US20090091815A1 - Three-dimensional display device - Google Patents
Three-dimensional display device Download PDFInfo
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- US20090091815A1 US20090091815A1 US11/964,718 US96471807A US2009091815A1 US 20090091815 A1 US20090091815 A1 US 20090091815A1 US 96471807 A US96471807 A US 96471807A US 2009091815 A1 US2009091815 A1 US 2009091815A1
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- display device
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- electrowetting
- dimensional display
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
- G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/30—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving parallax barriers
- G02B30/31—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving parallax barriers involving active parallax barriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
- H04N13/31—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers
- H04N13/315—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers the parallax barriers being time-variant
Definitions
- the present invention relates to a display device. More particularly, the present invention relates to a three-dimensional display device capable of displaying three-dimensional images.
- three-dimensional display technologies can be approximately divided into a stereoscopic type that requires the viewers to wear specially-designed glasses and an auto-stereoscopic type directly viewed with naked eyes.
- the stereoscopic-type three-dimensional display technology has been mature, and it has been widely used on certain special applications, for example, military simulations or large-scale entertainments etc..
- the auto-stereoscopic-type three-dimensional display technology has been gradually developed and becomes a new trend.
- a fixed gating is disposed in front of the display panel, such that the viewer respectively views images corresponding to the display frame with the left eye and the right eye.
- the frame viewed by the viewer is achieved by dividing and spacing the display frame into left-eye and right-eye image display regions in space, which is a spatial-multiplexed manner. Therefore, although the display is made to have the three-dimensionally displaying effect, the resolution for the three-dimensional image display is significantly reduced.
- FIGS. 1A and 1B show a display mechanism for another conventional three-dimensional image display.
- a conventional three-dimensional image display 100 includes a display panel 110 and a liquid crystal barrier 120 .
- the display panel 110 has a plurality of first display regions 112 and second display regions 114 that are arranged in a staggered way
- the liquid crystal barrier 120 has a plurality of first light valve regions 122 and second light valve regions 124 that are arranged in a staggered way.
- the first light valve regions 122 of the liquid crystal barrier 120 are in a shading state, and the second light valve regions 124 are in a transmissive state, so the right eye U R and left eye U L of the viewer respectively view the right eye frame displayed by the second display region 114 and the left eye frame displayed by the first display region 112 through the second light valve region 124 in the transmissive state.
- the first light valve regions 122 of the liquid crystal barrier 120 are in the transmissive state, and the second light valve regions 124 are in the shading state. Therefore, the right eye U R and left eye U L of the viewer respectively view the right eye frame displayed by the first display region 112 and the left eye frame displayed by the second display region 114 through the first light valve region 122 in the transmissive state. Therefore, after the first frame time and the second frame time, due to visual staying effect, the viewer can view the complete three-dimensional image.
- the liquid crystal barrier 120 in the three-dimensional image display 100 adopts an optical controlled birefringence mode (OCB mode), and the liquid crystal barrier 120 needs to additionally adhere a polarizing plate, as a result, the display brightness of the three-dimensional image display cannot be effectively improved.
- OBC mode optical controlled birefringence mode
- the liquid crystal since the liquid crystal is taken as a medium, the designer must perform phase retardation compensation on the image that passes through the liquid crystal barrier 120 . Therefore, a complex optical compensation design is required for the conventional three-dimensional image display.
- the present invention is related to a three-dimensional display device, which includes a display panel and a modulatable electrowetting grating.
- the display panel has a plurality of pixels.
- the modulatable electrowetting grating is disposed on the display panel, and has a plurality of electrowetting light valves corresponding to the pixels.
- the modulatable electrowetting grating is used to make the display panel achieve the three-dimensional displaying effect, so as to reduce image phase retardation compensation procedure, and to reduce the cost.
- FIGS. 1A and 1B show a display mechanism for a conventional three-dimensional image display.
- FIG. 2 shows a three-dimensional display device according to the present invention.
- FIG. 3A is a schematic view of an electrowetting light valve under a shading state according to the present invention.
- FIG. 3B is a schematic view of an electrowetting light valve under a transmissive state according to the present invention.
- FIGS. 4A and 4B show a display mechanism for a three-dimensional display device according to the present invention.
- FIGS. 5A and 5B are schematic views of another electrowetting light valve according to the present invention.
- FIGS. 6A and 6B show a display mechanism for another three-dimensional display device.
- FIG. 2 shows a three-dimensional display device according to the present invention.
- a three-dimensional display device 200 includes a display panel 210 and a modulatable electrowetting grating 220 .
- the display panel 210 has a plurality of pixels P.
- the display panel 210 is, for example, a liquid crystal display panel, a plasma display panel, or an organic light emitting display panel, and the liquid crystal display panel is used as an example for illustration herein.
- each pixel P includes a red sub-pixel P R , a green sub-pixel P G , and a blue sub-pixel P B .
- the modulatable electrowetting grating 220 is disposed on the display panel 210 , and has a plurality of electrowetting light valves 230 corresponding to the pixels P. It should be noted that, as shown in FIG. 2 , each electrowetting light valve 230 has an opaque hydrophobic flowing medium 270 , and each electrowetting light valve 230 generates a transmissive state T and a shading state S through the hydrophobic flowing medium 270 .
- FIG. 3A is a schematic view of an electrowetting light valve under a shading state according to the present invention.
- the electrowetting light valve 230 includes a first transparent electrode 240 , a hydrophobic insulation layer 250 , a patterned dielectric layer 260 , a hydrophobic flowing medium 270 , a hydrophilic flowing medium 280 , and a second transparent electrode 290 .
- the hydrophobic insulation layer 250 is disposed on the first transparent electrode 240 , in which the hydrophobic insulation layer 250 is made of a hydrophobic polymer, for example, fluoropolymer.
- the patterned dielectric layer 260 is disposed on the hydrophobic insulation layer 250 , and the patterned dielectric layer 260 has an opening H located above the first transparent electrode 240 .
- the patterned dielectric layer 260 generally adopts a hydrophilic material, for example, hydrophilic photoresist.
- the hydrophobic flowing medium 270 is disposed on the hydrophobic insulation layer 250 exposed by of the opening H.
- the hydrophobic flowing medium 270 is an opaque hydrophobic flowing medium 270 , for example, dye-containing hydrophobic solution such as decane, dodecane, n-butylbenzene or any combination thereof etc., and the color of the dye may be selected to be an opaque color, for example, black, dark blue, or dark green.
- the hydrophilic flowing medium 280 encapsulates the hydrophobic flowing medium 270 and the patterned dielectric layer 260 , and the hydrophilic flowing medium 280 may be water, sodium chloride aqueous solution, potassium chloride aqueous solution, or another suitable hydrophilic material.
- the second transparent electrode 290 is disposed on the hydrophilic flowing medium 280 , and the first transparent electrode 240 and the second transparent electrode 290 are made of, for example, indium tin oxide (ITO) or indium zinc oxide (IZO).
- the electrowetting light valve 230 may further include a dielectric layer (not shown) disposed between the first transparent electrode 240 and the hydrophobic insulation layer 250 . [ 0023 ] FIG.
- FIG. 3B is a schematic view of an electrowetting light valve under a transmissive state according to the present invention.
- the hydrophilic flowing medium 280 contacts with the hydrophobic insulation layer 250 , so as to change the contact area between the hydrophobic flowing medium 270 and the hydrophobic insulation layer 250 , such that the opaque hydrophobic flowing medium 270 gathers on the hydrophobic insulation layer 250 to make the electrowetting light valve 230 be in the transmissive state T. Therefore, the shading state S or the transmissive state T of each electrowetting light valve 230 can be determined by applying the voltage or not, as shown in FIGS. 3A and 3B .
- the electrowetting light valves 230 of the modulatable electrowetting grating 220 has an advantage of quick response, without resulting in polarization of the light rays.
- the switching period for each electrowetting light valve 230 of the modulatable electrowetting grating 220 may be modulated according to the frame refreshing frequency of the display panel 210 . Therefore, the three-dimensional display device 200 of the present invention has an advantage of maintaining the original resolution of the display panel 210 , without additionally adhering a polarizing plate, so that the display brightness of the three-dimensional display device 200 of the present invention is higher than that of the conventional three-dimensional image display 100 (as shown in FIG. 1A ).
- FIGS. 4A and 4B show a display mechanism for a three-dimensional display device according to the present invention.
- the three-dimensional display device 200 in this embodiment includes a modulatable electrowetting grating 220 formed by the electrowetting light valves 230 and a display panel 210 .
- the number of the electrowetting light valves 230 is substantially the same as that of the pixels P.
- the first electrowetting light valve 230 a is in the shading state S
- the second electrowetting light valve 230 b is in the transmissive state T.
- the image for left eye displayed by the first pixel P 1 is viewed by the left eye U L of the viewer through the second electrowetting light valve 230 b
- the image for right eye displayed by the second pixel P 2 is viewed by the right eye U R of the viewer through the second electrowetting light valve 230 b.
- the first electrowetting light valve 230 a is in the transmissive state T, and the second electrowetting light valve 230 b is in the shading state S.
- the image for right eye displayed by the first pixel P 1 is viewed by the right eye U R of the viewer through the first electrowetting light valve 230 a
- the image for left eye displayed by the second pixel P 2 is viewed by the left eye U L of the viewer through the first electrowetting light valve 230 a
- the display panel 210 is formed by a plurality of first pixels P 1 and second pixels P 2 that are arranged in a staggered way. Therefore, after the first sub-frame time and the second sub-frame time, the viewer can view the complete three-dimensional image due to the visual staying effect.
- the switching frequency of the modulatable electrowetting grating 220 can be adjusted according to the frame refreshing frequency of the display panel 210 , such that the original resolution is maintained when the display panel 210 is involved in the three-dimensional display.
- the switching frequency of the modulatable electrowetting grating 220 may be 120 Hz.
- the first sub-frame time and the second sub-frame time can be adjusted to be 1/120 second, such that the transmissive state T and the shading state S of the electrowetting grating are instantaneously switched in the frame time of the display panel 210 , so as to make the viewer view all the pixels P in the original frame time of the display panel 210 . Therefore, the modulatable electrowetting grating 220 of the present invention not only can prevent the insufficient brightness of the three-dimensional image display device 200 caused by adhering a polarizing plate, but also can avoid the phase retardation occurring to the display images.
- FIGS. 5A and 5B are schematic views of another electrowetting light valve according to the present invention.
- components of an electrowetting light valve 330 are similar to that of the electrowetting light valve 230 of FIG. 3A , and the main difference therebetween lies in the distribution manner of the first transparent electrode 240 .
- the first transparent electrode 240 includes a plurality of sub-electrodes electrically insulated with each other, and in this embodiment, the first transparent electrode 240 includes, for example, two sub-electrodes electrically insulated with each other.
- the first transparent electrode 240 includes a left sub-electrode 240 a and a right sub-electrode 240 b .
- the hydrophobic flowing medium 270 is driven by the voltage difference to gather towards the region of the left sub-electrode 240 a , such that each electrowetting light valve 330 generates a shading region S corresponding to the hydrophobic flowing medium 270 at the left sub-electrode region 330 A, and generates a transmissive region T at the right sub-electrode region 330 B.
- FIG. 5A when a voltage difference V is applied between the right sub-electrode 240 b and the second transparent electrode 290 , the hydrophobic flowing medium 270 is driven by the voltage difference to gather towards the region of the left sub-electrode 240 a , such that each electrowetting light valve 330 generates a shading region S corresponding to the hydrophobic flowing medium 270 at the left sub-electrode region 330 A, and generates
- FIG. 5B shows the electrowetting light valve 330 when a voltage difference V is applied between the left sub-electrode 240 a and the second transparent electrode 290 .
- the electrowetting light valve 330 generates the transmissive region T at the left sub-electrode region 330 A, and generates the shading region S corresponding to the hydrophobic flowing medium 270 at the right sub-electrode region 330 B.
- FIGS. 6A and 6B show a display mechanism for another three-dimensional display device.
- a three-dimensional display device 300 in this embodiment includes a modulatable electrowetting grating 320 formed by the electrowetting light valves 330 and a display panel 210 .
- two sub-electrode regions 330 A and 330 B of each electrowetting light valve 330 respectively correspond to two pixels P, so that the number of the electrowetting light valves 330 is a half of the number of the pixels P.
- the sub-electrode region 330 A of each electrowetting light valve 330 generate a shading region S
- the sub-electrode region 330 B of each electrowetting light valve 330 generates a transmissive region T, such that the image for left eye displayed by the first pixel P 1 of the display panel 210 is viewed by the left eye U L of the viewer through the sub-electrode region 330 B, and the image for right eye displayed by the second pixel P 2 is viewed by the right eye U R of the viewer through the sub-electrode region 330 B.
- the sub-electrode region 330 A of each electrowetting light valve 330 generates a transmissive region T
- the sub-electrode region 330 B generates a shading region S, such that the image for right eye displayed by the first pixel P 1 of the display panel 210 is viewed by the right eye U R of the viewer through the sub-electrode region 330 A, and the image for left eye displayed by the second pixel P 2 is viewed by the left eye U L of the viewer through the sub-electrode region 330 A.
- the display panel 210 is formed by a plurality of first pixels P 1 and second pixels P 2 that are arranged in a staggered way. Therefore, after the neighboring first sub-frame time and second sub-frame time have elapsed, the viewer can view the complete three-dimensional image due to the visual staying effect.
- the modulatable electrowetting grating 320 of this embodiment has an advantage of high transmittance, such that the brightness of the three-dimensional display devices 200 and 300 is further improved, without requiring complex optical compensation procedures.
- the modulatable electrowetting grating is used to make the display panel achieve the three-dimensional displaying effect.
- the modulatable electrowetting grating has an advantage of quick switching between the transmissive state and the shading state, so as to solve the problem that the resolution of the three-dimensional display device is reduced.
- the polarization phenomenon does not occur to the display images when they pass through the modulatable electrowetting grating, so it is not necessary to perform compensation for the image phase retardation, and thus, the present invention has advantages of low manufacturing cost and high yield.
Abstract
Description
- This application claims the priority benefit of Taiwan application serial no. 96137460, filed on Oct. 5, 2007. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
- 1. Field of the Invention
- The present invention relates to a display device. More particularly, the present invention relates to a three-dimensional display device capable of displaying three-dimensional images.
- 2. Description of Related Art
- As for the development of display technology, besides the development trend of being light, thin, and small, an object of displaying a three-dimensional image is also expected. Recently, three-dimensional display technologies can be approximately divided into a stereoscopic type that requires the viewers to wear specially-designed glasses and an auto-stereoscopic type directly viewed with naked eyes. The stereoscopic-type three-dimensional display technology has been mature, and it has been widely used on certain special applications, for example, military simulations or large-scale entertainments etc.. However, due to the factors of being inconvenience and less comfortable, it is difficult for the stereoscopic-type three-dimensional display technology to become popular. Therefore, the auto-stereoscopic-type three-dimensional display technology has been gradually developed and becomes a new trend.
- In a conventional three-dimensional image display, a fixed gating is disposed in front of the display panel, such that the viewer respectively views images corresponding to the display frame with the left eye and the right eye. It should be noted that, when the fixed gating is used as a processing mechanism for the three-dimensional image, the frame viewed by the viewer is achieved by dividing and spacing the display frame into left-eye and right-eye image display regions in space, which is a spatial-multiplexed manner. Therefore, although the display is made to have the three-dimensionally displaying effect, the resolution for the three-dimensional image display is significantly reduced.
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FIGS. 1A and 1B show a display mechanism for another conventional three-dimensional image display. Firstly, referring toFIG. 1A , a conventional three-dimensional image display 100 includes adisplay panel 110 and aliquid crystal barrier 120. Thedisplay panel 110 has a plurality offirst display regions 112 andsecond display regions 114 that are arranged in a staggered way, and theliquid crystal barrier 120 has a plurality of firstlight valve regions 122 and secondlight valve regions 124 that are arranged in a staggered way. - As shown in
FIG. 1A , in a first frame time, the firstlight valve regions 122 of theliquid crystal barrier 120 are in a shading state, and the secondlight valve regions 124 are in a transmissive state, so the right eye UR and left eye UL of the viewer respectively view the right eye frame displayed by thesecond display region 114 and the left eye frame displayed by thefirst display region 112 through the secondlight valve region 124 in the transmissive state. - Next, as shown in
FIG. 1B , in a second frame time next to the first frame time, the firstlight valve regions 122 of theliquid crystal barrier 120 are in the transmissive state, and the secondlight valve regions 124 are in the shading state. Therefore, the right eye UR and left eye UL of the viewer respectively view the right eye frame displayed by thefirst display region 112 and the left eye frame displayed by thesecond display region 114 through the firstlight valve region 122 in the transmissive state. Therefore, after the first frame time and the second frame time, due to visual staying effect, the viewer can view the complete three-dimensional image. - Generally, the
liquid crystal barrier 120 in the three-dimensional image display 100 adopts an optical controlled birefringence mode (OCB mode), and theliquid crystal barrier 120 needs to additionally adhere a polarizing plate, as a result, the display brightness of the three-dimensional image display cannot be effectively improved. In addition, since the liquid crystal is taken as a medium, the designer must perform phase retardation compensation on the image that passes through theliquid crystal barrier 120. Therefore, a complex optical compensation design is required for the conventional three-dimensional image display. - Accordingly, the present invention is related to a three-dimensional display device, which includes a display panel and a modulatable electrowetting grating. The display panel has a plurality of pixels. The modulatable electrowetting grating is disposed on the display panel, and has a plurality of electrowetting light valves corresponding to the pixels.
- In the present invention, the modulatable electrowetting grating is used to make the display panel achieve the three-dimensional displaying effect, so as to reduce image phase retardation compensation procedure, and to reduce the cost.
- In order to make the present invention comprehensible, embodiments accompanied with figures are described in detail below.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
- 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.
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FIGS. 1A and 1B show a display mechanism for a conventional three-dimensional image display. -
FIG. 2 shows a three-dimensional display device according to the present invention. -
FIG. 3A is a schematic view of an electrowetting light valve under a shading state according to the present invention. -
FIG. 3B is a schematic view of an electrowetting light valve under a transmissive state according to the present invention. -
FIGS. 4A and 4B show a display mechanism for a three-dimensional display device according to the present invention. -
FIGS. 5A and 5B are schematic views of another electrowetting light valve according to the present invention. -
FIGS. 6A and 6B show a display mechanism for another three-dimensional display device. -
FIG. 2 shows a three-dimensional display device according to the present invention. Referring toFIG. 2 , a three-dimensional display device 200 includes adisplay panel 210 and a modulatable electrowetting grating 220. Thedisplay panel 210 has a plurality of pixels P. Thedisplay panel 210 is, for example, a liquid crystal display panel, a plasma display panel, or an organic light emitting display panel, and the liquid crystal display panel is used as an example for illustration herein. For example, each pixel P includes a red sub-pixel PR, a green sub-pixel PG, and a blue sub-pixel PB. Themodulatable electrowetting grating 220 is disposed on thedisplay panel 210, and has a plurality of electrowettinglight valves 230 corresponding to the pixels P. It should be noted that, as shown inFIG. 2 , eachelectrowetting light valve 230 has an opaque hydrophobic flowingmedium 270, and each electrowettinglight valve 230 generates a transmissive state T and a shading state S through the hydrophobic flowingmedium 270. -
FIG. 3A is a schematic view of an electrowetting light valve under a shading state according to the present invention. Referring toFIG. 3A , theelectrowetting light valve 230 includes a firsttransparent electrode 240, ahydrophobic insulation layer 250, a patterneddielectric layer 260, a hydrophobic flowing medium 270, a hydrophilic flowing medium 280, and a secondtransparent electrode 290. Thehydrophobic insulation layer 250 is disposed on the firsttransparent electrode 240, in which thehydrophobic insulation layer 250 is made of a hydrophobic polymer, for example, fluoropolymer. The patterneddielectric layer 260 is disposed on thehydrophobic insulation layer 250, and the patterneddielectric layer 260 has an opening H located above the firsttransparent electrode 240. Specifically, in consideration of the flowing smoothness for the hydrophobic flowing medium 270 on the patterneddielectric layer 260, the patterneddielectric layer 260 generally adopts a hydrophilic material, for example, hydrophilic photoresist. - Referring to
FIG. 3A , the hydrophobic flowing medium 270 is disposed on thehydrophobic insulation layer 250 exposed by of the opening H. In this embodiment, the hydrophobic flowing medium 270 is an opaque hydrophobicflowing medium 270, for example, dye-containing hydrophobic solution such as decane, dodecane, n-butylbenzene or any combination thereof etc., and the color of the dye may be selected to be an opaque color, for example, black, dark blue, or dark green. The hydrophilic flowingmedium 280 encapsulates the hydrophobic flowing medium 270 and the patterneddielectric layer 260, and the hydrophilic flowing medium 280 may be water, sodium chloride aqueous solution, potassium chloride aqueous solution, or another suitable hydrophilic material. The secondtransparent electrode 290 is disposed on the hydrophilic flowing medium 280, and the firsttransparent electrode 240 and the secondtransparent electrode 290 are made of, for example, indium tin oxide (ITO) or indium zinc oxide (IZO). In addition, in other embodiments, theelectrowetting light valve 230 may further include a dielectric layer (not shown) disposed between the firsttransparent electrode 240 and thehydrophobic insulation layer 250. [0023]FIG. 3B is a schematic view of an electrowetting light valve under a transmissive state according to the present invention. Referring toFIG. 3B , when a voltage difference V exists between the firsttransparent electrode 240 and the secondtransparent electrode 290, the hydrophilic flowing medium 280 contacts with thehydrophobic insulation layer 250, so as to change the contact area between the hydrophobic flowing medium 270 and thehydrophobic insulation layer 250, such that the opaque hydrophobicflowing medium 270 gathers on thehydrophobic insulation layer 250 to make theelectrowetting light valve 230 be in the transmissive state T. Therefore, the shading state S or the transmissive state T of each electrowettinglight valve 230 can be determined by applying the voltage or not, as shown inFIGS. 3A and 3B . Theelectrowetting light valves 230 of the modulatable electrowetting grating 220 has an advantage of quick response, without resulting in polarization of the light rays. On another aspect, the switching period for each electrowettinglight valve 230 of the modulatable electrowetting grating 220 may be modulated according to the frame refreshing frequency of thedisplay panel 210. Therefore, the three-dimensional display device 200 of the present invention has an advantage of maintaining the original resolution of thedisplay panel 210, without additionally adhering a polarizing plate, so that the display brightness of the three-dimensional display device 200 of the present invention is higher than that of the conventional three-dimensional image display 100 (as shown inFIG. 1A ). -
FIGS. 4A and 4B show a display mechanism for a three-dimensional display device according to the present invention. The three-dimensional display device 200 in this embodiment includes a modulatable electrowetting grating 220 formed by theelectrowetting light valves 230 and adisplay panel 210. Referring toFIGS. 4A and 4B , the number of theelectrowetting light valves 230 is substantially the same as that of the pixels P. Referring toFIG. 4A , in a first sub-frame time, the firstelectrowetting light valve 230 a is in the shading state S, and the secondelectrowetting light valve 230 b is in the transmissive state T. At this time, the image for left eye displayed by the first pixel P1 is viewed by the left eye UL of the viewer through the secondelectrowetting light valve 230 b, and the image for right eye displayed by the second pixel P2 is viewed by the right eye UR of the viewer through the secondelectrowetting light valve 230 b. - Referring to
FIG. 4B , in a second sub-frame time next to the first sub-frame time, the firstelectrowetting light valve 230 a is in the transmissive state T, and the secondelectrowetting light valve 230 b is in the shading state S. At this time, the image for right eye displayed by the first pixel P1 is viewed by the right eye UR of the viewer through the firstelectrowetting light valve 230 a, and the image for left eye displayed by the second pixel P2 is viewed by the left eye UL of the viewer through the firstelectrowetting light valve 230 a. However, thedisplay panel 210 is formed by a plurality of first pixels P1 and second pixels P2 that are arranged in a staggered way. Therefore, after the first sub-frame time and the second sub-frame time, the viewer can view the complete three-dimensional image due to the visual staying effect. - It should be noted that, the switching frequency of the modulatable electrowetting grating 220 can be adjusted according to the frame refreshing frequency of the
display panel 210, such that the original resolution is maintained when thedisplay panel 210 is involved in the three-dimensional display. For example, when the frame refreshing frequency of thedisplay panel 210 is 60 Hz, the switching frequency of the modulatable electrowetting grating 220 may be 120 Hz. In other words, when the frame time for thedisplay panel 210 is 1/60 second, the first sub-frame time and the second sub-frame time can be adjusted to be 1/120 second, such that the transmissive state T and the shading state S of the electrowetting grating are instantaneously switched in the frame time of thedisplay panel 210, so as to make the viewer view all the pixels P in the original frame time of thedisplay panel 210. Therefore, the modulatable electrowetting grating 220 of the present invention not only can prevent the insufficient brightness of the three-dimensionalimage display device 200 caused by adhering a polarizing plate, but also can avoid the phase retardation occurring to the display images. -
FIGS. 5A and 5B are schematic views of another electrowetting light valve according to the present invention. Referring toFIGS. 5A and 5B , components of anelectrowetting light valve 330 are similar to that of theelectrowetting light valve 230 ofFIG. 3A , and the main difference therebetween lies in the distribution manner of the firsttransparent electrode 240. As shown inFIGS. 5A and 5B , the firsttransparent electrode 240 includes a plurality of sub-electrodes electrically insulated with each other, and in this embodiment, the firsttransparent electrode 240 includes, for example, two sub-electrodes electrically insulated with each other. As shown inFIGS. 5A and 5B , the firsttransparent electrode 240 includes a left sub-electrode 240 a and aright sub-electrode 240 b. Referring toFIG. 5A , when a voltage difference V is applied between theright sub-electrode 240 b and the secondtransparent electrode 290, the hydrophobic flowing medium 270 is driven by the voltage difference to gather towards the region of the left sub-electrode 240 a, such that each electrowettinglight valve 330 generates a shading region S corresponding to the hydrophobic flowing medium 270 at the leftsub-electrode region 330A, and generates a transmissive region T at the rightsub-electrode region 330B.FIG. 5B shows theelectrowetting light valve 330 when a voltage difference V is applied between the left sub-electrode 240 a and the secondtransparent electrode 290. Similarly, theelectrowetting light valve 330 generates the transmissive region T at the leftsub-electrode region 330A, and generates the shading region S corresponding to the hydrophobic flowing medium 270 at the rightsub-electrode region 330B. -
FIGS. 6A and 6B show a display mechanism for another three-dimensional display device. A three-dimensional display device 300 in this embodiment includes a modulatable electrowetting grating 320 formed by theelectrowetting light valves 330 and adisplay panel 210. Referring toFIGS. 6A and 6B , twosub-electrode regions light valve 330 respectively correspond to two pixels P, so that the number of theelectrowetting light valves 330 is a half of the number of the pixels P. Referring toFIG. 6A , in the first sub-frame time, thesub-electrode region 330A of each electrowettinglight valve 330 generate a shading region S, and thesub-electrode region 330B of each electrowettinglight valve 330 generates a transmissive region T, such that the image for left eye displayed by the first pixel P1 of thedisplay panel 210 is viewed by the left eye UL of the viewer through thesub-electrode region 330B, and the image for right eye displayed by the second pixel P2 is viewed by the right eye UR of the viewer through thesub-electrode region 330B. - Next, referring to
FIG. 6B , in the second sub-frame time next to the first sub-frame time, thesub-electrode region 330A of each electrowettinglight valve 330 generates a transmissive region T, and thesub-electrode region 330B generates a shading region S, such that the image for right eye displayed by the first pixel P1 of thedisplay panel 210 is viewed by the right eye UR of the viewer through thesub-electrode region 330A, and the image for left eye displayed by the second pixel P2 is viewed by the left eye UL of the viewer through thesub-electrode region 330A. However, thedisplay panel 210 is formed by a plurality of first pixels P1 and second pixels P2 that are arranged in a staggered way. Therefore, after the neighboring first sub-frame time and second sub-frame time have elapsed, the viewer can view the complete three-dimensional image due to the visual staying effect. It can be known from the display mechanism ofFIGS. 6A and 6B , the modulatable electrowetting grating 320 of this embodiment has an advantage of high transmittance, such that the brightness of the three-dimensional display devices - Based on the above descriptions, in the present invention, the modulatable electrowetting grating is used to make the display panel achieve the three-dimensional displaying effect. The modulatable electrowetting grating has an advantage of quick switching between the transmissive state and the shading state, so as to solve the problem that the resolution of the three-dimensional display device is reduced. In addition, the polarization phenomenon does not occur to the display images when they pass through the modulatable electrowetting grating, so it is not necessary to perform compensation for the image phase retardation, and thus, the present invention has advantages of low manufacturing cost and high yield.
- 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.
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TW096137460A TWI354115B (en) | 2007-10-05 | 2007-10-05 | Three-dimensional display apparatus |
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Also Published As
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TWI354115B (en) | 2011-12-11 |
US7515340B1 (en) | 2009-04-07 |
TW200916827A (en) | 2009-04-16 |
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