Display apparatus with liquid crystal cells, preferably for moto

Details Display apparatus with liquid crystal cells, preferably for moto Display apparatus with liquid crystal cells, preferably for moto

1988-12-16

1990-10-23

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340702, 3408151, 350345, G09G 336

Patent

active

049655647

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a display apparatus for measured values, trouble indications and the like for use preferably in motor vehicles,
In a known display apparatus of this type, areas of the liquid crystal cell having various coloring of the letters and symbols and are data to be displayed, respectively, are by color foils which are inserted between the liquid crystal cell and a transflector which is arranged behind the liquid crystal cell, so that good coloration is achieved in bright ambient light so in darkness (Elektronik, 1983, 19, page 16). It is also known to arrange a corresponding color imprint on the back of the liquid crystal cell in the areas with different coloration when using transmissive liquid crystal cell. This is particularly desirable in large liquid crystal displays in motor vehicles where warning or trouble indications are to be emphasized relative to other indications such as clock time, velocity, engine speed and the like by means of different colors.
However, a disadvantage of the known solutions is that each area of the liquid crystal cell can only have one color assigned to it. If different colors of the various areas of the liquid crystal cell are desired in different types of vehicles it is necessary to have available a corresponding wide assortment of liquid crystal cells, which requires a considerable expenditure on storage. It is also disadvantageous that the different coloring produced by means of foils or color printing affect the blocked areas of the liquid crystal cell which are not triggered, so that an undesirable irregular background brightness results in these areas.


SUMMARY OF THE INVENTION

The object of the present invention is to make it possible to freely select a different coloring in various areas of the liquid at any crystal cell at any time so as to provide complete flexibility for the selection of the coloration with limited storage capacities.
The object of the invention in achieved in a display apparatus, according to the invention by employing a liquid crystal cell having areas of different coloration, light shafts for supporting light sources having different color for illuminating the areas of the liquid crystal cell, of which at least one light source is turned on permanently to provide a uniform background brightness for the liquid crystal cell. The apparatus according to the present invention has the advantage that while the areas of the liquid crystal cell with different coloration are determined by the design and arrangement of the light shafts behind the liquid crystal cell, the desired coloration is nevertheless first achieved by the introduction of a light source with the desired color into the individual light shafts. Another advantage consists in that a uniform background brightness is made possible by known measures, such as the arrangement of scattering foils and fluorescent plates, screen print and the like, in the blocked areas of the liquid crystal cell and in that a uniform transmission of light in the triggered areas of the liquid crystal cell is achieved, at that the transition of color between the areas of different coloration is so smooth that a very good optical appearance results. It is particularly advantageous to arrange a plurality of light sources of different colors in at least one of the light shafts, which light sources can be switched on individually. Accordingly, the color can be switched in this area of the liquid crystal cell e.g. in that a bulb with white light is provided for the background brightness in that a green light is switched on for function and condition indications, insofar as the displayed values and functions are normal, and finally in that a red light is switched on for this area of the liquid crystal cell for displaying disturbances, wherein the trouble indication is distinguished of the liquid crystal cell by means of the intermittent display of the problem function.


BRIEF DESCRIPTION OF THE DRAWING

The invention itself, however, both as to its construction and its m

REFERENCES:
patent: 4386826 (1983-06-01), Stolov
patent: 4649381 (1987-03-01), Masuda et al.
patent: 4673252 (1987-06-01), Kugo et al.
patent: 4772885 (1988-09-01), Uehara et al.

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