KR102551577B1 - Stereoscopic display apparatus - Google Patents

Abstract

An example of the present invention relates to a stereoscopic image display device capable of realizing a multi-layer display using one display panel while solving problems of existing multi-layer display structures. The light path changing member according to an embodiment of the present invention reflects the second image reflected by the second reflector in a transmission direction of the first image. A 3D image display device according to an embodiment of the present invention does not generate a Moire phenomenon. In the 3D image display device according to an embodiment of the present invention, there is no degradation in resolution. A 3D image display device according to an example of the present invention can be implemented with a single display panel. Accordingly, the 3D image display device according to an embodiment of the present invention has excellent external light CR compared to a structure using two display panels, and the thickness can be reduced.

Description

Stereoscopic image display device {STEREOSCOPIC DISPLAY APPARATUS}

One example of the present invention relates to a multilayer display device.

Recently, as we enter the information age, the display field that displays image information has developed rapidly. In response to this, various display devices have been developed and are in the spotlight. Display device-related technologies relate to thinning and lightening of display devices, and reduction of power consumption. As related technologies develop, application fields of display devices continue to increase and are used as one of user interfaces in most electronic devices or mobile devices.

Recently, a multi-layer display (MLD) structure has been developed as one technology for displaying a stereoscopic image. One example of the multi-layer display structure is a multi-layer display structure of a laminated structure composed of a front display panel and a rear display panel.

In the multi-layer display structure of the laminated structure, a three-dimensional effect can be expressed by stacking two display panels to selectively display images having different depth information. An image displayed on the front display panel is viewed as an image located at a relatively short distance, and an image displayed on the rear display panel is recognized as an image located at a relatively long distance. Accordingly, an image having a sense of perspective can be visually recognized. In this structure, the depth is adjusted according to the distance between the two display panels.

In this structure, luminance is lowered due to stacking of the two display panels, and a moiré phenomenon may occur. Also, a color expression range may be restricted due to color interference between display panels.

Alternatively, there is also a multi-layer display structure in which two display panels are placed vertically and a half mirror or a reflective polarizing film is disposed between them at an angle of 45°. The half mirror or reflective polarizing film selectively displays an image by transmitting light polarized along a specific axis and reflecting light polarized along an axis perpendicular thereto. The selected images may be floated so that a multilayer display may be implemented. In this structure, the depth is adjusted according to the distance between the display panel and the half mirror or reflective polarizing film.

In this structure, the luminance is increased and the moiré phenomenon is eliminated. However, in this structure, the mechanical volume increases and the upper and lower viewing angles are restricted. In addition, the external light contrast ratio is lowered by the half mirror or the reflective polarizing film.

In addition, in existing multi-layer display structures, a multi-layer display is basically implemented using two display panels.

One example of the present invention is to provide a stereoscopic image display device capable of realizing a multi-layer display using one display panel while solving problems in existing multi-layer display structures.

A 3D image display device according to an embodiment of the present invention includes a display panel displaying a first image and a second image, a light path changing member that transmits the first image and reflects the second image, and is reflected by the light path changing member. and a first reflector for reflecting the second image, and a second reflector for reflecting the second image reflected by the first reflector. The light path changing member according to an embodiment of the present invention reflects the second image reflected by the second reflector in a transmission direction of the first image.

A 3D image display device according to an example of the present invention can be implemented with a single display panel. Accordingly, the 3D image display device according to an embodiment of the present invention has excellent external light CR compared to a structure using two display panels, and the thickness can be reduced.

1 is a plan view illustrating that a display panel according to an example of the present invention displays a first image.
2 is a plan view illustrating that a display panel according to an example of the present invention displays a second image.
3 is a perspective view illustrating that a display panel according to an embodiment of the present invention displays a stereoscopic image by combining a first image and a second image.
4 is a side view of a 3D image display device according to an embodiment of the present invention.
5 is a side view illustrating that a 3D image display device according to an embodiment of the present invention displays a first image.
6 is a waveform diagram of a display panel and a half-wavelength delay cell when a 3D image display device according to an embodiment of the present invention displays a first image.
7 is a cross-sectional view illustrating driving of a half-wavelength delay cell when a first image is displayed in a 3D image display device according to an exemplary embodiment of the present invention.
8 to 10 are side views illustrating that a 3D image display device according to an embodiment of the present invention displays a second image.
11 is a waveform diagram of a display panel and a half-wavelength delay cell when a second image is displayed in a stereoscopic image display device according to an embodiment of the present invention.
12 is a cross-sectional view illustrating driving of a half-wavelength delay cell when a second image is displayed in a stereoscopic image display device according to an embodiment of the present invention.

Advantages and features of the present application, and methods of achieving them, will become clear with reference to examples described below in detail in conjunction with the accompanying drawings. However, the present application is not limited to the examples disclosed below and will be implemented in a variety of different forms, only examples of the present application make the disclosure of the present application complete, and common knowledge in the art to which this application belongs It is provided to fully inform the person who has the scope of the invention, and this application is only defined by the scope of the claims.

Since the shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining an example of the present application are exemplary, the present application is not limited to the matters shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present application, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present application, the detailed description will be omitted.

When 'includes', 'has', 'consists', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal precedence relationship is described in terms of 'after', 'following', 'next to', 'before', etc. It can also include non-continuous cases unless is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first element mentioned below may be the second element within the technical spirit of the present application.

"First horizontal axis direction", "second horizontal axis direction", and "vertical axis direction" should not be interpreted only as a geometric relationship in which the relationship between each other is vertical, and the range in which the configuration of the present application can function functionally It can mean having a wider direction than within.

The term “at least one” should be understood to include all possible combinations from one or more related items. For example, "at least one of the first item, the second item, and the third item" means not only the first item, the second item, or the third item, respectively, but also two of the first item, the second item, and the third item. It may mean a combination of all items that can be presented from one or more.

Each feature of the various examples of the present application can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each example can be implemented independently of each other or can be implemented together in a related relationship. .

Hereinafter, a preferred example of a display device according to the present application and an electronic device including the same will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings.

1 is a plan view illustrating that a display panel 100 according to an example of the present invention displays a first image I1. 2 is a plan view illustrating that the display panel 100 according to an example of the present invention displays a second image I2.

The display panel 100 alternately displays a first image I1 and a second image I2 in the display area DA using a field sequential driving (FSC) method. During a certain frame period, the first image I1 is displayed on the display area DA. During the next frame period of an arbitrary frame, the second image I2 is displayed on the display area DA. The display panel 100 displays the first image I1 and the second image I2 on the display area DA while alternating for each frame.

The frame frequency is 60 Hz or more and 120 Hz or less. When the images on the display panel 100 alternate between 60 and 120 times per second, the first image I1 to the second image I2 or the second image I2 to the first image I1 Transformation cannot be acknowledged. The first image I1 and the second image I2 are viewed as being simultaneously displayed on the display area DA.

3 is a perspective view illustrating that the display panel 100 according to an example of the present invention displays a stereoscopic image by combining a first image I1 and a second image I2.

The first image I1 is recognized by the user 500 to be located on the surface of the display area DA of the display panel 100 . The second image I2 is recognized by the user 500 as being located closer than the display area DA of the display panel 100 . Accordingly, the user 500 recognizes objects displayed in the second image I2 as near objects, and recognizes objects displayed in the first image I1 as distant objects.

In order to recognize objects displayed in the second image I2 as objects located closer than objects displayed in the first image I1, an optical path must be changed when displaying the second image I2. When displaying the second image (I2), when the phase is advanced or the path is shortened as if the light actually traveled a shorter path, or when using light from a virtual image, light is used to express an object located nearby. can change Since the first image I1 and the second image I2 are simultaneously viewed, the user 500 can view an image having a three-dimensional effect.

In the opposite case, it may be controlled so that the objects displayed in the second image I2 are recognized as objects located further away from the objects displayed in the first image I1. When the path of the light emitted when displaying the second image I2 is made longer, the light displayed in the second image I2 is light emitted from a place further away from the surface of the display area DA of the display panel 100. It is recognized by the user 500. Accordingly, the second image I2 is recognized as indicating a distant place. Hereinafter, a method of increasing the optical path of the second image I2 in order to make the optical path of the second image I2 longer than that of the first image I1 will be described in detail in a stereoscopic image display device. do it with

4 is a side view of a 3D image display device according to an embodiment of the present invention. A 3D image display device according to an embodiment of the present invention includes a display panel 100, an upper polarizing film 110, a light path changing member, a first reflector 310, a first circular polarizer 320, and a second reflector 410. ), and a second circularly polarizing plate 420 .

The display panel 100 alternately displays a first image I1 and a second image I2 for each frame according to the field sequential driving method. The display panel 100 may be implemented as a liquid crystal display (LCD) or as an organic light emitting diode (OLED). The display panel 100 may control the frame frequency by an internal timing controller and sequentially drive the fields according to the set frame frequency.

The upper polarizing film 110 is attached to the front surface of the display area of the display panel 100 . The upper polarizing film 110 has a polarization direction in a certain direction. The upper polarizing film 110 polarizes the first image I1 and the second image I2 emitted from the display panel 100 in a polarization direction. For example, when the polarization direction of the upper polarizing film 110 is left and right with reference to FIG. 4 , lights emitted from the display panel 100 displaying the first image I1 and the second image I2 are also left and right. polarized in the direction

The light path changing member transmits the first image I1 and reflects the second image I2. The transmitted first image I1 has the same light path as the actual distance between the display panel 100 and the user 500 . The reflected second image I2 has a longer optical path than the actual distance between the display panel 100 and the user 500 . Accordingly, objects displayed by the second image are recognized by the user 500 as objects located farther than the actual distance between the display panel 100 and the user 500 . The light path changing member includes a half-wave retardation cell 210 and a reflective polarizing film 220 .

The half-wavelength delay cell 210 is disposed on the front surface of the display panel 100 . The half-wavelength delay cell 210 is disposed obliquely to the display panel 100 . An angle between the half-wave delay cell 210 and the display panel 100 may be 45°. One edge of the half-wavelength delay cell 210 and one edge of the display panel 100 may contact each other.

When turned off, the half-wavelength delay cell 210 transmits incident light without converting a light path or delaying a phase. The half-wavelength delay cell 210 delays the phase by half-wavelength (λ/2) when turned on. Light whose phase is delayed by half a wavelength is viewed as if it has traveled a distance by half a wavelength. In addition, the polarization direction of light whose phase is delayed by half a wavelength is changed vertically.

The half-wavelength delay cell 210 is turned on and off the same number of times as the frame frequency of the display panel 100 . The half-wavelength delay cell 210 is driven alternately by synchronizing the light displaying the first image I1 and the light displaying the second image I2 at the same time when they are incident. To this end, the half-wavelength delay cell 210 may receive timing signals from a timing controller that sets the frame frequency of the display panel 100 .

A reflective polarizing film 220 is disposed adjacent to the back side of the half-wave retardation cell 210 . The reflective polarizing film 220 has a transmission axis and a reflection axis. A transmission axis and a reflection axis of the reflective polarizing film 220 are perpendicular to each other. The reflective polarizing film 220 transmits light polarized in a direction coincident with the transmission axis. The reflective polarizing film 220 reflects light polarized in a direction coincident with the reflection axis. That is, the reflective polarizing film 220 reflects light polarized in a direction perpendicular to the transmission axis. The reflective polarizing film 220 is commonly referred to as APF, and a representative example of APF is a dual brightness enhancement film (DBEF) manufactured by Minnesota Mining and Manufacturing.

According to experiments, when DBEF is applied as the reflective polarizing film 220, transmittance of 92% and reflectance of 95% are obtained. Accordingly, since the sum of transmittance and reflectance of the reflective polarizing film 220 exceeds 100%, luminance of a stereoscopic image can be greatly increased.

The reflective polarizing film 220 may be replaced with a transflective mirror (or half mirror). However, since a transflective mirror transmits a part of the incident light and reflects the rest, it has approximately 50% transmittance and 50% reflectance, and the sum of transmittance and reflectance does not exceed 100%. Accordingly, when a transflective mirror (or half mirror) is used as the reflective polarizing film 220, a clear and lively image is obtained due to a decrease in luminance of an image due to low transmittance of the transflective mirror, for example, 50% transmittance. 3D images cannot be realized. Therefore, the present invention uses a DBER that has transmittance and reflectance of 90% or more or the sum of transmittance and reflectance exceeds 100%, and the first and second images I1 and I2 are polarized according to the polarization states of the first and second images I1 and I2. By transmitting or reflecting each of the two images I1 and I2, the luminance of the stereoscopic image can be greatly increased compared to the transflective mirror.

The first reflector 310 is disposed on one side of the display panel 100 . The first reflector 310 may be disposed perpendicular to the display panel 100 . The first reflector 310 is obliquely disposed on the front surface of the half-wave delay cell 210 . An angle between the first reflector 310 and the half-wave delay cell 210 may be 45°. One corner of the first reflector 310 and one corner of the display panel 100 may come into contact with each other. The other edge of the first reflector 310 and one edge of the half-wave delay cell 210 may come into contact with each other. The first reflector 310 may be implemented as a metal reflector or a mirror. The first reflector 310 reflects the second image I2 reflected by the light path changing member. The first reflector 310 reflects the second image I2 toward the light path changing member.

The first circularly polarizing plate 320 is disposed adjacent to the front surface of the first reflecting plate 310 . The first circular polarizer 320 may be disposed vertically with the display panel 100 . The first circular polarizer 320 is obliquely disposed on the entire surface of the half-wave delay cell 210 . An angle between the first circular polarizer 320 and the half-wave delay cell 210 may be 45°. One side edge of the first circular polarizing plate 320 and one side edge of the display panel 100 may come into contact with each other. The other edge of the first circular polarizer 320 and one edge of the half-wave delay cell 210 may come into contact with each other.

The first circularly polarizing plate 320 circularly polarizes the second image I2 reflected by the light path changing member. The circularly polarized second image I2 becomes circularly polarized. The second image I2 in a circularly polarized state is polarized in a direction coincident with the transmission axis of the reflective polarizing film 220 while passing through the half-wave retardation cell 210 inside the optical path changing member. Accordingly, the second image I2 reflected by the first reflector 310 passes through the light path changing member.

The second reflector 410 is disposed on the other side of the display panel 100 . The second reflector 410 may be disposed perpendicular to the display panel 100 . The second reflector 410 is obliquely disposed on the front surface of the reflective polarizing film 220 . An angle between the second reflector 410 and the reflective polarizing film 220 may be 45°. One edge of the second reflector 410 and one edge of the display panel 100 may come into contact with each other. The other edge of the second reflector 410 and one edge of the reflective polarizing film 220 may come into contact with each other. The second reflector 410 may be implemented as a metal reflector or a mirror. The second reflector 410 reflects the second image I2 that is reflected by the first reflector 310 and then transmitted through the light path changing member. The second reflector 410 reflects the second image I2 toward the light path changing member.

The second circularly polarizing plate 420 is disposed adjacent to the front surface of the second reflecting plate 410 . The second circular polarizing plate 420 may be disposed vertically with the display panel 100 . The second circular polarizing plate 420 is obliquely disposed on the front surface of the reflective polarizing film 220 . An angle between the second circular polarizing plate 420 and the reflective polarizing film 220 may be 45°. One edge of the second circular polarizing plate 420 and one edge of the display panel 100 may come into contact with each other. The other edge of the second circular polarizing plate 320 and one edge of the reflective polarizing film 220 may come into contact with each other.

The second circularly polarizing plate 420 circularly polarizes the second image I2 after being reflected by the first reflecting plate 310 and transmitted through the light path changing member. The circularly polarized second image I2 becomes circularly polarized. The circularly polarized second image I2 is polarized in a direction perpendicular to the transmission axis of the reflective polarizing film 220 . Accordingly, the second image I2 reflected by the second reflector 410 is reflected in the transmission direction of the first image by the light path changing member.

5 is a side view illustrating that a 3D image display device according to an embodiment of the present invention displays a first image I1.

When the first image I1 is displayed on the display panel 100 , the reflective polarizing film 220 is attached such that the transmission axis of the reflective polarizing film 220 coincides with the polarization axis of the upper polarizing film 110 . That is, the reflective polarizing film 220 is disposed to coincide with the polarization direction of the first image I1.

When the first image I1 is displayed on the display panel 100, the half-wavelength delay cell 210 is turned off. That is, the half-wavelength delay cell 210 is in a non-driving state. Accordingly, the half-wavelength delay cell 210 does not change the axis or delay the phase of the first image I1.

The first image I1 emitted from the display panel 100 passes through the half-wave retardation cell 210 and the reflective polarizing film 220 as it is, and is recognized by the user 500 . Until the first image I1 is viewed by the user 500, the light path has the same distance as the distance between the display panel 100 and the user 500.

6 is a waveform diagram of the display panel 100 and the half-wavelength delay cell 210 when the 3D image display device according to an example of the present invention displays the first image I1.

As described above, the display panel 100 alternately displays the first image I1 and the second image I2 every frame in the field sequential driving method. When the stereoscopic image display device displays the first image I1, it corresponds to the first frame (Frame 1).

The half-wavelength delay cell 210 is turned on and off at the same frequency as the frame frequency of the display panel 100 . In the first frame (Frame 1), the half-wavelength delay cell 210 is turned off.

7 is a cross-sectional view illustrating driving of the half-wavelength delay cell 210 when the 3D image display device according to an example of the present invention displays the first image I1.

The half-wave retardation cell 210 includes a lower electrode 211 , an upper electrode 212 , and a liquid crystal cell 213 . The liquid crystal cell 213 is encapsulated between the lower electrode 211 and the upper electrode 212 or disposed in a cell form. When the first image I1 is displayed, the half-wavelength delay cell 210 is turned off. In this case, no electric field is formed between the lower electrode 211 and the upper electrode 212 of the half-wavelength delay cell 210 . In the absence of an electric field, the liquid crystal cells 213 applied to the half-wave retardation cell 210 are arranged in a vertical direction. That is, the liquid crystal cell 213 is disposed in a form that transmits light without blocking or delaying light.

8 to 10 are side views illustrating that a 3D image display device according to an embodiment of the present invention displays a second image I2.

When the second image I2 is displayed on the display panel 100 , the reflective polarizing film 220 is attached so that the transmission axis of the reflective polarizing film 220 coincides with the polarization axis of the upper polarizing film 110 . For example, when the polarization axis of the upper polarizing film 110 is in the left-right direction, the transmission axis of the reflective polarizing film 220 is also in the left-right direction. At this time, the reflection axis of the reflective polarizing film 220 is a vertical direction perpendicular to the transmission axis.

When the second image I2 is displayed on the display panel 100, the half-wavelength delay cell 210 is turned on. That is, the half-wavelength delay cell 210 is in a driving state. Accordingly, the half-wave delay cell 210 vertically changes the axis of the second image I2. Also, the half-wavelength delay cell 210 delays the phase of the second image I2 by half-wavelength.

8 shows the first progress step of the second image I2.

The second image I2 has a left-right polarization axis while passing through the upper polarizing film 110 in the display panel 100 . The second image I2 polarized in the left and right directions passes through the half-wavelength delay cell 210 . At this time, the half-wave delay cell 210 vertically changes the axis of the second image I2. Also, the half-wavelength delay cell 210 delays the phase of the second image I2 by half-wavelength. Accordingly, the second image I2 passing through the half-wavelength delay cell 210 has a polarization axis in the vertical direction.

Therefore, when the second image I2 reaches the reflective polarizing film 220, it has a polarization direction coincident with the reflection axis of the reflective polarizing film 220, and is reflected from the reflective polarizing film 220. The second image I2 is reflected toward the first reflector 310 . The second image I2 reflected from the reflective polarizing film 220 passes through the half-wave retardation cell 210 one more time and is directed toward the first reflector 310 while having a left-right polarization axis.

9 shows a second progress step of the second image I2.

The second image I2 incident on the first reflector 310 is left circularly polarized by the first circular polarizer 320 . The second image I2 left circularly polarized by the first circular polarizing plate 320 is reflected by the first reflecting plate 310 . The polarization direction of the second image I2 is reversed while being reflected at the fixed end by the first reflector 310, resulting in right circular polarization. The second image I2, which is right circularly polarized while reflecting, is polarized up and down while passing through the first circular polarizer 320 again.

The second image I2 reflected from the first reflector 310 is directed toward the half-wave delay cell 210 . As the second image I2 passes through the half-wavelength delay cell 210, its phase is delayed by half-wavelength, and its polarization direction changes from up-down direction to left-right direction. Accordingly, the second image I2 reflected from the first reflector 310 passes through the reflective polarizing film 220 in which the left and right directions are transmission axes. The second image I2 transmitted through the reflective polarizing film 220 is directed toward the second reflector 410 .

10 shows a third progress step of the second image I2.

The second image I2 incident on the second reflector 410 is left circularly polarized by the second circular polarizer 420 . The second image I2 left circularly polarized by the second circularly polarizing plate 420 is reflected by the second reflecting plate 410 . The second image I2 is reflected at the fixed end by the second reflector 410 and the polarization direction is reversed, resulting in right circular polarization. The second image I2, which is right circularly polarized while being reflected, is polarized up and down while passing through the second circular polarizer 420 again.

The second image I2 reflected by the second reflector 410 is directed toward the reflective polarizing film 220 . The second image I2 is reflected from the reflective polarizing film 220 in which the vertical direction is the reflection axis. The second image I2 reflected from the reflective polarizing film 220 is directed toward the user 500, which is the transmission direction of the first image I1.

11 is a waveform diagram of a display panel and a half-wavelength delay cell when a second image is displayed in a stereoscopic image display device according to an embodiment of the present invention.

As described above, the display panel 100 alternately displays the first image I1 and the second image I2 every frame in the field sequential driving method. When the stereoscopic image display device displays the second image I2, it corresponds to the second frame (Frame 2).

The half-wavelength delay cell 210 is turned on and off at the same frequency as the frame frequency of the display panel 100 . In the second frame (Frame 2), the half-wavelength delay cell 210 is turned on.

12 is a cross-sectional view illustrating driving of a half-wavelength delay cell when a second image is displayed in a stereoscopic image display device according to an embodiment of the present invention.

The half-wave retardation cell 210 includes a lower electrode 211 , an upper electrode 212 , and a liquid crystal cell 213 . The liquid crystal cell 213 is encapsulated between the lower electrode 211 and the upper electrode 212 or disposed in a cell form. When the second image I2 is displayed, the half-wavelength delay cell 210 is turned on. In this case, an electric field is formed between the lower electrode 211 and the upper electrode 212 of the half-wavelength delay cell 210 . When there is an electric field, the liquid crystal cells 213 applied to the half-wave retardation cell 210 are arranged in a horizontal direction. That is, the liquid crystal cell 213 is disposed in a form of blocking or delaying light.

In this way, when a 3D image display device having separate light paths for the first image I1 and the second image I2 is implemented, the half-wavelength delay cell 210, the reflective polarizing film 220, the first and When the reflectance and transmittance of the second reflectors 310 and 410 and the first and second circular polarizers 320 and 420 are known, the final luminance of the first image I1 and the second image I2 can be compared. can

For example, the transmittance of the half-wave delay cell 210, the first and second circular polarizers 320 and 420 is 95%, the transmittance of the reflective polarizing film 220 is 92%, and the reflective polarizing film 220 , it may be assumed that the reflectance of the first and second reflectors 310 and 410 is 95%.

In this case, a ratio of final luminance to luminance at the time of passing from the upper polarizer 110 to the half-wave retardation cell 210 according to the transmission or reflection path may be calculated. As a result of the calculation, the first image I1 has about 87.4% of the initial luminance, and the second image I2 has about 52.3% of the luminance.

The luminance of the second image I2, which has more transmission or reflection, is reduced compared to the first image I1, but since the second image I2 is an image representing a distant object, it is natural that the luminance is low. In addition, the luminance of the second image I2 is greatly increased compared to the method of stacking panels among existing multi-layer display structures.

In summary, the present invention can implement a floating multi-layer display (MLD) with one display panel 100 by utilizing sequential driving.

In the first frame (Frame 1), the first image (I1) is displayed. The first image H1 is transmitted through the half-wavelength liquid crystal cell 210 in a turned-off state and the reflective polarizing film 220 whose transmission axis coincides with the polarization direction of the first image I1, and is thus transmitted to the user. Admitted to (500).

In the second frame (Frame 2), the second image (I2) is displayed. The phase of the second image H2 is delayed by the turned-on half-wavelength liquid crystal cell 210 . As the phase delays, the polarization direction also coincides with the reflection axis of the reflective polarizing film 220 and is reflected by the reflective polarizing film 220 . The reflected second image I2 is doubled by the first reflecting plate 310, the first circular polarizing plate 320, the second reflecting plate 410, and the second circular polarizing plate 420 disposed on the upper and lower portions, respectively. It is reflected. The reflected second image I2 is reflected by the reflection axis of the reflective polarizing film 220 and viewed by the user 500 .

A 3D image display device according to an embodiment of the present invention does not generate a Moiré phenomenon and can prevent resolution deterioration. A stereoscopic image display device according to an embodiment of the present invention transmits and reflects two images from a single display panel to a first image and a second image having different polarization states through an optical path changing member, thereby providing high brightness and high resolution It is possible to implement a lively three-dimensional image while having That is, the 3D image display apparatus according to the present invention can implement a lively 3D image with high brightness and high resolution by displaying a floating image corresponding to the second image together with the transmitted first image.

A 3D image display device according to an example of the present invention can be implemented with a single display panel. Accordingly, the 3D image display device according to an example of the present invention has an excellent external light contrast ratio (CR) compared to a structure using two display panels, and the thickness can be reduced.

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which this application belongs that various substitutions, modifications, and changes are possible without departing from the technical details of the present application. It will be clear to those who have knowledge of Therefore, the scope of the present application is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present application.

100: display panel DA: display area
110: upper polarizing film 210: half-wave retardation cell
211: lower electrode 212: upper electrode
213: liquid crystal cell 220: reflective polarizing film
310: first reflector 320: first circular polarizer
410: second reflector 420: second circular polarizer
500: users I1, I2: first and second images

Claims (8)

a display panel displaying a first image and a second image;
an optical path changing member that transmits the first image and reflects the second image;
a first reflector for reflecting the second image reflected by the optical path changing member; and
A second reflector for reflecting the second image reflected by the first reflector;
The light path changing member,
A 3D image display apparatus which reflects a second image reflected by the second reflector in a transmission direction of the first image. The method of claim 1, wherein the light path changing member,
a half-wavelength delay cell that retards the phase of transmitted light by half-wavelength when turned on; and
A three-dimensional image display device comprising: a reflective polarizing film that transmits light polarized in a direction coincident with an internal transmission axis and reflects light polarized in a direction perpendicular to the transmission axis. According to claim 2,
and a first circular polarizing plate for circularly polarizing the second image reflected by the optical path changing member. According to claim 3,
and a second circular polarizing plate for circularly polarizing the second image reflected by the first reflecting plate. According to claim 4,
The half-wavelength delay cell,
Turned off when the display panel displays the first image,
The reflective polarizing film,
A three-dimensional image display device that transmits the first image displayed by the display panel. According to claim 4,
The half-wavelength delay cell,
Turned on when the display panel displays the second image,
The reflective polarizing film,
A 3D image display apparatus which reflects the second image displayed by the display panel to the first reflector. According to claim 6,
The reflective polarizing film,
and transmits the second image reflected by the first reflector toward the second reflector. According to claim 7,
The reflective polarizing film,
and reflecting the second image reflected by the second reflection plate in a transmission direction of the first image.

Images