KR20100066120A - Gate start pulse signaling method for liquid crystal display device - Google Patents

Abstract

PURPOSE: A gate start pulse providing method for a rotation driving of a liquid crystal display device is provided to expand a product application range of the liquid crystal display device capable of watching an image of a normal configuration in case of arranging with 180-degree rotating. CONSTITUTION: A timing controller creates a gate start pulse(st1). The timing controller selects a first circuit loop for a normal indication of an image or a second circuit loop for a 180-degree rotating indication with sanctioning an external selection signal to a loop selector according to a driving method selection of a liquid crystal panel(st2). The timing controller outputs the gate start pulse to a method corresponding to the circuit loop selected with the loop selector(st3).

Description

Gate start pulse application method for rotational driving of liquid crystal display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate start pulse applying method for rotating a liquid crystal display device. Particularly, a gate start pulse applying for rotating driving a liquid crystal display device capable of performing normal image display even when the liquid crystal panel is rotated 180 degrees. It is about a method.

Among the display devices, in particular, liquid crystal displays have advantages of small size, thinness, and low power consumption, and are used as notebook computers, office automation devices, and audio / video devices. In particular, an active matrix liquid crystal display device using a thin film transistor (hereinafter referred to as "TFT") as a switch element is suitable for displaying a dynamic image.

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.

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 is commonly referred to as a timing controller and uses a control signal input from an external drive system such as a graphics card to control the source driver 18 and the plurality of gates. A control signal for driving the gate driver 20 composed of driver integrated circuits is generated. 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. Reference voltages are set by the producer 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 is a gate driver for controlling on / off of thin film transistors (TFTs) arranged on the liquid crystal panel 2 in response to control signals input from the timing controller 12. A signal is output, and the thin film transistors TFT on the liquid crystal panel 2 are sequentially lined by enabling the gate wirings GL1 to GLn on the liquid crystal panel 2 sequentially by one horizontal synchronizing time. By driving, the analog image signals supplied from the source driver 18 are applied to the pixels connected to the thin film transistors TFTs.

The power supply voltage generator 14 supplies operating power of each component and generates and supplies a common electrode voltage of the liquid crystal panel 2.

Although not shown, the apparatus further includes a backlight unit having one or more lamps to supply light to the liquid crystal panel 2.

Here, the operation of the gate driver 20 will be described in more detail. The gate driver 20 is input with a shift register driven through a gate start pulse (GSP) input corresponding to a carry signal. A plurality of stages including a level shifter and an output buffer for boosting a voltage are generated, and the gate driving signals are generated in response to the gate start pulse GSP to generate the gate lines GL1 to. Output to GLn).

However, the liquid crystal display device needs to apply the finished liquid crystal panel to a product rotated by 180 degrees depending on the case design or other needs for mounting the liquid crystal panel. In this case, a normal image should be displayed. .

However, as described above, in the general liquid crystal display, the application direction of the gate start pulse GSP is fixed, and thus it is impossible to display a normal image.

That is, referring to FIG. 3, in the general liquid crystal display device, the gate start pulse GSP is output from the first signal input / output terminal 32 of the timing controller 30 and first applied to the first gate driver GD1. Thereafter, the gate start pulse GSP is transferred from the first gate driver GD1 to the second gate driver GD2, and in this manner, the gate start pulse GSP is sequentially transmitted from the first gate driver GD1 to the fourth gate driver GD4. do. In this case, the gate start pulse GSP is connected to the second signal input / output terminal 34 of the timing controller 30 again through a line (wire on glass) line formed on the liquid crystal panel 40. It has a circuit loop. In this case, the second signal input / output terminal 34 is a normal ground terminal GND.

Accordingly, the gate driving signal is sequentially output from the first gate driver GD1 according to the application order of the gate start pulse GSP, and finally the gate driver signal is output from the fourth gate driver GD4. Images are sequentially written from the top to the bottom of the liquid crystal panel 40 according to the output order of the driving signals.

That is, since the image data is sequentially input from the upper portion of the liquid crystal panel 40 to the lower direction to display a complete image, the image is also rotated 180 degrees when the liquid crystal panel 40 is rotated 180 degrees. As a result, a normal image cannot be displayed in a state where the liquid crystal panel is rotated 180 degrees by a conventional liquid crystal display device.

The present invention has been made to solve the above problems, and provides a method for applying a gate start pulse (GSP) for rotating the liquid crystal display device to display a normal image even when the liquid crystal panel is rotated 180 degrees. It aims to do it.

In order to achieve the above object, the present invention includes the steps of generating a gate start pulse (GSP) is applied to the gate driver to instruct to generate a gate driving signal to the liquid crystal panel; Selecting a circuit loop through which the gate start pulse (GSP) is transmitted to the gate driver; A method of applying a gate start pulse for rotating a liquid crystal display device, the method including outputting the gate start pulse (GSP) to the selected circuit loop.

In the gate start pulse application method, the circuit loop includes a first circuit loop in which the gate start pulse (GSP) is connected from the first signal input / output terminal to the second signal input / output terminal sequentially via the gate driver and the liquid crystal panel. Wow; The gate start pulse GSP includes a second circuit loop connected from the second signal input / output terminal to the first signal input / output terminal sequentially through the liquid crystal panel and the gate driver.

In the gate start pulse applying method, each of the first circuit loop and the second circuit loop further comprises a source driver for outputting image data to the liquid crystal panel between the first signal input and output terminals and the gate driver. It features.

In the gate start pulse applying method, each of the first circuit loop and the second circuit loop may further include a flexible flat cable (FFC) between the first signal input / output terminal and the source driver.

In the gate start pulse application method, the gate driver includes a plurality of gate drivers including first gate drivers to s gate drivers GD1 to GDs, and the first circuit loop includes the GD1, A loop connected to the second signal input / output terminal sequentially through GD2, .., GDs and the liquid crystal panel, and the second circuit loop is connected to the liquid crystal panel and the GDs, GD (s) from the second signal input / output terminal. -1), ..., GD1 and a loop connected to the first signal input and output terminals.

In the gate start pulse applying method, the first signal input / output terminal and the second signal input / output terminal to which the gate start pulse GSP is output are configured in the same circuit unit.

In the gate start pulse application method, the circuit unit is a timing control unit.

In the gate start pulse application method, the gate start pulse GSP is transmitted through a LOG wiring on the liquid crystal panel.

According to the present invention having the above characteristics, both the normal arrangement and the 180-degree rotational arrangement of the liquid crystal display can view the image of the normal composition has the advantage of extending the product application range of the liquid crystal display device.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 4 is a conceptual view illustrating a method for applying a gate start pulse (GSP) for rotating a liquid crystal display according to a first embodiment of the present invention, and the gate gate start pulse to be applied during normal driving and 180 degree rotation driving. The concept of circuit loop selection for GSP) is illustrated.

First, in the present invention, when the liquid crystal panel 110 is applied to a product in a 180-degree rotated state, an image to be displayed must be displayed in a normal state so that the image can be sequentially recorded on the liquid crystal panel 110. When the writing position is reversed up and down, the normal image can be viewed even in the liquid crystal panel 110 rotated 180 degrees.

That is, referring to the liquid crystal panel 110 shown in FIG. 4, conventionally, image data is sequentially written from the top end of the liquid crystal panel 110, and finally, the image data reaches the bottom end of the liquid crystal panel 110. Was the way it was filled out. Therefore, even when the liquid crystal panel 110 is rotated 180 degrees, the image data should be written sequentially from the top end to the bottom end of the liquid crystal panel in the rotated state, so that normal viewing of the image may be possible.

In other words, in order to view a normal image on the liquid crystal panel rotated 180 degrees, image data is written from the lowest end of the liquid crystal panel 110 without being rotated 180 degrees as shown in FIG. There is a need for a driving method in which image data is sequentially written up to the top end of 110.

Accordingly, in the present invention, when the output order of the gate driving signals outputted from the plurality of gate drivers GD1 to GD4 to the liquid crystal panel 110 to determine the writing position of the image data is reversed, the above-described 180 degree rotational driving is possible. To this end, the 180 degree rotational drive is realized by converting the loop of the gate start pulse GSP indicating the output of the gate driving signal in the reverse order.

To this end, a circuit loop in which the gate start pulse GSP generated by the timing controller 130 is transmitted by an external selection signal OPTN is generated in the timing controller 130 which generates and provides the gate start pulse GSP. The loop selector 136 can be configured.

The loop selector 136 displays the image displayed on the liquid crystal panel 110 by the external selection signal OPTN in a normal state or rotated 180 degrees with reference to the drawing of FIG. 4. A first circuit loop Loop1 for displaying a normal image and a 180-degree rotation display for an image according to the selection of the loop selector 136 by the external selection signal OPTN. Two loops (Loop2) are determined.

Here, the first circuit loop Loop1 may be formed of the first gate driver GD1, the second gate driver GD2, and the third gate driver GD3 from the first signal input / output terminal 132 of the timing controller 130. And a second signal input / output terminal 134 connected through the fourth gate driver GD4 and the liquid crystal panel 110 in order, and the second circuit loop Loop2 is the second signal input / output terminal 134. From the liquid crystal panel 110, the fourth gate driver GD4, the third gate driver GD3, the second gate driver GD2, the first gate driver GD1 and the first signal input / output terminal 132 It is a loop connected in order. That is, the gate start pulse (GSP) transmission paths of the first circuit loop Loop1 and the second circuit loop Loop2 are in reverse order.

Hereinafter, a method of applying a gate start pulse (GSP) for rotating driving the liquid crystal display according to the first embodiment of the present invention, which is realized through the characteristics of the above configuration, will be described with reference to the method flow diagram of FIG. 5.

First, the timing controller 130 generates the gate start pulse GSP. (St1) In this case, the gate start pulse GSP is configured with respect to the first to fourth gate drivers GD1 to GD4. A carry signal instructing to generate and output a gate driving signal to be applied to the liquid crystal panel 110.

Next, according to the driving method selection of the liquid crystal panel 110, the external selection signal OPTN is applied to the loop selector 136 so that the first circuit loop Loop1 or 180 of the image is displayed. A second circuit loop (Loop2) is selected for the rotation display. (St2)

Thereafter, the timing controller 130 outputs the gate start pulse GSP in a manner corresponding to the circuit loop selected by the loop selector 136. (st3)

In this case, when the first circuit loop Loop1 for normal display of the image is selected by the loop selector 136, the gate start pulse GSP is the first signal input / output terminal 132 of the timing controller 130. The first gate driver GD1, the second gate driver GD2, the third gate driver GD3, and the fourth gate driver GD4 are sequentially transmitted to the liquid crystal panel 110. In response to the gate driving signals sequentially applied from the first to fourth gate drivers GD1 to GD4, the image in the normal state is displayed.

In addition, when the second circuit loop Loop2 is selected by the loop selector 136 to display the rotation of the image 180 degrees, the gate start pulse GSP is the second signal input / output terminal of the timing controller 130. 134 is first outputted to the fourth gate driver GD4, and then sequentially transferred to the third gate driver GD3, the second gate driver GD2, and the first gate driver GD1, respectively. The gate driving units GD1 to GD4 output the gate driving signals to the liquid crystal panel 110 in the reverse order, thereby displaying an image rotated 180 degrees on the liquid crystal panel 110.

In addition, the first circuit loop Loop1 and the second circuit loop Loop2 output image data to the liquid crystal panel 110 between the first signal input / output terminal 132 and the first gate driver GD1, respectively. It may be configured to further include a source driver (not shown), in particular may further comprise a flexible flat cable (FFC) between the first signal input and output terminal 132 and the source driver.

FIG. 6 is a conceptual view illustrating a method for applying a gate start pulse (GSP) for rotating a liquid crystal display according to a second exemplary embodiment of the present invention, wherein the gate driver is formed at both ends of the liquid crystal panel 110. The concept of selecting a circuit loop for applying gate start pulse (GSP) to be applied during normal driving and 180 degree rotation driving in a double bank type liquid crystal display is shown.

In the double bank type, a 180 degree rotational driving may be performed by the same configuration and operation method as that of the single bank type of the first embodiment. In addition, the gate driver of each of the left and right parts of the liquid crystal panel 110 may be the first L gate driver. To 4L gate driving units GD1L, GD2L, GD3L, and GD4L and 1R gate driving units to 4R gate driving units GD1R, GD2R, GD3R, and GD4R.

Referring to FIG. 6, the image displayed on the liquid crystal panel 110 by the external selection signal OPTN is generated in the timing controller 130 which generates and provides the gate start pulse GSP. The loop selector 136 is configured to display or rotate 180 degrees, and the first circuit loop for normal display of an image by the loop selector 136 by the external selection signal OPTN ( Loop1) and a second circuit loop (Loop2) for displaying a 180 degree rotation of the image are selected.

Here, the first circuit loop Loop1 includes a first L gate driver GD1L, a second L gate driver GD2L, a third L gate driver GD3L, and a first signal input / output terminal 132 of the timing controller 130. A loop connected to the second signal input / output terminal 134 through a fourth 4L gate driver GD4L and the liquid crystal panel 110, and a first signal from the first signal input / output terminal 132 of the timing controller 130; The second signal input / output terminal 134 is connected in order through a gate driver GD1R, a second R gate driver GD2R, a third R gate driver GD3R, a fourth R gate driver GD4R, and the liquid crystal panel 110. Consisting of loops.

In addition, the second circuit loop Loop2 includes the liquid crystal panel 110, the fourth L gate driver GD4L, the third L gate driver GD3L, and the second L gate driver GD2L from the second signal input / output terminal 134. ), A first L gate driver GD1L and a first signal input / output terminal 132, and a loop connected from the second signal input / output terminal 134 to the liquid crystal panel 110 and the fourth R gate driver GD4R. The third R gate driver GD3R, the second R gate driver GD2R, the first R gate driver GD1R, and the first signal input / output terminal 132 are sequentially connected.

As in the first embodiment, the first circuit loop Loop1 and the second circuit loop Loop2 are in the reverse order of the gate start pulse (GSP) transmission paths.

Hereinafter, a method of applying a gate start pulse (GSP) for rotating driving the liquid crystal display according to the second exemplary embodiment of the present invention, which is realized through the features of the above configuration, will be described with reference to the method flowchart of FIG. 5. same.

First, the timing controller 130 generates the gate start pulse GSP. (St1) At this time, the gate start pulse GSP is the first L gate driver to the fourth L gate driver GD1L, GD2L, GD3L, and the like. And a carry signal for generating and outputting a gate driving signal to be applied to the liquid crystal panel 110 with respect to the GD4L) and the first to fourth gate driving units GD1R, GD2R, GD3R, and GD4R.

Next, according to the selection of the driving method of the liquid crystal panel 110, the external selection signal OPTN is applied to the loop selector 136 to allow the first circuit loop Loop1 or 180 degrees of the image to be displayed normally. Select the second circuit loop (Loop2) for rotation display. (St2)

Thereafter, the timing controller 130 outputs the gate start pulse GSP in a manner corresponding to the circuit loop selected by the loop selector 136. (st3)

In this case, when the first circuit loop Loop1 for normal display of the image is selected by the loop selector 136, the gate start pulse GSP is the first signal input / output terminal 132 of the timing controller 130. The second signal input / output terminal is output from the first L gate driver GD1L, the second L gate driver GD2L, the third L gate driver GD3L, the fourth L gate driver GD4L, and the liquid crystal panel 110. The first R gate driver GD1R, the second R gate driver GD2R, the third R gate driver GD3R, and the fourth R gate driver 134 are transmitted from the first signal input / output terminal 132 in order. The second signal input / output terminal 134 is transferred in order from the GD4R) and the liquid crystal panel 110.

Accordingly, the liquid crystal panel 110 is sequentially applied from the first to fourth gate drivers GD1L, GD2L, GD3L and GD4L and the first and fourth gate drivers GD1R, GD2R, GD3R, and GD4R. The normal state image is displayed according to the gate driving signal.

In addition, when the second circuit loop Loop2 is selected by the loop selector 136 to display the rotation of the image 180 degrees, the gate start pulse GSP is the second signal input / output terminal of the timing controller 130. 134 is output from the liquid crystal panel 110, the fourth L gate driver GD4L, the third L gate driver GD3L, the second L gate driver GD2L, the first L gate driver GD1L, and the first signal input / output. The terminal 132 is transmitted in order, and the liquid crystal panel 110, the fourth R gate driver GD4R, the third R gate driver GD3R, and the second R gate driver GD2R are transferred from the second signal input / output terminal 134. ), And are sequentially delivered to the first R gate driver GD1R.

Accordingly, the gate driving signal is reversed from the first to fourth gate drivers GD1L, GD2L, GD3L, and GD4L and the first and fourth gate drivers GD1R, GD2R, GD3R, and GD4R. As a result, the image is rotated 180 degrees, and as a result, the image rotated 180 degrees is displayed on the liquid crystal panel 110.

Further, the first circuit loop Loop1 and the second circuit loop Loop2 are respectively between the first signal input / output terminal 132 and the first L gate driver GD1L and the first signal input / output terminal 132 and the And a source driver (not shown) for outputting image data to the liquid crystal panel 110 between the first R gate driver GD1R. In particular, the first signal input / output terminal 132 and the source may be included. It may be configured to further include a flexible flat cable (FCC) between the driving unit.

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

FIG. 2 is a view schematically illustrating a configuration of a liquid crystal panel among the components of FIG. 1.

3 is a view for explaining a gate start pulse (GSP) applying method of the liquid crystal display according to the prior art;

4 is a conceptual diagram illustrating a method of applying a gate start pulse (GSP) for rotating a liquid crystal display according to a first embodiment of the present invention.

5 is a flowchart illustrating a method of applying a gate start pulse (GSP) for rotation driving of a liquid crystal display device according to the first to second embodiments of the present invention.

6 is a conceptual view illustrating a driving method for explaining a method of applying a gate start pulse (GSP) for rotating a liquid crystal display according to a second exemplary embodiment of the present invention.

<Brief description of the main parts of the drawing>

110: liquid crystal panel 130: timing control unit

132: first signal input / output terminal 134: second signal input / output terminal

136: loop selector

Claims (8)

Generating a gate start pulse (GSP) applied to the gate driver to generate a gate driver signal and output the gate driver signal to the liquid crystal panel; Selecting a circuit loop through which the gate start pulse (GSP) is transmitted to the gate driver; Outputting the gate start pulse GSP to the selected circuit loop Gate start signal applying method for the rotational drive of the liquid crystal display comprising a The method according to claim 1, The circuit loop, A first circuit loop in which the gate start pulse (GSP) is connected from the first signal input / output terminal to the second signal input / output terminal sequentially via the gate driver and the liquid crystal panel; A second circuit loop in which the gate start pulse GSP is connected to the first signal input / output terminal sequentially from the second signal input / output terminal via the liquid crystal panel and the gate driver; Gate start signal applying method for the rotational drive of the liquid crystal display comprising a The method according to claim 2, The first circuit loop and the second circuit loop may further include a source driver for outputting image data to the liquid crystal panel between the first signal input / output terminal and the gate driver, respectively. Gate start signal application method for driving The method according to claim 3, Each of the first circuit loop and the second circuit loop further includes a flexible flat cable (FFC) between the first signal input / output terminal and the source driver. Signal application method The method according to claim 2, The gate driver includes a plurality of gate drivers including first gate drivers to s gate drivers GD1 to GDs, The first circuit loop is a loop connected from the first signal input / output terminal to the second signal input / output terminal sequentially through the GD1, GD2, .., GDs and the liquid crystal panel. And the second circuit loop is a loop connected from the second signal input / output terminal to the liquid crystal panel and the GDs, GD (s-1), ..., GD1 and the first signal input / output terminal. Gate start signal application method for driving of device The method according to claim 2 or 5, wherein The first signal input / output terminal and the second signal input / output terminal to which the gate start pulse (GSP) is output are configured in the same circuit part, and a gate start signal applying method for rotating driving of the liquid crystal display device. The method of claim 6, The circuit unit is a timing control unit, characterized in that the gate start signal applying method for the rotational drive of the liquid crystal display device The method according to claim 2 or 5, wherein The gate start pulse (GSP) on the liquid crystal panel is a gate start signal applying method for the rotational drive of the liquid crystal display device, characterized in that via the LOG wiring is transmitted.

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