KR20110077228A - Transflective type liquid crystal display device - Google Patents

Abstract

PURPOSE: A reflection and transmission type LCD device is provided to improve a cell gap in a reflection area without increasing a cell gap in a transmission area with a large value, restrict a white brightness deterioration and restrict the black brightness deterioration. CONSTITUTION: A reflective transmission type liquid crystal display device includes as follows. A first substrate. A plurality of gate wire forms to the first direction on an upper part of the first substrate. A plurality of data wire defines a plurality of pixel area including a reflection area(RA) and a transmission area(TA) by exchanging the gate wire and is formed to a second direction on upper first substrate. A thin film transistor is connected to the gate wire and the data wire which is respectively formed in the plurality of pixel area. A first protective layer covers the data wire and the thin film transistor. A reflective plate is formed on the reflective area of the upper part of the first protective layer. A second protective layer is on the upper part of the projective plate. A pixel electrode is connected to the thin film transistor which is formed on the plurality of pixel area of the second protective layer. A third protective layer is formed on the upper part of the pixel electrode. A common electrode includes a second opening unit of the third direction on the reflection area and includes the plurality of opening unit of the first direction to the transmission area which is formed on the upper part of the third protective layer.

Description

Transflective type liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to a reflective liquid crystal display device having a wide viewing angle and having an improved aperture ratio.

In general, a liquid crystal display device is a display device using characteristics of liquid crystal molecules having different arrangements depending on voltage application. The liquid crystal display device can be driven at a lower power than a cathode ray tube, and is advantageous in miniaturization and thinning. Therefore, the liquid crystal display device is in the spotlight as a flat panel display device, such as a computer monitor and a television. In addition, the liquid crystal display device is used as a display device such as a notebook or a personal portable terminal because of its lightness and thinness and easy portability.

In the liquid crystal display, two substrates on which electrodes are formed are disposed so that the two electrodes face each other, and a liquid crystal is generated by an electric field generated by a voltage difference applied to the two electrodes through a liquid crystal between the two substrates. By controlling the movement of the molecules, it is a device for expressing the image by controlling the transmittance of light that varies accordingly.

On the other hand, the liquid crystal display is a passive device that does not emit light by itself, a separate light source is required. Therefore, the liquid crystal display further includes a backlight for supplying light to a rear surface of the liquid crystal panel including the two substrates and the liquid crystal layer, and the light emitted from the backlight is incident on the liquid crystal panel, The image is displayed by adjusting the amount of light according to the arrangement.

Such a liquid crystal display device is called a transmission type liquid crystal display device. Since the liquid crystal display device uses an artificial light source such as a backlight, a bright image can be realized even in a dark external environment, but the power supply to the backlight must be performed. When used as a display device of the device, a relatively large power consumption (power consumption) is a disadvantage.

Therefore, in order to make up for this drawback, a reflection type liquid crystal display device using an external light source without using a backlight has been proposed.

Since the reflective liquid crystal display device operates by using external natural light or artificial light, the amount of power consumed by the backlight is greatly reduced, so that the power consumption is relatively small compared to the transmissive type, and thus it can be used in a portable state for a long time. It is mainly used as a display element of a portable device such as Digital Assistant.

However, such a reflective liquid crystal display device has an advantage of low power consumption because it does not have a separate light source, but can not be used in a place where the external light is weak or absent.

Therefore, recently, a transflective type liquid crystal display device having the advantages of a reflective liquid crystal display device and a transmissive liquid crystal display device has been proposed. Such a reflective liquid crystal display device is mainly implemented in an electrically controlled birefringence (ECB) mode or a VA (vertical alignment) mode. In the ECB mode, the viewing angle is low. Since a number of compensation films must be additionally configured, there is a problem of increased manufacturing cost.

On the other hand, in the case of the liquid crystal display device, because of its lightweight and thin structure, it has recently escaped from a personal display device such as a portable notebook and is used as a mass media such as a TV. As a result, viewing angles are becoming an important issue.

Therefore, in order to overcome the disadvantages of the low viewing angles of the above-described VA mode and ECB mode liquid crystal display devices, both the common electrode and the pixel electrode are formed on the same substrate and are driven by the transverse electric field, thereby improving the range of the viewing angle. Display devices have been proposed.

FIG. 1 is a cross-sectional view schematically illustrating a conventional transverse electric field mode reflection-transmissive liquid crystal display device, and illustrates a pixel area including a reflection area and a transmission area.

As shown, a gate line (not shown) and a data line (not shown) intersect each other on the first substrate 2 to define a pixel region P, and the gate line (not shown) A common wiring (not shown) extending side by side and penetrating the pixel region P is formed, and each pixel region P is formed with a thin film transistor (not shown) as a switching element. The pixel area P includes a reflection area RA and a transmission area TA.

In addition, the reflective plate 50 is formed of a metal material having good reflectance in the reflective region RA, and the pixel electrode 70 is formed in the pixel region P on the reflective plate 50.

An insulating layer 72 is formed on the pixel electrode 70, and a common electrode 80 connected to the common wiring (not shown) is formed thereon, and the common electrode 80 has a bar shape. It includes a plurality of first and second openings (op1, op2) having a. In this case, the first opening op1 is located in the transmission area TA, and the second opening op2 is located in the reflection area RA. The first and second openings op1 and op2 have different directions.

The second substrate 83 is disposed on the array substrate having such a configuration, and a black matrix (not shown) corresponding to the boundary of the pixel region P and the respective pixel regions are disposed on the inner surface of the second substrate 83. The color filter layer 86 corresponding to (P) and the overcoat layer 88 formed on the entire surface and covering the color filter layer 86 are sequentially formed.

The liquid crystal layer 90 is interposed between the color filter substrate and the array substrate having such a structure.

On the other hand, the first polarizing plate 93 and the second polarizing plate 95 are attached to the outer surfaces of the first and second substrates 2 and 83, respectively.

In the conventional transverse electric field mode reflection-transmissive liquid crystal display having the above-described configuration, the thickness of the liquid crystal layer 90 in the transmission area TA, that is, the first cell gap d1 is the liquid crystal layer in the reflection area RA. It is configured to be twice the thickness of the 90, that is, the second cell gap d2. This is to match the retardation of the light in the liquid crystal layer 90. In the case of the transmission area TA, the user sees the light from the backlight unit (not shown) located under the array substrate. , Light passes through the liquid crystal layer 90 once. On the other hand, in the reflective area RA, since external light is incident on the display area of the liquid crystal display device 1 and reflected by the reflector 50 and then exits to the outside, the light is emitted from the liquid crystal layer ( Pass 90) twice.

Therefore, the light exiting the reflection area RA and the light exiting the transmission area TA have different delay values, so that the reflection area RA forms a cell of λ / 4 so as to match the transmission area TA. Is configured to vary the thickness of the liquid crystal layer 90 to form a cell of λ / 2.

In the conventional transverse electric field mode reflection-transmissive liquid crystal display device, when the polarization axis of the second polarizing plate 95 and the director in the long axis direction of the liquid crystal molecules form 45 degrees in the reflection region RA of λ / 4 cell, black is black. ) Is implemented, and black is implemented when the director and the polarization axis of the second polarizer 95 are arranged side by side in the transmission area TA of λ / 2 cells.

By the way, in the conventional transverse electric field mode reflection-transmissive liquid crystal display device, when the thickness of the liquid crystal layer 90 in the reflection area RA becomes thin, there arises a problem that the reflection efficiency is lowered.

In addition, in the conventional transverse electric field mode reflective transmission liquid crystal display device having the above-described configuration, the white luminance is also reduced. The white luminance deterioration phenomenon is more severe as the cell gap, that is, the thickness of the liquid crystal layer 90 becomes thinner. In other words, when the cell gap becomes thinner, the director nonuniformity for each position is increased, and when driving by applying a voltage, the greater the white luminance change due to the director variation occurs when the director is arranged in parallel with the polarization axis of the second polarizing plate 95. Done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and improves the cell gap in the reflection area without increasing the cell gap in the transmission area having a relatively large value, thereby suppressing a decrease in white brightness defects and further reducing the black brightness. An object of the present invention is to provide a reflection-transmissive liquid crystal display device capable of suppressing the problem.

In addition, through the optimization of the twist angle of the liquid crystal molecules, a reflection-type liquid crystal display device that can increase the degree of freedom of the alignment process and improve productivity per unit time by allowing the orientation by rubbing without performing the divided alignment with respect to the color filter substrate is possible. Another purpose is to provide.

In addition, another object of the present invention is to provide a reflection-transmissive liquid crystal display device capable of reducing the boundary portion of the divided alignment to increase the stability of the liquid crystal alignment and to improve the aperture ratio.

In order to solve the above problems, the reflective liquid crystal display device of the present invention includes a first substrate, a plurality of gate wirings formed in a first direction on the first substrate, and a second direction on the first substrate. A plurality of data lines defining a plurality of pixel regions each including a reflective region and a transmissive region, intersecting the gate lines, and a thin film formed in each of the plurality of pixel regions and connected to the gate lines and the data lines. A first passivation layer covering the transistor, the data line and the thin film transistor, a reflector formed in the reflective region above the first passivation layer, a second passivation layer above the reflector, and the plurality of pixels above the second passivation layer A pixel electrode formed in each of the regions and connected to the thin film transistor, a third protective layer on the pixel electrode, and the third protection A common electrode is formed on the layer and includes a plurality of first openings in the first direction in the transmission area and a plurality of second openings in the third direction in the reflection area. The plurality of pixel areas may include a first pixel area and a second pixel area that are alternately arranged along the second direction, and the transmission area of the first pixel area is adjacent to the transmission area of the second pixel area. The reflection area of the first pixel area is adjacent to the reflection area of the second pixel area.

In addition, the reflective liquid crystal display device of the present invention is formed on a second substrate spaced apart from the first substrate, the inner surface of the second substrate, the reflective region and the transmission region of each of the plurality of pixel regions And a black matrix corresponding to a boundary region therebetween, a color filter layer formed on an inner surface of the second substrate, corresponding to the plurality of pixel regions, and a liquid crystal layer interposed between the first and second substrates. .

Liquid crystal molecules positioned in the reflective region have a different arrangement direction than liquid crystal molecules positioned in the transmission region.

The boundary area corresponds to the gate wiring.

The black matrix surrounds a transmission area of the first pixel area and a transmission area of the second pixel area.

The thickness of the liquid crystal layer in the reflection region is 1 / 1.7 of the thickness of the liquid crystal layer in the transmission region.

The color filter layer has a transmission hole corresponding to a central portion of the reflection area.

The first passivation layer is made of an organic insulating material, and the first passivation layer and the reflecting plate of the reflecting region have an uneven surface.

On the other hand, the reflective transparent liquid crystal display of the present invention is a fourth protective layer made of an inorganic insulating material between the thin film transistor and the first protective layer, and a fifth protective layer made of an inorganic insulating material between the first protective layer and the reflecting plate. The semiconductor device may further include a passivation layer, and further include a sixth passivation layer formed of an organic insulating material between the second passivation layer and the third passivation layer of the reflective region.

The present invention has the effect of improving the cell gap in the reflection area without increasing the cell gap in the transmissive area having a relatively large value, thereby suppressing a decrease in white luminance defect caused by a small cell gap, and suppressing a decrease in black luminance.

In addition, by optimizing the twist angle of the liquid crystal molecules, the split alignment structure of the transmissive region and the reflective region is configured in a single direction, so that the alignment due to rubbing is not performed due to the partial alignment that is partially different in the alignment direction with respect to the color filter substrate. By making it possible, there is an effect of increasing the degree of freedom of the alignment process and productivity per unit time.

In addition, the transmissive regions of adjacent pixel regions may be arranged so that the transmissive regions and the reflecting regions are positioned to reduce the boundary portions of the divisional orientation in which the foreground occurs. Therefore, there exists an effect which can raise the stability of liquid crystal orientation, and can improve an aperture ratio.

Hereinafter, the transverse electric field mode reflective transmission liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a plan view of one pixel area of a transverse electric field mode reflection-transmissive liquid crystal display device according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of a portion taken along the cutting line III-III of FIG. 2. . For convenience of description, a region in which the thin film transistor Tr, which is a switching element, is formed in the pixel region P is defined as a switching region TrA, and a portion in which the reflector is formed in the pixel region P is the reflective region RA. In addition, the other area | region is defined as the transmission area TA. In addition, in FIG. 2, the black matrix and the color filter layer are omitted.

As illustrated, the gate wiring 103 in the first direction and the data wiring 125 in the second direction cross each other to define the pixel region P on the first substrate 101. A common wiring 109 extending in parallel with the wiring 103 and penetrating the pixel region P is formed. In this case, the first storage electrode 110 and the second storage electrode 111 extending from the common wiring 109 are formed. The first storage electrode 110 is located in the reflective area RA, and the second storage is formed. The electrode 111 overlaps the data line 125.

In addition, a thin film transistor Tr connected to the gate line 103 and the data line 125 is formed in each pixel area P. The thin film transistor Tr includes a gate electrode 106, a gate insulating film 115, an active layer 120a of pure amorphous silicon, an ohmic contact layer 120b of impurity amorphous silicon, and a source and drain electrode 130. 133). The active layer 120a and the ohmic contact layer 120b form the semiconductor layer 120, and the source and drain electrodes 130 and 133 are spaced apart from each other on the gate electrode 106. The active layer 120a between the source and drain electrodes 130 and 133 becomes a channel of the thin film transistor Tr.

The drain electrode 133 extends to the reflective region RA, overlaps the first storage electrode 110 with the gate insulating layer 115 therebetween, and overlaps the first storage electrode 110 with each other. The drain electrode 133 includes the gate insulating layer 115 interposed between the two electrodes 110 and 133 to form a first storage capacitor StgC1. In addition, the second storage electrode 111 and the data line 125 overlapping each other with the gate insulating layer 115 interposed therebetween to form a second storage capacitor StgC2.

A first protective layer 136 is formed of an inorganic insulating material on the thin film transistor Tr and the data line 125, and the second protective layer 140 of an organic insulating material is formed on the first protective layer 136. It is formed on the front surface. At this time, the second protective layer 140 has convex and convexities on the surface thereof in the reflective region RA.

In addition, a third passivation layer 142 of an inorganic insulating material is formed on the second passivation layer 140, and the reflecting region RA is formed of a metal material having good reflectance on the third passivation layer 142. The reflecting plate 150 is formed. At this time, the third protective layer 142 and the reflective plate 150 is characterized in that the surface of the convex concave-convex shape due to the influence of the second protective layer 140 formed on the bottom.

In the first embodiment of the present invention, the first to third protective layers 136, 140 and 142 are shown as an example, but the first and third protective layers 136 and 142 may be omitted. It may be. The first protective layer 136 made of an inorganic insulating material is in contact with the active layer 120a, and the channel contamination that may occur when the second protective layer 140 of the organic insulating material is in contact with the active layer 120a. And a third protective layer 142 that is formed to prevent deterioration of the characteristics of the thin film transistor Tr. The third protective layer 142 is a solution for weakening adhesion between the organic insulating material and the metal material, and includes a reflector plate 150 made of a metal material. And the second protective layer 140 made of an organic insulating material.

Next, a fourth passivation layer 152 is formed on the reflective plate 150 to correspond to the reflective region RA. The fourth protective layer 152 is used to induce a cell gap difference between the transmission area TA and the reflection area RA.

In addition, a fifth passivation layer 155 is formed on the entire surface of the fourth passivation layer 152 and the third passivation layer 142 as an inorganic insulating material. The fifth passivation layer 155 and the third passivation layer 142 and the second passivation layer 140 below the end of the fourth passivation layer 152 in the pixel region P. A drain contact hole 158 exposing the drain electrode 133 is formed by patterning the first protective layer 136. The drain contact hole 158 is substantially positioned in the boundary area BA between the transmission area TA and the reflection area RA.

Next, a plate-shaped pixel electrode 160 is formed on each of the pixel areas P by the transparent conductive material. The pixel electrode 160 is in contact with the drain electrode 133 of the thin film transistor Tr through the drain contact hole 158.

Meanwhile, the fifth protective layer 155 made of an inorganic insulating material is also formed to improve adhesion between the fourth protective layer 152 made of an organic insulating material and the pixel electrode 160 made of a transparent conductive material. The protective layer 155 may be omitted.

In addition, a sixth passivation layer 163 is formed on the pixel electrode 160 using an inorganic insulating material, and a common electrode 170 is formed on the sixth passivation layer 163 using a transparent conductive material. The common electrode 170 may be separately formed for each pixel area P, or as shown in the drawing, extends to an adjacent pixel area P and is formed on the entire display area including the plurality of pixel areas P. FIG. May be In this case, although not shown in the drawing, the common electrode 170 is in contact with the common wiring 109 through a common contact hole (not shown).

The common electrode 170 has a first opening op1 in the transmission area TA and a second opening op2 in the reflection area RA. The first and second openings op1 and op2 have different directions. That is, in the transmissive area TA, the long axis of the transmissive area TA has a first direction and a plurality of first openings op1 are formed to be spaced apart at regular intervals. A plurality of second openings op2 are formed at regular intervals in a long direction in the third direction. The third direction is inclined at an angle smaller than 90 degrees with respect to the first or second direction.

Next, although not shown, a first alignment layer is formed on the common electrode 170 having the plurality of first and second openings op1 and op2.

The color filter substrate is provided corresponding to the array substrate which has the above-mentioned structure.

The color filter substrate includes a second substrate 181 positioned on an upper portion of the first substrate 102, and the inner surface of the second substrate 181 has a boundary of each pixel region P, and more particularly, transmission. The black matrix 183 is formed corresponding to the boundary of the area TA. In addition, a color filter layer 185 is formed on the inner surface of the second substrate 181 to cover the black matrix 183 and include a red, green, and blue color filter pattern that is sequentially repeated corresponding to each pixel region P. FIG. It is. In this case, the color filter layer 185 is patterned and removed corresponding to the central portion of the reflective area RA, so that the color filter layer 185 includes a transmission hole TH. The configuration of the transmission hole TH in the reflection area RA is to improve luminance in the reflection area RA.

An overcoat layer 187 is formed on the entire surface of the second substrate 181 to cover the color filter layer 185 having the transmission hole TH. Although not shown in the drawings, the overcoat layer 187 covers the overcoat layer 187. An alignment film is formed.

In addition, first and second polarizing plates 193 and 195 are attached to outer surfaces of the first and second substrates 102 and 181, respectively, and polarization axes of the first and second polarizing plates 193 and 195 are perpendicular to each other. .

The liquid crystal layer 190 is positioned between the first and second alignment layers (not shown). The liquid crystal layer 190 has a first thickness d4 corresponding to the transmission area TA, and has a second thickness d3 thinner than the first thickness d1 in the reflection area RA. At this time, the second thickness (d3) is characterized in that 1 / 1.7 of the first thickness (4).

In the present invention, in the case of the second alignment film of the color filter substrate, the alignment direction in the transmission area TA and the reflection area RA is matched. Therefore, it is a feature that the second alignment film can be aligned by the photo-alignment method or the rubbing method. The rubbing method can reduce the time compared to the photo-alignment method, can increase productivity, and is superior to the photo-alignment method in the problems such as afterimage. Here, the alignment direction of the second alignment layer forms the first angle A with the second direction.

On the other hand, in the case of the first alignment layer of the array substrate, the alignment direction in the transmission area TA has a second direction and a first angle A, and the alignment direction in the reflection area RA is in the transmission area TA. Has an orientation direction and a second angle (B). Therefore, the first alignment layer is aligned by the photoalignment method using ultraviolet violet ray.

As described above, in the first embodiment of the present invention, in the divided alignment structure in which the arrangement directions of the liquid crystal molecules are different in the reflection area RA and the transmission area TA, the reflection area RA and the transmission area of the color filter substrate are different. The orientation direction in (TA) was matched, and the characteristic of the orientation by rubbing was made possible.

On the other hand, in the present invention, in the direction (up1) of the polarization axis of the second polarizing plate provided on the outer surface of the color filter substrate, the orientation direction in the transmission region and the reflection region of the color filter substrate, and in the transmission region of the array substrate The orientation directions of are all configured to coincide. In other words, the direction of the polarization axis of the second polarizing plate, the direction of orientation of the second alignment layer, and the direction of orientation of the first alignment layer in the transmission region are first in the first direction, that is, in the long axis direction of the first opening op1. An angle A may be formed, and the first angle A may be in a range of about ± 5 degrees to ± 10 degrees.

In addition, the direction dp1 of the polarization axis of the first polarizing plate provided on the outer surface of the array substrate may be configured to intersect the direction up1 of the polarization axis of the second polarizing plate perpendicularly.

The alignment direction in the reflective area RA of the array substrate may form a second angle B with respect to the alignment direction of the second alignment layer, and the second angle B may have a range of ± 62 degrees to ± 64 degrees. . In this case, the long axis direction of the second opening op2 may be disposed to coincide with the alignment direction in the reflection area RA of the array substrate.

For example, if the first angle A is +5 degrees and the second angle B is +63 degrees, the direction of the polarization axis of the second polarizing plate, the color filter substrate and the array substrate in the transmission area TA, The alignment direction and the alignment direction in the reflective area RA of the color filter substrate are disposed at an angle of 5 degrees clockwise with respect to the first opening op1, and the second opening ( op2) and the alignment direction of the reflection area RA in the array substrate may be arranged at an angle of 68 degrees clockwise with respect to the first opening op1.

In the transverse electric field mode reflection-transmissive liquid crystal display device according to the present invention, the liquid crystal molecules in the liquid crystal layer in the reflection area RA are twisted by a second angle B between the array substrate and the color filter substrate. . Therefore, with the configuration twisted by the second angle B of the liquid crystal molecules, the thickness of the liquid crystal layer (d3 in FIG. 3) in the reflection area RA is the thickness of the liquid crystal layer in the transmission area TA (FIG. It can be 1 / 1.7 of d4) of 3. In addition, in the color filter substrate which is the upper plate, since the alignment directions are the same in both the reflection area RA and the transmission area TA, the color filter substrate can be subjected to the photo-alignment method or the rubbing method. Freedom has the advantage of increasing.

In addition, the transverse electric field mode reflection-transmissive liquid crystal display device according to the present invention has a reflection efficiency improved by about 10% and a contrast ratio improved by about 30% as compared with the related art.

As described above, in the transverse electric field mode transmissive type liquid crystal display device having the above-described structure, the optical alignment method or the rubbing method is performed by matching the orientation directions in the reflection area and the transmission area of the color filter substrate. It is characterized by all possible. However, it may be configured to have different orientation directions with respect to the reflective region and the transmissive region of the color filter substrate.

On the other hand, the thickness of the liquid crystal layer in the transmissive region is usually configured to be about 3.8 μm to 4.3 μm. In the conventional case, the thickness of the liquid crystal layer in the reflective region is that of the transmissive liquid crystal layer. Since it should be 1/2 of the thickness, it becomes 1.9 μm to 2.15 μm. However, in the case of the present invention, the thickness of the liquid crystal layer in the reflective region is 2.24 μm to 2.53 μm, which is 1 / 1.7 of the thickness of the transmissive region liquid crystal layer. Therefore, in the transverse electric field mode reflection-transmissive liquid crystal display device according to the present invention, it is possible to prevent the white luminance deterioration due to the inhomogeneity of the director caused by the thickness of the liquid crystal layer becomes thin, and the liquid crystal layer in the liquid crystal layer itself By forming the twist structure, the black luminance deterioration phenomenon can also be prevented.

However, in the transverse electric field mode reflective transmission liquid crystal display device according to the first embodiment of the present invention, in the boundary area BA between the transmission area TA and the reflection area RA, the transmission area TA and the reflection area. The alignment direction of (RA) is different, so that the arrangement state of the liquid crystal molecules becomes nonuniform, which causes disclination. This foreground causes light leakage, and as shown in FIG. 4, light leakage occurs at two places in the pixel region P. As shown in FIG. These light leaks reduce the contrast ratio and degrade the image quality. Therefore, it is desirable to block light leakage using a black matrix.

5 is a plan view of a transverse electric field mode reflective transmission liquid crystal display device according to a first embodiment of the present invention including a black matrix. As illustrated, each pixel area P includes a transmission area TA and a reflection area RA. Here, since the orientation directions of the transmission area TA and the reflection area RA are different, the foreground occurs in the boundary area BA between the transmission area TA and the reflection area RA. In addition, the alignment of the liquid crystal molecules in the boundary area BA is formed of an organic insulating material and is caused by the step of the fourth protective layer 152 for inducing a cell gap difference between the transmission area TA and the reflection area RA. This becomes uneven and the foreground occurs. In order to block light leakage due to the foreground, the black matrix 183 is positioned corresponding to the boundary area BA.

However, since the transmission area TA and the reflection area RA are alternately arranged, one pixel area P includes two boundary areas BA, that is, two foreground generating areas, and a black matrix ( 183 is arranged to shield the foreground generating area. In practice, the black matrix 183 has a structure surrounding the transmission area TA.

As the area of the black matrix 183 becomes wider, the opening area for displaying an image is reduced, and transmission and reflectance are reduced.

In addition, as the foreground generating area increases, the alignment stability of the liquid crystal decreases, which may appear as a problem such as a touch problem caused by an external force and a decrease in response speed characteristics.

Therefore, the second embodiment of the present invention proposes a structure capable of minimizing the foreground generating area to improve the aperture ratio and to secure the orientation stability.

6 is a plan view of a transverse electric field mode reflective transmission type liquid crystal display device according to a second embodiment of the present invention including a black matrix. In FIG. 6, each of the pixel areas P1 and P2 has a structure similar to that shown in FIG. 2, and descriptions of the same parts will be omitted.

As shown, a plurality of gate lines 203 and a plurality of data lines 225 intersect to define a plurality of pixel regions P1 and P2, and each gate line 203 is formed of pixel regions P1 and P2. Go through each middle.

The thin film transistor Tr is positioned at the intersection of the gate line 203 and the data line 225, and a pixel electrode 260 is formed in each of the pixel regions P1 and P2 to be connected to the thin film transistor Tr. have.

In more detail, the first pixel region P1 and the second pixel region P2 are alternately arranged along the vertical direction, and the first pixel region P1 is the first reflection region RA1 and the first transmission region. (TA1), and the second pixel area P2 includes a second reflection area RA2 and a second transmission area TA2.

In addition, a common wiring 209 is formed in parallel with the gate wiring 203 between the first reflective region RA1 of the first pixel region P1 and the second reflective region RA2 of the second pixel region P2. It is. The common wiring 209 may be omitted.

Here, the second transmission area TA2 is adjacent to the first transmission area TA1, and the second reflection area RA2 is adjacent to the next first reflection area RA1. Therefore, the first reflection area RA1, the first transmission area TA1, the second transmission area TA2, the second reflection area RA2, the first reflection area RA1, the first transmission area TA1, The second transmission area TA2 and the second reflection area RA2 are sequentially arranged.

Meanwhile, the first and second pixel areas P1 and P2 include a boundary area BA between each of the reflection areas RA1 and RA2 and the transmission areas TA1 and TA2. The reflection areas RA1 and RA2 and the transmission areas TA1 and TA2 have different orientation directions, and the black matrix 283 corresponds to the boundary area BA to block light leakage in the boundary area BA. Located. In more detail, the black matrix 283 has a structure surrounding the first transmission area TA1 and the second transmission area TA2.

As described above, in the second exemplary embodiment of the present invention, the reflection areas RA1 and RA2 of the adjacent pixel areas P1 and P2 are adjacent to each other or the transmission areas TA1 and TA2 are arranged to be adjacent to each other, thereby providing each pixel area P1 and P2. ) Includes one boundary area BA, that is, one foreground generating area. In addition, the foreground generation region is positioned to correspond to the gate wiring 203. Therefore, the area of the black matrix 283 can be minimized, the aperture ratio can be improved, and the stability of the orientation can be ensured.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit of the present invention.

1 is a schematic cross-sectional view of a conventional transverse electric field mode reflection-transmissive liquid crystal display device.

FIG. 2 is a plan view of one pixel area of a transverse electric field mode reflective transmissive liquid crystal display according to a first embodiment of the present invention.

3 is a cross-sectional view of a portion cut along the cutting line III-III of FIG.

FIG. 4 is a diagram illustrating light leakage appearing in one pixel area of a transverse electric field mode reflective transmission liquid crystal display according to a first embodiment of the present invention.

5 is a plan view of a transverse electric field mode reflective transmission liquid crystal display device according to a first embodiment of the present invention including a black matrix.

6 is a plan view of a transverse electric field mode reflective transmission type liquid crystal display device according to a second embodiment of the present invention including a black matrix.

Claims (10)

A first substrate; A plurality of gate wires formed in a first direction on the first substrate; A plurality of data lines formed in a second direction on the first substrate and defining a plurality of pixel areas each of which includes a reflection area and a transmission area to cross the gate line; A thin film transistor formed in each of the plurality of pixel regions and connected to the gate line and the data line; A first protective layer covering the data line and the thin film transistor; A reflection plate formed in the reflection area on the first passivation layer; A second protective layer on the reflective plate; A pixel electrode formed in each of the plurality of pixel areas on the second passivation layer and connected to the thin film transistor; A third passivation layer on the pixel electrode; And A common electrode formed on the third passivation layer and including a plurality of first openings in the first direction in the transmission area and a plurality of second openings in a third direction in the reflection area; Including; The plurality of pixel areas may include a first pixel area and a second pixel area that are alternately arranged along the second direction, and the transmission area of the first pixel area is adjacent to the transmission area of the second pixel area. The reflective liquid crystal display of claim 1, wherein the reflective region of the first pixel region is adjacent to the reflective region of the second pixel region. The method according to claim 1, A second substrate spaced apart from the first substrate; A black matrix formed on an inner surface of the second substrate and corresponding to a boundary area between the reflective area and the transmission area of each of the plurality of pixel areas; A color filter layer formed on an inner surface of the second substrate and corresponding to the plurality of pixel areas; And Liquid crystal layer interposed between the first and second substrate Reflective transmissive liquid crystal display device further comprising. The method according to claim 2, The liquid crystal display device of claim 1, wherein the liquid crystal molecules positioned in the reflection area have a different arrangement direction than the liquid crystal molecules located in the transmission area. The method according to claim 2, And the boundary area corresponds to the gate wiring. The method according to claim 2, And the black matrix surrounds the transmission area of the first pixel area and the transmission area of the second pixel area. The method according to claim 2, And the thickness of the liquid crystal layer in the reflective region is 1 / 1.7 of the thickness of the liquid crystal layer in the transmissive region. The method according to claim 2, The color filter layer has a transmissive hole corresponding to a central portion of the reflective area. The method according to claim 1, And the first passivation layer is made of an organic insulating material, and the first passivation layer and the reflecting plate of the reflecting region have a concave-convex surface. The method according to claim 8, A fourth protective layer made of an inorganic insulating material between the thin film transistor and the first protective layer; And A fifth protective layer made of an inorganic insulating material between the first protective layer and the reflecting plate Reflective transmissive liquid crystal display device further comprising. The method according to claim 9, And a sixth passivation layer made of an organic insulating material between the second passivation layer and the third passivation layer in the reflective region.

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