KR101656486B1 - Transflective type liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device which overcomes the problem of occurrence of a patterning error due to a large area during manufacture, and has a structure in which a cell gap between a reflective region and a transmissive region is made constant, To a reflective transmissive liquid crystal display device.

The present invention provides a reflection substrate having a phase compensation pattern and a reflection pattern on the outside of a liquid crystal panel to prevent defects that may occur in forming an insulator film for phase compensation on the inner surface of a color filter substrate or an array substrate, .

By providing the reflective portion and the transmissive portion in at least one pixel region unit without providing the reflective portion and the transmissive portion in one pixel region, the enlargement of the error range due to the enlargement can be minimized and the patterning defect rate can be minimized.

In addition, since a reflective pattern is not formed in the array substrate, the same structure as that of a general array substrate for a transmissive liquid crystal display can be achieved and the same process as that of a transmissive array substrate can be performed. Line can be used.

Reflective transmission type, liquid crystal display device, reflective substrate, reflection pattern, phase difference

Description

[0001] The present invention relates to a transflective type liquid crystal display device,

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device which overcomes the problem of occurrence of a patterning error due to a large area during manufacture, and has a structure in which a cell gap between a reflective region and a transmissive region is made constant, To a reflective transmissive liquid crystal display device.

In general, a liquid crystal display device is a display device using the characteristics of liquid crystal molecules having different arrangements according to voltage application, and can be driven at a lower power than a cathode ray tube, and is advantageous in downsizing and thinning. Therefore, And is used as a display device of a notebook computer, a personal portable terminal, or the like because it is easy to carry because of its lightweight and thin characteristics.

In such a liquid crystal display device, two substrates on which electrodes are formed are arranged so that the two electrodes are opposed to each other, and an electric field generated by a voltage difference between the two substrates through the liquid crystal, By controlling the movement of molecules, the transmittance of light varies according to the intensity of light.

On the other hand, a liquid crystal display device is generally a passive device that does not emit light by itself, so a separate light source is required. Therefore, in addition to a liquid crystal panel composed of the two substrates and the liquid crystal layer, a backlight for supplying light to the backside of the liquid crystal panel is disposed, and light emitted from the backlight is incident on the liquid crystal panel. The image is displayed by adjusting the amount.

Such a liquid crystal display device is referred to as a transmission type liquid crystal display device. Since a transmissive 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. However, A relatively large power consumption is a drawback.

Therefore, in order to overcome such disadvantages, a reflection type liquid crystal display device using an external light source without using a backlight has been proposed.

Since the reflection type liquid crystal display device operates using external natural light or artificial light, since the amount of power consumed by the backlight is greatly reduced, the power consumption is relatively smaller than that of the transmissive type and can be used in a portable state for a long time, And a display device of a portable device such as an assistant.

However, such a reflection type liquid crystal display device has a low power consumption because it does not have a separate light source, but it has a disadvantage that it can not be used in a place where external light is weak or absent.

Therefore, recently, a transflective type liquid crystal display device has been proposed in which only the merits of a reflective liquid crystal display device and a transmissive liquid crystal display device are accepted.

FIG. 1 is a schematic plan view of a conventional reflective transmissive liquid crystal display device, and FIG. 2 is a simplified plan view of one pixel region of a conventional reflective transmissive liquid crystal display device, and FIG. 3 is a cross- And FIG.

As shown in the drawing, the conventional transflective liquid crystal display device 1 has a color filter layer 26 including color filter patterns 26a, 26b and 26c on the inner side thereof, A color filter substrate 20 on which a transparent common electrode 28 is laminated and a plurality of gate and data lines 44 which define a plurality of pixel regions P intersecting with each other A reflecting electrode 47 (or a reflective electrode) and a pixel electrode 48 formed by dividing each pixel region P into a reflective portion RA and a transmissive portion TA and a thin film transistor Tr and a liquid crystal layer 70 interposed between these two substrates 20,

The first and second polarizers 61 and 62 are disposed on the outer surfaces of the color filter substrate 20 and the array substrate 40 so as to have vertical polarization axes. A plurality of compensation films (not shown) are formed between the first polarizing plates 61. A backlight unit (not shown) serving as a light source for the transmissive portion TA is formed below the second polarizer 62 attached to the outer surface of the array substrate 40.

In one pixel region P, one pixel region P is divided into a transmissive portion TA and a reflective portion RA. A first passivation layer 51 is formed on the entire surface of each pixel region P so as to cover the thin film transistor Tr and a first passivation layer 51 formed on the reflective portion RA to cover the thin film transistor Tr 51, the reflective plate 47 is formed on the second protective layer 52 having a relatively thick thickness. The pixel electrode 48 is in contact with a drain electrode (not shown) of the thin film transistor Tr and the reflective layer RA corresponds to the reflective layer RA, 47 and is formed on the first passivation layer 51 corresponding to the transmissive portion RA in a state where the second passivation layer 52 is removed. The height difference of the reflective plate 47 and the pixel electrode 48 with respect to the surface of the array substrate 40 is controlled by the second protective layer 52, And a dual cell gap structure in which the thickness of the liquid crystal layer 70 corresponding to the transmissive portion TA is different.

The reflective transmissive liquid crystal display device having the above-described configuration is mainly implemented in an electrically controlled birefringence (ECB) mode or a VA (vertical alignment) mode. The ECB mode has a disadvantage in that the viewing angle is low. In order to improve the viewing angle, a plurality of viewing angle compensating films have to be additionally constructed. Therefore, there arises a problem of an increase in manufacturing cost, and a multi-domain is required to be implemented within one pixel region.

On the other hand, in the case of a liquid crystal display device, due to its light and thin structural features, it has recently been used as a mass medium such as a TV, since it is separated from a personal display device such as a portable notebook computer so that a large number of users can watch The viewing angle becomes an important issue.

Therefore, in order to overcome the disadvantage that the viewing angle of the VA mode and the ECB mode liquid crystal display device are low, the common electrode and the pixel electrode are formed on the same substrate and driven by a transverse electric field to improve the viewing angle range. .

However, when the transverse electric field mode is applied to such a transflective liquid crystal display device, the light incident from the outside passes through the liquid crystal layer twice and passes through the transmissive portion once, so that a phase difference occurs in the reflective portion and the transmissive portion So that the display quality is degraded.

In order to solve this problem, a method of forming a dual cell gap having a different cell gap between a reflective portion and a transmissive portion, such as a general TN mode reflective transmission type liquid crystal display device, has been proposed. However, There arises a problem that the manufacturing process becomes complicated relative to each other and that a short defective due to the intervention of the metallic foreign matter arises due to the relatively thin cell gap in the reflecting portion.

4, which is a cross-sectional view for one pixel region of a transflective liquid crystal display device in which a conventional in-cell film is formed on a color filter substrate, is shown in Fig. 3 (for the same components as the liquid crystal display device shown in Fig. 3 The insulator film for retardation compensation corresponding to the reflection portion RA in each pixel region P is formed on the inner surface of the array substrate 40 or the color filter substrate 20 as shown in Fig. The insulator film 31 for the phase difference compensation may be formed on the constituent elements in the array substrate 40 or the respective elements in the color filter substrate 20 together with the constituent elements in the color filter substrate 20, The formation on the inner surface is particularly effective in the case of reflecting a larger size of a display device in recent years, a relatively large error such as a unit processing apparatus for manufacturing the same, Or is a difficult state to process ever by shrinkage.

For example, when the inlicle film 31 is formed on the inner surface of the color filter substrate 20, the inlens film 31 may be formed in an undesired region by the deformation of the color filter layer 26 located below the inlens film 31, Since the error range is increased up to the region corresponding to the transmissive portion TA, light transmitted through the transmissive portion TA is also generated in the transmissive portion TA, and the retardation in the reflective portion RA and the transmissive portion TA There is a problem in that the ability to perform the role of compensating for the loss is reduced.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method and apparatus for forming a single cell gap without forming a double cell gap, It is an object of the present invention to provide a transmissive liquid crystal display device.

A reflective transmissive liquid crystal display device according to the present invention includes a plurality of gate and data lines formed by defining a plurality of pixel regions intersecting with each other, a plurality of common lines formed in parallel with the plurality of gate lines, A thin film transistor formed in each of the pixel regions, a plurality of pixel electrodes connected to the drain electrodes of the thin film transistors and spaced apart from each other by a predetermined distance, a plurality of pixel electrodes connected to the common wiring, And a plurality of common electrodes formed alternately and in parallel with the pixel electrodes of the array substrate; A black matrix formed on the surface facing the array substrate and corresponding to the plurality of gates, the data lines, and the thin film transistors, and a black matrix formed in correspondence to the pixel regions in order of red, A color filter substrate including a color filter layer; A liquid crystal layer interposed between the plurality of pixel electrodes and the color filter layer; A reflection pattern and a phase compensation pattern are sequentially formed corresponding to the entire area of the pixel region of the plurality of pixel regions of the array substrate facing the outer surface of the array substrate, A reflective substrate adhered to the outer surface of the array substrate by an adhesive layer provided on the reflective substrate; A first polarizer provided on an outer surface of the color filter substrate; And a second polarizer provided on an outer surface of the reflective substrate, wherein each of the plurality of pixel regions includes one of the pixel regions as the reflective portion or the transmissive portion.

The reflective portion and the transmissive portion each have one pixel region as a reference, and the reflective portion and the transmissive portion are defined to alternate with each other. Thus, a portion where the reflective pattern is formed in one pixel region size unit and a non- And is arranged to be alternately arranged.

The reflective portion and the transmissive portion are defined as a group in which 3n (n is a natural number) consecutive pixel regions are defined as one group, and the reflective portion and the transmissive portion alternate with each other in the group unit, (N is a natural number) pixel regions are arranged in such a way that the same number of red, green, and blue pixels are arranged in a group of 3n , And a blue color filter pattern.

The reflective portion and the transmissive portion are defined to alternate in a line unit, and a plurality of pixel regions connected to the odd-numbered gate wirings constitute a reflection portion, and a plurality of pixel regions connected to the even-numbered gate wirings constitute a transmissive portion or connected to odd- And a plurality of pixel regions connected to the even-numbered data lines form a transmissive portion so that the reflective pattern provided on the reflective substrate has a striped shape and is spaced apart in the longitudinal direction by a major axis width of the pixel region Or arranged in the transverse direction by a short axis width of the pixel region.

And the liquid crystal layer has the same thickness in the pixel region corresponding to the reflective portion and the pixel region corresponding to the transmissive portion.

The data line and the plurality of pixel electrodes and the common electrode have a structure in which the center of each pixel region is symmetrically bent, thereby forming a multi-domain within one pixel region.

The first polarizer is characterized in that it is treated with ARC (Anti Reflection Coating) or ARS (Anti Reflection Sputtering).

And an ARS (Anti Reflection Sputtering) glass substrate is further attached to the outer surface of the first polarizer plate.

The adhesive layer is colorless and transparent and has a refractive index of 1.4 to 1.6.

The present invention provides a reflection substrate having a phase compensation pattern and a reflection pattern on the outside of a liquid crystal panel to prevent defects that may occur in forming an insulator film for phase compensation on the inner surface of a color filter substrate or an array substrate, .

By providing the reflective portion and the transmissive portion in at least one pixel region unit without providing the reflective portion and the transmissive portion in one pixel region, it is possible to minimize the enlargement of the error range due to the enlargement of the pixel region and minimize the defective patterning rate.

Since the reflective pattern is not formed in the array substrate, it has the same structure as the general array substrate for the transmissive liquid crystal display device. Therefore, the same process as that of the transmissive array substrate can be performed, so that the same process line as the fabrication of the transmissive array substrate can be used without changing process conditions and steps.

Hereinafter, a reflective transmissive liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

5 is a plan view schematically showing a part of a display area for displaying an image of a transflective liquid crystal display device according to the present invention.

5, the reflective transmissive liquid crystal display device 101 according to the present invention differs from the conventional one in that a reflective portion RA and a transmissive portion TA are not formed in one pixel region P, The transmissive portion TA or the reflective portion RA. In the drawing, three pixel regions P each having the red, green, and blue color filter patterns R, G, and B successively form one group gr1 and gr2, It is seen that the groups gr1 and gr2 alternate up and down and right and left to form a reflection portion RA and a transmission portion TA. In this case, each of the groups (gr1, gr2) is not necessarily composed of only three neighboring pixel regions P, but 6 neighbors or 9 neighbors, that is, 3n neighbors May be formed as one group so that the neighboring group alternates with the reflective portion RA and the transmissive portion TA. In this case, it is preferable that the number of red, green, and blue color filter patterns (R, G, B) in the respective groups (gr1, gr2) For example, when six neighboring pixel regions are formed as one group, two pixel regions representing red, green and blue colors are preferably provided in each group.

6A to 6C are diagrams showing various examples of a display region of a transflective liquid crystal display device as a modification of the present invention.

6A and 6B, the transmissive portion TA and the reflective portion RA are formed in a line unit. 6A, assuming that n gate wirings (not shown) extending in the horizontal direction sequentially from the uppermost side to the lower side of the display region are formed, a plurality of pixels (not shown) connected to odd- The region P is a transmissive portion TA and the plurality of pixel regions P connected to an even gate wiring line (not shown) constitute a reflective portion RA. That is, a reflection pattern 178 having a stripe shape extending in the horizontal direction (the extending direction of the gate wiring) is formed so as to be spaced apart from the pixel region P by the long axis width in the vertical direction to be.

6B, assuming that n data lines (not shown) extending in the longitudinal direction from the leftmost side to the right side of the display area are formed, a plurality of pixel regions (not shown) connected to odd-numbered data lines P each constitute a transmissive portion TA and a plurality of pixel regions P connected to even data lines (not shown) constitute a reflective portion RA. That is, a reflection pattern 178 having a stripe shape extending in the longitudinal direction (the extending direction of the data line) is formed in the lateral direction (extending direction of the gate wiring) by a short axis width of the pixel region P to be.

6A and 6B, it is obvious that the reflective portion RA and the transmissive portion TA may be formed by changing their positions.

In Fig. 6C, it is shown that two neighboring pixel regions P form a transmissive portion TA and a reflective portion RA, respectively.

7, which is a plan view showing the inner planar structure of two pixel regions P constituting the reflective portion and the transmissive portion in the reflective transmissive liquid crystal display device according to the present invention, A gate line 108 and a data line 125 are formed and spaced apart from the gate line 108 and a common line 113 is formed .

A thin film transistor Tr which is connected to the two wirings 108 and 125 and is a switching element is formed near the intersection of the gate wiring 108 and the data wiring 125. The thin film transistor Tr includes a gate electrode 110, a gate insulating layer (not shown), a semiconductor layer 120 composed of an active layer (not shown) and an ohmic contact layer (not shown) And drain electrodes (128, 130).

The connection electrode 140 is formed in the pixel region P in contact with the drain electrode 130 through the drain contact hole 135. The connection electrode 140 is branched from the connection electrode 140, The pixel electrode 143 is formed. The common electrode 113 is in contact with the common line 113 through the common contact hole 137 and is connected to one end of the common line 113. The common electrode 146 is alternately spaced apart from the plurality of pixel electrodes 143, have. At this time, the connection electrode 140 overlaps with the common wiring 113, and the overlapped portion forms a storage capacitor StgC.

In the drawing, the data line 125, the plurality of pixel electrodes 143 and the common electrode 146 formed in parallel with each other in order to implement a multi-domain for preventing a color shift phenomenon in one pixel region P In this case, the data lines 125 and the plurality of pixel electrodes 143 may be formed in a multi-domain structure. In this case, And the common electrode 146 do not have a bent structure but are in the form of a straight line or a bar.

A reflection pattern 178 for reflecting light and a retardation compensation pattern (not shown) are further provided on the entire surface of all the pixel regions P constituting the reflection portion RA in the pixel region P in addition to the above- . This configuration will be described in more detail through a sectional configuration.

Hereinafter, the cross-sectional structure of the transflective liquid crystal display device having the above-described plane structure will be described.

FIG. 8 is a cross-sectional view of a portion taken along line VIII-VIII of FIG. 7; FIG. Here, for convenience of description, a region where the thin film transistor is formed in each pixel region is defined as a switching region TrA.

The reflective transmissive liquid crystal display device 101 according to the present invention includes a color filter substrate 155 and an array substrate 105 and a liquid crystal panel 170 including a liquid crystal layer 170 interposed between the two substrates 155 and 105 And a phase compensation pattern 182 provided on the outer surface of the array substrate 105 of the liquid crystal panel 195 to reflect the reflection pattern 178 and the? / 4 phase change corresponding to the reflection part RA. First and second polarizing plates 190 and 193 respectively formed on the outer surfaces of the color filter substrate 155 and the reflective substrate 175 and the second polarizing plate 193 And a backlight unit (not shown) at a lower portion thereof. At this time, the first polarizer 190 performs an anti-reflection coating (ARC) or anti reflection sputtering (ARS) process so that light incident on the first polarizer 190 is incident on the liquid crystal panel in an amount of more than 95% Or an ARS glass substrate (not shown) is formed on the outer surface of the first polarizing plate 190 when the first polarizing plate 190 is not subjected to ARC or ARS processing. The first polarizing plate 190 having the ARC or ARS-treated first polarizing plate 190 or the ARS glass substrate (not shown) is designed to receive the external light more effectively in the reflective mode to improve the brightness.

In the liquid crystal panel 195, a gate wiring (not shown) is formed on a transparent insulating substrate 105 forming a base, and the gate wiring (not shown) The common wiring 113 is formed. The switching region TrA is connected to the gate wiring (not shown) and has a gate electrode 110 formed thereon. A gate insulating film 116 is formed on the gate wiring 110 and the common wiring 113. The gate insulating film 116 is sequentially formed on the gate insulating film 116 in correspondence to the gate electrode 110, The semiconductor layer 120 including the active layer 120a and the ohmic contact layer 120b spaced apart from the impurity amorphous silicon is formed.

A data line 125 is formed on the gate insulating layer 116 to define the pixel regions P so as to intersect the gate lines (not shown). The data lines 125 are spaced apart from each other on the ohmic contact layer 120b Source and drain electrodes 128 and 130 are formed. The source electrode 128 is connected to the data line 125 and the gate electrode 110, the gate insulating layer 116, and the semiconductor layer 120, which are sequentially stacked in the switching region TrA, The source and drain electrodes 128 and 130 form a thin film transistor Tr.

A protective layer 133 is formed on the data line 125 and the thin film transistor Tr so that the drain electrode 130 of the thin film transistor Tr is exposed. And a common contact hole (not shown) for exposing the contact hole 135 and the common wiring 113 are provided.

The connection electrode 140 is formed on the passivation layer 133 in contact with the drain electrode 130 through the drain contact hole 135 as a metallic material or a transparent conductive material. And a plurality of pixel electrodes 143 are spaced apart from each other by a predetermined distance and are connected to the common wiring 113 through the common contact hole And are formed alternately and in parallel with the plurality of pixel electrodes 143.

In the color filter substrate 155 facing the array substrate 105 having the structure described above, the black matrix 158 is formed on the boundary of each pixel region P and the thin film transistor Tr on the inner surface thereof A color filter layer 160 including red, green and blue color filter patterns 160a (not shown) and 160c is sequentially formed for each pixel region P with respect to an opening surrounded by the black matrix 158 And an overcoat layer 165 is formed under the color filter layer 160 in a flat state. At this time, the overcoat layer 165 may be omitted.

A liquid crystal layer 170 having the same thickness is interposed between the array substrate 105 and the color filter substrate 155 irrespective of the transmissive portion TA and the reflective portion RA.

A reflective substrate 175 including a reflective pattern 178 and a phase compensation pattern 182 is formed on an outer surface of the array substrate 105. The reflection plate 175 is provided with a reflection pattern 178 corresponding to each pixel region P constituting a reflection portion RA provided in the array substrate 105 on a transparent insulating substrate 175 as a base And a phase compensation pattern 182 is formed on the reflection pattern 178 to develop a phase change of? / 4. The array substrate 105 and the reflective substrate 175 are closely fixed to each other via an adhesive layer 185. The adhesive layer 185 is colorless and transparent and has a refractive index of 1.4 to 1.6 And the like. This is because, among the constituent elements of the liquid crystal panel, all the materials constituting the liquid crystal layer and the insulating layer generally have a refractive index of about 1.4 to 1.6, so that the total reflection due to the difference in refractive index is generated in a similar level, .

 The reflective pattern 178 formed on the reflective substrate 175 is formed corresponding to the pixel region P corresponding to the reflective portion RA of the pixel region P shown in FIGS. 5 and 6A to 6C . Therefore, the reflective substrate 175 is formed as a portion where the reflection pattern 178 is formed and a portion where the reflection pattern 178 is not formed. The planar shape of the reflective substrate 175 may be a chess plate structure (see FIGS. 5 and 6C) (See FIGS. 6A and 6B) in which the stripe patterns are spaced apart from each other by a predetermined distance.

The reflective substrate 175 having the above-described configuration is formed with a reflective pattern 178 made of a metal material having excellent reflection efficiency, for example, aluminum (Al) or aluminum alloy (AlNd) on a transparent insulating substrate 175 having a flat surface. And the phase compensation pattern 182 is formed on the reflection pattern 178. The phase compensation pattern 182 can be formed within an error range that is much smaller than an error range in forming the inlens film on the conventional array substrate or the color filter substrate. That is, when the inlens film for phase difference compensation is formed on the array substrate as in the prior art, the incidence film forming region is relatively small compared to the present invention, the step difference of the lower component is relatively large, , The color filter layer and the black matrix formed on the color filter substrate are organic materials, so that the contraction / expansion is relatively severe during the process, which may result in poor patterning. However, in the case of the present invention, since the reflection pattern 178, which is a single pattern, is formed, and the phase compensation pattern 182 is formed on the reflection pattern 178 without any shrinkage / The occurrence rate of defects due to the level difference becomes very small. Therefore, even if the error range is enlarged due to the large size, the error range to be increased as compared with the conventional case becomes relatively small.

In addition, in the related art, if both the reflective portion and the transmissive portion are formed in one pixel region, the size of the reflective portion is small, and if the process of forming a pattern in this region is progressed, an increase in error range caused by large- However, in the case of the present invention, since the reflection portion RA has a size of at least one pixel region P, it is possible to overcome the problem of the pattern defect due to the increase of the error range due to the large- .

     On the outer surface of the color filter substrate 155 of the liquid crystal panel 195 having the above-described structure, a first polarizer 190 having a first polarization axis is provided. On the outer surface of the reflector plate 175, A second polarizing plate 193 having a second polarizing axis perpendicular to the first polarizing axis of the first polarizing plate 190 is provided. Although not shown in the drawing, a backlight unit (not shown) is provided on the outer surface of the second polarizer 193.

Hereinafter, a method of manufacturing a transflective liquid crystal display device according to the present invention having the above-described configuration will be briefly described with reference to FIGS. 7 and 8. FIG.

First, a black matrix 158 is formed on a transparent insulating substrate 155 according to a general method of manufacturing a color filter substrate, and red, green, and blue are sequentially applied to the pixel regions P surrounded by the black matrix 158, A color filter layer 160 is formed so as to correspond to the blue color filter patterns 160a to 160c and an overcoat layer 165 is formed over the color filter layer to complete the color filter substrate 155. [

Next, a gate wiring 108 extending in one direction is formed by depositing a metal material on a transparent insulating substrate 105 according to a general method of manufacturing a lateral electric field type array substrate and patterning the same, and a common wiring 113, And the gate electrode 110 connected to the gate wiring 108 is formed in the switching region TrA in each pixel region P. Then, a gate insulating layer 116 is formed on the entire surface of the gate wiring 108, the gate electrode 110, and the common wiring 113.

A data line 125 is formed on the gate insulating layer 116 to intersect the gate line 108 to define a pixel region P and an active layer 120a and an ohmic The thin film transistor Tr is completed by forming the semiconductor layer 120 formed of the contact layer 120b and the source and drain electrodes 128 and 130 spaced apart from each other on the semiconductor layer 120. [

Next, a protective layer 133 having drain contact holes 135 exposing the drain electrodes 130 over the entire surface of the thin film transistors Tr, and common contact holes 137 exposing the common interconnections 113, A connection electrode 140 which contacts the drain electrode 130 through the drain contact hole 135 on the protection layer 133 and a plurality of spaced apart The pixel electrodes 143 are formed and a plurality of common electrodes 146 which are in contact with the common wiring 113 through the common contact holes 137 and alternate with the plurality of pixel electrodes 143 are formed The array substrate 105 is completed. In this case, the protective layer 133 may be formed so as to have the same thickness without distinguishing the pixel region P constituting the reflective portion RA and the transmissive portion TA, that is, to form a general transmissive transverse electric field type liquid crystal display array substrate . This is because it is not necessary to realize a dual cell gap which differs in the cell gap between the reflective portion RA and the transmissive portion TA due to the characteristics of the present invention.

Thereafter, the color filter substrate 155 and the array substrate 105 are formed so that the color filter layer 160 and the pixel electrode 143 face each other and a seal pattern (not shown) is formed outside the display region, (Not shown) in the state of interposing the liquid crystal layer 170 in correspondence with the display area, thereby completing the liquid crystal panel 195.

Next, a metal material such as aluminum (Al) or aluminum alloy (AlNd) having excellent transmittance is deposited on a new transparent insulating substrate 175 and patterned to form a chess plate structure 4 and FIG. 5C), or a reflection pattern 178 having a shape in which a stripe pattern in the horizontal direction or the vertical direction is spaced apart by a predetermined distance is formed. Then, a phase compensation pattern 182 having the same planar shape corresponding to each reflection pattern 178 is formed on the reflection pattern 178. The reflective substrate 175 is completed by forming an adhesive layer 185 on the phase compensation pattern 182 by applying an adhesive material having transparency to the entire surface and a refractive index of 1.4 to 1.6 and having an adhesive property.

The adhesive layer 185 is disposed on the array substrate 105 so as to face the outer surface of the array substrate 105 of the liquid crystal panel 195 and the adhesive layer 185 of the reflective substrate 175, And the liquid crystal panel 197 is completed.

Next, a first polarizing plate 190 having a first polarization axis is attached to the outer surface of the color filter substrate 155 of the transflective liquid crystal panel 197 having the reflective substrate 175, and the reflective substrate 175 The second polarizing plate 193 is attached to the outer surface of the first polarizing plate 190 so that the second polarizing axis is perpendicular to the first polarizing axis of the first polarizing plate 190. As a result, the transmissive liquid crystal display device 101 according to the present invention is completed. At this time, the surface of the first polarizer 190 is ARS or ARC-treated.

If the first polarizing plate 190 is a general polarizing plate not subjected to ARS or ARC processing, an adhesive layer (not shown) may be interposed between the first polarizing plate 190 and the glass substrate (not shown) Thereby completing a transflective liquid crystal display device according to a modification of the present invention.

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.

For example, the present invention can be applied to a vertical electric field mode liquid crystal display in which a plate-shaped pixel electrode is formed in each pixel region of an array substrate, a color filter layer is covered with a color filter substrate, and a common electrode is formed on the entire surface. Also in this case, the reflective substrate having the reflection pattern and the phase compensation pattern having various shapes on the outer surface of the array substrate of the vertical electric field mode liquid crystal panel is tightly fixed to the outer surface of the color filter substrate and the reflective substrate, The liquid crystal display device of the vertical electric field mode transreflective type may be formed by attaching the first and second polarizing plates to the liquid crystal display device. In this case, the phase compensation pattern formed on the reflective substrate is formed to perform a phase change of? / 4 or a phase change of? / 2.

1 is a schematic view of a conventional transflective liquid crystal display device.

Fig. 2 is a simplified plan view of one pixel region of a conventional transflective liquid crystal display; Fig.

Fig. 3 is a cross-sectional view of a portion cut along the cutting line III-III of Fig. 2; Fig.

4 is a cross-sectional view of one pixel region of a transflective liquid crystal display device in which a conventional in-cell film is formed on a color filter substrate.

5 is a plan view schematically showing a part of a display region for displaying an image of a transflective liquid crystal display device according to the present invention.

6A to 6C are plan views showing various examples of a display region of a transflective liquid crystal display device according to a modification of the present invention.

FIG. 7 is a plan view showing an internal planar structure of two pixel regions constituting a reflective portion and a transmissive portion, respectively, in a transflective liquid crystal display device according to the present invention. FIG.

8 is a cross-sectional view of a portion cut along line VIII-VIII of FIG. 7;

Description of the Related Art

101: transflective liquid crystal display device 105: array substrate

110: gate electrode 113: common wiring

116: gate insulating film 120a: active layer

120b: ohmic contact layer 120: semiconductor layer

125: data line 128: source electrode

130: drain electrode 133: protective layer

135: drain contact hole 140: connection electrode

143: pixel electrode 146: common electrode

155: Color filter substrate 158: Black matrix

160a and 160c: red and blue color filter patterns

160: Color filter layer 165: Overcoat layer

170: liquid crystal layer 175: reflective substrate

178: reflection pattern 182: phase compensation pattern

185: adhesive layer 190: first polarizer plate

193: second polarizer 195: liquid crystal panel

197: Transflective liquid crystal panel

P: pixel region RA: reflection portion

StgC: storage capacitor TA:

Tr: thin film transistor

Claims (10)

A first substrate on which a plurality of pixel regions including a transmissive pixel region and a reflective pixel region are defined; A thin film transistor, a pixel electrode, and a common electrode positioned on each of the plurality of pixel regions on the first substrate; A second substrate facing the first substrate; A color filter layer disposed on the second substrate; A liquid crystal layer disposed between the first and second electrodes; And a reflective pattern and a phase compensation pattern sequentially stacked in correspondence with the reflective pixel region except for the transmissive pixel region and facing the outer surface of the first substrate, A reflective substrate attached to an outer surface of the first substrate by a reflective film; A first polarizer provided on an outer surface of the second substrate; And a second polarizing plate provided on an outer surface of the reflective substrate, And a reflective liquid crystal layer. The method according to claim 1, Wherein the reflective pixel region and the transmissive pixel region are alternately arranged such that a portion of the reflective substrate in which the reflection pattern is formed in one pixel region size unit and a portion in which the reflective pattern is formed are alternately arranged, Device. The method according to claim 1, Wherein the reflective pixel region and the transmissive pixel region are defined such that the 3n (n is a natural number) number of consecutive pixel regions are alternated with each other in the group unit so that the reflective pattern is divided into 3n pixel regions Wherein a portion formed in a size unit and a portion formed in a size unit are alternately arranged. The method of claim 3, Wherein the same number of red, green, and blue color filter patterns correspond to one group of 3n (n is a natural number) pixel regions. The method according to claim 1, The reflective pixel region and the transmissive pixel region are defined so as to alternate on a line basis, and a plurality of pixel regions connected to the odd-numbered gate wirings define the reflective pixel region, and a plurality of pixel regions connected to the even- Or a plurality of pixel regions connected to odd-numbered data lines constitute the reflective pixel region, and a plurality of pixel regions connected to even-numbered data lines constitute the transmissive pixel region, Wherein the reflective pattern provided on the reflective substrate has a stripe shape and is arranged to be spaced apart by a major axis width of the pixel region in the longitudinal direction or spaced apart from the transverse direction by a minor axis width of the pixel region, Display device. The method according to claim 1, And the liquid crystal layer has the same thickness in the reflective pixel region and the transmissive pixel region. The method according to claim 1, Further comprising a gate line and a data line crossing each other on the first substrate to define the plurality of pixel regions, Wherein the data line, the pixel electrode, and the common electrode have a structure in which the center of each pixel region is symmetrically folded to form a multi-domain within one pixel region. The method according to claim 1, Wherein the first polarizer is made of ARC (Anti Reflection Coating) or ARS (Anti Reflection Sputtering). The method according to claim 1, And an ARS (Anti Reflection Sputtering) glass substrate is further attached to the outer surface of the first polarizer. The method according to claim 1, Wherein the pressure-sensitive adhesive layer is colorless and transparent and has a refractive index of 1.4 to 1.6.

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