WO2008032464A1 - Unité rétroéclairée, dispositif d'affichage à cristaux liquides et dispositif de jeu - Google Patents

Unité rétroéclairée, dispositif d'affichage à cristaux liquides et dispositif de jeu Download PDF

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Publication number
WO2008032464A1
WO2008032464A1 PCT/JP2007/058718 JP2007058718W WO2008032464A1 WO 2008032464 A1 WO2008032464 A1 WO 2008032464A1 JP 2007058718 W JP2007058718 W JP 2007058718W WO 2008032464 A1 WO2008032464 A1 WO 2008032464A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
backlight unit
reflection
Prior art date
Application number
PCT/JP2007/058718
Other languages
English (en)
Japanese (ja)
Inventor
Munetoshi Ueyama
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2008032464A1 publication Critical patent/WO2008032464A1/fr

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
    • G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
    • G07F17/3202—Hardware aspects of a gaming system, e.g. components, construction, architecture thereof
    • G07F17/3204—Player-machine interfaces
    • G07F17/3211—Display means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • Nocrite unit liquid crystal display device, and game device
  • the present invention relates to a knock light unit, a liquid crystal display device including the backlight unit, and a gaming device including the liquid crystal display device.
  • variable display game apparatuses Conventionally, slot machines and the like have been widely used as variable display game apparatuses.
  • a plurality of variable display portions (reels) are made visible through an opening provided in a light guide plate of a mounted liquid crystal display device (Patent Documents 1 to 3, etc.).
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-298542
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2004-329687
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2004-344645
  • a liquid crystal display device realizes display by guiding light having a light source power such as a cathode ray tube to a liquid crystal display panel through a light guide plate of a backlight unit. Therefore, the luminance of the liquid crystal display device changes according to the light guide plate power and the amount of light guided to the liquid crystal display panel. Then, it is not preferable that the light guide plate force loses the amount of light guided to the liquid crystal display panel.
  • an energetic situation is caused by providing a hole in the light guide plate. Therefore, a problem caused by this situation will be described with reference to a partial cross-sectional view of the backlight unit 171 shown in FIG.
  • a reflection sheet 104 that guides light from the cathode ray tube 101 to the light guide plate 103 without leakage is provided on one surface (back surface) of the light guide plate 103.
  • a liquid crystal display panel 172 is provided on the other surface (surface) of 103.
  • the light guide plate 103 is provided with an opening 100H for making the reel 100R visible. Therefore, when light incident on the outer peripheral end 103G of the light guide plate 103 from the cathode ray tube 101 travels toward the opening 100H, light leaks from the peripheral end 103K of the opening 100H toward the outside. (Note that the white arrow indicates light).
  • the amount of light reaching the vicinity of the opening 100H in the light guide plate 103 can be suppressed by silk printing or the like applied to the back surface of the light guide plate 103.
  • the amount of light guided to the vicinity of the outer peripheral end 103G of the light guide plate 103 is increased in order to suppress the amount of light reaching the vicinity of the opening 100H.
  • a difference in luminance (brightness unevenness) occurs between the vicinity of the opening 100H and the vicinity of the outer peripheral end 103G in the light guide plate 103.
  • the conventional measures can not only prevent the decrease in brightness, but also cause the problem of uneven brightness.
  • the present invention has been made to solve the above problems.
  • the purpose of the present invention is to provide a backlight unit that leads to a liquid crystal display panel without losing light from the light source, and to provide a liquid crystal display device including a powerful backlight unit and a gaming device including the liquid crystal display device. It is to provide.
  • the present invention is a backlight unit including a light guide plate that propagates light supplied from a light source inside and propagates the light to the surface side.
  • a backlight unit On one surface of such a backlight unit, there are a visual recognition area for visually recognizing the tip of the backlight unit from the front side to the back side, and a light emission area for emitting backlight light.
  • a part of the light guide plate located at the boundary between the visual recognition area and the light output area is defined as a boundary part, at least a part of the boundary part is propagated in the light guide plate. The amount of light that prevents light from leaking into the visible area.
  • a viewing area and a light emitting area exist on one surface of the backlight unit, light may travel from the light emitting area to the viewing area. This can be said that light (propagating light) in the light guide plate that overlaps the light emitting area leaks to the viewing area. Therefore, it is preferable that a light amount leakage prevention process for preventing light leakage is performed on a boundary portion that is a part of the light guide plate located at the boundary between the visual recognition region and the light emission region, which is a portion where light leaks. This is because the progress of light from the light emission area to the visual recognition area can be suppressed.
  • the light leakage prevention process is A reflection process that reflects the propagating light traveling toward the region and returns it to the light emitting region may be included.
  • the light quantity leakage prevention process includes a thickness adjustment process in which the thickness of the light guide plate on the boundary side is made thinner than the thickness of the light guide plate on the light receiving unit side, which is a part of the light guide plate that receives light from the light source. Also good.
  • the light leakage prevention process may include both the thickness adjustment process and the reflection process described above!
  • the reflection process may include providing a reflecting material that reflects propagating light traveling toward the viewing area and returns it to the light emission area at least at the boundary part. (1) ⁇ .
  • the reflection treatment is a part of the reflection sheet that faces the back surface of the light guide plate and reflects the propagation light to guide the reflected light to the surface side of the light guide plate, and at least a part of the boundary portion.
  • the reflection processing may be performed on at least a part of the boundary portion by performing reflection printing that reflects the propagating light traveling toward the viewing region and returns it to the light emitting region. Processing (3) ⁇ .
  • the reflection printing ⁇ reflection treatment (3) ⁇ and a reflecting material that reflects the propagating light traveling toward the viewing area and returns it to the light emitting area are provided on at least a part of the boundary portion. It is also possible to carry out a reflection process including both the above and the ⁇ reflection process (4) ⁇ .
  • Reflection treatment including both covering at least a part of the boundary may be used ⁇ reflection treatment (5) ⁇ .
  • the reflection process as described above can change the traveling direction of light by refraction (reflection). For this reason, the progress of light from the light emitting area to the viewing area can be suppressed relatively easily, and light quantity leakage can be prevented.
  • the boundary portion side of the back surface of the light guide plate is inclined so as to approach the surface of the light guide plate, and the area of the boundary portion is made smaller than the area of the light receiving portion.
  • the light amount leakage prevention process may be a process including both a reflection process and a thickness adjustment process. Then, a combination of the thickness adjustment process and each of the above five reflection processes ⁇ (1) to (5) ⁇ is included! / Even if it ’s dark, we can prevent light leakage! / Barking. Thus, when the reflection treatment and the thickness adjustment treatment are used in combination, the effect of preventing light leakage is increased, which is desirable.
  • the backlight unit faces the back surface of the light guide plate and reflects the propagation light. It is desirable that a reflection sheet for guiding the incident light to the surface side of the light guide plate is provided.
  • the back surface of the light guide plate may be subjected to a back surface reflection process for propagating propagating light toward the front surface side of the light guide plate.
  • At least a part of the boundary portion subjected to the light amount leakage prevention process is a portion facing the light source. This is because the portion where light is most likely to leak is the portion facing the light source at the boundary. Therefore, light leakage can be effectively prevented if light leakage prevention processing is applied to the part that is tough.
  • backlight units of the present invention including a viewing area and a light emitting area.
  • a backlight unit in which the viewing area is an opening provided in the light guide plate and the boundary portion is the peripheral edge of the opening, or the side end portion of at least two light guide plates facing each other is facing the viewing area.
  • a backlight unit that is a gap generated in some cases, and whose boundary portion is a side end portion of the light guide plate facing the gap.
  • a liquid crystal display device having a liquid crystal display panel that receives backlight light from the backlight unit as described above is also the present invention, and further, from the viewing region included in the liquid crystal display device,
  • the present invention is also a gaming device that shows a variable display section for variably displaying.
  • the visual recognition area and the light emission area exist on one surface of the backlight unit.
  • light leakage prevention processing is performed at the boundary between the two areas. And this light quantity leakage prevention process has suppressed the leakage of the propagation light in the light guide plate to the visual recognition area. Therefore, the light use efficiency in the knocklight unit is increased. That is, the backlight unit of the present invention can propagate the light from the light source in the light emitting region without leaking the viewing region force and convert it into knock light.
  • FIG. 1 is a partial cross-sectional perspective view of a liquid crystal display device including a backlight unit.
  • FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG.
  • FIG. 3 is an overall perspective view of a liquid crystal display device including a knock light unit.
  • FIG. 4 is a partial cross-sectional perspective view showing another example of FIG. 1.
  • FIG. 5 is a partial cross-sectional perspective view of a liquid crystal display device including a backlight unit that has been subjected to light quantity leakage prevention processing using a reflective sheet.
  • FIG. 6A is a cross-sectional view taken along line BB ′ of FIG.
  • FIG. 6B is a cross-sectional view showing another example in which the end of the reflection sheet shown in FIG. 6A is extended.
  • FIG. 6C is a cross-sectional view showing another example in which the angle of the reflection sheet covering the peripheral edge of the hole shown in FIG. 6A is changed.
  • FIG. 6D is a cross-sectional view showing another example in which the end of the reflection sheet shown in FIG. 6C is extended.
  • FIG. 7 is a partial cross-sectional perspective view of a liquid crystal display device including a backlight unit that has been subjected to light amount leakage prevention processing for adjusting the thickness of the light guide plate.
  • FIG. 8 is a partial cross-sectional perspective view showing another example of FIG.
  • FIG. 9 is a front view of the slot machine.
  • FIG. 10 is a partial cross-sectional view of a liquid crystal display device included in a conventional slot machine. Explanation of symbols
  • a slot machine 89 shown in FIG. 9 includes a liquid crystal display device 79 that displays information required for a game and reels R (R1′R2′R3) in which various symbols are arranged in a line.
  • FIG. 9 is a partial perspective view of FIG. 9, FIG. 1 is a partial cross-sectional perspective view of FIG. 3, and FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. And (For convenience, the liquid crystal display panel 72 described later is omitted in FIGS. 1 and 3.
  • FIG. 3 mainly shows the light guide plate 3).
  • the liquid crystal display device 79 functions as a display panel by receiving a knock light unit (side light type backlight unit) 71 and knock light (planar light) from the knock light unit 71. It has a liquid crystal display panel 72 and a casing 73 for mounting them.
  • the knock light unit 71 includes a cathode ray tube (light source) 1, a reflector 2, a light guide plate 3, a reflection sheet 4, an optical sheet 5, and a frame (back frame) 6 that supports them.
  • a cathode ray tube (lamp) 1 emits light, and part of the light is the outer peripheral end 3 of the light guide plate 3.
  • the cathode ray tube 1 is an example, and the light source may be an LED (Light Emitting Diode).
  • the reflector 2 guides the remaining light, which is directly incident on the outer peripheral end 3G of the light guide plate 3, to the outer peripheral end 3G of the light guide plate 3 by reflecting the remaining light.
  • the light guide plate 3 propagates light (linear light) incident on the outer peripheral edge 3G inside to make one surface (light guide plate
  • the light is emitted from the light emitting surface of the light guide plate 3.
  • the reflection sheet 4 reflects the light incident on the outer peripheral end 3G of the light guide plate 3 and the light propagating through the light guide plate 3 (propagating light) toward the liquid crystal display panel 72 without leaking. is there
  • the reflective function may be exhibited by applying a texture or silk printing on the back surface of the light guide plate 3 (referred to as “back surface reflection treatment”), or the reflection sheet 4 and the back surface reflection treatment may be used in combination.
  • the optical sheet 5 diffuses light from the light guide plate 3 and spreads light over the entire liquid crystal display panel 72.
  • the light guide plate 3, the reflection sheet 4, the optical sheet 5, and the frame 6 are provided with openings 3 ⁇ , 4 ⁇ , 5 ⁇ , and 6 ⁇ , respectively. Openings 3 ⁇ , 4 ⁇ ⁇ , 5 ⁇ , and 6 ⁇ overlap to form one open hole (see Fig. 2). And this opening 11 (311'411'511'611) fulfills the function (viewing function) for visually recognizing the reel R located on the back of the knocklight unit 71! /
  • the tip of the knock light unit 71 from the front side to the back side is viewed.
  • (Good) has a “light leakage prevention process” that prevents the propagation of light from leaking into the aperture 3H. Therefore, examples of such light quantity leakage prevention processing will be listed and described below.
  • the light amount leakage prevention process it is possible to provide a reflective material 11 on at least a part of the peripheral end 3K of the opening 3H in the light guide plate 3 (reflecting the process using such a reflection function). Called processing). For example, as shown in FIG. 1, it is desirable that the reflecting material 11 is provided on all of the peripheral end portions 3K of the openings 3H in the light guide plate 3.
  • the light propagating through the light guide plate 3, especially the outer peripheral end (light receiving portion) 3G of the light guide plate 3 proceeds toward the opening 3H.
  • Light force is reflected by the reflective material 11 so as to return to the inside of the light guide plate 3. For this reason, light does not leak to the outside through the opening 3H of the light guide plate 3 (a white arrow indicates light).
  • the luminance distribution from the outer peripheral end 3G to the opening 3H in the light guide plate 3 becomes uniform. That is, the luminance of a part of the light guide plate 3 facing the cathode ray tube 1 (luminance near the outer peripheral edge 3G) and the luminance of a part of the light guide plate 3 facing the aperture 3H (luminance near the peripheral edge 3K) , No difference occurs. As a result, the quality of the liquid crystal display panel 72 that displays images by receiving light (backlight light) from the light guide plate 3 is enhanced.
  • the number of cathode-ray tubes 1 required to secure a constant amount of light to the liquid crystal display panel 72 is relatively small. It may be less. Therefore, the number of cathode ray tubes 1 can be reduced, and the knock light unit 71 can be made inexpensive. In addition, the power consumption of the knock light unit 71 is reduced due to the relatively small number of cathode ray tubes 1.
  • the reflector 11 may be provided only on the peripheral end portion 3 mm of the opening 3 mm facing the cathode ray tube 1 (3 mm). .
  • the reflecting material 11 is not particularly limited as long as it is a material that reflects the light propagating (traveling) in the light guide plate 3 toward the opening 3 ⁇ . Therefore, the reflecting material 11 may be a metal! /, Or a resin ⁇ PET (poly (ethylene terephthalate)) ⁇ . Moreover, the method of attaching the reflecting material 11 is not particularly limited. Therefore, the attachment method may be affixing with an adhesive or double-sided tape, or may be fixed by fitting into the opening 3H.
  • the reflection sheet 4 located on the back surface side of the light guide plate 3 reflects light propagating through the light guide plate 3 and guides the light to the surface side of the light guide plate 3. Therefore, such a reflection function should be used, and as shown in FIG. 5, at least a part of the peripheral end 3K of the opening 3H may be covered with a part of the reflection sheet 4 (using such a reflection function).
  • the treatment is referred to as reflection treatment, although a part of the reflection sheet 4 may cover the entire peripheral edge 3K of the opening 3H.
  • the reflection sheet 4 provided normally prevents light leaking from the aperture 3H of the light guide plate 3. Therefore, a separate member for reflection processing (for example, the reflecting material 11) becomes unnecessary. Therefore, the cost of the knock light unit 71 and the liquid crystal display device 79 can be reduced. In addition, since light leaking from the aperture 3H of the light guide plate 3 is suppressed, the above-described effects of improving the quality of the liquid crystal display panel 72 and reducing the power consumption of the backlight unit 71 are achieved. No way! /.
  • FIG. 6A which is a cross-sectional view taken along the line BB ′ in FIG. 5, one surface of the reflection sheet 4 facing the peripheral end 3K of the opening 3H in the light guide plate 3 is the peripheral end. Even if it is inclined with respect to 3K, it covers a part of the peripheral edge 3K (more specifically, a part of the light guide plate 3 in the thickness direction on the surface of the peripheral edge 3K). Prevents light leaking from.
  • FIG. 6B the surface of the reflection sheet 4 facing the peripheral end portion 3K of the opening 3H is inclined with respect to the peripheral end portion 3K, as shown in FIG. 6B. All (in detail, on the surface of the peripheral edge 3K All of the light guide plate 3 in the thickness direction) is covered! /!
  • one surface of the reflection sheet 4 facing the peripheral end 3K of the opening 3H is parallel to the peripheral end 3K, and the light guide plate on the surface of the peripheral end 3K. 3 may be covered so as to cover a part in the thickness direction.
  • a part of the reflective sheet 4 facing the peripheral end 3K of the opening 3H is parallel to the peripheral end 3K, and the light guide plate 3 on the surface of the peripheral end 3K It's okay to cover everything in the thickness direction.
  • silk printing may be applied to a part of the peripheral edge 3K of the opening 3H in the light guide plate 3 (a process using such a reflection function is referred to as a reflection process.
  • the hole 3H may be applied to all of the peripheral end 3K.
  • the aperture 3H force is required. It is more desirable because the leaked light can be reliably suppressed.
  • the thickness of the light guide plate 3 on the peripheral end 3K side is made thinner than the thickness of the light guide plate 3 on the peripheral end 3G side, for example, the boundary portion side of the back surface of the light guide plate 3 3 (in detail, the back surface of the light guide plate 3 on the peripheral edge 3K side approaches the liquid crystal display panel 72, while the back surface of the light guide plate 3 on the peripheral edge 3G side is separated from the liquid crystal display panel 72. To tilt).
  • the area of the peripheral end 3K is smaller than the area of the outer peripheral end 3L.
  • the inner surface of the back surface of the light guide plate 3 is inclined so that it faces the cathode ray tube 1.
  • Light traveling from the cathode ray tube 1 is incident on the back surface of the light guide plate 3.
  • the light guide It becomes easy to reflect toward the surface of the plate 3, and it proceeds to the opening 3H.
  • the thickness of the peripheral end portion 3K is reduced, the area of the peripheral end portion 3K that is in contact with (connected to) the opening 3H becomes relatively small. For this reason, light leaks through the peripheral edge 3K due to the powerful narrow area.
  • a reflective material 11 is provided on the peripheral end 3K (peripheral end 3K having a small area) composed of such a relatively thin light guide plate 3 (of course, it may be covered with the reflective sheet 4). Or if silk printing is applied, the light leaking from the aperture 3H force of the light guide plate 3 can be prevented more reliably. Further, silk printing and installation of the reflective material 11 (or covering of the reflective sheet 4) may be performed on the peripheral edge 3K.
  • the force is such that only the back surface of the light guide plate 3 is inclined. In short, it is only necessary to be able to guide more propagation light to the surface of the light guide plate 3 from the outer peripheral end 3G of the light guide plate 3 to the peripheral end 3K of the opening 3H. Also, if the back of the light guide plate 3 is silk-printed or if there is a reflective sheet 4 on the back side of the light guide plate 3, the propagation light is effectively reflected and guided to the surface of the light guide plate 3. Needless to say
  • the backlight unit 71 including the light guide plate 3 having the opening 3H has been described as an example. However, it is not limited to this.
  • it may be a backlight unit 71 in which the two light guide plates 3 and 3 are separated from each other with the reel portion R as a boundary.
  • the reel portion R is visible from the gap P (viewing region P) generated when the side end portions g3'g3 of the two light guide plates 3 ⁇ 3 face each other. Is done. That Therefore, the propagating light propagating through the inside of the light guide plate 3 is likely to leak from the side end portions g3′g3 of the light guide plates 3 ⁇ 3 facing (contacting) the gap P. Therefore, the light leakage prevention process described above is preferably applied to the side end g3′g3 (which may be referred to as the side end surface g3′g3) of the light guide plates 3 ⁇ 3 facing the gap P.
  • FIG. 8 shows a light amount leakage prevention process including thickness adjustment, that is, the side end portions (boundary portions) g3′g3 of the light guide plates 3 and 3 facing the gap P are different from those of the cathode ray tube 1. It shows a state in which the thickness is smaller than the thickness at the outer peripheral end G′G of the light guide plate 3 that receives the light. In other words, the area of the side end portion 8 3 3 of the light guide plate 3 ′ 3 facing the gap P is smaller than the area of the outer peripheral edge G ⁇ G of the light guide plate 3 that receives light from the cathode ray tube 1, Indicate the status.
  • the above light amount leakage prevention process may be applied to the side end portions g3 and g3 of the light guide plate facing the gap P.
  • Light leakage prevention processing including reflection processing using silk printing and reflective material (4) • Light leakage prevention processing including reflection processing using silk printing and reflection sheet (5) • Light intensity including light guide plate thickness adjustment processing Leak prevention treatment (see Fig. 8)
  • the reflector 11 shown in FIGS. 1, 2, and 4 covers the entire thickness direction of the light guide plate 3 on the surface of the peripheral end 3K in the opening 3H.
  • the present invention is not limited to this.
  • a part of the light guide plate 3 in the thickness direction may be covered on the surface of the peripheral end 3K in the opening 3H.
  • the light amount leakage prevention process only needs to suppress the amount of light leaking from the peripheral end 3K in the opening 3H. Therefore, for example, light is emitted to several sides of the peripheral edge 3K of the four sides in the opening 3H.
  • a quantity leakage prevention process may be performed! /, Or a part of the light guide plate 3 in the thickness direction on the surface of the peripheral edge 3K may be subjected to a light quantity leakage prevention process (i.e., open).
  • Light leakage prevention treatment should be applied to at least a part of the peripheral edge 3K of the hole 3H! /,).
  • the knock light unit 71 in which the gap P is generated in order to separate the two light guide plates 3 and 3 from each other the same applies to the knock light unit 71 in which the gap P is generated in order to separate the two light guide plates 3 and 3 from each other.
  • the light amount leakage prevention process only needs to suppress the amount of light leaking from the side end g3′g3 of the light guide plate 3 facing the gap P.
  • only one of the side end portions g3′g3 of the light guide plates 3 and 3 facing the gap P may be subjected to light leakage prevention processing.
  • the light guide plates 3 and 3 facing the gap P may be used.
  • the side edge of g3 'g3' may have a light leakage prevention treatment in part in the thickness direction (ie, the side edge g3'g3 of light guide plate 3 ⁇ 3 facing gap P) It is sufficient that at least part of the light leakage prevention process is applied).
  • the thickness of the two end portions (the side end portions of the light guide plates 3 and 3 facing the gap P g3 ′ and the thickness of the light guide plate 3 on the g3 side and the outer end 3G ′ on the 3G side
  • the light guide plate 3 having a different thickness may be referred to as a “wedge-shaped light guide plate”, as shown in FIG. 7.
  • the light guide plates 3 having different thicknesses may be referred to as “light guide plates including a wedge shape”.
  • the optical sheet 5 positioned on the light guide plate 3 has an opening 5 H (see FIG. 2) corresponding to the opening 3H of the light guide plate 3, and side edges of the two light guide plates 3 and 3.
  • a gap 5P (see FIG. 8) corresponding to the gap P generated when g3′g3 is separated from each other is not always necessary.
  • a part of the optical sheet 5, that is, a part of the optical sheet 5 that overlaps the opening 3 ⁇ / b> H or the gap P of the light guide plate 3 may be transparent (transparent part; viewing region). This is because the reel portion R is visually recognized through the transparent portion (transmission region) in the optical sheet 5 if this is the case.
  • the frame 6 itself may be made of a material having a reflection function (such as resin or metal), and the frame 6 may overlap the back surface of the light guide plate 3. This is because the reflection sheet 4 can be omitted if there is such a frame (reflection frame) 6 (however, the reflection sheet 4 and the reflection frame 6 may be used in combination).
  • a method similar to the light leakage prevention process in which the reflective sheet 4 is used may be applied to the reflective frame 6.
  • a part of the reflection frame 6 located on the back surface side of the light guide plate 3 may cover at least a part of the peripheral end portion 3K of the opening 3H of the light guide plate 3 ⁇ this is a reflection process (6) ⁇ .
  • a part of the reflection sheet 4 and a part of the reflection frame 6 may cover at least a part of the peripheral end 3K of the opening 3H (referred to as reflection treatment (7)).
  • the light leakage prevention process [referred to as reflection process (8) ⁇ (9)] using the reflection process (6) or (7) and silk printing may be performed! /. Further, a light quantity leakage prevention process using both of the reflection processes (6) to (9) and adjusting the thickness of the light guide plate may be performed. Note that the light leakage prevention process of the combined type including the adjustment of the thickness of the light guide plate as described above and the light leakage prevention process using the reflection processes (6) to (9) are as shown in FIG. Needless to say, the present invention can be applied to the backlight unit 71 including the light guide plates 3 and 3.
  • the reflector 2 extends so that a part of the reflector 2 overlaps the back surface of the light guide plate 3, and on the part of the surface of the reflector 2, a resin having a reflective function (silver or the like) is deposited. You can be! / ⁇ (however, vapor deposition is performed on the surface of the reflector 2 that overlaps the back surface of the light guide plate 3 and the surface closest to the powerful back surface).
  • the reflector 2 itself may be made of a material having a reflection function (eg, resin, metal, etc.), and the reflector 2 may overlap the back surface of the light guide plate 3. This is because, if such a reflector 2 is provided, it is possible to omit the reflection sheet 4 as in the case of the reflection frame 6 (however, the reflection sheet 4 and the reflector 2 may be used in combination).
  • a method similar to the light amount leakage prevention process in which the reflection sheet 4 is used may be applied to the reflector 2. That is, a part of the reflector 2 located on the back surface side of the light guide plate 3 may cover at least a part of the peripheral end 3K of the opening 3H of the light guide plate 3 with the reflection treatment (10). ⁇ . Further, a part of the reflection sheet 4 and a part of the reflector 2 may cover at least a part of the peripheral end 3K of the opening 3H ⁇ referred to as reflection treatment (11)]
  • the backlight unit 71 shown in the figure is a cathode ray tube in which two power places (two sides of the outer peripheral end 3G of the quadrangular light guide plate 3 having four sides) out of the outer peripheral end 3G of the light guide plate 3 are used. Irradiated with 1 light. However, it is not limited to this.
  • each of the outer peripheral ends 3G of the light guide plate 3 may be irradiated with light from the cathode ray tube 1. That is, a set of four cathode ray tubes 1 (two cathode ray tubes 1 and 1 as one set) may be arranged on four sides of the light guide plate 3 respectively.
  • the propagating light easily reaches all the peripheral edge portions 3K in the opening 3H. For this reason, it is desirable that all the peripheral end portions 3K in the opening 3H be subjected to light leakage prevention processing!

Abstract

Selon cette invention, une surface (E) d'émission d'éclairage dans une unité rétroéclairée (71) est pourvue d'une ouverture (H) par laquelle il est possible de voir la face arrière de l'unité rétroéclairée (71) depuis la face avant, et d'une partie (F), excluant le trou (H), pour émettre l'éclairage, ce qui permet d'effectuer un traitement de prévention contre les fuites de lumière pour empêcher la lumière de propagation de fuir vers une surface à observer par rapport à une limite entre l'ouverture (H) et une plaque (3) de guide de lumière, à savoir, vers une partie périphérique (3K) d'une ouverture (3H) se trouvant sur la plaque (3) du guide de lumière.
PCT/JP2007/058718 2006-09-14 2007-04-23 Unité rétroéclairée, dispositif d'affichage à cristaux liquides et dispositif de jeu WO2008032464A1 (fr)

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JP2006249921 2006-09-14

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009128519A (ja) * 2007-11-21 2009-06-11 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置
JP2010026022A (ja) * 2008-07-16 2010-02-04 Stanley Electric Co Ltd 液晶表示装置
JP2017018631A (ja) * 2016-09-14 2017-01-26 株式会社ユニバーサルエンターテインメント 遊技機
JP2019122805A (ja) * 2019-03-26 2019-07-25 株式会社ユニバーサルエンターテインメント 遊技機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04245289A (ja) * 1991-01-30 1992-09-01 Aperu:Kk 面照明装置
JPH0815528A (ja) * 1994-06-29 1996-01-19 Kyocera Corp 面光源素子及び液晶表示装置
JP2001093317A (ja) * 1999-09-21 2001-04-06 Sanyo Electric Co Ltd バックライト装置
WO2004027312A1 (fr) * 2002-09-18 2004-04-01 Matsushita Electric Industrial Co., Ltd. Unite d'eclairage et ecran a cristaux liquides dans lequel elle est integree
JP2006047931A (ja) * 2004-08-09 2006-02-16 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04245289A (ja) * 1991-01-30 1992-09-01 Aperu:Kk 面照明装置
JPH0815528A (ja) * 1994-06-29 1996-01-19 Kyocera Corp 面光源素子及び液晶表示装置
JP2001093317A (ja) * 1999-09-21 2001-04-06 Sanyo Electric Co Ltd バックライト装置
WO2004027312A1 (fr) * 2002-09-18 2004-04-01 Matsushita Electric Industrial Co., Ltd. Unite d'eclairage et ecran a cristaux liquides dans lequel elle est integree
JP2006047931A (ja) * 2004-08-09 2006-02-16 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009128519A (ja) * 2007-11-21 2009-06-11 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置
JP2010026022A (ja) * 2008-07-16 2010-02-04 Stanley Electric Co Ltd 液晶表示装置
JP2017018631A (ja) * 2016-09-14 2017-01-26 株式会社ユニバーサルエンターテインメント 遊技機
JP2019122805A (ja) * 2019-03-26 2019-07-25 株式会社ユニバーサルエンターテインメント 遊技機

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