KR20030073474A - Liquid crystal display - Google Patents

Abstract

PURPOSE: An LCD is provided to perform a timing control by using a universal controller without a specific controller. CONSTITUTION: An LCD includes a timing control portion(500), a signal conversion portion(600), and a gate driving portion. The timing control portion(500) receives an image signal and the first timing signal for controlling an output of the image signal, generates the second timing signal according to the first timing signal, outputs the second timing signal and the image signal to a data driving portion, and generates the first scan start signal and the third timing signal according to the first timing signal. The signal conversion portion(600) generates the second scan start signal and the first power clock according to the first scan start signal and the third timing signal, and outputs the first and the second power clocks. The gate driving portion provides the first power clock and the second power clock to stages of odd numbers and stages of even numbers, respectively and selects selectively plural gate lines according to the output signals of the stages.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

The present invention relates to a liquid crystal display device, and more particularly, to an amorphous liquid crystal display device that can be driven through a general-purpose timing controller.

In general, liquid crystal displays (hereinafter, LCDs) are emerging as next-generation display devices because they are lightweight, compact, have high resolution, low power, and are eco-friendly, and can be full-colored, compared to typical CRT display devices.

Among the liquid crystal display devices currently used, an electrode is formed on two substrates and a thin film transistor for switching a voltage applied to each electrode. The thin film transistor is formed on any one of two substrates.

Here, a liquid crystal display using a thin film transistor (TFT) in the pixel portion is divided into an amorphous type (or amorphous silicon, a-Si) and a polycrystalline type (or poly-silicon, poly-Si), a polycrystalline liquid crystal display device While the device operation can be speeded up and the device can be driven at low power, the manufacturing process of the thin film transistor is complicated. Therefore, a polycrystalline liquid crystal display device is mainly applied to a small display device, and an amorphous liquid crystal display device is largely applied to a large display device such as a notebook PC, an LCD monitor, and an HDTV because of its large area and high yield.

1 is a plan view illustrating a typical amorphous silicon type liquid crystal display device.

Referring to FIG. 1, a typical amorphous-silicon type liquid crystal display device includes a liquid crystal display panel 10 having a pixel array, driving printed circuit boards 36 and 42, and a liquid crystal for providing driving signals to the liquid crystal display panel 10. Flexible printed circuit boards 32 and 38 for electrically connecting the display panel 10 and the driving printed circuit boards 36 and 42 are provided.

The driving printed circuit boards 36 and 42 are a data printed circuit board 36 for driving a data line of the liquid crystal display panel 10 and a gate printed circuit board 42 for driving a gate line of the liquid crystal display panel 10. ). On the other hand, the data printed circuit board 36 is connected to the data line terminal portion of the liquid crystal display panel 10 by the data side flexible circuit board 32, and the gate printed circuit board 42 is the gate side flexible circuit board 38. It is connected to the gate line terminal portion of the liquid crystal display panel by the.

At this time, the data driving chip 34 is formed on the data side flexible circuit board 32 by a COF (CHIP ON FILM) method, and the gate driving chip 40 on the gate side flexible printed circuit board 38 by a COF method. Is formed.

Recently, data driving circuits and gate driving circuits are formed on a glass substrate of a liquid crystal display panel, such as a poly-Si liquid crystal display, to reduce the number of assembly processes in an amorphous (a-Si) liquid crystal display. Is trying to develop technology.

2 is a plan view illustrating an amorphous liquid crystal display in which a gate and a data driving circuit are incorporated in a panel.

Referring to FIG. 2, the amorphous liquid crystal display 90 forms a plurality of data driving chips 61 and gate driving chips 62 in a peripheral area of a display area on a glass substrate 60 on which a pixel array is formed. In this case, output terminals of the plurality of data driving chips 61 are connected to the data lines, respectively, and output terminals of the plurality of gate driving chips 62 are respectively connected to the gate lines. The input terminals of the data driving chip 61 and the gate driving chip 62 are connected to an integrated printed circuit board (not shown) through the flexible printed circuit board 70.

Meanwhile, the flexible printed circuit board 70 includes a driving chip 71 for providing timing signals and image data signals to the data driving chip 61 and the gate driving chip 62 and a common voltage generating chip 72 for generating a common voltage. ) Is mounted.

As such, the structure in which the data driving chip 61 and the gate driving chip 62 are mounted in the glass substrate 60 may reduce manufacturing cost and minimize power loss by integrating the driving circuit.

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal display device that can be implemented through a general timing controller without implementing a separate timing controller that is optimal for an amorphous liquid crystal display device. will be.

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

2 is a plan view illustrating an amorphous liquid crystal display in which a gate and a data driving circuit are incorporated in a panel.

3 is an exploded perspective view of a liquid crystal display according to the present invention.

4 is a plan view illustrating an example of the thin film transistor substrate illustrated in FIG. 3.

5 is a configuration diagram of a shift register constituting the gate driving circuit shown in FIG. 4 described above.

FIG. 6 is a diagram showing a specific circuit configuration of each stage of the shift register shown in FIG.

7 is an output waveform diagram according to FIG. 6 described above.

8A is a waveform diagram illustrating a scan start signal and a shift clock applied to a general shift register, and FIG. 8B is a waveform diagram illustrating a scan start signal and a power clock applied to a shift register according to the present invention.

9 is a diagram for describing a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 10 is a diagram for describing the timing converter of FIG. 9.

FIG. 11 is a diagram for describing a detailed circuit of the timing converter of FIG. 10.

12A to 12D are waveform diagrams for describing scan start signals and shift clocks provided from a general timing controller.

13A and 13B are waveform diagrams for explaining the relationship between the gate shift clock and the gate output.

14A and 14B are waveform diagrams for explaining changes in the scan start signal and the shift clock in response to the trigger of the shift clock.

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

500: timing control unit 600: signal conversion unit

610: timing converter 612: STV selector

614: clock selector 616: trigger edge selector

618: gate signal changing unit 620: level converting unit

700: display substrate 710: signal buffer

720: gate driver 730: data driver

730: source driver 740: liquid crystal display panel

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a display cell array circuit formed on a transparent substrate including a plurality of data lines and a plurality of gate lines crossing the data lines; A liquid crystal display comprising a data driver for outputting a data signal,

Receiving an image signal and a first timing signal for output control of the image signal from an external source, outputting the second timing signal and the image signal generated in response to the first timing signal to the data driving circuit, A timing controller configured to output the first scan start signal and the third timing signal generated in response to the first timing signal;

The second scan start signal generated by converting the timing and level of the first scan start signal, the first power clock generated by converting the timing and level of the third timing signal, and the first power clock are in phase with each other. A signal converter configured to output an inverted second power clock; And

A plurality of stages are cascaded on the transparent substrate, and the odd stage and even stages of the shift register are provided with the first power clock and the second power clock, respectively. The second scan start signal is input to an input terminal, and includes a gate driver that sequentially selects the plurality of gate lines by an output signal of each stage.

According to such a liquid crystal display device, even if a separate timing controller is not implemented for an amorphous liquid crystal display device, it is optimal for an amorphous type liquid crystal display panel by changing the timing and level of a scan start signal and a timing signal provided from a general timing controller. Can provide a signal.

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

3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the liquid crystal display device includes a liquid crystal display panel assembly 100, a backlight assembly 200, a chassis 300, and a cover 400.

The liquid crystal display panel assembly 100 includes a liquid crystal display panel 110, a flexible printed circuit (FPC) 190, and an integrated driving chip 180.

The liquid crystal display panel 110 includes a thin film transistor substrate 120 as a lower substrate, a color filter substrate 130 as an upper substrate, and a liquid crystal layer (not shown) provided therebetween. A display cell array circuit and a gate driving circuit are formed on the thin film transistor substrate 120 by an a-Si thin film process. In addition, the integrated driving chip 180 is attached to the thin film transistor substrate 120. The integrated driving chip 180 is electrically connected to an external circuit board (not shown) by the FPC 190.

Meanwhile, RGB pixels and transparent common electrodes are formed on the color filter substrate 130.

The backlight assembly 200 includes a lamp assembly 220, a light guide plate 240, optical sheets 260, a reflective plate 280, and a mold frame 290.

4 is a plan view illustrating an embodiment of the thin film transistor substrate illustrated in FIG. 3.

Referring to FIG. 4, the thin film transistor substrate 120 is divided into a first region corresponding to the color filter substrate 130 and a second region not corresponding to the color filter substrate 130. The first area includes a display area and a peripheral area, and a plurality of data lines DL extend in a row direction and a plurality of gate lines GL extend in a column direction in the display area. The gate driving circuit 140 connected to the plurality of gate lines GL is integrated in the left peripheral area of the display area.

An integrated driving chip 180 that controls the overall driving of the liquid crystal display panel 110 is mounted in the second region of the thin film transistor substrate 120. The integrated driving chip 180 receives an external image data signal 181a and an external control signal 181b from a circuit board disposed outside the liquid crystal display panel 110, and controls driving of the gate driving circuit 140. Analog pixel data is output to each of the driving control signal GC and the plurality of data lines DL.

In this case, the external connection terminals 181a and 182b of the integrated driving chip 180 are connected to the flexible printed circuit 190 which is one of the interface devices electrically connecting the circuit board and the integrated driving chip 180. do.

Among the plurality of output terminals of the integrated driving chip 180, the driving control signal output terminals GC are connected to the input terminals of the gate driving circuit 140, and the plurality of channel terminals CH are connected to the plurality of data lines DL), respectively. Specifically, the driving control signal output terminals GC include the scan start signal output terminal ST, the first clock output terminal CKV, the second clock output terminal CKVB, the first power supply voltage terminal VOFF or VSS, and Five terminals 114a of the second power supply voltage terminal VON or VDD are included.

Hereinafter, the gate driving circuit formed in the left peripheral area of the liquid crystal display panel will be described in detail with reference to the accompanying drawings.

5 is a configuration diagram of a shift register constituting the gate driving circuit shown in FIG. 4 described above.

Referring to FIG. 5, the gate driving circuit 140 includes one shift register 141 in which a plurality of stages SRC1 to SRCn are cascaded. That is, the output terminal OUT of each stage is connected to the input terminal IN of the next stage, whereby each stage is connected in a dependent manner. The shift register 141 includes n stages SRC1 to SRCn corresponding to the gate lines GL1 to GLn and one dummy stage SRCn + 1. Each stage has an input terminal IN, an output terminal OUT, a control terminal CT, a power clock input terminal CKV, a first power supply voltage terminal VSS, and a second power supply voltage terminal VDD.

The scan start signal ST is input to the input terminal IN of the first stage. Here, the scan start signal ST is a pulse signal synchronized with the vertical synchronization signal from the control unit 182 shown in FIG.

The output signals OUT1 to OUTn of each stage are connected to the corresponding gate lines GL1 to GLn. The first power clock CKV is provided to the odd-numbered stages SRC1 and SRC3, and the second power clock CKVB is provided to the even-numbered stages SRC2 and SRC4. In this case, the first power clock CKV and the second power clock CKVB have phases opposite to each other.

Output signals OUT2, OUT3, OUT4 of the next stages SRC2, SRC3, SRC4 are input to the control terminals CT of the stages SRC1, SRC2, SRC3 as control signals. That is, the control signal input to the control terminal CT becomes a signal delayed by the duty period of its output signal.

Therefore, since the output signals of each stage sequentially have an active period (high state), corresponding gate lines are sequentially selected in the active period of each output signal.

FIG. 6 shows a specific circuit configuration of each stage of the shift register shown in FIG. 5, and FIG. 7 is an output waveform diagram according to FIG.

Referring to FIG. 6, each stage of the shift register 141 includes a pull up unit 142, a pull down unit 144, a pull up driver 146, and a pull down driver 148.

The pull-up unit 142 includes a first NMOS transistor NT1 having a drain connected to the power clock input terminal CK, a gate connected to the third node N3, and a source connected to the output terminal OUT. .

The pull-down unit 144 includes a second NMOS transistor NT2 having a drain connected to the output terminal OUT, a gate connected to the fourth node N4, and a source connected to the first power supply voltage VSS. .

The pull-up driving unit 146 includes a capacitor C and third to fifth NMOS transistors NT3 to NT5. The capacitor C is connected between the third node N3 and the output terminal OUT. In the third transistor NT13, a drain is connected to the second power supply voltage VDD, a gate is connected to the input terminal IN, and a source is connected to the third node N3. In the fourth transistor NT4, a drain is connected to the third node N3, a gate is connected to the control terminal CT, and a source is connected to the first power voltage VSS. The fifth transistor NT5 has a drain connected to the third node N3, a gate connected to the fourth node N4, and a source connected to the first power voltage VSS.

In this case, the size of the third transistor NT3 is formed to be about twice as large as that of the fifth transistor NT5.

The pull-down driver 148 includes sixth and seventh NMOS transistors NT6 and NT7. In the sixth transistor NT6, a drain and a gate are commonly coupled to the second power supply voltage VDD, and a source is connected to the fourth node N4. In the seventh transistor NT7, a drain is connected to the fourth node N4, a gate is connected to the third node N3, and a source is coupled to the first power voltage VSS.

In this case, the size of the sixth transistor NT6 is about 16 times larger than the size of the seventh transistor NT7.

As shown in FIG. 7, when the first and second power clocks CKV and CKVB and the scan start signal ST are supplied to the shift register 141, the scan start signal ST is performed in the first stage SRC1. The high level section of the first power clock CKV is delayed by a predetermined time Tdr1 in response to the front end of the first power clock CKV, and is generated as an output signal OUT1 at the output terminal OUT.

As described above, the first and second power clocks CKV and CKVB are supplied to the glassy shift register on which the array substrate is disposed together with the scan start signal STV to perform an operation as a gate driving circuit.

However, since the first and second power clocks CKV and CKVB together with the scan start signal STV are converted and inputted to be adapted to the shift register by an integrated driving chip implemented to be optimal for an amorphous type liquid crystal display device, There is a problem that a general timing controller cannot be applied.

8A is a waveform diagram illustrating a scan start signal and a shift clock applied to a general shift register, and FIG. 8B is a waveform diagram illustrating a scan start signal and a power clock applied to a shift register according to the present invention. In particular, FIG. 8B illustrates a scan start signal and a power clock for being applied to a shift register mounted in an amorphous liquid crystal display device and operating as a gate driver IC.

That is, the general timing controller outputs a shift start clock (STV) and a shift start clock (CLOCK) having a scan start signal as one cycle so as to be suitable for a gate driver IC including a shift register and a level shifter as shown in FIG. 8A. do.

However, as shown in FIG. 8B, the gate driver IC implemented in the amorphous type liquid crystal display device includes the first and second power clocks having the scan start signal STV and the scan start signal STV at 1/2 cycles. CKV, CKVB) is output. This is because, as shown in FIG. 5, the first and second power clocks CKV and CKVB are output to odd and even stages, respectively, to output odd and even gate signals.

Accordingly, the present invention proposes a liquid crystal display device that can be implemented through a general timing controller even without implementing a separate integrated driving chip for an amorphous type liquid crystal display device.

9 is a diagram for describing a liquid crystal display according to an exemplary embodiment of the present invention.

9, a liquid crystal display according to the present invention includes a timing controller 500, a signal converter 600, and a display substrate 700. In this case, the timing controller 500 is preferably a general-purpose timing controller widely used.

The timing controller 500 receives an RGB image signal and various timing signals for controlling the display thereof from a graphic controller (not shown) or the like and includes a RGB image signal and a timing signal for driving data for outputting the RGB image signal. The signal 501 is provided to the gate driving circuit of the liquid crystal display panel, and the gate driving timing signal is provided to the signal converter 600.

Here, the data driving timing signal is a horizontal synchronization start signal (STH) indicating the start of one frame, and the RGB image signals passed from the timing controller 500 are converted into analog in the data driver 730. Load signals LOAD for instructing the converted analog values to be applied to the liquid crystal display panel 740, and HCLK, which is a clock for data shift in the data driver.

In addition, a gate driving signal is inputted to a gate line in the LCD panel, and a scan start signal STV for instructing the start of the gate on signal and a gate on signal are sequentially added to each gate line. There is a gate clock to perform.

The signal converter 600 includes a timing converter 610 and a level converter 620, and receives the gate clock CLOCK and the scan start signal STV provided from the timing controller 500 to form an amorphous liquid crystal. The scan start signal STV and the first and second power clocks CKV 'and CKVB' that are optimal for the display device are provided to the display substrate 700.

Here, the timing converter 610 will be described with reference to FIG. 11 to be described later.

In addition, the level converter 620 is a level shifter, and generally converts a low level voltage provided from the signal converter 610 into a high level voltage to provide the display substrate 700 with a detailed description thereof. The operation is the same as that of the level shifter. In particular, only a shift register is implemented in the gate driver formed on the array substrate, and the level shifter operates the level shifter for boosting the scan start signal provided from a general timing controller and the level of the first and second power clocks to a high voltage level. Since the unit 620 is in charge, a normal image can be displayed even if a separate level shifter is not provided in the gate driver.

The display substrate 700 includes a signal buffer 710, a gate driver 720, a source driver 730, and a liquid crystal display panel 740 to provide an RGB image signal and a timing signal for driving data from the timing controller 500. And a scan start signal STV and the first and second power clocks CKV 'and CKVB' provided from the timing converter 600 to display a predetermined image. In this case, the signal buffer may be omitted, and the scan start signal may be level-converted or bypassed.

In particular, the gate driver according to the present invention has a structure in which a plurality of stages are cascaded, as described above with reference to FIGS. 5 and 6. In the first stage, a scan start signal is coupled to an input terminal. Preferably, the shift signal includes one shift register that sequentially selects a plurality of gate lines by an output signal. In this case, the odd stages of the shift register are provided with the first power clock CKV, and the even stages are provided with the second power clock CKVB in which the phase is inverted from the first power clock CKV.

FIG. 10 is a diagram for describing the timing converter of FIG. 9, and FIG. 11 is a diagram for describing a detailed circuit of the timing converter of FIG. 10.

10 and 11, the timing converter 610 according to the present invention is an STV selector 612, a clock selector 614, a trigger edge selector 616, and a gate signal changer 618. Is done.

In operation, the scan start signal and the shift clock provided from the timing controller 500 are converted to be optimal for the amorphous type liquid crystal display panel and provided to the level converter 620. Here, various signal waveforms that may be provided from the timing controller 500 are as shown in FIGS. 12A to 12D.

That is, as shown in FIG. 12A, the timing controller 500 may output a non-inverted scan start signal, and as shown in FIG. 12B, may output an inverted scan start signal, as shown in FIG. 12C. As shown in the figure, the non-inverting shift clock can be output, and as shown in FIG. 12D, the inverted shift clock can also be output.

As such, the general timing controller 500 outputs the scan start signal and the shift clock having the waveform of any one of the above-described types of FIGS. 12A to 12D according to the driver IC to be driven.

The STV selector 612 includes a first inverter 612a and a first multiplexer 612b. The STV selector 612 receives the scan start signal from the timing controller 500 and receives the scan start signal based on the first select signal SELECT1. The trigger edge selector 616 outputs the inverted scan start signal to the trigger edge selector 616.

In more detail, the first multiplexer 612b receives the scan start signal STV provided from the timing controller 500 through one end thereof, and is provided from the timing controller 500 through the other end thereof to provide the first inverter 612a. The inverted scan start signal / STV received through the signal is output to the trigger edge selector 616 based on the first selection signal SELECT1.

The clock selector 614 includes a second inverter 614a and a second multiplexer 614b. The clock selector 614 receives the gate clock CLOCK from the timing controller 500 and based on the second select signal SELECT2, selects a gate clock. (CLOCK) is output to the trigger edge selector 616 or the inverted gate clock (/ CLOCK) is output to the trigger edge selector 616.

More specifically, the second multiplexer 614b receives the gate clock CLOCK provided from the timing controller 500 through one end thereof, and is provided from the timing controller 500 through the other end to provide the second inverter 614a. The inverted gate clock / CLOCK is provided to output any one signal to the trigger edge selector 616 based on the second selection signal SELECT2.

The trigger edge selector 616 includes a third inverter 616a, a D-flip flop 616b, a third multiplexer 616c, a first retarder 616d, an orgate 616e, and a fourth multiplexer 616f. ), A second delay unit 616g, a fourth inverter 616h, and a first end gate 616i, the scan start signal STV provided from the STV selector 612 or the inverted scan start signal ( / STV) and the gate clock changing unit by selecting the trigger edge based on the third selection signal SELECT3 by receiving the gate clock CLOCK or the inverted gate clock / CLOCK from the clock selector 614. Output to 618.

More specifically, the third inverter 616a receives the gate clock or the inverted gate clock from the second multiplexer 614b and inverts the clock clock and the fourth multiplexer 616f of the D-flip-flop 616b. to provide.

In addition, the D-flip-flop 616b receives a gate clock or an inverted gate clock through a clock terminal and receives a scan start signal or an inverted scan start signal through a data input terminal, thereby canceling a signal obtained by a predetermined operation. The third output is output to the third multiplexer 616c through the inversion output terminal Q.

In addition, the third multiplexer 616c receives a signal output from the STV selector 612 and a signal output from the D-flip-flop 616b, respectively, and receives any one signal based on the third selection signal SELECT3. Output

In addition, the or gate 616e receives a signal output from the third multiplexer 616c and a signal output from the third multiplexer 616c and delayed by the first delayer 616d through an OR operation. )

In addition, the fourth multiplexer 616f receives the signal output from the clock selector 614 and the signal inverted by the third inverter 616a, and selects one of the fourth multiplexers 616f based on the third selection signal SELECT3. Output

In addition, the first AND gate 616i is output from the fourth multiplexer 616f and is delayed by the second delayer 616g and output from the fourth multiplexer 616f and inverted by the fourth inverter 616h. The processed signal is output to the gate signal changing unit 618 through an AND operation. That is, the trigger edge selector 616 selects a falling edge when the scan start signal STV provided from the timing controller 500 is a falling edge signal in response to the third selection signal SELECT3. If the scan start signal STV provided from the timing controller 500 is a rising edge signal, the rising edge is selected and output to the gate signal changing unit 618.

The gate signal changer 618 includes a T-flip flop 618a, a third delay 618b, a second AND gate 618c, a fourth delay 618d, and a third AND gate 618e. The rising edge-selected power clock or the falling edge-selected power clock is received from the trigger edge selector 616, and the outputted power clock is changed and output to the level converter 620. For example, the period of the falling edge-selected first or second power clock may be doubled and output to the level converter 620, or the period of the rising-edge-selected first or second power clock is doubled to level conversion. It may output to the unit 620.

More specifically, the T-flip-flop 618a receives the output signal of the first end gate 616i through the clock stage, and receives the output signal of the orgate 616e through the non-inverting output stage through the clear stage. Signals are output to the third delayer 618b and the second AND gate 618c, and signals are output to the fourth delayer 618d and the third AND gate 618e through the inverting output terminal.

In addition, the second AND gate 618c performs an AND operation on the signal provided from the T-flip flop 618a and the signal passing through the third delay unit 618b, and the first power clock CKV 'which is the calculated signal. Is outputted to the level converter 620, and the third AND gate 618e performs an AND operation on the signal provided from the T-flip flop 618a and the signal passing through the third delay unit 618d, and the calculated signal. The second power clock CKVB 'is output to the level converter 620.

13A and 13B are waveform diagrams for explaining the relationship between the gate shift clock and the gate output. In particular, FIG. 13A is a waveform diagram for explaining the case where the gate output and the data output are triggered at the rising edge of the shift clock. 13b is a waveform diagram for explaining the case where the gate output and the data output are triggered on the falling edge of the shift clock.

That is, in the case of the falling edge trigger shown in Fig. 13B, the scan start signal shown in Fig. 13A is delayed to the right by one half of the shift clock, and at the same time, the shift clock is inverted.

14A and 14B are waveform diagrams for explaining the change of the scan start signal and the shift clock according to the trigger of the shift clock, and particularly, the first and second powers output by the gate signal changing unit 618 of FIG. This is a waveform diagram for explaining clocks CKV and CKVB.

Referring to FIG. 14A, the output of the scan start signal is completed before the data output from the timing controller 500 and stored in the source driver is completed. The shift clock corresponding to the scan start signal is changed from low level to high level. When transitioned, the first power clock CKV and the second power clock CKVB inverted in phase with the first power clock are output to the shift register.

Meanwhile, referring to FIG. 14B, the output of the scan start signal is completed during the data output from the timing controller 500 and stored in the source driver, and the shift clock corresponding to the scan start signal is changed from the low level to the high level. When the transition is made, the first power clock CKV and the second power clock CKVB inverted in phase with the first power clock are output to the shift register.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

As described above, according to the present invention, in the amorphous liquid crystal display device which performs the operation of the gate drive IC as a shift resist formed on the array substrate without providing the gate drive IC separately, it is optimal for the amorphous liquid crystal display device. Even if a general-purpose timing controller is used, the general-purpose scan start signal and the gate clock output from the timing controller to control the output of the gate signal are optimized for the shift register of the amorphous liquid crystal display device. The modified scan start signal and the first and second power clocks may be provided.

Claims (4)

A liquid crystal display device comprising: a display cell array circuit formed on a transparent substrate including a plurality of data lines and a plurality of gate lines crossing the data lines; and data driving means for outputting a data signal to the data lines. Receiving an image signal and a first timing signal for output control of the image signal from an external source, outputting the second timing signal and the image signal generated in response to the first timing signal to the data driving circuit, Timing control means for outputting a first scan start signal and a third timing signal generated in response to the first timing signal; The second scan start signal generated by converting the timing and level of the first scan start signal, the first power clock generated by converting the timing and level of the third timing signal, and the first power clock are in phase with each other. Signal conversion means for outputting an inverted second power clock; And A plurality of stages are cascaded on the transparent substrate, and the odd stage and even stages of the shift register are provided with the first power clock and the second power clock, respectively. And a gate driving unit configured to input the second scan start signal to an input terminal and sequentially select the plurality of gate lines based on an output signal of each stage. The method of claim 1, wherein the signal conversion means, A third scan start signal generated by converting the timing of the first scan start signal, a third power clock generated by converting the timing of the third timing signal, and a fourth inverted phase with the third power clock A timing converter configured to output a power clock; And A second scan start signal shifted in the voltage level of the third scan start signal, a first power clock shifted in the voltage level of the third power clock, and a second power clock inverted in phase with the first power clock; And a level converting section for outputting to the gate driving means. The method of claim 2, wherein the timing converter, A scan start signal selection unit outputting any one of the first scan start signal and a scan start signal inverted to the first scan start signal based on a first selection signal; A clock selector configured to output one of the shift clock and the shift clock inverted to the shift clock based on a second selection signal; Based on a third selection signal, any one of a falling edge or a rising edge of a signal provided from the scan start signal selection unit is selected and output, and a falling edge of the first and second power clocks provided from the clock selection unit. Or a trigger edge selector for selecting and outputting any one of the rising edges; And And a gate signal changer configured to convert the first and second power clocks of the falling edge or rising edge selected from the trigger edge selector and output the converted first and second power clocks to the level converter. The method of claim 3, wherein the gate signal changing unit, And multiplying the periods of the first and second power clocks selected by the falling edge or the rising edge and outputting the resultant to the level converter.