KR20120059953A - 3 Dimensional Display Device Having Patterned Retarder Reducing Cross-Talk - Google Patents

Abstract

The present invention relates to a three-dimensional image display apparatus using a patterned retarder that improves luminance and aperture ratio while reducing cross-talk between a left eye image and a right eye image. A three-dimensional image display apparatus using a patterned retarder according to the present invention comprises: a display panel; A lens layer attached to an outer side of the display panel; And a patterned retarder attached to the lens layer. The three-dimensional image display device using the patterned retarder according to the present invention further includes a condenser lens in each of the left eye pixel area and the right eye pixel area, concentrating the left eye image and the right eye image in the front direction of the display device. To reduce cross talk.

Description

3D Video Display Using Patterned Retarder Reducing Cross-Talk}

The present invention relates to a structure of a three-dimensional image display apparatus of a patterned retarder method which reduces cross-talk between a left eye image and a right eye image. In particular, the present invention relates to a three-dimensional image display apparatus using a patterned retarder which improves luminance and aperture ratio while reducing cross-talk between a left eye image and a right eye image.

Recently, with the development of various video contents, a display device capable of selectively implementing 2D images and 3D images has emerged. In order to realize a 3D image, the display device uses a stereoscopic technique or an autostereoscopic technique.

The binocular parallax uses a parallax image of the left and right eyes with a large stereoscopic effect, and there are glasses and no glasses, both of which are put to practical use. The spectacle method displays polarized images by changing the polarization direction of the left and right parallax images on a direct-view display device or a projector or time-division method, and implements a stereoscopic image using polarized glasses or liquid crystal shutter glasses. An optical plate, such as a parallax barrier, is installed in front of or behind the display screen to separate the display.

An example of the spectacle method is a three-dimensional image display apparatus in which a patterned retarder is disposed on a display panel. This 3D image display device uses the polarization characteristics of the patterned retarder and the polarization characteristics of the polarized glasses worn by the user to implement the 3D image, and crosstalk of the left and right eyes in the 3D image as compared to other 3D images. Its small size and excellent brightness have the advantage of excellent image quality.

However, since the 3D image display apparatus using the patterned retarder simultaneously displays the left eye image and the right eye image on one screen, crosstalk between the left eye image and the right eye image still exists due to spatial constraints. In addition, in order to reduce crosstalk, the area representing the left eye image and the right eye image should be reduced. In this case, the aperture ratio of the area displaying the left eye image and the area representing the right eye image is reduced, resulting in a decrease in luminance of the entire display device. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and to provide a patterned retarder type three-dimensional image display device which reduces cross talk between a left eye image and a right eye image. Another object of the present invention is to provide a patterned retarder type three-dimensional image display device having an improved aperture ratio while reducing cross talk. It is still another object of the present invention to provide a patterned retarder type three-dimensional image display device which reduces cross talk and improves aperture ratio and luminance.

According to an aspect of the present invention, there is provided a three-dimensional image display apparatus using a patterned retarder, including: a display panel; A lens layer attached to an outer side of the display panel; And a patterned retarder attached to the lens layer.

The lens layer is characterized in that it comprises a condenser lens.

The display panel includes a left eye pixel area representing a left eye image and a right eye pixel area representing a right eye image; The lens layer includes a first condensing lens formed over the left eye pixel region and a second condensing lens formed over the right eye pixel region; The patterned retarder may include a first retarder allocated to the left eye pixel area and a second retarder assigned to the right eye pixel area.

The left eye pixel area and the right eye pixel area respectively extend in the horizontal direction of the display panel and are alternately arranged in the vertical direction.

The lens layer may be a semi-cylindrical lenticular lens formed over each of the left eye pixel area and the right eye pixel area.

The lens layer is configured to focus light emitted from the left eye pixel area to the first retarder and to focus light emitted from the right eye pixel area to the second retarder.

The display panel may further include a first black matrix formed between the left eye pixel area and the right eye pixel area.

The patterned retarder may further include a second black matrix formed between the first retarder and the second retarder.

The first black matrix and the second black matrix have the same size and are completely overlapped with each other.

The second black matrix has a smaller size than the first black matrix and is formed to overlap in the first black matrix region.

The display panel may include a liquid crystal display panel, an electroluminescent display panel, a plasma display panel, an organic light emitting diode display panel, and an inorganic light emitting diode display panel.

The three-dimensional image display device using the patterned retarder according to the present invention further includes a condenser lens in each of the left eye pixel area and the right eye pixel area, concentrating the left eye image and the right eye image in the front direction of the display device. To reduce cross talk. In addition, the present invention can improve the aperture ratio because crosstalk does not occur even if the maximum size of the left eye image area and the right eye image area is secured. In addition, the amount of light lost by the black matrix separating the left eye image and the right eye image can be refracted into the aperture region, thereby further improving luminance.

1 is a schematic diagram showing a structure of a three-dimensional imaging system using a patterned retarder according to the present invention.
2 is a cross-sectional view showing the structure of a three-dimensional image display panel using a patterned retarder according to the first embodiment of the present invention.
3 is a cross-sectional view showing the structure of a three-dimensional image display panel using a patterned retarder in which the position of the condenser lens is changed in the first embodiment of the present invention;
4 is a cross-sectional view showing the structure of a three-dimensional image display panel using a patterned retarder according to the second embodiment of the present invention.
FIG. 5 is a cross-sectional view showing the structure of a three-dimensional image display panel using a patterned retarder in which the position of the condenser lens is changed in the second embodiment of the present invention; FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention. 1 shows a three-dimensional imaging system using a patterned retarder according to the present invention. Referring to FIG. 1, a three-dimensional imaging system according to the present invention includes a display panel DP for implementing 2D or 3D images, a patterned retarder PR attached to a front surface of the display panel DP, and polarization. Glasses PG and the like.

The display panel DP includes an electric field including a liquid crystal display panel, a field emission display panel, a plasma display panel, and an inorganic electroluminescent device and an organic light emitting diode device (OLED). The display panel may be implemented as a flat panel display device such as an electroluminescence device (EL). Hereinafter, a case in which the display panel DP is implemented as a liquid crystal display panel will be described. The patterned retarder PR and the polarizing glasses PG are 3D driving elements that separate binocular parallax by separating a left eye image and a right eye image.

In the display panel DP, a liquid crystal layer LC is formed between two glass substrates. The display panel DP includes liquid crystal cells arranged in a matrix by a cross structure of data lines and gate lines. A pixel array including data lines, gate lines, a TFT, a pixel electrode, and a storage capacitor is formed on the lower glass substrate SL of the display panel DP. The liquid crystal cells are driven by an electric field between the pixel electrodes connected to the TFT and the common electrode. The black matrix, the color filter, and the common electrode are formed on the upper glass substrate SU of the display panel DP. An alignment layer for setting a pre-tilt angle of the liquid crystal is formed in each of the upper glass substrate SU and the lower glass substrate SL of the display panel DP. The upper polarizing film PU and the lower polarizing film PL are attached to the outside of the upper glass substrate SU and the lower glass substrate SL of the display panel DP. The common electrode is formed on the upper glass substrate (SU) in the vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode, and is connected to IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. In the same horizontal electric field driving method, a pixel electrode is formed on the lower glass substrate SL. A column spacer for maintaining a cell gap of the liquid crystal cell may be formed between the glass substrates.

The display panel DP may be implemented in any liquid crystal mode as well as the TN mode, VA mode, IPS mode, and FFS mode. The liquid crystal display of the present invention may be implemented in any form, such as a transmissive display, a transflective display, a reflective display. In the transmissive display device and the transflective display device, a backlight unit is required. The backlight unit may be implemented as a direct type backlight unit or an edge type backlight unit.

The patterned retarder PR is attached to the outside of the upper polarizing film PU of the display panel DP. In the patterned retarder PR, unit retarders corresponding to each line having one line of pixels arranged in the horizontal direction of the display panel DP as a basic unit are arranged. For example, one unit retarder is allocated to correspond to an area of pixels commonly connected to one gate line. In particular, the first retarder RT1 is assigned to the odd lines of the patterned retarder PR, and the second retarder RT2 is assigned to the even lines of the patterned retarder PR. do. The light transmission axis of the first retarder RT1 and the light transmission axis of the second retarder RT2 are perpendicular to each other. The first retarder RT1 transmits a first polarization (circular polarization or linear polarization) of light incident from the pixel array. The second retarder RT2 transmits a second polarization (circular polarization or linear polarization) of light incident from the pixel array. The first retarder RT1 of the patterned retarder PR may be implemented as a polarization filter that transmits left circularly polarized light, and the second retarder RT2 of the patterned retarder PR transmits right circularly polarized light. It may be implemented as a polarization filter.

The polarizing glasses PG include a left eyeglass window LG having a first polarizing filter P1 and a right eyeglass window RG having a second polarizing filter P2. The first polarizing filter P1 has the same light transmission axis as that of the first retarder RT1 of the pattern retarder PR. The second polarization filter P2 has the same light transmission axis as that of the second retarder RT2 of the pattern retarder PR. For example, the first polarization filter P1 of the polarizing glasses PG may be selected as the left circle polarization filter, and the second polarization filter P2 of the polarizing glasses PG may be selected as the right polarization filter.

In this structure, a 3D image may be implemented by displaying a left eye image in pixels corresponding to the first retarder RT1 and a right eye image in pixels corresponding to the second retarder RT2. For example, when the first retarder RT1 has the same pattern as the left circle polarization filter, the left eye image is emitted in a left circle polarized state, and the first retarder RT1 is left only by the first polarization filter P1 of the polarizing glasses PG. It is recognized as the left eye. At the same time, when the second retarder RT2 has the same pattern as the right polarized light filter, the right eye image is emitted in the right polarized state, and the user's right eye is only by the second polarized filter P2 of the polarizing glasses PG. Is recognized.

A detailed embodiment of a display panel unit in a 3D image display apparatus using a patterned retarder having such a structure will be described. 2 is a cross-sectional view showing the structure of a three-dimensional image display panel using a patterned retarder according to the first embodiment of the present invention. 3 is a cross-sectional view illustrating a structure of a three-dimensional image display panel using a patterned retarder in which the position of the condenser lens is changed in the first exemplary embodiment of the present invention.

First, referring to FIG. 2, a three-dimensional image display panel using a patterned retarder according to Embodiment 1 of the present invention includes a flat panel display such as a liquid crystal display panel, an organic light emitting display, a plasma display, and the like. Since various flat panel display devices can be used, the following description will representatively describe a case of a liquid crystal display device.

The liquid crystal display panel includes an upper substrate having a color filter, a lower substrate having a thin film transistor, and a liquid crystal layer interposed between the upper substrate and the lower substrate. For convenience, the description will be made mainly on the upper substrate on which the color filter is formed.

As shown in FIG. 2, a color filter CF assigned to a pixel region is formed on an inner surface of the upper substrate SU, and a black matrix BM intermixes colors between the color filters CF. It is formed to prevent. The upper polarizing plate PU is attached to the outer surface of the upper substrate SU. The lens layer LE on which the plurality of condenser lenses is formed is attached on the upper polarizer PU. The patterned retarder PR is attached to the lens layer LE.

The condenser lens formed on the lens layer LE condenses the light emitted from one pixel to be parallel to the central virtual line of the pixel and sends the light to the patterned retarder PR. The arrow of FIG. 2 shows that the light emitted from the color filter CF, which is the pixel region, condenses to the patterned retarder region allocated to the condenser lens of the lens layer LE.

The first retarder RT1 is assigned to the odd lines of the patterned retarder PR, and the second retarder RT2 is assigned to the even lines of the patterned retarder PR. For example, the first retarder RT1 may be assigned to the color filter L of the left eye pixel, and the second retarder RT2 may be assigned to the color filter R of the right eye pixel. A black matrix BMP is also formed between the first retarder RT1 and the second retarder RT2, so that the right eye image is incident on the first retarder RT1 or the left eye image is the second retarder RT2. It prevents crosstalk between the left eye image and the right eye image by blocking the incident light. Since the black matrix BMP formed on the patterned retarder PR is to prevent cross talk between the left image and the right image, it is preferable to have a wider width than the black matrix BM formed between the color filters CF. Do. As a result, the aperture ratio of the display panel may be lower than that of the liquid crystal display panel, and the luminance may be lowered due to the amount of light blocked by the black matrix BMP formed in the patterned retarder PR.

Accordingly, in the lens layer LE, the first lenticular lens L1 having one semi-cylindrical shape is formed over the first retarder RT1 region, and the other one over the second retarder RT2 region is formed. It is preferable that the second lenticular lens L2 having two semi-cylindrical shapes is formed. In this case, the light emitted from the color filter L in the left eye pixel area is condensed to the first retarder RT1 area by the first lenticular lens L1 of the lens layer LE. In addition, the light emitted from the color filter R in the right eye pixel area is condensed to the second retarder RT1 area by the second lenticular lens L2 of the lens layer LE.

Therefore, the amounts of light blocked by the black matrix BMP of the patterned retarder and not emitted to the outside of the display panel are also emitted through the retarder area by the lens layer LE. As a result, it is possible to obtain a high quality product in which the amount of light is increased and the luminance is improved. In addition, the size of the black matrix BMP of the patterned retarder may have the same size as that of the black matrix BM of the color filter CF or may be formed in a smaller size. When the black matrix BMP of the patterned retarder PR has the same size as the black matrix BM of the color filter CF, the black matrix BMP of the patterned retarder PR is disposed to overlap at the same position in the vertical position when viewed from the front of the display panel. It is preferable. On the other hand, when the black matrix BMP of the patterned retarder PR has a smaller size than the black matrix BM of the color filter CF, the patterned retarder PR is viewed from the front of the display panel. The black matrix BMP is preferably arranged to overlap within the region of the black matrix BM of the color filter CF.

More preferably, as shown in FIG. 3, the patterned retarder PR may not include a black matrix. Even if there is no black matrix BMP of the patterned retarder PR, the light emitted from the left eye color filter by the lens layer LE is collected by the first retarder RT1, and the light emitted from the right eye color filter is zero. Since the light is condensed by the two retarders RT2, crosstalk between the left eye image and the right eye image can be prevented.

In the patterned retarder type 3D display panel according to the present invention, the black matrix for preventing crosstalk between the left eye retarder and the right eye retarder can be minimized or deleted, thereby improving aperture ratio and increasing luminance. .

In Example 1, the case where the lens layer LE is formed between the display panel and the patterned retarder PR is described. In another embodiment, the lens layer LE may be formed on the patterned retarder PR. 4 is a cross-sectional view illustrating a structure of a three-dimensional image display panel using a patterned retarder according to a second embodiment of the present invention. 4 illustrates an example in which the lens layer LE is formed outside the patterned retarder PR in the case of Embodiment 1 of FIG. 2. Since only the position of the lens layer LE is different, other configurations are the same, and the function of the lens layer LE is also the same, and thus, detailed description thereof will be omitted.

FIG. 5 is a cross-sectional view illustrating a structure of a three-dimensional image display panel using a patterned retarder in which the position of the condenser lens is changed in the second exemplary embodiment of the present invention. FIG. 5 illustrates an example in which the lens layer LE is formed outside the patterned retarder PR in the case of Embodiment 1 of FIG. 3. Similarly, since only the positions of the lens layer LE are different, other configurations are the same, and the functions of the lens layer LE are also the same, and thus detailed description thereof will be omitted.

In the second embodiment, the lens layer LE is the same so that the light in the left eye area and the light in the right eye area are focused in each retarder area. However, the first embodiment in which the left eye image is condensed with the first retarder RT1 before passing through the first retarder RT1 shows better performance in terms of preventing cross talk.

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 invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

DP: Display panel SL: Lower glass substrate
SU: upper glass substrate PL: lower polarizing film
PU: upper polarizing film PG: polarizing glasses
P1: first polarizing filter P2: second polarizing filter
RG: right eye view LG: left eye view
PR: Patterned Retarder RT1: First Retarder
RT2: Second retarder BM: Black matrix (of color filter)
BMP: Black Matrix (Pattern Retarder)
L: Color filter in left eye pixel area R: Color filter in right eye pixel area
L1: first lenticular lens L2: second lenticular lens

Claims (11)

Display panel;
A lens layer attached to an outer side of the display panel; And
And a patterned retarder attached to the lens layer.
The method of claim 1,
And the lens layer comprises a condenser lens.
The method of claim 1,
The display panel includes a left eye pixel area representing a left eye image and a right eye pixel area representing a right eye image;
The lens layer includes a first condensing lens formed over the left eye pixel region and a second condensing lens formed over the right eye pixel region;
The patterned retarder may include a first retarder allocated to the left eye pixel area and a second retarder assigned to the right eye pixel area.
The method of claim 3, wherein
And the left eye pixel area and the right eye pixel area respectively extend in the horizontal direction of the display panel and are alternately arranged in the vertical direction.
The method of claim 4, wherein
The lens layer includes a semi-cylindrical lenticular lens formed over each of the left eye pixel area and the right eye pixel area.
The method of claim 3, wherein
And the lens layer condenses the light emitted from the left eye pixel region to the first retarder and the light emitted from the right eye pixel region to the second retarder.
The method of claim 3, wherein
The display panel further includes a first black matrix formed between the left eye pixel area and the right eye pixel area.
The method of claim 7, wherein
The patterned retarder may further include a second black matrix formed between the first retarder and the second retarder.
The method of claim 7, wherein
And the first black matrix and the second black matrix have the same size and completely overlap each other.
The method of claim 7, wherein
And wherein the second black matrix has a smaller size than the first black matrix and overlaps within the first black matrix area.
The method of claim 1,
The display panel includes a liquid crystal display panel, an electroluminescent display panel, a plasma display panel, an organic light emitting diode display panel, and an inorganic light emitting diode display panel.

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