EP1971191B1 - Electric/electronic device for generating colour depictions - Google Patents

Description

The present invention is based on one designed according to the preamble of the main claim electrical / electronic device for generating color representations in larger arrangements with several, each of the three primary colors (RGB) generating LED arrays.

Such electrical / electronic devices are provided in particular for producing a homogeneous color impression within larger arrangements with a plurality of LED arrangements. Such larger arrangements can z. B. as a flat and / or spatially designed lights, display units, video walls, etc. be designed. Often it is important that not only a homogeneous color impression is created for the human eye, but that the individual colors can also be represented as saturated as possible.

By the document MCS for the adjustment of the color reproduction of the company MAZeT GmbH from the year 2005, "use of RGB color sensors for the adjustment of the color reproduction with screens" a state of the art according to preamble of the two main claims become well-known. The corresponding adjustment is based on the fact that the colored light impression is determined beforehand by a photometric measurement for each individual LED arrangement producing the primary colors. At least one LED arrangement can be designed as a three-color primary (RGB) generating three-color LED chip. By means of the correction data resulting from the measurement, the operating parameters (energization) for all LED elements of the LED arrangements are then adjusted in such a way that a homogeneous color impression is produced for the human eye over the entire arrangement. Due to the principle of such a correction, however, the range of colors that can be displayed is limited in terms of their saturation, since for each of the three Primary colors (RGB) must be taken into account for that LED element of the LED arrays whose respective primary color has the worst image quality. Because this has a disadvantageous effect on a rich representation of the individual primary colors (RGB) or the mixed colors produced thereby, in particular for larger arrangements, this is unacceptable for many applications in which high quality in terms of saturated-color reproduction is important. Often leaves to be desired in larger arrangements, the generation of a uniform light intensity impression, which is also not acceptable especially for high-quality applications.

Furthermore, by the DE 20 2006 014 351 U1 an electrical / electronic device has become known, which has at least one printed circuit board, which is equipped with a plurality of LED arrays. Such an electrical / electronic device is equipped with a driver circuit, via which each individual LED element of the LED arrays can be controlled individually, so that there is the possibility of color representation, each individual LED element of the LED assemblies by a corresponding current supply to influence its colored light output.

Based on this prior art, the present invention seeks to provide an electrical / electronic device in which the production of saturated as possible colors in the color representation, the effects of corrections on the non-involved primary colors (RGB) are as low as possible and at the same time the greatest possible homogeneity of the colored light impression emitted by the arrangement is ensured.

Furthermore, the object is to be achieved by an electrical / electronic device according to the invention that the correction data and color measured values determined by a photometric measurement can be made available at any time in a simple manner when controlling larger arrangements.

According to the invention this object is achieved by the features specified in the main claim.

In such a design is particularly advantageous if a second correction unit is provided, which has at least one further microprocessor for reading and processing the correction data belonging to a module circuit boards, wherein implemented in the microprocessor of the second correction unit, a further algorithm for controlling the light intensity impression is, by which depending on the correction data or color measurement values of the individual circuit boards, a weighting is made such that the circuit board, which has the lowest light intensity, the resulting light intensity for the module dictates. This ensures that in the case of a module consisting of several printed circuit boards, a light intensity impression which is as uniform as possible is generated.

Figur 1:

prinziphaft ein Blockschaltbild mehrerer Leiterplatten, welche nacheinander einer lichttechnischen Messeinrichtung zugeordnet werden;

Figur 2:

prinziphaft ein Blockschaltbild eines aus sechs Leiterplatten bestehenden Moduls;

Figur 3:

prinziphaft ein Blockschaltbild eines Moduls, welches mehrere, jeweils sechs Leiterplatten aufweisende Unterbaugruppen aufweist.

Further advantageous embodiments of the subject invention are specified in the subclaims. Based on two embodiments, the invention will be explained in more detail in principle. Showing:

FIG. 1:

in principle, a block diagram of several printed circuit boards, which are assigned successively to a lighting measuring device;

FIG. 2:

in principle a block diagram of a module consisting of six printed circuit boards;

FIG. 3:

in principle, a block diagram of a module having a plurality, each having six printed circuit boards having subassemblies.

As can be seen from the figures, such an electrical / electronic device for generating saturated colors for larger arrangements of a plurality of circuit boards 1, which are each equipped with a plurality of LED arrays 2. Each LED array 2 is provided for generating the three primary colors (RGB) red, green, blue. In order to ensure a good color rendering quality, each LED array 2 is designed as a three-color LED chip, which in each case three Has LED elements. Each LED element is designed to produce one of the three primary colors (RGB). For driving the LED arrays 2, a driver circuit, not shown for the sake of simplicity, is provided. About the driver circuit, each individual LED element of all LED assemblies 2 can be influenced by appropriate energization in terms of its colored light output. Thus, it is possible via the driver circuit for each LED element and thus set for each LED array 2 the colored light impression. For photometric measurement of each LED array 2, a lighting measuring device LTM is provided. One after the other, the printed circuit boards 1 are fed to the lighting measuring device LTM in order to be able to determine the respectively associated color measurement values and correction data.

As can further be seen from the figures, each printed circuit board 1 is equipped with a connection interface 3 and with a correction unit 4. Each correction unit 4 has a microprocessor 5 and a memory 6.

In the prior art, the adjustment is based on the fact that the colored light impression is determined beforehand by a photometric measurement for each individual LED arrangement producing the primary colors. By means of the correction data resulting from the measurement, the operating parameters (energization) for all LED elements of the LED arrangements are then adjusted in such a way that a homogeneous color impression is produced for the human eye over the entire arrangement. Due to the principle of such a correction, however, the range of colors that can be displayed is limited in terms of their saturation, since for each of the three primary colors (RGB), that LED element of the LED arrangements whose respective primary color has the worst image quality must be taken into consideration.

As in particular from FIG. 1 As can be seen, each printed circuit board 1 is first supplied to a photometric measuring device LTM, via which the colored light impression is measured for each LED array 2 present on the printed circuit board 1. On a printed circuit board 1 nine LED arrays 2 are present, the LED elements with respect to the three primary colors red, green and blue (RGB) by a driver circuit, not shown, are each individually controlled. Successively will be for each printed circuit board 1 is determined by the light-technical measuring device LTM for each of the nine LED assemblies 2 of the colored light impression and then derived from the measurement resulting correction data or color measurements. On each circuit board 1 is associated with the correction unit 4 associated with the memory 6 in connection with microprocessor 5 is present. In order to control the colored light impression, an algorithm which is implemented in the microprocessor 5 of the correction unit 4 is taken into account in addition to the correction data and the color measurement values. Depending on the composition of the colored light impression, the algorithm makes a weighting of the correction data or colorimetric values stored in the memory 6 from the proportions of the three primary colors (RGB) red, green and blue such that individual ones of the three primary colors (RGB) represent LEDs Elements of the LED arrays 2 are applied according to the algorithm with the weighted correction data. A photometric adaptation for each individual LED element of the nine LED arrays 2 is thus always carried out with operating parameters or an energization, which were calculated taking into account the correction data and the algorithm. This ensures that colors that are as saturated as possible are generated in the color representation because the effects of the corrections on the non-involved primary colors (RGB) are kept as low as possible by the algorithm.

With regard to the colored light impression, the correction data and the color measurement values determined by the measurement are again stored in the memory 6 of the correction unit 4 in readable form. Each printed circuit board 1 is also provided with a connection interface 3 for forwarding both the correction data stored in the memory 6 and the color measured values stored in the memory 6. Each connection interface 3 is for this purpose in turn electrically connected to the associated microprocessor 5 and the associated memory 6.

As in particular from FIG. 2 As can be seen, an electrical / electronic device for generating color representations in larger arrangements of a six circuit boards 1 having module M is formed. On the module M a with all circuit boards 1 electrically related second correction unit 7 is arranged, which is used for reading and processing the Correction data and the color measurement of all belonging to the module M printed circuit boards 1, a further microprocessor 8 and a further memory 9 has. In the further microprocessor 8 of the second correction unit 7, a further algorithm for controlling the light intensity impression is implemented. By the further algorithm, a weighting of the correction data or color measurement values is carried out in such a way that the printed circuit board 1, which has the lowest light intensity, predetermines the resulting light intensity for all printed circuit boards 1 of the module M. This ensures that the greatest possible homogeneity of the light intensity emitted by the arrangement or the module M is realized. Because each of the nine LED arrays 2 is implemented as a tri-color LED chip producing the three primary colors (RGB), and the driver circuit is adapted to drive each individual LED element of the tri-color LED chips, the observer will also experience a colored light impression with a particularly good picture quality.

As in particular from FIG. 3 As can be seen, such an electrical / electronic device for generating color representations in larger arrangements of a module M, which consists of a plurality, each having six circuit boards 1 having subassemblies 10. In this case, the second correction unit 7 is integrated into a personal computer PC which can be connected to the module M or is electrically connected to all subassemblies 10. By such a construction can be easily controlled and particularly large electrical / electronic devices for generating color representations as needed.

Claims (7)

1. Electrical/electronic facility for generating colour representations in larger systems having a plurality of LED arrays provided on at least one printed circuit board the LED elements of which are each individually controllable by a driver circuit as regards the three primary colours red, green and blue (RGB), with the coloured light impression of each individual LED array of a printed circuit board being ascertained by a photometric device and the correction data resulting from this measurement then being deduced and, subsequently, the coloured light impression being adjusted by a correction unit provided on the printed circuit board by means of applying energy to each individual LED element of the LED arrays corresponding to the correction data, and with a microprocessor pertaining to the correction unit and connected to a memory being provided on each printed circuit board, characterised in that, for the purpose of controlling the coloured light impression, an algorithm is implemented in the microprocessor (5) of the correction unit (4) by way of which a weighting of the correction data is undertaken in dependence on the composition of the coloured light impression arising from the proportions of the three primary colours (RGB) red, green and blue, in such a manner that preferably saturated colours emerge for the colour representation and that for this purpose individual LED elements of the LED arrays (2) representing the three primary colours (RGB) are subjected to the weighted corrections corresponding to the algorithm and that this correction data is filed in the memory (6) pertaining to the correction unit (4).
2. Electrical/electronic facility according to Claim 1, characterised in that the correction data and the colorimetric values ascertained by means of the photometric measurement are filed in the memory (6) of the correction unit (4) so that they can be read out again, and that each printed circuit board (1) has at least one connection interface (3) which is electrically connected to the microprocessor (5) and the memory (6) for the purpose of forwarding both the correction data filed in the memory (6) and the colorimetric values filed in the memory (6).
3. Electrical/electronic facility according to Claim 1 or Claim 2, characterised in that at least two printed circuit boards (1) are combined to a module (M) and that a second correction unit (7) is allocated to the module (M) that has at least one further microprocessor (8) for reading out and processing the correction data and colorimetric values of all the printed circuit boards (1) pertaining to the module (M), and that a further algorithm for controlling the light intensity impression is implemented in the further microprocessor (8) by way of which a weighting of the correction data and colorimetric values is undertaken in such a manner that the printed circuit board (1) that has the lowest light intensity determines the resulting light intensity for the module (M).
4. Electrical/electronic facility according to any of Claims 1 to 3, characterised in that at least one LED array (2) is executed as a three-colour LED chip generating the three primary colours (RGB), and that a driver circuit is provided which is suitable for triggering each individual LED element of the three-colour LED chip.
5. Electrical/electronic facility according to any of Claims 1 to 4, characterised in that the second correction unit (7) is provided on the module (M).
6. Electrical/electronic facility according to any of Claims 1 to 4, characterised in that the second correction unit (7) is integrated in a personal computer (PC) which can be connected to the module (M).
7. Electrical/electronic facility according to any of Claims 1 to 6, characterised in that the module (M) comprises a plurality of sub-assemblies (10), each of which has at least two printed circuit boards (1).

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