JP6941794B2 - Image display device and component mounting board - Google Patents

Description

The present disclosure relates to an image display device including a display panel such as a liquid crystal cell, and a component mounting substrate used for the image display device or the like.

Patent Document 1 discloses an image display device including a liquid crystal panel, a base plate arranged on the back side, and a light source attached to the base plate.

Japanese Unexamined Patent Publication No. 2006-179494

The present disclosure provides an image display device in which components are unlikely to fall off even when stress is applied to the component mounting board, and a component mounting board.

The image display device in the present disclosure is attached to a display panel for displaying an image, a plate-shaped lower frame arranged on the back side of the display panel so as to face the display panel, and the display panel side of the lower frame. An image display device including a long plate-like flexible component mounting board on which a component that is a light source that illuminates the display panel from the back side is mounted. The component mounting board is a long plate. A substrate having a shape of flexibility and a conductor layer arranged on both sides in the longitudinal direction with a gap of a predetermined width extending in the lateral direction of the substrate and connected to each of the components are provided, and the gap is provided. The component mounting board is provided with an intersecting portion extending in an intersecting state with respect to a virtual line that virtually connects one end to the other end in the shortest direction.

Further, the component mounting substrate in the present disclosure is arranged on both sides in the longitudinal direction with a gap of a predetermined width extending in the lateral direction of the substrate having a long plate-like flexibility and the substrate having a predetermined width. A conductor layer to be formed and a component connected to the conductor layer across the gap are provided, and the gap is a virtual line that virtually connects one end to the other end of the substrate in the lateral direction at the shortest distance. On the other hand, it has an intersection that extends in an intersecting state.

According to the image display device and the component mounting board in the present disclosure, it is possible to prevent the component from falling off from the component mounting board even when stress is generated.

It is a perspective view which shows the appearance of the image display device which concerns on embodiment. It is a perspective view which shows from the rear by disassembling the liquid crystal module which concerns on embodiment. It is a perspective view which shows from the front by disassembling the liquid crystal module which concerns on embodiment. It is a top view which shows the LED sheet which concerns on embodiment. It is a top view which shows another example of the gap of the LED sheet. It is a top view which shows another example of the gap of the LED sheet. It is a top view which shows another example of the gap of the LED sheet. It is a schematic diagram which shows the copper foil pattern formed on the conventional component mounting substrate.

The inventor of the present application has found that the following problems occur with respect to the component mounting substrate used in the conventional image display device. Even in an image display device such as a conventional liquid crystal television, a plate-shaped lower frame having high rigidity is arranged on the back surface of the liquid crystal panel, and a component mounting board on which a light source for a backlight is mounted is attached to the lower frame. There is. Since this component mounting board is thick and easy to handle, it can be easily positioned when it is adhered to the lower frame.

However, since recent image display devices are required to be larger and thinner, the component mounting substrate for the backlight is also made longer and thinner, and is almost in the form of a tape. Therefore, when such a thin tape-shaped component mounting substrate is attached to the lower frame, components such as an LED (light emitting diode) attached to the component mounting substrate may fall off.

Therefore, as a result of diligent studies by the inventor of the present application, when the component mounting substrate is curved, if the gap between the wiring patterns of the relatively hard copper foil is straight, the stress is concentrated on the portion and the curvature is short. It has been found that the parts that are curved at a radius and are connected across this gap are likely to fall off. Furthermore, it has been found that this stress is strongly generated when the component mounting board is peeled off from the lower frame when reattaching because the position of the component mounting board attached to the lower frame is improper.

The present disclosure has been made based on such knowledge, and provides an image display device provided with a component mounting board in which stress is unlikely to be concentrated in a gap of a wiring pattern, and a component mounting board.

Hereinafter, embodiments will be described with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that the inventor of the present application provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and intends to limit the subject matter described in the claims by these. is not it.

Further, in the following embodiments, for convenience of explanation, the vertical direction coincides with the Y-axis direction, the front-rear direction coincides with the Z-axis direction, and the left-right direction coincides with the X-axis direction. This does not limit the posture of the image display device 10 according to the present disclosure during manufacturing or use. Further, in the following description, for example, the X-axis plus side indicates the arrow direction side of the X-axis, and the X-axis minus side indicates the side opposite to the X-axis plus side. The same applies to the Y-axis direction and the Z-axis direction.

FIG. 1 is a perspective view showing the appearance of the image display device according to the embodiment.

As shown in the figure, the image display device 10 according to the present embodiment is a liquid crystal television, and includes a liquid crystal module 100 including a display panel 102, a bezel 120, a back cover 103, and a stand 200. There is.

In the present embodiment, the display panel 102 is a so-called liquid crystal cell, which is an element in which a liquid crystal is enclosed between a plurality of glass plates. The display panel 102 is controlled based on the video signal input to the image display device 10 to display the video.

The bezel 120 and the back cover 103 are structural members that form the outer shell of the liquid crystal module 100 that houses the display panel 102 and the like. The bezel 120 protects the outer peripheral portion of an element such as the display panel 102 and forms a bezel (picture frame). In this embodiment, a resin such as polycarbonate (PC) is used as the material for the bezel 120 and the back cover 103.

FIG. 2 is a perspective view showing the liquid crystal module according to the embodiment disassembled from the rear.

FIG. 3 is a perspective view of the liquid crystal module according to the embodiment disassembled and shown from the front.

The bezel 120 houses a plurality of parts from the display panel 102 to the lower frame 140. In the case of the present embodiment, in the space surrounded by the bezel 120, the back cover 103, and the display panel 102, the mold frame 130, the optical sheet unit 105 including two or three optical sheets, and the diffuser plate 106 The brightness uniform plate 107, the reflective sheet 108, the LED sheet 109, the relay sheet 110, the lower frame 140, and the support pin 112 are arranged.

The mold frame 130 supports the display panel 102 and sandwiches a plurality of parts (so-called backlights) from the optical sheet unit 105 to the LED sheet 109 and the relay sheet 110 together with the lower frame 140.

The optical sheet unit 105 is configured by stacking two or three types of sheets having different optical characteristics. The optical sheet unit 105 includes, for example, a vertical prism sheet, a horizontal prism sheet, a diffusion sheet, and the like.

The diffuser plate 106 diffuses light from a plurality of light source components arranged on the LED sheet 109, which will be described later.

The luminance uniform plate 107 homogenizes the light from a plurality of LEDs arranged on the LED sheet 109. The luminance uniform plate 107 is a member in which a plurality of holes having different diameters are formed. Specifically, in the luminance uniform plate 107, holes having an extremely small diameter are formed directly above each of the plurality of LEDs, and holes having a large diameter are formed as the distance from the component that is the light source increases. With the above configuration, the luminance uniform plate 107 makes the orientation characteristics of light from each light source component gentle.

The diffuser plate 106 is a member that further diffuses the light from each component whose orientation characteristics are smoothed by the luminance uniform plate 107. The light transmitted through the diffuser plate 106 is emitted as light with less uneven brightness.

The reflective sheet 108 is provided with holes in portions corresponding to LEDs, which are a plurality of light sources arranged on the LED sheet 109.

The lower frame 140 is a plate-shaped member formed of a thin sheet metal and having a size enough to cover a display panel to which the LED sheet 109 and the relay sheet 110 are attached, and is a member called a lower frame or the like. Specifically, after the LED sheet 109 and the relay sheet 110 are attached to the lower frame 140, the reflective sheet 108 is exposed to the lower frame 140 so that the light source component is exposed from each of the plurality of holes of the reflective sheet 108. Is affixed. The light from each component is reflected by the reflective sheet 108 and emitted to the Z-axis plus side.

Each of the plurality of support pins 112 is attached from above the reflective sheet 108 so as to sandwich the reflective sheet 108 together with the lower frame 140. The support pin 112 has a tip portion to be inserted into a hole provided in the luminance uniform plate 107 and a flange portion for supporting the luminance uniform plate 107.

The brightness uniform plate 107 is provided with a plurality of holes into which the tips of the support pins 112 are inserted. It is attached to the lower frame 140 while being supported by the lower frame 140.

The diffuser plate 106 is supported by the apex portion (tip of the tip portion) of the support pin 112, and the peripheral edge portion of the diffuser plate 106 is supported by the lower frame 140.

A cut-out that suspends the optical sheet unit 105 is formed on one side of the lower frame 140, which is the upper part when the image display device 10 is installed. The optical sheet unit 105 is provided with a tab having a rectangular hole for hooking the cut-up.

FIG. 4 is a plan view showing the LED sheet according to the embodiment.

The LED sheet 109 is a long plate-like flexible component mounting board on which the LED 191 which is a light source for illuminating the display panel 102 from the back side is surface-mounted as a component, which is attached to the display panel 102 side of the lower frame 140. be. That is, the LED sheet 109 is a component mounting substrate on which the LED 191 as a component is surface-mounted, and the LED sheet 109 includes a base film 190, a gap 193, and a conductor layer 192. In the case of the present embodiment, in the LED sheet 109, a metal pin 210 made of metal for electrically connecting to the relay sheet 110 is connected to the conductor layer 192.

In the case of the present embodiment, the LED sheet 109 is attached to the lower frame 140 by an adhesive layer such as double-sided tape that can be reattached, and is attached to the lower frame 140 at the time of manufacturing the image display device 10. If the position of the LED sheet 109 is misaligned, the LED sheet 109 can be peeled off from the lower frame 140 and reattached.

The base film 190 is a long plate-like flexible resin film having insulating properties. The base film 190 is a substrate on which a conductor layer 192 of a so-called flexible printed circuit board (FPC: Flexible Printed Circuit) is printed.

The conductor layer 192 is a conductive layer attached in a film shape to the main surface of the base film 190. The material constituting the conductor layer 192 is not particularly limited as long as it is conductive, but in the case of the present embodiment, a copper foil is adopted as the conductor layer. The conductor layers 192 are arranged on both sides in the longitudinal direction (Y-axis direction in the drawing) with a predetermined width gap 193 extending in the lateral direction (X-axis direction in the drawing) of the base film 190, and are connected to the LED 191 respectively. Has been done. The length (width) of the conductor layer 192 to which the LED 191 is connected in the lateral direction is set wider than the width of the LED 191 and extends in the longitudinal direction with the same width except for the gap 193. By forming the conductor layer 192 connected to the LED 191 into this shape, the heat generated by the LED 191 can be efficiently dissipated by the conductor layer 192. Further, the conductor layer 192 has a U-shape as a whole, which is arranged so as to sandwich the separation band 194 in the lateral direction of the base film 190 and is connected at one end in the longitudinal direction. This involves connecting a plurality of LEDs 191 mounted in series on the base film 190 via two metal pins 210 mounted side by side at the other end of the base film 190 in the longitudinal direction. It is a shape for connecting.

Further, in order to widen the length of the conductor layer 192 to which the LED 191 is directly connected in the lateral direction and improve the heat dissipation efficiency, the separation band 194 is arranged so as to be offset to one side in the lateral direction.

The gap 193 is a gap between the conductor layers 192 arranged side by side in the longitudinal direction of the base film 190. The separation band 194 is a gap between the conductor layers 192 arranged side by side in the lateral direction of the base film 190. These are spaces for insulating adjacent conductor layers 192. The gap 193 and the separation band 194 may be filled with a resin resist. The width of the gap 193 is not particularly limited as long as it is a predetermined width to which the conductor layer 192 forming the gap 193 can be connected to the two electrodes included in the LED 191. Further, the width of the gap 193 may be constant, and can be arbitrarily set such that the width is changed between the intersection 195 and other portions.

The gap 193 extends in an intersecting state with respect to a virtual line 199 (a line virtually extending in the X-axis direction in the figure) that virtually connects one end to the other end of the LED sheet 109 in the lateral direction. It has an intersection 195. That is, the wiring pattern at the end of the conductor layer 192 at the portion where the LED 191 is inserted is made into a staircase shape or an uneven shape. As a result, when the LED sheet 109 is bent in the longitudinal direction (Y-axis direction in the drawing) with respect to the conventional gap arranged in a straight line along the virtual line 199, the conductor layer 192 is a relatively hard portion. In the meantime, the stress concentrated in the exposed gap 193 of the relatively soft base film 190 can be dispersed. Therefore, the radius of curvature of the deflection due to the stress in the vicinity of the LED 191 surface-mounted across the gap 193 becomes relatively large, and it is possible to prevent the LED 191 from falling off due to the deflection.

Further, in the case of the present embodiment, the intersection 195 of the gap 193 is arranged in a state orthogonal to the virtual line 199. As a result, the intersection 195 extending in the longitudinal direction of the LED sheet 109 can effectively counter the stress due to the deflection in the longitudinal direction.

The gap 193 also includes a plurality of intersections 195. As a result, the stress concentrated in the gap 193 can be effectively dispersed, and the bending in the vicinity of the gap 193 can be made gentle.

Further, the plurality of intersections 195 are arranged rotationally symmetrically about the LED 191 mounted across the gap 193. As a result, the LED sheet 109 flexes evenly in the vicinity of the LED 191 and can prevent the LED 191 from falling off.

The LED 191 is not particularly limited as long as it is an electronic component or an electric component mounted on the LED sheet 109. In the case of the present embodiment, since the LED sheet 109 functions as a backlight of the liquid crystal module 100, the LED 191 is an LED light source that emits white light.

The relay sheet 110 includes a connector (metal pin on the female side) connected to the metal pin 210 on the male side of the LED sheet 109, and forms an electric path for sending power and control signals to the LEDs 191 which are a plurality of light sources. It is an FPC that has been made. The relay sheet 110 is also attached to the lower frame 140 in the same manner as the LED sheet 109. A reflective layer that reflects the light from the LED 191 toward the display panel 102 may be formed on at least one of the relay sheet 110 and the LED sheet 109.

The invention of the present application is not limited to the above-described embodiment. For example, another embodiment realized by arbitrarily combining the components described in the present specification and excluding some of the components may be the embodiment of the present invention. In addition, the present invention also includes modifications obtained by making various modifications that can be conceived by those skilled in the art within the scope of the gist of the present invention, that is, the meaning indicated by the wording described in the claims, with respect to the above-described embodiment. Is done.

For example, as shown in FIG. 5, the entire gap 193 may be a straight intersection 195.

Further, as shown in FIGS. 5 and 6, the LED 191 may be mounted so as to straddle the intersection 195. In particular, when the LED 191 is straddled and connected to the intersection 195 orthogonal to the virtual line 199 as shown in FIG. 6, the direction of contact between the LED 191 and the conductor layer 192 is parallel to the virtual line 199. The LED 191 is less likely to fall off even when the LED sheet 109 is bent in the longitudinal direction.

Further, as shown in FIG. 7, the intersection 195 does not have to be arranged rotationally symmetrically. When electric power or the like is supplied from both ends of the LED sheet 109 in the longitudinal direction, the separation band 194 may not be provided.

Further, the gap 193 may be composed of not only a straight line but also a curved line.

Further, in the present embodiment, the image display device 10 is provided as a device for displaying still images and moving images in the image display device 10. However, the configuration of the image display device 10 may be applied to, for example, a monitor display for a personal computer, a mobile terminal such as a tablet terminal or a smartphone, and the like.

Further, in the present embodiment, each of the bezel 120 and the mold frame 130 uses a resin such as a PC. However, a metal such as SUS may be used as the material. When metal is used for the four side portions (straight portions) of the mold frame 130, it is better to form the four corner portions with resin.

The present disclosure is applicable to, for example, a television receiver, a monitor display, a digital signage, a tablet terminal, a smartphone, a table type display device, or the like.

10 Image display device 100 Liquid crystal module 102 Display panel 103 Back cover 105 Optical sheet unit 106 Diffuse plate 107 Brightness uniform plate 108 Reflective sheet 109 LED sheet 110 Relay sheet 112 Support pin 120 Bezel 130 Mold frame 140 Lower frame 190 Base film 191 LED
192 Conductor layer 193 Gap 194 Median strip 195 Intersection 199 Virtual line 200 Stand 210 Metal pin

Claims (7)

A display panel for displaying an image, a plate-shaped lower frame arranged on the back side of the display panel so as to face the display panel, and a plate-shaped lower frame attached to the display panel side of the lower frame, and the display panel is mounted on the back side. An image display device including a long plate-like flexible component mounting substrate on which components that are light sources to illuminate from are mounted.
The component mounting board is
A long plate-like flexible substrate and
A conductor layer is provided on both sides in the longitudinal direction with a gap of a predetermined width extending in the lateral direction of the substrate and connected to each of the components.
The gap is
Entire widthwise direction of the one that is cross-section extending in a straight line in a cross state to imaginary line virtually connecting the other end in the shortest from the end <br/> image display device of the component mounting board. The image display device according to claim 1, wherein the width of the gap is constant. The image display device according to claim 1 or 2, wherein the gap is filled with a resin resist. The conductor layer is disposed to sandwich the separation zone in the lateral direction of the substrate, any one of one longitudinal end portion at the <br/> claim 1 connected through the component 3 Image display device. The image display device according to any one of claims 1 to 4, wherein the parts are mounted orthogonally across the intersection. The image display device according to any one of claims 1 to 5, wherein the lower frame and the component mounting substrate are attached by an adhesive layer that can be reattached. A long plate-like flexible substrate and
Conductor layers arranged on both sides in the longitudinal direction with a gap of a predetermined width extending in the lateral direction of the substrate, respectively.
A component that straddles the gap and is connected to the conductor layer is provided.
The gap is
Whole <br/> component mounting board is a cross-section which extends in a straight line in a cross state to imaginary line virtually connecting the one other end from the end of the short-side direction in the shortest of the substrate.

Images