KR100194685B1 - Dual mode LCD module and common driver driving method - Google Patents

Abstract

The present invention relates to a method of driving a dual mode liquid crystal module and a common driver, comprising: display means for receiving and displaying a data signal and a common line enable signal to be actually displayed;

Data signal output means for dividing and outputting a data signal to be actually displayed on the display means;

The display means includes an enable signal output means for dividing and outputting a common line enable signal, and by using a dual-mode common driver, the duty ratio of the common signal and the liquid crystal driving voltage are reduced and the breakdown voltage of the process is reduced. The present invention relates to a dual mode liquid crystal module and a common driver driving method.

Description

Dual mode LCD module and common driver driving method

1 is a view showing a single mode liquid crystal module used in the prior art.

FIG. 2 is a diagram illustrating a method of shifting data in a single mode common driver used in a conventional single mode liquid crystal module.

3 is a view showing a dual mode liquid crystal module according to an embodiment of the present invention.

4 is a diagram illustrating a method of shifting data in a dual mode common driver used in a dual mode liquid crystal module according to an exemplary embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

31: upper liquid crystal panel 32: lower liquid crystal panel

33: upper segment driver 330: upper segment driver

34: lower segment driver 340: lower segment driver

35: dual mode common driver 350: dual mode common driver

The present invention relates to a dual mode liquid crystal module and a common driver driving method, and more specifically, to a liquid crystal panel using a common driver driven in a dual mode method. The present invention relates to a dual mode liquid crystal module and a common driver driving method of dividing a into two parts and simultaneously displaying the same.

As thin film transistor liquid crystal displays (TFT-LCDs) become increasingly high definition and large in area, there are various limitations in the driving method. In the conventional 10 ″ thin film transistor liquid crystal display, since the screen is not large, there are many driving margins. However, as the size of 15 ″ or more is increased, various limitations appear in time delay or current driving capability of the signal. In particular, as the length of the gate line becomes longer, the delay of the gate signal increases, causing various problems in image quality such as a shading effect to the left and right of the screen.

Meanwhile, the liquid crystal panel activates each dot mainly by the voltage difference between the common line and the segment line. In this case, data for actual display is input to each segment line. As a common line, a signal for enabling each common line is input periodically. Here, a device for supplying a periodic enable signal to the common line at a liquid crystal driving voltage level is a liquid crystal driving common driver.

Hereinafter, a single mode driving method of a conventional 480 × 400 liquid crystal module and a common driver will be described with reference to the accompanying drawings.

1 is a view showing a conventional single-mode liquid crystal module,

FIG. 2 is a diagram illustrating a method of shifting data in a single mode common driver used in a conventional single mode liquid crystal module.

As shown in FIG. 1, a conventional single mode liquid crystal module is provided.

A liquid crystal panel 11 for receiving and displaying a data signal and a common line enable signal to be actually displayed;

Segment driver unit 12 is configured by connecting the six segment drivers 120 for outputting a data signal to be actually displayed to the liquid crystal panel 11 in series,

The common driver unit 13 configured to connect five serial drivers 130 for outputting a signal for enabling the common line of the liquid crystal panel 11 to the liquid crystal panel 11 is connected in series.

In addition, the single mode liquid crystal module having the configuration as described above operates as follows. In the liquid crystal panel 11, six segment drivers 120 are connected in series by a common line COM1 to COM400 enable signal input from the common driver unit 13 in which five common drivers 130 are connected in series. The data input from the segment driver unit 12 connected and connected to each other is displayed at a point where the segment lines SEG1 to SG480 and the common lines COM1 to COM400 intersect. In this case, the required duty should be at least 1/400, so the input voltage should be divided by 1/21 bias (BIAS).

Therefore, if the voltage difference of each voltage level is set to 1.5V, the liquid crystal drive voltage (VLCD) becomes 1.5 X 21 = 31.5V.

Meanwhile, referring to FIG. 2, a driving method of the single mode common driver 130 will be described. As shown in FIG. 2, in the case of the 80-channel (Chnnel) driver, when the shift direction is determined, the common signal for enabling each common line includes two signal input pins (DL or DR) according to the shift direction. It is input through one of the other pins and becomes the output terminal of the common signal after 80 shifts. In addition, the common signal is output to the common line of the liquid crystal panel 11 through the common driver 130 to enable the corresponding line.

However, since the conventional technology uses a single mode common driver, when the size of the liquid crystal panel is increased, both the duty ratio of the common signal and the liquid crystal driving voltage must be increased, and a high breakdown voltage process is required.

Accordingly, an object of the present invention is to solve the above-described problems, and a dual mode liquid crystal module and a common driver driving method for reducing the duty ratio and liquid crystal driving voltage of a common signal using a dual mode common driver are provided. It is to provide.

As a means for achieving the above object, the configuration of the present invention, the display means for receiving and displaying the data signal and the common line enable signal to be actually displayed, the data signal for dividing and outputting the data signal to be actually displayed on the display means Output means and an enable signal output means for dividing and outputting a common line enable signal to the display means.

As a means for achieving the above object, another configuration of the present invention is a first step of inputting a common line enable signal to one end of the common driver portion, and from the one end of the common driver portion, The common line enable signal input in the first step and the common line enable signal input in the first and second steps, and the second step of simultaneously inputting the common line enable signal to the next terminal in time and simultaneously with the first step. And shifting 1/2 of the number of common lines in the same direction as the input direction.

By the above configuration, the most preferred embodiment that can be easily carried out by those skilled in the art with reference to the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a dual mode liquid crystal module according to an embodiment of the present invention.

As shown in FIG. 3, the dual mode liquid crystal module according to the embodiment of the present invention includes upper and lower liquid crystal panels 31 and 32 for receiving and displaying data signals and common line enable signals to be actually displayed; The upper segment driver unit 33 configured by connecting a plurality of segment drivers 330 to output data signals to be actually displayed on the upper liquid crystal panel 31 in series, and the data signal to be actually displayed on the lower liquid crystal panel 32. A plurality of segment driver 340 outputting a plurality of dual mode common drivers for outputting a common line enable signal to the lower segment driver unit 34 and the upper and lower liquid crystal panels 31 and 32 configured in series. 350 includes a dual mode common driver unit 35 connected in series.

Here, 480 X 400 LCD panels 31 and 32 are used, and each of the 80-channel segment drivers 330 and 340 has 6 at the top and 6 at the bottom, and the 80-channel common driver 350 is at the left. 5 pieces are used to divide the liquid crystal panels 31 and 32 up and down and display them simultaneously.

Next, the operation according to the embodiment of the present invention by the above configuration will be described with reference to the accompanying drawings.

When the power is applied, the common enable signal is simultaneously input to the dual mode common driver unit 35 at two points (described in FIG. 4 below), so that the two common lines of the liquid crystal panels 31 and 32 are simultaneously connected. Is enabled. Referring to FIG. 3, in the first case, when the common enable signal is simultaneously input from the upper direction DL and the center DM of the common driver unit 35, the signal is output to the upper liquid crystal panel 31. The first common line COM1 and the first common line COM201 of the lower liquid crystal panel 32 are simultaneously enabled. In the second case, when the common enable signal is simultaneously input from the lower direction DR and the center DM of the common driver unit 35, the signal is transmitted to the 200th common line COM200 of the upper liquid crystal panel 31. The 200th common line COM400 of the lower liquid crystal panel 32 is simultaneously enabled. Meanwhile, in the first case, when the common line is enabled, the first common line COM1 and the lower liquid crystal panel 32 of the upper liquid crystal panel 31 are separated by the upper segment driver 33 and the lower segment driver 34. Output and display data on the first common line COM201 at the same time, and in the second case, when the common line is enabled, the upper liquid crystal panel 31 of the upper segment driver 33 and the lower segment driver 34 may be disposed. Data is simultaneously displayed and displayed on the 200th common line COM200 and the 200th common line COM400 of the lower liquid crystal panel 32. In the first case, data is displayed while the common enable signal is shifted downward (COM1 → COM200, COM201 → COM400), and in the second case, the common enable signal is shifted upward (COM200 → COM1, COM400 → COM201). By dividing the data, two screens are displayed at the same time. Therefore, the duty of the required common enable signal should be at least 1/200 (the panel of 400 lines is divided into two parts and driven), and the input voltage is 1/15 bias, so the driving voltage (VLCD) is also good. 1.5 X 15 = 22.5V.

Here, the driving method of the dual mode common driver unit 35 will be described in detail with reference to FIG.

4 is a diagram illustrating a method of shifting data in a dual mode common driver used in a dual mode liquid crystal module according to an exemplary embodiment of the present invention.

As shown in FIG. 3 and FIG. 4, when the number of common drivers 350 is odd, the two common signal input terminals DR and DL existing in the common driver 350 positioned in the center of the common driver unit 35 are present. In addition, the middle input terminal 41 may be added to add a common signal input to the middle input terminal DM of the middle input terminal 41 according to the direction DR and DL of the common signal input to the common driver unit 35. The 40th terminal or the 41st terminal of the common driver 350 which is located in the center of the common driver part 35 from 41 is input simultaneously with the common signal input to the common driver part 35. As shown in FIG.

In more detail, the middle input terminal of the common driver 350 positioned in the center of the common driver unit 35 when the common enable signal is input to the common driver unit 35 in the DL direction (see FIG. 3). The common signal input to the middle input terminal DM of 41 is also the common driver unit 35 by the 41st terminal (see FIG. 4) of the common driver 350 positioned in the center of the common driver unit 35. It is input at the same time as the common signal input to). That is, the common enable signal is simultaneously input to two points of the common driver unit 35. Next, in the shift direction of the common enable signal, the following two orders occur simultaneously when viewed on the common line of the liquid crystal panels 31 and 32 in FIG.

(1) COM1 → COM200 (view of two half channel 80 channel common drivers, COM40 in Fig. 4)

(2) COM201 (Next position of two halves of the 80-channel common driver, COM41 in Figure 4) → COM400

When the common enable signal is input to the common driver unit 35 in the DR direction (see FIG. 3), the reverse operation is performed in the reverse order.

That is, another common enable signal is input to the 40th terminal (see FIG. 4) of the common driver 350 positioned in the center of the common driver unit 35, and the shift direction is shown in FIG. On the common line of 31 and 32), the following two orders occur simultaneously.

(1) COM400 → COM201 (viewing the bottom half of the 80 channel common driver, COM41 in Figure 4)

(2) COM200 (Next position of two halves of the 80-channel common driver, COM40 in Figure 4) → COM1

When the number of common drivers 350 is even, the middle input terminal 41 is not necessary.

As described above, the embodiment of the present invention uses a dual mode common driver, thereby reducing the duty ratio of the common signal and the liquid crystal driving voltage, reducing the display time, and reducing the breakdown voltage of the process. Provides a common driver driving method.

This effect of the present invention can be used in a liquid crystal display device.

Claims (3)

A display means comprising an upper liquid crystal panel 31 and a lower liquid crystal panel 32 and receiving and displaying a data signal and a line enable signal to be actually displayed, and an upper portion outputting a data signal to the upper liquid crystal panel 31. And a lower segment driver part 34 for outputting a data signal to the lower liquid crystal panel 32 in synchronization with the data output of the segment driver part 33 and the upper liquid crystal panel 31. Data signal output means for dividing and outputting the data signal to be displayed on the upper liquid crystal panel 31 and the lower liquid crystal panel 32, and common at two points located on the upper and lower panels 31, 32 side An enable signal that simultaneously accepts a line enable signal and outputs a common line enable signal to the upper liquid crystal panel 31 and the lower liquid crystal panel 32 simultaneously. Dual mode liquid crystal module comprising an output means. The dual mode common driver unit 35 is configured by connecting a plurality of dual mode common drivers 350 in series, and when the dual mode common driver 350 is odd, the center of the dual mode common driver unit 35 is formed. The dual mode common driver 350 located in the dual mode type liquid crystal module further has a middle input terminal 41. A first step of inputting a common line enable signal to one end of a common driver section; and a common line enable signal to a terminal next to the center of the common driver section as viewed from one end of the common driver section in time with the first step Shifting the common line enable signal input in the second step and the first and second steps simultaneously, by 1/2 of the number of common lines in the same direction as the common line enable signal is input in the first step A dual mode common driver driving method comprising a third step.