KR101843180B1 - Stereoscopic Image Display Device - Google Patents

Abstract

An embodiment of the present invention is a liquid crystal display device comprising: a liquid crystal panel displaying an image; A retarder film attached to the display surface of the liquid crystal panel and separating the left eye image and the right eye image per frame; And spectacles in which the polarization characteristics of the left eye glasses and the right eye glasses are changed by the first voltage and the second voltage alternately supplied for each frame so as to enjoy an image emitted through the retarder film.

Description

[0001] The present invention relates to a stereoscopic image display device,

An embodiment of the present invention relates to a stereoscopic image display device.

The stereoscopic image display device is divided into a stereoscopic technique and an autostereoscopic technique.

The binocular parallax method uses the parallax images of the left and right eyes with large stereoscopic effects. In the binocular parallax system, there are a glasses system and a non-glasses system, and both systems are now practically used. In the spectacle method, the polarizing direction of the right and left parallax images is changed in a time-division manner to a direct-view liquid crystal panel or a projector, and a stereoscopic image is implemented using polarizing glasses or liquid crystal shutter glasses. In the non-eyeglass system, an optical plate such as a parallax barrier for separating the optical axis of left and right parallax images is installed in front of or behind the liquid crystal panel.

In recent years, patterned retarders, which are optical films that change optical modulation characteristics by patterns, have been increasingly applied to stereoscopic image display devices due to commercialization of stereoscopic image display devices and development of various technologies.

Conventional pattern drifters have a spatial division structure (in which black stripes exist corresponding to pixels) since the polarization characteristics are fixed in terms of characteristics. Therefore, when the conventional patterned retarder is used, there is a problem that the resolution of the stereoscopic image display device is reduced to half in a monocular view due to a change in the spatially defined polarization, and the improvement is required.

An embodiment of the present invention for solving the above-described problems of the background art provides a stereoscopic image display device capable of realizing full HD without degrading resolution in 3D implementation, and also capable of preventing crosstalk and improving crosstalk .

According to an embodiment of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel displaying an image; A retarder film attached to the display surface of the liquid crystal panel and separating the left eye image and the right eye image per frame; And spectacles in which the polarization characteristics of the left eye glasses and the right eye glasses are changed by the first voltage and the second voltage alternately supplied for each frame so as to enjoy an image emitted through the retarder film.

In the glasses, the left eye glasses and the right eye glasses can alternately transmit the left eye image and the right eye image.

In the glasses, the polarization characteristics of the left eyeglasses and the right eyeglasses can be changed in synchronization with the liquid crystal panel.

The spectacles include a first left eye electrode and a first right eye electrode located on a plane on which an image is incident; A second left eye electrode and a second right eye electrode positioned opposite to the first left eye electrode and the first right eye electrode; An eyeglass liquid crystal layer positioned between the first left eye electrode and the first right eye electrode, between the second left eye electrode and the second right eye electrode, respectively; And a lambda / 4 plate attached to the second left eye electrode and the second right eye electrode, respectively.

The spectacles may include sub-electrodes formed between the first left eye electrode and the first right eye electrode, and between the second left eye electrode and the second right eye electrode, respectively, so as to apply an electric field to the eyeglass liquid crystal layer.

The sub-electrodes may alternately be formed in the direction of the first left eye electrode and the first right eye electrode and the direction of the second left eye electrode and the second right eye electrode.

The sub-electrodes can serve as a black matrix.

The sub-electrodes may have a shape protruding from the base so that an electric field is applied to the spectacle liquid crystal layer located between them.

The spectacle liquid crystal layer may be formed of an isotropic medium.

The retarder film comprises a first film, a second film to be adhered to the first film, black matrices located between the first film and the second film and divided in the horizontal direction of the liquid crystal panel, A retarder liquid crystal layer formed between the second films, and a lambda / 4 plate attached to the second film.

The embodiment of the present invention has an effect of providing a stereoscopic image display device capable of realizing Full HD without lowering the resolution in 3D implementation, and also capable of preventing luminance reduction and improving crosstalk.

1 is a schematic view of a stereoscopic image display apparatus according to an embodiment of the present invention;
Fig. 2 is an exemplary circuit configuration of a subpixel. Fig.
3 is a schematic configuration diagram of an image panel according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating an operation state of each eyeglass frame according to an embodiment of the present invention. FIG.
5 is a schematic configuration diagram of glasses according to an embodiment of the present invention;
Fig. 6 is an operational state view of each eyeglass frame shown in Fig. 5; Fig.
FIG. 7 is a view showing the operation state of each of the image panel and the eyeglass frame by frame. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a stereoscopic image display apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a circuit configuration of a subpixel. Referring to FIG.

1 and 2, a stereoscopic image display device according to an exemplary embodiment of the present invention includes an image supply unit SBD, a timing control unit TCN, a driving unit DRV, a liquid crystal panel (LCD), a retarder film (PRF) and glasses (GLS).

The image supply unit (SBD) generates 2D image frame data in a two-dimensional mode (2D mode) and 3D image frame data in a three-dimensional mode (3D mode). The image supply unit SBD supplies the timing control unit TCN with timing signals and video frame data such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock do.

The image supply unit SBD is selected in a 2D or 3D mode according to a user selection input through the user interface, generates image frame data corresponding thereto, and supplies the image frame data to the timing control unit TCN. The user interface includes user input means such as an OSD (On Screen Display), a remote controller, a keyboard, and a mouse. Hereinafter, an example will be described in which the image supply unit (SBD) is selected as the 3D mode and supplies the 3D image frame data to the timing control unit (TCN).

The timing control unit TCN receives 3D image frame data including left eye image frame data and right eye image frame data from the image supply unit SBD. The timing controller TCN alternately supplies the left eye image frame data and the right eye image frame data to the driver DRV at a frame frequency of 120 Hz or more. In addition, the timing control unit TCN supplies a control signal corresponding to the image frame data to the driving unit DRV.

The driving unit DRV includes a data driver connected to the data lines to supply a data signal, and a gate driver connected to the gate lines and supplying a gate signal. The driving unit DRV converts the digital left-eye and right-eye image frame data into analog left-eye and right-eye image frame data under the control of the timing control unit TCN and supplies them to the data lines. The driving unit DRV sequentially supplies the gate signals to the gate lines under the control of the timing control unit TCN.

A liquid crystal panel (LCD) receives a gate signal and a data signal from a driver DRV, and displays a two-dimensional image or a three-dimensional image corresponding thereto. A liquid crystal panel (LCD) includes a thin film transistor substrate (hereinafter referred to as a TFT substrate) on which a thin film transistor (TFT) and a capacitor are formed, and a color filter substrate on which a color filter and a black matrix are formed. In the liquid crystal panel (LCD), subpixels (SP) including a liquid crystal layer formed between the TFT substrate and the color filter substrate are formed in a matrix form.

The subpixel SP includes a red subpixel, a green subpixel, and a blue subpixel. A typical circuit configuration of one subpixel includes a thin film transistor (TFT), a storage capacitor Cst, and a liquid crystal layer Clc as shown in FIG. In a thin film transistor (TFT), a source electrode is connected to a data line DL to which a data signal is supplied, and a gate electrode is connected to a gate line GL to which a gate signal is supplied. The storage capacitor Cst and the liquid crystal layer Clc are connected to the drain electrode of the thin film transistor TFT and are supplied with a common voltage supplied through the common voltage line Vcom. With this configuration, the liquid crystal layer Clc is driven by the difference between the data voltage supplied to the pixel electrode 1 and the common voltage supplied to the common electrode 2. The common electrode is formed on a color filter substrate in a vertical electric field driving method such as a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode, and is formed on the color filter substrate in a horizontal (horizontal) mode such as IPS (In Plane Switching) mode and FFS And is formed on the TFT substrate together with the pixel electrode 1 in the electric field driving system.

The liquid crystal mode of the liquid crystal panel (LCD) can be implemented in any liquid crystal mode as well as the TN mode, the VA mode, the IPS mode, and the FFS mode. The lower polarizer plate POL1 and the upper polarizer plate POL2 are attached to the TFT substrate of the liquid crystal panel (LCD) and the color filter substrate, respectively. The liquid crystal panel (LCD) thus configured is capable of displaying an image by the light provided from the backlight unit (BLU).

The backlight unit BLU is driven under the control of the image supply unit SBD or the timing control unit TCN to provide light to the liquid crystal panel LCD. The backlight unit BLU includes a light source for emitting light, a light guide plate for guiding the light emitted from the light source toward the liquid crystal panel (LCD), an optical member for diffusing and condensing the light emitted from the light guide plate, and the like.

The backlight unit (BLU) is composed of an edge type, a dual type, a quad type, and a direct type. In the edge type, a light source is arranged on one side of a liquid crystal panel (LCD), a dual type is a light source is arranged on both sides of a liquid crystal panel (LCD), and a quad type is a light source is arranged on all sides of a liquid crystal panel And the direct type is a type in which a light source is disposed below a liquid crystal panel (LCD).

The retarder film (PRF) displays the left eye image and the right eye image displayed on the liquid crystal panel (LCD) in a line-by-line manner and interlaced. To this end, the retarder film PRF separates the image displayed on the liquid crystal panel (LCD) by polarizing odd-numbered lines to right circularly polarized light (R) and even-numbered lines to left circularly polarized light (L) (or vice versa).

Glasses (GLS) are used to separate the left and right eye images from the retarder film (PRF). The glasses GLS are supplied with the first voltage and the second voltage alternately supplied to the frames by the eyeglass controller CON so that the polarization characteristics of the left eye glasses LEFT and the right eye glasses RIGHT are alternately changed As a result, the left eye glasses (LEFT) and the right eye glasses (RIGHT) of the glasses (GLS) alternately transmit the left eye image and the right eye image.

The eyeglasses GLS are synchronized with the liquid crystal panel LCD by the eyeglass controller CON driven under the control of the image supply unit SBD or the timing control unit TCN to change the polarization characteristics of the left eye glasses LEFT and the right eye glasses RIGHT Change. The eyeglass controller CON can be driven to change the polarization characteristics of the glasses GLS in synchronization with the scan time of the backlight unit BLU. Therefore, the liquid crystal response (LC Response) of the glasses GLS and the liquid crystal panel (LCD) can be synchronized in units of block frames (when the backlight units are driven block by block).

According to the above structure, when the left eye image and the right eye image are alternately displayed on the liquid crystal panel (LCD) by frame, the retarder film PRF separates the left eye image and the right eye image and emits them separately. GLS) to enjoy 3D high-density 3D images.

In the above description, the backlight unit (BLU), the liquid crystal panel (LCD), and the retarder film (PRF) are integrated devices for displaying images, so they are defined as an image panel (PNL) in the description of the present invention.

Hereinafter, a stereoscopic image display device according to an embodiment of the present invention will be described in more detail.

FIG. 3 is a schematic configuration diagram of an image panel according to an embodiment of the present invention, and FIG. 4 is an operation state diagram of glasses according to an embodiment of the present invention.

3, a liquid crystal panel (LCD) for displaying an image and a retarder film (PRF) for separating a left eye image and a right eye image are attached to the display surface of a liquid crystal panel (LCD) ). In the drawing, the backlight unit is omitted.

The retarder film PRF includes a first film FL1, a second film FL2, black matrices BM, a retarder liquid crystal layer PLC and a? / 4 plate PQWP. The first film FL1 and the second film FL2 are cemented together. The black matrices BM are located between the first film FL1 and the second film FL2 and are divided in the horizontal direction of the liquid crystal panel LCD so as to be positioned in the boundary region between the subpixels SP. A retarder liquid crystal layer (PLC) is formed between the first film FL1 and the second film FL2. The? / 4 plate (PQWP) is attached to one surface of the second film (FL2) from which an image incident through the liquid crystal panel (LCD) is emitted.

With this configuration, the retarder film PRF separates the image displayed on the liquid crystal panel LCD by polarizing the odd line to right circularly polarized light R and the even line to left circularly polarized light L (or vice versa).

As shown in FIG. 4, the glasses GLS alternate with an odd frame and an even frame, and the polarization directions of the left eye glasses LEFT and the right eye glasses RIGHT are changed. For example, if it is assumed that the left eyeglass lens LEFT operates to generate the left circularly polarized light L during the odd frame and the right eyeglass RIGHT operates to cause the right circularly polarized light R, (LEFT) causes the right circularly polarized light (R) and the right eye glass (RIGHT) causes the left circularly polarized light (L).

That is, in the glasses (GLS) according to the present invention, the polarizations of the left and right eyes are changed in frame units, and at the same time, the left and right eye images of the image panel are changed, thereby realizing full HD. Also, since the glasses (GLS) operates as described above, the stereoscopic image display apparatus according to the present invention can reduce the luminance reduction in the 3D implementation and improve the crosstalk.

Hereinafter, the configuration and operation of the spectacles of the stereoscopic image display apparatus according to one embodiment of the present invention will be described in more detail.

FIG. 5 is a schematic configuration diagram of spectacles according to an embodiment of the present invention, and FIG. 6 is an operational state view of frames of the spectacles shown in FIG.

5, the first left eye electrode LE1 and the first right eye electrode RE1, the second left eye electrode LE2 and the second right eye electrode RE2, the eyeglass liquid crystal layer GLC ) / 4 plate (GQWP), and sub electrodes SE1 and SE2.

The first left eye electrode LE1 and the second left eye electrode LE2 constitute the left eye glasses LEFT and the first right eye electrode RE1 and the second right eye electrode RE2 constitute the right eye glasses RIGHT, They are formed on the film but are not limited thereto.

The first left eye electrode LE1 and the first right eye electrode RE1 are located on the plane IN on which the image is incident and the second left eye electrode LE2 and the second right eye electrode RE2 are located on the first left eye electrode LE1, And is positioned opposite to the first right eye electrode RE1. The first left eye electrode LE1, the first right eye electrode RE1, the second left eye electrode LE2, and the second right eye electrode RE2 may be formed of transparent electrodes, but are not limited thereto.

The eyeglass liquid crystal layer GLC is located between the first left eye electrode LE1 and the first right eye electrode RE1 and between the second left eye electrode LE2 and the second right eye electrode RE2. The spectacle lens liquid crystal layer GLC is formed of an isotropic material having a large electric field optical effect. When the liquid crystal layer GLC is formed of an isotropic material having a large electric field effect, a fast response speed can be obtained while lowering the driving voltage of the glasses GLS.

The? / 4 plate GQWP is attached to the second left eye electrode LE2 and the second right eye electrode RE2 so as to face the eye of the user.

The sub electrodes SE1 and SE2 are formed between the first left eye electrode LE1 and the first right eye electrode RE1 and between the second left eye electrode LE2 and the second right eye electrode RE2. The sub electrodes SE1 and SE2 are alternately formed in the directions of the first left eye electrode LE1 and the first right eye electrode RE1 and the directions of the second left eye electrode LE2 and the second right eye electrode RE2. For example, the first sub-electrodes SE1 are formed in the first left-eye electrode LE1 and the first right-eye electrode RE1, the second sub-electrodes SE2 are formed in the second left-eye electrode LE2, And may be respectively formed on the right eye electrode RE2.

The sub-electrodes SE1 and SE2 are connected to the first left eye electrode LE1, the second left eye electrode LE2, the first right eye electrode RE1, and the first left eye electrode LE2 so that an electric field is separately applied to the glasses liquid crystal layer GLC located therebetween. And a shape protruding from the second right eye electrode RE2. Accordingly, the spectacle liquid crystal layer GLC is divided into sub-electrodes SE1 and SE2 by regions, and the polarization characteristics are changed for each region. Meanwhile, the sub electrodes SE1 and SE2 may be formed as opaque electrodes to serve as a black matrix, but are not limited thereto.

As shown in FIG. 6, the eyeglasses GLS are divided into a left eye glasses LEFT and a right eye glasses RIGHT by a first voltage V> 0 and a second voltage V <0, The polarization characteristic is changed.

For example, if the first voltage (V> 0) and the second voltage (V <0) are applied to the left eye glasses LEFT and the right eye glasses RIGHT during the odd frame, ) And the right eye glasses (RIGHT) cause right circular polarization (R). Alternatively, if the second voltage (V <0) and the first voltage (V> 0) are applied to the left eye glasses (LEFT) and the right eye glasses (RIGHT) during the even frame, the left eye glasses (LEFT) R) and the right eye glasses (RIGHT) cause left circularly polarized light (L).

Therefore, the polarizing characteristics of the left eye glasses (LEFT) and the right eye glasses (RIGHT) are alternately changed by the first voltage (V> 0) and the second voltage (V <0)

FIG. 7 is a diagram showing the operation state of each of the image panel and the eyeglass frame. FIG. 7 is a view for explaining the operation state of each of the image panel and the eyeglass frame, and these reference numerals are omitted. Reference numerals of the image panel (PNL) refer to FIG. 3 and reference numerals of the glasses (GLS) Please refer to Fig.

As shown in FIG. 7, the liquid crystal panel LCD divides a frame into odd frames and even frames and outputs the left eye images L1, R1, and L3 and the right eye images R2, L2, and R4 Is displayed on the sub-pixel SP. The retarder film (PRF) separates the left eye image and the right eye image and emits them.

When the image panel PNL operates as described above, the glasses GLS are arranged such that the first voltage (V > 0) and the second voltage (V < 0) alternate during the odd frame and the even frame .

The first voltage V> 0 and the second voltage V <0 are applied to the left eye glasses LEFT and the right eye glasses RIGHT during the odd frame. At this time, the left eye glasses (LEFT) cause the left eye polarized light (L), so that the left eye image is transmitted and the right eye glasses (RIGHT) cause the right eye polarized light (R).

The second voltage V <0 and the first voltage V> 0 are applied to the left eye glasses LEFT and the right eye glasses RIGHT during the even frame. At this time, the left eye glasses (LEFT) cause the right eye polarized light (R), so that the right eye image is transmitted and the right eye glasses (RIGHT) cause the left eye polarized light (L).

Conventionally, glasses applied to a stereoscopic image display apparatus have been implemented in a 3D mode in which a left eye glasses and a right eye glasses transmit or block a specific image in the concept of ON and OFF. However, The eyeglasses (GLS) transmit the left eye and the right eye glasses separately in a combination of the left eye image and the right eye image or the combination of the right eye image and the left eye image.

That is, the glasses (GLS) applied to the stereoscopic image display apparatus of the embodiment can compensate the loss of the image caused by the spatial division by the retarder film (PRF) through the glasses (GLS) changed by alternating polarizations.

Therefore, the embodiment has an effect of providing a stereoscopic image display device capable of implementing full HD without deteriorating resolution in 3D implementation, and also capable of preventing luminance reduction and improving crosstalk.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

SBD: Image supply unit TCN: Timing control unit
DRV: Driving part LCD: liquid crystal panel
PRF: Retarder Film GLS: Glasses
LE1: first left eye electrode RE1: first right eye electrode
LE2: second left eye electrode RE2: second right eye electrode
GLD: Glasses liquid crystal layer GQWP:? / 4 plate
SE1, SE2: Sub electrodes

Claims (11)

A liquid crystal panel for displaying an image;
A retarder film attached to a display surface of the liquid crystal panel and separating a left eye image and a right eye image for each frame; And
Eyeglasses and the eyeglasses whose polarization characteristics of the left eyeglasses and the right eyeglasses are changed by the first voltage and the second voltage alternately supplied to the frame in synchronism with the liquid crystal panel so as to enjoy an image emitted through the retarder film,
The spectacle,
A first left eye electrode and a first right eye electrode located on a surface on which an image is incident;
A second left eye electrode and a second right eye electrode positioned opposite to the first left eye electrode and the first right eye electrode;
An eyeglass liquid crystal layer positioned between the first left eye electrode and the second left eye electrode and between the first right eye electrode and the second right eye electrode;
First sub electrodes protruding from the first left eye electrode and the first right eye electrode, respectively;
Second sub electrodes protruding from the second left eye electrode and the second right eye electrode, respectively; And
/ 4 plate attached to the second left eye electrode and the second right eye electrode, respectively,
The first and second sub-electrodes alternately protrude from the first left-eye electrode and the second left-eye electrode and protrude from the first right-eye electrode and the second right-
Wherein the first voltage and the second voltage are applied to the first left eye electrode and the second left eye electrode or to the first right eye electrode and the second right eye electrode. The method according to claim 1,
The spectacle,
Wherein the left eye glasses and the right eye glasses alternately transmit the left eye image and the right eye image. delete delete delete delete The method according to claim 1,
The sub-
And a black matrix. delete The method according to claim 1,
Wherein the spectacle lens layer comprises:
Wherein the first electrode is formed of an isotropic medium. The method according to claim 1,
The retarder film may be formed by,
A first film,
A second film bonded to the first film,
A black matrix disposed between the first film and the second film and divided in the horizontal direction of the liquid crystal panel,
A retarder liquid crystal layer formed between the first film and the second film,
And a lambda / 4 plate attached to the second film. The method according to claim 1,
Wherein the first voltage and the second voltage are a positive voltage, a negative voltage, a negative voltage, and a positive voltage, respectively, and the first and second left and right eye electrodes and the first right eye electrode alternately in synchronization with the liquid crystal panel, And the second right eye electrode or the first right eye electrode and the second right eye electrode, and the first left eye electrode and the second left eye electrode to change polarization directions of the left eye glasses and the right eye glasses to be different from each other.

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