KR101720331B1 - 3-dimensional image system - Google Patents

Abstract

The present invention relates to improving the response and operating speed of a liquid crystal shutter used in a stereoscopic image system. The stereoscopic image system according to the present invention includes an image display device for displaying a left eye image and a right eye image; A liquid crystal shutter having optical means for changing the traveling direction of light vertically incident on the image display device to have a predetermined inclination angle; The left eye image includes a left eye image and the right eye image is passed through a right eye image. Therefore, the change of the light transmittance can be easily accomplished simply by changing the light incident angle, and the crosstalk of the stereoscopic image is improved.

Description

[0002] 3-DIMENSIONAL IMAGE SYSTEM [0003]

The present invention relates to a stereoscopic image system. More particularly, the present invention relates to improving the response and operating speed of a liquid crystal shutter used in a stereoscopic image system.

3D stereoscopic image technology is a next generation information and communication service and it is applied to information communication, broadcast, medical, education and training, military, game, animation, virtual reality, CAD, industrial technology etc. It is a key infrastructure technology of next-generation realistic 3-D stereoscopic multimedia communication that is widely required in various fields.

Generally, the three-dimensional sensation perceived by a person depends on the degree of thickness change of the lens depending on the position of the object to be observed, the angular difference between both eyes and the object, the difference in position and shape of the object on the left and right eyes, Time difference, and various psychological and memory effects. Among them, binocular disparity, which occurs when two eyes of a person are located about 6 to 7 cm away from each other in the horizontal direction, is the most important factor of the three-dimensional feeling. In other words, the binocular disparity causes the object to be viewed with an angle difference. Due to this difference, the images coming into each eye have different phases. When these two images are transmitted to the brain through the retina, It is possible to feel the original three-dimensional stereoscopic image by precisely fusing each other.

There are many ways to realize such a three-dimensional stereoscopic image, and in particular, a shutter system using a liquid crystal panel, which is a method of alternately displaying a left-eye image and a right-eye image, is in the spotlight.

1 is a view showing a 3D image system using a display device having a liquid crystal shutter panel according to a related art. A three-dimensional stereoscopic image system using a liquid crystal shutter includes an image display unit 10 for displaying 2D and 3D images, a liquid crystal shutter 20 which operates when a 3D image is displayed and selectively displays a left eye image and a right eye image, , And the left eye image is a left eye image and the right eye image is a 3D eye image (30) which is sent only to the right eye.

The image display unit 10 implements a 2D image or a 3D image including a left eye image and a right eye image alternately displayed in units of a frame period. The image display unit 10 may be a cathode ray tube, a cathode ray tube (CRT), a liquid crystal display (LCD), or a plasma display (PDP).

When the image display unit 10 implements the 3D image, the liquid crystal shutter 2 operates so that the left eye image has a first polarization within the period of displaying the left eye image, It operates so as to have two polarizations. 2 is a sectional view showing in detail the structure of a liquid crystal shutter according to the prior art. For example, the liquid crystal shutter 20 has a structure in which a transparent first substrate 11 and a second substrate 31 are bonded together and a liquid crystal layer 51 is interposed therebetween. A first transparent electrode 13 and a second transparent electrode 33 for driving the liquid crystal layer 51 are formed on the inner surfaces of the first substrate 11 and the second substrate 31. In the initial state, the liquid crystal layer 51 is oriented so that light polarized in the first direction can be transmitted while maintaining the state of polarization. When a voltage is applied between the first transparent electrode 13 and the second transparent electrode 33, the alignment state of the liquid crystal layer 51 is changed, and the light polarized in the first direction passing through the liquid crystal layer 51 is orthogonal The polarization state changes in the second direction.

Finally, as shown in FIG. 3, a user wears a 3D image to watch the 3D image normally. The left eye shading window 71 transmits polarized light in a first direction (Pol1) ) Polarizing glasses (30) including a right eye shading window (73) that transmits polarized light. 3 is a view showing an example of polarizing glasses of the 3D image system according to FIG.

The operation principle of the 3D image system using the display device having the liquid crystal shutter panel will be described below. 4 is a graph showing the operation principle of a display device provided with the liquid crystal shutter 20. Fig. Here, a state in which the left-eye image (L _image ) and the right-eye image (R _image ) are alternately displayed with a cycle of 1/60 second, and a case in which the liquid crystal shutter is alternately turned ON-> ON, .

The image display unit 10 displays a left eye image having a first polarization direction for 1/60 second. At this time, no voltage is applied to the first electrode 13 and the second electrode 33 of the liquid crystal shutter 20. Then, the left eye image passed through the liquid crystal shutter 20 is maintained in a polarized state in the first direction, which is the original polarization direction. The limage having the polarization in the first direction passes through the left eye window 71 and the right eye window 73 of the polarizing glasses 30 worn by the viewer. Therefore, the user is in a state of recognizing only the left eye image.

The right image Rimage having the first polarization direction is displayed on the image display unit 10 for the next 1/60 second. At this time, a liquid crystal operating voltage is applied between the first electrode 13 and the second electrode 33 of the liquid crystal shutter 20. Then, the arrangement direction of the liquid crystal cells 51 is changed, and the liquid crystal cell 51 rotates the polarization direction of the right eye image by 90 degrees. As a result, the right-eye image Rimage having passed through the liquid crystal shutter 20 has its polarization direction changed in the second direction. The right-eye image Rimage polarized in the second direction passes through the right eye window 73 without passing through the left eye window 71 of the polarizing glasses 30 worn by the viewer. Therefore, the user is in a state of recognizing only the right eye image.

Thus, the left eye image is recognized for the first 1/60 second, the right eye image is recognized for the next 1/60 second, and one 3D image can be completely recognized for 1/30 second . By repeating this process, 3D image can be appreciated. FIG. 4 shows a case in which a 3D image having a 1/30 period is reproduced in a state in which the left eye image (Limage) or the right eye image (Rimage) is alternately displayed with a duration of 1/60 second. When the liquid crystal shutter 20 is driven in accordance with the cycle of alternately displaying the left eye image and the right eye image in the image display unit 10, the 3D image passing through the liquid crystal cell 51 can be normally viewed according to the driving signal.

In order to realize a clearer 3D image, in order to enjoy a 3D image with a frequency faster than 30 Hz, it is necessary to pass through a liquid crystal cell according to fast switching signals of a left eye image and a right eye image. In order to realize a 3D image of 30 Hz or more and 60 Hz, a left eye image and a right eye image should be displayed for 1/120 second, respectively. 5 is a graph showing the driving state of the 3D image display system of 60 Hz. Here, when the liquid crystal shutter 20 switches between Voff and Von in a 3D image display system displaying a left eye image and a right eye image for 1/120 second for realizing a 3D image of 60 Hz, And shows the change of the liquid crystal cell transmittance. The dotted line is a graph showing the switching state between Voff and Von of the liquid crystal shutter 20 and the solid line is a graph showing the change in the transmittance of light passing through the liquid crystal cell 51. [

Referring to FIG. 5, when the liquid crystal shutter 20 is turned from the OFF state to the ON state, the switching time T1, which is changed from the left eye image (L _image ) to the right eye image (R _image ), is converted within a time as short as 1 ms or less. However, when the liquid crystal shutter 20 is turned from the ON state to the OFF state, the switching time T2 for changing from the right eye image (R _image ) to the left eye image (L _image ) has a considerably large value of about 1.6 to 2.0 ms. That is, there is a problem in that crosstalk occurs between the left eye image and the right eye image constituting the three-dimensional image because the time for changing from the right eye image to the left eye image is delayed from the time required for changing from the left eye image to the right eye image.

The difference between the switching times T1 and T2 is about 1 ms and is small. In the 30 Hz 3D image shown in FIG. 4, the time size of 1 ms does not affect much, but it has a considerable influence on the 60 Hz 3D image shown in FIG. In particular, when a 3D image of 120 Hz is implemented as shown in FIG. 6, it can be seen that a time difference of 1 ms affects image switching by more than 30%. 6 is a graph showing the driving state of the 3D image display system at 120 Hz.

The time T1 is the time at which the liquid crystal is restored to the initial alignment state and the time T2 is the time for the liquid crystal to be reoriented by applying a voltage in the initial liquid crystal alignment state and is determined according to the liquid crystal material. It is already decided according to whether it is free. Therefore, it is practically limited to reduce the T2 time to almost the same level as the T1 time.

An object of the present invention is to provide a 3D image display system which displays a good 3D image by reducing crosstalk between a left eye image and a right eye image in a 3D image display system. It is another object of the present invention to provide a 3D image system that maintains a uniform light transmittance through a liquid crystal shutter, which is a component that implements a 3D image.

In order to accomplish the object of the present invention, a stereoscopic image system according to the present invention includes an image display device for displaying a left eye image and a right eye image; A liquid crystal shutter having optical means for changing the traveling direction of light vertically incident on the image display device to have a predetermined inclination angle; The left eye image includes a left eye image and the right eye image is passed through a right eye image.

Wherein the image display device polarizes the left eye image and the right eye image in a first direction; Wherein the liquid crystal shutter allows the polarization state of the left eye and the right eye images to pass therethrough when the liquid crystal shutter is in the OFF state and changes the polarization state of the left eye and the right eye image to the second direction in the ON state; The stereoscopic glasses include a left eye tilt having a polarization axis in a first direction and a right eye tilt having a polarization axis in a second direction.

Also, the image display device may polarize the left eye image and the right eye image in a first direction; Wherein the stereoscopic glasses further include a left and right eyepiece window having a polarization axis in a first direction, wherein the left and right eyepiece windows are attached to the liquid crystal shutter including the optical film; When displaying the left eye image in the image display apparatus, the liquid crystal shutter of the left eye lens is in the OFF state and the liquid crystal shutter of the right eye lens is in the ON state; The liquid crystal shutter of the left eye window is in the ON state and the liquid crystal shutter of the right eye window is in the OFF state when the right eye image is displayed in the image display apparatus.

And the optical means has a plurality of triangle-shaped mountain patterns.

And the acute angle triangular pattern is characterized in that the small acute angle is one selected from the range of 15 DEG to 25 DEG.

And the pitch of the third triangular pattern is a value selected from the range of 30 to 70 mu m.

Wherein the liquid crystal shutter comprises: a first transparent substrate; A second transparent substrate facing the first transparent substrate; A first transparent electrode and a second transparent electrode formed on inner side surfaces of the first transparent substrate and the second transparent substrate; And a liquid crystal layer interposed between the first transparent electrode and the second transparent electrode.

The stereoscopic image system according to the present invention is a liquid crystal shutter that selectively passes a left eye image and a right eye image to a left eye lens and a right eye lens respectively and changes the light transmittance of the liquid crystal shutter rapidly to thereby reduce crosstalk of the 3D image . The stereoscopic image system according to the present invention reduces the crosstalk of the 3D image by making the difference in the transmittance change occurring when the ON-OFF state of the liquid crystal is changed within the same range. The stereoscopic image system according to the present invention has an advantage of being easy to implement, simple to manufacture, and low in cost by using an easy method of changing the incident angle, not a difficult method of changing the liquid crystal characteristics of the liquid crystal shutter.

Hereinafter, a three-dimensional stereoscopic image system using a liquid crystal shutter according to the present invention will be described with reference to FIGS. 7 to 22. FIG. FIG. 7 is a schematic view showing a structure of a three-dimensional stereoscopic image system according to the present invention.

Referring to FIG. 7, the 3D stereoscopic image system using a liquid crystal shutter according to the present invention includes an image display unit 100, 3D glasses 300 to be worn by a user viewing a 3D image displayed on the image display unit 100, A liquid crystal shutter 200 positioned between the image display unit 100 and the 3D glasses 300 and a liquid crystal shutter 200 disposed between the image display unit 100 and the 3D glasses 300. The liquid crystal shutter 200 emits light from the liquid crystal shutter 200, And an optical means (241) for changing the angle of inclination with respect to a predetermined angle. The optical means 241 emits the light from the image display unit 100 and changes the traveling direction of the vertically incident light to an angle that is inclined by about 10 to 20 degrees with respect to the vertical direction to have an incident angle of 10 to 20 degrees And enters the liquid crystal shutter 200.

The image display unit 100 according to the present invention implements a 3D image including a left eye image and a right eye image alternately displayed in units of a 2D image or a frame period. The image display unit 100 may be a cathode ray tube, a cathode ray tube (CRT), a liquid crystal display (LCD), a plasma display (PDP), an organic light emitting diode (OLED) . ≪ / RTI >

The liquid crystal shutter 200 according to the present invention has a structure as shown in Fig. 8 is a sectional view showing the structure of a liquid crystal shutter 200 according to the present invention.

The liquid crystal shutter 200 according to the present invention has a structure in which a transparent first substrate 211 and a second substrate 231 are bonded together and a liquid crystal layer 251 is interposed therebetween. A first transparent electrode 213 and a second transparent electrode 233 for driving the liquid crystal layer 251 are formed on the inner surfaces of the first substrate 211 and the second substrate 231. In the initial state, the liquid crystal layer 251 can transmit the polarized state of the polarized light in the first direction while maintaining the polarized state. When a voltage is applied between the first transparent electrode 213 and the second transparent electrode 233, the alignment state of the liquid crystal layer 251 is changed, and the polarization state of the polarized light in the first direction is changed in a second direction Change it. The liquid crystal layer 251 may be a twisted nematic mode, a VA (vertical alignment) mode, or an ECB (Electrically Controlled Birefringence) liquid crystal. Further, the first substrate 211 is further provided with an optical means 241 in front of it.

The objective of the optical means 241 may be an optical film that refracts light incident perpendicularly to the surface of the liquid crystal layer 251 to have an incident angle of 10 to 20 degrees with the liquid crystal layer 251. The reason why the light incident perpendicularly to the liquid crystal layer 251 is refracted is as follows.

9 is a graph showing a change in transmittance according to incident light of light incident on the liquid crystal layer when the TN mode liquid crystal changes from the Von state to the Voff state. 9, the dotted line is a graph showing a change in transmittance of light incident perpendicularly to the surface of the liquid crystal layer through the liquid crystal layer, and a solid line indicates a change in the incident light And a change in transmittance of the liquid crystal layer. As can be seen from the dotted line graph, when the TN mode liquid crystal changes from the Von state to the Voff state, the time required for changing the transmittance of the light vertically incident on the liquid crystal layer surface from the minimum value to the maximum value is considerably large 2.0 ms). On the other hand, as can be seen from the solid line graph, when the TN mode liquid crystal changes from the Von state to the Voff state, the time required for changing the transmittance of light incident on the surface of the liquid crystal layer at an inclination angle of 10 to 20 degrees from the minimum value to the maximum value Lt; / RTI > has a much smaller value (about 1.1 ms).

Therefore, the liquid crystal shutter 200 according to the present invention includes the optical means 241 for changing the angle of incidence of light vertically incident on the front end of the liquid crystal layer 251 so as to have an inclination angle of about 10 degrees to about 20 degrees.

An example of such an optical means 241 may be an image direction film in which a plurality of inclined prisms are formed. Fig. 10 is an enlarged view showing the structure of the optical film showing an example of the optical means. The optical film shown in Fig. 10 has a surface in which a right triangular prism pattern 290 having a small acute angle alpha of 20 DEG and a large acute angle beta 70 DEG is repeated at a pitch of about 50 mu m.

The influence of such a prism on vertical incident light is examined. 11 is an enlarged view showing the behavior of light incident on a prism having a right triangular shape. Referring to FIG. 11, light vertically incident on the right triangular prism pattern 290 is refracted at an angle smaller than angle? That is, the vertical incident light is changed to have an oblique incident angle. For example, if α is 20 °, the incident angle of the vertical incident light differs depending on the material of the film, but the incident angle θ is changed to have a value between about 10 ° and 20 °. Here, the prism pattern 290 is not fixed to the above limited value. The small acute angle alpha can be selected in the range of 15 DEG to 25 DEG and the large acute angle beta in the range of 65 DEG to 75 DEG so that the angle of incidence θ has a value between about 10 and 20 DEG. Also, the pitch of the prism patterns 290 can be appropriately selected from the range of 30 to 70 mu m.

The 3D image system according to the present invention will be described in more detail with reference to specific embodiments using the features of the present invention. 12 is a diagram showing a 3D image system according to the first embodiment of the present invention.

In this system, an image display unit 100 for implementing a 3D image including a left image and a right image alternately displayed in units of a 2D image or a frame period is provided. The image display unit 100 may be a cathode ray tube, a cathode ray tube (CRT), a liquid crystal display (LCD), or a plasma display (PDP). Preferably, a polarizing film is mounted on the surface of the image display unit 100, and all the images including the left eye image and the right eye image are polarized in a first direction.

When the image display unit 100 implements the 3D image, the left eye image is operated to maintain the polarization in the first direction within the period in which the left eye image is displayed. In the period in which the right eye image is displayed, And a liquid crystal shutter 200 that operates to change the polarization state in one direction to the polarization direction in the second direction. The optical film 241 is provided on the surface of the liquid crystal shutter 200 so that the angle of incidence of incident light is inclined by a predetermined angle with respect to the vertical direction. Therefore, as described above, in the first embodiment also, the liquid crystal shutter 200 having the structure as shown in Fig. 8 is provided. It is preferable that the image display unit 100 and the liquid crystal shutter 200 including the optical film 241 have a structure in which the optical films 241 are bonded together in a manner interposed therebetween.

Finally, in order to view a 3D image normally, a user wears a left eye shading window 371 that transmits polarized light in a first direction (Pol1) and a left eye shading window 371 that is polarized in a second direction And a 3D glasses 300 including a right eye shading window 373 that transmits polarized light. 13 is a view showing the 3D glasses according to the first embodiment of the present invention.

The operation principle of 3D image representation in this structure will be discussed. For example, the left eye image polarized in the first direction is displayed on the image display unit 100 for 1/120 seconds (or 1/240 seconds). The left eye image is incident on the liquid crystal shutter 200 through the optical film 241 with an incident angle of about 10 to 20 degrees. At this time, the liquid crystal shutter 200 is in the OFF state. Therefore, the left eye image maintains the first polarization state according to the liquid crystal initial alignment state of the liquid crystal shutter 200. The left eye image having the first polarization axis is recognized only by the user through the left eye window 371 having the first polarization axis of the polarizing glasses 300. [

During the next 1/120 second (or 1/240 second), the image display unit 100 displays the right-eye image polarized in the first direction. The right eye image has an incident angle of about 10 to 20 degrees through the optical film 241 and enters the liquid crystal shutter 200. At this time, the liquid crystal shutter 200 is switched from the OFF state to the ON state. Therefore, the right-eye image polarized in the first direction passes through the rearranged liquid crystal layer 251, and the polarizing direction changes to the second direction orthogonal to the first direction. Therefore, the right-eye image changed to the second polarization axis is recognized only by the user through the right-eye incision window 373 having the second polarization axis of the polarization auris 300. [ At this time, the light transmittance of the TN mode liquid crystal layer 251 constituting the liquid crystal shutter 200 changes at a very high speed of 1 ms or less.

Then, during the next 1/120 second (or 1/240 second), the image display unit 100 again displays the left eye image polarized in the first direction. The left eye image has an incident angle of 10 to 20 degrees through the optical film 241 and is incident on the liquid crystal shutter 200. At this time, the liquid crystal shutter 200 is switched from the ON state to the OFF state. Therefore, the left eye image having the first polarization axis is recognized only by the user through the left eye window 371 having the first polarization axis of the polarizing glasses 300. At this time, since the right eye image incident on the liquid crystal shutter 200 has an incident angle of 10 to 20 degrees, the change in light transmittance of the TN mode liquid crystal layer 251 constituting the liquid crystal shutter 200 is the same as the solid line in FIG. That is, the change in light transmittance takes place within about 1.1 ms. In other words, although the original property of the liquid crystal layer 251 is not changed, by making the incident light have an inclination angle of 10 to 20 degrees, the transmittance change of the liquid crystal shutter 251 of the liquid crystal shutter 200 can be made faster, (200) reacts.

In this way, when the liquid crystal shutter 200 is switched from the OFF state to the ON state, it is switched according to the reaction speed of 1 ms or less, which is the reaction speed of the TN mode liquid crystal layer 251 constituting the liquid crystal shutter 200. When the liquid crystal shutter 200 is switched from the ON state to the OFF state, the incident angle of the light incident on the liquid crystal shutter 200 is 10 to 20 degrees, The change in the light transmittance actually passing through the liquid crystal layer 251 is quickly changed to about 1.1 ms so that the reaction speed is improved.

Another embodiment according to the present invention will be described. 14 is a diagram showing a 3D image system according to the second embodiment of the present invention.

In the first embodiment, the case where the liquid crystal shutter 200 including the optical film 241 is attached to the front surface of the image display unit 100 has been described. In the second embodiment, a case in which the liquid crystal shutter 200 including the optical film 241 is attached to the polarizing glasses will be described. Therefore, the 3D image system according to the second embodiment includes the image display unit 100 and the shutter glasses 500.

The image display unit 100 may be a cathode ray tube, a cathode ray tube (CRT), a liquid crystal display (LCD), or a plasma display (PDP). Although it is not shown in the drawing, it is preferable that a polarizing film having a first polarization axis is included on the surface of the image display section 100, and the image display section 100 displays an image polarized in the first direction.

The structure of the shutter glasses 500 including the optical film 241 is shown in Figs. 15 and 16. Fig. 15 is a view showing the structure of the shutter glasses 500 according to the second embodiment. The shutter glasses 500 have a form in which a liquid crystal shutter window 580 is coupled before the polarizing glasses 300. A liquid crystal shutter window 580 having the structure described with reference to FIG. 8 is disposed on the entire surface of the polarizing glasses 300 as described in FIG.

16 is a cross-sectional view showing the structure of the shutter glasses 500 according to the second embodiment, cut at the perforated line A-A 'in Fig. The sectional structure of the shutter glasses 500 will be described below. The liquid crystal shutter window 580 has a structure in which the first transparent substrate 511 and the second transparent substrate 531 are bonded together with the liquid crystal layer 551 interposed therebetween. The liquid crystal layer 551 is preferably a TN mode, a VA mode, or an ECB mode liquid crystal. A first transparent electrode 513 and a second transparent electrode 523 are formed on inner surfaces of the first transparent substrate 511 and the second transparent substrate 531 to drive the TN liquid crystal layer 551. An optical film 541 is attached to the surface of the first transparent substrate 511 which is a surface. The rear surface of the second transparent substrate 523 is attached to the left eye shading window 371 and the right eye shading window 373 of the polarizing glasses 300. [ The polarizing glasses 300 include a left eye shading window 371 that transmits polarized light in the first direction and a right eye shading window 373 that transmits polarized light in the second direction.

The operation principle of 3D image representation in this structure will be discussed. For example, the left eye image polarized in the first direction is displayed on the image display unit 100 for 1/120 seconds (or 1/240 seconds). The left eye image is incident on the shutter glasses 500. The left eye image incident on the liquid crystal shutter window 580 of the shutter glasses 500 is incident on the liquid crystal layer 551 through the optical film 541 with an incident angle of about 10 to 20 degrees. At this time, the liquid crystal shutter window 580 of the shutter glasses 500 is in an initial (OFF) state in which no voltage is applied. Therefore, the left eye image maintains the first polarization axis state according to the liquid crystal initial alignment state of the liquid crystal layer 551. The left eye image having the first polarization axis is recognized by the user through the left eye window 371 having the first polarization axis of the shutter glasses 500. [ On the other hand, the left eye image having the first polarization axis can not pass through the right eye window 373 having the second polarization axis, so that the left eye image is not recognized by the user through the right eye. That is, the left eye image is recognized by the user only through the left eye view window 371.

During the next 1/120 second (or 1/240 second), the image display unit 100 displays the right-eye image polarized in the first direction. The right eye image is incident on the shutter glasses 500. The right eye image incident on the liquid crystal shutter window 580 of the shutter glasses 500 enters the liquid crystal layer 551 through the optical film 541 at an incident angle of about 10 to 20 degrees. At this time, the shutter glasses 500 are changed from the OFF state to the ON state. Therefore, the liquid crystal layer 551 of the shutter glasses 500 is twisted by the applied voltage. Then, the right eye image passes through the liquid crystal layer 551, and the polarization state is changed by 90 degrees. That is, the right-eye image is changed to the second polarization state through the liquid crystal layer 551 of the liquid crystal shutter window 580. The right-eye image having the second polarization axis is recognized by the user through the right-eye slope window 373 having the second polarization axis of the shutter glasses 500. At this time, the light transmittance of the TN mode liquid crystal layer 551 constituting the shutter glasses 500 changes at a very high speed of 1 ms or less. On the other hand, the right eye image changed to the second polarization state by allowing the shutter glasses 500 to pass through does not pass through the left eye window 371 having the first polarization direction, and the right eye image is not recognized by the user through the left eye. That is, the right eye image is recognized only by the user through the right eye cyan (373).

Also, during the next 1/120 second (or 1/240 second), the left-eye image polarized again in the first direction is displayed. At this time, the liquid crystal shutter window 580 of the shutter glasses 500 is switched from the ON state to the OFF state. At this time, since the left eye image incident on the shutter glasses 500 has an incident angle of 10 to 20 degrees by the optical film 541, the change in light transmittance of the TN mode liquid crystal layer 551 of the shutter eyeglasses 500, It is the same as the solid line. That is, the change in light transmittance takes place within about 1.1 ms. In other words, although the original property of the liquid crystal layer 551 has not changed, by making the incident light have an inclination angle of 10 to 20 degrees, the transmittance change of the liquid crystal shutter window 580 can be made faster, The shutter window 580 has a result of reacting.

The liquid crystal shutter window 580 constituting the shutter glasses 500 in the embodiment 2 is constituted by one window. However, the liquid crystal shutter window 580 may be formed separately for the left eye window 371 and the right eye window 373, respectively.

Hereinafter, another embodiment according to the present invention will be described. 17 is a diagram showing a 3D image system according to the third embodiment of the present invention.

As in the second embodiment, a case in which the liquid crystal shutter 200 including the optical film 541 is attached to polarizing glasses will be described in the third embodiment. Therefore, the 3D image system according to the third embodiment includes the image display unit 100 and the shutter glasses 900 similarly to the second embodiment described above. However, if there is a difference from Embodiment 2, the structure of the shutter glasses 900 is different.

The image display unit 100 may be a cathode ray tube, a cathode ray tube (CRT), a liquid crystal display (LCD), or a plasma display (PDP). Although it is not shown in the drawing, it is preferable that the image display unit 100 includes a polarizing film having a first polarization axis, and the image display unit 100 displays an image polarized in the first direction.

The structure of the shutter glasses 900 including the optical film is shown in Figs. 18 and 19. 18 is a view showing the structure of the shutter glasses of the third embodiment. 19 is a cross-sectional view showing the structure of the shutter glasses of Example 3, which is cut along the perforated line B-B 'in Fig. The shutter glasses 900 according to the third embodiment have a structure in which polarizing glasses 400 and a liquid crystal shutter window 680 are attached. For example, the polarizing glasses 400 include a polarizing plate 401 having a first polarization direction (Pol1) on both the left eye side and the right eye side. The liquid crystal shutter window 680 includes a left eye shutter window 671 and a right eye shutter window 673 which are individually driven on the left eye and the right eye and are attached to the polarizing glasses 400.

Referring to Fig. 19, the structure of the shutter glasses 900 according to the third embodiment will be described. The left eye shutter window 671 and the right eye shutter window 673 have the same structure as the liquid crystal shutter shown in Fig. For example, the left-eye shutter window 671 has a structure in which the first transparent substrate 511L and the second transparent substrate 531L are bonded together with the liquid crystal layer 551L interposed therebetween. The liquid crystal layer 551L is preferably a TN mode, VA mode, or ECB mode liquid crystal. A first transparent electrode 513L and a second transparent electrode 533L are formed on the inner surfaces of the first transparent substrate 511L and the second transparent substrate 531L to drive the liquid crystal layer 551L. The right eye shutter window 673 has a structure in which the first transparent substrate 511R and the second transparent substrate 531R are bonded together with the liquid crystal layer 551R interposed therebetween. The liquid crystal layer 551R is preferably a TN mode, VA mode, or ECB mode liquid crystal. A first transparent electrode 513R and a second transparent electrode 533R are formed on inner surfaces of the first transparent substrate 511R and the second transparent substrate 531R to drive the liquid crystal layer 551R.

The left eye shutter window 671 and the right eye shutter window 673 having such a structure are arranged on the left and right eyes of the polarizing glasses 400 made of the polarizing plate 401 having the first polarization direction Pol1 on both the left and right eye sides Respectively.

The operation principle of 3D image representation in this structure will be discussed. 20 is a diagram showing the operation of the shutter glasses 900 of the 3D image system according to the third embodiment. For example, the left eye image polarized in the first direction is displayed on the image display unit 100 for 1/120 seconds (or 1/240 seconds). The left eye image is incident on the shutter glasses 900. The left eye image incident on the left eye shutter window 671 of the shutter glasses 900 is incident on the liquid crystal layer 551L through the optical film 541L with an incident angle of about 10 to 20 degrees. At this time, the left eye shutter window 671 of the shutter glasses 900 is in an initial (OFF) state in which no voltage is applied. Accordingly, the left eye image maintains the first polarization axis state according to the liquid crystal initial alignment state of the liquid crystal layer 551L. The left eye image having the first polarization axis is recognized as the left eye of the user through the polarizer 401 having the first polarization axis of the shutter glasses 900. [ On the other hand, the left eye image incident on the right eye shutter window 673 of the shutter glasses 900 is incident on the liquid crystal layer 551R through the optical film 541R at an incident angle of about 10 to 20 degrees. At this time, the right eye shutter window 673 of the shutter eyeglasses 900 is in a state in which voltage is applied (ON). Therefore, the liquid crystal layer 551R of the right eye shutter window 673 is twisted. As a result, the left-eye image incident through the right-eye shutter window 673 is changed to a second direction in which the polarization direction is perpendicular to the first direction. Therefore, the left eye image changed to the second polarization axis through the right eye shutter window 673 can not pass through the polarizer 401 having the first polarization axis of the shutter glasses 900, and is not recognized by the user. That is, while the left eye image is displayed, the left eye shutter window 671 of the shutter eyeglasses 900 maintains the OPEN state and the right eye shutter window 673 maintains the CLOSED state, The image is input to the left eye of the user through the left eye shutter window 671 only.

Next, the image display apparatus 100 displays the right-eye image polarized in the first direction for 1/120 seconds (or 1/240 seconds). The right eye image is incident on the shutter glasses 900. The right eye image incident on the left eye shutter window 671 of the shutter glasses 900 is incident on the liquid crystal layer 551L through the optical film 541L with an incident angle of about 10 to 20 degrees. At this time, the left eye shutter window 671 of the shutter glasses 900 is changed from the initial (OFF) state in which no voltage is applied to the ON state in which the voltage is applied. Therefore, the liquid crystal layer 551L of the left-eye shutter window 671 is twisted. As a result, the right-eye image incident through the left-eye shutter window 671 is changed to a second direction in which the polarization direction is perpendicular to the first direction. Therefore, the right-eye image changed to the second polarization axis can not pass through the polarizing plate 401 having the first polarization axis. The change in transmittance at this time is within 1 ms. On the other hand, the right eye image incident on the right eye shutter window 673 of the shutter eyeglasses 900 is incident on the liquid crystal layer 551R through the optical film 541R with an incident angle of about 10 to 20 degrees. At this time, the right eye shutter window 673 of the shutter glasses 900 is changed from the ON state to the OFF state. Therefore, the liquid crystal layer 551R of the right eye shutter window 673 returns to the initial state. Accordingly, the right-eye shutter window 673 allows the right-eye image polarized in the first direction to pass therethrough, and the right-eye image passes through the polarizing plate 401 and is recognized by the user. At this time, since the right eye image incident on the right eye shutter window 673 has an incident angle of approximately 10 to 20 degrees and enters the liquid crystal layer 551R, the change in light transmittance is within 1.1 ms. As a result, during the time when the right eye image is displayed, the left eye shutter window 671 of the shutter eyeglasses 900 maintains the CLOSE state, and the right eye shutter window 673 remains in the OPEN state, The image is input to the right eye of the user through only the right eye shutter window 673. [ Then, in both right eye and left eye, OPEN-CLOSE is performed in approximately the same conversion time within about 1.1 ms.

Then, the left-eye image polarized in the first direction on the image display unit 100 is displayed again for 1/120 seconds (or 1/240 seconds). At this time, the left-eye shutter window 671 changes from the ON state to the OFF state, and passes the left-eye image. At this time, since the left eye image incident on the left eye shutter window 671 has an incident angle of approximately 10 to 20 degrees and enters the liquid crystal layer 551L, the change in light transmittance is within 1.1 ms. On the other hand, the right eye shutter window 673 is changed from the ON state to the OFF state, and the polarizing axis of the left eye image is changed so as not to pass through the polarizing plate 401. This conversion takes place within 1 ms. As a result, during the time when the left eye image is displayed, the left eye shutter window 671 of the shutter eyeglasses 900 keeps the OPEN state and the right eye shutter window 673 keeps the CLOSED state, The image is input to the left eye of the user through the left eye shutter window 671 only. Both the right eye and left eye are OPEN-CLOSE in approximately the same conversion time within about 1.1 ms.

Up to now, in Embodiments 1 to 3, a structure in which additional optical films 241, 541, 541L, and 541R are additionally provided has been described. However, in accordance with the convenience of the manufacturer, the first transparent substrates 211 and 511 constituting the liquid crystal shutter 200 or the shutter glasses 300, 500 and 900 without using the optical films 241, 541, 541L and 541R , 511L, and 511R may be formed of an optical substrate having the same properties as the optical films 241, 541, 541L, and 541R. 21 shows the fourth embodiment of the present invention in which the liquid crystal shutter 200 shown in Fig. 8 does not use the optical film 241 separately but the first transparent substrate 211 constituting the liquid crystal shutter 200, Is replaced with an optical substrate 243. It should be noted that the vertical incidence angle must be changed before the light emitted from the image display unit 100 is incident on the liquid crystal cell 251, One transparent substrate 243 is preferable.

As a fifth embodiment of the present invention, a prism pattern having a right triangular shape included in the optical film 241 or the optical substrate 243 may be configured differently. 22 is a view showing an example of a prism pattern 291 of another configuration having a right triangular shape. In Example 5, the arrangement was changed so that the hypotenuse of the right-angled triangle toward the back faced the front.

In the detailed embodiments of the present invention described above, the left eye image is recognized only in the left eye and the right eye image in the right eye only by using the liquid crystal shutter and the polarizing glasses for changing the polarizing properties of the polarized left eye image and the right eye image. Here, the first polarization direction is described as a horizontal direction and the second polarization direction is described as a vertical direction, but the present invention is not limited thereto. That is, the first polarization direction can have any one selected direction within the range of 0 degree to 360 degrees, and the second polarization direction is configured to be perpendicular to the first polarization direction.

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.

1 is a view showing a 3D image system using a display device having a liquid crystal shutter panel according to a related art.

2 is a sectional view showing the structure of a liquid crystal shutter of the 3D image system according to FIG.

3 is a view showing polarization glasses of the 3D image system according to FIG. 1;

4 is a graph showing the operation principle of a display device having a liquid crystal shutter panel.

5 is a graph showing a driving state of a 3D video display system of 60 Hz.

6 is a graph showing a driving state of a 3D video display system at 120 Hz;

FIG. 7 is a schematic view showing a structure of a three-dimensional stereoscopic image system according to the present invention. FIG.

8 is a sectional view showing a structure of a liquid crystal shutter 200 according to the present invention.

9 is a graph showing a change in transmittance according to incident light of light incident on the liquid crystal layer when the TN mode liquid crystal changes from the Von state to the Voff state.

10 is an enlarged view showing the structure of an optical film showing an example of an optical means.

11 is an enlarged view showing the behavior of light incident on a prism of a right triangular shape.

12 is a view showing a 3D image system according to the first embodiment of the present invention.

13 is a view showing the 3D glasses according to the first embodiment of the present invention.

14 is a view showing a 3D image system according to a second embodiment of the present invention.

15 is a view showing the structure of the shutter glasses according to the second embodiment;

16 is a sectional view showing the structure of the shutter glasses according to the second embodiment;

17 is a view showing a 3D image system according to the third embodiment of the present invention.

18 is a view showing the structure of the shutter glasses of the third embodiment;

19 is a sectional view showing the structure of the shutter glasses of the third embodiment

20 is a view showing the operation of the shutter glasses of the 3D image system according to the third embodiment;

21 is a view showing Embodiment 4 of the present invention.

22 is a view showing an example of a prism pattern having another configuration having a right triangular shape;

Description of the Related Art

10, 100: image display section 20, 200: liquid crystal shutter

30, 300: 3D glasses 11, 211: first substrate

13, 213: first electrode 51, 251: liquid crystal layer

33, 233: second electrode 31, 231: second substrate

71, 371: Left eye Kyeongchang 73, 373: Right eye kyung

290, 291: prism pattern

400: Polarizing glasses 401: Polarizing plate

580, 680: liquid crystal shutter window 671: left-eye shutter window

673: Right eye shutter window 500, 900: Shutter glasses

241: Optical film 243: Optical substrate

Claims (10)

An image display device for displaying the left eye image and the right eye image by polarizing the left eye image and the right eye image in a first direction; Optical means for changing an incident angle of light incident vertically from the image display device to have a predetermined angle of inclination with respect to the vertical direction; A liquid crystal shutter for determining a polarization state of the left eye image and the right eye image through the optical means as one of maintenance and change; Wherein the left eye image includes a left eye image and the right eye image is passed through a right eye image. The method according to claim 1, Wherein the liquid crystal shutter allows the polarization state of the left eye and the right eye images to pass therethrough when the liquid crystal shutter is in the OFF state and changes the polarization state of the left eye and the right eye image to the second direction in the ON state; Wherein the stereoscopic glasses include a left eye tilt having a polarization axis in a first direction and a right eye tilt having a polarization axis in a second direction. 3. The method of claim 2, Wherein a liquid crystal shutter having the optical means is attached to the surface of the image display device. 3. The method of claim 2, Wherein the liquid crystal shutter having the optical means is attached to the left eye window and the right eye window of the stereoscopic glasses, respectively. The method according to claim 1, Wherein the stereoscopic glasses further include a left and right eye shading window having a polarization axis in a first direction and the left and right eye shading windows attach the liquid crystal shutter including the optical means; When displaying the left eye image in the image display apparatus, the liquid crystal shutter of the left eye lens is in the OFF state and the liquid crystal shutter of the right eye lens is in the ON state; Wherein when the right eye image is displayed on the image display apparatus, the liquid crystal shutter of the left eye lens is in the ON state and the liquid crystal shutter of the right eye lens is in the OFF state. The method according to claim 1, Wherein the optical means has a plurality of triangle-shaped acid patterns. The method according to claim 6, Wherein the triangle image pattern has a small acute angle selected from a range of 15 DEG to 25 DEG. The method according to claim 6, And the pitch of the right triangular pattern is a value selected from the range of 30 to 70 mu m. The method according to claim 1, Wherein the liquid crystal shutter comprises: a first transparent substrate; A second transparent substrate facing the first transparent substrate; A first transparent electrode and a second transparent electrode formed on inner side surfaces of the first transparent substrate and the second transparent substrate; And a liquid crystal layer interposed between the first transparent electrode and the second transparent electrode. 10. The method of claim 9, The first transparent substrate is disposed toward the image display device; Wherein the optical means is formed by processing the surface of the first transparent substrate.

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