JP2008277157A - Display device - Google Patents

Display device Download PDF

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Publication number
JP2008277157A
JP2008277157A JP2007119864A JP2007119864A JP2008277157A JP 2008277157 A JP2008277157 A JP 2008277157A JP 2007119864 A JP2007119864 A JP 2007119864A JP 2007119864 A JP2007119864 A JP 2007119864A JP 2008277157 A JP2008277157 A JP 2008277157A
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JP
Japan
Prior art keywords
guide plate
light guide
light
display device
surface
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2007119864A
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Japanese (ja)
Inventor
Kouji Tsumanuma
Mitsuru Uekatano
充 上片野
孝司 妻沼
Original Assignee
Fujikura Ltd
株式会社フジクラ
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Publication date
Application filed by Fujikura Ltd, 株式会社フジクラ filed Critical Fujikura Ltd
Priority to JP2007119864A priority Critical patent/JP2008277157A/en
Publication of JP2008277157A publication Critical patent/JP2008277157A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To position and fix light sources with respect to a light guide plate by a simple constitution. <P>SOLUTION: This display device is provided with: the transparent light guide plate 1; side surface emission type LED elements 4a, 4b and 4c arranged along the end surface 1a of the light guide plate 1, and used as the light sources; a plurality of recessed parts formed on the light guide plate 1 each having a reflecting surface reflecting light from the LED elements 4a, 4b and 4c entered from the end surface 1a of the light guide plate 1 toward the image display surface of the light guide plate 1; and a board 21 with the LED elements 4a, 4b and 4c mounted thereto, and with the end 1a of the light guide plate 1 mounted at a position where the LEDs 4a, 4b and 4c are arranged along the end surface of the light guide plate 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device used for a display or the like, and more particularly to a fixing structure between a side-emitting light emitting element and a light guide plate.

  In recent years, LEDs (light-emitting diodes) have been increasingly used for various purposes as high-efficiency, long-life light sources.

  LED is a point light source with directivity, and since it is limited to use as spot illumination by itself, it may be used as a linear or planar light source in combination with a light guide such as a transparent resin plate. Many. Examples include liquid crystal backlights and advertising light panels.

  In addition, as a display device having transparency and excellent design properties, there is a display device in which a surface of a light guide plate is roughened by laser processing or etching to form a display portion that forms a figure, a logo, or the like.

  This display device emits light from a light source provided on an end face of a light guide plate to raise a display unit, and is used for a display or the like.

A display device having a display unit in which LED elements are provided in a predetermined arrangement between two transparent glass plates is also used (see, for example, Patent Document 1).
European Patent No. 099199

  By the way, the LED element is called a cannonball type having a shape like a cannonball, a top view type, and is called a top emission type having a light emitting part on the upper surface side and a side view type, and a side surface having a light emitting part on the side surface side There are roughly three types of light-emitting types.

  However, when the LED elements described above are used for illumination of a display panel, these LED elements are mounted on a substrate and abutted against and fixed to the end face of the light guide plate. Parts are required, which is a factor that complicates the device configuration.

  In view of the above circumstances, an object of the present invention is to provide a display device capable of positioning and fixing a light source and a light guide plate with a simple device configuration.

  In order to achieve the above object, a display device according to the present invention is provided on a transparent light guide plate, a side-emitting light emitting element that is provided along an end surface of the light guide plate and serves as a light source, and the light guide plate. A plurality of recesses having a reflective surface for reflecting light from the light emitting element incident from the end face of the light guide plate to the image display surface side of the light guide plate, and a substrate on which the light emitting element is placed, An end portion of the light guide plate is overlapped with the substrate in a state in which an end surface of the light guide plate is abutted against the light emitting element.

  As an example of fixing the light guide plate and the substrate, an adhesive is interposed on the surface where the end portion of the light guide plate and the substrate are overlapped, and the two are fixed. This adhesive is made of a material having a lower refractive index than that of the light guide plate.

  Further, as another example of fixing the light guide plate and the substrate, the light guide plate and the substrate are positioned and fixed by a spring clip sandwiched so as to cover the end portion between the light guide plate and the back surface side of the substrate. Yes.

  According to the present invention, positioning and fixing between the light source and the light guide plate can be performed with a simple configuration.

<Basic configuration>
Prior to the description of the embodiments, first, the basic configuration of the display device according to the present invention will be described.

  1 is a perspective view schematically showing a display device according to the present invention, FIG. 2 is a cross-sectional view of the display device shown in FIG. 1, FIG. 3 is an enlarged cross-sectional view of the main part of the display device shown in FIG. FIG. 2 is a plan view of a dot-like reflecting portion of the display device shown in FIG.

  As shown in FIGS. 1 and 2, the display device 10 includes a transparent light guide plate 1 having parallel planes, and a light source 4 that is provided on the end surface 1 a of the light guide plate 1 and emits light toward the light guide plate 1. .

  As the light source 4, an LED, an LD (laser diode), or the like can be used. The light source 4 is preferably formed so as to extend along the extending direction of the light guide plate 1. In the example shown in FIGS. 1 and 2, the light guide plate 1 is formed to extend along the end surface 1 a on one side of the substantially rectangular light guide plate 1.

  As the light source 4, for example, a plurality of LEDs arranged in a direction along the end face 1a can be used. Moreover, the color of the light emitted from the light source 4 can be exemplified by white, red, green, blue, and the like, and can be appropriately selected according to the pattern formed by the dot-like reflection unit 2. The light source 4 can also be provided on one and the other end surfaces of the light guide plate 1.

  The light guide plate 1 may be a transparent material, and a plate made of a synthetic resin such as an acrylic resin, a polycarbonate resin, a silicone resin, a cyclopolyolefin resin, or a glass plate is used. Among them, transparency and easy processing are used. An acrylic board is preferable from the standpoints of height.

  The thickness of the light guide plate 1 can be set to 0.5 to 10 mm, for example. Moreover, it is preferable that the light-guide plate 1 has the light transmittance which can see the background through.

  In the present invention, the term “transparent” means that the reflected light from the dot-like reflecting portion 2 has such a light transmittance that it can be visually recognized. This definition is commonly used in the present invention.

  On the back surface 1 c of the light guide plate 1, a display unit 3 including a plurality of dot-like reflection units 2 is formed. As shown in FIG. 2, the dot-like reflecting portion 2 is a notch formed in the back surface 1c, and reflects light that is emitted from the light source 4 and incident from the end surface 1a to the front surface (image display surface) 1b side. It has surface 2a. The dot-like reflecting portion 2 is shaped so that the light from the light source 4 strikes the reflecting surface 2a. For example, the dot-like reflecting portion 2 has a substantially rectangular shape in plan view (see FIG. 4), and has a cross section that is a triangle having the reflecting surface 2a as a hypotenuse (see FIG. 3).

  The dot-like reflection part may be any structure that is formed in the light guide plate 1 and reflects the light from the light source 4 toward the surface (image display surface) 1b, and the configuration is not limited to the illustrated example. For example, it may be a notch having a cross-sectional shape such as a quadrilateral or more polygon (for example, trapezoid) or a sector. Moreover, the through-hole formed in the light-guide plate 1 may be sufficient, and the space part formed in the light-guide plate 1 may be sufficient.

  The aspect ratio (aspect ratio) (average value) of the dot-like reflecting portions 2 when viewed in plan is preferably in the range of 10: 1 to 1: 1, and preferably in the range of 5: 1 to 1: 1. Is more preferable.

  As shown in FIG. 4, the aspect ratio means β1: β2. β1 is the planar view length (length in the light incident direction) of the hypotenuse 2b of the dot-like reflector 2 shown in FIGS. 3 and 4, and β2 is the upper side 2c orthogonal to the light incident direction and This is the length of the lower side 2d.

  If the length β1 with respect to the length β2 is too large, the shape of the light from the dot-like reflecting portion 2 becomes close to a linear shape, which is not preferable because the transparency characteristic of the display device 10 is impaired. If the length β1 with respect to the length β2 is too small, the luminance of the dot-like reflecting portion 2 becomes too low. Note that β2: β1 can also be considered as an aspect ratio.

  The aspect ratio refers to the ratio of the long side to the short side (long side: short side) of the rectangle having the smallest area that is inscribed by the dot-like reflecting portion 2 in plan view.

  In addition, the planar view shape of the dot-shaped reflection part 2 is not limited to the illustrated example, and may be a polygon such as a triangle or a pentagon, a circle, or an ellipse.

  If the inclination angle (angle α shown in FIG. 3) of the reflection surface 2a with respect to the back surface 1c of the light guide plate 1 is too small, the inclination angle of the emitted light also increases, and the dot-like reflection portion 2 when the display device 10 is viewed from the front. Visibility is reduced. If the inclination angle α is too large, the incident angle of light exceeds the critical angle and the proportion of light transmitted through the reflecting surface 2a increases, so that the light reflection efficiency decreases and the light use efficiency decreases.

  For this reason, the inclination angle α of the reflecting surface 2a is preferably 45 degrees or more and 60 degrees or less, and more preferably 50 degrees or more and 55 degrees or less. By setting the inclination angle α in the above range, the light reflection efficiency can be increased, and the reflected light can be emitted at an angle close to perpendicular to the surface 1b, so that the visibility of the dot-like reflecting portion 2 can be enhanced.

  In the illustrated example, the reflecting surface 2a is flat, but at least a part of the reflecting surface may be curved. If the reflection surface is a curved surface, the emission angle of the reflected light may extend over a wide range. In this case, the dot-like reflection unit 2 can be viewed from a wide range. The reflecting surface 2a is preferably a smooth flat surface.

  If the height of the dot-like reflecting portion 2 (height γ shown in FIG. 3) is too small, the visibility of the dot-like reflecting portion 2 is lowered, and if too large, the transparency of the display device 10 is not preferable. The average value of the height γ of the dot-like reflecting portion 2 is preferably 0.1 to 5 mm, and more preferably 0.5 to 3 mm.

  The ratio (average value) of the height γ of the dot-like reflecting portion 2 to the thickness of the light guide plate 1 is preferably 1/10 to 1/1, and more preferably 1/5 to 2/3.

  In the dot-like reflecting portion 2, the brightness of the reflected light from the dot-like reflecting portion 2 is set according to the planar view area (β1 × β2) of the reflecting surface 2a. The planar view area of the reflecting surface 2a is adjusted by changing the height γ of the dot-like reflecting portion 2, the length β2 of the upper side 2c (lower side 2d), and the like, whereby the luminance of the reflected light of the dot-like reflecting portion 2 is adjusted. Adjusted.

  If the area of all the dot-like reflecting portions 2 is constant, the intensity of the reflected light at the dot-like reflecting portion 2 located far from the light source 6 tends to be lower than the reflected light at the dot-like reflecting portion 2 close to the light source 6. There is.

  For this reason, it is preferable to make the intensity of the reflected light of the dot-like reflection part 2 uniform by increasing the area of the dot-like reflection part 2 according to the distance from the light source 6.

  In the illustrated example, the display unit 3 is arranged so that a plurality of dot-like reflection units 2 form a predetermined pattern.

  “The dot-like reflecting portion 2 forms a predetermined pattern” means that the dot-like reflecting portion 2 has a densely arranged portion and a sparsely arranged portion. It means that it is arranged uniformly.

  In the example shown in FIG. 1, it has the part 4a where the dot-shaped reflection part 2 is arrange | positioned densely, and the part 4b arrange | positioned sparsely. The densely arranged portion 4a includes five linear array portions 5a to 5e in which a plurality of dot-like reflecting portions 2 are arrayed in a certain direction.

  It is preferable to arrange the dot-like reflecting portions 2 so as to form letters, symbols, figures, patterns, or a combination of two or more of these.

  In the display device 10, the front surface 1 b side (or the back surface 1 c side) of the light guide plate 1 is not provided with a configuration (for example, a light diffusing plate) that impairs the transparency of the display device 10. Is visible as a dot-like bright spot.

  A semitransparent layer may be provided on the front surface 1b side (or the back surface 1c side) of the light guide plate 1 as long as the dot-like reflecting portion 2 is observed as a dot-like bright spot.

  As shown in FIG. 3, in the display device 10, the light from the light source 6 can be incident on the light guide plate 1 from the end surface 1 a, reflected on the reflecting surface 2 a of the dot-like reflecting portion 2, and emitted from the surface 1 b side. . When viewed from the front surface 1b side, the dot-like reflecting portion 2 is observed as a dot-like bright spot.

  Most of the light from the light source 6 is reflected by the reflecting surface 2a and travels in a substantially constant direction (in the illustrated example, a direction perpendicular to the surface 1b), so that the intensity of the light is sufficiently increased. For this reason, even when observing at a distance, excellent visibility is obtained.

  Since the dot-like reflecting portions 2 are arranged so as to form a predetermined pattern, this pattern can be visually recognized by observing from the surface 1b side.

  In the display device 10, since the dot-like reflecting portion 2 is dot-like, the area is small, and the transparency of the display device 10 is not impaired. Further, since the structure is simple, manufacturing is easy and advantageous in terms of cost. Furthermore, since the light guide plate 1 and the light source 4 are separate bodies, there is an advantage that it is easy to replace the light guide plate 1 with a light guide plate having a different display unit.

  Next, an example of a method for manufacturing the display device 10 will be described with reference to FIGS.

  As shown in FIG. 5, a processing tool 13 in which a blade portion 12 is formed to protrude from the lower surface of the base portion 11 is used. The blade portion 12 has a shape corresponding to the dot-like reflecting portion 2, and the vertex angle (vertex angle δ shown in FIG. 5) of the blade portion 12 is preferably 10 to 40 degrees.

  In order to form the reflecting surface 2a smoothly, it is preferable that the inclined surface 12a of the blade portion 12 which is the surface forming the reflecting surface 2a is also formed smoothly.

  As shown in FIGS. 6 and 7, the processing tool 13 is lowered along the forming direction of the blade portion 12, the blade portion 12 is pushed into the back surface 1 c of the light guide plate 1, and the processing tool 13 is raised to raise the blade portion 12. Pull out.

  At this time, if one or both of the blade portion 12 and the light guide plate 1 are heated to a temperature equal to or higher than the softening point of the material of the light guide plate 1, the dot-like reflection portion 2 can be easily formed.

  As a result, a dot-like reflecting portion 2 having a shape along the blade portion 12 is formed on the back surface 1 c of the light guide plate 1.

  By moving the processing tool 13 horizontally and repeating the same operation, the display unit 3 including a plurality of dot-like reflection units 2 is formed, and the display device 10 shown in FIGS. 1 to 4 is obtained. In addition, when forming the dot-shaped reflection part 2 from which brightness | luminance differs, it replaces | exchanges for the processing tool 13 provided with the blade part 12 of a different size, and performs operation similar to the above.

  According to the manufacturing method using the processing tool 13, the dot-shaped reflection part 2 of an exact shape can be formed. Moreover, the reflective surface 2a can be formed smoothly.

  Other manufacturing methods include cutting, press molding, injection molding, and the like. Among these, cutting, press molding, and injection molding have the advantage that the reflecting surface 2a can be formed relatively smoothly. Moreover, press molding and injection molding can be accurately formed even with a small dot-like reflecting portion 2. Further, since the cutting process does not require a mold, the manufacturing cost can be reduced, which is particularly advantageous in the case of processing a light guide plate having a large area or small-scale production.

  Next, a preferred embodiment of a display device having the above-described basic configuration will be described with reference to FIGS.

<First Embodiment>
FIG. 8 is a perspective view showing a first embodiment of a display device according to the present invention. The same parts as those in the basic configuration shown in FIGS. 1 to 7 are denoted by the same reference numerals, and description thereof is omitted.

  In 1st Embodiment, in the board | substrate mounted in a line by aligning the light emission surface of several side light emission type LED element, a part of board | substrate protruded ahead (light guide plate side) rather than the light emission surface of an LED element. In addition, by fixing the light guide plate on the substrate, it is easy to align and fix the LED with respect to the light guide plate. As a result, the substrate is blinded and the LED element is directly visible from the outside. It is possible to suppress this.

  8, the light guide plate 1 receives light from the LED elements 4a, 4b, 4c,... Incident from the end face 1a on the surface of the light guide plate 1 (image display surface), as in FIG. A plurality of concave portions (dot-shaped reflective portion 2, not shown in FIG. 8) having a reflective surface that reflects toward the 1b side are formed.

  The LED elements 4 a, 4 b, 4 c,... Constituting the light source 4 are side-emitting light emitting elements having a light emitting part on the side surface, and are placed on the substrate 21. The substrate 21 has a sufficient area as compared with the mounting area of the LED elements 4a, 4b, 4c,. In particular, the end portion 1d of the light guide plate 1 is placed so that the light guide plate 1 has a wide space and the LED elements 4a, 4b, 4c,... Are aligned along the end surface 1a.

  The light guide plate 1 and the substrate 21 are positioned and fixed by adhesives 22a, 22b,... On the back side of the end 1d. These adhesives 22a, 22b,... Do not need to be provided over the entire back surface side of the end 1d, and may be provided at several locations (for example, about 3 locations) as shown in the figure. Further, as a material of the adhesives 22a, 22b,..., A silicon-based adhesive material that is a material having a lower refractive index than the light guide plate 1 of the light guide plate 1 is desirable.

  As described above, according to the first embodiment, positioning and fixing between the LED elements 4a, 4b, 4c,... Constituting the light source 4 and the light guide plate 1 can be performed with a simple configuration. .

<Second Embodiment>
FIG. 9 is a perspective view showing a second embodiment of the display device according to the present invention.

  As shown in the figure, in this embodiment, the light guide plate is sandwiched between the image display surface side of the light guide plate 1 and the back surface side of the substrate 21 by a plurality of spring clips 23a and 23b. 1 and the substrate 21 are fixedly positioned. The spring clips 23a and 23b are formed of iron, steel, or the like, and firmly sandwich the light guide plate 1 and the substrate 21 by elasticity. Further, the number of the spring clips 23a, 23b may be any number as long as the light guide plate 1 and the substrate 21 are not misaligned so that the positioning and fixing can be sufficiently secured, and about 3 to 5 on the end face of one display device. preferable.

  Thus, according to the second embodiment, positioning and fixing between the light guide plate 1 and the LED elements 4a, 4b, 4c,... Constituting the light source 4 can be performed with a simple configuration. . Further, at the time of maintenance or the like, the parts can be easily inspected or replaced by removing the spring clips 23a and 23b.

<Other embodiments>
In the first embodiment, the end 1d of the light guide plate 1 is placed on the substrate 21 with the end face 1b of the light guide plate 1 being abutted against the LED elements 4a, 4b, 4c,. 1 and the substrate 21 are positioned and fixed by adhesives 22a, 22b,... On the back surface side of the end 1d. However, conversely, as shown in FIG. 10, the substrate 21 is mounted on the end 1d of the light guide plate 1 with the end surface 1b of the light guide plate 1 being abutted against the LED elements 4a, 4b, 4c,. The light guide plate 1 and the substrate 21 may be positioned and fixed by adhesives 22a, 22b,.

  Also in the second embodiment, the end 1d of the light guide plate 1 is placed on the substrate 21 with the end face 1b of the light guide plate 1 being abutted against the LED elements 4a, 4b, 4c,. The spring clips 23 a and 23 b are sandwiched between the image display surface side of the light guide plate 1 and the back surface side of the substrate 21 so as to cover the end 1 d. However, conversely, as shown in FIG. 11, the substrate 21 is placed on the end 1d of the light guide plate 1 with the end face 1b of the light guide plate 1 being abutted against the LED elements 4a, 4b, 4c,. It is also possible to use a structure in which the spring clips 23a and 23b are sandwiched between the light guide plate 1 and the substrate 21 so as to cover the end 1d.

1 is a perspective view schematically showing a display device according to the present invention. It is sectional drawing of the display apparatus shown in FIG. It is a principal part expanded sectional view of the display apparatus shown in FIG. It is a top view of the dot-shaped reflection part of the display apparatus shown in FIG. It is process drawing which shows the manufacturing method of the display apparatus shown in FIG. It is process drawing following a previous figure. It is process drawing following a previous figure. 1 is a perspective view schematically showing a first embodiment of a display device according to the present invention. It is a perspective view which shows typically 2nd Embodiment of the display apparatus which concerns on this invention. It is a front view which shows typically other embodiment of the display apparatus which concerns on this invention. It is a front view which shows typically other embodiment of the display apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light guide plate 1a End surface 1b Surface (image display surface)
1c Back surface 1d End 2 Dot-shaped reflection (recess)
2a Reflecting surface 3 Display section (image display surface)
4 Light source 4a, 4b, 4c LED element 10 Display device 21 Substrate 22a, 22b Adhesive 23a, 23b Spring clip

Claims (4)

  1. A transparent light guide plate,
    A side-emitting type light emitting element provided along the end face of the light guide plate and serving as a light source;
    A plurality of concave portions provided on the light guide plate and having a reflection surface for reflecting light from the light emitting element incident from an end surface of the light guide plate to the image display surface side of the light guide plate;
    A substrate on which the light emitting element is placed,
    The end portion of the light guide plate is overlapped with the substrate in a state where the end surface of the light guide plate is abutted against the light emitting element.
    A display device characterized by that.
  2. The display device according to claim 1,
    A display device, wherein an adhesive is interposed on a surface where the end portion of the light guide plate and the substrate overlap each other.
  3. The display device according to claim 2,
    The display device, wherein the adhesive is made of a material having a refractive index lower than that of the light guide plate.
  4. The display device according to claim 1,
    A display device, wherein the light guide plate and the substrate are positioned and fixed by a spring clip sandwiched between the light guide plate and the back side of the substrate so as to cover an end portion.
JP2007119864A 2007-04-27 2007-04-27 Display device Pending JP2008277157A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007119864A JP2008277157A (en) 2007-04-27 2007-04-27 Display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007119864A JP2008277157A (en) 2007-04-27 2007-04-27 Display device

Publications (1)

Publication Number Publication Date
JP2008277157A true JP2008277157A (en) 2008-11-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007119864A Pending JP2008277157A (en) 2007-04-27 2007-04-27 Display device

Country Status (1)

Country Link
JP (1) JP2008277157A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010181756A (en) * 2009-02-09 2010-08-19 Casio Computer Co Ltd Keyboard apparatus
JP2010217418A (en) * 2009-03-16 2010-09-30 Ricoh Co Ltd Light irradiation device, image reading apparatus and image forming apparatus
JP2011128506A (en) * 2009-12-21 2011-06-30 Casio Computer Co Ltd Keyboard device
JP2015132831A (en) * 2015-02-17 2015-07-23 株式会社リコー Image reading device, and image forming apparatus
JP2015148803A (en) * 2015-02-17 2015-08-20 株式会社リコー Image reader and image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010181756A (en) * 2009-02-09 2010-08-19 Casio Computer Co Ltd Keyboard apparatus
JP2010217418A (en) * 2009-03-16 2010-09-30 Ricoh Co Ltd Light irradiation device, image reading apparatus and image forming apparatus
JP2011128506A (en) * 2009-12-21 2011-06-30 Casio Computer Co Ltd Keyboard device
JP2015132831A (en) * 2015-02-17 2015-07-23 株式会社リコー Image reading device, and image forming apparatus
JP2015148803A (en) * 2015-02-17 2015-08-20 株式会社リコー Image reader and image forming apparatus

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