JP2008230512A - On-board surrounding air temperature indication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively manufacture a display device for informing a presence or non-presence of frozen state at a road surface during running by using a light emitting segment capable of displaying different colors having a less amount of radiance unevenness and irregular color. <P>SOLUTION: A contour shape of light emitted display is formed by a display window 171a that is a segment where no mask sheet material is printed. A phosphor is not arranged near a second LED 120B. A light shielding frame 140 is formed into an annular shape and a part of its ring is concave inwardly in a lateral V-shape. A separator 140a is constituted by this V-shaped concave part. This separator 140a is present among a first LED 120W, its peripheral sealing resin and a second LED 120B emitting blue light so as to prevent blue light outputted from the second LED 120B from being directly struck against a sealing resin 150. Due to this fact, output light from the second LED 120B is not directly incident on the phosphor mixed in the sealing resin 150. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-vehicle outside temperature display device that detects an outside temperature of a vehicle and displays the detected temperature on a front panel of a cabin, for example.

  As a vehicle display device that displays whether or not there is a risk of road surface freezing, for example, a vehicle display device described in Patent Document 1 below is known. In this conventional vehicle display device, a portion that is likely to be frozen on the road surface is illustrated to the driver using a special projection means (head-up display) on the windshield of the vehicle. .

Moreover, as a configuration form of the light emitting segment of the light emitting display device using the LED, for example, those described in Patent Document 2 below are known. In this prior art, a light-emitting diode is enclosed by an annular surrounding portion made of a light-transmitting resin, and the light-emitting diode is sealed by pouring a light-transmitting sealing resin into the ring. That is, in this prior art, the LED disposed in a predetermined frame is sealed with a translucent sealing resin containing a phosphor, and the phosphors are made to emit fluorescence in the frame. A desired light emitting display shape is formed, and according to this prior art, the contour shape of a desired light emitting segment can be arbitrarily and easily formed by the shape of its frame (enclosed portion).
JP 2006-243888 JP 2006-66786 A

  However, the display means (head-up display) described in Patent Document 1 is extremely disadvantageous in terms of manufacturing cost, vehicle mountability, and the like because the device is very large. Therefore, the inventor of the present application has come up with the idea of simply notifying the driver that there is a risk of freezing on the running road surface by changing the display color when displaying the outside air temperature on the front panel of the cabin.

  However, if the light-emitting segment is configured based on the conventional technique described in Patent Document 2, only the light emission luminance of the portion immediately above the location where the LED is disposed is significantly higher than the other portions. Therefore, depending on the size and shape of the light emitting segment, the number of LEDs mounted, and the like, there arises a problem that it is difficult to visually recognize one light emitting segment as a group of light emitting displays without uneven brightness.

  Further, when manufacturing an LED light-emitting display device, there is a demand for reducing the manufacturing cost as much as possible by reducing the types of LEDs to be used (self-luminous colors, models, etc.) as much as possible. However, even when the above-described conventional technology is applied, if only the same type of LED that outputs only one kind of light emission color is used, even if a phosphor is used as in the conventional case, it is apparent on one light emitting segment. Different colors cannot be displayed. It is also difficult to avoid color unevenness.

  The reason for this is that when a plurality of same-type LEDs (LEDs having the same emission color) are used on one light-emitting segment, even if a configuration in which phosphors are locally unevenly distributed only around one LED, This is because when another LED emits light, the light emitted from the other LED easily enters the phosphor. For this reason, when only the same type of LED that outputs only one kind of emission color is used, even if a phosphor is used as in the prior art, it is difficult to perform emission display without color unevenness over a plurality of colors. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to use an LED display device having a light-emitting segment capable of displaying different colors with less luminance unevenness and color unevenness at different timings. In other words, a display device for informing whether or not there is a risk of freezing of the road surface during traveling is manufactured at low cost.

In order to solve the above problems, the following means are effective.
That is, the first means of the present invention is an in-vehicle outside air temperature display device that detects and displays an outside air temperature of a vehicle, and an outside air temperature detecting means for detecting the outside air temperature of the vehicle, and a plurality of light emission colors LED light-emitting display device that displays the outside air temperature by the light-emitting segment to be switched, road surface freezing estimation means for estimating whether or not the road surface being frozen is frozen, and the display color of the outside air temperature based on the estimated road surface state A display color determining means for determining, and the LED light-emitting display device emits light independently from the first LED that emits light while emitting fluorescent light from the phosphors arranged in the vicinity. The second LED, the light-shielding mask sheet material that is arranged on the light-emitting segment and masks the contour shape of the light-emitting display of the light-emitting segment, and the light emission of the second LED is the fluorescent light A light-shielding separator that separates the second LED placement region and the phosphor placement region and a light diffuser that constitutes the light-emitting portion of the light-emitting segment. And a light-shielding frame that surrounds the sealing resin from the side, and the phosphor, the first LED, and the second LED are masked with the mask sheet material. It is arranged in the masked area.

However, the purpose of determining the display color of the outside air temperature based on the estimated road surface condition by the display color determining means is to inform the driver that the vehicle is in a state where it is likely to slip or the possibility. For example, such a warning can be made by changing the display color of the outside air temperature to white or the like during normal times and changing the display color of the outside temperature to blue or the like when the road surface is frozen. However, the arrangement of these colors may be arbitrary.
The separator and the light-shielding frame are preferably masked with the mask sheet material as much as possible. If the part that is not masked with the mask sheet material is in the separator or the light-shielding frame, The upper end exposed at least above the part is preferably black or dark.
Moreover, the light emission color and light emission peak wavelength of said 1st LED and 2nd LED do not necessarily need to be the same, You may use LED from which light emission color differs clearly. Moreover, the mounting form of each LED may be arbitrary, and may be by flip chip mounting or by wire bonding.

Further, the orientation of the LED may be arbitrarily set such as horizontal (horizontal), vertical (vertical), or diagonal, but it is arranged so that a large amount of light is output in the horizontal direction to diffuse light in the sealing resin. It is desirable that the body reflects light in that direction upward. However, it is desirable to employ an LED using a thick sapphire substrate that is advantageous for light extraction in the lateral direction, particularly when mounted face-up or face-down.
Moreover, you may light up said 1st LED and 2nd LED simultaneously. The lighting timing control (ON / OFF control) is arbitrary.

According to a second means of the present invention, in the first means, the first and second LEDs are blue light emitting LEDs, and the phosphor is a fluorescent light that converts blue light into yellow light. It is to make a body.
Moreover, the third means of the present invention further comprises overheat prediction means for predicting occurrence of overheating of the engine of the vehicle in the first or second means, and the light emitting segment includes the above-mentioned A third LED having a different emission color from the first and second LEDs is provided.

According to a fourth means of the present invention, in any one of the first to third means, the light shielding frame is made of a black or dark material.
According to a fifth means of the present invention, in any one of the first to fourth means, the back surface of the mask sheet material is a reflecting surface made of a reflecting member, a reflecting agent, or a paint having a reflecting action. It is to form with.

According to a sixth means of the present invention, in any one of the first to fifth means, the light-shielding frame is formed from a resin that is applied to the upper surface of the wiring board and cured in a partition shape. That is.
According to a seventh means of the present invention, in any one of the first to fifth means, the filling region of the sealing resin is formed from an internal space of the through hole formed in the flat substrate. By configuring, the bottom surface of the filling region is configured from the upper surface of the wiring substrate bonded in a laminated manner, and the light-shielding frame body is configured by the side wall portion of the through hole. is there.

According to an eighth means of the present invention, in any one of the first to seventh means, a reflecting member, a reflecting agent, or a reflecting action is provided on at least a part of the bottom surface or side surface of the sealing resin. It is to provide the paint which plays.
By the above means of the present invention, the above-mentioned problem can be effectively or rationally solved.

The effects obtained by the above-described means of the present invention are as follows.
That is, according to the first means of the present invention, it is possible to inform the driver of the possibility of freezing of the road surface during traveling only by changing the display color of the display unit that displays the outside air temperature. The apparatus structure of the alarm display unit can be configured very simply. For example, by changing the display color of the outside air temperature to blue or light blue when the road surface is frozen, the situation can be appealed to the driver's senses. Can be made. For this reason, according to the first means of the present invention, a road surface freezing alarm display device can be configured at a very low cost.

  Further, according to the first means of the present invention, each light emission of the phosphor, the first LED, and the second LED hits the light diffuser and is indirectly extracted upward and directly extracted upward. There is nothing. That is, the phosphor, the first LED, and the second LED arranged in the masked region cannot be directly visually observed from the outside, and only their indirect light can be viewed through the sealing resin. For this reason, the site | part which becomes remarkably high-intensity locally in the light emission display area | region of a light emission segment does not exist. That is, there is no particular unevenness in the light emission luminance distribution over the entire light emitting segment, and the luminance distribution is generally stabilized to be substantially constant. For this reason, according to the 1st means of this invention, the light emission display of one light emission segment can be visually recognized as one light emission display.

Further, when the first LED is turned on and the second LED is turned off, the substantially uniform mixed color in which the colors of the fluorescent light emission of the phosphor and the light emission of the first LED are well mixed is Is output upward from the sealing resin. In addition, when the second LED is turned on and the first LED is turned off, the emitted light hardly enters the phosphor due to the light-shielding action of the separator, so that almost no mixed color is generated. Instead, the self-luminous color of the second LED is output from the sealing resin as it is.
For this reason, even if the first LED and the second LED are LEDs having the same emission color, the emission color of the emission segment can be variably controlled according to the timing, and the conventional color There is no unevenness. In addition, even when the first LED and the second LED have different emission colors, the light emission of the second LED does not directly enter the phosphor. The self-luminous color of the LED can be output upward from the sealing resin as it is.

Therefore, according to the first means of the present invention, it is possible to switch and output a plurality of light emission colors (mixed color and self-light emission color) with less luminance unevenness and color unevenness according to timing in one light emitting segment.
In addition, even if the first LED and the second LED are composed of the same LED, a plurality of colors with little luminance unevenness and color unevenness can be changed depending on the timing to emit light. Can reduce the manufacturing cost of the LED light emitting display device including the light emitting segment whose emission color changes depending on the timing.
In addition, due to the action of the light diffuser mixed in the sealing resin, the LED light-emitting display device of the present invention can obtain high visibility even when the light-emitting display portion (light-emitting segment) is oblique. In particular, when the first LED and the second LED are turned on at the same time, a higher-luminance light-emitting display of another new mixed color can be performed on the light-emitting segment.

  In particular, according to the second means of the present invention, two colors of blue and white can be output using only the same LED that emits blue light, so that blue (self-luminous color) and white ( A light-emitting segment having a variable emission color that emits light in any one of at least two of (mixed colors) can be constructed at low cost. Further, particularly when the first LED and the second LED are turned on at the same time, an even brighter bluish light emitting display can be performed on the light emitting segment.

  Further, according to the third means of the present invention, when the occurrence of engine overheating is predicted, the outside air temperature can be displayed by the light emitting segment that emits light of the self-light emitting color of the third LED. . For this reason, according to the third means of the present invention, the driver can be informed of the situation where the engine overheat is predicted to occur by the self-luminous color of the third LED together with the outside air temperature.

In addition, according to the fourth means of the present invention, the light of each light emitting segment does not leak into the sealing resin of the adjacent light emitting segment, and the outline of the light emitting display is not easily blurred. A light-emitting display can be realized.
According to the fifth means of the present invention, the light hitting the back surface of the mask sheet material is reflected by the sealing resin and effectively reused without being absorbed by the mask sheet material. Therefore, the light extraction efficiency is improved.
According to the sixth means of the present invention, the light shielding frame can be easily formed on the upper surface of the wiring board. That is, the application of the resin forming the light-shielding frame can be performed, for example, by screen printing or using a dispenser.

  Further, according to the seventh means of the present invention, for example, by providing a through-hole in a plate-like base material and disposing the LED in each hole with the internal space of the hole as the LED mounting portion, The light-shielding frame can be formed accurately and easily. In addition, if the entire upper surface of the wiring board is uniformly colored with, for example, a fluorescent paint or a white paint in advance, the above-mentioned plate-like base material is layered on the surface and joined to form a layer of LED light. It is also possible to easily form a reflecting member that favorably reflects light from a sealing resin having a light diffuser.

  Further, according to the eighth means of the present invention, light emitted from the phosphor and the LED is not absorbed by the member in contact with the side surface or the bottom surface of the sealing resin, and the light is reflected in the sealing resin. Therefore, the light extraction efficiency is improved.

  Note that the road surface freezing estimation means is a means for determining the possibility of the road surface on which the vehicle is traveling being frozen, such as, for example, Japanese Patent Laid-Open No. 2005-306305 and Japanese Patent Laid-Open No. 2005-306305. It can be easily configured based on the prior art disclosed in 2006-243888.

Hereinafter, the present invention will be described based on specific examples.
However, the embodiments of the present invention are not limited to the following examples.

In FIG. 1, the logical block diagram of the vehicle-mounted outside temperature display apparatus 300 of the present Example 1 is shown. The on-vehicle outside temperature display device 300 displays the outside temperature of a vehicle on which the on-vehicle outside temperature display device 300 is mounted in the outside temperature display area 210 of the LED light emitting display device 200 whose display format is illustrated in FIG. The outside air temperature T is detected by the outside air temperature detecting means 311 shown in FIG.
The road surface freezing estimation means 312 in FIG. 1 is a means for determining the degree of possibility that the road surface on which the vehicle is traveling is frozen, and when the possibility of freezing is determined to be higher than a predetermined threshold value. The output signal S1 is set to 1. When it is determined that the possibility of freezing is lower than a predetermined threshold, the output signal S1 is set to zero.

  The display pattern editing unit 320 is a unit that edits a display pattern of light emission display information (such as the outside air temperature T) to be displayed in the outside air temperature display area 210 of the LED light emitting display device 200. It is composed of a computer (not shown) having a ROM, a RAM, an input / output interface, and the like. Moreover, the display color determination means 321 and the lighting LED selection means 322 of FIG. 1 are implement | achieved by the below-mentioned program (FIG. 6) which operates this computer. The control signal that uniquely defines the display pattern is transferred from the display pattern editing unit 320 to the LED driver 330, and the desired display pattern is changed to the outside air of the LED light emitting display device 200 by power supply from the LED driver 330. This is realized on the temperature display area 210.

  FIG. 2 is a front view of an LED light-emitting display device 200 that is a part of the in-vehicle outside temperature display device 300. The outdoor temperature display area 210 is provided in the central portion of the LED light-emitting display device 200, and theoretically, an arbitrary temperature within the range of −9 ° C. to 99 ° C. can be obtained by two seven segments 211. It is possible to display with 1 to 2 digits.

  FIG. 3 shows an enlarged view of the double 7-segment 211. The mask sheet material 171 is formed from a black silicon resin printed on a translucent resin sheet, and the thickness thereof is about 0.2 mm. The outline shape of the light emitting display of the light emitting segment 100 constituting the so-called 7 segment for displaying Arabic numerals and the like is formed by the display window 171a which is a portion where the mask sheet material 171 is not printed. The reflected light from the light diffuser mixed in the sealing resin 160 passes through the inside of the display window 171a and is emitted to the outside.

FIG. 4 shows a cross-sectional view of the light emitting segment 100 described above. This sectional view is a drawing before the assembly of the light emitting segment 100. After the assembly, the light reflecting agent 172 approaches the light shielding frame 140 and the mask sheet material 171 approaches the colored resin 180 in the vertical direction. Thus, the positional relationship is mutually joined.
The mask sheet material 171 is printed on the upper surface of the translucent resin sheet 170, and light is favorably reflected downward on the back surface of the resin sheet 170 located below the mask sheet material 171. A light reflecting agent 172 is applied. Further, the mask sheet material 171 and the display window 171a are covered with a plate-like light-transmitting colored resin 180. The colored resin 180 is for preventing incident light from the outside from entering the sealing resin 160 through the display window 171a. The sealing resin 160 made of translucent silicon is mixed with particles of a light diffuser made of titanium oxide (TiO _x ), and the blue light output from the first LED 120W emitting blue light is the light. It is indirectly discharged to the outside through the sealing resin 160 containing the diffuser.

  Layered lead electrodes 111 and 112 made of copper (Cu) are formed on the upper surface 110a of the insulating substrate 110 made of glass epoxy material (FR-4) having a thickness of 1.2 mm, and the back surface of the first LED 120W. Is bonded to the lead electrode 112 by a die bond material 131 made of silver paste. The first LED 120 </ b> W is obtained by stacking a group III nitride compound semiconductor semiconductor layer on a sapphire substrate, and its p-electrode is electrically connected to the lead electrode 111 by a bonding wire 132. Further, the n electrode is electrically connected to the lead electrode 112 by a bonding wire 133. In addition, the lead electrode 112 is connected to the wiring pattern 115 made of copper (Cu) formed on the back surface of the insulating substrate 110 through the filling metal 114 filled in the through hole 110 c formed in the insulating substrate 110. It is connected. An insulating film 116 made of silicon is formed on each part of the exposed surface of the wiring pattern 115 and the back surface 110 b of the insulating substrate 110. This insulating film 116 is for preventing an unexpected short circuit related to the wiring pattern 115.

  The LED 120W is sealed in two stages using a translucent silicon resin. The first stage is sealed with a sealing resin 150 made of a translucent silicon resin containing a particulate phosphor. The phosphor contained here is Ce: YAG (yttrium / aluminum / garnet-based fluorescent agent), which can convert the wavelength of blue light into yellow light. Since the mask sheet material 171 is present on the upper part of the sealing resin 150, the sealing resin 150 and the first LED 120 </ b> W cannot be viewed from above the colored resin 180.

On the other hand, the second-stage sealing is performed by the sealing resin 160 described above. Therefore, the output light radiated from the sealing resin 150 to the outside is white, which is a mixed color of blue light and yellow light, and most of the output light is reflected by the light diffuser and displayed. It passes through the window 171a and is taken out above the colored resin 180.
The resin film 113 is obtained by screen-printing black silicon resin on the upper surface 110a of the insulating substrate 110 or the upper surfaces of the lead electrodes 111 and 112, and the light-shielding frame body 140 thereon is black coated with a dispenser. Made of silicon resin. A reflective agent 141 is applied on the side wall surface of the light shielding frame 140 on the side in contact with the sealing resin 160.

  FIG. 5 shows a plan view of the light emitting segment 100 described above. This plan view shows a state before performing the wire bonding and the above-described sealing process, and the resin film 113 is not shown for easy understanding. The cross section of FIG. 4 shows the AA ′ cross section in FIG. 5. In FIG. 5, the second LED 120B in the present invention is arranged symmetrically with respect to the first LED 120W. However, the second LED 120B is sealed in one step only by the sealing resin 160 described above. For this reason, a fluorescent substance is not arrange | positioned in the vicinity of 2nd LED120B.

  The light-shielding frame 140 is formed in an annular shape, and a part of the ring is recessed inward in a lateral V-shape. The separator 140a is composed of the V-shaped recess, and is formed of the same material and the same method as the light-shielding frame 140 at the same time. The separator 140a is interposed between the sealing resin 150 and the second LED 120B that emits blue light, and prevents the blue light output from the second LED 120B from directly hitting the sealing resin 150. . For this reason, the output light from the second LED 120 </ b> B does not directly enter the phosphor mixed in the sealing resin 150.

  Therefore, when the second LED 120B is lit, only the blue light reflected by the light diffuser contained in the sealing resin 160 is output from the inside of the display window 171a of FIGS. 3 to 5 to the outside. Is done. In addition, when the first LED 120W is lit, the blue light reflected by the light diffuser contained in the sealing resin 160 and the above-mentioned yellow light after wavelength conversion are mixed, and the white light is mixed. The image is output to the outside from within the frame of the display window 171a.

Therefore, if this light emitting segment 100 is used, any of white light emitting display and blue light emitting display can be arbitrarily selected and implemented. For this reason, in the LED light-emitting display device 200 according to the first embodiment, the problem of uneven color at the time of conventional blue display does not occur. Further, according to the above structure, the phosphors mixed in the first and second LEDs (120W, 120B) and the sealing resin 150 are all arranged in the masked area masked by the mask sheet material 171. Therefore, when the LED light emitting display device 200 is visually observed, a portion having a locally high light emission intensity does not exist in the frame of the display window 171a. For this reason, according to the configuration of the first embodiment, it is possible to realize a light emitting display device with less unevenness in light emission intensity.
In addition, since the same blue light emitting diode can be used for the first LED 120W and the second LED 120B, the manufacturing cost of the LED light emitting display device 200 can be reduced.

FIG. 6 shows a flowchart of a program for realizing the display pattern editing means 320 described above. First, in step S110, the outside air temperature T and the output signal S1 are input from the outside air temperature detecting unit 311 and the road surface freezing estimating unit 312.
Next, in step S120, the value of the output signal S1 is determined. If the value is 1 (: the possibility of road surface freezing is high), the process proceeds to step S140, and if not, the process proceeds to step S150.

  In each of steps S140 and S150, a color code CL for designating the display color of the display pattern output to the outside air temperature display area 210 is set. For example, the character code 'B' designated as the color code CL in step S140 indicates that blue display is performed. The character code 'W' in step S150 indicates white display. In other words, the above-described steps S120, S140 and S150 constitute the display color determining means 321 shown in FIG.

  Next, in step S170, the outside air temperature T to be displayed is converted into a 1-digit or 2-digit integer (-9 to 99), and based on the value, the individual light-emitting segments 100 to be lit and displayed (FIG. 3). Select each. At this time, if the character code set in the color code CL is 'W', the first LED 120W of the light emitting segment 100 to be lit corresponding to the display pattern is selected. If the character code is 'B', the second LED 120B of the light emitting segment 100 to be lit corresponding to the display pattern is selected. And based on those selection, the control signal for lighting each LED is produced | generated. That is, this step S170 corresponds to the above-mentioned lighting LED selection means 322 (FIG. 1).

Next, in step S180, the LED driver 330 is activated by transferring the generated control signals to the LED driver 330.
Then, after step S180 is executed, the process returns to the first step S110, and the above process is periodically repeated. The repeated control cycle may be arbitrary.

  According to the above control procedure, when there is a risk of road surface freezing, the display pattern such as the outside temperature T displayed in the outside temperature display area 210 of the LED light emitting display device 200 is displayed by blue light emission. In other normal times, these display patterns are displayed in white. Therefore, according to this on-vehicle outside temperature display device 300, the road surface freezing estimation information can be accurately notified to the driver of the vehicle as needed by the color of the outside temperature displayed in the outside temperature display area 210.

  Further, instead of the blue display described above, for example, blue and white may be alternately lit. Or you may make it repeat light extinction and lighting periodically, changing lighting color alternately like blue-> white-> light extinction-> blue-> white-> light extinction -.... According to the lighting control of these LEDs, the possibility of freezing the road surface can be notified to the driver of the vehicle even more effectively.

FIG. 7 shows a logical configuration diagram of the on-vehicle outside temperature display device 301 of the second embodiment. This on-vehicle outside temperature display device 301 is an extension of the on-vehicle outside temperature display device 300 of the first embodiment, and an overheat prediction means 313 is newly provided in parallel with the road surface freezing estimation means 312. The point is the biggest feature. The overheat predicting means 313 is a means for determining the possibility of overheating of the engine of the vehicle. When it is determined that the possibility is higher than a predetermined threshold, the output signal S2 is set to 1. And When it is determined that the possibility is lower than the predetermined threshold, the output signal S2 is set to zero. Such a predicting means can be easily configured based on, for example, conventional techniques disclosed in Japanese Utility Model Laid-Open Nos. 7-8747 and 6-146893.
The LED light-emitting display device 201 is a display device similar to the LED light-emitting display device 200 (FIG. 2) of the first embodiment, but here, the light-emitting segment 101 (three-color display described below) ( 8) is used, the LED light-emitting display device 201 is driven to emit light by an LED driver 331 compatible with three-color display.

  FIG. 8 shows a plan view of the light emitting segment 101 of Example 2 used in the LED light emitting display device 201 described above. The light-emitting segment 101 has a structure obtained by slightly expanding the light-emitting segment 100 of Example 1. As can be seen by comparing FIG. 5 with FIG. 8, the light-emitting segment 101 of Example 2 has a red color. A third LED 120R that emits light is further provided. The back surface of the third LED 120R is bonded to the upper surface of the lead electrode 112 ′ by die bonding similar to that of the first LED 120W, and the lead electrode 112 ′ is similar to the lead electrode 112 in the upper surface of the insulating substrate. It consists of a copper film laminated on 110a. The lead electrode 112 ′ is electrically connected to the n-electrode of the third LED 120 R by a bonding wire 133.

  Further, in the main light-emitting segment 101, a part of the light-shielding frame 140 on the right side (extended portion 140b) in FIG. 8 is curved outwardly (right side) so as to include the third LED 120R. As a result of this expansion, a new expansion region is provided as a masked region on the right side within the ring of the light-shielding frame 140 in FIG. 8 and outside the frame of the display window 171a. Yes. Most of the region of the lead electrode 112 'is formed in a main portion that occupies the center of the extended region. As with the light-shielding frame 140, the reflective agent 141 shown in FIG. The inner wall surface of the extended portion 140b forms a concave surface having a substantially quadratic curve shape as shown in FIG. Here, the third LED 120 </ b> R is desirably arranged on the focal point of the quadratic curve in order to favorably disperse the light emission throughout the light emitting segment 101, but this is not always necessary.

  According to the configuration of the light emitting segment 101, the light emitting segment 101 emits white light when only the first LED 120W is turned on, and emits blue light when only the second LED 120B is turned on. When only the LED 120R is lit, it emits red light. And even if the red light output from 3rd LED120R directly injects into the fluorescent substance contained in the sealing resin 150 of FIG. 4, the fluorescent substance does not make it light-emit. Further, all these three LEDs are arranged in a maximum area outside the frame of the display window 171a. Therefore, in this light emitting segment 101, at least three colors of white, blue, and red can be displayed without uneven color and luminance. The combination of these lightings is also arbitrary, and if such combination lighting is performed, any mixed color can be displayed without uneven color and uneven brightness by superimposing light emission based on the same action. .

  FIG. 9 shows a flowchart of a program for realizing the display pattern editing unit 320 ′ of FIG. This program is an extension of the program of FIG. 6 of the first embodiment, and the output signal S2 is added to the input information in step S110 ′. Further, since step S130 for determining this value is added, if S2 = 1, a code 'R' designating red display is set in the above-described color code CL in step S160. Is done. These processes implement the display color determining means 321 ′ shown in FIG.

In the next step S170 ′ (322 ′), the outside air temperature T to be displayed is converted into a one-digit or two-digit integer (−9 to 99), and the individual light emission to be displayed by light emission based on the value. Each segment 101 is selected. At this time, if the character code set in the color code CL is “W”, the first LED 120W of the light emitting segment 100 to be lit corresponding to the display pattern is selected. If the character code is 'B', the second LED 120B of the light emitting segment 100 to be lit corresponding to the display pattern is displayed. If the character code is 'R', the light emitting segment to be lit corresponding to the display pattern is displayed. 101 third LEDs 120R are respectively selected. And based on those selection, the control signal for lighting each LED is produced | generated.
Next, in step S180 ′, the LED driver 331 is activated by transferring the generated control signals to the LED driver 331.

According to the above control procedure, when there is a risk of road surface freezing, a display pattern such as the outside temperature T displayed on the LED light emitting display device 201 is displayed by blue light emission. Further, when the engine is likely to overheat, a display pattern such as the outside air temperature T is displayed by red light emission. In other normal times, these display patterns are displayed in white.
Therefore, according to this on-vehicle outside air temperature display device 301, road surface freezing estimation information, overheating prediction information, and the like can be accurately notified to the driver of the vehicle as needed by the color of the displayed outside air temperature. In addition, in any of the light emission displays of red display, blue display, and white display, color unevenness and luminance unevenness do not occur, and therefore, display of the outside air temperature with extremely excellent visibility can be performed at all times.

  FIG. 10 illustrates another modification of the light emitting segment 100 of the first embodiment. That is, FIG. 10 is a cross-sectional view of the light emitting segment 102 of Example 3 in which the previous light emitting segment 100 is slightly modified. Among the reference numerals in FIG. 10, the same reference numerals as those in FIG. 4 indicate the same parts as in FIG. The main differences between the light emitting segment 102 and the light emitting segment 100 are the following two points.

(Difference 1) The filling region of the sealing resin 160 is formed from the internal space of the through-hole formed in the flat resin base 145. That is, the application surface of the reflective material 141 corresponds to the inner wall surface of the through hole, and the bottom surface of the filling region is formed on the upper surface 110a of the wiring substrate 110 to which the base material 145 is laminated and bonded. Has been. And the light-shielding frame body which encloses the sealing resin 160 from the side and holds it by the base material 145 which comprises the side wall part of this through-hole is comprised.
(Difference 2) The sealing resin 151 made of a translucent silicon resin does not contain a phosphor, and the phosphor layer 155 is formed on the exposed surface of the sealing resin 151 after the curing process by coating. A film is formed.

  For example, as in the light emitting segment 102 described above, the light shielding frame body that encloses and holds the sealing resin 160 from the side can be formed also by a drilling process on the base material 145. Further, according to the above configuration, the phosphor layer 155 can be formed very thin and uniformly, and thus, the light emission (photon that is emitted to the outside after colliding with the phosphor many times more than necessary. ) And the light emission efficiency of the light emitting segment 102 is improved.

  Note that the first LED 120W in FIG. 10 is obtained by crystal-growing a semiconductor layer 122 including a light emitting layer on a thick sapphire substrate 121. If such a thick sapphire substrate 121 is used, This is advantageous in terms of light extraction efficiency in the lateral direction.

[Other variations]
The embodiment of the present invention is not limited to the above-described embodiment, and other modifications as exemplified below may be made. Even with such modifications and applications, the effects of the present invention can be obtained based on the functions of the present invention.
(Modification 1)
For example, in Example 1 described above, the light-shielding frame 140 of FIGS. 4 and 5 is applied using a dispenser, but this light-shielding frame 140 is formed by repeatedly layering screen printing many times. And can be formed with high accuracy by such a method.

(Modification 2)
Further, the display window 171a of the light emitting segment 100 in FIGS. 3 and 5 is formed in a shape suitable for constituting a so-called 7-segment, but the outline shape of such a display window 171a is arbitrary. . That is, the light-emitting display by the LED light-emitting display device of the present invention is not limited to the so-called 7-segment numerical display, and the contour shape of the light-emitting segment can be arbitrarily formed.

(Modification 3)
Moreover, although LED120W of FIG. 4 is being fixed face-up (horizontal placement), the orientation at the time of fixing the LED to be used may be arbitrary, and may be face-down (horizontal placement), vertical placement, diagonal placement, or the like. In particular, when LEDs are placed vertically (vertically), it is easy to output light in the lateral direction, which is advantageous. Further, as the output light distribution of the LED, it is desirable to select one having a wide light distribution using a thick sapphire substrate such as the first LED 120W of FIG.

(Modification 4)
The emission wavelength of the first LED may be arbitrary, and the wavelength of the output light of the phosphor that converts the emission wavelength may be arbitrary. Any well-known one can be used for the first LED of the present invention and the phosphor that emits light by excitation.

  The present invention relates exclusively to an on-vehicle outside temperature display device. However, the structure of a light-emitting segment using the LED according to the present invention is not limited to any display application that can be realized by a light-emitting segment (eg, LED light emission). For example, display devices on the front panel of a vehicle, incoming call displays on mobile phones, clocks on digital displays, floor displays of elevators, operation information and operation information on household appliances, etc. The present invention can be applied to a display unit that displays control information and the like.

Logical configuration diagram of the on-vehicle outside temperature display device 300 according to the first embodiment. Front view of LED light-emitting display device 200 of in-vehicle outdoor temperature display device 300 Partial enlarged view of the outside temperature display area 210 of the LED light emitting display device 200 Sectional drawing of the light emission segment 100 used for the outside temperature display area 210 The top view of the light emission segment 100 used for the outside temperature display area 210 Flowchart of program for realizing display pattern editing means 320 Logical configuration diagram of the on-vehicle outside temperature display device 301 according to the second embodiment. The top view of the light emission segment 101 used for the LED light emission display apparatus 201 Flowchart of program for realizing display pattern editing means 320 ' Sectional drawing of the light emitting segment 102 of Example 3

Explanation of symbols

100: Light emitting segment 110: Insulating substrate 111: Lead electrode 120W: First LED
120B: Second LED
120R: Third LED
140: Light-shielding frame 140a: Separator 155: Phosphor layer 160: Sealing resin 171: Mask sheet material 171a: Display window 200: LED light emitting display device 210: Outside air temperature display region 300: In-vehicle outside temperature display device

Claims (8)

In a vehicle-mounted outside temperature display device that detects and displays the outside temperature of a vehicle,
An outside air temperature detecting means for detecting the outside air temperature of the vehicle;
An LED light-emitting display device that displays the outside air temperature by a light-emitting segment whose emission color is switched over a plurality of colors;
Road surface freezing estimation means for estimating whether or not the road surface during running is frozen,
Display color determining means for determining a display color of the outside air temperature based on the estimated road surface state,
The LED light emitting display device
A first LED that emits light while causing fluorescent light emitted from surrounding phosphors to emit light;
A second LED that emits light independently of the first LED;
A light-shielding mask sheet material that is disposed on the light emitting segment and masks the contour shape of the light emitting display of the light emitting segment;
A light-shielding separator that separates the region where the second LED is disposed from the region where the phosphor is disposed so that the light emitted from the second LED does not directly enter the phosphor;
A light-transmitting sealing resin mixed with a light diffuser constituting the light-emitting portion of the light-emitting segment;
A light-shielding frame surrounding the sealing resin from the side,
The phosphor, the first LED, and the second LED are:
An in-vehicle outdoor temperature display device, which is disposed in a masked area masked with the mask sheet material.   The on-vehicle outside temperature display device according to claim 1, wherein the first and second LEDs are blue light emitting LEDs, and the phosphor is a phosphor that converts blue light into yellow light.   The overheating prediction means for predicting the occurrence of overheating of the engine of the vehicle is further provided, and the light emitting segment includes a third LED having a light emission color different from that of the first and second LEDs. The in-vehicle outside temperature display device according to claim 1 or 2.   The on-vehicle outside temperature display device according to any one of claims 1 to 3, wherein the light-shielding frame is made of a black or dark material.   5. The vehicle-mounted device according to claim 1, wherein the back surface of the mask sheet material is formed of a reflective surface made of a reflective member, a reflective agent, or a paint having a reflective action. Outside temperature display device. The on-vehicle outside temperature according to any one of claims 1 to 5, wherein the light-shielding frame is formed of a resin that is applied to an upper surface of a wiring board and cured in a partition shape. Display device. The filling region of the sealing resin is composed of an internal space of a through hole formed in a flat substrate,
The bottom surface of the filling region is composed of an upper surface of a wiring board in which the base materials are laminated and bonded together, and the light shielding frame is composed of a side wall portion of the through hole. The on-vehicle outside temperature display device according to any one of claims 1 to 5.   8. The sealing resin according to claim 1, wherein the sealing resin has a reflecting member, a reflecting agent, or a coating material having a reflecting action on at least a part of a bottom surface or a side surface thereof. Automotive outside temperature display device.

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