JP5297472B2 - Display panel device using light emitting diode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display panel device in which lens bodies make emitted light close to almost complete white, which comprises a panel substrate 1, a plurality of blue light-emitting diodes 2 mounted on the surface of the panel substrate 1, and the lens bodies 6 made of transparent synthetic resin for covering the blue light-emitting diodes, respectively, wherein a fluorescent material, which emits yellow light by being excited with blue light emitted from a blue light-emitting diode, is mixed in the transparent synthetic resin in the lens bodies. <P>SOLUTION: A correction-light-emitting diode 7 is mounted inside each lens body 6, and lights together with the blue light-emitting diode 2 so as to emit light to convert blue light emitted from the blue light-emitting diode to white light. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention is a panel in which a large number of light emitting diodes are arranged in a matrix on the surface of a panel substrate, and characters or figures are displayed by emitting light from any of the light emitting diodes. It relates to the device.

  Conventionally, in this type of display panel device, as described in, for example, Patent Document 1 and Patent Document 2, each of the light-emitting diodes mounted on the surface of the panel substrate is replaced with the brightness and durability of the light-emitting diode. For the purpose of improving the properties, the lens is sealed with a transparent synthetic resin lens body.

  Further, conventionally, the lens body in each of the light emitting diodes is swelled into an approximately hemispherical shape by dropping an appropriate amount of transparent synthetic resin in a liquid state on the upper surface of the panel substrate. It is made to form by hardening | curing with (refer the said patent document 1, patent document 2, etc.).

  By the way, in the above-described conventional panel device, a blue light emitting diode is used for each light emitting diode, while the transparent synthetic resin in the lens body of each light emitting diode is excited by blue light emitted from the blue light emitting diode. By mixing fluorescent materials that emit yellow light, each of the lens bodies can emit white light by mixing blue light from a blue light emitting diode and yellow light emitted from the fluorescent material. That is, the display panel device can be configured as a white light emitting display panel device.

JP 61-144890 A JP 2003-258313 A

  As described above, the configuration of the white light emitting display panel device has the following problems.

  That is, each lens body emits white light based on the blue light in the blue light emitting diode only due to the fluorescent material mixed in the lens body. When the amount of the fluorescent material is small, white light emission is performed. When blue light emission approaches blue light emission and the amount of the fluorescent material is large, white light emission approaches yellow light emission.

  However, in the conventional panel device, each lens body is formed by dripping (potting) an appropriate amount of liquid transparent synthetic resin as described above. Not only does the amount of the synthetic resin fluctuate so that it increases or decreases, but also the density of the fluorescent material mixed in it varies, and the amount of fluorescent material contained in one lens body due to these fluctuations. In addition, since a large number of small variations can be achieved, the color variation can be achieved in the white light emission of each lens body.

For this reason, it is not only difficult to make a plurality of panel devices emit white light of the same color, but it is also difficult to emit a uniform white light even with a single panel device. There was a problem.

  An object of the present invention is to solve this problem and to provide a panel device in which each lens body uniformly emits white light.

In order to achieve this technical problem, claim 1 of the present invention provides:
“On the surface of the panel substrate, a large number of blue light-emitting diodes are mounted in a matrix, and a lens body made of a transparent synthetic resin is provided to cover each of the blue light-emitting diodes separately. In a display panel device comprising a synthetic resin mixed with a fluorescent material that emits yellow light when excited by blue light emitted from the blue light emitting diode,
A correction light emitting diode that emits light that turns on together with the blue light emitting diode and converts blue light in the blue light emitting diode into white light is mounted on an inner portion of each lens body of the panel substrate. Further, the blue light emitting diode is disposed at the center of the lens body as viewed from the direction perpendicular to the surface of the panel substrate, and the correction light emitting diode is disposed at a position shifted from the center of the lens body. It was configured to be . "
It is characterized by that.

Claim 2 of the present invention includes:
“In the first aspect of the present invention, two correction light emitting diodes are provided, and the two correction light emitting diodes are disposed on both the left and right sides of the blue light emitting diode.”
It is characterized by that.

Claim 3 of the present invention provides:
“In the description of claim 1, the number of the light-emitting diodes for correction is three or more, and the plurality of light-emitting diodes for correction are arranged at equal locations on the circumference centered on the blue light-emitting diode. Arrange. "
It is characterized by that.

Claim 4 of the present invention provides:
“Light emission amount changing means according to any one of claims 1 to 3, wherein one or both of the light emission amount of the blue light emitting diode and the light emission amount of the correction light emitting diode in each lens body is changed. Is equipped. "
It is characterized by that.

Claim 5 of the present invention provides:
“In claim 4, the light emission amount changing means is performed separately for each of the lens bodies.”
It is characterized by that.

Claim 6 of the present invention provides:
“In claim 4 or 5, the light emission amount changing means is means for changing a blinking cycle in each light emitting diode or means for changing a voltage to each light emitting diode.”
It is characterized by that.

A correction light-emitting diode that emits light that is lit together with each blue light-emitting diode and converts blue light in the blue light-emitting diode into white light in an inner portion of each lens body of the panel substrate. By mounting, for the blue light emitted from the blue light emitting diode, both the yellow light from the fluorescent material excited by the blue light and emitting light and the light emitted from the correction light emitting diode are By mixing the colors, the lens body emits white light.

  That is, according to the present invention, since the blue light in the blue light emitting diode is converted into white light emission by both the fluorescent material and the correction light emitting diode, the variation in the emission color depending on the amount of the fluorescent material is achieved. Can be made much smaller than when relying solely on the fluorescent material as in the prior art, so that each lens body can be made to be almost completely white light emission.

  In this case, each lens body is provided with only one correction light emitting diode in addition to the blue light emitting diode. The correction light emitting diode is disposed on the opposite side of the lens body across the blue light emitting diode. The amount of light in the area where it is not provided will be insufficient.

  On the other hand, the present invention proposes the configuration described in claim 2, and with this configuration, the amount of light in both the left and right regions of the lens body with the blue light emitting diode interposed therebetween can be made uniform. it can.

  In particular, with the configuration according to the third aspect, the entire lens body can emit light with the same amount of light.

  On the other hand, according to the configuration described in claim 4, when the blue light emitted from the blue light emitting diode is stronger and the white light emission from the lens body is bluish as a whole in the light emission state, the light emission amount is reduced. By changing means, the light emission amount in the blue light emitting diode is decreased, the light emission amount in the correction light emitting diode is increased, or the light emission amount in the blue light emitting diode is decreased to reduce the light emission amount in the correction light emitting diode. By controlling to increase the light emission amount, it is possible to approach white light emission.

  Also, when the blue light emitted by the blue light emitting diode is weaker and the white light emission in the lens body is yellowish as a whole, is the light emission amount changing means increasing the light emission amount in the blue light emitting diode? Alternatively, the light emission amount in the correction light emitting diode is decreased, or the light emission amount in the blue light emitting diode is increased so as to decrease the light emission amount in the correction light emitting diode, so that white light emission is achieved. You can get closer.

  Thereby, the light emission in each lens body can be made more complete white light emission.

  In this case, as described in claim 5, the light emission amount changing means is configured to be performed separately for each of the lens bodies, so that each lens body among one panel device is connected to each other. It is possible to correct the variation in white light emission.

  Note that changing the light emission amount of the light emitting diodes is to change the blinking cycle when the lighting of each light emitting diode is repeatedly blinked at a very short interval. In addition, it can be easily realized by changing the voltage for each light emitting diode.

It is a perspective view which shows a part of panel apparatus by 1st Embodiment. FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. FIG. 3 is a plan view taken along line III-III in FIG. 2. It is a figure which shows 2nd Embodiment. It is a figure which shows 3rd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show a first embodiment.

  In these drawings, reference numeral 1 denotes an insulating panel substrate.

  On the surface of the panel substrate 1, a large number of blue light emitting diodes 2 are mounted in a matrix with the same pitch interval in the vertical and horizontal directions.

  Each blue light emitting diode 2 is die-bonded to the surface of the first individual electrode pattern 3 formed in advance on the surface of the panel substrate 1, while the first individual electrode pattern is formed on the surface of the panel substrate 1. 3 is electrically connected to a common electrode pattern 4 formed in a ring shape so as to surround 3 by wire bonding using a thin metal wire 5.

Further, each of the blue light emitting diodes 2 is sealed with a lens body 6 made of a transparent synthetic resin such as epoxy resin and having a substantially hemispherical shape . In a plan view (FIG. 3) viewed from a direction perpendicular to the surface, it has a circular shape.

In this case, the lens body 6 having the substantially hemispherical shape has the center of the lens body 6 located in the blue light emitting diode 2 in the plan view (FIG. 3). In other words, the blue light emitting diode 2 is located at the center of the lens body 6.

  Further, the lens body 6 is preliminarily dropped (potted) in a liquid state with a transparent synthetic resin mixed with an appropriate amount of a fluorescent substance so as to rise to the surface of the panel substrate 1 and then cured. It is formed by doing.

  The fluorescent material emits yellow light when excited by blue light emitted from the blue light emitting diode 2.

A correction light emitting diode 7 is mounted on a portion of the surface of the panel substrate 1 in each lens body 6, and the correction light emitting diode 7 is perpendicular to the surface of the panel substrate 1. In a plan view (FIG. 3) viewed from the direction, the lens body 6 is located at a position deviated from the center of the circle.

  The correction light emitting diode 7 is lit together with the blue light emitting diode 2 and emits light (for example, yellow light emission) that converts blue light in the blue light emitting diode 2 into white light. Die-bonded to the second individual electrode pattern 8 formed inside the ring-shaped common electrode pattern 4 and electrically connected to the common electrode pattern 4 by wire bonding with a thin metal wire 9. Yes.

  Of course, the correction light-emitting diode 7 is located inside the lens body 6 and sealed by the lens body 6, similarly to the blue light-emitting diode 2.

Each of the first individual electrode pattern 3, the common electrode pattern 4 and the second individual electrode pattern 8 is led to the lower side of the panel substrate 1 through the through holes 10, 11, 12 penetrating the panel substrate 1. The first individual electrode pattern 3 and the common electrode pattern 4 are connected to the first lighting control circuit 13 for the blue light emitting diode 2, while the common electrode pattern 4 and the second individual electrode pattern 8 are used for the correction. The blue light emitting diode 2 and the correction light emitting diode 7 are turned on together by connecting to the second lighting control circuit 14 for the light emitting diode 7.

  Further, the first lighting control circuit 13 includes a light emission amount changing means for the blue light emitting diode 2 to turn on and off the blue light emitting diode 2 and at the same time increase or decrease the light emission amount of the blue light emitting diode 2. The light emission amount increase / decrease adjustment is performed by changing the voltage, or the blue light emitting diode 2 is turned on and off repeatedly at very short intervals. In this case, the flashing cycle is changed.

  Further, the second lighting control circuit 14 includes a light emission amount changing means for the correction light emitting diode 7 so that the correction light emitting diode 7 is turned on and off, and at the same time, the light emission amount of the correction light emitting diode 7 is adjusted. The light emission amount increase / decrease adjustment is performed by changing the voltage, or the correction light emitting diode 7 is turned on and blinking at a very short interval. Is repeated by changing the blinking cycle.

  In this configuration, for the blue light emitted from the blue light emitting diode 2 inside each lens body 6, the yellow light from the fluorescent material that emits light when excited by the blue light, and the inside of the lens body 6 similarly. As a result, both the light emitted from the correction light emitting diode 7 (for example, yellow light emission) is mixed and the lens body 6 emits white light as a whole.

  That is, since the blue light in the blue light emitting diode 2 is changed to white light emission by both the fluorescent material and the correction light emitting diode 7, the variation in the emission color due to the amount of the fluorescent material is reduced. Since the lens body 6 can be made much smaller than the conventional case where it depends only on the fluorescent material, each lens body 6 can be brought close to almost perfect white light emission.

  The panel device having this configuration can display characters, figures, or the like by emitting light only from an arbitrary lens body among the lens bodies 6 on the surface of the panel substrate 1.

  In the light emission of each lens body 6, when the blue light from the blue light emitting diode 2 is stronger and the white light emission in the lens body 6 is generally bluish, the first lighting control circuit 13 Decreasing the amount of light emitted from the blue light emitting diode 2, increasing the amount of light emitted from the correction light emitting diode 7 by the second lighting control circuit 14, or by using both the lighting control circuits 13 and 14, By controlling the blue light emitting diode 2 to decrease the light emission amount and increase the light emission amount of the correction light emitting diode 7, it is possible to approach white light emission.

  Further, when the blue light emitted from the blue light emitting diode 2 is weaker and the white light emission from the lens body 6 is yellowish as a whole, the light emission amount of the blue light emitting diode 7 is controlled by the first lighting control circuit 13. Or the amount of light emitted from the light-emitting diode 7 for correction is reduced by the second lighting control circuit 14, or the amount of light emitted from the blue light-emitting diode 2 by the two lighting control circuits 13, 14. By controlling so that the amount of light emitted from the light-emitting diode 7 for correction is decreased to increase white light, it is possible to approach white light emission.

In this case, the control of the light emission amount in one or both of the blue light emitting diode 2 and the correction light emitting diode 7 in the one lens body 6 is performed simultaneously for all the lens bodies 1 in one panel substrate 1. However, each lens body 6 can be configured separately.

  In this way, by adjusting the increase / decrease of the light emission amount of the light emitting diodes 2 and 7 in each lens body 6 for each lens body 6, each lens body in one panel device can be adjusted. The variation in white light emission among the six can be corrected.

  Next, FIG. 4 shows a second embodiment.

  In the second embodiment, two light emitting diodes 7 for correction in the one lens body 6 are provided, and the two light emitting diodes 7 for correction are arranged on both the left and right sides of the blue light emitting diode 2. is there.

  With this configuration, the amount of light in the region can be aligned on both the left and right sides of the lens body 6 with the blue light emitting diode 6 interposed therebetween.

  FIG. 5 shows a third embodiment.

  In the second embodiment, three or more correction light emitting diodes 7 in the one lens body 6 are provided, and the plurality of correction light emitting diodes 7 are arranged at the center of the lens body 6. This occurs at an equally divided location on the circumference around the blue light emitting diode 2.

  With this configuration, the entire lens body 6 can emit light with the same amount of light.

DESCRIPTION OF SYMBOLS 1 Panel board | substrate 2 Blue light emitting diode 3 1st separate electrode pattern 4 Common electrode pattern 5, 9 Metal wire 6 Lens body 7 Correction light emitting diode 8 1st separate electrode pattern 10, 11, 12 Through hole 13 1st lighting control circuit 14 Second lighting control circuit

Claims (6)

A large number of blue light emitting diodes are mounted in a matrix on the surface of the panel substrate, and a lens body made of a transparent synthetic resin that covers each of the blue light emitting diodes separately is provided. In a display panel device comprising a resin mixed with a fluorescent material that is excited by blue light emitted from the blue light emitting diode to emit yellow light,
A correction light emitting diode that emits light that turns on together with the blue light emitting diode and converts blue light in the blue light emitting diode into white light is mounted on an inner portion of each lens body of the panel substrate. Further, the blue light emitting diode is disposed at the center of the lens body as viewed from the direction perpendicular to the surface of the panel substrate, and the correction light emitting diode is disposed at a position shifted from the center of the lens body. A display panel device using a light emitting diode, characterized in that it is configured as described above .   2. The light-emitting diode according to claim 1, wherein two light-emitting diodes for correction are provided, and the two light-emitting diodes for correction are arranged on both left and right sides of the blue light-emitting diode. Display panel device.   3. The correction light emitting diode according to claim 1, wherein the number of the correction light emitting diodes is three or more, and the plurality of correction light emitting diodes are arranged at equally divided locations on the circumference centering on the blue light emitting diode. A display panel device using a light emitting diode.   The light emission amount changing means according to any one of claims 1 to 3, wherein one or both of the light emission amount of the blue light emitting diode and the light emission amount of the correction light emitting diode in each lens body is changed. A display panel device using a light emitting diode, comprising:   5. A display panel device using a light emitting diode according to claim 4, wherein the light emission amount changing means is performed separately for each of the lens bodies.   The light emission amount changing means according to claim 4 or 5, wherein the light emission amount changing means is means for changing a blinking cycle in each of the light emitting diodes, or means for changing a voltage to each of the light emitting diodes. Display panel device using light emitting diodes.

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