KR101297243B1 - Liquid crystal display panel, liquid crystal display device and driving method thereof - Google Patents

Abstract

The present invention relates to a liquid crystal panel, a liquid crystal display device, and a method of driving the same, which improve heat generation of a driving drive IC, comprising: a plurality of liquid crystal pixels forming a first horizontal pixel row and a second horizontal pixel row on a substrate; A plurality of data wires connected to the plurality of liquid crystal pixels; A first gate wiring connected to the odd-numbered liquid crystal pixels of the first horizontal pixel column; A second gate wiring connected to the even-numbered liquid crystal pixel of the first horizontal pixel column; A third gate wiring connected to the even-numbered liquid crystal pixel of the second horizontal pixel column; Provided is a liquid crystal panel including a fourth gate wiring connected to an odd-numbered liquid crystal pixel of the second horizontal pixel array, and a liquid crystal display device having the same, wherein data polarity change in the source driver generated in displaying an image of one frame is 1; Since it only occurs once, the power supply of the source driver is reduced, as well as the heat generation phenomenon is improved.

Description

Liquid crystal panel, liquid crystal display device having same and driving method thereof

1 is a block diagram showing a basic configuration of a general liquid crystal display device

Fig. 2 is a view schematically showing the configuration of the liquid crystal panel in the configuration of Fig. 1

3 is a pixel data polarity display diagram for explaining dot-inversion driving in the prior art;

4 is a plan view schematically showing the configuration of the liquid crystal panel 110 according to the present invention.

5 is a configuration diagram showing the configuration of a liquid crystal display device 100 according to the present invention

6A to 6D are time-dependent scan signal / data input display diagrams for explaining a method of driving a liquid crystal display device according to the present invention, respectively.

7 is a flowchart illustrating a method of driving a liquid crystal display according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

110: liquid crystal panel 120: source driver

130: Gate driver 140: Timing controller

A / A: Display Area TFT: Thin Film Transistor

DL1 to DL5: First to fifth data wirings

GL1 to GL8: First to Eighth Gate Wiring

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel, a liquid crystal display device having the same, and a method of driving the liquid crystal display device, and more particularly, to a liquid crystal panel, a liquid crystal display device, and a method of driving the same, which improve the heat generation problem of the driving drive IC.

Among the display devices, a liquid crystal display device applies a voltage to a specific molecular array of liquid crystals and converts the same into a different molecular array, and visually changes the optical properties such as birefringence, optical fluorescence, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. By converting into a display device using a modulation of light by a liquid crystal cell, a conventional liquid crystal display device displays an image corresponding to a video signal by adjusting the light transmittance of the liquid crystal cells on the liquid crystal panel.

FIG. 1 is a block diagram showing a basic configuration of a general liquid crystal display device, and is largely divided into a liquid crystal panel 2 and an LCM driving circuit unit 26 (liquid crystal display module (LCM)).

In each configuration, the interface 10 includes data (RGB Data) and control signals (input clock, horizontal synchronous signal, vertical synchronous signal) input to the LCM drive circuit unit 26 from an external drive system such as a TV system or a personal computer. And a data enable signal and the like are supplied to the timing controller 12. Mainly, LVDS (Low Voltage Differential Signal) interface and TTL interface are used for data and control signal transmission from external drive system. In addition, the interface function may be collected and used together with the timing controller 12 in a single chip.

As shown in FIG. 2, the liquid crystal panel 2 forms a plurality of pixel regions by crossing a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn on a glass substrate. In the region, a thin film transistor TFT and a liquid crystal LC are configured to display an image by input data.

The timing controller 12 includes a source driver 18 including a plurality of source drive integrated circuits and a gate driver 20 including a plurality of gate driver integrated circuits using control signals input from an external driving system such as a graphics card. Generates a control signal to drive. In addition, the data input through the interface 10 is transmitted to the source driver 18.

The reference voltage generator 16 generates reference voltages of a digital to analog converter (DAC) used in the source driver 18. The reference voltages are set by the manufacturer based on the transmittance-voltage characteristics of the panel.

The source driver 18 selects reference voltages of input data in response to control signals input from the timing controller 12, and supplies the selected reference voltage to the liquid crystal panel 2 to control the rotation angle of the liquid crystal molecules. do.

The gate driver 20 performs on / off control of TFTs arranged on the liquid crystal panel 2 in response to control signals input from the timing controller 12. By sequentially enabling the gate wirings GL1 to GLn on the liquid crystal panel 2 by one horizontal synchronizing time, the thin film transistors TFT on the liquid crystal panel 2 are sequentially driven by one line for each source driver. The analog image signals supplied from 18) are applied to the pixels connected to the respective TFTs.

The power supply voltage generating unit 14 supplies the operating power of each of the components and generates and supplies the common electrode voltage of the liquid crystal panel 2.

And a back-light unit (not shown), which includes at least one lamp to supply light to the liquid crystal panel 2.

In order to prevent deterioration of the liquid crystal of each pixel, the liquid crystal display device having the basic configuration as described above typically performs dot-inversion driving, and has a common voltage difference of data distributed to each pixel area. The polarity of the voltage is indicated as shown in FIG. 3.

As shown in FIG. 3, the data polarity applied to each pixel represents a different polarity between adjacent pixels, and the data polarity of each pixel is inverted again every frame.

However, since the dot-inversion outputs the polarity of the data each time the data is output from the source driver (18 in FIG. 1), the output data is negative (-) to positive (+) or bipolar. At the same time, the negative current is rapidly changed from negative to negative, and at the same time, the amount of change in current is also rapidly changed, resulting in a severe heat generation in the source driver 18 due to sudden power consumption.

The present invention has been made to solve the above problems, a liquid crystal panel and a liquid crystal display device and the liquid crystal display that can perform a stable image display by reducing the power consumption in the source driver and improve the heat problem It is an object to provide a method of driving a device.

In order to achieve the above object, the present invention includes a plurality of liquid crystal pixels forming a first horizontal pixel row and a second horizontal pixel row on a substrate; A plurality of data wires connected to the plurality of liquid crystal pixels; A first gate wiring connected to the odd-numbered liquid crystal pixels of the first horizontal pixel column; A second gate wiring connected to the even-numbered liquid crystal pixel of the first horizontal pixel column; A third gate wiring connected to the even-numbered liquid crystal pixel of the second horizontal pixel column; A liquid crystal panel includes a fourth gate wiring connected to an odd-numbered liquid crystal pixel of the second horizontal pixel array.

In the liquid crystal panel, the plurality of data lines may be formed to cross the first to fourth gate lines.

In addition, the present invention, the liquid crystal panel of the above characteristics; A source driver for outputting data to the plurality of data wires; A gate driver configured to output a scan signal to the first to fourth gate wirings; Provided is a liquid crystal display including a timing controller for controlling data transmission to the source driver and data output of the source driver, and controlling output of the scan signal of the gate driver.

In the liquid crystal display device, the source driving part alternately outputs positive data and negative data to the plurality of data lines.

In the liquid crystal display device, the gate driver may simultaneously output a scan signal to two of the first to fourth gate wirings.

In addition, the present invention comprises the steps of simultaneously applying the first scan signal to a plurality of liquid crystal pixels forming a first horizontal pixel column and a second horizontal pixel column; Writing bipolar (+) data into an even-numbered liquid crystal pixel of the first horizontal pixel column and an even-numbered liquid crystal pixel of the second horizontal pixel column in synchronization with the first scan signal; Simultaneously applying a second scan signal to a plurality of liquid crystal pixels forming a third horizontal pixel column and a fourth horizontal pixel column; Writing bipolar (+) data into an even-numbered liquid crystal pixel of the third horizontal pixel sequence and an even-numbered liquid crystal pixel of the fourth horizontal pixel sequence in synchronization with the second scan signal; Simultaneously applying a third scan signal to a plurality of liquid crystal pixels forming the first and second horizontal pixel columns; Writing negative data into the even-numbered liquid crystal pixel of the first horizontal pixel sequence and the odd-numbered liquid crystal pixel of the second horizontal sequence in synchronization with the third scan signal; Simultaneously applying a fourth scan signal to a plurality of liquid crystal pixels forming the third and fourth horizontal pixel columns; And writing negative data into the even-numbered liquid crystal pixel of the third horizontal pixel column and the odd-numbered liquid crystal pixel of the fourth horizontal pixel column in synchronization with the fourth scan signal. do.

In the driving method, the polarity of the data is inverted every frame.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 4 is a schematic plan view showing the configuration of the liquid crystal panel 110 according to the present invention, and includes a plurality of data lines DL1 to DL5 and a plurality of gate lines GL1 to GL8 in a display area A / A on a substrate. ) Are formed to cross each other to define a pixel area. Of course, the data line, the gate line, and the pixel area thereof may have a larger number of configurations, but only the minimum portion (that is, a configuration area of DL1 to DL5 and GL1 to GL8) necessary for description is shown in the drawing.

Each pixel area includes a thin film transistor TFT connected to one of the plurality of data lines DL1 to DL5 and to one of the plurality of gate lines GL1 to GL8. The thin film transistor TFT is connected to the liquid crystal LC through a pixel electrode (not shown). Of course, the data storage capacitor Cst connected to the thin film transistor TFT is configured, but is not shown for convenience of description.

In the liquid crystal panel according to the present invention as shown in the figure, the number of gate wirings configured to drive one horizontal pixel column is two, and one gate wiring provided to one horizontal pixel column drives the odd-numbered liquid crystal pixel. Another gate wiring is configured to drive even-numbered liquid crystal pixels.

That is, in the first horizontal pixel array of FIG. 4, the first and second gate wiring lines GL1 and GL2 are provided, and the first gate wiring GL1 is connected to the odd-numbered liquid crystal pixels of the first horizontal pixel array. The second gate line GL2 is connected to the even-numbered liquid crystal pixel of the first horizontal pixel column.

In addition, in the case of the second horizontal pixel array, third and fourth gate lines GL3 and GL4 are provided, so that the third gate line GL3 is connected to the even-numbered liquid crystal pixel of the second horizontal pixel array and is connected to the fourth. The gate line GL4 is connected to the odd-numbered liquid crystal pixel of the second horizontal pixel column.

Accordingly, the liquid crystal panel according to the present invention forms the liquid crystal panel 110 further comprising a plurality of basic pixel rows using the first horizontal pixel row and the second horizontal pixel row as the basic pixel columns.

5 is a block diagram showing the configuration of the liquid crystal display device 100 according to the present invention including the liquid crystal panel having the above-described characteristics, the liquid crystal panel 110, the source driver 120, the gate driver 130, It includes a timing controller 140.

Configuration and features of the liquid crystal panel 110 are as described with reference to FIG. 4.

The source driver 120 simultaneously outputs image data to the plurality of data wires (DL1 to DL5 of FIG. 4), but outputs only bipolar (+) data for a first time and is continuous with the first time. During this time, the driving is performed to output only negative data. At this time, the sum of the first time and the second time is one frame display time.

The gate driver 130 outputs a scan signal to the gate lines GL1 to GL8 of FIG. 4, and drives the gate signals 130 to simultaneously output the scan signals to all the gate lines GL1 to GL8. Run continuously.

That is, the scan signal input sequence by the gate driver 130 applies a simultaneous scan signal to two gate wirings which are sequentially related to the odd gate wirings GL1, GL3, GL5, and GL7, and then the even gate wiring. A simultaneous scan signal is applied to two gate wirings in sequential order with respect to (GL2, GL4, GL6, GL8).

As shown in FIG. 4, the scan signal application sequence of the liquid crystal panel is shown in FIG. 4, wherein the first scan signal in GL1 and GL3-> the second scan signal in GL5 and GL7 and the third scan in GL2 and GL4. The fourth scan signal is applied to the signal-> (GL6, GL8). In this case, the gate wiring in parentheses means that the scanning wiring is a gate wiring to which the signal is applied at the same time.

The source driver 120 outputs data of positive polarity (+) and data of negative polarity (−) in accordance with the scanning signal application order. The input timing of the first and second scan signals is positive (+). Is output to the data lines DL1 to DL5, and data of negative polarity (-) is output to the data lines DL1 to DL5 at the input timing of the third and fourth scan signals. Then, in the next frame, the data whose polarity is reversed is input again.

The timing controller 140 outputs a control signal capable of controlling the operations of the source driver 120 and the gate driver 130 as described above, and also controls the polarity (+) data of the source driver 120. Image data for output and output of negative data (−) are selected and transferred to the source driver 120.

Hereinafter, a driving method of the liquid crystal display device 100 according to the present invention will be described with reference to the scan signal / data input display diagrams of FIGS. 6A to 6D and the operation flowchart of FIG. 7.

In order to help the understanding of the description, the liquid crystal panel 110 refers to the structure of FIG. 4, and each liquid crystal pixel only displays the input data polarity, not the structure.

First, when the first scan signal SCAN1 is input to the first and third gate lines GL1 and GL3 through the gate driver 130 (see FIG. 5) (st1), the odd-numbered liquid crystal pixels and the first horizontal pixel column are first. The even-numbered liquid crystal pixel of the two horizontal pixel arrays is converted into a data input state, and the bipolar (+) data is output to the data wirings DL1 to DL5 through the source driver 120. (st2) FIG. As in 6a, bipolar (+) data is written in the even-numbered liquid crystal pixels of the first horizontal pixel column and the even-numbered liquid crystal pixels of the second horizontal pixel column.

Next, when the second scan signal SCAN2 is input to the fifth and seventh gate lines GL5 and GL7 through the gate driver 130 (st3), the odd-numbered liquid crystal pixels and the fourth horizontal pixel column of the third horizontal pixel column are input. The even-numbered liquid crystal pixel of the horizontal pixel array is converted into a data input state, and the bipolar (+) data is output to the data wirings DL1 to DL5 through the source driver 120. (st4) FIG. 6B. As described above, bipolar (+) data is also written in the even-numbered liquid crystal pixels of the third horizontal pixel array and the even-numbered liquid crystal pixels of the fourth horizontal pixel array.

Subsequently, when the third scan signal SCAN3 is input to the second and fourth gate lines GL2 and GL4 through the gate driver 130 (st5), the even-numbered liquid crystal pixel of the first horizontal pixel column and the second horizontal pixel are input. The odd-numbered liquid crystal pixels of the pixel column are converted to a data input state, thereby outputting negative data (−) to the data wirings DL1 to DL5 through the source driver 120 (st6). As described above, the negative data is written in the even-numbered liquid crystal pixels of the first horizontal pixel array and the odd-numbered liquid crystal pixels of the second horizontal pixel array.

Finally, when the fourth scan signal SCAN4 is input to the sixth and eighth gate lines GL6 and GL8 through the gate driver 130 (st7), the even-numbered liquid crystal pixel of the third horizontal pixel column and the fourth The odd-numbered liquid crystal pixels of the horizontal pixel array are converted to the data input state, and the negative data is output to the data lines DL1 to DL5 through the source driver 120. (st8) FIG. As in 6d, the negative data is also written in the even-numbered liquid crystal pixels of the third horizontal pixel array and the odd-numbered liquid crystal pixels of the fourth horizontal pixel array.

Since the above operation is performed every frame, it is natural that the polarity of the input data is inverted each frame to implement the dot inversion method.

As described above, the driving method of the liquid crystal display according to the present invention first writes the data of the positive polarity (+) to each liquid crystal pixel first in two horizontal pixel units for one frame display, and then the negative polarity (- Since the data of) is written to each liquid crystal pixel in units of two horizontal pixels, data polarity switching according to image display of one frame occurs only once in the source driver (120 in FIG. 5). Accordingly, the source driver 120 may reduce excessive power consumption due to data polarity switching, thereby providing an effect of improving heat generation.

In addition, the driving method of the liquid crystal display according to the present invention as described above is driven by dividing into two time domains for each data polarity to display an image for one frame, and thus, to maintain a driving speed of 60 Hz, the polarity (+ ) When driving the data writing speed and the negative data writing speed at 120Hz, respectively, the same 60Hz driving effect is provided. Therefore, the image quality provided to the viewer has the same characteristic.

According to the liquid crystal panel according to the present invention as described above, a liquid crystal display device having the same, and a method of driving the liquid crystal display device, the data polarity change in the source driver generated for displaying an image of one frame occurs only once. Therefore, as well as the reduction of power consumption in the source driver, there is an effect that the heat generation phenomenon is improved.

Claims (7)

A plurality of liquid crystal pixels forming a first horizontal pixel row and a second horizontal pixel row on the substrate; A plurality of data wires connected to the plurality of liquid crystal pixels; A first gate wiring connected to the odd-numbered liquid crystal pixels of the first horizontal pixel column; A second gate wiring connected to the even-numbered liquid crystal pixel of the first horizontal pixel column; A third gate wiring connected to the even-numbered liquid crystal pixel of the second horizontal pixel column; A fourth gate wiring connected to the odd-numbered liquid crystal pixel of the second horizontal pixel array Liquid crystal panel comprising a The method according to claim 1, The plurality of data lines may be formed to intersect the first to fourth gate lines. A plurality of liquid crystal pixels forming a first horizontal pixel row and a second horizontal pixel row on a substrate, a plurality of data wires connected to the plurality of liquid crystal pixels, and a second liquid crystal pixel connected to the odd-numbered liquid crystal pixels of the first horizontal pixel row. A first gate wiring, a second gate wiring connected to the even-numbered liquid crystal pixel of the first horizontal pixel column, a third gate wiring connected to the even-numbered liquid crystal pixel of the second horizontal pixel column, and an odd number of the second horizontal pixel column A liquid crystal panel including a fourth gate wiring connected to the liquid crystal pixel; A source driver for outputting data to the plurality of data wires; A gate driver configured to output a scan signal to the first to fourth gate wirings; A timing controller which controls data transmission to the source driver and data output of the source driver and controls the scan signal output of the gate driver; Liquid crystal display comprising a The method according to claim 3, The source driver may alternately output positive data and negative data to the plurality of data lines. The method according to claim 3, And the gate driver outputs a scan signal simultaneously to two gate lines among the first to fourth gate lines. Simultaneously applying a first scan signal to a plurality of liquid crystal pixels forming a first horizontal pixel column and a second horizontal pixel column; Writing bipolar (+) data into an even-numbered liquid crystal pixel of the first horizontal pixel column and an even-numbered liquid crystal pixel of the second horizontal pixel column in synchronization with the first scan signal; Simultaneously applying a second scan signal to a plurality of liquid crystal pixels forming a third horizontal pixel column and a fourth horizontal pixel column; Writing bipolar (+) data into an even-numbered liquid crystal pixel of the third horizontal pixel sequence and an even-numbered liquid crystal pixel of the fourth horizontal pixel sequence in synchronization with the second scan signal; Simultaneously applying a third scan signal to a plurality of liquid crystal pixels forming the first and second horizontal pixel columns; Writing negative data into the even-numbered liquid crystal pixel of the first horizontal pixel column and the odd-numbered liquid crystal pixel of the second horizontal pixel column in synchronization with the third scan signal; Simultaneously applying a fourth scan signal to a plurality of liquid crystal pixels forming the third and fourth horizontal pixel columns; Writing negative data to the even-numbered liquid crystal pixel of the third horizontal pixel sequence and the odd-numbered liquid crystal pixel of the fourth horizontal pixel sequence in synchronization with the fourth scan signal. Liquid crystal display driving method comprising The method of claim 6, Wherein the polarity of the data is inverted every frame.

Images