JP2001337627A - Light emitting display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting display unit whose upside/downside can be recognized easily and, when the display unit constitutes a multiplicity of light emitting display device, prevents a displayed figure from being read mistakenly due to light leakage from an opening and also prevents paint from peeling off due to abrasion of the display surface when it is transported in a tube, or the like. SOLUTION: A light emitting section is configured by fitting an LED chip 2 to one end of a lead 1 at segment of a figure which is part of a display image. A reflection case 3 in which a light guiding part 32 is formed corresponding to each segment is mounted so as to enclose the above LED chip 2 in each of the light guiding part 32. Translucent resin is filled in the reflection case 3 to fix the light guiding part 32 and one end of a plurality of the leads 1. Also an uneven spot is provided in at least one part of an outerwall of the reflection case 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display for displaying characters such as numbers and characters having a 7-segment or dot matrix structure by using a light emitting element such as an LED, which is used, for example, for displaying the amount of money in a vending machine. Related to the device. More specifically, when mounting on a circuit board,
The present invention relates to a light-emitting display device having a structure which can easily be distinguished from the upside-down direction and the like, facilitates mounting, and prevents light from leaking from a space between a plurality of light-emitting devices so as to be hardly misidentified.

[0002]

2. Description of the Related Art A conventional light emitting display device having a seven-segment structure has a structure as shown in FIG. 6, for example.
That is, a light guide portion that forms seven segments is formed in the reflective case 3, and a light emitting element (hereinafter, referred to as an LED) (not shown) is die-bonded and wire-bonded to a lead for each segment, and a light-transmitting portion is formed in the light guide portion. Is formed by filling the resin 4. LED
Has an anode and a cathode, and two leads are required for each segment, but one lead of the anode or the cathode can be common to each segment. The leads are formed of 8 to 10 leads (there is also a display of a decimal point), and a plurality of leads 1 are arranged along two long sides in the vertical direction (both sides in the display direction) or both upper and lower sides.
Is provided.

[0003]

The light-emitting display device such as a numeral does not have a decimal point but has the same appearance even if it is turned upside down. However, the connection of the leads is not always symmetrical, and the direction of the connection is accurately recognized. Must be implemented. However, there is a problem that the outer shape is quite symmetrical and it is very difficult to recognize it.

In a light-emitting display device such as a numerical display, the same display is arranged horizontally several times to display a large number of digits. In that case, it is necessary to arrange without any gaps on the side, but from the tolerance of tolerance in the manufacturing stage of the light emitting display device,
It is necessary to consider the mounting tolerance at the mounting stage, etc., and it is designed with a gap of at least 0.1 mm or more, and it is not possible to completely eliminate the gap between the adjacent light emitting display devices. On the other hand, in the light emitting display device in which the back surface of the case is covered with the resin as in the above-described structure, light emitted from the LED leaks to the back surface side of the case via the resin, and the leaked light is transmitted to the adjacent light emitting display device. There is a problem that it is easy to cause a false recognition such as leaking from a gap between the numbers and displaying “1” between numerals.

Further, this type of light-emitting display device has a good appearance by, for example, making the surface other than each segment of numerals black or the like, but the light guide portion near the LED is white so as to absorb light as little as possible. Is preferable because the display luminance can be improved. Therefore, the case is formed by white plastic, and the display surface side and, if necessary, the side surface thereof are coated with black or the like. On the other hand, when transporting this light-emitting display device, dozens of plastic tubes (sticks) are transported, and the display surface is transported during loading or unloading, or when there is room in the interior. Is rubbed in a tube, so that the coating is peeled off, which causes a problem of deteriorating the display quality.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a light-emitting display device having a structure in which the vertical positional relationship of the light-emitting display device can be easily recognized. .

Another object of the present invention is to provide a light emitting display device in which even when a plurality of light emitting display devices are arranged to form a display device, light is not leaked from a gap between the display devices and a display is erroneously recognized. is there.

Still another object of the present invention is to provide a luminous display having a structure such that the display surface is not rubbed and the coating on the display surface is peeled off even when transported in a tube or the like so that the display quality is not deteriorated. It is to provide a device.

Still another object of the present invention is to provide a display device in which a plurality of the same light-emitting display devices are arranged like a numeric display, and the required number of light-emitting display devices are mounted on a circuit board or the like in a state where the necessary number is arranged in advance. It is an object of the present invention to provide a light emitting display device having a structure capable of performing the above.

[0010]

According to the present invention, there is provided a light emitting display device comprising: a plurality of light emitting elements each for lighting a part of a display image; and a plurality of leads to which the light emitting element is die-bonded or wire-bonded to one end. A light guide portion corresponding to a part of the display image is formed, and a reflection case covering the bonded portion, and the light guide portion of the reflection case includes the light emitting element, and
The reflection case is made of a translucent resin so as to fix one end side of the plurality of leads, and at least a part of an outer peripheral side wall of the reflection case is formed with an uneven portion.

Here, the display image means an image that can change the display state of a number, a character, a character, or the like, and a part of the display image is, for example, one segment when a number is displayed by seven segments. means. Further, the uneven portion is not limited to the one having both the concave portion and the convex portion, but also includes the one in which only one of the concave portion and the convex portion is formed.

With this structure, the orientation of the light-emitting display device can be recognized based on the outer shape of the case. Therefore, the correct direction can be easily recognized by automatic recognition using a camera or the like or by manual touch by a human hand. And mounting on a circuit board or the like becomes very easy. Further, the uneven portions are formed so as to have steps in the upper and lower sides or in the left and right sides with respect to the display direction, respectively, so that the light emitting display devices are arranged vertically and / or horizontally. However, by overlapping the steps, the light leaked to the back surface side does not leak from the gap between the adjacent light emitting display devices and is erroneously recognized as a display numeral or the like. Furthermore, for example, the display surface of the light-emitting display device is rubbed in the tube by forming the uneven portion on the upper and lower sides or the left and right sides so that the uneven portion is fitted to the rod-shaped protrusion provided in the tube for conveyance. The lead is stored without being deformed, and the display surface is not peeled off the paint.

[0013] For example, the reflection case has a substantially square shape on the display surface of the display image, and a step is formed on at least the left and right side walls with respect to the display direction. Part of the case is formed so as to be overlapped and arranged, or at least the upper and lower portions or the concave and convex portions are formed on the left and right sides with respect to the display direction, and formed on the side wall in the tube for carrying the light emitting display device. The concavo-convex portion is formed so as to be able to engage with one or more linear protrusions. Here, with respect to the display direction of the display image, left and right or upper and lower means, for example, when displaying numbers and characters, left and right or up and down in a state where the numbers and characters are normally viewed.

The reflection case has a substantially square shape on the display surface of the display image, and has irregularities formed at least on the left and right sides with respect to the display direction, and the irregularities fit into adjacent light emitting display devices. If the left and right concave portions and convex portions are formed so as to obtain, for example, when a display device is configured by arranging a plurality of laterally, after integrating by fitting the concave and convex portions, a circuit board or the like is collectively formed. In addition to being able to be easily mounted, light leakage from a boundary between adjacent light emitting display devices can be blocked, and display quality can be improved.

[0015] The plurality of leads are led to upper and lower portions of the reflection case with respect to a display direction of the display image,
In addition, the light emitting display device is normally bent sideways by being bent substantially perpendicularly to the surface to be bonded, and further bent substantially parallel to the surface to be bonded at the other end. Can be arranged side by side, but no problems such as contact of the leads occur. As a result, the gull wing can be manufactured using a lead frame, and even when the tip (the other end) of the lead is bent so as to be surface-mounted, it is bent outward without bending inward (below the resin). It can also be a surface-mounted type, and can have a structure that makes it easy to check the soldering state. It should be noted that being bent in a direction substantially perpendicular to the surface to be bonded does not mean that the component is completely perpendicular, but that most of the components in the bending direction are perpendicular.

[0016]

Next, a light emitting display device of the present invention will be described with reference to the drawings. As shown in FIG. 1, a light-emitting display device according to the present invention has a front perspective view, a bottom perspective view, and a cross-sectional explanatory view taken along line CC of FIG. A light-emitting element (LED chip) 2 is provided at one end of a lead 1 for each segment, and one end of each lead 1 is formed by die-bonding or wire-bonding the LED chip 2 to form a light-emitting portion. The reflection case 3 in which the light guide 32 is formed so as to correspond to each segment that is a part of the display image is provided so as to include the LED chip 2 in each light guide 32. The translucent resin 4 is filled in the reflection case 3 so as to fix the inside of the light guide 32 and one end of the plurality of leads 1.
In the present invention, the concave and convex portions are formed on at least a part of the outer peripheral side wall of the reflective case 3. In the example shown in FIG.
Protrusions 3a are formed on the upper and lower side walls, respectively.

The light emitting portion has the same structure as the conventional structure. For example, FIG. 1 (c) shows a cross-sectional view taken along the line CC in FIG.
As shown in FIG. 2, each of the side rails 11 of the lead frame 10 having the plurality of leads 1 is bent in the right-angle direction as shown in FIG. A plurality of LED chips 2 are die-bonded to one end of the lead 1, and an upper electrode of each LED chip 2 is formed by wire bonding to one end of another lead 1 with a gold wire 21 or the like. I have. In the example shown in FIG. 2, the lead frame is formed so that each lead 1 is led out in the vertical direction of the number to be displayed. The LED chips 2 constituting each segment are all die-bonded on the same lead 1 to form a common electrode, and the other electrodes of the LED chip 2 are wire-bonded to separate leads, respectively. It may be connected.

The other end of the lead 1 is separated from the lead frame 10 after being fixed by a translucent resin 4 to be described later, and subjected to forming processing so as to be parallel to the bonding surface. The forming process is such that it is placed on a circuit board or the like and can be directly soldered by solder reflow or the like, and is bent so as to be substantially parallel to the bonding surface. Therefore,
If the tip is bent so that it is almost parallel,
The shape in the middle can be formed into various shapes. Further, as shown in FIG. 1, if the distal end is bent to the outside of the reflective case 3, a normal gull wing shape is obtained, but it may be bent to the inside of the reflective case 3.

The above-described light-emitting portions are provided for each segment of the display image (numerals), and the reflection case 3 is covered so that the light-emitting portions enter the light guide portions 32 constituting the segments. The reflection case 3 is made of, for example, a high heat-resistant super engineering plastic (for example, a liquid crystal polymer).
It is made of an injection-molded product made of a white material that easily reflects light, and the display surface has a rectangular shape, for example. The heat-resistant resin is used to withstand the temperature due to solder reflow. In addition,
The display surface side of the reflective case 3 (around the 7-segment light guide section (light emitting section)) is coated with black to improve visibility.

A leg 34 is formed at the side of the reflection case 3 from which the lead 1 is not led out, that is, at the center on both left and right sides with respect to the display direction of numbers and the like. The legs 34 are not required for height positioning, but are formed so that they can be held against external forces by the legs 34. Therefore, the height of the lead 1 is formed to be substantially equal to the bent portion at the tip of the lead 1 or slightly lower (for example, about 0.5 mm). The width is more stable as long as the width is not too close to the lead 1, but is not particularly limited.

The structure on the display surface side of the reflection case 3 is the same as the conventional structure, and as shown in FIG.
Are formed so as to constitute a part of a display image such as a segment, and a lead frame having a light emitting portion formed therein is inserted into the light guide portion 32 so that each light emitting portion is included therein. The display part is formed by filling the translucent resin 4 inside the reflection case 3 inside and in the bonding part of each lead 1. The translucent resin 4 is not limited to a transparent one but may transmit light. For example, if the LED chip 2 emits red light, even if a red dye is mixed in the translucent resin, Without blocking the light of
When it is not displayed, it is easy to see that it is a red light-emitting display device when viewed from the outside.

Next, a method of manufacturing the light emitting display device will be described. The arrangement pattern of the LED chips 2 is formed so as to constitute a part (each segment) of the display image as shown in FIG. 2, and the leads are arranged so that all the leads 1 are led out to the upper and lower parts of the display image. A frame is formed, and as shown in FIG. 2, both sides of the side rail 11 are bent so as to be perpendicular to the bonding surface. Then, the LED chip 2 is die-bonded, and the upper electrode is wire-bonded. Thereafter, a tape is adhered to the display surface side of the reflective case 3 in which the light guide portion of each segment is formed and the uneven portion is formed on the outer peripheral side wall so that the resin does not leak, and the reflective case 3 is turned over. Then, the bonding portion of the lead frame to which the LED chip 2 is bonded is inserted into the reflection case 3 and is filled with resin. The lead frame may be inserted after resin is filled in advance.

Thereafter, the resin is cured by heating, and the side rail 11 of the lead frame is cut and removed to separate the leads 1. Then, a jig is inserted into the base of the lead 1 exposed from the translucent resin 4 to fix the lead 1, and the tip is bent. By performing the bending process while fixing the lead 1 with this jig, it is possible to prevent the light-transmitting resin 4 from cracking and to always bend at a fixed position.

According to the present invention, for example, the convex portion is formed only on the lower portion of the reflective case, and the convex portion is not formed on the outer peripheral wall of the upper portion. The direction can be easily recognized. As a result, accurately and without misdirection
It can be easily implemented. In addition, in the example shown in FIG. 1, since each lead is led out to the upper part and the lower part with respect to the display direction of numbers and the like while using a lead frame, a number of display devices are used side by side. Even if
An interference accident such as contact of leads between adjacent display devices does not occur. Therefore, the tip of the lead can be formed into a gull-wing shape or the like, and when mounting, the lead can be easily soldered without inserting the lead into a through-hole such as a circuit board.

By bending the bent portion at the front end toward the outside of the reflection case, the soldering can be checked at a glance. By bending the inside inward, not only can it be arranged horizontally but also vertically. They can be arranged side by side and can be compactly implemented. Further, in this type of display device, the light-transmitting resin is brittle, cracks and the like are apt to be formed, and the display state is deteriorated when the crack is formed. However, such a problem is caused by fixing the root of the lead and forming. Does not occur.

FIG. 3 shows that the concave and convex portions provided on the outer peripheral wall of the reflection case 3 have step portions 3 on the left and right side walls with respect to the display direction.
In this example, when the light emitting display devices are arranged side by side, the steps 3b and 3c are provided so as to overlap each other. Even with such a shape, it indicates that the lower protrusion 3c is on the right side,
Its orientation can be easily identified. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

On the other hand, as shown in FIG. 3A, when the light-emitting display device is a numerical display, it is often used side by side in order to increase the number of digits. In such a case, the light leaking to the bottom side of the resin 4 may leak to the display surface side from the gap between the adjacent light emitting display devices arranged. However, as shown in FIG.
By forming b and 3c, as shown in FIG. 3B, the steps 3b and 3c can be arranged in an overlapping manner. Even if light leaks to the bottom surface side, the gap portion is shielded by the step portion 3b even if light leaks to the bottom surface side, so that light does not leak from the gap portion to the display surface side. The display quality can be improved. The steps are provided on the left and right sides with respect to the display direction in the example shown in FIG. 3, but when they are also arranged in the vertical direction, the steps are preferably provided also on the upper and lower side walls.

FIGS. 4A and 4B show an example in which projections 3a and 3d are formed on the upper and lower outer peripheral walls of the reflection case 3. FIG. In this example, the convex portion 3d provided on the upper outer peripheral wall is composed of two convex portions, and the convex portion provided on the lower outer peripheral wall is one convex portion. By recognizing the number of convex portions, the upper and lower portions can be confirmed. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

On the other hand, this type of light-emitting display device is inserted and transported in dozens of units in an elongated plastic tube, but conventionally, the light-emitting display device has an end on the display surface side of the reflective case and an end on the bottom surface thereof. Since the display is performed while being supported, there is a problem that the edge of the display surface is rubbed and the black paint or the like coated on the surface is peeled off, thereby deteriorating the display quality. However, according to the example shown in FIG. 4, as shown in FIG. 4C, a cross-sectional explanatory view of a state in which the light emitting display device 5 is inserted into the tube 6, a convex portion provided at a lower portion of the outer peripheral wall. 3a is sandwiched between protrusions 61 and 62 provided on one inner wall of the tube 6, and a straight line provided on another opposed inner wall of the tube 6 between two protrusions 3d provided on the upper part of the outer peripheral wall. The protrusion 63 is formed so as to be fitted,
The light-emitting display device can be held on the side wall part which is completely unrelated to the display surface.

FIG. 5 is a view showing still another embodiment in which the shape of the concavo-convex portion is changed. In this example, an intermediate portion of the reflection case 3 is formed in a shape shifted vertically and horizontally.
That is, in the example shown in FIG. 5, in the middle part of the reflective case 3, the upper part is formed in the convex part 3f, the lower part is formed in the concave part 3e, the left part is formed in the convex part 3f, and the right part is formed in the concave part 3e. Have been. By recognizing the upper or left convex portion, the direction of the uneven portion can be immediately known. On the other hand, by forming such uneven portions, when the light emitting display devices are arranged in the horizontal or vertical direction, the convex portions 3f can be fitted with the concave portions 3e of the adjacent light emitting display devices. By fitting a required number of digit indicators in advance, they can be integrated into a single unit and can be directly mounted on a circuit board or the like.

It is to be noted that, if necessary, the convex portion 3f and the concave portion 3e
Is formed in a tapered shape, it is possible to fit more firmly. In addition, in the case of arranging the leads vertically, in the figure, each lead end extending in the up-down direction is bent outwardly in the gull wing shape, but it is necessary to form inward. However, in the case of arranging only in the horizontal direction, this is not necessary, and the uneven portion may be formed only in the left and right horizontal directions. Furthermore, by adopting such a fitting structure,
Light leakage between the adjacent light emitting display devices described above can be blocked to prevent erroneous display due to light leakage. FIG.
In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

In each of the above examples, each lead is led up and down with respect to the display surface. However, the same applies to a light emitting display device having a structure led out to the left and right, and is also shown in FIG. Even in such a conventional structure, the unevenness is provided on the outer surface of the reflection case, so that the vertical relationship can be easily determined.

[0033]

According to the present invention, the vertical direction of a light-emitting display device, which tends to be almost point-symmetrical in external form, can be recognized very easily, and mounting on a circuit board or the like becomes very easy. Furthermore, the unevenness is formed by a step portion, or formed so as to correspond to the protrusion in the transfer tube,
By forming such that adjacent light emitting display devices can be fitted together, it is possible to prevent erroneous display due to light leakage from a gap between adjacent light emitting display devices, and prevent damage to the display surface during transport. can do.

Further, each lead is led out in the vertical direction,
Since the tip is bent so that it is parallel to the bonding surface, it can be manufactured inexpensively using a lead frame. In the case of assembling, mounting by an automatic machine becomes possible, and it can be mounted on a board at high productivity and at low cost. Further, when the gap between the lead and the through hole is too large as in the case of the through hole, the problem that the soldering is not completely performed is eliminated, and the reliability of the soldering is greatly improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating one embodiment of a light emitting display device according to the present invention.

FIG. 2 is an example of a lead frame of the display device shown in FIG.

FIG. 3 is a diagram illustrating another embodiment of the light emitting display device according to the present invention.

FIG. 4 is a view illustrating still another embodiment of the light emitting display device according to the present invention.

FIG. 5 is a diagram illustrating still another embodiment of the light emitting display device according to the present invention.

FIG. 6 is a perspective view illustrating a conventional light emitting display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead 2 LED chip 3 Reflection case 3a, 3d Convex part 3b, 3c Step part 4 Translucent resin

Claims (5)

[Claims] 1. A plurality of light emitting elements for respectively lighting a part of a display image, a plurality of leads to which the light emitting element is die-bonded or wire-bonded to one end, and a light guide corresponding to a part of the display image Part is formed,
A reflective case that covers the part to be bonded;
The light guide section of the reflection case includes the light emitting element, and is made of a translucent resin that is filled in the reflection case so as to fix one end side of the plurality of leads. A light-emitting display device comprising a concavo-convex portion formed on at least a part of an outer peripheral side wall portion of the light-emitting device. 2. The reflection case, wherein the shape of the display surface of the display image on the display surface is substantially rectangular, and steps are formed on at least left and right side walls with respect to the display direction.
The light-emitting display device according to claim 1, wherein the light-emitting display devices are arranged so that a part of the reflective case is overlapped and arranged between the light-emitting display devices arranged side by side. 3. The tube for carrying a light-emitting display device, wherein the reflection case has a substantially rectangular shape on the display surface of the display image, and the concave and convex portions are formed at least in an upper part and a lower part or right and left with respect to the display direction. The light-emitting display device according to claim 1, wherein the uneven portion is formed so as to be able to engage with one or a plurality of linear protrusions formed on a side wall of the light-emitting device. 4. The reflection case, wherein the shape of the display surface of the display image on the display surface is substantially rectangular, and irregularities are formed at least on the left and right with respect to the display direction. The light-emitting display device according to claim 1, wherein a concave portion and a convex portion are formed on the left and right so as to be fitted. 5. The plurality of leads are led to upper and lower portions of the reflection case with respect to a display direction of the display image, and are bent substantially perpendicularly to the surface to be bonded, and the other ends are provided. 5. The light-emitting display device according to claim 1, wherein the light-emitting display device is further bent at a side so as to be substantially parallel to the surface to be bonded.