KR20090054748A - Multi-view liquid crystal display device - Google Patents

Abstract

A multiview LCD is provided to improve transmittance as independently displaying different images at left, right and front viewing angles. A multiview LCD(Liquid Crystal Display) comprises a barrier substrate(101), a color filter substrate(105), an array substrate(110), RGB sub color filters, first and second thin film transistors, first and second common electrodes, and first and second LC layers. The barrier substrate, the color filter substrate and the array substrate are classified into first to third sub pixels for implementing first to third images. The RGB sub color filters are respectively corresponded to the first to third sub pixels of a lower surface of the color filter substrate. The first TFT is configured in a lower surface of the barrier substrate. A plurality of first pixel electrodes(P1) is respectively contacted with the plural first TFTs. The second TFT is configured in an upper surface of the array substrate. A plurality of second pixel electrodes(P2) is respectively contacted with the plural second TFTs. The second common electrode is alternatively disposed with the second pixel electrode. The first and the second LC layers are interposed between the color filter substrate and barrier substrate and between the color filter substrate and the array substrate.

Description

Multi-View Liquid Crystal Display Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to improving transmittance in a multi-view liquid crystal display device capable of independently displaying separate images at left, right, and front viewing angles.

Currently, active matrix LCDs (AM-LCDs) in which a thin film transistor and pixel electrodes connected to the thin film transistors are arranged in a matrix manner have attracted the most attention due to their excellent resolution and ability to implement video. The driving principle of the liquid crystal display device uses optical anisotropy and polarization property of the liquid crystal. Since the liquid crystal is thin and long in structure, the liquid crystal has directivity in the arrangement of molecules and artificially controls the direction of the molecular arrangement by applying an electric field to the liquid crystal. can do.

Accordingly, when the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal due to optical anisotropy to express image information.

However, in order to satisfy the diversified needs of consumers, it is necessary to develop a multi-view liquid crystal display device that can realize images to be formed without interfering with each other in the left, right, and front viewing angle directions.

The present invention has been made to solve the above-described problem, and an object of the present invention is to improve transmittance in a multi-view liquid crystal display device that can independently display separate images at left, right, and front viewing angles.

According to an aspect of the present invention, there is provided a multi-view liquid crystal display device comprising: a barrier substrate, a color filter substrate, each divided into first, second, and third sub-pixels for implementing first, second, and third images; An array substrate; A plurality of red, green, and blue sub color filters corresponding to each of the first, second, and third sub-pixels on the lower surface of the color filter substrate; A plurality of first thin film transistors formed on a lower surface of the barrier substrate, a plurality of first pixel electrodes in contact with the plurality of first thin film transistors, a first common electrode alternately disposed with the first pixel electrode, and ; A plurality of second thin film transistors formed on an upper surface of the array substrate, a plurality of second pixel electrodes in contact with the plurality of second thin film transistors, a second common electrode alternately disposed with the second pixel electrode, and ; And a first liquid crystal layer and a second liquid crystal layer interposed between the color filter substrate and the barrier substrate and spaced apart spaces of the color filter substrate and the array substrate, respectively.

In the triple view driving, a first control signal is applied to the first sub-pixel, a second control signal is applied to the second sub-pixel, and a third control signal is applied to the third sub-pixel. A first image displayed as a combination, a second image displayed as a combination of the second sub pixels in the left viewing angle direction, and a third image displayed as a combination of the third sub pixels in the right viewing angle direction are independently implemented. It is done.

In the dual view driving, the first sub-pixel maintains an off state, a second control signal is applied to the second sub-pixel, and a third control signal is applied to the third sub-pixel. The second image displayed by the combination of the pixels and the right view angle direction may independently implement the third image displayed by the combination of the third sub-pixels.

In one-view driving, a first control signal is applied to the first, second, and third sub-pixels to implement only a first image displayed by a combination of the first, second, and third sub-pixels. .

In this case, the first liquid crystal layer interposed between the barrier substrate and the color filter substrate selectively blocks interference between the first, second, and third images represented by a combination of the first, second, and third sub-pixels. It plays a role.

The liquid crystal interposed in the first liquid crystal layer may be controlled on / off by a horizontal electric field between the first pixel electrode and the first common electrode that correspond one-to-one to the red, green, and blue sub-pixels.

When the plurality of first common electrodes are not formed on the lower surface of the barrier substrate, a first common electrode is formed on the upper surface of the color filter substrate to form the first liquid crystal through a vertical electric field with the first pixel electrode. The layers can be driven.

When the plurality of second common electrodes are not formed on the array substrate, a second common electrode is formed on a lower surface of the color filter substrate to form the second liquid crystal layer through a vertical electric field with the second pixel electrode. A plurality of black matrices are formed to correspond to the boundary regions of the red, green, and blue sub color filters.

In the present invention, since the liquid crystal layer interposed between the color filter substrate and the barrier substrate may be selectively controlled to transmit or block light, the transmittance may be improved when the original view is implemented.

Hereinafter, a multi-view liquid crystal display device will be described with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a general multi-view liquid crystal display.

As shown in the drawing, the multi-view liquid crystal display device 90 is the color filter substrate 5 and the array substrate 10 respectively divided into the first, second, and third pixels P1, P2, and P3. The liquid crystal layer 15 is interposed between the color filters and the array substrates 5 and 10. Although not shown in the drawings, a backlight unit (not shown) serving as a light source is disposed on the rear surface of the array substrate 10.

In this case, the first, second, and third pixels P1, P2, and P3 are divided into first, second, and third sub-pixels SP1, SP2, and SP3.

The lower surface of the color filter substrate 5 has a barrier pattern 60 that shields a part of the first, second, and third pixels P1, P2, and P3, and an objective for planarization of the barrier pattern 60. The overcoat layer 65 which consists of these, and the color filter element 70 comprised below the overcoat layer 65 are located in order.

Although not shown in detail in the drawing, the color filter element 70 includes red, green, and blue sub color filters corresponding to each of the first, second, and third sub-pixels SP1, SP2, and SP3, and the red, green And a plurality of black matrices corresponding to the boundary regions of the blue sub color filter. That is, a combination of red, green, and blue sub-color filters corresponding to the first, second, and third sub-pixels SP1, SP2, and SP3, respectively, may implement an independent image in each viewing angle direction.

Although not shown in the drawings, a plurality of gate wires formed in one direction, data wires perpendicularly intersecting the gate wires in a matrix form, and intersection points of the gates and data wires are formed on an upper surface of the array substrate 10. It includes a plurality of thin film transistors, a plurality of pixel electrodes in contact with the thin film transistor, and a plurality of common electrodes disposed alternately with the plurality of pixel electrodes. In this case, when the common electrode is not formed on the array substrate 10, the common electrode is formed on the color filter substrate 5, and the liquid crystal layer 15 is formed through a horizontal electric field with the pixel electrode on the array substrate 10. It can be applied to drive the way.

The main purpose of the above-described barrier pattern 60 serves to block the interference light so that the image of each viewing angle direction is not mixed. The barrier pattern 60 uses a metal such as chromium or an opaque material of a black resin series.

2A and 2B illustrate driving states of a general multi-view liquid crystal display, and show portions corresponding to the first pixel area.

First, FIG. 2A illustrates a driving state of a triple view capable of independently implementing first, second, and third images CV, LV, and RV in left, right, and front viewing angle directions.

In the triple view driving, the first control signal is applied to the first sub-pixel SP1, the second control signal is applied to the second sub-pixel SP2, and the third control signal is applied to the third sub-pixel SP3, respectively. In the first image CV displayed by the combination of the first sub-pixel SP1, the second image LV displayed by the combination of the second sub-pixel SP2 in the left viewing angle direction, and the third sub-display in the right viewing angle direction. The third image RV displayed by the combination of the pixels SP3 may be independently implemented.

In detail, in the front viewing angle direction, only the first image CV is realized by the barrier pattern 60 that blocks light incident from the second and third sub-pixels SP2 and SP3, and in the left viewing angle direction, the first image CV is implemented. The second image LV is implemented by a barrier pattern 60 that blocks light incident from the first and third sub-pixels SP1 and SP3, and the first and second sub-pixels SP1, Only the third image RV is realized by the barrier pattern 60 that blocks light incident from the SP2.

FIG. 2B illustrates a driving state of a triple view that implements only the first image in the front viewing angle direction.

In the one-view driving, the front-view angle shows a one-view method that implements only the first image CV by using a combination of the first sub-pixels SP1 receiving the first control signal. In this case, the second and third sub-pixels SP2 and SP3 are maintained in an off state so that the second and third images (LV and RV of FIG. 2A) are not implemented.

However, the first image CV may be realized by applying the first control signal to the second and third sub-pixels SP2 and SP3 when the one-view driving of the multi-view liquid crystal display is performed. Since the region through which the light can be transmitted is limited by the barrier pattern 60, the second and third sub-pixels SP2 and SP3 are maintained in the off state.

For this reason, the multi-view liquid crystal display has a problem in that the image quality is lowered because the transmittance is reduced by about 2/3 when driving in the one view by the barrier pattern.

--- Example ---

In the present invention, the transmittance can be improved by selectively turning on / off the liquid crystal layer interposed between the color filter substrate and the barrier substrate.

Hereinafter, a multi-view liquid crystal display according to the present invention will be described with reference to the accompanying drawings.

3 is a cross-sectional view of the multi-view liquid crystal display device according to the present invention.

As illustrated, the multi-view liquid crystal display 190 according to the present invention includes a barrier substrate 101 and a color filter substrate 105 each divided into first, second, and third pixels P1, P2, and P3. And the array substrate 110 are sequentially bonded to each other.

First and second liquid crystal layers 115 and 116 are interposed in the space between the color filter substrate 105 and the barrier substrate 160 and the color filter substrate 105 and the array substrate 110. . Although not shown in the drawings, a backlight unit (not shown) serving as a light source is disposed on the rear surface of the array substrate 110.

In this case, the first, second, and third pixels P1, P2, and P3 are divided into first, second, and third sub-pixels SP1, SP2, and SP3.

The color filter element 170 is positioned on the bottom surface of the color filter substrate 105 to correspond to the first, second, and third pixels P1, P2, and P3. Although not illustrated, the color filter element 170 may include red, green, and blue sub color filters corresponding to each of the first, second, and third sub-pixels SP1, SP2, and SP3, and the red, green, and red color filters. It includes a plurality of black matrices corresponding to the boundary region of the blue sub color filter. That is, an independent image may be realized in each viewing angle region by a combination of red, green, and blue sub color filters corresponding to the first, second, and third sub pixels SP1, SP2, and SP3, respectively.

Meanwhile, a lower surface of the barrier substrate 101 may include a first gate wiring configured in one direction, a plurality of second data wirings vertically intersecting the first gate wiring in a matrix form, and the first gate wiring and the first gate wiring. And a plurality of first thin film transistors positioned at intersections of the data lines and a plurality of first pixel electrodes in contact with the first thin film transistors. The first thin film transistor has a one-to-one correspondence with red, green, and blue sub color filters.

In realizing an image through a combination of red, green, and blue sub color filters corresponding to the first, second, and third sub pixels SP1, SP2, and SP3, the control signal applied to the first thin film transistor There is an advantage in that the transmission region and the blocking region can be easily controlled by the application.

In this case, when the plurality of first common electrodes are not formed on the lower surface of the barrier substrate 110, the first common electrode is formed on the upper surface of the color filter substrate 105 to form a vertical electric field with the first pixel electrode. A method of driving the first liquid crystal layer 115 may be applied through the above.

Although not shown in the drawings, a plurality of second gate wires formed in one direction, a plurality of second data wires perpendicularly intersecting the second gate wires in a matrix form, are provided on an upper surface of the array substrate 110; A plurality of second thin film transistors configured at intersections of the second gate line and the second data line, a plurality of second pixel electrodes in contact with the second thin film transistor, and a plurality of second pixel electrodes And a plurality of second common electrodes. In this case, when the plurality of second common electrodes are not formed on the array substrate 110, a second common electrode is formed on the lower surface of the color filter substrate 105 to form a second common electrode and a second common electrode. 2 A method of driving the liquid crystal layer 116 may be applied.

4A, 4B, and 4C are diagrams illustrating driving states of the multi-view liquid crystal display according to the present invention, and show portions corresponding to the first pixel region.

First, FIG. 4A illustrates a driving state of a triple view capable of independently implementing first, second, and third images CV, LV, and RV in left, right, and front viewing angle directions.

In the triple view driving, the first control signal is applied to the first sub-pixel SP1, the second control signal is applied to the second sub-pixel SP2, and the third control signal is applied to the third sub-pixel SP3, respectively. In the first image CV displayed by the combination of the first sub-pixel SP1, the second image LV displayed by the combination of the second sub-pixel SP2 in the left viewing angle direction, and the third sub-display in the right viewing angle direction. The third image RV displayed by the combination of the pixels SP3 may be independently implemented.

In detail, in the front viewing angle direction, only the first image CV is realized by the first liquid crystal layer 115 that blocks light incident from the second and third sub-pixels SP2 and SP3. In FIG. 2, the second image LV is implemented by the first liquid crystal layer 115 that blocks light incident from the first and third sub-pixels SP1 and SP3. In the right viewing angle direction, the first and second sub-pixels are implemented. Only the third image RV is implemented by the first liquid crystal layer 115 that blocks light incident from the pixels SP1 and SP2.

That is, in the present invention, the first liquid crystal layer 115 interposed between the color filter substrate (105 in FIG. 3) and the barrier substrate (101 in FIG. 3) has a red, green and blue sub color filter on the bottom surface of the barrier substrate. The first liquid crystal layer is selectively turned on / off by a horizontal electric field between a plurality of first thin film transistors corresponding to one to one, a first pixel electrode and a first common electrode in contact with the first thin film transistor, It is characterized in that it is designed to transmit or block the light.

In other words, since the plurality of first thin film transistors are designed to correspond to the red, green, and blue sub color filters one-to-one, the plurality of first thin film transistors correspond to the first, second, and third sub-pixels SP1, SP2, and SP3, respectively. In realizing an image through a combination of green and blue sub color filters, the transmission region and the blocking region can be easily controlled by applying a control signal applied to the first thin film transistor.

In this case, when the plurality of first common electrodes are not formed on the lower surface of the barrier substrate, a plurality of first common electrodes are formed on the upper surface of the color filter substrate to form a vertical electric field between the first common electrode and the first pixel electrode. Through the on / off control of the liquid crystal 112 interposed in the first liquid crystal layer 115 it is possible to transmit or block light.

Meanwhile, FIG. 4B illustrates a driving state of a dual view capable of independently implementing second and third images LV and RV in left and right viewing angle directions.

In the dual view driving, the first sub-pixel SP1 is kept off, the second control signal is applied to the second sub-pixel SP2 and the third control signal is applied to the third sub-pixel SP3, respectively. In the viewing angle direction, the second image LV displayed as a combination of the second sub pixels SP2 and the third image RV displayed as a combination of the third sub pixels SP3 in the right viewing angle direction are independently implemented. .

In detail, since the first sub-pixel is turned off in the front viewing angle direction, the first image is not implemented. In the left viewing angle direction, the first liquid crystal layer 115 blocks light incident from the third sub-pixel SP3. ) Only the second image LV, and in the right viewing angle direction, only the third image RV may be implemented by the first liquid crystal layer 115 that blocks light incident from the second sub-pixel SP2. Will be.

In FIG. 4C, the driving state of the triple view implementing only the first image in the front viewing angle direction is illustrated.

In one-view driving, the first image CV is displayed as a combination of the first, second, and third sub-pixels SP1, SP2, and SP3 by applying a first control signal to the first, second, and third sub-pixels. ) Can only be implemented.

In this case, in the present invention, unlike the barrier pattern, light may be selectively transmitted and blocked, and thus, the transmittance may be greatly improved due to a chronic problem when the one view of the multi-view liquid crystal display is implemented.

Therefore, in the present invention, there is an advantage that the image quality can be improved by improving the transmittance.

However, the present invention is not limited to the above embodiments, and it will be apparent that various modifications and changes can be made without departing from the spirit and the spirit of the present invention.

1 is a cross-sectional view schematically showing a general multi-view liquid crystal display device.

2A and 2B illustrate driving states of a general multi-view liquid crystal display;

3 is a cross-sectional view of a multi-view liquid crystal display device according to the present invention;

4A, 4B and 4C are respective views showing the driving states of the multi-view liquid crystal display according to the present invention.

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

101 barrier substrate 105 color filter substrate

110 array substrate 115 first liquid crystal layer

116: second liquid crystal layer 170: color filter element

P1, P2, P3: first, second, third pixels

SP1, SP2, SP3: first, second and third sub pixels

Claims (9)

A barrier substrate, a color filter substrate, and an array substrate each divided into first, second, and third sub-pixels for implementing the first, second, and third images; A plurality of red, green, and blue sub color filters corresponding to each of the first, second, and third sub-pixels on the lower surface of the color filter substrate; A plurality of first thin film transistors formed on a lower surface of the barrier substrate, a plurality of first pixel electrodes in contact with the plurality of first thin film transistors, a first common electrode alternately disposed with the first pixel electrode, and ; A plurality of second thin film transistors formed on an upper surface of the array substrate, a plurality of second pixel electrodes in contact with the plurality of second thin film transistors, a second common electrode alternately disposed with the second pixel electrode, and ; First and second liquid crystal layers interposed between the color filter substrate and the barrier substrate and spaced apart spaces of the color filter substrate and the array substrate, respectively. Multi-view liquid crystal display comprising a. The method of claim 1, In the triple view driving, a first control signal is applied to the first sub-pixel, a second control signal is applied to the second sub-pixel, and a third control signal is applied to the third sub-pixel. A first image displayed as a combination, a second image displayed as a combination of the second sub pixels in the left viewing angle direction, and a third image displayed as a combination of the third sub pixels in the right viewing angle direction are independently implemented. Multi-view liquid crystal display device. The method of claim 1, In the dual view driving, the first sub-pixel maintains an off state, a second control signal is applied to the second sub-pixel, and a third control signal is applied to the third sub-pixel. And a second image displayed as a combination of pixels and a third image displayed as a combination of the third sub-pixels in the right viewing angle direction. The method of claim 1, In one-view driving, a first control signal is applied to the first, second, and third sub-pixels to implement only a first image displayed by a combination of the first, second, and third sub-pixels. Multi View Liquid Crystal Display. The method of claim 1, The first liquid crystal layer interposed between the barrier substrate and the color filter substrate serves to block interference between the first, second, and third images represented by a combination of the first, second, and third sub-pixels. Multi-view liquid crystal display device. The method of claim 1, The liquid crystal interposed in the first liquid crystal layer may be controlled on / off by a horizontal electric field between the first pixel electrode and the first common electrode corresponding to the red, green, and blue sub color filters one-to-one. Display. The method of claim 1, When the plurality of first common electrodes are not formed on the lower surface of the barrier substrate, a first common electrode is formed on the upper surface of the color filter substrate to form the first liquid crystal through a vertical electric field with the first pixel electrode. A multi-view liquid crystal display device for driving a layer. The method of claim 1, When the plurality of second common electrodes are not formed on the array substrate, a second common electrode is formed on a lower surface of the color filter substrate to form the second liquid crystal layer through a vertical electric field with the second pixel electrode. Multi-view liquid crystal display, characterized in that for driving. The method of claim 1, And a plurality of black matrices corresponding to the boundary regions of the red, green, and blue sub color filters.

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