KR20040062182A - array circuit board of LCD - Google Patents

Abstract

According to an exemplary embodiment of the present invention, an array substrate for a liquid crystal display device includes a display area in which subpixels defined by a plurality of gate lines and data lines are formed in a matrix form and light is selectively transmitted through the subpixels; An array substrate for a liquid crystal display device formed in an outer portion of a liquid crystal display and divided into a non-display region through which light is impermeable.

The data line may be further formed on a side of the subpixel driven by the last data line of the plurality of data lines formed in the display area.

According to the present invention, an additional data line is formed on the right side of the subpixel driven by the last data line formed in the array unit, thereby preventing light leakage occurring in the subpixel area, thereby improving the display screen quality. There is this.

Description

Array board for liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to an array substrate for a liquid crystal display device further forming a data line adjacent to a subpixel driven by the last data line formed in the array portion of the array substrate.

In general, the driving principle of the liquid crystal display device uses the optical anisotropy and polarization of the liquid crystal. Since the liquid crystal is thin and long in structure, the liquid crystal has directivity in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Accordingly, if 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. The liquid crystal may be classified into a positive liquid crystal having a positive dielectric anisotropy and a negative liquid crystal having a negative dielectric anisotropy according to an electrical property classification, and the liquid crystal molecules having a positive dielectric anisotropy may be formed of liquid crystal molecules in a direction in which an electric field is applied. The long axes are arranged in parallel, and the liquid crystal molecules having negative dielectric anisotropy are arranged in the direction in which the electric field is applied and the long axes of the liquid crystal molecules are vertical.

Currently, an active matrix LCD in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner is generally used because of its excellent resolution and video performance.

The structure of the liquid crystal panel, which is a basic component of the liquid crystal display, is as follows.

1 is an exploded perspective view showing a part of a conventional liquid crystal display device.

Referring to FIG. 1, a conventional color liquid crystal display device includes a black matrix 8 and a sub color filter (red, green, blue) 6, and an upper substrate 5 on which a transparent common electrode 18 is entirely formed. And a lower substrate 22 having an array wiring including a subpixel P, a pixel electrode 17 formed on the subpixel, and a thin film transistor T as a switching element. The liquid crystal 14 described above is filled between the lower substrates 22.

In this case, the upper substrate 5 is also referred to as a color filter substrate, and in particular, the black matrix 8 serves to distinguish and block light between the sub color filters 6.

In addition, the lower substrate 22 is also referred to as an array substrate, and the thin film transistor T, which is a switching element, is disposed in a matrix form, and the gate line 13 and the data line 15 passing through the plurality of thin film transistors are formed. do. In addition, a gate pad 16 and a data pad 19 for applying a predetermined signal to the line are formed at ends of the gate line 13 and the data line 15, respectively.

In addition, the subpixel P is defined in an area where the gate line 13 and the data line 15 cross each other, and the pixel electrode 17 formed on the subpixel P is indium-tin-oxide. A transparent conductive metal having a relatively high light transmittance, such as (ITO), is used.

Here, when a gate voltage is applied to the gate electrode 31 of the thin film transistor through the gate line 13, a signal voltage flowing through the data line 15 is active from the source electrode 33 to the drain electrode 35. Operate to be applied through the layer.

In addition, when a signal voltage is applied to the source electrode 32, a voltage is applied to the pixel electrode 17 connected to the source electrode 32 to generate a voltage difference between the pixel electrode 17 and the common electrode 18. do. Due to the voltage difference between the pixel electrode 17 and the common electrode 18, the molecular arrangement of the liquid crystal 14 interposed therebetween changes, and the molecular arrangement of the liquid crystal 14 changes so that light of the pixel is changed. The transmission amount is changed to cause a color difference between the pixel to which the signal voltage is applied and the pixel to which the signal voltage is not applied, and the color difference is used to control the image of the display device.

That is, in the liquid crystal panel configured as described above, the liquid crystal layer 14 disposed on the pixel electrode 17 is aligned by a signal applied from the thin film transistor T, and the liquid crystal layer 14 is aligned with the alignment degree of the liquid crystal layer 14. Accordingly, the image can be expressed by controlling the amount of light passing through the liquid crystal layer 14.

In addition, the array substrate 22 is a region in which each of the subpixels P is formed in a matrix form, that is, a display region 20 that is an array portion, and the array in which the subpixels P are not formed. It is divided into a non-display area 21, which is an outer portion of the substrate 22, and is covered by the black matrix 8 area of the color filter substrate 5 with respect to the non-display area 21. Only the light transmitted through the region 20 is transmitted through the sub color filter (red, green, blue) 6 of the color filter substrate 5 through the liquid crystal layer 14 to be represented as various images. Each of the subpixels P corresponds to the red, green, and blue sub color filters 6, and three adjacent subpixels corresponding to the red, green, and blue sub color filters 6 are gathered. To form pixels.

However, when the liquid crystal panel is formed with the conventional structure as described above, when light is incident from the backlight mounted under the liquid crystal panel, light leakage occurs in an undesired area, thereby causing a stain on the display screen.

In particular, in the liquid crystal panel according to the conventional structure, the blue color of the subpixel P ', ie, the last line of the upper substrate, driven by the last data line 15' of the array portion, which is the display area 20, of the subpixels. The subpixels P 'corresponding to the sub color filter 6' have a disadvantage in that light leakage occurs more than other subpixels P in the center of the array unit.

This means that the subpixels P 'driven by the last data line 15' do not have a data line formed to the right of the subpixels P ', but other subs in the center portion of the other array portion. Since the pixels P have data lines 15 formed on both sides of the subpixels P, other subpixels P except for the subpixels P ′ driven by the last data line 15 'are formed. ) Are uniformly subjected to the coupling phenomenon of the electric field by the data lines 15 formed at both sides, and the subpixels P 'driven by the last data line 15' are not. This is because the array of is slightly different.

FIG. 2 is a cross-sectional view of the specific area A-A 'of FIG. 1. This is a cross section of one pixel formed at the end of the array portion and includes three subpixels.

Referring to FIG. 2, the pixel 30 is formed by gathering three adjacent subpixels P1, P2, and P ′ as described above, and each pixel formed in each subpixel P1, P2, and P ′. The molecular arrangement of the liquid crystal 14 interposed between the electrodes 17 is changed due to the voltage difference with the common electrode 18 formed on the upper substrate. As such, the molecular arrangement of the liquid crystal 14 is changed. The light transmittance of each of the subpixels P1, P2, and P 'is changed by changing the voltage difference between the pixel electrode 17 and the common electrode 18. The left side of the pixel electrode 17 Is the data line 15 arranged on the right side.

That is, the voltage between the pixel electrode 17 and the common electrode 18 is affected to some extent by the coupling phenomenon of the electric field by the data line 15, and thus the molecular arrangement of the liquid crystal 14 is also affected. Will receive.

At this time, each of the subpixels P1 and P2 is arranged on the left and right sides of the data line 15 so that the subpixels P1 and P2 receive the same coupling effect by the data line 15. Is not abnormal, but the subpixels P ′ driven by the last data line 15, ie, the subpixels P ′ corresponding to the blue subcolor filter 6 ′ of the last line of the upper substrate, are used. The data lines are not formed on the right side thereof, so that they have an arrangement of liquid crystals different from the other subpixels P1 and P2.

Accordingly, since the subpixel P ', that is, the subpixels P' driven by the last data line 15 'has a different arrangement of liquid crystals than the other subpixels P1 and P2, the amount of light transmitted There is a disadvantage that light leakage occurs due to the difference.

The present invention provides an array substrate for a liquid crystal display device which prevents light leakage occurring in the subpixel region by additionally forming a data line on the right side of a subpixel driven by the last data line formed in the array portion of the array substrate. The purpose is.

1 is an exploded perspective view showing a part of a conventional liquid crystal display device.

FIG. 2 is a cross-sectional view of a specific area A-A 'of FIG. 1.

3 is an exploded perspective view showing a part of a liquid crystal display device according to the present invention;

4 is a cross-sectional view of a specific area B-B 'of FIG.

<Explanation of symbols for the main parts of the drawings>

6: Sub color filter 6 ': Blue sub color filter of last line

8: black matrix 13: gate line

15: data line 15 ': last data line

17 pixel electrode 20 display area

21: Non-display area P, P1, P2: sub pixel

P ': subpixel driven by the last data line

40: data line added

In order to achieve the above object, an array substrate for a liquid crystal display according to the present invention includes a display in which subpixels defined by a plurality of gate lines and data lines are configured in a matrix form and light is selectively transmitted through the subpixels. An array substrate for a liquid crystal display device, which is formed in an area and an outer portion of the display area and is divided into a non-display area through which light is impermeable.

The data line may be further formed on a side of the subpixel driven by the last data line of the plurality of data lines formed in the display area.

In addition, a plurality of gate lines are formed in a horizontal direction, a plurality of data lines are formed in a direction perpendicular to the gate line, and the subpixels include a thin film transistor and a pixel electrode.

The data line further formed on the side of the subpixel driven by the last data line may be formed to be drawn out from the last data line in the non-display area.

In addition, the liquid crystal display device according to the present invention in order to achieve the above object and the above-described array substrate for a liquid crystal display device; A color filter substrate including a black matrix and sub color filters of red, green and blue, and a color filter substrate having a transparent common electrode formed on the color filter; It characterized in that the liquid crystal layer interposed between the array substrate and the color filter substrate.

According to the present invention, the data line is additionally formed on the right side of the subpixel driven by the last data line formed in the array unit, thereby preventing light leakage occurring in the subpixel area, thereby improving the quality of the display screen. There is this.

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

3 is an exploded perspective view showing a part of a liquid crystal display device according to the present invention. However, this corresponds to the same area as a part of the conventional liquid crystal display shown in FIG. 1, and accordingly, the same reference numerals are used for the same components as those of FIG. 1.

Referring to FIG. 3, a color liquid crystal display according to the present invention includes a color filter 7 including a black matrix 8 and a sub color filter (red, green, blue) 6, and a common electrode transparent on the color filter. An upper substrate 5 having an 18 formed thereon, and a lower substrate having an array wiring including a subpixel P, a pixel electrode 17 formed on the subpixel P, and a thin film transistor T as a switching element ( 22) and the liquid crystal 14 is filled between the upper substrate 5 and the lower substrate 22.

Here, the upper substrate 5 is also referred to as a color filter substrate, and in particular, the black matrix 8 plays a role of distinguishing and blocking light between the sub color filters 6.

In addition, the lower substrate 22 is also referred to as an array substrate, and the thin film transistor T, which is a switching element, is disposed in a matrix form, and the gate line 13 and the data line 15 passing through the plurality of thin film transistors are formed. do. In addition, a gate pad 16 and a data pad 19 for applying a predetermined signal to the line are formed at ends of the gate line 13 and the data line 15, respectively.

In addition, the subpixels P defined by the plurality of gate lines 13 and the data lines 15 have relatively high light transmittance, such as the thin film transistors T and indium tin oxide. The pixel substrate 17 includes a pixel electrode 17 made of an excellent transparent conductive metal, and the array substrate includes a display area 20 through which light is selectively transmitted through the subpixel P, and the display area ( 20 is divided into a non-display area 21 formed at an outer portion of the light-transmitting part. At this time, the non-display area 21 is covered by the black matrix 8 area of the color filter substrate 5.

According to the present invention, the data line 40 is additionally formed on the side of the subpixel P ′ driven by the last data line 15 ′ among the plurality of data lines 15 formed in the display area 20. It is characterized by. This is to perform the same liquid crystal arrangement as the other subpixels P with respect to the subpixels P 'driven by the last data line 15', thereby generating in the subpixels P 'region. It is possible to improve the quality of the display screen by preventing light leakage.

Here, the operation of the liquid crystal panel will be briefly described as follows. First, when a gate voltage is applied to the gate electrode 31 of the thin film transistor T through the gate line 13, a signal voltage flowing through the data line 15 is transferred from the source electrode 33 to the drain electrode 35. In this way, it operates to be applied through the active layer.

In addition, when a signal voltage is applied to the source electrode 32, a voltage is applied to the pixel electrode 17 connected to the source electrode 32 to generate a voltage difference between the pixel electrode 17 and the common electrode 18. do. Due to the voltage difference between the pixel electrode 17 and the common electrode 18, the molecular arrangement of the liquid crystal 14 interposed therebetween is changed. The light transmittance is changed to generate a color difference between the pixel to which the signal voltage is applied and the pixel to which the signal voltage is not applied, and the color difference is used to control the screen of the display device.

That is, in the liquid crystal panel configured as described above, the liquid crystal layer 14 disposed on the pixel electrode 17 is aligned by a signal applied from the thin film transistor T, and the liquid crystal layer 14 is aligned with the alignment degree of the liquid crystal layer 14. Accordingly, the image can be expressed by controlling the amount of light passing through the liquid crystal layer 14.

Accordingly, only light transmitted through the display area 20 passes through the sub color filter (red, green, blue) 6 of the color filter substrate 5 through the liquid crystal layer 14 to be represented as various images. In this case, the subpixels P correspond to the red, green, and blue sub color filters 6, respectively, and the three adjacent pixels corresponding to the red, green, and blue sub color filters 6, respectively. The subpixels come together to form one pixel.

The most distinctive feature of the present invention from the conventional liquid crystal display is that the side of the sub-pixel P 'is driven by the last data line 15' of the plurality of data lines 15 formed in the display area 20. The data line 40 is additionally formed at the upper side, and the light leakage phenomenon is prevented by applying the same coupling phenomenon generated by the data lines 15 and 40 to the subpixel P '. .

That is, in the related art, the subpixel P 'driven by the last data line 15' of the array unit, which is the display area 20, among the subpixels, that is, the blue subcolor filter 6 'of the last line of the upper substrate. ), The subpixels P 'are more light leaked than the other subpixels 6 in the center of the array, which is driven by the last data line 15'. P ') is because a data line is not formed on the right side of the subpixel.

In more detail, the other subpixels P in the center of the array portion except for the subpixel P ′ driven by the last data line 15 'of the array portion are centered on the subpixel P. Since the data lines 15 are formed on both sides, both of them receive a uniform coupling phenomenon of the electric field by the data lines 15 formed on both sides, but the sub-pixels driven by the last data line 15 '. (P ') is not such that the arrangement of the liquid crystal is different from the other sub-pixels (P) to cause light leakage phenomenon. To overcome this, the present invention is directed to the sub-pixel (P') driven by the last data line 15 '. The data line 40 is additionally formed on the side of '), and thus, the subpixel P' also has a uniform coupling phenomenon between the data lines 15 'and 40 provided at both sides, like the other subpixels P'. Ha It is possible to prevent abnormal alignment of conventional liquid crystals.

In this case, the data line 40 additionally formed on the side of the subpixel P 'driven by the last data line 15' is drawn out from the last data line 15 '. The portion to be drawn out is the upper portion non-display area 21 of the display area 20. Accordingly, the same signal as the last data line 15 ′ is always applied to the added data line 40.

FIG. 4 is a cross-sectional view of the specific area B-B 'of FIG. 3. This is a cross section of one pixel formed at the end of the array portion, which includes three subpixels, which corresponds to the conventional drawing shown in FIG. 2, and accordingly the same reference numerals are used for the same components as in FIG. 2. Do it.

Referring to FIG. 4, the pixel 30 is formed by gathering three adjacent subpixels P1, P2, and P ′ as described above, and each pixel formed in each of the subpixels P1, P2, and P ′. Due to the difference in voltage with the common electrode 18 formed on the upper substrate, the electrode 17 changes the molecular arrangement of the liquid crystal 14 interposed therebetween.

As the molecular arrangement of the liquid crystal 14 is changed as described above, the light transmittance of each subpixel P1, P2, P ′ is changed, and at this time, the voltage difference between the pixel electrode 17 and the common electrode 18 is changed. Affecting are the data lines 15 and 15 'arranged on the left and right sides of the pixel electrode 17. FIG.

That is, the voltage between the pixel electrode 17 and the common electrode 18 is affected to some extent by the coupling phenomenon of the electric field by the data line 15, and thus the molecular arrangement of the liquid crystal 14 is also affected. Will receive.

At this time, each of the sub-pixels P has data lines 15 arranged on the left and right sides thereof, so that the sub-pixels P receive the coupling effect by the data lines 15 uniformly. In the present invention, the subpixels P 'driven by the last data line 15' are also left and right of the subpixels by the data line 40 additionally formed on the side thereof. And 40), the coupling effect is uniformly received as in the other subpixels P1 and P2, and the arrangement of the liquid crystals does not change.

That is, the data line 40 is further formed on the right side of the subpixels P 'corresponding to the blue sub color filter 6' of the last line of the upper substrate, so that the other subpixels P1 and P2 are formed. And will have the same liquid crystal array. Accordingly, it is possible to prevent the light leakage phenomenon generated for the subpixel P ', that is, the subpixels P ′ driven by the last data line 15'.

According to the liquid crystal display according to the present invention as described above, by additionally forming a data line on the right side of the subpixel driven by the last data line formed in the array portion, to prevent light leakage phenomenon generated in the subpixel region There is an advantage of improving the quality of the display screen.

Claims (4)

A subpixel defined by a plurality of gate lines and data lines is formed in a matrix form, and a display region in which light is selectively transmitted through the subpixel, and a ratio in which light is opaque formed at an outer portion of the display region. In an array substrate for a liquid crystal display device divided into a display area, And a data line is formed on a side of the subpixel driven by a last data line among the plurality of data lines formed in the display area. The method of claim 1, A plurality of gate lines are formed in a horizontal direction, a plurality of data lines are formed in a direction perpendicular to the gate line, and the subpixels are formed of a thin film transistor and a pixel electrode. . The method of claim 1, And a data line further formed on a side of the subpixel driven by the last data line is formed to be drawn out from the last data line in the non-display area. An array substrate for a liquid crystal display device according to any one of claims 1 to 3, A color filter substrate including a black matrix and sub color filters of red, green, and blue, a color filter substrate having a transparent common electrode formed on the color filter; And a liquid crystal layer interposed between the array substrate and the color filter substrate.