KR20090043843A - Dual view liquid crystal display device - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure of a dual view liquid crystal display device capable of preventing unbalance of luminance between different images having different viewing angles, and capable of raising the luminance without reducing the viewing angle. Another object is to provide a device.

In order to achieve the above object, a dual view liquid crystal display according to an exemplary embodiment of the present invention may be arranged such that a plurality of first pixels displaying a first image and a pair of data lines are adjacent to each other between the first pixels. A display panel having a plurality of second pixels displaying a second image, a black matrix layer formed to correspond to boundaries between the first pixels and the second pixels,

A barrier member disposed on the front surface of the display panel and having a transmission portion through which light passes and a barrier portion through which light is blocked, so that the first image and the second image have a viewing angle in different directions. ,

The barrier part may be formed such that window regions through which light is transmitted in the first pixel and the second pixel are symmetric with each other.

Dual view liquid crystal display, viewing angle, brightness, barrier

Description

Dual View Liquid Crystal Display Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual view liquid crystal display, and more particularly, to a dual view liquid crystal display for solving an imbalance in luminance between images independently implemented according to the direction of left and right viewing angles.

The present invention relates to a liquid crystal display, and more particularly, to a dual view liquid crystal display for implementing different images according to left and right viewing angles.

BACKGROUND ART With the development of the information society, various flat panel display devices are in the spotlight in place of the conventional CRTs for displaying visual information.

Such flat panel display devices include plasma display panels (PDPs), field emission display devices (FEDs), liquid crystal display devices (LCDs), and organic light emitting diodes (OLEDs), among which display screens of mobile phones and computer monitors. To liquid crystal display (LCD), which is used in various fields, ranging from display screens to large TVs, may be said to be the most representative flat panel display device.

Such a liquid crystal display implements an image using liquid crystal molecules having intermediate properties between a liquid phase having a fluidity and a solid phase having a crystalline state.

That is, since the optical properties and dielectric constants of the liquid crystal molecules along the short axis direction and the long axis direction are different from each other, the desired image is realized by controlling the light transmittance by varying the arrangement direction of the liquid crystal molecules according to the electric field.

More specifically, the liquid crystal display device includes a liquid crystal panel in which a thin film transistor array substrate and a color filter substrate are bonded to each other with a liquid crystal layer interposed therebetween, and a plurality of pixels arranged in a matrix form.

The thin film transistor array substrate includes a gate line and a data line formed to cross each other on the substrate to define a pixel region, a thin film transistor formed at an intersection of the gate line and the data line, and a thin film transistor connected to the thin film transistor. The pixel electrode is formed.

The color filter substrate includes a black matrix formed in a matrix so as to define a pixel region on the substrate, and a color filter formed in the pixel region.

Such a liquid crystal display has been designed as a single view liquid crystal display in which multiple users simultaneously view the same image on different screens at different angles. However, there are many cases where it is desirable to allow different users to view different information on one screen.

For example, a driver may want to view navigation information, but a passenger in a passenger seat may want to view entertainment information such as a movie.

As described above, when a plurality of images are implemented by dividing a single screen to satisfy conflicting demands of various users, the size of the video image is too small, and a plurality of display devices may be provided according to the user's request. The problem arises when space and cost increase.

In order to solve the above problem, in order to implement different images according to the direction of the left and right viewing angles on one display screen, a parallax optic apparatus is used to create parallaxes of images according to the viewing angles, such as a barrier member. A dual view liquid crystal display device has been proposed.

In more detail, the conventional dual view liquid crystal display device,

A display panel configured to bond the thin film transistor array substrate and the color filter substrate between the liquid crystal layer to realize the first image and the second image; It is configured to include a barrier member to have different directions,

The barrier member is formed such that a transmission portion through which light is transmitted and a barrier portion through which light is blocked are alternately disposed.

Referring to the accompanying FIG. 1, a conventional dual view liquid crystal display will be described in more detail.

1 is a plan view of a conventional dual view liquid crystal display from a front view.

As can be seen in FIG. 1, a plurality of gate lines Gm and Gm ₊₁ formed on the thin film transistor array substrate to be substantially parallel to each other, and pixel regions 135a and 135b are defined to cross the gate lines. And a plurality of data lines D _{R _2 n-1} , D _{R _2 n} , D _{L _2n-1} , D _{L _2n} formed to be substantially parallel to each other, and a thin film transistor unit formed at an intersection of the gate line and the data line ( TR) is formed.

In this case, the data lines are formed to be parallel to each other with one pixel area interposed therebetween, and the first pixel 135a and the second pixel 135b disposed to be adjacent to each other on the left and right with respect to one data line are different from each other. That is, the first image and the second image are implemented.

In other words, the first video signal the data lines (D _{R _2n-1,} D _{R _2n)} and a second data line for supplying a second video signal (D _{L _2n-1,} D _{L _2n)} for feeding are arranged to alternate with each other .

In addition, the color filter substrate includes a black matrix layer 170 formed in a matrix so as to correspond to the pixel region, and color filters R, G, and B formed in a region corresponding to the pixel region.

In the drawings, only the black matrix layer 170 in the vertical direction is illustrated for convenience of description, and in reality, the black matrix layer is formed to correspond to the upper portion of the gate line, the data line, and the thin film transistor unit instead of the region in which the liquid crystal is actually driven. Block unnecessary light from passing through

In addition, a barrier member is provided on the color filter substrate to allow the first image and the second image to have different viewing angles.

The barrier member may be formed such that a transmission part 315 through which light is transmitted and a barrier part 310 through which light is blocked are alternately formed, and the barrier part overlaps with the data line.

In addition, the first pixel and the second pixel are disposed on the left side and the right side with respect to the barrier unit 310, and have a window area that is not blocked by the barrier unit, respectively. That is, the light transmitted through the first pixel and the second pixel is transmitted through the window area so that the user can recognize the image.

However, in the conventional dual view liquid crystal display device, the barrier part of the barrier member is disposed to overlap the boundary between two adjacent pixel areas arranged on the left and right with respect to one data line.

In this case, as shown in FIG. 1, the area of the window area opened in the first pixel disposed on the left side and the window area opened in the second pixel disposed on the right side are not equal to each other.

In more detail, the thin film transistor unit is formed at the intersection of the gate line and the data line in each pixel. In the conventional dual view liquid crystal display, the thin film transistor unit is not included in the window area of the first pixel, whereas the second thin film transistor unit is disposed in the second region. The thin film transistor unit is included in the window region of the pixel.

In the region corresponding to the thin film transistor unit, since light is actually blocked by the black matrix layer, a difference occurs between the areas of the window region through which the light is transmitted in the first pixel and the second pixel.

The difference in the area of the window area causes an unbalance in luminance between the image displayed by the first pixel and the image displayed by the second pixel as shown in FIG. 2.

For reference, Figure 2 is a graph comparing the luminance according to the viewing angle between the two images,

Series 1 (# 1) has a case where the width of the window region of the first pixel and the second pixel is 7.0 μm, and series 2 (# 2) has a case where the width of the window region of the first pixel and the second pixel is 2.3 μm. Is shown.

In order to solve this problem, an object of the present invention is to provide a structure of a dual view liquid crystal display device that can prevent the unbalance of luminance between different images having different viewing angles.

In addition, another object of the present invention is to provide a dual view liquid crystal display device capable of increasing luminance without decreasing a viewing angle.

In order to achieve the above object, a dual view liquid crystal display device according to an embodiment of the present invention,

A plurality of first pixels for displaying a first image and a plurality of second pixels disposed to be adjacent to each other with the first pixel and a pair of data lines to display a second image, and the first pixels and the second pixels. A display panel having a black matrix layer formed to correspond to the boundary portion;

A barrier member disposed on the front surface of the display panel and having a transmission portion through which light passes and a barrier portion through which light is blocked, so that the first image and the second image have a viewing angle in different directions. ,

The barrier part may be formed such that window regions through which light is transmitted in the first pixel and the second pixel are symmetric with each other.

The dual view liquid crystal display device according to the present invention,

Luminance generated according to the left and right viewing angles by forming symmetrical areas of the window area which is opened in the pixel implementing the first image and the light is transmitted and the window area which is opened in the pixel implementing the second image and the light is transmitted. It provides the effect of solving the imbalance problem.

In addition, the present invention provides an effect of increasing the luminance without reducing the viewing angle or reducing the number or current consumption of the light emitting lamps while maintaining the same viewing angle.

Next, a specific embodiment of the present invention will be described in detail.

The dual view liquid crystal display device according to the embodiment of the present invention,

A display panel composed of a thin film transistor array substrate and a color filter substrate bonded between liquid crystal layers, and a barrier member provided on one side of the display panel,

The display panel includes a plurality of first pixels displaying a first image and a plurality of second pixels arranged to neighbor the first pixel and a pair of data lines to display a second image.

Referring to FIG. 3, a dual view liquid crystal display according to an exemplary embodiment of the present invention will be described in detail.

As shown in FIG. 3, the dual view liquid crystal display according to the exemplary embodiment of the present invention,

A plurality of first pixels 435a for displaying a first image and a plurality of second pixels 435b for displaying a second image by being disposed to be adjacent to each other between the first pixel and the pair of data lines 410a and 410b. And a barrier member disposed on one side of the display panel to allow the first image and the second image to have a viewing angle in different directions.

The barrier member includes a transmission part 615 through which light is transmitted and a barrier part 610 formed by alternating with the transmission part, and blocking the light. The barrier part is opened in the first and second pixels to transmit light. The window areas are formed to be symmetrical with each other.

Although not shown, the display panel is formed of a thin film transistor array substrate and a color filter substrate bonded between liquid crystal layers.

The thin film transistor array substrate may include a gate line G _m and G _{m +1} formed to be substantially parallel to each other, a first data line 410 a defining a first pixel 435 a to cross the gate line, and A second data line 410b formed to directly face the first data line 410a to define a second pixel 435b, and formed at an intersection of the gate line, the first data line, and the second data line, respectively. The first thin film transistor unit TR1 and the second thin film transistor unit TR2 are included.

Although not shown, the first thin film transistor unit and the second thin film transistor unit may include

Electrons move between the source electrode and the drain electrode by a gate electrode formed to branch from a gate line, a source electrode formed to branch from a data line, a drain electrode formed to face the source electrode, and a signal supplied to the gate electrode. And a gate insulating film for insulating the gate electrode.

The first pixel and the second pixel are connected to the drain electrode to charge a voltage corresponding to an image signal for a first image supplied from a first data line and an image signal for a second image supplied from a second data line. A pixel electrode (not shown) is provided.

In addition, the first pixel and the second pixel are arranged to be adjacent to each other with a pair of data lines formed to directly face each other, that is, the first data line and the second data line.

In addition, each of the first pixel and the second pixel may be formed of a first pixel line and a second pixel line formed in a direction parallel to the data line, wherein the first pixel line and the second pixel line are each other. It is arranged to alternate.

The color filter substrate may be formed to correspond to a boundary between the color filters R, G, and B formed to correspond to the first and second pixels, and a boundary between the first and second pixels to block light. It comprises a matrix layer.

In the drawings, only a vertical portion of the black matrix layer is illustrated for convenience of description, and the black matrix layer is formed to correspond to an area in which the liquid crystal is not accurately driven, such as a gate line, a data line, and a thin film transistor. It blocks the leakage of transmitted light.

In addition, the black matrix layer includes a first black matrix layer 670a having a first line width and a second black matrix layer 670b having a second line width smaller than the first line width.

The first black matrix layer and the second black matrix layer are alternately disposed in the boundary region of the first pixel and the second pixel, and the first black matrix layer is disposed to overlap the barrier portion.

The barrier member is formed such that the transmission part 615 through which light is transmitted and the barrier part 610 through which light is blocked are alternated with each other. In particular, the first pixel line and the second pixel line, and the transmission part and the barrier part are parallel to each other. Can be formed.

In addition, the barrier unit 610 is disposed to overlap the pair of data lines 410a and 410b, and the window regions through which light is transmitted in the first and second pixels are symmetrical with each other.

That is, in the dual view liquid crystal display according to the exemplary embodiment of the present invention, the first pixel displaying the first image and the second pixel displaying the second image are adjacent to each other with a pair of data lines formed to face each other. Since the thin film transistors included in the first pixel and the second pixel are also arranged to be symmetrical with respect to the pair of data lines.

Therefore, since the window areas which are not blocked by the barrier part in the first pixel and the second pixel do not include the thin film transistor part, each window area is symmetrical with respect to the barrier part and has the same area.

As described above, since the first pixel displaying the first image and the second pixel displaying the second image have the same area, the luminance unbalance problem between the two images generated due to the difference in the area of the window region through which light is transmitted. Is improved.

In addition, by not including the thin film transistor unit in the window area, the effect of increasing the aperture ratio in the dual view liquid crystal display device is substantially provided.

In addition, in the dual view liquid crystal display in which data lines are arranged in pairs at the boundary between the first pixel and the second pixel, the viewing angles of the first image and the second image are also increased.

Referring to FIG. 4 schematically showing a cross-sectional main portion of a conventional dual view liquid crystal display device, a main factor for determining luminance and viewing angle in the dual view liquid crystal display device is a width of a barrier (310 in FIG. 1). (W), the distance L between the barrier portion and the distance S between the barrier portion and the black matrix layer BM (170 in FIG. 1),

In order to increase the viewing angle, the width W of the barrier part must be increased, and the distance L between the barrier parts must be increased to increase the luminance.

However, in the conventional dual view liquid crystal display device, when the width W of the barrier is increased to increase the viewing angle of each image, the area of the window area through which light is transmitted is reduced, resulting in a decrease in luminance.

When the distance L between the barrier parts is increased to increase the luminance, the effective viewing angle of each image decreases.

In more detail, as shown in FIG. 5, the dual view liquid crystal display includes a primary maximum point A and B at a viewing angle where the viewing angle curve Ι of the first image and the viewing angle curve II of the second image are different from each other. ), Which means that the direction of each field of view of each image is different from each other. For reference, the horizontal axis represents left and right viewing angles, and the vertical axis represents luminance at each viewing angle although not shown.

In addition, the region C may not be accurately implemented because the two images interfere with each other to a certain extent in the left and right L and R directions with respect to the front surface O.

In addition, as shown in FIG. 5, the viewing angle curve of each image has secondary maximum points A ′ and B ′, and each image also interferes with each other around the secondary maximum point so that the image is not accurately implemented.

Therefore, each image has an effective viewing angle range (D, D ') excluding an area where the image is not properly implemented due to interference around the first and second maximum points.

When the distance L between the barrier parts is increased, the luminance of each image is simultaneously increased to increase the area causing interference, thereby reducing the effective viewing angle range.

On the other hand, in the dual view liquid crystal display according to the exemplary embodiment of the present invention, since the barrier unit and the pair of data lines are disposed to overlap each other,

As shown in FIG. 6 schematically showing a cross-sectional main part of the dual view liquid crystal display according to the exemplary embodiment of the present invention, the width of the black matrix layer of the color filter substrate is not constant.

That is, the width B ′ of the black matrix layer (670a of FIG. 3) overlapping the barrier portion (610 in FIG. 3) is the width B ′ of the black matrix layer (670b of FIG. 3) not overlapping the barrier portion (610b in FIG. 3). Wider.

As such, the width W ′ of the barrier portion, the distance L ′ between the barrier portion, and the distance S ′ between the barrier portion and the black matrix layer BM may be the same as those of the conventional dual view liquid crystal display device. Occation,

As the width B of the black matrix layer overlapping the barrier portion increases, the area where no other image is visible increases, so the range of the effective viewing angle also increases.

In addition, the luminance is determined by the area E of the region not blocked by the black matrix layer and the barrier portion.

Since the width B ′ of the black matrix layer not overlapping with the barrier portion is reduced or equal, the dual view liquid crystal display according to the exemplary embodiment of the present invention provides an effect of increasing the effective viewing angle range without losing luminance. do.

In addition, in the dual view liquid crystal display according to the exemplary embodiment of the present invention, if the viewing angle is maintained at the same level as the conventional dual view liquid crystal display, the distance between the barrier portion and the black matrix layer BM may be increased. It provides the effect of increasing the brightness at the viewing angle level. For reference, the distance passing between the barrier part and the black matrix layer and the luminance tend to be proportional to the viewing angle.

In addition, the dual view liquid crystal display according to the exemplary embodiment of the present invention may use a quad structure instead of a stripe structure in which the color filters of the same color described above are arranged in a line shape. It may have, and is not limited by the structure of the color filter.

In addition, it will be possible if the color filter is composed of three colors of red, green, blue, or four colors of red, green, blue, and white.

In addition, the dual view liquid crystal display according to the exemplary embodiment of the present invention is the same as the single view liquid crystal display since the pixels included in the display panel are divided into pixels displaying the first image and pixels displaying the second image. In order to realize the resolution, it is desirable to double the number of pixels in the data line direction.

That is, in order for each image to have the same resolution as that of the single view liquid crystal display having the resolution of UXGA (Ultra-XGA, 1600 × 1200), the dual view liquid crystal display according to the exemplary embodiment of the present invention is 3200. It would be desirable to have a resolution of x1200.

On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

1 is a plan view of a conventional dual view liquid crystal display device.

2 is a graph showing luminance according to left and right viewing angles of respective images in a conventional dual view liquid crystal display;

3 is a plan view of a dual view liquid crystal display device according to an embodiment of the present invention;

4 is a schematic cross-sectional view of principal parts of a conventional dual view liquid crystal display;

5 is a graph for explaining an effective viewing angle of each image.

6 is a schematic cross-sectional view of principal parts of a dual view liquid crystal display according to an embodiment of the present invention;

 <Description of Symbols for Main Parts of Drawings>

TR: thin film transistor section TR1: first thin film transistor

TR1: second thin film transistor 32: microcapsule

D _{R _2n-1} , D _{R _2n} : Data line for supplying the first video signal

D _{L _2n-1} , D _{L _2n} : Data line for supplying the second video signal

Gm, Gm ₊₁ : gate line 135a, 435a: first pixel region

135b and 435b: second pixel region 170: black matrix layer

315, 615: transmissive portion 310, 610: barrier portion

410a: first data line 410b: second data line

670a: first black matrix layer 670b: second black matrix layer

Claims (6)

A plurality of first pixels for displaying a first image and a plurality of second pixels disposed to be adjacent to each other with the first pixel and a pair of data lines to display a second image, and the first pixels and the second pixels. A display panel having a black matrix layer formed to correspond to the boundary portion; And And a barrier member disposed on the front surface of the display panel and including a barrier unit through which light is transmitted and a barrier unit through which light is blocked, so that the first image and the second image have different viewing angles in different directions. , And wherein the barrier unit is formed such that window regions through which light is transmitted from the first pixel and the second pixel are symmetric with each other. The method of claim 1, The pair of data lines includes a first data line for supplying a first image signal and a second data line for supplying a second image signal, And a dual view liquid crystal display overlapping the barrier portion. The method of claim 2, And the barrier part overlaps the first thin film transistor electrically connected to the first data line and the second thin film transistor electrically connected to the second data line. The method of claim 1, The black matrix layer includes a first black matrix layer having a first line width, and a second black matrix layer having a second line width smaller than the first line width. And the first black matrix layer is disposed to overlap the barrier part. The method of claim 4, wherein And the first black matrix layer and the second black matrix layer are formed alternately with each other. The method of claim 1, And the first pixel line and the second pixel line are each composed of a first pixel line and a second pixel line arranged in a line shape, and the two pixel lines are alternately arranged with each other.

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