KR101779598B1 - Stereoscopic image display device - Google Patents

Abstract

According to an exemplary embodiment of the present invention, a stereoscopic image display device includes a display panel on which a 2D image or a 3D image is displayed, a data voltage of a 2D data format for the 2D image, A controller which controls the driving circuit in a driving mode of a 2D mode or a 3D mode and a controller which is disposed on a front surface of the display panel and which emits light from the display panel in a first mode Wherein the display panel includes R, G, B, and W subpixels, each of which is driven by a data line and a gate line, the subpixels being divided into a first polarized light and a second polarized light, Wherein the R, G, B, and W subpixels are applied with the data voltage of the 2D data format, and the R, G, and B subpixels in the 3D mode have the 3D data format While the W gradation voltage may be applied to the W sub-pixel.

Description

[0001] STEREOSCOPIC IMAGE DISPLAY DEVICE [0002]

The present invention relates to a stereoscopic image display device, and more particularly, to a stereoscopic image display device capable of improving an aperture ratio of a display panel and preventing crosstalk of a 3D image.

The stereoscopic display is divided into a stereoscopic technique and an autostereoscopic technique.

The binocular parallax method uses parallax images of left and right eyes with large stereoscopic effects, and is divided into a glasses system and a non-glasses system. The spectacle method realizes a stereoscopic image by using polarizing glasses or shutter glasses to display the right-and-left parallax images in a direct-view type display device or a projector by changing the polarization directions of the parallax images in a time-division manner. In the non-eyeglass system, stereoscopic images are realized by separating the optical axes of left and right parallax images using optical plates such as switchable barriers, parallax barrier, and lenticular lenses.

FIG. 1 is a view showing a conventional stereoscopic image display apparatus, and FIG. 2 is a view showing an opening area of a 2D image and a 3D image.

1, the above-described spectacle system may include a patterned retarder 5 for switching the polarization characteristics of light incident on the polarizing glasses 6 on the display panel 3 . The eyeglass system alternately displays the left eye image L and the right eye image R on the display panel 3 and switches the polarized light characteristics incident on the polarizing glasses 6 through the pattern retarder 5. [ Accordingly, a 3D image can be realized by dividing the left-eye image L and the right-eye image R spatially by the spectacle method. 1, reference numeral 1 denotes a backlight unit for irradiating light to the display panel 3, 2 and 4 denote polarizers attached to upper and lower surfaces of the display panel 3 for selecting linearly polarized light, Respectively.

In such a glasses system, the visibility of the 3D image is deteriorated due to the crosstalk generated at the upper / lower viewing angle position. As a result, the upper / lower viewing angles in which a 3D image of good image quality can be seen in the glasses system are very narrow. The crosstalk is such that the left eye image L passes through the left eye pattern reliator area as well as the right eye pattern reliever area at the upper / lower viewing angle position and the right eye image R passes through the left eye pattern RR, This is caused by the passage of the reliator area.

Accordingly, a method of forming a black matrix (BM) of a display panel over a certain width to serve as a black stripe (BS) has been proposed. 2 (a) and 2 (b), when the 3D image is implemented, the increase in the width of the black matrix, compared with the aperture ratio of the subpixel for implementing the conventional 2D image, .

The present invention provides a stereoscopic image display device capable of improving an aperture ratio of a display panel and preventing crosstalk of a 3D image.

According to an aspect of the present invention, there is provided a stereoscopic image display apparatus including a display panel on which a 2D image or a 3D image is displayed, A driving circuit for applying a voltage or a data voltage of a 3D data format for the 3D image, a controller for controlling the driving circuit in a driving mode of a 2D mode or a 3D mode, and a controller disposed in front of the display panel, And a patterned retarder for dividing the light from the display panel into the first polarized light and the second polarized light, wherein the display panel includes R, G, B, and W sub-pixels Wherein the data voltages of the 2D data format are applied to the R, G, B, and W subpixels in the 2D mode, and the data voltages of the R, G, On the other hand, the pixel voltage applied to the data of the 3D data format, the W sub-pixel may be applied to the black gray level voltage.

The R subpixel charges a first data voltage supplied from a first data line in response to a gate pulse from a gate line and the G subpixel is supplied from a second data line in response to a gate pulse from a gate line The B sub-pixel charges a third data voltage supplied from a third data line in response to a gate pulse from the gate line, and the W sub-pixel charges a second data voltage to a gate pulse from the gate line The fourth data voltage supplied from the fourth data line can be charged and driven.

In the 2D mode, the first data voltage is an R data voltage in a 2D data format, the second data voltage is a G data voltage in a 2D data format, the third data voltage is a B data voltage in a 2D data format, The fourth data voltage may be a W data voltage in a 2D data format.

In the 3D mode, the first, second, and third data voltages may be R, G, and B data voltages of the 3D data format, respectively, and the fourth data voltage may be the black gradation voltage.

The ratio of the vertical pitch of the W subpixel in the total vertical pixels of the subpixels may be determined in consideration of the viewing angle of the 3D image and the luminance of the 3D image.

The first polarized light and the second polarized light may exhibit polarization characteristics perpendicular to each other.

The stereoscopic image display device according to an embodiment of the present invention includes R, G, B, and W subpixels to enhance the aperture ratio of subpixels by transmitting W in W subpixels in 2D image implementation, There is an advantage that visibility can be improved by displaying black in the W subpixel and acting as a black stripe.

1 is a view showing a conventional three-dimensional image display apparatus.
2 is a view showing an aperture area of a 2D image and a 3D image.
3 is a block diagram illustrating a stereoscopic image display apparatus according to an exemplary embodiment of the present invention.
4 is a plan view showing a stereoscopic image display apparatus according to an embodiment of the present invention.
5A and 5B are diagrams illustrating display states of subpixels in the 3D image and 2D image implementation;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram illustrating a stereoscopic image display apparatus according to an embodiment of the present invention. FIG. 4 is a plan view illustrating a stereoscopic image display apparatus according to an exemplary embodiment of the present invention. FIG. 6 is a diagram showing a display state of sub pixels in 2D image implementation. FIG.

3, a stereoscopic image display apparatus according to an exemplary embodiment of the present invention includes a display device 11, a controller 12, a driving circuit 14, a pattern drift eraser 18, and polarizing glasses 20 .

The display element 11 is a display element for displaying a 2D image and a 3D image data and may be a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (Plasma Display Panel) PDP), and flat panel display devices such as electroluminescence devices (EL) and electrophoresis (EPD) devices including an inorganic electroluminescent device and an organic light emitting diode (OLED) . Hereinafter, the display panel 10 will be described with reference to a display panel of a liquid crystal display element.

The stereoscopic image display apparatus includes a backlight unit 17 disposed under the display panel 10 and a backlight unit 17 disposed between the display panel 10 and the patterned retarder 18 in the case where the display panel 10 is implemented by a liquid crystal display device. An upper polarizer film 16a disposed between the display panel 10 and the backlight unit 17 and a lower polarizer film 16b disposed between the display panel 10 and the backlight unit 17. [

The patterned retarder 18 is attached to the upper polarizing film 16a of the display panel 10. [ A first retarder is formed on the odd display lines of the pattern reliator 18 and a second retarder is formed on the even display lines of the pattern driver 18. The light absorption axis of the first retarder and the light absorption axis of the second retarder are different from each other. The first retarder of the patterned retarder 18 opposes the odd display lines of the pixel array and transmits light of the first polarized light (circularly polarized light or linearly polarized light) of light incident from the odd display lines of the pixel array. The second retarder of the retarder 18 transmits light of a second polarized light (circularly polarized light or linearly polarized light) of light incident from the even display line of the pixel array in opposition to the even display line of the pixel array. The first retarder of the pattern retarder 18 may be implemented as a polarizing filter transmitting the left circularly polarized light and the second retarder of the pattern retarder 18 may be implemented as a polarizing filter transmitting the right circularly polarized light.

The left eye polarizing filter (or the first polarizing filter) of the polarizing glasses 20 has the same optical absorption axis as the first retarder of the patterned retarder 18. The right eye polarizing filter (or the second polarizing filter) of the polarizing glasses 20 has the same optical absorption axis as the second retarder of the patterned retarder 18. For example, the left eye polarizing filter of the polarizing glasses 20 can be selected as a left circularly polarizing filter, and the right eye polarizing filter of the polarizing glasses 20 can be selected as a right circularly polarizing filter. The user can view the 3D image displayed on the stereoscopic image display device through the polarizing glasses 20. [

The display panel 10 has two glass substrates and a liquid crystal layer sandwiched therebetween. A TFT array (Thin Film Transistor Array) is formed on the lower glass substrate. The TFT array includes a plurality of data lines supplied with R, G, B, and W data voltages, a plurality of gate lines (or scan lines) supplied with gate pulses (or scan pulses) A plurality of TFTs (Thin Film Transistors) formed at intersections of lines and gate lines, a plurality of pixel electrodes for charging a data voltage to liquid crystal cells, and a plurality of pixel electrodes A capacitor (Storage Capacitor), and the like.

A color filter array is formed on the upper glass substrate. The color filter array includes a black matrix, a color filter, and the like. The common electrode forming the electric field opposite to the pixel electrode is formed on the upper glass substrate in the vertical electric field driving method such as TN (Twisted Nematic) mode and VA (Vertical Alignment) mode, and is used in IPS (In Plane Switching) mode and FFS Field switching mode in which a pixel electrode is formed on a lower glass substrate. An upper polarizing film 16a is attached to the upper glass substrate, a lower polarizing film 16b is attached to the lower glass substrate, and an alignment film for forming a pretilt angle of the liquid crystal is formed on the inner surface in contact with the liquid crystal. A column spacer for maintaining a cell gap of the liquid crystal cell may be formed between the glass substrates.

The driving circuit 14 includes a data driving circuit for supplying RGB data voltages and black gradation voltages to the data lines of the display panel 10 and a data driving circuit for sequentially supplying gate pulses to the gate lines of the display panel 10 And a gate driving circuit. The data driving circuit converts the RGB digital video data of the 3D data format input from the controller 12 in the 3D mode (Mode_3D) into an analog gamma voltage to generate RGB data voltages, Converts the data into an analog gamma voltage of peak black gradation to generate black gradation voltages.

The data driving circuit alternately supplies the RGB data voltages and the black gradation voltages to the data lines of the display panel 10 in a period of one horizontal period under the control of the controller 12. [ On the other hand, the data driving circuit converts the RGBW digital video data of the 2D data format input from the controller 12 in the 2D mode (Mode_2D) into an analog gamma voltage to generate RGBW data voltages, And supplies the data voltages to the data lines of the display panel 10.

The controller 12 responds to the 2D / 3D mode selection signal of the user input through the user interface or the 2D / 3D identification code extracted from the input video signal, and outputs the 2D / 3D identification code to the driving circuit (Mode_2D) or the 3D mode (Mode_3D) 14). In the 3D mode (Mode_3D), the controller 12 converts the RGB digital video data input from the outside into the 3D data format and the digital black (for example, The RGB digital video data and the digital black data are rearranged and supplied to the data driving circuit in such a manner that the data is mixed with one horizontal line each.

On the other hand, in the 2D mode (Mode_2D), the controller 12 copies RGBW digital video data input from the outside in a 2D data format in units of one horizontal line by using a memory or the like, and then outputs the input RGBW digital video data and the copied RGBW The RGBW digital video data is arranged in a redundant manner and supplied to the data driving circuit in such a manner that digital video data is mixed with one horizontal line each.

The controller 12 generates timing control signals for controlling the operation timing of the driving circuit 14 using timing signals such as a vertical synchronization signal, a horizontal synchronization signal, a dot clock, and a data enable. The controller 12 can drive the driving circuit 14 at a frame frequency of N.times.60 Hz, for example, 120 Hz, by multiplying the timing control signals by an integer multiple. In this case, the controller 12 is in the 3D mode (Mode_3D), R, G and B sub-pixels (SP _R, SP _G, SP _B) RGB data voltage is applied to the frame frequency of 120Hz W sub-pixel (SP in _W ) with the frame gray scale voltage of 120 Hz. In addition, the controller 12 is in the 2D mode (Mode_2D), R, G and B sub-pixels (SP _R, SP _G, SP _B) to a RGB data voltage is applied to the frame frequency of 120Hz W sub-pixel (SP _W ) Can be controlled so that the W data voltage is applied at a frame frequency of 120 Hz.

The backlight unit 17 includes at least one light source, and a plurality of optical members for converting light from the light source into a surface light source and irradiating the light to the image display panel 10. [ The light source includes at least one of a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), an external electro fluorescent lamp (EEFL), a flanged focal length (FFL), and a light emitting diode . The optical member includes a light guide plate, a diffusion plate, a prism sheet, a diffusion sheet, and the like to increase the surface uniformity of light from the light source.

4 to 5B, a unit pixel P formed on the display panel 10 includes an R subpixel SP _R , a G subpixel SP _G , and a B subpixel SP _B . To improve visibility of improving aperture ratio and a 3D image of the 2D and 3D images, each sub-pixel _{(SP R / SP G / SP} B) further includes a W sub-pixel (SP _W) on, and the bottom arranged in each stripe-like do.

The R, G and B subpixels SP _R / SP _G / SP _B and the W subpixel SP _W are dividedly driven. To this end, using the connection through the TFT in each of the sub-pixels _{(SP R / SP G / SP} B / SP W) is allocated to one of gate lines and one data line.

The R subpixel SP _R is driven by charging the first data voltage supplied from the first data line D ₁ in response to the gate pulse from the gate line G. [ The G subpixel SP _G is driven by charging the second data voltage supplied from the second data line D ₂ in response to the gate pulse from the gate line G. [ The B subpixel SP _B is driven by charging the third data voltage supplied from the third data line D ₃ in response to the gate pulse from the gate line G. [ The W subpixel SP _W is driven by charging a fourth data voltage supplied from the fourth data line D ₄ in response to a gate pulse from the gate line G. [

The display panel 10 displays a 2D image under the control of the controller 12 in the 2D mode (Mode_2D) and displays the 3D image under the control of the controller 12 in the 3D mode (Mode_3D).

When the display panel 10 is driven in the 3D mode (Mode_3D), R sub first data voltage is charged in the pixel (SP _R), G sub-pixel the second data voltage, and B sub-pixels to be filled in (SP _G) ( SP _B are the R, G, and B data voltages having the 3D data format as shown in FIG. 5A, respectively.

On the other hand, when the display panel 10 is driven in the 3D mode (Mode_3D), the fourth data voltage charged in the _W subpixel SPw is a black gradation voltage as shown in Fig. 5A. The black gradation voltage is displayed between vertically adjacent 3D images, thereby widening a display interval between the 3D images. That is, the W sub-pixel SP _W of the black gradation serves as a black stripe for increasing the vertical viewing angle of the stereoscopic image display apparatus.

As a result, the upper and lower viewing angles in the 3D mode (Mode_3D) are widely secured by the _W subpixel SP _{W to} which the black gradation voltage is applied, thereby improving visibility. Therefore, It is not necessary to form a wide width.

When the display panel 10 is driven in the 2D mode (Mode_2D), the first data voltage is charged in the R sub-pixel (SP _R) is an R data voltages having a 2D data format, filled in the G sub-pixel (SP _G) The second data voltage being the G data voltage having the 2D data format and the third data voltage being charged to the _B subpixel SP _B being the B data voltage having the 2D data format. The fourth data voltage charged in the _W subpixel SP _W is a W data voltage having a 2D data format.

Therefore, since the aperture ratio degradation problem in the 2D mode (Mode_2D) is prevented by the _W subpixel (SPW) vertically adjacent to the _B subpixel (SPB), the present invention improves the visibility of 2D and 3D images unlike the prior art It is possible to prevent the aperture ratio of the 2D image from deteriorating.

The upper and lower viewing angles of the 3D image are proportional to the ratio {(P2 * 100) / P1} of the vertical pitch (P1) of the R, G and B subpixels to the vertical pitch (P2) of the W subpixels, Is inversely proportional to the ratio {(P2 * 100) / P1}. Therefore, the vertical pitch (P1) of the R, G and B subpixels and the vertical pitch (P2) of the W subpixels should be appropriately designed in consideration of the upper and lower viewing angles of the 3D image and the luminance of the 3D image, (P2) is designed to be equal to or less than the vertical pitch (P1) of the R, G, and B subpixels.

The thus configured stereoscopic image display apparatus according to an embodiment of the present invention shows an increase in transmittance of 35.4% compared to a general RGB model in a 32-inch HD class display device.

As described above, the stereoscopic image display device according to an embodiment of the present invention includes R, G, B, and W subpixels, and when the 2D image is implemented, W is transmitted through W subpixels to improve the aperture ratio of the subpixels , And in displaying 3D images, there is an advantage in that visibility can be improved by displaying black in W subpixel and acting as a black stripe.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (6)

A display panel on which a 2D image or a 3D image is displayed;
A drive circuit for applying a data voltage of the 2D data format for the 2D image or a data voltage of the 3D data format for the 3D image to the display panel according to a driving method;
A controller for controlling the driving circuit in a driving mode of a 2D mode or a 3D mode; And
A first retarder and a second retarder disposed on the front surface of the display panel and disposed adjacent to each other along one direction to divide the light from the display panel into the first polarized light and the second polarized light in the 3D mode, And a pattern-type retarder,
Wherein the display panel includes R, G, B, and W subpixels divided and driven by a data line and a gate line, respectively,
Wherein the R, G, B, and W subpixels are arranged to be adjacent to each other along the one direction, wherein the W subpixels among the R, G, B, and W subpixels are disposed at the lowermost portion,
The R subpixel charges a first data voltage supplied from a first data line in response to a gate pulse from a gate line,
The G sub-pixel charges a second data voltage supplied from the second data line in response to a gate pulse from the gate line,
The B sub-pixel charges a third data voltage supplied from a third data line in response to a gate pulse from the gate line,
The W subpixel charges and drives a fourth data voltage supplied from the fourth data line in response to a gate pulse from the gate line,
The data voltages of the 2D data format are applied to the R, G, B and W subpixels in the 2D mode, and the data voltages of the 3D data format are applied to the R, G and B subpixels in the 3D mode And a black gradation voltage is applied to the W subpixel.
delete The method according to claim 1,
In the 2D mode, the first data voltage is an R data voltage in a 2D data format, the second data voltage is a G data voltage in a 2D data format, the third data voltage is a B data voltage in a 2D data format, And the fourth data voltage is a W data voltage in a 2D data format.
The method according to claim 1,
In the 3D mode, the first, second, and third data voltages are R, G, and B data voltages of the 3D data format, respectively, and the fourth data voltage is the black gradation voltage.
The method according to claim 1,
Wherein the ratio of the vertical pitch of the W subpixel to the total vertical pitch of the subpixels is determined in consideration of the viewing angle of the 3D image and the luminance of the 3D image.
The method according to claim 1,
Wherein the first polarized light and the second polarized light exhibit polarization characteristics perpendicular to each other.

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