KR101128467B1 - Liquid crystal display controllable viewing angle - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of viewing angle control, comprising: a color filter substrate facing an array substrate and an array substrate divided in pixel units by horizontal gate lines and vertical data lines crossing each other; A liquid crystal layer formed between the two substrates, red, green, and blue color pixels formed on the array substrate and forming a horizontal electric field; and viewing angle control pixels disposed adjacent to the color pixels and forming a vertical electric field. A plurality of group pixels configured, red, green, and blue color filters formed on the color filter substrate, and a driving unit for driving the group pixels and applying dot inversion and frame inversion when driving the group pixels. A liquid crystal display device is provided.

LCD, wide viewing angle, narrow viewing angle

Description

Liquid crystal display controllable viewing angle

1 and 2 are diagrams illustrating a liquid crystal display according to the related art.

3 is a graph illustrating a relationship between a viewing angle and luminance when the liquid crystal display of FIGS. 1 and 2 is in the wide viewing angle mode.

4 is a graph illustrating a relationship between a viewing angle and luminance when the liquid crystal display of FIGS. 1 and 2 is in the narrow viewing angle mode.

5 and 6 are model views illustrating an inversion driving method of a liquid crystal display according to the related art.

7 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 8 is a plan view schematically illustrating a portion of an array substrate constituting the liquid crystal panel of FIG. 7.

9 is a plan view showing a portion of FIG. 8 in more detail.

FIG. 10 is a cross-sectional view schematically illustrating a line II of FIG. 9.

FIG. 11 is a schematic diagram illustrating arrangement of color pixels constituting a group pixel and a viewing angle control pixel in an embodiment of the present invention.

12 to 14 are model views illustrating a case in which various inversion driving schemes are applied to the liquid crystal display according to the exemplary embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

100: liquid crystal panel 110: array substrate

120: color filter substrate 130: liquid crystal layer

GP: group pixel R, G, B: color pixel

E: viewing angle control pixel 200: drive unit

210: gate driver 220: data driver

230: timing controller

The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display capable of selectively implementing a wide viewing angle and a narrow viewing angle.

The liquid crystal display device forms a liquid crystal layer having anisotropic dielectric constant between the color filter substrate, which is the upper and lower transparent insulating substrates, and the array substrate, and then changes the molecular arrangement of the liquid crystal material by adjusting the intensity of the electric field formed in the liquid crystal material of the liquid crystal layer. The display device expresses a desired image by controlling the amount of light transmitted through the color filter substrate. As the liquid crystal display, a thin film transistor liquid crystal display (TFT LCD) using a thin film transistor (TFT) as a switching element is mainly used.

1 and 2 are diagrams illustrating a liquid crystal display device according to the related art, in particular, a case in which a liquid crystal display device having a view angle control mode is driven in a wide viewing angle mode and a narrow viewing angle mode, respectively. Doing.

Basic principles of the viewing angle control method shown in FIGS. 1 and 2 are as follows.

A liquid crystal panel for adjusting the viewing angle is added to the upper or lower portion of the liquid crystal panel configured to have a wide electric field structure having a wide viewing angle, and the wide liquid crystal panel is driven to adjust the wide viewing angle and the narrow viewing angle mode. The liquid crystal panel added to adjust the viewing angle basically has a function of not harming the wide viewing angle of the liquid crystal panel displaying an image, and a function of inducing a necessary narrow viewing angle in terms of security or privacy.

1 and 2, the liquid crystal panel including the first liquid crystal layer 80 is a panel for adjusting the viewing angle, and the liquid crystal panel including the second liquid crystal layer 90 is a panel for displaying an image to have a wide viewing angle. . If no voltage is applied to the first liquid crystal layer 80, the liquid crystal molecules 81 are arranged in parallel to the two substrates 10 and 20 to maintain the original wide viewing angle, thereby entering the wide viewing angle mode, and thus, the first liquid crystal layer 80. ), The liquid crystal molecules 81 are arranged perpendicular to the two substrates 10 and 20, and the viewing angle is reduced, thereby entering the narrow viewing angle mode.

1 and 2, the first, second, and third transparent insulating substrates 10, 20, and 30 are arranged in parallel with each other, and the first transparent insulating substrate 10 and the second transparent insulating substrate ( Transparent electrodes 70 and 60 are formed to face each other on the inner surface between the sides 20, and two linear electrodes 40 and 50 are formed parallel to each other on the upper surface of the second transparent insulating substrate 20. .

The first and second liquid crystal layers 80 and 90 are disposed between the first transparent insulating substrate 10 positioned below and the third transparent insulating substrate 30 positioned above the second transparent insulating substrate 20. These are formed, respectively.

The liquid crystal panel including the first and second transparent insulating substrates 10 and 20 and the first liquid crystal layer 80 between the two substrates 10 and 20 has a viewing angle control liquid crystal capable of adjusting a wide viewing angle and a narrow viewing angle. In the state where the panel is not applied, the liquid crystal molecules 81 of the first liquid crystal layer 80 are aligned in parallel with the first and second transparent insulating substrates 10 and 20 as shown in FIG. 1. In the wide viewing angle mode shown in FIG. 1, the liquid crystal molecules 91 of the second liquid crystal layer 90 are also aligned in the same direction, so that the liquid crystal molecules 91 have the same viewing angle as that of the liquid crystal display having a general transverse electric field structure having one liquid crystal panel. It does not affect other characteristics of the transverse electric field structure.

On the outer surfaces of the first transparent insulating substrate 10 and the third transparent insulating substrate 30, two sheets of polarizing plates 11 and 31 for polarizing light passing therethrough are attached. At this time, the transmission axis directions of the polarizing plates 11 and 31 are arranged to be perpendicular or parallel to the alignment direction of the liquid crystal molecules 81 and 91.

FIG. 2 illustrates a case where the liquid crystal display of FIG. 1 is used in the narrow viewing angle mode.

When a voltage is applied to the two transparent electrodes 70 and 60 to form an electric field in the vertical direction between the first and second transparent insulating substrates 10 and 20, the liquid crystal molecules 81 of the first liquid crystal layer 80 are formed. They are arranged perpendicular to the two substrates 10, 20 along the direction of the electric field. In this case, the liquid crystal molecules 82 adjacent to the two substrates 10 and 20 are arranged in parallel to the two substrates 10 and 20 because the orientation force due to rubbing is greater than the force exerted by the electric field.

In this narrow viewing angle mode, the liquid crystal molecules 81 arranged perpendicular to the two substrates 10 and 20 do not affect the retardation of light traveling in front of the two substrates 10 and 20. However, as the linearly polarized light passes through the first liquid crystal layer 80 made of the liquid crystal molecules 81, the polarization state is changed by the delay. Since the difference in the ratio of the polarization state changes farther from the front side occurs more severely. The contrast ratio is reduced, resulting in a narrow viewing angle. That is, when the electric field is applied to the first liquid crystal layer 80 added for the purpose of controlling the viewing angle, the viewing angle of the liquid crystal display is lowered to narrow the viewing angle.

3 is a graph illustrating a relationship between a viewing angle and luminance when the liquid crystal display of FIGS. 1 and 2 is in the wide viewing angle mode.

In the wide viewing angle mode, as shown in FIG. 3, the white and black states according to the applied voltage hardly change in the viewing angle direction so that gray inversion does not appear.

Next, in the narrow viewing angle mode, unlike the wide viewing angle mode, when a voltage of 3 V or more (generally, a voltage higher than a threshold voltage) is applied to the first liquid crystal layer 80, the liquid crystal molecules 81 of the first liquid crystal layer 80 are applied. As a result of polarization, the viewing angle characteristic at the side surface is deteriorated, so that the liquid crystal display may be in the narrow viewing angle mode as a whole.

4 is a graph illustrating a relationship between a viewing angle and luminance when the liquid crystal display of FIGS. 1 and 2 is in the narrow viewing angle mode.

Referring to FIG. 4, it can be seen that the luminance of the liquid crystal display according to the viewing angle direction of the entire liquid crystal display device is significantly changed in the black state by the voltage applied to the first liquid crystal layer 80.

As described above, since the narrow viewing angle and the wide viewing angle mode may be switched through one liquid crystal display, a flexible viewing angle characteristic may be exhibited as needed.

In order to prevent deterioration of the internal liquid crystal and to improve display quality of an image, such a liquid crystal panel is generally driven using an inversion driving method of inverting polarity by a predetermined unit.

The inversion driving method is classified into a frame inversion method, a line inversion method, and a dot inversion method according to the unit of polarity inversion.

5 and 6 are schematic diagrams illustrating an inversion driving method of a liquid crystal display according to the related art. FIG. 5 illustrates a dot inversion driving method in a conventional RGB pixel structure, and FIG. The dot inversion driving method is shown.

However, when the viewing angle characteristic of the liquid crystal display device is adjusted through such a structure, a separate liquid crystal panel for adjusting the viewing angle is used in addition to the liquid crystal panel displaying an image, and thus there is a problem in that cost or manufacturing process is additionally generated.

Also, in this structure, regardless of the pixel data of the liquid crystal panel displaying an image, the wide viewing angle mode and the narrow viewing angle mode are simply switched according to whether or not the voltage of the liquid crystal panel for viewing angle adjustment is applied, so that power consumption is unnecessary. There was this. That is, the pixel-by-pixel control of the liquid crystal panel for adjusting the viewing angle is not made, and the liquid crystal panel displaying the image does not consider whether the pixel data is the black level or the white level, and in any case the same level of voltage is applied to the liquid crystal panel. The power consumption is increased by controlling the switching operation.

Therefore, the technical problem to be achieved by the present invention is to configure the viewing angle control pixels, and to generate and apply the pixel data for viewing angle control in accordance with the pixel data of the adjacent color pixels or the characteristics of the liquid crystal, and to control the viewing angle in units of pixels The present invention provides a liquid crystal display capable of maximally reducing left and right viewing angles in a narrow viewing angle mode while minimizing power consumption by making the most of liquid crystal characteristics.

The technical objects to be achieved by the present invention are not limited to the technical matters mentioned above, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

The liquid crystal display according to the exemplary embodiment of the present invention for achieving the technical problem faces an array substrate and an array substrate divided in pixel units by horizontal gate lines and vertical data lines crossing each other. A visible color filter substrate, a liquid crystal layer formed between the color filter substrate and the array substrate, and a red, green, and blue color formed on the array substrate and forming a horizontal electric field to control the alignment of the liquid crystal layer. A plurality of group pixels comprising pixels, a viewing angle control pixel disposed adjacent to the color pixels and forming a vertical electric field to control the alignment of the liquid crystal layer, and the color to face each of the color pixels. Corresponding to the red, green, and blue color filters formed on the filter substrate and the pixel data of the color pixels. And a driving unit configured to apply the dot voltage and the frame inversion when the group pixels are driven by applying a field voltage and a viewing angle control voltage corresponding to the pixel data of the viewing angle control pixel. .

Each of the plurality of group pixels may include the red and green color pixels in a horizontal direction, and the viewing angle control pixel may be disposed in a diagonal direction of the green color pixel and adjacent to the red color pixel in a vertical direction. It is formed in parallel with the color pixels in the horizontal direction.

The driving unit drives the group pixels in a horizontal two-dot inversion manner, and drives the two viewing angle control pixels to have different polarities in two adjacent group pixels in the horizontal direction of the reference frame. The group pixels may be driven in a frame inversion scheme that inverts the polarity of the reference frame for each pixel.

The driving unit is a frame that drives the viewing angle control pixels to have different polarities for each of the two group pixels in four group pixels adjacent in the horizontal direction of the reference frame, and inverts the polarity of the reference frame for each pixel in the next frame. The group pixels may be driven in a version manner.

The driving unit drives the group pixels while alternating a 2-dot inversion method and a dot inversion method in a vertical direction, so that two viewing angle control pixels have different polarities in two group pixels adjacent in a horizontal direction of a reference frame. The group pixels may be driven by a frame inversion method of driving and inverting the polarity of the reference frame for each pixel in the next frame.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, a liquid crystal display capable of controlling the viewing angle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 7 is a schematic structural diagram of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 8 is a plan view schematically illustrating a part of an array substrate constituting the liquid crystal panel of FIG. 7.

Referring to FIG. 7, the liquid crystal display according to the exemplary embodiment may be largely divided into a liquid crystal panel 100 and a driver 200 for driving the liquid crystal panel 100.

The array substrate 110 of the liquid crystal panel 100 crosses n gate lines GL1, GL2, GL3,..., GLn and m data lines DL1, DL2, DL3,..., DLm in a matrix form. It is arranged to distinguish the plurality of pixels (R, G, B, E). In the following description, when no division is necessary, the n gate lines GL1, GL2, GL3,..., GLm and the m data lines DL1, DL2, DL3,..., DLm are divided into gate lines GL. And data lines DL collectively.

As shown in FIG. 8, the group pixel GP includes four pixels adjacent to each other, that is, a quad consisting of red, green, and blue color pixels R, G, and B, and a viewing angle control pixel E. FIG. It consists of a type. In each group pixel GP, red and green color pixels R and G are formed side by side in the horizontal direction, and the viewing angle control pixel E is disposed in a diagonal direction of the green color pixel G so that the red color pixel ( Adjacent to R) in the vertical direction, they are formed in parallel with the blue color pixel B in the horizontal direction.

As described above, in the structure in which the red, green, and blue color pixels R, G, and B and the viewing angle control pixel E form one group pixel GP, the red, green, and blue color pixels R, G By narrowing the left and right viewing angles by matching the amount of light that passes through B) with the amount of light that passes through the viewing angle control pixel (E), allowing similar grays to be displayed on the two types of pixels. Is to implement

The driver 200 may include a gate driver 210 for driving the gate lines GL of the liquid crystal panel 100, and a timing controller 230 for controlling driving timings of the gate driver 210 and the data driver 220. ) And the like.

The timing controller 230 controls the gate driver 210 using the vertical and horizontal synchronization signals Hsync and Vsync, the clock CLK, and the data enable signal DE input from an external system (not shown). A gate control signal GCS for generating the data and a data control signal DCS for controlling the data driver 220, and the pixel data of the color pixels R, G, and B transmitted from a system (not shown). (DATA1) is supplied.

The gate control signal GCS includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable (GOE), and the data control signal DCS. ) Includes a source start pulse (SSP), a source shift clock (SSC), a source output enable (SOC), a polarity inversion signal (POL), and the like.

In addition, the timing controller 230 calculates the pixel data DATA2 of the viewing angle control pixel E by using the pixel data DATA1 of the color pixels R, G, and B, and calculates the calculated viewing angle control pixel E. ) Is supplied to the data driver 220 along with the pixel data DATA1 of the color pixels R, G, and B.

The gate driver 210 sequentially supplies scan pulses to the gate lines GL in response to the gate control signal GCS transmitted from the timing controller 230, thereby connecting the thin film transistors connected to the gate lines GL. TFT1 and TFT2 (see FIG. 7) are driven for each gate line.

The data driver 220 latches the pixel data DATA1 of the color pixels R, G, and B and the pixel data DATA2 of the viewing angle control pixel E transmitted from the timing controller 230, and then latches the pixel data DATA2. The pixel data is converted into an analog data value and a viewing angle control voltage according to the gamma voltage, and the data voltage and the viewing angle control voltage are simultaneously supplied to the data lines DL in every horizontal synchronizing period.

In the liquid crystal display, when a scan pulse is supplied through the gate lines GL, data is transmitted to the data lines DL connected to the red, green, and blue color filters R, G, and B in response to the scan pulse. The voltage is applied to each of the data lines DL of the viewing angle control pixel E, and the viewing angle control voltage is applied to form a horizontal electric field and a vertical electric field for each region on the liquid crystal panel 100 to display an image.

In addition, when driving the group pixels GP on the liquid crystal panel 100, the driving unit 200 improves image quality by applying a dot inversion and a frame inversion to minimize crosstalk and flicker.

FIG. 9 is a plan view illustrating a portion of FIG. 8 in more detail, and FIG. 10 is a cross-sectional view schematically illustrating a line of FIG. 9 and illustrates a structure of a viewing angle control pixel E and a structure of a blue color pixel B. FIG. Representatively.

9 and 10, the liquid crystal panel 100 includes an array substrate 110 for controlling the amount of light transmitted through the color filter substrate 120 by controlling the alignment of the liquid crystal layer 130, and for each wavelength. Red, green, and blue color pixels R, G, and B, which transmit light, are formed to have a color filter substrate 120 displaying an image, and a liquid crystal layer 130 formed between the two substrates 110 and 120. do.

Each group pixel GP on the array substrate 110 forms a horizontal electric field to form a vertical electric field with color pixels R, G, and B that control the alignment of the liquid crystal layer 130, and forms a vertical electric field. The viewing angle control pixel E for controlling the orientation of?

The red, green, and blue color pixels R, G, and B and the viewing angle control pixel E are respectively formed by the gate lines GL and the data lines DL formed to cross each other in the vertical and horizontal directions. The area of is defined.

Here, the red, green, and blue color pixels R, G, and B and the viewing angle control pixel E are each formed of an IPS (In-Plane Switching) structure and an electrically controlled Birefringence (ECB) structure, thereby driving voltage (data voltage). Or when the viewing angle control voltage and the difference voltage of the common voltage) are applied, respectively, to form a horizontal electric field and a vertical electric field.

In the blue color pixel B, the pixel thin film transistor TFT1 is positioned at the intersection of the gate line GL2 and the data line DL2, and the pixel line 113 connected to the pixel thin film transistor TFT1 is the gate line GL2. ) Is arranged in a direction parallel to. The first pixel electrodes 114 are connected to the pixel line 113 in a direction parallel to the data line DL2, and the first common electrodes 116 are formed to cross the first pixel electrodes 114. . The first common electrodes 116 are connected to each other through a common line 115 parallel to the gate line GL2.

As described above, the red, green, and blue color pixels R, G, and B have a gate line GL and a data line DL intersecting with each other, and a pixel thin film formed at an intersection thereof to operate as a switching element. The transistor TFT1 may be implemented in various forms within the range of the transverse electric field structure in which the first common electrode 114 and the first pixel electrode 116 alternately cross each other to generate the transverse electric field.

For example, the first pixel electrodes 114 and the first common electrodes 116 may be configured in a straight line parallel to each other, and as shown in FIG. 8, the first pixel electrodes 114 and the first common electrodes 116 may be bent at least once and the alignment direction of the liquid crystal therebetween. The different multi-domains D1, D2, and D3 may be formed. When the pixels have a curved structure, the response speed, color shift, and the like are improved, thereby improving image quality.

On the viewing angle control pixel E, the viewing angle control thin film transistor TFT2 is disposed at the intersection of the gate line GL2 and the data line DL1, and the second pixel electrode 117 connected thereto and the second pixel electrode The viewing angle control voltage Vpxl_2 and the common voltage Vcom are applied to the second common electrode 122 on the color filter substrate 120 opposite to 117 to control the viewing angle while forming a vertical electric field.

In the case of FIG. 10, as the blue color filter 123 is formed in the area on the color filter substrate 120 opposite the blue color pixel B, the red, green, and blue color filters are formed so that the color pixels R, Corresponding to each of G and B), a second common electrode 122 is formed on the viewing angle control pixel E to form a vertical electric field together with the second pixel electrode 117.

Each group pixel GP includes a driving voltage charged in the liquid crystal cell, that is, a difference voltage between the data voltage Vpxl_1 and the common voltage Vcom applied to the first pixel electrode 114, or the viewing angle control voltage Vpxl_2. The storage capacitor Cst is configured to maintain the difference voltage between the and the common voltage Vcom until the next voltage is charged. The storage capacitor Cst may be formed through a structure of the common line 115 and the pixel electrodes 114 and 117 overlapping each other with one or more insulating layers 112 interposed therebetween.

FIG. 11 is a schematic diagram illustrating arrangement of color pixels constituting a group pixel and a viewing angle control pixel in an embodiment of the present invention, wherein the color pixels R, G, and B, and the viewing angle control pixel E FIG. 1 illustrates a case in which one group pixel GP is adjacent to each other and group pixels GP having the same pixel arrangement are repeatedly formed.

Referring to FIG. 11, the red and green color pixels R and G formed side by side in the horizontal direction and the viewing angle control pixel E and the blue control pixel B also formed in parallel in the horizontal direction are vertically adjacent to each other. have.

The pixel data of the viewing angle control pixel E may be generated from the pixel data of the color pixels R, G, and B that form the same group pixel GP. However, when the viewing angle control pixel E is driven and operated, it affects the left and right viewing angles to other adjacent group pixels GP. Therefore, when generating the pixel data of the viewing angle control pixel E, the pixels of all the color pixels located in the surrounding area are generated. All data needs to be considered.

Accordingly, the pixel data of the viewing angle control pixel E may be calculated as an arithmetic mean value of the pixel data of the color pixels R, G, and B disposed to be adjacent to the periphery.

In addition, since the degree of influence of the peripheral color pixels R, G, and B on the viewing angle control pixel E depends on the position of each color pixel, the peripheral color pixels R, G, and B It is calculated as the average value of the pixel data of the, but may be calculated by giving a weight for each pixel data of the color pixels (R, G, B). In this case, the weight for each pixel data is set according to the positions of the color pixels R, G, and B disposed to be adjacent to the viewing angle control pixel E. FIG.

The pixel data of the viewing angle control pixel E generated as described above is considered in consideration of voltage characteristics of pixel data of the color pixels R, G, and B and voltage characteristics of pixel data of the viewing angle control pixel E. It should be calibrated using Look-Up Table.

Since the color pixels R, G, and B are formed of an IPS structure generating a horizontal electric field, and the viewing angle control pixel E is formed of an ECB structure generating a vertical electric field, the two types of pixels have different driving characteristics. Since the data driver 220 generates the voltage (data) for each pixel data according to the driving characteristics of the color pixels R, G, and B, which are predetermined for the color pixels, the data driver 220 generates the voltage of the viewing angle control pixel E. The conversion is made according to the driving characteristics.

For example, in the case of 8-bit driving, since the driver chip used as the data driver 220 receives only a limited range of pixel data, the pixel data of the viewing angle control pixel E may be converted into the color pixels R, G, and B. It should be converted to a value between 0 and 255, which is the range of pixel data. To this end, the timing controller 230 corrects the calculated pixel data value through the lookup table and transfers the calculated pixel data value to the data driver 220.

As such, in the structure of FIG. 9, the pixel data of the viewing angle control pixel E is generated by the pixel data of the color pixels R, G, and B located in the periphery thereof, and the viewing angle characteristic is controlled by the value.

As a result, according to the present invention, the viewing angle according to the pixel data of the color pixels R, G, B or the characteristics of the liquid crystal used for the color pixels R, G, B and the viewing angle control pixels E. Pixel data of the control pixel E is variably determined.

Therefore, since the pixel data of the viewing angle control pixel E is actively changed in accordance with the brightness of the surrounding color pixels R, G, and B, the viewing angle control pixel E in any case including the black state or the white state is By adjusting the pixel data, the viewing angle control ability can be optimized. In addition, since the pixel data of the viewing angle control pixels E may be generated and corrected according to the characteristics of the liquid crystal, the characteristics of the liquid crystal may be maximized.

12 to 14 are model views illustrating various inversion driving schemes applied to a liquid crystal display according to an exemplary embodiment of the present invention, wherein the Nth frame and N + 1 through (a) and (b) are illustrated. Each inversion driving method of the first frame is shown.

According to the present invention, since the liquid crystal panel of the cell type (in-cell type) consisting of the viewing angle control pixel (E) is configured, and has a pixel structure of a different form than the conventional one, the conventional inversion driving as shown in Figs. The method is difficult to apply.

In addition, even when the liquid crystal panel is driven by applying the conventional method of FIG. 6 to the present invention, it is inevitable that severe flicker occurs and the image quality is deteriorated. In particular, when a single color such as red, green, and blue is expressed, flicker is easily detected, and an inversion driving method as shown in FIGS. 12 to 14 is applied to improve this phenomenon.

FIG. 12 is a horizontal two-dot inversion scheme, which is set such that polarity is balanced for each group pixel GP even when a single color such as red, green, or blue is expressed. In addition, the polarities of the voltages driving the specific pixels R, G, B, and E are balanced in order to balance the polarities between the frames in one pixel R, G, B, and E. Set.

Referring to FIG. 12, two viewing angle control pixels E in two group pixels GP adjacent in the horizontal direction in the Nth frame of (a) are driven to have different polarities, and N + 1 of (b). The group pixels GP are driven in a frame inversion scheme in which the polarity of the Nth frame is inverted pixel by pixel in the first frame.

FIG. 13 is an inversion driving method in which voltages of respective fields are balanced while being stored in time and space. When driving as shown in FIG. 13, horizontal crosstalk generated by the inversion driving method as shown in FIG. 6 or flicker in an oblique direction can be solved. Each polarity is expressed even when pure colors of red, green, and blue are expressed. The voltage at is balanced and stored in the storage capacitor (Cst).

Referring to FIG. 13, the viewing angle control pixels E in the four group pixels GP adjacent in the horizontal direction in the Nth frame of (a) are driven to have different polarities for each of the two group pixels GP, The group pixels GP are driven in a frame inversion scheme in which the polarity of the Nth frame is inverted for each pixel in the N + 1th frame of (b).

In the case of FIG. 14, the first group of pixels GP1 is driven in a vertical two-dot inversion manner, and the second group of pixels GP2 is driven in a dot inversion manner, thereby driving pure red, green, and blue colors. It is designed to reduce flicker or horizontal crosstalk, which can occur when only one is expressed.

Referring to FIG. 14, in the Nth frame of (a), the group pixels GP are driven while the two dot inversion method and the dot inversion method in the vertical direction are alternated, and two group pixels adjacent to each other in the horizontal direction ( The two viewing angle control pixels E in GP) are driven to have different polarities. In the N + 1 th frame of (b), the group pixels GP are driven in a frame inversion scheme that inverts the polarity of the N th frame for each pixel.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

In the liquid crystal display according to the preferred embodiment of the present invention, the viewing angle control pixels are configured, and the pixel data are variably generated and applied according to pixel data of adjacent color pixels or characteristics of the liquid crystal, and the like. The viewing angle can be controlled and the left and right viewing angles can be reduced to the maximum in the narrow viewing angle mode while minimizing power consumption by maximizing the characteristics of the liquid crystal.

Claims (5)

An array substrate divided in pixel units by horizontal gate lines and vertical data lines crossing each other and a color filter substrate facing the array substrate; A liquid crystal layer formed between the color filter substrate and the array substrate; Red, green and blue color pixels formed on the array substrate to form a horizontal electric field to control the alignment of the liquid crystal layer, and are disposed to be adjacent to the color pixels, and form a vertical electric field to form the liquid crystal layer. A plurality of group pixels consisting of a viewing angle control pixel for controlling the orientation of; Red, green, and blue color filters formed on the color filter substrate so as to face each of the color pixels; And The group pixels are driven by applying a data voltage corresponding to the pixel data of the color pixels and a viewing angle control voltage corresponding to the pixel data of the viewing angle control pixel, and applying dot inversion and frame inversion when driving the group pixels. And a driving unit. The method of claim 1, Each of the plurality of group pixels, The red and green color pixels are formed side by side in the horizontal direction, and the viewing angle control pixel is disposed in the diagonal direction of the green color pixel and is adjacent to the red color pixel in the vertical direction, and is formed in the horizontal direction parallel to the blue color pixel. A liquid crystal display device, characterized in that. 3. The method of claim 2, The driving unit includes: The group pixels are driven in a horizontal two-dot inversion manner, and the two viewing angle control pixels are driven to have different polarities in two adjacent group pixels in the horizontal direction of the reference frame, and the polarity of the reference frame in the next frame. And driving the group pixels in a frame inversion scheme that inverts the pixels for each pixel. 3. The method of claim 2, The driving unit includes: In the four group pixels adjacent to each other in the horizontal direction of the reference frame, the viewing angle control pixels are driven to have different polarities for each of the two group pixels, and in the next frame, the group is in a frame inversion scheme that inverts the polarity of the reference frame for each pixel. A liquid crystal display device for driving pixels. 3. The method of claim 2, The driving unit includes: The group pixels are driven while alternating the two-dot inversion method and the dot inversion method in the vertical direction, and the two viewing angle control pixels are driven to have different polarities in two adjacent group pixels in the horizontal direction of the reference frame. And driving the group pixels in a frame inversion scheme that inverts the polarity of the reference frame for each pixel in a frame.

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