WO2004029677A1 - フレネルレンズシート、これを用いた透過型スクリーン、及び背面透過型表示装置 - Google Patents
フレネルレンズシート、これを用いた透過型スクリーン、及び背面透過型表示装置 Download PDFInfo
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- WO2004029677A1 WO2004029677A1 PCT/JP2003/012152 JP0312152W WO2004029677A1 WO 2004029677 A1 WO2004029677 A1 WO 2004029677A1 JP 0312152 W JP0312152 W JP 0312152W WO 2004029677 A1 WO2004029677 A1 WO 2004029677A1
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- WIPO (PCT)
- Prior art keywords
- light
- fresnel lens
- lens sheet
- angle
- total reflection
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
Definitions
- the present invention relates to a Fresnel lens sheet for a transmission screen used in a projection television (PTV) or the like, a transmission screen using the same, and a rear transmission display device. More specifically, the present invention relates to a Fresnel lens sheet that can be suitably used in a transmissive screen of a type in which light is incident at a steep angle from the rear side, a transmissive screen using the same, and a rear transmissive display device. Things.
- this type of Fresnel lens sheet 71 has a structure in which a plurality of prisms 72 having a refraction surface 73 and a total reflection surface 74 are provided on the light incident surface side, as shown in FIG. It is known (for example, Japanese Patent Application Laid-Open No. 61-20841 (pages 2 to 5, FIG. 8).
- FIG. 17A, FIG. 17B, FIG. Fig. 17 shows a partially enlarged view of parts A and B.
- the light is incident at an acute angle from the projector M arranged on the rear side. After being transmitted through the refraction surface 73 with refraction, the light X is totally reflected by the total reflection surface 74 and emitted in a direction perpendicular to the sheet surface.
- the light X is incident from the projector M at a steep angle as described above, so that the incident angle ⁇ B of the light X1 incident on the prism P1 close to the projector M is compared with the incident angle ⁇ B.
- the incident angle ⁇ A of the light X2 incident on the prism P2 far from the projector M becomes large. Therefore, in order to reflect the incident light X in the direction perpendicular to the sheet surface in all the prisms 72, the angle ⁇ formed by the total reflection surface 74 and the sheet surface is far from the prism close to the projector ⁇ . It is necessary to set it so that it becomes smaller gradually by applying it to the prism.
- the angle ⁇ formed between the refracting surface 73 and the sheet surface gradually increases from the prism close to the projection device ⁇ to the prism far from the projection device ⁇ .
- a transmissive screen is constructed using the Fresnel lens sheet 71 thus formed.
- the Fresnel lens sheet 71 is generally formed by an ultraviolet radiation curable resin method or a hot press method.
- a mold for forming a Fresnel lens is filled with UV-Z radiation curing resin, the resin is cured by irradiating UV-Z radiation, and then removed from the mold to remove the Fresnel lens sheet.
- This is a method for forming 7 1.
- a mold for forming a Fresnel lens is filled with a heated resin, pressed, and then removed from the mold to form a Fresnel lens sheet.
- the molds used in these molding methods are manufactured by cutting mold materials (eg, aluminum, brass, copper, steel, etc.) with a byte or the like. At this time, as described above, since the angle formed by the refraction surface 73 and the total reflection surface 74 with the sheet surface is different for each prism, the cutting of the mold becomes very complicated.
- mold materials eg, aluminum, brass, copper, steel, etc.
- the prism 72 plays a wedge-like role, making it difficult to remove from the mold. And even if the resin can be removed from the mold, it can be damaged.
- the present invention has been made in view of the above circumstances, and provides a Fresnel lens sheet having a low transmission ratio of stray light and a high transmission efficiency while ensuring moldability, a transmission screen using the same, and a rear transmission display device. It is intended to do so.
- the present invention provides a total reflection type Fresnel lens sheet having a light incident surface and a light exit surface, wherein light projected from a light source enters the light incident surface and exits the light exit surface.
- a plurality of prisms provided on the light incident surface and having a refraction surface and a total reflection surface. The light from the light source is refracted by the refraction surface and then totally reflected by the total reflection surface.
- the angle formed by the reflecting surface is substantially the same, and the angle formed by the refracting surface of the prism located farthest from the light source and the sheet surface is substantially a right angle.
- the angle between the refraction surface and the total reflection surface is substantially the same in all prisms, so that the mold used for molding the Fresnel lens sheet is formed. In this case, it is not necessary to perform cutting using a plurality of bytes or to cut one prism portion in multiple passes, so that efficient die machining can be performed. Also, since the angle between the refracting surface and the sheet surface of the prism located farthest from the light source is approximately a right angle, when removing the molded Fresnel lens sheet from the mold, the Fresnel lens sheet will There is no chance that it will not come off and it will not damage the Fresnel lens sheet.
- the angle between the refracting surface and the sheet surface is set to the maximum (90 °) as far as it does not hinder the manufacture of the Fresnel lens sheet as described above, it is possible to reduce the rate of occurrence of stray light. it can.
- the total reflection surface and the sheet surface are arranged such that light reflected on the total reflection surface is reflected in a direction inclined toward the light source side from a direction perpendicular to the sheet surface. Is set.
- the direction in which light is reflected by the total reflection surface is preferably a direction inclined to the young light source side from a direction perpendicular to the sheet surface.
- the angle of the total reflection surface may be set so that the reflection angle is inclined at least for the prism farthest from the light source.
- the angle of the prism that is farthest from the light source should be about 60 mm.
- the angle of the total reflection surface can be set so that the reflection angle is inclined for a certain prism.
- the tilt angle of the prisms in the range may be fixed, but it is preferable that the tilt angle is set to be the maximum in the prism located farthest from the light source so that the tilt angle decreases as approaching the light source. good.
- the present invention is a Fresnel lens sheet, characterized in that a low refractive index layer made of a material having a low refractive index is formed on the surface of the light incident surface.
- the present invention is a Fresnel lens sheet, further comprising at least one of a light diffusing element for diffusing light and a light absorbing element for absorbing light.
- a light diffusing element for diffusing light when stray light is generated, the stray light is reflected and refracted by the light exit surface, the refraction surface and the total reflection surface, and travels inside the Fresnel lens sheet (partially outside the Fresnel lens sheet). Later, part of the light is emitted to the light emitting surface side and overlaps with the normal image, which may cause a so-called double image problem.
- the present invention when the stray light travels in the Fresnel lens sheet, the stray light is diffused by the light diffusing element, or the stray light is absorbed by the light absorbing element so that the above-described problem of the double image does not occur. Alternatively, it can be reduced.
- the present invention is the Fresnel lens sheet, wherein the light diffusing element is made of a diffusing material dispersed so that the half value angle of diffusion is 10 ° or less.
- the present invention is the Fresnel lens sheet, wherein the light diffusing element comprises a horizontal lenticular lens formed on the light exit surface such that the half-diffusion angle is 10 ° or less.
- the problem of double lines caused by stray light as described above can be solved. Also, since the half-diffusion angle is set to 10 ° or less, there is no possibility that the diffusion becomes too large to be used as a Fresnel lens sheet.
- the diffusion half-value angle may be 10 ° or less, preferably 5 ° or less, and more preferably about 2 °.
- the present invention is the Fresnel lens sheet, wherein the light absorbing element is made of a coloring component added so that the light absorption rate is 5 °% or less.
- the present invention is the Fresnel lens sheet, wherein the light absorbing element comprises a light absorbing layer arranged perpendicular to the sheet surface.
- the problem of double images caused by stray light as described above can be solved.
- the light absorbing layer is arranged vertically, it does not absorb light that is emitted normally.
- the present invention provides a total reflection type Fresnel lens sheet having a light incident surface and a light exit surface, wherein light projected from a light source enters the light incident surface and exits the light exit surface, and is provided on the light incident surface. Equipped with a plurality of prisms having a refraction surface and a total reflection surface, the light from the light source is refracted by the refraction surface and then totally reflected by the total reflection surface.
- the Fresnel lens sheet is characterized in that the angle between the refracting surface of the prism located farthest from the light source and the sheet surface is substantially a right angle.
- This is a transmissive screen characterized by integrally providing a light diffusing element for diffusing light.
- the light diffusing element examples include a diffusing material dispersed in a Fresnel lens sheet, a lenticular lens formed on a light exit surface of a Fresnel lens sheet, and the like.
- a light diffusing element such as a diffusing material or a lenticular lens is formed so that the half value angle of diffusion is 10 ° or more, preferably 20 ° or more.
- the present invention relates to a total reflection type Fresnel lens sheet having a light incident surface and a light exit surface, wherein light projected from a light source enters the light entrance surface and exits the light exit surface, and is provided on the light entrance surface. It has a plurality of prisms with a refraction surface and a total reflection surface. The light from the light source is refracted by the refraction surface and then totally reflected by the total reflection surface. The angle between the refraction surface and the total reflection surface in each prism is approximately Fresnel lens sheet, characterized in that the angle between the refracting surface of the prism located farthest from the light source and the sheet surface is substantially a right angle, and the light exit surface side of the Fresnel lens sheet And a light-diffusing element for diffusing light.
- the present invention has a box forming an exterior, and is mounted on a window provided on a front surface of the box, and has a light entrance surface and a light exit surface, and receives light projected from a light source through the light entrance surface.
- a total reflection type Fresnel lens sheet that emits light from a light exit surface includes a plurality of prisms provided on a light entrance surface and having a refractive surface and a total reflection surface, and refracts light from a light source on a refraction surface. The angle between the refraction surface and the total reflection surface of each prism is almost the same, and the angle between the refraction surface of the prism farthest from the light source and the sheet surface is approximately the same.
- a transmissive screen comprising a Fresnel lens sheet characterized by being substantially perpendicular, and a light diffusing element for diffusing light integrally provided in the Fresnel lens sheet;
- a projection device for projecting an image light at a steep angle from a rear transmissive display device characterized by comprising a.
- the present invention has a box forming an exterior, and is mounted on a window provided on a front surface of the box, and has a light entrance surface and a light exit surface, and receives light projected from a light source through the light entrance surface.
- a total-reflection type Fresnel lens sheet that emits light from the light-entering surface includes a plurality of prisms having a refractive surface and a total reflection surface. The angle between the refraction surface and the total reflection surface of each prism is substantially the same, and the angle between the refraction surface of the prism farthest from the light source and the sheet surface is substantially a right angle.
- a transmissive screen comprising: a Fresnel lens sheet; a light diffusing element installed on the light exit surface side of the Fresnel lens sheet to diffuse light; and And a projection device that projects video light from a rear surface of the transmission screen at a steep angle.
- FIG. 1 is a sectional view showing an example of a Fresnel lens sheet according to the first embodiment of the present invention.
- FIG. 2A is a partially enlarged view of the Fresnel lens sheet of FIG.
- FIG. 2B is a partially enlarged view of the Fresnel lens sheet of FIG.
- FIG. 3 is a manufacturing process diagram illustrating an example of a method for manufacturing a Fresnel lens sheet of the present invention.
- FIG. 4A is a diagram illustrating a method for cutting a molding die of a Fresnel lens sheet according to the present invention.
- FIG. 4B is a diagram illustrating a method for cutting a molding die of the Fresnel lens sheet of the present invention.
- FIG. 5 is a perspective view showing an example of the transmission screen according to the first embodiment of the present invention.
- FIG. 6 is a perspective view showing another example of the transmission screen according to the first embodiment of the present invention.
- FIG. 7 is a perspective view showing another example of the transmission screen according to the first embodiment of the present invention.
- FIG. 8 is a perspective view showing another example of the transmission screen according to the first embodiment of the present invention.
- FIG. 9 is a perspective view showing another example of the transmission screen according to the first embodiment of the present invention.
- FIG. 10 is a cross-sectional view illustrating an example of the rear transmission type display device according to the first embodiment of the present invention.
- FIG. 11A is a diagram illustrating the transmission efficiency of the Fresnel lens sheet of the present invention.
- FIG. 11B is a diagram illustrating the transmission efficiency of the Fresnel lens sheet of the present invention.
- FIG. 12A is a partially enlarged view showing an example of a Fresnel lens sheet according to the second embodiment of the present invention.
- FIG. 12B is a partially enlarged view showing an example of the Fresnel lens sheet according to the second embodiment of the present invention.
- FIG. 13 is a sectional view showing an example of a Fresnel lens sheet according to the third embodiment of the present invention.
- FIG. 14 is a cross-sectional view showing another example of the Fresnel lens sheet according to the third embodiment of the present invention.
- FIG. 15 is a cross-sectional view showing another example of the Fresnel lens sheet according to the third embodiment of the present invention.
- FIG. 16 is a cross-sectional view showing a conventional Fresnel lens sheet.
- Fig. 17A is a partially enlarged view of the Fresnel lens sheet of Fig. 1.6.
- FIG. 17B is a partially enlarged view of the Fresnel lens sheet of FIG.
- FIG. 18 is a diagram showing stray light in the Fresnel lens sheet.
- FIG. 1 is a cross-sectional view in the thickness direction of the Fresnel lens sheet according to the first embodiment
- FIGS. 2A and 2B are partially enlarged views of portions A and B in FIG.
- the Fresnel lens sheet 1 shown in FIGS. 1 and 2A and 2B has a light entrance surface la and a light exit surface lb, and allows light projected from the light source M to enter the light entrance surface 1a. It is a total reflection type that emits light from the light emitting surface 1b.
- a plurality of prisms 2 are formed on the light incident surface 1 a side of the Fresnel lens sheet 1.
- the prism 2 has a refracting surface 3 for transmitting the light X incident on the Fresnel lens sheet 1 with refraction, and a refracting surface. And a total reflection surface 4 for totally reflecting the light refracted at 3 to the observer side.
- the refracting surface 3 and the total reflection surface 4 intersect at an angle ⁇ , and this angle is set to the same angle in all the prisms 2.
- the refracting surface 3 and the total reflection surface 4 are formed so as to form an angle ⁇ and an angle] 3 with the sheet surface (reference surface of the Fresnel lens sheet 1) 1c, respectively.
- This angle is set to an angle at which light incident on the total reflection surface 4 via the refraction surface 3 is reflected (total reflection) in a direction perpendicular to the sheet surface 1c.
- the incident angle 0 (the angle between the normal 1 d of the Fresnel lens sheet surface and the incident light) at which the light projected from the projection device ⁇ ⁇ ⁇ as the light source enters the Fresnel lens sheet 1 is the projection device .M Is smaller at the prism P1 closest to the projector M, and becomes larger as the distance from the projector M increases.Therefore, the angle 3 becomes maximum at the prism P1 closest to the projector M, and becomes smaller as the distance from the projector M becomes smaller. It is set as follows. In addition, since the angle ⁇ is constant as described above, the angle ⁇ is minimum at the prism ⁇ 1 closest to the projector ⁇ , and gradually increases as the distance from the projector ⁇ increases. In the Fresnel lens sheet of the present invention, the angle ⁇ formed by the prism 2 farthest from the projection device ⁇ is set to a substantially right angle (90 °).
- the Fresnel lens sheet 1 is formed by, for example, an ultraviolet / radiation curable resin method.
- a method for producing a Fresnel lens sheet by an ultraviolet / radiation-curable resin method will be described.
- Fig. 3 shows the manufacturing process of the Fresnel lens sheet.
- a mold manufacturing process which is a preparation process for manufacturing the Fresnel lens sheet 1 Perform As shown in Fig. 4, in the mold manufacturing process, mold materials 11 such as aluminum, brass, copper, and steel are engraved into a shape corresponding to the Fresnel lens sheet 1 to form a mold for the Fresnel lens sheet. To manufacture. The engraving of the mold material 11 is performed using a cutting tool 12. This byte 12 has an edge angle substantially equal to the angle ⁇ at which the refraction surface 3 and the total reflection surface 4 of the prism 2 of the Fresnel lens sheet 1 intersect.
- the tool 12 When cutting the prism portion farthest from the projection device ⁇ using the byte 12, the tool 12 is set upright with respect to the surface of the mold material 11, and the tool 12 is inclined. Cut the total reflection surface with the surface 12a and the refraction surface with the upright surface 12b of the cutting tool 12 (see Fig. 4A). Subsequently, when processing the prism portion located adjacent to the prism portion on the side of the projection device, the cutting tool 12 is rotated by an angle obtained by subtracting the angle ⁇ formed by the refracting surface 3 of the prism 2 from 90 °. Cutting by inclining in the direction of the surface (the direction of the arrow shown in Fig. 4 ⁇ ) (see Fig. 4 ⁇ ).
- the cutting tool 12 may be gradually inclined toward the rear surface to perform the cutting. Therefore, when cutting the mold for molding the Fresnel lens 1 according to the present invention, it is necessary to perform cutting using a plurality of bytes 12 or to cut one prism part in multiple passes. Therefore, efficient mold processing can be performed. Note that cutting may be performed in multiple passes in order to secure a high-precision finished surface.However, even in this case, the number of passes is smaller than the number of passes required to obtain equivalent finished surface accuracy in the past. Thus, a highly accurate finished surface can be obtained.
- a resin coating step is performed.
- the above-mentioned molding die is coated with an ultraviolet / radiation curable resin, which can be performed by a roll coating method, a gravure method, a dispenser method, a curtain coating method, a die coating method, or the like.
- a substrate laminating step is performed. In the substrate lamination process, a substantially transparent substrate that transmits ultraviolet light / radiation is laminated on the ultraviolet / radiation-curable resin applied in the resin application process, and the ultraviolet radiation-curable resin is pressed by a pressure roller. And the substrate.
- a resin curing step is performed.
- ultraviolet light is applied
- the Z-ray radiation is directed toward the UV-Z radiation-curable resin to cure the UV-Z radiation-curable resin.
- a release step is performed.
- the cured ultraviolet ray Z radiation cured resin is released from the mold.
- the angle ⁇ between the refraction surface 3 of the prism 2 of the Fresnel lens sheet 1 and the sheet surface 1c is determined as described above. Since the angle is set so that it does not exceed 90 °, there is no possibility that the resin and the mold are engaged and do not come off.
- the manufacturing method is not limited to this, and the manufacturing method may be, for example, a hot press method. Even if it is manufactured by the hot press method, efficient mold processing can be performed in the mold manufacturing process, and the mold can be easily and safely released in the mold release process. / Same as in the case of the radiation curing resin method.
- FIG. 5 is a perspective view in the thickness direction of the transmission screen according to the first embodiment.
- the transmission screen 21 shown in FIG. 5 is formed by arranging a lenticular lens sheet 22 as a light diffusing element on the light exit surface 1 b side of the Fresnel lens sheet 1.
- the lenticular lens sheet 22 is formed by arranging vertically extending semi-cylindrical lenses 23 a and 23 b on the light incident surface 22 a side and the light exit surface 22 b side, respectively.
- a black light absorbing layer 24 is provided between the lenses 23 b formed on the light exit surface 22 b side.
- the lenticular lens sheet 22 formed in this way diffuses the light incident from the projector and adjusted substantially perpendicularly to the sheet surface by the Fresnel lens sheet 1 in the horizontal direction by the lenses 23a and 23b.
- it has a function of providing an image having a wide viewing angle in the horizontal direction, and providing a high-contrast image by absorbing external light incident from the light emitting surface side with the light absorbing layer 24.
- the lenticular lens sheet 22 has a horizontal diffusion half-value angle of 10 ° or more, preferably 20 °. It is formed so as to be as described above.
- the horizontal diffusion half-value angle is a transmission type screen.
- the brightness (luminance) is half the brightness measured in the brightest place (normally, the vertical direction (front) of the lenticular lens sheet). Is the angle in the horizontal direction.
- a transmissive screen 25 may be formed using a lenticular-lens sheet 26 as shown in FIG.
- the lenticular lens sheet 26 is formed by arranging a vertically extending semi-cylindrical lens 27 only on the light incident surface 26a side. Further, a light absorbing layer 28 is formed on the surface of the lens 27.
- the lenticular lens sheet 26 formed as described above diffuses the light incident from the projector M and adjusted substantially perpendicularly to the sheet surface 1 c by the Fresnel lens sheet 1 in the horizontal direction by the lens 27.
- the light-absorbing layer 28 has a function of providing an image having a wide viewing angle in the horizontal direction, and absorbing high-contrast images by absorbing external light incident from the light exit surface 26b side with the light absorption layer 28.
- a transmission screen can be formed by providing a light diffusing element inside the first Fresnel lens sheet.
- the diffusing element the diffusing material 29 dispersed in the Fresnel lens sheet 1 as shown in FIG. 7 and the light emitting surface 1 b side of the Fresnel lens sheet 1 as shown in FIG.
- the diffusing material 29 and the lenticular lens 30 or the lenticular lens 31 having a trapezoidal cross section may be used together, or each may be used alone. . .
- FIG. 10 is a side sectional view of the rear transmission display device according to the first embodiment.
- the rear transmissive display device 41 shown in FIG. 10 includes a box 42 constituting an exterior and a front surface of the box 4 ′ 2. It is mainly composed of a transmissive screen 21 arranged above and a projection device 43 installed in a box 42 for projecting an image from obliquely below the rear of the transmissive screen 21.
- the box 42 is made of, for example, resin, metal, or the like, and is formed with a window 42 a for installing the transmission screen 21 above the front surface. Also, in order to enhance the design, the outer surface is subjected to a decoration treatment such as coloring as necessary.
- the transmissive screen 21 is formed as described above, and is usually formed in a horizontally long rectangle having an aspect ratio of 3: 4 (standard type) or 9:16 (wide type).
- the transmission screen 21 is attached to the window 42 a of the box 42 so that the front side (light emitting surface) is outside the box 42.
- the projection device 43 includes an optical device such as a CRT or an LCD, and a projection lens for enlarging an optical image formed thereby, and is a device for enlarging and projecting an image on the transmission screen 21 from behind. .
- the projection device 43 is installed so that the image light projected by the projection device 43 is reflected by the total reflection surface 4 of the Fresnel lens sheet 1 of the transmission type screen 21 in a direction perpendicular to the sheet surface. .
- the angle formed by the total reflection surface 4 of the Fresnel lens sheet 1 so that the image light projected from the installation position of the projection device 3 3 is reflected in a direction perpendicular to the sheet surface of the Fresnel lens sheet 1. Is set.
- the rear transmissive display device 41 configured as described above causes the image light projected from the projection device 43 to enter the transmissive screen 21 at a steep angle, and is first refracted by the refraction surface 3 of the Fresnel lens sheet 1. Then, the light is totally reflected by the total reflection surface 4 and adjusted to light perpendicular to the sheet surface, and further diffused in the horizontal direction by the lenticular lens sheet 22 to emit image light to the observer side. .
- the Fresnel lens sheet 1 has an angle ⁇ between the refraction surface 3 and the sheet surface 1 c of the prism ⁇ 2 farthest from the projection device 43 and the sheet surface 1 c as a substantially right angle (90 °). Since the maximum value is set within a range that does not interfere with the manufacture of the projector, the angle S formed by the prism 2 close to the projection device 43 is also increased, and the rate of occurrence of stray light is reduced. That is, as shown in FIG. 11A and FIG.
- the prism 2 of the Fresnel lens sheet 1 of the present invention in which the maximum angle ⁇ between the refracting surface 3 and the sheet and the surface 1c is 90 °.
- the ratio of stray light (Fig. 11A) is the ratio of stray light in the prism 2 of the conventional Fresnel lens sheet 1 in which the maximum angle ⁇ between the refracting surface 3 and the sheet surface 1c is not 90 ° ( Figure 11B).
- the angle ⁇ in the prism ⁇ 2 farthest from the projection device ⁇ ⁇ ⁇ is 90 °, and the angle ⁇ is relatively large even in the prism ⁇ 1 close to the projection device ⁇ .
- the rear transmission type projection device 41 can provide a high-contrast image.
- the present invention is not limited to this.
- the second embodiment uses a Fresnel lens sheet formed so that the light output direction of a prism located far from the projection device is slightly inclined toward the projection device from a direction perpendicular to the sheet surface. is there.
- the Fresnel lens sheet has the same configuration, operation and effects as the Fresnel lens sheet according to the first embodiment. It is the same as in the first embodiment in that the method of manufacturing and the method of using the Fresnel lens sheet to form a transmission screen and a rear transmission projection apparatus. Therefore, only the configuration of the Fresnel lens sheet according to the second embodiment will be described below.
- FIGS. 12A and 12B are cross-sectional views in the thickness direction of the Fresnel lens sheet according to the second embodiment.
- parts having the same configuration as the Fresnel lens sheet 1 shown in FIG. 1 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
- the Fresnel lens sheet 51 has a light entrance surface 51a and a light exit surface 51b, and at least a prism P2 farthest from the projector M.
- the angle ⁇ formed between the total reflection surface 4 and the sheet surface 51c is slightly smaller than the direction perpendicular to the sheet surface 51c by an angle of 7 degrees. It is set to be in the direction inclined to the ⁇ side. As described above, when the reflection direction is inclined toward the projection device, the angle ⁇ formed is larger than when the reflection direction is a perpendicular direction, and therefore, the angle formed between the refraction surface 3 and the total reflection surface 4 becomes larger. Can be smaller. If the angle ⁇ can be reduced, the rate of occurrence of stray light can be reduced.
- the angle ⁇ between the refracting surface 3 and the sheet surface 51c in the prism 2 is 90 °.
- the reflection direction may be inclined toward the projection device only in the prism ⁇ ⁇ 2 farthest from the projection device ⁇ , but it is preferable that the reflection direction be a certain distance from the position farthest from the projection device, for example, within a range of about 60 O mm. It is preferable to set an angle 8 such that the reflection direction of a certain prism 2 is inclined to the projection device side. With this setting, the angle ⁇ formed by the prism 2 in this region can be easily reduced to 90 ° or less. In the prism P1, the light emission direction is perpendicular to the sheet surface 51c.
- the third embodiment is an embodiment using a Fresnel lens sheet formed by forming a coating layer on the surface of the Fresnel lens sheet according to the first embodiment, and further dispersing a diffusing material in the Fresnel lens sheet.
- the coating layer is formed and the diffusing material is separated, it has the same configuration, operation and effect as the Fresnel lens sheet according to the first embodiment, and a method for manufacturing the Fresnel lens sheet.
- the use of the Fresnel lens sheet to form a transmission screen and a rear transmission projection apparatus is also the same as in the first embodiment. Therefore, only the configuration of the Fresnel lens sheet according to the third embodiment will be described below.
- FIG. 13 is a cross-sectional view in the thickness direction of the Fresnel lens sheet according to the third embodiment.
- the Fresnellen sheet 61 has a light incident surface 61 a and a light exit surface 61 b, and a coating layer 62 is formed on the light incident surface 61 a side. Is done.
- the coating layer 62 is formed of a substantially transparent material having a smaller refractive index than the material forming the prism 2. The coating layer 62 thus formed reduces the reflection of the image light incident from the projection device M.
- the Fresnel lens sheet 61 includes a diffusion layer 64 in which a diffusion material 63 as a light diffusion element is dispersed. I have.
- the diffusion layer 64 prevents a double image caused by light (stray light) Y that has not reached the reflecting surface 4 after being refracted by the refracting surface 3.
- the stray light Y is refracted by the refracting surface 3 and then reflected by the light-emitting surface 6 lb, reaches the refracting surface 3 and the total reflection surface 4 again, and then refracts by the refraction surface 3 and the total reflection surface 4.
- the light is refracted or reflected and emerges from the light exit surface 61b to cause a double image problem.
- the diffusion layer 64 in which the diffusion material 63 is dispersed as described above, the stray light Y is diffused while traveling between the refraction surface 3 and the total reflection surface 4 and the light exit surface.
- the diffusing material 63 is formed of, for example, an organic material such as acrylic, styrene, or melamine, or an inorganic material such as glass, titanium oxide, coated mica, or Zn. Further, the dispersion amount of the diffusion material 63 is adjusted so that the half value angle of diffusion becomes 10 ° or less, preferably 5 ° or less, and more preferably about 2 °.
- a horizontal lenticular lens 65 as a light diffusion element may be disposed on the light exit surface 6lb as shown in FIG.
- the intensity of the stray light Y finally emitted from the light exit surface can be reduced.
- the problem of a double image can be reduced.
- a light absorbing plate (light absorbing layer) 66 as a light absorbing element is arranged so as to be perpendicular to the light emitting surface 61b. Is also good. In this case, normal light (incident light other than stray light) X travels in the direction perpendicular to the light exit surface, Although not incident on the absorption plate 66, the stray light Y travels in an oblique direction with respect to the light exit surface 61b, and is incident upon and absorbed by the light absorption plate 66, so that the light exits from the light exit surface 61b. The amount of stray light Y can be reduced, and the problem of double image can be solved.
- the light absorbing plate 66 may be formed only of a light absorbing material such as carbon black, or may be formed of a plate material whose surface is coated with a light absorbing material such as carbon black.
- a coloring component as a light absorbing element may be added to the material constituting the Fresnel lens sheet 61.
- the coloring component a black pigment or the like can be considered. Since the coloring component also absorbs regular light, it is desirable to adjust the young coloring component so that the absorption rate is 50% or less.
- the Fresnel lens sheets shown in the following Examples 1 and 2 and Comparative Examples 1 and 2 were molded, and the moldability was evaluated.
- these Fresnel lens sheets are arranged upright, and light is projected from a projector arranged at a height of 20 O mm below the lower end thereof and at a distance of 285 mm from the rear surface thereof.
- the transmission efficiency (the ratio of the amount of incident light and the amount of light reflected by the total reflection surface and transmitted from the sheet) to the prism (hereinafter referred to as the innermost prism) in the position closest to the sheet was evaluated. Specifically, the transmission efficiency was determined as follows. .
- Example 1 The size of the Fresno lens sheet was 762 mm in height and 1016 mm in width (50 inches, aspect ratio 3: 4), and the refractive index of the resin forming it was 1.55.
- the angle between the total reflection surface and the sheet surface was set so that the direction of reflection at the total reflection surface was perpendicular to the sheet surface.
- the pitch of the prisms is (the distance between the peaks of adjacent prisms) 0.1 mm, and the angle between the refracting surface and the sheet surface of the prism farthest from the projector (hereinafter referred to as the outermost prism in this embodiment).
- ⁇ was set to 90 °.
- the size of the Fresnel lens sheet was 762 mm long and 1016 mm wide, and the refractive index of the resin forming it was 1.55.
- the angle of reflection at the total reflection surface of the outermost prism should be 5 ° downward from the perpendicular to the sheet surface, and the downward angle of the reflection direction should gradually decrease as the prism approaches the projector.
- the downward angle of the reflection direction at the prism located 588 mm from the outer prism and closer to the projector was set to 0 °.
- the angle between the total reflection surface and the sheet surface] 3 was set so that the downward angle of the reflection direction was 0 ° for all subsequent prisms (closer to the projector).
- the pitch of the prisms (distance between the peaks of adjacent prisms) was 0.11 mm, and the angle ⁇ between the refracting surface and the sheet surface of the outermost prism was set to 90 °.
- the size of the Fresnel lens sheet was 762 mm in length and 10.16 mm in width (50 inches, aspect ratio 3: 4), and the refractive index of the resin forming it was 1.55.
- the angle between the total reflection surface and the sheet surface was set so that the direction of reflection on the total reflection surface was perpendicular to the sheet surface.
- the pitch of the prisms (the distance between the peaks of adjacent prisms) was 0.1 lmm, and the angle ⁇ between the refracting surface and the sheet surface of the outermost prism was set to 61.6 °.
- the size of the Fresno lens sheet was 762 mm long and 1016 mm wide (50 inches, aspect ratio 3: 4), and the resin forming it was 1.55 in refractive index.
- Angle with the sheet surface] 3 was set.
- the pitch of the prisms (the distance between the peaks of adjacent prisms) was set to 0.086 mm, and the angle ⁇ between the refracting surface and the sheet surface of the innermost prism was set to 100.3 °.
- Example 1 the angle ⁇ formed by the refraction surface and the angle formed by the total reflection surface were all 90 ° or less in all the prisms, so that the Fresnel lens sheet was easily removed from the mold during molding.
- the moldability was good.
- the transmission efficiency at the innermost prism was 64.8%, which was considerably better than the transmission efficiency of the conventional Fresnel lens sheet (for example, Comparative Example 1) which emphasized the moldability.
- Example 2 the angle ⁇ formed by the refracting surface and the angle formed by the total reflection surface were all 90 ° or less in all the prisms, so that the Fresnel lens sheet was easily removed from the mold during molding. It could be removed and the moldability was good.
- the transmission efficiency in the innermost prism was 63.2%, which was about 4% higher than that of Example 1, and was a more favorable value.
- the Fresnel lens sheet of the present invention is configured as described above, it is possible to obtain the effect that the ratio of occurrence of stray light is small and the transmission efficiency can be maintained high while securing the moldability. Also, use this Fresnel lens sheet And a rear-transmission display device were formed, making it easy to manufacture these devices, or a transmission screen with high transmission efficiency or a thin, high-contrast transmission screen that can provide high contrast images. It can be a display device.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Projection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/513,023 US7277227B2 (en) | 2002-09-24 | 2003-09-24 | Fresnel lens sheet, transmission screen provided with the same and rear projection display |
JP2004539500A JP4044931B2 (ja) | 2002-09-24 | 2003-09-24 | フレネルレンズシート、透過型スクリーン及び背面透過型表示装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002277877 | 2002-09-24 | ||
JP2002-277877 | 2002-09-24 |
Publications (1)
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WO2004029677A1 true WO2004029677A1 (ja) | 2004-04-08 |
Family
ID=32040413
Family Applications (1)
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PCT/JP2003/012152 WO2004029677A1 (ja) | 2002-09-24 | 2003-09-24 | フレネルレンズシート、これを用いた透過型スクリーン、及び背面透過型表示装置 |
Country Status (5)
Country | Link |
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US (1) | US7277227B2 (ja) |
JP (1) | JP4044931B2 (ja) |
KR (1) | KR100697836B1 (ja) |
CN (1) | CN100449333C (ja) |
WO (1) | WO2004029677A1 (ja) |
Cited By (3)
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JP2005326573A (ja) * | 2004-05-13 | 2005-11-24 | Ricoh Co Ltd | 背面投射型画像表示装置・背面投射スクリーン |
JP2006189526A (ja) * | 2005-01-04 | 2006-07-20 | Hitachi Ltd | 画像表示装置、及びそれに用いるスクリーン並びにフレネルレンズシート |
JP2018013634A (ja) * | 2016-07-21 | 2018-01-25 | 大日本印刷株式会社 | 透過型スクリーン、背面投射型表示装置 |
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JP4089682B2 (ja) * | 2004-11-05 | 2008-05-28 | ソニー株式会社 | フレネルレンズシート,透過型スクリーン及び背面投射型表示装置 |
WO2006080518A1 (ja) * | 2005-01-31 | 2006-08-03 | Kuraray Co., Ltd. | 透過型スクリーン及び塗布装置 |
US7522339B2 (en) * | 2005-11-21 | 2009-04-21 | Hewlett-Packard Development Company, L.P. | High contrast projection systen |
US20110043542A1 (en) * | 2009-07-06 | 2011-02-24 | Tsuyoshi Kashiwagi | Display device |
TW201202837A (en) * | 2010-07-09 | 2012-01-16 | Coretronic Corp | Projection screen and manufacturing method thereof |
KR20130022987A (ko) | 2011-08-26 | 2013-03-07 | 삼성전자주식회사 | 프로젝션용 스크린 및 그를 포함하는 프로젝션 시스템 |
US8599483B1 (en) | 2012-06-05 | 2013-12-03 | 3M Innovative Properties Company | High angle rear projection system |
FR3008199B1 (fr) * | 2013-07-05 | 2016-12-02 | Thales Sa | Dispositif de visualisation comportant un ecran transparent visible sous fort eclairement |
KR102255145B1 (ko) * | 2014-12-04 | 2021-05-21 | 다이니폰 인사츠 가부시키가이샤 | 반투과형 반사 시트, 도광판 및 표시 장치 |
JP6156671B2 (ja) * | 2015-02-26 | 2017-07-05 | 大日本印刷株式会社 | 透過型スクリーン及びそれを用いたヘッドアップディスプレイ装置 |
WO2018168326A1 (ja) * | 2017-03-16 | 2018-09-20 | ソニー株式会社 | 光学部品、光学部品の製造方法、及び画像表示装置 |
CN110376742A (zh) * | 2017-03-23 | 2019-10-25 | 华为机器有限公司 | 近眼显示器及近眼显示系统 |
US10795059B2 (en) | 2017-07-20 | 2020-10-06 | Wavefront Technology, Inc. | Ultra thin Fresnel lenses and other optical elements |
CN109388013B (zh) * | 2017-08-04 | 2022-02-11 | 深圳光峰科技股份有限公司 | 投影屏幕和投影系统 |
CN110083005A (zh) | 2018-01-23 | 2019-08-02 | 台湾扬昕股份有限公司 | 背投屏幕 |
TWI686661B (zh) * | 2018-04-20 | 2020-03-01 | 億立材料有限公司 | 可多角度投影成像之投影幕 |
US10502963B1 (en) * | 2018-07-16 | 2019-12-10 | Facebook Technologies, Llc | Immersed fresnel structure with curable liquid polymer |
CN211086909U (zh) * | 2019-11-20 | 2020-07-24 | 深圳光峰科技股份有限公司 | 菲涅尔膜片及显示组件 |
CN113183447B (zh) * | 2021-04-29 | 2022-11-25 | 青岛海信激光显示股份有限公司 | 菲涅尔微结构模具、菲涅尔膜片制备方法及正投影屏幕 |
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- 2003-09-24 JP JP2004539500A patent/JP4044931B2/ja not_active Expired - Fee Related
- 2003-09-24 KR KR1020047019485A patent/KR100697836B1/ko not_active IP Right Cessation
- 2003-09-24 WO PCT/JP2003/012152 patent/WO2004029677A1/ja active Application Filing
- 2003-09-24 US US10/513,023 patent/US7277227B2/en not_active Expired - Fee Related
- 2003-09-24 CN CNB038153785A patent/CN100449333C/zh not_active Expired - Fee Related
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JPH09292821A (ja) * | 1996-04-24 | 1997-11-11 | Dainippon Printing Co Ltd | ホログラム照明用プリズムシート組立体 |
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JP2018013634A (ja) * | 2016-07-21 | 2018-01-25 | 大日本印刷株式会社 | 透過型スクリーン、背面投射型表示装置 |
Also Published As
Publication number | Publication date |
---|---|
US20050180004A1 (en) | 2005-08-18 |
KR100697836B1 (ko) | 2007-03-20 |
US7277227B2 (en) | 2007-10-02 |
JP4044931B2 (ja) | 2008-02-06 |
CN100449333C (zh) | 2009-01-07 |
KR20050034646A (ko) | 2005-04-14 |
CN1666116A (zh) | 2005-09-07 |
JPWO2004029677A1 (ja) | 2006-01-26 |
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