JPH11149262A - White light emitting element, and lighting display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify or eliminate adjustment for bare tips colored simultaneously to provide white color, to improve yield, and to provide pure white display with low power consumption and reduced heating. SOLUTION: This element is a white light emitting element 1 for providing white color by carrying current plural bare tips to mix colors.The element 1 is provided with two bare tips 2, 3 different in emitting light colors, a mounting substrate 5 for mounting the bare tips 2, 3 neighboring to a mounting part, and a reflector 6 having a reflection face 6a for reflecting to a prescribed direction an optical axis at the time of current carrying to the bare tips 2, 3 so as to mix colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white light-emitting element and a light-emitting display unit used for various light-emitting displays, and more particularly to a technique capable of emitting white light with a small number of bare chips.

[0002]

2. Description of the Related Art In various public facilities such as hospitals, libraries, city halls, courts, etc., and railway or road facilities, electronic bulletin boards for continuously displaying or scrolling and displaying desired information have become widespread. ing. In public facilities such as hospitals, libraries, city halls, and courts, there is a growing demand for white display instead of conventional red or orange.

According to these electronic bulletin boards, in order to display alphanumeric characters or simple Chinese characters on a flat display surface, for example, an electronic display unit having 16 or more dots arranged in the vertical and horizontal directions is desired. A number of them are prepared, and they are arranged side by side with no gap therebetween to form a flat display surface of the electronic bulletin board.

[0004] On the other hand, in a large electronic signboard in various large public facilities, an apparatus has been put into practical use in which white display is possible by simultaneously energizing three primary color (RGB) light emitting elements. In such a large electronic bulletin board, for example, a desired number of electronic display units each having a flat display section in the vertical and horizontal directions are prepared, and the flat display surface of the electronic bulletin board is configured by arranging them in parallel with no gap therebetween. I am trying to do it.

However, since the above-described electro-optical display unit is for forming a flat display surface, for example, when a curved surface is formed in a convex annular shape, a gap is not easily formed between the attached units. Since it becomes empty, the display quality is reduced.

Accordingly, the applicant of the present invention has disclosed Japanese Patent Application Laid-Open No. 09-161.
Japanese Patent Application Laid-Open No. 07-2007 discloses a light-emitting display unit in which a light-emitting element arranged along a curved surface is mounted on a bendable mounting substrate and a reflector is provided on the light-emitting element.

[0007]

According to the above-mentioned electro-optical display unit, white display is achieved by simultaneously energizing the three primary color (RGB) light-emitting elements.

FIG. 4 is a perspective view showing the appearance of a conventional LED light emitting device 100 for white display. As shown in FIG.
In the D light emitting element 100, four soldering leads are integrally formed on a resin base 101, and red (R), green (G), and blue (B) are formed from the upper ends of the leads via lead wires. Bare chip 102 that develops color, 1
03 and 107 are respectively wired. In addition, base 10
1 has a cap 106 formed of a clear resin having a convex lens function so as to be covered with a cap 106 to obtain a finished product. It is configured to emit white light by performing color mixing by simultaneous energization of the LEDs.

However, for example, the LED shown in FIG.
According to the light emitting element, it is difficult to adjust the luminance of the bare chips 102, 103, and 107 that simultaneously emit red (R), green (G), and blue (B) in order to obtain white light, and there is a problem that it is difficult to achieve a balance. Therefore, there was a problem that the yield was deteriorated. Further, since more power is required, a problem of heat generation has been pointed out.

[0010] Therefore, the present invention has been made in view of the above-mentioned problems, and the adjustment of bare chips which are simultaneously colored to obtain white color can be easily or unnecessary, the yield is improved, and the power consumption is reduced. It is an object of the present invention to provide a white light emitting element and an electric light display unit capable of displaying pure white with less heat generation.

When a plurality of electronic display units are arranged adjacent to each other so as to form a flat surface or a curved surface along at least one surface direction, kanji information can be displayed without deteriorating the display quality. It is an object of the present invention to provide an electro-optical display unit capable of inexpensively manufacturing each component including a reflector when the electronic apparatus is configured to electronically display desired information including a wide viewing angle.

[0012]

According to the present invention, there is provided a white light-emitting device which obtains white by mixing colors by energizing a plurality of bare chips. Bare chips of different luminescent colors, a mounting board for mounting the bare chip adjacent to the mounting portion, and an optical axis disposed on the mounting portion and energizing the bare chip so as to perform the color mixing. A reflector having a reflecting surface for reflecting light in a predetermined direction.

The bare chip of the two different colors emits light by the mixed color, and the chromaticity coordinate is x = 0.3.
It is characterized in that it is selected from combinations in which white light emission is obtained in the vicinity of 1, y = 0.32.

One of the bare chips is blue with a color development wavelength of 460 to 480 nm (nanometers), and the other of the bare chips is green with a color development wavelength of 540 to 550 nm (nanometers).

Further, one of the bare chips is a blue color having a coloring wavelength of 460 to 480 nm (nanometers), and the other of the bare chips is a yellow-green color having a coloring wavelength of 550 to 570 nm (nanometers). .

Further, one of the bare chips is blue with a coloring wavelength of 460 to 480 nm (nanometers), and the other of the bare chips is yellow with a coloring wavelength of 570 to 585 nm (nanometers).

Further, one of the bare chips is blue with a coloring wavelength of 460 to 480 nm (nanometers), and the other of the bare chips is orange with a coloring wavelength of 585 to 590 nm (nanometers). .

Further, one of the bare chips is blue with a coloring wavelength of 460 to 480 nm (nanometers), and the other of the bare chips is red with a coloring wavelength of 590 to 640 nm (nanometers).

[0019] Further, there is provided an electric light display unit used for electric light display in which a plurality of the white light emitting elements are juxtaposed in an adjacent state, and a mounting board for mounting the white light emitting elements vertically and horizontally in a matrix. A circuit board connected to the mounting board to drive the light emitting elements in lines and columns,
A reflector having the concave reflecting surface provided so as to insert the white light emitting element.

Further, the white light-emitting elements are juxtaposed in a plurality of adjacent states along at least one surface direction so as to form a convex or concave curved surface, and are used for electric light display. A unit, formed as a frame having the curved surface, adjacent frame bases, a plurality of mounting substrates provided for mounting the white light emitting elements vertically and horizontally equally in a matrix, and A circuit board connected to the mounting board for line and column driving of the element, and having a concave reflecting surface provided so as to be inserted into the white light emitting element, and having a total length along the curved surface. And a reflector that is injection-molded while being configured to be divided by a width dimension that is divided by an integer and that prevents the reflection surface from being under in the molding die. It is characterized in that integrally assembled and said frame member and said mounting substrate and said circuit board reflector.

Further, the present invention is characterized in that, by individually energizing one or the other of the bare chips of the white light emitting element, light emission of a color other than the mixed color is performed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a central sectional view of the white light emitting element 1, which is a minimum unit showing a configuration in which white is mixed by energizing two bare chips, and can be used alone. Although the circuit configuration for energization is omitted in this drawing, energization is performed via a circuit pattern formed on a mounting board, which will be described later.

First, in FIG. 1 (a), bare chips 2 and 3 of two different luminescent colors are mounted on a mounting substrate 5 by a reflecting surface of a reflector 6 injection-molded from white polycarbonate resin as a predetermined resin material. It is mounted so as to be located at the mounting portion in the through hole formed in 6 a, and can be individually energized via the lead wire 4.

In the above configuration, when the bare chips 2 and 3 are simultaneously energized so as to perform mixed-color light emission, FIG.
As shown in the figure, the light emission optical axis (shown by a broken line) is reflected by the reflection surface 6a to perform color mixing, thereby enabling white light emission close to pure white.

The bare chips 2 and 3 of the two different colors used in this manner emit white light with x = 0.31 and y = 0.32 near the chromaticity coordinates in FIG. Is selected from

Specifically, the bare chip 2 has a coloring wavelength of 4
60 to 480 nm (nanometer) blue, bare chip 3 has a coloring wavelength of 540 to 550 nm (nanometer)
Can be used.

The bare chip 2 has a coloring wavelength of 460.
~ 480nm (nanometer) blue, bare chip 3
A yellow-green color having a coloring wavelength of 550 to 570 nm (nanometers) can be used.

The bare chip 2 has a coloring wavelength of 460.
~ 480nm (nanometer) blue, bare chip 3
A yellow color having a color development wavelength of 570 to 585 nm (nanometer) can be used.

The bare chip 2 has a coloring wavelength of 460.
~ 480nm (nanometer) blue, bare chip 3
Can be used which has an orange color of 585 to 590 nm (nanometer).

The bare chip 2 has a coloring wavelength of 460.
~ 480nm (nanometer) blue, bare chip 3
A red color having a color development wavelength of 590 to 640 nm (nanometer) can be used.

By using the above combination, it is possible to emit white light by monochromatic light emission and mixed color.
In this case, white light emission in the range indicated by the range W and white light emission close to the pure white indicated by the range PW can be performed.

As a result, since only two adjustments of bare chips are needed to obtain a white color at the same time, the adjustment is simple or unnecessary, and the product yield can be improved. Further, pure white display can be performed with low power consumption and low heat generation.

FIG. 3 is an exploded perspective view of the electronic display unit 50. FIG. In this figure, the same reference numerals are given to the components already described in FIG. 1 and the description thereof is omitted. For example, the single electronic display unit 50 can display Chinese characters for a 16-dot matrix. Unit 50
Are provided adjacent to each other so as to be in a line as shown in the figure, whereby white kanji can be displayed. Further, a shift register may be built in the drive circuit board 20 so that the display can be displayed so as to move left and right.

Further, as disclosed in Japanese Patent Application Laid-Open No. 09-16107, by disposing a white light emitting element along a convex or concave curved surface, endless display becomes possible, and a 360-degree visual field can be obtained. Can be provided. However, one unit may be provided as a play to clearly indicate where the display starts.

Further, by adjoining the light-emitting display unit 50 so as to form a concave curved surface, it is possible to perform a display in which the field of view is widened. For example, as shown in FIG. You will be able to get a natural 360 degree field of view.

Therefore, for example, n
2πR ÷ n = L (Equation 1) in order to arrange the parts in a circle
Each lightning display unit 50 is configured to have a width L along the curved surface determined from the above, for example, it is possible to display a 16-dot matrix kanji character by one, and the width L along the arc (however, the lightning display unit (Length 1 is also a square, so the vertical dimension is also L.) It is possible to use a total of 16 light-emitting display units 50 of 96 mm in length and display a 360-degree viewing angle for one round.

The electronic bulletin board completed in this manner is suspended from the ceiling for display in a hospital or the like, or is appropriately installed such that a pillar is provided from the center.

Further, the width dimension L of each light-emitting display unit 50
Can be set as appropriate, and can be configured smaller and larger than this. Needless to say, the present invention is not limited to the above dimensions, and is not limited to the above-described viewing angle of 360 degrees. By setting the angle to 180 degrees, 270 degrees, or the like, it can be directly attached to a wall surface.

[0040]

As described above, according to the present invention, the adjustment of bare chips which are simultaneously colored to obtain a white color can be easily or unnecessary, and the yield is improved, and the power consumption and heat generation are reduced. It is possible to provide a white light emitting element and an electric light display unit capable of displaying pure white.

When a plurality of electronic display units are arranged adjacent to each other along at least one surface direction so as to form a flat surface or a curved surface, the kanji information can be displayed without deteriorating the display quality. When the electronic device is configured to electronically display desired information including a wide viewing angle, it is possible to provide an electronic display unit that can manufacture each component including the reflector at low cost.

[0042]

[Brief description of the drawings]

FIG. 1 is a sectional view of a white light emitting element.

FIG. 2 is a chromaticity diagram.

FIG. 3 is an exploded perspective view of the electric light display unit 50.

FIG. 4 shows a conventional LED light emitting device 100 for white display.
It is an external appearance perspective view of.

[Explanation of symbols]

 1 white light emitting element, 2 bare chip, 3 bare chip, 4 lead wire, 5 mounting board, 6 reflector, 6a anti-slope 50 lightning display unit

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[Procedure amendment]

[Submission date] December 3, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

Claims (10)

[Claims] 1. A white light-emitting element that obtains white by mixing colors by energizing a plurality of bare chips, comprising: a bare chip of two different luminescent colors; and a mounting board for mounting the bare chip adjacent to a mounting portion; A white light-emitting element, comprising: a reflector disposed on the mounting portion and having a reflection surface that reflects an optical axis in a predetermined direction when the bare chip is energized so as to perform the color mixing. 2. A bare chip having a luminescent color different from the two colors, x = 0.31 in chromaticity coordinates due to the color mixture.
The white light emitting device according to claim 1, wherein the white light emitting device is selected from combinations in which white light emission around y = 0.32 is performed. 3. One of the bare chips has a coloring wavelength of 4
3. The white light emitting device according to claim 2, wherein the color of the bare chip is blue at 60 to 480 nm (nanometer) and the color of the bare chip is green at 540 to 550 nm (nanometer). 4. 4. One of the bare chips has a coloring wavelength of 4
3. The white light emitting device according to claim 2, wherein the color of the bare chip is blue at 60 to 480 nm (nanometer), and the other of the bare chips is yellowish green at 550 to 570 nm (nanometer). 4. 5. One of the bare chips has a coloring wavelength of 4
3. The white light emitting device according to claim 2, wherein the color of the bare chip is blue at 60 to 480 nm (nanometer) and the color of the other bare chip is yellow at 570 to 585 nm (nanometer). 4. 6. One of the bare chips has a coloring wavelength of 4
The blue color of 60 to 480 nm (nanometers) and the other of the bare chips are orange with a color development wavelength of 585 to 590 nm (nanometers).
3. The white light-emitting device according to item 1. 7. One of the bare chips has a coloring wavelength of 4
3. The white light emitting device according to claim 2, wherein the color of the bare chip is blue at 60 to 480 nm (nanometer), and the other color of the bare chip is red at 590 to 640 nm (nanometer). 4. 8. An electric light display unit used for electric light display in which a plurality of the white light emitting elements are juxtaposed in a juxtaposed state, wherein: a mounting substrate for mounting the white light emitting elements vertically and horizontally in a matrix; A circuit board connected to the mounting substrate for driving the light emitting element in line and column, and a reflector having the concave reflecting surface provided so as to insert the white light emitting element. Characteristic lightning display unit. 9. An electro-optical display used for electro-optical display in which a plurality of said white light-emitting elements are juxtaposed and adjacent to each other along at least one surface direction so as to form a convex or concave curved surface. A unit, formed as a frame having the curved surface and adjacent to each other, a plurality of mounting substrates provided for mounting the white light emitting elements vertically and horizontally equally in a matrix; A circuit board connected to the mounting board for line and column driving of the element, and having a concave reflecting surface provided so as to be inserted into the white light emitting element, and having a total length along the curved surface. And a reflector that is injection-molded while being configured to be divided by a width dimension divided by an integer and preventing the reflection surface from being under in the molding die, Sign display unit, characterized in that integrally assembled serial frame and said mounting substrate and said circuit board and said reflector. 10. The color emission other than the mixed color is performed by individually energizing one or the other of the bare chips of the white light emitting element.
An electric light display unit according to any one of the above.