KR20210094740A - Stereoscopic display apparatus - Google Patents

Abstract

A stereoscopic display device according to one embodiment of the present invention includes: a display panel in which a plurality of sub-pixels are defined and implementing the n number of views; and a parallax barrier disposed on one surface of the display panel, wherein n is an integer of 2 or more, and p and q are divisors of n. In the display panel, the q number of sub-pixels adjacent in a row direction constitute one unit row, and the n number of views are implemented by the p number of unit rows adjacent to each other in a column direction. An objective of the present invention is to provide the stereoscopic display device capable of improving luminance and resolution while realizing multiple views in a display panel having a horizontal stripe pixel arrangement.

Description

Stereoscopic display device {STEREOSCOPIC DISPLAY APPARATUS}

The present invention relates to a stereoscopic display device.

The three-dimensional image display technology is a technology to feel a three-dimensional effect due to binocular parallax in which a difference occurs between images of a left eye and a right eye. A method of viewing a 3D image may be largely divided into a glasses method and a glasses-free method. The glasses method is inconvenient to wear glasses, and it may be difficult to observe objects other than a stereoscopic image while wearing glasses. Accordingly, research on the glasses-free method is being actively conducted.

The glasses-free method can be largely divided into a lenticular method using a cylindrical lens and a parallax barrier method using a light transmitting part and a light blocking part. In the lenticular method, since a lens is used, a problem of image distortion may occur. On the other hand, the parallax barrier method has the advantage of allowing three-dimensional viewing from various locations.

However, when a multi-view stereoscopic image is implemented using the parallax barrier method, the ratio of the light-transmitting part is very low. That is, when the number of n views is implemented, the ratio of the light-transmitting part to the light-shielding part becomes 1: (n-1), and the ratio of the light-transmitting part is inevitably low. As such, when the ratio of the light-transmitting part is lowered, the ratio of the portion displaying an image in the display device is reduced, and thus the resolution may be deteriorated.

An object of the present invention is to provide a stereoscopic display device capable of improving luminance and resolution while realizing a multi-view in a display panel having a horizontal stripe pixel arrangement.

A stereoscopic display device according to an embodiment of the present invention,

A display panel having a pixel arrangement structure;

a parallax barrier or lenticular disposed on one surface of the display panel; and

and a driving unit for applying an image signal to the display panel,

The drive unit,

The q (q is an integer greater than or equal to 2) subpixels adjacent to each other in a row direction of n subpixels for realizing n (n is an integer greater than or equal to 4) views of the subpixels constitute one unit row, and are formed in a column direction. Set z pixel groups consisting of the p (p is an integer greater than or equal to 2) unit columns adjacent to

When the horizontal length of the sub-pixel is defined as 3a and the vertical length is defined as a, the average distance of the distance from the center of each pixel to the center of another pixel is 2.3a to 25.6a,

The n image signals reflecting the n viewpoints are transmitted for each pixel group, and the image signals of the same viewpoint are transmitted to sub-pixels located at the same position in the pixel group.

In this case, the pixel group may be set to have an adjacent pixel group shifted by one column to the right and p rows to the upper side, or shifted by one column to the left and p rows to the lower side for an arbitrary pixel group.

In this case, the pixel group may be set to have an adjacent pixel group shifted by one column to the left and p rows to the upper side, or shifted by one column to the right and p rows to the lower side for an arbitrary pixel group.

In this case, it is preferable that the horizontal length of the pixel group is longer than the vertical length.

In this case, the ratio of the horizontal and vertical lengths of the pixel group is preferably 6:2 to 75:2.

In this case, the parallax barrier includes a plurality of light transmitting units and a plurality of light blocking units respectively corresponding to the plurality of sub-pixels,

When m is a value obtained by subtracting 1 from q, which is a value obtained by dividing n by p, which is a divisor of n, one sub-pixel corresponding to the light-transmitting part and m sub-pixels corresponding to the light-blocking part are repeatedly arranged in the row direction It is preferable to be formed so as to be possible.

In addition, the light-transmitting part is formed along a diagonal direction of the display panel,

It is preferable that the inclination of the light transmitting part is 33 to 34 degrees.

In addition, the parallax barrier,

a transparent substrate comprising glass; and

A barrier pattern formed on the transparent substrate

It is preferable to include

Another aspect of the present invention is a method for transmitting an image signal in a display panel having a pixel arrangement structure,

The q (q is an integer greater than or equal to 2) subpixels adjacent to each other in a row direction of n subpixels for realizing n (n is an integer greater than or equal to 4) views of the subpixels form one unit row, and are aligned in the column direction. Set z pixel groups consisting of the adjacent p (p is an integer greater than or equal to 2) unit columns,

When the horizontal length of the sub-pixel is defined as 3a and the vertical length is defined as a, the average distance of the distance from the center of each pixel to the center of another pixel is 2.3a to 25.6a,

A method of transmitting an image signal of a stereoscopic display device in which n image signals reflecting n viewpoints are transmitted for each pixel group, and image signals of the same viewpoint are transmitted to sub-pixels located at the same position in the pixel group.

In a three-dimensional display device according to an embodiment of the present invention, the display panel having a horizontal stripe pixel arrangement is driven so as to increase the ratio of the light transmitting part in the parallax barrier while realizing the same n multi-views, so that luminance and The resolution can be improved.

In addition, the adjacent distance between the pixels in the pixel group is relatively long, so that light bleed can be prevented.

In addition, according to the image signal transmission method of a stereoscopic display device according to another embodiment of the present invention, even if the display of the conventional vertical strip pixel array is changed to the horizontal strip pixel array by horizontal conversion, the image signal processing according to the present invention This makes it possible to implement a three-dimensional shape.

1 is a schematic cross-sectional view of a stereoscopic display device according to an exemplary embodiment.
2 is a schematic cross-sectional view of a stereoscopic display device according to a modified example of the present invention.
3 is a plan view illustrating a pixel arrangement of a display panel according to an embodiment of the present invention.
4 is a plan view illustrating a pixel group in a display panel according to an embodiment of the present invention.
5 is a view for explaining a distance between pixels within a pixel group in a display panel according to an embodiment of the present invention.
6 is a diagram illustrating image signal processing in a display panel according to an embodiment of the present invention.
7 is a diagram illustrating image signal processing in a display panel according to an embodiment of the present invention.

Hereinafter, a parallax barrier and a stereoscopic display device including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a stereoscopic display device according to an exemplary embodiment, and FIG. 2 is a schematic cross-sectional view of a stereoscopic display device according to a modified example of the present invention.

Referring to FIG. 1 , the stereoscopic display device 10 according to the present embodiment includes a display panel 100 in which a plurality of sub-pixels 9 and reference numeral 210 in FIG. 3 (the same hereinafter) are defined to implement a multi-view, and a display panel ( It may include a driver 300 for controlling the driving of the 100 , and a parallax barrier 20 disposed on one surface (more precisely, a front surface) of the display panel 100 .

For example, as the display panel 100 , a liquid crystal display (LCD), a plasma display panel (PDP), a display panel using a light emitting diode (LED), or the like may be used. However, the present invention is not limited thereto, and it goes without saying that various types of display panel 100 may be used.

A plurality of sub-pixels 210 are defined in each of a row direction and a column direction in the display panel 100 , and in the present embodiment, the display panel 100 implements a multi-view image. Hereinafter, for convenience, the number of views of the display panel 100 is referred to as n. Here, n is an integer of 2 or more.

The driving unit 300 is for processing an image signal transmitted to the display panel 100 , and provides a multi-view image signal to the display panel 100 to implement a multi-view stereoscopic image. In the present embodiment, the driving unit 300 controls to implement a multi-view image in the pixel group 210 which is an aggregate of sub-pixels defined by a plurality of columns and a plurality of rows. For this, refer to FIGS. 3 and 4 later. to be described in more detail.

The parallax barrier 20 or the lenticular positioned in front of the display panel 100 selectively transmits multi-view images to form a parallax barrier so that both eyes of an observer can see different images.

For example, the parallax barrier 20 includes a plurality of light transmitting units 110 and a plurality of light blocking units 120 respectively corresponding to the sub-pixels 210 of the display panel 100 .

More specifically, as shown in FIG. 1 , the parallax barrier 20 may include a transparent substrate 130 and a barrier pattern 125 formed on the transparent substrate 130 .

Here, the barrier pattern 125 may be formed by applying and drying ultraviolet ink or thermosetting ink and then patterning, but the present invention is not limited thereto. A portion on which the barrier pattern 125 is formed constitutes the light blocking portion 120 , and a portion on which the barrier pattern 125 is not formed constitutes the light transmitting portion 110 . The planar arrangement of the light blocking unit 120 and the light transmitting unit 110 will be described in more detail later with reference to FIGS. 3 and 4 .

The transparent substrate 130 may be, for example, a glass substrate. When a glass substrate is used as the transparent substrate 130 , it has high transmittance and does not need to use a separate substrate. Accordingly, the image implemented in the display panel 100 can be transmitted with high transmittance without problems such as distortion.

As described above, in this embodiment, the transparent substrate 130 is formed of a glass substrate to have high transmittance without image distortion. However, the present invention is not limited to the material of the transparent substrate 130 , and various materials may be used as the transparent substrate 130 .

The parallax barrier 20 is attached and fixed to the front surface of the display panel 100 by the adhesive layer 140 . Various materials may be used as the adhesive layer 140 , and for example, materials such as an ultraviolet adhesive, a visible light adhesive, an infrared adhesive, and a thermal adhesive may be used.

The adhesive layer 140 preferably has a refractive index similar to that of the transparent substrate 130 to minimize moire and prevent the occurrence of a Newton ring. For example, when the transparent substrate 130 is made of a glass substrate, the adhesive layer 140 may have a refractive index of about 1.48 to 1.54 similar to that of the glass substrate.

In the above description, it has been exemplified that the parallax barrier 20 includes the transparent substrate 130 and the barrier pattern 125 formed on the transparent substrate 130 . However, the present invention is not limited thereto.

3 is a plan view illustrating a pixel arrangement of a display panel according to an embodiment of the present invention.

Accordingly, in the present embodiment, a plurality of sub-pixels 210 are arranged in the display panel 100 .

In the present embodiment, the display panel has a pixel array structure in which red (R), green (G), and blue (B) sub-pixels are alternated for each row, and the sub-pixels are in the form of a horizontal stripe. That is, it has a vertical view pixel arrangement, not a horizontal view pixel arrangement of a generally used vertical stripe.

At this time, FIG. 3 is a pixel arrangement diagram of a display panel showing a horizontal strip pixel arrangement in which R, G, and B form the same row. In this case, the order of R, G, and B may be changed.

The driving unit transmits an image signal to the display panel. The driving unit defines a plurality of sub-pixels as a pixel group in order to determine a pixel group, which is a basic unit of a Yeongsan signal, in order to implement a multi-view in the display panel.

4 is an embodiment of a pixel group defined by a driving unit. According to this, the pixel group PG is defined on the display panel by the driver, and the driver is q (q is an integer) adjacent in the row direction composed of n sub-pixels for realizing n (n is an integer greater than or equal to 4) views. An integer greater than or equal to 2) subpixels form one unit row, and a pixel group is defined that includes p (p is an integer greater than or equal to 2) adjacent unit columns in the column direction. For these pixel groups, z (z is an integer) pixel group is defined according to the size and resolution of the display panel.

More specifically, the pixel group includes q subpixels adjacent in the row direction to form one unit row, and p unit rows adjacent to the column direction. In this case, n views are implemented by p * q subpixels. Here, n is an integer of 2 or more, and p and q are divisors of n, and the product of p and q becomes n. More precisely, n views are implemented using subpixels 210 positioned by a plurality of rows and a plurality of columns.

For example, in FIG. 4 , ten views are implemented using two unit rows including five subpixels adjacent to each other in the row direction. That is, if two unit rows composed of five subpixels adjacent in the row direction are used, a total of 10 subpixels are provided, thereby realizing 10 viewpoints. Here, q becomes 5 and p becomes 2. In the drawings, as an example, it has been shown that the number of viewpoints is 10, but the present invention is not limited thereto. Accordingly, it goes without saying that the present invention may have various values of n, p, and q.

However, since the display panel has a pixel arrangement in which subpixels of red (R), green (G), and blue (B) are alternated for each row, horizontal lines may occur when n is a multiple of 3. For example, when 9 views are implemented with subpixels of 3 columns and 3 rows, horizontal lines may occur. In consideration of this, in the present invention, it is preferable that n is a multiple of 2, and that n, p, and q are not all multiples of 3.

In the conventional horizontal viewing arrangement of vertical strips, the vertical length is longer than the horizontal length, and the shape of the pixel group is not widely spread, so the distance between the pixels in the pixel group is short, so there is a problem in that the image of the pixel is crushed.

Therefore, when the average distance between pixels in a pixel group is defined as the average of the distances from the center of each pixel to the center of another pixel, and the horizontal length of a pixel is 3a and the vertical length is a, the distance between pixels in a pixel group is defined as It is desirable to set the pixel group with an average distance of 2.3a to 25.6a (please indicate the number of preferable p and q that can be used as the upper limit).

5 is an explanatory diagram illustrating an average distance within a pixel group having 10 viewpoints. According to this, the closest inter-pixel distance is C1, and the furthest inter-pixel distance is Cn.

In addition, Table 1 shows the average distance between pixels of sub-pixels in the present embodiments for each time point implemented when p is 2 when summing and averaging the distances between all pixels in each sub-pixel in a pixel group.

n 4 6 8 10 12 14 16 18 average distance 2.39a 3.45a 4.48a 5.49a 6.50a 7.50a 8.50a 9.51a n 20 22 24 26 28 30 32 34 average distance 10.51a 11.51a 12.51a 13.51a 14.51a 15.51a 16.51a 17.51a n 36 38 40 42 44 46 48 50 average distance 18.51a 29.51a 20.51a 21.51a 22.51a 23.51a 24.51a 25.51a

In this case, it is preferable that the horizontal length of the pixel group is longer than the vertical length. In particular, when p is 2, w*q :l*p, which is the ratio of the width to the length of one pixel group, is 6:2 to 75:2.

Meanwhile, FIG. 6 describes an arrangement of a plurality of pixel groups defined on a display panel. At this time, as shown in FIG. 6 , the pixel groups are set so that for an arbitrary pixel group, adjacent pixel groups are shifted by one column to the right and p rows upward, or shifted by one column to the left and shifted by p rows downward.

The driver transmits a signal for each defined pixel group, and transmits a signal for each sub-pixel in the pixel group, and the sub-pixels located at the same position in the pixel group receive the image signal of the same view point.

That is, taking the case of 10 views as an example, the first, 3, 5, 7, and 9 image signals from right to left in the unit row P1 located below among the first and second unit rows constituting 10 sub-pixels. is transmitted, and when the second, 4, 6, 8, and 10 images are located from right to left in the unit row P2 located above, the pixels located in the same unit row and unit column of each pixel group have the same view point. ) of the video signal.

7 is an embodiment of pixel groups defined according to another embodiment. According to this, the pixel groups are set so that for any pixel group, adjacent pixel groups are shifted by one column to the left and p rows upward, or shifted by one column to the right and shifted by p rows downward.

On the other hand, in the case of adopting the panelex barrier for implementing 3D in the display panel, one subpixel corresponding to the light transmitting unit 110 and m subpixels corresponding to the light blocking unit 120 are repeatedly arranged when viewed in the row direction. Here, m is a number obtained by subtracting 1 from q. As such, when n views are implemented with q columns and p rows, the ratio of the light transmitting unit 110 to the light blocking unit 120 is 1: m (that is, 1: (q-1)), so the light blocking unit 120 It is possible to reduce the ratio of , and increase the ratio of the light-transmitting unit 110 . As described above, by increasing the ratio of the light-transmitting unit 110 , there is an advantage in that luminance and resolution can be increased.

In this embodiment, the light-transmitting part 110 is formed along the diagonal direction of the display panel 100, so that a multi-viewpoint image can be smoothly expressed. In this case, as described above, since the phallox barrier 20 of the present embodiment has excellent transmittance and refractive index characteristics, it is possible to effectively prevent the moire phenomenon from occurring.

In this case, as described above, a multi-view is implemented in subpixels located in p rows and q columns. When the width w of the sub-pixel along the row direction is A and the length l of the sub-pixel along the column direction is B, the inclination C of the light-transmitting unit 110 is theoretically according to Equation 1 below. .

<Equation 1>

C = (p*B)/A

Considering that there may be an error in reality, the slope C of the light-transmitting unit 110 is according to Equation 2 below.

<Equation 2>

0.95 * {(p*B)/A} ≤ C ≤ 1.05 * {(p*B/A)}

Considering the length (l) and width (w) of the commercially available sub-pixel, the inclination of the light transmitting unit 110 may be 33 to 34 degrees.

The features, structures, effects, etc. as described above are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

Claims (9)

A display panel having a pixel arrangement structure;
a parallax barrier or lenticular disposed on one surface of the display panel; and
and a driving unit for applying an image signal to the display panel,
The drive unit,
The q (q is an integer greater than or equal to 2) subpixels adjacent to each other in a row direction of n subpixels for realizing n (n is an integer greater than or equal to 4) views of the subpixels constitute one unit row, and are formed in a column direction. Set z pixel groups consisting of the p (p is an integer greater than or equal to 2) unit columns adjacent to
When the horizontal length of the sub-pixel is defined as 3a and the vertical length is a, the average distance of the distance from the center of each pixel to the center of another pixel is 2.3a to 25.6a,
A stereoscopic display device for transmitting n image signals reflecting n viewpoints for each pixel group, and transmitting image signals of the same viewpoint to sub-pixels located at the same position in the pixel group. According to claim 1,
wherein the pixel group is set to have an adjacent pixel group shifted by one column to the right and p rows upwards, or shifted by one column to the left and p rows downward for an arbitrary pixel group. According to claim 1,
wherein the pixel group is set to have an adjacent pixel group shifted by one column to the left and p rows to the upper side, or shifted by one column to the right and p rows to the lower side with respect to an arbitrary pixel group. According to claim 1,
The pixel group is a stereoscopic display device in which a horizontal length is longer than a vertical length. 5. The method of claim 4,
The ratio of the horizontal and vertical lengths of the pixel group is 6:2 to 75:2 . 6. The method of claim 5,
The parallax barrier includes a plurality of light transmitting units and a plurality of light blocking units respectively corresponding to the plurality of sub-pixels,
When m is a value obtained by subtracting 1 from q, which is a value obtained by dividing n by p, which is a divisor of n, one sub-pixel corresponding to the light-transmitting part and m sub-pixels corresponding to the light-blocking part are repeatedly arranged in the row direction A three-dimensional display device that is formed so as to be possible. 7. The method of claim 6,
The light transmitting part is formed along a diagonal direction of the display panel,
A stereoscopic display device having an inclination of the light transmitting portion of 33 to 34 degrees. 8. The method of claim 7,
The parallax barrier is
a transparent substrate comprising glass; and
A barrier pattern formed on the transparent substrate
A stereoscopic display device comprising a. A method for transmitting an image signal in a display panel having a pixel arrangement structure,
The q (q is an integer greater than or equal to 2) subpixels adjacent to each other in a row direction of n subpixels for realizing n (n is an integer greater than or equal to 4) views of the subpixels form one unit row, and Set z pixel groups consisting of the adjacent p (p is an integer greater than or equal to 2) unit columns,
When the horizontal length of the sub-pixel is defined as 3a and the vertical length is a, the average distance of the distance from the center of each pixel to the center of another pixel is 2.3a to 25.6a,
A method of transmitting an image signal of a stereoscopic display device for transmitting n image signals reflecting n viewpoints for each pixel group, and transmitting image signals of the same viewpoint to sub-pixels located at the same position in the pixel group.

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