KR101035924B1 - Color filter array substrate - Google Patents

Abstract

The present invention provides a color filter array substrate capable of improving color expressing ability in the vertical direction and at the same time, as well as improving color sharpness in a diagonal direction. A first sub pixel having an R (red) color filter and a second sub pixel having a G (green) color filter arranged side by side in a left and right direction; A third sub pixel having a B (blue) color filter arranged in a lower direction of the second sub pixel; And a unit pixel which is arranged side by side in a right direction of the third sub pixel and comprises a fourth sub pixel having one color filter selected from among Y (yellow), C (cyan), and M (magenta) color filters. The unit pixels are shifted and disposed by two subpixels, respectively, on the right side and the bottom side in a diagonal direction.

Subpixel, color representation, color filter

Description

Color Filter Array Substrate {COLOR FILTER ARRAY SUBSTRATE}

1 is a partially exploded perspective view of a typical TN mode liquid crystal display << EZ03-0074 >>

2 is a layout plan view of a color filter array substrate according to the related art.

3 is a layout plan view of a color filter array substrate according to another conventional technology

4 is a layout plan view of a color filter array substrate according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

41, 42, 43, and 44: first, second, third, and fourth sub pixels

45: unit pixels

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a color filter array substrate having no restriction on color expression ability in up, down, left and right directions.

As the information society develops, the demand for display devices is increasing in various forms.In recent years, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluorescent display (VFD) have been developed. Various flat panel display devices have been studied, and some are already used as display devices in various devices.

Among them, LCD is the most widely used as a substitute for CRT (Cathode Ray Tube) for the use of mobile image display device because of the excellent image quality, light weight, thinness and low power consumption. In addition, it is being developed in various ways, such as a television for receiving and displaying broadcast signals, and a monitor of a computer.

As described above, although various technical advances have been made in order for the liquid crystal display device to serve as a screen display device in various fields, the task of improving the image quality as the screen display device has many advantages and disadvantages.

Therefore, in order to use a liquid crystal display device in various parts as a general screen display device, the key to development is how much high definition images such as high definition, high brightness, and large area can be realized while maintaining the characteristics of light weight, thinness, and low power consumption. It can be said.

Such a liquid crystal display device may be broadly divided into a liquid crystal panel displaying an image and a driving unit for applying a driving signal to the liquid crystal panel, wherein the liquid crystal panel includes first and second glass substrates having a space and are bonded to each other; It consists of a liquid crystal layer injected between the said 1st, 2nd glass substrate.

Here, the first glass substrate (TFT array substrate), a plurality of gate lines arranged in one direction at a predetermined interval, a plurality of data lines arranged at regular intervals in a direction perpendicular to the respective gate lines, A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing each of the gate lines and the data lines, and a plurality of pixels switching the signals of the data lines to the pixel electrodes A thin film transistor is formed.

The second glass substrate (color filter array substrate) includes a black matrix layer for blocking light in portions other than the pixel region, an R, G, and B color filter layer for expressing color colors, and a common image for implementing an image. An electrode is formed. Of course, the common electrode is formed on the first glass substrate in the transverse electric field type liquid crystal display device.

The first and second glass substrates are bonded by a sealing material having a predetermined space by a spacer and having a liquid crystal injection hole, and a liquid crystal is injected between the two substrates.

In this case, in the liquid crystal injection method, the liquid crystal is injected between the two substrates by osmotic pressure when the liquid crystal injection hole is immersed in the liquid crystal container by maintaining the vacuum state between the two substrates bonded by the reality. When the liquid crystal is injected as described above, the liquid crystal injection hole is sealed with a sealing material.

On the other hand, the driving principle of the liquid crystal display device as described above uses the optical anisotropy and polarization of the liquid crystal.

Since the liquid crystal is thin and long in structure, the liquid crystal has a direction in the arrangement of molecules, and the liquid crystal may be artificially applied to control the direction of the molecular arrangement.

Accordingly, when the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light polarized by optical anisotropy may be arbitrarily modulated to express image information.

Such liquid crystals may be classified into positive liquid crystals having a positive dielectric anisotropy and negative liquid crystals having a negative dielectric anisotropy according to an electrical specific classification, and liquid crystal molecules having a positive dielectric anisotropy are long axes of liquid crystal molecules in a direction in which electric fields are applied. The liquid crystal molecules arranged in parallel and having negative dielectric anisotropy are arranged perpendicularly to the direction in which the electric field is applied and the major axis of the liquid crystal molecules.

1 is an exploded perspective view illustrating a part of a general TN liquid crystal display device.

As shown in FIG. 1, the lower substrate 1 and the upper substrate 2 bonded to each other with a predetermined space, and the liquid crystal layer 3 injected between the lower substrate 1 and the upper substrate 2 are composed of. It is.

More specifically, the lower substrate 1 has a plurality of gate lines 4 arranged in one direction at regular intervals to define the pixel region P, and in a direction perpendicular to the gate lines 4. A plurality of data lines 5 are arranged at regular intervals, and a pixel electrode 6 is formed in each pixel region P where the gate line 4 and the data line 5 intersect, and each gate line The thin film transistor T is formed at the portion where (4) and the data line 5 intersect.

The upper substrate 2 includes a black matrix layer 7 for blocking light in portions other than the pixel region P, an R, G, and B color filter layer 8 for expressing color colors, and an image. The common electrode 9 is formed to implement the.                         

The thin film transistor T may include a gate electrode protruding from the gate line 4, a gate insulating film (not shown) formed on the front surface, an active layer formed on the gate insulating film above the gate electrode, and the data. And a source electrode protruding from the line 5 and a drain electrode to face the source electrode.

The pixel electrode 6 uses a transparent conductive metal having a relatively high light transmittance, such as indium-tin-oxide (ITO).

In the liquid crystal display device configured as described above, the liquid crystal layer 3 positioned on the pixel electrode 6 is aligned by a signal applied from the thin film transistor T, and the liquid crystal layer 3 is aligned with the alignment degree of the liquid crystal layer 3. Accordingly, the image can be expressed by controlling the amount of light passing through the liquid crystal layer 3.

As described above, the liquid crystal panel drives the liquid crystal by an electric field applied up and down, and has excellent characteristics such as transmittance and aperture ratio, and the common electrode 9 of the upper substrate 2 serves as a ground to discharge static electricity. It is possible to prevent the destruction of the liquid crystal cell.

As the main task of LCD products to implement video, color implementation is becoming a hot topic.

Hereinafter, a conventional color filter array substrate will be described with reference to the accompanying drawings.

2 is a layout plan view of a color filter array substrate according to the prior art, and FIG. 3 is a layout plan view of a color filter array substrate according to another conventional technology.                         

As shown in FIG. 2, the color filter array substrate according to the related art is repeatedly disposed in the left and right directions such that the first, second, and third sub pixels 21, 22, and 23 form one unit pixel 24. Only the first sub-pixel 21 is disposed in the up-down direction of the first sub-pixel 21, only the second sub-pixel 22 is disposed in the up-down direction of the second sub-pixel 22, Only the third sub pixel 23 is disposed in the vertical direction of the third sub pixel 23.

In this case, the widths of the first, second, and third subpixels 21, 22, and 23 in the horizontal direction are about one third of the width in the vertical direction, respectively. In other words, the unit pixels 24 form a square.

In the above description, the first, second, and third subpixels 21, 22, and 23 are R, G, and B subpixels, respectively.

In general, the configuration of white, black, or black lines of up, down, left, and right is basically formed on the basis of the unit pixel size. Therefore, the basic unit constituting the font is the size of the unit pixel in the vertical direction and the diagonal size of the unit pixel in the diagonal direction.

When the unit pixel 24 is configured as in the conventional art, the color expressing ability in the left and right directions can be adjusted in three colors, but only one color can be represented in the form of stripes without selectivity in the up and down directions.

In addition, the diagonal direction of each unit pixel 24 has shown the sawtooth shape, and the width | variety of the sawtooth shape is large, and the sharpness of a diagonal direction is inferior. In other words, if the width of the sawtooth shape is large, there is a problem in that the sharpness is lowered when the moving picture is implemented with a large number of curves and a lot of image changes.

Next, in the color filter array substrate according to another conventional technique, as shown in FIG. 3, the unit pixel 35 includes four subpixels, and the first and second subpixels 31 and 32 The first and second sub pixels 31 and 32 have the same width as the first and second sub pixels 31 and 32, and the third and fourth sub pixels 33 and 34 are disposed under the same width.

The unit pixels 35 as described above are repeatedly arranged on the top, bottom, left and right sides.

In the above description, the first, second, and third subpixels 31, 32, and 33 are R, G, and B subpixels, respectively, and the fourth subpixel is a white (W) subpixel.

When the color filter array substrate is configured as in the other conventional arts described above, the color expressing ability in the left and right directions can be adjusted in two colors, and the color expressing ability in the up and down directions can be adjusted in two colors.

As described above, the color cannot be expressed evenly in the vertical direction. In addition, the width of the sawtooth shape of two sub-pixels in the diagonal direction also appears, resulting in poor color clarity in the video implementation.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a color filter array substrate that can improve color sharpness in the diagonal direction while improving color expression ability in the vertical direction. It is.

The color filter array substrate of the present invention for achieving the above object includes a color filter configured to use the first to fourth sub-pixels as a unit pixel so as to implement the first to fourth colors in up, down, left, and right symmetry. It is characterized by.

The unit pixels may be arranged in parallel with the first and second sub pixels arranged side by side in the left and right directions, the third sub pixel arranged in the lower direction of the second sub pixel, and in the right direction of the third sub pixel. And a fourth subpixel.

Each of the first to fourth sub-pixels has R, G, B, and X color filters.

The X sub-pixel may include any one of other types of color filters as well as white, yellow, cyan and magenta.

The color filters may be repeatedly arranged in the order of the first, second, third, and fourth sub-pixels in left, right, and up and down directions.

Hereinafter, a color filter array substrate according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

4 is a layout plan view of a color filter array substrate according to an exemplary embodiment of the present invention.

The color filter array substrate according to the embodiment of the present invention is characterized in that the unit pixels of the color filter are configured to implement the first to fourth colors both vertically and horizontally. As described above, the unit pixel 45 of the color filter has the same width in the lower direction of the first and second sub-pixels 41 and 42 and the second sub-pixel 42 arranged side by side in the left-right direction. The third sub pixel 43 is arranged and the fourth sub pixel 44 is arranged side by side with the same width in the right direction of the third sub pixel 43.

In this case, the first to fourth sub pixels 41, 42, 43, and 44 have R, G, B, and X color filters, respectively. The X subpixel may include any one of white, yellow, cyan and magenta as well as other kinds of color filters.

In FIG. 4, the subpixels of the color filter have the first, second, third, and fourth subpixels R, G, B, based on the first subpixel R (41) at the left edge in the left and right directions. X) (41, 42, 43, 44) are repeatedly arranged in order, and the first, second, third, and fourth subpixels (R) 41 are also referred to in the vertical direction. R, G, B, and X are repeatedly arranged in the order of (41, 42, 43, 44).
The first subpixel and the second subpixel are arranged side by side on the right side of the fourth subpixel, and the third subpixel is disposed in the lower direction of the second subpixel, and the right side of the third subpixel is disposed. The fourth sub pixel is arranged again in the direction, so that the unit pixel is repeated in the diagonal direction.

The top, bottom, left and right white lines or black lines are basically formed on the premise of the sub pixel size. Therefore, the basic unit constituting the font is found to be the size of the subpixel in the vertical direction and the sawtooth size of the subpixel in the diagonal direction.

When the color filter is configured as in the present invention, since full color can be expressed in up, down, left and right directions, there is no restriction on the color expression ability. That is, not only R, G, B, and X, but also all colors in combination thereof can be expressed in the vertical direction.

In addition, in the diagonal direction, the sharpness is greatly improved since the width of the sawtooth shape is smaller than that of the prior art and other conventional techniques. For example, compared to other conventional techniques (see FIG. 3), the width of the sawtooth in the diagonal direction is reduced to 1/2, so that the sharpness is improved.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the above embodiments, but should be defined by the claims.

The color filter array substrate of the present invention as described above has the following effects.

First, full color can be expressed in up, down, left, and right directions, thereby improving color expression ability.

Second, in the diagonal direction, the width of the sawtooth shape is reduced compared to the prior art, it is possible to improve the sharpness.

Claims (5)

The order of the selected X color filter among the R (red) color filter, the G (green) color filter, the B (blue) color filter, and the Y (yellow) and C (cyan) color filter on each horizontal line of the subpixels arranged in the matrix. In the color filter array substrate repeatedly arranged in R color filters and B color filters are arranged repeatedly on a diagonal line, The G color filter and the X color filter are shifted by one subpixel and arranged repeatedly so as to be parallel to the R color filter and the B color filter, respectively. The R color filter is disposed on the left side and the upper side of the G color filter, The B color filter is disposed on the right side and the bottom side of the G color filter. delete delete delete delete

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