KR20090058992A - Multi view display device - Google Patents

Abstract

A multi view display device is provided to dispose a parallax transform unit in a rear side of a display panel and increase quantity of light applied to an LC panel by re-reflecting light, applied from a backlight, and light, reflected from the display panel, to the LC panel. A multiple view display device(100) comprises a display panel(101), a back light(130), and a parallax barrier layer(120). The display panel displays an image. The backlight supplies light to the display panel. The parallax barrier layer is installed between the display panel and the backlight, and controls a path of light supplied to the display panel. Therefore, the parallax barrier layer implements different images according to a viewing direction. Light applied from the backlight is reflected to the backlight, and light applied from the display panel is re-reflected to an LC panel.

Description

MULTI VIEW DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-view display, and more particularly, to a multi-view display having improved luminance by disposing a parallax converter between a backlight and a liquid crystal panel and reflecting light reflected from the parallax barrier layer back to the liquid crystal panel.

Recently, with increasing interest in information display devices and increasing demands for using portable information carriers, lightweight panel displays (FPDs), which replace the conventional display device, the Cathode Ray Tube (CRT) The research and commercialization of the project is focused on. In particular, flat panel display devices such as liquid crystal displays (LCDs) and plasma display panels (PDPs) have excellent resolution, color display, and image quality, and are actively applied to notebooks or desktop monitors. It is becoming.

In addition, such a flat panel display device has recently been provided as a portable image device for broadcasting a movie or the like according to the development of electronic devices. In addition, according to the development of a high-speed communication network, a portable video gig machine capable of watching TV programs in real time has been introduced. In particular, these imaging devices are combined with the Global Positioning System to display movies and TV programs as well as to be used as navigation, allowing users to enjoy video and to guide users to locations and roads. .

Such an image device is a personal display device, which not only has the advantage of watching a desired movie or image program as desired, but also when the vehicle is mounted, it displays a road while driving and guides the road to its destination, or a passenger takes a movie or TV program while driving. By watching, you can relieve boredom.

As described above, in the case of using one imaging apparatus, users with different needs are often required to view different information or images for the same display apparatus. For example, in the case of a video device mounted on a car, a driver may want to watch a navigation guide image, but a passenger may want to watch another movie. Also, as another example, each player in a two or more computer game wants to see the game from his or her own perspective.

These conflicting requirements can be met by providing two separate displays, but this would take up excessive space and add cost.

Recently, a multi-view display device has been proposed to solve this problem. The multi-view display device is configured to implement a different image when one display device is viewed from a different direction, and such a multi-view display device is disclosed in FIGS. 1 and 2.

As shown in FIG. 1, the multi-view display device can view each image in three different directions, which are conceptually described as follows. As shown in FIG. 2, the multi-view display device 10 is a technology for displaying two or three different images in one display panel by controlling a viewing angle. In addition, the viewing angle control type display device capable of displaying different images on the right side (C).

In the drawing, a three-view display device 10 capable of viewing different images when the panel is viewed from the front (A), at the left 50-degree tilt (B), and at the right 50-degree tilt (C). ) Is shown as an example.

Since the triple visual display device 10 simultaneously displays three types of images, the number of pixels in each direction is one third of the total number of pixels, and the dual visual display device simultaneously displays three types of images. The number of pixels in each direction is 1/2 of the total number of pixels.

As described above, the multi-view display device is a display device capable of simultaneously providing different images according to the viewing direction using a single display panel. As shown in FIG. 2, the multi-view display device is incident from a backlight using the parallax barrier 20. The divided light is divided into three optical paths of the center (C), left (L), and right (R) pixels to display three different images at the same time.

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

3 illustrates a structure of a conventional multi-view display device. As shown in FIG. 3, the conventional multi-view perspective device 10 includes a liquid crystal display panel 1 and a parallax converting unit 2 including a parallax barrier 20.

The liquid crystal display panel 1 is largely composed of a color filter substrate 5 and an array substrate 12, and a liquid crystal layer (not shown) formed between the color filter substrate 5 and the array substrate 12.

The color filter substrate 5 distinguishes between a color filter composed of a plurality of sub-color filters 7 for realizing red, green, and blue colors and the sub-color filter 7 and transmits light passing through the liquid crystal layer. Blocking black matrix 6, and a transparent common electrode (not shown) for applying a voltage to the liquid crystal layer.

The sub-color filter 7 is composed of a first sub-color filter 7C for the front view and a second sub-color filter 7L and a third sub-color filter 7R for the left and right views. consist of.

The color filter substrate 5 and the array substrate 12 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 1, wherein the parallax converting means Linear polarizing plates 9 and 19 are attached to the outermost surfaces of (2) and array substrate 1, respectively. The linear polarizers 9 and 19 selectively transmit only the light vibrating strongly in a specific direction among the light transmitted through the liquid crystal so that the image display function assigned to the liquid crystal display panel 1 can be satisfactorily performed. It serves as an assistant.

In this case, the liquid crystal display panel 1 is provided with a backlight for irradiating light to the liquid crystal display panel 1, wherein the backlight is provided with a light guide plate 40 and a light guide plate disposed on a rear surface of the liquid crystal display panel 1. A plurality of lamps 30 disposed on the side of the light emitting plate 40, a reflecting plate (not shown) disposed on the rear surface of the light guide plate 40, and an upper portion of the light guide plate 40 are scattered to emit uniform light. It consists of a plurality of optical sheets 45 and the like.

The parallax converting unit 2 is formed on the substrate 21 and the substrate 21 to be a parallax barrier layer 20.

The substrate 21 on which the parallax barrier layer 20 is formed is bonded to the color filter substrate 5 by a predetermined adhesive material 122. The parallax barrier layer 20 is mainly made of black resin or made of metal.

Light of the backlight toward the parallax barrier layer 20 is absorbed by the parallax barrier layer 20 or the parallax barrier 20 by the slit parallax barrier layer 20 as shown by the solid line in the drawing. As a result of the reflection, there is a problem in that a phenomenon in which the luminance decreases appears. For example, when the parallax barrier 20 is formed of black resin, the front luminance is reduced to about 1/6.

The present invention is to solve the above problems, the parallax conversion unit is disposed on the back of the display panel and the parallax barrier layer is reflected back to the liquid crystal panel and the light incident from the backlight and the light reflected from the display panel is supplied to the liquid crystal panel An object of the present invention is to provide a multi-view display device capable of improving luminance by increasing the amount of light.

In order to achieve the above object, the multi-view display device according to the present invention is a display panel for displaying an image, a backlight for supplying light to the display panel, and is provided between the display panel and the backlight is supplied to the display panel The parallax converting unit includes a parallax converting unit including a plurality of parallax barrier layers that adjust light paths to implement different images according to a viewing direction of a user, and reflect light incident from a backlight, but do not reflect light incident from a display panel.

The parallax converting part includes a substrate, a first parallax barrier layer formed on the substrate, a second parallax barrier layer formed of a retroreflective material, and formed on the first parallax barrier layer on the first parallax barrier layer. On the surface of the layer, glass beads or tetrahedral microprisms are formed.

In the present invention, by forming the parallax conversion layer of the parallax conversion unit with a metal having good reflectivity and a retroreflective material, the following effects can be obtained.

First, in the present invention, the parallax converter may be disposed between the display panel and the backlight to improve luminance by reflecting light reflected from the parallax barrier layer back to the display panel.

Second, in the present invention, the upper portion of the parallax barrier layer may be formed of a retroreflective material to further improve luminance by retroreflecting light reflected from the display panel to the display panel.

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

4 is a diagram illustrating a multi-view display device according to the present invention. At this time, in the drawings, a multi-view multi-display device for viewing each image in three different directions is illustrated, but the present invention is not limited to the triple-view display device, but may also be applied to a double-view display device. will be.

As shown in FIG. 4, the multi-etch display device 100 according to the present invention includes a liquid crystal display panel 101 on which an actual image is implemented, and a rear surface of the liquid crystal display panel 101. A plurality of paths of light supplied from the backlight 130 to the liquid crystal display panel 101 are formed between the backlight 130 for supplying light to the 101 and the liquid crystal display panel 101 and the backlight 130. It is composed of a parallax conversion unit 102.

As shown in FIG. 5, the liquid crystal display panel 101 includes a color filter substrate 105 and an array substrate 110, and a liquid crystal layer 129 formed between the color filter substrate 105 and the array substrate 110. It consists of. The array substrate 110 is arranged horizontally and horizontally to define a plurality of pixel regions and a plurality of gate lines 116 and data lines 117 and formed in each pixel region from the outside along the gate line 116. When the scan signal is applied, an image signal is input through the data line 117 when the thin film transistor T is formed in the pixel region P and the thin film transistor T is driven to realize an actual image. Consisting of pixel electrodes (P).

In addition, the color filter substrate 105 is formed between the color filter composed of a plurality of sub-color filters 107 for realizing red, green, and blue colors and the sub-color filter 107 to form a liquid crystal display panel 101. A black matrix 106 that blocks light from being transmitted to an image non-display area of the upper and lower pixels, and a liquid crystal together with the pixel electrode when a voltage is supplied to the pixel electrode formed on the color filter 105 and the black matrix 106. It consists of a common electrode (not shown) that applies an electric field to the layer 129.

As shown in FIG. 4, the sub-color filter 207 includes a first sub-color filter 107C for the front view and a second sub-color filter 107L and a third for the left and right fields. Sub-color filter 107R.

The array substrate 110 and the color filter substrate 105 configured as described above are bonded to each other by sealants (not shown) formed on the outer side of the image display area in a state facing each other to form the liquid crystal display panel 101. In this case, the linear polarizer 109 is attached to the outermost surface of the color filter substrate 105.

A parallax converting unit 102 is attached to the lower portion of the liquid crystal display panel 101. The parallax converting unit 102 separates an image output from the liquid crystal display panel 101 into a plurality of paths by separating light into a plurality of paths and supplying the light to the liquid crystal display panel 101. Display. In this case, a plurality of parallax barrier layers 150 are formed in the parallax converter 102 to separate light supplied to the liquid crystal display panel 101 into a plurality of paths.

As shown in FIG. 6, the parallax converter 102 includes a substrate 120 made of a transparent material such as glass, a first parallax barrier layer 152 formed on the substrate 120, and the first parallax. The second parallax barrier layer 154 formed on the barrier layer 152. At this time, the first parallax barrier layer 152 is made of Al alloy, such as Al, AlNd, or a metal having good reflectivity, such as Cr, and reflects light from the bottom, and the second parallax barrier layer 152 is a retroreflective material. It consists of a light incident from the top to reflect through the same path to the top.

The parallax converting unit 102 is divided into a transmission region and a blocking region by the first parallax barrier layer 152 and the second parallax barrier layer 154 to transmit a part of light and block a part of the liquid crystal display panel 101. Separates a plurality of paths of light to be supplied. In this case, the widths of the transmission area and the blocking area, that is, the widths of the first parallax barrier layer 152 and the second parallax barrier layer 154 and the gap therebetween, are used for the parallax converter 102 and the liquid crystal display panel 101. It will vary depending on the interval between, the viewing angle of viewing the multi-screen and the number of multiple views.

A backlight 130 is disposed on the rear surface of the parallax converter 102 to supply light to the liquid crystal display panel 101. The backlight 130 includes a plurality of lamps 131 disposed on a rear surface thereof to emit light, and light emitted from the lamps 131 disposed on a rear surface of the parallax converter 120 to the liquid crystal display panel 101. A light guide plate 140 to be guided and disposed between the parallax converter 120 and the light guide plate 140 to be scattered by the light guide plate 140 and supplied to the liquid crystal display panel 101 to scatter the light. A plurality of optical sheets 145 for supplying uniform light to the 101 and a reflecting plate provided below the light guide plate 140 to reflect the light directed to the bottom of the light guide plate 140 to the liquid crystal display panel 101. 135).

In the multi-view display device 100 configured as described above, when a scan signal is input from an external driving device through the gate line 116 of the liquid crystal display panel 101, the thin film transistor T formed in the pixel region is turned on. As the thin film transistor T is turned on, an image signal is applied from the outside to the pixel electrode P through the data line 117 to apply an electric field to the liquid crystal layer 129. As the electric field is applied to the liquid crystal layer 129, the liquid crystal molecules of the liquid crystal layer 129 are arranged along the electric field to adjust the light transmittance passing through the liquid crystal layer 129 to display an image.

In this case, the parallax barrier layer 150 of the parallax converter 120 separates a path of light supplied from the backlight 130 to the liquid crystal display panel 101 into a plurality of paths to supply light to the liquid crystal display panel 101. do. Therefore, the image displayed on the liquid crystal display panel 101 to which the separated light is supplied is also displayed through a plurality of paths. That is, by simultaneously displaying a plurality of images in a set area, a plurality of viewers can simultaneously view different images.

On the other hand, as shown in Figure 6, the first parallax barrier layer 152 of the parallax converter 120 is made of a metal with good reflectance. Therefore, the light incident on the first parallax barrier layer 152 among the light supplied from the backlight 130 to the liquid crystal display panel 101 is reflected by the first parallax barrier layer 152, and the reflected light is reflected. The light is again reflected by the reflective plate 135 of the backlight 130 and supplied to the liquid crystal display panel 101 through the transmissive region of the parallax converter 120. In this case, the light reflected from the first parallax barrier layer 152 is again supplied to the liquid crystal display panel 101 through the same process.

In a conventional multi-view display device, a parallax converting unit is disposed on a front surface of a liquid crystal display panel so that light emitted from the liquid crystal display panel is separated by a parallax converting unit so that an image path is divided into a plurality of paths. Therefore, since the light blocked by the parallax barrier layer of the parallax converter is not supplied to the liquid crystal display panel 101, the luminance is lowered.

However, in the present invention, the parallax converting unit 120 is disposed between the liquid crystal display panel 101 and the backlight 130, and the first parallax barrier layer 152 of the parallax converting unit 120 into which light is incident has a good reflectance. Since the light is made of metal, light blocked by the first parallax barrier layer 152 is reflected by the reflector 135 of the backlight 130 and supplied to the liquid crystal display panel 101. Thus, the parallax converting unit 120 may improve luminance compared to the conventional display device in which the parallax converter 120 is disposed in front of the liquid crystal display panel 101. This arrangement enables the multi-view display device of the present invention to expect about 30% more brightness than the conventional display device.

As shown in FIG. 6, the second parallax barrier layer 154 formed on the first parallax barrier layer 152 is made of a retroreflective material, and thus the second parallax barrier layer 154 is retroreflected. Formation of the material is for the following reasons.

Various metal patterns such as the gate line 116 and the data line 117 are formed in the liquid crystal display panel 101 to which light is supplied through the parallax converter 120. Therefore, the light transmitted through the transmissive region of the parallax converter 120 and supplied to the liquid crystal display panel 101 is reflected by the metal pattern and is incident to the parallax converter 120. At this time, if the parallax barrier layer of the parallax converter 120 is formed of only a metal layer having a good reflectance, the light incident on the parallax converter 120 is reflected back from the parallax barrier layer to the liquid crystal display panel 101. Incident.

However, since the light reflected from the parallax barrier layer and incident on the liquid crystal display panel 101 is not incident along the set path and does not enter the original pixel, it acts as noise in the liquid crystal display panel 101. As a result, crosstalk occurs in the liquid crystal display panel 101.

However, in the present invention, the uppermost layer of the parallax barrier layer and the second parallax barrier layer 154 are formed of a retroreflective material. The retroreflective material reflects incident light as it is through the incident path, which will be described with reference to FIGS. 7A and 7B.

7A and 7B are enlarged views of region A of FIG. 6, showing retroreflective materials.

As shown in FIG. 7A, fine glass beads 155 are formed on the surface of the second parallax barrier layer 154. In this case, since the glass beads 155 are formed over the entire surface of the second parallax barrier layer 154, the light incident on the second parallax barrier layer 154 is input to the glass beads 155. do. The light input to the glass beads 155 is refracted at the surface of the glass beads 155 and is vertically incident on the surface opposite to the glass beads 155 and then reflected at the opposite surface to be refracted to the opposite side of the glass beads 155. And output to the outside. The glass beads 155 are completely spheres and isotropic. Therefore, light incident on all surfaces of the glass beads 155 is refracted at the same angle to be incident on the opposite surface, and is also refracted at the surface at the same angle as the incident angle after being reflected at the same angle on the opposite surface. Eventually, the light exits parallel to the incident path.

In addition, as shown in FIG. 7B, a tetrahedral fine prism 156 may be formed on the surface of the second parallax barrier layer 154. In this case, since the microprism is formed over the entire second parallax barrier layer 154, the light incident on the second parallax barrier layer 154 is incident to the microprism 156. The light incident from the outside to the first surface of the microprism 156 is refracted at a predetermined angle and then incident to the second surface, and the light incident on the second surface is reflected from the second surface and incident to the third surface. do. Light incident on the third surface is refracted by the third surface and output to the outside. In this case, since the incident angle and the exit angle of the light incident on the second surface are the same, the refractive angle on the third surface is the same as the refractive angle on the first surface. Therefore, the light emitted from the third surface is parallel to the light incident on the first surface.

As described above, in the present invention, since the second parallax barrier layer 154 is formed of a retroreflective material, the light reflected from the liquid crystal panel 101 is retroreflected from the second parallax barrier layer 154, thereby forming a liquid crystal panel 101. Is incident again. At this time, since the light reflected by the liquid crystal panel 101 is reflected in parallel with the light reflected by the liquid crystal panel 101, the light is incident back to the original position, that is, the original pixel. Therefore, the defect by the incidence of unwanted light does not occur.

As a result, in the present invention, since the parallax barrier layer of the parallax converting part is formed of a metal having high reflectance and a retroreflective material, the light is smoothly supplied to the liquid crystal display panel 101 so that the luminance of the liquid crystal display panel 101 can be improved. In addition, it is possible to prevent crosstalk from occurring by preventing the light reflected from the liquid crystal display panel 101 from being reflected back to the liquid crystal display panel 101.

The parallax converting unit 102 having the above-described configuration is adhered to the rear surface of the liquid crystal display panel 101 by the adhesive layer 122, thereby manufacturing a multi-view display device.

In the detailed description, a liquid crystal display panel is described as an example of the display panel, but the present invention is not limited thereto. The present invention may also use various flat panel display devices such as plasma display devices or organic light emitting diodes (OLEDs). In addition, although a TN (Twisted Nematic) mode liquid crystal display panel in which a pixel electrode and a common electrode are formed on the upper and lower substrates as a liquid crystal display panel has been described, the present invention is not limited to the liquid crystal display panel of this particular mode, but is in an IPS The present invention may also be applied to a switching mode LCD panel or a VA (vertical alignment) mode LCD panel.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Accordingly, the scope of the invention should not be determined by the described embodiments, but should be determined by the appended claims.

1 is a schematic representation of a multi-view display device capable of viewing each image in three different directions.

2 is a diagram schematically illustrating a concept of a multi-view display device.

3 is a diagram illustrating a structure of a conventional multi-view display device.

4 is a diagram illustrating a structure of a multi-view display device according to the present invention.

5 is an exploded perspective view showing the structure of a liquid crystal display panel applied to a multi-view display device of the present invention.

6 is a diagram illustrating a structure of a parallax conversion unit of a multi-view display device according to the present invention.

An enlarged view of area A of FIG. 6 in FIGS. 7A and 7B.

Explanation of symbols on the main parts of the drawings

100: multi-view display device 101: liquid crystal display panel

102: parallax conversion unit 105: color filter substrate

107: sub-color filter 110,210: array substrate

120: parallax barrier layer 155: glass beads

156: microprism

Claims (9)

A display panel displaying an image; A backlight for supplying light to the display panel; And It is installed between the display panel and the backlight to adjust the path of the light supplied to the display panel to implement a different image according to the viewing direction of the user, the light incident from the backlight is reflected to the backlight and the light incident from the display panel is the liquid crystal panel And a parallax transforming unit including a plurality of parallax barrier layers for retroreflecting. The multi-view display device of claim 1, wherein the display panel comprises a liquid crystal display panel, a plasma display device, and an organic light emitting display device. The liquid crystal display panel of claim 2, wherein A color filter substrate on which a color filter comprising a plurality of sub-color filters for a plurality of fields of view is formed; An array substrate on which a thin film transistor is formed; And And a liquid crystal layer formed between the color filter substrate and the array substrate. The method of claim 1, wherein the parallax converter, Board; A first parallax barrier layer formed on the substrate and made of metal; And And a second parallax barrier layer formed of a retroreflective material and formed on the first parallax barrier layer. The multi-view display device of claim 4, wherein the first parallax barrier layer is made of a material selected from a group consisting of Al, Al alloy, and Cr. The display device of claim 4, wherein glass beads are formed on a surface of the second parallax barrier layer. The display device of claim 4, wherein a tetrahedral fine prism is formed on a surface of the second parallax barrier layer. The multi-view display device of claim 1, further comprising an adhesive layer for attaching the display panel and the parallax converter to each other. The multi-view display device of claim 1, wherein the backlight comprises a reflector to reflect light reflected from the parallax barrier layer to the display panel.

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