KR101763942B1 - Stereoscopic Image Display Device - Google Patents

Abstract

An embodiment of the present invention relates to a liquid crystal panel having a quad-type RGBW pixel structure in which one subpixel has a square shape; A pattern driver that separates the image displayed on the liquid crystal panel into a left eye image and a right eye image by a line by line method; And a rendering unit for rendering the image signal so as to form one pixel by reflecting grayscale data of peripheral subpixels positioned in the vertical direction and the horizontal direction based on one subpixel included in the quad-type RGBW pixel. The rendering unit renders the image signal so that the gray level data corresponding to the line area not displayed by the pattern drifter is included when the mode is switched so that the liquid crystal panel displays the three-dimensional image.

Description

[0001] The present invention relates to a stereoscopic image display device,

An embodiment of the present invention relates to a stereoscopic image display device.

The stereoscopic image display device is divided into a stereoscopic technique and an autostereoscopic technique.

The binocular parallax method uses the parallax images of the left and right eyes with large stereoscopic effects. In the binocular parallax system, there are a glasses system and a non-glasses system, and both systems are now practically used. In the spectacle method, the polarizing direction of the right and left parallax images is changed in a time-division manner to a direct-view liquid crystal panel or a projector, and a stereoscopic image is implemented using polarizing glasses or liquid crystal shutter glasses. In the non-eyeglass system, an optical plate such as a parallax barrier for separating the optical axis of left and right parallax images is installed in front of or behind the liquid crystal panel.

In recent years, patterned retarders, which are optical films that change optical modulation characteristics by patterns, have been increasingly applied to stereoscopic image display devices due to commercialization of stereoscopic image display devices and development of various technologies.

The pattern-driven retarder mixes the left-eye image and the right-eye image in a line-by-line manner and displays them in an interlace manner. To this end, the patterned retarder polarizes the odd lines to right circularly polarized light and the even lines to left circularly polarized light (or vice versa) to separate the image displayed on the liquid crystal panel.

As described above, the patterned retarder has a spatial division structure (a black stripe exists correspondingly between pixels) because the polarization characteristic is fixed due to its structural characteristics. Therefore, in the conventional stereoscopic image display device, when the patterned retarder is used, there is a problem that the resolution of the stereoscopic image is reduced to half on the monocular basis due to the change of the spatially defined polarization, and the improvement is required.

According to an embodiment of the present invention, a pixel structure is designed to have at least two sub-pixel divisions in the vertical direction and a sub-pixel is rendered for a video signal to correspond to the structure, And to provide a stereoscopic image display device capable of solving the problem of degradation in half.

According to an embodiment of the present invention, there is provided a liquid crystal panel having a quadrangular RGBW pixel structure in which one subpixel has a square shape; A pattern driver that separates the image displayed on the liquid crystal panel into a left eye image and a right eye image by a line by line method; And a rendering unit for rendering the image signal so as to form one pixel by reflecting grayscale data of peripheral subpixels positioned in the vertical direction and the horizontal direction based on one subpixel included in the quad-type RGBW pixel, Lt; / RTI >

When the mode is switched so that the liquid crystal panel displays the stereoscopic image, the rendering unit may render the image signal so that the gray level data corresponding to the line area not displayed by the patterned retarder is included.

The rendering unit may render the image signal so that the gray scale data corresponding to the upper line area and the lower line area, which are not displayed by the liquid crystal panel, are included.

The rendering unit may convert an RGB image signal supplied from the outside into an RGBW image signal and render the RGBW image signal converted based on the quad-type RGBW pixel structure formed on the liquid crystal panel.

The rendering unit may render the image signal in units of at least 3 × 3 sub-pixels in consideration of the area covered by one sub-pixel.

According to another aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel having a horizontal RGB pixel structure in which one subpixel is rectangular in a horizontal direction; A pattern driver that separates the image displayed on the liquid crystal panel into a left eye image and a right eye image by a line by line method; And a rendering unit for rendering the image signal so as to form one pixel by reflecting grayscale data of peripheral subpixels positioned in the vertical direction based on one subpixel included in the horizontal RGB pixels do.

When the mode is switched so that the liquid crystal panel displays the stereoscopic image, the rendering unit may render the image signal so that the gray level data corresponding to the line area not displayed by the patterned retarder is included.

The rendering unit may render the image signal so that the gray scale data corresponding to the upper line area and the lower line area, which are not displayed by the liquid crystal panel, are included.

The rendering unit may render the RGB image signals supplied from the outside based on the horizontal RGB pixel structure formed on the liquid crystal panel.

The rendering unit may render the image signal in units of at least 3 × 3 sub-pixels in consideration of the area covered by one sub-pixel.

The embodiment of the present invention can design a pixel structure so that subpixel segmentation is made in at least two in the vertical direction and perform subpixel rendering on a video signal so as to correspond to the structure, There is an effect of providing a stereoscopic image display device. In addition, the embodiment of the present invention provides a stereoscopic image display device capable of compensating resolution degradation by participating in subpixel rendering of gradation data of subpixels located in an area not shown in the liquid crystal panel due to the structural characteristics of the patterned retarder It is effective.

1 is a schematic view of a stereoscopic image display apparatus.
2 is a diagram illustrating a pixel structure of a liquid crystal panel according to a first embodiment of the present invention.
FIG. 3 is a view for explaining a state when a liquid crystal panel having the structure of FIG. 2 displays a stereoscopic image. FIG.
4 is a block diagram for explaining a rendering unit according to the first embodiment of the present invention;
5 to 8 are views for explaining a rendering method according to the first embodiment of the present invention.
9 is a view showing a pixel structure of a liquid crystal panel according to a second embodiment of the present invention.
FIG. 10 is a view for explaining a state when a liquid crystal panel having the structure of FIG. 9 displays a stereoscopic image. FIG.
11 is a block diagram for explaining a rendering unit according to a second embodiment of the present invention;
12 to 14 are diagrams for explaining a rendering method according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a stereoscopic image display apparatus.

1, a stereoscopic image display device includes an image supply unit SBD, a timing control unit TCN, a driving unit DRV, a display panel PNL, a patterned retarder PRF, and polarizing glasses GLS, .

The image supply unit (SBD) generates 2D image frame data in a two-dimensional mode (2D mode) and 3D image frame data in a three-dimensional mode (3D mode). The image supply unit SBD supplies the timing control unit TCN with timing signals and video frame data such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock do. The image supply unit SBD is selected in a 2D or 3D mode according to a user selection input through the user interface, generates image frame data corresponding thereto, and supplies the image frame data to the timing control unit TCN. The user interface includes user input means such as an OSD (On Screen Display), a remote controller, a keyboard, and a mouse. Hereinafter, an example will be described in which the image supply unit (SBD) is selected as the 3D mode and supplies the 3D image frame data to the timing control unit (TCN).

The timing control unit TCN receives 3D image frame data including left eye image frame data and right eye image frame data from the image supply unit SBD. The timing controller TCN alternately supplies the left eye image frame data and the right eye image frame data to the driver DRV at a frame frequency of 120 Hz or more. In addition, the timing control unit TCN supplies a control signal corresponding to the image frame data to the driving unit DRV.

The driving unit DRV includes a data driver connected to the data lines to supply a data signal, and a gate driver connected to the gate lines and supplying a gate signal. The driving unit DRV converts the digital left-eye and right-eye image frame data into analog left-eye and right-eye image frame data under the control of the timing control unit TCN and supplies them to the data lines. The driving unit DRV sequentially supplies the gate signals to the gate lines under the control of the timing control unit TCN.

The display panel PNL receives a gate signal and a data signal from the driver DRV and displays a two-dimensional image or a three-dimensional image corresponding thereto. The display panel PNL includes a backlight unit BLU and a liquid crystal panel (LCD).

A liquid crystal panel (LCD) includes a thin film transistor substrate (hereinafter referred to as a TFT substrate) on which a thin film transistor (TFT) and a capacitor are formed, and a color filter substrate on which a color filter and a black matrix are formed. In the liquid crystal panel (LCD), subpixels including a liquid crystal layer formed between the TFT substrate and the color filter substrate are formed.

The liquid crystal panel (LCD) may be implemented in liquid crystal modes such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode.

The lower polarizer plate POL1 and the upper polarizer plate POL2 are attached to the TFT substrate of the liquid crystal panel (LCD) and the color filter substrate, respectively. The liquid crystal panel (LCD) thus configured is capable of displaying an image by the light provided from the backlight unit (BLU).

The backlight unit BLU is driven under the control of the image supply unit SBD or the timing control unit TCN to provide light to the liquid crystal panel LCD. The backlight unit BLU includes a light source for emitting light, a light guide plate for guiding the light emitted from the light source in the direction of the liquid crystal panel (LCD), and an optical member for diffusing and condensing the light emitted from the light guide plate. The backlight unit (BLU) is composed of an edge type, a dual type, a quad type, and a direct type. In the edge type, a light source is arranged on one side of a liquid crystal panel (LCD), a dual type is a light source is arranged on both sides of a liquid crystal panel (LCD), and a quad type is a light source is arranged on all sides of a liquid crystal panel And the direct type is a type in which a light source is disposed below a liquid crystal panel (LCD).

The patterned retarder (PRF) displays the left eye image and the right eye image displayed on the liquid crystal panel (LCD) in a line-by-line manner and interlaced. To this end, the patterned retarder PRF polarizes the odd line to right circularly polarized light R and the even line to left circularly polarized light L (or vice versa) to separate the image displayed on the liquid crystal panel (LCD).

Polarized Glasses (GLS) separates the image output through the patterned retarder (PRF) into a left eye image and a right eye image. The left eyeglasses LEFT of the polarizing glasses GLS transmit only the left eye image emitted through the patterned retarder PRF. On the other hand, the right eyeglasses RIGHT of the polarizing glasses GLS transmit only the right eye image emitted through the patterned retarder PRF.

According to the above structure, when the left eye image and the right eye image are alternately displayed on the liquid crystal panel LCD by frame, the pattern drift PRF separates the left eye image and the right eye image, Dimensional stereoscopic image can be appreciated through the three-dimensional image.

Hereinafter, a stereoscopic image display apparatus according to an embodiment of the present invention will be described in more detail.

≪ Embodiment 1 >

FIG. 2 is a view showing a pixel structure of a liquid crystal panel according to a first embodiment of the present invention, FIG. 3 is a view for explaining a state when a liquid crystal panel having the structure of FIG. 2 displays a stereoscopic image, 4 is a block diagram for explaining a rendering unit according to the first embodiment of the present invention, and FIGS. 5 to 8 are views for explaining a rendering method according to the first embodiment of the present invention.

1 and 2, a liquid crystal panel (LCD) constituting the stereoscopic image display device according to the first embodiment of the present invention includes quad-type RGBW (red, green, and blue) in which one subpixel SP has a square shape, Green, blue and white) pixel (P) structure.

In the case of a liquid crystal panel (LCD) having the structure shown in FIG. 2, when a stereoscopic image is displayed, the first line L1 and the third line L3 display an image, ) And the fourth line (L4) are not displayed. This is because the liquid crystal panel (LCD) and the patterned retarder (PRF) are used to display and separate images in line-by-line to realize stereoscopic images.

When a liquid crystal panel (LCD) having the structure shown in FIG. 2 displays a two-dimensional image, even when having a resolution of FHD (Full High Definition), when displaying a three-dimensional image, the image displayed on the liquid crystal panel The resolution of the FHD is not implemented on a monocular basis by image separation of the further (PRF). Therefore, when a liquid crystal panel (LCD) is driven as a stereoscopic image by using a conventional method, the left-eye image and the right-eye image are alternately displayed in a line-by-line manner, so that the resolution is reduced based on the left eye image and the right eye image.

In order to solve the above problem, the first embodiment allows surrounding subpixels to participate in the main subpixel through image processing called subpixel rendering. To this end, in the first embodiment, a liquid crystal panel (LCD) having a quad-type RGBW pixel (P) structure having two sub-pixel (SP) subdivisions in the vertical direction is used.

Rendering refers to rendering RGB subpixels separately when displaying an image and simultaneously driving subpixels located in the periphery of a subpixel to be driven so that the brightness is dispersed along with surrounding subpixels, Is a technology capable of expressing more precisely and adjusting the resolution.

As shown in FIG. 4, the rendering unit (RND) for performing subpixel rendering may be included in the image supply unit (SBD). The rendering unit RND included in the image supply unit SBD converts an RGB image signal supplied from the outside into an RGBW image signal and converts the converted RGBW image signal based on a quad-type RGBW pixel (P) structure formed on a liquid crystal panel (LCD) To / R / G / B / W video signals. The rendering unit RND can perform filtering (high-pass filtering) to clearly set the outline of the / R / G / B / W video signal rendered as described above.

The rendering unit (RND) extracts white components from each of the three-color binary RGB image signals and performs half-tone processing on the white components to generate RGBW image signals of four colors. A method of subtracting the pixel value from the increase value and using it as the input value of the white component and using the increment of the RGB image signal other than the white difference reduction amount as the output signal of the remaining image signal may be used. Do not.

The R / G / B / W video signal rendered by the rendering unit (RND) is supplied to the timing control unit (TCN) in units of frames through a buffer unit (BUF) such as a memory. Then, the timing controller TCN alternately supplies / R / G / B / W image signals composed of the left eye image frame data and the right eye image frame data to the data driver DDRV.

The rendering unit RND reflects grayscale data of peripheral subpixels positioned in the vertical and horizontal directions on the basis of one subpixel SP included in the quad-type RGBW pixel P, Lt; / RTI >

The rendering unit RND renders the image signal so that the gray level data corresponding to the line area not displayed by the liquid crystal panel LCD is included when the mode is switched so that the liquid crystal panel LCD displays the stereoscopic image.

When the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the R sub-pixel in FIG. 5, the rendering unit RND scans the vertical direction And the grayscale data of the neighboring subpixels positioned in the horizontal direction are reflected to render a video signal so as to form one pixel. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

Similarly, when the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the G sub-pixel of FIG. 6, the rendering unit RND references the G sub- And the image signal is rendered to form one pixel by reflecting the grayscale data of the peripheral subpixels located in the vertical direction and the horizontal direction. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

Similarly, when the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the B sub-pixel of FIG. 7, the rendering unit RND references the B sub-pixel B as a reference And the image signal is rendered to form one pixel by reflecting the grayscale data of the peripheral subpixels located in the vertical direction and the horizontal direction. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

Similarly, when the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the W sub-pixel of FIG. 8, the rendering unit RND references the W sub-pixel W as a reference And the image signal is rendered to form one pixel by reflecting the grayscale data of the peripheral subpixels located in the vertical direction and the horizontal direction. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

That is, although the gray scale data corresponding to the upper line area L2 and the lower line area L4 are not actually displayed on the liquid crystal panel LCD by the above rendering method, The peripheral sub-pixels are reflected on the basis of the sub-pixels being the reference.

Here, the numerical values shown in FIGS. 5 to 8 show an example in which subpixels that are main and peripheral subpixels are divided by area ratio when rendering an image signal for 3 × 3 subpixels. Although the rendering unit (RND) of the first embodiment has rendered an image signal for 3 × 3 subpixels as an example, it may be composed of more matrices such as 5 × 5 subpixel units or the like. That is, the rendering unit (RND) of the first embodiment can derive the rendering area in consideration of the area covered by each subpixel.

≪ Embodiment 2 >

FIG. 9 is a view showing a pixel structure of a liquid crystal panel according to a second embodiment of the present invention, FIG. 10 is a view for explaining a state when a liquid crystal panel having the structure of FIG. 9 displays a stereoscopic image, 11 is a block diagram for explaining a rendering unit according to a second embodiment of the present invention, and FIGS. 12 to 14 are views for explaining a rendering method according to a second embodiment of the present invention.

1 and 9, a liquid crystal panel (LCD) constituting a stereoscopic image display device according to a second embodiment of the present invention includes a subpixel SP having a horizontal RGB pixel (P) structure. Here, the horizontal direction means the gate line direction.

In the case of a liquid crystal panel (LCD) having the structure shown in FIG. 9, when a stereoscopic image is displayed, the first line L1 and the third line L3 display an image as shown in FIG. 10, ) And the fourth line (L4) are not displayed. This is because the liquid crystal panel (LCD) and the patterned retarder (PRF) are used to display and separate images in line-by-line to realize stereoscopic images.

When a liquid crystal panel (LCD) having the structure shown in FIG. 9 displays a two-dimensional image, even if it has a resolution of FHD (Full High Definition), when displaying a three-dimensional image, the image displayed on the liquid crystal panel The resolution of the FHD is not implemented on a monocular basis by image separation of the further (PRF). Therefore, when a liquid crystal panel (LCD) is driven as a stereoscopic image by using a conventional method, the left-eye image and the right-eye image are alternately displayed in a line-by-line manner, so that the resolution is reduced based on the left eye image and the right eye image.

In order to solve the above problem, the second embodiment allows surrounding subpixels to participate in the main subpixel through an image process called subpixel rendering. To this end, in the second embodiment, a liquid crystal panel (LCD) having a horizontal RGB pixel (P) structure having three sub-pixel divisions in the vertical direction is used.

As shown in FIG. 10, the rendering unit (RND) for performing subpixel rendering may be included in the image supply unit (SBD). The rendering unit RND included in the image supply unit SBD renders RGB image signals supplied from the outside into / R / G / B image signals based on a horizontal RGB pixel (P) structure formed on a liquid crystal panel (LCD) do. The rendering unit (RND) may perform filtering (high-pass filtering) to clearly set the outline of the / R / G / B video signal rendered as described above.

R / G / B video signals rendered by the rendering unit (RND) are supplied to the timing control unit (TCN) in units of frames through a buffer unit (BUF) such as a memory. Then, the timing controller TCN alternately supplies / R / G / B image signals composed of the left eye image frame data and the right eye image frame data to the data driver DDRV.

The rendering unit RND renders the image signal so as to form one pixel by reflecting the grayscale data of the peripheral subpixels positioned in the vertical direction on the basis of one subpixel SP included in the horizontal RGB pixel P do.

The rendering unit RND renders the image signal so that the gray level data corresponding to the line area not displayed by the liquid crystal panel LCD is included when the mode is switched so that the liquid crystal panel LCD displays the stereoscopic image.

When the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the R sub-pixel of FIG. 12, the rendering unit RND displays the stereoscopic image on the basis of the R sub- The gray scale data of the neighboring sub-pixels located in the sub-pixel are reflected to render a video signal to form one pixel. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

Similarly, when the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the G sub-pixel of FIG. 13, the rendering unit RND references the G sub-pixel G as a reference And the gray scale data of the peripheral sub-pixels located in the vertical direction is reflected to render the image signal so as to form one pixel. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

Similarly, when the mode is switched so that the liquid crystal panel (LCD) displays a stereoscopic image as shown in the B sub-pixel of FIG. 14, the rendering unit RND displays the stereoscopic image on the basis of the B sub- And the gray scale data of the peripheral sub-pixels located in the vertical direction is reflected to render the image signal so as to form one pixel. At this time, the rendering unit RND renders the image signal so as to include gray scale data corresponding to the upper line region L2 and the lower line region L4, which are not displayed by the liquid crystal panel LCD.

That is, although the gray scale data corresponding to the upper line area L2 and the lower line area L4 are not actually displayed on the liquid crystal panel LCD by the above rendering method, The peripheral sub-pixels are reflected on the basis of the sub-pixels being the reference.

Here, the numerical values shown in FIGS. 12 to 14 show examples in which subpixels and peripheral subpixels, which become main when the image signal is rendered for 3 × 3 subpixels, are divided by the area ratio. Although the rendering unit (RND) of the second embodiment has rendered an image signal for 3 × 3 subpixels as an example, it may be composed of more matrices such as 5 × 5 subpixel units or the like. That is, the rendering unit (RND) of the second embodiment can derive the rendering area in consideration of the area covered by each subpixel.

In the embodiment of the present invention, the pixel structure is designed so that the sub-pixel division is at least two in the vertical direction, and the sub-pixel rendering is performed on the image signal so as to correspond to the structure, The present invention can provide a stereoscopic image display device capable of solving the problem that the stereoscopic image display device can be improved. In addition, the embodiment of the present invention provides a stereoscopic image display device capable of compensating resolution degradation by participating in subpixel rendering of gradation data of subpixels located in an area not shown in the liquid crystal panel due to the structural characteristics of the patterned retarder It is effective.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

SBD: Image supply unit TCN: Timing control unit
DRV: driving part PNL: display panel
PRF: Patterned retarder GLS: Polarized glasses
LCD: liquid crystal panel RND:

Claims (10)

A liquid crystal panel having a quad-type RGBW pixel structure in which one subpixel has a square shape;
A pattern driver that separates the image displayed on the liquid crystal panel into a left eye image and a right eye image in a line by line manner; And
And a rendering unit that renders an image signal so as to form one pixel by reflecting grayscale data of peripheral subpixels located in the vertical direction and the horizontal direction based on one subpixel included in the quad-type RGBW pixel,
The rendering unit may include:
When the liquid crystal panel is switched to display a three-dimensional image,
And the image signal is rendered so as to include gray scale data corresponding to a line area not yet displayed by the pattern driver. delete The method according to claim 1,
The rendering unit may include:
And the gray scale data corresponding to an upper line area and a lower line area, which are not displayed by the liquid crystal panel, are included. The method according to claim 1,
The rendering unit may include:
And converts the RGB image signal supplied from the outside into an RGBW image signal and renders the converted RGBW image signal based on the quad-type RGBW pixel structure formed on the liquid crystal panel. The method according to claim 1,
The rendering unit may include:
And the image signal is rendered in units of at least 3 × 3 sub-pixels in consideration of the area covered by one sub-pixel. A liquid crystal panel having a horizontal RGB pixel structure in which one subpixel has a rectangular shape in a horizontal direction;
A pattern driver that separates the image displayed on the liquid crystal panel into a left eye image and a right eye image in a line by line manner; And
And a rendering unit for rendering the image signal so as to form one pixel by reflecting grayscale data of peripheral subpixels positioned in the vertical direction with respect to one subpixel included in the horizontal RGB pixels,
The rendering unit may include:
When the liquid crystal panel is switched to display a three-dimensional image,
And the image signal is rendered so as to include gray scale data corresponding to a line area not yet displayed by the pattern driver. delete The method according to claim 6,
The rendering unit may include:
And the gray scale data corresponding to an upper line area and a lower line area, which are not displayed by the liquid crystal panel, are included. The method according to claim 6,
The rendering unit may include:
Wherein the RGB image signal supplied from the outside is rendered based on the horizontal RGB pixel structure formed on the liquid crystal panel. The method according to claim 6,
The rendering unit may include:
And the image signal is rendered in units of at least 3 × 3 sub-pixels in consideration of the area covered by one sub-pixel.

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