Illuminated display

0001The invention relates to lighting for a display and / or a display part in an illumination color, with a display and / or display part which can be illuminated by a light source of a color other than the illumination color, the light source on the side of the display facing away from an observer and / or of the display part and a color filter is arranged between the light source and the display and / or display part.

0002In the case of such illuminations, it is known to generate the illuminating color in which the display or the display part is to appear by mixing the light colors of the light source and the color filter.

0003In order to get exactly the desired mixed color, a complex adjustment is necessary. B. the drive currents of the light source required. In addition, the color filter leads to a significant loss of luminosity.

0004The object of the invention is therefore to provide lighting of the type mentioned at the outset, by means of which an exactly determinable lighting color can be achieved with little effort without losses or even with an increase in the luminosity.

0005This object is achieved in that the color filter is a partial filter through which part of the light from the light source can be filtered and another part of the light from the light source can be filtered. By mixing the unfiltered light portion with the filtered light portion, the lighting color is easily achieved.

0006If the color filter is a filter emitting the filtered light component, in particular a fluorescence filter, through which the filtered light component can be emitted, a loss in luminance is particularly low.

0007In order to obtain the illumination color white using only a single colored light source, the color locations of the color of the light source and the color of the filtered light portion can lie on opposite sides of the achromatic point on an approximately straight-line connection that intersects the achromatic region in the standard color table.

0008The light source can be a light-emitting diode (LED) in a cost-effective manner.

0009If the light source is an SMD light-emitting diode, it can be arranged and contacted with the other electrical or electronic components on a printed circuit board in one operation.

0010A reduction of the components and thus the required installation space is achieved in that the light-emitting diode is an LED chip arranged in a housing, the LED chip being covered on the observer side by a color transparent or color translucent material forming the color filter.

0011The colored transparent or colored translucent material can preferably be a colored epoxy resin.

0012The color of the light source is preferably lower in wavelength than the color of the filtered light component. As a result, the visual light intensity of the mixed light can be increased compared to the light of the light source.

0013The display and / or the display part can consist of a transparent material, the display being a transilluminatable display panel and the display part being a pointer of a pointer instrument.

0014Another possibility is that the display panel is a transmissively radiolucent liquid crystal display.

0015Embodiments of the invention are shown in the drawing.

0016Show it:<dl id="dl0001" compact="compact"><dt>Fig. 1:</dt><dd>A view of an ad</dd><dt>Fig. 2:</dt><dd>A cross section of the display of FIG. 1st</dd><dt>Fig. 3:</dt><dd>A side view of a pointer</dd><dt>Fig. 4:</dt><dd>A graph of intensity versus wavelength</dd><dt>Fig. 5:</dt><dd>The standard color chart</dd><dt>Fig. 6:</dt><dd>A perspective view of a light emitting diode</dd></dl>

0017The display shown in Figures 1 and 2 has 6 display panels 1 made of a transparent material, which are arranged on an opaque display panel 2. On the back, behind each display panel 1, there is a light-emitting diode 4 that produces a colored and blue light.

0018A color filter 5 is located between each light-emitting diode 4 and the display panel 1 assigned to it. The color filter 5 is a fluorescence filter, which is a partial filter and unfiltered part of the light from the light-emitting diode 4 and absorbs a further part of the light from the light-emitting diode and at a higher wavelength emitted again.

0019In Fig. 3, a pointer 6 of a pointer instrument is shown, which consists of a transparent material, which also has a pointer hub 7, which is also made of transparent material and into which light from a light-emitting diode can also be coupled via a color filter 5. On a deflecting surface 8 of the pointer 6 inclined to the pointer hub 7, the light coupled into the pointer hub 7 is deflected towards the pointer tip 9 into the pointer flag 10.

0020On the surface of the pointer flag 10 facing away from an observer, the light is deflected further toward the observer.

0021The color filter 5 and the light-emitting diode 4 in FIG. 3 are of the same type as the color filter 5 and light-emitting diodes 4 in FIGS. 1 and 2.

0022In the standard color table in FIG. 5, the color locations of the color of the light-emitting diode 4 are included <img file="EP0803711A1_D0001.tif" />A "and the color of the light portion filtered and emitted by the color filter 5 <img file="EP0803711A1_D0001.tif" />B "and represented by a straight line <img file="EP0803711A1_D0001.tif" />C "connected. This straight line <img file="EP0803711A1_D0001.tif" />C "goes through the achromatic dot <img file="EP0803711A1_D0001.tif" />E "the standard color chart.

0023In the diagram in FIG. 4, the spectrum of the color of the light-emitting diode 4 (blue) with a broken line 11 and the spectrum of the color are absorbed by the color filter 5 designed as a fluorescence filter and emitted again at a higher wavelength (yellow-green) with a dash-dotted line 12 shown.

0024The unfiltered portion of the light from the light-emitting diode 4 (blue) is shown with a dash-dotted line 13. The absorption of a light component of the color of the light-emitting diode 4 results in a reduction in the energy and thus in the intensity of the remaining non-absorbed light component in the light-emitting diode 4.

0025The resulting spectrum of the non-absorbed light component (line 13) and of the absorbed light component and again emitted with a higher wavelength (line 12) is shown with a solid line 14.

0026Since, as shown in Fig. 5, the color locations of the non-absorbed light portion <img file="EP0803711A1_D0001.tif" />A "and the absorbed and re-emitted light component <img file="EP0803711A1_D0001.tif" />B "on different sides of the achromatic point <img file="EP0803711A1_D0001.tif" />E "and their connecting straight line <img file="EP0803711A1_D0001.tif" />C "the achromatic point <img file="EP0803711A1_D0001.tif" />E "intersects, the color of the resulting spectrum and thus the lighting color of the display panel 1 and the pointer 6 is white.

00276 consists of a housing 15 into which an anode connection 16 and a cathode connection 17 lead from the outside parallel to one another, the ends of which in the housing 15 are bent towards one another. An LED chip 18 is arranged on the bent end of the cathode connection 17 and is conductively connected to the bent end of the anode connection 16 by means of a contact wire 19. Starting from the area of ​​the LED chip 18, reflector surfaces 20 diverging from one another are led to an observer-side opening 21 of the housing 15. The entire housing is filled with an epoxy resin 22, which contains mixed-in colored fluorescent particles 23 and thus forms a fluorescence filter for the light emitted by the LED chip 18.