Patent Publication Number: US-7898604-B2

Title: Three-dimension display

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This is a continuation application of and claims the priority benefit of an application Ser. No. 12/035,436, filed on Feb. 22, 2008, now U.S. Pat. No. 7,821,583, which claims the priority benefit of Taiwan application serial no. 96146008, filed on Dec. 3, 2007. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a display, and more particularly, to a three-dimension display (3D-display) with a liquid crystal display panel (LCD panel) capable of providing images in different polarizations from the different regions thereof. 
     2. Description of Related Art 
     Along with the progresses and developments of science and technology, the people&#39;s enjoyments on recreation and spiritual levels are steadily increasing and never declining. In terms of the spiritual demands, in the age of science and technology dazzlingly changed, people expect to experience the fantastic imaginations by means of a display apparatus so as to have the effect of being physically on the scene. Therefore, how to make a display apparatus produce 3D images or pictures has become an object to be desiderating achieved in the display technology field today. 
     In terms of appearance, the 3D-display technology can roughly be categorized into stereoscopic display mode in which a viewer needs to wear a pair of eyeglasses with specific design and auto-stereoscopic display mode provided to a viewer for directly viewing, wherein the stereoscopic display can be further divided into color filter glasses, polarized glasses and shutter glasses. The stereoscopic 3D-display is based on that the display produces images with specific information for left-right eyes, followed by selecting of a pair of eyeglasses wearing on head so as to enable the left-right eyes of the viewer to see the left-right images for establishing a stereo visual perception. 
       FIG. 1  is a display principle diagram of a 3D-display for a viewer with polarized eyeglasses. Referring to  FIG. 1 , a 3D-display  100  is suitable for a viewer wearing a pair of polarized eyeglasses  110 , wherein the polarized eyeglasses  110  have two linear polarized eyeglasses lenses respectively having a polarization D 1  and a polarization D 2 . The 3-D display  100  includes a flat display panel  120  and a patterned half-wave plate  130 , wherein the patterned half-wave plate  130  is disposed between the flat display panel  120  and the polarized eyeglasses  110 . As shown by  FIG. 1 , the flat display panel  120  has a plurality of pixels arranged in array, and the odd-row pixels and even-row pixels on the flat display panel  120  respectively display a right eye frame R and a left eye frame L, as shown by a frame F 1  in  FIG. 1 . In addition, the flat display panel  120  has an upper polarized plate  140  with an optical axis having an extension direction parallel to the polarization D 1 , so as to make the flat display panel  120  suitable to display a linear polarized image with the polarization D 1 . The patterned half-wave plate  130  includes a plurality of bar patterns B, each of which provides a phase retardation, and the phase retardation enables the linear polarized image with the polarization D 1  to be converted into a linear polarized image with a polarization D 2 . Each of the bar patterns B respectively correspond to a row of pixels in the odd-row, so that the image presented by the odd-row pixels displays a right eye frame R with the polarization D 2  after passing through the bar patterns B, as shown by the frame F 2  in  FIG. 1 . When the viewer wears the polarized eyeglasses  110  to watch the 3-D display  100 , the linear polarized lenses with different polarizations enable the left eye and the right eye of the viewer to see a left eye frame with the polarization D 1  and a right eye frame with the polarization D 2  to establish the stereo visual perception. 
     Although the above-mentioned techniques are able to make a viewer wearing a pair of polarized eyeglasses see 3D-images produced by a flat display successfully, but the viewed 3D-images have high dependence on view angle which may limit the viewing position for a viewer. Therefore, how to reduce the dependence on view angle and expand the viewable angle is one of the developing directions of 3D-displays. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is directed to a 3D-display, which is able to reduce the dependence on view angle for a viewer to use the 3D-display. 
     The present invention is also directed to a fabrication method of a 3D-display, by which two regions with two different circularly-polarized images are produced in the 3D-display to increase the view angle for a viewer to watch 3D-images. 
     In accordance with the above objectives and other objectives, the present invention provides a 3D-display suitable for a viewer wearing eyeglasses to watch 3D-images, wherein the eyeglasses have two circular polarized eyeglass lenses with two different polarizations. The 3D-display includes a flat display panel, a quarter-wave plate (¼-λ, plate) and a patterned half-wave plate. The flat display panel has a plurality of pixels arranged in an array, wherein the flat display panel is suitable to display a linear polarized image. The quarter-wave plate is disposed between the flat display panel and the eyeglasses, wherein the patterned half-wave plate corresponds to a part of the pixels. 
     In an embodiment of the present invention, the flat display panel includes LCD panel (liquid crystal display panel) with linear polarized plate, organic electroluminescent display (OELD) panel, plasma display panel, electro-wetting display panel or the like. 
     In an embodiment of the present invention, the patterned half-wave plate is disposed on the flat display panel, the quarter-wave plate is disposed on the patterned half-wave plate and the patterned half-wave plate is disposed between the quarter-wave plate and the flat display panel. In an embodiment, the 3D-display further includes a substrate and a first alignment layer. The first alignment layer is disposed on the quarter-wave plate and located between the quarter-wave plate and the substrate, and the optical axis of the quarter-wave plate is parallel to the optical axis of the patterned half-wave plate. 
     In an embodiment of the present invention, the quarter-wave plate is disposed on the flat display panel, the patterned half-wave plate is disposed on the quarter-wave plate and the quarter-wave plate is disposed between the patterned half-wave plate and the flat display panel. In an embodiment, the 3D-display further includes a substrate and a first alignment layer. The first alignment layer is disposed on the patterned half-wave plate and located between the patterned half-wave plate and the substrate. In an embodiment, the 3D-display further includes a covering layer and a second alignment layer. The covering layer is disposed between the quarter-wave plate and the patterned half-wave plate. The second alignment layer is disposed between the covering layer and the quarter-wave plate. In another embodiment, the 3D-display further includes a covering layer with alignment function, the covering layer is disposed between the quarter-wave plate and the patterned half-wave plate, and the optical axis of the quarter-wave plate is parallel to the optical axis of the patterned half-wave plate. 
     In an embodiment of the present invention, the patterned half-wave plate includes a plurality of bar patterns, and each bar pattern respectively corresponds to a row of pixels in the even-row pixels. 
     In an embodiment of the present invention, the patterned half-wave plate includes a plurality of bar patterns, and each bar pattern respectively corresponds to a row of pixels in the odd-row pixels. 
     In an embodiment of the present invention, the patterned half-wave plate includes a plurality of bar patterns, and each bar pattern respectively corresponds to a column of pixels in the even-column pixels or a column of pixels in the odd-column pixels. 
     In an embodiment of the present invention, the patterned half-wave plate includes a plurality of island patterns, and each island pattern respectively corresponds to at least one of the pixels. In an embodiment, the island patterns are alternately arranged in the column direction and the row direction. 
     The present invention also provides a fabrication method of a 3D-display. The method includes following steps. First, a flat display panel having a plurality of pixels arranged in an array and suitable to display linear polarized images is provided. Next, a quarter-wave plate and a patterned half-wave plate are fabricated on a substrate, wherein the patterned half-wave plate corresponds to a part of the pixels. Next, the substrate having the quarter-wave plate and the patterned half-wave plate is adhered the flat display panel. 
     In an embodiment of the present invention, the fabrication method of the substrate having the quarter-wave plate and the patterned half-wave plate includes following steps. First, a first alignment layer is formed on the substrate. Next, a quarter-wave plate is formed on the first alignment layer. Next, a patterned half-wave plate is formed on the quarter-wave plate. 
     In an embodiment of the present invention, the fabrication method of the substrate having the quarter-wave plate and the patterned half-wave plate includes following steps. First, a first alignment layer is formed on the substrate. Next, a patterned half-wave plate is formed on the first alignment layer. Next, a quarter-wave plate is formed on the patterned half-wave plate. 
     In an embodiment of the present invention, the fabrication method of the substrate having the quarter-wave plate and the patterned half-wave plate includes following steps. First, a first alignment layer is formed on the substrate. Next, a patterned half-wave plate is formed on the first alignment layer. Next, a covering layer is formed on the patterned half-wave plate. Next, a second alignment layer is formed on the covering layer. Next, a quarter-wave plate is formed on the second alignment layer. 
     In an embodiment of the present invention, the fabrication method of the substrate having the quarter-wave plate and the patterned half-wave plate includes following steps. First, a first alignment layer is formed on the substrate. Next, a patterned half-wave plate is formed on the first alignment layer. Next, a covering layer having alignment function is formed on the patterned half-wave plate. Next, a quarter-wave plate is formed on the covering layer having alignment function. 
     In the 3D-display of the present invention, the different regions of the patterned half-wave plate provide different phase retardations, so that the 3D-display is able to produce left eye frame and right eye frame respectively corresponding to different polarizations and the 3D-display is capable to convert a linear polarized image into a circular polarized image by using quarter-wave. In association with the quarter-wave plate and the patterned half-wave plate is capable for a viewer wearing a pair of polarized eyeglasses see 3D-images with an wider view angle comparing with the prior art, which would largely promote the display quality of 3D-images. In addition, the optical axis of the quarter-wave plate is parallel to the optical axis of the patterned half-wave plate in the present invention, and in the partial embodiments, only a single alignment layer is used to integrate the quarter-wave plate and the patterned half-wave plate. Therefore, the present invention is advantageous in reducing the manufacturing cost as well. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is a display principle diagram of a 3-D display. 
         FIG. 2A  is a diagram of a 3-D display according to a first embodiment of the present invention. 
         FIG. 2B  is a diagram showing an implementation of the patterned half-wave plate in the 3-D display of  FIG. 2A . 
         FIG. 2C  is a diagram showing another implementation of the patterned half-wave plate in the 3-D display of  FIG. 2A . 
         FIG. 3  is a cross sectional diagram of a 3-D display according to the first embodiment of the present invention. 
         FIGS. 4A-4F  are diagrams showing the fabrication method of the 3-D display of the present invention. 
         FIG. 5  is a diagram of a 3-D display according to the second embodiment of the present invention. 
         FIG. 6  is a cross sectional diagram of a 3-D display according to the second embodiment of the present invention. 
         FIGS. 7A-7C  are diagrams showing the fabrication method of the above-mentioned substrate in  FIG. 6  having a quarter-wave plate and a patterned half-wave plate. 
         FIG. 8  is a cross sectional diagram of another 3-D display according to the second embodiment of the present invention. 
         FIGS. 9A-9E  are diagrams showing the fabrication method of the above-mentioned substrate in  FIG. 8  having a quarter-wave plate and a patterned half-wave plate. 
         FIG. 10  is cross sectional diagram of yet another 3-D display according to the first embodiment of the present invention. 
         FIGS. 11A-11D  are diagrams showing the fabrication method of the above-mentioned substrate in  FIG. 10  having a quarter-wave plate and a patterned half-wave plate. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     First Embodiment 
     Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
       FIG. 2A  is a diagram of a 3-D display according to the first embodiment of the present invention. Referring to  FIG. 2A , a 3D-display  200  is suitable for a viewer wearing a pair of circular polarized eyeglasses  210  to watch, wherein the circular polarized eyeglasses  210  have two circular polarized eyeglass lenses  210 L with a left-handed circular polarization and a right-handed circular polarization and the circular polarized eyeglass lens  210 L can be seen as a combination of a quarter-wave plate and a linear polarized plate as shown by  FIG. 2A . In addition, the 3D-display  200  includes a flat display panel  220 , a quarter-wave plate  230  and a patterned half-wave plate  240 . In the embodiment, the patterned half-wave plate  240  is disposed on the flat display panel  220 , the quarter-wave plate  230  is disposed on the patterned half-wave plate  240  and the patterned half-wave plate  240  is located between the quarter-wave plate  230  and the flat display panel  220 . The flat display panel  220  can be LCD panel with upper polarized plate, organic electroluminescent display (OELD) panel, plasma display panel or electro-wetting display panel. In the embodiment, the flat display panel  220  is an exemplarily LCD panel with an upper polarized plate. 
     Still referring to  FIG. 2A , the flat display panel  220  has a plurality of pixels P arranged in an array. In the embodiment, the flat display panel  220  has an upper polarized plate  250 , wherein the extension direction of the optical axis of the upper polarized plate  250  is notated by D 1 , and the flat display panel  220  is suitable to display a linear polarized image with a polarization D 1 . The patterned half-wave plate  240  and the quarter-wave plate  230  are disposed between the flat display panel  220  and the circular polarized eyeglasses  210 , and the patterned half-wave plate  240  corresponds to a part of the pixels; for example, the patterned half-wave plate  240  includes a plurality of bar patterns B and each bar patterns B respectively corresponds to a row of pixels P in the odd-row pixels P. In particular, the bar patterns B on the patterned half-wave plate  240  have a phase retardation function, so that the image displayed by the flat display panel  220  after passing through the bar patterns B get a half wavelength (λ/2) phase retardation. 
     In more detail, the λ/2 phase retardation provided by the patterned half-wave plate  240  in association with the odd-row pixels P makes the linear polarized image with the polarization D 1  converted into the linear polarized image with the polarization D 2  prior to entering the quarter-wave plate  230 . Meanwhile, the phase retardation provided by the patterned half-wave plate  240  in association with the even-row pixels is substantially zero, so that the linear polarized image presented by the even-row pixels after passing through the patterned half-wave plate  240  would keep the original polarization D 1  to enter the quarter-wave plate  230 . The linear polarized image displayed by the flat display panel  220  after passing through the patterned half-wave plate  240  produces a frame F 1  as shown by  FIG. 2A , wherein the frame F 1  is divided into a plurality of bar frames with the polarization D 1  and a plurality of bar frames with the polarization D 2  and the above-mentioned two groups of frames with D 1  and D 2  are alternately arranged. 
     Still referring to  FIG. 2A , the λ/4 phase retardation provided by the quarter-wave plate  230  makes the two groups of linear polarized images with the polarization D 1  and the polarization D 2  respectively converted into left-handed circular circularly-polarized images and right-handed circular circularly-polarized images to then enter the circular polarized eyeglasses  210  worn by the viewer. As shown by the frame F 2  in  FIG. 2A , the frame F 2  is divided into a plurality of left-eye images L and a plurality of right-eye images R, so that the viewer is able to see a 3D-image superposed by the left-eye image L and the right-eye image R of the frame F 2  through the circular polarized eyeglasses  210 . Note that, compared to the prior art where a linear polarized image with a linear polarization is used, the circularly-polarized image with a circular polarization provided by the present invention has almost the same amounts corresponding to all the components in each polarization. Therefore, when a viewer wearing the circular polarized eyeglasses  210  watches the 3D-display  200  in different viewing angles, the viewed 3D-image is more even, and the employed quarter-wave plate  230  is helpful to increase the view angle of the 3D-display in this regard. 
     Each bar pattern B of the patterned half-wave plate  240  can also respectively correspond to a row of pixels P in the even-row pixels P of the flat display panel. In addition, referring to  FIGS. 2B and 2C  where the relationship between the patterned half-wave plate  240  and the pixels P of the flat display panel is shown, a patterned half-wave plate  240  (other components but the patterned half-wave plate  240  are omitted in the figure) includes a plurality of bar patterns B and each bar patterns B respectively corresponding to a column of pixels P in the odd-column pixels. Alternatively, each bar patterns B can respectively correspond to a column of pixels P in the even-column pixels as well. Referring to  FIG. 2C , the patterned half-wave plate  240  (other components but the patterned half-wave plate  240  are omitted in the figure) includes a plurality of island patterns I which are alternately arranged in the column direction and in the row direction and each island pattern I respectively correspond to one of the pixels P, so that the frame has two groups of displayed images alternately arranged as a chessboard, and when the two groups of images pass through the circular polarized eyeglasses  210  worn by the viewer, a 3D-frame is produced. Each island pattern may correspond to a plurality of pixels. Therefore, a designer can specify the relationship between the pattern on the patterned half-wave plate and the pixels of the flat display panel in accordance with the application need. The present invention does not limit the shape, size and arrangement of the patterns on the patterned half-wave plate. 
     Particularly, the 3D-display  200  includes a substrate  310  and a first alignment layer  320  as shown by  FIG. 3 .  FIG. 3  is a cross sectional diagram of a 3-D display according to the first embodiment of the present invention. Referring to  FIG. 3 , the first alignment layer  320  is disposed on the quarter-wave plate  230  and located between the quarter-wave plate  230  and the substrate  310 , wherein the first alignment layer  320  has a specific alignment arrangement for adjusting the optical axes of the quarter-wave plate  230  and the patterned half-wave plate  240 . In the embodiment, the optical axis of the quarter-wave plate  230  is parallel to the optical axis of the patterned half-wave plate  240 . 
     In more detail, the quarter-wave plate  230  and the patterned half-wave plate  240  are made of, for example, phase difference film. The optical behavior of the phase difference film can be adjusted by changing the thickness thereof or the molecular orientation thereof. For example, the quarter-wave plate  230  and the patterned half-wave plate  240  can be made of a same material where the quarter-wave plate  230  and the patterned half-wave plate  240  have different phase retardations by changing the thickness of the phase difference film. In addition, since the optical axis of the quarter-wave plate  230  is parallel to that of the patterned half-wave plate  240  in the embodiment, thus, a single first alignment layer  320  is able to define the optical axes of the quarter-wave plate  230  and the patterned half-wave plate  240 , wherein the alignment direction of the first alignment layer  320  can be adjusted by using various contact alignment processes or without contact alignment processes. 
     In order to more fully describe the present invention, a fabrication method of the 3D-display according to the first embodiment of the present invention is described as follows.  FIGS. 4A-4F  are diagrams showing the fabrication method of the 3-D display of the present invention. The method includes following steps. 
     First, referring to  FIGS. 2A and 4A , a flat display panel  220  is provided. The flat display panel  220  has a plurality of pixels P arranged in an array and is suitable to display a linear polarized image with a polarization D 1 . For example, the flat display panel  220  includes, an LCD panel  222 , a backlight module  224  and an upper polarized plate  250  and a lower polarized plate  226  located at both sides of the LCD panel  222 , wherein the extension direction of the optical axis of the upper polarized plate  250  is D 1 , which makes the LCD panel  222  suitable to display linear polarized image with the polarization D 1 . Next, referring to  FIG. 4B , a first alignment layer  320  is formed on the substrate  310 , wherein the alignment direction of the first alignment layer  320  is D 3  which makes the optical axis extension directions of the quarter-wave plate  230  and the patterned half-wave plate  240  become D 3 , wherein the included angle between the optical axis extension directions D 3  of the quarter-wave plate  230  and the patterned half-wave plate  240  and the optical axis extension direction D 1  of the upper polarized plate  250  is 45° (as shown by  FIG. 2A ). 
     Next, referring to  FIG. 4C , a quarter-wave plate  230  is formed on the first alignment layer  320 , wherein the fabrication method for the quarter-wave plate  230  is, for example, overall coating a phase difference film on the first alignment layer  320 , and the method of coating the phase difference film is, for example, slot-die coating or spin coating through UV (ultraviolet) cross-linking. Next, referring to  FIGS. 2A and 4D , a patterned half-wave plate  240  is formed on the quarter-wave plate  230 , wherein the patterned half-wave plate  240  corresponds to a part of the pixels P; in the embodiment, the patterned half-wave plate  240  has a plurality of bar patterns B corresponding to the pixels of a row. The above-mentioned method of forming the patterned half-wave plate  240  includes, for example, overall coating a phase difference film on the quarter-wave plate  230 , and the method of coating the phase difference film includes, for example, slot-die coating or spin coating, followed by using a photo mask process to define the required bar patterns B, and then, a developing process is used to remove a part of the phase difference film so as to complete the quarter-wave plate  230  and the patterned half-wave plate  240  on the substrate  310 . 
     Referring to  FIG. 4E , the substrate  310  having the quarter-wave plate  230  and the patterned half-wave plate  240  is aligned and adhered to the flat display panel  220 , and the 3D-display  200  after the adhering is shown by  FIG. 4F , which is suitable for a viewer wearing a pair of the circular polarized eyeglasses  210  to watch, wherein the circular polarized eyeglasses  210  have two circular polarized eyeglass lenses  210 L with two different polarizations. 
     Second Embodiment 
       FIG. 5  is a diagram of a 3-D display according to the second embodiment of the present invention. Referring to  FIG. 5 , a 3D-display  400  is similar to the 3D-display  200  of the first embodiment except that the quarter-wave plate  230  and the patterned half-wave plate  240  have different disposing positions from that of the 3D-display  200 . The quarter-wave plate  230  of the 3D-display  400  herein is disposed on the flat display panel  220 , the patterned half-wave plate  240  is disposed on the quarter-wave plate  230  and the quarter-wave plate  230  is located between the patterned half-wave plate  240  and the flat display panel  220 . 
     In the embodiment, the flat display panel  220  has an upper polarized plate  250 , wherein the extension direction of the optical axis of the upper polarized plate  250  is D 1 , which makes the flat display panel  220  suitable to display the linear polarized image with the polarization D 1 . Next, the quarter-wave phase retardation provided by the quarter-wave plate  230  makes the linear polarized image with the polarization D 1  converted into the circular polarized image to be entered into the patterned half-wave plate  240  as shown by the frame F 1  in  FIG. 5 , wherein the circular polarized image is, for example, a left-handed circular polarized image. Next, the image enters into the patterned half-wave plate  240  corresponding to a part of the pixels P. In the embodiment, the patterned half-wave plate  240  includes a plurality of bar patterns B and each bar pattern B respectively corresponds to a row of pixels P in the odd-row pixels P. In particular, the λ/2 phase retardation provided by the patterned half-wave plate  240  in association with the odd-row pixels P makes the circular polarized image converted into another circular polarized image with an opposite polarization. When the circular polarized image with the opposite polarization enters the circular polarized eyeglasses  210  worn by the viewer, the original left-handed circular polarized image is converted into the right-handed circular polarized image, as shown by  FIG. 5 . 
     On the other hand, the phase retardation provided by the patterned half-wave plate  240  in association with the even-row pixels is substantially zero, so that the image presented by the even-row pixels after passing through the patterned half-wave plate  240  would keep the original polarization to enter the circular polarized eyeglasses  210 , so that the image of the frame F 1  after passing through the patterned half-wave plate  240  produces a frame F 2  as shown by  FIG. 5 , wherein the frame F 2  is divided into a plurality of bar-like left eye frame L and a plurality of bar-like right eye frame R both of which are alternately arranged. The viewer wearing a pair of circular polarized eyeglasses  210  at the time is able to see a 3D-image superposed by the left eye frame L and the right eye frame R of the frame F 2 . The pattern on the patterned half-wave plate  240  can be adjusted in accordance with the application need. The present invention does not limit the shape, size and arrangement of the patterns on the patterned half-wave plate  240 . Compared to the prior art in which a linear polarized image is used, the circular polarized image with a circular polarization has substantially the same amounts corresponding to all the components in each polarization; therefore, compared to the conventional 3D-display  100  (shown by  FIG. 1 ), the 3D-display  400  of the embodiment has a better and wider view angle. 
     Particularly, the 3D-display  400  includes a substrate  310  and a first alignment layer  320  as shown by  FIG. 6 .  FIG. 3  is a cross sectional diagram of a 3-D display according to the second embodiment of the present invention. Referring to  FIG. 6 , the first alignment layer  320  is disposed on the patterned half-wave plate  240  and located between the patterned half-wave plate  240  and the substrate  310 , wherein the first alignment layer  320  has a specific alignment arrangement for adjusting the optical axes of the quarter-wave plate  230  and the patterned half-wave plate  240 . In addition, the quarter-wave plate  230  is located between the patterned half-wave plate  240  and the flat display panel  220 . In the embodiment, the optical axis of the quarter-wave plate  230  is parallel to the optical axis of the patterned half-wave plate  240 . 
       FIGS. 7A-7C  are diagrams showing the fabrication method of the above-mentioned substrate in  FIG. 6  having a quarter-wave plate and a patterned half-wave plate. First, referring to  FIG. 7A , a substrate  310  having a first alignment layer  320  is provided, wherein the alignment direction of the first alignment layer  320  is D 3 , which makes the optical axis directions of the quarter-wave plate  230  and the patterned half-wave plate  240  become D 3 . The included angle between the optical axis extension directions D 3  of the ¼-λ, plate  230  and the patterned half-wave plate  240  and the optical axis extension direction D 1  of the upper polarized plate  250  is 45° (as shown by  FIG. 5 ). Next as shown by  FIG. 7B , a patterned half-wave plate  240  is formed on the first alignment layer  320 , wherein the patterned half-wave plate  240  corresponds to a part of the pixels P (as shown by  FIG. 5 ). In the embodiment, the patterned half-wave plate  240  comprises, for example, but not limited to, a plurality of bar patterns B with λ/2 phase retardation. The method for forming the above-mentioned patterned half-wave plate  240  includes, for example, overall coating a phase difference film on the first alignment layer  320  with slot-die coating or spin coating. Next, a photomask process is used to define the required bar patterns B so as to form a plurality of blocks with λ/2 phase retardation and a plurality of blocks with substantially zero phase retardation on the patterned half-wave plate  240 . In the embodiment, the blocks with λ/2 phase retardation and the blocks with zero phase retardation respectively have almost the same film thickness. Next, as shown by  FIG. 7C , a quarter-wave plate  230  is formed on the patterned half-wave plate  240 , wherein the method for forming the quarter-wave plate  230  is, for example, overall coating a phase difference film on the patterned half-wave plate  240  with, for example, slot-die coating or spin coating through UV (ultraviolet) cross-linking so as to complete the quarter-wave plate  230  and the patterned half-wave plate  240 . Further, the substrate  310  having the quarter-wave plate  230  and the patterned half-wave plate  240  is aligned and adhered to the flat display panel  220  to complete the 3D-display  400 . 
     In other embodiments, considering the film thickness of the quarter-wave plate  230  may be varied with the topography of the bottom of the patterned half-wave plate  240  to make the film thickness of the quarter-wave plate  230  not even and further to affect the optical behavior of the 3D-display  400 . Therefore, when the film thickness difference between the regions with the λ/2 phase retardation and the regions with the substantially zero phase retardation is too large, the 3D-display further includes a covering layer  510  and a second alignment layer  520 .  FIG. 8  is a cross sectional diagram of another 3-D display  500  according to the second embodiment of the present invention. Referring to  FIG. 8 , a covering layer  510  is disposed between the quarter-wave plate  230  and the patterned half-wave plate  240  and the second alignment layer  520  is disposed between the covering layer  510  and the quarter-wave plate  230 . The covering layer  510  is for filing and smoothing the topography of the surface of the patterned half-wave plate  240 , so that the quarter-wave plate  230  can be more evenly coated on the surface of the covering layer  510  to further avoid the quarter-wave plate  230  from the influence of the surface pattern of the patterned half-wave plate  240  which may results in uneven coating. In addition, the first alignment layer  320  is employed for defining the optical axis of the patterned half-wave plate  240  and the second alignment layer  520  is employed for defining the optical axis of the quarter-wave plate  230 . In the embodiment, the first alignment layer  320  and the second alignment layer  520  have a same alignment direction. 
       FIGS. 9A-9E  are diagrams showing the fabrication method of the above-mentioned substrate in  FIG. 8  having a quarter-wave plate and a patterned half-wave plate. First, referring to  FIG. 9A , a substrate  310  having a first alignment layer  320  is provided, wherein the alignment direction of the first alignment layer  320  is D 3 . Next as shown by  FIG. 9B , a patterned half-wave plate  240  is formed on the first alignment layer  320 , wherein the patterned half-wave plate  240  corresponds to a part of the pixels P (as shown by  FIG. 5 ). In the embodiment, the patterned half-wave plate  240  comprises, for example, but not limited to, a plurality of bar patterns B with λ/2 phase retardation. The method for forming the above-mentioned patterned half-wave plate  240  includes, for example, overall coating a phase difference film on the first alignment layer  320 . Next, a photomask process is used to define the pattern with λ/2 phase retardation and then a developing process is used to remove the regions with substantially zero phase retardation so as to form the patterned half-wave plate  240  with uneven topography. 
     Still referring to  FIG. 9C , a covering layer  510  is formed on the patterned half-wave plate  240  to cover the pattern on the patterned half-wave plate  240 . Next as shown in  FIG. 9D , a second alignment layer  520  is formed on the covering layer  510 , wherein the second alignment layer  520  and the first alignment layer  320  have a same alignment direction D 3 , and the fabrication method of the second alignment layer  520  is similar to that of the first alignment layer  320 . Next, as shown by  FIG. 9E , the quarter-wave plate  230  is formed on the second alignment layer  520 . Next, the substrate  310  having the quarter-wave plate  230  and the patterned half-wave plate  240  is aligned and then adhered to the flat display panel  220  (as shown by  FIG. 5 ) to complete the 3D-display  500 . 
     In another embodiment, the covering layer  510  and the second alignment layer  520  can be substituted by a covering layer  610  with alignment function, as shown by  FIG. 10 .  FIG. 10  is a cross sectional view of yet another 3-D display according to the first embodiment of the present invention. Referring to  FIG. 10 , a 3D-display  600  can further include a covering layer  610  with alignment function, as shown by  FIG. 10 . The covering layer  610  with alignment function is disposed between the quarter-wave plate  230  and the patterned half-wave plate  240 , and the optical axis of the quarter-wave plate  230  is parallel to that of the patterned half-wave plate  240 . The quarter-wave plate  230  is located between the flat display panel  220  and the covering layer  610  with alignment function. 
       FIGS. 11A-11D  are diagrams showing the fabrication method of the above-mentioned substrate in  FIG. 10  having a quarter-wave plate and a patterned half-wave plate. First referring to  FIG. 11A , a substrate  310  having the first alignment layer  320  is provided, wherein the alignment direction of the first alignment layer  320  is D 3 . Next, as shown in  FIG. 11B , a patterned half-wave plate  240  is formed on the first alignment layer  320 , wherein the fabrication method with the required design considerations are similar to that shown in  FIG. 9B , and therefore is omitted to describe. Next, referring to  FIG. 11C , a covering layer  610  with alignment function is formed on the patterned half-wave plate  240  to cover the pattern on the patterned half-wave plate  240 , wherein the alignment direction of the covering layer  610  with alignment function is the same as the alignment direction D 3  of the first alignment layer  320 . Next, as shown by  FIG. 11D , a quarter-wave plate  230  is formed on the covering layer  610  with alignment function. Next, the substrate  310  having the quarter-wave plate  230  and the patterned half-wave plate  240  is aligned with and then adhered with the flat display panel  220  (as shown by  FIG. 5 ) to complete the 3D-display  600 . 
     In summary, the 3D-display and the fabrication method thereof provided by the present invention have at least following advantages: 
     1. The different regions of the patterned half-wave plate provided by the present invention have different phase retardations and a quarter-wave plate is used to convert a linear polarized image into a circular polarized image. Therefore, a viewer is able to watch the 3D-display having a low dependence on view angle. 
     2. The optical axis of the quarter-wave plate is parallel to the optical axis of the patterned half-wave plate in the present invention. In some embodiments, even a single alignment layer is enough for integrating the quarter-wave plate and the patterned half-wave plate, which largely simplifies the processes. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.