KR101285026B1 - Liquid Crystal Display device - Google Patents

Abstract

A liquid crystal display device capable of improving image quality is disclosed.

The liquid crystal display according to the present invention includes a liquid crystal panel, first and second driver ICs for driving the liquid crystal panel, a common voltage generator for supplying a common voltage to the liquid crystal panel, and the first and second driver ICs. And a control unit for controlling the common voltage compensator and a common voltage compensator built in any one of the driver ICs to compensate for the common voltage.

Common Voltage Compensation, Driver IC

Description

[0001] The present invention relates to a liquid crystal display device,

1 is a view showing a conventional liquid crystal display device.

2 is a view showing a liquid crystal display device according to the present invention.

3 is a view illustrating in detail the gate and data common voltage compensator of FIG. 2;

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

101: lower substrate 102: liquid crystal panel

103: upper board

104a, 104b: First and Second Gate Driver ICs

105a, 105b: first and second gate TCP

106a to 106c: first to third data driver ICs

107a to 107c: first to third data TCP 108: data PCB

110a to 110c: first to third data common voltage compensators

112: common voltage generator 116: timing controller

120a and 120b: first and second gate common voltage compensators

125, 130: OPAMP

135a to 135d: first to fourth data TCP lines

145a to 145c: first to third gate TCP lines

150a ~ 150d: Dummy LOG Line

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of improving image quality by preventing distortion of a common voltage.

The liquid crystal display displays an image by adjusting the light transmittance of the liquid crystal cells according to a video signal. Among the liquid crystal display devices, an active matrix type in which switching elements are provided for each liquid crystal cell is suitable for displaying moving images. In the active matrix liquid crystal display device, a thin film transistor (TFT) is mainly used as a switching element.

1 is a view showing a conventional liquid crystal display device.

As shown in FIG. 1, the liquid crystal display includes a liquid crystal panel 2, a plurality of data TCPs 4 connected between the liquid crystal panel 2 and the data PCB 8, and the data PCB ( 8) a timing controller 16 mounted within the controller, a plurality of gate TCPs 10 connected to the other side of the liquid crystal panel 2, and a data driver IC 6 mounted on each of the data TCPs 4; ) And gate driver ICs 12 mounted on each of the gate TCPs 10.

The image display area of the liquid crystal panel 2 is defined by the intersection of the plurality of gate lines GL0 to GLn and the data lines DL1 to DLm. A thin film transistor TFT and a pixel electrode are formed in the image display area. Data pads (not shown) connected to the data TCP 4 and data links (not shown) interconnecting the data pads and data lines are located in the outer region of the image display area.

The image display area further includes a common voltage Vcom supply line 13 formed in parallel with the gate lines GL0 to GLn.

The liquid crystal panel 2 includes a lower substrate 1 and an upper substrate 3 made of a transparent insulating substrate, and a liquid crystal (not shown) injected between the lower substrate 1 and the upper substrate 3.

In addition, gate pads (not shown) connected to the gate TCP 10 and gate links (not shown) interconnecting the gate pads and the gate lines are disposed in an outer region of the image display area. In the outer region, the LOG signal line group 14 mounted on the lower substrate 1 is positioned to connect the gate driver ICs 12 mounted on the gate TCP 10 in series.

In particular, the LOG signal line group 14 is located between the first data TCP 4 and the first gate TCP 10 and is externally connected via the data PCB 8 and the first data TCP 4. The supplied gate control signals and gate voltages are supplied to the first gate TCP 10.

The gate driver IC 12 sequentially supplies a gate high voltage VGH to the gate lines GL1 to GLn in response to gate control signals supplied from the timing controller 16.

The data driver IC 6 outputs the data voltage of one line for each horizontal period H1, H2 .. in response to the data control signals from the timing controller 16. To feed.

The timing controller 16 generates gate control signals for controlling the gate driver IC 12, and generates data control signals for controlling the data driver IC 6.

The common voltage generator 18 uses the power voltage Vdd generated by the DC / DC converter (not shown) to the liquid crystal panel 2 to generate the common voltage Vcom for driving the liquid crystal panel 2. ) The common voltage Vcom is supplied to the common voltage supply line 13 on the liquid crystal panel 2. In addition, a gate insulating layer is formed on the common voltage supply line 13, and the data line is formed on the gate insulating layer. As a result, a capacitance is formed between the common voltage supply line and the data lines DL1 to DLm.

When the data signal value between the data lines DL1 to DLm changes abruptly, a ripple occurs in the common voltage Vcom supplied to the common voltage supply line 13 by the capacitance. When the common voltage Vcom distorted by the ripple is supplied to the liquid crystal panel 2, a crosstalk phenomenon occurs. In order to eliminate this phenomenon, the common voltage Vcom compensator 20 is provided.

The common voltage Vcom compensator 20 compensates for the distorted common voltage Vcom and supplies it to the liquid crystal panel 2. In this case, the common voltage Vcom compensator includes an op amp. The common voltage Vcom compensator 12 supplies the distorted common voltage Vcom to an inverting (−) input terminal of the op amp. The DC voltage is supplied to the non-inverting input terminal (+) of the OPAMP.

The DC voltage refers to a common voltage Vcom having a constant voltage level generated by the common voltage generator 18.

The op amp generates an inverted voltage of the distorted common voltage Vcom supplied to the inverting (−) input terminal of the op amp. That is, the common voltage Vcom compensator 20 generates a voltage inverted of the distorted common voltage Vcom, outputs the voltage along with the DC voltage, and supplies the same to the liquid crystal panel 2.

In the liquid crystal display, when the common voltage Vcom is supplied to the liquid crystal panel 2 for one frame, the common voltage Vcom is distorted by the ripple of the common voltage Vcom generated by the capacitance. The distorted common voltage Vcom causes cross talk in a horizontal line. The liquid crystal display compensates for the distorted common voltage Vcom in the next frame.

The common voltage Vcom compensator 20 receives and compensates the distorted common voltage Vcom through a feedback line F / B provided on the liquid crystal panel 2 to compensate for the liquid crystal panel 2. The compensated common voltage Vcom is supplied to the common voltage supply line 13 arranged at the. The distorted common voltage Vcom is compensated by the common voltage Vcom compensator 20 and is supplied to a common voltage line (not shown) arranged on the liquid crystal panel 2.

However, the distortion of the common voltage Vcom occurring at the upper, middle, and lower ends of the liquid crystal panel 2 is different due to the load characteristics of the liquid crystal panel 2. That is, distortion of the common voltage Vcom generated due to an increase in the area of the liquid crystal panel 2 or a line resistance of the common voltage supply line 13 may occur at the upper, middle, and lower ends of the liquid crystal panel 2. Each one is different.

Accordingly, even when the common voltage Vcom compensator 12 compensates the distorted common voltage Vcom and supplies the same to the liquid crystal panel 2, the common voltage Vcom compensator 12 is generated at the upper, middle, and lower ends of the liquid crystal panel 2. Not all distortions of the voltage Vcom are overcome.

An object of the present invention is to provide a liquid crystal display device in which a common voltage Vcom compensator is mounted inside a driver IC to compensate for a distorted common voltage Vcom for each area of a liquid crystal panel, thereby improving image quality.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a liquid crystal panel, first and second driver ICs driving the liquid crystal panel, and a common voltage generation supplying a common voltage to the liquid crystal panel. And a controller configured to control the common voltage compensator and a common voltage compensator embedded in one of the first and second driver ICs to compensate the common voltage.

According to a second exemplary embodiment of the present invention, there is provided a liquid crystal panel, a first and second driver ICs driving the liquid crystal panel, and a common voltage generation supplying a common voltage to the liquid crystal panel. And a controller configured to control the common voltage compensator and the first and second common voltage compensators respectively embedded in the first and second driver ICs to compensate for the common voltage.

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

2 is a view showing a liquid crystal display device according to the present invention.

As shown in FIG. 2, the liquid crystal display according to the present invention includes a liquid crystal panel 102 for displaying a predetermined image, and first to third devices connected between the liquid crystal panel 102 and the data PCB 108. First and second gate TCPs 105a and 105b connected to data TCPs 107a to 107c, a timing controller 116 mounted in the data PCB 108, and the other side of the liquid crystal panel 102, respectively. And first to third data driver ICs 106a to 106c mounted on each of the first to third data TCPs 107a to 107c, and the first and second gate TCPs 105a and 105b. Each of them has first and second gate driver ICs 104a and 104b mounted thereon.

In this case, for convenience of explanation, it is assumed that the first to sixtyth gate lines GL1 to GL60 and the first to ninetyth data lines DL1 to DL90 are arranged in the liquid crystal panel 102. In addition, a dummy gate line GL0 is further arranged in the liquid crystal panel 102.

In the image display area of the liquid crystal panel 102, liquid crystal cells are positioned at respective regions formed by intersections of the first to sixty gate lines GL1 to GL60 and the first to ninetieth data lines DL1 to DL90. The image according to the signal is displayed.

In an outer region of the image display area, data pads (not shown) connected to the first to third data TCPs 107a to 107c and a data link (not shown) interconnecting the data pads and data lines are provided. Are located.

The liquid crystal panel 102 includes first to sixth gate common lines GV1 to GV60 formed to be parallel to the first to sixty gate lines GL1 to GL60. In addition, the liquid crystal panel 102 includes first to ninety data common lines DV1 to DV90 formed in parallel with the first to ninety data lines DL1 to DL90.

The first to thirtieth gate common lines GV1 to GV30 of the first to sixty gate common lines GV1 to GV60 are connected to the first gate driver IC 104a and the thirty-first to sixty gate common lines GV31 to GV60 are connected to the second gate driver IC 104b.

The first to thirtieth gate common lines GV1 to GV30 and the thirty first to sixty gate common lines GV31 to GV60 separate the liquid crystal panel 102 into two regions.

The first to thirtieth data common lines DV1 to DV30 of the first to ninetieth data common lines DV1 to DV90 are connected to the first data driver IC 106a and the thirty first to sixty data common lines. The DV1 to DV30 are connected to the second data driver IC 106b, and the 61st to 90th data common lines DV61 to DV90 are connected to the third data driver IC 106c.

The liquid crystal panel 102 includes the first to thirtieth data common lines DV1 to DV3, the thirty-first to sixtyth data common lines DV31 to DV60, and the sixteenth to thirtieth data common lines DV61 to DV90. Is separated into three areas.

The first to sixty gate common lines GV1 to GV60 are made of the same material as the first to sixty gate lines GL1 to GL60 and are formed in the same process. The first to ninetyth data common lines DL1 to DL90 are made of the same material as the first to ninetyth data lines DL1 to DL90 and are formed in the same process.

The liquid crystal panel 102 includes a lower substrate 101 and an upper substrate 103 formed of a transparent insulating substrate, and a liquid crystal (not shown) injected between the lower substrate 101 and the upper substrate 103. In the outer region of the lower substrate 101, data pads (not shown) extended from the first to 90th data lines DL1 to DL90, and the first to 60th gate lines GL1 to GL60. Gate pads (not shown) that extend from the top are positioned.

Also, in the outer region of the lower substrate 101, a LOG signal line group 140 for transmitting gate driving signals supplied to the first and second gate driver ICs 104a and 104b is located.

In this case, the first to 60th gate common lines GV1 to GV60 and the first to 90th data common lines DV1 to DV90 have a common voltage Vcom formed on the lower substrate 101. Ag).

The silver dot Ag is electrically connected to a common electrode (not shown) formed on the upper substrate 103 so that the common voltage Vcom supplied to the silver dot Ag is supplied to the common electrode to provide the liquid crystal. One driving voltage for driving the liquid crystal layer formed on the panel 102 becomes.

The timing controller 116 is mounted on the data PCB 108 to control the first and second gate driver ICs 104a and 104b and the first to third data driver ICs 106a to 106c. Create

The first to third data driver ICs 106a to 106c are mounted on the first to third data TCPs 107a to 107c, respectively. Input pads (not shown) and output pads (not shown) to which the first to third data driver ICs 106a to 106c are electrically connected are electrically connected to the data pads on the lower substrate 101.

The first to third data driver ICs 106a to 106c convert the digital data signal into a data voltage that is an analog signal and according to the data control signal generated by the timing controller 116, the first on the liquid crystal panel 102. To the 90th data lines DL1 to DL90.

The first and second gate driver ICs 104a and 104b sequentially supply a scan signal, that is, a gate high voltage VGH, to the first to 60th gate lines GL1 to GL60 in response to gate driving signals. do.

In addition, the first and second gate driver ICs 104a and 104b supply the gate low voltage signal VGL to the gate lines in a period other than the period in which the gate high voltage signal VGH is supplied.

Each of the first to third data driver ICs 106a to 106c includes first to third data common voltage compensators 110a to 110c, respectively, and the first and second gate driver ICs 104a and 104b. Each of the first and second gate common voltage compensators 120a and 120b is embedded therein.

The reference voltage of the liquid crystal panel 102 becomes the reference voltage on the data PCB 108 and the first to 60th gate supply lines GV1 to GV60 and the first to 90th data supply lines DV1 to DV90 during the first frame. The apparatus further includes a common voltage generator 112 for supplying a common voltage Vcom.

As described above, the common voltage generating unit 112 sets a DC voltage having a constant voltage level, that is, the common voltage Vcom to the first to 60th gate common lines GV1 to GV60 and the first to 90th. It is supplied to the data common lines DV1 to DV90.

In addition, the common voltage Vcom generated by the common voltage generator 112 includes the first and second gate common voltage compensators 120a and 120b and the first to third data common voltage compensators 110a. ~ 110c).

The common voltage Vcom supplied to the first and second gate common voltage compensators 120a and 120b and the first to third data common voltage compensators 110a to 110c becomes a reference voltage Vref.

As mentioned above, the common voltage Vcom causes distortion due to the load characteristics of the liquid crystal panel 102, that is, line resistance and load. The distorted common voltage Vcom is supplied to the first and second gate common voltage compensators 120a and 102b and the first to third data common voltage compensators 110a to 110c before the next frame starts. .

In this case, the first gate common voltage compensator 120a compensates for the distorted common voltage Vcom and supplies the same to the first to thirtieth gate common lines GV1 to GV30. The second gate common voltage compensator 120b compensates for the distorted common voltage Vcom and supplies the same to the thirty first to sixth gate common lines GV31 to GV60.

The first data common voltage compensator 110a compensates the distorted common voltage Vcom and supplies it to the first to thirtieth data common lines DV1 to DV30. The second data common voltage compensator 110b compensates for the distorted common voltage Vcom and supplies the same to the thirty first to sixtyth data common lines DV31 to DV60. The third data common voltage compensator 110c compensates for the distorted common voltage Vcom and supplies the same to the 61 st through 90 th data common lines DV61 ˜ DV90.

As described above, the common voltage generator 112 generates the common voltage Vcom during the first frame, so that the first to 90th data common lines DV1 to DV90 and the first to 60th gate are common. Supply to the line (GV1 ~ GV60).

The common voltage Vcom supplied to the first to sixtyth gate common lines GV1 to GV60 is distorted due to line resistance and load. The common voltage Vcom supplied to the first to ninetyth data common lines DV1 to DV90 is also distorted due to line resistance and load.

The common voltage Vcom supplied to the first to thirtieth gate common lines GV1 to GV30 among the first to sixty gate common lines GV1 to GV60 is fed back through the thirtieth gate common line GV30. The first gate common voltage compensator 120a is supplied.

The distortion common voltage Vcom fed back to the first gate common voltage compensator 120a is compensated and supplied to the first to thirtieth gate common lines GV1 to GV30 during the next frame.

The second gate common voltage compensator 120b receives the distorted common voltage Vcom from the 60th gate common line GV60 and compensates the feedback to compensate for the 31st to 60th gate common lines GV1 to GV60. The common voltage Vcom.

The common voltage Vcom supplied to the first to thirtieth data common lines DV1 to DV30 among the first to ninetieth data common lines DV1 to DV90 is the first through the thirtieth data common line DV30. The data is supplied to the common voltage compensator 110a.

The distortion common voltage Vcom fed back to the first data common voltage compensator 110a is compensated and supplied to the first to thirtieth data common lines DV1 to DV30 during the next frame.

The second data common voltage compensator 110b receives feedback of the distorted common voltage Vcom from the 60th data common line DV60 and compensates the feedback to the 31 st through 60 th data common lines DV31 to DV60. The common voltage Vcom.

The third data common voltage compensator 110c receives the distorted common voltage Vcom from the 90th data common line DV90 and compensates the feedback, thereby compensating for the 61st to 90th data common lines DV61 to DV90. Supply the common voltage Vcom.

As such, the common voltage Vcom compensated by the first to sixtyth gate common lines GV1 to GV60 and the first to ninetyth data common lines DV1 to DV90 may be formed on the lower substrate 101. The dot Ag is supplied to the common electrode formed on the upper substrate 103.

FIG. 3 is a detailed diagram illustrating the gate and data common voltage compensator of FIG. 2.

As shown in FIGS. 2 and 3, the first gate common voltage compensator 120a is embedded in the first gate driver IC 104a, and the second gate common voltage compensator 120b is configured as the second gate common voltage compensator 120b. It is built in the gate driver IC 104b.

The first data common voltage compensator 110a is embedded in the first data driver IC 106a, and the second data common voltage compensator 110b is embedded in the second data driver IC 106b. The third data common voltage compensator 110c is embedded in the third data driver IC 106c.

For convenience of description, in FIG. 3, the first gate common voltage compensator 120a embedded in the first gate driver IC 104a and the first data embedded within the first data driver IC 106a. Only the common voltage compensator 110a is shown in detail.

As described above, the first gate common voltage compensator 120a is electrically connected to the first to thirtieth gate common lines GV1 to GV30 so that the first common gate voltage compensation unit 120a compensates for the compensated common voltage. Supply to (GV1 ~ GV30).

As illustrated in FIG. 3, the first gate common voltage compensator 120a includes an op amp 130, and includes first and second resistors R1 and R2 and a first capacitor C1.

The first and second resistors R1 and R2 and the first capacitor C1 are mounted on the data PCB 108, and the op amp is embedded in the first gate driver IC 104a.

The distorted common voltage through the thirtieth gate common line GV30 is supplied to the inverting terminal (−) of the op amp 130. In this case, a DC voltage having a constant voltage level generated by the common voltage generator 112, that is, the common voltage Vcom is supplied to the non-inverting input terminal (+) of the op amp 130.

The first gate common voltage compensator 120a is supplied to the common voltage Vcom supplied to the non-inverting input terminal (+) of the op amp 130 and the inverting input terminal (−) of the op amp 130. The difference value of the distorted common voltage is inverted and output. As a result, the first gate common voltage compensator 120a generates a compensated common voltage inverted from the distorted common voltage.

The first resistor R1 mounted on the data PCB 108 is connected to the second data TCP line 135b patterned on the first data TCP 107a, and the second TCP line 135b is It is connected to the second dummy LOG line 150b formed on the lower substrate 101. The second dummy LOG line 150b is electrically connected to a second gate TCP line 145b patterned on the first gate TCP 105a.

In addition, the first resistor R1 is connected to one side of the first capacitor C1 mounted on the data PCB 108, and the other side of the first capacitor C1 is the first data TCP 105a. It is connected to the first data TCP line 135a patterned on it.

The first data TCP line 135a is connected to the first dummy LOG line 150a formed on the lower substrate 101. The first dummy LOG line 150a is electrically connected to a first gate TCP line 145a patterned on the first gate TCP 105a.

The second resistor R2 is connected to a third data TCP line 135c patterned on the first data TCP 107a, and the third data TCP line 135C is on the lower substrate 101. It is electrically connected to the formed third dummy LOG line 150c.

The third dummy LOG line 150c is electrically connected to a third gate TCP line 145c patterned on the first gate TCP 105a and the third gate TCP line 145c is connected to the op amp. 130 is inverted terminal (-).

As described above, the first and second resistors R1 and R2 are connected to the op amp through the second and third gate TCP lines 145b and 145c patterned on the first gate TCP 105a. 130 is inverted terminal (-).

Therefore, when the distortion common voltage supplied from the thirtieth gate common line GV30 is supplied to the first gate TCP 105a, the distortion common voltage is a resistance ratio of the first and second resistors R1 and R2. Will be compensated accordingly. The first and second resistors R1 and R2 are mounted on the data PCB 108 to be easily controlled by the user from the outside.

In this case, the resistance values of the first and second resistors R1 and R2 are line resistances of the first to sixty gate common lines GV1 to GV60 arranged on the liquid crystal panel 102 and the liquid crystal panel 102. This value is calculated by considering the load and so on.

The common voltage compensated by the resistance ratio is 180 ° out of phase with the distortion common voltage supplied from the thirtieth gate common line GV30.

As such, the common voltage compensated by the first gate common voltage compensator 120a may be the first to thirtieth gate common lines GV1 to GV30 electrically connected to the first gate common voltage compensator 120a during the next frame. Supplied by.

The second gate common voltage compensator 120b also supplies the compensated common voltage to the thirty-first through sixth gate common lines GV31 to GV60 similarly to the first gate common voltage compensator 120a.

As a result, the common voltage distorted due to the line resistance and the load of the liquid crystal panel 102 in the previous frame is compensated for the first and second gate common voltages embedded in the first and second gate driver ICs 104a and 104b. Compensated by the portions 120a and 120b, the first and sixth gate common lines GV1 to GV60 are supplied.

By supplying the common voltage compensated to the first to sixth gate common lines GV1 to GV60, the common voltage distorted due to the line resistance and the load of the liquid crystal panel 102 can be compensated for during the previous frame. .

As a result, the liquid crystal display according to the present invention can compensate for the distortion of the common voltage generated in the previous frame during the next frame, thereby preventing the degradation of the image quality caused by the distortion of the common voltage and improving the image quality.

As described above, the first data common voltage compensator 110a is electrically connected to the first to thirtieth data common lines DV1 to DV30 so that the first common voltage compensation unit 110a compensates for the compensated common voltage. Supply to (DV1 ~ DV30).

The first data common voltage compensator 110a is embedded in the first data driver IC 106a and includes the op amp 125, the third and fourth resistors R3 and R4, and the second capacitor C2. Is made of.

The third and fourth resistors R3 and R4 and the second capacitor C2 are mounted on the data PCB 108 and the op amp 125 is embedded in the first data common voltage compensator 110a. have.

The third and fourth resistors R3 and R4 are connected to the inverting terminal (−) of the op amp 125, and the common voltage generator 112 is connected to the non-inverting terminal (+) of the op amp 125. The common voltage (Vcom) generated at) is supplied.

Similar to the first gate common voltage compensator 120a, the first data common voltage compensator 110a and the common voltage Vcom supplied to the non-inverting input terminal (+) of the op amp 125 and the op The difference value of the distorted common voltage supplied to the inverting input terminal (-) of the amplifier 125 is inverted and output.

As a result, the first data common voltage compensator 110a generates a compensated common voltage inverted from the distorted common voltage.

Therefore, when the distortion common voltage supplied from the thirtieth data common line DV30 is supplied to the first data TCP 107a, the distortion common voltage is a resistance ratio of the third and fourth resistors R3 and R4. Will be compensated accordingly.

The resistance values of the third and fourth resistors R3 and R4 may be line resistances of the first to ninety data common lines DV1 to DV90 arranged on the liquid crystal panel 102 and the loads of the liquid crystal panel 102. The value calculated in consideration of the like. The third and fourth resistors R3 and R4 may be mounted on the data PCB 108 to be easily controlled by the user from the outside.

The common voltage compensated by the resistance ratios of the third and fourth resistors R3 and R4 is 180 ° out of phase with the distortion common voltage supplied from the thirtieth data common line DV30.

As described above, the common voltage compensated by the first data common voltage compensator 110a is the first to thirtieth data common lines DV1 to DV30 electrically connected to the first data common voltage compensator 110a during the next frame. Supplied by.

The second data common voltage compensator 110b also supplies the compensated common voltage to the thirty-first to sixtyth data common lines DV31 to DV60 similarly to the first data common voltage compensator 110a.

Similar to the first and second data common voltage compensators 110a and 110b, the third common voltage compensator 110c compensates the common voltage to the 61 th to 90 th data common lines DV61 to DV90. Supply.

As a result, the common voltage distorted due to the line resistance and the load of the liquid crystal panel 102 in the previous frame is compensated for the first to third data common voltages built in the first to third data driver ICs 106a to 106c. Compensated by the units 110a to 110c and supplied to the first to 90th data common lines DV1 to DV90.

By supplying the common voltage compensated to the first to 90th data common lines DV1 to DV90, the common voltage distorted due to the line resistance and the load of the liquid crystal panel 102 may be compensated.

As a result, the liquid crystal display according to the present invention can compensate for the distortion of the common voltage generated in the previous frame during the next frame, thereby preventing the degradation of the image quality caused by the distortion of the common voltage and improving the image quality.

The first and second gate common voltage compensators 120a and 120b are embedded in the first and second gate driver ICs 104a and 104b, which increase as the number of the gate driver ICs 104a and 104b increases. The first and second gate common voltage compensators 120a and 120b may also increase to correspond to the number of the first and second gate driver ICs 104a and 104b.

As the number of the first to third data driver ICs 106a to 106c increases, the first to third data common voltage compensators 110a to 110c increase as the number of the first to third data driver ICs 106a to 110c increases. It can increase in correspondence with the number of 106c).

The first and second gate common voltage compensators 120a and 120b are embedded in the first and second gate driver ICs 104a and 104b and the first to third data common voltage compensators 110a to 110c. Since the first to third data driver ICs 106a to 106c are built in, the distortion of the common voltage Vcom generated in the conventional liquid crystal display device can be compensated for.

As mentioned above, the liquid crystal display according to the present invention includes a common voltage compensator separately included in the gate driver IC and the data driver IC, so that the common voltage Vcom distorted for each area of the liquid crystal panel in the conventional liquid crystal display is reduced. Since they are not compensated for, they can improve image quality by overcoming problems such as image quality deterioration.

As described above, the liquid crystal display according to the present invention receives a common voltage distorted by region of the liquid crystal panel by embedding a common voltage compensator into a gate driver IC or a data driver IC positioned on the liquid crystal panel for each region. By compensating, the image quality can be improved by overcoming a problem occurring in the conventional liquid crystal display.

In addition, in the liquid crystal display according to the present invention, the user can easily control the common voltage compensator from the outside by mounting the resistor and the capacitor constituting the common voltage compensator on the data PCB.

Claims (10)

A liquid crystal panel; First and second driver ICs driving the liquid crystal panel; A common voltage generator supplying a common voltage to the liquid crystal panel through a common line; A common voltage compensator embedded in one of the first and second driver ICs and connected to the common line to compensate for the common voltage; And A control unit for controlling the common voltage compensation unit; The common voltage compensator includes a non-inverting amplifier, The non-inverting amplifier, The distorted common voltage is applied to the inverting terminal through the common line, The non-inverting terminal is supplied with a common voltage generated by the common voltage generator. The method of claim 1, And the control unit is mounted on a printed circuit board connected to one side of the liquid crystal panel. The method of claim 1, The control unit, A first resistor connected between the inverting terminal and the capacitor, And a second resistor connected between the inverting terminal and the output terminal of the non-inverting amplifier. delete The method of claim 1, Wherein the common voltage is a reference voltage of the common voltage compensator. A liquid crystal panel; First and second driver ICs driving the liquid crystal panel; A common voltage generator supplying a common voltage to the liquid crystal panel through a common line; First and second common voltage compensators respectively embedded in the first and second driver ICs and connected to the common line to compensate for the common voltage; And A control unit for controlling the common voltage compensation unit; The common voltage compensator includes a non-inverting amplifier, The non-inverting amplifier, The distorted common voltage is applied to the inverting terminal through the common line, The non-inverting terminal is supplied with a common voltage generated by the common voltage generator. The method according to claim 6, And the control unit is mounted on a printed circuit board connected to one side of the liquid crystal panel. delete The method according to claim 6, Wherein the common voltage is a reference voltage of the common voltage compensator. The method of claim 3, And a value of the first and second resistors is adjustable.

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