WO2021261191A1 - Dispositif d'affichage et dispositif d'affichage de type composite - Google Patents

Dispositif d'affichage et dispositif d'affichage de type composite Download PDF

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Publication number
WO2021261191A1
WO2021261191A1 PCT/JP2021/021052 JP2021021052W WO2021261191A1 WO 2021261191 A1 WO2021261191 A1 WO 2021261191A1 JP 2021021052 W JP2021021052 W JP 2021021052W WO 2021261191 A1 WO2021261191 A1 WO 2021261191A1
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Prior art keywords
display device
hole
light emitting
emitting element
cavity
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PCT/JP2021/021052
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English (en)
Japanese (ja)
Inventor
昌哉 玉置
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京セラ株式会社
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Publication of WO2021261191A1 publication Critical patent/WO2021261191A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements

Definitions

  • the present disclosure relates to a display device and a composite display device provided with a self-luminous element such as a light emitting diode (LED) element.
  • a self-luminous element such as a light emitting diode (LED) element.
  • Patent Document 1 describes a light emitting display device provided with a self-luminous element of the prior art.
  • the display device of the present disclosure includes a display surface, a cavity structure including a plurality of cavities existing on the display surface, and light emitting elements located in each of the plurality of cavities, and the plurality of cavities. Is a configuration including an inclined cavity in which the axis is inclined.
  • the composite display device of the present disclosure is a composite display device including a plurality of the display devices and in which opposite side portions of the plurality of display devices are connected to each other, and the plurality of display devices are adjacent to each other.
  • the first display device includes a first display device and a second display device to be combined, the first display device has the first outermost array portion located on the side of the side portion to be combined, and the second display device has the second display device.
  • the configuration is such that the first outermost array portion is located on the side of the side portion to be connected.
  • FIG. 3 is an exploded cross-sectional view of the composite display device shown in FIG. 1. It is a top view of the display device of embodiment of this disclosure. It is a top view which shows the wiring structure of the substrate about the display device of embodiment of this disclosure. It is a top view of the light guide member mounted on the substrate about the display device of the embodiment of this disclosure.
  • FIG. 6 is a cross-sectional view showing the light reflection direction of the light guide member manufactured by the manufacturing method of FIGS. 6A to 6C by the inclined through hole of the light guide member. It is a partially enlarged sectional view which shows the display device in the manufacturing process about the display device of another embodiment of this disclosure. It is an enlarged sectional view which shows the display device in the manufacturing process about the display device of another embodiment of this disclosure. It is an enlarged sectional view which shows the display device in the manufacturing process about the display device of another embodiment of this disclosure. It is an enlarged sectional view which shows the display device in the manufacturing process about the display device of another embodiment of this disclosure. It is an enlarged sectional view which shows the display device in the manufacturing process about the display device of another embodiment of this disclosure.
  • the configuration on which the display device of the present disclosure is based is described.
  • the light-emitting display device described in Patent Document 1 described above is composed of a substrate on which a plurality of light-emitting diodes are fixed at predetermined intervals, and a white synthetic resin in which openings are provided at positions corresponding to the light-emitting diodes.
  • An inclined side surface is formed in the partition wall between the openings, and the light emitted from the light emitting diode is reflected by the side surface to irradiate the light diffusion sheet located on the opening, and the light diffusion sheet is put into a light emitting state. ..
  • a plurality of display devices are arranged side by side and combined (also referred to as “tyling”), which is also called a multi-display.
  • the pixel pitch of the outermost array pixels (coupling portion pixels) located in the outermost array portion near the substrate of each display device is set to the inner array pixel (non-combined pixel) located in the inner array region inside those pixels.
  • the pixel pitch is the same as that of the combined portion pixel
  • a distance different from the pixel pitch of the non-combined portion pixel is generated between each of the two displayed devices to be coupled.
  • the continuity of the displayed image is likely to be impaired at the joint portion (tiling portion) between one display device and another display device adjacent thereto. This may be noticeable in a display device that displays a high-definition image. Therefore, there has been a demand for a technique capable of solving such a problem.
  • FIG. 1A is a partially enlarged cross-sectional view of the display device 1 of the embodiment of the present disclosure
  • FIG. 1B is a display device 1a, 1b (hereinafter, first display device 1a, second display device 1b) of another embodiment of the present disclosure. It is a partially enlarged sectional view which shows the structure in the vicinity of the joint part about the composite type display device 100 which combined (also referred to as). Note that FIG. 1B is schematically shown for ease of illustration.
  • the composite display device 100 is one by combining (hereinafter, also referred to as “tiling”) a plurality of display devices 1a, 1b, ... (hereinafter, collectively referred to as “display device 1”). It is possible to construct a tiling panel or a multi-display that constitutes a large display surface.
  • the display device 1 of the present disclosure includes a second surface 4b of the light guide member 6 as a display surface, and a plurality of cavities Ca0, Ca1, Ca2 existing in the second surface 4b.
  • the cavity structure 10 and the light emitting elements 3 located in each of the plurality of cavities Ca0, Ca1 and Ca2 are provided, and the plurality of cavities Ca0, Ca1 and Ca2 have inclined cavities Ca1 and Ca2 in which the axes 56x and 57x are inclined. It is a configuration including.
  • cavities Ca when a plurality of cavities Ca0, Ca1, and Ca2 are generically referred to, they are referred to as cavities Ca.
  • the display device 1 of the present disclosure has the following effects due to the above configuration. Since the plurality of cavities Ca0, Ca1, Ca2 include the inclined cavities Ca1 and Ca2 whose axial centers 56x and 57x are inclined, the light emitted from the light emitting element 3 located in the inclined cavities Ca1 and Ca2 is the inclined cavities Ca1 and Ca2. It is radiated to the outside with a synchrotron radiation intensity distribution having a spread according to Lambert's cosine law, which has the maximum intensity in the direction of the inclined axis 56x, 57x. As a result, the viewing angle range of the displayed image can be widened.
  • second surface 2b when there is a display surface (second surface 2b) and its surroundings that do not need to be visually recognized when displaying an image, for example, electrodes and wiring having light reflectivity, or a tying portion having a color such as black.
  • the tilted axial centers 56x and 57x of the tilted cavities Ca1 and Ca2 can be tilted toward the parts that do not require visual recognition. As a result, it is possible to prevent the parts that do not need to be visually recognized from being conspicuous when displaying the image.
  • Each of the cavities Ca0, Ca1, and Ca2 has a through hole 5 (55, 56, 57) formed in the light guide member 6 (corresponding to a side surface of the cavity Ca0, Ca1, Ca2) and one surface of the substrate 2.
  • 2a includes a mounting portion of the light emitting element 3 (corresponding to the bottom surface of the cavities Ca0, Ca1, and Ca2).
  • the non-tilted cavity (upright cavity) Ca0 includes a non-tilted through hole (upright through hole) 55
  • the inclined cavities Ca1 and Ca2 include inclined through holes 56 and 57.
  • the inclined cavities Ca1 and Ca2 need only have their axes 56x and 57x deviated from the normal of one surface 2a, and are therefore inclined with respect to the normal.
  • the axis 55x is not tilted with respect to the normal of one surface 2a.
  • the axis 55x of the non-tilted cavity Ca0 includes the center 7o of the first opening 7 on the first surface 4a side of the non-tilted cavity Ca0 and the center 8o of the second opening 8 on the second surface 4b side of the non-tilted cavity Ca0. It is defined by the line connecting.
  • the axial center 56x of the inclined cavity Ca1 is a line connecting the center 7o of the first opening 7 on the first surface 4a side of the inclined cavity Ca1 and the center 8ao of the second opening 8a on the second surface 4b side of the inclined cavity Ca1. Specified by.
  • the axial center 57x of the inclined cavity Ca2 is a line connecting the center 7o of the first opening 7 on the first surface 4a side of the inclined cavity Ca2 and the center 8bo of the second opening 8b on the second surface 4b side of the inclined cavity Ca2. Specified by.
  • the tilt angle with respect to one main surface 2a of the tilt cavities Ca1 and Ca2 may be, for example, 60 ° or more and less than 90 °, and further may be 70 ° or more and 85 ° or less.
  • the tilting directions of the axial centers 56x and 57x of the tilted cavities Ca1 and Ca2 may be different from each other, for example, opposite directions when the range of the viewing angle of the displayed image is widened.
  • the inclination direction of the inclined cavity Ca1 may be the edge side of the substrate 2
  • the inclination direction of the inclined cavity Ca2 may be the opposite side to the edge of the substrate 2.
  • the inclined directions of the axial centers 56x and 57x may be random.
  • the inclined axial centers 56x and 57x of the inclined cavities Ca1 and Ca2 may be inclined toward the unseen parts.
  • the plurality of cavities Ca0, Ca1 and Ca2 may be configured to include inclined cavities Ca1 and Ca2 at a ratio of half or more. In this case, it becomes easy to uniformly widen the viewing angle range of the displayed image in all directions.
  • the number of the plurality of cavities Ca0, Ca1, and Ca2 corresponds to the number of pixels, and is about 1000 to 100,000 or 100,000 or more, and more than half of them are inclined cavities Ca1.
  • Ca2 may be used.
  • the inclined directions of the plurality of inclined cavities Ca1 and Ca2 may be non-uniform (random). In this case, it becomes easier to uniformly widen the viewing angle range of the displayed image in all directions.
  • the number of inclined cavities Ca1 and the number of inclined cavities Ca2 inclined in a direction different from the inclined direction of the inclined cavity Ca1 may be substantially the same. In this case, it becomes easier to uniformly widen the viewing angle range of the displayed image in all directions.
  • the tilting direction of the tilted cavity Ca2 may differ from the tilting direction of the tilted cavity Ca1 by 45 °, 315 °, 60 °, 300 °, 180 ° in a plan view, but is not limited to these angles.
  • the inclined cavity Ca2 having a plurality of types of inclined directions may be provided.
  • the number of inclined cavities Ca1 and the number of inclined cavities Ca2 may not be completely the same, and the ratio of the number of inclined cavities Ca2 to the number of inclined cavities Ca1 may be about 0.8 to 1.2. , Not limited to this range.
  • the number of tilted cavities Ca2 whose tilting direction differs from the tilting direction of the tilted cavity Ca1 in a plan view by 45 °, the number of tilted cavities Ca2 differing by 315 °, and the number of tilted cavities Ca2 differing by 180 ° are substantially the same. You may. In this case, it becomes easier to uniformly widen the viewing angle range of the displayed image in all directions.
  • the number of inclined cavities Ca2 having different inclination directions may not be completely the same, and the ratio of the numbers may be about 0.8 to 1.2, but is not limited to this range.
  • the plurality of cavities Ca0, Ca1 and Ca2 include a non-tilted cavity Ca0 in which the axis 55x is not inclined, and the light emitting element 3 includes a first light emitting element and a second light emitting element having a longer emission wavelength than the first light emitting element.
  • the first light emitting element may be located in the inclined cavity Ca1 and Ca2, and the second light emitting element may be located in the non-inclined cavity Ca0.
  • the light (light wave) emitted from the light emitting element 3 may be diffracted at the edge of the opening 8 when emitted from the cavity Ca to the outside, and the diffraction angle becomes larger as the wavelength of the light wave becomes longer.
  • the viewing angle is uniform as a whole of the display surface.
  • the first light emitting element is a blue light emitting element 3 (emission wavelength is about 430 nm to about 490 nm)
  • the second light emitting element is a green light emitting element 3 (emission wavelength is about 490 nm to about 555 nm). You may.
  • the second light emitting element is a red light emitting element 3 (emission wavelength is about 640 nm to about 770 nm). good.
  • the plurality of cavities Ca0, Ca1 and Ca2 include a non-tilted cavity Ca0 in which the axis 55x is not inclined, and the light emitting element 3 includes a third light emitting element and a fourth light emitting element having higher visual sensitivity than the third light emitting element.
  • the third light emitting element may be located in the inclined cavity Ca1 and Ca2, and the fourth light emitting element may be located in the non-inclined cavity Ca0.
  • the luminosity factor of light is also called the spectral luminosity factor or the luminosity factor. It is the value that was set.
  • the luminosity factor of blue light is about 0.01 to about 0.4
  • the luminosity factor of green light is about 0.4 to about 1.0
  • the luminosity factor of red light is about 0.1 to about. It is 0.01.
  • Luminosity factor is higher in the order of green light, blue light, and red light. Therefore, by locating the third light emitting element in the tilted cavities Ca1 and Ca2 and locating the fourth light emitting element having higher visual sensitivity than the third light emitting element in the non-tilted cavity Ca0, the third light emitting element having low visual sensitivity The range of viewing angles can be expanded. As a result, it is possible to prevent the emission color of the third light emitting element from becoming inconspicuous.
  • the fourth light emitting element may be a blue light light emitting element 3 or a green light light emitting element 3.
  • the third light emitting element is the light emitting element 3 of blue light
  • the fourth light emitting element may be the light emitting element 3 of green light.
  • the size (opening area) of the upper opening (second opening 8a, 8b) of the inclined cavities Ca1 and Ca2 and the size (opening area) of the upper opening (second opening 8) of the non-tilted cavity Ca0 are It may be different.
  • the size of the upper opening of the inclined cavities Ca1 and Ca2 may be larger than the size of the upper opening of the non-inclined cavities Ca0.
  • the light (external radiated light) emitted from the light emitting element located in the inclined cavities Ca1 and Ca2 spreads according to Lambert's cosine law, which has the maximum intensity in the inclined axial direction of the inclined cavities Ca1 and Ca2.
  • the size of the upper opening of the inclined cavities Ca1 and Ca2 may be more than 1 times and not more than 2 times the size of the upper opening of the non-inclined cavities Ca0, but is not limited to this range.
  • the shape of the upper opening (second opening 8a, 8b) of the inclined cavities Ca1 and Ca2 may be different from the shape of the upper opening (second opening 8) of the non-tilted cavity Ca0.
  • the shape of the upper opening of the inclined cavities Ca1 and Ca2 is an elliptical shape, an oval shape, a rectangle, a rhombus, or the like whose length in the inclined direction is longer than the length in the direction orthogonal to the inclined direction in a plan view. You may.
  • the shape of the upper opening (second opening 8) of the non-tilted cavity Ca0 may be a symmetrical shape such as a circle or a square in a plan view.
  • the light radiated from the light emitting element located in the inclined cavities Ca1 and Ca2 is the synchrotron radiation having the maximum intensity in the inclined axial direction of the inclined cavities Ca1 and Ca2 and having a spread according to Lambert's cosine law. It is radiated to the outside with an intensity distribution, but the spread of external radiated light in the direction of inclination becomes larger. As a result, the range of the viewing angle of the displayed image can be further expanded.
  • the plurality of cavities Ca are a first cavity Ca11 located closest to the edge of the display surface (second surface 4b) and a first cavity on the display surface.
  • the first cavity Ca11 includes a second cavity Ca12 located inside the Ca11, the first cavity Ca11 is an inclined cavity whose upper side is inclined toward the edge of the display surface, and the second cavity Ca12 has an inclined center of axis. It may be configured as a non-tilted cavity.
  • the display device 1 of the present disclosure includes a cavity structure 10 having a second surface 4b of the light guide member 6 as a display surface and through holes 5 as a plurality of cavities Ca existing on the second surface 4b.
  • the light emitting elements 3 located at each of the plurality of through holes 5 are provided, and the plurality of through holes 5 include a first through hole 51 located closest to the end edge of the second surface 4b and a second surface 4b.
  • the first through hole 51 includes a second through hole 52 located inside the first through hole 51 in the above, and the first through hole 51 is an inclined through hole whose upper side is inclined toward the end edge of the second surface 4b.
  • the 2 through hole 52 may be configured to be a non-inclined through hole.
  • the above configuration has the following effects.
  • the light radiated to the outside from the light emitting element 3 located in the first through hole 51 is inclined toward the edge side of the second surface 4b and radiated.
  • the end edge portion (tiling portion) of the second surface 4b is covered with the inclined synchrotron radiation, so that the viewer It becomes difficult to see. Therefore, since the continuity of the display image is easily maintained at the joint portion between the display devices 1, it is possible to configure the composite display device 100 capable of displaying a high-definition image with high display quality on a large screen.
  • the second through hole 52 located inside the first through hole 51 of the second surface 4b is a non-tilted through hole, it is possible to display an image with less distortion, luminance unevenness, etc. as a whole.
  • the cavity Ca is composed of a through hole 3 and an exposed portion (mounting portion) of one surface 2a of the substrate 2. That is, the mounting portion corresponds to the bottom surface of the cavity Ca, and the through hole 3 corresponds to the side surface of the cavity Ca. Further, the second surface 4b of the light guide member 3 as a display surface is a viewing surface that is visually recognized by an external viewer, and is a surface on the display side.
  • the cavity structure 10 is located on the substrate 2 and one surface 2a of the substrate 2, and the first surface facing the one surface 2a.
  • a light guide member 6 having a second surface 4b opposite to the first surface 4a and the first surface 4a, and a plurality of through holes penetrating from the first surface 4a to the second surface 4b and arranged in a matrix at intervals.
  • the light emitting element 3 is located at a portion exposed by the through hole 5 on the one side surface 2a.
  • the plurality of through holes 5 include a first through hole 51 located in the first outermost arrangement portion A1 arranged closest to the end edge of the light guide member 6, and a first outermost arrangement portion of the light guide member 6.
  • the first through hole 51 includes the second through hole 52 located inside the A1, and the first through hole 51 is the center of the second opening 8a on the second surface 4b side with respect to the center 7o of the first opening 7 on the first surface 4a side.
  • 8ao may be an inclined through hole closer to the edge of the light guide member 6, and the second through hole 52 may be a non-inclined through hole.
  • the above configuration has the following effects.
  • the light radiated to the outside from the light emitting element 3 located in the first through hole 51 is inclined toward the edge of the light guide member 6 and radiated.
  • the end edge portion (tiling portion) of the coupled light guide member 6 is covered with the inclined synchrotron radiation. Therefore, it becomes difficult for the viewer to see it. Therefore, since the continuity of the display image is easily maintained at the joint portion between the display devices 1a and 1b, it is possible to configure the composite display device 100 capable of displaying a high-definition image with high display quality on a large screen. ..
  • the second through hole 52 located inside the first outermost array portion A1 of the light guide member 6 is a non-inclined through hole, it is possible to display an image with less distortion, luminance unevenness, etc. as a whole. ..
  • the display device 1 includes a substrate 2 having one surface 2a and the other surface 2b opposite to the one surface 2a, and a plurality of light emitting elements arranged two-dimensionally in a matrix with a first interval L1 on the one surface 2a. 3 and a first surface 4a laminated on one surface 2a and facing the one surface 2a and a second surface 4b opposite to the first surface 4a, and a plurality of light emitting elements 3 are individually located.
  • the plurality of through holes 5 have a first opening 7 that opens on the first surface 4a of the light guide member 6 and a second opening 8 that opens on the second surface 4b.
  • the first opening 7 is formed on the first surface 4a with a first interval L1 from each other.
  • a first interval L1 is a color image display of red light (R), green light (G), and blue light (B)
  • the second opening 8 is formed on the second surface 4b with a first interval L1 from each other.
  • the first interval L1 is the distance between the centers 8o of the openings of the adjacent second openings 8 (inter-center distance).
  • the third interval L1 is the distance between the centers 7o of the openings of the adjacent first openings 7 (inter-center distance).
  • the first spacing L1 is substantially equal to the third spacing L1 in the non-tilted through hole 51 located inside the first outermost array portion A1 of the light guide member 6.
  • the center 7o of the opening of the first opening 7 and the center 8o of the opening of the second opening 8 may be defined as a geometric center.
  • the center of the opening may be the intersection of two diagonal lines, and when the shape of the opening is circular, the center of the opening may be the center of the circle.
  • the center of the opening may be the intersection of the major axis and the minor axis.
  • the shape of the opening may be various shapes such as circular, oval, rectangular, hexagonal, and petal, but symmetrical shapes such as point symmetry and line symmetry are preferable. In that case, there is an effect that the intensity distribution of the light radiated from the aperture is less likely to be biased.
  • the first through hole 51 has a light guide on the upper side as a whole because the center 8ao of the second opening 8a is closer to the edge of the light guide member 6 than the center 7o of the first opening 7. It is inclined toward the edge side of the member 6.
  • the angle formed by the line segment connecting the center 8ao and the center 7o and the one surface 2a of the substrate 2 (referred to as an angle ⁇ 1) is displayed while the synchrotron radiation from the second opening 8a covers the edge of the light guide member 6.
  • the angle may be such that the viewer who sees the surface from almost the front does not feel a sense of discomfort such as distortion of the image.
  • the angle ⁇ 1 may be, for example, 60 ° or more and less than 90 °, and may be 70 ° or more and 85 ° or less.
  • the angle between the line segment connecting the center 8ao and the center 7o and the one surface 2a of the substrate 2 of the second through hole 52 is approximately 90 °.
  • the first through hole 51 located in the first outermost array portion A1 has an edge-to-edge distance (also referred to as a second spacing) L2 between the center 8ao of the second opening 8a and the edge of the light guide member 6.
  • the configuration may be shorter than the center-to-center distance (first interval L1) between the second openings 8 of the adjacent second oblique through holes 52.
  • the second interval L2 may be 40% or more and 60% or less of the first interval L1.
  • the plurality of through holes 5 include a third through hole 53 adjacent to the first outermost arrangement portion A1 and located in the second outermost arrangement portion A2 inside the first outermost arrangement portion A1, and the third through hole 5.
  • 53 may be configured to be an inclined through hole.
  • the third through hole 53 constitutes a third cavity Ca13 which is an inclined cavity.
  • the inclination angle ( ⁇ 1) of the first through hole 51 may be larger than the inclination angle ( ⁇ 2) of the third through hole 53.
  • the light emitted from the third through hole 53 is emitted so as to cover the light emitted from the first through hole 51 (overlap on the upper side).
  • the angle ⁇ 2 may be, for example, 70 ° or more and less than 90 °, and may be 75 ° or more and 85 ° or less.
  • the plurality of through holes 5 have the same distance between the first centers (corresponding to the third interval L3) between the adjacent first openings 7, and are the center 8ao and the first of the second openings 8a of the first through holes 51.
  • the second center-to-center distance between the center 8o of the second opening 8 of the second oblique through-hole 52 adjacent to the through-hole 51 may be longer than the first center-to-center distance.
  • the pitch of the arrangement of the plurality of light emitting elements 3 can be made the same, and only the second opening 8a of the first through hole 51 can be brought closer to the end edge side of the light guide member 6. As a result, it is possible to suppress the occurrence of image distortion, luminance bias, and the like.
  • FIG. 2 is an exploded cross-sectional view of the composite display device 100 shown in FIG. 1B.
  • One surface 2a and the other surface 2b of the substrate 2 are parallel to each other, and the first surface 4a and the second surface 4b of the light guide member 6 are parallel to each other.
  • the shape of the first opening 7 and the shape of the second opening 8 may be similar.
  • the opening area of the second opening 8 is larger than the opening area of the first opening 7, and therefore the through hole 5 has a shape in which the opening area gradually increases from the first opening 7 to the second opening 8.
  • the light emitting element 3 may be a self-luminous element such as a light emitting diode (Light Emitting Diode: LED) element, an organic light emitting diode (Organic Light Emitting Diode: OLED) element, or a semiconductor laser (Laser Diode: LD) element.
  • the light emitting element 3 is an LED element, and a case where a micro light emitting diode element (also referred to as “ ⁇ LED element”) is used as the LED is described as an example.
  • the ⁇ LED element may have a rectangular shape having a side length of about 1 ⁇ m or more and about 100 ⁇ m or less when viewed from above in FIG. 1B, and a rectangular shape having a side length of about 5 ⁇ m or more and about 20 ⁇ m or less. It may be in shape.
  • FIG. 3 is a plan view showing the appearance of the display device 1
  • FIG. 4 is a plan view showing the wiring structure of the substrate 2
  • FIG. 5 is a plan view of the light guide member 6 mounted on the substrate 2 as viewed from above. It is a figure.
  • An anode electrode 31 and a cathode electrode 32 are formed on one surface 2a of the substrate 2 of the display device 1.
  • the anode electrode 31 is electrically connected to the anode terminal of the light emitting element 3
  • the cathode electrode 32 is electrically connected to the cathode terminal of the light emitting element 3.
  • the anode electrode 31 and the cathode electrode 32 are connected to a drive circuit (not shown) that controls light emission, non-light emission, light emission intensity, and the like of the light emitting element 3.
  • the drive circuit includes a thin film transistor (TFT), a wiring conductor, and the like.
  • the TFT has, for example, a semiconductor film (also referred to as a channel) made of amorphous silicon (a-Si), low-Temperature Poly Silicon (LTPS), or the like, and has three of a gate electrode, a source electrode, and a drain electrode. It may be configured to have terminals.
  • the TFT functions as a switching element that switches between conduction and non-conduction between the source electrode and the drain electrode according to the voltage applied to the gate electrode.
  • the drive circuit may be arranged on the substrate 2, and may be arranged between layers of a plurality of insulating layers composed of silicon oxide (SiO 2 ), silicon nitride (Si 3 N 4), etc. arranged on the substrate 2. May be good.
  • a drive circuit may be formed by a thin film forming method such as a chemical vapor deposition (CVD method). Further, the drive circuit may be arranged on a frame portion or the like on one surface 2a of the substrate 2, or may be arranged on the other surface 2b.
  • the light emitting element 3 and the anode electrode 31 and the cathode electrode 32 are flip-chip mounted using a conductive connecting material such as an anisotropic conductive film (Acisotropic Film: ACF), a solder ball, a metal bump, or a conductive adhesive. By law, they may be electrically and mechanically connected.
  • ACF anisotropic conductive film
  • solder ball solder ball
  • metal bump metal bump
  • a conductive adhesive a conductive adhesive
  • the substrate 2 is made of, for example, a glass material, a ceramic material, a resin material, a metal material, a semiconductor material, or the like.
  • the glass material used for the substrate 2 may include, for example, borosilicate glass, crystallized glass, quartz and the like.
  • the ceramic material used for the substrate for example, any one of alumina (Al 2 O 3 ), zirconia (ZrO 2 ), silicon nitride (Si 3 N 4 ), silicon carbide (SiC), aluminum nitride (Al N) and the like.
  • the resin material used for the substrate 2 for example, any one of epoxy resin, polyimide resin, polyamide resin, acrylic resin, polycarbonate resin and the like can be used.
  • the metal material used for the substrate 2 examples include aluminum (Al), titanium (Ti), beryllium (Be), magnesium (Mg) (particularly preferably, a chemically stable Mg content% by mass). High-purity magnesium of 99.95% or more), zinc (Zn), tin (Sn), copper (Cu), iron (Fe), chromium (Cr), nickel (Ni), silver (Ag), etc. can.
  • the alloy material used for the substrate 2 is mainly composed of duralumin (Al—Cu alloy, Al—Cu—Mg alloy, Al—Zn—Mg—Cu alloy), which is an aluminum alloy containing aluminum as a main component, and magnesium. Examples thereof include magnesium alloys (Mg—Al alloys, Mg—Zn alloys, Mg—Al—Zn alloys), titanium boronized, stainless steel, Cu—Zn alloys and the like.
  • Examples of the semiconductor material used for the substrate 2 include silicon, germanium, gallium arsenide and the like.
  • an insulating layer made of silicon oxide (SiO 2 ), silicon nitride (Si 3 N 4 ) or the like is arranged on at least one surface 31a of the substrate 2, and the insulating layer is placed on the insulating layer.
  • the light emitting element 3 may be arranged. In this case, it is possible to prevent the anode terminal and the cathode terminal of the light emitting element 3 from being electrically short-circuited.
  • the light guide member 6 is made of, for example, a glass material, a ceramic material, a resin material, a metal material, an alloy material, a semiconductor material, or the like.
  • the glass material used for the light guide member 6 may include, for example, borosilicate glass, crystallized glass, quartz and the like.
  • the ceramic material used for the light guide member 6 may include, for example, alumina, zirconia, silicon nitride, silicon carbide, aluminum nitride and the like.
  • the resin material used for the substrate 2 may include, for example, an epoxy resin, a polyimide resin, a polyamide, an acrylic resin, a polycarbonate resin, or the like.
  • the metal material used for the light guide member 6 is, for example, aluminum (Al), titanium (Ti), beryllium (Be), magnesium (Mg) (particularly, chemically stable Mg content% by mass of 99.95). % Or higher purity magnesium), zinc (Zn), tin (Sn), copper (Cu), iron (Fe), chromium (Cr), nickel (Ni), silver (Ag), molybdenum (Mo), tungsten ( W) and the like may be included.
  • the alloy material used for the light guide member 6 is mainly composed of duralumin (Al—Cu alloy, Al—Cu—Mg alloy, Al—Zn—Mg—Cu alloy), which is an aluminum alloy containing aluminum as a main component, and magnesium.
  • Magnesium alloy (Mg-Al alloy, Mg-Zn alloy, Mg-Al-Zn alloy), copper alloy containing copper as the main component (Cu-Zn alloy, Cu-Zn-Ni alloy, Cu-Sn alloy, Cu) -Sn-Zn alloy), iron alloy containing iron as the main component (Fe-Ni alloy, Fe-Ni 36% alloy (Inver), Fe-Ni-Co alloy (Koval), Fe-Cr alloy, Fe-Cr-Ni Alloys), titanium boronized, etc.
  • the semiconductor material used for the light guide member 6 include silicon, germanium, gallium arsenide and the like.
  • the light guide member 6 may have a single-layer structure made of the above-mentioned glass material, ceramic material, resin material, metal material, alloy material, or semiconductor material, and the above-mentioned glass material, ceramic material, resin material, etc. It may have a laminated structure in which a plurality of layered bodies made of a metal material, an alloy material, or a semiconductor material are laminated.
  • the light guide member 6 is made of a conductive material such as a metal material or an alloy material, or a semi-conductive material as a semiconductor material
  • the light guide member 6 is made of silicon oxide (SiO 2 ), silicon nitride (Si 3 N 4 ), or the like. It may be connected to the substrate 2 via an insulating layer made of a material and an insulating member made of a resin material.
  • the through hole 5 can be formed by using, for example, a photolithography technique including an etching step.
  • a photolithography technique including an etching step.
  • an appropriate organic solvent and solvent are added and mixed with the raw material powder of the ceramic material to form a slurry, which is formed into a sheet by a well-known doctor blade method, calendar roll method, or the like.
  • a ceramic green sheet hereinafter, also referred to as a green sheet.
  • the green sheet is punched in order to have a predetermined shape having a hole to be a through hole 5.
  • a plurality of processed green sheets are laminated and simultaneously fired at a temperature of about 1600 ° C.
  • the light guide member 6 is made of a resin material, for example, an injection molding method can be used to manufacture the light guide member 6 provided with the through hole 5.
  • the light guide member 6 is made of a metal material or an alloy material
  • the light guide member 6 provided with the through hole 5 can be manufactured by using, for example, a punching method or an electric casting method (plating method).
  • the light guide member 6 is made of a semiconductor material
  • the light guide member 6 provided with the through hole 5 can be manufactured by using, for example, a dry etching method including an etching step.
  • the light guide member 6 may be configured such that at least a part of the light emitted from the light emitting element 3 is reflected twice or more on the inner surface 5a of the through hole 5. ..
  • the radiation intensity distribution of the light radiated to the outside from the through hole 5 is the normal direction of the second surface 4b and the normal direction of the bottom surface (one surface 2a) of the through hole 5 in the maximum intensity direction.
  • the shape can be made to be close to the shape of a vertically long cosine (cos ⁇ ) curved surface having high directionality, which almost coincides with the direction.
  • the radiation intensity distribution of the light radiated to the outside from the through hole 5 has a vertically long approximate cosine curved surface shape with high directivity according to Lambert's cosine law.
  • Lambert's cosine rule is that the radiation intensity of light observed in an ideal diffuse radiator is the normal of the radiation surface (in the display device 1 of the present embodiment, the second surface 4b and the bottom surface of the through hole 5). The rule is that it is directly proportional to the cosine of the angle ⁇ between them.
  • the cosine curved surface shape is a shape in which the shape of the radiation intensity distribution is a cosine curve when the radiation intensity distribution of light is viewed in a vertical cross section.
  • the front luminance of the display device 1 (the luminance measured on the front of the display device 1) is normalized to 1.0 when there is no through hole 5
  • the front luminance when there is a through hole 5 Can be increased to about 1.5 times to 2.0 times or more.
  • the front luminance when there is a through hole 5 can be set to about 1.5 times to 2.0 times or more and 5.0 times or less.
  • ⁇ a can be set to a predetermined angle or less.
  • the predetermined angle is an angle that is also determined by the radiation intensity distribution of the light emitting element 3.
  • the predetermined angle may be, for example, 30 °, 20 °, or 10 °.
  • At least a part of the light reflected twice or more by the inner surface 5a of the through hole 5 may include light emitted in the direction in which the radiation intensity in the radiation intensity distribution of the light emitting element 3 is maximum.
  • the amount of light emitted in the direction of the radiation angle ⁇ a or less with respect to the normal m1 of the virtual exit surface of the through hole 5 can be increased, and the light is emitted from the through hole 5.
  • the directivity of light can be further improved.
  • ⁇ b is the angle between the direction in which the radiation intensity is maximum in the radiation intensity distribution of the light emitting element 3 and the normal m2 of the portion exposed by the through hole 5 on one surface 2a
  • ⁇ b is about 20 ° to 60 °.
  • the light emitting element 3 may be, preferably about 30 ° to 50 °. In this case, most of the light emitted by the light emitting element 3, for example, 50% or more of the total amount of light, is likely to be reflected twice or more on the inner surface 5a of the through hole 5.
  • At least a part of the light reflected twice or more by the inner surface 5a of the through hole 5 may include 50% or more of the total amount of light emitted from the light emitting element 3.
  • the amount of light emitted in the direction of the radiation angle ⁇ a or less can be further increased, and the directivity of the light emitted from the display device 1 can be further improved.
  • the opening area Sc of the second opening 8 of the through hole 5 is more than 1 time and 1.5 times or less the opening area Sa of the first opening 7 of the through hole 5, and the depth of the through hole 5 is 1.
  • the configuration may be such that d is 2.5 times or more the absolute value of the square root of the opening area Sa of the first opening 7. According to such a configuration, since the through hole 5 has a vertically long shape, even when the radiation intensity distribution of the light emitted from the light emitting element 3 is narrow, that is, even when the range of the radiation angle ⁇ b is narrow.
  • the synchrotron radiation of the light emitting element 3 can be reflected twice or more on the inner surface 5a. As a result, the radiation angle of the light emitted from the through hole 5 can be reduced and the directivity can be increased.
  • the opening area Sa of the first opening 7 is Ls2 (Ls is the length of one side of the square), and the absolute value of the square root is Ls. That is, the depth d of the through hole 5 is 2.5 times or more the length of one side of the square. As described above, the depth d of the through hole 5 may be about 2.5 times or more the width of the first opening 7 of the through hole 5.
  • the cut margin (margin) of the side portion at the time of manufacturing the substrate 2 can be increased. That is, on one surface 2a of the substrate 2, the distance between the edge of the one surface 2a and the portion corresponding to the first opening 7o of the first through hole 51 is wider than in the case of the non-inclined through hole. Because.
  • the light guide member 6 provided with the through hole 5 for guiding the light of the light emitting element 3 may be another substrate or the like on which the above-mentioned drive circuit is mounted.
  • FIGS. 6A to 6C are cross-sectional views for explaining a method of manufacturing the light guide member 60 for the display device 1 of another embodiment of the present disclosure.
  • the same reference numerals will be used for the parts corresponding to the above-described embodiments.
  • a light guide member 60 composed of a plurality of layered bodies 61 laminated on one surface 2a of the substrate 2 by a diffusion bonding method is used.
  • the layered body 61 is made of a metal material, an alloy material, a semiconductor material, a glass material, a resin material, or the like as described above.
  • each of the plurality of layered bodies 61 can be produced, for example, by repeating film formation and etching on one surface 2a of the substrate 2, and at the same time, a through hole 5 can be formed. Further, each layered body 61 can be manufactured by repeating each step of etching and bonding diffusion, and a through hole 5 can be formed at the same time. By these methods, through holes 5 having different orientations (inclination angles) depending on the location can be easily formed on one surface 2a of the substrate 2.
  • the inner surface of the through hole 5 may be a light-reflecting inner surface 5a having a high light reflectance (light reflectance of about 80% or more).
  • the light-reflecting inner surface 5a may be formed of a reflective film or the like located on the inner surface of the through hole 5.
  • the light-reflecting inner surface 5a can be formed by mechanical mirror polishing when the layered body 61 is made of a metal material, an alloy material, or the like.
  • a reflective film made of a metal material, an alloy material, or the like having a high reflectance is formed by a thin film forming method such as a plating method, a CVD method, or a vapor deposition method. It may be formed on the inner surface of the through hole 5. Further, a reflective film may be formed by applying a resin paste containing light-reflecting particles such as silver to the inner surface of the through hole 5 and firing the paste. By forming the reflective film on the inner surface of the through hole 5, as shown in FIGS. 6C and 7, it is possible to eliminate the step between the layered bodies 61 and form the reflective film having a flat surface. As a result, it is possible to form an inner surface 5a having a high reflectance, which is close to specular reflection in which scattering and the like are unlikely to occur, that is, has high reflection performance.
  • FIGS. 8A to 8C are partially enlarged cross-sectional views showing the display device in the manufacturing process for the display device 1A of the other embodiments of the present disclosure, respectively.
  • the same reference numerals are given to the parts corresponding to the above-described embodiments.
  • the substrate 2 on which the two-dimensionally arranged light emitting elements 3 are mounted and the light guide member 6 having a plurality of through holes 5 are also provided. And have.
  • the through hole 5 has a translucent sealing member 73 made of a transparent resin or the like located inside. That is, the through hole 5 is sealed by the sealing member 73.
  • the transparent resin may be made of a resin material such as a silicone resin, an acrylic resin, or an epoxy resin, or may be made of a glass material.
  • the sealing member 73 has a shape complementary to the through hole 5, and may be inserted into the through hole 5 and arranged, and may be fixed to the through hole 5 via an adhesive. Further, the sealing member 73 is formed by arranging the above-mentioned uncured resin material in the through hole 5 and curing it by a heat curing method, a light irradiation curing method of irradiating ultraviolet light or the like, a heating light irradiation curing method, or the like. You may.
  • the first through hole 51 is formed not in the substrate 2 on which the light emitting element 3 is mounted but in the light guide member 6 which is separate from the substrate 2, so that the light guide member 6 is the first. 1 It can be a dedicated member for forming the through hole 51. Further, the substrate 2 can be a dedicated component for mounting the light emitting element 3 and providing a drive circuit, circuit wiring, and the like. Therefore, the productivity of the display device 1 can be improved.
  • the light guide member 6 constituting the cavity structure 10 may have a configuration in which a plurality of through holes 5 are formed in a transparent substrate made of a glass material, a transparent resin material, or the like.
  • a transparent display including a substrate 2 made of a transparent material such as a glass material and a light guide member 6 made of a transparent substrate.
  • a reflective member such as a reflective layer and a reflector that reflects a part of the synchrotron radiation of the light emitting element 3 toward the back surface (the other surface 2b) of the substrate 2 above the through hole 5
  • the display can be configured.
  • a light emitting element 3 (referred to as a light emitting element 3a) having no reflecting member above and a light emitting element 3 (referred to as a light emitting element 3b) having a reflecting member provided above. May be arranged alternately. Then, when displaying an image on the surface side, the light emitting element 3a is made to emit light and the light emitting element 3b is driven so as not to emit light. Further, when displaying an image on the back surface side, the light emitting element 3a is made non-light emitting and the light emitting element 3b is driven to emit light. When displaying an image on the front surface side and the back surface side, the light emitting element 3a and the light emitting element 3b are driven to emit light.
  • the composite display device 100 of the present disclosure is a composite display device including a plurality of display devices 1 in which facing side portions of the plurality of display devices 1 are connected to each other, and the plurality of display devices 1 are adjacent to each other.
  • the first display device 1a includes the first display device 1a and the second display device 1b to be coupled, and the first display device 1a has the first outermost array portion A1 located on the side of the side portion (side surface 6a) to be coupled.
  • the 2 display device 1b has a configuration in which the first outermost array portion A1 is located on the side of the side portion (side surface 6a) to be connected. That is, the first outermost arrangement portion A1 of the first display device 1a and the first outermost arrangement portion A1 of the second display device 1b are adjacent to each other.
  • the above configuration has the following effects.
  • the tilted synchrotron radiation from the first display device 1a and the tilted synchrotron radiation from the second display device 1b cover the binding site (tyling site) and make it difficult for the viewer to see. Therefore, since the continuity of the displayed image is easily maintained at the joint portion between the display devices, it is possible to provide a composite display device capable of displaying a high-definition image with high display quality on a large screen.
  • the plurality of cavities include an inclined cavity whose axis is inclined
  • the light emitted from the light emitting element located in the inclined cavity has the maximum intensity in the inclined axis direction of the inclined cavity.
  • It is radiated to the outside with a synchrotron radiation intensity distribution having a spread according to Lambert's cosine law.
  • the viewing angle range of the displayed image can be widened.
  • the inclined cavity is inclined.
  • the axial direction can be tilted toward the display-unnecessary portion. As a result, it is possible to prevent the display unnecessary portion from being conspicuous when displaying the image.
  • the light radiated to the outside from the light emitting element located in the first through hole is radiated at an angle toward the edge of the display surface.
  • the edge portion (tiling portion) of the display surface is covered with the tilted synchrotron radiation, which makes it difficult for the viewer to see. Become. Therefore, since the continuity of the displayed image is easily maintained at the joint portion between the display devices, it is possible to configure a composite display device capable of displaying a high-definition image with high display quality on a large screen.
  • the second through hole located inside the first through hole on the display surface is a non-tilted through hole, it is possible to display an image with less distortion, luminance unevenness, etc. as a whole.
  • a plurality of display devices include a first display device and a second display device which are connected adjacent to each other, and the first display device is on the side of the side to be combined. Since the first outermost arrangement part is located and the first outermost arrangement part is located on the side of the side to be combined in the second display device, the synchrotron radiation tilted by the first display device and the second display device are located.
  • the tilted synchrotron radiation from the display device covers the coupling site (tyling site) and makes it difficult for the viewer to see. Therefore, since the continuity of the displayed image is more easily maintained at the joint portion between the display devices, it is possible to provide a composite display device capable of displaying a high-definition image with high display quality on a large screen.
  • the display device and the composite display device of the present disclosure have been described in detail above, the display device and the composite display device of the present disclosure are not limited to the above-described embodiments, and the gist of the present disclosure is described. Various changes and improvements can be made within the range that does not deviate. Needless to say, all or part of each of the above embodiments can be combined as appropriate and within a consistent range.
  • the display device and the composite display device of the present disclosure can be applied to various electronic devices.
  • the electronic devices include automobile route guidance systems (car navigation systems), ship route guidance systems, aircraft route guidance systems, instrument indicators for vehicles such as automobiles, instrument panels, smartphone terminals, mobile phones, tablet terminals, and personals.
  • Digital assistants (PDAs) video cameras, digital still cameras, electronic notebooks, electronic books, electronic dictionaries, personal computers, copying machines, game device terminals, televisions, product display tags, price display tags, industrial programmable displays.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Ce dispositif d'affichage comprend : une structure de cavité ayant une seconde surface d'un élément de guidage de lumière en tant que surface d'affichage et une pluralité de cavités présentes dans la seconde surface ; et des éléments électroluminescents respectivement positionnés dans la pluralité de cavités, la pluralité de cavités comprenant des cavités inclinées dont les axes sont inclinés.
PCT/JP2021/021052 2020-06-26 2021-06-02 Dispositif d'affichage et dispositif d'affichage de type composite WO2021261191A1 (fr)

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JP2018527711A (ja) * 2015-09-02 2018-09-20 ルミレッズ ホールディング ベーフェー Ｌｅｄモジュール及び照明モジュール
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