JP5040194B2 - LCD module - Google Patents

Description

  The present invention relates to a liquid crystal display module, and more specifically, when a white light source and another light source that emits light of a color other than white are provided, the characteristics of the other light source deteriorate due to heat generation of the white light source. The present invention relates to a liquid crystal display module capable of suppressing the above.

  In recent years, there are an increasing number of vehicles in which the entire instrument panel is composed of a liquid crystal display module and the liquid crystal display module displays vehicle speed information, engine hydraulic pressure information, fuel information, and the like. In such a vehicle, a white LED (Light Emitting Diode) and a red LED are used for the backlight of the liquid crystal display module. Usually, various information is displayed in color using the white LED, and the vehicle has a shortage of fuel. When displaying information important for traveling, there is a technique of switching to a red LED in order to make the user easily aware (see Patent Document 1).

JP 2004-70193 A

  In the liquid crystal display module using the white LED and the red LED, the display using the red LED is limited to a specific time, and the color display using the white LED is usually performed. For this reason, it is generally considered that the display time using the white LED is longer. Therefore, when the red LED is arranged near the white LED, the characteristics of the red LED may be deteriorated due to the heat generated by the white LED.

  An object of the present invention is to provide a liquid crystal display module capable of suppressing deterioration of characteristics of the other light source due to heat generated by the white light source when a white light source and another light source that emits light of a color other than white are provided. It is to be.

Liquid crystal display module according to the present invention includes a liquid crystal panel, the liquid crystal panel disposed opposite the light guide plate, arranged next to one end face of the light guide plate, wherein towards one end face a predetermined color light a light source which is extractable placement of, said light guide plate disposed adjacent to the one end face, the other light sources arranged so capable of emitting light of a color other than the predetermined color light toward the one end face And the light source mounting substrate on which the light source is mounted and disposed opposite to the one end surface of the light guide plate, and the light source mounting substrate are provided separately, and the other light source is mounted and the light guide is mounted. Another light source mounting substrate disposed opposite to the one end surface of the light plate, and the light source mounting substrate and the other light source mounting substrate are disposed apart from each other with a gap. It is characterized by being.

  Further, it is preferable that the white light source mounting substrate and the other light source mounting substrate have a concavo-convex shape in plan view and are arranged so as to mesh the concave and convex portions with each other.

The liquid crystal display module according to the present invention includes a liquid crystal panel, the liquid crystal panel disposed opposite the light guide plate, arranged next to one end face of the light guide plate, toward said one end face a predetermined a light source for the color light which is disposed to be emission of being positioned next to said one end face of the light guide plate, the other which is arranged capable of emitting light of a color other than the predetermined color light toward the one end face The light source, the light source mounted thereon, and the light source mounting substrate disposed facing the one end surface of the light guide plate and the light source mounting substrate are provided separately, and the other light sources are mounted. Another light source mounting substrate having a plate surface arranged in a direction along the light emitting direction of the other light source, and the light source mounting substrate and the other light source mounting substrate are disposed apart from each other. It is characterized by.
The light source plate, the light source , the other light source, the light source mounting substrate, and a case disposed to house the other light source mounting substrate are further provided, the light source mounting substrate , attached to the side opposite to the end face of the one of the light guide plate among the casing, mounting board the other light source is preferably attached to the bottom or top of the case.

With the above configuration, when a light source that emits predetermined color light and another light source that emits light of a color other than the color light are provided, the characteristics of the other light source deteriorate due to heat generation of the light source that emits the predetermined color light . A liquid crystal display module capable of suppressing the above can be provided.

  1 and 2 are exploded perspective views for explaining the liquid crystal display module 100 according to Embodiment 1 of the present invention, and FIGS. 3 and 4 are sectional views and schematic views of the liquid crystal display module 100. FIG. In order to avoid complication of the drawings, some of the elements are omitted in each of the following drawings. For example, in FIGS. 1 and 2, LEDs 300 and 350 described later are omitted.

  The liquid crystal display module 100 includes a liquid crystal panel 120, a backlight module (hereinafter abbreviated as "backlight") 200, a circuit board 140, a flexible printed wiring board 160 configured by a plurality of wirings, and a bezel. 180. Specifically, the liquid crystal panel 120 is disposed to face the light emitting surface of the backlight 200 and is accommodated in the bezel 180 together with the backlight 200. A circuit board 140 is connected to the liquid crystal panel 120 via a plurality of flexible printed wiring boards 160. 1 and 2, the circuit board 140 and the flexible printed wiring board 160 are illustrated between the liquid crystal panel 120 and the backlight 200 in order to avoid the complexity of the drawings. On the other hand, the flexible printed wiring board 160 is disposed in the gap between the backlight 200 and the bezel 180 and disposed on the opposite side of the liquid crystal panel 120.

  The backlight 200 includes a case 400, a plurality of white LEDs 300, a plurality of red LEDs 350, LED mounting boards 320 and 370, a reflection sheet 220, a light guide plate 240, and an optical sheet 260. . The plurality of LEDs 300 and 350, the LED mounting substrates 320 and 370, the reflection sheet 220, the light guide plate 240, and the optical sheet 260 are accommodated in the case 400.

  Case 400 includes a back case 420 and a front case 440.

  The back case 420 includes a substantially flat bottom portion 421 and a side portion 422 that extends from the peripheral edge of the bottom portion 421 in a direction that intersects (or is orthogonal to) the bottom portion 421 and is opposed to the bottom portion 421. That is, the side on which the liquid crystal panel 120 is disposed is open. All the side portions 422 extend in the same direction with respect to the bottom portion 421. Here, a case where the bottom portion 421 is substantially rectangular in plan view is illustrated.

  The front case 440 continues to intersect the front frame portion from the front frame portion having a substantially frame shape (here, for example, a shape obtained by forming an opening at the center of a flat plate) from the peripheral edge (outer peripheral edge) of the front frame portion ( And a side portion extending in a direction orthogonal thereto. All sides extend in the same direction with respect to the front frame. The opening of the front frame has a shape, size, etc. corresponding to the display area of the liquid crystal panel 120. In other words, the substantially frame shape of the front frame is the peripheral area of the liquid crystal panel 120 (the peripheral area of the display area). And has a shape, size, etc. corresponding to the frame region.

  The front case 440 covers the rear case 420 from the side opposite to the bottom 421, that is, from the opening side of the rear case 420, and is disposed so as to accommodate the rear case 420. At this time, the side portion of the front case 440 is positioned outside the back case 420 and faces (overlaps) the side portion 422 of the back case 420.

  The back case 420 and the front case 440 are made of, for example, a metal such as aluminum or stainless steel, and are processed into the above-described shape by, for example, pressing.

  The plurality of white LEDs 300 and the plurality of red LEDs 350 constitute a light source of the backlight 200 and are attached to the side portion 422 in the back case 420. Specifically, a plurality of white LEDs 300 are mounted on an LED mounting board 320, and a plurality of red LEDs 350 are mounted on separate LED mounting boards 370. These LED mounting boards 320 and 370 are, for example, thermally conductive (not shown). It is affixed to the inner surface of the side portion 422 of the back case 420 (in other words, the case 400) with a high double-sided tape. The white LED 300 is a top view type (top emission type) here, and outputs light in a direction intersecting (or orthogonally intersecting with) the side portion 422 of the back case 420, in other words, in a direction substantially parallel to the bottom portion 421. Is emitted. Similarly, the red LED 350 is a top view type, and emits red light 351 in a direction intersecting (perpendicular to here) the side portion 422.

  The LED mounting board 320 is composed of, for example, a flexible printed wiring board, and supplies power to each white LED 300. The LED mounting substrate 320 has a band shape of equal width in plan view, and a plurality of white LEDs 300 are arranged in a line in the longitudinal direction of the band shape. The LED mounting board 370 is configured in the same manner as the LED mounting board 320, and supplies power and the like to the red LEDs 350 mounted in a line in the longitudinal direction. The LED mounting boards 320 and 370 are arranged side by side in the height direction of the side part 422 of the back case 420, in other words, in the direction intersecting (in this case, orthogonal) to the bottom part 421. At this time, the LED mounting substrates 320 and 370 are arranged so that the longitudinal direction of the LED mounting substrates 320 and 370 intersects the arrangement direction of the LED mounting substrates 320 and 370 (in such a manner as to be orthogonal thereto). The LED mounting substrates 320 and 370 are disposed apart from each other (disposed in a non-contact state). 3 and 4, the LED mounting substrate 370 and the red LED 350 are disposed on the side close to the bottom portion 421, and the LED mounting substrate 320 and the white LED 300 are disposed on the side close to the opening of the back case 420. Although illustrated, the arrangement may be reversed.

  The white LED 300 and the red LED 350 are not aligned (not opposed) in the arrangement direction of the LED mounting substrates 320 and 370, that is, in the height direction of the side portion 422 of the back case 420. The white LEDs 300 and the red LEDs 350 are alternately arranged in the longitudinal direction of the LED mounting boards 320 and 370, and are arranged in a zigzag manner with a gap between the mounting boards 320 and 370 interposed therebetween. Further, the white LED 300 is disposed on a side portion close to the mounting substrate 370 for the red LED 350, and similarly, the red LED 350 is disposed on a side portion close to the mounting substrate 320 for the white LED 300.

  For example, the LEDs 300 and 350 may be attached only to one side 422 of the back case 420, in other words, only to the side 422 extending from one side of the bottom 421 of the back case 420, or the opposite side 422. It may be further attached to.

  The light guide plate 240 is made of, for example, a resin flat plate member and is accommodated in the back case 420. In the back case 420, one end surface 242 of the light guide plate 240 is opposed to both the LEDs 300 and 350 in correspondence with the arrangement form of the LEDs 300 and 350. That is, both the white LED 300 and the red LED 350 are disposed next to one end surface 242 of the light guide plate 240 in the back case 420, and the LEDs 300 and 350 are attached to the back case 420 at positions facing the one end surface 242. ing. Lights 301 and 351 emitted from the LEDs 300 and 350 are introduced into the light guide plate 240 from the one end surface 242, and the light guide plate 240 converts the introduced light into surface light emission and emits the light from the upper surface 241. The upper surface 241 is a surface of the light guide plate 240 that faces the liquid crystal panel 120.

  The reflection sheet 220 is disposed between the back case 420 and the light guide plate 240 except between the LEDs 300 and 350 and the light guide plate 240. The reflection sheet 220 prevents light 301 and 351 introduced from one end surface 242 to the light guide plate 240 from leaking from the other end surface 242 and the like, and introduces the leaked light again into the light guide plate 240 to transmit light. It improves the usage efficiency.

  The optical sheet 260 is disposed on the upper surface 241 of the light guide plate 240. The optical sheet 260 is configured by, for example, laminating a lens sheet, a diffusion sheet, and the like, and forms light emitted from the upper surface 241 of the light guide plate 240 in a more uniform surface light emission. Configure.

  The reflection sheet 220, the light guide plate 240, and the optical sheet 260 are laminated in this order in the back case 420, and the front case 440 is covered from above. The optical sheet 260 is exposed at the opening of the front case 440, and the output light (surface emission) of the backlight 200 is emitted from the opening.

  The liquid crystal panel 120 is laminated to face the optical sheet 260 exposed from the opening of the case 400. At this time, the liquid crystal panel 120 faces the light guide plate 240 through the optical sheet 260. Note that the liquid crystal panel 120 may have various structures as long as it is a type using the backlight 200, that is, a transmissive type or a transflective type.

  The bezel 180 has a substantially frame shape (here, for example, a shape obtained by forming an opening at the center of a flat plate), and the front frame portion continues from the periphery (outer periphery) of the front frame portion (here In this case, the side portion extends in a direction perpendicular to the side. All sides extend in the same direction with respect to the front frame. The opening of the front frame portion has a shape, size, etc. corresponding to the display area of the liquid crystal panel 120. In other words, the substantially frame shape of the front frame portion corresponds to the peripheral area of the liquid crystal panel 120, etc. have.

  The bezel 180 is placed on the liquid crystal panel 120 from the side opposite to the backlight 200 and accommodates the liquid crystal panel 120 and the backlight 200. At this time, the side portion of the bezel 180 is located outside the front case 440, faces (overlaps) the side portion of the front case 440, and faces the side portion 422 of the rear case 420 via the side portion of the front case. (Overlapping). The bezel 180 is made of a metal such as aluminum or stainless steel, and is processed into the above shape by, for example, pressing.

  As described above, the mounting substrate 370 for the red LED 350 is provided separately from the mounting substrate 320 for the white LED 300, and the both mounting substrates 320 and 370 are arranged apart from each other. For this reason, even when the red LED 350 is disposed near the white LED 300, the heat generated by the white LED 300 can be prevented from being transmitted to the red LED 350 side through the mounting boards 320 and 370. Therefore, it is possible to suppress the deterioration of the characteristics of the red LED 350 due to the heat generated by the white LED 300.

  Further, since the white LED 300 and the red LED 350 are not opposed to each other in the arrangement direction of the LED mounting substrates 320 and 370, the arrangement in which the white LED 300 and the red LED 350 face each other in the arrangement direction and are closest to each other is avoided. For this reason, heat generated by the white LED 300 is prevented from being directly transmitted to the red LED 350. Therefore, the characteristic deterioration of the red LED 350 can be further suppressed.

  5 and 6 are a cross-sectional view and a schematic view for explaining the liquid crystal display module 100B according to the second embodiment. The liquid crystal display module 100B has a configuration in which the LED mounting substrates 320 and 370 in the liquid crystal display module 100 are replaced with the LED mounting substrates 320B and 370B, and the other configurations are basically the same as those of the liquid crystal display module 100.

  The LED mounting substrate 320B has a band shape as a whole in plan view, and one side portion (end portion in the width direction) of the band shape has an uneven shape in plan view. Similarly to the LED mounting substrate 320B, the LED mounting substrate 370B has a band shape as a whole in a plan view, and one side portion of the band shape has an uneven shape in a plan view. The LED mounting substrates 320B and 370B are arranged so that their concavo-convex shapes face each other, and are arranged so as to engage each other's concave and convex portions. The LED mounting boards 320 </ b> B and 370 </ b> B are arranged in the height direction of the side portion 422 of the back case 420, but are disposed apart from each other and attached to the side portion 422 of the back case 420. The LED mounting boards 320B and 370B can be configured by, for example, forming a flexible printed wiring board in the above-described shape, and supplies power to the LEDs 300 and 350.

  The white LEDs 300 are mounted on the respective convex portions of the LED mounting board 320B, and are arranged in a line in the longitudinal direction of the LED mounting board 320B. Similarly, the red LEDs 350 are mounted on the respective convex portions of the LED mounting board 370B, and are arranged in a line in the longitudinal direction of the LED mounting board 370B. Since the LED mounting substrates 320B and 370B are arranged so as to engage the concave portions and the convex portions, the white LED 300 and the red LED 350 are alternately arranged in the longitudinal direction of the LED mounting substrates 320B and 370B. In this case, the LEDs 300 and 350 can be arranged in a line.

  According to this configuration, as compared with the case of the liquid crystal display module 100, the arrangement space of the LEDs 300 and 350 and the LED mounting substrates 320B and 370B can be reduced and the thickness can be reduced.

  Here, FIG. 6 illustrates a case where the uneven shape is angular, but a rounded uneven shape without corners may be used. 5 and 6, the LED mounting board 320B and the white LED 300 may be disposed on the side close to the bottom 421.

  FIG. 7 is a cross-sectional view illustrating a liquid crystal display module 100C according to Embodiment 3. The liquid crystal display module 100C has a configuration in which the red LED 350 in the liquid crystal display module 100 is replaced with a side-view type (side light emitting type) red LED 350C, and other configurations are basically the same as those of the liquid crystal display module 100.

  In the liquid crystal display module 100 </ b> C, the red LED 350 </ b> C is attached to the bottom 421 of the back case 420 together with the LED mounting substrate 370, in other words, to the bottom 421 of the case 400. The red LED 350 </ b> C is disposed between the side portion 422 to which the white LED 300 is attached and the end surface 242 of the light guide plate 240 facing the side portion 422. That is, also in the liquid crystal display module 100 </ b> C, the LEDs 300 and 350 </ b> C and the mounting substrates 320 and 370 are disposed next to the end surface 242 of the light guide plate 240. The side-view type red LED 350C emits red light 351 in a direction substantially parallel to the bottom 421, and this red light 351 is introduced into the end face 242 of the light guide plate 240 into which the white light 301 from the white LED 300 is introduced. .

  According to this configuration, the red LED 350C and its mounting board 370 are attached to the bottom part 421 of the case 400, and only the white LED 300 and its mounting board 320 are attached to the side part 422 of the case 400. For this reason, compared with the liquid crystal display modules 100 and 100B, the arrangement space of the LEDs 300 and 350C and the LED mounting substrates 320 and 370 can be reduced and the thickness can be reduced. In addition, separate heat dissipation measures can be easily taken for the white LED 300 and the red LED 350C. For example, it is possible to select a heat dissipation fin according to the amount of heat generated by each of the LEDs 300 and 350C.

  Here, the red LED 350C and the LED mounting substrate 370 may be attached to the front frame portion of the front case 440 in the case 400, in other words, to the upper portion of the case 400. Further, the top view type red LED 350 and the LED mounting substrate 370 are attached to the side portion 422 of the case 400, and the side view type white LED and the LED mounting substrate 320 on which the white LED is mounted are attached to the bottom portion 421 or the upper portion of the case 400. It may be attached.

  The liquid crystal display modules 100, 100B, 100C and the like can be applied to, for example, an instrument panel of a car, various devices, and the like. For example, when displaying various information in color using a white LED, and displaying important information. Can be used by switching to a red LED for display. The applications of the liquid crystal display modules 100, 100B, 100C and the like are not limited to this.

  In the above, the combination of the white LED 300 and the like and the red LEDs 350 and 350C is illustrated, but an LED that emits light of a color other than white may be used instead of the red LEDs 350 and 350C. Moreover, it is also possible to apply another light source, for example, an EL (Electro Luminescence) element, instead of the LED.

It is a disassembled perspective view explaining the liquid crystal display module which concerns on Embodiment 1 of this invention. It is a disassembled perspective view explaining the liquid crystal display module which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the liquid crystal display module which concerns on Embodiment 1 of this invention. It is a schematic diagram explaining the liquid crystal display module which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the liquid crystal display module which concerns on Embodiment 2 of this invention. It is a schematic diagram explaining the liquid crystal display module which concerns on Embodiment 2 of this invention. It is sectional drawing explaining the liquid crystal display module which concerns on Embodiment 3 of this invention.

Explanation of symbols

  100, 100B, 100C liquid crystal display module, 120 liquid crystal panel, 240 light guide plate, 242 end face, 300 white LED (white light source), 301 white light, 320, 320B LED mounting substrate (white light source mounting substrate), 350, 350C red LED (other light source), 351 Red light (light of a color other than white), 370, 370B LED mounting substrate (other light source mounting substrate), 400 case, 421 bottom.

Claims (4)

LCD panel,
A light guide plate disposed facing the liquid crystal panel;
Arranged next to one end face of the light guide plate, a light source is emitted can position the predetermined color light toward the one end face,
Wherein the light guide plate disposed adjacent to the one end face, and other light sources disposed capable of emitting light of a color other than the predetermined color light toward the one end face,
The light source is mounted, and a light source mounting substrate disposed to face the one end face of the light guide plate;
Another light source mounting substrate provided separately from the light source mounting substrate , wherein the other light source is mounted and disposed opposite to the one end surface of the light guide plate;
Wherein the mounting substrate for other light sources and the mounting substrate the light source, a liquid crystal display module, characterized by being spaced apart from each other with a gap. The liquid crystal display module according to claim 1,
2. The liquid crystal display module according to claim 1, wherein the white light source mounting substrate and the other light source mounting substrate have a concavo-convex shape in a plan view and are arranged so as to engage each other with the concave portion and the convex portion. LCD panel,
A light guide plate disposed facing the liquid crystal panel;
Arranged next to one end face of the light guide plate, a light source is emitted can position the predetermined color light toward the one end face,
Wherein the light guide plate disposed adjacent to the one end face, and other light sources disposed capable of emitting light of a color other than the predetermined color light toward the one end face,
The light source is mounted, and a light source mounting substrate disposed to face the one end face of the light guide plate;
Other light source mounting substrate provided separately from the light source mounting substrate , the other light source is mounted, and a plate surface is disposed in a direction along the light emitting direction of the other light source,
The liquid crystal display module, wherein the light source mounting substrate and the other light source mounting substrate are disposed apart from each other. The liquid crystal display module according to claim 3,
The light guide plate, the light source , the other light source, the light source mounting substrate, and a case disposed to house the other light source mounting substrate,
Mounting substrate the light source is attached to the side opposite to said one end face of the light guide plate among the case, the other mounting substrate light source that is attached to the bottom or top of the case A liquid crystal display module characterized by

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