KR101375850B1 - Multi view display device - Google Patents

Abstract

The multi view display of the present invention is provided by a parallax barrier by providing a parallax barrier between a liquid crystal display panel and a backlight unit and forming a wire grid polarizer between the parallax barriers. In order to prevent a decrease in luminance, the display device comprises a color filter substrate having a color filter for realizing red, green, and blue colors, an array substrate having a thin film transistor, and a liquid crystal layer formed between the color filter substrate and the array substrate. A liquid crystal display panel; A linear polarizer attached to the outermost surface of the color filter substrate; A backlight unit disposed on a rear surface of the liquid crystal display panel to irradiate backlight light to the liquid crystal display panel; And between the liquid crystal display panel and the backlight unit to display different images according to the viewing direction (ie, front view, left view and right view) of the user, and between the parallax barrier patterned in one direction and the parallax barriers. And a parallax converting means composed of a wire lattice polarizer formed in the color filter, wherein the color filter includes a first sub-color filter, a second sub-color filter, and a third sub-color for the front view, the left view, and the right view. The filter comprises a plurality of sub-color filters, and the wire lattice polarizer is attached to the outermost surface of the array substrate to serve as a lower polarizer, and is made of the same metal material as the parallax barrier.

Multi View Display, Parallax Barrier, Wire Lattice Polarizer, Liquid Crystal Display Panel

Description

Multi view display {MULTI VIEW DISPLAY DEVICE}

The present invention relates to a multi-view display, and more particularly to a multi-view display for displaying two or more images so that each image can be viewed in a different direction.

Recently, with increasing interest in information display and increasing demand for using a portable information carrier, a lightweight flat panel display (FPD), which replaces a conventional display device, a cathode ray tube (CRT), is used. The research and commercialization of Korea is focused on. Particularly, among such flat panel display devices, a liquid crystal display (LCD) is an apparatus for displaying an image using the optical anisotropy of a liquid crystal, and is excellent in resolution, color display and picture quality and is actively applied to a notebook or a desktop monitor have.

The liquid crystal display comprises a color filter substrate, an array substrate, and a liquid crystal layer formed between the color filter substrate and the array substrate.

The active matrix (AM) method, which is a driving method mainly used in the liquid crystal display device, uses an amorphous silicon thin film transistor (a-Si TFT) as a switching device to drive the liquid crystal in the pixel portion. to be.

Hereinafter, the structure of a typical liquid crystal display device will be described in detail with reference to FIG.

1 is an exploded perspective view schematically showing a general liquid crystal display device.

As shown in the figure, the liquid crystal display comprises a color filter substrate 5, an array substrate 10, and a liquid crystal layer (not shown) formed between the color filter substrate 5 and the array substrate 10 30).

The color filter substrate 5 includes a color filter C composed of a plurality of sub-color filters 7 implementing colors of red (R), green (G) and blue (B) A black matrix 6 for separating the sub-color filters 7 from each other and shielding light transmitted through the liquid crystal layer 30 and a transparent common electrode for applying a voltage to the liquid crystal layer 30 8).

The array substrate 10 includes a plurality of gate lines 16 and data lines 17 arranged vertically and horizontally to define a plurality of pixel regions P and a plurality of gate lines 16 and data lines 17 A thin film transistor T which is a switching element formed in the intersection region and a pixel electrode 18 formed on the pixel region P. [

The color filter substrate 5 and the array substrate 10 constructed as described above are adhered to each other by a sealant (not shown) formed on the periphery of the image display area to constitute a liquid crystal display panel, (Not shown) formed on the color filter substrate 5 or the array substrate 10.

The liquid crystal display device or the plasma display panel (PDP) has been designed to be viewed simultaneously by multiple users as a two-dimensional display device. The display characteristics of such a display device are made such that a viewer can view the same high quality image from different angles with respect to the display device.

However, there are many cases where it is required for each user to see different information from the same display device. For example, in a car the driver may want to see satellite navigation data while the passenger may want to watch a movie. As another example, each player in a two or more computer game wants to see the game from his own perspective.

These conflicting requirements can be met by providing two separate displays, but this will take up excessive space and increase costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a multi-view display that displays two or more images so that each image can be viewed in a different direction.

Another object of the present invention is to provide a multi-view display in which image quality deterioration and luminance deterioration occur due to undesired reflection due to the use of parallax barriers.

Another object of the present invention is to provide a multi-view display that can have a parallax in the vertical direction.

Other objects and features of the present invention will be described in the following description of the invention and claims.

In order to achieve the above object, the multi-view display of the present invention is a color filter substrate formed with a color filter for implementing the colors of red, green and blue, an array substrate formed with a thin film transistor and a liquid crystal formed between the color filter substrate and the array substrate A liquid crystal display panel composed of layers to display an image; A linear polarizer attached to the outermost surface of the color filter substrate; A backlight unit disposed on a rear surface of the liquid crystal display panel to irradiate backlight light to the liquid crystal display panel; And between the liquid crystal display panel and the backlight unit to display different images according to the viewing direction (ie, front view, left view and right view) of the user, and between the parallax barrier patterned in one direction and the parallax barriers. And a parallax converting means composed of a wire lattice polarizer formed in the color filter, wherein the color filter includes a first sub-color filter, a second sub-color filter, and a third sub-color for the front view, the left view, and the right view. The filter comprises a plurality of sub-color filters, and the wire lattice polarizer is attached to the outermost surface of the array substrate to serve as a lower polarizer, and is made of the same metal material as the parallax barrier.

As described above, the multi-view display according to the present invention provides an effect of increasing the brightness of the multi-view display to implement the multi-view by more than 30% by using a parallax barrier.

In addition, the multi-view display according to the present invention can have a parallax in the vertical direction to meet the various needs of the user, such as a user who wants to watch lying down.

Hereinafter, preferred embodiments of a multi-view display according to the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary diagram schematically showing a multi-view display in which each image can be viewed in three different directions.

3 is an exemplary diagram schematically illustrating the concept of a multi-view display.

As shown in FIG. 3, the multi-view display 10 is a technology for displaying two or three different images on one display panel in a way of controlling the viewing angle. (C) is a viewing angle controlled display capable of displaying different images.

The drawing shows a triple view display 10 for viewing different images when the panel is viewed from the front (A), when viewed from the left 50-degree tilt (B), and when viewed from the right 50-degree tilt (C). For example, it is shown.

Since the triple view display 10 simultaneously displays three types of images, the number of pixels in each direction is one third of the total number of pixels, and a dual view display capable of displaying different images in two different left and right directions. This can be achieved by improving the technology and parallax barrier technology.

As such, the multi-view display is a display capable of simultaneously providing different images according to a viewing direction using a single liquid crystal display panel. As shown in FIG. 3, the multi-view display is incident from a backlight using a parallax barrier 23. The light is divided into three optical paths of the center (C), left (L), and right (R) pixels to display three different images simultaneously.

Accordingly, it is possible to watch a TV in the center (C), and to play games and surf the Internet on the left (L) or right (R).

The basis of this technology is a 3D liquid crystal display technology, and the 3D liquid crystal display technology installs a slit partially blocking the light on the front of a general liquid crystal display panel so that the right eye and the left eye can show different images. This is a technology that makes one image appear three-dimensional. At this time, the slit to be installed corresponds to the parallax barrier.

Here, although the parallax barrier applied in the 3D liquid crystal display device is used to realize the dual view or triple view display, the position of the parallax barrier is closer to the liquid crystal display panel so that the left and right images can be separated. By widening it is implemented.

As described above, in the 3D liquid crystal display, the image is separated at an angle of about 6 ° with respect to the left and right eyes by using a parallax barrier, but in the multi-view display, the separation angle is widened by 40 ° or more, and the pixel arrangement is optimized. Multi-view can be realized.

As application fields of the multi-view display, a car navigation device capable of multi-screen display, an advertisement display, and the like can be considered. For example, in the case of a car navigation application, a navigation screen is provided to a driver to display road information to a destination, a passenger's companion is displayed to make a tourist information searchable, and a back seat enjoys a DVD movie image. Application is possible. In addition, in the advertisement display field, three different pieces of information may be displayed according to a moving direction of a pedestrian.

Such multi-view displays can show different images to more than one user, providing significant savings in space and cost compared to using more than one individual display.

4 is a schematic cross-sectional view of a multi-view display according to a first exemplary embodiment of the present invention.

As shown in the figure, the multi-view display 100 according to the first embodiment includes a liquid crystal display panel 101 and a parallax barrier 120 constituting an image display device. )

In this case, the liquid crystal display panel 101 is used as an image display device, but the present invention is not limited thereto.

The liquid crystal display panel 101 includes a color filter substrate 105 and an array substrate 110, and a liquid crystal layer (not shown) formed between the color filter substrate 105 and the array substrate 110.

The color filter substrate 105 distinguishes between a color filter composed of a plurality of sub-color filters 107 for implementing respective colors of red, green, and blue and the sub-color filter 107 and transmits the liquid crystal layer. It consists of a black matrix 106 that blocks light, and a transparent common electrode (not shown) that applies a voltage to the liquid crystal layer.

In this case, the sub-color filter 107 according to the first embodiment of the present invention includes a first sub-color filter 107C for a front view and a second sub-color filter 107L for a left view and a right view. ) And a third sub-color filter 107R. At this time, the one sub-color filter 107 including the first sub-color filter 107C, the second sub-color filter 107L, and the third sub-color filter 107R is red, green, and blue. One color may be implemented, and three such sub-color filters 107 may be combined to form one pixel.

In addition, although not shown in detail in the drawing, the array substrate 110 is a thin film which is a switching element formed in a plurality of gate lines and data lines arranged vertically and horizontally to define a plurality of pixel regions, and intersecting regions of the gate lines and data lines. And a pixel electrode formed over the pixel region.

The color filter substrate 105 and the array substrate 110 configured as described above are joined to face each other by a sealant (not shown) formed on the outer side of the image display area to form a liquid crystal display panel 101. Linear polarizers 109 and 119 are attached to the outermost surfaces of 102 and array substrate 110, respectively. The linear polarizers 109 and 119 selectively transmit only light that vibrates strongly in a specific direction among the light that has passed through the liquid crystal, so that the image display function granted to the liquid crystal display panel 101 can be satisfactorily performed. It helps to help

In this case, the liquid crystal display panel 101 is provided with a backlight unit for irradiating light to the liquid crystal display panel 101, wherein the backlight unit includes a light guide plate 140 disposed on a rear surface of the liquid crystal display panel 101, and Lamps 130 disposed on the side of the light guide plate 140, a reflector (not shown) disposed on the rear surface of the light guide plate 140, and positioned above the light guide plate 140 to scatter light to emit uniform light. It consists of a plurality of optical sheet 145 or the like.

In general, the lamp 130 applied to the backlight unit may include a cold cathode fluorescence lamp having a tube shape having a length corresponding to a long side distance or a short side distance of the liquid crystal display panel 101; CCFL) is applied, and the cold cathode fluorescent lamp generates white light by power supplied through wires (not shown) at both ends.

At this time, the parallax converting means 102 according to the first embodiment of the present invention includes a substrate 121, the substrate 121 is a parallax arranged in an array form on the surface near the color filter substrate 105 Has a barrier 120.

In addition, a predetermined adhesive material 122 is interposed between the parallax conversion means 102 including the parallax barriers 120 and the color filter substrate 105 to pass the parallax conversion means 102 to the color filter substrate. (105) serves to adhere to the surface.

The parallax barrier 120 may be made of a resin black matrix or may be made of a metal material. In this case, the parallax barrier 120 may face the parallax barrier 120 as shown by a solid line in the drawing by installing a parallax barrier 120 having a slit structure. As the backlight light is absorbed by the parallax barrier 120 or reflected by the parallax barrier 120, a phenomenon that luminance decreases may appear. For example, when the parallax barrier 120 is formed of the resin black matrix, the front luminance decreases to about 1/6.

When the parallax barrier is present in front of the liquid crystal display panel as in the multi-view display according to the first embodiment of the present invention, the light emitted from the backlight is absorbed by the parallax barrier or blocked by the parallax barrier, thereby reducing the luminance. Done.

FIG. 5 is a schematic cross-sectional view of a multi-view display according to a second exemplary embodiment of the present invention, except that the parallax converting means is attached to the rear surface of the liquid crystal display panel, that is, the outer surface of the array substrate. Consists of the same components as the multi-view display of the embodiment.

As shown in the figure, the multi-view display 200 according to the second embodiment includes a liquid crystal display panel 201 constituting an image display device and a parallax converting means 202 including a parallax barrier 220. .

The liquid crystal display panel 201 includes a color filter substrate 205 and an array substrate 210, and a liquid crystal layer (not shown) formed between the color filter substrate 205 and the array substrate 210.

As described above, the color filter substrate 205 distinguishes between the color filter composed of a plurality of sub-color filters 207 and the sub-color filters 207 that implement respective colors of red, green, and blue, and the liquid crystal. The black matrix 206 blocks light passing through the layer, and a transparent common electrode (not shown) that applies a voltage to the liquid crystal layer.

In addition, the sub-color filter 207 according to the second embodiment of the present invention includes a first sub-color filter 207C for a front view and a second sub-color filter 207L for a left view and a right view. ) And a third sub-color filter 207R. In this case, one sub-color filter 207 including the first sub-color filter 207C, the second sub-color filter 207L, and the third sub-color filter 207R may be red, green, or blue. One color may be implemented, and the three sub-color filters 207 may form one pixel.

In addition, although not shown in detail in the drawing, the array substrate 210 is a thin film which is a switching element formed in a plurality of gate lines and data lines arranged vertically and horizontally to define a plurality of pixel regions, and intersecting regions of the gate lines and data lines. And a pixel electrode formed over the pixel region.

The color filter substrate 205 and the array substrate 210 configured as described above are joined to face each other by a sealant (not shown) formed at the outside of the image display area to form a liquid crystal display panel 201, wherein the color filter substrate A parallax converting means 202 including a parallax barrier 220 according to the second embodiment is attached to the outermost surface of 205, while a linear polarizer 209 is attached to the outermost surface of the array substrate 210. Is attached.

In this case, the liquid crystal display panel 201 is provided with a backlight unit for irradiating light to the liquid crystal display panel 201, wherein the backlight unit is a light guide plate 240 disposed on the rear surface of the parallax converting means 202, Lamps 230 disposed on the side of the light guide plate 240, a reflecting plate (not shown) disposed on the rear surface of the light guide plate 240, and positioned above the light guide plate 240 to scatter light to emit uniform light. It consists of a plurality of optical sheet 245 or the like.

At this time, the parallax converting means 202 according to the second embodiment of the present invention includes a substrate 221, the substrate 221 is a wire grid polarizer (wire grid) on the outermost surface of the array substrate 210 has a parallax barrier 220 interposed therebetween.

As described above, the parallax barrier 220 according to the second embodiment of the present invention may be made of a metal material such as chromium, and the wire lattice polarizer 225 serves as a lower polarizer in the space between the parallax barriers 220. Is formed to improve luminance efficiency due to reflection of light and to increase polarization degree.

That is, as shown in FIG. 6, by installing the parallax barrier 220 between the liquid crystal display panel 201 and the backlight unit, specifically, between the array substrate 210 and the backlight unit, as shown by the solid arrows in the drawing. As the backlight light directed toward the parallax barrier 220 is reflected back from the backlight unit and provided to the liquid crystal display panel, it is possible to prevent a decrease in luminance due to the formation of the parallax barrier 220. As a result, brightness improvement of about 30% or more is expected.

In this case, the wire lattice polarizing plate 225 may be simultaneously formed with the parallax barrier 220 using a metal material instead of the stretching type polarizing plate.

7A to 7D are plan views illustrating parallax conversion means according to the present invention, for example.

As shown in FIG. 7A, when the absorption axis of the polarizing plate is 90 °, the parallax converting means 302 according to the present invention is perpendicular to the parallax barriers 320, that is, with respect to the parallax barrier 320. The wire lattice polarizer 325 is formed in substantially parallel directions.

In addition, as shown in FIG. 7B, when the absorption axis of the polarizing plate is 0 °, the parallax converting means 402 according to the present invention has a horizontal direction between the parallax barriers 420, that is, the parallax barrier 420 It has a wire lattice polarizing plate 425 formed in a direction substantially intersecting with the.

At this time, the absorption axis of the polarizing plate may have any value between 0 and 180 °, in this case, as shown in FIG. 7C, the parallax converting means 502 according to the present invention is disposed between the parallax barriers 520. The wire grid polarizer 525 is formed at any angle between 0 and 180 degrees.

As described above, the parallax barriers 320 to 520 illustrated in FIGS. 7A to 7C are illustrated in the vertical direction, for example, but the present invention is not limited thereto. Can be patterned.

That is, FIG. 7D schematically illustrates the parallax converting means 602 when the parallax barrier 620 of the present invention is patterned in the horizontal direction, and the parallax converting means 602 according to the present invention is patterned in the horizontal direction. Between the parallax barriers 620, the wire lattice polarizer 625 may be formed at any angle between 0 ° and 180 ° depending on the absorption axis of the polarizer. In this case, there can be a parallax in the vertical direction, so that there is a need for a user who wants to watch lying down.

In this case, the pitch and line width of the wire grating constituting the wire grating polarizers 325 to 625 according to the present invention may be about 0.01 to 2 μm.

Although the present invention has been described using a liquid crystal display panel as an example of an image display device, the present invention is not limited thereto, and the present invention is not limited thereto, but the present invention may be applied to another display device manufactured by using a thin film transistor, for example, a driving transistor. It can also be used in organic light emitting display devices to which organic light emitting diodes (OLEDs) are connected.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

1 is an exploded perspective view schematically showing a general liquid crystal display device.

2 is an exemplary diagram schematically showing a multi-view display in which each image can be viewed in three different directions.

3 is an exemplary diagram schematically showing the concept of a multi-view display.

4 is a schematic cross-sectional view of a multi-view display according to a first embodiment of the present invention;

5 is a schematic cross-sectional view of a multi-view display according to a second embodiment of the present invention;

FIG. 6 is a diagram schematically illustrating an improvement in efficiency due to reflection of backlight light in the multi-view display of FIG. 5.

7A to 7D are plan views showing, for example, parallax conversion means according to the present invention;

DESCRIPTION OF REFERENCE NUMERALS

100,200: multi view display 101,201: liquid crystal display panel

102, 202 to 602: parallax conversion means 105, 205: color filter substrate

106,206: Black Matrix 107,207: Sub-Color Filter

110,210: array substrate 120,220 ~ 620: parallax barrier

121221: Substrate 225 ~ 625: Wire Lattice Polarizing Plate

Claims (9)

A liquid crystal display panel configured to display an image including a color filter substrate having a color filter for implementing red, green, and blue colors, an array substrate having a thin film transistor, and a liquid crystal layer formed between the color filter substrate and the array substrate; A linear polarizer attached to the outermost surface of the color filter substrate; A backlight unit disposed on a rear surface of the liquid crystal display panel to irradiate backlight light to the liquid crystal display panel; And Installed between the liquid crystal display panel and the backlight unit to display different images according to the viewing direction of the user (ie, front view, left view and right view), and between the parallax barrier patterned in one direction and the parallax barriers. Comprising a parallax conversion means composed of a wire grid polarizer formed, The color filter includes a plurality of sub-color filters including a first sub-color filter, a second sub-color filter, and a third sub-color filter for the front view, the left view, and the right view. The wire lattice polarizer is attached to the outermost surface of the array substrate to serve as a lower polarizer, while the multi-view display, characterized in that made of the same metal material as the parallax barrier. delete delete delete The multi view display of claim 1, wherein the parallax barrier is formed on a predetermined substrate. The multi view display of claim 1, wherein the parallax barrier and the wire lattice polarizer are made of chromium. The multi-view display of claim 1, wherein the wire lattice polarizer is formed at an angle between 0 and 180 degrees between the parallax barriers according to an absorption axis of the polarizer. The multi-view display of claim 1, wherein the wire lattice polarizer has a slit-shaped wire lattice. The multi-view display according to claim 8, wherein the pitch and line width of the wire grid have a value of 0.01 µm to 2 µm, respectively.

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