TWI474058B - Patterned retarder laminated composite polarizing plate and display apparatus using the same - Google Patents

Description

Patterned retarder laminated composite polarizing plate and display device using the same

The present invention relates to a patterned retarder laminated composite polarizing plate and a display device using the composite polarizing plate.

When looking at the display, the viewer is physiologically and empirically aware of the three-dimensional depth. Typically, a three-dimensional image is implemented based on binocular parallax, which is the basic principle to explain why the viewer perceives a three-dimensional depth at close range.

Using the binocular parallax, two different images are separately captured using at least two cameras for the left eye and the right eye, and the captured images are separately displayed to the left eye and the right eye. The image is then combined in the brain to give a three-dimensional depth of perception.

3D imaging technology can be divided into two categories: methods using polarized glasses and methods without using polarized glasses. Examples of techniques for using glasses include (1) a complementary color method using glasses in which the two lenses are different colors, and (2) a polarization method using glasses in which the two lenses have different polarization directions, and (3) Time-sharing method using shutter glasses synchronized with the screen update rate.

The technique of using polarized glasses requires a display device for displaying a three-dimensional image and polarized glasses for observing the displayed three-dimensional image.

Meanwhile, many three-dimensional displays using polarized glasses include a patterned retarder (a retarder pattern on a base film). The patterned retarder is laminated on one side of the polarizing plate by a permanent or pressure sensitive adhesive.

However, the patterned retarder may cause deterioration in display quality because the optical axis direction (direction of the abnormal axis) of each of the patterned regions of the patterned retarder is different from each other.

In a patterned retarder comprising a repeating arrangement of a retarder pattern, due to the difference in refractive index and transmittance ratio of the patterned retarder, a pattern of light and shadow can be detected, and when the light and shadow pattern and the backlight are diffused When a light of a pattern or a cymbal interferes with a shadow pattern or the like, a moire pattern can also be detected.

The invention provides a composite polarizing plate comprising a patterned retarder, so that the polarization of the light, the phase difference compensation of the polarized light and the image separation of the three-dimensional image can be simultaneously performed.

The present invention is also directed to providing a composite polarizing plate to improve the moiré effect due to the difference in brightness between the patterned regions in the patterned retarder and the difference in refractive index between the patterned retarder and the adhesive layer.

The invention also serves to provide a display device comprising the composite polarizing plate.

The present invention provides a composite polarizing plate comprising a patterned retarder laminated on a polarizing plate by an adhesive layer, wherein the refractive index (N) of the adhesive layer satisfies the following equation (1) ):min(n ₀ ,n _e )≦N≦max(n ₀ ,n _e ) (1) where n ₀ represents the ordinary refractive index of the patterned retarder, and n _e represents the abnormality of the patterned retarder The refractive index, min(n ₀ , n _e ) represents the smaller of n ₀ and n _e , and max(n ₀ , n _e ) represents the larger of n ₀ and n _e .

The present invention provides a composite polarizing plate comprising a patterned retarder laminated on a polarizing plate by an adhesive layer, wherein the refractive index (N) satisfies the following equation (2): min ( n ₀ ,n _e )+|n ₀ -n _e |/3≦N≦max(n ₀ ,n _e )-|n ₀ -n _e |/3 (2) where n ₀ represents the patterned retarder The usual refractive index, n _e represents the abnormal refractive index of the patterned retarder, min(n ₀ , n _e ) represents the smaller of n ₀ and n _e , and max(n ₀ , n _e ) represents The larger between n ₀ and n _e .

The present invention provides a composite polarizing plate comprising a patterned retarder, the patterned retarder is laminated on a polarizing plate by an adhesive layer, wherein the refractive index (N) satisfies the following equation (3) _{: 0.99N e ≦ N ≦ 1.01N e} (3) where _{N e = (n 0 + n} e) / 2, n 0 the refractive index representative of the usual patterned retarder, and n _e representing the pattern block The abnormal refractive index of the agent.

The present invention provides a composite polarizing plate comprising a patterned retarder, the patterned retarder is laminated on a polarizing plate by an adhesive layer, wherein the refractive index (N) satisfies the following equation (4) :0.994N _e ≦N≦1.006N _e (4) where N _e =(n ₀ +n _e )/2, n ₀ represents the normal refractive index of the patterned retarder, and n _e represents the patterned retardation The abnormal refractive index of the agent.

Composite polarizing plate according to the present invention because of patterning retarder and adhesion The moiré effect caused by the difference in refractive index between layers can be improved, which may provide a uniform three-dimensional image.

According to the composite polarizing plate of the present invention, since the patterned retarder can be directly laminated on the polarizing plate and a separate base film is not required, it is possible to provide a thin display device.

According to the composite polarizing plate of the present invention, since the difference in luminance between the patterned regions is very small, it is possible to reduce eye fatigue and dizziness caused by a difference in luminance in the image, which is perceived by the left eye and the right eye.

When the composite polarizing plate of the present invention is applied to a display process, when a patterned retarder is laminated on a polarizing plate, it may reduce the possibility that foreign matter is included between the layers.

The composite polarizing plate according to the present invention can be widely applied to many types of display devices such as a reflective or transflective liquid crystal display (LCD), a plasma display panel (PDP), an organic EL display (OLED), and the like.

10, 11, 40, 41, 60, 110, 310‧‧‧ polarizing plates

20, 21‧‧‧ patterned barrier layer

30, 31, 320‧‧‧ Blocking layer

61‧‧‧First image display area

62‧‧‧Second image display area

63, 120‧‧‧ patterned blockers

64‧‧‧First patterned area

65‧‧‧Second patterned area

70‧‧‧ Polarized glasses

71‧‧‧First polarization zone

72‧‧‧Second polarization zone

74‧‧‧ left lens

75‧‧‧right lens

130‧‧‧Adhesive layer

140‧‧‧Transparent basal layer

200‧‧‧LCD panel

240‧‧‧reflective layer

410‧‧‧Backlight unit

In the drawings: FIGS. 1 and 2 show an example of a composite polarizing plate according to the present invention; FIGS. 3 and 4 show an example of a reflective liquid crystal display including a composite polarizing plate according to the present invention; Figure 6 and Figure 6 show an example of a transflective liquid crystal display comprising a composite polarizing plate according to the present invention; Figures 7 and 8 show a plasma display panel or an organic EL display including a composite polarizing plate according to the present invention. Example; Figure 9 shows a three-dimensional image of a glasses comprising a composite polarizing plate according to the present invention. The image display system; and Fig. 10 is a diagram for explaining briefly the principle of the three-dimensional image display system in Fig. 9.

The present invention relates to a composite polarizing plate comprising a patterned retarder laminated on a polarizing plate by an adhesive layer, wherein the refractive index (N) of the adhesive layer satisfies the above equation (1)- One of (4). The three-dimensional display device including the composite polarizing plate can display a uniform three-dimensional image because the moiré can be improved due to the difference in refractive index between the patterned retardant and the adhesive layer. Since the patterned retarder can be directly laminated on the polarizing plate and a separate base film is not required, the composite polarizing plate may provide a thin display device. When a display device including a patterned retarder and a polarizing plate is prepared, the composite polarizing plate may also greatly reduce the possibility that foreign matter is included between the layers.

Hereinafter, the present invention is described in detail.

As shown in FIG. 1, the composite polarizing plate may include a polarizing plate 110, an adhesive layer 130 laminated on the polarizing plate 110, and a patterned retarder 120 laminated on the adhesive layer 130. The patterned retarder 120 can be directly coated on the polarizing plate. For example, the patterned retarder 120 may be coated on a polarizer protective film or a retardation film placed on the surface of the polarizing plate.

In addition, when physical properties, such as the strength of the patterned retarder 120, are sufficient, or the patterned retarder 120 is prepared in the process, and then it is advantageous to laminate it to the polarizing plate, the patterning resistance is The stagnation agent 120 may be formed on the transparent substrate layer 140, and then the base layer 140 on which the patterned retarder 120 is formed may be laminated on the polarizing plate.

Any polarizing plate commonly used in displays can be used as the polarizing plate in the present invention. For example, a laminate structure including a polarizer, and at least one functional film may be used as the polarizing plate of the present invention, the at least one functional film being selected from a polarizer protective film laminated on one or both sides of the polarizer and blocking A group of films. Likewise, a thin polarizing plate fabricated by forming a micropatterned conductive mesh on a transparent substrate layer and coating an insulating layer on the recesses and ridges of the conductive mesh can be used.

The type of polarizer is not limited in the present invention, and any type of polarizer that can be generally used in a display can be used. For example, a polarizer manufactured by dyeing a polyvinyl alcohol film with iodine or a dichroic dye and extending it can be used.

The adhesive layer of the present invention is used to attach a patterned retarder to one side of the polarizing plate.

In the present invention, the adhesive layer may be composed of a permanent adhesive or a pressure sensitive adhesive.

In the present invention, in the uniaxial retardation layer, the abnormal refractive index (n _e ) represents a refractive index having a direction of a different refractive index value between the refractive indices of the x, y, and z axes, and a normal refractive index ( n ₀ ) represents the refractive index of the other two directions (the refractive index of the other direction perpendicular to the direction of the abnormal refractive index).

In the biaxial retardation layer, the anomalous refractive index (n _e ) represents the maximum or minimum refractive index between the refractive indices of the x, y, and z axes, one of which is different from the other and neither the maximum refractive index nor The refractive index of the minimum refractive index has a large difference, and the ordinary refractive index (n ₀ ) represents the refractive indices of the other two directions.

As shown in the following equation (1), the refractive index (N) of the adhesive layer of the present invention is intended to be The patterning retarder has a normal refractive index (n0) and an abnormal refractive index (ne). It is used to reduce the difference in brightness between the retarder patterns and to eliminate the moiré effect.

Min(n ₀ ,n _e )=N=max(n ₀ ,n _e ) (1)

(In the above equation, n ₀ represents the ordinary refractive index of the patterned retarder, n _e represents the abnormal refractive index of the patterned retarder, and min(n ₀ , n _e ) represents n ₀ and n _e The smaller one, and max(n ₀ , n _e ) represents the larger between n ₀ and n _e ).

Further, in the present invention, in order to reduce the difference in luminance between the retarder patterns and to eliminate the moiré effect, it is desirable that the refractive index (N) of the adhesive layer is within the range described in the following equation (2). The equation (2) shows that when the difference between the ordinary refractive index and the abnormal refractive index is divided into three equal parts, if the refractive index (N) is in the arithmetic mean of including the ordinary refractive index and the abnormal refractive index Within the portion of the number, it is more effective to reduce the difference in brightness between the retarder patterns and eliminate the moiré pattern.

(In the above equation, n ₀ represents the ordinary refractive index of the patterned retarder, n _e represents the abnormal refractive index of the patterned retarder, and min(n ₀ , n _e ) represents n ₀ and n _e The smaller one, and max(n ₀ , n _e ) represent the larger of n ₀ and n _e .)

Further, in the present invention, in order to reduce the difference in luminance between the retarder patterns and to eliminate the moiré pattern, it is more desirable that the refractive index (N) of the adhesive layer is within the range described in the following equation (3). The equation (3) shows that when the refractive index (N) of the adhesive layer and the difference between the ordinary refractive index and the arithmetic mean of the abnormal refractive index are less than 1%, the pattern between the retarder patterns is reduced. It is more effective to have a difference in brightness and eliminate the moiré pattern.

_{0.99N e = N = 1.01N e (} 3)

(In the above equation, N _e = (n ₀ + n _e )/2, n ₀ represents the ordinary refractive index of the patterned retarder, and n _e represents the abnormal refractive index of the patterned retarder.)

Further, in the present invention, in order to reduce the difference in luminance between the retarder patterns and to eliminate the moiré pattern, it is more desirable that the refractive index (N) of the adhesive layer is within the range described in the following equation (4). The equation (4) shows that when the refractive index (N) of the adhesive layer and the difference between the ordinary refractive index and the arithmetic mean of the abnormal refractive index are less than 0.6%, the pattern between the retarder patterns is reduced. It is more effective to have a difference in brightness and eliminate the moiré pattern.

0.994N _e =N=1.006N _e (4)

(In the above equation, N _e = (n ₀ + n _e )/2, n ₀ represents the ordinary refractive index of the patterned retarder, and n _e represents the abnormal refractive index of the patterned retarder.)

It is assumed that the two layers have different refractive indices (first medium and second medium). When light passes through the edges of the two layers, the refractive index of light incident perpendicularly from the first medium to the second medium is R = ((n _{2 -} n ₁ ) / (n ₂ + n ₁ )) ² ( In the equation, n ₁ is the refractive index of the first medium, and n ₂ is the refractive index of the second medium.

Assuming that the adhesive layer is the first medium, and the patterned retarder is the second medium, when the polarization direction of the incident light is in the direction of the abnormal refractive index, n ₂ =n _e and R _e =((n _e -n ₁ ) / (n _e + n ₁ )) ² , and when the direction of the polarization of the incident light is in the direction of the normal refractive index, n ₂ = n _o and R _o = ((n _{o -} n ₁ ) / (n _o +n ₁ )) ² .

At the same time, the abnormal axes of the two patterned regions (the first patterned region and the second patterned region) of the patterned retarder are arranged to be perpendicular to each other, so when the incident light is parallel to the anomalous axis of the first patterned region The incident light is perpendicular to the anomalous axis of the second patterned region. Therefore, the reflection values of the first patterned region and the second patterned region are R _e =((n _e -n ₁ )/(n _e +n ₁ )) ² and R _o =((n _o - n ₁ )/(n _o +n ₁ )) ² .

If n ₁ is not between n _e and n _o , the difference between R _e and R _o becomes large, and severe luminance decay occurs due to the attenuation of the transmittance of the patterned retarder. However, if n _{1 is} between n _e and n _o , the difference between R _e and R _o becomes small, and the overall transmittance does not change rapidly, due to the attenuation of the patterned retarder transmittance The brightness decay is not serious.

As described above, when the refractive index of the adhesive layer of the present invention satisfies the equation (1), the difference in luminance between the retarder patterns can be reduced, and the moiré effect can be eliminated. Further, the refractive index of the present invention satisfies the equations (2), (3), and (4), and becomes closer to the value of Ne, which is the ordinary refractive index and the arithmetic mean of the abnormal refractive index, and the above effects Become more effective.

Preferably, the direction of polarization of the incident light to the patterned retarder is maintained between the anomalous axes of the two patterned regions of the patterned retarder (the first patterned region and the second patterned region), And the refractive index of the adhesive layer is in the above range. Further, it is preferable that the biasing direction is closer to the middle of the two abnormal axes (the direction of the angle between the two abnormal axes).

For example, when the optical axis (abnormal axis) of the first patterned region is x (0°) and the optical axis (abnormal axis) of the second patterned region is y (90°), the light is incident perpendicularly from the adhesive layer. The direction of polarization of the light to the patterned retarder is desirably between 0 and 90, and more desirably closer to 45, for example between 22.5 and 67.5.

The polarization direction as configured above can suppress reflection between the patterned regions in the patterned retarder and reflection between the patterned retarder and the adhesive layer. The reasons are as follows.

When light having an arbitrary polarization direction enters the patterned retarder, by dividing the light into two electric field components, E _e1 and E _o1 , and summing two reflectances calculated from E _e1 and E _o1 , respectively The reflectance of the light incident on the first patterned region is calculated. The reflectance of light incident on the second patterned region is calculated by splitting the light into two electric field components, E _e2 and E _o2 , and summing the two reflectances calculated from E _e2 and E _o2 , respectively.

For example, when n _e and n _{o of} the first patterned region are approximately the same as n _e and n _o (n _e1 =n _e2 , n _o1 =n _o2 ) of the second patterned region, and only the abnormal axes are different from each other When n _e -n ₁ is different from n _o -n ₁ unless n ₁ =(n _e +n ₀ )/2. The intensity of the reflected light can be expressed as E _i ² × R _i = Ee _i ² × R _e + E _oi ² × R _o (here, E _ei and E _oi represent the anomalous axes in the first and second patterned regions And the electric field strength in the direction of the normal axis). In this case, when light enters the first or second patterned region, the electric field component of light having an optical axis closer to the direction of the electric field vector has a higher intensity.

In this case, since the R _e between the first and second patterned regions becomes different, a difference occurs between the overall reflectances of each of the patterned regions. Therefore, the brightness is different for each patterned area. Furthermore, errors in the polarization of light can occur due to the difference in reflectivity between each of the patterned regions. Therefore, in the present invention, the polarization direction that has been incident on the patterned retarder is configured not in the direction of the anomalous axis of each patterned region, but in the two patterned regions of the patterned retarder Between the anomalous axes, and more desirably in the direction closer to the middle of the two anomalous axes, to reduce reflections in each of the patterned regions.

As described above, if the refractive index satisfies any one of the equations (1) to (4), and the polarization direction incident on the patterned retarder is in the two patterning of the patterned retarder It is most effective to reduce the difference in brightness between the retarder patterns and eliminate the moiré effect between the anomalous axes of the regions.

The patterned retarders of the present invention comprise a uniaxial patterned retarder and a biaxial patterned retarder. The above relationship between the abnormal refractive index and the ordinary refractive index in the uniaxially patterned retarder can be similarly applied to the maximum refractive index and the maximum of the biaxially patterned retarder. The relationship between small refractive indices.

In the present invention, the front retardation (R _e ) is intended to be between 0 and 10 nm. When the front retardation is more than 10 nm, light leakage or deterioration of picture quality may occur in the display because the phase difference between the light that has passed through the first and the second patterned regions is unnecessarily larger than desired. .

For example, in the example of a three-dimensional display, the phase of the linearly polarized light passing through the patterned retarder is respectively shifted by ±λ/4 to be converted into a right-handed circular polarization by the first or second patterned region. Or left-handed circular polarization. However, when a front block of more than 10 nm is applied to each of the converted lights, light leakage or picture quality deterioration occurs because the polarization is converted into elliptical polarization instead of circular polarization.

In the present invention, it is desirable to use an adhesive layer having no front retardation while maintaining the above refractive index range. However, considering the use of permanent or non-permanent adhesives and processes, it is desirable to use permanent or non-permanent adhesives that can cause a minimal impact on the front retardation and the retardation of the patterned retarder and the polarizer.

In the present invention, a UV hardened permanent adhesive or a UV hardened non-permanent adhesive can be used as the adhesive layer. The UV hardened permanent adhesive or UV hardened non-permanent adhesive is often used in the field of the invention and is not limited to any particular type.

For example, the adhesive layer may comprise an acrylic acid copolymer, a natural rubber, a styrene-isoprene-styrene block copolymer, a styrene-butadiene-styrene block copolymer, a styrene-vinyl butyl group. a group consisting of an olefin-styrene block copolymer, a styrene-butadiene rubber, a polybutadiene, a polyisoprene, a polyisobutylene, a butyl rubber, a chloropyrene rubber, and a silicone rubber. One.

The method for forming a patterned retarder is not limited in the present invention and can be Use any method that is commonly used. An example of this method is to align liquid crystals on a polymer film and form a pattern using photoresist.

The method is often carried out by forming a alignment layer, a buffing, a photoresist treatment, a buffing photoresist strip, a liquid crystal coating, and hardening by coating a solution on a transparent substrate layer.

A non-birefringent material or a low birefringent material may be used as the transparent base layer. For example, glass, acrylic, or non-extensible polycarbonate can be used, and the like.

The straight layer of the school is used to straighten the liquid crystal, and the commonly used polishing polymer can be used for the straight layer.

The coating method is not limited to any particular method, and any commonly used method that can form a uniform coating can be used. Specifically, spin coating, wire bar coating, micro gravure coating, dip coating, or spray coating method can be used.

After drying, the thickness of the straight layer is intended to be between 800 and 200 Å. When the thickness is less than 800 Å, it does not have sufficient alignment adjustment force, and when the thickness is more than 2000 Å, it is difficult to have uniformity of coating when the alignment is straight.

Next, a straightening direction is formed on the straight layer by polishing.

Next, a main film is placed on the photoresist, and the photoresist is exposed and formed with the black portion of the main film as a mask. Then, a portion of the photoresist corresponding to the black portion remains. Here, the width and distance between the remaining photoresists differ depending on the pixel pitch of the panel (for example, LCD and PDP) to which the patterned layer is applied.

Next, the remaining photoresist is used as a mask for polishing. A portion of the straight layer protected by the photoresist maintains the original alignment direction without being changed to another alignment direction by the other portion of the photoresist protection. After completing the second buffing, used as The photoresist of the mask is removed by immersion in an etching solution.

Next, the patterned retarder is completed by coating and hardening the liquid crystal.

The patterned retarder laminated on the transparent substrate layer includes a first hardened liquid crystal layer having a first alignment direction and a second hardened liquid crystal layer having a second alignment direction. The first and second alignment directions are the directions of the anomalous axes, so the light passing through the first and second patterned regions has a phase difference.

The composite polarizing plate according to the present invention may include a transparent substrate layer laminated on the patterned retarder. The transparent substrate layer protects the surface of the patterned retarder.

As described above, when the patterned retarder is fabricated, when the transparent substrate layer is used, the transparent substrate layer may be a base film or a sheet for forming the patterned retardant, and may also be in the pattern The top of the retarder is used to protect the protective film of the patterned retarder. Furthermore, the transparent substrate layer, such as the strength of the patterned retarder, can be removed, taking into account the necessary conditions, and the like.

The composite polarizing plate may additionally include one or more functional layers laminated on the patterned retarder, the functional layer being selected from a permanent adhesive layer or a non-permanent adhesive layer, a protective layer, a retardation layer, and an anti-glare layer. a group consisting of an antireflection layer, an antistatic layer, and a hard coat layer.

The permanent or non-permanent adhesive layer is used to adhere to other functional layers. The protective layer is a layer for preventing cracking or damage of the polarizing plate or the patterned retarder. This retardation layer is used to additionally control the block. The anti-glare layer is a layer having micro-roughness formed by sandblasting, embossing, or spraying a solution containing particles. The anti-reflection layer is for preventing the attenuation of visibility due to reflection of external light, and the anti-reflection layer includes a metal oxide formed by deposition or sputtering. The antistatic layer is for preventing dust due to static electricity, and is formed of a UV hardening polymer including an antistatic material. The hard coat layer is for preventing the surface of the polarizing plate Rupture or damage, and formed by acrylic or silicone UV-curable polymers.

The composite polarizing plate including a polarizing plate and a patterned retarder according to the present invention may be included in a display device.

Any display device capable of displaying a three-dimensional image may be the above display device. For example, the display device may include a reflective or transflective liquid crystal display (LCD), a plasma display panel (PDP), an organic EL display (OLED), and the like.

The composite polarizing plate according to the present invention can use a polarizing plate as a prior art and a substitute for a patterned retarder.

For example, the reflective liquid crystal display as shown in FIG. 3 may include a backlight unit 410; a low polarizing plate 310 that converts light emitted from the backlight unit into polarized light; a liquid crystal panel 200 into which the polarized light enters; The upper polarizing plate 110 that has passed the information of the light of the liquid crystal panel; converts the light that has passed through the upper polarizing plate 110 into two patterned retarders 120 of different polarized lights according to the pattern.

Figure 4 depicts an example in which the display device shown in Figure 3 further includes a transparent substrate layer 140 at the outermost layer.

Further, for example, the reflective liquid crystal display as shown in FIG. 5 may include a backlight unit 410; a lower polarizing plate 310 that converts light emitted from the backlight unit into polarized light; and a retardation of shifting the phase of the polarized light The layer 320 receives the signal, provides information according to the received signal to the phase-shifted polarized light, reflects the reflective layer 240 of the light that has passed through the liquid crystal display panel, and detects the light that has passed through the liquid crystal panel. The upper polarizing plate 110 of the information; converts the light that has passed through the upper polarizing plate 110 into two patterned retarders 120 of different polarized lights according to the pattern. In this case, the reflected polarized light passes through the liquid crystal display panel while maintaining the same phase difference.

Fig. 6 depicts an example in which the display device shown in Fig. 5 further includes a transparent substrate layer 140 at the outermost layer.

Further, the composite polarizing plate according to the present invention can be applied to a plasma display panel (PDP) or an organic EL display (OLED) shown in FIG. 7, and the composite polarizing plate can additionally include a transparent base layer on the outermost layer. 140.

The principle of implementing a three-dimensional image in a display device including the composite polarizing plate according to the present invention is the same as the prior art using a conventional polarizing plate and a patterned retarder.

The composite polarizing plate can be applied to a three-dimensional image display system according to the present invention. As shown in FIG. 9, the system can include a liquid crystal display and a pair of polarized glasses 70. The liquid crystal display includes a polarizing plate 60 having a first image display area 61 and a second image display area 62, and a patterned retarder 63 having a first patterned area 64 and a second patterned area 65, the first pattern The region 64 transforms the polarization of light that has passed through the first image display region 61, and the second patterned region 65 transforms the polarization of light that has passed through the second image display region 62. The secondary polarized glasses include a first polarized region 71 and a second polarized region 72 that convert polarization of light that has passed through the patterned retarder into linear polarization, and left and right lenses. 74 and 75.

Figure 10 depicts the principle of implementing a three-dimensional image using the system shown in Figure 9. When passing through the polarizing plates 10 and 11, the white light emitted from the light source is converted into linearly polarized light, and when passing through the patterned retardation layers 20 and 21 of the liquid crystal display, the linearly polarized light is Turned into a circular polarized light. The circularly polarized light is allowed to pass through or be blocked by the retardation layers 30 and 31 and the polarizing plates 40 and 41 of the sub-polarized glasses.

The invention may be understood by the following examples, which are merely exemplary and not limiting the scope of the invention, which is defined by the scope of the appended claims.

Examples and comparative examples

As shown in Fig. 1, a composite polarizing plate comprising a polarizing plate 110, an adhesive layer 130 having an acrylic copolymer, and a patterned retarder 120 (Zeon, COP) was stacked and stacked in this order. The size of the composite polarizing plate was 10 cm * 10 cm, and the abnormal refractive index (n _e ) and the ordinary refractive index (n _o ) of the patterned retarder are shown in Tables 1 to 3.

Tables 1 to 3 are reflectances with respect to the refractive index of the adhesive layer in consideration of the abnormal refractive index (n _e ) of the patterned retarder and the ordinary refractive index (n _o ). For your reference, in Table 1, the difference between reflectances |R _o -R _e | can be regarded as the difference between the penetration (brightness) ratio |T _o -T _e |, since R _e =1-T _e , and R _o =1-T _o .

Tables 4 to 6 are test results of the visibility of the liquid crystal display including the composite polarizing plate having the properties shown in Tables 1 to 3. This test is performed by an expert in testing LCD visibility. The visibility of an example or comparative example is compared to other examples or comparative examples in the same table.

◎: Very good ○: Good △: Improvement X: Poor

As shown in Tables 4 to 6, it was confirmed that when the refractive index (N) of the adhesive layer of the present invention is between the ordinary refractive index (n ₀ ) of the patterned retarder and the abnormal refractive index (n _e ), The moiré pattern is eliminated and the visibility test results are excellent.

Furthermore, the results show that when the refractive index of the adhesive layer is closer to the value of N _e (the arithmetic mean of the normal and abnormal refractive index of the refractive index), the visibility becomes good results. In particular, the best results are obtained when the refractive index of the adhesive layer and the difference between the ordinary refractive index and the arithmetic mean (N _e ) of the abnormal refractive index are less than 1%.

60‧‧‧Polar plate

61‧‧‧First image display area

62‧‧‧Second image display area

63‧‧‧Phase blockers

64‧‧‧First patterned area

65‧‧‧Second patterned area

70‧‧‧ Polarized glasses

71‧‧‧First polarization zone

72‧‧‧Second polarization zone

74‧‧‧ left lens

75‧‧‧right lens

Claims (12)

A three-dimensional display device comprising: a composite polarizing plate comprising a patterned retardation film laminated on a polarizing plate by an adhesive layer, wherein a polarization direction of light that has entered the patterned retardation film Between the abnormal axis directions of the two patterned regions of the patterned retardation film, wherein a refractive index (N) of the adhesive layer satisfies the following equation (2): min(n ₀ , n _e )+| n ₀ -n _e |/3=N=max(n ₀ ,n _e )-|n ₀ -n _e |/3 (2); wherein n ₀ represents a normal refractive index of the patterned retardation film, n _e represents an abnormal refractive index of the patterned retardation film, min(n ₀ , n _e ) represents the smaller of n ₀ and n _e , and max(n ₀ , n _e ) represents n ₀ and n The larger between _e . The three-dimensional display device according to claim 1, wherein the refractive index (N) satisfies the following equation (3): 0.99N _e ≦N≦1.01N _e (3) wherein N _e =(n ₀ + n _e )/2, n ₀ represents a normal refractive index of the patterned retardation film, and n _e represents an abnormal refractive index of the patterned retardation film. The three-dimensional display device of claim 1, wherein the refractive index (N) satisfies the following equation (4): 0.994 N _e ≦ N ≦ 1.006N _e (4) wherein N _e = (n ₀ + n _e )/2, n ₀ represents a normal refractive index of the patterned retardation film, and n _e represents an abnormal refractive index of the patterned retardation film. The three-dimensional display device according to any one of claims 1-3, further comprising a transparent substrate layer laminated on the patterned retardation film. The three-dimensional display device of any one of claims 1-3, wherein the adhesive layer is a permanent adhesive layer or a pressure sensitive adhesive layer. The three-dimensional display device according to any one of claims 1-3, wherein a front retardation (R _e ) of the adhesive layer is between 0 and 10 nm. The three-dimensional display device of any one of claims 1-3, wherein the adhesive layer comprises a UV-cured permanent adhesive film or a UV-cured pressure-sensitive adhesive film. The three-dimensional display device according to any one of claims 1 to 3, wherein the adhesive layer comprises an acrylic copolymer, a natural rubber, a styrene-isoprene-styrene block copolymer, and a benzene. Ethylene-butadiene-styrene block copolymer, styrene-ethylene butylene-styrene block copolymer, styrene-butadiene rubber, polybutadiene, polyisoprene, polyisobutylene, butyl At least one of a group consisting of a base rubber, a chlorine rubber, and a silicone rubber. The three-dimensional display device according to any one of claims 1-3, wherein a direction of an abnormal axis of a patterned region of the patterned retardation film is different from other patterns of the patterned retardation film The anomalous axis direction of the region. The three-dimensional display device according to any one of claims 1 to 3, wherein one or more functional layers are laminated on the patterned retardation film, the functional layer being selected from a permanent adhesive layer or pressure sensitive A group consisting of an adhesive layer, a protective layer, a retardation layer, an antiglare layer, an antireflection layer, an antistatic layer, and a hard coat layer. The three-dimensional display device according to any one of claims 1 to 3, wherein the polarizing plate is a laminated structure including a polarizer, and at least one of the functional films is selected from the layered in the polarized light. A group of polarizer protective films and a retardation film on one or both sides of the mirror. The three-dimensional display device according to any one of claims 1-3, wherein the three-dimensional display device is a liquid crystal display, a plasma display or an organic EL display.