TW201305672A - Liquid crystal device, electronic apparatus and lighting device - Google Patents

Liquid crystal device, electronic apparatus and lighting device Download PDF

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Publication number
TW201305672A
TW201305672A TW101122878A TW101122878A TW201305672A TW 201305672 A TW201305672 A TW 201305672A TW 101122878 A TW101122878 A TW 101122878A TW 101122878 A TW101122878 A TW 101122878A TW 201305672 A TW201305672 A TW 201305672A
Authority
TW
Taiwan
Prior art keywords
light
guide plate
light guide
liquid crystal
illumination
Prior art date
Application number
TW101122878A
Other languages
Chinese (zh)
Other versions
TWI560496B (en
Inventor
Yoichi Momose
Original Assignee
Seiko Epson Corp
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Filing date
Publication date
Priority to JP2011147092 priority Critical
Priority to JP2011253715A priority patent/JP5821562B2/en
Priority to JP2011253714A priority patent/JP5867003B2/en
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of TW201305672A publication Critical patent/TW201305672A/en
Application granted granted Critical
Publication of TWI560496B publication Critical patent/TWI560496B/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075Arrangements of multiple light guides
    • G02B6/0078Side-by-side arrangements, e.g. for large area displays
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0058Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides 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
    • G02B6/0068Arrangements of plural sources, e.g. multi-colour light sources
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side

Abstract

The present invention provides a liquid crystal device, an electronic device, and an illumination device. When a plurality of light guide plate portions extending in the first direction are arranged side by side in the second direction, the number of the light guide plate portions or the light-emitting elements is small. Further, even if the size of the first direction is small, the emission intensity of the illumination light can be made uniform. When the area is dimmed in the liquid crystal device 100, the light guide plate portion 81 having a trapezoidal shape having a different length on both sides in the Y-axis direction is formed on the Y-axis of the light guide plate 80 of the illumination device 8. The directions of the directions are opposite and arranged in the X-axis direction. The light-emitting element 89 causes the light source light to enter the light guide plate portion 81 from the end surface of the light guide plate portion 81 on the side of the short side 812. A light scattering surface 821 is provided between the light guide plate portions 81.

Description

Liquid crystal device, electronic device and lighting device
The present invention relates to a liquid crystal device including a lighting device and a liquid crystal panel, an electronic device including the liquid crystal device, and the lighting device.
A liquid crystal device including a transmissive or semi-transmissive liquid crystal panel in various liquid crystal devices includes: an illumination device called a so-called backlight device; and a liquid crystal panel superposed on the light exit surface side of the illumination device; and a liquid crystal panel The illumination light emitted from the illumination device is modulated to display an image. Therefore, in the illumination device, it is necessary to make the emission intensity distribution of the illumination light uniform.
Therefore, in an illumination device in which a light-emitting element is provided at an end portion of a light guide plate, a plurality of light-emitting elements are disposed on opposite sides of the first direction of the light guide plate, and light-emitting elements disposed along one side are provided. The position is shifted from the position of the light-emitting element disposed along the other side in the second direction (see Patent Document 1).
Further, when the emission intensity of the illumination light from the illumination device is controlled for each region, if the light guide plate is integrated, the light is excessively diffused, and the following configuration is proposed, that is, as shown in FIG. 10(a), for example, along the first The rectangular light guide plate portion 81X extending in the direction is arranged in parallel in the second direction which is the short side direction, and the light emitting element 89 is disposed at the end portion (light incident portion 88X) of the first direction of the light guide plate portion 81X ( Refer to Patent Document 2).
On the other hand, there has been proposed an illumination device in which, instead of controlling the emission intensity of the illumination light for each region as shown in FIG. 10(b), the direction of the first direction is reversed in the first direction. The length of the two sides is not the same The plurality of light guide plate portions 82Y having the trapezoidal shape are arranged in the second direction, and the light-emitting element 89 is disposed on the end surface (light incident portion 88Y) of the light guide plate portion 82Y on the long side (see Patent Document 3).
[Previous Technical Literature] [Patent Literature]
[Patent Document 1] Japanese Patent Laid-Open Publication No. 2006-120361
[Patent Document 2] Japanese Patent Laid-Open Publication No. 2009-163902
[Patent Document 3] Japanese Patent Laid-Open Publication No. 2006-108045
However, in the case of the illumination device described in Patent Document 2, the size of the light incident portion 88X of the light guide plate portion 81X in the second direction is larger than the size of the light-emitting element 89 in the second direction. Therefore, when the illumination light is emitted from the light guide plate portion 81X, there is a problem that the intensity of the illumination light from the portion opposite to the light-emitting element 89 is large in the vicinity of the light incident portion 88X of the light guide plate portion 81X. When the region is shifted in the second direction, the emission intensity of the illumination light is apt to decrease. In the case of the configuration described in Patent Document 3, the size of the light incident portion 88Y of the light guide plate portion 82Y in the second direction and the light emitting element 89 in the second direction are higher than those of the illumination device described in Patent Document 2. The size is relatively large, so the above problems are significant.
Therefore, when the configurations described in Patent Documents 2 and 3 are employed, it is necessary to reduce the size of the light guide plate portions 81X and 82Y in the second direction, and to increase the number of the light guide plate portions 81X and 82Y and the light-emitting elements 89. The size of the light plate portions 81X and 82Y in the second direction is close to the size of the light-emitting element 89 in the second direction, but In the case of this configuration, the cost of the illumination device or the liquid crystal device increases. Further, in the configurations described in Patent Documents 2 and 3, it is also considered that the light-emitting elements 89 are provided at positions far from the light incident portions 88X and 88Y of the light guide plate portions 81X and 82Y, and the light of the light guide plate portions 81X and 82Y is reduced. The emission intensity of the illumination light in the vicinity of the incident portions 88X and 88Y is inferior. However, in the case of this configuration, there is a problem that the size of the illumination device increases in the first direction and cannot be mounted on the liquid crystal device.
In view of the above problems, an object of the present invention is to provide a light guide plate portion or a light-emitting element which is relatively small even when a plurality of light guide plate portions extending in the first direction are arranged side by side in the second direction. A liquid crystal device having a relatively small size in the first direction and achieving uniformization of the emission intensity of the illumination light, an electronic device including the liquid crystal device, and the illumination device.
In order to solve the above problems, a liquid crystal device according to the present invention includes an illumination device and a liquid crystal panel that is disposed on a side of a light exit surface of the illumination device, wherein the illumination device includes a light guide plate including a plurality of guides in a planar shape. In the light plate portion, each of the plurality of light guide plate portions has a first side and a second side opposite to each other in the first direction, and the length of the second side is longer than the length of the first side, and the light is emitted The second direction orthogonal to the first direction in the in-plane direction of the surface is arranged such that the first side of the first light guide plate portion and the second side of the second light guide plate portion are adjacent to each other; And at least one of the light-emitting elements, wherein each of the plurality of light guide plate portions is disposed such that the light-emitting surface faces the first side.
In the liquid crystal device of the present invention, when the emission intensity of the illumination light from the illumination device is controlled for each region in conjunction with the driving of the liquid crystal panel, the direction of the first direction is opposite to the first direction. The light guide plate portion having a planar shape having different lengths on both sides is arranged in the second direction, and the light source light emitted from the light-emitting element enters the light guide plate portion from the end surface of the light guide plate portion located in the first direction. Therefore, unlike the case of using an integrated light guide plate, excessive light diffusion of the light source can be suppressed, so that the emission intensity of the illumination light can be preferably controlled for each area. Here, the light-emitting element causes the light source light to enter the light guide plate portion from the end surface of the first side (short side) of the two opposite sides of the light guide plate portion located in the first direction. Therefore, it is possible to prevent the size of the end surface (light incident portion) where the light source light is incident on the light guide plate portion from being excessively larger than the size of the light-emitting element in the second direction. Therefore, even if the light-emitting element is not excessively separated from the light incident portion of the light guide plate portion in the first direction, the portion of the light guide plate portion that faces the light-emitting element and the light source that is offset from the region in the second direction The difference in the amount of incident light is also small. Therefore, when the illumination light is emitted from the light guide plate portion, the emission intensity of the illumination light from the portion facing the light-emitting element and the position shifted from the region toward the second direction are emitted in the vicinity of the light incident portion of the light guide plate portion. The difference in the exit intensity of the illumination light is small. Therefore, even when a plurality of light guide plate portions extending in the first direction are arranged side by side in the second direction, the number of the light guide plate portions or the light-emitting elements is relatively small, and even if the size of the first direction is relatively large, Small, it is also possible to achieve uniformity of the emission intensity of the illumination light.
In the present invention, the light guide plate portion may have a trapezoidal planar shape in which the first side and the second side are parallel. According to this structure Since the light-emitting elements are arranged linearly in the second direction on both sides in the first direction of the light guide plate, the structure in which the substrate on which the light-emitting elements are mounted is linearly extended can be simplified.
In the present invention, the light guide plate portion may have a configuration in which a beveled edge extends in the first direction to connect one end of the first side and one end of the second side, and a side edge thereof The other end of the first side and the other end of the second side are connected to each other so as to extend orthogonally to the first side and the second side. According to this configuration, the light guide plate is formed in a rectangular shape so that the light guide plate portion is disposed such that the side orthogonal to the parallel sides is disposed on the outer side in the second direction.
In the invention, it is preferable that a light-scattering surface is provided between adjacent ones of the plurality of light-guiding plate portions. According to this configuration, since a part of the light leaks from the light guide plate portion toward the adjacent light guide plate portion via the light scattering portion, it is possible to prevent the emission intensity of the illumination light from rapidly changing at the boundary portion between the adjacent light guide plate portions.
In the present invention, the light-scattering surface may be provided between one of the plurality of light guide plate portions adjacent to the light guide plate portion in a thickness direction of the light guide plate portion, and Some have a reflective surface. According to this configuration, when the ratio of the light-scattering surface and the reflecting surface is adjusted, the amount of light leaking from the light guide plate portion to the adjacent light guiding plate portion and the amount of light reflected on the reflecting surface and returned to the light guiding plate portion can be adjusted. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing at the boundary portion between the adjacent light guide plate portions, and it is possible to optimize the amount of illumination light emitted from the light guide plate portion.
In the present invention, the following configuration may also be adopted, that is, in a plurality of the above guides Between the adjacent light guide plate portions in the light plate portion, the light scattering surface is provided in one of the thickness directions of the light guide plate portion, and a gap is provided in the other portion. According to this configuration, reflection occurs at the interface between the end surface of the light guide plate portion and the air layer in the gap, and a part of the light is incident on the adjacent light guide plate portion via the gap. Therefore, if the ratio of the light-scattering surface and the gap is adjusted, the amount of light leaking from the light guide plate portion to the adjacent light guide plate portion and the interface between the end surface of the light guide plate portion and the air layer in the gap can be adjusted and returned to The amount of light in the light guide plate portion. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing at the boundary portion between the adjacent light guide plate portions, and it is possible to optimize the amount of illumination light emitted from the light guide plate portion.
In the present invention, a configuration may be adopted in which a gap is provided between adjacent light guide plate portions of the plurality of light guide plate portions. According to this configuration, reflection occurs at the interface between the end surface of the light guide plate portion and the air layer in the gap, and a part of the light is incident on the adjacent light guide plate portion via the gap. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing at the boundary portion between the adjacent light guide plate portions, and it is possible to optimize the amount of illumination light emitted from the light guide plate portion.
In the present invention, the thickness of the plurality of light guide plate portions may be continuously changed in the first direction.
In this case, it is preferable that the thickness of the plurality of light guide plate portions increases from the second side toward the first side. According to this configuration, since the incident light source light easily reaches the front end side of the light guide plate portion with a sufficient amount of light, the emission intensity of the illumination light emitted from the light guide plate portion can be made uniform.
In the present invention, preferably, the plurality of light guide plate portions are arranged such that the first side is adjacent to the second side by any one of the adjacent light guide plate portions. Column. According to this configuration, since the traveling direction of the first direction of the light source light in the light guide plate alternates in the second direction, it is difficult to cause unevenness in brightness in the light guide plate.
The liquid crystal device of the present invention can be used as a display portion in various electronic devices.
Moreover, the illumination device of the present invention includes a light guide plate including a plurality of light guide plate portions having a planar shape, and each of the plurality of light guide plate portions has a first side and a second side opposite to each other in the first direction. The length of the second side is longer than the length of the first side, and the second light guide plate portion is in the second direction orthogonal to the first direction in the in-plane direction of the light exit surface. a plurality of the first side and the second side of the second light guide plate portion are arranged adjacent to each other; and at least one light emitting element, wherein each of the plurality of light guide plate portions has a light emitting surface and the first 1 side is configured in the opposite direction.
In the illumination device according to the present invention, when the emission intensity of the illumination light is controlled for each region, the direction of the first direction is reversed, and the light guide plate portion having a planar shape having different lengths on both sides facing the first direction is different. The light source light emitted from the light-emitting element in the light guide plate portion is incident on the light guide plate portion from the end surface located in the first direction. Therefore, unlike the case of using an integrated light guide plate, excessive light diffusion of the light source can be suppressed, so that the emission intensity of the illumination light can be preferably controlled for each area. Here, the light-emitting element causes the light source light to enter the light guide plate portion from the end surface of the first side (short side) of the two opposite sides of the light guide plate portion located in the first direction. Therefore, it is possible to prevent the size of the end surface (light incident portion) where the light source light is incident on the light guide plate portion from being excessively larger than the size of the light-emitting element in the second direction. So even if not The light-emitting element is excessively separated from the light incident portion of the light guide plate portion in the first direction, and the difference between the incident light amount of the light source light at a position where the portion of the light guide plate facing the light-emitting element and the light-emitting element is offset from the region is also Smaller. Therefore, when the illumination light is emitted from the light guide plate portion, the emission intensity of the illumination light from the portion facing the light-emitting element in the vicinity of the light incident portion of the light guide plate portion and the position from the region to the second direction are offset. The difference in the exit intensity of the illumination light is small. Therefore, even when a plurality of light guide plate portions extending in the first direction are arranged side by side in the second direction, the number of the light guide plate portions or the light-emitting elements is relatively small, and even if the size of the first direction is relatively large, Small, it is also possible to achieve uniformity of the emission intensity of the illumination light.
Embodiments of the present invention will be described with reference to the drawings. In addition, in the drawings referred to in the following description, each layer or each member is set to a degree recognizable in the drawing, and therefore the scale of each layer or each member is different. In the following description, the direction in which the in-plane directions of the light guide plate or the liquid crystal panel intersect each other is defined as the X-axis direction and the Y-axis direction, and the direction intersecting the X-axis direction and the Y-axis direction is referred to as the Z-axis direction. Further, in the drawings referred to below, one side of the X-axis direction is shown as the X1 side, the other side is shown as the X2 side, and one side of the Y-axis direction is shown as the Y1 side, and the other side is shown as On the Y2 side, one side of the Z-axis direction is shown as the Z1 side (lower side), and the other side (the side from which the illumination light or the display light is emitted) is shown as the Z2 side (upper side).
[Embodiment 1] (overall)
1 is a view showing the overall configuration of a liquid crystal device according to Embodiment 1 of the present invention. 1(a) and 1(b) are a perspective view showing the appearance of a liquid crystal device and a cross-sectional view of the liquid crystal device. Fig. 2 is an exploded perspective view showing the liquid crystal device according to the first embodiment of the present invention.
In FIG. 1 and FIG. 2, the liquid crystal device 100 of the present embodiment generally includes an illumination device 8, which is referred to as a so-called backlight, and a transmissive or transflective liquid crystal panel 10, which are disposed on the illumination device 8 in an overlapping manner. surface. In the present embodiment, the liquid crystal panel 10 includes a transmissive liquid crystal panel. Further, the liquid crystal device 100 includes a resin frame 30 made of resin, which holds the liquid crystal panel 10 and the illumination device 8 inside, and a lower metal frame 40 disposed on the lower side of the resin frame 30 (the opposite side of the display surface / Z axis) One side of the direction Z1); and the upper metal frame 50 are disposed on the upper side of the resin frame 30 (the side of the display surface / the other side Z2 of the Z-axis direction). The resin frame 30 and the lower metal frame 40 are sometimes integrally formed by insert molding or injection molding.
The liquid crystal panel 10 has a quadrangular planar shape, and includes an element substrate 11 on which a pixel electrode 15 and the like are formed, a counter substrate 12 disposed opposite to the element substrate 11 with a specific gap therebetween, and a sealing material 14 The counter substrate 12 is bonded to the element substrate 11. In the liquid crystal panel 10, the liquid crystal layer 13 is held in a region surrounded by the sealing material 14. The element substrate 11 and the counter substrate 12 include a light-transmissive substrate such as a glass substrate. In the element substrate 11, a plurality of scanning lines (not shown) extend in the X-axis direction, and on the other hand, a plurality of data lines extend in the Y-axis direction and correspond to intersections of scanning lines and data lines (not shown). A switching element (not shown) and a pixel electrode 15 are provided.
In the present embodiment, the counter substrate 12 is disposed on the emission side of the display light, and the element substrate 11 is disposed on the side of the illumination device 8. The liquid crystal panel 10 is used as a TN (twist) a liquid crystal panel of a Twisted Nematic method, an ECB (Electrically Controlled Birefringence) method or a VAN (Vertical Aligned Nematic) method, in which the pixel electrode 15 is formed on the element substrate 11, and A common electrode 16 is formed on the substrate 12. In the present embodiment, the liquid crystal panel 10 has a diagonal of 3.5 inches and a pixel of 320 x 480. In the case where the liquid crystal panel 10 is an IPS (InPlane Switching) or FFS (Fringe Field Switching) liquid crystal panel, the common electrode 16 is provided on the side of the element substrate 11. Further, the element substrate 11 may be disposed on the emission side of the display light with respect to the counter substrate 12. The upper polarizing plate 18 is disposed on the upper surface of the liquid crystal panel 10, and the lower polarizing plate 17 is disposed between the lower surface of the liquid crystal panel 10 and the illumination device 8.
In the element substrate 11, a driving IC (Integrated Circuit) 140 is mounted on the upper surface of the protruding portion 110 from the edge of the opposite substrate 12, and a flexible portion is connected to the end portion of the protruding portion 110. Substrate 200. Mounted on the flexible substrate 200, a display control IC 250 that outputs image data to the liquid crystal panel 10 and a light source driving IC 280 (light source driving unit) that controls lighting of the illumination device 8.
In the present embodiment, the light source driving IC 280 controls the emission intensity of the illumination light from the illumination device 8 for each region in conjunction with the driving of the liquid crystal panel 10. More specifically, in the liquid crystal device 100 of the present embodiment, the area dimming method is adopted in which the emission intensity of the illumination light from the illumination device 8 is set in the region where the image having the higher brightness is displayed in the liquid crystal panel 10. Larger, will come from the lighting device 8 in the area where the image with lower brightness is displayed. The emission intensity of the illumination light is set to be small. This operation is performed by the light source driving IC 280 controlling the driving current to the light-emitting element 89 used in the illumination device 8 under the control of the display control IC 250.
The illuminating device 8 includes a rectangular light guide plate 80 which is disposed on the lower surface side of the liquid crystal panel 10 and a light-emitting element 89 such as a light-emitting diode that emits white light, and the light guide plate 80 includes an acrylic resin or a polycarbonate resin. Translucent resin board. The flexible substrate 200 connected to the liquid crystal panel 10 is a double-sided substrate, and the light-emitting element 89 is mounted on a strip portion 210 or the like extending over the flexible substrate 200. As described in detail below, the light guide plate 80 includes the light incident portion 88, and the light source light emitted from the light-emitting element 89 enters the light guide plate 80 from the light incident portion 88, and then travels inside the light guide plate 80 as light from the upper surface of the illumination light. The exit surface 85 is emitted. Further, in the illumination device 8, a reflection sheet 187 is placed on the lower surface of the light guide plate 80, and an optical sheet such as a diffusion plate 182 or a gusset 183 or 184 is placed on the upper surface of the light guide plate 80. In the present embodiment, the two ridges 183, 184 are arranged orthogonal to each other. Therefore, the illumination light emitted from the light exit surface 85 of the light guide plate 80 is omnidirectionally diffused by the diffusion plate 182, and is provided with the directivity of the peak in the front direction of the liquid crystal panel 10 by the two dies 183 and 184. .
As described above, in the present embodiment, the light guide plate 80, the light-emitting element 89, the strip portion 210 of the flexible substrate 200, the optical sheets (the reflection sheet 187, the diffusion plate 182, the cymbals 183, 184), and the light source driving IC 280 (Light source driving unit) constitutes the lighting device 8. Here, the strip portion 210 of the flexible substrate 200 extends along the opposite sides of the light guide plate 80. As will be described later with reference to FIG. 3 and the like, the light-emitting elements 89 are disposed on opposite sides of the light guide plate 80. Light source drive The IC 280 (light source driving unit) selectively drives a plurality of light-emitting elements 89 in conjunction with driving of the liquid crystal panel, and controls the amount of emitted light from the light-emitting surface for each of the plurality of light-guiding plate portions.
Further, the resin frame 30 has a rectangular frame shape and includes four side walls 31 opposed to the side end portions of the liquid crystal panel 10. A step portion 36 is formed inside the three side walls 31 of the four side walls 31. The liquid crystal panel 10 is fixed to the step portion 36 by a double-sided tape or the like, and the light guide plate 80 or the light-emitting element 89 of the illumination device 8 is disposed inside the step portion 36. The lower metal frame 40 is formed by pressing a thin metal plate such as a SUS plate. The lower metal frame 40 includes a bottom plate portion 43 and four side plate portions 41 that are raised from the outer periphery of the bottom plate portion 43, and has a rectangular box shape in which the upper surface is opened. The resin frame 30 is held on the bottom plate portion 43 of the lower metal frame 40. Similarly to the lower metal frame 40, the upper metal frame 50 is formed by pressing a thin metal plate such as a SUS plate. The upper metal frame 50 includes a rectangular upper plate portion 53 and four side plate portions 51 which are bent downward from the outer peripheral edge of the upper plate portion 53 and have a rectangular box shape with a lower surface open. The side plate portion 51 covers the side end portion of the liquid crystal panel 10, and the upper plate portion 53 covers the display light emission side of the liquid crystal panel 10. Here, a rectangular opening portion 530 that emits light emitted from the liquid crystal panel 10 is formed on the upper plate portion 53 of the upper metal frame 50. Therefore, the upper plate portion 53 of the upper metal frame 50 covers the outer peripheral end portion of the display light emission side of the liquid crystal panel 10 across the entire circumference. In the lower metal frame 40, the side plate portion 41 is formed with a hook portion 45 that is obliquely downward by the lifting process of the opposite side plate portion 41, and the upper metal frame 50 is smashed by the opposite side plate portion 51 at the side plate portion 51. The hook portion 55 that faces obliquely upward is formed by machining. Therefore, the state in which the lower metal frame 40 and the upper metal frame 50 are superposed on the liquid crystal panel 10, the illumination device 8, and the resin frame 30 When the upper metal frame 50 is pressed toward the lower metal frame 40, the hook portions 45 and 55 are automatically engaged with each other, and the upper metal frame 50 and the lower metal frame 40 are joined to each other by the side plate portions 41 and 51.
(Detailed configuration of the lighting device 8)
3 is an explanatory view showing a configuration of a main part of an illumination device 8 according to Embodiment 1 of the present invention, and FIGS. 3(a) and 3(b) are explanatory views showing a planar configuration of the illumination device 8, and X1-FIG. An illustration of the case where the X1' line cuts off the lighting device 8. In the following description, the first direction, the second direction, and the third direction respectively correspond to the following directions: the first direction=the Y-axis direction
2nd direction = X-axis direction
In the third direction=Z-axis direction, the “first side” corresponds to the short side 812, and the “second side” corresponds to the long side 811.
As shown in FIG. 3, in the illuminating device 8 of the present embodiment, the light guide plate 80 has a Y-axis direction (first direction) and an X-axis direction (second direction) that intersect each other in the in-plane direction of the light-emitting surface 85. a plurality of light guide plate portions 81 (81a to 81f) having a trapezoidal shape having different lengths on opposite sides in the Y-axis direction are arranged side by side in the X-axis direction, and are disposed on the light guide plate 80 A light-emitting element 89 is disposed in a one-to-one relationship. In the present embodiment, the light-emitting element 89 is an LED (Light Emitting Diode) that emits white light, and the light source light is emitted as divergent light.
Here, the plurality of light guide plate portions 81 are alternately arranged in the X-axis direction with their opposite directions in the Y-axis direction. Therefore, the adjacent light guide plate portions 81 of the plurality of light guide plate portions 81 have the opposite directions in the Y-axis direction. More specifically, complex The light guide plate portions 81a, 81c, and 81e of the plurality of light guide plate portions 81 have the long side 811 of the opposite sides in the Y-axis direction toward the Y1 side in the Y-axis direction, and the short side 812 toward the Y-axis direction. Side Y2. On the other hand, in the light guide plate portions 81b, 81d, and 81f, the long side 811 is directed to the other side Y2 in the Y-axis direction, and the short side 812 is directed to the one side Y1 of the Y-axis direction. Further, the plurality of light guide plate portions 81 each have the same shape, and include a side edge 813 extending in a direction orthogonal to the long side 811 and the short side 812 to connect the ends of the long side 811 and the short side 812 to each other; The beveled edge 814 extends obliquely to join the other ends of the long side 811 and the short side 812 to each other. Therefore, when the two light guide plate portions 81a and 81b are disposed such that the oblique sides 814 are in contact with each other, the light guide plate portions 81a and 81b have a rectangular shape in which the long sides extend in the Y-axis direction. Further, the other light guide plate portions (the light guide plate portions 81c and 81d and the light guide plate portions 81e and 81f) are also the same. Therefore, only the two light guide plate portions 81 are combined so that the oblique sides 814 are in contact with each other, and the light guide plate 80 having a rectangular planar shape can be formed.
In the present embodiment, the light guide plate portion 81 has a thickness of, for example, 1 mm, a length dimension of 75 mm in the Y-axis direction, a length of 13 mm on the long side 811, and a length of 4 mm on the short side 812. Therefore, the light guide plate has a planar size of 51 mm × 75 mm.
When the light-emitting element 89 is disposed in the light guide plate 80 having the above-described configuration, in the present embodiment, the end surface on the short side 812 side of any of the plurality of light guide plate portions 81 is the light incident portion 88, and the light-emitting element 89 makes The light emitting surface faces the light incident portion 88. Further, in the light guide plate portion 81, a scattering pattern is formed on the surface on the side where the reflection sheet 187 is located. In the present embodiment, the density of the scattering pattern increases as it moves away from the light-emitting element 89. Therefore, regardless of the distance from the light-emitting element 89, Anyway, the intensity distribution of the illumination light emitted from the light guide plate portion 81 is made uniform. As the scattering pattern, a configuration in which concave pits are provided on the surface of the light guide plate portion or a configuration in which a scattering member is printed may be employed.
In the present embodiment, each of the plurality of light guide plate portions 81 includes an independent resin plate, and the end faces of the side edges 813 and the oblique sides 814 are light scattering surfaces 821 to which fine concavities and convexities are imparted by scattering processing. Therefore, a light-scattering surface 821 is provided between the light guide plate portions 81 adjacent to each other in the Y-axis direction. On the other hand, in the light guide plate portion 81, the end surface on the short side 812 side of the light incident portion 88 is a flat surface without being scattered, so as to increase the incidence efficiency of the light source light entering the light guide plate portion 81. In the light guide plate portion 81, the end surface on the long side 811 side opposite to the light incident portion 88 is a flat surface. Therefore, the light reaching the end surface on the long side 811 side is reflected and propagates again in the light guide plate portion 81. .
(exit characteristics of illumination light)
FIG. 4 is an explanatory view showing the emission intensity when the illumination light is emitted from the light guide plate portion 81 of the illumination device 8 according to the first embodiment of the present invention. In the liquid crystal device 100 of the present embodiment, the area dimming method is employed, and in the liquid crystal panel 10, the illumination device 8 increases the emission intensity of the illumination light in the region where the image with high brightness is displayed, and displays the image with lower brightness. In the area, the illumination device 8 reduces the emission intensity of the illumination light. At the time of the lighting operation, for example, as shown in FIG. 4, the light-emitting elements 89 of the light guide plate portion 81e provided in the plurality of light guide plate portions 81 are turned on, and the light-emitting elements 89 on both sides enter the light-off state.
In this case, first, the illumination light of uniform intensity is emitted from the light guide plate portion 81e regardless of the position. Here, the plurality of light guide plate portions 81 respectively include independent resin plates, and the end faces corresponding to the side edges 813 and the oblique sides 814 are scattered. surface. Therefore, a part of the light traveling in the light guide plate portion 81e is emitted from the end faces corresponding to the side edges 813 and the oblique sides 814, and is incident on the adjacent light guide plate portions 81d and 81f. Therefore, the emission intensity of the illumination light is smoothly reduced between the adjacent light guide plate portions 81 (the boundary portion), so that the emission intensity of the illumination light can be suppressed from being drastically changed.
(The main effect of this form)
As described above, in the present embodiment, when the image contrast is improved or the power consumption is reduced by the area dimming, the trapezoidal shape having the lengths of the opposite sides in the Y-axis direction (the first direction) is different. The light guide plate portion 81 having a planar shape is arranged in the X-axis direction (second direction) with the opposite directions in the Y-axis direction. Further, the light source light emitted from the light-emitting element 89 from the end surface of the light guide plate portion 81 located in the Y-axis direction is incident on the light guide plate portion 81. Therefore, unlike the case of using an integrated light guide plate, excessive light diffusion of the light source can be suppressed, so that the emission intensity of the illumination light can be preferably controlled for each region.
Here, the light-emitting element 89 causes the light source light to enter the light guide plate portion 81 from the end surface on the short side 812 side of the light guide plate portion 81. Therefore, it is possible to prevent the size of the end surface (light incident portion 88) where the light source light is incident on the light guide plate portion 81 from being excessively larger than the size of the light-emitting element 89 in the X-axis direction. Therefore, even if the light-emitting element 89 is not excessively separated from the light incident portion 88 of the light guide plate portion 81, the portion of the light guide plate portion 81 opposed to the light-emitting element 89 is offset from the region in the X-axis direction. The difference in the amount of incident light from the source light is also small. Therefore, when the illumination light is emitted from the light guide plate portion 81, the emission intensity of the illumination light from the portion facing the light-emitting element 89 in the vicinity of the light incident portion 88 of the light guide plate portion 81 is offset from the X-axis direction from the region. Photo of the location The difference in the exit intensity of the light is small. Therefore, even when a plurality of light guide plate portions 81 extending in the Y-axis direction are arranged in the X-axis direction, the number of the light guide plate portions 81 or the light-emitting elements 89 is relatively small, and illumination in the Y-axis direction can be performed. The relatively small size of the device 8 achieves uniformization of the emission intensity of the illumination light.
Further, in the present embodiment, since the light-scattering surface 821 is provided between the adjacent light guide plate portions 81, a part of the light is leaked from the light guide plate portion 81 to the adjacent light guide plate portion 81. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing at the boundary portion between the adjacent light guide plate portions 81. Therefore, a high quality image can be displayed.
Further, since the plurality of light guide plate portions 81 have a trapezoidal planar shape in which both sides (long side 811 and short side 812) are parallel, the light-emitting elements 89 on both sides in the Y-axis direction of the light guide plate 80 are straight along the X-axis direction. The composition of the arrangement. Therefore, the simplification of the configuration in which the substrate on which the light-emitting element 89 is mounted (the strip portion 210 of the flexible substrate 200) is linearly extended can be realized. Further, the plurality of light guide plate portions 81 include a beveled edge 814 and a side edge 813 that extends orthogonal to the two sides (the long side 811 and the short side 812). Therefore, the light guide plate 80 can be made rectangular only by arranging the light guide plate portion 81 so that the side edges 813 are disposed outside.
Further, in the present embodiment, when the light-scattering surface 821 is provided between the light-guide plate portions 81 adjacent to each other in the Y-axis direction, both the side 813 and the oblique side 814 are used as the light-scattering surface 821, but they may be The side edge 813 or the oblique side 814 of one of the light guide plate portions 81 adjacent to each other in the Y-axis direction is a light-scattering surface 821. In this configuration, since the light-scattering surface 821 is shared between the light-guide plate portions 81 adjacent in the Y-axis direction, it is possible to obtain both the side 813 and the oblique side 814 as the light-scattering surface 821. The same effect. Again, in When the side 813 or the oblique side 814 of one of the light guide plate portions 81 adjacent to each other in the Y-axis direction is a light-scattering surface 821, since the object to be subjected to the scattering treatment is limited, it can be improved. productivity.
Further, in the present embodiment, the end surface on the long side 811 side opposite to the light incident portion 88 is a flat surface. However, the end surface on the long side 811 side may be a scattering surface or a reflecting surface. At this time, the utilization efficiency of light propagating in the light guide plate 80 can be improved.
[Embodiment 2]
Fig. 5 is an explanatory view showing a planar configuration of the illumination device 8 according to the second embodiment of the present invention. In the first embodiment, an example of the area dimming method is used. However, in the present embodiment, an example of the scanning backlight is used, that is, in addition to the area dimming, and as indicated by the arrow Y0, the liquid crystal panel 10 is lined up. The action of the sequential scanning pixels shifts the area from which the illumination light from the illumination device 8 exits. Therefore, in the following description, the first direction, the second direction, and the third direction respectively correspond to the following directions: the first direction = the X-axis direction
2nd direction = Y axis direction
The third direction is the Z-axis direction. The basic configuration of the present embodiment is the same as that of the first embodiment. Therefore, the same reference numerals will be given to the same portions, and the description thereof will be omitted.
As shown in FIG. 5, in the illumination device 8 of the present embodiment, the arrangement direction of the light guide plate portion 81 is rotated by 90°, and the number of the light guide plate portions 81 is increased. More specifically, the light guide plate 80 is configured to have a trapezoidal shape having different lengths parallel to each other in the X-axis direction. The plurality of light guide plate portions 81 (81a to 81h) having a shape are arranged side by side in the Y-axis direction, and the light-emitting elements 89 having a one-to-one relationship with the light guide plate portion 81 are disposed.
Here, the plurality of light guide plate portions 81 are alternately arranged in the Y-axis direction with the directions in the X-axis direction opposite to each other. Therefore, the adjacent light guide plate portions 81 of the plurality of light guide plate portions 81 have the opposite directions in the Y-axis direction. Further, the plurality of light guide plate portions 81 each have the same shape, and include a side edge 813 that is orthogonal to the long side 811 and the short side 812, and a beveled edge 814. Therefore, when the adjacent light guide plate portions 81a and 81b are disposed such that the oblique sides 814 are in contact with each other, the light guide plate portions 81a and 81b have a rectangular shape in which the long sides extend in the Y-axis direction. Further, the other light guide plates (the light guide plate portions 81c and 81d, the light guide plate portions 81e and 81f, and the light guide plate portions 81g and 81h) are also the same. Therefore, the light guide plate 80 has a rectangular planar shape.
In the present embodiment, the light guide plate portion 81 has, for example, a thickness of 1 mm, a length dimension of 51 mm in the X-axis direction, a length of 15 mm on the long side 811, and a length of 4 mm on the short side 812. Therefore, the light guide plate has a planar size of 51 mm × 76 mm.
When the light-emitting element 89 is disposed on the light guide plate 80 having the above-described configuration, the present embodiment is the same as the first embodiment, and the end surface on the short side 812 side of any of the plurality of light guide plate portions 81 is the light incident portion 88. Further, the light-emitting element 89 faces the light-emitting surface 88 toward the light-emitting portion 88. Further, in the light guide plate portion 81, a scattering pattern is formed on the surface on the side where the reflection sheet 187 is located, and the intensity distribution of the illumination light emitted from the light guide plate portion 81 is uniform regardless of the distance from the light-emitting element 89. Chemical. Further, the plurality of light guide plate portions 81 respectively include independent resin plates, and the end faces corresponding to the side edges 813 and the oblique sides 814 are distributed by scattering processing. A light scattering surface 821 having fine irregularities is provided. Therefore, a light-scattering surface 821 is provided between the light guide plate portions 81 adjacent to each other in the Y-axis direction. On the other hand, in the light guide plate portion 81, the end surface on the short side 812 side of the light incident portion 88 and the end surface on the long side 811 side opposite to the light incident portion 88 are flat surfaces.
Further, in the present embodiment, as in the first embodiment, when the light-scattering surface 821 is provided between the light-guide plate portions 81 adjacent to each other in the Y-axis direction, both the side 813 and the oblique side 814 are used as light scattering. The surface 821 may be configured such that the side 813 or the oblique side 814 of one of the light guide plate portions 81 adjacent to each other in the Y-axis direction is a light-scattering surface 821. In this configuration, since the light-scattering surface 821 is shared between the light-guide plate portions 81 adjacent in the Y-axis direction, both the side 813 and the oblique side 814 can be obtained as the light-scattering surface 821. The same effect. Further, when the side 813 or the oblique side 814 of one of the light guide plate portions 81 adjacent to each other in the Y-axis direction is a light-scattering surface 821, the object to be subjected to the scattering treatment is limited. Therefore, productivity can be improved. In the present embodiment, as in the first embodiment, the end surface on the long side 811 side opposite to the light incident portion 88 is a flat surface. However, the end surface on the long side 811 side may be a scattering surface or a reflecting surface. In this case, the utilization efficiency of light propagating in the light guide plate 80 can be improved.
As described above, in the present embodiment, when the image contrast is improved or the power consumption is reduced by the area dimming and the power consumption is reduced by the scanning backlight method, the pair has the X-axis direction (the first direction). The light guide plate portion 81 having a trapezoidal shape having a different length in parallel to both sides is arranged in the Y-axis direction (second direction) with the opposite directions in the Y-axis direction. Further, the self-illuminating element is formed on the end surface of the light guide plate portion 81 located in the X-axis direction. The light source light emitted from 89 is incident on the light guide plate portion 81. Therefore, unlike the case of using an integrated light guide plate, the light source light transition diffusion can be suppressed, so that the emission intensity of the illumination light can be preferably controlled for each region. Further, when the scanning backlight method is employed, since the scanning on the liquid crystal panel 10 is synchronized with the scanning of the backlight, it is possible to alleviate the afterimage such as when the animation is displayed.
Further, the light-emitting element 89 enters the light source light into the light guide plate portion 81 from the end surface on the short side 812 side of the two sides of the light guide plate portion 81 which are parallel to each other in the X-axis direction. Therefore, it is possible to prevent the size of the end surface (light incident portion 88) where the light source light is incident on the light guide plate portion 81 from being excessively larger than the size of the light-emitting element 89 in the Y-axis direction. Therefore, even if the light incident portion 88 of the light guide plate portion 81 is not excessively separated from the light-emitting element 89, the light guide plate portion 81 is opposed to the light-emitting element 89 at a position offset from the region in the Y-axis direction. The difference in the amount of incident light of light is also small. Therefore, when the illumination light is emitted from the light guide plate portion 81, in the vicinity of the light incident portion 88 of the light guide plate portion 81, the emission intensity from the portion of the illumination light that opposes the light-emitting element 89 is shifted from the region to the Y-axis direction. The difference in the exit intensity of the illumination light at the shifted position is small. Therefore, even when a plurality of light guide plate portions 81 extending in the X-axis direction are arranged in the Y-axis direction, the number of the light guide plate portions 81 or the light-emitting elements 89 is relatively small, and illumination in the X-axis direction can be performed. The relatively small size of the device 8 achieves uniformization of the emission intensity of the illumination light.
Further, in the present embodiment, since the light-scattering surface 821 is provided between the adjacent light guide plate portions 81, a part of the light is leaked from the light guide plate portion 81 to the adjacent light guide plate portion 81. Therefore, the same effect as that of the first embodiment can be achieved by suppressing the sudden change in the emission intensity of the illumination light to the boundary portion of the adjacent light guide plate portion 81.
[Embodiment 3]
6 is an explanatory view showing a planar configuration of an illumination device 8 according to Embodiment 3 of the present invention, and FIGS. 6(a) and 6(b) are explanatory views showing a case where the liquid crystal device 100 is used in a horizontally long direction and a liquid crystal using a vertically long length. An illustration of the situation of device 100. In addition, since the basic configuration of this embodiment is the same as that of the first and second embodiments, the same reference numerals will be given to the same portions, and the description thereof will be omitted.
As shown in Fig. 6(a), the liquid crystal device 100 including the illumination device 8 of the present embodiment has a diagonal display of an image display area of the liquid crystal panel 10 of 3.5 inches and a pixel number of 320 x 480. Further, the light guide plate 80 has a size of 51 mm × 75 mm and a thickness of 1 mm. In the present embodiment, the light guide plate 80 of the illumination device 8 has a configuration in which the number of the light guide plate portions 81 is reduced to six from the light guide plate 80 of the second embodiment. The liquid crystal device 100 including the illumination device 8 is used in a horizontal length when displaying an animation such as a TV. In the horizontally long state, in the illumination device 8 of the present embodiment, as indicated by an arrow SY, the backlight is scanned from the upper side of the screen to the lower side, and is the same as the scanning direction in the liquid crystal panel 10. Therefore, the afterimage such as the animation can be alleviated, and the effect of the area dimming can be obtained.
In the case of this configuration, as shown in FIG. 6(b), when the liquid crystal device 100 is rotated by 90° to be vertically long, the backlight is scanned from the left side to the right side of the screen as indicated by an arrow SX. In such a case, the vertical image is often displayed as a still image in a still image. Therefore, even if the backlight is scanned from the left side to the right side of the screen, it is difficult to cause an image such as afterimage.
[Modification 1 of Embodiments 1 to 3]
Fig. 7 is a view showing a lighting device 8 according to a first modification of the first to third embodiments of the present invention. An illustration of the cross-sectional configuration. In addition, since the basic configuration of this embodiment is the same as that of Embodiments 1 to 3, the same reference numerals will be given to the same portions, and the description thereof will be omitted.
In the first to third embodiments, the plurality of light guide plate portions 81 each include an independent resin plate, and all the end faces corresponding to the side 813 and the oblique side 814 are used as the light scattering surface 821. However, in this embodiment, as shown in FIG. As shown in (a), a light scattering surface 821 is provided in one of the thickness directions of the light guide plate 80 between the adjacent light guide plate portions 81, and a reflection surface 822 is provided in the other portion. In the present embodiment, about 1/3 of the thickness direction of the light exit surface 85 to the light guide plate 80 between the adjacent light guide plate portions 81 is the light scattering surface 821, and about 2/3 of the remaining is the reflection surface 822. The reflecting surface 822 can be realized by providing a reflecting layer such as aluminum or a part of the end surface of the light guiding plate portion 81 as a mirror surface. Further, the reflecting surface 822 may be provided, for example, on the light emitting surface 85 side, or may be provided at a position intermediate the thickness direction of the light guiding plate 80.
According to this configuration, by adjusting the ratio of the light-scattering surface 821 and the reflecting surface 822, the amount of light leaking from the light guiding plate portion 81 to the adjacent light guiding plate portion 81 via the light-scattering surface 821 can be adjusted, and the reflecting surface 822 can be adjusted. The amount of light that is reflected and returned to the light guide plate portion 81. For example, light leaking to a region corresponding to 10 pixels to 20 pixels from the light guide plate portion 81 via the light-scattering surface 821 can reach the adjacent light guide plate portion 81. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing between the adjacent light guide plate portions 81 (the boundary portion), and to optimize the amount of illumination light emitted from the light guide plate portion 81.
In the present embodiment, when the light-scattering surface 821 and the reflecting surface 822 are provided between the adjacent light guiding plate portions 81, the light guiding plate portions adjacent to each other in the Y-axis direction are provided. The light-scattering surface 821 and the reflecting surface 822 are formed on both of the 81, but the light-scattering surface 821 and the reflecting surface 822 may be provided in the light-guide plate portion 81. In this configuration, since the light-scattering surface 821 and the reflecting surface 822 are shared between the light-guide plate portions 81 adjacent in the Y-axis direction, it is possible to provide light to both of the adjacent light guiding plate portions 81. The same effect is obtained in the case of the scattering surface 821 and the reflecting surface 822. At this time, if the light-scattering surface 821 is provided on one of the light guiding plate portions 81 adjacent to each other in the Y-axis direction, and the reflecting surface 822 is provided on the other light guiding plate portion 81, the light guiding plate 80 can be simplified. Manufacturing steps.
In the light guide plate 80 shown in FIG. 7(b), between the adjacent light guide plate portions 81, a light scattering surface 821 is provided in one of the thickness directions of the light guide plate 80, and a gap is provided in the other portion. 823. In the present embodiment, about 1/2 of the thickness direction from the light exit surface 85 to the light guide plate 80 between the adjacent light guide plate portions 81 is a gap 823, and about 1/2 of the remaining light scattering surface 821. The gap 823 can be realized by providing a step on the end surface of the light guide plate portion 81, and the inside of the gap 823 is an air layer. Further, the gap 823 may be provided, for example, on the side where the reflection sheet 187 is located.
According to this configuration, the end surface of the light guide plate portion 81 and the air layer in the gap 823 are reflected, and a part of the light is incident on the adjacent light guide plate portion 81 via the gap 823. Therefore, by adjusting the ratio of the light-scattering surface 821 and the gap 823, the amount of light leaking from the light guide plate portion 81 to the adjacent light guide plate portion 81, and the air at the end face of the light guide plate portion 81 and the gap 823 can be adjusted. The amount of light reflected by the interface of the layer and returned to the light guide plate portion 81. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing between the adjacent light guide plate portions 81 (the boundary portion), and to optimize the amount of illumination light emitted from the light guide plate portion 81.
Here, the portion of the light guide plate portion 81 as the gap 823 is preferably a flat surface. According to this configuration, light reflection can be efficiently performed, and the light use efficiency can be improved. When the light-scattering surface 821 and the gap 823 are provided between the adjacent light-guide plate portions 81, the light-scattering surface 821 and the gap 823 are formed in the light-guide plate portion 81 adjacent to each other in the Y-axis direction. Although a slit is formed, a light-scattering surface 821 and a slit (gap 823) may be provided in one of the light guide plate portions 81. In this configuration, since the light-scattering surface 821 and the gap 823 are shared between the light-guide plate portions 81 adjacent to each other in the Y-axis direction, it is possible to provide a light-scattering surface on both of the adjacent light-guide plate portions 81. The same effect as in the case of 821 and gap 823. At this time, if one light guide surface 821 is provided in one of the light guide plate portions 81 adjacent to each other in the Y-axis direction, and a slit (gap 823) is provided in the other light guide plate portion 81, the light guide plate 80 can be simplified. Manufacturing steps.
In the light guide plate 80 shown in FIG. 7(c), the gap 82 between the adjacent light guide plate portions 81 is a gap 823 as a whole. According to this configuration, the end surface of the light guide plate portion 81 and the air layer in the gap 823 are reflected, and a part of the light is incident on the adjacent light guide plate portion 81 via the gap 823. Therefore, the amount of light leaking from the light guide plate portion 81 to the adjacent light guide plate portion 81 and the amount of light reflected from the interface between the end surface of the light guide plate portion 81 and the air layer in the gap 823 and returning to the light guide plate portion 81 can be adjusted. Therefore, it is possible to suppress the emission intensity of the illumination light from rapidly changing between the adjacent light guide plate portions 81 (the boundary portion), and to optimize the amount of illumination light emitted from the light guide plate portion 81.
Here, the portion of the light guide plate portion 81 as the gap 823 is preferably a flat surface. According to this configuration, light reflection can be efficiently performed, and the light use efficiency can be improved. Further, it may be adjacent to the Y-axis direction via the gap 823. One end of one of the light guide plate portions 81 of the light guide plate portion 81 is provided with a light-scattering surface, and the end surface of the other light guide plate portion 81 is a flat surface.
[Modification 2 of Embodiments 1 to 3]
FIG. 8 is an explanatory view showing a configuration of a main part of an illumination device according to a second modification of the first to third embodiments of the present invention. In addition, since the basic configuration of this embodiment is the same as that of the first to third embodiments, the same reference numerals will be given to the same portions, and the description thereof will be omitted.
In the first to third embodiments, the thickness of the light guide plate portion 81 is fixed. However, as shown in FIGS. 8(a) and 8(b), the plurality of light guide plate portions 81 may have a thickness in the first direction (long side). The configuration in which 811 and the short side 812 are opposite directions are continuously changed. Here, in the light guide plate 80 shown in FIG. 8(a), the thickness of the light guide plate portion 81 continuously increases from the long side 811 side toward the short side 812 side. On the other hand, in the light guide plate 80 shown in FIG. 8(b), the thickness of the light guide plate portion 81 continuously decreases from the long side 811 side toward the short side 812 side.
In the case of the configuration shown in FIG. 8(a) in this configuration, the light source emitted from the light-emitting element 89 is likely to reach the front end side with a sufficient amount of light after entering the light guide plate portion 81. Therefore, there is an advantage that the emission intensity of the illumination light emitted from the light guide plate portion 81 can be made uniform.
[Other Embodiments]
In the above embodiment, the light guide plate portion 81 includes a side edge 813 which is orthogonal to the long side 811 and the short side 812, and a beveled edge 814. However, the light guide plate portion 81 may have a trapezoidal shape having two oblique sides. In the above embodiment, the light guide plate portions 81 having the opposite directions in the first direction are alternately arranged in the second direction. For example, the light guide plate portions 81 having the opposite directions in the first direction may be two in the second direction. Ground configuration.
[Example of being mounted on an electronic device]
Next, an electronic device to which the liquid crystal device 100 of the above embodiment is applied will be described. Fig. 9(a) shows the configuration of the mobile phone 3000. The mobile phone 3000 includes a plurality of operation buttons 3001, a scroll button 3002, and a liquid crystal device 100 as a display unit. By operating the scroll button 3002, the screen displayed in the liquid crystal device 100 is scrolled. Fig. 9(b) shows the configuration of the information carrying terminal 4000. The information carrying terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and a liquid crystal device 100 as a display unit. When the power switch 4002 is operated, various information such as an address book or a schedule is displayed.
Further, as an electronic device to which the liquid crystal device 100 is applied, in addition to the electronic device shown in FIGS. 9(a) and 9(b), the liquid crystal television 2000 shown in FIG. 9(c) or FIG. 9 can be exemplified ( d) The display of the notebook computer 1000 shown. In addition, as an example of the electronic device shown in FIG. 9, a car navigation device, a pager, an electronic organizer, a calculator, a word processor, a workstation, a digital camera, a videophone, and a POS (Point of Sale) can be cited. The liquid crystal device 100 can be applied to the display unit of the various electronic devices.
8‧‧‧Lighting device
10‧‧‧LCD panel
80‧‧‧Light guide plate
81‧‧‧Light Guide Board
85‧‧‧Light exit surface
88‧‧‧Light incident section
89‧‧‧Lighting elements (light source)
100‧‧‧Liquid device
811‧‧‧Longside (2nd side)
812‧‧‧ Short side (1st side)
821‧‧‧Light scattering surface
822‧‧‧reflecting surface
823‧‧‧ gap
1(a) and 1(b) are explanatory views showing the overall configuration of a liquid crystal device according to Embodiment 1 of the present invention.
Fig. 2 is an exploded perspective view showing the liquid crystal device according to the first embodiment of the present invention.
3 (a) and (b) are explanatory views showing the configuration of a main part of an illumination device according to Embodiment 1 of the present invention.
Fig. 4 is an explanatory view showing an emission intensity when one of the light guide plate portions of the illumination device according to the first embodiment of the present invention emits illumination light.
Fig. 5 is an explanatory view showing a planar configuration of an illumination device according to a second embodiment of the present invention.
(a) and (b) of FIG. 6 are explanatory views showing a planar configuration of an illumination device according to a third embodiment of the present invention.
7(a) to 7(c) are explanatory views showing a cross-sectional configuration of a lighting device according to a first modification of the first to third embodiments of the present invention.
(a) and (b) of FIG. 8 are explanatory views showing a configuration of a main part of an illumination device according to a second modification of the first to third embodiments of the present invention.
9(a)-(d) are explanatory views of an electronic apparatus including a liquid crystal device to which the present invention is applied.
10(a) and (b) are explanatory views of the prior lighting device.
8‧‧‧Lighting device
10‧‧‧LCD panel
80‧‧‧Light guide plate
81‧‧‧Light Guide Board
81a‧‧‧Light Guide Board
81b‧‧‧Light Guide Board
81c‧‧‧Light Guide Board
81d‧‧‧Light Guide Board
81e‧‧‧Light Guide Board
81f‧‧‧Light Guide Board
82‧‧‧Between the light guides
88‧‧‧Light incident section
89‧‧‧Lighting elements
100‧‧‧Liquid device
182‧‧‧Diffuser
183‧‧‧ Picture
184‧‧‧ Picture
187‧‧‧reflector
811‧‧‧Longside (2nd side)
812‧‧‧ Short side (1st side)
813‧‧‧ side
814‧‧‧ oblique side
821‧‧‧Light scattering surface

Claims (12)

  1. A liquid crystal device comprising: an illumination device; and a liquid crystal panel disposed on a side of the light exit surface of the illumination device, wherein the illumination device comprises: a light guide plate comprising a plurality of light guide plate portions having a planar shape, Each of the plurality of light guide plate portions has a first side and a second side opposite to each other in the first direction, and the length of the second side is longer than the length of the first side, and is in a plane of the light exit surface The second direction orthogonal to the first direction is arranged such that the first side of the first light guide plate portion and the second side of the second light guide plate portion are adjacent to each other; and at least one The light-emitting element is disposed in each of the plurality of light guide plate portions such that the light-emitting surface faces the first side.
  2. The liquid crystal device according to claim 1, wherein the light guide plate portion has a trapezoidal planar shape in which the first side and the second side are parallel.
  3. The liquid crystal device according to claim 1 or 2, wherein the light guide plate portion includes a beveled edge extending in the first direction to connect one end of the first side and one end of the second side; and a side thereof The other end of the first side and the other end of the second side are connected so as to extend orthogonally to the first side and the second side.
  4. The liquid crystal device according to any one of claims 1 to 3, wherein a light-scattering surface is provided between adjacent ones of the plurality of light-guiding plate portions.
  5. The liquid crystal device according to claim 4, wherein the light-scattering surface is provided in one of a thickness direction of the light-guiding plate portion between the adjacent ones of the plurality of light-guiding plate portions, and is provided in another portion Reflective surface.
  6. The liquid crystal device according to claim 4, wherein the light-scattering surface is provided in one of a thickness direction of the light-guiding plate portion between the adjacent ones of the plurality of light-guiding plate portions, and is provided in another portion gap.
  7. The liquid crystal device according to any one of claims 1 to 3, wherein a gap is provided between adjacent ones of the plurality of light guide plate portions.
  8. The liquid crystal device according to any one of claims 1 to 7, wherein a plurality of the light guide plate portions continuously change in thickness in the first direction.
  9. The liquid crystal device according to claim 8, wherein a thickness of the plurality of light guide plate portions increases from a side of the second side toward a side of the first side.
  10. The liquid crystal device according to any one of claims 1 to 9, wherein the plurality of light guide plate portions are arranged such that the first side is adjacent to the second side by any one of the adjacent light guide plate portions.
  11. An electronic device comprising the liquid crystal device according to any one of claims 1 to 10 on the display unit.
  12. An illumination device comprising: a light guide plate comprising a plurality of light guide plate portions having a planar shape, wherein each of the plurality of light guide plate portions has a first side and a second side opposite to each other in a first direction; The length of the second side is longer than the length of the first side, and the first direction of the first light guide plate portion is in the second direction orthogonal to the first direction in the in-plane direction of the light exit surface a plurality of the light guide elements are arranged adjacent to the second side of the second light guide plate portion; and at least one light emitting element is disposed on each of the plurality of light guide plate portions such that the light emitting surface and the first side Configure the opposite way.
TW101122878A 2011-07-01 2012-06-26 Liquid crystal device, electronic apparatus and lighting device TWI560496B (en)

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JP2011253715A JP5821562B2 (en) 2011-07-01 2011-11-21 Liquid crystal device, electronic device and lighting device
JP2011253714A JP5867003B2 (en) 2011-07-01 2011-11-21 Liquid crystal device, electronic device and lighting device

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US8755007B2 (en) * 2011-07-01 2014-06-17 Seiko Epson Corporation Liquid crystal device, electronic apparatus and lighting device
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JP2731222B2 (en) * 1989-03-20 1998-03-25 松下電工株式会社 Surface lighting device
JP4440062B2 (en) 2004-10-08 2010-03-24 シャープ株式会社 Lighting device
JP4429870B2 (en) 2004-10-19 2010-03-10 シャープ株式会社 Liquid crystal display
TW200636356A (en) * 2005-04-15 2006-10-16 Hon Hai Prec Ind Co Ltd Light guide plate and backlight module
KR20070081564A (en) * 2006-02-13 2007-08-17 삼성전자주식회사 Backlight assembly and a display device provided with the same
JP4963454B2 (en) * 2007-08-27 2012-06-27 シチズン電子株式会社 Lighting device
JP2009163902A (en) * 2007-12-28 2009-07-23 Hitachi Ltd Liquid crystal display
JP2009218101A (en) * 2008-03-11 2009-09-24 Kuroda Denki Kk Surface light emitting device
KR20110021898A (en) * 2008-06-23 2011-03-04 소니 주식회사 Plane light source device and display device
JP2010177153A (en) * 2009-02-02 2010-08-12 Sony Corp Surface light source and display device
WO2010141679A2 (en) * 2009-06-03 2010-12-09 Rambus International Ltd. Liquid crystal display apparatus and light emitting assembly with light transmission control elements for illuminating same

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JP2013033193A (en) 2013-02-14
JP5867003B2 (en) 2016-02-24
KR102015136B1 (en) 2019-08-27
TWI560496B (en) 2016-12-01
CN203204270U (en) 2013-09-18
JP5821562B2 (en) 2015-11-24
KR20130004138A (en) 2013-01-09

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