WO2006030823A1 - 視野角制御シート及び表示装置 - Google Patents
視野角制御シート及び表示装置 Download PDFInfo
- Publication number
- WO2006030823A1 WO2006030823A1 PCT/JP2005/016928 JP2005016928W WO2006030823A1 WO 2006030823 A1 WO2006030823 A1 WO 2006030823A1 JP 2005016928 W JP2005016928 W JP 2005016928W WO 2006030823 A1 WO2006030823 A1 WO 2006030823A1
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- WO
- WIPO (PCT)
- Prior art keywords
- viewing angle
- wedge
- angle control
- control sheet
- light
- 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
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
Definitions
- the present invention is preferably installed on the front face of a display and preferably has a display performance, particularly a function for preventing a decrease in performance due to a decrease in contrast when external light hits the display, and an effective light of a display.
- the present invention relates to a viewing angle control sheet having a function of widening the viewing angle by diffusing and a display device using the same.
- OLED Organic light-emitting diodes ⁇ Display
- LCD liquid crystal display
- OLED Organic light-emitting diodes ⁇ Display
- LCD liquid crystal display
- FIG. 10 a louver type viewing angle control sheet as shown in FIG. 10 has been developed and used.
- the louver-type viewing angle control sheet has an effect of increasing the contrast by blocking outside light.
- a viewing angle control sheet that reduces the occurrence of double images (referred to as ghosts) in the louver is disclosed.
- FIG. 5 of Patent Document 1 describes an illustration of a ghost.
- Patent Document 1 Japanese Patent Publication No. 58-47681
- Patent Document 2 Japanese Patent Publication No. 6-504627
- Patent Document 3 Japanese Patent Laid-Open No. 9-311206
- the conventional louver-type viewing angle control sheets described in Patent Documents 1 to 3 simply cut the image light in an oblique direction, and are used for displays such as high-definition LCDs. First, reduce the diffused light of the image-side diffused light source that should reach the viewer side. As a result, there is a problem that the brightness of the screen is lowered.
- the present invention suppresses image contrast reduction due to external light, suppresses the occurrence of ghosts, improves contrast, and effectively uses diffused light from a video source to reduce screen brightness. It is an object to provide a viewing angle control sheet having a wide viewing angle. Means for solving the problem
- the lens portions having a trapezoidal cross-sectional shape are arranged at a predetermined interval, and the wedge-shaped portion between the adjacent lens portions is the same as or different from the lens portion.
- the wedge-shaped portion has a tip on the viewer side and a bottom surface on the image source side.
- the refractive index of the material constituting at least the inclined surface portion is Nx, and the material constituting the lens portion is provided.
- a viewing angle control sheet wherein the wedge-shaped section has a wide bottom surface on the image source side.
- the invention of claim 2 is the viewing angle control sheet of claim 1, wherein when the angle formed by the inclined surface portion of the wedge-shaped portion and the normal line of the light exit surface is ⁇ , ⁇ force is in the range of 3 ⁇ 4 degrees to 15 degrees. In the present invention, if the ⁇ force is less than 3 ⁇ 4 degree, the diffused light does not reach the front side of the observation side, and the brightness improvement effect cannot be obtained. On the other hand, if ⁇ exceeds 15 degrees, a ghost is generated. . In order to maintain the front luminance by using the viewing angle control sheet, 0 to 3 degrees to 15 degrees is a preferable range.
- the invention of claim 3 is the viewing angle control sheet of claim 1 or 2, characterized in that the wedge-shaped portion is a substantially isosceles triangle.
- the invention according to claim 4 is the viewing angle control sheet according to any one of claims 1 to 3, wherein the angle formed by the inclined portion and the side surface of the viewer is an image. It is characterized by having a curved and / or polygonal cross-sectional shape so that it differs on the source side and the observer side.
- the invention of claim 5 is the viewing angle control sheet according to any one of claims 1 to 4, wherein the wedge-shaped portion has a light absorption effect. To do.
- the invention of claim 6 is the viewing angle control sheet of claim 5, characterized in that the wedge-shaped portion is filled with a material to which light absorbing particles are added. To do.
- the invention of claim 7 is the viewing angle control sheet according to claim 6, wherein the wedge-shaped part has a wide bottom surface on the image source side, and the light absorption
- the average particle size of the particles is 1 ⁇ m or more.
- the invention according to claim 8 is the viewing angle control sheet according to claim 6 or 7, wherein the amount of light absorbing particles added in the material filled in the wedge-shaped portion Is 10 to 50% by volume.
- the viewing angle control sheet of any one of claims 1 to 8 is one sheet or substantially orthogonal to the viewer side of the image source.
- the invention according to claim 10 is the viewing angle control sheet according to any one of claims 1 to 9, wherein at least one side is provided with an AR, AS, AG, touch sensor. One of these, or a plurality of additional functions among them is added.
- the invention of claim 11 is the display device characterized in that the viewing angle control sheet according to any one of claims 1 to 10 is bonded. Is a solution.
- the lens portions having a trapezoidal cross-sectional shape are arranged at a predetermined interval, and the wedge-shaped tip having a wide bottom surface on the image side is provided as the cross-sectional shape of the wedge-shaped portion between adjacent lens portions.
- a control sheet can be obtained.
- the viewing angle control sheet of the present invention it is possible to suppress a decrease in contrast of an image due to external light and to suppress generation of a ghost. Ma
- the viewing angle control sheet of the present invention it is possible to obtain a viewing angle control sheet having a wide viewing angle by effectively using the diffused light of the image source power to suppress a decrease in screen brightness.
- FIG. 1 is a view showing a cross section in one direction of a viewing angle control sheet S1 that is useful in the first embodiment of the present invention.
- an image light source is arranged on the left side of the drawing to emit diffused light
- an observer is located on the right side of the drawing.
- the viewing angle control sheet S1 is formed by laminating the image source side base sheet 11, the lens unit 12, and the observer side base sheet 13 in this order from the image source side to the observer direction.
- the lens unit 12 is made of a material having a refractive index of Nyl.
- the cross-sectional shape of the portion sandwiched between the hypotenuses of the upper and lower adjacent lens portions 12 and 12 is the wide bottom surface 17 on the image source side and the viewer side facing the viewer side. It has a wedge shape having a top 18 formed in a convex curved surface having a width.
- the wedge-shaped portion is filled with a material having a refractive index Nxl lower than the refractive index Nyl of the lens portion 12.
- this wedge-shaped part is called “wedge-shaped part 14”.
- the wedge-shaped portion 14 includes a top portion 18 that is a narrow portion on the viewer side, and a bottom surface 17 on the image source side.
- the ratio between the refractive index Nyl of the lens portion 12 and the refractive index Nxl of the wedge-shaped portion 14 is set within a predetermined range in order to obtain the optical characteristics of the viewing angle control sheet S1. Further, the angle between the inclined surface where the wedge-shaped portion 14 and the lens portion 12 are in contact with the normal line V of the light exit surface (a line parallel to the perpendicular incident light with respect to the viewing angle control sheet S1) is formed at a predetermined angle ⁇ . .
- the wedge-shaped portion 14 is colored with a predetermined concentration with a pigment such as carbon or a predetermined dye.
- the image source side base sheet 11 and the observer side base sheet 13 are made of a material having substantially the same refractive index as that of the lens unit 12.
- the outer surface of the observer-side base sheet 13 has at least one function of AR, AS, AG, and touch sensor on the observer side.
- AR is an abbreviation for anti-reflection, and refers to the function of suppressing the reflectance of light incident on the lens surface.
- AS is an abbreviation for anti-static, which means an antistatic function.
- AG is an abbreviation for anti-glare and refers to the anti-glare function of the lens.
- the viewing angle control sheet SI that is useful for the embodiment may have only one of these functions or may have a plurality of functions.
- the optical path of the light that has entered the lens unit 12 of the viewing angle control sheet S1 will be briefly described with reference to FIG.
- the optical paths of the lights L11 to L15 are shown schematically.
- the vertical light L 11 incident on the vicinity of the center of the lens unit 12 from the image source side passes straight through the inside of the viewing angle control sheet S 1 and reaches the observer.
- Incident light L 12 incident near the end of the lens unit 12 at a predetermined angle from the image source side is totally reflected on the slope due to the refractive index difference between the lens unit 12 with a refractive index Nyl and the wedge-shaped unit 14 with a refractive index Nxl. Reflected and emitted as vertical light to the viewer.
- the light L13 incident at a large angle near the edge of the lens unit 12 is also reflected at the slope, and is reflected at a small angle in the opposite direction to that of the incident light.
- Light L14 that directly enters the wedge-shaped portion 14 from the bottom surface 17 enters the inside of the wedge-shaped portion 14. Since the wedge-shaped portion 14 is colored, the light L14 is absorbed by the wedge-shaped portion 14 and does not reach the observer side.
- external light L 15 incident on the inclined surface from the observer side with a small angle of a predetermined angle or less enters the inside of the wedge-shaped portion 14 without being totally reflected by the difference in refractive index between the lens portion 12 and the wedge-shaped portion 14.
- the outside light L 15 is absorbed by the colored wedge 14. Therefore, the contrast of the image according to the visual field of the observer side force is improved. In this way, it is possible to control the viewing angle in the cross-sectional direction, suppress the reduction in luminance, and obtain the viewing angle control sheet S1 with high contrast.
- FIG. 2 is a view showing a cross section in one direction of the viewing angle control sheet S2 according to the second embodiment.
- the image light source is arranged on the left side of the drawing, and the observer is located on the right side of the drawing.
- This viewing angle control sheet S2 is formed by adhering an image source side base sheet 21, a lens unit 22, and an observer side base sheet 23 in order from the image source side to the observer direction.
- the lens unit 22 is made of a material having a refractive index of Ny2.
- the cross-sectional shape sandwiched between the slopes of the lens portions 22 and 22 adjacent to the upper and lower sides has a wide bottom surface 27 on the image source side and a width on the observer side toward the observer side.
- the wedge-shaped part is the refractive index of the lens part 22. Filled with a material having a refractive index Nx2 lower than Ny2.
- the portion having the wedge shape is referred to as “wedge-shaped portion 24”.
- the wedge-shaped portion 24 has a wide bottom surface 27 on the image source side and a top portion 28 on the observer side.
- the ratio between the refractive index Ny2 of the lens portion 22 and the refractive index Nx2 of the wedge-shaped portion 24 is set within a predetermined range in order to obtain the optical characteristics of the viewing angle control sheet S2.
- the angle between the inclined surface where the wedge-shaped portion 24 and the lens portion 22 are in contact with the normal line V of the light exit surface is a predetermined angle ⁇
- the wedge-shaped portion 24 is colored to a predetermined concentration with a pigment such as carbon or a predetermined dye.
- the image source side base sheet 21 and the observer side base sheet 23 are made of a material having substantially the same refractive index as that of the lens portion 22.
- the outer surface of the observer-side base sheet 23 has at least one function of AR, AS, AG, and touch sensor on the observer side. In this embodiment, only one of these functions may be provided or a plurality of functions may be provided.
- the illustrated viewing angle control sheet S2 has a black stripe BS formed on the bottom surface 27 thereof.
- the wedge-shaped portion 24 is filled with a material having a refractive index Nx2 lower than the refractive index Ny2 of the lens portion 22.
- each incident light L21 to L23 from the image source side follows the same optical path as the incident light L11 to L13 in the viewing angle control sheet S1 shown in the first embodiment. .
- the light L24 incident on the black stripe B S on the bottom surface 27 is absorbed by the black stripe BS.
- FIG. 3 shows a viewing angle control sheet S3 that works according to the third embodiment of the present invention.
- the viewing angle control sheet S3 is arranged by adhering the image source side base sheet 31, the lens unit 32, and the observer side base sheet 33 in order from the image source side to the observer side.
- the lens portion 32 is made of a material having a refractive index Ny3.
- the inside of the wedge-shaped portion 34 whose cross-sectional shape sandwiched between the lens portions 32 and 32 adjacent in the vertical direction forms a wedge shape is filled with a substance having a refractive index substantially the same as the refractive index Ny3 of the lens portion 32. Has been.
- the inclined surface and the top 38 of the wedge-shaped portion 34 are formed of a layer 35 (hereinafter referred to as “transparent low-refractive index layer 35” t) having a refractive index Nx3 smaller than Ny3 and being a transparent material. It has been.
- the ratio of the refractive index Ny3 of the lens portion 32 and the refractive index Nx3 of the transparent low refractive index layer 35 is set to a predetermined range in order to obtain the optical characteristics of the viewing angle control sheet S3. Further, the angle formed by the inclined surface where the transparent low refractive index layer 35 and the lens portion 32 are in contact with the normal V of the light exit surface (a line parallel to the perpendicular incident light with respect to the viewing angle control sheet S3) is a predetermined angle ⁇ Formed into
- the lens part 32 is usually made of a material such as epoxy acrylate having ionizing radiation curability.
- the transparent low refractive index layer 35 is formed of a material having a refractive index Nx3 lower than the refractive index Ny3 of the lens portion 32.
- the wedge-shaped portion 34 is colored with a predetermined concentration with carbon, a pigment, a predetermined dye, or the like.
- the image source side base sheet 31 and the observer side base sheet 33 are made of a material having substantially the same refractive index as that of the lens part 32.
- On the outer side surface of the observer-side base sheet 33 at least one function of AR, AS, AG, and touch sensor is provided on the observer side, like the viewing angle control sheet S1 according to the first embodiment. Is provided.
- each of the incident light L3 1 to L33 from the image source side is the incident light L11 to L13 3 in the viewing angle control sheet S1 that is powerful in the first embodiment.
- the light L34 incident on the bottom surface 37 of the colored wedge-shaped part 34 enters the colored wedge-shaped part 34 and is absorbed, and does not reach the observer side.
- external light L35 incident on the observer side force slope with a small angle of less than a predetermined angle is not totally reflected by the difference in refractive index between the lens portion 32 and the transparent low refractive index layer 35, and is not reflected in the wedge-shaped portion 34. Incident light inside.
- the first embodiment Viewing angle control sheet that works well for the same effect as SI, that is, it is possible to control the viewing angle in the cross-sectional direction, and suppresses a decrease in luminance and has a high contrast angle.
- FIG. 4 shows a cross section of a viewing angle control sheet S4 that is useful for the fourth embodiment of the present invention.
- the lens part 42 is made of a material having a refractive index Ny4.
- a transparent material having a refractive index Nx4 smaller than Ny4 hereinafter referred to as ⁇ transparent low refractive index ''
- ⁇ transparent low refractive index '' is formed in a wedge-shaped portion sandwiched between the lens portions 42 and 42 adjacent downward in the drawing. It is filled with a material 46 to which light absorbing particles 49 are added.
- the portion filled with the material 46 to which the light absorbing particles 49 are added is called “wedge shaped portion 44”.
- the wedge-shaped portion 44 has a bottom surface 47 on the image source side and a top portion 48 on the observer side.
- the ratio between the refractive index Ny4 of the lens portion 42 and the refractive index Nx4 of the transparent low refractive index substance is within a predetermined range in order to obtain the optical characteristics of the viewing angle control sheet S4. Is set.
- the angle between the slope V and the normal line V of the light exit surface where the wedge-shaped part 44 and the lens part 42 are in contact is a predetermined angle ⁇
- the lens portion 42 is usually made of a material such as epoxy acrylate having ionizing radiation curability.
- a material such as urethane acrylate having ionizing radiation curability is usually used.
- Commercially available colored resin fine particles can be used as the light absorbing particles 49.
- the image source side base sheet 41 and the observer side base sheet 43 are made of a material having substantially the same refractive index as that of the lens portion 42.
- the observer side base sheet 43 has an AR, AS, AG, and touch sensor on the observer side. Has at least one function.
- FIG. 4 the light paths of the lights L41 to L43 and L44 are It is shown schematically.
- the vertical light L41 incident from the image source side to the vicinity of the central portion of the lens unit 42 passes straight through the inside of the viewing angle control sheet S4 and reaches the observer.
- Light L 42 incident obliquely near the edge of the lens unit 42 is also reflected from the inclined surface due to the difference in refractive index between the lens unit 42 and the transparent low-refractive-index material, and is observed as perpendicular light. Light is emitted to the person.
- the light source L43 has an even larger angle near the end of the lens part 42, and the incident light L43 is totally reflected by the slope, and in an opposite direction to the incident direction, at a smaller angle than the incident angle and close to vertical light.
- the light is emitted to the observer side.
- the light L44 incident on the bottom surface 47 of the wedge-shaped portion 44 enters the wedge-shaped portion 44, is absorbed by the light-absorbing particles 49, and does not reach the observer side.
- external light L45 incident on the inclined surface from the observer side with a small angle of a predetermined angle or less enters the wedge-shaped portion 44 without being totally reflected by the difference in refractive index between the lens portion 42 and the transparent low refractive index material. Shine.
- the outside light L45 is absorbed by the light absorbing particles 49 in the wedge-shaped portion 44. Therefore, the contrast of the image due to the field of view of the observer is improved. In this way, light incident at various angles on the image side is emitted from the observer side in the normal direction of the light exit surface or in a direction close thereto, so that the luminance is suppressed while controlling the viewing angle and the contrast is reduced. High viewing angle control sheet S4 can be obtained.
- FIG. 5 shows a viewing angle control sheet S5 that works according to the fifth embodiment of the present invention.
- the viewing angle control sheet S5 is also arranged by adhering the image source side base sheet 51, the lens unit 52, and the observer side base sheet 53 in this order from the image source side to the observer direction.
- the lens part 52 is made of a material having a refractive index Ny5.
- the portion sandwiched between the vertically adjacent lens portions 52 and 52 forms a wedge-shaped portion 54, and the slope and top portion 58 of the wedge-shaped portion 54 are formed of a transparent material having a refractive index Nx5 smaller than Ny5.
- Layer 55 hereinafter referred to as “transparent low refractive index layer 55”).
- the inside of the wedge-shaped portion 54 is filled with a material in which the light absorbing particles 59 are added to a substance having a refractive index higher than Nx5.
- the ratio of the refractive index Ny5 of the lens unit 52 and the refractive index Nx5 of the transparent low refractive index layer 55 is set to a predetermined range in order to obtain the optical characteristics of the viewing angle control sheet S5. Also transparent low
- the angle between the inclined surface where the refractive index layer 55 and the lens part 52 are in contact with the normal line V of the light exit surface (a line parallel to the normal incident light with respect to the viewing angle control sheet S5) is formed at a predetermined angle ⁇ .
- the lens part 52 is usually made of a material such as epoxy acrylate having ionizing radiation curability.
- the transparent low refractive index layer 55 is formed of a material such as silica having a refractive index lower than that of the transparent resin.
- the light absorbing particles 59 commercially available colored resin fine particles can be used.
- the image source side base sheet 51 and the observer side base sheet 53 are formed of a material having substantially the same refractive index as that of the lens portion 52.
- the observer side of the base sheet 53 also has AR, AS, AG, and touch sensor on the observer side in the present embodiment, similarly to the viewing angle control sheet S1 that can be applied to the first embodiment. Of these, it has at least one function.
- FIG. 5 the optical path of the light that has entered the lens unit 2 of the viewing angle control sheet S5 will be briefly described with reference to FIG. Also in FIG. 5, the optical paths of the lights L51 to L54 are shown schematically.
- the vertical light L51 incident on the image source side near the center of the lens unit 52 passes straight through the inside of the viewing angle control sheet S5 and reaches the observer.
- the light L52 incident at an angle near the end of the lens unit 52 from the image source side is totally reflected on the slope due to the refractive index difference between the lens unit 52 and the transparent low-refractive index layer 54, and is perpendicular. Light is emitted to the observer.
- the light L53 incident at a larger angle near the end of the lens unit 52 from the image source side is totally reflected on the slope, and is perpendicular to the direction opposite to the incident direction with a smaller angle than the incident angle. Light is emitted to the observer side in a state close to light.
- the light L54 that has entered the wedge-shaped portion 54 from the image source side is absorbed by the light absorbing particles 59 and is not reflected and emitted to the observer side.
- the external light L55 incident on the inclined surface with a small angle of a predetermined angle or less on the inclined surface is not totally reflected by the difference in refractive index between the lens part 52 and the transparent low refractive index layer 55, and is not reflected on the wedge-shaped part 54. Incident light inside.
- the external light L55 is absorbed by the light absorbing particles 59 in the wedge-shaped part 54. Therefore, the contrast of the image according to the field of view from the observer side is improved.
- the light absorbing particles 49 and 59 in the viewing angle control sheets S4 and S5 according to the fourth and fifth embodiments preferably have an average particle diameter of 1 m or more. If the size of the light-absorbing particles 49 and 59 is too small, it becomes difficult to fill only the insides of the wedge-shaped parts 44 and 54 during manufacturing.
- the light-absorbing particles 49 and 59 in the viewing angle control sheets S4 and S5 according to the fourth and fifth embodiments are 10 to 50% by volume with respect to the entire volume of the wedge-shaped parts 44 and 54. Preferably there is. By maintaining a strong ratio, it is possible to provide easy manufacturing conditions while maintaining a sufficient light absorption effect.
- Fig. 6 is a schematic cross-sectional view illustrating the state where the light reflected by the slope of the wedge-shaped portion of the viewing angle control sheet reaches the observer side. For comparison, three cases (Fig. 6 (a ) To (c)) are shown in one figure.
- Fig. 6 (a) shows a case where ⁇ takes a small value, and total reflection occurs in the range of ⁇ in the figure.
- Fig. 6 (c) shows a case where ⁇ takes a large value, and the reflected light does not go to the front but totally reflects within the range of C in the figure.
- FIG. 7 is a diagram showing various aspects of the shape of the slope portion of the wedge-shaped portion. This wedge-shaped portion has a shape formed between two adjacent unit lenses.
- Fig. 7 (a) shows the case where the slope is formed by a straight line.
- the angle ⁇ between the slope and the light exit surface normal is constant at any point on the slope.
- Figure 7 (b) shows the case where the slope is formed with a smooth curve.
- Figure 7 (c) shows the case where the slope is composed of two straight lines. In these cases, the angle between the slope and the light emitting surface normal is 0.
- FIG. 8 is a diagram showing an example of the configuration of the viewing angle control sheet of the present invention.
- the viewing angle control sheet S8 shown in FIG. 8 includes a unit lens portion 82 whose horizontal cross-sectional shape is constant in the vertical direction.
- a base sheet 81 is disposed on the image source side, and a base sheet 83 is disposed on the observer side. In the drawing, these three are shown apart for the sake of understanding.
- FIG. 9 shows a configuration of a display device 90 provided with a viewing angle control sheet according to the present invention.
- the lower left side of the page is the image source side
- the upper right side of the page is the viewer side.
- the display device 90 of the present invention includes, in order from the image source side, a liquid crystal display panel 91, a viewing angle control sheet 92 in which lens portions are arranged in a vertical direction, and a viewing angle in which lens portions are arranged in a horizontal direction.
- a control sheet 93 is laminated, and a functional sheet 94 having at least one function of AR, AS, AG, and touch sensor is provided on the observer side.
- the base sheets of the viewing angle control sheet 92 and the viewing angle control sheet 93 are omitted in the drawing.
- the arrangement of the viewing angle control sheet 92 and the viewing angle control sheet 93 may be interchanged. In FIG. 9, these are shown as being separated from each other. This is for the purpose of understanding the drawing, and in fact they are in contact with each other, or are bonded together.
- Example 1 The arrangement of the viewing angle control sheet 92 and the viewing angle control sheet 93 may be interchanged. In FIG. 9, these are shown as being separated from each other. This is for the purpose of understanding the drawing, and in fact they are in contact with each other, or are bonded together.
- FIG. 4 it has a wedge-shaped section whose cross-sectional shape forms a wedge shape, and is not shown further.
- a viewing angle control sheet with a black stripe BS provided on the bottom surface of the wedge-shaped part located on the image light source side was manufactured according to the following specifications.
- the aperture ratio indicates the area ratio of the lens portion excluding the area of the bottom surface of the wedge-shaped portion of the viewing angle control sheet, and the taper angle is the angle ( ⁇ ) that the wedge-shaped inclined surface portion is normal to the light exit surface.
- a viewing angle control sheet was produced under the same conditions as in Example 1 except that the wedge-shaped portion material refractive index was set to 1.54.
- a viewing angle control sheet was produced under the same conditions as in Example 1 except that the wedge-shaped material refractive index was set to 1.554.
- a viewing angle control sheet was produced under the same conditions as in Example 1 except that the wedge-shaped portion material refractive index was set to 1.53.
- a viewing angle control sheet was produced under the same conditions as in Example 1 except that the wedge-shaped material refractive index was 1.558.
- the present invention it is possible to suppress a reduction in image contrast due to external light, to suppress the occurrence of ghosts, to improve contrast, and to effectively utilize diffused light from a video source to reduce screen brightness. Therefore, it is possible to provide a viewing angle control sheet with a wide viewing angle, and thus the industrial applicability is extremely high.
- FIG. 1 is a view showing a cross section in one direction of a viewing angle control sheet in a first embodiment of the present invention.
- FIG. 2 is a view showing a cross section in one direction of a viewing angle control sheet in a second embodiment.
- FIG. 3 is a view showing a cross section in one direction of a viewing angle control sheet in a third embodiment.
- FIG. 4 is a view showing a cross section in one direction of a viewing angle control sheet in a fourth embodiment.
- FIG. 5 is a view showing a cross section in one direction of a viewing angle control sheet in a fifth embodiment.
- FIG. 6 is a schematic cross-sectional view illustrating a state where light reflected by the slope of the wedge-shaped portion of the viewing angle control sheet reaches the observer side.
- FIG. 7 is a diagram showing various aspects of the shape of the slope portion of the wedge-shaped portion.
- FIG. 8 is a diagram showing another example of the configuration of the viewing angle control sheet.
- FIG. 9 A diagram showing an example of the configuration of a display device provided with the viewing angle control sheet of the present invention.
- FIG. 10 is a diagram showing an example of a conventional viewing angle control sheet.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/587,551 US7599117B2 (en) | 2004-09-15 | 2005-09-14 | View angle control sheet and display device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004268826 | 2004-09-15 | ||
JP2004-268826 | 2004-09-15 | ||
JP2005-135736 | 2005-05-09 | ||
JP2005135736 | 2005-05-09 |
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WO2006030823A1 true WO2006030823A1 (ja) | 2006-03-23 |
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ID=36060074
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PCT/JP2005/016928 WO2006030823A1 (ja) | 2004-09-15 | 2005-09-14 | 視野角制御シート及び表示装置 |
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Country | Link |
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US (1) | US7599117B2 (ja) |
JP (1) | JP5471821B2 (ja) |
CN (1) | CN102520467A (ja) |
WO (1) | WO2006030823A1 (ja) |
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KR101043693B1 (ko) * | 2006-10-31 | 2011-06-22 | 삼성코닝정밀소재 주식회사 | 디스플레이 장치용 필터 및 이를 포함한 디스플레이 장치 |
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CN105954918A (zh) * | 2016-07-11 | 2016-09-21 | 京东方科技集团股份有限公司 | 一种显示装置及其显示方法 |
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Also Published As
Publication number | Publication date |
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US7599117B2 (en) | 2009-10-06 |
CN102520467A (zh) | 2012-06-27 |
US20070153377A1 (en) | 2007-07-05 |
JP2010198037A (ja) | 2010-09-09 |
JP5471821B2 (ja) | 2014-04-16 |
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