KR20110031010A - Transflective liquid crystal display device - Google Patents

Transflective liquid crystal display device Download PDF

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Publication number
KR20110031010A
KR20110031010A KR1020090088712A KR20090088712A KR20110031010A KR 20110031010 A KR20110031010 A KR 20110031010A KR 1020090088712 A KR1020090088712 A KR 1020090088712A KR 20090088712 A KR20090088712 A KR 20090088712A KR 20110031010 A KR20110031010 A KR 20110031010A
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South Korea
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substrate
insulating layer
electrode
liquid crystal
pixels
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KR1020090088712A
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Korean (ko)
Inventor
박경호
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엘지디스플레이 주식회사
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Priority to KR1020090088712A priority Critical patent/KR20110031010A/en
Publication of KR20110031010A publication Critical patent/KR20110031010A/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

Abstract

The present invention is to improve the transmittance by forming the pixel structure of the transmissive R, G, B pixels and the reflective w pixels, the plurality of R (Red), G (Green), B (Blue) pixels of the transmissive type ; And a plurality of W (white) pixels of a reflective type, wherein the R, G, B, and W pixels are arranged in a quadrangular shape.

LCD, Reflective, Transmissive, W Pixel, Reflective Layer

Description

Reflective liquid crystal display device {TRANSFLECTIVE LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective transmissive liquid crystal display device, comprising a transmissive R, G, B pixel and a reflective w pixel, which can improve transmittance.

Recently, with the development of various portable electronic devices such as mobile phones, PDAs, and notebook computers, there is an increasing demand for flat panel display devices for light and thin applications. Such flat panel displays are being actively researched, such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), FED (Field Emission Display), VFD (Vacuum Fluorescent Display), but mass production technology, ease of driving means, Liquid crystal display devices (LCDs) are in the spotlight for reasons of implementation.

As the liquid crystal display device, a transmission type has been mainly used until now. The transmissive liquid crystal display device is equipped with a backlight for emitting white light on the rear side of the liquid crystal panel, i.e., the opposite side of the screen, and displays the desired image by transmitting the backlight through the liquid crystal layer. However, such a transmissive liquid crystal display device has a problem in that the use time is shortened when it is applied to a portable electronic device by a backlight which consumes about 70% of the power of all liquid crystal display devices.

The liquid crystal display device proposed to solve this problem is a reflective liquid crystal display device. Instead of using a high power consumption backlight as a light source, the reflective liquid crystal display element realizes an image by reflecting natural light incident from the outside to the reflecting means, thereby achieving a smaller power consumption and lighter weight than a transmissive liquid crystal display element. It has advantages However, such a reflective liquid crystal display device also has a fatal weakness that it cannot be used at night or in a dark room where natural light does not exist.

Therefore, a reflective transmissive liquid crystal display device having the advantages of the transmissive liquid crystal display device and the reflective liquid crystal display device has been proposed.

However, there is a problem in such a reflective liquid crystal display device as follows.

In order to minimize power consumption, the reflective transmissive liquid crystal display device implements an image by dividing the pixel into a reflecting unit and a transmissive unit, and thus the luminance is lower than that of the transmissive liquid crystal display device. In order to solve this problem, a configuration of minimizing absorption of light by the color filter by removing a part of the color filter formed in the reflector has been proposed.

That is, as shown in FIG. 1, R, G, and B pixels are formed, and each of the pixels is a transmissive part R (T), G (T), B (T) and a reflecting part R (R), G ( In the liquid crystal display device consisting of R) and B (R), the transmissive portions R (T), G (T), and B (T) have a color filter layer formed thereon, whereas the reflective portions R (R) Only a portion of the color filter layer is formed in G (R) and B (R), and a window 6 in which the color filter layer is not formed is formed in the center region thereof, and the light emitted through the window 6 is the color filter layer. Since it is not absorbed by, the luminance is improved.

However, even in the liquid crystal display device having such a structure, since a color filter is formed in some areas of the reflectors R (R), G (R), and B (R), the light incident and reflected by the reflector is still emitted. In addition, the liquid crystal display element having such a structure has a limitation in improving the luminance, because some of the color filters of the reflecting portion are removed, thereby degrading the color characteristics of the reflecting portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a reflective transmissive liquid crystal display device having improved transmittance by forming a pixel structure of transmissive R, G, B pixels and reflective w pixels.

In order to achieve the above object, the liquid crystal display device according to the present invention comprises a plurality of R (Red), G (Green), B (Blue) pixels made of a transmission type; And a plurality of W (white) pixels of a reflective type, wherein the R, G, B, and W pixels are arranged in a quadrangular shape.

In this case, the R, G, and B pixels are formed on a first substrate, a second substrate, a thin film transistor formed on the first substrate, a first insulating layer formed on the entire substrate on which the thin film transistor is formed, and the first insulating layer. A common electrode and a pixel electrode forming an electric field substantially parallel to the surface of the first substrate, a black matrix formed on the second substrate to block light, and an R, G, B color filter layer formed on the second substrate; The W pixel may include a thin film transistor formed on the first substrate, a second insulating layer formed over the entire substrate on which the thin film transistor is formed, and having an embossed pattern, and a reflective layer formed on the second insulating layer to reflect incident light. A first insulating layer formed on the reflective layer; A common electrode and a pixel electrode formed on the first insulating layer to form an electric field substantially parallel to the surface of the first substrate, and a black matrix formed on the second substrate to block light.

In addition, the R, G, and B pixels may include a first substrate, a second substrate, a thin film transistor formed on the first substrate, a first insulating layer formed over the entire substrate on which the thin film transistor is formed, and an image display of the first insulating layer. A first electrode formed over the entire region, a second insulating layer formed on the first insulating layer on which the first electrode is formed, a second electrode formed on the second insulating layer to form a fringe field with the first electrode, and the second electrode And a black matrix formed on a substrate to block light, and an R, G, and B color filter layer formed on the second substrate, wherein the W pixel is formed over the entire substrate on which the thin film transistor and the thin film transistor are formed. A third insulating layer formed on the third insulating layer, the reflective layer reflecting light incident on the third insulating layer, the first insulating layer formed on the reflective layer, and the entire image display area of the first insulating layer. A first electrode formed over, a second insulating layer formed on the first insulating layer on which the first electrode is formed, a second electrode formed on the second insulating layer to form a fringe field with the first electrode, and formed on the second substrate It is characterized by consisting of a black matrix blocking the light.

In the present invention, the transmittance can be improved by forming the pixel structure of the transmissive R, G, B pixels and the reflective w pixels. In addition, the present invention includes a diffusion layer for reflecting and scattering light incident on the R, G, and B pixels, thereby reflecting light in the reflection mode, thereby achieving high efficiency color reproducibility in the reflection mode.

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

2 is a view showing a pixel structure of a liquid crystal display device according to the present invention. As shown in FIG. 2, in the present invention, R (Red), G (Green), B (Blue), and W (White) pixels are basically formed in a rectangular shape (preferably square). In this case, the R, G, and B colors are provided with R, G, and B color filter layers, respectively, to implement colors of R, G, and B, and the W pixels do not include the color filter layer, and natural light is emitted as it is.

In addition, the R, G, and B pixels are pixels in the transmissive mode, respectively, and the light emitted from the backlight transmits the R, G, and B pixels, thereby implementing R, G, and B colors. On the other hand, the W pixel is a pixel in reflection mode, and implements an image by reflecting light incident from external natural light as it is.

In the conventional reflection-transmissive liquid crystal display device, each of the R, G, and B pixels is composed of a reflecting portion and a transmitting portion, and the color filter of the reflecting portion is partially removed to emit natural light. And a separate W pixel is formed in a reflection mode to implement an image by external light.

As described above, in the present invention, since the R, G, and B pixels in the transmissive mode and the W pixels in the reflective mode are arranged in a quadrangular shape, it can be referred to as a reflective liquid crystal display device or a transmissive liquid crystal display device based only on each pixel. It can be said to be a transmissive liquid crystal display device in that it can be used simultaneously in a reflection mode and a transmission mode as a whole.

The concrete structure of the reflective transmissive liquid crystal display device as described above will be described in more detail as follows.

3 is a cross-sectional view showing the structure of a reflective liquid crystal display device according to a first embodiment of the present invention. In this case, the liquid crystal display device is an in-plane switching mode liquid crystal display device, and only two pixels are shown in the drawing. The reason is that the structure of the R, G, and B pixels except for the color filter layer. This is because the structure is substantially the same. Therefore, hereinafter, the pixels in the transmissive mode will be referred to collectively as R, G, and B pixels.

As shown in FIG. 3, the liquid crystal display device according to the first exemplary embodiment of the present invention includes a first substrate 120 and a second substrate 140 and a liquid crystal layer 150 formed therebetween.

A diffusion layer 121 made of a diffusion material is formed on the first substrate 120, and a first insulating layer 122 is formed thereon. The diffusion layer 121 reflects light incident to the outside and scatters the same, and exits again.

Gate electrodes 111 are formed on the R, G, B pixels, and the W pixels on the first insulating layer 122, respectively. The gate electrode 111 is made of aluminum (Al), aluminum alloy (Al alloy), tungsten (W), copper (Cu), chromium (Cr), molybdenum (Mo), and molybdenum Low resistance opaque conductive materials such as alloys can be used. In addition, the gate electrode 111 may have a multilayer structure in which two or more low resistance conductive materials are stacked.

A second insulating layer 122 made of an organic insulating material such as SiOx or SiNx, that is, a gate insulating layer, is stacked on the entire first substrate 120 on which the gate electrode 111 is formed. A semiconductor layer 113, such as amorphous silicon (a-Si), is formed on each of the second insulating layers 122 of R, G, B pixels, and W pixels, and a source electrode 115 and a drain electrode 116 are formed thereon. ) Is formed.

Although not shown, an impurity amorphous silicon layer is formed on the semiconductor layer 113 to form an ohmic contact layer. The ohmic contact layer may include a source region and a drain region of the semiconductor layer 113. It serves to ohmic-contact the source electrode 115 and the drain electrode 116.

In addition, a third insulating layer 125 is formed on the entire W pixel. The third insulating layer 125 is formed of an organic material such as BCB (Benzo Cyclo Butene) or Photo Acryl, and is selectively patterned through a photolithography process to form an embossed pattern of concave and convex shape.

The embossing pattern is for uniformly emitting light reflected by scattering light incident from the outside. In the drawing, although the embossing pattern 130 of the third insulating layer 125 is uniformly disposed in the W pixel, The embossing pattern may be irregularly arranged in the W pixel. The embossing pattern may be applied to any shape as long as it can efficiently scatter incident light. Although not shown in the drawing, an insulating layer made of an inorganic material may be formed under the third insulating layer 125.

The reflective layer 127 is formed on the third insulating layer 125 formed of the embossing pattern. The reflective layer 127 is formed of a material having a good reflectance such as aluminum or an aluminum alloy, and is formed by a photolithography process.

The organic material such as BCB or photoacryl is stacked on the source electrode 115 and the drain electrode 116 of the R, G, and B pixels, on the second insulating layer 124, and on the reflective layer 127 of the W pixel. The insulation layer 128 is formed, and the common electrode 132 and the pixel electrode 134 are formed on the R, G, B pixels, and the W pixels thereon, respectively.

The common electrode 132 and the pixel electrode 134 may be formed by stacking opaque materials having good conductivity such as Cr, Mo, Ta, Cu, Ti, Al, or Al alloy, and then etching them by a photolithography method. It may be formed by stacking and etching a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) having good conductivity. In addition, one of the common electrode and the pixel electrode may be formed of an opaque material and the other may be formed of a transparent conductive material.

Although not shown in the drawing, the common electrode 132 and the pixel electrode 134 formed in the R, G, B pixels, and the W pixels are disposed in a band shape substantially in parallel with the data line, thereby forming the first substrate 120. Form a transverse electric field parallel to the surface.

Black matrices 142 are formed on the R, G, B pixels, and the W pixels of the second substrate 140, respectively. The black matrix 142 is formed of a metal material such as Cr or CrOx, or a black resin, and is disposed in an area where an image is not implemented, for example, a gate line forming area, a data line forming area, or a thin film transistor forming area. It is possible to prevent light from passing through the area and deteriorating image quality.

The color filter layer 144 is formed on the R, G, and B pixels on which the black matrix 142 is formed. Although not illustrated in detail, an R color filter layer is formed on an R pixel, a G color filter layer is formed on a G pixel, and a B color filter layer is formed on a B pixel to implement a corresponding color. However, no color filter layer is formed in the W pixel, and therefore, a black and white image is realized in the W pixel.

The liquid crystal layer 150 is formed between the first substrate 120 and the second substrate 140.

In the liquid crystal display device having such a configuration, as a signal is applied through the thin film transistor, a transverse electric field substantially parallel to the surface of the first substrate 120 is formed between the common electrode 132 and the pixel electrode 133. The liquid crystal molecules of 150 are rotated horizontally with the surface of the first substrate 120 along the transverse electric field to adjust the transmittance of light passing through the liquid crystal layer to realize an image.

In this case, the R, G, and B pixels are transmissive and the W pixels are reflective. Accordingly, the light emitted from the backlight not shown in the R, G, and B pixels passes through the liquid crystal layer 150 and then passes through the color filter layer 144 to implement the corresponding color. In the W pixel, external light is incident. The light is reflected by the reflective layer 127 and then emitted to the outside through the liquid crystal layer 150 to implement an image. In this case, since the W pixel does not have a color filter layer, the image implemented by the W pixel is implemented in black and white.

On the other hand, the diffusion layer 121 is formed in the R, G, B pixels. Since the diffusion layer 121 reflects and scatters light incident from the outside in the R, G, and B pixels and exits through the color filter layers of the R, G, and B pixels, colors in the reflection mode may be realized. Of course, the implementation rate of this color is very low. However, in the conventional reflection-transmissive liquid crystal display device, the color reproducibility at the reflecting portion of the R, G, and B pixels is about 2-3%. Since it implements 2-3% or more, the color reproducibility is not lowered compared to the prior art, and the reflectance is improved, so that the luminance in the reflection mode is improved.

4 is a view showing the structure of a liquid crystal display device according to a second embodiment of the present invention. In this case, the liquid crystal display device is a fringe field mode liquid crystal display device, except that the structure of the electrode is the same as that of the IPS mode liquid crystal display device. Therefore, the detailed description of the same structure will be omitted. Only the details will be described.

As shown in FIG. 4, a diffusion layer 221 and a first insulating layer 222 are formed on the first substrate 210, and the gate electrodes 221, R, G, B pixels, and W pixels thereon, respectively, are formed thereon. The thin film transistor including the semiconductor layer 213, the source electrode 215, and the drain electrode 216 is formed.

A third insulating layer 225 and an reflective layer 228 having an embossed pattern are formed in the W pixel region of the first substrate 220 on which the thin film transistor is formed.

The fourth insulating layer 228 made of an organic material is formed on the thin film transistors of the R, G, and B pixels, and on the reflective layer 228 of the W pixels, and the common electrode 232 is formed thereon. A fifth insulating layer 229 made of an organic material or an inorganic material is formed on the fourth insulating layer 228 on which the common electrode 232 is formed, and the pixel electrode 233 is formed on the fifth insulating layer 229. do. The common electrode 232 and the pixel electrode 233 may be formed of an opaque metal or a transparent conductive material such as ITO or IZO.

Although not shown in detail, the common electrode 232 is formed over the entire image display area of the R, G, B pixels, and the W pixels, and the pixel electrode 233 is formed in a band shape having a predetermined width or in a band shape. Formed over the entire image display area of the R, G, B pixels, and the W pixel, and has a slit of substantially the same as the surface of the first substrate 220 between the common electrode 232 and the edge area of the pixel electrode 233; Parallel fringe fields are formed.

In this case, the common electrode 232 may be formed on the fifth insulating layer 229, and the pixel electrode 233 may be formed on the fourth insulating layer 228, and the common electrode 232 may be formed in a band shape. It may be formed in the form of a conductive layer having a slit, and the pixel electrode 232 may be formed of a conductive layer formed over the entire image display region of R, G, B pixels, and W pixels.

Black matrices 242 are formed in the R, G, B, and W pixels of the second substrate 240, respectively. The color filter layer 244 is formed on the R, G, and B pixels on which the black matrix 242 is formed, and the color filter layer is not formed on the W pixel.

The liquid crystal layer 150 is formed between the first substrate 120 and the second substrate 140.

In the liquid crystal display device having such a configuration, an electric field substantially parallel to the surface of the first substrate 220 is formed between the common electrode 232 and the pixel electrode 233 as a signal is applied through the thin film transistor. The liquid crystal molecules of 250 are rotated horizontally with the surface of the first substrate 220 along the transverse electric field to adjust the transmittance of light passing through the liquid crystal layer to realize an image.

In this embodiment, as in the first embodiment, since the R, G, and B pixels are transmissive and the W pixels are the reflection type, the R, G, and B pixels use the color filter layer 244 to implement the corresponding colors. External light is reflected by the reflective layer 227 to implement an image. In this case, since the W pixel does not have a color filter layer, the image implemented by the W pixel is implemented in black and white. In addition, since the diffusion layer 221 is formed on the R, G, and B pixels, the color in the reflection mode may be realized by reflecting and scattering the light incident from the R, G, and B pixels from the outside.

As described above, in the present invention, R, G, B pixels made of a transmissive type and W pixels made of a reflective type are arranged in a quadrangular shape, and R, G, B pixels do not realize color by removing a color filter layer. Since the color is reproduced by the diffusion layer formed in the structure, the luminance can be improved as compared with the conventional structure in which the reflection portion and the pixel portion are formed in R, G, and B pixels, and a part of the color filter layer of the reflection portion is removed.

FIG. 5 is a view showing reflectances in a reflection unit and a W pixel of a conventional reflective transmissive liquid crystal display device and a liquid crystal display device according to the present invention. As shown in FIG. 5, in the conventional reflective transmissive liquid crystal display, only about 2.7-2.8% of light incident from the outside is reflected when a voltage of about 5V is applied, but in the liquid crystal display of the present invention, about 3.2-3.3% It is possible to reflect light. In conclusion, it can be seen that in the liquid crystal display device of the present invention, the reflectance in the reflection mode is improved by about 20%, and as a result, the luminance is improved as compared with the conventional reflection-transmissive liquid crystal display device.

6 is a view showing the transmittance of a conventional transflective liquid crystal display device and a liquid crystal display device according to the present invention. As shown in FIG. 6, the value of the transmittance according to the voltage of the conventional reflective transmissive liquid crystal display is substantially similar to the value of the transmittance according to the voltage of the liquid crystal display of the present invention. As shown in the present invention, the transmissive efficiency in the transmissive mode of the liquid crystal display device having a rectangular arrangement of R, G, and B pixels having a transmissive type and a W pixel having a reflective type is reflected in the R, G, and B pixels. It is shown that it is almost the same as the transmission efficiency of the conventional liquid crystal display device which forms the pixel portion and removes part of the color filter layer of the reflecting portion.

In conclusion, in the liquid crystal display device of the present invention, the luminance in the reflection mode is improved and the luminance in the transmissive mode is almost similar to that of the conventional liquid crystal display device. Thus, the quality of the liquid crystal display device is significantly improved compared to the conventional liquid crystal display device. It can be seen that.

On the other hand, in the above detailed description is described with respect to the liquid crystal display device having a specific structure, this is for the convenience of the description of the specific structure is illustrated and the present invention is not limited only to the liquid crystal display device of such a structure.

For example, in the detailed description, only the liquid crystal display device of the IPS mode and the FFS mode liquid crystal display device are described. However, the present invention is not limited to the liquid crystal display device of this particular mode, but various forms of liquid crystal display devices, for example, The liquid crystal molecules can be applied to liquid crystal display devices having various structures that can improve viewing angle characteristics by horizontally switching the liquid crystal molecules, and can be applied to liquid crystal display devices by vertically driving liquid crystal molecules as in the TN mode. Also, the present invention may be applied to a liquid crystal display device using a ferroelectric liquid crystal or a liquid crystal display device using a cholesteric liquid crystal.

In other words, as in the present invention, each pixel structure of the liquid crystal display device having a structure in which the R, G, B pixels made of the transmission type and the W pixels made of the reflection type are arranged in a square shape is applicable to the pixel structures of all currently known structures. will be.

Accordingly, other examples or modifications of the present invention can be easily created by anyone who is engaged in the technical field to which the present invention belongs, using the basic concept of the present invention. Moreover, the scope of the present invention should not be determined by the above detailed description, but should be determined by the appended claims.

1 is a view conceptually illustrating a pixel structure of a conventional reflective transmissive liquid crystal display device;

2 conceptually illustrates a pixel structure of a liquid crystal display device according to the present invention;

3 is a cross-sectional view illustrating a pixel structure of a liquid crystal display device according to a first embodiment of the present invention.

4 is a cross-sectional view illustrating a pixel structure of a liquid crystal display device according to a second embodiment of the present invention.

5 is a graph showing the reflectance in the reflection mode of the liquid crystal display device according to the present invention and the conventional liquid crystal display device.

6 is a graph showing the transmittance of the liquid crystal display device and the conventional liquid crystal display device according to the present invention.

Claims (8)

A plurality of R (Red), G (Green), and B (Blue) pixels of a transmissive type; And Consists of a plurality of W (white) pixels of the reflective type, And the R, G, B, and W pixels are arranged in a quadrangular shape. 2. The pixel of claim 1, wherein the R, G, and B pixels are formed of a first substrate, a second substrate, a thin film transistor formed on the first substrate, a first insulating layer formed on the entire substrate on which the thin film transistor is formed, and the first insulation. A common electrode and a pixel electrode formed on the layer to form an electric field substantially parallel to the surface of the first substrate, a black matrix formed on the second substrate to block light, and R, G, and B colors formed on the second substrate The W layer is formed of a filter layer, and the W pixel is formed on the thin film transistor formed on the first substrate, the second insulating layer formed on the entire substrate on which the thin film transistor is formed, and holds an embossing pattern, and the light formed on and incident on the second insulating layer. A reflective layer for reflecting the light, the first insulating layer formed on the reflective layer; And a common electrode and a pixel electrode formed on the first insulating layer to form an electric field substantially parallel to the surface of the first substrate, and a black matrix formed on the second substrate to block light. . 2. The pixel of claim 1, wherein the R, G, and B pixels are formed of a first substrate, a second substrate, a thin film transistor formed on the first substrate, a first insulating layer formed on the entire substrate on which the thin film transistor is formed, and the first insulation. A first electrode formed over the entire image display area of the layer, a second insulating layer formed on the first insulating layer on which the first electrode is formed, and a second electrode formed on the second insulating layer to form a fringe field with the first electrode. And a black matrix formed on the second substrate to block light, and an R, G, and B color filter layer formed on the second substrate, wherein the W pixel includes a thin film transistor and a thin film transistor formed on the first substrate. A third insulating layer formed over the substrate and having an embossing pattern, a reflective layer formed on the third insulating layer to reflect incident light, a first insulating layer formed on the reflective layer, and an image display of the first insulating layer A first electrode formed over the entire region, a second insulating layer formed on the first insulating layer on which the first electrode is formed, a second electrode formed on the second insulating layer to form a fringe field with the first electrode, and the second electrode And a black matrix formed on the substrate to block light. According to claim 2 or 3, wherein the thin film transistor, A gate electrode formed on the first substrate; A gate insulating layer formed on the gate electrode; A semiconductor layer formed on the gate insulating layer; And Liquid crystal display device comprising a source electrode and a drain electrode formed on the semiconductor layer. The liquid crystal display device of claim 1 or 2, further comprising a diffusion layer formed between the first substrate and the thin film transistor to reflect and scatter light incident from the R, G, and B pixels. . 4. The liquid crystal display device according to claim 3, wherein the second electrode has a band shape. The liquid crystal display device of claim 3, wherein the second electrode is formed over the entire pixel and has a strip-shaped slit. The liquid crystal display device according to claim 1, wherein the R, G, and B pixels implement R, G, and B color images, respectively, and the W pixels implement a black and white image.
KR1020090088712A 2009-09-18 2009-09-18 Transflective liquid crystal display device KR20110031010A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107357081A (en) * 2017-09-11 2017-11-17 深圳市华星光电半导体显示技术有限公司 Reflecting type liquid crystal display panel
US9915836B2 (en) 2015-01-08 2018-03-13 Samsung Display Co., Ltd. Liquid crystal display
US9939674B2 (en) 2014-07-31 2018-04-10 Samsung Display Co., Ltd. Liquid crystal display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9939674B2 (en) 2014-07-31 2018-04-10 Samsung Display Co., Ltd. Liquid crystal display device
US10067374B2 (en) 2014-07-31 2018-09-04 Samsung Display Co., Ltd. Liquid crystal display device
US9915836B2 (en) 2015-01-08 2018-03-13 Samsung Display Co., Ltd. Liquid crystal display
CN107357081A (en) * 2017-09-11 2017-11-17 深圳市华星光电半导体显示技术有限公司 Reflecting type liquid crystal display panel
WO2019047384A1 (en) * 2017-09-11 2019-03-14 深圳市华星光电半导体显示技术有限公司 Reflective liquid crystal display panel
US10509282B2 (en) 2017-09-11 2019-12-17 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Reflective LCD panel having reflective red sub-pixel, reflective green sub-pixel, reflective blue sub-pixel, and reflective white sub-pixel separated by black matrix

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