group are turned on sequentially, and a lamp corresponding to each group is turned off in response to the inverter control signal during the predetermined period of the arrangement of the liquid crystal after a last gate line of each group is turned on.

5. The liquid crystal display device of claim 4, wherein the lamp corresponding to each group is turned on during one frame after the predetermined period of the arrangement of the liquid crystal.

6. A method for driving a liquid crystal display device comprising the steps of:

i) applying an electric field to a liquid crystal included in a first region of a liquid crystal display panel to arrange the liquid crystal, the liquid crystal display panel being divided into a plurality of regions;

ii) stopping supplying a light to the liquid crystal during a predetermined period of arranging the liquid crystal included in the first region;

iii) supplying the light to the liquid crystal included in the first region after the predetermined period of arranging the liquid crystal included in the first region; and

iv) repeating the steps ii) and iii) concerning liquid crystals included in other regions of the liquid crystal display panel.