KR102034044B1 - Stereoscopic image display device and driving method the same - Google Patents

Stereoscopic image display device and driving method the same Download PDF

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KR102034044B1
KR102034044B1 KR1020120141700A KR20120141700A KR102034044B1 KR 102034044 B1 KR102034044 B1 KR 102034044B1 KR 1020120141700 A KR1020120141700 A KR 1020120141700A KR 20120141700 A KR20120141700 A KR 20120141700A KR 102034044 B1 KR102034044 B1 KR 102034044B1
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mode
data
display panel
sub
voltage
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KR1020120141700A
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KR20140073807A (en
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함정현
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones

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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

The present invention relates to a stereoscopic image display device and a driving method thereof, comprising: a display panel displaying a 2D image or a 3D image; A driving circuit for supplying a data voltage in a 2D format or a data voltage in a 3D format to a pixel matrix of the display panel according to a driving scheme; A timing controller controlling the driving circuit in a 2D mode or a 3D mode driving method; A patterned retarder disposed in front of the display panel and dividing light provided from the display panel into first and second polarized lights in the 3D mode; The pixel matrix has R, G, B, W sub pixels arranged in quad type; In the 3D mode, the black gray voltage is applied to the subpixels arranged in the 3n (n is a natural number) row of the pixel matrix.

Description

STEREOSCOPIC IMAGE DISPLAY DEVICE AND DRIVING METHOD THE SAME

The present invention relates to a stereoscopic image display device and a driving method thereof.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, an OLED display, and the like, and most of them are commercially available.

Meanwhile, in order to enjoy a realistic and stereoscopic image, a 3D driving technology for expressing a 3D image has been developed, and a 3D driving technology is applied to the flat panel display devices. 3D driving technology is largely divided into glasses method and glasses-free method, and glasses method is divided into polarized glasses method and shutter glasses method. Specifically, the polarizing glasses method is a method of changing the polarization direction of the left and right parallax images displayed on the flat panel display device, and the shutter glasses method is a method of time-divisionally displaying the left and right parallax images displayed on the flat panel display device.

The flat panel display device of the polarizing glasses method further includes a polarizing layer including a patterned retarder. To serve.

However, the polarized glasses method has a problem in that visibility of 3D images is poor due to 3D crosstalk generated at upper and lower viewing angle positions. In the 3D crosstalk, the left eye image passes through the right eye patterned retarder area as well as the left eye patterned retarder area at the upper / lower viewing angle position, and the right eye image R as well as the left eye patterned retarder area as well. Occurs because it passes through the area.

Accordingly, as shown in FIG. 1, a method of increasing the upper and lower viewing angles and increasing the visibility of the 3D image by forming a black stripe (BS) region on the display panel has been proposed. However, although the black stripe (BS) type stereoscopic image display device can reduce crosstalk when implementing 3D images, the aperture ratio is reduced when implementing 2D images.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a stereoscopic image display device and a driving method thereof capable of improving 3D crosstalk while implementing 3D images while improving aperture ratio when implementing 2D images.

In order to achieve the above object, a stereoscopic image display device according to an embodiment of the present invention includes a display panel for displaying a 2D image or a 3D image; A driving circuit for supplying a data voltage in a 2D format or a data voltage in a 3D format to a pixel matrix of the display panel according to a driving scheme; A timing controller controlling the driving circuit in a 2D mode or a 3D mode driving method; A patterned retarder disposed in front of the display panel and dividing light provided from the display panel into first and second polarized lights in the 3D mode; The pixel matrix has R, G, B, W sub pixels arranged in quad type; In the 3D mode, the black gray voltage is applied to the subpixels arranged in the 3n (n is a natural number) row of the pixel matrix.

The G sub-pixels are disposed to be adjacent to each other in the horizontal direction with the B sub-pixels, to be adjacent to each other in the vertical direction to the R sub-pixels, and to be adjacent to each other in the diagonal direction to the W sub-pixels. .

The driving circuit supplies the data voltage of the 2D format consisting of RGBW data voltages to the plurality of data lines in the 2D mode, and the RGBW data voltages and the black gradation voltage to the plurality of data lines in the 3D mode. A data driver for supplying a data voltage of the 3D format; And a gate driver for sequentially supplying scan signals to the plurality of gate lines.

The data driver may supply the black gray voltage to the plurality of data lines in three horizontal periods in the 3D mode.

In addition, in order to achieve the above object, the driving method of the stereoscopic image display apparatus according to an embodiment of the present invention is that the R, G, B, W sub-pixels are arranged in a quad type to display a 2D image or 3D image And a display panel having a pixel matrix, and a patterned retarder disposed in front of the display panel and dividing light provided from the display panel into first and second polarized lights in the 3D mode. A driving method of the method, comprising: sequentially supplying scan signals to the plurality of gate lines by the driving circuit; Supplying a data voltage of a 2D format or a data voltage of a 3D format to the pixel matrix in accordance with a driving scheme of a 2D mode or a 3D mode; And supplying the data voltage of the 3D format to the pixel matrix by the driving circuit includes supplying a black gray voltage to subpixels arranged in a 3n (n is a natural number) row of the pixel matrix. It is done.

And supplying the data voltage of the 3D format to the pixel matrix by the driving circuit includes supplying the black gray voltage to the plurality of data lines in three horizontal periods in the 3D mode. It is done.

When the 3D image is implemented, the upper and lower viewing angles are widened to reduce 3D crosstalk, while in the 2D image, the aperture ratio is improved according to the deletion of the black stripe region, thereby improving the luminance. In addition, the present invention improves the luminance compared to the method of driving the R, G, and B sub pixels by adding the W sub pixel.

1 is a view for explaining a black stripe (BS) region.
2 is a block diagram of a stereoscopic image display device according to an exemplary embodiment of the present invention.
3 is a view illustrating in detail the display panel 10 and the driving circuit 14 shown in FIG. 2.
4A and 4B are diagrams illustrating a driving method of the 2D mode or the 3D mode of the present invention.

Hereinafter, a stereoscopic image display device and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a stereoscopic image display device according to an exemplary embodiment of the present invention. 3 is a view illustrating in detail the display panel 10 and the driving circuit 14 shown in FIG. 2.

The stereoscopic image display device shown in FIG. 2 includes a display element 11, a timing controller 12, a drive circuit 14, a patterned retarder 18, and polarizing glasses 20.

The display element 11 is a device for displaying 2D and 3D images, and includes a liquid crystal display (LCD), a field emission display (FED), and a plasma display panel (PDP). And a flat panel display such as an organic light emitting diode (OLED). Hereinafter, for convenience of description, the display element 11 is described as a liquid crystal display.

When the display element 11 is a liquid crystal display device, the stereoscopic image display device includes an upper portion disposed between the backlight unit 17 disposed under the display panel 10, the display panel 10, and the patterned retarder 18. A polarizing film 16a, a lower polarizing film 16b disposed between the display panel 10 and the backlight unit 17 is provided.

The patterned retarder 18 is attached to the upper polarizing film 16a of the display panel 10. A first retarder is formed in the odd display lines of the patterned retarder 18, and a second retarder is formed in the even display lines of the patterned retarder 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 is opposed to the odd rows of the pixel matrix and transmits light of the first polarized light (circular polarized light or linear polarized light) among the light incident from the odd rows of the pixel matrix. The second retarder transmits the light of the second polarized light (circular polarization or linear polarization) among the light incident from the even row of the pixel matrix opposite to the even row of the pixel matrix. The first retarder may be implemented as a polarization filter that transmits left circularly polarized light, and the second retarder may be implemented as a polarization filter that transmits right circularly polarized light.

The polarizing glasses 20 include a left eye polarization filter and a right eye polarization filter. The left eye polarizing filter has the same light absorption axis as the first retarder of the patterned retarder 18. The right eye polarizing filter has the same light absorption axis as the second retarder of the patterned retarder 18. For example, the left eye polarization filter of the polarizing glasses 20 may be set as a left circle polarization filter, and the right eye polarization filter of the polarizing glasses 20 may be set as a right circular polarization filter.

The display panel 10 has two substrates and a liquid crystal layer interposed therebetween.

A TFT array (Thin Film Transistor Array) is formed on the lower substrate of the display panel 10. The TFT array includes a plurality of data lines supplied with a data voltage, a plurality of gate lines crossing the data lines to supply a scan signal, and a plurality of TFTs formed at intersections of the data lines and the gate lines. ), A plurality of pixel electrodes for charging the data voltages to the liquid crystal cells, and a storage capacitor connected to the pixel electrodes to maintain the voltage of the liquid crystal cells.

A color filter array is formed on the upper substrate of the display panel 10. The color filter array includes a black matrix and a color filter. Meanwhile, the display panel includes a common electrode that forms an electric field together with the pixel electrode. The common electrode is formed on the upper substrate in a vertical electric field driving scheme such as twisted nematic (TN) mode and vertical alignment (VA) mode. In a horizontal electric field driving method such as an in plane switching mode (Fringe Field Switching) mode and a FF mode (Fringe Field Switching) mode, a pixel electrode is formed on the lower substrate.

The upper polarizing film 16a is attached to the upper substrate of the display panel 10, and the lower polarizing film 16b is attached to the lower substrate of the display panel 10.

The present invention forms a pixel matrix on the display panel 10 having R, G, B, and W subpixels driven by a plurality of data lines DL and a plurality of gate lines GL and arranged in a quad type. In the 3D mode, a black gray voltage is applied to the subpixels arranged in the 3n-th row of the pixel matrix. The present invention can widen the upper and lower viewing angles and reduce the 3D crosstalk in the 3D mode and prevent the reduction of the aperture ratio in the 2D mode without forming a separate black stripe BS on the display panel 10. . This will be described later in detail with reference to FIGS. 4A and 4B.

Referring to FIG. 3, the driving circuit 14 supplies a data voltage in a 2D format or a data voltage in a 3D format to a pixel matrix of the display panel 10 according to a driving scheme. Specifically, the driving circuit 14 supplies the data voltage of the 2D format composed of the RGBW data voltages to the plurality of data lines DL in the 2D mode, and the RGBW data voltages to the plurality of data lines DL in the 3D mode. And a data driver 20 for supplying a data voltage of a 3D format including a black gradation voltage and a gate driver 22 for sequentially supplying scan signals to a plurality of gate lines GL in 2D mode and 3D mode. .

The data driver 20 is controlled according to the data control signal DCS provided from the timing controller 12. The data driver 20 latches the image data RGBW provided from the timing controller 12 and converts the latched data into a data voltage using a gamma voltage. The converted data voltages are supplied to the plurality of data lines DL in one horizontal period period.

The data driver 20 supplies a data voltage of a 2D format composed of RGBW data voltages to a plurality of data lines DL in one horizontal period period in the 2D mode. In the 3D mode, the 3D format data voltage including the RGBW data voltages and the black gradation voltage is supplied to the plurality of data lines DL in one horizontal period, and the black gradation voltage is supplied to the plurality of data lines DL in three horizontal periods. Supply at intervals. Accordingly, in the pixel matrix of the display panel 10, a black gray voltage is applied to the subpixels arranged in the 3n-th row in the 3D mode.

The gate driver 22 is controlled according to the gate control signal GCS provided from the timing controller 12. The gate driver 2 generates a scan signal in the 2D mode and the 3D mode, and sequentially supplies the scan signal to the plurality of gate lines GL.

The timing controller 12 converts three-color image data RGB input from the outside into four-color image data RGBW. The converted four-color image data RGBW is arranged in units of frames and supplied to the data driver 4. The timing controller 8 generates the gate control signal GCS and the data control signal DCS based on the timing synchronization signal SYNC, and supplies them to the gate driver 6 and the data driver 4, respectively. To control them. The timing synchronization signal SYNC may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal Data Enable, a dot clock DCLK, and the like. The gate control signal GCS may be a gate start pulse, a gate shift clock, a gate output enable, or the like. The data control signal DCS may be a source start pulse, a source sampling clock, a source output enable, or the like.

The timing controller 12 according to the 2D / 3D mode selection signal input through the user interface or the 2D / 3D mode identification code extracted from the input three-color image data RGB, the mode control signal Mode 2D / 3D. Is generated and supplied to the data driver 4 to control the driving mode of the data driver 4.

The backlight unit 17 includes one or more light sources and a plurality of optical members that convert light from the light sources into surface light sources and irradiate the display panel 10. The light source includes any one or more light sources of Hot Cathode Fluorescent Lamp (HCFL), Cold Cathode Fluorescent Lamp (CCFL), External Electrode Fluorescent Lamp (EEFL), Flange Focal Length (FFL), and Light Emitting Diode (LED). . The optical member includes a light guide plate, a diffusion plate, a prism sheet, a diffusion sheet, and the like to improve uniformity and efficiency of light from the light source.

Meanwhile, the pixel matrix of the display panel 10 includes R, G, B, and W sub pixels, and the R, G, B, and W sub pixels are arranged in a quad type. Specifically, the G subpixels and the B subpixels are alternately arranged in the odd rows of the pixel matrix, and the R subpixels and the W subpixels are alternately arranged in the even rows of the pixel matrix. The G subpixels and the W subpixels are disposed adjacent to each other in a diagonal direction.

4A and 4B are diagrams illustrating a driving method of the 2D mode or the 3D mode of the present invention. Specifically, FIG. 4A is a diagram illustrating a driving method of the 2D mode, and FIG. 4B is a diagram illustrating a driving method of the 3D mode.

Referring to FIG. 4A, in the 2D mode, the 3D image display device of the present invention supplies a data voltage of 2D format composed of RGBW data voltages to a plurality of data lines DL in one horizontal period period in a 2D mode. . Accordingly, in the pixel matrix, RGBW data voltages are respectively applied to the R, G, B, and W sub pixels. In the present invention, in the 2D mode, the brightness is improved compared to the method of driving the R, G, and B sub pixels by adding the W sub pixels.

Referring to FIG. 4B, in the 3D mode of the present invention, in the 3D mode, the data driver 20 horizontally transmits a data voltage of 3D format composed of RGBW data voltages and black gray voltage to one or more data lines DL. The black gray voltage is supplied to the plurality of data lines DL in three horizontal periods. Accordingly, the black gradation voltage is applied to the subpixels arranged in the 3n-th row, and the RGBW data voltages are applied to the subpixels arranged in the remaining rows of the pixel matrix. In the present invention, in the 3D mode, by allowing the sub-pixels arranged in the 3n-th row of the pixel matrix to display the black gray level, the upper and lower viewing angles can be widened and the 3D crosstalk can be reduced.

Figure 112012101731987-pat00001

Table 1 is a table showing a simulation for explaining the effects of the present invention.

Referring to Table 1, in the conventional black stripe (BS) type stereoscopic image display device, the luminance in the 2D mode, the luminance in the 3D mode were 450 nit and 170 nit, respectively, and the upper and lower viewing angles were measured at a maximum of 20 degrees. In the stereoscopic image display device in which the black stripe (BS) is removed, the luminance in the 2D mode, the luminance in the 3D mode is 360 nit, and the 1350 nit, respectively, and the upper and lower viewing angles are measured to be at most 10 °. Meanwhile, in the 3D image display device according to the present invention, the luminance in the 2D mode and the luminance in the 3D mode were 675 nit and 300 nit, respectively, and the upper and lower viewing angles were measured to be 30 ° at maximum.

Therefore, as shown in Table 1, it can be seen that the present invention improves luminance by widening the upper and lower viewing angles when implementing 3D images to reduce 3D crosstalk while improving aperture ratio by deleting black stripe regions when implementing 2D images. have. In addition, the present invention can be seen that the luminance is improved compared to the method of driving the R, G, B sub-pixel by adding the W sub-pixel.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

11: display element 12: timing controller
14: drive circuit 16a: upper polarizing film
16b: lower polarizing film 17: backlight unit
18: patterned retarder 20: polarized glasses

Claims (7)

A display panel displaying a 2D image or a 3D image;
A driving circuit for supplying a data voltage in a 2D format or a data voltage in a 3D format to a pixel matrix of the display panel according to a driving scheme;
A timing controller controlling the driving circuit in a 2D mode or a 3D mode driving method;
A patterned retarder disposed in front of the display panel and dividing light provided from the display panel into first and second polarized lights in the 3D mode;
The pixel matrix has R, G, B, W sub pixels arranged in quad type;
In the 3D mode, a black gray voltage is applied to subpixels arranged in a 3n (n is a natural number) row of the pixel matrix, and RGBW data voltages are applied to subpixels arranged in the remaining rows, respectively. And the sub-pixels having the same color are symmetrical to each other in the upper and lower rows to which the RGBW data voltages are applied based on the applied 3n-th row. The method according to claim 1,
The G sub pixel
Disposed adjacent to each other in the horizontal direction with the B sub-pixel,
Disposed adjacent to each other in the vertical direction with the R sub-pixel,
And the W sub-pixels adjacent to each other in a diagonal direction. The method according to claim 1,
The driving circuit
Supply the data voltage of the 2D format composed of RGBW data voltages to a plurality of data lines in the 2D mode, and the 3D format composed of the RGBW data voltages and the black gradation voltage to the plurality of data lines in the 3D mode A data driver for supplying a data voltage of the data driver;
And a gate driver for sequentially supplying scan signals to the plurality of gate lines. The method according to claim 3,
The data driver
And supplying the black gradation voltages to the plurality of data lines in three horizontal periods in the 3D mode. delete delete delete
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KR100542769B1 (en) * 2003-06-26 2006-01-20 엘지.필립스 엘시디 주식회사 Liquid Crystal Display And Driving Method Thereof
KR100928267B1 (en) * 2008-03-18 2009-11-24 엘지전자 주식회사 Stereoscopic display
KR20110103182A (en) * 2010-03-12 2011-09-20 삼성전자주식회사 3 dimensional image display device
KR101224461B1 (en) * 2010-03-31 2013-01-22 엘지디스플레이 주식회사 Stereoscopic image display and driving method thereof
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