KR100824539B1 - Display device for stereoscopic 3d display and touch panel - Google Patents

Abstract

A stereoscopic three-dimensional display device with a touch panel function is provided to display the three-dimensional image when applying the vertical electric field to upper and lower substrates and to implement a resistor layer type touch panel by using a barrier panel itself. An image panel emits the predetermined image. A barrier panel is located at the upper portion of the image panel and displays the predetermined image as two or three dimensional image. The barrier panel includes a lower substrate(74) having the plural first electrodes arrayed toward the first direction and the plural second electrodes arrayed vertically to the first electrodes. An upper substrate(78) has a transparent common electrode to the corresponding surface of the lower substrate. A liquid crystal layer(72) is filled between the upper and lower substrates. When the vertical electric field is applied by the electric potential between the first electrode and the transparent common electrode, the liquid crystal is driven so that the light beam of the image panel is intercepted.

Description

Display device for stereoscopic 3D display and touch panel

1 is a view showing that a three-dimensional image is implemented by a conventional barrier type 3D display device.

2 is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of an embodiment of the image panel shown in FIG. 2. FIG.

4 is a perspective view of the barrier panel shown in FIG.

<Explanation of symbols for main parts of the drawings>

70 barrier panel 72 liquid crystal layer

74: lower substrate (third substrate) 76: first electrode

77: second electrode 78: upper substrate (fourth substrate)

80: transparent common electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus, and in particular, to a touch panel combined stereoscopic image display apparatus displaying two-dimensional (2D: 2D) and three-dimensional (3D: 3D) images by a user's selection while performing a touch panel operation. It is about.

In general, the three-dimensional image representing the three-dimensional is achieved by the principle of stereo vision through two eyes, the parallax of two eyes, that is, binocular disparity that appears because the two eyes are about 65mm apart is the most important of the three-dimensional It can be called a factor. In other words, each of the left and right eyes sees different two-dimensional images, and when these two images are transmitted to the brain through the retina, the brain accurately fuses each other to reproduce the depth and reality of the original three-dimensional image.

Currently, technologies for displaying three-dimensional stereoscopic images include stereoscopic image display by special glasses, autostereoscopic stereoscopic display, and holographic display. The three-dimensional image display method using the special glasses is the polarization glasses method using the vibration direction or the rotation direction of the polarization, the time-division glasses method alternately presenting while switching the left and right images and the method of delivering light of different brightness in the left and right. Phosphorus concentration difference can be divided. In addition, the autostereoscopic three-dimensional display method has a parallax method and a semi-cylindrical lens arranged in front of each image corresponding to the left and right eyes through a longitudinal grid-shaped aperture to separate and observe the images. It can be divided into a lenticular method using a lenticular plate and an integral photography method using a lens plate shaped like a fly's eye.

In addition, the holographic display method can obtain a three-dimensional stereoscopic image having all factors such as focus adjustment, confinement angle, binocular disparity, and motion parallax that cause three-dimensional effect. With a laser light reproduction hologram and a white light reproduction hologram, Are classified.

The three-dimensional image display method by the special glasses, but many people can enjoy the three-dimensional image, but has the disadvantage of wearing a separate polarized glasses or liquid crystal shutter glasses. That is, the observer must wear special glasses, causing discomfort and unnaturalness.

The autostereoscopic 3D display method has a fixed viewing range and is limited to a small number of people, but there is a feature that does not wear a separate eyeglasses, and thus tends to be preferred. That is, many studies have been conducted in the autostereoscopic 3D display method because the observer directly observes the screen and the above-mentioned disadvantages disappear.

For example, a holographic display method is used to display a perfect 3D stereoscopic image, which is a 3D coordinate image directly displayed in space through a laser, a lens, and a mirror. You can get the feel of it, but it's not easy because it has the disadvantage of technical difficulties and the space that equipment takes up.

Thus, there is an increasing tendency to adopt a parallax barrier, which is a method of realizing a three-dimensional image virtually through deception using stereo images.

The parallax barrier is a vertical or horizontal shape (slit) placed in front of an image corresponding to the left and right eyes so as to separate and observe a stereoscopic image synthesized through the slit to feel a three-dimensional effect. .

Here, the three-dimensional image display apparatus by the parallax barrier method will be described briefly as follows.

1 is a view showing that a three-dimensional image is implemented by a conventional barrier-type 3D display device.

Referring to FIG. 1, in the conventional parallax barrier method, a barrier panel formed by repeatedly arranging a slit through which light emitted from an image panel passes and a barrier that blocks the light is provided in front of the image panel 30. Is placed.

Accordingly, the observer 10 sees the image displayed or printed on the image panel 30 through the slit of the barrier panel 20. The left eye and the right eye of the observer 10 have the same slits, respectively. You will see another area. The parallax barrier method uses this principle, so that the left eye and the right eye view images corresponding to pixels in different areas through the slit, so that a 3D feeling can be felt.

That is, in FIG. 1, the left eye L views the left eye corresponding pixel Lp on the image panel 30, and the right eye R views the right eye corresponding pixel Rp on the image panel 30.

However, in the conventional parallax barrier type 3D display device, since the barrier panel is installed in front of the image panel and the barrier panel is provided, the normal 2D image cannot be viewed. There is a problem that needs to be eliminated.

The present invention provides a barrier panel provided in a 2D / 3D display device, wherein a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction perpendicular to the first direction are formed on a lower plate. The upper panel is formed with a transparent electrode on the front surface, and when a vertical electric field is applied to the upper panel and the lower panel, a 3D image is displayed, and the barrier panel itself is a touch panel combined stereoscopic image display apparatus in which a resistive touch panel is realized. The purpose is to provide.

A display device according to an embodiment of the present invention, the image panel for emitting a predetermined image; A barrier panel positioned above the image panel to display the predetermined image as a 2D (2D) image or a 3D (3D) image,

The barrier panel includes: a lower substrate having a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction perpendicular to the first direction; An upper substrate having a transparent common electrode formed on a front surface corresponding to the lower substrate; Characterized in that it comprises a liquid crystal layer filled between the upper substrate and the lower substrate.

In addition, when a vertical electric field is applied by a potential difference between the first electrode of the lower substrate and the transparent common electrode of the upper substrate, the liquid crystal positioned on the first electrode is driven to serve as a barrier to block light of the image panel. It features.

The image panel may be a liquid crystal panel, and a backlight may be further provided below the liquid crystal panel.

The liquid crystal panel may further include: a first substrate having a plurality of gate wirings and data wirings intersecting each other, and a pixel including a thin film transistor and a pixel electrode formed at each crossing portion; A black matrix formed in a region corresponding to a portion other than the pixel electrode of the first substrate, a color filter formed in a region corresponding to the pixel electrode, and a common electrode formed in front of the black matrix and the color filter; 2 substrates; A liquid crystal layer filled between the first substrate and the second substrate is included.

In addition, the width of the second electrode is less than the width of the first electrode and is arranged in a region overlapping with the black matrix forming region of the liquid crystal panel, and in particular, the gate wiring forming region of the black matrix forming region of the liquid crystal panel. It is characterized in that arranged in the area overlapping with.

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

2 is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

As shown in FIG. 2, the display device according to the present invention includes an image panel 60 and a barrier panel 70.

The image panel 200 may be implemented as a liquid crystal display (LCD), a plasma display (PDP), an organic light emitting display (OLED), or the like. Explain.

Referring to FIG. 2, the display device according to an exemplary embodiment of the present invention includes a liquid crystal panel 60 displaying a flat image by using the backlight 50 and light emitted therefrom, and a barrier on the liquid crystal panel. The panel has a configuration in which it is located.

At this time, the liquid crystal panel 60 is a pair of first and second substrates 64, which are bonded to each other with the first liquid crystal layer 62 interposed therebetween, similarly to a general active matrix type liquid crystal panel. 66, and although not clearly shown in the drawings, a plurality of pixels are arranged horizontally between these substrates 64,66.

Each pixel includes a transparent pixel electrode of the first substrate 64 and a transparent first common electrode of the second substrate 66 that face each other with a liquid crystal interposed therebetween. An image signal voltage is selectively applied by a thin film transistor (TFT). The second substrate 66 includes, for example, an RGB color filter (Red, Green, Blue color-filter) and a black matrix filling the gap therebetween corresponding to each pixel. The common electrode covers them.

Therefore, when the image signal voltage is applied to the pixel electrode of the pixel selected by the switching operation of the thin film transistor, a voltage difference is generated between the pixel electrode and the first common electrode. As a result, liquid crystal molecules having optical anisotropy and polarization are driven to transmit the transmittance. As the light of the backlight 50 passes through the liquid crystal panel 60, various planar color images are displayed according to the difference in transmittance for each pixel and the sum of hue of the RGB color filter.

In addition, the barrier panel 70 includes third and fourth substrates 74 and 78 bonded to each other with the second liquid crystal layer 72 interposed therebetween, but unlike the main liquid crystal panel 60 described above, The first electrode 76 as a transparent stripe electrode in the form of a simple stripe is formed on the inner surface of the third substrate 74, and the transparent second common electrode 80 is provided on the inner surface of the fourth substrate 78. At this time, the liquid crystal driving voltage is applied to the barrier electrode 76 only in the 3D mode under the premise that the second liquid crystal layer 72 is a twisted nematic aggregate.

However, in the exemplary embodiment of the present invention, not only the transparent barrier electrode arranged in a stripe shape with respect to the first direction on the third substrate 74, that is, the first electrode 76 but also a second perpendicular to the first direction. The second electrode (not shown) arranged in a plurality in the direction is characterized in that it is further formed.

That is, the electrode formed on the third substrate 74 is implemented in a matrix form by the first electrode (barrier electrode) 76 and the second electrodes, which acts as the touch panel as the barrier panel 70. To do this. Operation of the barrier panel as a touch panel will be described later in more detail with reference to the accompanying drawings.

In addition, such a display device includes, for example, an outer surface of the first substrate 64 of the liquid crystal panel 60, between the liquid crystal panel 60 and the barrier panel 70, and a fourth substrate 74 of the barrier panel 70. The first to third polarizing plates 82, 84 and 86 are respectively attached to the rear surface.

Accordingly, the display device having the above-described configuration has a normal white color over the entire surface of the barrier panel 70 in the 2D mode of FIG. 2A in which no voltage is applied to the first electrode and the second electrode 76 of the barrier panel 70. By maintaining the normal white state, the light emitted from the backlight 50 is simply transmitted, and as a result, the observer can see the planar image of the liquid crystal panel 60.

On the other hand, in the 3D mode of FIG. 2B in which the liquid crystal driving voltage is applied to the first electrode 76, only the liquid crystal between the barrier electrode 76 and the second common electrode 80 is driven to display the black portion. Barrier-zone (hereinafter referred to as B-zone (B)) to block the portion between the transparent area (transparent zone, white hereinafter simply referred to as T-zone) It is called T).

As a result, the B-zone (B) and the T-zone (T) act as a barrier and a slit, respectively, so that an observer can recognize an image of the liquid crystal panel 60 in three dimensions, and the barrier panel 80, strictly The 2D and 3D modes can be switched by the on / off operation of the barrier electrode, that is, the first electrode 76.

In more detail for the 3D image realization method implemented by such a display device, first, the light toward the observer's left eye passes through the slit of the barrier panel through the left eye pixel L of the liquid crystal panel 60. Becomes the light reaching the left eye of the. However, among the light passing through the left eye pixel L of the liquid crystal panel 60, the light directed to the viewer's right eye is blocked by the barrier and is not transmitted to the viewer.

In this way, there is light reaching the observer's right eye through the slit of the barrier panel through the observer's right eye pixel R, while the observer's right eye pixel R passes through the right eye pixel R. Light directed to the left eye is blocked by the barrier.

As a result, the light passing through the left eye pixel L becomes the light transmitted only to the left eye of the observer, and the light passing through the right eye pixel R becomes the light transmitted only to the right eye of the observer so that the viewer can recognize it. Will be. At this time, sufficient parallax information is formed between the light reaching the left eye and the light reaching the right eye so that the observer, human, can fully sense, thereby allowing the observer to enjoy three-dimensional images. It will be possible.

FIG. 3 is an exploded perspective view of an embodiment of the image panel shown in FIG. 2.

However, the image panel provided in the display device according to the embodiment of the present invention may be implemented as a liquid crystal display (LCD), a plasma display device (PDP), an organic light emitting display device (OLED), etc. as described above. In the embodiment of the present invention, a liquid crystal display, that is, a liquid crystal panel having a backlight, will be described as an example.

Referring to FIG. 3, the liquid crystal panel according to the present invention includes first and second substrates 110 and 140 bonded to each other with the first liquid crystal layer 130 interposed therebetween.

The first substrate 110 is also commonly referred to as a lower substrate or an array substrate, and a plurality of gate wirings 114 and data wirings 116 intersect the matrix on the inner surface of the transparent first substrate 110 such as glass. The pixel P having the shape is repeatedly defined vertically and horizontally, and the thin film transistor 120 is provided at the intersection of the gate line 114 and the data line 116 so that the transparent pixel electrode 122 mounted on each pixel P is provided. ) And one-to-one correspondence.

The second substrate 140 facing the same is generally referred to as an upper substrate or a color filter substrate, and the gate and data wirings 114 and 116 of the first substrate 110 are formed on the inner surface of the transparent second substrate 140 such as glass. In addition, the black matrix 146 defining the openings which are repeated in a lattice shape so as to expose only the pixel electrodes 122 by covering portions not directly related to the liquid crystal driving such as the thin film transistor 120 and the like, filled in the openings. As an example, R, G, and B color filters 144a, 144b, and 144c, and transparent first common electrodes 148 covering them are provided. In this case, although not clearly shown in the drawings, an alignment layer for determining the alignment direction of the liquid crystal molecules is interposed on the inner surfaces of the first and second substrates 110 and 140 in contact with the first liquid crystal layer 130.

Accordingly, the liquid crystal panel 100 having the above-described structure exhibits a difference in transmittance by controlling the arrangement direction of liquid crystal molecules by a vertical electric field generated by an artificial voltage difference between the pixel electrode 122 and the first common electrode 148. The light emitted from the backlight 300 of FIG. 5 reflects the difference in transmittance of each pixel P and the color combination of the R, G, and B color filters 144a, 144b, and 144c. Display the planar image.

4 is a perspective view of the barrier panel shown in FIG. 2.

Referring to FIG. 4, the barrier panel 70 includes a plurality of first electrodes 76 arranged in a first direction on a lower substrate (third substrate) 74 in a second direction perpendicular to the first direction. A plurality of second electrodes 77 are formed, and a transparent electrode 80 is formed on the upper substrate (fourth substrate) 78 so that a 3D image may be displayed when a vertical electric field is applied to the upper and lower substrates. In addition, the barrier panel itself may be a resistive touch panel.

That is, the barrier panel 70 includes third and fourth substrates 74 and 78 bonded to each other with the second liquid crystal layer 72 interposed therebetween, and has a simple stripe shape on the third substrate. The transparent barrier electrode, that is, the first electrode 76 is formed, and the transparent second common electrode 80 is formed on the fourth substrate 78.

In this case, a liquid crystal driving voltage is applied to the first electrode 76 only in the 3D mode under the premise that the second liquid crystal layer 72 is a twisted nematic assembly. When a voltage is applied between the transparent second common electrode 80 and the vertical electric field to form a vertical electric field, as described above, only a liquid crystal positioned on the first electrode 76 is driven to block the black region. In other words, it serves as a barrier.

As a result, the barrier panel 80 may switch between 2D and 3D modes by the on / off operation of the first electrode 76. The barrier panel 80 may be positioned between the image panel and the observer to pass or block light. In the case of displaying a 2D image, the image is transmitted through the image panel as it is, and in the case of displaying the 3D image, light from the right eye pixel R and the left eye pixel L of the image panel is displayed. Through the slits that pass through and the barrier that blocks, the viewer can realize a virtual 3D stereoscopic image.

However, in the exemplary embodiment of the present invention, not only the transparent barrier electrode arranged in a stripe shape with respect to the first direction on the third substrate 74, that is, the first electrode 76 but also a second perpendicular to the first direction. The second electrode 77 is arranged in a plurality in the direction is characterized in that it is further formed.

That is, the electrode formed on the third substrate 74 is implemented in a matrix form by the first electrode (barrier electrode) 76 and the second electrode 77, which acts as a barrier panel. To do this.

In general, the touch panel may be implemented in a resistive film type, a capacitive type, an ultrasonic type, a light sensor type, or an electromagnetic induction type. The touch panel according to an embodiment of the present invention may be implemented in a resistive film type.

The resistive film is widely used as an input device such as an electronic organizer, PDA, portable PC, etc. in combination with LCD (Liquid Crystal Display), and the design is more advantageous than other methods in thin, small size, light weight and low power consumption. Are matrix and analog.

Film substrate, glass substrate, plastic substrate, etc. are used as a transparent electrode material, and the combination is composed of upper and lower electrodes, and according to the wiring of the potential compensation electrode, the analog detection method is divided into 4 wire type, 5 wire type, and 8 wire type. .

Referring to FIG. 4, the barrier panel 70 includes an upper substrate (fourth substrate) 78 on which the second common electrode 80 is formed on the front surface, and first and second electrodes 76 and 77 having a matrix form. The lower substrate (third substrate) 74 and the liquid crystal layer 72 formed between the third and fourth substrates 74 and 78 to form a signal distribution on the X and Y coordinates using the two substrates. The touch panel may be implemented by operating through a contactor and transmitting the data to an external integrated circuit (IC).

In this case, a potential compensation electrode (not shown) may be further formed on both sides of the second common electrode 80 as an example of a specific region on the second common electrode 80 formed on the fourth substrate 78. have.

Through such a configuration, when the barrier panel 70 applies an electric potential to the fourth substrate 78 to detect the X-axis coordinate, the electric potential is distributed on the entire surface of the second common electrode 80. When the upper and lower plates (third and fourth substrates) 74 and 78 come into contact with each other by applying pressure to the front surface of the fourth substrate 78, that is, the screen, the first and the first dislocations are arranged in the matrix shape. The second electrode 76, 77 is induced on the third substrate 74, and the X-axis coordinate is calculated using this signal. Thus, while the upper and lower substrates (third and fourth substrates) are in contact with each other, the third substrate ( A potential for detecting Y-axis coordinates is also applied to 74) so that the potential is distributed over the entire surface of the transparent metal, and the Y-axis potential at the point where the finger or the pen touches is induced on the fourth substrate 78, and this signal is By calculating the Y-axis coordinates using, the X- and Y-axis values calculated above are displayed on the display. And perform, but that it is done through the touch panel acts.

That is, the barrier panel 70 has the first electrode 76 arranged in a stripe shape when a vertical electric field is applied between the upper and lower plates, thereby acting as a barrier for realizing a 3D stereoscopic image. The lower substrate (third substrate) 74 has a matrix-type electrode structure by the second electrodes 77 arranged in a plurality of vertical directions with one electrode 76. As a result, the barrier panel itself is a resistive film type. Characterized in that the touch panel is implemented.

In this case, however, the second electrode 77 should be formed in a region overlapping the black matrix region, that is, corresponding to the black matrix formation region of the liquid crystal panel described above, and the width of the second electrode is the first electrode. It is characterized in that it is formed less than the width of (76).

In addition, the second electrode 77 may not correspond to 1: 1 in the black matrix forming region of the liquid crystal panel. For example, it is assumed that the black matrix is formed in the region corresponding to the gate wiring of the liquid crystal panel. The second electrode 77 includes the first gate wiring, the fourth gate wiring, the seventh gate wiring. It may be formed so as to overlap the black matrix formation region corresponding to the 3n-2 gate wiring (n is an integer).

According to the present invention, in the barrier panel for implementing a stereoscopic image, a first electrode arranged in a plurality of first directions in the lower plate and a second electrode arranged in a second direction perpendicular to the first direction is formed on the lower plate and The upper plate is formed with a transparent electrode on the front surface, and when a vertical electric field is applied to the upper plate and the lower plate, a 3D image is displayed. In addition, the resistive touch panel is implemented by the barrier panel itself, thereby enabling various applications. It is an advantage.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present 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.

Claims (7)

An image panel for emitting a predetermined image; A barrier panel positioned above the image panel to display the predetermined image as a 2D (2D) image or a 3D (3D) image, The barrier panel, A lower substrate having a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction perpendicular to the first direction; An upper substrate having a transparent common electrode formed on a front surface corresponding to the lower substrate; Touch panel combined stereoscopic image display device comprising a liquid crystal layer filled between the upper substrate and the lower substrate. The method of claim 1, When a vertical electric field is applied by the potential difference between the first electrode of the lower substrate and the transparent common electrode of the upper substrate, the liquid crystal positioned on the first electrode is driven to serve as a barrier to block light of the image panel. Touch panel combined stereoscopic image display device. The method of claim 1, And the image panel is a liquid crystal panel, and a backlight is further provided under the liquid crystal panel. The method of claim 3, wherein The liquid crystal panel, A first substrate on which a plurality of gate lines and data lines cross each other, and a pixel including a thin film transistor and a pixel electrode formed at each of the crossing portions; A black matrix formed in a region corresponding to a portion other than the pixel electrode of the first substrate, a color filter formed in a region corresponding to the pixel electrode, and a common electrode formed in front of the black matrix and the color filter; 2 substrates; Touch panel combined stereoscopic image display device characterized in that it comprises a liquid crystal layer filled between the first substrate and the second substrate. The method of claim 1, And a width of the second electrode is smaller than that of the first electrode. The method of claim 4, wherein And the second electrode is arranged in a region overlapping with a black matrix forming region of the liquid crystal panel. The method of claim 6, And the second electrode is arranged in a region overlapping with the gate wiring forming region of the black matrix forming region of the liquid crystal panel.

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