JP4234131B2 - Illumination device and liquid crystal display device - Google Patents

Description

  The present invention relates to a lighting device used for display such as an AV device and an advertisement display device, and particularly relates to a lighting device used as a light source of a liquid crystal display device.

  2. Description of the Related Art Conventionally, in information terminal devices and the like that place importance on portability, such as notebook personal computers and notebook word processors, a sidelight system is often used as an illumination device for a transmissive or transflective liquid crystal display device.

  As shown in FIG. 7, the general structure of this sidelight system is such that at least a linear light source 26, a highly reflective sheet such as a silver vapor deposited film obtained by vapor-depositing silver and aluminum on a polyethylene terephthalate film, a highly reflective plastic, etc. Made of a light-transmitting member such as a lens, a lens 34 made of a fine prism sheet or the like using one or two polycarbonates, and having a wedge shape, a flat plate shape, etc. Incident light guide plate 32, diffuser plate 33 made of polyethylene terephthalate, etc., diffuse reflection layer 39 on which pattern formation with special ink and formation of unevenness by embossing, etc., white polyethylene terephthalate sheet, white coated metal plate, etc. It has the reflecting plate 35 which consists of these.

  A linear light source 26 is disposed in the vicinity of at least one side end of the light guide plate 32, a diffusion plate 33 is disposed on one side surface of the light guide plate 32, and a diffuse reflection layer 39 is formed on the other surface. A reflective plate 35 and a reflective layer 40 are provided on the lower side of the light guide plate 32 and on the non-emitting side of the linear light source 26. Between the linear light source 26 and the light guide plate 32, between the light guide plate 32 and the reflecting plate 35, between the linear light source 26 and the reflector 38 covering it, between the lens 34 and the diffusion plate 33, and the diffusion plate 33. The light guide plates 32 are separated from each other by an air layer 41. The light guide plate 32 and the reflection plate 35, the lens 34 and the diffusion plate 33, and the diffusion plate 33 and the light guide plate 32 are fixed by double-sided adhesive tape 42 or ultrasonic welding, respectively.

  As shown in FIG. 8, assembling the lighting device, the harness 29 is incorporated into a harness fixing groove 27 provided adjacent to the linear light source 26 in the lower frame 22, and as shown in FIG. The device constituent member is sandwiched between the upper frame 21 and the lower frame 22 and covered with the housing 25 together with the liquid crystal display panel 24 and fixed with screws 43, or the lighting device constituent member is sandwiched between the upper frame 21 and the lower frame 22, After fixing with screws (not shown), it is covered with a casing 25 together with the liquid crystal display panel 24 and fixed with screws 43. At this time, as a countermeasure against light leakage from the lighting device, as shown in FIG. 10, a light shielding body 44 made of a black adhesive material is pasted on a portion of the diffusion plate 33 in contact with the non-display area of the liquid crystal display panel 24. The light leakage from the edges of the four sides on the exit surface side of the lighting device is prevented.

  When each lighting device member such as a lens, a diffuser plate, a light guide plate, and a reflecting plate is sandwiched between an upper frame and a lower frame and covered with a housing together with a liquid crystal display panel, it takes time to position each lighting device member and maintenance. It has become difficult.

  On the other hand, if each lighting device member such as a lens, diffuser plate, light guide plate, reflector, etc. is sandwiched between an upper frame and a lower frame and fixed with screws, then it is covered with a housing with a liquid crystal display panel and fixed with screws. The cost is high.

  Furthermore, when the harness is assembled in the groove provided in the lower frame so as to be adjacent to the linear light source, the linear light source and the groove for incorporating the harness are too close, so that the linear light source is pressed and broken. There is a possibility.

  Also, light leakage from the non-display area at the edge of the lighting device has been dealt with by adhering a black adhesive material to the diffuser plate to absorb the light, but it can be applied with high accuracy. It is difficult, and the quality of the lighting device is deteriorated because the adhesive material protrudes from the display area or the adhesive material adheres to the diffusion plate in the display area.

  Furthermore, when a lens, a diffuser plate, a light guide plate, and a reflector plate are attached and fixed in order, a double-sided adhesive tape or ultrasonic welding was used, but when using an adhesive such as a double-sided adhesive tape The thickness of the lighting device increases and the cost increases. In ultrasonic welding, the thickness of the lighting device can be reduced, but the cost is further increased.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an illumination device that is low in cost and excellent in maintainability.

In order to achieve the above-described object, an illumination device according to claim 1 of the present invention is an illumination device including at least a frame and a linear light source having wiring, and the frame includes an upper frame and a lower frame. A protrusion that covers the linear light source and that is provided so that the upper frame and the lower frame are positioned at an outer peripheral end of the upper frame and in the vicinity of the linear light source. The linear light source has a reflective property and a light shielding property, and the surface on the arrangement side of the linear light source is in the longitudinal direction of the linear light source. A recess having a shape that follows a shape of a vertical cross section, and a groove for fixing the wiring is located near the outer peripheral end of the upper frame , on the side opposite to the arrangement side of the linear light source. before in the face Has a projection and a position facing, between the linear light source and the concave portion, a gap such as the pressing force is not cracked at stake is characterized by being only set to the linear light source.

The illumination device according to claim 2 is characterized in that the frame has a stopper for fixing the wiring inserted in the groove .

According to a third aspect of the present invention, there is provided a lighting device comprising any one of the above lighting devices and a liquid crystal display panel laminated .

According to the present invention, since the frame serves as a cover, a pressing force is applied to the light source when the wiring is fixed to the frame, and the light source is not broken.

  Moreover, since each hole of the said reflecting plate, the said light-guide plate, and the said upper frame is circular and an ellipse, it positions by a circular hole and deformation | transformation of each member, such as thermal expansion, is carried out by an elliptical hole. It can correspond to.

  Embodiments of the present invention will be described below. First, each component will be described with reference to FIGS. The upper frame 1 has a protrusion 3 for locking with the lower frame 2. Thereby, an illuminating device can be configured without using screws, man-hours can be reduced, and maintenance can be facilitated. Further, for example, when a liquid crystal display device is configured in combination with the liquid crystal display panel 4, the liquid crystal display device is configured by a simple operation of stacking the illumination device and the liquid crystal display panel 4, covering with a housing 5 and fixing with a screw. be able to.

  Further, the upper frame 1 has a harness fixing groove 7 and a stopper 8 on a surface not in contact with the linear light source 6. As a result, there is no fine work such as fixing the harness 9 in a narrow place where the constituent members of the lighting device are complicated, the harness 9 can be fixed after the lighting device is configured, and the harness 9 is fixed. Can be simplified. Furthermore, since the upper frame 1 serves as a cover for the linear light source 6, the linear light source 6 is not broken by being pressed when the harness 9 is fixed.

  In addition, the upper frame 1 is made of a material having a high reflection characteristic obtained by mixing about 10% of titanium oxide with polycarbonate, and by making the color white, it achieves both reflectivity and light shielding properties, and is linear. The portion covering the light source 6 is shaped to follow the shape of the linear light source 6. Accordingly, light that travels upward from the linear light source 6 can be shielded by the upper frame 1 and light leakage from the non-display area can be prevented, so that it is necessary to provide a light shielding body and a reflector as in the past. Disappears. At this time, if a slight gap (not shown) of about 1 mm, for example, is provided between the linear light source 6 and the upper frame 1, the linear light source 6 is not cracked by a pressing force. .

  The lower frame 2 is formed of polycarbonate, and a recess 10 for locking with the upper frame 1 is provided at a position corresponding to the protrusion 3 and a pin for positioning and fixing each component of the lighting device 11 is provided. In order to position and fix each component of the lighting device such as the light guide plate 12, the diffusion plate 13, the lens 14, the reflection plate 15, and the heat radiating plate 16 using the pins 11, the lighting device is formed by double-sided adhesive tape or ultrasonic welding. It is not necessary to fix each of the components, and the thickness of the lighting device can be reduced and the cost can be kept low. Further, if a hole 17 is provided in the upper frame 1 so that it can be positioned by the pin 11, it is used for positioning when the upper frame 1 and the lower frame 2 are locked and fixed by the projection 3 and the recess 10. Work time can be reduced.

  The light guide plate 12 is formed by injection molding using acrylic resin, and has a wedge shape with an incident end face thickness of 3.3 mm and an anti-incident end face thickness of 1.2 mm. A hole 17 is provided for positioning and fixing by the pin 11 of the frame 2. Further, a white dot pattern as a diffuse reflection layer is formed on the lower side by printing.

  D118 (manufactured by Enomoto Electric Co., Ltd.) is used for the diffuser plate 13, lens sheet BEF (manufactured by Sumitomo 3M) is used for the lens 14, white polyethylene terephthalate sheet E-60 (manufactured by Toray) is used for the reflector plate 15, and thermal conductivity is used for the heat radiating plate 16. Each of the excellent aluminum is used. Each of these members is provided with a hole 17 for positioning and fixing the pin 11 of the lower frame 2 at each end.

  The holes 17 for positioning and fixing with the pins 11 of the lower frame 2 are formed in a circular shape by mixing the shape of the holes with each member in a circular shape and an elliptical shape so that each member can cope with the deformation of each member due to heat. Positioning is performed by the hole, and the elliptical hole can cope with deformation of each member such as thermal expansion.

  The linear light source 6 has an outer diameter of 2.6 mm and is disposed so that an air layer is interposed between the linear light source 6 and the end face of the light guide plate 12.

  Next, assembly of the lighting device will be described. The linear light source 6 is arranged by positioning the holes 11 in the pins 11 of the lower frame 2 by inserting the holes 17 in the order of the heat radiation plate 16, the reflection plate 15, the light guide plate 12, the diffusion plate 13, and the lens 14. Then, the hole 17 of the upper frame 1 is positioned by being fitted into the pin 11 of the lower frame 2 and is fixed by being locked by the protrusion 3 of the upper frame 1 and the recess 10 of the lower frame 2. Thereafter, the harness 9 of the linear light source 6 is inserted into the harness fixing groove 7 of the upper frame 1 and fixed with the stopper 8.

  A liquid crystal display panel 4 is laminated on the lighting device thus obtained, covered with a casing 5 and fixed with screws, thereby obtaining a liquid crystal display device.

  According to the present embodiment, since the upper frame and the lower frame are locked by the protrusion and the recess, the lighting device can be configured without using screws, and the number of man-hours can be reduced. Maintenance can be facilitated. Furthermore, for example, when a liquid crystal display device is configured in combination with a liquid crystal display panel, the liquid crystal display device can be configured with a simple operation.

  Further, since the upper frame has the harness fixing groove and the stopper on the surface not in contact with the linear light source, the work of fixing the harness can be simplified. Furthermore, since the upper frame serves as a cover for the linear light source, the linear light source is not pressed and broken when the harness is fixed.

  In addition, the upper frame is made of a material that shows high reflection characteristics by mixing about 10% of titanium oxide with polycarbonate, and by making the color white, it achieves both reflectivity and light shielding properties. Since the portion covering the light source has a shape that follows the shape of the linear light source, it is not necessary to provide a light shielding body and a reflector.

  Further, a pin is provided on at least one of the upper frame and the lower frame, and holes are provided in at least one of the upper frame and the lower frame, the diffusion plate, the light guide plate, the reflection plate, and the lens, Each component is positioned and fixed by the pin and the hole.

  Thus, since the pin for positioning and fixing each component of the lighting device is provided, it is not necessary to fix each component of the lighting device by double-sided adhesive tape or ultrasonic welding. The thickness can be reduced and the cost can be kept low. Further, if a hole is provided in the upper frame so that it can be positioned by this pin, it can be used for positioning when the upper frame and the lower frame are locked and fixed by the projection and the recess, and the work time is increased. Can be shortened.

It is a perspective view which shows the illuminating device concerning this invention. It is a perspective view which shows the upper frame of the illuminating device concerning this invention. It is a perspective view which shows the lower frame of the illuminating device concerning this invention. It is a perspective view which shows the fixing method of the harness of the illuminating device concerning this invention. It is a perspective view which shows the structure of the liquid crystal display device using the illuminating device concerning this invention. It is sectional drawing which shows the structure of the liquid crystal display device using the illuminating device concerning this invention. It is sectional drawing which shows the structure of the conventional illuminating device. It is a perspective view which shows the fixing method of the harness of the conventional illuminating device. It is a perspective view which shows the structure of the liquid crystal display device using the conventional illuminating device. It is a perspective view which shows the structure at the time of arrange | positioning the light-shielding body to the liquid crystal display device using the conventional illuminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper frame 2 Lower frame 3 Projection 4 Liquid crystal display panel 5 Case 6 Linear light source 7 Harness fixing groove 8 Stopper 9 Harness 10 Recess 11 Pin 12 Light guide plate 13 Diffusion plate 14 Lens 15 Reflection plate 16 Heat radiation plate 17 Hole 21 Upper frame 22 Lower frame 24 Liquid crystal display panel 25 Housing 26 Linear light source 27 Harness fixing groove 29 Harness 32 Light guide plate 33 Diffuser plate 34 Lens 35 Reflector plate 38 Reflector 39 Diffuse reflective layer 40 Reflective layer 41 Air layer 42 Double-sided adhesive Tape 43 Screw 44 Shading body

Claims (3)

In an illumination device having at least a frame and a linear light source having wiring,
The frame is
It consists of an upper frame and a lower frame,
Covering the linear light source,
A protrusion provided at the outer peripheral end of the upper frame so as to be positioned in the vicinity of the linear light source is engaged with a recess provided at the outer peripheral end of the lower frame near the linear light source. By fixing the upper frame and the lower frame,
It has reflectivity and light shielding properties, and has a concave portion whose surface on the arrangement side of the linear light source follows a shape of a cross section perpendicular to the longitudinal direction of the linear light source, and fixes the wiring A groove for the outer frame in the vicinity of the outer peripheral edge of the upper frame, at a position facing the protrusion on the surface opposite to the arrangement side of the linear light source,
Wherein between the recess and the linear light source, the lighting apparatus pressing force to the linear light sources is suffering a gap which does not crack, characterized in that are only set. The lighting device according to claim 1, wherein the upper frame has a stopper for fixing the wiring inserted in the groove. 3. A liquid crystal display device comprising the illuminating device according to claim 1 and a liquid crystal display panel laminated.

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