WO2013180152A1 - Procédé d'évaluation de dispositif d'affichage, et dispositif d'affichage - Google Patents

Procédé d'évaluation de dispositif d'affichage, et dispositif d'affichage Download PDF

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Publication number
WO2013180152A1
WO2013180152A1 PCT/JP2013/064843 JP2013064843W WO2013180152A1 WO 2013180152 A1 WO2013180152 A1 WO 2013180152A1 JP 2013064843 W JP2013064843 W JP 2013064843W WO 2013180152 A1 WO2013180152 A1 WO 2013180152A1
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Prior art keywords
display device
phosphor layer
light
polar angle
phosphor
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PCT/JP2013/064843
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English (en)
Japanese (ja)
Inventor
博敏 安永
壮史 石田
龍三 結城
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シャープ株式会社
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Publication of WO2013180152A1 publication Critical patent/WO2013180152A1/fr

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    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell

Definitions

  • the present invention relates to a display device evaluation method and a display device.
  • a back light source a first polarizing layer, a first transparent substrate, a first transparent electrode, a liquid crystal, a second transparent electrode, a second polarizing layer, a phosphor layer, and a second transparent
  • a liquid crystal display element capable of color display which has a structure in which conductive substrates are sequentially laminated, reduces light loss from a back light source, and improves luminance (for example, Japanese Patent Laid-Open No. 11-52371) See Patent Document 1)).
  • liquid crystal displays have become mainstream in the display field.
  • the luminance change depending on the viewing angle of the liquid crystal display depends on the angle characteristics of the liquid crystal, and the liquid crystal display has a drawback that the luminance changes depending on the viewing angle.
  • the transmittance of light incident on a liquid crystal panel is greatly different from that of light incident obliquely.
  • the transmittance decreases as the light incident angle increases during white display. Therefore, even if the brightness of the backlight is uniform in all polar directions, the brightness changes depending on the polar angle when light passes through the liquid crystal layer. There was a problem that the brightness decreased as the viewing was performed.
  • the present invention has been made in view of the above problems, and a main purpose thereof is to provide a display device evaluation method capable of evaluating whether the display device has a uniform luminance regardless of the observation angle.
  • a display device evaluation method is a display device evaluation method comprising: a light source that emits light; and a phosphor layer that includes a phosphor that absorbs light emitted from the light source and emits fluorescence.
  • the polar angle ⁇ and the luminous intensity l ⁇ of the emitted light from the phosphor layer at the polar angle ⁇ are in the range of ⁇ 85 ° ⁇ ⁇ ⁇ 85 °, and from the phosphor layer at the polar angle of 0 °. It is evaluated whether or not 0.93 ⁇ B ⁇ cos ⁇ ⁇ l ⁇ ⁇ 1.07 ⁇ B ⁇ cos ⁇ is satisfied for an arbitrary real number B in the range of 0.93 to 1.076 times the luminous intensity of the emitted light. .
  • the display device includes a light source that emits light, an optical shutter that selectively emits light incident from the light source, and a light that is incident from the optical shutter.
  • the display device evaluation method of the present invention by creating and clarifying the conditions for achieving uniform display luminance, the display device satisfying the conditions is evaluated to have uniform luminance regardless of the observation angle. can do.
  • FIG. 1 is a cross-sectional view illustrating a display device according to a first embodiment. It is a schematic diagram which shows the outline of a polar angle. It is a figure which shows the relationship between a polar angle and a luminous intensity in case brightness
  • FIG. 10 is a cross-sectional view illustrating a display device according to a fifth embodiment.
  • FIG. 10 is a cross-sectional view illustrating a first example of a partition wall according to a fifth embodiment.
  • FIG. 10 is a cross-sectional view illustrating a first example of a partition wall according to a fifth embodiment.
  • FIG. 10 is a cross-sectional view illustrating a second example of a partition wall according to the fifth embodiment.
  • FIG. 10 is a cross-sectional view showing a third example of the partition wall according to the fifth embodiment.
  • FIG. 10 is a cross-sectional view showing a fourth example of the partition wall in the fifth embodiment. It is a graph which shows the actual value of luminous intensity distribution of the emitted light from the fluorescent substance layer arrange
  • FIG. 10 is a cross-sectional view illustrating a display device according to a sixth embodiment. It is sectional drawing which expands and shows the fluorescent substance layer of Embodiment 6.
  • FIG. 10 is a cross-sectional view illustrating a display device according to a seventh embodiment.
  • FIG. 1 is a cross-sectional view showing a display device 200 according to the first embodiment.
  • a display device 200 illustrated in FIG. 1 includes a backlight 20 as a light source, an optical shutter 150, and a color conversion substrate 100.
  • the backlight 20 emits substantially parallel blue light toward the optical shutter 150.
  • the backlight 20 may be a light source that generates near-ultraviolet light.
  • the optical shutter 150 selectively emits blue light incident from the backlight 20 and selectively causes the blue light to enter the color conversion substrate 100.
  • the light shutter 150 adjusts the gradation of the light generated by the backlight 20.
  • a liquid crystal panel, a liquid crystal panel using an in-cell polarizing plate, a device using MEMS, or the like can be used.
  • MEMS liquid crystal panel or MEMS
  • an organic EL panel or an inorganic EL panel it is also conceivable to use an organic EL panel or an inorganic EL panel.
  • the color conversion substrate 100 includes a phosphor layer 3 and a transparent substrate 4.
  • the phosphor layer 3 includes a main surface 1 and a main surface 2.
  • the transparent substrate 4 is disposed on the main surface 1 of the phosphor layer 3.
  • Incident light in a predetermined frequency region is incident on the main surface 2 of the phosphor layer 3 from the backlight 20, and light is emitted from the main surface 1 of the phosphor layer 3.
  • the main surface 2 is an incident surface on which light enters the phosphor layer 3, and the main surface 1 is an exit surface from which light is emitted from the phosphor layer 3.
  • the phosphor layer 3 includes a phosphor such as an organic phosphor, an inorganic phosphor, or a nanophosphor.
  • the phosphor absorbs light incident through the optical shutter 150 and emits fluorescence of each color isotropically.
  • the phosphor layer 3 is formed by arranging and molding a mixture of a phosphor and a binder resin.
  • the phosphor layer 3 is arranged such that light incident on the phosphor layer 3 from the optical shutter 150 is irradiated to the phosphor.
  • the type of phosphor to be used is preferably selected in consideration of the concentration of the phosphor added, the thickness of the phosphor layer 3 to be formed, the absorption rate, and the like.
  • the phosphor layer 3 may include a scattering material that scatters light incident through the optical shutter 150 together with the phosphor or instead of the phosphor.
  • the transparent substrate 4 for example, a glass substrate, a transparent film, or a transparent resin can be employed.
  • the transparent substrate 4 is disposed on the phosphor layer 3 and has an emission surface 9 on the side opposite to the side facing the phosphor layer 3.
  • the emission surface 9 is provided as a surface from which light is emitted from the display device 200 to the outside. Light extracted from the display device 200 to the outside is emitted from the emission surface 9.
  • a color filter layer can be provided on the emission surface 9 side with respect to the phosphor layer 3.
  • the display device 200 can be applied as an image display device that displays an image from the exit surface 9 or an illumination device that emits illumination light of an arbitrary hue from the exit surface 9.
  • FIG. 2 is a schematic diagram showing an outline of the polar angle ⁇ .
  • the polar angle ⁇ refers to an angle with respect to the planar exit surface 9 of the display device 200 and refers to an angle formed with respect to the normal line of the exit surface 9.
  • the polar angle ⁇ formed by the straight line extending in one direction with respect to the normal is 90 °.
  • the polar angle ⁇ formed by the straight line extending in the other direction in the direction opposite to the one direction is ⁇ 90 °.
  • FIG. 3 is a diagram showing the relationship between the polar angle and the luminous intensity when the luminance of the display device 200 is uniform regardless of the observation angle.
  • the horizontal axis in FIG. 3 indicates the polar angle. In the direction directly in front of the emission surface 9 of the display device 200, the polar angle ⁇ is 0 °.
  • the vertical axis in FIG. 3 indicates the luminous intensity, that is, the size of the light beam emitted from the display device 200 in the polar angle ⁇ direction.
  • the luminous intensity of the emitted light from the display device 200 in the direction where the polar angle ⁇ is 0 ° is assumed to be l0.
  • FIG. 3 shows the luminous intensity of the emitted light from the point when the position of the origin in FIG. 3 is considered as a certain point on the emission surface 9 of the display device 200.
  • the display device 200 has a uniform luminance regardless of the observation angle. Evaluate that there is. That is, in the display device 200 that can be evaluated as having uniform brightness regardless of the observation angle, the polar angle distribution of the luminous intensity of the emitted light from the phosphor layer 3 is in a certain range.
  • the polar angle ⁇ and the luminous intensity l ⁇ of the emitted light from the phosphor layer 3 at the polar angle ⁇ are in the range of ⁇ 85 ° ⁇ ⁇ ⁇ 85 °, 0.90 ⁇ A ⁇ cos ⁇ ⁇ l ⁇ . It is evaluated whether or not the relational expression of ⁇ 1.10 ⁇ A ⁇ cos ⁇ is satisfied.
  • A is an arbitrary real number in the range of 0.91 to 1.11 times the luminous intensity 10 of the emitted light from the phosphor layer 3 at the polar angle 0 °, and the luminous intensity 10 at the polar angle 0 °. Is within the range of ⁇ 10%.
  • the display device 200 When the display device 200 satisfies this relational expression, the display device 200 is realized in which the change in luminance is sufficiently small regardless of the angle at which the display device 200 is viewed, and the luminance is uniform at all viewing angles. Can be evaluated.
  • This conditional expression clarifies conditions for achieving uniform luminance of the display device 200.
  • FIG. 4 is a graph showing measured values of the luminous intensity distribution of the emitted light from the phosphor layer 3.
  • FIG. 5 is a graph in which the measured value of the luminous intensity distribution shown in FIG. 4 is applied to the conditional expression. 4 and 5, the horizontal axis indicates the polar angle, and the vertical axis indicates the relative luminous intensity.
  • the outgoing light from the phosphor layer 3 the range outside the polar angle ⁇ 70% cannot be measured due to the measurement limit. Therefore, in FIG. 4, the outgoing light in the polar angle range of ⁇ 70 ° to 70 ° is used.
  • the light intensity distribution is shown.
  • the curve drawn with a solid line in FIG. 5 is the actual measurement value of the luminous intensity distribution of the emitted light from the phosphor layer 3, which is the same as in FIG. 4.
  • Two curves drawn with a broken line in FIG. 5 show 0.90 times and 1.10 times of the function f ( ⁇ ).
  • the polar angle ⁇ is in the range of not less than ⁇ 85 ° and not more than 85 °, and in the range of not less than 0.90 times and not more than 1.10 times A ⁇ cos ⁇ .
  • the luminous intensity l ⁇ of the emitted light from the phosphor layer 3 at the polar angle ⁇ satisfies the above-described conditional expression, so that the display device 200 can be evaluated as having uniform luminance regardless of the viewing angle. Therefore, the display device 200 with uniform brightness regardless of the observation angle can be realized, and the display device 200 with uniform brightness can be intentionally manufactured.
  • the display device 200 includes the phosphor layer 3 including a plurality of pixels that can emit red light, green light, and blue light, respectively, and the display device 200 is white light by superimposing these colors. Can be displayed.
  • the error of the chromaticity xy needs to be within ⁇ 0.02 in order to suppress the color change depending on the observation angle to such an extent that it cannot be felt by human eyes.
  • a condition for evaluating that the change in chromaticity of the display device 200 is within ⁇ 0.02 and that the display device 200 has uniform chromaticity regardless of the observation angle will be described.
  • FIG. 6 shows that in the display device 200 configured by RGB pixels, when the output light from the B pixel has an error of 0% from the conditional expression, the white display chromaticity is ⁇ 0 when the RG deviates from the conditional expression. It is a graph which shows whether it changes more than 0.02.
  • the G coefficient on the horizontal axis of the graph of FIG. 6 indicates an error from the conditional expression of the luminous intensity of light emitted from the G pixel.
  • the R coefficient on the vertical axis indicates an error from the conditional expression of the luminous intensity of light emitted from the R pixel.
  • the G coefficient of 1.05 means that the error from the conditional expression of the luminous intensity of light emitted from the G pixel is + 5%.
  • the chromaticity change is ⁇ 0.02 on the line plotted in the graph shown in FIG. 6 (inner line when there is a double line). In the graph of FIG. 6, if it is within the area surrounded by the plot line, the chromaticity change is within ⁇ 0.02 from the state in accordance with the conditional expression for all RGB.
  • the chromaticity change of the display device 200 is 0.02. Fits within.
  • B is an arbitrary real number in the range of 0.93 times to 1.076 times the luminous intensity 10 of the emitted light from the phosphor layer 3 at the polar angle 0 °, and the luminous intensity 10 at the polar angle 0 °. Is within a range of ⁇ 7%.
  • the chromaticity xy falls within an error of ⁇ 0.02, and if the chromaticity xy is within ⁇ 0.02, it is unlikely that a human will feel a color change. Therefore, it can be evaluated that the display device 200 having uniform brightness and chromaticity at all viewing angles has been realized.
  • This conditional expression clarifies the conditions for achieving chromaticity uniformity of the display device 200, and it can be evaluated that a display apparatus that satisfies the conditional expression has a characteristic that the chromaticity does not change depending on the observation angle.
  • FIG. 7 is a graph showing the polar angle distribution of light emitted from the R phosphor.
  • FIG. 8 is a graph showing the luminous intensity polar angle distribution of the emitted light from the G phosphor.
  • FIG. 9 is a graph showing the luminous intensity polar angle distribution of the emitted light from the scattering material in the B pixel. 7, 8, and 9, the horizontal axis indicates the polar angle, and the vertical axis indicates the relative luminous intensity.
  • the real number B is set to 1.06 times the luminous intensity 10 of the emitted light from the R phosphor at a polar angle of 0 °. That is, B in the conditional expression is set to 1.06 ⁇ 10.
  • Two curves drawn with a broken line in FIG. 7 show 0.93 times and 1.07 times of the function f ( ⁇ ).
  • the real number B is 1.006 times the luminous intensity 10 of the emitted light from the R phosphor at a polar angle of 0 °. That is, B in the conditional expression is set to 1.006 ⁇ 10.
  • Two curves drawn with a broken line in FIG. 8 show 0.93 times and 1.07 times of the function f ( ⁇ ).
  • Two curves drawn with a broken line in FIG. 9 show 0.93 times and 1.07 times of the function f ( ⁇ ).
  • the luminous intensity l ⁇ of the emitted light from each of the RGB phosphors is When the polar angle ⁇ is in the range of ⁇ 85 ° to 85 °, it is in the range of 0.93 times to 1.07 times B ⁇ cos ⁇ . Therefore, since the luminous intensity l ⁇ of the light emitted from the phosphor layer 3 at the polar angle ⁇ satisfies the above-described conditional expression, it can be evaluated that the display device 200 is uniform in chromaticity regardless of the viewing angle. Therefore, the display device 200 with uniform chromaticity can be realized regardless of the observation angle, and the display device 200 whose luminance and chromaticity do not change with the observation angle can be intentionally manufactured.
  • FIG. 10 is a cross-sectional view showing the display device 200 according to the third embodiment.
  • the phosphor layer 3 includes a red phosphor layer 5r and a green phosphor layer 5g.
  • the phosphor layer 3 also includes a diffusion layer 6.
  • the red phosphor layer 5r, the green phosphor layer 5g, and the diffusion layer 6 are partitioned by the partition wall 7, and are arranged in an array with a space therebetween.
  • the red phosphor layer 5r includes a red phosphor that absorbs incident light incident on the red phosphor layer 5r and emits red light.
  • the green phosphor layer 5g includes a green phosphor that absorbs incident light incident on the green phosphor layer 5g and emits green light.
  • the diffusion layer 6 diffuses the incident light incident on the diffusion layer 6 and emits it to the outside.
  • the diffusion layer 6 includes a transparent resin as a binder and a plurality of scattering particles as fillers scattered in the resin.
  • the filler may be any material that reflects and scatters light supplied to the phosphor layer 3 via the optical shutter 150.
  • the display device 200 can It is provided as a video display device capable of displaying full color video.
  • the optical shutter 150 a liquid crystal display panel is used.
  • the optical shutter 150 is a glass substrate 22 that is a TFT (Thin Film ⁇ Transistor) substrate disposed on the backlight 20 side and a counter substrate disposed on the color conversion substrate 100 side.
  • the glass substrate 24 and the liquid crystal layer 23 enclosed between the glass substrate 22 and the glass substrate 24 are included.
  • An annular seal member (not shown) for sealing the liquid crystal layer 23 is provided between the glass substrates 22 and 24 along the outer peripheral edge portions of the glass substrates 22 and 24.
  • a polarizing plate 21 is attached to the outer surface of the glass substrate 22, and a polarizing plate 25 is attached to the outer surface of the glass substrate 24.
  • a source wiring is formed on the surface of the glass substrate 22 on the liquid crystal layer 23 side, and an insulating layer is formed so as to cover the source wiring. Further, pixel electrodes are arranged on the surface of the insulating layer so as to correspond to the respective pixels.
  • the pixel electrode is formed of a transparent conductive film such as an ITO (indium tin oxide) film.
  • a counter electrode is formed on the surface of the glass substrate 24 on the liquid crystal layer 23 side.
  • the counter electrode is formed of a transparent conductive film such as an ITO film, for example.
  • the optical shutter 150 controls the light transmittance in the pixel by a combination of the change in the polarization state by the liquid crystal layer 23 and the polarizing plates 21 and 25.
  • the emitted light from the red phosphor layer 5r and the green phosphor layer 5g can be uniform in luminance without depending on the polar angle. To do. Since the light emission of the phosphor is isotropic, if the refractive index of the phosphor is small, the luminous intensity polar angle distribution of the light emitted from the phosphor deviates from the conditional expressions described in the first and second embodiments.
  • the refractive index of the phosphor is equal to that of air
  • the light emitted from the phosphor is emitted into the air without being refracted, so the luminous intensity of the light emitted from the surface-shaped phosphor is constant regardless of the polar angle.
  • the luminous intensity polar angle distribution of the light emitted from the phosphor approaches 10 ⁇ cos ⁇ shown in FIG.
  • the refractive index of the phosphor is extremely large with respect to the air, the light in the front is almost refracted in the phosphor and is emitted to each polar angle in the air.
  • the larger the polar angle region in the air the more light within a narrower range is extended in the phosphor.
  • the polar angle range in the phosphor is 0.05 to 0.15 ° (difference 0.10) within the polar angle range of 0.5 to 1.5 ° in the air. °) light is stretched and emitted.
  • the polar angle range of 79.5 to 80.5 ° in the air light in the polar angle range of 5.64 to 5.66 ° (difference 0.02 °) in the phosphor is stretched and emitted. Is done. Since the phosphor emits isotropically in the phosphor and the luminous intensity per unit solid angle is the same in all directions, the larger the polar angle in the air, the smaller the luminous intensity. As a result, in the state where the refractive index is maximum, the luminous intensity polar angle distribution in the air approaches as much as 10 ⁇ cos ⁇ .
  • the refractive index threshold for the luminous intensity polar angle distribution in air to be within ⁇ 10% of l0 ⁇ cos ⁇ is 1.74
  • the refractive index threshold to be within ⁇ 7% is 2.02.
  • FIG. 11 is a graph showing a luminous intensity polar angle distribution of emitted light when a phosphor having a refractive index of 1.74 is caused to emit light.
  • the horizontal axis in FIG. 11 indicates the polar angle, and the vertical axis indicates the relative luminous intensity.
  • FIG. 12 is a graph showing the luminous intensity polar angle distribution of emitted light when a phosphor having a refractive index of 2.02 is caused to emit light.
  • the horizontal axis indicates the polar angle
  • the vertical axis indicates the relative luminous intensity.
  • the luminous intensity l ⁇ of the emitted light indicated by the solid line in FIG. 11 has a polar angle ⁇ of ⁇ 85 ° or more and 85 ° or less. In this range, A ⁇ cos ⁇ is in the range of 0.90 times or more and 1.10 times or less. Therefore, it can be evaluated that the display device 200 has uniform luminance regardless of the viewing angle.
  • the real number B the luminous intensity l ⁇ of the emitted light indicated by the solid line in FIG.
  • this display device 200 has a polar angle ⁇ of ⁇ 85 ° to 85 °. In the following range, it is in the range of 0.93 times to 1.07 times B ⁇ cos ⁇ . Therefore, this display device 200 can be evaluated as having uniform chromaticity regardless of the viewing angle. Therefore, it is possible to realize a display device 200 with uniform brightness regardless of the observation angle, and it is possible to realize a display device 200 with no change in chromaticity.
  • a scattering material capable of completely diffusing the blue light generated by the backlight 20 is provided. Since the scattering material completely diffuses the blue light generated in the backlight 20, the luminous intensity polar angle distribution of the light emitted from the scattering material satisfies the conditional expression shown in the first or second embodiment.
  • a light source that generates near-ultraviolet light as the backlight 20 and to use a blue phosphor for the blue pixel.
  • the luminance uniformity method of the blue pixel is the above-described red / green pixel. It will be the same.
  • the luminous intensity polar angle distribution of the emitted light from each phosphor and the scattering material satisfies the conditional expression, and the display device 200 that satisfies the conditional expression It can be evaluated that the luminance (and chromaticity) is uniform regardless of the observation angle.
  • the phosphor layer 3 includes a scattering material that scatters light.
  • the phosphor layer containing the scattering material has scattering characteristics.
  • the red phosphor layer 5r and the green phosphor layer 5g (including the blue phosphor when a blue phosphor is used for the blue pixel) have scattering characteristics, so that the fluorescence excited by the phosphor can be converted into the phosphor layer. 3 can diffuse.
  • the conditional expression shown in the first or second embodiment can be achieved, and the fluorescence emitted from the phosphor layer 3 can be uniform in luminance without depending on the polar angle. .
  • FIG. 13 is a graph showing the luminous intensity polar angle distribution of light emitted from a material in which a phosphor and a scattering material are mixed.
  • FIG. 13 shows measured values of the luminous intensity distribution of emitted light from a material in which a phosphor and a scattering material of TiO 2 particles are mixed at a ratio of 1: 1.
  • the horizontal axis in FIG. 13 indicates the polar angle, and the vertical axis indicates the relative luminous intensity.
  • Two curves drawn with a broken line in FIG. 13 show 0.90 times and 1.10 times of the function f ( ⁇ ).
  • the luminous intensity l ⁇ of the emitted light indicated by the solid line in FIG. Is in the range of 0.90 times to 1.10 times of A ⁇ cos ⁇ in the range of ⁇ 85 ° to 85 °. Therefore, since the luminous intensity l ⁇ of the light emitted from the phosphor layer 3 at the polar angle ⁇ satisfies the conditional expression shown in the first embodiment, it can be evaluated that the display device 200 has uniform luminance regardless of the viewing angle. . Therefore, the display device 200 with uniform brightness regardless of the observation angle can be realized, and the display device 200 with uniform brightness can be intentionally manufactured.
  • FIG. 14 is a cross-sectional view showing display device 200 according to the fifth embodiment.
  • the display device 200 according to the fifth embodiment has basically the same configuration as that of the display device according to the third embodiment shown in FIG. 10, and the partition walls 7 that partition the phosphor layers 3 and the diffusion layers of the respective colors are formed in a bank shape. It differs in the point provided in.
  • the phosphor layer 3 includes an incident surface on which light is incident on the phosphor layer 3, an exit surface from which light is emitted from the phosphor layer 3, and a side wall surface that is connected to the entrance surface and the exit surface and faces the partition wall portion 7.
  • the side wall surface of the phosphor layer 3 is inclined so that the phosphor layer 3 spreads from the light source side toward the display side.
  • the light source side indicates the side where the backlight 20 is disposed with respect to the phosphor layer 3, that is, the lower side in FIG.
  • the display side indicates the side opposite to the light source side where the emission surface 9 is disposed with respect to the phosphor layer 3, that is, the upper side in FIG.
  • FIG. 15 is a cross-sectional view showing a first example of the partition wall portion 7 of the fifth embodiment.
  • the partition wall 7 is made of a resin material.
  • the partition wall portion 7 has the maximum width at the end on the light source side, gradually decreases in width toward the exit surface 9 side, and has the minimum width at the end portion on the exit surface 9 side.
  • the partition wall portion 7 has a shape that tapers from the light source side toward the emission surface 9 side.
  • the cross-sectional shape of the partition wall portion 7 shown in FIG. 15 is a trapezoidal shape having a base with a large size on the light source side and a base with a small size on the exit surface side.
  • the facing surface 7a of the partition wall 7 facing the phosphor layer 3 forms a trapezoidal leg.
  • the fluorescence excited by the phosphor in the phosphor layer 3 emits isotropically. A part of the fluorescence is emitted in the direction of the facing surface 7 a of the partition wall 7. As indicated by the arrows in FIG. 15, among the fluorescence emitted isotropically in the phosphor layer 3, the fluorescence toward the side wall surface of the phosphor layer 3 is reflected by the facing surface 7 a of the partition wall portion 7, and the phosphor layer 3. Proceed toward the exit surface. The fluorescence emitted from the phosphor layer 3 proceeds to the emission surface 9 side via the transparent substrate 4 and is emitted from the display device 200 via the emission surface 9.
  • FIG. 16 is a cross-sectional view showing a second example of the partition wall portion 7 of the fifth embodiment.
  • the reflection film 8 is further coated on the surface of the partition wall portion 7.
  • the reflective film 8 may be formed of a metal material having a high reflectance represented by aluminum, for example.
  • the reflective film 8 covers the facing surface 7a.
  • the reflection film 8 makes it possible to more efficiently reflect the fluorescent light toward the side wall surface of the phosphor layer 3 to the emission surface 9 side, thereby improving the light utilization efficiency.
  • FIG. 17 is a cross-sectional view showing a third example of the partition wall portion 7 of the fifth embodiment.
  • the resin partition walls 7 are not provided, and the phosphor layers and the diffusion layers of the respective colors are partitioned by a reflective film 8 having a hollow inside.
  • FIG. 18 is a cross-sectional view showing a fourth example of the partition wall 7 according to the fifth embodiment.
  • the partition wall 7 is formed in a partial cylindrical shape.
  • the cross-sectional shape of the partition wall portion 7 is gradually reduced from the light source side toward the emission surface side.
  • the partition wall portion 7 has a shape that tapers from the emission surface 9 side toward the light source side.
  • a reflective film 8 is formed on a portion of the partition wall 7 that does not contact the phosphor layer 3. When the fluorescence emitted from the phosphor layer 3 is reflected by the reflective film 8, it proceeds toward the exit surface 9 side.
  • the emission angle of the fluorescence from the phosphor layer 3 can be optimized by adjusting the shape of the partition wall 7.
  • the luminous intensity polar angle distribution of the emitted light from the phosphor can satisfy the conditional expression shown in the first or second embodiment.
  • FIG. 19 is a graph showing measured values of the luminous intensity distribution of the emitted light from the phosphor layer 3 arranged between the partition walls 7 shown in FIG.
  • the horizontal axis indicates the polar angle
  • the vertical axis indicates the relative luminous intensity.
  • the luminous intensity l ⁇ of the emitted light indicated by the solid line in FIG. Is in the range of 0.90 times to 1.10 times of A ⁇ cos ⁇ in the range of ⁇ 85 ° to 85 °. Therefore, since the luminous intensity l ⁇ of the light emitted from the phosphor layer 3 at the polar angle ⁇ satisfies the conditional expression shown in the first embodiment, it can be evaluated that the display device 200 has uniform luminance regardless of the viewing angle. . Therefore, the display device 200 with uniform brightness regardless of the observation angle can be realized, and the display device 200 with uniform brightness can be intentionally manufactured.
  • FIG. 20 is a cross-sectional view showing a display device 200 according to the sixth embodiment.
  • the display device 200 according to the sixth embodiment has basically the same configuration as that of the display device according to the fifth embodiment shown in FIG. Is different in that
  • the low refractive index material layer 11 is provided on the display side with respect to the phosphor layer 3.
  • the low refractive index material layer 11 has a refractive index smaller than that of the phosphor layer 3.
  • the material for forming the low refractive index material layer 11 is a material having a relatively low refractive index as compared with the material for forming the phosphor layer 3.
  • the low refractive index material layer 11 can be formed using a material having a refractive index of 1.26.
  • FIG. 21 is an enlarged sectional view showing the phosphor layer 3 of the sixth embodiment.
  • the light incident at a large incident angle on the interface between the phosphor layer 3 and the low refractive index material layer 11 out of the fluorescence emitted isotropically from the phosphor included in the phosphor layer 3 is , Total reflection at the interface.
  • the critical angle at the interface between the phosphor layer 3 and the low refractive index material layer 11 is determined according to Snell's law based on the difference in refractive index of the forming material between the phosphor layer 3 and the low refractive index material layer 11.
  • the light incident on the interface at a predetermined incident angle larger than the critical angle is totally reflected.
  • the totally reflected fluorescence propagates in the phosphor layer 3, reaches the facing surface 7 a of the partition wall 7, is reflected by the reflecting film 8 formed on the facing surface 7 a, and then is emitted to the emitting surface 9 side.
  • the low refractive index material layer 11 passes through the low refractive index material layer 11 by adjusting the refractive index of the forming material of the low refractive index material layer 11 and the shape of the partition wall portion 7.
  • the emission angle of the emitted fluorescence can be optimized.
  • the luminous intensity polar angle distribution of the emitted light from the phosphor can satisfy the conditional expression shown in the first or second embodiment. Therefore, the display device 200 with uniform brightness regardless of the observation angle can be realized, and the display device 200 with uniform brightness can be intentionally manufactured.
  • the fluorescence totally reflected by the low refractive index material layer 11 is light that is confined in the transparent substrate 4 and is not emitted from the emission surface 9 when there is no low refractive index material layer 11. Since such fluorescence can be used, the light utilization efficiency of the display device 200 is improved, and the display device 200 can be turned on with less power consumption.
  • FIG. 22 is a cross-sectional view showing display device 200 according to the seventh embodiment.
  • the display device 200 according to the seventh embodiment has a configuration basically the same as that of the display device according to the fifth embodiment shown in FIG. Is different in that
  • the diffusion layer 12 is provided on the display side or the light source side with respect to the phosphor layer 3 and has a characteristic of diffusing light incident on the diffusion layer 12.
  • FIG. 22 shows an example in which a diffusion layer 12 is provided on the exit surface 9 side with respect to the low refractive index material layer 11 of the display device of Embodiment 6.
  • the material for forming the diffusion layer 12 may be, for example, a diffusion sheet, a diffusion plate, or a white ink material.
  • a material for the diffusion sheet or the diffusion plate for example, polypropylene can be considered.
  • the display device 200 having such a structure, when the diffusion layer 12 is provided on the emission surface 9 side with respect to the phosphor layer 3, the emission light from the phosphor layer 3 is completely diffused in the diffusion layer 12.
  • the luminous intensity polar angle distribution of the light emitted from the phosphor can satisfy the conditional expression shown in the first or second embodiment. In this method, even if blue light is not completely diffused in the diffusion layer 6 of the blue pixel, it is possible to assist the scattering of the blue light in the diffusion layer 12 and complete diffusion.
  • the luminous intensity polar angle distribution of the emitted light from the phosphor satisfies the conditional expression shown in the first or second embodiment, but the diffusion in the blue pixel is insufficient, the light source side with respect to the phosphor layer 3 is used.
  • the diffusion layer 12 By providing the diffusion layer 12 on the surface, it is possible to assist the diffusion of the blue pixels, and the luminous intensity polar angle distribution of the blue light can satisfy the conditional expression shown in the first or second embodiment.
  • the display device 200 with uniform brightness regardless of the observation angle can be realized, and the display device 200 with uniform brightness can be intentionally manufactured.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un procédé d'évaluation d'un dispositif d'affichage grâce auquel il est possible d'évaluer si le dispositif d'affichage fournit une luminosité uniforme indépendamment de l'angle d'observation. Dans un procédé d'évaluation d'un dispositif d'affichage comprenant une source de lumière qui émet de la lumière et une couche de luminophore contenant un luminophore qui émet une fluorescence lors de l'absorption de la lumière émise par la source de lumière, une évaluation est faite de façon à savoir si, dans une plage de -85° ≦ θ ≦ 85°, l'angle polaire (θ) et l'intensité (Iθ) de la lumière émise par la couche de luminophore à l'angle polaire (θ) satisfont 0,90.A.cosθ ≦ lθ ≦ 1,10.A.cosθ par rapport à un nombre réel arbitraire (A) qui est dans la plage d'au moins 0,91 fois mais pas plus de 1,11 fois l'intensité de la lumière émise par la couche de luminophore à l'angle polaire 0°.
PCT/JP2013/064843 2012-06-01 2013-05-29 Procédé d'évaluation de dispositif d'affichage, et dispositif d'affichage WO2013180152A1 (fr)

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JP2012125879A JP2015155929A (ja) 2012-06-01 2012-06-01 表示装置の評価方法および表示装置
JP2012-125879 2012-06-01

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WO2013180152A1 true WO2013180152A1 (fr) 2013-12-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017021295A (ja) * 2015-07-14 2017-01-26 大日本印刷株式会社 量子ドットシート、バックライト及び液晶表示装置
CN113272728A (zh) * 2018-11-30 2021-08-17 康宁公司 滤色器lcd上的增强性量子点

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10207395A (ja) * 1997-01-27 1998-08-07 Toray Ind Inc 自発光ディスプレイ
JP2001083501A (ja) * 1999-09-14 2001-03-30 Toray Ind Inc 自発光ディスプレイ
JP2009244383A (ja) * 2008-03-28 2009-10-22 Fujifilm Corp 液晶表示装置
JP2010078761A (ja) * 2008-09-25 2010-04-08 Seiko Epson Corp 表示装置および電子機器
WO2011129135A1 (fr) * 2010-04-14 2011-10-20 シャープ株式会社 Substrat fluorescent et son procédé de production, et dispositif d'affichage
WO2011145247A1 (fr) * 2010-05-18 2011-11-24 シャープ株式会社 Dispositif d'affichage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10207395A (ja) * 1997-01-27 1998-08-07 Toray Ind Inc 自発光ディスプレイ
JP2001083501A (ja) * 1999-09-14 2001-03-30 Toray Ind Inc 自発光ディスプレイ
JP2009244383A (ja) * 2008-03-28 2009-10-22 Fujifilm Corp 液晶表示装置
JP2010078761A (ja) * 2008-09-25 2010-04-08 Seiko Epson Corp 表示装置および電子機器
WO2011129135A1 (fr) * 2010-04-14 2011-10-20 シャープ株式会社 Substrat fluorescent et son procédé de production, et dispositif d'affichage
WO2011145247A1 (fr) * 2010-05-18 2011-11-24 シャープ株式会社 Dispositif d'affichage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017021295A (ja) * 2015-07-14 2017-01-26 大日本印刷株式会社 量子ドットシート、バックライト及び液晶表示装置
CN113272728A (zh) * 2018-11-30 2021-08-17 康宁公司 滤色器lcd上的增强性量子点

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