KR20080004851A - Liquid crystal display device - Google Patents

Abstract

An LCD is provided to reduce power consumption by preventing a gate driver from being driven entirely when a portion of a display area is driven. An LCD panel(100) displays an image by being divided into the first and second display areas(120,130). A panel driver(300) includes the first gate driver(320) for driving the first display area and the second gate driver(330) for driving the second display area. The first gate driver(320) is a gate IC(Integrated Circuit) mounted on the liquid crystal display panel(100). The second gate driver(330) is integrated as an amorphous silicon gate on the liquid crystal display panel(100).

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is a block diagram schematically illustrating a conventional liquid crystal display.

2 is a schematic diagram illustrating a configuration and a signal supply form of a liquid crystal display panel according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: liquid crystal display panel 120: first display area

130: second display area 300: panel driver

310: timing controller 320: first gate driver

330: second gate driver 340: data driver

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device with reduced power consumption.

BACKGROUND ART Liquid crystal display devices, which are used as display devices for televisions, computers, and portable terminals, generally have two substrates on which the field generating electrodes are formed so that the surfaces on which the two electrodes are formed face each other. After injecting the liquid crystal in between, the liquid crystal molecules are moved by an electric field generated by applying a voltage to the two electrodes, thereby representing an image by the transmittance of light that varies accordingly.

1 is a plan view illustrating a conventional liquid crystal display device.

Referring to FIG. 1, a conventional liquid crystal display device drives a liquid crystal display panel 1, a gate driver 3 for driving a gate line of the liquid crystal display panel 1, and a data line of the liquid crystal display panel 1. And a timing controller 5 for controlling the data driver 4, the gate driver 3, and the data driver 4.

Here, the liquid crystal display for a mobile phone may include an amorphous silicon gate to activate a menu display region defined on a portion of the liquid crystal display panel which displays a battery remaining capacity, a current time, a date, a user's name, various menus, and the like; The gate signal is supplied to the liquid crystal display panel through the gate driver 3 formed of “ASG”. Here, the gate driver 3 formed of the ASG is formed in a latch structure so that the entire driving unit is driven during driving. Therefore, in order to activate the menu display area, the entire gate driver 3 formed of the ASG must be driven, which consumes a lot of power.

In order to achieve the above technical problem, the present invention relates to a liquid crystal display device in which a gate driver for dividing and driving a gate line into two parts is formed according to a display area to reduce power consumption.

In order to achieve the above technical problem, the present invention provides a liquid crystal display panel which is divided into first and second display areas to display an image, a first gate driver and a second display area to drive the first display area. A liquid crystal display device including a panel driver including a second gate driver is provided.

In more detail, the first gate driver is a gate integrated circuit mounted on the liquid crystal display panel.

In addition, the second gate driver is formed on the liquid crystal display panel with an amorphous silicon gate.

Other objects and features of the present invention in addition to the above object will become apparent from the description with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIG. 2.

2 is a schematic diagram illustrating a configuration and a signal supply form of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the liquid crystal display according to the present invention is divided into first and second display areas 120 and 130 to display an image, and to drive the first display area 120. The panel driver 300 includes a first gate driver 320 and a second gate driver 330 for driving the second display area 130.

In detail, the liquid crystal display panel 100 may include a first display area 120 representing a main image such as a still image / video, and a still image such as a battery remaining capacity, a current time, a date, a user's name, and various menus. It is divided into the second display area 130.

The first display area 120 implements at least one of the still image and the moving image in the full color mode. The first display area 120 is connected to the thin film transistor TFT and the thin film transistor TFT formed at the intersection of the gate line 1GL and the data lines DL of the first display area 120, respectively. Liquid crystal cells Clc arranged in a matrix form are provided.

The thin film transistor TFT supplies data from the data lines DL1 to DLm to the liquid crystal cell Clc in response to a scan signal from the gate lines 1GL1 to 1GLj of the first display area 120. The liquid crystal cell Clc is configured of a pixel electrode connected to the thin film transistor TFT and a common electrode constituting the pixel electrode. Accordingly, the excell may be equivalently represented by the liquid crystal capacitor Clc. The liquid crystal cell includes a storage capacitor Cst for maintaining pixel data charged in the liquid crystal capacitor Clc until the next data is charged.

Since the second display area 130 displays a still image, for example, a still image such as the current time, date, day of the week, antenna, remaining battery amount, etc. displayed on the portable terminal, the second display area 130 is implemented as compared with the first display area 120. It is implemented in at least a small number of modes. Like the first display area 120, the second display area 130 is a thin film transistor TFT formed at the intersection of the gate lines 2GL and the data lines DL of the second display area 130. ), Liquid crystal cells Clc connected to the thin film transistor TFT, and a storage capacitor Cst.

The thin film transistor TFT supplies pixel data from the data lines DL1 to DLm to the liquid crystal cell Clc in response to gate signals from the gate lines 2GL1 to 2GLi of the second display area 130. The liquid crystal cell Clc is configured of a pixel electrode connected to the thin film transistor TFT and a common electrode constituting the pixel electrode. Accordingly, the excell may be equivalently represented by the liquid crystal capacitor Clc.

The panel driver 300 includes a data driver 340 for driving a data line of the liquid crystal display panel 100, a timing controller for supplying signals for controlling the first and second gate drivers 320 and 330 and the data driver 340. 310. The panel driver 300 further includes a power supply unit (not shown) for supplying gate on / off voltages to the first and second gate drivers 320 and 330.

The power supply unit generates gate on / off voltages for driving the gate lines 1GL and 2GL in the first and second display regions 120 and 130 and supplies them to the first and second gate drivers 320 and 330. In addition, when the first display area 120 or the second display area 130 is displayed, the power supply may selectively supply a gate on / off voltage to only one of the first and second gate drivers 320 and 330. .

The timing controller 310 supplies the pixel data signals R, G, and B input from the outside to the data driver 340. In addition, the timing controller 310 controls the first and second gate drivers 320 and 330 and the data driver 340 in response to control signals H, V, DE, and CLK input from the outside. (GCS1, GCS2) and data control signal DCS are generated.

The gate control signals GCS1 and GCS2 include a gate start pulse GSP, a gate shift clock signal GSC, a gate output enable signal GOE, and the like. The data control signals DCS include a source start pulse SSP, a source shift clock signal SSC, a source output enable signal SOE, and the like.

The data driver 340 may output pixel voltage signals of one horizontal line for each horizontal period H1, H2, ... in response to the data control signals DDC from the timing controller 310. DLm). That is, the data driver 340 supplies the pixel voltage signal of one horizontal line for each horizontal period to the data line DL of the first display area 120 by using the first frame frequency, for example, 60 Hz. . The data driver 340 supplies the pixel voltage signal of one horizontal line to the data line DL of the second display area 130 by using the second frame frequency lower than the first frame frequency.

The first gate driver 320 drives the gate lines 1GL of the first display area 120 of the liquid crystal display panel 100, and the second gate driver 330 is the second of the liquid crystal display panel 100. The gate lines 2GL of the display area 130 are driven.

The first gate driver 320 is connected to the gate lines MGL1 to MGLj of the first display area 120 every horizontal period H in response to the first gate control signals GCS1 from the timing controller 310. The gate-on voltage VON is sequentially supplied. Accordingly, in the first gate driver 320, the thin film transistor TFT connected to the gate lines MGL1 to MGLj of the first display area 120 is a unit of the gate line 1GL of the first display area 120. To be driven. The first gate driver 320 is formed of a gate integrated circuit (hereinafter, referred to as an “IC”) and is mounted on the liquid crystal display panel 100 in a chip on glass (COG) manner.

The second gate driver 330 sequentially supplies scan pulses to the gate lines SGL1 to SGLi of the second display area 130 in response to the second gate control signals GCS2 from the timing controller 310. do. Accordingly, in the second gate driver 330, the thin film transistor TFT connected to the gate lines SGL1 to SGLi of the second display area 130 is a unit of the gate line 2GL of the second display area 130. To be driven. Here, the second gate driver 330 is formed of ASG and is formed at one edge of the second display area 130 on the liquid crystal display panel 100.

The data driver 340 is mounted on one of the edges of the liquid crystal display panel 100 using the data IC on the liquid crystal display panel 100 to synchronize the first and second data lines through the data line DL in synchronization with the data control signal DCS. Image signal voltages are applied to the second display regions 130.

Meanwhile, in the liquid crystal display according to the exemplary embodiment of the present invention, the first gate driver 320 and the data driver 340 are integrated with a single IC. The IC is mounted on the liquid crystal display panel 100 by the COG method. In this case, the timing controller 310 and the power supply unit may be integrated in the IC.

As described above, the liquid crystal display according to the present invention includes a gate driver for dividing and driving the display area of the liquid crystal display panel, thereby preventing the entire gate driver from being driven when driving a portion of the display area, thereby increasing power consumption. Can be reduced.

Although the detailed description of the present invention described above has been described with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art, those skilled in the art, described in the claims below It will be understood that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (3)

A liquid crystal display panel divided into first and second display regions to display an image; And a panel driver including a first gate driver for driving the first display area and a second gate driver for driving the second display area. The method of claim 1, And the first gate driver is a gate integrated circuit mounted on the liquid crystal display panel. The method of claim 1, And the second gate driver is integrally formed on the liquid crystal display panel with an amorphous silicon gate.

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