KR20080086118A - Transflective type liquid crystal display device and method for fabricating the same - Google Patents

Transflective type liquid crystal display device and method for fabricating the same Download PDF

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Publication number
KR20080086118A
KR20080086118A KR1020070027842A KR20070027842A KR20080086118A KR 20080086118 A KR20080086118 A KR 20080086118A KR 1020070027842 A KR1020070027842 A KR 1020070027842A KR 20070027842 A KR20070027842 A KR 20070027842A KR 20080086118 A KR20080086118 A KR 20080086118A
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South Korea
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substrate
liquid crystal
crystal display
wedge
layer
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KR1020070027842A
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Korean (ko)
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최상호
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엘지디스플레이 주식회사
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Priority to KR1020070027842A priority Critical patent/KR20080086118A/en
Publication of KR20080086118A publication Critical patent/KR20080086118A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G02F1/133555—Transflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Liquid Crystal (AREA)

Abstract

A semi-transmission type LCD(Liquid Crystal Display) and a method for manufacturing the same are provided to realize a wide viewing angle by disposing a pixel electrode and a common electrode on a lower substrate, and improve the light efficiency by reflecting light, which is incident to a transmission part, to a reflection part. An array layer(105) is formed on a first substrate(100). A reflecting plate(110) is formed on the array layer, wherein the reflecting plate has a transmission part and a reflection part. A pixel electrode(140) and a common electrode(141) are disposed on the reflecting plate with an insulating layer(135) therebetween. A wedge pattern(180) and a reflection pattern(191) are disposed on a second substrate(101) correspondingly to the transmission part of the reflecting plate. A color filter layer(190) is formed on the wedge pattern and the reflection pattern with an overcoat layer(121) therebetween. A liquid crystal layer is interposed between the first substrate and the second substrate. A first polarizing plate(150a) and a second polarizing plate(150b) are respectively disposed on an outside of the first substrate and an outside of the second substrate.

Description

Transflective Type Liquid Crystal Display Device And Method For Fabricating The Same}

1 is a cross-sectional view showing a conventional transflective liquid crystal display device.

2 is a cross-sectional view showing a transflective liquid crystal display device according to the present invention.

FIG. 3A is a diagram illustrating optical axis angles of the upper polarizer, the compensation plate, and the lower polarizer of FIG. 2.

3B is a view illustrating the reflector region of FIG. 2.

4 is a view for explaining the light reflection path control of the wedge (bid) and the reflection pattern formed on the upper substrate of FIG.

5A to 5E are views illustrating a manufacturing process of the upper substrate of the present invention.

6 is a cross-sectional view of a transflective liquid crystal display according to another exemplary embodiment of the present invention.

7A to 7D are views illustrating a manufacturing process of an upper substrate according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: first insulating substrate 105: array layer

110: reflector 138: insulating film

140: pixel electrode 141: common electrode

180: wedge 181: reflection pattern

145: column spacer

The present invention relates to a transflective liquid crystal display device, and more particularly, to a transflective liquid crystal display device and a method of manufacturing the same, which can realize a wide viewing angle characteristic while maintaining a single cell gap and reduce material costs.

The liquid crystal display may be classified into two types: a transmissive liquid crystal display using a backlight as a light source and a reflective liquid crystal display using natural light as a light source.

The transmissive liquid crystal display uses a backlight as a light source, but can realize a bright image even in a dark environment, but has a disadvantage in that power consumption is high by using a backlight. On the other hand, the reflective liquid crystal display device consumes a small amount of power because it uses natural light in the surrounding environment without using a backlight, but has a disadvantage in that it is impossible to use it in a dark environment.

Therefore, a semi-transmissive liquid crystal display device has been proposed to solve the above problems. Since the transflective liquid crystal display device can use both a reflection type and a transmissive type as needed, it has a relatively low power consumption and can be used even in a dark environment.

1 is a cross-sectional view showing a conventional transflective liquid crystal display device, as shown in FIG. 1, wherein the transflective liquid crystal display device is divided into a reflecting unit and a transmissive unit. The process of forming a reflecting plate in a part is added.

In the transflective liquid crystal display device, the reflecting portion and the transmissive portion are visually recognized by turning on / off the backlight, and the cell gap of the transmissive portion generally has a value approximately twice that of the cell gap of the reflective portion.

In Fig. 1, reference numeral 1 denotes a first insulating substrate, 2 a gate electrode, 3 a gate insulating film, 4 a channel layer (a-Si), 5 a ohmic contact layer (n + a-Si), 6 is a source electrode, 7 is a drain electrode, 8 is a protective film, 9 is a pixel electrode, 10 is a resin film, 11 is a buffer film, 12 is a reflective electrode, 14 is a second insulating substrate, and 15 is a color. The filter layer, 16 represents the common electrode, 20 represents the liquid crystal layer, dr represents the cell gap in the reflecting portion, and dt represents the cell gap in the transmissive portion.

However, the transflective liquid crystal display according to the prior art has a gradient in the VT (voltage / transmittance graph) curve in the reflecting region compared to the transmissive portion due to the difference in cell gaps in the reflecting and transmissive regions, making it difficult to implement gradation. There are disadvantages.

In addition, since the pixel electrode is formed on the lower substrate and the common electrode is formed on the upper substrate, TN (Twist Nematic) mode has a disadvantage in that the viewing angle characteristic is bad.

In addition, there is a problem in that the manufacturing cost is increased because many compensation films must be additionally attached to improve the viewing angle.

The present invention implements a wide viewing angle by arranging pixel electrodes and a common electrode on a lower substrate of a transflective liquid crystal display (IPS mode), and improves light efficiency by reflecting a lamp light source incident on a transmissive area to a reflecting unit. It is an object of the present invention to provide a transflective liquid crystal display device and a manufacturing method thereof.

Another object of the present invention is to provide a transflective liquid crystal display device and a method of manufacturing the same, which can reduce the material cost because the pixel electrode and the common electrode are disposed on the lower substrate, thereby realizing a wide viewing angle without additional compensation film. have.

In addition, the present invention is a semi-transmissive type that can be implemented in the reflection type without changing the optical path of the transmission region and the reflection region by equalizing the light path of the lamp light source incident in the transmission region and the external light source incident and reflected in the reflection region Another object is to provide a liquid crystal display and a method of manufacturing the same.

A semi-transmissive liquid crystal display device according to the present invention for achieving the above object,

A first substrate;

An array layer formed on the first substrate;

A reflection plate including a transmission part and a reflection part on the array layer;

A common electrode and a pixel electrode disposed on the reflective plate with an insulating film interposed therebetween;

A second substrate;

Wedges and reflective patterns disposed on the second substrate in a region corresponding to the transmissive portion of the reflective plate;

A color filter layer disposed on the wedge and the reflective pattern with an overcoat layer interposed therebetween;

A liquid crystal layer interposed between the first substrate and the second substrate; And

And first and second polarizing plates disposed on the outer side of the first substrate and the outer side of the second substrate, respectively.

A semi-transmissive liquid crystal display device according to another embodiment of the present invention,

A first substrate;

An array layer formed on the first substrate;

A reflection plate including a transmission part and a reflection part on the array layer;

A common electrode and a pixel electrode disposed on the reflective plate with an insulating film interposed therebetween;

A second substrate;

A color filter layer disposed on the second substrate;

Wedges and reflection patterns disposed on the color filter layer in a region corresponding to the transmission region of the reflection plate;

An overcoat layer on the wedge and the reflective pattern;

A liquid crystal layer interposed between the first substrate and the second substrate; And

And first and second polarizing plates disposed on the outer side of the first substrate and the outer side of the second substrate, respectively.

Semi-transmissive liquid crystal display device manufacturing method according to another embodiment of the present invention,

Forming an organic layer on the substrate, and then exposing and developing the wedge in subpixel units;

Forming a metal film on the substrate on which the wedge is formed and etching to form a reflective pattern on the wedge;

Forming an overcoat layer on the substrate on which the wedge and the reflective pattern are formed; And

And sequentially forming the black matrix and the red, green, and blue color filter layers on the substrate on which the overcoat layer is formed.

Semi-transmissive liquid crystal display device manufacturing method according to another embodiment of the present invention,

Sequentially forming a black matrix and a red, green, and blue color filter layer on the substrate;

Forming an organic film on the substrate on which the color filter layer is formed, and then exposing and developing the wedge in subpixel units;

Forming a metal film on the substrate on which the wedge is formed and etching to form a reflective pattern on the wedge; And

Forming an overcoat layer on the substrate on which the wedge and the reflective pattern are formed.

According to the present invention, a pixel electrode and a common electrode are disposed on a lower substrate of a transflective liquid crystal display device (In-Plane Switching mode) to realize a wide viewing angle while reflecting a lamp light source incident on a transmissive area to a reflecting portion. The light efficiency can be improved.

In addition, since the pixel electrode and the common electrode are disposed on the lower substrate, the present invention can realize a wide viewing angle characteristic without an additional compensation film, thereby reducing the material cost.

In addition, the present invention can be implemented in a reflective type without changing the optical path of the transmission region and the reflection region by equalizing the light path of the lamp light source incident in the transmission region and the external light source incident and reflected in the reflection region.

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

2 is a cross-sectional view showing a transflective liquid crystal display device according to the present invention.

As shown in FIG. 2, in the lower substrate of the transflective liquid crystal display according to the present invention, an array layer 105 on which elements are formed is formed on the first insulating substrate 100, and on the array layer 105. Each reflecting plate 110 is formed in sub pixel units. In addition, an insulating film 138 for planarization is formed on the first insulating substrate 100 on which the reflecting plate 110 is formed, and the pixel electrode 140 and the common electrode 141 are formed on each of the sub-pixels on the insulating film 138. ) Are alternately formed.

Here, in the array layer 105, a plurality of gate wirings and data wirings are alternately arranged to partition a plurality of subpixels, and thin film transistors are disposed in each subpixel region. In addition, the reflector 110 is divided into a reflector 110b made of an opaque metal and a transmissive part 110a in which an opaque metal is not formed in the central region (see FIG. 3B).

The pixel electrode 140 and the common electrode 141 are indium-oxide (hereinafter referred to as "ITO") and indium zinc oxide (hereinafter referred to as "ITO") which are transparent conductive materials. "," Indium-Tin-Zinc-Oxide (hereinafter referred to as "ITZO") and the like. However, the common electrode 141 may be formed of opaque metals Cu, AlNd, and Mo having low resistance.

The upper substrate of the transflective liquid crystal display device corresponding to the lower substrate includes a wedge 180 and the wedge for reflecting light incident from the backlight unit onto the second insulating substrate 101 to the reflecting plate 110 of the lower substrate. The reflective pattern 181 is formed on the surface of the substrate 180, and the overcoat layer 121 is formed on the second insulating substrate 101 on which the wedge 180 and the reflective pattern 181 are formed. The red (R), green (G), blue (B) color filter layer 190 and the black matrix 191 are formed on the overcoat layer 121, and the transmissive part 110a of the reflective plate 110 of the lower substrate is formed. In the corresponding region, a column spacer 145 is formed to maintain a constant cell gap of the lower substrate and the upper substrate and to guide light traveling from the backlight unit to the wedge 180 and the reflective pattern 181 region of the upper substrate. The column spacer 145 may be formed during the lower substrate manufacturing process.

In addition, a liquid crystal layer 135 is disposed between the upper substrate and the lower substrate.

In addition, condensation patterns 170 are formed on the rear surface of the lower substrate on which the array layer 105 is not formed, and on the rear surface of the upper substrate on which the color filter layer 190 is not formed, a reflecting plate ( A compensation plate 160 is disposed to compensate for light reflected from the 110 and emitted. The condensing pattern 170 condenses the light generated from the backlight unit to the wedge 180 and the reflection pattern 181 formed on the upper substrate so that most of the light generated from the backlight unit is reflected by the reflector 110. do.

In addition, a first polarizing plate 150a and a second polarizing plate 150b are further disposed on the rear surface of the lower substrate and the rear surface of the upper substrate.

According to the present invention, there is an advantage in that an image can be displayed by maintaining the same path of reflection of external light and internal light generated from the backlight unit while maintaining a single cell gap. In addition, since the image can be displayed by reflecting the internal light source to the reflector, the screen quality is improved, and the light efficiency is improved and the manufacturing cost is reduced compared to the reflective liquid crystal display device which displays the image using only external light.

FIG. 3A is a diagram illustrating optical axis angles of the upper polarizer, the compensation plate, and the lower polarizer of FIG. 2, and FIG. 3B is a view of the reflector region of FIG. 2.

As shown in FIGS. 3A and 3B, the upper polarizing plate, the compensating plate, and the lower polarizing plate have an angle θ1 formed by the upper polarizing plate and the compensating plate so as to maintain a uniform black brightness in the dark state. The angle (θ2) between the rubbing direction of the liquid crystal and the upper polarizing plate is θ2 = 2 × θ1 + 45 °, and the angle (θ3) between the lower polarizing plate and the upper polarizing plate is θ3. Design as = 2xθ1.

As shown in FIG. 3B, the structure of the reflector plate 100 used in the liquid crystal display device of the present invention includes a reflector 110b formed of an opaque metal and a transmissive part 110a which is an open area in which the opaque metal is not formed in the central region of the reflector plate. It is composed of The reflector 110b reflects external light incident from the outside of the upper substrate of the liquid crystal display, and transmits internal light generated from the backlight unit to the transmissive part 110a of the reflector to be reflected by the reflector 110b.

That is, in the present invention, the external light is reflected by the reflecting part 100b of the reflecting plate, and the inner light is transmitted by the transmitting part 110a of the reflecting plate, and then is reflected by the reflecting means (wedge and reflecting pattern in FIG. 2) formed on the upper substrate. Reflected by the reflecting unit 110b of the reflector to implement a reflection type liquid crystal display device to improve the light efficiency.

4 is a view for explaining the light reflection path control of the wedge (bid) and the reflection pattern formed on the upper substrate of FIG. As shown in FIG. 4, the wedge 280 formed on the upper substrate of the liquid crystal display device and the reflective pattern 281 formed on the wedge 280 of the liquid crystal display device of FIG. The inclination angle Φ of the wedge 280 for reflecting to the reflector region is shown.

A reflecting plate 210 having a transmissive portion 210a and a reflecting portion 210b is formed on the first insulating substrate 200, and is formed on the second insulating substrate 201 facing the first insulating substrate 200. A wedge 280 having an inclined surface and a reflective pattern 281 formed on the wedge 280 are formed, and an overcoat layer 221 is formed on the wedge 280 and the reflective pattern 281.

The position of the wedge 280 and the reflective pattern 281 corresponds to the transmission portion 210a of the reflective plate 210 formed on the first insulating substrate 200.

At this time, the inclination angle Φ of the wedge 280 is an angle formed with the reference to the surface of the second insulating substrate 201.

When the width of the transmissive portion 210a of the reflecting plate 210 is A, the center of the wedge 280 is located at the center of the transmissive portion 210a, and the light transmitted through the transmissive portion 210a is formed by the wedge 280. 2 is reflected at an angle twice that of the angle Φ formed with the insulating substrate 201. The formula applied at this time is tan2Φ = A / (2d). Here, d is a distance from the reflective pattern 281 formed at the vertex region of the wedge 280 to the reflective plate 210 formed on the first insulating substrate 200.

Therefore, when the inclination angle Φ of the wedge 280 or the distance d between the wedge 280 and the reflecting plate 210 is adjusted, most of the light incident from the back surface of the first insulating substrate 200 is reflected toward the reflecting plate 210. You can proceed.

Therefore, as shown in FIG. 2, the inclination angle of the wedge 180 is adjusted or the wedge 180 is reflected so that the light incident from the backlight unit (not shown) disposed on the rear surface of the lower substrate is reflected toward the reflecting plate 110. And the distance between the reflector 110 and the reflector 110 may be adjusted.

5A to 5E are views illustrating a manufacturing process of the upper substrate of the present invention.

5A through 5E illustrate a process of manufacturing the upper substrate of FIG. 2. 5A and 5B, an organic film is coated on the second insulating substrate 101, and then a mask process is performed to form a wedge 180 pattern having a triangular pyramid shape. When the wedge 180 is formed on the second insulating substrate 101 as described above, an opaque metal film 185 having high reflectance is formed on the second insulating substrate 101. Then, as illustrated in FIG. 5C, the reflective pattern 181 is formed on the wedge 180 by etching by a photolithography method including a mask.

Then, the overcoat layer 121 made of an organic material is formed on the entire region of the second insulating substrate 101 for planarization. As described above, when the overcoat layer 121 is formed on the second insulating substrate 101, as shown in FIG. 5D, an opaque synthetic resin or an opaque metal film is formed on the second insulating substrate 101, and a mask is formed. The black matrix 191 is formed by etching the photolithography method. Subsequently, red (R), green (G), and blue (B) color resins are sequentially formed on the second insulating substrate 101, and then a mask process is performed to perform red, green, The blue color filter layer 190 is formed.

In this case, the overcoat layer 121 is exposed without forming the color filter layer 190 in the region corresponding to the wedge 180 and the reflective pattern 181 formed on the second insulating substrate 101. The region where the color filter layer 190 is not formed corresponds to the transmissive region of the reflector shown in the lower substrate of FIG. 2.

As described above, when the color filter layer 190 and the black matrix 191 are formed on the second insulating substrate 101, as shown in FIG. 5E, an organic film made of an organic material is formed on the second insulating substrate 101. After forming on the entire surface, a mask process is performed to form the column spacer 145 on the exposed region of the overcoat layer 121 of the color filter layer 190. Therefore, the regions where the overcoat layer 121 is exposed among the column spacer 145 and the color filter layer 190 exist in each sub-pixel unit.

The column spacer 145 may be formed on the lower substrate on which the reflective plate is formed, rather than on the upper substrate on which the color filter layer 190 is formed.

When the upper substrate including the color filter layer 190 is completed as described above, the alignment layer forming process and the rubbing process are performed, and then the bonding process and the liquid crystal injection process are performed with the lower substrate on which the reflecting plate, the pixel electrode, and the common electrode are formed.

6 is a cross-sectional view of a transflective liquid crystal display according to another exemplary embodiment of the present invention. As shown in FIG. 6, in the lower substrate of the transflective liquid crystal display according to the present invention, an array layer 305 in which elements are formed is formed on the first insulating substrate 300, and the array layer 305 is formed. Reflecting plates 310 are formed on the sub-pixel units, respectively. In addition, an insulating film 338 for planarization is formed on the first insulating substrate 300 on which the reflecting plate 310 is formed, and the pixel electrode 340 and the common electrode 341 are formed on each of the sub-pixels on the insulating film 338. ) Are alternately formed.

Here, in the array layer 305, a plurality of gate wirings and data wirings are alternately arranged to partition a plurality of subpixels, and a thin film transistor (not shown) is disposed in each subpixel region. In addition, the reflective plate 310 is divided into a reflective portion 310b made of an opaque metal and a transmissive portion 310a in which an opaque metal is not formed in a central region.

The pixel electrode 340 and the common electrode 341 are indium oxide (Indium-Tin-Oxide; " ITO ") and indium zinc oxide (hereinafter, " IZO ") which are transparent conductive materials. "," Indium-Tin-Zinc-Oxide (hereinafter referred to as "ITZO") and the like. However, the common electrode 341 may be formed of opaque metals Cu, AlNd, and Mo having low resistance.

In the upper substrate of the transflective liquid crystal display device corresponding to the lower substrate, a black matrix 391 and a color filter layer 390 composed of red, green, and blue are formed on the second insulating substrate 301. On the second insulating substrate 301 on which the color filter layer 390 is formed, a wedge 380 for reflecting light incident from the backlight unit to the reflector 310 of the lower substrate and a reflection pattern formed on the surface of the wedge 380. 181 is formed, and an overcoat layer 321 is formed on the second insulating substrate 301 on which the wedge 380 and the reflective pattern 381 are formed. In addition, in the region corresponding to the transmissive portion 310a of the reflecting plate 310 of the lower substrate, a constant cell gap of the lower substrate and the upper substrate is maintained, and light propagated from the backlight unit is transferred to the wedge 380 and the reflective pattern 381 of the upper substrate. A column spacer 345 for inducing is formed on the overcoat layer 321. The column spacer 345 may be formed during the lower substrate manufacturing process.

In addition, a liquid crystal layer 335 is interposed between the upper substrate and the lower substrate.

In addition, light collecting patterns 370 corresponding to sub-pixel units are formed on the bottom surface of the lower substrate on which the array layer 305 is not formed, and the reflective plate 310 is formed on the bottom surface of the upper substrate on which the color filter layer 390 is not formed. Compensation plate 360 is disposed to compensate for the light reflected from the () emitted. The light condensing pattern 370 condenses the light generated from the backlight unit to the wedge 380 and the reflection pattern 381 formed on the upper substrate so that the internal light of the liquid crystal display is reflected by the reflecting plate 310.

In addition, a first polarizing plate 350a and a second polarizing plate 350b are further disposed on the rear surface of the lower substrate and the rear surface of the upper substrate.

Accordingly, in the present invention, the internal light source generated from the external light and the backlight unit is reflected on the reflector while maintaining a single cell gap, thereby displaying an image, thereby improving light efficiency and reducing manufacturing cost.

7A to 7D are views illustrating a manufacturing process of an upper substrate according to another embodiment of the present invention.

As shown in FIG. 7A, an opaque synthetic resin or an opaque metal is formed on the transparent second insulating substrate 301 and then etched by a photolithography method including a mask to form a black matrix 391. The red, green, and blue color resins are sequentially formed on the second insulating substrate 301 on which the black matrix 391 is formed, and the exposure and development processes are performed in turn to each sub-pixel partitioned by the black matrix 391. The red, green, and blue color filter layers 390 are formed.

When the color filter layer 390 is formed as described above, as shown in FIG. 7B, an organic layer is formed on the second insulating substrate 301, and then patterned by exposure and development processes to form wedges in units of subpixels. 380 is formed. Then, as shown in FIG. 7C, a metal film is formed on the second insulating substrate 301 and then etched by a photolithography method including a mask to form the reflective pattern 381 on the wedge 380. Form.

When the wedge 380 and the reflective pattern 381 is formed on the second insulating substrate 301 as described above, as shown in FIG. 7D, the overcoat layer 321 is formed on the second insulating substrate 301. do. Thereafter, an organic layer is formed on the second insulating substrate 301 and then subjected to an exposure and development process to form a column spacer 345 in the wedge 380 and the reflective pattern 381 forming region.

As described above, the present invention reflects the internal light generated from the external light and the backlight unit while having a single cell gap to display an image, thereby improving the light efficiency and reducing the manufacturing cost.

As described in detail above, the present invention provides a lamp light source incident to a transmissive area while realizing a wide viewing angle by arranging a pixel electrode and a common electrode on a lower substrate of a transflective liquid crystal display (In-Plane Switching mode). By reflecting to the reflecting portion has an effect of improving the light efficiency.

In addition, since the pixel electrode and the common electrode are disposed on the lower substrate, the present invention can realize a wide viewing angle characteristic without an additional compensation film, thereby reducing the material cost.

In addition, the present invention has the effect of implementing the reflection type without changing the optical path of the transmission region and the reflection region by equalizing the light path of the lamp light source incident in the transmission region and the external light source incident and reflected in the reflection region. .

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (24)

A first substrate; An array layer formed on the first substrate; A reflection plate including a transmission part and a reflection part on the array layer; A common electrode and a pixel electrode disposed on the reflective plate with an insulating film interposed therebetween; A second substrate; Wedges and reflective patterns disposed on the second substrate in a region corresponding to the transmissive portion of the reflective plate; A color filter layer disposed on the wedge and the reflective pattern with an overcoat layer interposed therebetween; A liquid crystal layer interposed between the first substrate and the second substrate; And A transflective liquid crystal display device comprising first and second polarizing plates disposed on an outer side of the first substrate and an outer side of the second substrate, respectively. The transflective liquid crystal display of claim 1, wherein the array layer comprises a thin film transistor, a gate line, and a data line.  The transflective liquid crystal display of claim 1, wherein the pixel electrode and the common electrode are formed of a transparent conductive material. The transflective liquid crystal display of claim 1, wherein the pixel electrode and the common electrode are formed of one of ITO, IZO, and ITZO. The transflective liquid crystal display of claim 1, wherein the wedge is formed of an organic material. The transflective liquid crystal display of claim 1, wherein condensing patterns are formed on a rear surface of the first substrate on which the array layer is formed. The transflective liquid crystal display of claim 1, wherein a compensation plate is disposed on a rear surface of the second substrate on which the color filter layer is formed. The semi-transmissive liquid crystal display device according to claim 7, wherein when the liquid crystal display device is in a dark state, an angle θ1 between the second polarizing plate and the compensation plate is in a range of 5 ° to 30 °. The transflective liquid crystal display device according to claim 8, wherein when the liquid crystal display device is in a dark state, the rubbing direction of the liquid crystal and the angle of the second polarizing plate are θ2 = 2 x θ1 + 45 °. The method according to claim 8, wherein when the width of the transmissive part of the reflecting plate is A, the distance between the wedge and the reflecting plate is d, and the inclination angle of the wedge is Φ, it is designed by the formula of tan2Φ = A / (2d). 1. A transflective liquid crystal display device, wherein a light source incident from a rear surface of a substrate is reflected by the reflecting plate. A first substrate; An array layer formed on the first substrate; A reflection plate including a transmission part and a reflection part on the array layer; A common electrode and a pixel electrode disposed on the reflective plate with an insulating film interposed therebetween; A second substrate; A color filter layer disposed on the second substrate; Wedges and reflection patterns disposed on the color filter layer in a region corresponding to the transmission region of the reflection plate; An overcoat layer on the wedge and the reflective pattern; A liquid crystal layer interposed between the first substrate and the second substrate; And A transflective liquid crystal display device comprising first and second polarizing plates disposed on an outer side of the first substrate and an outer side of the second substrate, respectively. 12. The transflective liquid crystal display of claim 11, wherein the array layer includes a thin film transistor, a gate line, and a data line.  The transflective liquid crystal display of claim 11, wherein the pixel electrode and the common electrode are formed of a transparent conductive material. 12. The transflective liquid crystal display of claim 11, wherein the pixel electrode and the common electrode are made of one of ITO, IZO, and ITZO. 12. The transflective liquid crystal display of claim 11, wherein the wedge is formed of an organic material. The transflective liquid crystal display of claim 11, wherein condensing patterns are formed on a rear surface of the first substrate on which the array layer is formed. 12. The transflective liquid crystal display of claim 11, wherein a compensation plate is disposed on a rear surface of the second substrate on which the color filter layer is formed. 18. The transflective liquid crystal display according to claim 17, wherein an angle θ1 between the second polarizing plate and the compensation plate is in a range of 5 ° to 30 ° when the liquid crystal display is in a dark state. 19. The transflective liquid crystal display device according to claim 18, wherein when the liquid crystal display device is in a dark state, the rubbing direction of the liquid crystal and the angle of the second polarizing plate are θ2 = 2 x θ1 + 45 degrees. 19. The method according to claim 18, wherein when the width of the transmissive part of the reflecting plate is A, the distance between the wedge and the reflecting plate is d, and the inclination angle of the wedge is?, 1. A transflective liquid crystal display device, wherein a light source incident from a rear surface of a substrate is reflected by the reflecting plate. Forming an organic film on the substrate, and then exposing and developing the wedge in subpixel units; Forming a metal film on the substrate on which the wedge is formed and etching to form a reflective pattern on the wedge; Forming an overcoat layer on the substrate on which the wedge and the reflective pattern are formed; And And sequentially forming a black matrix and a red, green, and blue color filter layer on the substrate on which the overcoat layer is formed. 22. The method of claim 21, further comprising forming a column spacer by forming an organic layer on the overcoat layer corresponding to the wedge and the reflective pattern, and then patterning the column spacer. Sequentially forming a black matrix and a red, green, and blue color filter layer on the substrate; Forming an organic film on the substrate on which the color filter layer is formed, and then exposing and developing the wedge in subpixel units; Forming a metal film on the substrate on which the wedge is formed and etching to form a reflective pattern on the wedge; And And forming an overcoat layer on the substrate on which the wedge and the reflective pattern are formed. 24. The method of claim 23, further comprising forming a column spacer by forming an organic layer on the overcoat layer corresponding to the wedge and the reflection pattern, and then patterning the column spacer.
KR1020070027842A 2007-03-21 2007-03-21 Transflective type liquid crystal display device and method for fabricating the same KR20080086118A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010113327A (en) * 2008-11-06 2010-05-20 Acer Inc Pixel structure, optical element, three-dimensional image/wide viewing angle liquid crystal display device, and method of manufacturing the same
WO2019047601A1 (en) * 2017-09-05 2019-03-14 京东方科技集团股份有限公司 Display panel and preparation method therefor and display device thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010113327A (en) * 2008-11-06 2010-05-20 Acer Inc Pixel structure, optical element, three-dimensional image/wide viewing angle liquid crystal display device, and method of manufacturing the same
US8179503B2 (en) 2008-11-06 2012-05-15 Acer Incorporated Pixel structure, 3D image/multiple view liquid crystal display device and method of manufacturing the same
WO2019047601A1 (en) * 2017-09-05 2019-03-14 京东方科技集团股份有限公司 Display panel and preparation method therefor and display device thereof
US11327359B2 (en) 2017-09-05 2022-05-10 Hefei Boe Optoelectronics Technology Co., Ltd. Display panel, method for manufacturing the same and display device

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