WO2008066066A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2008066066A1
WO2008066066A1 PCT/JP2007/072929 JP2007072929W WO2008066066A1 WO 2008066066 A1 WO2008066066 A1 WO 2008066066A1 JP 2007072929 W JP2007072929 W JP 2007072929W WO 2008066066 A1 WO2008066066 A1 WO 2008066066A1
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WO
WIPO (PCT)
Prior art keywords
light
prism
display panel
display device
scattering layer
Prior art date
Application number
PCT/JP2007/072929
Other languages
English (en)
Japanese (ja)
Inventor
Yasunari Nagata
Original Assignee
Kyocera Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corporation filed Critical Kyocera Corporation
Priority to JP2008547005A priority Critical patent/JPWO2008066066A1/ja
Publication of WO2008066066A1 publication Critical patent/WO2008066066A1/fr

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Classifications

    • 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
    • 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
    • G02B6/0055—Reflecting element, sheet or layer

Definitions

  • the present invention relates to a display device including a prism sheet.
  • a liquid crystal display device As a display device for displaying an image, a liquid crystal display device, a cathode ray tube display device, a plasma display device, and the like can be cited. Among them, a liquid crystal display device is widely adopted from the viewpoint of size and power consumption.
  • a liquid crystal display device usually includes a liquid crystal display panel and a backlight for allowing light to enter the liquid crystal display panel.
  • the backlight is configured to emit scattered light that is uniformly incident on the liquid crystal display panel. However, since the light that is emitted from the backlight is scattered, the light emitted from the backlight cannot be sufficiently incident on the liquid crystal display panel. High brightness cannot be secured.
  • a liquid crystal display device has been developed in which a prism for condensing the light emitted from the backlight is arranged between the liquid crystal display panel and the backlight to solve such problems.
  • a prism for condensing the light emitted from the backlight is arranged between the liquid crystal display panel and the backlight to solve such problems.
  • a plurality of pixels arranged at equal pitches on the liquid crystal display panel and prisms having a constant prism pitch interfere optically.
  • optical unevenness appears strongly in the displayed image. Therefore, a technique for suppressing the degree of moire fringes caused by such optical interference has been developed, and is disclosed in, for example, Patent Document 1.
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-180834
  • the light passes through a plurality of light scattering layers formed by roughening the surface of the polarizing member.
  • the light is scattered every time it passes through the scattering layer, and the light collecting effect of the prism cannot be sufficiently improved to improve the brightness.
  • the present invention has been conceived under such circumstances, and the degree of moire fringes can be sufficiently suppressed, and the light condensing effect of the prism can be sufficiently connected to improve the luminance.
  • An object is to provide a display device that can be used.
  • a display device includes a display panel, a prism, and a single light scattering layer.
  • the display panel has a plurality of pixels arranged at substantially equal pitches in plan view.
  • the prism is disposed on one main surface side of the display panel.
  • the prism includes a plurality of first inclined surfaces that are inclined with respect to the one main surface of the display panel and a plurality of second inclined surfaces that are inclined at an angle different from the first inclined surface.
  • the light scattering layer described above is disposed between the display panel and the prism or on the other main surface side of the display panel, and has a function of scattering light.
  • the one main surface and the other main surface of the light scattering layer are substantially flat surfaces, respectively, and the one main surface and the other surface of the light scattering layer The main surface is substantially parallel.
  • L is the sum of the planar view lengths of the first inclined surface regions in the arrangement direction of the prisms corresponding to each pixel of the display panel, and the second inclined surface region in the arrangement direction of the prisms corresponding to each pixel of the display panel.
  • R is the sum of the planar lengths of the pixels
  • d (LR) ⁇ A
  • the difference between the maximum value and the minimum value of d calculated every time D is 0 or more and 0.3 or less and the haze value H is 5 or more, and the difference D is greater than 0.3 and 0.7 or less, the haze value H is The difference D is greater than 0.7 and 1 or less, and the haze value H is 20 or more.
  • the haze value H means the ratio of scattered transmitted light to incident light.
  • the substantially equal pitch means that each pitch is within a range of 98% to 102% with respect to the average value of all of them.
  • substantially flat means that the surface roughness force of the target surface is 0.1 ⁇ m or less in terms of the arithmetic average height Ra of standard B0601: 2001.
  • Substantially parallel means that the inclination of the symmetry plane (for example, the other main surface of the scattering layer) with respect to the reference surface (for example, one main surface of the scattering layer) is 2 ° or less.
  • a display device includes a display panel and a prism.
  • the display panel has a plurality of pixels arranged at substantially equal pitches in a plan view.
  • the display panel includes one light scattering layer having a function of scattering light.
  • the one main surface and the other main surface of the light scattering layer are substantially flat surfaces, respectively, and the one main surface and the other main surface of the light scattering layer are Are approximately parallel.
  • the prism is disposed on one main surface side of the display panel. Further, the prism includes a plurality of first inclined surfaces that are inclined with respect to the one main surface of the display panel, and a plurality of second inclined surfaces that are inclined at an angle different from the first inclined surface.
  • the aperture width of the pixel in the arrangement direction of the plurality of pixels of the display panel is A
  • the haze value of the light scattering layer is H
  • the haze value H is 5 or more, and when the difference D is greater than 0.3 and 0.7 or less, the haze value H is 10 or more. If D is greater than 0.7 and less than or equal to 1 and haze value H is greater than 20!
  • the display device includes a display panel, a prism, and one light scattering layer.
  • the display panel has a plurality of pixels arranged at substantially equal pitches in plan view.
  • the prism is disposed on one main surface side of the display panel. Further, the prism has a plurality of first inclined surfaces inclined with respect to one main surface of the display panel and a plurality of second inclined surfaces inclined at different angles from the first inclined surface. .
  • the one light scattering layer is disposed between the display panel and the prism or on the other main surface side of the display panel and has a function of scattering light.
  • one main surface of the light scattering layer in the region corresponding to the pixel, one main surface of the light scattering layer is a substantially flat surface, and the other main surface of the light scattering layer is an uneven surface.
  • the aperture width of the pixel in the arrangement direction of the plurality of pixels of the display panel is A, and the light scattering layer
  • the haze value is H
  • the total sum of the lengths in plan view of the first inclined surface area in the arrangement direction of the prisms corresponding to the respective pixels of the display panel is L
  • a D is 0 or more 0
  • Haze value H is 2 or more at 4 or less
  • difference D is greater than 0.4
  • haze value H is 4 or more at difference 0.7 or less
  • haze value H is at difference D is greater than 0.7 or less than 0.9
  • the difference D is greater than 0.9 and 1 or less
  • the haze value H is 12 or more.
  • the degree of moire fringes caused by optical interference between the display panel and the prism can be sufficiently reduced, so that, for example, it does not pass through a plurality of light scattering layers.
  • moire fringes can be sufficiently suppressed by one light scattering layer.
  • moire fringes caused by light interference are sufficiently weakened, so that it is not necessary to excessively increase the haze value in one light scattering layer in order to sufficiently suppress moire fringes. . Therefore, this display device is suitable for sufficiently suppressing the degree of moire fringes and sufficiently connecting the light collection effect of the prism to the luminance improvement.
  • the liquid crystal display device XI includes a liquid crystal display panel 10, a prism 20, a light scattering layer 30, polarizing members 40 and 41, a knock light 50, and a casing. 60.
  • a configuration for example, a bonding layer required for bonding the respective components is not described, but is provided as necessary.
  • the liquid crystal display panel 10 includes a liquid crystal layer 11, a first base 12, a second base 13, and a sealing member 14.
  • the liquid crystal layer 11 is interposed between the first base 12 and the second base 13, and the liquid crystal layer 11 is sealed with the sealing member 14 to form the display region G. Yes.
  • the liquid crystal layer 11 is a layer that includes liquid crystals that exhibit electrical, optical, mechanical, or magnetic anisotropy and have both solid regularity and liquid fluidity.
  • Examples of the liquid crystal include nematic liquid crystal, cholesteric liquid crystal, and smectic liquid crystal.
  • the liquid crystal layer 11 may be provided with a spacer (not shown) composed of a number of particulate members, for example, to keep the thickness of the liquid crystal layer 11 constant! /.
  • the first base 12 includes a transparent substrate 121, a light shielding layer 122, a color filter 123, a planarization layer 124, and a transparent electrode (not shown), and forms a display region G. It constitutes multiple pixels.
  • the first base 12 faces in a macro-random direction (regularity is
  • the liquid crystal layer 11 may be provided with an alignment film for aligning the liquid crystal molecules of the liquid crystal layer 11 in a predetermined direction.
  • the transparent substrate 121 is a member that supports a light shielding layer 122 and a color filter 123, which will be described later, and contributes to sealing the liquid crystal layer 11.
  • the transparent substrate 121 is configured to be able to appropriately transmit light in a direction intersecting the main surface (for example, in the direction of arrow AB).
  • Examples of the constituent material of the transparent substrate 121 include glass and translucent plastic.
  • the light blocking layer 122 is a member for blocking light (the light transmission amount is set to a predetermined value or less), and is formed on the inner surface 121 a of the transparent substrate 121.
  • the light shielding layer 122 has a plurality of through holes 122a penetrating in the film thickness direction (arrow AB direction). In the present embodiment, the through holes 122a are arranged at a substantially equal pitch at intervals of G in the first arrangement direction (arrow CD direction).
  • It has a mouth width and is arranged at a substantially equal pitch in the second arrangement direction (arrow EF direction).
  • the constituent material of the light shielding layer 122 contains a light shielding member
  • Resin materials metal materials such as chromium, metal oxide materials such as chromium oxide, and alloy materials such as Nikkenole tungsten alloy.
  • examples of the light shielding member include dyes having a high light shielding property (for example, black), pigments having a high light shielding property (for example, black), and carbon. Note that the size of the pixel in this embodiment is the penetration of the light shielding layer 122? It is prescribed from Ll22ai! /
  • the color filter 123 is a member that selectively absorbs light incident on the color filter 123 other than a predetermined wavelength and selectively transmits light having a predetermined wavelength.
  • the color finer 123 is formed on the lower surface 121 a of the transparent substrate 121 exposed from the through hole 122 a of the light shielding layer 122.
  • Examples of the constituent material of the color filter 123 include a resin material added with a dye or pigment.
  • the color filter 123 includes a red color filter (R) that selectively transmits the wavelength of red visible light, a green color filter (G) that selectively transmits the wavelength of green visible light, or the wavelength of blue visible light. For example, a blue color filter (B) that selectively transmits light.
  • the planarization layer 124 is a member that planarizes unevenness caused by disposing the light shielding layer 122, the color filter 123, and the like. As a constituent material of the planarizing layer 124, it has translucency. And a translucent material.
  • the translucent material include an ultraviolet curable resin such as a photosensitive resist material or a thermosetting resin.
  • the transparent electrode (not shown) of the first base 12 has a function of applying a predetermined voltage to the liquid crystal layer 11 positioned between the transparent electrode (not shown) of the second base 13 described later.
  • the constituent material of the transparent electrode in the first substrate 12 include a light-transmitting conductive member such as ITO dndiurn Tin Oxide) or tin oxide.
  • the translucency means a property of transmitting light.
  • the second base 13 includes a transparent substrate 131 and a transparent electrode (not shown), and constitutes a plurality of pixels that form the display region G.
  • the second substrate 13 includes an alignment film or the like for orienting the liquid crystal molecules of the liquid crystal layer 11 in a macroscopic random direction (small regularity) in a predetermined direction. ! /
  • the transparent substrate 131 is a member that supports a transparent electrode (not shown) and contributes to seal the liquid crystal layer 11.
  • the transparent substrate 131 is configured to be able to appropriately transmit light in the film thickness direction (for example, the arrow AB direction) intersecting the main surface.
  • the constituent material of the transparent substrate 131 may be the same as the constituent material of the transparent substrate 121.
  • the transparent electrode (not shown) of the second base 13 is a member that has a function of applying a predetermined voltage to the liquid crystal layer 11 positioned between the transparent electrode (not shown) of the first base 12. Yes, it is configured to transmit light incident from one side (for example, arrow B direction side) to the other side (for example, arrow A direction side).
  • Examples of the constituent material of the transparent electrode in the second base 13 include the same constituent materials as those of the transparent electrode in the first base 12.
  • the sealing member 14 is a member having a function of sealing the liquid crystal layer 11 between the first base 12 and the second base 13.
  • Examples of the constituent material of the sealing member 14 include an epoxy resin and an acrylic resin.
  • the white arrow shown in FIG. 4 represents the light path.
  • the constituent members of the liquid crystal display panel 10 excluding the first substrate 12, the light scattering layer 30, and the polarizing member 40 are omitted from the viewpoint of easy viewing.
  • the prism 20 moves from the arrow B direction side to the arrow A direction side in the film thickness direction of the prism 20.
  • the first inclined surface 20a that is inclined with respect to the one main surface of the liquid crystal display panel 10 is inclined on the one main surface side at an angle different from that of the first inclined surface 20a.
  • the first inclined surface 20a and the second inclined surface 20b are provided alternately at predetermined intervals in the first arrangement direction (arrow CD direction), and P is the average value of the intervals (prism pitch).
  • the length in the first arrangement direction (when viewed from the arrow A direction side toward the arrow B direction side) (plan view length) is L in the region of the first inclined surface 20a, and the second inclined surface
  • the region of 20b is R
  • planar view length L of the first inclined surface 20a of the prism 20 is the second inclined surface
  • the second inclined surface 20b is substantially perpendicular to the first inclined surface 20a substantially equal to the planar view length R of the surface 20b.
  • substantially perpendicular means that the inclination of the second inclined surface 20b with respect to the first inclined surface 20a is not less than 88 ° and not more than 90 °.
  • the first inclined surface 20a is formed to refract light incident perpendicularly to the other main surface 20c of the prism 20 in the right direction (arrow C direction), and the second inclined surface 20b is The light incident perpendicularly to the other main surface 20c of the prism 20 is refracted in the left direction (arrow D direction). For this reason, the light passing through the through-hole 122a varies in light bias with respect to the first arrangement direction depending on the amount of light passing through the first inclined surface 20a and the second inclined surface 20b of the prism 20. For example, in the pixel shown in FIG.
  • the light passing through the pixel includes a lot of light refracted in the right direction. That is, the light passing through the through hole 122a is biased to the right as a whole.
  • the sum of the plan view lengths of the first inclined surface 20a facing each through-hole 122a is L
  • the sum of the plan view lengths of the second tilted surface 20b is When R is R, the deviation d of the light passing through the pixel is derived from Equation 1 below.
  • the constituent material of the prism 20 includes a resin material having translucency.
  • the resin material having translucency include polycarbonate resin, polyester resin, and acrylic resin.
  • the light scattering layer 30 includes a light-transmitting material 31 and a light scattering material 32, and has a function of scattering light passing through the light scattering layer 30.
  • the light scattering layer 30 has a substantially flat one main surface 30a and the other main surface 30b, and the one main surface 30a and the other main surface 30b are formed substantially in parallel.
  • substantially flat means that the surface roughness force of the target surface is an arithmetic average height Ra of SJIS standard B0601: 2001 of 0.1 m or less.
  • Substantially parallel means that the inclination of the symmetry plane (for example, the other main surface of the light scattering layer 30) with respect to the reference surface (for example, the one main surface of the light scattering layer 30) is 2 ° or less.
  • the light scattering layer 30 is located between the liquid crystal display panel 10 and the prism 20.
  • the light transmissive material 31 is a member having a function of transmitting light in the light scattering layer 30.
  • the translucent material 31 include a translucent resin material and the like, and those having adhesive properties are particularly preferable so that a separate adhesive is not required.
  • the resin material include an ultraviolet spring curable resin and a thermosetting resin.
  • the light scattering material 32 is a member that has a function of scattering light in the light scattering layer 30.
  • the light scattering material 32 has at least a part of its surface covered with a light transmissive material 31 and is dispersed in a predetermined state (for example, a substantially uniform state) throughout the light scattering layer 30.
  • the constituent material of the light scattering material 32 include a light transmitting scattering material or a light reflecting material having a refractive index different from that of the light transmitting material 31, and in this embodiment, the light transmitting scattering material is used. It has been adopted.
  • the shape of the light scattering material 32 is not particularly limited, but is preferably particulate from the viewpoint of enhancing light scattering properties.
  • Examples of the translucent scattering material include translucent metal oxides, translucent silicon oxides, translucent resins, and the like.
  • examples of the translucent metal oxide include aluminum oxide, titanium oxide, zirconium oxide, tin oxide, indium oxide, cadmium oxide, and antimony oxide.
  • Examples of the translucent silicon oxide include silicon dioxide.
  • Examples of the translucent resin include polyolefin resin and formaldehyde resin.
  • Examples of the light reflecting material include metals or alloys thereof.
  • examples of the metal include iron, aluminum, and silver.
  • Examples of the alloy include aluminum chromium (AlCr), aluminum-neodymium (AlNd), silver-palladium (AgPd), and silver-palladium monocopper (AgP dCu).
  • the polarizing members 40 and 41 are for selectively allowing light oscillating in a predetermined direction to pass therethrough, and each have a substantially flat one main surface and the other main surface.
  • the constituent material of the polarizing members 40 and 41 include iodine-based materials.
  • the polarizing member 41 is configured such that the vibration direction (second vibration direction) of light passing through the polarizing member 41 is orthogonal to the vibration direction (first vibration direction) of light passing through the polarizing member 40. It is configured. Such a configuration is suitable for exhibiting a shirter function of light transmitted through the polarizing members 40 and 41.
  • the nocrite 50 includes a light source 51, a light guide plate 52, and a light reflecting member 53. From one side (arrow B direction side) of the liquid crystal display panel 10 to the other (arrow A direction side) It is a member responsible for the function of irradiating light. As shown in FIG. 1, the backlight 50 in the present embodiment employs an edge light system in which a light source 51 is arranged on the side surface of the light guide plate 52, but the light source 51 is provided on the back side of the liquid crystal display panel 10. Other methods, such as the directly placed method, may be adopted.
  • the light source 51 is configured to emit light toward the light guide plate 52.
  • Examples of the light source 51 include a cold cathode fluorescent lamp (CFU, LED (Light Emitting Diode), halogen lamp, xenon lamp, or EL (Electro-Luminescence).
  • CFU cold cathode fluorescent lamp
  • LED Light Emitting Diode
  • halogen lamp halogen lamp
  • xenon lamp xenon lamp
  • EL Electro-Luminescence
  • the light guide plate 52 transmits light from the light source 51 to the bottom surface of the liquid crystal display panel 10 (surface on the arrow B direction side). It is a member responsible for the function of guiding light substantially uniformly throughout.
  • the light guide plate 52 may be provided with a light diffusing member on the upper surface (surface on the arrow A direction side) of the more uniform planar light emission.
  • Examples of the constituent material of the light guide plate 52 include a transparent resin such as an acrylic resin or a polycarbonate resin.
  • the light reflecting member 53 is a member having a function of reflecting light directed from the light guide plate 52 toward the arrow B direction toward the arrow A direction.
  • the lower surface of the light guide plate 52 (arrow B direction) On the opposite side).
  • the constituent material of the light reflecting member 53 include a metal material or a foamed resin material.
  • the metal material include aluminum and silver.
  • the foamed resin material include those obtained by foaming polyethylene terephthalate resin.
  • the housing 60 is a member that houses the liquid crystal display panel 10, the prism 20, the light scattering layer 30, the polarizing member 40, and the knock light 50.
  • the upper housing 61 and the lower housing 62 are housed in the housing 60. Is included.
  • Examples of the constituent material of the housing 60 include a resin material and a metal material. Examples of the resin material include polycarbonate resin. Examples of metal materials include stainless steel and aluminum.
  • Fig. 7 the point where the surface defining the through-hole 122a of the light shielding layer 122 in the first arrangement direction and the end of the first inclined surface 20a of the prism 20 meet is the origin of the horizontal axis.
  • d is the maximum value.
  • the moire fringes appear stronger as the amplitude of d increases, and the moire fringes appear weaker as the amplitude of d decreases.
  • the shorter the period d the shorter the period in which moire fringes appear, and the longer the period d, the longer the periods in which moire fringes appear.
  • Table 1 shows the results of visual evaluation of the intensity of moire fringes that appear due to optical interference between the prism 20 and the liquid crystal display panel 10 shown in Figs. 7 (a), (b), and (c).
  • Table 2 shows a difference between the haze value H of the light scattering layer 30 and the difference D between the maximum value and the minimum value of the deviation d of the light passing through the pixel, using the liquid crystal display device XI according to this embodiment.
  • the results of visual evaluation of moiré fringes appearing in the relationship are shown.
  • “ ⁇ ” indicates that the degree of moire fringes can be sufficiently suppressed and no occurrence of image blurring that impedes practical use is observed, and the degree of moire fringes is sufficiently suppressed.
  • Evaluate as “ ⁇ ” if there is a possibility of image blurring that may be practically hindered, but evaluate as “X” if the degree of moire fringes cannot be sufficiently suppressed.
  • Haze value H is 5 or more at 3 or less, difference D is greater than 0.3 and 0.7 or less and haze value H is 10 or more, and difference D is greater than 0.7 and 1 or less and haze value H is 20 or more. It has been clarified that the degree of moire fringes can be sufficiently suppressed by selecting as follows.
  • the degree of moire fringes caused by optical interference between the liquid crystal display panel 10 and the prism 20 can be sufficiently weakened.
  • a plurality of light scattering layers Even if the light is not allowed to pass through, the light scattering layer 30 can sufficiently suppress the moire fringes.
  • moire fringes caused by light interference are sufficiently weakened, so that the haze value H in one light scattering layer 30 does not need to be excessively increased. Therefore, in the liquid crystal display device XI, the degree of moire fringes can be sufficiently suppressed, and the light condensing effect by the prism 20 can be sufficiently connected to the luminance improvement.
  • the haze value of the light scattering layer 30 can be sufficiently suppressed, so that the image blur of the liquid crystal display device XI can also be sufficiently suppressed.
  • a light scattering layer 30 including a light transmissive material 31 and a light scattering material 32 in which at least a part of the surface is covered with the light transmissive material 31 is employed. Therefore, in the liquid crystal display device 1, the haze value H of the light scattering layer 30 can be changed by changing the content ratio of the light scattering material 32 included in the translucent material 31. Therefore, the liquid crystal display device XI is suitable for adjusting the haze value of the light scattering layer 30 while keeping the one main surface and the other main surface of the light scattering layer 30 substantially flat.
  • the light scattering material 32 is made of a light transmitting material having a refractive index different from that of the light transmitting material 31 that covers the light scattering material 32. Therefore, in the liquid crystal display device 1, since reflection on the surface can be suppressed as compared with, for example, a metal light scattering material, incident light is prevented from being reflected backward (incident side). Power S can be. That is, in the liquid crystal display device XI, the luminance can be further increased by reducing the loss of light caused by backscattering.
  • the planar view length L 1S of each first inclined surface 20a of the prism 20 is each second
  • the liquid crystal display device XI is suitable for further suppressing a decrease in light luminance caused by passing through the light scattering layer 30.
  • the second inclined surface 20b is substantially perpendicular to the first inclined surface 20a of the prism 20. According to such a configuration, the mechanical strength of the first principal surface of the prism 20 is reduced due to a sharp angle of the second inclined surface 20b with respect to the first inclined surface 20a, and the first inclined surface 20a (2) It is possible to balance the decrease in the light condensing property of the prism 20 caused by the gentle angle of the inclined surface 20b. Therefore, the liquid crystal display device XI is suitable for achieving both the light condensing property of the prism and the mechanical strength with respect to one main surface of the prism 20.
  • the liquid crystal display device X2 differs from the liquid crystal display device XI in that it further includes a reflective polarizing member 70 disposed between the prism 20 and the light scattering layer 30.
  • the translucent material 31 in the present embodiment is made of a translucent material having adhesiveness, and the polarizing member 40 and the reflective polarizing member 70 are bonded to each other.
  • Other configurations of the liquid crystal display device X2 are the same as those described above for the liquid crystal display device XI.
  • the casing 60 is omitted from the viewpoint of easy viewing.
  • the reflective polarizing member 70 is a member that has a function of selectively passing light in the first vibration direction and reflecting light in the second vibration direction that is different from the vibration direction of the first vibration direction.
  • Examples of the reflective polarizing member 70 include a laminate obtained by laminating a resin material having translucency mixed with cholesteric liquid crystal, or a laminate obtained by laminating a plurality of translucent materials having different refractive indexes. Is mentioned.
  • examples of the light-transmitting resin material include polycarbonate resin, polyester resin, and acrylic resin.
  • the translucent material the same translucent scattering material described as the constituent material of the light scattering material 32 can be cited.
  • Table 3 shows the relationship between the haze value H of the light scattering layer 30 and the difference D between the maximum value and the minimum value of the deviation d of the light passing through the pixel using the liquid crystal display device X2 according to this embodiment. The results of visual evaluation of visible stripes are shown. The evaluation in Table 3 is based on the same evaluation criteria as in Table 2.
  • the liquid crystal display device X2 includes a reflective polarizing member 70 and a light reflecting member 53. Therefore, in the liquid crystal display device X2, the light that is oscillated in the second vibration direction among the light incident on the reflective polarizing member 70 from the prism 20 is reflected to the light reflecting member 53 side, and the reflected light is reflected on the light reflecting member 53. Thus, the light can be incident on the reflective polarizing member 70 again by being reflected toward the reflective polarizing member 70 side. That is, in the liquid crystal display device X2, the light that vibrates in the second vibration direction becomes light that vibrates in the first vibration direction and passes through the reflective polarizing member 70 until it is reflected by the reflective polarizing member 70 and the light reflecting member 53. Can be made. Therefore, in the liquid crystal display device X2, the light incident on the reflective polarizing member 70 from the backlight 50 can be more efficiently incident on the liquid crystal display panel 10, so that the luminance can be further increased.
  • the liquid crystal display device X2 a translucent resin having adhesiveness is employed as the translucent material 31. That is, in the liquid crystal display device X2, the light scattering layer 30 itself interposed between the liquid crystal display panel 10 and the reflective polarizing member 70 also functions as an adhesive layer. Therefore In the liquid crystal display device X2, an increase in the thickness of the entire device can be suppressed because the adhesive layer is not provided separately from the light scattering layer 30.
  • the reflective polarizing member 70 is interposed between the light scattering layer 30 and the liquid crystal display panel.
  • the liquid crystal display device X2 Oppositely arranged on one main surface of 10. That is, in the liquid crystal display device X2, the light scattering layer 30 is not interposed between the reflection deflecting member 70 and the light reflecting member 53. Therefore, in the liquid crystal display device X2, since the light reflected by the reflective polarizing member 70 that does not pass through the light scattering layer 30 can be incident on the light reflecting member 53, the reflection polarizing member 70 and the light reflecting member 53 It is possible to suppress a decrease in luminance due to scattering of light that is multiply reflected between the two. Therefore, the liquid crystal display device X2 is suitable for improving the luminance by efficiently using the light incident on the reflective polarizing member 70.
  • the planarization layer 124 of the liquid crystal display panel 10 is replaced with a light scattering layer 124 'instead of the light scattering layer 30 of the liquid crystal display device X2.
  • the liquid crystal display device X2 is different from the liquid crystal display device X2.
  • Other configurations of the liquid crystal display device X3 are the same as those described above with respect to the liquid crystal display device X2.
  • the casing 60 is omitted from the viewpoint of easy viewing.
  • the light scattering layer 124 ′ is configured by dispersing a light scattering material (not shown) in the planarization layer 124.
  • a light scattering material not shown
  • the one principal surface and the other principal surface are substantially flat surfaces, and the one principal surface and the other principal surface are each It is almost parallel.
  • substantially flat means that the surface roughness force of the target surface is an arithmetic average height Ra of standard B0601: 2001 of 0.1 m or less.
  • Substantially parallel means that the inclination of the symmetry plane (for example, the other main surface of the light scattering layer 30) with respect to the reference plane (for example, the one main surface of the light scattering layer 30) is 2 ° or less.
  • the constituent material of the light scattering material in the light scattering layer 124 ′ include the same materials as the light scattering material 32 in the light scattering layer 30. In this embodiment, a translucent scattering material is used.
  • Table 4 shows a relationship between the haze value H of the light scattering layer 124 'and the difference D between the maximum value and the minimum value of the deviation d of the light passing through the pixel using the liquid crystal display device X3 according to this embodiment. The results of visual evaluation of the moire fringes expressed by. The evaluation in Table 4 is based on the same evaluation criteria as in Table 2. [Table 4]
  • Haze value H is 5 or more at 3 or less, difference D is greater than 0.3 and 0.7 or less and haze value H is 10 or more, and difference D is greater than 0.7 and 1 or less and haze value H is 20 or more. It was revealed that the moiré fringes can be sufficiently suppressed by selecting so as to be.
  • the degree of moire fringes caused by optical interference between the liquid crystal display panel 10 and the prism 20 can be sufficiently weakened.
  • a plurality of light scattering layers Even if the light is not allowed to pass through, it is possible to sufficiently suppress moire fringes by the single light scattering layer 124 ′.
  • moire fringes caused by light interference are sufficiently weakened, so that the direct haze H in the one light scattering layer 124 ′ does not need to be excessively increased.
  • the degree of moire fringes can be sufficiently suppressed, and the light condensing effect by the prism 20 can be sufficiently linked to the luminance improvement.
  • the haze value of the light scattering layer 124 ′ can be sufficiently suppressed, so that the image blur of the liquid crystal display device X3 can be sufficiently suppressed.
  • the haze value is preferably 60 or less from the viewpoint of suppressing image blur.
  • the liquid crystal display device X3 employs a light-scattering layer 124 'including a light-transmitting material and a light-scattering material in which at least part of the surface is coated with the light-transmitting material. Therefore, in the liquid crystal display device X3, the haze value H of the light scattering layer 30 can be changed by changing the content ratio of the light scattering material 32 included in the translucent material 31. Therefore, the liquid crystal display device X3 is suitable for adjusting the haze value of the light scattering layer 30 while keeping the one main surface and the other main surface of the light scattering layer 30 substantially flat.
  • the light scattering layer 124 ′ also functions as the planarizing layer 124 for planarizing the unevenness. Therefore, in the liquid crystal display device X3, an increase in the thickness of the liquid crystal display device X3 can be suppressed by eliminating the need to provide a planarizing layer separately from the light scattering layer 124 ′.
  • a deflection member 40 having a light scattering layer 30 ′ obtained by roughening the surface instead of the light scattering layer 30 and the deflection member 40 differs from the liquid crystal display device X2 in that “ Other configurations of the liquid crystal display device X4 are the same as those described above regarding the liquid crystal display device X2. In FIG. 10, the case 60 is omitted from the viewpoint of easy viewing of the drawing.
  • the light scattering layer 30 ′ is configured by roughening the surface of the polarizing member 40 that faces the prism 20.
  • Table 5 shows the relationship between the direct haze H of the light scattering layer 30 'and the difference D between the maximum value and the minimum value D of the light passing through the pixel using the liquid crystal display device X4 according to this embodiment.
  • the results of visual evaluation of mole fringes expressed by The evaluation in Table 5 is based on the same evaluation criteria as in Table 2.
  • the degree of moire fringes caused by optical interference between the liquid crystal display panel 10 and the prism 20 can be sufficiently reduced, so that it is not necessary to pass through a plurality of light scattering layers.
  • moire fringes can be sufficiently suppressed by the single light scattering layer 30 ′.
  • moire fringes caused by optical interference are sufficiently weakened, so that the haze value H in one light scattering layer 30 ′ is not excessively increased to sufficiently suppress moire fringes. That's it. Therefore, the liquid crystal display device X4 can sufficiently suppress the degree of moire fringes and can sufficiently link the light collection effect of the prism 20 to the luminance improvement.
  • the image blur of the liquid crystal display device X4 can also be sufficiently suppressed.
  • the haze value is preferably 35 or less from the viewpoint of suppressing image blur.
  • the liquid crystal display device X5 according to the fifth embodiment of the present invention is different from the liquid crystal display device X4 in that another prism 21 is provided between the liquid crystal display panel 10 and the prism 20.
  • Other configurations of the liquid crystal display device X5 are the same as those described above for the liquid crystal display device X4.
  • the liquid crystal display device X4 will be described.
  • the liquid crystal display devices XI, X2, and X3 may be used.
  • the casing 60 is omitted from the viewpoint of easy viewing of the drawing.
  • the prism 21 is a member having a function of condensing light passing from the arrow B direction side to the arrow A direction side in the film thickness direction.
  • the prism 21 has, on one main surface side thereof, a third inclined surface 21a inclined with respect to the one main surface of the liquid crystal display panel 10, and a fourth inclined surface 2 lb inclined at a different angle from the third inclined surface 21a.
  • the third inclined surface 2 la and the fourth inclined surface 21b are provided alternately and periodically in the second arrangement direction, and the period (prism pitch) is equal to P. Further, the third inclined surface 21a and the fourth inclined surface 21b
  • the extending direction is substantially orthogonal to the extending direction of the first inclined surface 20a and the second inclined surface 20b.
  • substantially orthogonal means that the inclination of the prism groove extending direction of another prism is 88 ° or more and 90 ° or less with respect to the prism groove extending direction of the prism.
  • the third inclined surface 21a is formed so as to refract the light incident perpendicularly to the other main surface 21c of the prism 21 in the right direction (arrow F direction), and the fourth inclined surface 2 lb is the other side of the prism 21. It is formed to refract the light incident perpendicular to the main surface 21c in the left direction (arrow E direction).
  • the constituent material of the prism 21 is the same as the constituent material of the prism 20. Table 6 shows the relationship between P and P when A is 79 m and A is 237 m.
  • P P2 P P2 shows the result of visual evaluation of moire fringes that appear in the relationship.
  • the evaluation in Table 6 is based on the same evaluation criteria as in Table 2.
  • the liquid crystal display device X5 further includes a prism 21. Therefore, the liquid crystal display device X5 can condense the light that has passed through the prism 20 and the other prism 21 while suppressing the deviation with respect to the substantially orthogonal direction. Therefore, the liquid crystal display device X5 is suitable for suppressing variation in luminance due to a difference in viewing angle with respect to the liquid crystal display panel 10.
  • the power described using the liquid crystal display devices XI, X2, X3, X4, and X5 including the liquid crystal display panel 10 as the display device can be obtained even if a display panel without a display panel is employed.
  • the first base 12 of the liquid crystal display panel 10 has the light shielding layer 122, but may not have the light shielding layer 122.
  • Table 7 shows the results of visual evaluation of the moire fringes generated by the above. The evaluation in Table 7 is based on the same evaluation criteria as in Table 2.
  • the prism 20 has the force that the first inclined surface 20a and the second inclined surface 20b are continuously formed.
  • the first inclined surface 20a and the second inclined surface 20b are provided.
  • Other configurations may be used.
  • the prism 20 may have a substantially trapezoidal cross-sectional shape in a plane defined by the first arrangement direction (arrow CD direction) and the thickness direction (arrow AB direction).
  • the planar view lengths of the first inclined surface 20a ′ and the second inclined surface 20b ′ in the first arrangement direction when the one main surface of the prism 20 ′ is viewed in plan are respectively. This is represented by L ', R'.
  • one main surface is a flat surface 20d "w w
  • the light scattering layer 30 of the liquid crystal display device XI is located between the liquid crystal display panel 10 and the prism 20, but the first substrate 1 of the liquid crystal display panel 10 is not limited to such a configuration. Place them so that they face 2! Even with such a configuration, the same effect can be obtained.
  • the force S that forms the light scattering layer 30 ′ by roughening the surface of the polarizing member 40 facing the prism 20 is not limited to this.
  • a surface of the polarizing member 40 facing the prism 20 may be covered with a light scattering layer including a material and a light scattering material whose surface is partially covered with the light transmissive material. According to such a configuration, by changing the size of the light scattering material contained in the translucent material, it is possible to change the direct haze H of the light scattering layer. It is suitable for adjusting the haze value H of the light scattering layer while suppressing the scattering.
  • the force S forming the light scattering layer 30 ′ by roughening the surface of the polarizing member 40 facing the prism 20 is not limited to this.
  • the light scattering layer may be formed by roughening the surface.
  • Table 8 shows the results of visual evaluation of moire fringes caused by the relationship between the haze value H of the polarizing member 41 and the difference D between the maximum value and the minimum value of the deviation d of the light passing through the pixel.
  • the evaluation in Table 8 is based on the same evaluation criteria as in Table 2.
  • the liquid crystal display devices X3 and X4 are configured to include the reflective polarizing member 70! /, And the force is not limited to such a configuration. Can be configured! /, Brief description of drawings
  • FIG. 1 is a cross-sectional view showing a schematic configuration of a liquid crystal display device XI according to a first embodiment of the present invention.
  • FIG. 2A is a perspective view showing a schematic configuration of the liquid crystal display panel 10 shown in FIG. 1
  • FIGS. 2B and 2C are cross-sectional views showing the main configuration of the liquid crystal display panel 10 shown in FIG. It is.
  • FIG. 3A is a perspective view showing a schematic configuration of the prism 20 shown in FIG. 1, and FIG. 3B is an enlarged cross-sectional view of the main part along the Illb-Ilb line of FIG. 3A.
  • FIG. 4 is a schematic diagram showing how light passing through the prism 20 shown in FIG. 3 is refracted.
  • FIG. 5 To explain the deviation d of the light refracted when passing through the prism 20 due to the positional relationship between the through-hole 122a of the light shielding layer 122 shown in FIG. 2 and the prism 20 shown in FIG.
  • FIG. 6 A sectional view showing a schematic configuration of the light scattering layer 30 shown in FIG.
  • FIG. 7A shows the gap G between the through holes 122a of the light shielding layer 122 shown in FIG.
  • FIG. 7B shows an interval G between the through holes 122a of the light shielding layer 122 shown in FIG.
  • FIG. 7C shows a gap G of 99 m between the through holes 122a of the light shielding layer 122 shown in FIG.
  • FIG. 5 is a graph showing a relationship between a position (horizontal axis) and a deviation d (vertical axis) of light passing through a pixel.
  • FIG. 8 is a cross-sectional view showing a schematic configuration of a liquid crystal display device X2 according to a second embodiment of the present invention.
  • FIG. 9A is a cross-sectional view showing a schematic configuration of the entire liquid crystal display device X3 according to the third embodiment of the present invention
  • FIG. 9B is a liquid crystal display device according to the third embodiment of the present invention.
  • FIG. 3 is an enlarged cross-sectional view of a main part showing a schematic configuration of X3.
  • FIG. 10 is a cross-sectional view showing a schematic configuration of a liquid crystal display device X4 according to a fourth embodiment of the present invention.
  • FIG. 11 is a cross-sectional view showing a schematic configuration of a liquid crystal display device X5 according to a fifth embodiment of the present invention.
  • FIG. 12A is a perspective view showing a schematic configuration of the prism 21 shown in FIG. 11, and FIG. 12B is an enlarged cross-sectional view of a main part along the Xllb-Xllb line of FIG. 12A.
  • FIG. 13A is a perspective view showing a schematic configuration of a modified example of the prism 20 in the liquid crystal display devices XI, X2, X3, X4, and X5, and FIG. 13B is along the Xlllb-Xlllb line in FIG. 13A. It is a principal part expanded sectional view.
  • FIG. 14A is a perspective view showing a schematic configuration of a modified example of the prism 20 in the liquid crystal display devices XI, X2, X3, X4, and X5, and FIG. 14B is taken along line XlVb-XlVb in FIG. 14A It is a principal part expanded sectional view.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

[PROBLÈME DEVANT ÊTRE RÉSOLU] C'est un objectif que de proposer un dispositif d'affichage composé d'un prisme qui peut réduire des franges de Moiré. [MOYENS POUR RÉSOUDRE LES PROBLÈMES] Un dispositif d'affichage à cristaux liquides (X1) comprend un pixel avec la largeur d'ouverture Ap définie dans la direction de la flèche CD, une couche de diffusion de lumière (30) avec une valeur de Hayes H, un prisme (20) correspondant à chaque pixel d'un panneau d'affichage à cristaux liquides (10) dans lequel une somme totale L de longueur de visualisation de plan d'une première région de surface inclinée du prisme (20) est définie dans la direction de la flèche CD et une somme totale R des longueurs de visualisation de plan d'une seconde région de surface inclinée du prisme (20) est définie dans la direction de la flèche CD, d = (L-R)/Ap étant calculé pour chaque pixel, le Hayes H n'étant pas inférieur à 5 dans le cas où une différence D entre le maximum et le minimum de d n'est pas inférieur à 0 mais n'est pas supérieure à 0,3, le Hayes H n'étant pas inférieur à 10 dans le cas où la différence D est supérieure à 0,3 mais n'est pas supérieure à 0,7, et le Hayes H n'étant pas inférieur à 20 dans le cas où la différence D est supérieure à 0,7 mais n'est pas supérieure à 1.
PCT/JP2007/072929 2006-11-29 2007-11-28 Dispositif d'affichage WO2008066066A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2799765A2 (fr) * 2013-04-30 2014-11-05 LG Display Co., Ltd. Dispositif d'affichage

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH1152377A (ja) * 1997-07-31 1999-02-26 Nitto Denko Corp 光路制御板、面光源装置、偏光光源装置及び液晶表示装置
JP2000180624A (ja) * 1998-10-05 2000-06-30 Dainippon Printing Co Ltd カラ―フィルタ
JP2003279986A (ja) * 2002-03-26 2003-10-02 Seiko Epson Corp 液晶表示装置および電子機器
JP2006235014A (ja) * 2005-02-23 2006-09-07 Hitachi Displays Ltd 液晶表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1152377A (ja) * 1997-07-31 1999-02-26 Nitto Denko Corp 光路制御板、面光源装置、偏光光源装置及び液晶表示装置
JP2000180624A (ja) * 1998-10-05 2000-06-30 Dainippon Printing Co Ltd カラ―フィルタ
JP2003279986A (ja) * 2002-03-26 2003-10-02 Seiko Epson Corp 液晶表示装置および電子機器
JP2006235014A (ja) * 2005-02-23 2006-09-07 Hitachi Displays Ltd 液晶表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2799765A2 (fr) * 2013-04-30 2014-11-05 LG Display Co., Ltd. Dispositif d'affichage
EP2799765A3 (fr) * 2013-04-30 2014-11-26 LG Display Co., Ltd. Dispositif d'affichage
US9304245B2 (en) 2013-04-30 2016-04-05 Lg Display Co., Ltd. Display device including a light guide bonded to a display panel

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