KR20120072714A - Active compensation stereoscopic glasses for patterned retarder type 3d image system - Google Patents

Abstract

PURPOSE: Active light view angle compensation stereographic eyeglasses are provided to view 3D images in a superior state even when an audience frequently changes viewing positions.. CONSTITUTION: Stereographic eyeglasses(PG) comprise a left-eye eyeglass(LG) having a first circularly polarizing filter(P1) and a right-eye eyeglass(RG) having a second circularly polarizing filter(P2). The left-eye eyeglass of the stereographic eyeglasses comprises a left side linear polarizing film(LP) having a light transmission axis of 0 degree direction of the rear side of the first circularly polarizing filter. The right-eye eyeglass comprises a right side linear polarizing film(RP) having a light transmission axis of 0 degree direction of the rear side of the second circularly polarizing filter. The left-eye eyeglass transmits a left-eye image which is linearly polarized to the 0 degree direction by the first circularly polarizing filter. The right-eye eyeglass transmits a right-eye image which is linearly polarized to the 0 degree direction by the second circularly polarizing filter.

Description

Active Compensation Stereoscopic Glasses For Patterned Retarder Type 3D Image System}

The present invention relates to a three-dimensional glasses to actively compensate for the change in position of the viewer. In particular, the present invention relates to stereoscopic glasses that actively compensate for position in accordance with a change in the viewing angle of an observer in a patterned retarder type 3D stereoscopic imaging system.

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

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

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

The patterned retarder type 3D image display device uses a film based patterned retarder (FPR) on the outer surface of a flat panel display panel and a patterned retarder (GPR) on a glass substrate. There is a way to implement Glass based Patterned Retarder. Although the patterned retarder type 3D stereoscopic image system solves many disadvantages of other 3D image systems, the quality degradation problem according to the viewing direction of the viewer is not solved like other image systems.

An object of the present invention is designed to overcome the problems of the prior art as described above, to provide a three-dimensional stereoscopic glasses of the patterned retarded method to compensate for the quality degradation caused by changing the viewing position of the viewer. Another object of the present invention is to provide a patterned retarded three-dimensional imaging system having three-dimensional stereoscopic glasses that actively compensate for the wide viewing angle according to the change of the position of the observer.

According to an embodiment of the present invention, an active wide viewing angle compensation stereoscopic glasses for viewing a 3D image includes: a communication unit configured to receive a relative position value with a display panel; A left eyeglass window having a left eye compensation layer, a first circular polarizing filter layer, and a left eye linear polarizing filter layer; A right eye window having a right eye compensation layer, a second circularly polarized filter layer, and a right eye linearly polarized filter layer; And a controller configured to adjust the left eye compensation layer and the right eye compensation layer to the position values received through the communication unit.

The first circular polarization filter layer and the second circular polarization filter layer may include a patterned retarder in a direction orthogonal to each other.

The controller may further include a memory unit configured to store a value for controlling the left eye compensation layer and the right eye compensation layer in advance according to the position value.

The position value may include a front range section of the display panel; And a wide viewing angle range section other than the front range section.

The control unit does not operate the left eye compensation layer and the right eye compensation layer in the front range section; In the wide viewing angle range section, the controller adjusts at least one of the left eye compensation layer and the right eye compensation layer to a preset value.

The wide viewing angle range section is characterized by being divided into at least two or more ranges.

The left eye compensation layer and the right eye compensation layer may include a liquid crystal layer and two electrode layers for driving the liquid crystal layer.

The controller may drive the liquid crystal layer at a preset voltage value according to the position value.

The liquid crystal layer may include at least one of a horizontal electric field driving method and a vertical electric field driving method.

Active wide viewing angle glasses for viewing 3D image according to the present invention has an effect that the compensation function for compensating for the deterioration of the image quality caused by the change of the position of the viewer with respect to the display panel. The compensation function does not work when viewed from the front of the 3D image display device. However, when the viewing position is changed in the lateral direction, the compensation function operates to maintain the image quality observed from the front. Therefore, even if the viewer changes the observation position from time to time, the viewer can always watch the 3D image in the best condition.

1 is a perspective view showing the configuration of a patterned retarder type three-dimensional imaging system according to the present invention.
2 is a view showing the structure of a stereoscopic glasses used in the patterned retarder type three-dimensional imaging system according to the present invention.
3 is a view showing a relative positional relationship with respect to the display panel DP of the stereoscopic glasses in the patterned retarder type three-dimensional imaging system according to the present invention.
FIG. 4 is a diagram illustrating a first embodiment of dividing a compensation section according to a position change of stereoscopic glasses in a patterned retarder type three-dimensional imaging system according to the present invention; FIG.
FIG. 5 is a diagram illustrating a second embodiment of dividing a compensation section according to a position change of stereoscopic glasses in a patterned retarder type three-dimensional imaging system according to the present invention; FIG.
FIG. 6 is a diagram illustrating a third embodiment of dividing a compensation section according to a position change of stereoscopic glasses in a patterned retarder type three-dimensional imaging system according to the present invention; FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention. 1 is a perspective view showing the configuration of a patterned retarder type three-dimensional imaging system according to the present invention. Referring to FIG. 1, the three-dimensional imaging system according to the present invention includes a display panel DP for implementing 2D or 3D images, a film-type patterned retarder FPR attached to a front surface of the display panel DP, And stereoscopic glasses (PG).

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

In the display panel DP, a liquid crystal layer LC is formed between two glass substrates. The display panel DP includes liquid crystal cells arranged in a matrix by a cross structure of data lines and gate lines. A pixel array including data lines, gate lines, a TFT, a pixel electrode, and a storage capacitor is formed on the lower glass substrate SL of the display panel DP. The liquid crystal cells are driven by an electric field between the pixel electrodes connected to the TFT and the common electrode. The black matrix, the color filter, and the common electrode are formed on the upper glass substrate SU of the display panel DP. An alignment layer for setting a pre-tilt angle of the liquid crystal is formed in each of the upper glass substrate SU and the lower glass substrate SL of the display panel DP.

The upper polarizing film PU and the lower polarizing film PL are attached to the outside of the upper glass substrate SU and the lower glass substrate SL of the display panel DP. The common electrode is formed on the upper glass substrate (SU) in the vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode, and is connected to IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. In the same horizontal electric field driving method, a pixel electrode is formed on the lower glass substrate SL. A column spacer for maintaining a cell gap of the liquid crystal cell may be formed between the glass substrates.

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

The patterned retarder PR is attached to the outside of the upper polarizing film PU of the display panel DP. In the patterned retarder PR, unit retarders corresponding to each line having one line of pixels arranged in the horizontal direction of the display panel DP as a basic unit are arranged. For example, one unit retarder is allocated to correspond to an area of pixels commonly connected to one gate line. In particular, the first retarder RT1 is assigned to the odd lines of the patterned retarder PR, and the second retarder RT2 is assigned to the even lines of the patterned retarder PR. do. The light transmission axis of the first retarder RT1 and the light transmission axis of the second retarder RT2 are perpendicular to each other.

The first retarder RT1 circularly polarizes the linearly polarized light in the first direction through the upper polarizing film PU of the display panel DP. The second retarder RT2 circularly polarizes the linearly polarized light in the second direction through the upper polarizing film PU of the display panel DP. For example, the upper polarizing film PU may be a polarizing film having a light transmission axis in the Y-axis direction when the surface of the display panel DP is an X-Y plane. The first retarder RT1 has a light transmission axis in a 135-degree direction on the XY plane, and when a left eye image is emitted from a pixel corresponding to the first retarder RT1, the first retarder RT1 is a left circle image that is linearly polarized in the Y-axis direction. Can be changed to polarized light. The second retarder RT2 has a light transmission axis in a 45 degree direction on the XY plane and emits a right eye image from a pixel corresponding to the second retarder RT2, thereby changing the right eye image linearly polarized in the Y-axis direction into right circularly polarized light. You can.

In addition, the display panel DP further includes a reference point transmitter OR for transmitting a reference position for informing the stereoscopic glasses PG of the relative position of the viewer with respect to the front plane of the display panel DP. For example, the reference point transmitter OR may be installed at the center of the lower center or the center of the upper center of the display panel DP.

The stereoscopic glasses PG include a left eyeglass window LG that selectively transmits only the left eye image, and a right eyeglass window RG that selectively transmits only the right eye image. In addition, the stereoscopic glasses PG further includes a user tracking sensor TS that receives a position of the reference point from the reference point transmitter OR provided in the display panel DP. The user tracking sensor TS is preferably located at a central connection portion of the left eyeglass window LG and the right eyeglass window RG of the stereoscopic glasses PG. The user tracking sensor TS may be configured to detect a relative position of the stereoscopic glasses PG by receiving a signal from the reference point transmitter PR of the display panel DP. The function and configuration of the user tracking sensor TS are well known in the art, and thus detailed descriptions thereof will be omitted.

Referring to FIG. 2, stereoscopic glasses for selectively transmitting a left eye image and a right eye image polarized in different directions on the display panel DP to the left eye and the right eye as described above will be described in detail. 2 is a view showing the structure of the stereoscopic glasses used in the patterned retarder type three-dimensional imaging system according to the present invention.

The stereoscopic glasses PG includes a left eyeglass window LG having a first circular polarizing filter P1 and a right eyeglass window RG having a second circular polarizing filter P2. For example, the first circular polarization filter P1 has the same light transmission axis as the first retarder RT1 of the pattern retarder PR to linearly polarize the left circularly polarized image in the 0 degree direction, while right circularly polarized light. The right eye image is linearly polarized in the 90 degree direction. In addition, the second circular polarizing filter P2 has the same light transmission axis as the second retarder RT2 of the pattern retarder PR to linearly polarize the right circularly polarized right image in the 0 degree direction, while the left circularly polarized left eye The image is linearly polarized in the 90 degree direction.

The left eyeglass window LG of the stereoscopic glasses PG further includes a left linear polarizing film LP having a light transmission axis in the 0 degree direction on the rear surface of the first circular polarizing filter P1. Similarly, the right eyeglass window RG further includes a right linear polarizing film RP having a light transmission axis in the 0 degree direction on the rear surface of the second circular polarizing filter P2. Then, the left eyeglass window LG transmits only the left eye image linearly polarized in the 0 degree direction by the first circular polarization filter P1. In addition, the right eyeglass window RG transmits only the right eye image linearly polarized in the 0 degree direction by the second circular polarization filter P2.

As a result, the left eye image and the right eye image implemented in the display panel DP may be selectively passed through the left and right eyes of the stereoscopic glasses PG, respectively, to view a three-dimensional image due to binocular disparity. When the user views from the front side of the display panel DP, the user may view a normal stereoscopic image. However, when the user changes the position sideways or up or down, the user may view the image in a state where the image quality is lower than the front side. have.

In order to prevent this, the outermost surface of the stereoscopic glasses PG according to the present invention is further provided with a compensation layer. That is, the left eye compensation layer LCL is disposed on the outer surface of the first circular polarization filter P1 of the left eyeglass window LG, and the right eye compensation layer RCL is disposed on the outer surface of the second circular polarization filter P2 of the right eyeglass window RG. Is placed. The left eye compensation layer LCL and the right eye compensation layer RCL may not use the compensation function when the stereoscopic glasses PG are within the front range of the display panel DP. On the other hand, it is desirable to operate the left eye compensation layer LCL and the right eye compensation layer RCL only when it is out of the front range to compensate for the problem of deterioration in image quality caused by the out of view angle.

Referring to FIG. 3, the left eye compensation layer LCL and the right eye compensation layer RCL operate in detail as the stereoscopic glasses PG change relative to the display panel DP. FIG. 3 is a diagram illustrating a relative positional relationship with respect to the display panel DP of the stereoscopic glasses in the patterned retarder type 3D image system according to the present invention.

In FIG. 3, a case where the reference point transmitter OR is provided in the lower center of the display panel DP will be described. The relative position of the stereoscopic glasses PG with respect to the reference point of the display panel DP is displayed using a spherical coordinate system represented by r, θ, and ψ. In particular, the r value, which is the distance between the display panel DP and the stereoscopic glasses PG, is not considered, but only the azimuth coordinate values θ and ψ are considered.

For example, as shown in FIG. 3, the case where the stereoscopic glasses PG is located in the upper right side (point P) with respect to the reference point (the position of the reference point emitter OC) of the display panel DP will be described as an example. do. The value of θ is an angle value with respect to the X axis on the X-Z plane when the spherical coordinate system and the rectangular coordinate system overlap, and the value of ψ is an angle value with respect to the X axis on the X-Y plane.

A method of setting a compensation section on the spatial coordinate system shown in FIG. 3 will now be described. FIG. 4 is a diagram illustrating a first embodiment of dividing a compensation section according to a position change of stereoscopic glasses in a patterned retarder type 3D imaging system according to the present invention. For example, if the values of θ and ψ satisfy a value within the cone range indicated by the dotted line in FIG. 4, it is regarded as a normal range so that the compensation functions of the left eye compensation layer LCL and the right eye compensation layer RCL are not operated. Can be set to remain OFF. On the other hand, when the position of the stereoscopic glasses PG is out of the dotted cone, the compensation function of the left eye compensation layer LCL and the right eye compensation layer RCL may be set to the ON state in consideration of the wide viewing angle range.

To this end, the user tracking sensor TS of the stereoscopic glasses PG according to the present invention periodically receives a signal from the reference point transmitter OR, and further includes a central computing device for calculating the position of the stereoscopic glasses PG. It can be provided. The left eye compensation layer LCL or the right eye compensation layer RCL may further include a memory or a look-up table storing compensation value information depending on the degree of compensation value to be used when the compensation function is used. The controller may further include a controller configured to control the left eye compensation layer LCL or the right eye compensation layer RCL by a compensation value according to the position value calculated by the central computing device.

Hereinafter, a method for controlling the left eye compensation layer LCL or the right eye compensation layer RCL in the stereoscopic glasses PG having such a configuration will be described in detail. The left eye compensation layer LCL or the right eye compensation layer RCL is most preferably implemented using liquid crystals. For example, when the compensation function of the left eye compensation layer LCL or the right eye compensation layer RCL is not used, the function of the compensation layer may be maintained in the OFF state by maintaining the initial state without driving the liquid crystal layer. . On the other hand, when the compensation function of the compensation layer is to be used, the liquid crystal layer is driven by applying a voltage corresponding to the compensation value to the liquid crystal layer, thereby providing a compensation value to the left eyeglass window LG and the right eyeglass window RG.

For example, the dotted cone range shown in FIG. 4 may be set to a value satisfying both the θ value of 30 degrees and the psi of 0 degrees to 360 degrees. The compensation layer may include a liquid crystal layer having a cell gap of 3.5 μm and a phase delay Δλ value of 500 nm. In addition, the liquid crystal layer is interposed between two transparent electrode plates. In this case, when the stereoscopic glasses PG are within the dotted cone of FIG. 4, no voltage is applied to the liquid crystal constituting the compensation layer to turn off the compensation function of the compensation layer. However, when the stereoscopic glasses PG are out of the dotted cone of FIG. 3, a voltage is applied to the liquid crystal interposed between the two transparent electrode plates to turn on the compensation function of the compensation layer.

Accordingly, the left eye compensation layer LCL or the right eye compensation layer RCL may be implemented in which the compensation function is actively turned on and off according to the relative position of the stereoscopic glasses PG with respect to the display panel DP. In the above case, the case where only one of the ON state and the OFF state is selected as the compensation layer has been described. However, by dividing the viewing angle range in various ways, the compensation degree of the compensation layer may be implemented differently in more cases.

For example, the compensation zone may be set to three zones as shown in FIG. 5. FIG. 5 is a diagram illustrating a second embodiment of dividing a compensation section according to a position change of stereoscopic glasses in a patterned retarder type 3D imaging system according to the present invention. That is, the value of θ is 90 degrees to 60 degrees and ψ is set to the front range NR satisfying all of 0 degrees to 360 degrees, the θ value is 60 degrees to 30 degrees and ψ is all 0 degrees to 360 degrees. It is possible to set the range satisfying to the first viewing angle range R1 and to set the other range to the second viewing angle range R2. In this case, the left eye compensation layer LCL or the right eye compensation layer RCL is turned off in the front range NR, and the left eye compensation layer LCL or the right eye compensation layer RCL is the first in the first viewing angle range R1. In the second viewing angle range R2, the left eye compensation layer LCL or the right eye compensation layer RCL may be adjusted to have the second compensation value. To this end, a voltage value corresponding to the first compensation value and a voltage value corresponding to the second compensation value are stored in the memory or the look-up table, and the voltage value applied to the liquid crystal layer is changed according to the position of the stereoscopic glasses PG. Can be implemented.

In addition, as described above, the compensation section may not be distinguished only by the concentric circle, and the compensation section may be added according to the quadrant. FIG. 6 is a diagram illustrating a third embodiment of dividing a compensation section according to a position change of stereoscopic glasses in a patterned retarder type 3D imaging system according to the present invention. For example, the value of θ is 90 degrees to 40 degrees, and ψ can be set to the front range NR that satisfies both 0 degrees and 360 degrees. In addition, the value of θ satisfies 40 degrees to 0 degrees, and ψ satisfies both 0 degrees and 90 degrees as the first viewing angle range R1, and the value of θ satisfies 40 degrees to 0 degrees and ψ is 90 degrees to The range that satisfies all 180 degrees is the second viewing angle range R2, the value θ satisfies 40 degrees to 0 degrees, and the range where ψ satisfies all 180 degrees to 270 degrees is the third viewing angle range R3, The value of θ satisfies 40 degrees to 0 degrees and a range in which ψ satisfies all of 270 degrees to 360 degrees can be divided into a fourth viewing angle range R5.

In this case, in the case of the frontal range, the setting is such that the voltage value is 0V. However, in each of the first to fourth viewing angle ranges, the left eye compensation layer LCL and the right eye compensation layer RCL may be set to have different voltage values. For example, one of the left eyeglass window LG and the right eyeglass window RG may be maintained in an OFF state, and the other may adjust the compensation layer with a voltage value stored in the memory unit. Alternatively, the left eye compensation layer LCL and the right eye compensation layer RCL may be differently controlled so that the left eye window LG and the right eye window RG have different compensation values independently of each other.

The liquid crystal layer constituting the compensation layer may be a vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode. Alternatively, it may be a horizontal electric field driving method such as an in plane switching (IPS) mode and a fringe field switching (FFS) mode.

In the above embodiments, the reference point is described as being placed on the reference point transmitter OC positioned at the bottom center of the display panel DP. However, the reference point may be set as the center point of the display panel DP. In this case, the position of the reference point transmitter OC may be located at the lower center or the upper center of the display panel DP as it is, but it is preferable to convert the values of θ and ψ using a coordinate transformation equation. This coordinate conversion is a well-known scientific and technical content in the coordinate system, so a detailed description thereof will be omitted.

In the above embodiments, the reference point emitter OR for informing the reference point is installed in the display panel DP, and the operation unit for calculating the position of the stereoscopic glasses PG with respect to the reference point is provided in the stereoscopic glasses PG. As described. However, for convenience, the stereoscopic glasses PG includes a transceiver for transmitting and receiving data to and from the display panel DP, and displays compensation information according to the position detection of the stereoscopic glasses PG and the position of the stereoscopic glasses PG. It can also be installed in the panel DP. In this case, the stereoscopic glasses PG may include only a controller for receiving compensation information through the transmission and reception device and driving the compensation layer CL accordingly.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

DP: Display panel SL: Lower glass substrate
SU: upper glass substrate PL: lower polarizing film
PU: upper polarizing film PG: polarizing glasses
P1: first circularly polarized filter P2: second circularly polarized filter
RG: Right eye view LG: Left eye view
PR: Patterned Retarder RT1: First Retarder
RT2: Second Retarder
LCL: Left eye compensation layer RCL: Right eye compensation layer
OR: reference point transmitter TS: user tracking sensor
NR: front range R1: first viewing angle range
R2: second viewing angle range R3: third viewing angle range
R4: Fourth viewing angle range P: Position of the stereoscopic glasses

Claims (9)

A communication unit receiving a relative position value with the display panel;
A left eyeglass window having a left eye compensation layer, a first circular polarizing filter layer, and a left eye linear polarizing filter layer;
A right eye window having a right eye compensation layer, a second circularly polarized filter layer, and a right eye linearly polarized filter layer; And
And a control unit configured to adjust the left eye compensation layer and the right eye compensation layer to the position values received through the communication unit.
The method of claim 1,
And the first circularly polarized filter layer and the second circularly polarized filter layer include patterned retarders in directions perpendicular to each other.
The method of claim 1,
And a memory unit which stores, in advance, a value for controlling the left eye compensation layer and the right eye compensation layer according to the position value.
The method of claim 1, wherein the position value,
A front range section of the display panel; And
Active wide viewing angle compensation stereoscopic glasses, characterized in that divided into a wide viewing angle range section other than the front range section.
The method of claim 4, wherein
The control unit does not operate the left eye compensation layer and the right eye compensation layer in the front range section;
And the control unit adjusts at least one of the left eye compensation layer and the right eye compensation layer to a predetermined value in the wide viewing angle range section.
The method of claim 4, wherein
The wide viewing angle range section is active wide viewing angle compensation stereoscopic glasses, characterized in that divided into at least two or more ranges.
The method of claim 1,
And the left eye compensation layer and the right eye compensation layer include a liquid crystal layer and two electrode layers for driving the liquid crystal layer.
The method of claim 7, wherein
And the control unit drives the liquid crystal layer at a predetermined voltage value according to the position value.
The method of claim 7, wherein
And the liquid crystal layer includes at least one of a horizontal electric field driving method and a vertical electric field driving method.

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