KR102326620B1 - A display apparatus - Google Patents

Abstract

A display device is provided. The display device includes a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines, a light source sequentially supplying first color light, second color light, and third color light to the display substrate; A first filter region that transmits the first color light, a second filter region that transmits the second color light, a third filter region that transmits the third color light, and the first color light, the second color light, and a color filter including a fourth filter region for transmitting light of a third color, wherein the plurality of pixels are at least in a first pixel overlapping a first filter region of the color filter and in a second filter region of the color filter and a second pixel overlapping, a third pixel overlapping the third filter area of the color filter, and a fourth pixel overlapping the fourth filter area of the color filter.

Description

A display apparatus

The present invention relates to a display device, and more particularly, to a flat panel display device.

In general, a flat panel display displays a desired image by selectively transmitting a portion of light provided from a light source.

A significant amount of light provided from the light source is absorbed or reflected by various optical layers of the display device to be lost, and in terms of light energy, transmittance of the display device becomes an important factor in determining the quality of the display device.

A typical display device includes a color filter having a red filter area, a green filter area, and a blue filter area in order to express a desired image by combining light having three primary colors, that is, red, green, and blue colors. Since the color filter transmits light of a specific wavelength band and blocks or absorbs light of the other wavelengths, the presence of the color filter may be a major factor in reducing transmittance of the display device.

In order to increase transmittance by excluding the color filter from the display device, the light source distinguishes red light, green light, and blue light and provides it to the display panel, and the display panel temporally mixes the incident red light, green light, and blue light Therefore, there was an attempt to express the desired image.

However, such an attempt requires high-speed driving of the liquid crystal, but there is a limitation in the response speed of the liquid crystal. .

Accordingly, an object of the present invention is to provide a display device having improved transmittance.

Another object to be solved by the present invention is to provide a display device in consideration of the low response speed of liquid crystal at low temperature.

The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other problems that are not mentioned are those of ordinary skill in the technical field of the present invention from the description below (hereinafter, "those skilled in the art") ”) can be clearly understood.

According to an aspect of the present invention, there is provided a display device comprising: a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines; a light source for sequentially supplying a first color light, a second color light, and a third color light to the display substrate; A first filter region that transmits the first color light, a second filter region that transmits the second color light, a third filter region that transmits the third color light, and the first color light, the second color light, and a color filter including a fourth filter region for transmitting light of a third color, wherein the plurality of pixels are at least in a first pixel overlapping a first filter region of the color filter and in a second filter region of the color filter and a second pixel overlapping, a third pixel overlapping the third filter area of the color filter, and a fourth pixel overlapping the fourth filter area of the color filter.

Meanwhile, the first color light is red light, the second color light is green light, and the third color light is blue light.

Meanwhile, the first filter region is a red filter region that selectively passes red light, the second filter region is a green filter region that selectively passes green light, and the third filter region selectively passes blue light is a blue filter region, and the fourth filter is a white filter region that transmits all of the red light, green light, and blue light.

Meanwhile, the light source is a surface light source disposed on a surface opposite to a display surface of a display substrate, and the light source includes a plurality of blocks disposed in a matrix shape, and each of the plurality of blocks has an adjustable intensity of light emitted. .

Meanwhile, the light source includes a plurality of first color LEDs, a plurality of second color LEDs, and a plurality of third color LEDs, and includes a plurality of first color LEDs, a plurality of second color LEDs, and a plurality of third color LEDs. By sequentially turning on and off, the first color light, the second color light, and the third color light are sequentially supplied to the display substrate.

Meanwhile, the magnitude of the current or voltage provided to each block of the light source can be differently adjusted for each block according to an image image corresponding to each block.

Meanwhile, the light source includes first to nth block lines (n is a natural number greater than or equal to 2), each convex line includes one or more rows of the plurality of blocks, and the first to nth block lines are Light emission and extinction are sequentially performed from the first block line to the n-th block line.

Meanwhile, the time when one of the first to nth block lines emits light and the time at which the next block line emits light overlaps during the overlapping time.

Meanwhile, in the mixed field sequential driving mode, during a first sub-frame in which the first color light is provided, the first pixel and the fourth pixel adjust the degree of transmission of the first color light, and the second pixel and the third pixel During a second sub-frame in which the light of the first color is blocked and the light of the second color is provided, the second pixel and the fourth pixel adjust the degree of transmission of the light of the second color, and the first pixel and the third pixel The second color light is blocked, and during a third sub-frame in which the third color light is provided, the third pixel and the fourth pixel adjust the degree of transmission of the third color light, and the first pixel and the second pixel The third color light is blocked.

Meanwhile, in the low-temperature field sequential driving mode, the first pixel adjusts the degree of transmission of the first color light during a first sub-frame in which the first color light is provided, and the second pixel, the third pixel, and the fourth pixel are During a second sub-frame in which the first color light is blocked and the second color light is provided, the second pixel adjusts the degree of transmission of the second color light, and the first pixel, the third pixel, and the fourth pixel are Blocking the second color light, and during a third sub-frame in which the third color light is provided, the third pixel adjusts the degree of transmission of the third color light, and the first pixel, the second pixel, and the fourth pixel Block the third color light.

Meanwhile, the display device further includes a temperature sensor, the temperature sensor senses an external temperature, and when the temperature falls below a specific temperature according to the sensed temperature, the display device operates in a low temperature field sequential driving mode and the temperature decreases When the temperature is higher than a specific temperature, the display device operates in a mixed field sequential driving mode, and in the mixed field sequential driving mode, the first pixel and the fourth pixel receive the first color light during a first sub-frame in which the first color light is provided. Adjust the degree of transmission, the second pixel and the third pixel block the light of the first color, and during a second sub-frame in which the light of the second color is provided, the second pixel and the fourth pixel transmit the light of the second color Adjust the degree of transmission, the first pixel and the third pixel block the light of the second color, and during a third sub-frame in which the light of the third color is provided, the third pixel and the fourth pixel transmit the light of the third color Adjust the degree of transmission and the first pixel and the second pixel block the third color light, and in the low temperature field sequential driving mode, the first pixel during the first sub-frame in which the first color light is provided Adjust the degree of light transmission, the second pixel, the third pixel, and the fourth pixel block the light of the first color, and during a second sub-frame in which the light of the second color is provided, the second pixel is of the second color Adjust the degree of light transmission, the first pixel, the third pixel, and the fourth pixel block the light of the second color, and during a third sub-frame in which the light of the third color is provided, the third pixel is of the third color The light transmittance is adjusted, and the first pixel, the second pixel, and the fourth pixel block the light of the third color.

Meanwhile, the display device further includes an optical sensor, the optical sensor senses an external luminous intensity, and according to the sensed luminous intensity, at night time, the display device operates in a low-temperature field sequential driving mode, and during the daytime, the display device operates Operates in a mixed field sequential driving mode, and in the mixed field sequential driving mode, the first pixel and the fourth pixel adjust the degree of transmission of the first color light during a first sub-frame in which the first color light is provided, and The second pixel and the third pixel block the light of the first color, and during the second sub-frame in which the light of the second color is provided, the second pixel and the fourth pixel adjust the degree of transmission of the light of the second color and The first pixel and the third pixel block the light of the second color, and during the third sub-frame in which the light of the third color is provided, the third pixel and the fourth pixel adjust the degree of transmission of the light of the third color and The first pixel and the second pixel block the light of the third color, and in the low-temperature field sequential driving mode, the first pixel and the degree of transmission of the light of the first color are adjusted during the first sub-frame in which the light of the first color is provided and a second pixel, a third pixel, and a fourth pixel block the light of the first color, and during a second sub-frame in which the light of the second color is provided, the second pixel adjusts the degree of transmission of the light of the second color and the first pixel, the third pixel, and the fourth pixel block the light of the second color, and during a third sub-frame in which the light of the third color is provided, the third pixel adjusts the degree of transmission of the light of the third color and the first pixel, the second pixel, and the fourth pixel block the light of the third color.

Meanwhile, the plurality of pixels further include a fifth pixel and a sixth pixel overlapping the fourth filter area.

Meanwhile, data voltages to which different gamma voltage curves are applied are applied to the fourth, fifth, and sixth pixels.

Meanwhile, for one gray level between the minimum gray level and the maximum gray level, data voltages applied to the fourth pixel, the fifth pixel, and the sixth pixel are different.

Meanwhile, the first pixel, the second pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel are arranged in a matrix shape, and the first pixel and the fourth pixel are repeatedly alternately arranged in the column direction in a first column , a second column in which fifth pixels and second pixels are repeatedly alternately arranged in a column direction, and a third column in which third pixels and sixth pixels are repeatedly alternately arranged in a third direction, and a first pixel in a row direction; A fifth pixel, a third pixel, a fourth pixel, a second pixel, and a sixth pixel are repeatedly arranged.

According to another aspect of the present invention, there is provided a display device comprising: a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines; a light source providing light to the display substrate, wherein a first filter area transmits the first color light, a second filter area transmits the second color light, and a third filter transmits the third color light a color filter including a region and a fourth filter region transmitting the first color light, the second color light, and the third color light, wherein the plurality of pixels overlap at least the first filter region of the color filter a first pixel, a second pixel overlapping a second filter area of the color filter, a third pixel overlapping a third filter area of the color filter, and a fourth pixel overlapping a fourth filter area of the color filter; It includes a fifth pixel and a sixth pixel, and a data voltage to which different gamma voltage curves are applied is applied to the fourth pixel, the fifth pixel, and the sixth pixel.

According to another embodiment of the present invention, there is provided a display device comprising: a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines; a light source providing light to the display substrate, wherein a first filter area transmits the first color light, a second filter area transmits the second color light, and a third filter transmits the third color light a color filter including a region and a fourth filter region transmitting the first color light, the second color light, and the third color light, wherein the plurality of pixels overlap at least the first filter region of the color filter a first pixel, a second pixel overlapping a second filter area of the color filter, a third pixel overlapping a third filter area of the color filter, and a fourth pixel overlapping a fourth filter area of the color filter; 5 pixels and a sixth pixel, wherein the first pixel, the second pixel, the third pixel, the fourth pixel, the fifth pixel and the sixth pixel are arranged in a matrix shape, and the first pixel and the fourth pixel in the column direction a first column repeatedly alternately arranged in a first column, a second column in which fifth and second pixels are repeatedly alternately arranged in a column direction, and a third column in which third pixels and sixth pixels are repeatedly alternately arranged in a third direction; , the first pixel, the fifth pixel, the third pixel, the fourth pixel, the second pixel, and the sixth pixel are repeatedly arranged in the row direction.

According to the embodiments of the present invention, there are at least the following effects.

That is, while improving the transmittance of the display device, it is possible to prevent display quality deterioration due to the low-speed response characteristic of the liquid crystal at a low temperature.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is an exploded perspective view schematically illustrating a display device according to an exemplary embodiment.
2 is an exemplary diagram illustrating a full-color image recognized by a viewer when a display device according to an exemplary embodiment displays a red image, a green image, and a blue image.
3 is a perspective view illustrating an arrangement relationship of a color filter of a display device, sub-pixels of a display substrate, and blocks of a backlight unit according to an exemplary embodiment of the present invention.
4 is a cross-sectional view illustrating a pixel structure of a display device according to an exemplary embodiment of the present invention.
5 is an exemplary perspective view of a backlight unit according to an embodiment of the present invention.
6 is a timing diagram illustrating a scan signal of a display device and a driving timing of a backlight unit according to an exemplary embodiment.
7 is an exemplary diagram illustrating that one “main pixel” represents a “red dot”.
8 is an exemplary diagram illustrating that one “main pixel” represents a “cyan dot”.
9 is an enlarged view of a display device displaying a specific image and a partial region of the specific image.
10 is a graph illustrating changes according to temperature of liquid crystal characteristic coefficients that determine the response speed of liquid crystal.
11 is a graph illustrating driving of a white pixel at room temperature and driving at a low temperature when the white pixel transmits only red light.
12 is an exemplary diagram illustrating that one “main pixel” represents a “red dot” in the low-temperature field sequential driving mode.
13 is an exemplary diagram illustrating that one “main pixel” represents a “cyan dot” in a low-temperature field sequential driving mode.
14 is an exemplary diagram illustrating that one “main pixel” represents a “white point” in the low-temperature field sequential driving mode.
15 is a perspective view illustrating an arrangement relationship between a color filter of a display device, sub-pixels of a display substrate, and blocks of a backlight unit according to another exemplary embodiment of the present invention.
16 is a cross-sectional view illustrating a pixel structure of a display device according to another embodiment of the present invention.
17 is an exemplary diagram illustrating that one “main pixel” represents a “red dot”.
18 is an exemplary diagram illustrating that one “main pixel” represents a “drawn dot”.
19 is an exemplary diagram illustrating that one “main pixel” represents a “blue dot”.
20 is an exemplary diagram illustrating that one “main pixel” represents a “white point”.
21 is an exemplary diagram illustrating that one “main pixel” represents a “cyan point”.
22 is an exemplary view in which a display device displays a specific image and an enlarged view of a partial region of the specific image according to another embodiment of the present invention.
23 is an exemplary diagram illustrating that one “main pixel” represents a “red dot” in the low-temperature field sequential driving mode.
24 is an exemplary diagram illustrating that one “main pixel” represents a “cyan dot” in the low-temperature field sequential driving mode.
25 is an exemplary diagram illustrating that one “main pixel” represents a “white point” in the low-temperature field sequential driving mode.
26 is a graph illustrating gamma curves applied to each white sub-pixel and gamma curves for luminance of all sub-pixels in a display device according to another embodiment of the present invention.
27 is an exemplary diagram illustrating tilting angles of liquid crystals corresponding to first to third white sub-pixels with respect to a specific grayscale level.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

In this specification, the same reference numerals refer to substantially the same components.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

In this specification, when it is mentioned that a certain element is "connected" to another element, it may be directly connected to the other element, but it should also be understood as being connected via another element in the middle. will be. Other expressions describing the relationship between elements, such as "between" or "immediately between" or "neighboring to" and "directly adjacent to", should be interpreted likewise. will be.

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

1 is an exploded perspective view schematically illustrating a display device according to an exemplary embodiment.

Referring to FIG. 1 , a display device according to an exemplary embodiment includes a display substrate 100 , a liquid crystal layer 200 , a counter substrate 300 , a backlight unit 400 , a color filter CF, and a second A first polarizing plate POL1 and a second polarizing plate POL2 are included.

The liquid crystal layer 200 may be interposed between the display substrate 100 and the opposite substrate 300 . The alignment direction and degree of alignment of the liquid crystals in the liquid crystal layer 200 may vary according to the direction and strength of the electric field formed in the liquid crystal layer 200 . In the embodiment shown in FIG. 1 , the liquid crystal of the liquid crystal layer 200 is oriented in the vertical alignment mode (VA). In the vertical alignment mode (VA) and improved PVA (Patterned Vertical Align) mode and SPVA (Super Patterned Vertical Align) mode, the display substrate 100 is disposed on a plurality of pixels defined by a plurality of scan lines and a plurality of data lines. A plurality of formed pixel electrodes may be included, and the opposite substrate 300 may include a common electrode. An angle at which liquid crystals vertically aligned in the liquid crystal layer 200 lie in a vertical direction may be changed by a voltage difference between the plurality of pixel electrodes and the common electrode of the plurality of pixels. Each of the liquid crystals of the liquid crystal layer 200 may have a birefringence characteristic with different refractive indices in the long-axis direction and the short-axis direction of the liquid crystal, and the optical axis of the light passing through the liquid crystal layer 200 depends on the degree to which the liquid crystals lie with respect to the vertical alignment. You can adjust the amount of twist.

The light provided from the backlight unit 400 to the liquid crystal layer 200 may be light polarized in the first direction (x direction) through the first polarizing plate POL1, and the liquid crystal layer 200 may be polarized in the first direction ( The polarization direction of light polarized in the x direction) may be twisted, and the light whose polarization direction is twisted through the liquid crystal layer 200 may be polarized in the first direction (x direction) to the second direction (y direction). have. The second polarizing plate POL2 disposed on the opposing substrate 300 may have a transmission axis aligned in the second direction (y-direction), and among the light passing through the liquid crystal layer 200 , the light of the polarization component in the second direction It may transmit and block the light of the polarization component in the first direction (x direction).

Also, a color filter CF may be disposed on the opposite substrate 300 . The color filter (CF) has a red filter area that passes red light and absorbs light of another color, a green filter area that passes green light and absorbs light of another color, and a green filter area that passes light of a blue color and absorbs light of another color. It may include a blue filter region that absorbs colored light.

In one embodiment of the present invention, the color filter CF may further include a white filter region that transmits all of red, green, and blue light, and the white filter region is at least a portion of the color filter CF. The white dye may be injected into the region, no dye may be injected into at least a partial region of the transparent color filter CF, or may be formed by removing at least a partial region of the color filter CF.

In the display device according to an embodiment of the present invention, the display substrate 100 , the liquid crystal layer 200 , and the opposite substrate 300 have been exemplified to operate in a vertical alignment mode, but the present invention is not limited thereto. In some embodiments, the driving mode of the display panel including the display substrate 100 , the liquid crystal layer 200 and the counter substrate 300 may include other driving modes, for example, Multi-Domain Vertical Alignment (MVA), Modes such as an In-Plane Switching (IPS) mode and a Plane to Line Switching (PLS) mode may be used.

Also, in FIG. 1 , a display device according to an exemplary embodiment includes a backlight unit 400 , a first polarizing plate POL1 , a display substrate 100 , a liquid crystal layer 200 , a counter substrate 300 , and a color Although the structure in which the filter CF and the second polarizing plate POL2 are stacked in this order is exemplified, the present invention is not limited thereto. In the present invention, the positional relationship of each component may be changed within a range to which the optical function of the component is applied, for example, the color filter CF is disposed under the opposite substrate 300 or displayed It may be disposed above and below the substrate 100 , or may be embedded in each pixel of the display substrate 100 . In addition, each of the components illustrated in FIG. 1 may be integrated within a range to which the optical function of each component is applied, for example, the second polarizing plate (POL2), the color filter (CF), and the counter substrate ( 300 may be integrally formed, and the first polarizing plate POL1 may be integrated into the backlight unit 400 as one optical film of the backlight unit 400 .

In an embodiment of the present invention, the backlight unit 400 may be a surface light source that sequentially provides red light R, green light G, and blue light B to the display substrate 100 . The display substrate 100 may control the degree to which the polarization axes of each of the sequentially provided red light R, green light G, and blue light B are twisted for each pixel of the display substrate 100 , and the second The amount of light of each red color, green color, and blue color passing through the polarizing plate POL2 may be adjusted. Accordingly, the display device according to an embodiment of the present invention may sequentially display a red image (R_IMAGE), a green image (G_IMAGE), and a blue image (B_IMAGE) corresponding to the red, green, and blue light sources, respectively. , the viewer may recognize an image in which red, green, and blue colors are mixed, that is, an image in which red, green, and blue colors are temporally dithered as a full-color image.

2 is an exemplary diagram illustrating a full-color image recognized by a viewer when the display device displays a red image, a green image, and a blue image according to an embodiment of the present invention.

Referring to FIG. 2 , one frame of the display device according to an embodiment of the present invention includes a red sub-frame displaying a red image (R_IMAGE), a green sub-frame displaying a green image (G_IMAGE), and a blue image (B_IMAGE). may include a blue sub-frame indicating

In the red sub frame, a plurality of pixels of the display substrate 100 load red data R_Data corresponding to the red image R_IMAGE, and the liquid crystal of the liquid crystal layer 200 corresponds to the loaded red data R_Data. This can be arranged. Then, the backlight unit 400 may provide the red light R to the display substrate 100 , and a red image R_IMAGE corresponding to the arranged liquid crystals may be displayed.

Next, in the green sub frame, a plurality of pixels of the display substrate 100 load green data G_Data corresponding to the green image G_IMAGE, and the liquid crystal layer 200 corresponds to the loaded green data G_Data. of liquid crystals may be arranged. Then, the backlight unit 400 may provide green light G to the display substrate 100 , and a green image G_IMAGE corresponding to the arranged liquid crystals may be displayed.

Subsequently, in the blue sub frame, a plurality of pixels of the display substrate 100 load blue data B_Data corresponding to the blue image B_IMAGE, and the liquid crystal layer 200 corresponds to the loaded blue data B_Data. of liquid crystals may be arranged. Then, the backlight unit 400 may provide blue light B to the display substrate 100 , and a blue image B_IMAGE corresponding to the arranged liquid crystals may be displayed.

A viewer can visually recognize an image in which a red image (R_IMAGE), a green image (G_IMAGE), and a blue image (B_IMAGE) are sequentially displayed as a full color image (FC_IMAGE), for example, red and black An image in which colors are temporally mixed or dithered may be recognized as a red color, an image in which black and green colors are temporally mixed or dithered may be recognized as a green (G) color, and red, green, and blue colors may be temporally recognized as a green color. It is possible to recognize an image mixed or dithered as a white (W) color, an image in which red and blue colors are temporally mixed or dithered can be recognized as a magenta (M) color, and green and blue colors are temporally mixed. Alternatively, the dithered image may be recognized as a cyan (C) color.

3 is a perspective view illustrating an arrangement relationship of a color filter of a display device, sub-pixels of a display substrate, and blocks of a backlight unit according to an exemplary embodiment of the present invention.

Referring to FIG. 3 , a backlight unit 400 of a display device according to an exemplary embodiment includes a plurality of blocks BL11 to BL68 arranged in a matrix shape, and each block BL11 to BL68 It may be a direct light source capable of controlling the intensity of the emitted light. However, this is only an exemplary embodiment of the present invention, and in the present invention, the backlight unit 400 sequentially transmits red light (R), green light (G), and blue light (B) to the display substrate 100 . It can be a variety of light sources that achieve the optical function they provide.

For example, in another embodiment of the present invention, the backlight unit may be an edge-type surface light source including one or more red light sources, one or more green light sources, and one or more blue light sources disposed on at least one side of the backlight unit.

Further, in another embodiment of the present invention, the backlight unit is not a surface light source directed toward the display substrate, but one or more red light sources, one or more green light sources, and one or more The illumination may include a blue light source, and in this case, light reflected by a space on the opposite surface of the display substrate or an object therein may be provided toward the display substrate.

A plurality of pixels PX may be disposed to overlap one block BL34 of the backlight unit 400, and each pixel includes a red filter area, a green filter area, a blue filter area, and a color filter area of the color filter CF. One of the white filter areas may overlap.

The color filter CF may include a red filter area, a green filter area, a blue filter area, and a white filter area around one corner. In the present specification, a red filter area, a green filter area, and a blue filter area A plurality of pixels overlapping the region and the white filter region are respectively referred to as a red sub-pixel (R_SPX), a green sub-pixel (G_SPX), a blue sub-pixel (B_SPX), and a white sub-pixel (W_SPX).

The backlight unit 400 may include a plurality of red LEDs, green LEDs, and blue LEDs, and sequentially turn on and off the plurality of red LEDs, green LEDs, and blue LEDs to provide red light ( R), green light (G), and blue light (B) may be sequentially provided.

The magnitude of the current or voltage provided to each block of the backlight unit 400 may be adjusted differently for each block, and the magnitude of the voltage or current provided to one block may be adjusted according to the image image corresponding to each block. can be

For example, when the display device of the present invention is used as an outdoor billboard, an advertisement text or image is displayed in the central portion of the display device, and a white background image is displayed in the outer portion of the display device, the backlight unit 400 A voltage or current corresponding to the maximum brightness or gradation may be provided to the outer blocks, and a voltage or current corresponding to a relatively small brightness or gradation may be provided to the blocks in the center of the backlight unit 400 . .

4 is a cross-sectional view illustrating a pixel structure of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 4 , the display substrate 100 of the display device according to the exemplary embodiment includes a plurality of scan lines SL1 to SLn and a plurality of data lines DL1 to DLm, and includes a plurality of scan lines. may include a red sub-pixel (R_SPX), a green sub-pixel (G_SPX), a blue sub-pixel (B_SPX), and a white sub-pixel (W_SPX) respectively connected to (SL1 to SLn) and the plurality of data lines (DL1 to DLm). have. The red sub-pixel (R_SPX), the green sub-pixel (G_SPX), the blue sub-pixel (B_SPX), and the white sub-pixel (W_SPX) may be disposed adjacent to each other around one corner, and the red sub-pixel (R_SPX) and the green sub-pixel (R_SPX) The sub-pixels G_SPX may be alternately and repeatedly arranged in one direction in one row, and the blue sub-pixels B_SPX and the white sub-pixels W_SPX may be alternately arranged in one direction in another adjacent row. .

In this specification, a "main pixel" corresponds to a unit of one "point" in raw image data in which a plurality of "dots" are gathered to constitute one image, and a "sub-pixel" is used to represent one "main pixel". Corresponding to one of the plurality of dots on the display substrate 100 for do. In addition, a “pixel” corresponds to a pixel structure of a minimum unit expressed by a display device, like a “sub-pixel”, and when one “pixel” corresponds to a specific color, “red sub-pixel (R_SPX)”, “green sub-pixel” Pixel (G_SPX)", "blue sub-pixel (B_SPX)" or "white sub-pixel (W_SPX)" is used separately. However, since “pixel” and “sub-pixel” refer to components of the same unit, they are used interchangeably herein.

That is, a set of red sub-pixels (R_SPX), green sub-pixels (G_SPX), blue sub-pixels (B_SPX), and white sub-pixels (W_SPX) adjacent to one corner may be referred to as one main pixel (MPX). , which may correspond to one point expressed in full color among the images of the raw image data. In addition, the red sub-pixel R_SPX may be an area overlapping the red filter area of the color filter CF among the plurality of pixels of the display substrate 100 , and the green sub-pixel G_SPX and the blue sub-pixel B_SPX , the white sub-pixel W_SPX may be an area overlapping the green filter area, the blue filter area, and the white filter area of the color filter CF, respectively.

The red sub-pixel (R_SPX), the green sub-pixel (G_SPX), the blue sub-pixel (B_SPX), and the white sub-pixel (W_SPX) in one main pixel have different data lines DL _j , DL _{j +1} , DL _{j + 2} , DL _{j +3} ) and the red sub-pixel (R_SPX), green sub-pixel (G_SPX), blue sub-pixel (B_SPX) and white sub-pixel (W_SPX) within one main pixel are all connected to one scan line (SLi). ) can be connected to In response to the scan signal Si applied to one scan line SLi, the data signals D _j , D _{j +1} , D _{j +2} , and D _{j +3} are respectively applied to each of the sub-pixels. In this case, each pixel electrode (not shown) may be charged with a voltage corresponding to the applied data signals D _j , D _{j +1} , D _j+2 , and D _{j +3 .}

Next, a driving method of a display device according to an exemplary embodiment will be described in more detail with reference to FIGS. 5 and 6 .

5 is an exemplary perspective view of a backlight unit according to an embodiment of the present invention.

6 is a timing diagram illustrating a scan signal of a display device and a driving timing of a backlight unit according to an exemplary embodiment.

Referring to FIG. 5 , a backlight unit 400 of a display device according to an exemplary embodiment includes a plurality of blocks BL11 to BL68 arranged in a matrix form. The plurality of blocks BL11 to BL68 of the backlight unit 400 may be emitted or extinguished together in units of one or more rows. For example, the backlight unit 400 may include a plurality of block lines BL_L1 to BL_L6 that are distinguished in a direction in which a scan signal is sequentially applied to the scan lines of the display substrate 100 , and each block The lines BL_L1 to BL_L6 may be an aggregate of blocks in one or more rows of the plurality of blocks BL11 to BL68 arranged in a matrix form.

According to an embodiment of the present invention, each of the block lines BL_L1 to BL_L6 may be sequentially emitted and quenched in a scan direction.

6 , the plurality of blocks BL11 to BL68 of the backlight unit 400 forms an aggregate of six block lines BL_L1 to BL_L6, but the present invention is not limited thereto. . The number of aggregates of the block lines BL_L1 to BL_L6 formed by the plurality of blocks BL11 to BL68 may be variously changed as long as optical characteristics required for the display device are satisfied. For example, the number of block lines may be equal to the number of rows (6 in the case of the embodiment of FIG. 6 ) of the plurality of blocks BL11 to BL68 arranged in two or in a matrix form.

Referring to FIG. 6 , in the display device according to an embodiment of the present invention, one frame may include a red sub-frame, a green sub-frame, and a blue sub-frame. The red sub-frame, the green sub-frame, and the blue sub-frame may each correspond to a section in which the display device sequentially displays the red image R_IMAGE, the green image G_IMAGE, and the blue image B_IMAGE. In one embodiment of the present invention, it has been exemplified that the red image (R_IMAGE), the green image (G_IMAGE), and the blue image (B_IMAGE) are sequentially displayed in the order, but the present invention is not limited thereto. The display device according to the embodiments of the present invention suffices to implement a full-color image by temporally mixing or dithering a red image (R_IMAGE), a green image (G_IMAGE), and a blue image (B_IMAGE) that are sequentially displayed. The order of the red image R_IMAGE, the green image G_IMAGE, and the blue image B_IMAGE may be changed.

The red subframe may be divided into an R-data load period and a blank period. The R-data load period corresponds to a period in which a data voltage corresponding to the red image R_IMAGE is applied to the plurality of pixels of the display substrate 100 , and the blank period is the remaining period of the red subframe except for the R-data load period. As such, the backlight unit 400 may be a period in which the red light R is provided to the display substrate 100 .

During the R-data load period, turn-on scan signals S1 to Sn may be sequentially applied to the plurality of scan lines SL1 to SLn of the display substrate 100 . While the turn-on scan signal S1 to Sn is applied to each of the scan lines SL1 to SLn, the red sub-pixel R_SPX and the green sub-pixel G_SPX are connected to the scan line to which the turn-on scan signal is applied. , the blue sub-pixels B_SPX and the white sub-pixels W_SPX may receive data signals D1 to Dm from the data lines DL1 to DLm, respectively, and a voltage corresponding to the applied data signal is applied to each sub-pixel. The pixel electrode of the pixel may be charged.

A pixel electrode (not shown) forms an electric field in the liquid crystal layer 200 , and the arrangement of liquid crystals in the liquid crystal layer 200 may be changed in accordance with the formed electric field. Compared to the charging or discharging time of the pixel electrode, the arrangement time of the liquid crystals in the liquid crystal layer 200 has a relatively long delay time, so the liquid crystal arrangement time (t _lc ) required for the liquid crystals to be sufficiently arranged must be considered.

During the R-data load period, since turn-on scan signals S1 to Sn are sequentially applied to the plurality of scan lines SL1 to SLn, the first scan signal S1 is applied to the first scan line SL1 There may be a time difference between a time point at which the signal is performed and a time point at which the last scan signal Sn is applied to the last scan line SLn. Accordingly, when the data voltage is charged to the pixels connected to the first scan line to sufficiently align the liquid crystal corresponding to the charged data voltage, and the data voltage is charged to the pixels connected to the last scan line to correspond to the charged data voltage The timing of sufficiently aligning the liquid crystal may be different.

The easiest approach to display the red image (R_IMAGE) signal by sufficiently aligning the liquid crystals corresponding to all pixels to correspond to the data voltage is to apply the last scan signal Sn to the last scan line SLn, and then After the liquid crystals corresponding to the pixels connected to the line SLn are arranged, the backlight unit 400 may provide the red light R to all the pixels of the display substrate 100 at once.

In this approach, after the liquid crystal arrangement time in which the liquid crystals corresponding to the pixels connected to the last scan line are arranged, the backlight unit 400 has to provide the red light R to the display substrate 100 , so that the first scan The liquid crystal arrangement time in which liquid crystals corresponding to pixels connected to the line are arranged and the liquid crystal arrangement time in which liquid crystals corresponding to pixels connected to the last scan line are arranged may be different, and when red light (R) is provided to the liquid crystals , may cause a deviation in the arrangement of liquid crystals for the same data voltage. In order to reduce the deviation of the liquid crystal arrangement due to the difference in liquid crystal arrangement time, the liquid crystal arrangement time in which the liquid crystals corresponding to the pixels connected to the last scan line are arranged is lengthened so that the liquid crystals corresponding to the pixels connected to the first scan line are arranged It may be considered to reduce the ratio of the liquid crystal arrangement time in which liquid crystals corresponding to the pixels connected to the last scan line are arranged to the liquid crystal arrangement time to be completed. In this case, since a relatively longer time should elapse after the data voltage is applied to the pixels connected to the last scan line, the length of the blank may be increased.

However, in the present invention, since one frame is divided into three sub-frames, the period allocated to each sub-frame may be limited. For example, when the display device according to an embodiment of the present invention is driven at 60 Hz, the period of one frame may be 16.7 ms, and the period of each sub-frame may be 5.56 ms. In order to improve display quality, in the case of high-speed driving of 120 Hz or higher, the period allocated to each sub-frame may be shorter than this.

Therefore, during the red sub-frame period, the R_data load period should be shortened as the blank period is increased, which may be a constraint in charging an appropriate data voltage to the pixel electrodes of a plurality of pixels.

On the other hand, each block line of the backlight of the display device according to an exemplary embodiment sequentially emits red light R in a scan direction in which scan signals are sequentially applied to the scan lines of the display substrate 100 . and quenching, thus providing red light R to the corresponding liquid crystal after the liquid crystal is sufficiently aligned in accordance with the data voltage charged in each pixel.

Specifically, the red light in the first block line is the first block after the liquid crystal arrangement time (t _lc) which is a liquid crystal are fully arranged to be superimposed on the line, the liquid crystal to be superimposed on the first block line of the backlight unit 400 ( R), and the other block lines sequentially emit and extinguish red light R, so that the last block line of the backlight unit 400 is a liquid crystal arrangement time t in which the liquid crystals overlapping the last block line are sufficiently arranged _{After lc} ), red light R may be provided to liquid crystals overlapping the last block line.

That is, according to an embodiment of the present invention, after liquid crystals overlapping each block line are arranged for a similar liquid crystal arrangement time t _lc , by receiving red light R from each block line, the liquid crystal arrangement It is possible to prevent a liquid crystal arrangement deviation due to a difference in time (t _{lc ).}

The time for which each block line maintains light emission may be increased or decreased according to the luminance required by the display device according to an embodiment of the present invention, and the time period for which neighboring block lines maintain light emission may partially overlap. , during the overlap time t _ov , all of the neighboring block lines maintain light emission to provide appropriate luminance to the display device.

During the green sub-frame and the blue sub-frame, the plurality of blocks BL11 to BL68 of the backlight unit 400 provide the green light G and the blue light B to the display substrate 100, respectively, so that the display device is Except for displaying the green image G_IMAGE and the blue image B_IMAGE, driving methods of the red sub-frame, the green sub-frame, and the blue sub-frame may be the same, and repeated description thereof will be omitted.

Subsequently, with reference to FIGS. 7 and 8 , a “main pixel” including a white sub-pixel (W_SPX) in a red sub-pixel (R_SPX), a blue sub-pixel (B_SPX), and a green sub-pixel (G_SPX) is defined as one “dot” A hybrid field sequential driving method, which is a driving method recognized as “ or “dot”, will be described in detail.

7 is an exemplary diagram illustrating that one “main pixel” represents a “red dot”.

8 is an exemplary diagram illustrating that one “main pixel” represents a “cyan dot”.

Referring to FIG. 7 , during one frame, when one “main pixel” represents a “red dot”, during a red sub-frame, a red sub-pixel (R_SPX) and a white sub-pixel (W_SPX) are the backlight unit 400 ) may transmit the red light R provided from the sub-pixels and block the red light R from the other sub-pixels. Subsequently, during the green sub-frame and the blue sub-frame, all sub-pixels may block both the green light G and the blue light B provided from the backlight unit 400 . Accordingly, during one frame, the red sub-pixel R_SPX and the white sub-pixel W_SPX of one main pixel may transmit the red light R, and the transmitted light during each sub-frame is temporally mixed. Or dithered, the viewer may perceive one main pixel as a "red dot".

Referring to FIG. 8 , during one frame, when one “main pixel” represents a “Cyan point”, during a red sub-frame, all sub-pixels receive red light ( R) can be blocked. Subsequently, during the green sub-frame, the green sub-pixel G_SPX and the white sub-pixel W_SPX transmit the green light G provided from the backlight unit 400 and the other sub-pixels transmit the provided green light G. can be blocked. Subsequently, during the blue sub-frame, the blue sub-pixel B_SPX and the white sub-pixel W_SPX transmit the blue light B provided from the backlight unit 400 and the other sub-pixels transmit the provided blue light B. can be blocked. Accordingly, during one frame, the white sub-pixel W_SPX may transmit the green light G and the blue light B, and thus the green light G and the blue light B are temporally mixed or dithered. Cyan color can be displayed. In addition, the blue light (B) passing through the blue sub-pixel (B_SPX), the green light (G) passing through the green sub-pixel (G_SPX), and the cyan light temporally mixed through the white sub-pixel (W_SPX) are temporally and spatially is mixed or dithered, so that the viewer can recognize one main pixel as a "cyan dot".

9 is an enlarged view of a display device displaying a specific image and a partial region of the specific image.

Referring to FIG. 9 , a specific image displayed on the display device displays a red area R_A, a green area G_A, a blue area B_A, and a white area W_A, and each area is a black line B_L. It is exemplified that it is bounded by Also, in FIG. 9 , an enlarged area EA in which a part of the center of a specific image is enlarged is also shown.

In the enlarged area EA of FIG. 9 , sub-pixels that transmit red light R are represented by a capital letter “R”, sub-pixels that transmit green light G are represented by capital letters “G”, and blue light (B) The sub-pixels passing through are represented by a capital letter "B", and sub-pixels expressing white light by mixing colors are represented by a capital letter "W". In addition, sub-pixels that block all light are indicated by black shading.

Referring to the enlarged area EA of FIG. 9 , the sub-pixels of the black line B_L shield all of the red light R, the blue light B, and the blue light B, and represent the black line B_L. can In the red area R_A, the red sub-pixel R_SPX and the white sub-pixel W_SPX can selectively transmit only the red light R, and the viewer recognizes the main pixels of the red area R_A as a red dot, The red area R_A may be visually recognized as a red surface on which the red dots are distributed. The green sub-pixel G_SPX and the white sub-pixel W_SPX in the green area G_A can selectively transmit only the green light G, and the viewer recognizes the main pixels of the green area G_A as green dots, The green area G_A may be visually recognized as a green surface on which green dots are distributed. In the blue region B_A, the blue sub-pixel B_SPX and the white sub-pixel W_SPX can selectively transmit only the blue light B, and the viewer recognizes the main pixels of the blue region B_A as blue dots, The blue area B_A may be visually recognized as a blue surface in which the blue dots are distributed.

In the white area W_A, the white sub-pixel W_SPX may transmit all of the red light R, the green light G, and the blue light B, and the transmitted red light R and the green light G ), the blue light B may be temporally mixed or dithered to be recognized as white light. In addition, the red sub-pixel R_SPX, the green sub-pixel G_SPX, and the blue sub-pixel B_SPX may selectively transmit the red light R, the green light G, and the blue light B, respectively. The red light (R), green light (G), and blue light (B) are temporally and spatially mixed or dithered to be recognized as white light. The viewer may view the main pixels of the white area W_A as a white point, and may view the white area W_A as a surface on which the white points are distributed.

Next, with reference to FIGS. 10 to 14 , only the red sub-pixel (R_SPX), the green sub-pixel (G_SPX), and the blue sub-pixel (B_SPX) of the “main pixels” are driven to recognize the main pixel as a single dot or dot. A low-temperature field sequential driving method, which is a driving method, will be described in detail.

10 is a graph illustrating changes according to temperature of liquid crystal characteristic coefficients that determine the response speed of liquid crystal.

The response speed of the liquid crystal can be expressed by the following liquid crystal response time equation.

<Equation of liquid crystal response speed>

At this time, d, γ ₁ , K, V _th and V are the cell gaps of the liquid crystal layer 200 , respectively, the rotational viscosity of the liquid crystal material, the average elastic modulus of the liquid crystal material, the threshold voltage of the liquid crystal material, and the liquid crystal material applied to the Indicates voltage (electric field).

The cell gap of the liquid crystal layer 200, the threshold voltage of the liquid crystal material, and the voltage (electric field) applied to the liquid crystal material are generally temperature-independent values, and the rotational viscosity and average elastic modulus of the liquid crystal material may vary with temperature, In FIG. 10, variations according to temperature of rotational viscosity and average elastic modulus of such a liquid crystal material are exemplified.

In FIG. 10 , the first line LINE1 indicates the elastic modulus of the liquid crystal material, the third line LINE3 indicates the rotational viscosity of the liquid crystal material, and the second line LINE2 indicates the average elastic modulus of the liquid crystal material. The ratio of rotational viscosity to

Referring to FIG. 10 , the first line LINE1 indicating the average elastic modulus of the liquid crystal material and the third line LINE3 indicating the rotational viscosity of the liquid crystal material may both increase as the temperature decreases. However, the increase amount of the first line LINE1 with respect to the unit temperature decrease, that is, the increase amount of the average elastic modulus, may be smaller than the increase amount of the third line LINE3 with the unit temperature decrease, that is, the increase amount of the rotational viscosity. That is, the second line LINE2 indicating the ratio of the rotational viscosity to the elastic modulus of the liquid crystal material may increase as the temperature decreases.

Therefore, from the above "liquid crystal response time equation" and FIG. 10, it can be derived that the response time of the liquid crystal increases as the temperature decreases. For example, the response time of the liquid crystal at a temperature of 0 degrees Celsius may be approximately 3.5 times that of the liquid crystal at a temperature of 20 degrees Celsius, and based on the trend of the second line shown in FIG. It can be seen that the response time of the liquid crystal will increase significantly.

As described above, one frame of the display device according to an exemplary embodiment includes a red sub-frame, a green sub-frame, and a blue sub-frame, and a plurality of pixels may be driven in units of each sub-frame. In particular, when the display device according to the exemplary embodiment performs the above-described mixed field sequential driving, the white pixel adjusts the degree of transmission with respect to each of red light (R), green light (G), and blue light (B). Therefore, a faster liquid crystal response speed may be required than that of a general liquid crystal display device.

11 is a graph illustrating driving of a white pixel at room temperature and driving at a low temperature when the white pixel attempts to transmit only red light R. Referring to FIG.

First, a behavioral aspect LC_t1 of a liquid crystal superimposed on a white pixel at room temperature will be described with reference to FIG. 11 .

When one white pixel corresponds to an image that transmits only red light R, one white pixel may receive a data voltage that transmits red light R during the R_Data load period of the red subframe. _{After the liquid crystal arrangement time t lc} when the liquid crystal is sufficiently aligned to correspond to the applied data voltage, the red light R may be provided to the white sub-pixel W_SPX and the liquid crystal from the backlight unit 400 . The red light R may be displayed by passing through the white sub-pixel W_SPX and the liquid crystal by the arranged liquid crystal.

Thereafter, the white sub-pixel W_SPX may receive a data voltage that blocks the green light G during the G_Data load period of the green sub-frame. After the liquid crystal is sufficiently arranged to correspond to the applied data voltage, for example, the gray level voltage corresponding to the zero gray level data, the green light G is emitted from the backlight unit 400 to the white sub-pixel W_SPX and the liquid crystal. may be provided. In this case, the white sub-pixel W_SPX and the liquid crystal overlapping it may maintain a liquid crystal arrangement state that blocks the green light G, and may be blocked from being provided to the white sub-pixel W_SPX and the liquid crystal. Although not shown, the white sub-pixel W_SPX and the liquid crystal may maintain a blocking state during the blue sub-frame, and the white sub-pixel W_SPX is temporally mixed with light transmitted from the red sub-frame, the green sub-frame, and the blue sub-frame. Alternatively, the dithered red light R may be transmitted.

Next, a behavioral aspect LC_t2 of the liquid crystal superimposed on the white pixel at low temperature will be described with reference to FIG. 11 .

Since the response speed of the liquid crystal is reduced at low temperature, the phase of the liquid crystal overlapping the white sub-pixel W_SPX in the red sub-frame may be changed with a more gentle slope compared to the liquid crystal at room temperature. In particular, in the green sub-frame, the liquid crystal superimposed on the white sub-pixel W_SPX may significantly delay the liquid crystal arrangement time reaching the liquid crystal arrangement state that blocks the green light G, and the liquid crystal blocks the green light G. Before reaching the blocking liquid crystal arrangement state, the white pixel and the liquid crystal may receive the green light G from the backlight unit 400 . Accordingly, the white pixel may transmit the green light G in the green sub-frame, and the viewer receives the red light R transmitted in the red sub-frame and the green light G transmitted in the green sub-frame as one During the frame, temporally mixed colors or dithered colors can be recognized.

At a low temperature, such color mixing caused by a slow response speed of the liquid crystal may deteriorate the overall color of the display device, thereby deteriorating the display quality of the display device. In particular, when the display device is used for outdoor advertisement, the display device may be exposed to low-temperature air, and display quality deterioration due to color mixing may be severe.

Unlike the white sub-pixel W_SPX and the liquid crystals of the liquid crystal layer 200 superposed thereon, the red sub-pixel R_SPX, the green sub-pixel G_SPX, and the blue sub-pixel B_SPX are each formed by the red filter of the color filter CF. Since it overlaps the region, the green filter region, and the blue filter region, for example, even if green light (G) or blue light (B) is provided to the red sub-pixel (R_SPX), the provided green light (G) or blue light (B) ) can be blocked by the red filter region, and the red sub-pixel (R_SPX), green sub-pixel (G_SPX), and blue sub-pixel (B_SPX) have less effect of color mixing like the white sub-pixel (W_SPX) at low temperature. have.

Accordingly, the display device according to an exemplary embodiment may change the driving mode to the low temperature field sequential driving mode when the display device is driven at a low temperature, and in the low temperature field sequential driving mode, the white sub-pixel W_SPX is provided A desired image can be displayed using only the remaining red sub-pixels (R_SPX), green sub-pixels (G_SPX), and blue sub-pixels (B_SPX) while maintaining a state of blocking all light.

Alternatively, the display device according to an embodiment of the present invention may operate in the low-temperature driving mode at night time when the temperature is relatively low compared to the daytime, and the ambient light is dark and the display of high luminance is not required.

That is, the display device according to an embodiment of the present invention may include a temperature sensor or an optical sensor. When the temperature falls below a specific temperature according to the temperature sensor, the display device operates in the low temperature field sequential driving mode and the temperature is higher than or equal to the specific temperature. It may operate in the mixed-field sequential driving mode when the light is on, or it may operate in the low-temperature field sequential driving mode at night and in the mixed-field sequential driving mode during the day, depending on the optical sensor.

12 is an exemplary diagram illustrating that one “main pixel” represents a “red dot” in the low-temperature field sequential driving mode.

13 is an exemplary diagram illustrating that one “main pixel” represents a “cyan dot” in a low-temperature field sequential driving mode.

14 is an exemplary diagram illustrating that one “main pixel” represents a “white point” in the low-temperature field sequential driving mode.

Referring to FIG. 12 , when one “main pixel” expresses a “red dot” during one frame, the red sub-pixel R_SPX in the red sub-frame is the red light R provided from the backlight unit 400 . ), and other sub-pixels may block the red light (R). Subsequently, during the green sub-frame and the blue sub-frame, all sub-pixels may block both the green light G and the blue light B provided from the backlight unit 400 . Accordingly, during one frame, the red sub-pixel R_SPX may transmit the red light R in one main pixel, and the transmitted light during each sub-frame is temporally mixed or dithered, so that the viewer can view one The main pixel of can be recognized as a "red dot". In this case, the white sub-pixel W_SPX may maintain a blocking state in all sub-frames and may prevent display quality deterioration due to color mixing due to a slow liquid crystal response speed.

Referring to FIG. 13 , when one “main pixel” represents a “cyan dot” during one frame, all sub-pixels in the red sub-frame block the red light R provided from the backlight unit 400 . can do it Subsequently, during the green sub-frame, the green sub-pixel G_SPX may transmit the green light G provided from the backlight unit 400 and the remaining sub-pixels may block the provided green light G. Subsequently, during the blue sub-frame, the blue sub-pixel B_SPX may transmit the blue light B provided from the backlight unit 400 , and the remaining sub-pixels may block the provided blue light B. Accordingly, during one frame, the green light G passing through the green sub-pixel G_SPX and the blue light B passing through the blue sub-pixel B_SPX are spatially and temporally mixed or dithered during one frame. Thus, the viewer can recognize one main pixel as a "cyan dot". In this case, the white sub-pixel W_SPX may maintain a blocking state in all sub-frames and may prevent display quality deterioration due to color mixing due to a slow liquid crystal response speed.

Referring to FIG. 14 , during one frame, when one “main pixel” represents a “white point”, a red sub-pixel (R_SPX), a green sub-pixel (G_SPX), and a blue sub-pixel (B_SPX) are each red light (R), green light (G) and blue light (B) can be selectively transmitted, and the transmitted red light (R), green light (G), and blue light (B) are temporally and spatially mixed or dithered Thus, the viewer can recognize one main pixel as a "white dot".

Next, a display device according to another exemplary embodiment of the present invention will be described with reference to FIGS. 15 to 24 . The display device according to another embodiment of the present invention described below will be mainly described with respect to the differences from the one embodiment of the present invention described above, and the same identification code is used for substantially the same components, and repeated descriptions are is omitted.

15 is a perspective view illustrating an arrangement relationship between a color filter of a display device, sub-pixels of a display substrate, and blocks of a backlight unit according to another exemplary embodiment of the present invention.

Referring to FIG. 15 , the backlight unit 400 of the display device according to another embodiment of the present invention includes a plurality of blocks BL11 to BL68, and the intensity of light emitted by the plurality of blocks BL11 to BL68. It may be a direct light source that can control However, this is only an exemplary embodiment of the present invention, and in the present invention, the backlight unit 400 sequentially transmits red light (R), green light (G), and blue light (B) to the display substrate 100 . It can be a variety of light sources that achieve the optical function they provide.

A plurality of pixels PX may be disposed to overlap one block BL34 of the backlight unit 400, and each pixel includes a red filter area, a green filter area, a blue filter area, and a color filter area of the color filter CF. One of the white filter areas may overlap.

In the color filter CF, white filter areas are disposed adjacent to one filter area among the red filter area, the green filter area, and the blue filter area. Two filter areas may be disposed adjacent to each other. For example, white filter areas are disposed adjacent to the top, bottom, left, and right sides of the green filter area, red filter areas are disposed adjacent to the top left and bottom left, and blue filter areas are disposed adjacently to the top right and bottom right of the green filter area. can be Hereinafter, the arrangement relationship of the filter areas of the color filter CF will be collectively referred to as a "mosaic arrangement structure".

In the color filter CF having such a mosaic arrangement structure, when the color filter CF regions are arranged in a matrix shape, the red filter region, the green filter region, and the blue filter region are sequentially and repeatedly arranged in one diagonal direction, The white filter area may be disposed in the direction of two diagonal lines parallel to and adjacent to one diagonal line in which the red filter area, the green filter area, and the blue filter area are sequentially and repeatedly disposed.

In addition, in the color filter CF having such a mosaic arrangement structure, when the color filter CF regions are arranged in a matrix shape, red filter regions and white filter regions are repeatedly alternately arranged in the column direction. a green filter column in which filter regions and green filter regions are repeatedly alternately arranged, and a blue filter column in which blue filter regions and white filter regions are repeatedly alternately arranged; one of filter areas", "white filter area", "the other of red filter area, green filter area, and blue filter area", white filter area, "the other of red filter area, green filter area and blue filter area" and The white filter regions may be repeatedly arranged alternately.

Also, in this specification, the plurality of pixels overlapping the red filter region, the green filter region, and the blue filter region are respectively referred to as a red sub-pixel (R_SPX), a green sub-pixel (G_SPX), and a blue sub-pixel (B_SPX), and three Pixels respectively overlapping the white filter areas are referred to as a first white sub-pixel W_SPX, a second white sub-pixel W_SPX, and a third white sub-pixel W_SPX, respectively.

The backlight unit 400 may include a plurality of red LEDs, green LEDs, and blue LEDs, and sequentially turn on and off the plurality of red LEDs, green LEDs, and blue LEDs to provide red light ( R), green light (G), and blue light (B) may be sequentially provided.

The magnitude of the current or voltage provided to each block of the backlight unit 400 may be differently adjusted for each block, and the magnitude of the voltage or current provided to one block according to an image image corresponding to each block is adjusted. can be

For example, when the display device of the present invention is used as an outdoor billboard, an advertisement text or image is displayed in the central portion of the display device, and a white background image is displayed in the outer portion of the display device, the backlight unit 400 A voltage or current corresponding to the maximum brightness or gradation may be provided to the outer blocks, and a voltage or current corresponding to a relatively small brightness or gradation may be provided to the blocks in the center of the backlight unit 400 . .

16 is a cross-sectional view illustrating a pixel structure of a display device according to another embodiment of the present invention.

Referring to FIG. 16 , the display substrate 100 of the display device according to an exemplary embodiment includes a plurality of scan lines and a plurality of data lines, and is connected to the plurality of scan lines and the plurality of data lines, respectively. may include a sub-pixel (R_SPX), a green sub-pixel (G_SPX), a blue sub-pixel (B_SPX), a first white sub-pixel (W_SPX), a second white sub-pixel (W_SPX), and a third white sub-pixel (W_SPX) have. The red sub-pixel (R_SPX), the green sub-pixel (G_SPX), and the blue sub-pixel (B_SPX) are one of the first white sub-pixel (W_SPX), the second white sub-pixel (W_SPX), and the third white sub-pixel (W_SPX). They may be spaced apart from each other in the center. In addition, the red sub-pixel R_SPX, the green sub-pixel G_SPX, the blue sub-pixel B_SPX, and the first to third white sub-pixels W_SPX may be arranged in a mosaic arrangement structure.

That is, when the red sub-pixels R_SPX, the green sub-pixels G_SPX, the blue sub-pixels B_SPX, and the first to third white sub-pixels W_SPX are arranged in a matrix shape, the red sub-pixels R_SPX are arranged in the column direction. ) and a red sub-pixel (R_SPX) column in which the first white sub-pixels (W_SPX) are repeatedly alternately arranged, and a green sub-pixel (G_SPX) column in which the second white sub-pixels (W_SPX) and green sub-pixels (G_SPX) are repeatedly alternately arranged. and a column of blue sub-pixels (B_SPX) in which the blue sub-pixels (B_SPX) and the third white sub-pixels (W_SPX) are repeatedly alternately arranged, wherein in the row direction, “red sub-pixels (R_SPX)” and “second “White sub-pixel (W_SPX)”, “blue sub-pixel (B_SPX)”, “first white sub-pixel (W_SPX)” and “green sub-pixel (G_SPX)”, “third white sub-pixel (W_SPX)” and “red Sub-pixels (R_SPX)" may be alternately arranged in the order.

In this specification, a "main pixel" corresponds to a unit of one "point" in raw image data in which a plurality of "dots" are gathered to constitute one image, and a "sub-pixel" is used to represent one "main pixel". Corresponding to one of the plurality of dots on the display substrate 100 for do. In addition, a “pixel” corresponds to a pixel structure of a minimum unit expressed by a display device, like a “sub-pixel”, and when one “pixel” corresponds to a specific color, “red sub-pixel (R_SPX)”, “green sub-pixel” Pixel (G_SPX)", "blue sub-pixel (B_SPX)" or "white sub-pixel (W_SPX)" is used separately. However, since “pixel” and “sub-pixel” refer to components of the same unit, they are used interchangeably herein.

That is, a set of red sub-pixels (R_SPX), green sub-pixels (G_SPX), blue sub-pixels (B_SPX), and first to third white sub-pixels (W_SPX) constituting the mosaic arrangement structure is one main pixel (MPX). may be referred to, and this may correspond to one point expressed in full color among the images of the raw image data. In addition, the red sub-pixel R_SPX may be an area overlapping the red filter area of the color filter CF among the plurality of pixels of the display substrate 100 , and the green sub-pixel G_SPX and the blue sub-pixel B_SPX , , and the first to third white sub-pixels W_SPX may be regions overlapping the green filter region, the blue filter region, and the white filter region of the color filter CF, respectively.

The red sub-pixel R_SPX, the green sub-pixel G_SPX, the blue sub-pixel B_SPX, and the first to third white sub-pixels W_SPX in one main pixel have different data lines DL _j , DL _{j + 1} , DL _{j +2} , DL _{j +3 ,} DL _{j +4 ,} DL _{j +5} ) connected to the red sub-pixel (R_SPX), green sub-pixel (G_SPX), blue sub-pixel (B_SPX) within one main pixel. and all of the first to third white sub-pixels W_SPX may be connected to one scan line SLi. In response to the scan signal Si applied to one scan line SLi, data signals D _j , D _{j +1} , D _{j +2} , D _{j +3 ,} D _{j + 4,} D _{j +5} ) may be applied, respectively, and correspond to the applied data signals D _j , D _{j +1} , D _{j +2} , D _{j +3 ,} D _{j +4 ,} D _{j +5} ). Each pixel electrode may be charged with a voltage of

Then, referring to FIGS. 17 and 21 , a red sub-pixel (R_SPX), a blue sub-pixel (B_SPX), a green sub-pixel (G_SPX), and first to third white sub-pixels (W_SPX) forming a mosaic arrangement structure are included. A hybrid field sequential driving method, which is a driving method for recognizing a “main pixel” as a single “dot” or “dot”, will be described in detail.

17 is an exemplary diagram illustrating that one “main pixel” represents a “red dot”.

18 is an exemplary diagram illustrating that one “main pixel” represents a “drawn dot”.

19 is an exemplary diagram illustrating that one “main pixel” represents a “blue dot”.

20 is an exemplary diagram illustrating that one “main pixel” represents a “white point”.

21 is an exemplary diagram illustrating that one “main pixel” represents a “cyan point”.

Referring to FIG. 17 , when one “main pixel” represents a “red dot” during one frame, during a red sub-frame, a red sub-pixel (R_SPX) and first to third white sub-pixels (W ₁ _SPX) , W ₂ _SPX, W ₃ _SPX transmits the red light R provided from the backlight unit 400 , and the green sub-pixels G_SPX and the blue sub-pixels B_SPX block the red light R. can Subsequently, during the green sub-frame and the blue sub-frame, all sub-pixels may block both the green light G and the blue light B provided from the backlight unit 400 . Accordingly, during one frame, one main pixel is configured such that the red sub-pixel R_SPX and the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX transmit the red light R. and the light transmitted during each sub-frame is temporally mixed or dithered, so that the viewer may recognize one main pixel as a "red dot".

Then, referring to FIG. 18 , during one frame, when one “main pixel” represents a “drawn dot”, all sub-pixels during the red sub-frame and the blue sub-frame are red provided from the backlight unit 400 . Light (R) and blue light (B) can be blocked. Meanwhile, during the green sub-frame, the green sub-pixel G_SPX and the first to third white sub-pixels may transmit the green light G provided from the backlight unit 400 . Accordingly, during one frame, one main pixel transmits the green light G by the green sub-pixel G_SPX and the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W _{3 _SPX.} In this case, the light transmitted during each sub-frame is temporally mixed or dithered, so that the viewer may recognize one main pixel as a “drawn dot”.

Then, referring to FIG. 19 , during one frame, when one “main pixel” expresses a “blue dot”, all sub-pixels during a red sub-frame and a green sub-frame are red provided from the backlight unit 400 . Light (R) and blue light (B) can be blocked. Meanwhile, during the blue sub-frame, the blue sub-pixel B_SPX and the first to third white sub-pixels may transmit the blue light B provided from the backlight unit 400 . Accordingly, during one frame, one main pixel is a blue sub-pixel (B_SPX) and the first to third white sub-pixels (W ₁ _SPX, W ₂ _SPX, W ₃ _SPX) to transmit the blue light (B). and the light transmitted during each sub-frame is temporally mixed or dithered, so that the viewer may recognize one main pixel as a "blue dot".

That is, in the display device according to another embodiment of the present invention, when six sub-pixels constitute one main pixel, and when one of red, green, and blue images is expressed, four sub-pixels among the six sub-pixels are red, One of green and blue light (B) may be transmitted. That is, 2/3 of the sub-pixels in one main pixel may transmit light, which increases the transmittance of the pixel, thereby achieving high energy efficiency of the display device. In particular, in one main pixel, three white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX overlap the white color filter CF area, and the white color filter CF area is formed as described above. , may correspond to an area substantially free of the color filter CF, so that in the display device according to another exemplary embodiment, light loss due to the color filter CF may be reduced.

Then, referring to FIG. 20 , during one frame, when one “main pixel” represents a “white point”, during a red sub-frame, the red sub-pixel R_SPX and the first to third sub-pixels are backlighted. The red light R provided from the unit 400 is transmitted, and during the green sub-frame, the green sub-pixel G_SPX and the first to third sub-pixels transmit the green light G provided from the back light unit 400 . The blue sub-pixel B_SPX and the first to third sub-pixels may transmit the blue light B provided from the backlight unit 400 during the blue sub-frame. Accordingly, during one frame, the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX transmit the red light R, the green light G, and the blue light B. and each light may represent temporally mixed or dithered white light. In addition, the red sub-pixel R_SPX, the green sub-pixel G_SPX, and the blue sub-pixel B_SPX may transmit the red light R, the green light G, and the blue light B, respectively, and each light They are spatially and temporally mixed and dithered to express white light. In this case, the viewer may recognize one main pixel as a "white dot".

Subsequently, referring to FIG. 21 , when one “main pixel” represents a “cyan point” during one frame, all sub-pixels may block the red light R during the red sub-frame. Thereafter, during the green sub-frame, the green sub-pixel G_SPX and the first to third sub-pixels transmit the green light G provided from the backlight unit 400 , and during the blue sub-frame, the blue sub-pixel B_SPX and The first to third sub-pixels may transmit blue light B provided from the backlight unit 400 . Accordingly, during one frame, the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may transmit the green light G and the blue light B, and each light They can express temporally mixed colors or dithered cyan. In addition, the green sub-pixels G_SPX and the blue sub-pixels B_SPX may transmit the green light G and the blue light B, respectively, and the respective lights are spatially and temporally mixed and dithered to express a cyan color. can In this case, the viewer may recognize one main pixel as a "cyan point".

22 is an exemplary view in which a display device displays a specific image and an enlarged view of a partial region of the specific image according to another embodiment of the present invention.

Referring to FIG. 22 , a specific image displayed on a display device according to another exemplary embodiment includes a red area R_A, a green area G_A, a blue area B_A, and a white area W_A, respectively. It is exemplified that the regions of are bounded by a black line B_L. Also, in FIG. 21 , an enlarged area EA in which a part of the center of a specific image is enlarged is also shown.

In the enlarged area EA of FIG. 22 , sub-pixels transmitting the red light R are represented by a capital letter “R”, sub-pixels transmitting the green light G are represented by a capital letter “G”, and the blue light (B) The sub-pixels passing through are represented by a capital letter "B", and sub-pixels expressing white light by mixing colors are represented by a capital letter "W". In addition, sub-pixels that block all light are indicated by black shading.

Referring to the enlarged area EA of FIG. 22 , the sub-pixels of the black line B_L shield all of the red light R, the blue light B, and the blue light B, and represent the black line B_L. can In the red region R_A, the red sub-pixel R_SPX and the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may selectively transmit only the red light R, and the viewer Main pixels of the red area R_A may be viewed as a red dot, and the red area R_A may be viewed as a red surface in which the red dot is distributed. In the green area G_A, the green sub-pixel G_SPX and the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may selectively transmit only the green light G, and the viewer Main pixels of the green area G_A may be viewed as green dots, and the green area G_A may be viewed as a green surface on which the green dots are distributed. In the blue region B_A, the blue sub-pixel B_SPX and the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may selectively transmit only the blue light B, and the viewer Main pixels of the blue area B_A may be viewed as a blue dot, and the blue area B_A may be viewed as a blue surface in which the blue dot is distributed.

In the white area W_A, the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX transmit the red light R, the green light G, and the blue light B. The transmitted red light (R), green light (G), and blue light (B) may be temporally mixed or dithered to be recognized as white light. In addition, the red sub-pixel R_SPX, the green sub-pixel G_SPX, and the blue sub-pixel B_SPX may selectively transmit the red light R, the green light G, and the blue light B, respectively. The red light (R), green light (G), and blue light (B) are temporally and spatially mixed or dithered to be recognized as white light. The viewer may view the main pixels of the white area W_A as a white point, and may view the white area W_A as a surface on which the white points are distributed.

23 is an exemplary diagram illustrating that one “main pixel” represents a “red dot” in the low-temperature field sequential driving mode.

24 is an exemplary diagram illustrating that one “main pixel” represents a “cyan dot” in the low-temperature field sequential driving mode.

25 is an exemplary diagram illustrating that one “main pixel” represents a “white point” in the low-temperature field sequential driving mode.

Referring to FIG. 23 , when one “main pixel” expresses a “red dot” during one frame, the red sub-pixel R_SPX in the red sub-frame is the red light R provided from the backlight unit 400 . ), and other sub-pixels may block the red light (R). Subsequently, during the green sub-frame and the blue sub-frame, all sub-pixels may block both the green light G and the blue light B provided from the backlight unit 400 . Accordingly, during one frame, the red sub-pixel (R_SPX) may transmit the red light (R) in one main pixel, and the transmitted light during each sub-frame is temporally mixed or dithered, so that the viewer can view one The main pixel of can be recognized as a "red dot". In this case, the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX can maintain a blocking state in all sub-frames, and display quality degradation due to color mixing caused by slow liquid crystal response speed is prevented. can do.

Referring to FIG. 24 , when one “main pixel” represents a “cyan dot” during one frame, all sub-pixels in the red sub-frame block the red light R provided from the backlight unit 400 . can do it Subsequently, during the green sub-frame, the green sub-pixel G_SPX may transmit the green light G provided from the backlight unit 400 and the remaining sub-pixels may block the provided green light G. Subsequently, during the blue sub-frame, the blue sub-pixel B_SPX may transmit the blue light B provided from the backlight unit 400 , and the remaining sub-pixels may block the provided blue light B. Accordingly, during one frame, the green light G passing through the green sub-pixel G_SPX and the blue light B passing through the blue sub-pixel B_SPX are spatially and temporally mixed or dithered during one frame. Thus, the viewer can recognize one main pixel as a "cyan dot". In this case, the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX can maintain a blocking state in all sub-frames, and display quality degradation due to color mixing caused by slow liquid crystal response speed is prevented. can do.

Referring to FIG. 25 , during one frame, when one “main pixel” expresses a “white point”, a red sub-pixel (R_SPX), a green sub-pixel (G_SPX), and a blue sub-pixel (B_SPX) are each red light (R), green light (G) and blue light (B) can be selectively transmitted, and the transmitted red light (R), green light (G), and blue light (B) are temporally and spatially mixed or dithered Thus, the viewer can recognize one main pixel as a "white dot". In this case, the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may maintain a blocking state in the mode sub-frame, and may prevent color mixing due to a slow liquid crystal response speed.

In the display device according to another embodiment of the present invention, the first white sub-pixel W ₁ _SPX, the second white sub-pixel W ₂ _SPX, and the third white sub-pixel W ₃ _SPX have substantially the same data voltage. may be applied to transmit light of the same color and luminance.

Also, in the display device according to another embodiment of the present invention _{, the first white sub-pixel W 1} _SPX, the second white sub-pixel W ₂ _SPX, and the third white sub-pixel W ₃ _SPX are each Different data voltages may be applied to transmit light of different colors and luminance.

That is, in another embodiment of the present invention, each of the white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX receives data voltages corresponding to different grayscale data values and corresponds to the applied data voltages. It can express light and color of luminance.

However, in this case, data processing is required for all six sub-pixels constituting one main pixel, which may increase the processing load of the driving IC of the display device.

Accordingly, in another embodiment of the present invention, the _{same grayscale data value is applied to the first to third white sub-pixels W 1} _SPX, W ₂ _SPX, and W ₃ _SPX, but each of the white sub-pixels W ₁ _SPX, Data voltages applied to W ₂ _SPX and W ₃ _SPX) may be different from each other by applying different gamma curves to one grayscale data value.

26 is a graph illustrating gamma curves applied to each white sub-pixel and gamma curves for luminance of all sub-pixels in a display device according to another embodiment of the present invention.

27 is an exemplary diagram illustrating tilting angles of liquid crystals corresponding to first to third white sub-pixels with respect to a specific grayscale level.

Referring to FIG. 26 , gamma curves applied to the first to third white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may be different. 26 is a graph illustrating the normalization of luminances corresponding to other gradations when the luminance when the display device expresses the gradation of the maximum brightness is 1;

For example, when the maximum grayscale, that is, when the grayscale data value is 255, a data voltage corresponding to the 255 grayscale is applied to _{each of the white sub-pixels W 1} _SPX, W ₂ _SPX, and W _{3 _SPX.} The voltages applied to each of the white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may be the same, and the amount of light transmitted through each of the white sub-pixels W ₁ _SPX, W ₂ _SPX, and W _{3 _SPX} Each luminance may correspond to 0.25. Sub-pixels other than the white sub-pixels (W ₁ _SPX, W ₂ _SPX, W ₃ _SPX), that is, one or more of the red sub-pixel (R_SPX), the green sub-pixel (G_SPX), and the blue sub-pixel (B_SPX) The luminance of light may correspond to 0.25, and the luminance of light passing through one main pixel at the maximum gray level may be normalized to 1.

However, the gamma curves applied to each of the white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may be different from each other, and the specific gray level is between the minimum gray level (0 gray level) and the maximum gray level (255) level. Data voltages applied to each of the white sub-pixels W ₁ _SPX, W ₂ _SPX, and W ₃ _SPX may be different for .

For example, in the grayscale G1 of FIG. 26 , a data voltage corresponding to the grayscale G1 may be applied to _{each of the white sub-pixels W 1} _SPX, W ₂ _SPX, and W _{3 _SPX, and each white sub-pixel W 1} _SPX, W ₂ _SPX, W ₃ _SPX) may have different data voltages corresponding to the G1 grayscale.

For example, in the G1 grayscale, the _{data voltage applied to the first white sub-pixel W 1} _SPX is the largest, followed by the second white sub-pixel W ₂ _SPX and the third white sub-pixel W ₃ _SPX in that order. The applied data voltage may be reduced.

Accordingly, in the G1 grayscale, the _{luminance of the light passing through the first white sub-pixel W 1} _SPX may be the greatest, and the second white sub-pixel W ₂ _SPX and the third white sub-pixel W ₃ _SPX are sequential. The luminance of light transmitted through the

Referring to FIG. 27 , tilt angles of liquid crystals corresponding to _{each of the white sub-pixels W 1} _SPX, W ₂ _SPX, and W ₃ _SPX may be different in a specific gray level, that is, the G1 gray level, which is The luminance of light passing through the sub-pixels W ₁ _SPX, W ₂ _SPX, and W _{3 _SPX may be different.}

In some embodiments of the present invention, the liquid crystal corresponding to each sub-pixel may be arranged in a plurality of directions, for example, 4 directions. This can be achieved by forming a pattern that pre-tilts the liquid crystal in 4 directions in each sub-pixel. That is, although not shown, each sub-pixel may include a plurality of domains that are divided based on the direction in which the liquid crystal is lying, which may alleviate color distortion according to the viewing angle of the display device.

Furthermore, different gamma curves may be applied to the first to third white sub-pixels W_SPX, which may reduce color distortion according to the viewing angle of the display device in a low grayscale region. For example, since different gamma curves are applied to the first to third white sub-pixels W_SPX, the first white sub-pixel W ₁ _SPX transmits a portion of light in the low grayscale region, but the second white sub-pixel (W ₂ _SPX) and the third white sub-pixel (W ₃ _SPX) may block most of the light. Accordingly, in the low gradation region, _{the expression accuracy in which the white sub-pixels W 1} _SPX, W ₂ _SPX, and W ₃ _SPX express small variations in the gradation level in the low gradation region can be increased, and in particular, in the low gradation region It is possible to reduce gamma distortion that occurs at a wide viewing angle of

Embodiments of the present invention have been described above with reference to the accompanying drawings. Although the field-sequential driving in which the light source sequentially provides the red light (R), the green light (G), and the blue light (B) has been mainly described in the described embodiments, the present invention is not limited thereto.

In another embodiment of the present invention, the display substrate 100 receives white light from the backlight unit 400 , or light of a color corresponding to each pixel, for example, the red sub-pixel R_SPX is red. Light (R), green sub-pixel (G_SPX) is green light (G), blue sub-pixel (B_SPX) is blue light (B), and white sub-pixels (W ₁ _SPX, W ₂ _SPX, W ₃ _SPX) are white light may be authorized separately.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: display substrate 200: liquid crystal layer
300: counter substrate 400: backlight unit
CF: color filter POL1: first polarizing plate
POL2: second polarizing plate

Claims (22)

a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines;
a light source for sequentially supplying a first color light, a second color light, and a third color light to the display substrate;
A first filter region that transmits the first color light, a second filter region that transmits the second color light, a third filter region that transmits the third color light, and the first color light and the second color light and a color filter including a fourth filter region that transmits the third color light,
The plurality of pixels may include at least a first pixel overlapping the first filter area of the color filter, a second pixel overlapping the second filter area of the color filter, and overlapping the third filter area of the color filter. a third pixel and a fourth pixel overlapping the fourth filter region of the color filter,
In the first mode,
During a first sub-frame in which the first color light is provided, the first pixel and the fourth pixel control the degree of transmission of the first color light, and the second pixel and the third pixel control the first color light. block the light,
During a second sub-frame in which the second color light is provided, the second pixel and the fourth pixel adjust the degree of transmission of the second color light, and the first pixel and the third pixel control the second color light. to block,
During a third sub-frame in which the third color light is provided, the third pixel and the fourth pixel adjust the degree of transmission of the third color light, and the first pixel and the second pixel control the third color light to block,
In the second mode,
During a first sub-frame in which the first color light is provided, the first pixel adjusts the degree of transmission of the first color light, and the second pixel, the third pixel, and the fourth pixel transmit the first color light. to block,
During a second sub-frame in which the second color light is provided, the second pixel adjusts the degree of transmission of the second color light, and the first pixel, the third pixel, and the fourth pixel transmit the second color light. to block,
During a third sub-frame in which the third color light is provided, the third pixel adjusts the degree of transmission of the third color light, and the first pixel, the second pixel, and the fourth pixel transmit the third color light. blocking display device. The display device of claim 1 , wherein the first color light is red light, the second color light is green light, and the third color light is blue light. The method of claim 2, wherein the first filter region is a red filter region selectively passing red light, the second filter region is a green filter region selectively passing green light, and the third filter region is blue light. The display device is a blue filter region that selectively passes through, and the fourth filter is a white filter region that passes all of the red light, the green light, and the blue light. The surface light source of claim 1 , wherein the light source is a surface light source disposed on a surface opposite to the display surface of the display substrate, and the surface light source includes one or more red light sources, one or more green light sources, and one or more disposed on at least one side of the surface light source. A display device that is an edge-type surface light source including a blue light source. The display device of claim 1 , wherein the light source directs an object or space opposite to the display surface of the display substrate, and the reflected light of the light directed to the object or the space is provided toward the display substrate. The light source of claim 1 , wherein the light source is a planar light source disposed on a surface opposite to a display surface of the display substrate, and the light source comprises a plurality of blocks disposed in a matrix shape, each of the plurality of blocks emit light. A display device whose intensity is adjustable. 7. The light source of claim 6, wherein the light source comprises a plurality of first color LEDs, a plurality of second color LEDs, and a plurality of third color LEDs, a plurality of first color LEDs, a plurality of second color LEDs, and a plurality of third color LEDs. A display device for sequentially supplying the first color light, the second color light, and the third color light to the display substrate by sequentially turning on and turning off the three color LEDs. The display device of claim 6 , wherein a magnitude of a current or a voltage provided to each block of the light source is adjustable for each block according to an image image corresponding to each block. The method of claim 6 , wherein the light source includes first to nth block lines (n is a natural number greater than or equal to 2), and each of the first to nth block lines includes one or more rows of the plurality of blocks, and The first to nth block lines emit light and emit light sequentially from the first block line to the nth block line. The display device of claim 9 , wherein a time when one block line among the first to n-th block lines emits light and a time when a next block line emits light overlap during an overlap time. The display device of claim 1 , wherein the first mode is a mixed field sequential driving mode. The display device of claim 1 , wherein the second mode is a low temperature field sequential driving mode. The method of claim 1, further comprising a temperature sensor,
The temperature sensor senses an external temperature, and when the temperature falls below a specific temperature according to the sensed temperature, the display device operates in the second mode and when the temperature is above the specific temperature, the display device operates in the first mode display device that works with The method of claim 1, further comprising an optical sensor,
The light sensor senses an external light intensity, and according to the sensed light intensity, the display device operates in the second mode at night time and the display device operates in the first mode during the daytime according to the sensed light intensity. The display device of claim 1 , wherein the plurality of pixels further include a fifth pixel and a sixth pixel overlapping the fourth filter region. The display device of claim 15 , wherein data voltages to which different gamma voltage curves are applied are applied to the fourth pixel, the fifth pixel, and the sixth pixel. The display device of claim 16 , wherein data voltages applied to the fourth pixel, the fifth pixel, and the sixth pixel are different for one grayscale between the minimum grayscale and the maximum grayscale. 16. The method of claim 15, wherein the first pixel, the second pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel are arranged in a matrix shape, and the first pixel and A first column in which the fourth pixels are repeatedly alternately arranged, a second column in which the fifth and second pixels are repeatedly alternately arranged in a column direction, and the third pixel and the sixth pixel are repeatedly alternately arranged in a third direction A display device including a third column, wherein the first pixel, the fifth pixel, the third pixel, the fourth pixel, the second pixel, and the sixth pixel are repeatedly arranged in a row direction. The display device of claim 18 , wherein data voltages to which different gamma voltage curves are applied are applied to the fourth pixel, the fifth pixel, and the sixth pixel. The display device of claim 19 , wherein data voltages applied to the fourth pixel, the fifth pixel, and the sixth pixel are different for one grayscale between the minimum grayscale and the maximum grayscale. a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines;
a light source providing light to the display substrate;
A color filter comprising a red filter region transmitting red light, a green filter region transmitting green light, a blue filter region transmitting blue light, and a white filter region transmitting the red light, the green light, and the blue light The plurality of pixels includes at least a first pixel overlapping the red filter area of the color filter, a second pixel overlapping the green filter area of the color filter, and the blue filter area of the color filter a third pixel and a fourth pixel, a fifth pixel, and a sixth pixel overlapping the white filter area of the color filter;
Data voltages to which different gamma voltage curves are applied are applied to the fourth pixel, the fifth pixel, and the sixth pixel;
In mixed field sequential driving mode,
During a first sub-frame in which the red light is provided, the first pixel, the fourth pixel, the fifth pixel, and the sixth pixel adjust the degree of transmission of the red light, and the second pixel and the third pixel The pixel blocks the red light,
During a second sub-frame in which the green light is provided, the second pixel, the fourth pixel, the fifth pixel, and the sixth pixel adjust the degree of transmission of the green light, and the first pixel and the third pixel blocks the green light,
During a third sub-frame in which the blue light is provided, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel adjust the degree of transmission of the blue light, and the first pixel and the second pixel blocks the blue light,
In the low-temperature field sequential drive mode,
During the first sub-frame in which the red light is provided, the first pixel adjusts the degree of transmission of the red light, and the second pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel blocks the red light,
During a second sub-frame in which the green light is provided, the second pixel adjusts the degree of transmission of the green light, and the first pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel blocks the green light,
During a third sub-frame in which the blue light is provided, the third pixel adjusts the degree of transmission of the blue light, and the first pixel, the second pixel, the fourth pixel, the fifth pixel, and the sixth pixel A display device that blocks the blue light. a display substrate including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines;
a light source providing light to the display substrate;
A color filter comprising a red filter area transmitting red light, a green filter area transmitting green light, a third filter area transmitting blue light, and a white filter area transmitting the red light, the green light, and the blue light The plurality of pixels includes at least a first pixel overlapping the red filter area of the color filter, a second pixel overlapping the green filter area of the color filter, and overlapping the blue filter area of the color filter. a third pixel and a fourth pixel, a fifth pixel, and a sixth pixel overlapping the white filter area of the color filter;
The first pixel, the second pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel are arranged in a matrix shape, and the first pixel and the fourth pixel are repeated in a column direction a first column alternately arranged, a second column in which the fifth and second pixels are repeatedly alternately arranged in a column direction, and a third column in which the third pixel and the sixth pixel are repeatedly alternately arranged in a third direction; wherein the first pixel, the fifth pixel, the third pixel, the fourth pixel, the second pixel, and the sixth pixel are repeatedly arranged in a row direction,
In mixed field sequential driving mode,
During a first sub-frame in which the red light is provided, the first pixel, the fourth pixel, the fifth pixel, and the sixth pixel adjust the degree of transmission of the red light, and the second pixel and the third pixel The pixel blocks the red light,
During a second sub-frame in which the green light is provided, the second pixel, the fourth pixel, the fifth pixel, and the sixth pixel adjust the degree of transmission of the green light, and the first pixel and the third pixel blocks the green light,
During a third sub-frame in which the blue light is provided, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel adjust the degree of transmission of the blue light, and the first pixel and the second pixel blocks the blue light,
In the low-temperature field sequential drive mode mode,
During the first sub-frame in which the red light is provided, the first pixel adjusts the degree of transmission of the red light, and the second pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel blocks the red light,
During a second sub-frame in which the green light is provided, the second pixel adjusts the degree of transmission of the green light, and the first pixel, the third pixel, the fourth pixel, the fifth pixel, and the sixth pixel blocks the green light,
During a third sub-frame in which the blue light is provided, the third pixel adjusts the degree of transmission of the blue light, and the first pixel, the second pixel, the fourth pixel, the fifth pixel, and the sixth pixel A display device that blocks the blue light.

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