TWI381210B - Transflective type liquid crystal display device - Google Patents

Description

Reflective-transmissive liquid crystal display device

The present invention relates to a liquid crystal display (LCD) device, and more particularly to a reflective-transmissive (transmissive-reflective) liquid crystal display device to solve the problems caused in a double cell gap.

Generally, liquid crystal display (LCD) devices are driven by optical anisotropy and polarization of liquid crystals. The liquid crystal molecules are aligned by directional characteristics because the liquid crystal molecules each have a long and thin shape. In this aspect, an induced electric field is applied to the liquid crystal, thereby controlling the alignment direction of the liquid crystal molecules.

Therefore, if the alignment direction of the liquid crystal molecules is controlled by the induced electric field, the light is polarized and changed by the optical anisotropy of the liquid crystal, thereby displaying a picture image.

The liquid crystal display (LCD) device includes: a thin film transistor array substrate, providing a thin film transistor and a pixel electrode; a color filter array substrate providing a color filter layer; and a liquid crystal layer formed at the Between the two substrates.

Recently, an active matrix (AM) type liquid crystal display (LCD) device has great appeal due to its high resolution and good picture quality, wherein the AM type liquid crystal display (LCD) device is included and arranged in In a matrix structure: a thin film transistor, and a pixel electrode.

The liquid crystal display (LCD) device does not emit light by itself. As a result, an additional light source, such as a backlight unit, must be used in a liquid crystal display (LCD) device. However, the amount of light passing through the liquid crystal display (LCD) device accounts for approximately 7% of the total amount of light emitted in the backlight unit. Therefore, a liquid crystal display (LCD) device having high luminance requires a large amount of light so as to increase power consumption of the backlight unit. In order to provide sufficient power to drive the backlight unit, it is necessary to utilize a huge battery. However, the operating time of a backlight unit using a battery is very limited.

In a bright environment, it is difficult to recognize an image displayed on the liquid crystal display (LCD) device.

Therefore, a reflection-transmission liquid crystal display (LCD) device has been actively researched and developed which is capable of using both the ambient light and the light emitted from the backlight unit. The reflective-transmission liquid crystal display (LCD) device includes a unit pixel region, wherein each unit pixel has a transmissive portion and a reflective portion.

In a reflective portion of a reflective-transmission liquid crystal display (LCD) device, the ambient light or light emitted from the backlight unit passes through the liquid crystal layer, and then reflects again through the liquid crystal layer, thereby The light passes through the liquid crystal layer twice. For the transmissive portion of a reflective-transmission liquid crystal display (LCD) device, the light passes through the liquid crystal layer once. Therefore, if the same voltage is applied to the reflected and transmitted portions, no image is displayed. In this aspect, the reflective-transmission liquid crystal display (LCD) device must provide a dual cell gap structure in which the cell gap of the transmissive portion is different from the cell gap of the reflective portion. That is, by forming a passivation layer having a different thickness in the transmissive portion and the reflective portion, the cell gap (CG2) of the transmissive portion is approximately twice the cell gap (CG1) of the reflective portion.

In a vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device, a multi-domain is formed by forming a pattern of slits in a pixel or a common electrode, and a color filter array substrate is used. A cover layer formed on a reflective portion to achieve a dual cell gap structure.

A vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device in the prior art will be described below with reference to FIG.

1 is a cross-sectional view of a vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device in a prior art.

As shown in FIG. 1, a vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device in the prior art includes: a unit cell divided into a reflective portion and a transmissive portion. Wherein a cell gap of the reflective portion is different from a cell gap of the projected portion, such a structure is referred to as a dual cell gap structure.

That is, the first substrate 10 and the second substrate 30 are disposed opposite to each other, and a liquid crystal layer 50 is formed between the first substrate 10 and the second substrate 30. Then, a backlight unit (not shown) is disposed under the first substrate 10, wherein the backlight unit emits light.

The first substrate 10 includes: a gate line and a data line (not shown) that intersect each other to define a pixel area; a thin film transistor (not shown) that forms adjacent the data line and the gate An intersecting portion of the line; a passivation layer (not shown) formed on the thin film transistor; a reflective sheet 11 formed on the passivation layer of the reflective portion to reflect the ambient light (natural Or an artificial light); an insulating layer 12 formed on an entire surface of the reflective sheet 11; a transparent material pixel electrode 13 formed on the insulating layer 12 and connected to a drain electrode of the thin film transistor.

The pixel electrode 13 is provided with an elongated pattern 13a, and the unit pixel area is divided into a plurality of fields.

Next, the second substrate 30 includes: an R/G/B color filter layer 32 for representing a color; a common electrode 34 is formed on the R/G/B color filter layer 32; And a cover layer 36 formed on the common electrode 34 of the reflective portion.

In the reflective portion, the ambient light passes through the liquid crystal layer 50 at the second substrate 30, and then on the reflective sheet 11, and passes through the liquid crystal layer 50 again, thus Light passes through the liquid crystal layer 50 twice. For the transmissive portion, the light passes through the liquid crystal layer once. In this case, since the cell gap (g1) of the reflective portion is different from the cell gap (G2) of the transmissive portion, the voltage properties of the transmissive portion and the reflective portion are controlled by the formation of the reflective portion. The thickness of the cover layer 36 on the common electrode 34 coincides with each other.

However, vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) devices in the prior art have the following disadvantages.

First, the process of depositing the cover layer must be performed, and only the cover layer remaining on the reflective portion is patterned.

Moreover, when an alignment layer is deposited on the entire surface of the substrate including the cover layer and a rubbing process is performed, a gap is formed between the transmissive portion and the reflective portion due to the cover layer, thereby Friction may occur.

Accordingly, the present invention is directed to a reflective-transmissive liquid crystal display (LCD) device that substantially obviates one or more problems due to limitations and disadvantages in the prior art.

It is an object of the present invention to provide a reflective-transmission liquid crystal display (LCD) device having a single cell gap structure having a same cell gap due to a lower driving voltage, wherein the reflective portion and the transmissive portion have the same cell gap, wherein An open pattern causes an edge region field to be formed in the pixel electrode or the common electrode of the reflective portion.

Additional advantages, objects, and features of the invention will be set forth in part in the description which And learned. The objectives and other advantages of the invention may be realized and obtained in the form of the description and the appended claims.

In order to achieve such objects and other advantages in accordance with the purpose of the present invention, as embodied and broadly described herein, a reflective-transmission liquid crystal display (LCD) device includes: a unit pixel region, divided into a reflective portion and transmitted. a portion comprising a first substrate and a second substrate facing each other; a pixel electrode formed in the pixel region of the first substrate; a reflective sheet formed in the reflective portion of the first substrate; a common electrode formed On the second substrate; at least one first open pattern shape formed in at least one of the pixel electrode and the common electrode, thereby forming a plurality of regions; and a plurality of second open patterns formed on the pixel electrode And a reflective portion of at least one of the common electrodes to cause a fringe field.

The above general description and the following detailed description are intended to be illustrative and illustrative, and are intended to provide a further explanation of the claimed invention.

The accompanying drawings, which are included to provide a further understanding of the invention .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail, and examples thereof are illustrated in the accompanying drawings. Where possible, the same reference numbers are used in the drawings to refer to the same or the like.

Hereinafter, the reflection-transmission liquid crystal display (LCD) device according to the present invention will be described with reference to the accompanying drawings.

Embodiment 1

2 is a cross-sectional view of a vertical alignment mode (VA) reflective-transmission liquid crystal display (LCD) device in accordance with a first embodiment of the present invention. Fig. 3A is a plan view showing the common electrode formed in the reflective portion of the reflection-transmission liquid crystal display (LCD) device of Fig. 2. Fig. 3B is a plan view showing the pixel electrode formed in the reflective portion of the reflection-transmission liquid crystal display (LCD) device of Fig. 2. 3C is a plan view illustrating the common electrode and the pixel electrode joined to each other in FIGS. 3A and 3B.

As shown in FIG. 2, the reflective-transmission liquid crystal display (LCD) device according to the first embodiment of the present invention includes: a first substrate 100 and a second substrate 110 facing each other; and a liquid crystal layer 150 is formed between the first substrate 100 and the second substrate 110. Then, each pixel electrode region is divided into: a reflective portion and a transmissive portion. Moreover, a backlight unit (not shown) is disposed under the first substrate 100.

The first substrate 100 corresponds to a thin film transistor substrate, and includes: a plurality of gate lines and data lines (not shown) intersecting each other to define a pixel region; and a plurality of thin film crystals (not shown) each forming a phase Adjacent to the intersection of the gate line and the data line.

At this time, each of the thin film transistors includes: a gate electrode protruding from the gate line; a gate insulating layer covering the gate electrode; and a semiconductor layer formed on the gate electrode And a source electrode and a drain electrode are formed on both sides of the semiconductor layer, wherein the source electrode protrudes from the material.

Then, a passivation layer (not shown) is formed on the entire surface of the first substrate 100 including the thin film transistor. Further, a reflective sheet 101 is formed on the passivation layer of the reflective portion to reflect and emit ambient light. Then, an insulating layer 102 is formed on the entire surface of the reflective sheet 101.

Each of the pixel regions described above is formed on the insulating layer 102 of the first substrate 100, and the pixel electrode 104 is electrically connected to the drain electrode of the thin film transistor. At this time, the pixel electrode 104 is composed of a first open pattern 115a, such as a slit or a hole, and the unit pixel region is divided into a plurality of fields.

The reflective sheet 101 is electrically connected to the drain electrode of the thin film transistor, and the pixel electrode 104 is electrically connected to the reflective sheet 101.

The second substrate 110 corresponds to a color filter substrate, and includes: a black matrix layer (not shown) corresponding to a portion other than the pixel region of the first substrate; an R/G/B A color filter layer 112, which represents various colors corresponding to the pixel regions, and a common electrode 114 formed on the R/G/B color filter layer 112.

For the common electrode 114, the common electrode 114 of the reflective portion includes a plurality of second open patterns 115b, such as slits or holes, to reduce the driving voltage by reducing an effective electric field having an induced fringe field.

The common electrode 114 of the reflective portion is composed of a plurality of second open patterns 115b. Therefore, even if the same voltage is applied to the reflective portion and the transmissive portion, a single-gap reflective-transmission liquid crystal display (LCD) device can be realized by different birefringence (?nef).

At this time, the density of the second open pattern 115b formed in the common electrode 114 formed in the reflective portion is greater than the density of the first open pattern 115a. Moreover, the interval (b) between the adjacent two second opening patterns 115b of the common electrode 114 beads disposed in the reflective portion is smaller than: the interval (a) between the adjacent two first opening patterns 115a to Form the field. If the interval (b) between the adjacent first open patterns 115a is about 6 to 10 μm, the interval (b) between the adjacent two second open patterns 115b is designed to be about 1 to 5 μm.

With the second open pattern 115b, this effective electric field reduces the fringe field without forming multiple fields. Therefore, the transmissive portion has an operational characteristic of Δnd = λ/2, and the reflective portion has an operational characteristic of Δnd = λ / 4.

4A and 4B are isobaric diagrams of the simulated reflection portion and the transmission portion in the reflection-transmission liquid crystal display (LCD) device according to the first embodiment of the present invention. Figure 5 is a comparison of a driving voltage (B) of a reflective-transmission liquid crystal display (LCD) device of the present invention, and a driving voltage (B') of a reflective-transmission liquid crystal display (LCD) device of the prior art. The pattern.

As shown in Figs. 4A and 4B, the transmissive portion of the reflection-transmission liquid crystal display (LCD) device according to the present invention is the same as the transmissive portion in the prior art. Here, in the reflection portion of the reflection-transmission liquid crystal display (LCD) device of the present invention, a fringe field of the equipotential line is generated, thereby reducing the effective electric field. Therefore, even if the same voltage (5 V) is applied to the transmissive portion and the reflective portion, the tilt of the liquid crystal molecules in the transmissive portion becomes larger.

As shown in FIG. 5, when the driving voltage (B) of the reflective-transmission liquid crystal display (LCD) device is included, which includes the common electrode 114 provided with the second open pattern 115b, and the prior art The reflection-transmission liquid crystal display (LCD) according to the present invention when the driving voltage (B') of the reflection-transmission liquid crystal display (LCD) device is included, which includes a common electrode having no open pattern. The driving voltage (B) of the device is increased more than the driving voltage (B') of the reflective-transmission liquid crystal display (LCD) device in the prior art.

In this simulation, the interval between the second open patterns 115b is less than 5 μm. The transmissive portion may be displayed as a curve of VT as the interval and density of the second open pattern are changed and the open pattern is applied together on the first and second substrates.

Embodiment 2

Fig. 6 is a cross-sectional view showing a vertical alignment (VA) mode reflection-transmission liquid crystal display device in a second embodiment of the present invention.

The vertical alignment (VA) mode reflection-transmission liquid crystal display device according to the second embodiment of the present invention is similar to the vertical alignment (VA) mode reflection-transmission liquid crystal display device according to the first embodiment of the present invention. The difference is that the first opening pattern 115a of the slit or hole formed in the common electrode 114 of the transmissive portion and the pixel electrode 104 is as shown in FIG. That is, the first open pattern 115a of the pixel electrode 104 is also applied to the common electrode 114. Here, as in the same mode of the vertical alignment (VA) mode reflection-transmission liquid crystal display device in the first embodiment of the present invention, vertical alignment (VA) mode reflection in the second embodiment of the present invention - The transmissive liquid crystal display device includes a second open pattern 115b formed at a reflective portion of the common electrode 114.

Embodiment 3

Figure 7 is a cross-sectional view illustrating a vertical alignment (VA) mode reflection-transmission liquid crystal display device in accordance with a third embodiment of the present invention.

The structure of the vertical alignment (VA) mode reflection-transmission liquid crystal display device according to the third embodiment of the present invention is similar to: the vertical alignment (VA) mode reflection-transmission liquid crystal display according to the first embodiment of the present invention. The structure of the device differs in that a plurality of protrusions 116 are formed on a common electrode 114 for dividing the unit pixels into multiple fields, as shown in FIG. In the same mode as the vertical alignment (VA) mode reflection-transmission liquid crystal display device in the first embodiment of the present invention, this vertical alignment (VA) mode reflection-transmission type according to the third embodiment of the present invention The liquid crystal display device includes a second open pattern 115b formed in a reflective portion of the common electrode 114.

Embodiment 4

In the vertical alignment (VA) mode reflection-transmission liquid crystal display device according to the first embodiment of the present invention, the second open pattern is formed in a common electrode of the reflective portion. In order to have the same effect, the second open pattern may be formed in the pixel electrode of the reflective portion.

In the vertical alignment (VA) mode reflection-transmission type liquid crystal display device according to the third embodiment of the present invention, the second open pattern is formed in the pixel electrode of the reflective portion.

Figure 8 is a cross-sectional view illustrating a vertical alignment (VA) mode reflection-transmission liquid crystal display device in accordance with a fourth embodiment of the present invention. Fig. 9A is a plan view showing a pixel electrode of a transmissive portion in a vertically aligned (VA) mode reflection-transmission type liquid crystal display device in Fig. 8. Fig. 9B is a plan view showing a pixel electrode of a reflection portion in a vertically aligned (VA) mode reflection-transmission type liquid crystal display device in Fig. 8.

This explanation for the vertical alignment (VA) mode reflection-transmission liquid crystal display device according to the fourth embodiment in the present invention will use the same reference numeral in the first embodiment in the present invention, via The drawings refer to the same or similar parts. Moreover, the description of the similar portions in the first embodiment and the fourth embodiment is omitted, and the description of the fourth embodiment is focused on different structures and properties.

As shown in FIG. 8, a pixel electrode 104 is formed in each pixel region on an insulating layer 102 of the first substrate 100, wherein the pixel electrode 104 is electrically connected to a drain electrode of the thin film transistor. . In this case, the plurality of first open patterns of the slits or holes divide a unit pixel into a plurality of fields and are formed in the pixel electrode 104. Then, a plurality of second open patterns 115b are formed in a pixel electrode 104 of the reflective portion to cause a fringe field, whereby an effective electric field is reduced, and a driving voltage is lowered.

Then, a second substrate 110 of the color filter array substrate is prepared, which includes: a black matrix layer (not shown) correspondingly forming a portion other than the pixel region of the first substrate; an R/G /B color filter layer 112, which represents various colors corresponding to the pixel regions; and a common electrode 114 formed on the R/G/B color filter layer 112.

A plurality of second open patterns 115b are formed in the pixel electrode 104 of the reflective portion. Therefore, even if the same voltage is applied to the reflective portion and the transmissive portion, it is possible to realize a single-gap reflective-transmission liquid crystal display (LCD) device by different birefringence (Δneff).

At this time, the density of the second open pattern 115b formed in the pixel electrode 104 of the reflective portion is greater than the density of the first open pattern 115a. Moreover, the interval (b) between the adjacent two second open patterns 115b provided in the pixel electrode 104 of the reflective portion is smaller than the interval (a) between the adjacent two first open patterns 115a to form field. If the interval (a) between the adjacent two first open patterns 115a is about 6 to 10 μm, the interval (b) between the adjacent two second open patterns 115b may be designed to be about 1 to 5 μm. .

With the second open pattern 115b, the effective electric field reduces the fringe field without forming multiple fields. Therefore, the transmissive portion has an operational characteristic of Δnd = λ/2, and the operational characteristic of the reflective portion is Δnd = λ / 4.

The fourth embodiment of the present invention can be applied to: a vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device according to the second embodiment and the third embodiment of the present invention.

For the vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device of FIG. 6, the first open pattern 115a divides the unit pixel into a plurality of regions, and is formed at the pixel electrode And the common electrode 114, and the vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device in FIG. 7, where the first open pattern 115a divides the unit pixel into multiple fields Formed in the pixel electrode 104, and a plurality of protrusions 116 are formed on the common electrode 114, and a plurality of second opening patterns 115b of the slits or holes may be formed in the pixel electrode 104 of the reflective portion, thus resulting in the The fringe field.

Embodiment 5

In a vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device, a first open pattern including a plurality of slits or holes is formed in a common electrode, and a plurality of protrusions are formed in one The pixel electrode is formed to form a plurality of regions, and the plurality of second open patterns may be formed in the pixel electrode or the common electrode of the corresponding reflective portion, thereby forming a fringe field. This will be described below.

Fig. 10 is a cross-sectional view showing a vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device according to a fifth embodiment of the present invention.

With regard to the explanation of the vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device according to the fifth embodiment of the present invention, the same reference numerals of the first embodiment in the present invention will be used, which are via the drawings. And refers to the same or similar parts. Moreover, the description of the similar portions in the first embodiment and the fifth embodiment is omitted, and the description of the fifth embodiment is focused on different structures and properties.

As shown in FIG. 10, a pixel electrode 104 is formed in each pixel region on an insulating layer 102 of the first substrate 100, wherein the pixel electrode 104 is electrically connected to a drain electrode of the thin film transistor. . In this case, a plurality of protrusions 116 are formed on the pixel electrode 104, and a unit pixel is divided into a plurality of fields.

Then, a second substrate 110 of the color filter array substrate is prepared, which includes: a black matrix layer (not shown) correspondingly forming a portion other than the pixel region of the first substrate; an R/G /B color filter layer 112, which represents various colors corresponding to the pixel region; and a common electrode 114 formed on the R/G/B color filter layer 112.

Then, a plurality of slits or first opening patterns of the holes are formed in the common electrode 114, thereby forming the unit pixels into a plurality of fields. Moreover, a second open pattern of a plurality of slits or holes is formed in the common electrode 114 of the reflective portion to cause a fringe field, thereby reducing an effective electric field and lowering a driving voltage.

A plurality of second open patterns 115b are formed in the pixel electrodes of the reflective portion. Therefore, even if the same voltage is applied to the reflective portion and the transmissive portion, a single-gap reflective-transmission liquid crystal display (LCD) device can be realized with different birefringence (Δneff).

At this time, the density of the second open pattern 115b formed in the common electrode 114 of the reflective portion is greater than the density of the first open pattern 115a. Moreover, the interval (b) between the adjacent two second open patterns 115b provided in the common electrode 114 of the reflective portion is smaller than the interval (a) between the adjacent two first open patterns 115a to form a field. If the interval (a) between the adjacent two first open patterns 115a is about 6 to 10 μm, the interval (b) between the adjacent two second open patterns 115b is designed to be about 1~. 5 μm.

With the second open pattern 115, the effective electric field fringe field does not form multiple domains. Therefore, the transmissive portion has an operational characteristic of Δnd = λ/2, and the reflective portion has an operational characteristic of Δnd = λ / 4.

Embodiment 6

In the first to fifth embodiments of the present invention, a plurality of second open patterns may be formed in the pixel electrode and the common electrode of the reflective portion, thereby causing a fringe field. This will be explained in detail.

Figure 11 is a cross-sectional view illustrating a vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device in accordance with a sixth embodiment of the present invention.

As mentioned above, the vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device according to the present invention may include: a first open pattern of slits or holes formed at the pixel electrode or common In the electrode to achieve multiple fields; may comprise a plurality of first open patterns of slits or holes, formed in the pixel electrode and the common electrode to achieve multiple fields; or may include a plurality of first open patterns of slits or holes, forming In any one of the pixel electrode and the common electrode, and a plurality of protrusions are formed in the other pixel electrode and the common electrode.

In this configuration, a plurality of second open patterns may be formed in the pixel electrode and the common electrode of the reflective portion to cause a fringe field.

For a reflective-transmission liquid crystal display (LCD) device having the structure described above, FIG. 11 illustrates the structure of a plurality of first open patterns in the formed pixel electrode to form a plurality of domains.

As shown in FIG. 11, the reflection-transmission liquid crystal display (LCD) device according to the sixth embodiment of the present invention includes: a first substrate 100 and a second substrate 110 facing each other; and a liquid crystal layer 150 formed on Between the first substrate 100 and the second substrate 110. Then, each pixel region is divided into: a reflective portion and a transmissive portion. Further, a backlight unit (not shown) is disposed under the first substrate 100.

The first substrate 100 corresponds to a thin film transistor substrate, and includes: a plurality of gate lines and data lines (not shown) intersecting each other to define a pixel region; and a plurality of thin film transistors (not shown) adjacent to each other Formed at the intersection of the data line and the gate line.

At this time, each of the thin film transistors includes: a gate electrode protruding from the gate line; a gate insulating layer covering the gate electrode; and a semiconductor layer formed on the gate electrode And a source electrode and a drain electrode are formed on both sides of the semiconductor layer, wherein the source electrode protrudes from the data line.

Then, a passivation layer (not shown) is formed on an entire surface of the first substrate 100, including: a thin film transistor. Further, a reflective sheet 101 is formed on the passivation layer of the reflective portion to reflect ambient light. Then, an insulating layer 102 is formed on an entire surface of the reflective sheet 101.

Moreover, a pixel electrode 104 is formed in each pixel region on the insulating layer 102 of the first substrate 100, wherein the pixel electrode 104 is electrically connected to the drain electrode of the thin film transistor. In this case, a plurality of first open patterns 115a of slits or holes are formed in the pixel electrode 104, thereby dividing the unit pixels into a plurality of fields. In this case, the reflective sheet 101 is electrically connected to the drain electrode of the thin film transistor, and the pixel electrode 104 is electrically connected to the reflective sheet 101.

Moreover, a plurality of second open patterns 115b of slits or holes are formed in the pixel electrode 104 of the reflective portion to cause a fringe field, thereby reducing an effective electric field and lowering a driving voltage.

The second substrate 110 corresponds to a color filter substrate, and includes: a black matrix layer (not shown) correspondingly forming a portion other than the pixel region of the first substrate; an R/G/B color filter A slice 112 representing various colors corresponding to the pixel electrode; and a common electrode 114 formed on the R/G/B color filter layer 112.

For the common electrode 114, the common electrode 114 of the corresponding reflective portion includes a plurality of second open patterns 115b, such as slits or holes, thereby reducing the driving voltage by reducing the effective electric field having the fringe field.

A plurality of second open patterns 115b are formed in the pixel electrode 104 of the reflective portion and the common electrode 114. Therefore, even if the same voltage is applied to the reflective portion and the transmissive portion, a single-gap reflective-transmission liquid crystal display (LCD) device can be realized by different birefringence (Δneff).

At this time, the density of the second open pattern 115b formed in the pixel electrode 104 and the common electrode 114 formed in the reflective portion is larger than the density of the first open pattern 115a. Moreover, the interval (b) between the two adjacent second open patterns 115b provided in the common electrode 114 of the reflective portion is smaller than the interval (a) between the two adjacent first open patterns 115a to form a domain .

With the second open pattern 115b, this effective electric field reduces the fringe field without forming multiple fields. Therefore, the transmissive portion has an operational characteristic of Δnd = λ/2, and the reflective portion has an operational characteristic of Δnd = λ / 4.

In the sixth embodiment of the present invention, the density and interval of the second open pattern 115b may be the same or smaller than the second open pattern density and interval in the first to fifth embodiments of the present invention.

Although not shown, similar to the second to fifth embodiments of the present invention, a plurality of second open patterns are formed in the pixel electrode and the common electrode of the reflective portion, and thus are reflected-transparent in various vertical alignment (VA) modes. A fringe field is caused in a liquid crystal display (LCD) device.

Similarly, the simulations of the second to sixth embodiments of the present invention have numerical values similar to those of FIGS. 4A, 4B, and 5.

Fig. 12 is a plan view showing a second open pattern formed in various shapes.

In the first to sixth embodiments of the present invention, the second open pattern 115b is formed in the shape of an oblique line. However, as shown in Fig. 12, the second open pattern 115 varies in shape.

The pixel electrode or the common electrode of the reflective portion may be formed into a mesh shape (Fig. 12A), a horizontal or vertical line window frame (Fig. 12B), or a checkerboard (Fig. 12C). ).

With the reflection-transmission liquid crystal display (LCD) device of the single cell gap structure according to the present invention, it is not necessary to perform the step of forming a cap layer, thereby simplifying the manufacturing process. Therefore, the open pattern is formed in the pixel electrode or the common electrode of the reflective portion, and thus the voltage characteristic of the reflective portion is similar to the voltage characteristic of the transmissive portion.

As mentioned above, this reflection-transmission liquid crystal display (LCD) device according to the present invention has the following advantages.

First, the reflective portion has an operational characteristic of Δnd = λ / 4 without forming the cover layer, thereby simplifying the process.

Since the cover layer is not formed, a single gap can be achieved without a gap difference to reduce the 瑕疵 alignment. Thus, the yield is improved and the manufacturing cost is lowered.

It will be apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention include such modifications and variations of the invention in the scope of the appended claims.

10‧‧‧First substrate

11‧‧‧Reflective sheet

12‧‧‧Insulation

13‧‧‧pixel electrode

13a‧‧‧Slim pattern

30‧‧‧second substrate

32‧‧‧R/G/B color filter layer

34‧‧‧Common electrode

36‧‧‧ Coverage

50‧‧‧Liquid layer

100‧‧‧First substrate

101‧‧‧reflective sheet

150‧‧‧Liquid layer

102‧‧‧Insulation

104‧‧‧pixel electrode

110‧‧‧second substrate

112‧‧‧R/G/B color filter layer

114‧‧‧Common electrode

115a‧‧‧first open pattern

115b‧‧‧Second open pattern

116‧‧ ‧ protrusions

G1‧‧‧cell gap

G2‧‧‧cell gap

△neff‧‧‧birefringence

b‧‧‧Interval between two second open patterns 115b

a. . . The interval between the two first open patterns 115a

B. . . Driving voltage

B’. . . Driving voltage in the prior art

1 is a cross-sectional view illustrating a vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device of the prior art; and FIG. 2 is a cross-sectional view illustrating a vertical according to a first embodiment of the present invention A cross-sectional view of a (VA) mode reflective-transmission liquid crystal display (LCD) device; FIG. 3A is a plan view illustrating a reflective portion of a reflective-transmission liquid crystal display (LCD) device formed in FIG. a common electrode; FIG. 3B is a plan view illustrating a pixel electrode formed in a reflective portion of the reflective-transmission liquid crystal display (LCD) device of FIG. 2; FIG. 3C is a plan view illustrating a 3A diagram and The common electrode and the pixel electrode in FIG. 3B are bonded to each other; FIGS. 4A and 4B are equipotential diagrams of the simulated reflection and transmission portions of the reflection-transmission liquid crystal display (LCD) device according to the first embodiment of the present invention. Figure 5 is a diagram comparing a driving voltage of a reflection-transmission liquid crystal display (LCD) device in the embodiment of the present invention with a driving voltage of a reflective-transmission liquid crystal display (LCD) device in the prior art; Figure 6 is a cross-sectional view illustrating the invention in accordance with the present invention A vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device of the second embodiment; and a cross-sectional view of a vertical alignment (VA) mode reflective-transmission liquid crystal according to a third embodiment of the present invention Display (LCD) device; FIG. 8 is a cross-sectional view illustrating a vertical alignment (VA) mode reflective-transmission liquid crystal display (LCD) device according to a fourth embodiment of the present invention; FIG. 9A is a plan view illustrating 8 is a pixel electrode in a transmissive portion of a reflective-transmission liquid crystal display (LCD) device; FIG. 9B is a plan view illustrating a reflection of a reflective-transmission liquid crystal display (LCD) device in FIG. a pixel electrode in a portion; FIG. 10 is a cross-sectional view illustrating a vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device according to a fifth embodiment of the present invention; and FIG. 11 is a cross-sectional view A vertical alignment (VA) mode reflection-transmission liquid crystal display (LCD) device according to a sixth embodiment of the present invention; and FIGS. 12(a) to (e) are plan views showing the formation of various shapes Two open patterns.

100. . . First substrate

101. . . Reflective sheet

102. . . Insulation

104. . . Pixel electrode

110. . . Second substrate

112. . . R/G/B color filter layer

114. . . Common electrode

115a. . . First open pattern

115b. . . Second open pattern

150. . . Liquid crystal layer

Claims (8)

A reflection-transmission liquid crystal display (LCD) device comprising: a unit pixel region divided into a reflective portion and a transmissive portion, comprising: a first substrate and a second substrate facing each other; a pixel An electrode formed in the pixel region of the first substrate; a reflective sheet formed in the reflective portion of the first substrate; a common electrode formed on the second substrate; at least one first open pattern, Formed in at least one of the pixel electrode and the common electrode to form a plurality of regions; and a plurality of second open patterns formed only in the pixel electrode except for the transmissive portion of the pixel electrode and the common electrode The reflective portion of at least one of the common electrodes to cause a fringe field, wherein the density of the second open pattern is greater than the density of the first open pattern. The reflective-transmission liquid crystal display (LCD) device of claim 1, wherein the interval between the first open patterns is about 6-10 μm, and the interval between the second open patterns is about 1 ~5μm. The reflective-transmission liquid crystal display (LCD) device of claim 1, wherein the first open pattern and the second open pattern are formed in the shape of a slit or a hole. The reflective-transmission liquid crystal display (LCD) device of claim 1, wherein the plurality of protrusions are formed in at least one of the pixel electrode and the common electrode. The reflective-transmission liquid crystal display (LCD) device of claim 1, wherein the first substrate is a thin film transistor array substrate, and the second substrate is a color filter array substrate. The reflective-transmission liquid crystal display (LCD) device of claim 1, wherein the pixel electrode having the plurality of second open patterns and the common electrode and the common electrode are formed in a mesh shape. The reflective-transmission liquid crystal display (LCD) device according to claim 1, wherein the pixel electrode having the plurality of second open patterns and the common electrode and the common electrode are formed in a shape of a window frame. The reflective-transmission liquid crystal display (ICD) device according to claim 1, wherein the pixel electrode having the plurality of second open patterns and the common electrode and the common electrode are formed in a checkerboard shape.