JP2009031564A - Display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the light from leaking from a display device and to make its assembly work easy. <P>SOLUTION: A lens bar 6 is disposed on a substrate 2 to cover LEDs arranged with spacing in line on one side of the substrate 2. The lens bar 6 has lens sections 14a in the positions matching the LEDs. A cover 20 is attached to the substrate 2 to cover the lens bar 6. The cover 20 has light transmission windows 34a in the positions matching the lens sections 14a. The lens bar 6 has an air gap 16a in each spacing between the LEDs. A light shading materials (nontransparent materials) are integrally formed intruding the air gaps 16a inside the cover 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device using a plurality of light emitting elements.

  Conventionally, as a display device using a plurality of light emitting elements, there is a display device disclosed in Patent Document 1, for example. In the technique of Patent Document 1, a plurality of LED chips are arranged in a predetermined pattern on the substrate 1, a light shielding sheet having an insertion hole corresponding to the position of each chip is arranged on the substrate, and each chip is disposed thereabove. A reflection frame having a window corresponding to the arrangement pattern is attached, and the light introduced into the window is reflected by the window and emitted to the outside.

JP-A-11-167357

  According to the above technique, since the light shielding sheet is provided, the light from each chip is introduced only into the corresponding window. As a result, light leakage can be prevented and the contrast in this display device can be increased. However, it is necessary to attach a light shielding sheet separately from the reflection frame, and the assembling efficiency is lowered. By the way, a light-shielding material cover having a window formed in the same manner as the reflection frame may be used instead of the reflection frame, and the light emitting elements may be arranged in a row. In this case, one lens array having a plurality of lens portions corresponding to each light emitting element is arranged in the cover so as to cover each light emitting element. In order to facilitate the manufacture of the lens array, the entire lens unit including the lens portion is made of a translucent material. In this case, the lens array must be provided on the light shielding sheet, and the assembly efficiency is further reduced.

  An object of the present invention is to provide a display device that prevents light leakage and is easy to assemble.

  A display device according to one embodiment of the present invention includes a plurality of light-emitting elements. These light emitting elements are arranged on one surface of the substrate at intervals in a row. These light emitting elements emit light in a direction away from one surface of the substrate. As the light emitting element, for example, an LED can be used. A lens array is disposed on the substrate so as to cover all the light emitting elements. This lens array has a lens forming portion at a position away from the substrate. The lens forming portion is disposed substantially parallel to one surface of the substrate. A lens portion is formed at a position corresponding to each light emitting element in the lens forming portion. The lens unit is for collecting light from the corresponding light emitting element, for example. The entire lens array including the lens portion is translucent. A non-transparent cover is disposed on the substrate so as to cover the lens array. This cover can be formed of, for example, a light-shielding material or a reflective material. The cover has a window forming portion that is substantially in contact with the lens forming portion, and a light transmitting window is formed at a position corresponding to each lens portion of the window forming portion. The lens array has gaps extending from the lens forming part side to the substrate side and across the array direction of the light emitting elements at each of a plurality of intervals between the light emitting elements. A plurality of non-transmissive bodies covering the gaps are integrally formed on the inner surface of the window forming portion of the cover so as not to transmit the light emitted from the adjacent light emitting elements. The non-transparent material may have a light shielding property or a light reflecting property.

  In the display device configured as described above, a part of the light emitted from the light emitting element is radiated to the outside from the corresponding transmission window via the corresponding lens unit. Also, other parts of the light, particularly those directed in the direction of the adjacent light emitting elements, are blocked or reflected by the non-transparent material. Accordingly, it is possible to prevent the light from being emitted from the lens portion or the transmission window for the adjacent light emitting element, and the contrast can be increased. In addition to the light emitting element, only the lens array and the cover are used, and it is not necessary to provide a special light shielding sheet, so that the efficiency of the assembly work is improved.

  Each of the gaps can be formed up to the vicinity of each of the light emitting elements. In this case, each of the non-transmissive bodies penetrates to the vicinity of the light emitting element of each of the gaps. If comprised in this way, the light which goes to the adjacent light emitting element side among the light from a light emitting element can be made non-transmissive | permitted reliably, and the contrast of a display apparatus can be enlarged more.

  Alternatively, the gap may be formed through the lens forming body in a direction crossing the arrangement direction of the light emitting elements. In this case, the cover has side walls from the both sides of the window forming portion in the direction crossing the arrangement direction to the substrate side, and the non-transparent bodies are integrally formed on the side wall and the window forming portion. Has been. If comprised in this way, since all the light which goes to the whole direction crossing the arrangement direction of a light emitting element is made non-transmissive by a non-transmissive body, the contrast of a display apparatus can be enlarged reliably.

  As described above, the display device according to the present invention can be easily assembled by reducing the number of components while preventing light leakage.

  A display device according to an embodiment of the present invention is, for example, a level indicator in which the present invention is implemented. As shown in FIG. 2, a plurality of, for example, seven light emitting elements, for example, LEDs 4 a and 4 b, Are arranged in a line at regular intervals. The six LEDs 4a are arranged at the same interval, and only one LED 4b at the end is arranged at a wider interval than the interval between the other LEDs 4a. Six LEDs 4a are used as level indicators, and the remaining LED 4b is used as a pilot lamp. These LEDs 4 a and 4 b emit visible light to the side opposite to the substrate 2. These LEDs 4a and 4b are attached to the printed circuit board 2 by surface mounting technology.

  A lens array, for example, a lens bar 6 is attached on the printed circuit board 2 so as to cover the entire LEDs 4a and 4b. The lens bar 6 has a plate-like single lens forming portion 8 substantially parallel to the printed circuit board 2 with an interval corresponding to each LED 4a, 4b. As shown in FIG. 3C, single side walls 10 and 10 are respectively formed at both ends of the single lens forming portion 8 in the direction crossing the arrangement direction of the LEDs 4a and 4b. These single side walls 10 and 10 are in contact with the printed circuit board 2 at their ends. A plurality of U-shaped members 12 are formed by the single lens forming portion 8 and the single side walls 10 and 10. Lens portions 14a and 14b are provided on the surface of each U-shaped member 12 opposite to the printed circuit board 2 of the single lens forming portion 8 so as to correspond to the LEDs 4a and 4b. The lens portion 14a is generally rectangular, but the lens portion 14b is cylindrical. Each lens part 14a and 14b converges and radiates | emits the light which injected into these. The lens bar 6 is entirely formed of a translucent resin, for example, a transparent resin.

  In each U-shaped member 12, gaps 16a and 16b are formed between the U-shaped members 12 so as to correspond to the gaps existing between the LEDs 4a and 4b. These gaps 16a and 16b are formed substantially linearly from the single lens forming portion 8 to the vicinity of the heads of the LEDs 4a and 4b as shown in FIGS. 2 and 3 (b), and as shown in FIG. 3 (a). Are formed so as to penetrate in a direction crossing the arrangement direction of the LEDs 4a and 4b, for example, orthogonal to the arrangement direction of the LEDs 4a and 4b. As shown in FIGS. 3B and 3C, these U-shaped members 12 are connected to each other by a connecting portion 18 located below the gaps 16a and 16b. The length of the gap 16b in the arrangement direction of the LEDs 4a and 4b is longer than the length of the gap 16a in the arrangement direction of the LEDs 4a and 4b.

  The lens bar 6 has a U-shaped surface along the arrangement direction of the LEDs 4a and 4b, has a long lens forming part on all the LEDs 4a and 4b, and each LED 4a and 4b of the long lens forming part. The long side walls are formed so that the tips are in contact with the substrate 2 from both ends in the direction orthogonal to the arrangement direction of the LED, and the long lens is formed on the printed circuit board 2 side at each position corresponding to the gap between the LEDs 4a and 4b. It is the shape which notched the formation part and the elongate side wall to the vicinity of each LED4a, 4b.

  As shown in FIG. 2, a cover 20 is provided on the printed circuit board 2 so as to cover the lens bar 6. The cover 20 is made of, for example, a resin having a light shielding property, and has a flat window formation 22 whose inner surface is substantially in contact with each lens portion of the lens bar 6. Side walls 24 and 24 are formed from both side edges in the arrangement direction of the LEDs 4a and 4b in the window forming portion 22, that is, from both long edges toward the printed circuit board 2 as shown in FIG. The ends of the side walls 24, 24 on the printed circuit board 2 side are in contact with the printed circuit board 2. As shown in FIG. 1, end walls 26 and 26 are formed at both ends of the windows 4 in the arrangement direction of the LEDs 4a and 4b, respectively. An end of the end wall 26 on the printed board 2 side is in contact with the printed board 2.

  As a result, the end portion of the cover 20 on the printed circuit board 2 side forms a rectangular opening, and is positioned at both ends of one diagonal line of the opening 2 as shown in FIGS. 4 (b) and 4 (c). Two small protrusions 28 are formed. The cover 20 is attached to the printed circuit board 2 by inserting the small protrusions 28 and 28 through small holes (not shown) formed in the printed circuit board 2. On the side walls 24, 24 of the cover 20, one engaging portion 30, 30 is formed by cutting out from the printed circuit board 2 side, and the front end faces the cover 20 side as shown in FIG. 4 (b). A nail 32 is formed. The claws 32 engage with the recesses 33 of the predetermined side walls 10 and 10 of the lens bar 6 to attach the lens bar 6 to the cover 20.

  Translucent windows 34a, 34b are formed in one row at positions corresponding to the lens portions 14a, 14b in the window forming portion 22. The light transmitting window 34a has a rectangular shape corresponding to the lens portion 14a, and the light transmitting window 34b has a circular shape corresponding to the lens portion 14b. As shown in FIG. 4B, the lens portions 14a and 14b are inserted into the light transmitting windows 34a and 34b, respectively, and the light focused by the lens portions 14a and 14b is emitted to the outside.

  On the inner surface of the cover 20, a plurality of non-transmissive bodies, for example, light shielding bodies 36 are integrally formed of the same light shielding material as the cover 20. Each light shield 36 is formed integrally with the window forming part 22 and the side walls 24, 24 at positions corresponding to the gaps 16 a, 16 b of the lens part 6. These light shields 36 extend to the vicinity of the coupling portion 18 of the lens bar 6 and completely cover the gaps 16a and 16b on the plane perpendicular to the arrangement direction of the LEDs 4a and 4b. positioned. The gap 16a is in contact with the adjacent U-shaped member 10 in the direction along the arrangement direction of the LEDs 4a and 4b. By forming these light shields 36, the inside of the cover 20 is partitioned into a plurality of rooms corresponding to the LEDs 4a and 4b.

  In the display device configured as described above, for example, after the LEDs 4a and 4b are mounted on the printed circuit board 2 by surface mounting technology, the lens bar 6 is placed on the LEDs 4a and 4b, and the cover 20 is further attached to the lens bar 6. Cover the lens bar 6 with the engaging claw 32. Further, the cover 20 is attached to the printed circuit board 2 using the small protrusions 28. Therefore, even if the lens bar 6 is not fixed to the printed circuit board 2, the position thereof does not move.

  In this display device, when any one of the LEDs 4a and 4b emits light, for example, when one LED 4a emits light, light is emitted in a direction away from the printed board 2 as indicated by an arrow in FIG. A part of this light is collected by the lens unit 14a and is radiated to the outside from the light transmitting window 34a. Other light is shielded by the light shield 36 and the side walls 24, 24 of the cover 20, and does not reach any adjacent LED 4a side. Therefore, the light from the adjacent LED 4a that does not emit light does not reach around the LED 4a that does not emit light, and the light does not leak from the transparent window 34a corresponding to the LED 4a that does not emit light, thereby increasing the contrast. be able to. In particular, since each light shield 36 is formed up to the vicinity of the LEDs 4a and 4b, light leakage can be surely prevented.

  Moreover, in order to prevent this light leakage, it is not necessary to newly provide a light shielding sheet, and it is only necessary to attach the condensing lens bar 6 and the cover 20 on each LED 4a, 4b, so that the assembly efficiency is high. improves.

  In the above embodiment, the individual LEDs 4a and 4b are mounted on the printed circuit board 2, but an LED array in which a plurality of LEDs are pre-arranged in a line may be used. The lens bar 6 is made of a transparent resin, but can also be made of a translucent resin. The lens portions 14a and 14b are rectangular or cylindrical, but are not limited to this, and may be formed in a semi-convex lens shape, for example. In the above embodiment, the light shielding body 36 is used. However, a reflection film may be formed on the surface of the light shielding body 36 to reflect light toward the lens portions 14a and 14b.

It is an assembly drawing of the display apparatus of one Embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus of FIG. It is the top view, longitudinal cross-sectional view, and side view of a lens bar used for the display apparatus of FIG. It is the top view, longitudinal cross-sectional view, and front view of a cover used for the display apparatus of FIG.

Explanation of symbols

2 Printed circuit board 4a 4b LED (light emitting element)
6 Lens bar (lens array)
8 Lens formation part 14a, 14b Lens part 16a, 16b Space | gap 20 Cover 22 Window formation part 24 Side wall 34a, 34b Light transmission window 36 Light-shielding body (non-transmission body)

Claims (3)

A plurality of light emitting elements arranged in a row on one side of the substrate and spaced in a row and emitting light in a direction away from the one side of the substrate;
A translucent material disposed on the substrate, covering all the light emitting elements, having a lens forming portion at a position away from the substrate, and having a lens portion at a position corresponding to each light emitting element in the lens forming portion. A lens array of
Non-transparent having a window forming portion disposed on the substrate, covering the lens array, substantially in contact with the lens forming portion, and having a light transmitting window at a position corresponding to each lens portion of the window forming portion. With sex cover,
Equipped,
The lens array has gaps that run from the lens forming portion side to the substrate side and cross the array direction of the light emitting elements at each of a plurality of intervals between the light emitting elements.
A display device in which a plurality of non-transmissive bodies covering the gaps are integrally formed on an inner surface of the window forming portion of the cover so that light emitted by the adjacent light emitting elements is not transmitted.   2. The display device according to claim 1, wherein each of the gaps is formed to the vicinity of each of the light emitting elements, and each of the non-transparent bodies has penetrated to the vicinity of the light emitting elements of each of the gaps.   The display device according to claim 1, wherein the gap is formed so as to penetrate the lens forming body in a direction crossing the arrangement direction of the light emitting elements, and the cover is arranged in a direction crossing the arrangement direction in the window forming portion. A display device having side walls from both sides toward the substrate, wherein each non-transmissive body is formed integrally with the side walls and the window forming portion.

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