JP2012199018A - Illumination device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device that can position a light guide means in a case body with improved stability.SOLUTION: The illumination device includes a lighting means 6 comprising a plurality of lighting elements, a light guide body 4 which guides illumination light emitted from the lighting means 6 to an illumination member, and a case body 5 in which the light guide body 4 is housed. The light guide body 4 has a first light guide body 4a and a second light guide body 4b, the lighting means 6 has a first lighting element 6a which corresponds to the first light guide body 4a, and a second lighting element 6b which corresponds to the second light guide body 4b, and also the light guide body 4 has a connecting part 41 to connect the first light guide body 4a and the second light guide body 4b. The light guide body 4 is supported by the case body 5 by a positioning part 43, the case body 5 has an engaging part 53 to engage with the light guide means, and the positioning part 43 is engaged with a positioning hole 52 provided in the case body 5.

Description

  The present invention relates to an illumination device and a display device that illuminate a member to be illuminated with illumination light emitted from an illumination element.

  Conventionally, various pointer-type meters for illuminating a liquid crystal display panel with illumination light emitted from an illumination element such as a light emitting diode have been proposed. This pointer-type meter includes a display, a display board provided with an indicator portion located around the indicator, a pointer that points to the indicator portion, a light guide that guides the display portion and the pointer, The driving device is disposed on the back side of the display and rotates the pointer. There is also known a display device that guides light emitted from a group of illumination elements provided in a row by a light guide to illuminate a pointer, a liquid crystal display panel, and a display plate (Patent Document 2).

Japanese Patent Laid-Open No. 2006-118892 JP 2009-31119 A

  However, the display device has a structure in which the light guide is placed on the case body and has good assemblability, but lacks stability because it is not fixed by hook engagement or the like. Moreover, it is necessary to provide an engaging part and an engaged part in the case body and the light guide member, and there is room for improvement in space saving.

The present invention comprises an illuminating means comprising a plurality of illuminating elements, a light guiding means for guiding illumination light emitted from the illuminating means to an illuminated member, and a case body in which the light guiding means is accommodated.
The light guide means has a first light guide and a second light guide,
The illumination means has a first illumination element corresponding to the first light guide and a second illumination element corresponding to the second light guide,
The light guide means is a lighting device having a connecting portion for connecting the first light guide and the second light guide,
The light guiding means is held in the case body by a protrusion,
The case body has an engaging portion that engages with the light guide means,
The protrusion is fitted into a fitting hole provided in the case body.

  In the present invention, the connecting portion has a U-shaped or U-shaped bent portion.

  In the present invention, the case body includes a light shielding wall that partitions the first light guide and the second light guide.

In addition, the present invention provides a liquid crystal display panel, a display plate, an illuminating unit including a plurality of illumination elements that illuminate the liquid crystal display panel and the display plate, and illumination light emitted from the illuminating unit to an illuminated member. A light guide means for guiding, and a case body in which the light guide means is housed,
The light guiding means is held in the case body by a protrusion,
The light guide means has a first light guide and a second light guide,
The illumination means has a first illumination element corresponding to the first light guide and a second illumination element corresponding to the second light guide,
The light guide means is a display device having a connecting portion for connecting the first light guide and the second light guide,
The light guiding means is held in the case body by a protrusion,
The case body has an engaging portion that engages with the light guide means,
The protrusion is fitted into a fitting hole provided in the case body.

  Since the light guide means can be positioned on the case body, an illumination device and a display device with improved stability can be provided.

The front view which shows embodiment of this invention. The perspective view which shows embodiment same as the above. AA sectional drawing which shows embodiment same as the above. BB sectional drawing which shows embodiment same as the above. CC sectional drawing which shows embodiment same as the above. The perspective view of a light guide member and a case body. The figure which shows the positioning part of a light guide member. The front view of the case body which shows embodiment same as the above.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The display device includes a display panel (illuminated member) 1, a cover body 2, a liquid crystal display panel (illuminated member) 3, a light guide body 4 including first and second light guide bodies 4a and 4b, It is mainly comprised from the case body 5, the illumination element 6 which consists of 1st, 2nd illumination element 6a, 6b, and the circuit board 7. FIG.

  The display board 1 is a transparent resin on which numbers and scales that serve as the indicator portions 1a are printed. The display board 1 is disposed on the front surface (display surface side) of the second light guide 4b and is irradiated from the second light guide 4b. The transmitted light is transmitted and the indicator portion 1a shines.

  The cover body 2 is made of a white synthetic resin, is fitted to the case body 5, and fixes the display panel 1, the first and second light guide bodies 4 a and 4 b to the case body 5. The cover body 2 has a convex portion (light-shielding portion) 21 located in a concave portion formed by a U-shaped connecting portion 41 described later. Of the light entering from the first and second light guides 4a and 4b, light that interferes with each other between the first and second light guides 4a and 4b by the convex portion 21 of the cover body 2 (connection) Light that does not pass through the portion 41) can be blocked, and the occurrence of uneven brightness and uneven color can be suppressed.

  The liquid crystal display panel 3 is a liquid crystal display element such as STN (Super Twisted Nematic) or TN (Twisted Nematic), and is disposed in front of the first light guide 5 and includes various information (outside temperature information, travel distance information). , Fuel consumption information, navigation information, etc.). A flexible wiring board 31 is connected to the liquid crystal display panel 3. The light diffusion sheet 32 is made of a thin plate-like translucent resin, and is disposed on the rear surface of the liquid crystal display panel 3 to diffuse the light emitted from the first light guide 4a and to reduce illumination unevenness.

  The first light guide 4a guides light emitted from the first illumination element 6a toward the liquid crystal display panel 3, and illuminates the liquid crystal display panel 3. Fine grooves or dots are formed on the rear surface (back surface) of the first light guide 4 a, so that light can be guided without illumination unevenness toward the liquid crystal display panel 3.

  The second light guide 4b guides the light emitted from the second illumination element 6b toward the display board 1 and illuminates the display board 1 by transmission. Fine grooves, dots, or the like are formed on the back surface of the second light guide 4 b, and light guiding without uneven illumination is possible toward the display panel 1.

  As shown in FIG. 6, a gap 42 is formed between the first light guide 4 a and the second light guide 4 b, and the first and second light guides are formed by the gap 42. The light guide paths to 4a and 4b are divided, the mutual interference is suppressed, and the light emitted from the first and second illumination elements 6a and 6b is guided to the liquid crystal display panel 3 and the display plate 1, respectively. It is possible to do.

  The 1st light guide 4a and the 2nd light guide 4b are connected by the connection part 41, and are united. The surface of the connection part 41 is a rough surface. The connecting portion 41 has a U-shaped bent portion 411, and the bent portion 411 has a branch portion 412. By providing the branch portion 412 in the bent portion 411, the light guide path in the bent portion 411 is branched, thereby reducing the ingress of light to the light guides 4a and 4b causing uneven brightness or color unevenness. Can do.

  Further, three positioning portions 43 to be inserted into positioning holes 52 formed in the case body 5 to be described later are projected and formed in the connecting portion 41 and the gap portion 42, and the positioning portions 43 and the positioning holes 52 are fitted together. Thus, the light guide 4 is held by the case body 5.

The case body 5 is made of a white resin and holds the first and second light guide bodies 4a and 4b, the circuit board 7, and the like. The case body 5 is disposed behind the first and second light guides 4a and 4b, and increases the light guide efficiency by reflecting light leakage from the first and second light guides 4a and 4b. Let Since the light shielding wall is integrally formed in the case body 5 so as to partition the first and second light guides 4a and 4b, the first and second illumination elements 6a and 6b do not mix colors. Each can be illuminated.

  Further, the case body 5 is integrally formed with an engaging portion 53 formed of a hook for engaging with the connecting portion 41 at a location corresponding to the connecting portion 41, so that the case body 5 has an engaged portion. The light guide body 4 can be engaged with the case body 5 without providing.

The circuit board 7 is made of a material having high thermal conductivity such as aluminum, and is electrically connected to the first and second lighting elements 6a and 6b, and supplies power to the first and second lighting elements 6a and 6b. .

  The first lighting element 6a is formed of a chip-type light emitting diode, and is arranged so that light can be supplied from the end face 44 of the first light guide 4a to the inside of the first light guide 4a. The first illumination element 6a emits light by the electric power supplied from the circuit board 7 and illuminates the liquid crystal display panel 3 through the first light guide 4a.

  The second illumination element 6b is composed of a chip-type light emitting diode, and is arranged so that light can be supplied from the end face 45 of the second light guide 4b to the inside of the second light guide 4b. The second illumination element 6b emits light by the power supplied from the circuit board 7 and illuminates the display panel 1 through the second light guide 4b.

  The first illumination element 6a and the second illumination element 6b are mounted on the circuit board 7 and arranged in a row. The first and second lighting elements 6a and 6b can dimm the brightness independently or change the emission color, respectively. The second lighting element 6b includes the first lighting element 6a and the second lighting element 6a. Emit different brightness or different colors.

Like this embodiment, the illumination means 6 which consists of a some illumination element, the light guide 4 which guides the illumination light emitted from the illumination means 6 to a to-be-illuminated member, and the case body 5 in which the light guide 4 is accommodated And
The light guide 4 has a first light guide 4a and a second light guide 4b,
The illumination means 6 has a first illumination element 6a corresponding to the first light guide 4a and a second illumination element 6b corresponding to the second light guide 4b.
The light guide 4 is a lighting device having a connecting portion 41 that connects the first light guide 4a and the second light guide 4b,
The light guide 4 is held by the case body 5 by the positioning portion 43,
The case body 5 has an engaging portion 53 that engages with the light guide means,
Since the positioning portion 43 can be positioned in the case body 5 by being fitted in the positioning hole 52 provided in the case body 5, a display device with improved stability is provided. Can do.

  In addition, this invention is not limited to each embodiment, A various deformation | transformation is possible, for example, although the connection part 41 was U shape, a U shape may be sufficient.

DESCRIPTION OF SYMBOLS 1 Display board 1a Indicator | index part 2 Cover body 3 Liquid crystal display panel
4 Light guide (light guide means)
4a First light guide 4b Second light guide 5 Case body 6 Illuminating element (illuminating means)
6a 1st illumination element 6b 2nd illumination element 7 Circuit board 31 Flexible wiring board 41 Connection part 42 Space | gap part 43 Positioning part (projection part)
51 Shading wall 52 Positioning hole (fitting hole)
53 engaging part

Claims (4)

Illuminating means comprising a plurality of illumination elements, light guide means for guiding illumination light emitted from the illumination means to an illuminated member, and a case body in which the light guide means is housed,
The light guide means has a first light guide and a second light guide,
The illumination means has a first illumination element corresponding to the first light guide and a second illumination element corresponding to the second light guide,
The light guide means is a lighting device having a connecting portion for connecting the first light guide and the second light guide,
The light guiding means is held in the case body by a protrusion,
The case body has an engaging portion that engages with the light guide means,
The projection device is fitted in a fitting hole provided in the case body.   The lighting device according to claim 1, wherein the connecting portion has a U-shaped or U-shaped bent portion.   The lighting device according to claim 1, wherein the case body includes a light shielding wall that partitions the first light guide and the second light guide. A liquid crystal display panel; a display panel; an illuminating unit comprising a plurality of illumination elements that illuminate the liquid crystal display panel and the display panel; a light guiding unit that guides illumination light emitted from the illuminating unit to an illuminated member; A case body in which the light guide means is housed, and the light guide means includes a first light guide and a second light guide,
The illumination means has a first illumination element corresponding to the first light guide and a second illumination element corresponding to the second light guide,
The light guide means is a display device having a connecting portion for connecting the first light guide and the second light guide,
The light guiding means is held in the case body by a protrusion,
The case body has an engaging portion that engages with the light guide means,
The display device, wherein the protrusion is fitted into a fitting hole provided in the case body.

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