KR20170006039A - Multi view display device - Google Patents

Abstract

The present invention relates to a multi-view display device with a privacy protection function. The multi-view display device includes a display panel which displays an image, a first backlight unit which supplies a plurality of light with a line shape to the display panel in a privacy protection mode and a multi-view mode, and a second backlight unit which supplies light with a surface shape to the display panel in a normal driving mode.

Description

[0001] MULTI VIEW DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a multi-view display device, and more particularly, to a multi-view display device having a privacy protection function.

Recently, there is a growing demand for an information medium that is highly portable and portable. Accordingly, research and commercialization of a lightweight thin film flat panel display (FPD) replacing a conventional cathode ray tube (CRT) has been focused on.

The flat panel display includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode (OLED) ), Electrophoresis (EPD), and the like.

Products for personal privacy protection are being developed on such flat panel display devices. For example, devices such as ATMs of financial institutions, notebooks, and tablet PCs require narrow viewing angles in the left, right, and up and down directions in order to protect privacy. Conventionally known narrow viewing angle technologies include a method of attaching a viewing angle control film and a method of further providing a viewing angle control panel.

The method of attaching the viewing angle control film was developed by 3M Co., Ltd., and a method of attaching the privacy protecting substrate that forms the narrow viewing angle to the front surface of the display panel. The privacy protection substrate forms a louver layer between double skin layers made of polycarbonate and shields the light incident at a specific angle by adjusting the interval and height of the barrier ribs, .

A method of providing a viewing angle panel is a method of disposing a liquid crystal panel for viewing angle control on a front surface separately from a display panel on which an image is displayed. The viewing angle control liquid crystal panel changes the movement of the liquid crystal layer to realize a wide viewing angle and a narrow viewing angle.

However, the conventional narrow viewing angle technique described above has the following problems.

First, the method of attaching the viewing angle control film is expensive due to exclusive production of 3M company. In addition, there is a need to manually attach and detach the viewing angle control film to the display panel.

Second, a method of providing a viewing angle panel further includes a liquid crystal panel for viewing angle control separately from the display panel, which complicates the structure and increases power consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is a technical object of the present invention to provide a multi-view display device having a privacy protection function.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided a multi-view display apparatus including a display panel for displaying an image, a privacy protection mode, and a first backlight unit operating in a multi-view mode to supply a plurality of line- And a second backlight unit that operates in a normal driving mode to supply light of a planar shape to the display panel.

The first backlight unit may include a first light guide plate having a plurality of light emission patterns and a scattering pattern disposed between the plurality of light emission patterns, and a first light source provided on a side surface of the first light guide plate.

The second backlight unit may include a second light guide plate having a plurality of scattering patterns disposed thereunder, and a second light source disposed on a side surface of the second light guide plate.

Wherein the display panel is divided into a first group pixel and a second group pixel and a third group pixel arranged on both sides of the first group pixel, The light output pattern of the first light guide plate may overlap the first group pixel.

According to the solution of the above-mentioned problems, the present invention has the following effects.

The multi-view display device according to the present invention realizes a privacy mode, a multi-view mode, and a normal mode by selecting and driving a plurality of light guide plates having low cost and simple structure using a plurality of light sources. The present invention can improve the luminance efficiency by eliminating a separate optical member, for example, a barrier for view division. Further, in configuring the first to third group pixels for providing an image at a plurality of viewpoints, the number of sub-pixels may be varied or shading pixels may be arranged to reduce the crosstalk area, and the resolution of the privacy image may be increased in the privacy mode .

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention will be described below, or may be apparent to those skilled in the art from the description and the description.

1 is a configuration diagram of a multi-view display device according to an embodiment of the present invention.
2 is a cross-sectional view of a multi-view display device according to an embodiment of the present invention.
3 is for explaining the operation of the first backlight unit in the privacy mode and the multi-view mode.
4 shows a planar structure of the first backlight unit.
5 is for explaining the operation of the second backlight unit in the normal driving mode.
FIG. 6 is a schematic view illustrating a case where the display panel shown in FIG. 2 operates in a privacy protection mode.
FIG. 7 is a view schematically showing a case where the display panel shown in FIG. 2 operates in a multiple viewing mode.
FIG. 8 is a view schematically showing a case where the display panel shown in FIG. 2 operates in the normal driving mode.
9 is a cross-sectional view showing a configuration of first through third group pixels according to a comparative example.
10 is a cross-sectional view illustrating the configuration of first through third group pixels according to an embodiment of the present invention.
11 is a cross-sectional view illustrating the configuration of first through third group pixels according to another embodiment of the present invention.

The meaning of the terms described herein should be understood as follows. The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms. It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one. The term "on" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, preferred embodiments of the multi-view display according to the present invention will be described in detail with reference to the accompanying drawings. For reference, the multi-view display device of the present invention is implemented based on a liquid crystal display (LCD).

1 is a configuration diagram of a multi-view display device according to an embodiment of the present invention.

Referring to FIG. 1, a multi-view display apparatus according to an embodiment of the present invention includes a display panel 100 for displaying an image, a panel driver 200 for driving the display panel 100, a display panel 100 And a light source driving unit 400 for driving the backlight units 300 and 310. The backlight unit 300 includes a light source driving unit 400,

The display panel 100 of the present invention is driven by the panel driver 200 in any one of a privacy mode, a multi-view mode, and a normal mode.

In the privacy protection mode, only the user viewing the display panel 100 from the front can view the privacy image, and the user viewing the display panel 100 from the left or right side views the black image or the noise image.

In the multi-view mode, the user sees a different image according to the position (angle) of the display panel 100. That is, in the multi-view mode, the user viewing the display panel 100 from the front sees the first image, the user viewing the display panel 100 from the left sees the second image, The user viewing from the right side will see the third image.

The normal driving mode corresponds to the wide viewing angle mode as a general condition for displaying an image.

In particular, the embodiment of the present invention implements the privacy mode or the multi-view mode by driving the first backlight unit 300 that supplies the display panel 100 with a plurality of line-shaped lights. The embodiment of the present invention implements the normal driving mode by driving a second backlight unit 310 that supplies light of a planar form to the display panel 100. [

The display panel 100 includes a plurality of sub-pixels whose regions are divided by a gate line GL and a data line DL intersecting with each other.

The plurality of sub-pixels constituting the display panel 100 are arranged in a matrix of rows and columns, and each sub-pixel has one selected from red, green, and blue colors. A subpixel according to another embodiment of the present invention may have one selected from red, green, blue, and white colors.

In this display panel 100, successively arranged sub-pixels constitute one group of pixels. The group pixel is divided into a first group pixel G1 and second and third group pixels G2 and G3 arranged on both sides of the first group pixel G1. The first to third group pixels G1 to G3 are sequentially arranged and repeatedly arranged.

The first group pixel G1 is composed of at least one first sub-pixel SP1. The first group pixel G1 provides a privacy image of one frame to the user viewing the display panel 100 from the front in the privacy protection mode, And provides a first image constituting one frame to a viewer.

And the second group pixel G2 is disposed on one side of the first group pixel G1. The second group pixel G2 is composed of at least one second sub-pixel SP2. The second group pixel G2 provides a black image to the user viewing the display panel 100 from the left in the privacy protection mode and provides a black frame image to the user viewing the display panel 100 from the left in the multi- And a second image constituting the second image.

And the third group pixel G3 is arranged on the other side of the first group pixel G1. The third group pixel G3 includes at least one third sub-pixel SP3. A black image is provided to the user viewing the display panel 100 from the right side in the privacy protection mode, and a third image constituting one frame is provided to the user viewing the display panel 100 from the right side in the multi-view mode .

On the other hand, the first through third group pixels G1 through G3 provide the normal image to the user regardless of the position where the display panel 100 is viewed in the normal driving mode.

A sub-pixel is disposed at an intersection of the gate line GL and the data line DL. The sub-pixel has a thin film transistor (TFT) having a gate electrode, an active layer, a source electrode, and a drain electrode. The sub-pixel is filled with a liquid crystal material equivalent to a liquid crystal cell, and a storage capacitor for maintaining a constant voltage charged in the liquid crystal cell is formed.

The display panel 100 displays an image in each sub-pixel according to a scan signal sequentially supplied to the gate line GL and an image signal supplied through the data line DL.

A thin film transistor (TFT) provided for each sub-pixel is turned on when a scan signal is supplied from the gate line GL to charge the liquid crystal cell with an image signal received through the data line DL. Then, the image signal charged in the liquid crystal cell of the sub pixel is held for one frame period by the storage capacitor.

The panel driver 200 selectively drives a privacy protection mode, a multi-view mode, and a normal driving mode by controlling a signal applied to each sub-pixel of the display panel 100.

The panel driver 200 includes a gate driver 210 for driving the gate line GL and the data line DL of the display panel 100, a data driver 220, a timing controller 230, A signal converter 240, a signal converter 250, and the like.

The gate driver 210 sequentially supplies a scan signal to the gate line GL in response to a gate control signal supplied from the timing controller 230.

The data driver 220 converts the pixel data (gray level) input from the timing controller 230 via the signal converting unit 250 into an image signal in response to a data control signal supplied from the timing controller 230. The data driver 220 supplies the converted image signal to the data line DL.

Here, the image signal is a gamma voltage selected corresponding to red, green, and blue pixel data input from the outside among the gamma voltages supplied from the gamma voltage generator 240.

The timing controller 230 outputs pixel data of red, green and blue input from the outside and outputs the pixel data to the gate driver 210 and the data driver 220 using the vertical and horizontal synchronizing signals Vsync and Hsync, And generates a gate control signal and a data control signal for controlling the driving timings, respectively.

The timing controller 230 generates a backlight control signal in synchronization with the driving timings of the gate driver 210 and the data driver 220. The backlight control signal is for controlling the timing at which the light source driver 400 drives the first and second backlight units 300 and 310.

The gamma voltage generator 240 generates gamma voltages required for the digital / analog conversion of the data driver 220 within the gray scale range and supplies the gamma voltages to the data driver 220.

The signal converter 250 recognizes one mode selected from among a privacy mode, a multi-view mode, and a normal mode, and outputs pixel data output from the data driver 220 to the first through third group pixels (G1 to G3). Accordingly, the image signal applied from the data driver 220 to the sub-pixels of the display panel 100 is selectively changed.

The backlight units 300 and 310 include an LED array as a light source to supply light to the display panel 100. The backlight units 300 and 310 are configured in an edge manner in which a light source is disposed on a side portion of the display panel 100. [

The backlight units 300 and 310 include first and second backlight units 300 and 310, respectively.

The first backlight unit 300 operates in a privacy mode and a multi-view mode to supply a plurality of line-shaped lights to the display panel 100. The first backlight unit 300 does not operate in the normal drive mode.

The second backlight unit 310 operates in a normal driving mode to supply light of a planar shape to the display panel 100. The second backlight unit 310 does not operate in the privacy mode and the multi-view mode.

The light source driver 400 drives the first and second backlight units 300 and 310 in response to a backlight control signal supplied from the timing controller 230. The light source driving unit 400 selectively drives the first and second backlight units 300 and 310 in synchronization with the mode selection of the panel driving unit 200.

2 is a cross-sectional view of a multi-view display device according to an embodiment of the present invention. 3 is for explaining the operation of the first backlight unit 300 in the privacy mode and the multi-view mode. 4 shows a planar structure of the first backlight unit 300. As shown in FIG. 5 is for explaining the operation of the second backlight unit 310 in the normal drive mode.

Hereinafter, the configuration of the multi-view display device of the present invention will be described in more detail with reference to Figs. 1 and 2. Fig.

The display panel 100 includes an upper substrate 101, a lower substrate 102, an upper polarizing member 103 disposed on the upper portion of the upper substrate 101, a lower polarizing member 104 And a liquid crystal layer filled between the upper and lower substrates 102.

The upper substrate 101 may include a color filter, a common electrode, a black matrix, or the like. The common electrode may be disposed on the lower substrate 102 according to a liquid crystal driving method of the display panel 100. [ The upper substrate 101 converts light incident through the liquid crystal layer into predetermined color light using a color filter, and emits the converted color light to the outside.

The lower substrate 102 is formed with signal wirings such as a plurality of gate lines GL and a plurality of data lines DL. A thin film transistor TFT is formed at the intersection of the gate line GL and the data line DL and the thin film transistor TFT is connected to the pixel electrode arranged in each sub pixel. The pixel electrode applies an electric field to the liquid crystal layer together with a common electrode to which a common voltage is supplied. The thin film transistor TFT supplies an image signal provided from the data line DL to the pixel electrode in response to a scan signal provided from the gate line GL. The liquid crystal layer adjusts the light transmittance according to the difference voltage between the data voltage according to the image signal applied to the pixel electrode and the common voltage applied to the common electrode.

A pad portion connected to each signal line may be provided on one side edge of the lower substrate 102, and a printed circuit board connected to the driving portion may be bonded to the pad portion. A gate driver 210 for supplying a scan signal to the gate line GL may be formed on one side of the lower substrate 102 or a non-display area on both sides of the lower side of the lower substrate 102. The gate driver 210 is formed in the same process as the thin film transistor (TFT) of each pixel to be connected to each gate line GL.

The upper polarizing member 103 may be composed of a polarizing film attached to the upper portion of the upper substrate 101 to polarize the color light transmitted through the upper substrate 101 and emitted to the outside.

The upper polarizing member 103 of the other embodiment is attached to the upper surface of the upper substrate 101 to polarize the color light transmitted through the upper substrate 101 and emitted to the outside, And a retarder film for separating the three-dimensional image displayed on the display panel 100, that is, the left eye image and the right eye image into different polarized states.

The lower polarizing member 104 may be a polarizing film attached to a lower portion of the lower substrate 102 to polarize light emitted from the backlight units 300 and 310 to the display panel 100.

The first backlight unit 300 includes a first light guide plate 302 and a first light source 304 provided on a side surface of the first light guide plate 302. The first light source 304 is composed of an LED array driven by the light source driver 400. The first light source 304 emits light to the side surface of the first light guide plate 302. The first light guide plate 302 guides the light provided from the first light source 304 and emits a plurality of linear light beams to the upper surface.

In particular, the first light guide plate 302 is provided with a plurality of light output patterns 306 at the bottom, and the plurality of light output patterns 306 are arranged to overlap with the first group pixels G1. The light incident on the side surface of the first light guide plate 302 is output by the light emission pattern 306 so as to face the periphery of the first group pixel G1 and the first group pixel G1.

Specifically, as shown in Fig. 3, the light reaching the light output pattern 306 is scattered by the light output pattern 306 and is emitted to the upper surface of the first light guide plate 302. As described above, the light scattered from the light output pattern 306 and emitted to the upper surface of the first light guide plate 302 has a specific angle range from the reference point where the light output pattern 306 is located, 1 to the third direction. The first direction is a direction passing vertically through the first group pixel G1 from the reference point. And the second direction is a direction passing through the second group pixel G2 diagonally from the reference point. And the third direction is a direction passing through the third group pixel G3 diagonally from the reference point.

The light path separation by the light output pattern 306 can be adjusted according to the pitch and the height of the light output pattern 306. [

Referring to FIG. 4, a plurality of light emission patterns 306 are arranged in a matrix form. The plurality of light emission patterns 306 are arranged in a second direction Y perpendicular to the first direction X from a first distance W1 in a first direction X in which light is incident from the first light source 304 The second interval W2 is narrow.

Accordingly, the plurality of light emission patterns 306 form a line in a direction perpendicular to the direction in which light is incident from the first light source 304. [ The first light guide plate 302 includes a first area A1 in which a plurality of light output patterns 306 are arranged linearly in the second direction Y and a second area A1 in which the light output pattern 306 is not disposed A2).

When the first light source 304 is turned on, the first light guide plate 302 is bright by scattering when the first region A1 is viewed from the upper surface, and when the second light source 304 is viewed from the upper surface It looks dark. This is because light reaching the second region A2 is totally reflected by providing the scattering pattern 308 in the second region A2. Therefore, the light emitted from the first light guide plate 302 has a plurality of line shapes corresponding to the plurality of first areas A1.

The plurality of light emission patterns 306 may be formed in an arbitrary pattern capable of diffusing and scattering light. The plurality of light emission patterns 306 may have various shapes such as a concave pattern, a protrusion pattern, or a dot pattern, for example. In addition, the plurality of light emission patterns 306 may be subjected to a haze process to enhance the scattering effect.

The second backlight unit 310 includes a second light guide plate 314 and a second light source 312 provided on a side surface of the second light guide plate 314. The second light source 312 is composed of an LED array driven by the light source driver 400. The second light source 312 irradiates light to the side surface of the second light guide plate 314. The second light guide plate 314 guides the light provided from the second light source 312 and emits scattered light to the upper surface. The second light guide plate 314 is provided under the first light guide plate 302. That is, the first light guide plate 302 is provided between the display panel 100 and the second light guide plate 314.

The second light guide plate 314 is provided with a plurality of scattering patterns 318 at the bottom. The plurality of scattering patterns 318 scatter light incident from the second light source 312 as shown in FIG. 5 to generate a uniform surface light source. The second light guide plate 314 has the same light profile as the light guide plate used in a general liquid crystal display device.

Although not shown, an optical sheet may be provided on the upper portion of the second light guide plate 314, and a reflective sheet may be further provided on the lower portion of the second light guide plate 314.

Hereinafter, the operation of the display panel 100 for each of the privacy mode, the multi-view mode, and the normal mode will be described.

FIG. 6 is a view schematically showing a case where the display panel 100 shown in FIG. 2 operates in a privacy protection mode.

Referring to FIG. 6, in the privacy mode, the panel driver 200 supplies a privacy image constituting one frame to the first group pixel G1, and simultaneously supplies the privacy image to the second and third group pixels G2 and G3, Signal. The panel driver 200 according to another embodiment of the present invention may supply a noise image signal to the second and third group pixels G2 and G3 instead of the black image signal in the privacy mode.

Accordingly, the plurality of first sub-pixels SP1 corresponding to the first group of pixels G1 display the privacy image constituting one frame, and the second and third sub-pixels corresponding to the second and third groups G1, SP2) display a black image.

In the privacy mode, the light source driving unit 400 drives the first backlight unit 300 in synchronization with the operation of the panel driving unit 200, and does not drive the second backlight unit 310. Accordingly, the first backlight unit 300 supplies the display panel 100 with a plurality of line-shaped lights aligned to overlap with the first group of pixels G1.

Then, the line-shaped light emitted from the first backlight unit 300 is supplied to the first through third group pixels G1 through G3 at different angles. Specifically, the first group pixel G1 is supplied with light in a first direction vertically penetrating the display panel 100, and the second group pixel G2 is provided with the display panel 100 through the left diagonal direction Light in the second direction is supplied to the third group pixel G3, and light in the third direction passing through the display panel 100 in the right diagonal direction is supplied to the third group pixel G3.

Accordingly, the privacy image displayed in the first group pixel G1 is provided at a first view point V1, which is viewed from the front of the display panel 100, and the black image displayed in the second group pixel G2, The black image displayed on the third group pixel G3 is provided to the third viewpoint V3 which is viewed from the right side of the display panel 100 .

As a result, a viewer viewing the display panel 100 in the privacy protection mode can view the privacy image only when viewing the display panel 100 from the front. When the display panel 100 is viewed from the left or right direction, the user views the black image.

FIG. 7 is a view schematically showing a case where the display panel 100 shown in FIG. 2 operates in a multi-view mode.

Referring to FIG. 7, in the multi-view mode, the panel driver 200 forms one frame for each of the first through third group pixels G1 through G3, and supplies the first through third video signals different from each other.

Therefore, the first to third sub-pixels SP3 corresponding to the first to third group pixels G1 to G3 display different first to third images.

Also, in the multi-view mode, the light source driver 400 drives the first backlight unit 300 in synchronization with the operation of the panel driver 200, and does not drive the second backlight unit 310. Accordingly, the first backlight unit 300 supplies the display panel 100 with a plurality of line-shaped lights aligned to overlap with the first group of pixels G1.

Then, the line-shaped light emitted from the first backlight unit 300 is supplied to the first through third group pixels G1 through G3 at different angles. Specifically, the first group pixel G1 is supplied with light in a first direction vertically penetrating the display panel 100, and the second group pixel G2 is provided with the display panel 100 through the left diagonal direction Light in the second direction is supplied to the third group pixel G3, and light in the third direction passing through the display panel 100 in the right diagonal direction is supplied to the third group pixel G3.

Accordingly, the first image displayed in the first group pixel G1 is provided at a first view point V1, which is viewed from the front of the display panel 100, and the second image displayed in the second group pixel G2, The third image displayed on the third group pixel G3 is provided to the third viewpoint V3 that is viewed from the right side of the display panel 100, .

As a result, viewers watching the display panel 100 in the multi-view mode will see different images according to the viewing angle of the display panel 100.

FIG. 8 is a view schematically showing a case where the display panel 100 shown in FIG. 2 operates in a normal driving mode.

Referring to FIG. 8, in the normal driving mode, the panel driver 200 supplies a normal image signal constituting one frame to the first to third group pixels G1 to G3.

Accordingly, the first to third sub-pixels SP3 corresponding to the first to third group pixels G1 to G3 respectively display a normal image constituting one frame.

In the normal driving mode, the light source driving unit 400 drives the second backlight unit 310 in synchronization with the operation of the panel driving unit 200, and does not drive the first backlight unit 300. Accordingly, the second backlight unit 310 supplies the display panel 100 with a planar light source whose luminance is uniformly distributed by the scattering pattern provided on the second light guide plate 314. [

Therefore, the viewer who watches the display panel 100 in the normal driving mode will see the normal image regardless of the position (angle) at which the display panel 100 is viewed.

Meanwhile, the inventors of the present invention have experimented with an optimal viewing distance and an optimal viewing zone. As a result, when the multi-visual display device of the present invention is driven in the privacy mode, the crosstalk area C / T) of the display panel 100 is widely present, thereby recognizing the problem that the user viewing the display panel 100 from the left and right sides can view the privacy image. In addition, the inventors have recognized the problem that the picture quality is lowered due to the low resolution of the privacy image in the privacy mode.

Accordingly, the inventors of the present invention have proposed a method for reducing the crosstalk area (C / T) in the privacy protection mode and improving the image quality by increasing the resolution as follows.

For reference, the crosstalk area C / T will first be described.

9 is a cross-sectional view showing the configuration of the first through third group pixels G1 through G3 according to the comparative example.

Referring to FIG. 9, the display panel 100 according to the comparative example has the same number of sub-pixels as each of the first through third group pixels G1 through G3. In FIG. 9, the number of sub-pixels constituting each of the first to third group pixels G1 to G3 is four.

The time when the display panel 100 is viewed from the front is referred to as a first point of view V1 and the point of time when the display panel 100 is viewed from the left and right is referred to as a second point and a third point of view V2, V3). Accordingly, a privacy image displayed from the first group pixel G1 is provided at the first time point V1 in the privacy mode, a black image displayed from the second group pixel G2 is provided at the second time point V2 And the black image displayed from the third group pixel G3 is provided at the third time point V3.

There is a crosstalk area (C / T) between the first view point (V1) at which the privacy image is provided in the privacy protection mode and the second view point (V2) at which the black image is provided. Similarly, there is a crosstalk region (C / T) between the first time point V1 and the third time point V3. However, when the crosstalk area (C / T) is widened in the privacy mode, privacy protection functions are degraded because the area where the privacy image is viewed becomes wider.

Therefore, a method of reducing the crosstalk area (C / T) is required, and the present invention proposes the following structure.

10 is a cross-sectional view showing the configuration of first to third group pixels G1 to G3 according to an embodiment of the present invention. 11 is a cross-sectional view showing the configuration of first to third group pixels G1 to G3 according to another embodiment of the present invention.

10, in the display panel 100 according to the embodiment of the present invention, the number of the first sub-pixels SP1 constituting the first group pixel G1 is greater than the number of the first sub-pixels SP1 constituting the second group pixel G2 2 sub-pixels SP2. The number of the second sub-pixels SP2 is the same as the number of the third sub-pixels SP3 constituting the third group pixel G3. That is, the number of the first sub-pixels SP1 is larger than the number of each of the second and third sub-pixels SP3.

Therefore, the present invention is characterized in that the number of the first sub-pixels SP1 constituting the first group pixel G1 relatively increases and the number of the second and third groups G2 and G3 constituting the second and third group pixels G2 and G3 relatively increases The number of sub-pixels SP3 is relatively reduced.

In the present invention, the directivity angle at which black images from the second and third group pixels G2 and G3 toward the second and third viewpoints V2 and V3 are emitted is reduced, and the cross talk region C / T is reduced. 9, when the number of sub-pixels constituting each of the first to third group pixels G1 to G3 is the same, the second and third group pixels G2 and G3 are divided into the second And the crosstalk region C / T overlapping the first view V1 are relatively wide because the directivity angle at which the black image directed to the third viewpoint V2, V3 is emitted is relatively large. However, in the embodiment of the present invention, instead of increasing the number of the first sub-pixels SP1 constituting the first group pixel G1 relatively, the second sub-pixel SP1 constituting the second and third group pixels G2 and G3 And the number of the third sub-pixels SP3 is relatively reduced, the crosstalk region C / T overlapping the first view V1 can be reduced. Therefore, the privacy protection function can be improved by displaying the privacy image only when the display panel 100 is viewed from the front.

Also, the number of the first sub-pixels SP1 constituting the first group pixel G1 for providing the privacy image in the privacy mode increases, and the resolution of the privacy image increases to improve the image quality.

Referring to FIG. 11, in the display panel 100 according to another embodiment of the present invention, at least one first shading pixel S1 is disposed between the first and second group pixels G1 and G2. And at least one second shading pixel S2 is disposed between the second and third group pixels G2 and G3.

That is, the outermost first sub-pixel SP1 and the second sub-pixel SP2 adjacent to the second group pixel G2 among the plurality of first sub-pixels SP1 and the first group pixel G2 among the plurality of second sub- At least one first light-shielding pixel S1 is provided between the adjacent second sub-pixels SP2. Among the plurality of first sub-pixels SP1, the outermost first sub-pixel SP1 adjacent to the third group pixel G3 and the first group pixel G1 among the plurality of third sub-pixels SP3 At least one second light-shielding pixel S2 is provided between the adjacent third sub-pixels SP3.

The first and second light-shielding pixels S1 and S2 are pixels that do not display an image, and serve as a shielding part. Another embodiment of the present invention is such that a light shielding gap is formed between the second and third group pixels G2 and G3 and the first group pixel G1 to form a light shielding gap from the second and third group pixels G2 and G3 2 and the third viewpoints V2, V3 is lowered, and the crosstalk area C / T is reduced.

The optimum viewing distance and the optimal viewing zone of the display panel 100 according to the present invention are determined by the distance from the light output pattern 306 to the display panel 100 and the distance between the light output pattern 306 And the number of sub-pixels constituting the first to third group pixels G1 to G3, the number of light-shielded pixels, and the like.

As described above, the multi-view display according to the present invention can realize a privacy protection mode, a multi-view mode, and a normal drive mode by selecting and operating a plurality of light guide plates, which are inexpensive and simple in structure, do. The present invention can improve the luminance efficiency by eliminating a separate optical member, for example, a barrier for view division. In configuring the first to third group pixels G1 to G3 for providing an image at a plurality of viewpoints, the number of sub-pixels may be varied or the shading pixels may be arranged to reduce the crosstalk area (C / T) In the privacy mode, the resolution of the privacy image can be increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of. Therefore, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

100: Display panel
200:
300: first backlight unit
310: second backlight unit
400: Light source driver

Claims (10)

A display panel for displaying an image;
A first backlight unit for supplying a plurality of line-shaped lights to the display panel in a privacy mode and a multi-view mode; And
And a second backlight unit for supplying light of a planar shape to the display panel in a normal drive mode. The method according to claim 1,
Wherein the first backlight unit includes a first light guide plate provided with a plurality of light emission patterns at a lower portion thereof and a first light source provided at a side face of the first light guide plate;
Wherein the second backlight unit includes a second light guide plate having a plurality of scattering patterns disposed thereunder and a second light source provided on a side surface of the second light guide plate. 3. The method of claim 2,
And the first light pipe is provided between the display panel and the second light pipe. 3. The method of claim 2,
Wherein the display panel is divided into a first group pixel and a second group pixel disposed on both sides of the first group pixel, the sub-pixels being consecutively arranged as one group pixel, Time display device. 5. The method of claim 4,
And the light output pattern of the first light pipe overlaps with the first group pixel. 5. The method of claim 4,
A panel driver for selectively driving the privacy mode, the multi-view mode, and the normal mode by controlling image signals applied to the first through third group pixels; And
And a light source driving unit selectively driving the first and second backlight units in synchronization with the mode selection of the panel driving unit. The method according to claim 6,
The panel driver
A privacy image of one frame is supplied to the first group pixel and a black video signal is supplied to the second group pixel and the third group pixel in the privacy protection mode,
The first to third image signals are supplied to the first to third group pixels in the multi-view mode,
And supplies a normal video signal constituting one frame to the first through third group pixels in the normal driving mode. 5. The method of claim 4,
Wherein the first group pixel has at least one first sub-pixel,
The second group pixel has at least one second sub-pixel,
And the third group pixel has at least one third sub-pixel. 9. The method of claim 8,
The number of the first sub-pixels is greater than the number of the second sub-pixels,
And the number of the second sub-pixels is equal to the number of the third sub-pixels. 9. The method of claim 8,
At least one first shading pixel is disposed between the first and second group pixels,
At least one second light blocking pixel is disposed between the second and third group pixels,
Wherein the number of the first and second light-shielded pixels is the same.

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