JP2005174796A - Luminous body package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitter package capable of emitting light with stable luminance.
A backlight 2 including an LED module 20 and a light guide plate 30 is housed in a frame 1. A portion of the frame 1 that faces the LED module 20 is provided with a spring member 1c that presses the LED module 20 to bring the LED module 20 and the light guide plate 30 into close contact with each other.
[Selection] Figure 1

Description

  The present invention relates to a light emitter package.

  A backlight used in a liquid crystal display device is composed of, for example, an LED (Light Emitting Diode) module that is a light source, and a light guide plate that guides light emitted from the LED module and emits the light in a predetermined direction (for example, , See Patent Document 1).

  Each component (frame, light guide plate, etc.) constituting the liquid crystal display device may change in size due to a change in temperature of the usage environment. Furthermore, since the coefficient of thermal expansion depends on the material if the material is different for each part, the dimensional change due to the temperature change may be different for each part.

  For this reason, if the storage space of each part is designed in accordance with the dimensions of each part accurately, the part may not fit in the storage space due to the dimensional change described above. In addition, there is a possibility that parts may collide with each other due to dimensional changes of the parts, and the parts may be damaged or deformed.

For this reason, in the conventional liquid crystal display device, the design which considered the above-mentioned dimensional change is performed, and each component is mounted. For example, the backlight described above is mounted with a gap between the LED module and the light guide plate without causing the LED module and the light guide plate to adhere to each other.
Japanese Unexamined Patent Publication No. 2003-195302 (paragraphs 0013-0014, FIG. 2)

  However, if a gap is provided between the LED module and the light guide plate as described above, the following problem may occur.

  For example, when the dimensions of the LED module and the light guide plate change due to temperature changes in the usage environment, the positional relationship (distance) between the LED module and the light guide plate may change.

  The luminance of the light guided and emitted by the light guide plate depends on the distance between the LED module and the light guide plate. Specifically, the shorter the distance between the LED module and the light guide plate, the higher the luminance, and the longer the distance, the lower the luminance.

  For this reason, when the LED module and the light guide plate undergo dimensional changes, the luminance of the emitted light may change.

  In addition, when a gap is provided between the LED module and the light guide plate, the distance between the LED module and the light guide plate may change due to vibration applied from the outside. Also in this case, the luminance of the emitted light may change as described above.

  Furthermore, the positional change as described above is not constant between the liquid crystal display devices. For this reason, there is a possibility that the problem that the luminance of the emitted light differs for each liquid crystal display device may occur.

  Accordingly, an object of the present invention is to provide a light emitter package capable of emitting light with stable luminance.

  In order to achieve the above object, a light emitter package according to the present invention is a light emitter package that can store a light source that emits light and a light guide plate that guides light emitted from the light source and emits the light in a predetermined direction. A frame including pressing means for pressing at least one of the light source and the light guide plate into a portion in which at least one of the light source and the light guide plate is accommodated, thereby bringing the light source and the light guide plate into close contact with each other; It is characterized by having.

  According to this invention, the brightness | luminance of the light radiate | emitted from a light-guide plate can be stabilized.

  The light source may have a light emitting surface from which light is emitted, the light guide plate may have a light incident surface on which light irradiated by the light source is incident, and the pressing means includes the light source and The light emitting surface and the light incident surface may be brought into close contact with each other by pressing at least one of the light guide plates.

  The pressing means may be made of an elastic material and may press at least one of the light source and the light guide plate by its own elastic force.

  The pressing means may be formed as a part of the frame when the frame is formed.

A plurality of the light sources may be provided, and the same number of the pressing means as the light sources may be provided.
The light source and the light guide plate are accommodated by the pressing means,
A configuration in which a display medium that displays light emitted from the light guide plate is provided at a position facing the light emission surface of the light guide plate is preferable. As the display medium, a liquid crystal display element or an electrochromic display is used. An element, electronic paper, etc. are preferable.

  The luminance of the emitted light can be stabilized by the light emitting package of the present invention.

  Next, a liquid crystal display device including a light emitting package according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A is a plan view showing a configuration of a liquid crystal display device according to an embodiment of the present invention, and FIG. 1B shows the liquid crystal display device of FIG. It is sectional drawing at the time of cut | disconnecting. The hatching in FIG. 1 (a) is provided to facilitate identification of each component of the liquid crystal display device.

  The liquid crystal display device according to the embodiment of the present invention includes a frame 1, a backlight 2, and a liquid crystal panel 3.

  The frame 1 is a rectangular resin frame, and the backlight 2 and the liquid crystal panel 3 are disposed in the frame 1. The frame 1 includes a transparent plate 1a formed of a resin that can transmit light (for example, acrylic resin). The space in which the backlight 2 is disposed and the space in which the liquid crystal panel 3 is disposed are separated by a transparent plate 1a.

  The liquid crystal panel 3 includes a liquid crystal layer sealed between a pair of substrates facing each other, and controls transmission / non-transmission of light emitted from the backlight 2 by applying an electric field to a predetermined portion of the liquid crystal layer. To display a predetermined image.

  The backlight 2 includes an LED module 20 including one or a plurality of LEDs (Light Emitting Diodes), and a light guide plate 30 that guides light emitted from the LED module 20 to the back side of the liquid crystal panel 3. .

  The LED module 20 is mounted on an LED cable substrate 21 as shown in FIGS. 2 (a) and 2 (b), for example. On the LED cable board 21, positive and negative connection terminals connected to a power source, cables for connecting the connection terminals and the LED module 20, and the like are installed.

  The LED module 20 is one in which one or a plurality of LEDs are covered with a resin case 22 having an exit window 22a through which light exits. In FIG. 2B, an elliptical exit window 22a is shown as an example. However, the exit window 22a may have another shape (for example, a rectangle), and a plurality of exit windows 22a are provided. May be. The surface on which the emission window 22a is provided is a light emitting surface 20a from which light is emitted.

  The light guide plate 30 is composed of an acrylic plate or the like. The light emitted from the LED module 20 propagates through the light guide plate 30 while repeating total reflection. In addition, the light guide plate 30 includes a light diffusion film (not shown), and the light propagating inside is scattered by the light diffusion film and emitted to the back side of the liquid crystal panel 3.

  A side 1b of the frame 1 facing the LED module 20 is provided with a spring member 1c formed integrally with the frame 1 by, for example, injection molding. The spring member 1c is provided to press the LED module 20 against the light guide plate 30 by using the elastic force of the resin forming the spring member 1c.

  In a state where the backlight 2 is not mounted, the distance D between the spring member 1c and the side 1d facing the side 1b is set to be shorter than the combined length of the LED module 20 and the light guide plate 30. Thus, the LED module 20 is pressed against the light guide plate 30 by the elastic force of the spring member 1c, and the light guide plate 30 is pressed against the side 1d of the frame 1 and fixed. As a result, when the LED module 20 and the light guide plate 30 are mounted, the light emitting surface 20a of the LED module 20 and the light incident surface 30a on which light from the LED module 20 included in the light guide plate 30 enters are in close contact.

  Further, since the LED module 20 and the light guide plate 30 are brought into close contact with each other by the elastic force of the spring member 1c, the LED module 20 and the light guide plate 30 are damaged even if the dimensions of each component change due to temperature changes in the use environment. The contact state can be maintained by the repulsive force of the spring member 1c. As a result, it is possible to emit light having a stable luminance from the backlight 2 regardless of temperature changes in the use environment. Further, it is not necessary to strictly consider the dimensional change of each part, and the design of the liquid crystal display device is facilitated accordingly.

  The backlight 2 housed in the frame 1 is covered with a cover plate 4 as shown in FIG. As a result, the backlight 2 is sandwiched between the transparent plate 1a and the cover plate 4, and the position of the LED module 20 is prevented from being greatly shifted in the vertical direction (the direction perpendicular to the direction in which the spring member 1c is pressed). Since the brightness of the light emitted from the backlight 2 greatly depends on the distance between the LED module 20 and the light guide plate 30, even if the LED module 20 is slightly displaced in the vertical direction, the LED module 20 and the light guide plate 30 If closely adhered, the luminance of the light emitted from the light guide plate 30 toward the liquid crystal panel 3 does not substantially change. That is, there is no luminance change that can be recognized by a person. Moreover, since the member which diffuses light is not interposed between the LED module 20 and the light guide plate 30, the light of the LED module 20 can be efficiently propagated to the light guide plate 30.

  When the backlight 2 is mounted, for example, as shown in FIG. 3A, first, the LED module 20 is accommodated in the frame 1, and the interval D between the spring member 1c and the side 1d is increased. At this time, since the spring member 1c is formed of an elastic resin, the interval D can be easily widened.

  And as shown in FIG.3 (b), the light-guide plate 30 is accommodated in the expanded space, and the spring member 1c is relieve | moderated. Thereby, as shown in FIG.3 (c), the light emission surface 20a of the LED module 20 and the light-incidence surface 30a of the light-guide plate 30 closely_contact | adhere with the elastic force of the spring member 1c, and the LED module 20 and the light-guide plate 30 are attached. It is fixed in the frame 1.

  The above mounting can be performed manually or by using a dedicated mounting apparatus.

  The shape of the spring member 1c is not limited to the above as long as the LED module 20 can be properly adhered to the light guide plate 30. For example, it may have a trapezoidal shape as shown in FIG. 4 (a), a semi-elliptical shape as shown in FIG. 4 (b), or a plate shape as shown in FIG. 4 (c). May be.

  Two or more LED modules 20 may be mounted. In this case, for example, as shown in FIG. 5, the same number of spring members 1c as the number of LED modules 20 to be mounted may be provided.

  Further, when the light guide plate 30 is fixed in the frame 1 by a fixing member (such as a screw or an adhesive), there is a gap between the light guide plate 30 and the side 1d of the frame 1 as shown in FIG. May be.

  Further, the frame 1 and the spring member 1c may be made of a metal that develops an elastic force when the thickness is about the thickness of the spring member 1c, and may be integrally formed.

  The frame 1 and the spring member 1c may be formed separately. In this case, the material of the frame 1 and the material of the spring member 1 c are not necessarily the same, but the spring member 1 c is preferably fixed to the frame 1.

  In addition to the LED module 20, a Zener diode or the like may be mounted on the LED cable substrate 21.

  In the above embodiment, the LED module 20 is pressed against the light guide plate 30 by the spring member 1c. However, the light guide plate 30 may be pressed against the LED module 20 by the spring member 1c. Specifically, the position of the LED module 20 and the position of the light guide plate 30 may be arranged opposite to the above embodiment. Also in this case, the LED module 20 and the light guide plate 30 are in close contact with each other, and light with stable luminance can be emitted from the backlight 2.

  In the above embodiment, the spring member 1c is provided only on the side 1b of the frame 1 facing the LED module 20, but a similar spring member may be provided on the side 1d of the frame 1 facing the light guide plate 30. That is, in addition to the spring member 1c that presses the LED module 20, a spring member that presses the light guide plate 30 may be provided. By doing so, the pressing force is strong, and the LED module 20 and the light guide plate 30 can be brought into close contact with each other more reliably.

  Moreover, in the said embodiment, although the case where LED module 20 provided with LED was closely_contact | adhered to the light-guide plate 30 was shown as an example, if possible, LED itself may be closely_contact | adhered to the light-guide plate 30 by the spring member 1c. It may be.

  A light source other than the LED module 20 may be used as the light source of the backlight 2. For example, an electroluminescence element or a cold cathode discharge lamp may be used.

  The present invention is applicable not only to the liquid crystal display device described above, but also to any display device that uses a backlight composed of a light source and a light guide plate.

(A) is a top view which shows the structure of the liquid crystal display device concerning embodiment of this invention, (b) is sectional drawing at the time of cut | disconnecting the liquid crystal display device of (a) by the AA 'line | wire. It is. (A) is a top view of the LED module which comprises the liquid crystal display device shown in FIG. 1, (b) is the side view. It is a figure which shows the mounting method of the backlight which comprises the liquid crystal display device shown in FIG. It is a figure which shows various shapes of the spring member with which the flame | frame which comprises the liquid crystal display device shown in FIG. It is a figure which shows the other structure of a liquid crystal display device. It is a figure which shows the other structure of a liquid crystal display device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Frame, 1a ... Transparent plate, 1b ... Side, 1c ... Spring member, 1d ... Side, 2 ... Back light, 3 ... Liquid crystal panel, 4 ... Cover plate, 20 ... LED module, 20a ... light emitting surface, 21 ... LED cable substrate, 22 ... resin case, 22a ... exit window, 30 ... light guide plate, 30a ... Incident surface

Claims (6)

A light-emitting package that can store a light source that emits light, and a light guide plate that guides light emitted from the light source and emits the light in a predetermined direction,
A frame including pressing means for closely contacting the light source and the light guide plate by pressing at least one of the light source and the light guide plate in a portion in which at least one of the light source and the light guide plate is stored;
A light emitter package characterized by the above. The light source has a light emitting surface from which light is emitted,
The light guide plate has a light incident surface on which light irradiated by the light source is incident,
The pressing means presses at least one of the light source and the light guide plate, thereby bringing the light emitting surface and the light incident surface into close contact with each other;
The light-emitting package according to claim 1.   3. The light emitter package according to claim 1, wherein the pressing unit is formed of an elastic material and presses at least one of the light source and the light guide plate by its own elastic force. 4.   The light emitting package according to any one of claims 1 to 3, wherein the pressing means is formed as a part of the frame when the frame is formed. A plurality of the light sources are provided,
The pressing means is provided in the same number as the light source,
The light emitter package according to any one of claims 1 to 4, wherein the light emitter package is provided. The light source and the light guide plate are accommodated by the pressing means,
The light emitting device according to any one of claims 1 to 5, wherein a display medium for displaying light emitted from the light guide plate is provided at a position facing the light emission surface of the light guide plate. Body package.

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