JP2004259730A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device in which the light source of a light emitting element and the optical axis of a light guide plate can be positioned accurately at the time of manually mounting the light emitting element on a display substrate. <P>SOLUTION: The projecting section 6 of the light emitting element A is utilized for positioning the element A at the time of fixing the element A on the display substrate 3. A positioning hole 7 into which at least part of the projecting section 6 is inserted for positioning the optical axis 9 of a light emitting section 1 is provided at the location where the light emitting element A is set up on the display substrate 3. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device having a light emitting element, and more particularly, to a display device which is mounted on various devices and displays an operation state and the like.
[0002]
[Prior art]
2. Description of the Related Art A display device equipped with a light-emitting element represented by a light-emitting diode is used as a display unit for indicating a state of operation or the like in various devices such as an air conditioner. In recent years, display devices have been required to be reduced in size and complicated in structure due to higher density of devices and improvement in design.
[0003]
Among them, there are cases where the distance between the display unit of the device and the light emitting unit of the light emitting element on the display substrate has to be increased due to restrictions on the mechanism and design of the device. In this case, all the light of the light emitting element is not guided to the display unit, and sufficient brightness cannot be obtained. As one means for solving this problem, there is a method of guiding light of a light emitting element to a remote display unit via a light guide plate.
[0004]
In this method, it is necessary to align the optical axes of the light emitting element and the light guide plate as much as possible so that light from the light source of the light emitting element soldered on the display substrate is guided to the light guide plate without leakage. To this end, it is necessary to mount the light emitting element on the display substrate at an accurate position and accurately determine the positional relationship between the two.
[0005]
As a display device including a light emitting element, a display substrate, and a light guide plate, a configuration as shown in FIG. 4 can be considered. As shown in the figure, in order to align the light emitting portion 1 of the light emitting element A with the optical axis 9 of the light guide plate 2, it is necessary to accurately determine the position of the light emitting portion A of the light emitting element A on the display substrate 3. As a conventional positioning method, as shown in FIG. 5A, the lead wire 4 on the light emitting element light emitting unit side is shortened on the display substrate 3, the movable range of the light emitting unit 1 is narrowed, and the optical axis 9 is fixed. .
[0006]
However, in such a configuration, the optical axis of the light emitting element is fixed in a direction substantially perpendicular to the display substrate, and a design problem that a space is required between the display substrate 3 and the display unit 8 arises.
[0007]
On the other hand, as shown in FIG. 5B, by bending the lead wire 4 of the light emitting element on the light emitting element light emitting portion side of the display substrate 3 by about 90 degrees, the optical axis 9 of the light emitting element and the display substrate 3 are made parallel. The space between the mounting surface of the display unit 8 and the display substrate 3 can be reduced. That is, in FIG. 5, the distance L1 between the display substrate 3 and the display unit 8 is larger than the distance L2.
[0008]
As described above, in a state where the light emitting element is fixed in a direction substantially perpendicular to the display substrate, the design of the device is restricted. That is, in order to set the optical axis in an arbitrary direction, it is necessary to bend the lead wire on the light emitting element light emitting portion side of the display substrate to reduce the space for mounting the light emitting element A on the display substrate surface, such as miniaturization of the product. It is effective in terms of.
[0009]
In order to satisfy this requirement, as a conventional technique, by providing a holding device for fixing the position of the light emitting element on the display substrate, by fixing the light axis of the light emitting element with the lead wire of the light emitting element bent. An invention in which an optical axis is set in an arbitrary direction is disclosed (Patent Document 1).
[0010]
[Patent Document 1]
JP-A-8-191192
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the number of holding devices must be increased, which leads to an increase in cost and man-hours for assembly. Furthermore, since it is difficult to use a mounting machine when performing soldering in a state where the lead wires of the light emitting element are bent in a direction parallel to the display substrate, so-called manual mounting in which the light emitting element is manually mounted is performed. Although it is performed, since positioning is performed visually to align the light source of the light emitting element with the optical axis of the light guide plate, positioning using a jig such as a ruler leads to an increase in man-hours and a decrease in assembly accuracy. Could be
[0012]
The present invention is to solve the above-mentioned conventional problem, and performs positioning by manually mounting a light emitting element having a lead wire on a light emitting element light emitting portion side on a display substrate of a display device so that an optical axis of a light guide plate and a light emitting element are aligned. It is an object of the present invention to provide a low-cost, low-man-hour, high-assembly-accuracy display device.
[0013]
[Means for Solving the Invention]
In order to solve the above-mentioned conventional problems, a display device of the present invention includes a projection provided on a light emitting element light emitting part and a part of a projection provided on a display substrate at a place where the light emitting element light emitting part is installed. Or it has a positioning hole into which all can be inserted.
[0014]
The position of the light emitting portion of the light emitting element is fixed by inserting the projection of the light emitting element into the positioning hole, and the lead wire of the light emitting element parallel to the display substrate is bent at the position of the soldering hole on the display substrate. Then, a lead wire is inserted into the soldering hole and soldering is performed on the solder surface. This enables accurate positioning of the light emitting element on the display substrate. Since the light emitting element is accurately positioned on the display substrate, the light guide plate and the light emitting element are aligned with each other in optical axis, and a display device with as little light leakage as possible to the display unit is configured.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
According to a first aspect of the present invention, there is provided a display device including: a light emitting element having a light emitting portion, a projection, and a lead; And a display substrate having a groove portion. With this configuration, when assembling the display device, the projection of the light emitting element is fitted and positioned in the first groove, so that the optical axis of the light emitting element is fixed in a predetermined direction with a simple configuration. And assembling accuracy is improved.
[0016]
Further, in the display device according to claim 2 of the present invention, the light emitting element having the light emitting portion, the protrusion, and the lead, and the hole into which the lead wire of the light emitting element is inserted and welded, and the protrusion are fitted and positioned. A display substrate having a first groove portion, and a light guide portion fixed directly or indirectly to the display substrate and guiding light emission of the light emitting element to a predetermined location. . With this configuration, the light emitted from the light emitting element can be guided by the light guide, and the degree of freedom of the arrangement portion can be improved in the designed display device, and the light from the light emitting element can be more accurately transmitted to the light guide. Can be guided.
[0017]
The display device according to a third aspect of the present invention is the display device according to the first or second aspect, wherein the second light emitting portion is positioned substantially in the optical axis direction of the light emitting element by communicating with the first groove portion. Characterized by having a groove portion. Thus, when assembling the display device, the light emitting element can be positioned using not only the protrusion but also the light emitting portion, so that the optical axis can be more accurately fixed, which is preferable.
[0018]
Further, the display device according to claim 4 of the present invention is characterized in that the display device includes an urging means for urging the light emitting element from above the mounting surface of the display substrate to fit the projection into the first groove. At the time of assembly, at least the protrusion is fitted into the first groove to perform positioning, and then the lead wire of the light emitting element is bent to configure the light emitting element in a predetermined posture. It is preferable to use an urging means in order to prevent the displacement from occurring. The biasing means may be formed as a separate part, may be provided on a part of the protective cover of the display means, or may be provided on a movable lid. It suffices if it is possible to prevent the protrusion from floating from the first groove by contacting and urging.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
(Embodiment 1)
FIG. 1 is a schematic diagram of a configuration of a display device according to Embodiment 1 of the present invention, in which a light emitting diode (hereinafter, referred to as an LED) is used as a light emitting element.
[0021]
As shown in FIG. 1A, the LED (A) has a substantially bullet-shaped light-emitting portion 1 and a cylindrical protrusion 6 having the same center line as the light-emitting portion and a large radius connected to the light-emitting portion 1. And a lead wire 4 for guiding the current to the light emitting unit and fixing the same to the substrate. The LEDs on the display substrate 3 are designed such that the optical axis 9 and the surface of the display substrate 3 are substantially parallel. The display substrate 3 includes a light emitting element protrusion positioning groove 7 for fixing the position when the protrusion 6 is fitted therein, and a light emitting element lead wire soldering through hole 5 into which a light emitting element lead wire is inserted. The light emitting element projecting portion positioning groove 7 is also positioned near the soldering through hole 5 with respect to the optical axis 9 of the LED so that the projecting portion 6 formed in a brim shape substantially perpendicular to the optical axis 9 of the LED is fitted. It is formed in a substantially vertical slot shape.
[0022]
Then, when assembling the display device, first, the lead wire 4 of the LED (A) is inserted into the through hole 5 for soldering, and then the lead wire 6 is fitted so that the LED protrusion 6 is fitted into the light emitting element protrusion positioning groove 7. 4, the position of the light emitting portion 1 of the LED is fixed, and then the length of the lead wire 4 is adjusted and soldering is performed on the solder surface. As a result, the LED is accurately positioned on the display substrate 3, and the light of the LED can be guided to the light guide plate without leakage. The brightness of the display unit 8 is easily made uniform as designed.
[0023]
Also, as shown in FIGS. 1A and 1B, the light emitting element light emitting portion positioning groove 12 is continuous with the light emitting element protrusion positioning groove 7 so that the surface side of the light emitting portion 1 of the LED near the display substrate 3 is easily positioned. It is provided.
[0024]
The light emitting element projecting portion positioning groove 7 and the light emitting element light emitting portion positioning groove 12 may be holes penetrating the display substrate, or may have a dug groove shape. In short, it suffices if it can be positioned by fitting with the protrusion 6.
[0025]
Further, as shown in FIGS. 1B and 1C, it is preferable that an urging member 13 is provided so that the LED is securely fitted into the light emitting element protrusion positioning groove 7 and the light emitting element light emitting section positioning groove 12. . The urging member 13 has a contact portion 13a for urging the LED, and may be fixed to the display substrate by using a claw 13b or the like.
[0026]
(Embodiment 2)
Next, a second embodiment will be described with reference to FIG. FIG. 2 is a schematic side view of an indoor unit of an air conditioner equipped with the display device of the present invention. In the figure, a display substrate 3 is provided on a display substrate installation part 10a provided integrally with a main body front frame 10, and the light of the LED is transmitted by a light guide plate 2 mounted on a front panel 11 of the air conditioner. 11 to the display unit 8.
[0027]
The light guide plate 2 is made of, for example, a material such as acrylic, polycarbonate, or PET, and is fixed to the front panel 11, and the front panel 11 is positioned relative to each other by a rotatable fitting portion (not shown). ing.
[0028]
Even in such a configuration, since the LED (A) is positionally fixed to the light guide plate 2 via the display substrate 3, the front frame 10, and the front panel 11, the LED (A) emits light with the optical axis aligned as much as possible. More light can be guided to the display unit 8.
[0029]
【The invention's effect】
As described above, according to the present invention, when a light emitting element is manually mounted on a display substrate, the position can be accurately determined, and a base for fixing the optical axis of the light emitting element is not required, and The work of positioning using a jig such as a ruler can be omitted, and cost and man-hour can be reduced.
[Brief description of the drawings]
FIG. 1A is an assembled perspective view of a display device according to a first embodiment of the present invention; FIG. 1B is a schematic side view of the display device according to a surface configuration according to the first embodiment of the present invention; FIG. FIG. 2 is a schematic view illustrating a configuration of a biasing member according to the first embodiment of the invention.
FIG. 3 is a schematic side view of a display device according to Embodiment 2 of the present invention used in an air conditioner. FIG. 3 is a schematic view of a conventional display device. FIG. (B) Schematic configuration of another display device using a conventional light guide plate [Description of reference numerals]
A light emitting element 1 light emitting element light emitting section 2 light guide plate 3 display substrate 4 lead wire 5 through hole for soldering light emitting element lead wire 6 light emitting element protrusion 7 light emitting element protrusion positioning groove (first groove)
8 display unit 9 optical axis of light emitting element 10 front frame 11 of air conditioner indoor unit front panel 12 of air conditioner indoor unit 12 light emitting element light emitting unit positioning groove (second groove)
13 urging member

Claims (4)

A light emitting element having a light emitting portion, a projection, and a lead wire; and a display substrate having a hole into which the lead wire of the light emitting element is inserted and welded, and a first groove in which the projection is fitted and positioned. A display device comprising: A light emitting element having a light emitting part, a protrusion and a lead wire, a display substrate having a hole into which the lead wire of the light emitting element is inserted and welded, and a first groove in which the protrusion is fitted and positioned; A display device comprising: a light guide that is directly or indirectly fixed to a display substrate and guides light emitted from a light emitting element to a predetermined place. The display device according to claim 1, further comprising a second groove communicating with the first groove to position the light emitting unit in a substantially optical axis direction of the light emitting element. The display according to claim 1, further comprising an urging unit that urges the light emitting element from above the installation surface of the display substrate to fit the protrusion into the first groove. apparatus.

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