KR20180071593A - 3d image display device - Google Patents

Abstract

The present invention relates to a three-dimensional image display device. More specifically, the three-dimensional image display device includes a first screen display unit, a second screen display unit, and a reflective polarized film stacked between the first and second screen display units. The first screen display unit and the second screen display unit are disposed to have 45 to 135 degrees. A polarization direction of light emitted from the first screen display unit and a polarization direction of light emitted from the second screen display unit are perpendicular to each other. The polarization direction of the light emitted from the second screen display unit and a direction of reflected light of the reflective polarized film are parallel to each other. Therefore, the three-dimensional image display device can express an instrument board in a clear three-dimensional way.

Description

TECHNICAL FIELD [0001] The present invention relates to a 3D image display device,

The present invention relates to a stereoscopic image apparatus capable of displaying a clear instrument panel in three dimensions.

The display market environment, which focused on improving the image quality of the flat image in the past, is gradually evolving rapidly with the application of 3D stereoscopic image, in order to keep pace with the rapidly developing display technology and increasingly advanced display technology.

In the field of automobiles, various advanced display devices including clusters of navigation and instrument panels are provided in the interior of a vehicle as advanced and advanced technologies are integrated with IT technology. As a result, It is increasingly necessary to satisfy customer expectations and improve emotional quality by actively applying new functions and display devices provided in general electronic products in accordance with the requirements of the present invention.

The vehicle's instrument is located on the front of the driver's seat and allows the driver to visually recognize the number of revolutions of the engine or the running speed of the vehicle, which is information about the vehicle's running. At night, Although indirect identification of light is facilitated by indirect lighting, the dial of the instrument is expressed in two dimensions in a plane, and it has a monotonous feeling.

Therefore, various attempts have been made to express the dial of the instrument more vividly.

For example, in Korean Patent Registration No. 879,130, an identification section formed on a light transmitting panel is configured to have a depth feeling by light emitted through a light transmitting section, and an instrument panel configured to have a stereoscopic effect by an optical illusion phenomenon. However, this method has a disadvantage in that it is impossible to change the image and the three-dimensional effect is not clear because the stereoscopic effect is realized by the special illumination after printing schemes or characters on the transparent panel.

For example, Korean Patent Laid-Open Publication No. 2006-112019 discloses a method in which a halftone dot is progressively formed with an opaque black ink on the entire face of a background of a dial so that a certain amount of light can be projected between halftone dots, The back side is a translucent white ink which forms a halftone dot like the front side but forms a black halftone dot somewhat larger than the incandescent scale and numbers. The front side and the back side are printed The silk screen mesh is formed by overlapping the halftone dots formed by crossing about 30 to 35 degrees relative to each other so that light incident from the light source is scattered while being projected onto the front face of the dial so that the portion near the axis around the fixed axis of the dial is bright It gradually darkens or brightens toward the outer edge where the symbol or letter is displayed, While one person had to make three-dimensional.

However, the above-described configuration has the problem that the sharpness of the instrument panel can be improved, but it is insufficient to realize the three-dimensional feeling.

An object of the present invention is to provide a stereoscopic image apparatus capable of realizing an improved stereoscopic effect simultaneously with the clarity of an instrument panel.

The present invention provides a display device including a first screen display unit; A second screen display unit; And a reflection type polarizing film laminated between the first screen display part and the second screen display part, wherein the first screen display part and the second screen display part are arranged to have 45 to 135 degrees, Wherein the polarizing direction of the light and the polarizing direction of the light emitted from the second screen display section are perpendicular to each other and the polarizing direction of the light emitted from the second screen display section and the direction of the reflected light of the reflective polarizing film are parallel to each other Display device.

Since the stereoscopic image display device according to the present invention uses a reflection type polarizing film, it can be realized at a high luminance while lowering the power loss compared to the case of using a conventional semi-transmission type mirror, There is an advantage that a clear stereoscopic image can be realized.

FIG. 1 shows a stereoscopic image display device according to a first embodiment of the present invention,
FIG. 2 shows a stereoscopic image display device according to a third embodiment of the present invention,
3 illustrates a stereoscopic image display device according to a fourth embodiment of the present invention,
4 shows an actual image obtained from the stereoscopic image display apparatus according to the first embodiment of the present invention,
FIG. 5 is a schematic view for explaining the expression of? And? In the coordinate system of the present invention,
6 is a graph showing the change in polarization state before the compensation according to the third embodiment of the present invention in a pouinc curry in the direction of an oblique angle (? = 270 degrees,? = 40 degrees).
Fig. 7 is a graph showing a change in polarization state according to Example 3 of the present invention in a pouinc curry in the direction of an oblique angle (? = 270 占,? = 40 占.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image apparatus capable of displaying an instrument panel in a clear three-dimensional manner.

Hereinafter, the present invention will be described in detail.

1, the stereoscopic image display apparatus according to the present invention includes a first screen display unit 10; A second screen display unit 20; And a reflection type polarizing film (30) laminated between the first screen display part and the second screen display part.

The first screen display unit 10 and the second screen display unit 20 are arranged to have an angle of 45 to 135 degrees and the direction of polarization of the light emitted from the first screen display unit 10 and the direction of polarization of the light emitted from the second screen display unit 20 The polarizing direction of the emitted light is perpendicular to each other, and the polarizing direction of the light emitted from the second screen display unit 20 and the reflected light of the reflective polarizing film 30 are parallel to each other.

Specifically, the polarizing direction of the light emitted from the first screen display unit 10 is 90 °, the polarizing direction of the light emitted from the second screen display unit 20 is 0 °, and the reflection of the reflective polarizing film 30 The direction of the light to be emitted may be 0 [deg.].

The polarizing direction of the light emitted from the first screen display unit 10 is 0 ° and the polarizing direction of the light emitted from the second screen display unit 20 is 90 °. The direction of light may be 90 °.

Conventional stereoscopic images are classified into a stereoscopic display method in which spectacles are worn and a multi-view autostereoscopic method in which glasses are not required to be worn. In the stereoscopic display system, there are a pattern retractor system for dividing a space and a liquid crystal shutter system for dividing time. In the multi-point autostereoscopic system, there are a parallax barrier system and a lenticular lens system, It is divided into a method using sheets. Other methods of displaying stereoscopic images include a light field-based autostereoscopic display method and a holographic display method.

The stereoscopic image apparatus according to the present invention can display the same image through the first screen display unit 10, the second screen display unit 20, and the reflective polarizing film 30 stacked therebetween, The observer perceives a continuous depth sense according to the brightness ratio of the overlapping portion when observing the two overlapping images and consequently the principle that the two panels recognize the existence of the three-dimensional image within the enclosing volume Respectively.

The first screen display unit and the second screen display unit are generally used in the art, and for example, an LCD, an OLED, or the like can be used, and an LCD is preferable considering price competitiveness. The present invention is described in the context that the first screen display unit and the second screen display unit are each an LCD, but the present invention is not limited thereto.

When the first and second screen display portions are LCD, the polarizing direction of the light emitted from each screen display portion is similar to the absorption axis of the LCD polarizer. Therefore, the polarizer absorption axis of the first LCD display portion and the second LCD display portion is And the polarization direction of the reflected light of the reflection type polarizing film is perpendicular to the polarizer absorption axis of the second LCD screen display portion.

When the first screen display unit and the second screen display unit are LCD, the polarization direction of light emitted from each screen display unit is perpendicular to each other, and the reflection type polarizing film reflects the polarized light emitted from the second LCD screen display unit The axis is determined.

The reflective polarizer reflects the linearly polarized light in a specific direction along the direction of its axis and transmits the remaining polarized light. The reflective polarizing film is, for example, DBEF (manufactured by 3M) Dual Brightness Enhancement Film), and APF (Advanced Polarizer Film).

In this case, when the driver wears sunglasses designed to absorb polarized light in a certain direction, the driver recognizes the image quality in which the image of the instrument panel is not visible or seriously degraded . Therefore, in the case of an automobile display in which a driver views sunglasses, particularly sunglasses making sunglasses, frequently, it is required to use a circularly polarized light which can prevent such sunglasses.

As shown in Fig. 2, the light emitted from the stereoscopic image device has circular polarized light. Two? / 4 retardation layers are arranged between the second screen display part and the reflective polarizing film, and the first? / 4 retardation Layer is bonded to the second screen display portion, and the second? / 4 retardation layer is bonded to the reflective polarizing film.

At this time, the slow axis of the first? / 4 retardation layer is bonded to the absorption axis of the second screen display polarizer so that the slow axis is at 45 or 135 degrees, and the slow axis of the second? / 4 retardation layer is conjugated to the polarization direction of the reflective polarizing film Or 45 DEG to 63 DEG or 117 DEG to 135 DEG. The joining angle is a range in which the stereoscopic image can be realized in consideration of the refractive index ratio of the? / 4 phase difference layer when the angle of incidence between the normal line of the reflective polarizing film and the time (eye) is 0 to 70 degrees .

The? / 4 retardation layer is generally used in the art and is not particularly limited. For example, the retardation layer may be formed by an oblique stretching method, a liquid crystal coating method using an orientation film, or the like.

The bonding is not particularly limited to a method commonly used in the art, and examples thereof include an isocyanate based point / adhesive, a polyvinyl alcohol based point / adhesive, a gelatin based point / adhesive, a vinyl based latex based, a water based polyurethane, / RTI > < RTI ID = 0.0 > and / or < / RTI >

The principle of forming circularly polarized light using the stereoscopic image device configuration of FIG. 2 is as follows. The linearly polarized light emitted from the light source of the first screen display portion becomes circularly polarized light after passing through the reflective polarizing film and the second? / 4 retardation layer, and the linearly polarized light emitted from the light source of the second screen display portion becomes the first? / 4 When the circularly polarized light passes through the second? / 4 retardation layer, it becomes linearly polarized light in the same direction as that of the light source of the second screen display, and the direction of the linearly polarized light is changed in the reflective polarizing film And when it passes again through the second? / 4 retardation layer, it becomes circularly polarized light. At this time, the circularly polarized lights of the first and second screen display parts finally visible to the eyes of the observer have different directions. In this case, even if the observer wears sunglasses to produce linearly polarized light, excellent image quality can be displayed.

In general, when the absorption axis of the polarizer and the slow axis of the? / 4 phase difference layer are bonded at an angle of 45 ° or 135 °, the linearly polarized light is converted into circularly polarized light. However, the circularly polarized light is recognized as elliptically polarized light depending on the position of the eye, and thus a sharp stereoscopic image can not be recognized. Therefore, it is desirable to design so as to calculate and join the optimum joining angle according to the position of the eyes.

The absolute value of the ratio of the in-plane retardation value (RO) of the second? / 4 retardation layer to that of the first? / 4 retardation layer (RO / first? / 4 retardation layer Of RO |) is preferably less than 1.17. Since the first λ / 4 phase difference layer and the second λ / 4 phase difference layer may have refractive index ratios (NZ) ranging from 1 to 1.8 depending on the difference in the raw materials and the manufacturing process, the difference between the in-plane retardation values It is possible to make it closer to circularly polarized light.

At this time, the refractive index ratio NZ can be defined by the following equation (1).

[Equation 1]

NZ = (Nx - Nz) / (Nx - Ny)

(Where Nx and Ny are surface refractive indices Nx > = Ny, Nz is refractive index in the thickness direction of the film, and R0 is a front retardation value which is a substantial retardation when light passes through the normal direction of the film)

The limitation of the junction angle between the first lambda / 4 retardation layer and the second lambda / 4 retardation layer and the numerical limitation of the in-plane retardation value (RO) are for recognizing excellent image quality and a clear stereoscopic effect. That is, since the eye forms a specific angle with the reflection type polarizing film, it is necessary to correct a certain value in order to recognize a clear stereoscopic effect. Such a correction factor is required to satisfy the relationship of the incidence angle of the eye, the junction angle according to the NZ value of the? / 4 retardation layer, Plane retardation value (RO).

The effect of the compensation of the present invention can be understood by showing the change in polarization state when passing through each optical layer on the Pouinc curry sphere.

Since a puang curle sphere is a very useful method for expressing a change in polarization state at a specific time, a device for displaying an image using polarization exhibits a change in polarization state when light traveling at a specific time passes through each optical element inside the display device .

The specific angle of view of the present invention is represented by Φ = 270 ° and θ = 40 ° in the semicircle coordinate system shown in FIG. 5 and the change in the polarization state of the light coming out in this direction is expressed in a pouincere diagram for the light having a wavelength of 590 nm, Lt; / RTI >

FIG. 6 shows polarization states to be realized by the display apparatus according to the present invention at the time of? = 270 ° and? = 40 °. Specifically, the change in the polarization state with respect to the light emerging in the front direction when the surface in the direction of? With respect to the? + 90 占 direction from the front is rotated by? To the viewer side is shown on the Pujiang curry. When the coordinates of the S3 axis indicate positive (+) polarity, the right circularly polarized light is expressed as Ex, and the polarized light component as Ey. Is slower than phase 0 and less than half the wavelength. That is, when a retardation film having an RZ value of 147.5 nm corresponding to an NZ value of 1.4 and 1/4 of a wavelength of 590 nm is used, if the joining angle is 45 °, the linearly polarized light originating from S1 is accurately reflected on the -S3- It does not reach exactly and becomes elliptically polarized.

FIG. 7 shows that when the RO value corresponding to the correction factor at the time of? = 270 ° and? = 40 ° is 149 nm and the junction angle is 49.5 °, it exactly reaches the -S3 axis and becomes circularly polarized light.

As described above, in order to obtain the circularly polarized light, it is necessary to correct the RO value and the joining angle, so that excellent image quality can be obtained when the driver wears sunglasses.

FIG. 3 illustrates a configuration of a stereoscopic image apparatus according to the position of an eye, in which two? / 4 retardation layers are arranged between the first screen display and the reflective polarizing film, and the third? And the fourth lambda / 4 retardation layer is bonded to the reflection type polarizing film.

The principle of forming the circularly polarized light using the stereoscopic image device configuration of FIG. 3 is as follows. The linearly polarized light emitted from the light source of the second screen display portion becomes circularly polarized light after passing through the reflection type polarizing film and the fourth? / 4 retardation layer, and the linearly polarized light emitted from the light source of the first screen display portion becomes the third? / 4 When the circularly polarized light passes through the fourth lambda / 4 retardation layer, it becomes linearly polarized light in the same direction as that of the light source of the first screen display portion, and in the reflective polarizing film, the direction of the linearly polarized light becomes When it is reflected unchanged and passes again through the fourth? / 4 retardation layer, it becomes circularly polarized light. At this time, the circularly polarized lights of the first and second screen display parts finally visible to the eyes of the observer have different directions. In this case, even if the observer wears sunglasses to produce linearly polarized light, excellent image quality can be displayed.

At this time, the slow axis of the third? / 4 retardation layer is bonded to the absorption axis of the second screen display polarizer at 45 or 135 degrees, and the slow axis of the fourth? / 4 retardation layer is bonded to the polarization direction of the reflective polarizing film Or 45 DEG to 63 DEG or 117 DEG to 135 DEG.

Also, the absolute value of the ratio of the in-plane retardation value (RO) of the fourth? / 4 retardation layer to the third? / 4 retardation layer (the refractive index of the RO / fourth? / 4 retardation layer Is preferably less than 1.17.

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 present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Example  One

As shown in FIG. 1, a second LCD screen display unit having an absorption axis direction of 90 ° of a first LCD screen display unit and an upper polarizer plate with an absorption axis direction of 0 ° of the upper polarizer, a second LCD screen display unit, And a reflection type polarizing film (3M, APF film) was disposed at a position 45 degrees from the second LCD screen display portion.

The polarizing direction of the light emitted from the first LCD screen display unit is 90 °, the polarizing direction of the light emitted from the second LCD screen display unit is 0 °, and the direction of the reflected light of the reflective polarizing film is 0 ° .

4 shows an actual image obtained from the stereoscopic image display apparatus.

Example  2

A second LCD screen display unit having an absorption axis direction of 0 ° between the first LCD screen display unit and the upper polarizer plate with an absorption axis direction of 90 ° of the upper polarizer, A reflective polarizing film (3M, APF film) was disposed at a position between the two LCD screen display portions and at a position 45 degrees from the second LCD screen display portion.

The polarizing direction of the light emitted from the first LCD screen display unit is 0 °, the polarizing direction of the light emitted from the second LCD screen display unit is 90 °, and the direction of the reflected light of the reflection type polarizing film is 90 ° .

Example  3

2, the polarizing direction of the first LCD display unit and the second LCD screen is maintained at 90 degrees, and the angle between the first LCD display unit and the second LCD display unit is 45 degrees Reflection type polarizing film (3M, APF film) was arranged at the position. The polarization direction of the light emitted from the first screen display unit is 90 °, the polarization direction of the light emitted from the second screen display unit is 0 °, and the direction of the reflected light of the reflection type polarizing film is 0 °.

And a second lambda / 4 retardation layer and a second lambda / 4 retardation layer are bonded to the second LCD screen display portion and the reflection type polarizing film, respectively, The bonded surfaces were bonded so as to face each other.

When bonded, the angle (T1) between the slow axis of the first lambda / 4 retardation layer and the absorption axis of the second screen polarizer is 45 °, and the slow axis of the second lambda / 4 retardation layer and the reflective axis The angle (T2) formed by the polarization direction of the polarizing film is shown in Table 1 according to the NZ value of the incident angle lambda / 4 retardation layer corresponding to the angle formed by the normal line of the reflective polarizing film and the eye.

The angle formed by T2 along the incident angle (°) NZ 0 ° 10 ° 20 ° 30 ° 40 ° 50 ° 60 ° 70 ° 80 ° One 45 ° 45 ° 46 ° 47 ° 48 ° 49 ° 50 ° 51.5 DEG 53 ° 1.2 45 ° 45 ° 46 ° 47 ° 48.5 DEG 51 ° 53 ° 54.5 DEG 55.5 DEG 1.4 45 ° 45 ° 46 ° 47.5 DEG 49.5 DEG 52 ° 55 ° 57.5 DEG 59 ° 1.6 45 ° 45 ° 46.5 DEG 48.5 DEG 51 ° 54 ° 57.5 DEG 60 ° 62.5 DEG 1.8 45 ° 45.5 DEG 47 ° 49 ° 52 ° 55.5 DEG 59.5 DEG 63 ° 66 ° Angle of incidence: angle formed by the normal line of the reflective polarizing film and the time (eye)
NZ: refractive index ratio

The absolute value of the ratio of the in-plane retardation value (RO) of the second? / 4 retardation layer to that of the first? / 4 retardation layer (RO / second? / 4 retardation layer Of RO is shown in Table 2.

Difference of Ro value according to incident angle (°) NZ 0 ° 10 ° 20 ° 30 ° 40 ° 50 ° 60 ° 70 ° 80 ° One 1.00 1.00 1.00 1.00 1.00 1.02 1.06 1.17 1.44 1.2 1.00 1.00 1.00 1.00 0.99 0.98 0.97 0.97 0.98 1.4 1.00 1.00 1.00 1.00 0.99 0.98 0.98 1.00 1.11 1.6 1.00 1.00 1.00 0.99 0.98 0.96 0.95 0.97 1.07 1.8 1.00 1.00 1.00 0.99 0.98 0.97 0.98 1.09 1.59 Angle of incidence: angle formed by the normal of the reflective polarizing film and the eye
NZ: refractive index ratio

The linearly polarized light emitted from the light source of the second LCD screen display unit becomes a circularly polarized light after passing through the reflective polarizing film and the second? / 4 retardation layer, / 4 retardation layer, and becomes circularly polarized light. When the circularly polarized light passes through the second? / 4 retardation layer, it becomes linearly polarized light in the same direction as that of the light source of the second screen display portion. In the reflective polarizing film, When the direction is reflected unchanged and passes again through the second? / 4 retardation layer, it becomes circularly polarized light. At this time, circularly polarized light of the first screen display part and the second screen display part finally visible to the eyes of the observer have different directions.

That is, in this case, even if the observer wears sunglasses to make linear light, excellent image quality can be displayed.

Also, as shown in Tables 1 and 2, when the incident angle is 40 ° and the NZ value of the second? / 4 retardation layer is generally 1.4, the retardation of the second? / 4 retardation layer and the reflective The angle (T2) formed by the polarization direction of the polarizing film is 49.5 ° and the absolute value of the ratio of the in-plane retardation value (RO) of the first? / 4 retardation layer to the first? / 4 retardation layer / 4 phase difference layer RO / second? / 4 phase difference layer RO |) should be kept at 0.99 to obtain excellent image quality even if the driver wears sunglasses.

Fig. 6 is a graph showing the change in polarization state when the junction angle is 45 deg. In the direction of the oblique angle (? = 270 deg.,? = 40 deg.). Fig. 7 shows an RO value of 149 nm and a junction angle of 49.5 deg. (Φ = 270 °, θ = 40 °) in the direction of the polarized light.

It can be seen that FIG. 6 does not reach the -S3 axis, and FIG. 7 accurately reaches the -S3 axis. That is, as shown in FIG. 7, it can be confirmed that circular polarization can be realized by correction and excellent image quality can be obtained when a driver wears sunglasses.

As described above, when correction of the RO value and the joining angle is required to obtain the circularly polarized light, excellent image quality can be obtained when the driver wears the sunglasses.

Example  4

3, the first LCD screen display unit and the second LCD screen display unit are maintained at 90 degrees, and the first LCD screen display unit and the second LCD screen display unit are positioned at an angle of 45 degrees between the first LCD screen display unit and the second LCD screen display unit, A reflective polarizing film (3M, APF film) was disposed.

The polarization direction of the light emitted from the first screen display unit is 90 °, the polarization direction of the light emitted from the second screen display unit is 0 °, and the direction of the reflected light of the reflection type polarizing film is 0 °.

A third? / 4 retardation layer and a fourth? / 4 retardation layer are bonded to the first LCD screen display portion and the reflection type polarizing film, respectively, and the third? / 4 retardation layer and the fourth? / 4 retardation layer are bonded to each other The bonded surfaces were bonded so as to face each other.

When bonding, the angle (T3) formed by the slow axis of the third? / 4 retardation layer and the absorption axis of the first screen polarizer is 45 °, and the slow axis of the fourth? / 4 retardation layer and the reflective axis The angle (T4) formed by the polarization direction of the polarizing film is as shown in Table 1, and the difference between the front retardation (Ro) values of the third? / 4 retardation layer and the fourth? / 4 retardation layer is shown in Table 2.

The linear polarized light emitted from the light source of the second LCD screen display unit becomes circularly polarized light after passing through the reflection type polarizing film and the fourth? / 4 retardation layer, and the linearly polarized light emitted from the light source of the first LCD screen display unit becomes the third When the circularly polarized light passes through the? / 4 retardation layer and then the circularly polarized light passes through the fourth? / 4 retardation layer, the linearly polarized light becomes linearly polarized light in the same direction as the light source of the first screen display portion, When the light is reflected so that its direction does not change and passes again through the fourth? / 4 retardation layer, it becomes circularly polarized light. At this time, circularly polarized light of the first screen display part and the second screen display part finally visible to the eyes of the observer have different directions.

Further, as shown in Tables 1 and 2, when the incident angle is 40 ° and the NZ value of the fourth? / 4 retardation layer is generally 1.4, the retardation of the fourth? / 4 retardation layer and the reflective The angle (T2) formed by the polarization direction of the polarizing film is 49.5 ° and the absolute value of the ratio of the in-plane retardation value (RO) of the fourth? / 4 retardation layer to the third? / 4 retardation layer / 4 phase difference layer RO / fourth? / 4 phase difference layer RO |) must be maintained at 0.99 to obtain excellent image quality even if the driver wears sunglasses.

10: First screen display section
15: third? / 4 retardation layer
20: Second screen display section
25: first? / 4 retardation layer
30: reflection type polarizing film
33: second? / 4 retardation layer
35: fourth? / 4 retardation layer

Claims (10)

A first screen display unit; A second screen display unit; And a reflection type polarizing film laminated between the first screen display part and the second screen display part,
Wherein the first screen display unit and the second screen display unit are arranged to have 45 to 135 degrees,
The polarization direction of the light emitted from the first screen display unit and the polarization direction of the light emitted from the second screen display unit are perpendicular to each other,
And the polarizing direction of the light emitted from the second screen display unit and the direction of the reflected light of the reflective polarizing film are parallel to each other.
The display device according to claim 1, wherein the polarizing direction of the light emitted from the first screen display portion is 90 °, the polarizing direction of the light emitted from the second screen display portion is 0 °, and the direction of the reflected light of the reflective polarizing film is 0 ° And the three-dimensional image display device.
The display device according to claim 1, wherein the polarization direction of the light emitted from the first screen display unit is 0 °, the polarization direction of the light emitted from the two-screen display unit is 90 °, and the direction of the reflected light of the reflection type polarizing film is 90 ° Wherein the stereoscopic image display device is a stereoscopic image display device.
The stereoscopic image display apparatus of claim 1, wherein the first screen display unit and the second screen display unit are independently LCDs.
The liquid crystal display according to claim 3, wherein two? / 4 retardation layers are arranged between the second screen display part and the reflective polarizing film,
Wherein the first lambda / 4 retardation layer is bonded to the second screen display portion, and the second lambda / 4 retardation layer is bonded to the reflection type polarizing film.
The liquid crystal display according to claim 5, wherein the slow axis of the first lambda / 4 retardation layer is bonded to the absorption axis of the second screen display polarizer at an angle of 45 [deg.] Or 135 [
And the slow axis of the second lambda / 4 retardation layer is bonded to the polarizing direction of the reflective polarizing film so as to form 45 to 63 or 117 to 135.
The method according to claim 6, wherein the absolute value of the ratio of the in-plane retardation value (RO) of the second? / 4 retardation layer to the first? / 4 retardation layer (RO of the second? / 4 retardation layer / 4 phase difference layer RO |) is less than 1.17.
The liquid crystal display according to claim 3, wherein two? / 4 retardation layers are arranged between the first screen display part and the reflective polarizing film,
The third? / 4 retardation layer is bonded to the first screen display portion, and the fourth? / 4 retardation layer is bonded to the reflective polarizing film.
The liquid crystal display according to claim 8, wherein the slow axis of the third? / 4 retardation layer is bonded to form an angle of 45 ° or 135 ° with the absorption axis of the second screen display polarizer,
And the slow axis of the fourth lambda / 4 retardation layer is bonded to the polarization direction of the reflection type polarizing film so as to form 45 to 63 or 117 to 135.
The method as claimed in claim 9, wherein the absolute value of the ratio of the in-plane retardation value (RO) of the fourth? / 4 retardation layer to the third? / 4 retardation layer (RO of the third? / 4 retardation layer / 4 phase difference layer RO |) is less than 1.17.

Images