KR102039361B1 - Stereoscopic image display device - Google Patents

Abstract

A stereoscopic image display device capable of reducing a rear distance includes a display panel configured to display a plurality of images; And a view generator disposed on the display panel to generate a plurality of views corresponding to each of the plurality of images. The horizontal length of each view is larger than the binocular spacing of a person.

Description

Stereoscopic Image Display Device {STEREOSCOPIC IMAGE DISPLAY DEVICE}

The present invention relates to a stereoscopic image display device, and more particularly, to a stereoscopic image display device capable of reducing a rear distance.

A stereoscopic (or 3D) image display device is a device that enables a viewer to view stereoscopic images by binocular parallax between the left and right eyes by providing different images to the left and right eyes of the viewer.

In recent years, research has been actively conducted on the glasses-free method without wearing stereoscopic glasses. The autostereoscopic method includes a lenticular method for separating left and right eye images using a cylindrical lens array and a barrier method for separating left and right eye images using a barrier.

FIG. 1 is a view schematically illustrating a general barrier type stereoscopic image display device.

Referring to FIG. 1, a general barrier type stereoscopic image display device includes a display panel 110 that separates and displays a left eye image L and a right eye image R, and is disposed on the front of the display panel 110 to transmit light. And a barrier panel 120 alternately forming the region 122 and the blocking region 124.

The viewer 140 views an image displayed on the display panel 110 through the light transmission region 122 of the barrier panel 120. The left and right eyes of the viewer 140 view the same light transmission region 122. Through this, another area of the display panel 110 is viewed. Accordingly, the viewer 130 views the left eye image L and the right eye image R, which are displayed adjacent to each other through the light transmission region 122, so that the viewer may feel a three-dimensional effect.

FIG. 2 is a diagram schematically illustrating a general lenticular stereoscopic image display device. FIG.

Referring to FIG. 2, a general lenticular stereoscopic image display device is disposed in front of a display panel 110 and a display panel 110 that separate and display a left eye image L and a right eye image R. It is configured to include a lenticular lens array 130 including a lens.

The viewer 140 views an image displayed on the display panel 110 through the lenticular lens array 130. The left and right eyes of the viewer 140 view another area of the display panel 110 through the lenticular lens. do.

Specifically, the lenticular lens array 130 refracts the left eye image L provided from the display panel 110 to provide the left eye of the viewer 140, and refracts the right eye image R to the right eye of the viewer 140. By providing to the viewer 140 to be able to watch a three-dimensional image.

In the above-described barrier type and lenticular lens type stereoscopic image display apparatuses, the display panel 110 and the barrier panel 120 or the lenticular are provided to separate the left eye image L and the right eye image R to the viewer 140. Back distance S over a predetermined distance between the lens array 130 should be secured.

 In this case, since the thickness and weight of the product may increase according to the back distance S, it is necessary to minimize the back distance S.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and a technical object of the present invention is to provide a stereoscopic image display device capable of minimizing a rear distance between the display panel and the barrier panel 120 or the lenticular lens array 130.

In addition to the technical task of the present invention mentioned above, other features and advantages of the present invention will be described below, or from such description and description will be clearly understood by those skilled in the art. In addition, other features and advantages of the present invention may be newly understood through the embodiments of the present invention.

According to an aspect of the present invention, a stereoscopic image display apparatus includes: a display panel configured to display a plurality of images; And a view generator disposed on the display panel to generate a plurality of views corresponding to each of the plurality of images. The horizontal length of the plurality of views is greater than the binocular spacing of a person.

보다 작고, 상기 b는 상기 표시 패널과 상기 뷰생성부 간의 이격거리를 나타내고, 상기 E는 양안간격을 나타내고, 상기 P_s는 상기 서브 픽셀의 크기를 나타내는 것을 특징으로 한다.According to another aspect of the present invention, there is provided a stereoscopic image display apparatus comprising: a display panel in which a plurality of subpixels are formed and displaying a plurality of images on the plurality of subpixels; And a view generator that includes a lenticular lens and is disposed on the display panel to generate a plurality of views corresponding to each of the plurality of images. Focal length of the lenticular lens

Smaller than b, wherein b represents a separation distance between the display panel and the view generation unit, E represents a binocular spacing, and P _s represents the size of the sub-pixel.

According to the present invention, the rear surface distance between the display panel and the barrier panel 120 or the lenticular lens array 130 can be minimized by forming the horizontal length of the view larger than the binocular spacing.

In addition, the present invention has another effect of reducing the thickness and weight of the product in accordance with the reduction of the rear distance.

In addition, the present invention further reduces the rear distance between the display panel and the barrier panel or the lenticular lens array and simultaneously adjusts the view arrangement on the display panel so that the viewer can watch a stereoscopic image at the same viewing distance as before.

1 is a diagram schematically illustrating a general barrier type stereoscopic image display device.
FIG. 2 is a diagram schematically illustrating a stereoscopic image display apparatus of a general lenticular lens type.
3 is a diagram schematically illustrating a conventional stereoscopic image display device.
4 is a view for explaining a view arrangement disposed on a conventional display panel.
5 is a diagram schematically illustrating a 3D image display device according to an exemplary embodiment.
6 is a diagram for describing a plurality of image arrays disposed on a display panel according to an exemplary embodiment.
7 is a diagram for explaining an arrangement of a lenticular lens.
8 is a view for explaining an example in which the pitch of the lenticular lens is changed.

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

Hereinafter, for convenience of description, a stereoscopic image display device according to an embodiment of the present invention will be described using a lenticular lens method. However, the present invention is not limited to the lenticular lens type stereoscopic image display device, but may be applied to all the stereoscopic image display devices of the auto glasses type as well as the barrier type stereoscopic image display device.

3 is a diagram schematically illustrating a conventional stereoscopic image display device, and FIG. 4 is a diagram for describing a view arrangement disposed on a conventional display panel.

Referring to FIG. 3, the conventional stereoscopic image display device includes a display panel 210, a gap forming unit 220, and a view generator 230.

In the display panel 210, a plurality of pixels respectively displaying a plurality of images are sequentially and repeatedly arranged.

The gap forming unit 220 is disposed between the display panel 210 and the view generator 230 to maintain a separation distance between the display panel 210 and the view generator 230. The gap forming part 220 may be made of a transparent glass material so that image light incident from the display panel 210 may pass.

The view generator 230 generates a plurality of views corresponding to the plurality of images and is disposed on the display panel 210 at a predetermined distance. At this time, the rear clearance distance (S ₁₎ referred to, and a rear distance between the view generation unit 230 and the display panel (210) (S ₁₎ is supported by the gap-forming portion (220).

In addition, the view generator 230 includes a plurality of lenses 232, and generates a plurality of views while passing the plurality of images provided from the display panel 210 through the plurality of lenses 232.

In this case, one lens 232 may be disposed to correspond to the plurality of images displayed on the display panel 210. For example, as illustrated in FIG. 4, when four images 1, 2, 3, and 4 are sequentially displayed on the display panel 210, one lens 232 may display the display panel 210. Are arranged to correspond to the four images (1, 2, 3, 4). In this case, the pitch P of the lens 232 is slightly smaller than the size of four pixels of the display panel 210.

On the other hand, the plurality of views are generally formed such that the horizontal length (VD ₁ ) and the interval VI ₁ between the views are equal to the binocular spacing (E) of the viewer 240, the left and right eyes of the viewer 240 Provide another video.

The present invention aims to reduce the thickness of the stereoscopic image display device by reducing the rear distance S ₁ between the view generator 230 and the display panel 210 described above.

Accordingly, the stereoscopic image display device according to the present invention proposes to reduce the rear distance by using at least one of the curvature radius of the lens, the pitch of the lens, and the view arrangement.

Hereinafter, a stereoscopic image display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 5 to 9.

5 is a diagram schematically illustrating a stereoscopic image display device according to an exemplary embodiment.

Referring to FIG. 5, a stereoscopic image display device according to an exemplary embodiment of the present invention includes a display panel 310, a gap forming part 320, and a view generating part 330.

First, the display panel 310 separates and displays a plurality of images. The display panel 210 may be a direct type or a projection type liquid crystal display (LCD), an organic light emitting diode display (OLED), a field emission display (FED), A flat panel display such as a plasma display panel (PDP) or an electroluminescent display (EL) may be used.

The display panel 310 includes a plurality of pixels in which regions are divided by gate lines and data lines that cross each other.

The pixels constituting the display panel 310 are arranged in a matrix form forming a row and a column, and each pixel includes red, green, and blue subpixels for displaying colors.

A thin film transistor having a gate electrode, an active layer, a source electrode, and a drain electrode is disposed in an intersection region of the gate line and the data line. Each pixel is filled with a liquid crystal material that is equivalent to the liquid crystal cell, and a storage capacitor is formed to maintain a constant voltage charged in the liquid crystal cell.

The display panel 310 displays an image on each pixel according to a scan signal sequentially supplied to the gate line and an image signal supplied through the data line.

When the scan signal is supplied from the gate line, the thin film transistor provided in each pixel is turned on to charge the liquid crystal cell with the image signal received through the data line. The image signal charged in the liquid crystal cell of each pixel is held by the storage capacitor for one frame period.

Meanwhile, the display panel 310 displays a plurality of images to correspond to one pixel or to correspond to only one subpixel R, G, and B of one pixel. An arrangement of a plurality of images displayed on the display panel 310 according to an exemplary embodiment of the present invention will be described later with reference to FIGS. 6 and 7.

Next, the gap forming unit 320 is formed between the display panel 310 and the view generating unit 330 to maintain the back distance S ₂ between the display panel 310 and the view generating unit 330. The gap forming part 320 is formed of a transparent glass material so that image light provided from the display panel 310 can pass.

Meanwhile, the thickness of the gap forming part 320 is determined by the focal length of the view generating part 330. Accordingly, if the focal length of the view generator 330 can be reduced, the thickness of the gap forming unit 320 can also be reduced, thereby reducing the overall thickness of the stereoscopic image display device. . In addition, since the gap forming part 320 is generally formed of glass, the weight reduction effect is also great as the thickness is reduced.

Next, the view generator 330 is disposed on the display panel 210 to generate a plurality of views corresponding to the plurality of images displayed on the display panel 310. The view generator 330 may be implemented as one of a parallax barrier, a lenticular lens array, and a liquid crystal field lens array.

Hereinafter, it will be described on the assumption that the view generator 330 is implemented as a lenticular lens array.

The view generator 330 includes a plurality of lenticular lenses 332. The view generator 330 according to an embodiment of the present invention increases the magnification of the lenticular lens 332 by forming a curvature radius of the lenticular lens 332 smaller than that of the conventional lenticular lens 232. This can reduce the focal length.

This fact can be seen through Equation 1 below.

Here, a denotes an appropriate viewing distance, b denotes a distance between the lenticular lens 332 and the display panel 310, and f denotes a focal length of the lenticular lens 332.

The magnification is determined by the equation (2).

Here, m represents the magnification. If Equation 1 and Equation 2 are arranged, Equation 3 can be obtained.

That is, it can be seen from Equation 3 that the focal length of the lenticular lens 332 is inversely proportional to the magnification m.

Meanwhile, in the stereoscopic image display apparatus, the magnification m is (horizontal length of the view) / (subpixel size), and the general stereoscopic image display apparatus is designed to form the horizontal length of the view by binocular spacing, so that the lenticular lens 332 is used. The focal length of can be summarized by Equation 4.

Here, E denotes binocular spacing, and P _s denotes the size of the subpixel.

The stereoscopic image display device according to the present invention is characterized in that the lenticular lens 332 is designed to have a focal length satisfying Equation 5 below.

The stereoscopic image display device according to the present invention is designed so that the horizontal length of the view is larger than the binocular spacing. Accordingly, the stereoscopic image display device according to the exemplary embodiment designs the magnification of the lenticular lens 332 to be larger than the E / P _{s in} order to reduce the focal length of the lenticular lens 332.

By reducing the focal length of the lenticular lens 332 as described above, the stereoscopic image display device according to an embodiment of the present invention reduces the rear distance (S ₂ ) between the display panel 310 and the view generator 330. You can.

In general, the stereoscopic image display device provides the viewer 340 with an image displayed on the display panel 310 by allowing the focus of the lenticular lens 332 to be formed on the display panel 310. Accordingly, the back distance S ₂ between the display panel 310 and the view generator 330 may be the same as the focal length of the lenticular lens 332.

However, as described above, if only the focal length of the lenticular lens 332 and the back distance S ₂ between the display panel 310 and the view generator 330 are reduced, the plurality of lenses generated by the view generator 330 may be reduced. The view of has a problem that the horizontal length (VD ₂ ) and the distance (VI ₂ ) between the views increases to become larger than the binocular spacing (E).

When the view interval VI ₂ is larger than the binocular spacing E as described above, the image is not properly provided to at least one of the left eye and the right eye of the viewer 340, so that the viewer 340 cannot watch the stereoscopic image.

Accordingly, it is necessary to correct the image arrangement displayed on the display panel 310.

FIG. 6 is a diagram for describing a plurality of image arrays disposed on a display panel according to an exemplary embodiment. FIG. 7 is a diagram for describing an arrangement of a lenticular lens.

6 and 7 assume that the rear distance between the display panel and the view generator is reduced by half in the stereoscopic image display device illustrated in FIG. 4. That is, the back distance S ₂ shown in FIG. 6 corresponds to 1/2 of the back distance S ₁ shown in FIG. 4.

As described above, when the back distance is reduced to 1/2, the view interval is twice as large as that of FIG. 4, that is, 2E.

In the present invention, as shown in FIG. 4, the plurality of images are not sequentially arranged in order to have the binocular spacing E as shown in FIG. 4. Referring to FIG. 6, it is assumed that the display panel 310 displays four images in units of subpixels.

The display panel 310 repeatedly arranges the first sub-pixel 1 displaying the first image and the third sub-pixel 3 displaying the third image in a row, changing rows, and displaying a second image. The second subpixel 2 and the fourth subpixel 4 displaying the fourth image are repeatedly arranged in a row. In this case, the display panel 310 allows the second subpixel 2 to be disposed in an oblique direction of the first subpixel 1.

As illustrated in FIG. 7, the lenticular lens 332 disposed on the display panel 310 has a pitch P ₂ corresponding to four subpixels, and the subpixels of the subpixel of the display panel 310 are disposed. It extends in the diagonal direction.

On the other hand, the view generator 330 generates the first to fourth views corresponding to the first to fourth images (1, 2, 3, and 4) displayed on the display panel 310 at horizontal positions. , The view interval VI ₂ is the binocular spacing E, and the horizontal length VD ₂ of the view is twice the distance of the binocular spacing E.

Referring to FIG. 5 again, as illustrated in FIGS. 6 and 7, the plurality of images are arranged diagonally in two or more rows without sequentially arranging a plurality of images on the display panel 310, and the lenticular lens 332 is disposed. By extending in the diagonal direction of the sub-pixels, the plurality of views can be formed at the same interval VI ₂ as the binocular spacing E. FIG.

However, the horizontal length VD ₂ of the plurality of views is still larger than the binocular spacing E. Accordingly, the plurality of views are characterized by overlapping at least some of the adjacent views.

In the above-described exemplary embodiment, the back distance S ₂ of the stereoscopic image display device is reduced by increasing the radius of curvature of the lenticular lens 332. In addition, the stereoscopic image display device may further reduce the rear distance S ₂ by reducing the pitch P of the lenticular lens 332.

The back distance S may be expressed as in Equation 6.

Here, S denotes the rear distance, P denotes the pitch of the lenticular lens 332, D denotes an appropriate viewing distance, and VD denotes the horizontal length of the view.

In the above Equation 4, if the proper viewing distance D is a fixed value, the rear distance S may be determined by the pitch P of the lenticular lens 332 and the horizontal length VD of the view.

In the above-described embodiment, the rear distance S decreases as the horizontal length VD of the view increases. Referring again to the specific example, it is assumed that the 3D image display device according to the exemplary embodiment increases the radius of curvature of the lenticular lens 332 to double the magnification.

When the magnification is doubled, the focal length of the lenticular lens 332 is 1/2, and thus the horizontal length VD of the view is doubled. In this case, the back distance S may be 1/2 as the horizontal length VD of the view is doubled when using Equation 6.

In another exemplary embodiment, the rear distance S may be reduced by changing the pitch P of the lenticular lens 332 as well as the horizontal length VD of the view.

8 is a cross-sectional view for explaining an example in which the pitch of the lenticular lens is changed.

Referring to FIG. 8, it is assumed that the display panel 310 displays four images in units of subpixels.

The display panel 310 repeatedly arranges the first sub-pixel 1 displaying the first image and the third sub-pixel 3 displaying the third image in a row, changing rows, and displaying a second image. The second subpixel 2 and the fourth subpixel 4 displaying the fourth image are repeatedly arranged in a row. In this case, the display panel 310 allows the second subpixel 2 to be disposed in an oblique direction of the first subpixel 1.

The lenticular lens 332 disposed on the display panel 310 extends in the diagonal direction of the subpixel of the display panel 310.

On the other hand, the view generator 330 generates the first to fourth views corresponding to the first to fourth images (1, 2, 3, and 4) displayed on the display panel 310 at horizontal positions. , The view interval VI becomes the binocular spacing E, and the horizontal length VD of the view is twice the distance of the binocular spacing E.

On the other hand, the lenticular lens 332 included in the view generator 330 has a pitch P ₃ corresponding to two sub-pixels, unlike FIG. 6. That is, the pitch P ₃ of the lenticular lens 332 illustrated in FIG. 8 corresponds to 1/2 of the pitch of the lenticular lens 332 illustrated in FIG. 6.

According to Equation 6, it can be seen that the back distance S ₃ shown in FIG. 8 is 1/2 of the back distance S ₂ shown in FIG. 6. In addition, it can be seen that 1/4 of the rear distance (S ₁ ) shown in FIG.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

210 and 310: display panel 220 and 320: gap forming unit
230, 330: view generating unit S: rear distance
P: Pitch of lenticular lens VD: Horizontal length of view
VI: View Interval D: Proper Viewing Distance

Claims (12)

delete delete delete delete delete delete A display panel on which a plurality of sub pixels are formed and which displays a plurality of images on the plurality of sub pixels;
A view generator including a lenticular lens and disposed on the display panel to generate a plurality of views corresponding to each of the plurality of images; And
A gap forming part formed between the display panel and the view generating part;
The focal length of the lenticular lens satisfies Equation 1 below.
(Equation 1)

(In Equation 1, f is the focal length of the lenticular lens, b is the separation distance between the display panel and the view generator, m is the magnification of the lenticular lens)
The magnification of the lenticular lens corresponds to the ratio of the size of the subpixel to the horizontal length of the view,
The horizontal length of each view is greater than the binocular spacing,
By the horizontal length of the view larger than the binocular spacing, the magnification of the lenticular lens is larger than the ratio of the size of the subpixel to the binocular spacing, the focal length of the lenticular lens is reduced as shown in Equation 2 below,
(Equation 2)

(Equation 2, f is the focal length of the lenticular lens, b is the separation distance between the display panel and the view generator, E is binocular spacing, P _s is the size of the sub-pixel)
According to Equation 1, the separation distance between the display panel and the view generator by the gap forming part is reduced in correspondence to the reduced focal length of the lenticular lens.
The first subpixel displaying the first image and the third subpixel displaying the third image of the plurality of subpixels are repeatedly arranged in a column direction in the first column, and the second subpixel displaying the second image and the second subpixel displaying the second image are arranged. The fourth subpixel displaying the 4 image is repeatedly arranged in the column direction in a second column adjacent to the first column,
The second subpixel is disposed in an oblique direction of the first subpixel,
The lenticular lens is formed extending in the diagonal direction,
The long-axis edge of any one of the lenticular lens is disposed in an oblique direction corresponding to two subpixels arranged adjacent to each other in a row direction among the first to fourth subpixels. delete The method of claim 7, wherein
And each of the views overlaps at least a portion of the adjacent views. delete The method of claim 7, wherein
And reducing the radius of curvature of the lenticular lens or the pitch of the lenticular lens so that the magnification of the lenticular lens is increased. The method of claim 11,
And a magnification of the lenticular lens is doubled.

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