Method for controlling lighting module of motor vehicle lamp in resolution-optimized manner

Abstract

The invention relates to a method for controlling a lighting module (1) for a motor vehicle lamp (10) in a resolution-optimized manner, the lighting module (1) being designed to emit a segmented light distribution having individually controllable light segments (51), the lighting module (1) comprising a deflection unit (4) via which the light segments (51) are deflected by the deflection unit (4). The native resolution of the lighting module (1) can be visually increased by at least temporary light deflection by means of the deflection unit (4), the control being carried out in such a way that a first low-resolution image (A) is emitted by the lighting module (1) in a first time range (T1), the first low-resolution image (A) being emitted by the lighting module (1) in the first time range (T1), the first low-resolution image (A) is repeatedly deflected by means of a deflection unit (4) in such a way that the first low-resolution image (A) is visually at least partially superimposed on itself in a first time range (T1).

Description

Technical Field

[0001] The invention relates to a method for controlling a light module for a motor vehicle lamp in a resolution-optimized manner, wherein the light module is configured to emit a segmented light distribution having individually controllable light segments, wherein the light module comprises a deflection unit, by means of which the native resolution of the light module can be visually increased by at least temporarily deflecting the light with the aid of the deflection unit. Background Art

[0002] Methods for controlling light modules are known from the prior art, which methods enable a time-varying change in the light emission of individual light segments of a light distribution. The resolution is usually limited by the resolution of the relevant light module. In order to achieve an increase in the visual resolution, methods are known in which the native resolution of the light module can be visually increased by using a deflection unit by at least temporarily deflecting the light with the aid of the deflection unit.

[0003] US2020 / 0363707 shows an optical device. The disclosure shows that the resolution of the optical device can be improved when two different images are visually superimposed. For this purpose, two different images are calculated from the input image. The two different images are sent one after the other in time using a synchronization signal for a deflection unit that is physically separated from them. This synchronization is obviously very cumbersome and takes up resources. Summary of the invention

[0004] It is therefore an object of the present invention to provide a method by means of which the control of a lighting module in a resolution-optimized manner can be simplified.

[0005] This object is achieved by a method of the type mentioned at the outset, wherein the method comprises the following steps:

[0006] a) receiving a target image, wherein the target image has a resolution exceeding a native resolution of the light module;

[0007] b) converting the target image received in step a) into a first low-resolution image according to a first conversion rule, wherein the first low-resolution image is selected such that the first low-resolution image has a native resolution of the light-emitting module, wherein the first low-resolution image is additionally selected such that at least part of the first low-resolution image visually superimposed thereon has an image perception that is closer to the target image than a projection of the first low-resolution image itself,

[0008] c) controlling the light-emitting module, wherein the control is performed such that a first low-resolution image converted according to step b) is emitted by the light-emitting module within a first time range, wherein the first low-resolution image is repeatedly deflected within the first time range by means of a deflection unit such that the first low-resolution image is visually superimposed at least partially with itself within the first time range.

[0009] The expression "resolution" is to be understood as the total number of light segments in the respective image. The "native resolution" therefore refers to that resolution given by the total number of light segments that can be individually controlled for light emission. If, for example, the light segments are arranged in two rows and two columns and can be controlled individually, this corresponds to a native resolution of 2×2, wherein each individually controllable light segment can also be referred to as a luminous pixel. The lighting module preferably has a native resolution of at least 2×2. It is particularly preferably a high-resolution lighting module for a motor vehicle light.

[0010] In the context of the present patent application, the term "unit", alone or in a compound form, such as in "projection unit", "deflection unit", "module control unit" or "memory unit", does not necessarily have to be understood as a single element. The term may also include a plurality of elements, components, modules, parts or combinations thereof.

[0011] By at least temporarily or repeatedly deflecting the light with the aid of a deflection unit, the resolution perceived by the human eye can be increased relative to the native resolution. The visual superposition produced by at least temporarily deflecting the light is understood to be a superposition produced by the persistence phenomenon of the human eye.

[0012] A recurring deflection is a deflection which, within the duration of the first time range, results in a visual superposition of the described first low-resolution image with itself. The degree of superposition of the first low-resolution image with itself can be described by means of at least one deflection parameter.

[0013] The target image may have a target light distribution.

[0014] Regarding the question of image similarity, the person skilled in the art knows suitable algorithms for the assessment. Here, for example, common information (see, for example, the keyword "mutual information") or structural similarity (see, for example, the keyword SSIM, structure similarity index measure) can be considered. For these terms, for example, there is extensive information on the Internet, even in the online encyclopedia "Wikipedia".

[0015] In particular, it can be provided that the deflection unit is designed to repeatedly deflect the first low-resolution image within the first time range at a frequency of at least 30 Hz, typically at a frequency of between 30 Hz and 160 Hz.

[0016] Furthermore, it can be provided that the lighting module has individually controllable light segments, wherein the light distribution is segmented by the individually controllable light segments, which are arranged next to each other in a matrix with a resolution of at least two rows and two columns with virtually no gaps.

[0017] If necessary, it can be provided that the maximum deflection performed by the deflection unit is designed in such a way that, compared with the undeflected reference state, the deflected state has a vertical offset of essentially half the width of the light segment and a horizontal offset, so that in the case of a maximum deflection amplitude, each deflected light segment, except for the edge light segments, is visually superimposed essentially on the four undeflected light segments.

[0018] The light segments other than the edge light segments are essentially superimposed by 25% each in the visual space during repeated deflection. As a result, the perceived resolution can be approximately four times the native resolution. An edge light segment is to be understood as a light segment that is not surrounded on all sides by other light segments, but rather has no adjacent light segments on at least one side. It therefore represents the edge region of the image to be emitted.

[0019] In any case, the degree of superposition can be described by means of at least one deflection parameter.

[0020] In particular, it can be provided that the deflection unit has a neutral position. This position can, but does not necessarily, differ from the zero position. In the neutral position, the deflection unit does not cause a repetitive deflection of the passing light. For situations in which the deflection unit is not required or must be switched off, emission of the low-resolution image continues to be ensured.

[0021] It can be provided that the first transformation rule comprises an at least approximate solution to a system of linear equations, which system of linear equations comprises a collection of linear equations which contain information about the target image with respect to the first low-resolution image which is at least partially superimposed on the target image.

[0022] The preferred embodiment of the first transformation rule as an at least approximate solution preferably comprises an iterative solution of the linear system of equations.

[0023] The linear equation may describe the association of each portion of the target image with each portion of the first low-resolution image that is itself at least partially superimposed.

[0024] The information about the target image mentioned above with respect to the first low-resolution image which is at least partially superimposed on the target image may also contain at least one deflection parameter.

[0025] For efficiency reasons, it can be provided that the first conversion rule is implemented by an external computing unit, wherein the first low-resolution image is preferably stored in a retrievable manner in a memory unit of the lighting module. Furthermore, it can be advantageously provided that in step b), the target image received in accordance with step a) is additionally converted into a second low-resolution image according to a second conversion rule, wherein the second low-resolution image is selected such that it has the native resolution of the lighting module, wherein the second low-resolution image is additionally selected such that the second low-resolution image itself has an image appearance that is closer to the target image than the first low-resolution image, wherein in step c), the second low-resolution image is emitted by the lighting module within a second time range, wherein the second low-resolution image is not repeatedly deflected by means of a deflection unit within the second time range.

[0026] Therefore, the deflection unit can be located in a neutral position within the second time range.

[0027] The second conversion rule preferably comprises a scaling method in which the second low-resolution image is completely converted from information of the target image. The scaling method can include reducing the resolution of the target image to the native resolution of the lighting module. The method can be, for example, a "downsampling" method. Furthermore, the method can be, for example, a block processing method in which the values ​​of all light segments of the second low-resolution image are calculated, for example by averaging the target image block by block.

[0028] It can be provided that the duration and / or the start time of the first time range and the duration and / or the start time of the second time range are determined by at least one control parameter, wherein at least one control parameter contains information about at least one of the following criteria: target light function, ambient temperature, ambient brightness, light module status, vehicle speed.

[0029] For reasons of efficiency, it may be provided that the second transformation algorithm is executed by an external computing unit.

[0030] In particular, it can be provided that the first low-resolution image converted according to step b) and the second low-resolution image converted according to step b) are stored in a retrievable manner in a memory unit in substep b1) before step c).

[0031] The lighting module may preferably include a memory unit.

[0032] Furthermore, it can be provided that the target image has at least one stable light-dark curve, preferably the target image has a plurality of stable light-dark curves which together form a symbol.

[0033] Furthermore, the invention relates to a light module for a motor vehicle lamp, wherein the light module is configured to emit a segmented light distribution, wherein the light module comprises a deflection unit, by means of which a visually perceptible resolution of the light distribution generated by the light module can be increased relative to a native resolution of the light module, wherein the light module is configured to be controlled at least in accordance with step c) of the method.

[0034] It may be provided that the lighting module further comprises a memory unit and a module control unit, wherein the memory unit is configured to store at least one first low-resolution image and at least one second low-resolution image.

[0035] The module control unit is configured to call the first low-resolution image and the second low-resolution image from the memory unit and send a light control signal to the light source, so that the light emitted by the light-emitting module is either the first low-resolution image or the second low-resolution image.

[0036] The module control unit is further configured to control the deflection unit so that the deflection unit repeatedly deflects the first low-resolution image when the light-emitting module emits a first low-resolution image, and the module control unit is further configured to control the deflection unit so that the deflection unit does not repeatedly deflect the second low-resolution image when the light-emitting module emits a second low-resolution image.

[0037] Furthermore, the invention relates to a motor vehicle having such a light module, wherein the motor vehicle and / or the light module are provided to at least partially carry out the aforementioned method.

[0038] Unless otherwise stated, all device features mentioned in the method may also form part of a lighting module for a motor vehicle lamp. Conversely, all device features mentioned in conjunction with the lighting module may also form part of the previously described method. The lighting module may be a signal lamp or a lighting module in a motor vehicle headlamp. The lighting module is preferably designed for use in a motor vehicle lamp, in particular in a signal lamp or in a motor vehicle headlamp. The lighting module may therefore also be part of the device mentioned. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The invention is explained in more detail below with the aid of exemplary and non-limiting embodiments, which are illustrated in the accompanying drawings.

[0040] Figure 1 shows a schematic diagram of a light emitting module,

[0041] Figure 2a A schematic diagram showing a low-resolution image,

[0042] Figure 2b A schematic diagram showing the superposition of two low-resolution images,

[0043] Figure 3 shows a first flow chart according to the described method,

[0044] Figure 4a A second flow chart according to another embodiment of the method is shown.

[0045] Figure 4b A third flow chart according to another embodiment of the method is shown.

[0046] Figure 4c shows a time diagram according to another embodiment of the method,

[0047] Figure 5 showing a comparison of the target image, the first low-resolution image, a superposition of at least part of the first low-resolution image with itself, and the second low-resolution image, and

[0048] Figure 6 A motor vehicle is shown having such a lighting module. DETAILED DESCRIPTION

[0049] Figure 1 A schematic diagram of a lighting module 1 for a motor vehicle lamp 10 is shown. The lighting module 1 is configured to emit a segmented light distribution having individually controllable light segments. The lighting module 1 comprises a module control unit 2, a memory unit 6, a light source 3, a deflection unit 4 and a projection unit 5. The memory unit 6 preferably contains an electronic memory. In addition, Figure 1 An external computing unit 7 is shown.

[0050] Various technologies are known for generating segmented light distributions. These technologies include, in particular, area-based modulation by means of LEDs (light emitting diodes) arranged in a matrix, area-based modulation of light by means of LCDs (liquid crystal displays), or area-based modulation of light by means of DLPs (digital light processing) or DMDs (digital micromirror devices). As an alternative, light modulation technologies are also known, i.e. scanning systems, which scan light or light beams over areas at a frequency that is not perceptible to the human eye, thereby generating a freely variable light distribution. Currently known high-resolution lighting modules already allow for a resolution of a plurality of 1,000 individually switchable and individually dimmable light segments, which are preferably arranged with an aspect ratio of 1:4, with the longer sides extending horizontally.

[0051] Here, the terms “horizontal” and “vertical” may refer to a predetermined installation position of the lighting module 1 , wherein it is only important that “horizontal” and “vertical” are used to identify mutually orthogonal orientations.

[0052] Figure 1The light source 3 shown in the figure may include multiple elements. For example, the light source 3 includes a light-emitting element and a surface modulator (not shown) arranged behind it, such as an LCD, DMD or DLP. Preferably, the light source 3 includes an array with at least two LEDs, wherein each LED can be controlled individually. Particularly preferably, the light source 3 includes an array with more than 1000 individually controllable LEDs, which are arranged in an array with an aspect ratio of 1:4. In addition, alternatively, the light source 3 may include a combination of a light-emitting element, a collimator and a light modulator, which scans the collimated light of the light-emitting element onto an area in the form of a scan at a frequency that is imperceptible to the human eye. A light conversion element may be arranged in this area. Therefore, the light source 3 may be composed of multiple elements. For example, additional elements such as optical lenses or reflectors may be provided, but these additional elements are not shown for clarity.

[0053] It is important that the light beam 30 is emitted from the light source 3, and the light beam has at least two light segments in at least one plane perpendicular to the light propagation direction of the light beam 30, and these light segments may have different light intensities from each other. Therefore, the light beam 30 corresponds at least partially to the low-resolution images A, B in at least one plane perpendicular to the light propagation direction of the light beam 30.

[0054] For this purpose, the light source 3 may receive a light control signal 31 and emit a light beam 30 according to the light control signal 31. For this purpose, the light control signal 31 may at least partially represent the light beam 30 emitted by the light source 3. The module control unit 2 may be configured to send the light control signal 31 for this purpose.

[0055] The light control signal 31 may be designed to be at least a part of an image signal containing a low-resolution image.

[0056] The light beam 30 emitted from the light source 3 is projected by the projection unit 5 in the projection angle range P in front of the light module 1. Therefore, a certain light distribution or a certain low-resolution image is emitted by the light module 1. Accordingly, a projection 50 of a certain low-resolution image is obtained in the projection angle range P in front of the light module 1. Such a projection unit 5 usually includes a plurality of optical elements, in particular lenses. For the sake of clarity, these plurality of optical elements are not shown.

[0057] The projection angle range P is determined by the aperture of the projection unit 5. The projection angle range P therefore corresponds to the maximum possible radiation cone of the projection unit 5. Such a radiation cone is a cone in the mathematical sense, wherein all its sub-variants may also be included. Sub-variants are, for example, pyramidal cones or truncated cones.

[0058] For example, Figure 2aAs shown in FIG. 1 , the projection 50 of the low-resolution image includes an array of five rows and twenty columns of light segments 51. Thus, the native resolution shown of the light module 1 includes 20×5 light segments 51. Although only a few hundred light segments 51 are shown, the light source 3 can be designed so that thousands of light segments 51 are projected or emitted by the light module 1 within the projection angle range P.

[0059] Figure 1 The deflection unit 4 shown in FIG. 4 can now temporarily deflect the light beam 30 emitted by the light source 3 and thus also the projection 50 . Thus, the native resolution of the light module 1 can be visually increased by at least temporarily deflecting the light with the help of the deflection unit 4 .

[0060] Preferably, the deflection unit 4 is arranged between the light source 3 and at least a part of the projection unit 5 in the beam path of the light beam 30. At least a part of the projection unit 5 means that the projection unit can be composed of a plurality of optical elements as explained above, and the deflection unit 4 can be arranged between these optical elements.

[0061] The deflection unit 4 may receive the deflection control signal 41 and deflect the light beam 30 emitted from the light source 3 according to the deflection control signal 41. Therefore, the projection 50 of the low-resolution image may be temporarily deflected within the projection angle range P according to the deflection control signal 41. The module control unit 2 may be configured to issue the deflection control signal 41.

[0062] The deflection unit 4 may include a glass sheet 42, which is made of a material that is transparent to the light beam 30 emitted by the light source 3. The glass sheet 42 may be implemented as a plane-parallel plate and may be pivotably supported about at least one pivot axis x by a corresponding mechanical suspension structure, wherein the pivot axis x is preferably perpendicular to the light propagation direction of the light beam 30 emitted by the light source 3. For example, the deflection unit 4 may also include an electromagnetic actuator (not shown) that temporarily pivots the glass sheet 42 about at least one pivot axis x according to a deflection control signal 41. The incident angle of the light beam 30 entering the glass sheet may be temporarily changed by the pivoting, whereby the light beam 30 may be deflected parallel to the light propagation direction of the light beam 30 when the light passes through the glass sheet 42 in accordance with the refraction of the light. As a result, the light beam 30 emitted by the light source or the projection 50 of the low-resolution image may be deflected in front of the light-emitting module 1. This is achieved by means of Figure 2b Elaborate in detail.

[0063] A person skilled in the art knows various possible solutions for realizing such a deflection unit 4. For example, a prism (not shown) is also conceivable, which can deflect the projection 50 of the light beam 30 or the low-resolution image within the projection angle range P by a lateral position change (relative to the light propagation direction of the light beam 30) and thus also by refraction. A reflective solution for the deflection unit 4 is also possible.

[0064] By at least temporarily deflecting the projection 50 of the low-resolution image within the projection angle range P, such as Figure 2b As shown in , the angular range of illumination is expanded. In particular, the deflected projection 52 and the undeflected projection 50 can be visually superimposed with sufficiently fast and repeated deflection or with a sufficiently high deflection frequency of at least 30 Hz, preferably between 30 Hz and 160 Hz. In this way, a visual light segment 51v can be formed, through which the resolution of the light module 1 is visually improved. For the sake of simplicity, we say superposition, but it is clear that this superposition is caused by the persistence phenomenon of the human eye.

[0065] Thus, at least temporarily deflecting the projection 50 within the projection angle range P means a movement of the projection 50 in the possible radiation cone, i.e. in the angular space obtained by the projection unit 5. The projection angle range P preferably has a horizontal and a vertical extension, wherein the horizontal extension can be greater than the vertical extension. For example, the horizontal extension covers an angular range of up to 50°, while the vertical extension covers an angular range of up to 20°.

[0066] In the sense of the present description, the undeflected projection 50 and the deflected projection 52 each show a projection of the same low-resolution image. Thus, the visual superposition of the low-resolution image with itself results from the visual superposition of the deflected projection 52 with the undeflected projection 50 of the same low-resolution image. The degree of superposition of the low-resolution image with itself can be described according to at least one deflection parameter.

[0067] In the present case, the maximum deflection of the deflection unit 4 is designed such that the deflected projection 52 has a vertical offset of substantially half the width of a light segment and a horizontal offset compared to the undeflected projection 50. Thus, each light segment 51 - except for the edge light segments - at the maximum deflection shown here is superimposed with four undeflected light segments 51 of the same low-resolution image. The perceived resolution can thus be approximately four times the native resolution.

[0068] Figure 3A first flow chart is shown. In the first flow chart, a target image S is received in a first step a). The target image S has a resolution that exceeds the native resolution of the lighting module 1. The target image S can be contained in the image signal. The target image S can also form part of a larger image, which has a higher resolution than the target image S. This means that the target image S can form part of a larger image.

[0069] In a subsequent step b), the target image S received in step a) is converted into a first low-resolution image A according to a first conversion rule. The first low-resolution image A is selected so that it has the native resolution of the lighting module 1. The first low-resolution image A is also selected so that the image perception obtained by visually superimposing itself at least partially is closer to the target image S than the projection of the first low-resolution image A itself.

[0070] The first conversion rule can be implemented by the module control unit 2. Therefore, the module control unit 2 can be configured to implement the first conversion rule. However, preferably, the first conversion rule is implemented by the external computing unit 7. That is, the external computing unit 7 can be configured to receive the target image S according to step a). In addition, the external computing unit 7 can be configured to implement the first conversion rule according to step b). In this case, the external computing unit 7 is preferably not part of the lighting module 1.

[0071] It may be provided that the first low-resolution image A is stored in a retrievable manner in the memory unit 6 of the lighting module 1. If the first transformation rule is implemented by an external computing unit 7, the external computing unit 7 may be configured to store the first low-resolution image A in a retrievable manner in the memory unit 6 of the lighting module 1. In this case, the module control unit 2 may be configured to retrieve the first low-resolution image A stored in the memory unit 6.

[0072] The first transformation rule preferably includes at least an approximate solution to a system of linear equations. The system of equations includes a set of linear equations and can be described in the form of Sv=Km·Av. "Km·Av" corresponds to matrix-vector multiplication. Sv represents a vector with a certain number of target light intensity values, the number of which corresponds to the resolution of the target image S. Therefore, in the case of a target image resolution of 40×10, the vector Sv includes four hundred components. Therefore, the system of linear equations in the current case includes four hundred equations. Av also represents a vector with a certain number of light intensity values ​​to be solved, the number of which corresponds to the resolution of the first low-resolution image A. Therefore, the approximate solution to the system of linear equations in the current case includes one hundred light intensity values ​​to be solved. By superimposing the first low-resolution image A with its own part, the association between the light intensity values ​​to be solved and the target light intensity values ​​is obtained. This association is described with the help of a relationship matrix (Konnexmatrix) Km. Therefore, the relationship matrix Km describes the influence of the visual superposition of each light segment 51 with a part of the adjacent light segment 51 on each single target light intensity value. .The relationship matrix Km therefore corresponds to a matrix with four hundred by one hundred elements.

[0073] Therefore, the set of linear equations, ie the number of linear equations, is related to the resolution of the target image S and the resolution of the first low-resolution image A as well as the native resolution of the lighting module 1 .

[0074] The vector Sv having a certain number of target light intensity values ​​and the relationship matrix Km may be collectively referred to as “information of the target image S about the first low-resolution image A at least partially superimposed on itself”.

[0075] The relationship matrix Km can be calculated or measured.

[0076] If the relationship matrix Km is calculated, the aforementioned information of the target image S also has at least one deflection parameter. In the present example, two deflection parameters are predefined, which describe a vertical offset and a horizontal offset whose offset is substantially half the width of the light segment.

[0077] When measuring the relationship matrix Km, for example, each light segment 51 can be activated individually in order to detect the influence of each individual light segment 51 on all or at least some of the corresponding target light intensity values ​​in the form of repeated deflections.

[0078] The embodiment of the first transformation rule as an at least approximate solution to the linear system of equations may include corresponding methods for compensation and / or regularization. The preferred embodiment of the first transformation rule as an at least approximate solution preferably includes an iterative solution of the linear system of equations.

[0079] In another step c), the lighting module 1 is controlled. This control is performed so that the first low-resolution image A converted according to step b) is emitted by the lighting module 1 in the first time range T1. The module control unit 2 can send a corresponding light control signal 31 to the light source 3, so that a corresponding light beam 30 is emitted from the light source 3. The light beam 30 is emitted in the form of a projection 50 by the projection unit 5 in front of the lighting module 1 as described. The projection 50 corresponds to the first low-resolution image A in this context. Preferably, the first low-resolution image A is continuously emitted by the lighting module 1 in the first time range T1.

[0080] If the first low-resolution image A is stored in a memory unit 6 of the lighting module 1 in a callable manner, the module control unit 2 may be configured to call up the first low-resolution image A from the memory unit 6 and to send a light control signal 31 based thereon.

[0081] Furthermore, the first low-resolution image A is repeatedly deflected in the first time range T1 by means of the deflection unit 4, so that in the first time range T1 the first low-resolution image A is visually at least partially superimposed on itself. The module control unit 2 can send a corresponding deflection control signal 41 to the deflection unit 4, so that the first low-resolution image A or its projection 50 is repeatedly deflected. For this purpose, the deflection control signal 41 can also be repeatedly sent to the deflection unit 4. Preferably, the repeated deflection of the first low-resolution image A is performed continuously in the first time range T1.

[0082] The transmission of the light control signal 31 for transmitting the first low-resolution image A and / or the transmission of the deflection control signal 41 for activating the repeated deflection by the deflection unit 4 may start the first time range T1. The transmission of the light control signal 31 for transmitting a low-resolution image different from the first low-resolution image A and / or the transmission of the deflection control signal 41 for stopping the repeated deflection by the deflection unit may end the first time range T1.

[0083] Figure 4a A second flow chart is shown. The second flow chart shows another design of the method, wherein in the first step a), a target image S is received. The target image S has a resolution higher than the native resolution of the lighting module 1. In a subsequent step b), the target image S received in step a) is converted into a first low-resolution image A according to a first conversion rule. The conversion of the target image S into the first low-resolution image A has been accomplished by means of Figure 3 described, and therefore will not be discussed further here.

[0084] Furthermore, in the same subsequent step b), the target image S received according to step a) is converted according to a second conversion rule into a second low-resolution image B. The second low-resolution image B is selected such that it has the native resolution of the lighting module 1. The second low-resolution image B is additionally selected such that it itself has an image appearance that is closer to the target image S than the first low-resolution image A.

[0085] The second conversion rule can be implemented by the module control unit 2. Therefore, the module control unit 2 can be configured to implement the second conversion rule. However, preferably, the second conversion rule is implemented by the external calculation unit 7. Therefore, the external calculation unit 7 can be configured to implement the second conversion rule.

[0086] The second conversion rule preferably includes a scaling method. This scaling method preferably includes reducing the resolution of the target image S to the native resolution of the lighting module 1, wherein the generated second low-resolution image B is completely formed by the information of the target image S. Therefore, the scaling method can be, for example, a known "downsampling" method-this method, for example, discards every second target light intensity value of the target image S, so as to form the light intensity value of the second low-resolution image B from the remaining target light intensity values. In addition, a block processing method can also be used, in which the target light intensity values ​​of the low-resolution target image S are aggregated block by block to form a single light intensity value of the second image B. Aggregating the target light intensity values ​​block by block means, for example, forming the average value of four adjacent target light intensity values, that is, 2×2 blocks, respectively, so as to calculate a light intensity value of the second low-resolution image B respectively. As an alternative to the averaging scheme, other methods, such as median finding, can also be used. Since various different scaling methods are known to those skilled in the art, this will not be discussed in detail.

[0087] In a further step b1), the first low-resolution image A and the second low-resolution image B converted in the previous step b) can be stored in a callable manner in the memory unit 6. The module control unit 2 can be configured to call up the low-resolution images A, B stored in the memory unit 6.

[0088] If the second transformation rule is implemented by the external computing unit 7 , then the external computing unit 7 can be configured to store the second low-resolution image B in a retrievable manner in the memory unit 6 of the lighting module 1 in a subsequent step b1 .

[0089] If the target image S has stable light and dark lines, in particular if the target image S has stable light and dark lines in the form of symbols (described later), it may be advantageous to convert the first low-resolution image A and the second low-resolution image B before the planned use of the lighting module 1. In particular, when high computing power is required in order to convert the low-resolution images A, B from the target image S, it may be very meaningful to carry out the conversion before the intended use of the lighting module 1. Even in this case, the previously converted low-resolution images A, B are stored in the memory unit 6 in a retrievable manner as described. The intended use of the lighting module 1 may include, for example, the preferred application of the lighting module 1 in a motor vehicle lamp 10.

[0090] Figure 4b A third flow chart is shown. Figure 4c The third flowchart is described alternately. Figure 4c The timing diagram shows a further embodiment of the method with a first time range T1 and a second time range T2 . The timing diagram also shows a light control signal 31 and a deflection control signal 41 .

[0091] The third flow chart relates to a motor vehicle 100 with a corresponding lighting module 1. In this case, data of the motor vehicle 100 are continuously processed. The module control unit 2 can be configured to receive and process corresponding control parameters with data of the motor vehicle 100 and, based thereon, to send a light control signal 31 and a deflection control signal 41. These data of the motor vehicle 100 can include information about at least one of the following standards:

[0092] -Target light function

[0093] -Ambient temperature

[0094] - Ambient brightness

[0095] -Lighting module status

[0096] - Vehicle speed.

[0097] In this case, the criteria for the target light function can include a description of the required light scene. For example, the required light scene can be a dynamic ADB function (adaptive high beam) or a ground projection. The ground projection here refers, for example, to the presence of a target image S with a plurality of stable light and dark curves, which together form a logo. However, the required light scene is not limited to the examples presented. It is also possible that the required light scene includes a combination of a dynamic ADB function and a ground projection.

[0098] The ambient temperature may include the ambient temperature of the motor vehicle 100, the ambient temperature of the motor vehicle lamp 10, the ambient temperature of the lighting module 1 and / or preferably the ambient temperature of the deflection unit 4. In this case, the ambient temperature refers, for example, to the instantaneous temperature of the mentioned object.

[0099] The ambient brightness may include the ambient brightness of motor vehicle 100 .

[0100] The lighting module state may include the state of one or more components of the lighting module 1. For example, the lighting module state includes an actuator state or a memory unit state. The actuator state may describe the state of the deflection unit 4. The actuator state may be, for example, in a "faulty" state or a "non-faulty" state. A faulty actuator state may, for example, describe a state in which the deflection unit 4 is unable to perform a prescribed repetitive light deflection. The memory unit state may describe the state of the memory unit 6.

[0101] The vehicle speed may include the speed of the motor vehicle 100 .

[0102] According to the third flow chart, the data of motor vehicle 100 are processed accordingly in order to obtain a decision basis for activating or deactivating the repeated light deflection by deflection unit 4 and for emitting first low-resolution image A or second low-resolution image B.

[0103] If, for example, a floor projection is required as a light scene during operation, the module control unit 2 can, according to another embodiment of the method, call up a previously stored first low-resolution image A and send a corresponding light control signal 31 to the light source 3. Furthermore, a corresponding deflection control signal 41 can be sent by the module control unit 2 to the deflection unit 4 in order to activate a repeated deflection by the deflection unit 4.

[0104] The sending of the light control signal 31 for emitting the first low-resolution image A and / or the sending of the deflection control signal 41 for activating the repeated deflection by the deflection unit 4 can start the first time range T1 and, if necessary, end the second time range T2 - provided that the second time range has been started before. It is important that in the first time range T1, the first low-resolution image A is emitted by the light module 1 and the first low-resolution image A is repeatedly deflected by the deflection unit 4 within the first time range T1.

[0105] If, for example, a faulty actuator state is present, then according to another embodiment of the method, the module control unit 2 can call up a previously stored second low-resolution image B and send a corresponding light control signal 31 to the light source 3. Furthermore, a corresponding deflection control signal 41 can be sent by the module control unit 2 to the deflection unit 4 in order to terminate any repetitive light deflection by means of the deflection unit 4.

[0106] The sending of the light control signal 31 for emitting the second low-resolution image B and / or the sending of the deflection control signal 41 for deactivating the deflection unit 4 can start the second time range T2 and, if necessary, terminate the first time range T1, provided that the first time range has been started before. It is important that in the second time range T2, the second low-resolution image B is emitted by the light module 1 and that in the second time range T2, the second low-resolution image B is not repeatedly deflected by means of the deflection unit 4.

[0107] Thus, the duration and / or the start time of the first time range T1 and the duration and / or the start time of the second time range T2 can be determined by at least one control parameter, wherein the at least one control parameter contains information about at least one of the above-mentioned standards. This is of course based on the premise that the lighting module 1 itself is activated. A deactivated lighting module 1 or a deactivated vehicle lamp 10 or a lighting module 1 that is not activated due to other influences does not allow such time ranges T1, T2 to exist and will not be discussed here. However, it is clear that a lighting module 1 that is about to be deactivated due to other influences will forcibly end the first time range T1 that may have existed before or the second time range T2 that may have existed before.

[0108] The opening of the second time range T2 is not bound to the existence of the previous first time range T1. Similarly, the opening of the first time range T1 is not bound to the existence of the previous second time range T2. It is also possible to open multiple first time ranges T1 one after another in time. It is also possible to open multiple second time ranges T2 one after another in time. It is also possible to open the first time range T1 and the second time range T2 alternately one after another multiple times.

[0109] For example, the ambient temperature can be processed so that the ambient temperature of the actuator unit 4 up to an upper limit value causes the emission of a first low-resolution image A with repeated light deflections, and the ambient temperature of the actuator unit 4 from the upper limit value causes the emission of a second low-resolution image B without repeated light deflections. The upper limit value of the ambient temperature of the actuator unit 4 can be between 40° C. and 85° C.

[0110] For example, the ambient brightness can be processed so that the ambient brightness up to an upper limit causes the emission of a first low-resolution image A accompanied by repeated light deflection, and the ambient brightness from the upper limit causes the emission of a second low-resolution image B without repeated light deflection. Here, the upper limit value of the ambient brightness can be between 1000 lux and 7000 lux.

[0111] The vehicle speed may be processed so that the vehicle speed up to an upper limit value causes the emission of a first low-resolution image A accompanied by repeated light deflection, and the vehicle speed from the upper limit value causes the emission of a second low-resolution image B without repeated light deflection. Here, the upper limit value of the vehicle speed may be between 2 and 30 km / h.

[0112] Figure 5 A comparison of an exemplary target image S, a first low-resolution image A converted from the target image, the low-resolution image A superimposed with itself, and a second low-resolution image B converted from the target image S is shown.

[0113] Although the same reference numerals as in the previous description of the figures are used in part in the description of the figures, the embodiments may be different in part. For ease of illustration, other resolutions are shown by way of example. Therefore, the aspects described herein are not limited to the aspects already mentioned, but rather demonstrate the multifaceted applicability of the invention, which is defined by the entire scope of protection of the claims.

[0114] Here, the target image S has an exemplary target light distribution LV. The exemplary target light distribution LV includes a plurality of continuous light-dark curves C, which together form a symbol. A stable light-dark curve C is a gapless separation line between bright areas and dark areas. The transition between bright areas and dark areas can also be smoothly formed. The target image S shown in the form of the target light distribution LV has a resolution that exceeds the resolution of the light module 1. Specifically, the target image S shown in the figure has a resolution of 160×160. Therefore, the target image S shown includes 160×160 target light intensity values.

[0115] Furthermore, a first low-resolution image A converted according to the method can be seen. The first low-resolution image A has a resolution of 80×80. In the present case, a resolution of 80×80 corresponds to the resolution of the lighting module 1. The low-resolution image A shown therefore includes 80×80 light intensity values.

[0116] According to the method, a first low-resolution image A is emitted by a light module 1 and repeatedly deflected by means of a deflection unit 4. In the figure, the resulting superposition of the first low-resolution image A with itself can be seen in the third image from the top. Due to the repeated light deflection, the resolution perceived by the human eye is increased compared to the native resolution of 80×80. The degree of deflection in the present case essentially corresponds to a vertical offset of half the width of the light segment and a horizontal offset.

[0117] A comparison of the first low-resolution image A shown here and transformed by means of the first transformation rule with the target image S shows a structural similarity of 0.89. In contrast, a comparison of the target image S with the low-resolution image A visually superimposed on itself shows a structural similarity of 0.93. Therefore, the image perception of the first low-resolution image A visually superimposed on itself is more similar to the target image S than the projection of the first low-resolution image A itself. Here, the similarity is evaluated by means of the structural similarity index measure (SSIM—structure similarity index measure), which requires partial scaling of the corresponding resolution. However, other suitable algorithms for comparing images are also known.

[0118] Furthermore, a second low-resolution image B converted according to another embodiment of the method can be seen. The second low-resolution image B also has a resolution of 80×80.

[0119] According to another embodiment of the method, the second low-resolution image B is emitted by the light module 1 and is not repeatedly deflected by the deflection unit 4. The second low-resolution image B itself is thus not superimposed. The comparison of the second low-resolution image B and the target image S shown here shows a structural similarity of 0.92. Therefore, compared with the first low-resolution image A, the second low-resolution image B itself has an image perception that is closer to the target image S.

[0120] Now, Figure 6 Finally, a motor vehicle 100 is shown with a light module 1 for a motor vehicle lamp 10. The light module 1 is located in a specified installation position. The motor vehicle 100 and / or the light module 1 are configured to at least partially control the method. The motor vehicle 100 can be configured to implement a first part of the method, for example step a) and step b). The light module 1 is configured to be controlled at least according to step c) of the method. The motor vehicle 100 and / or the light module 1 can also be configured to implement all steps of the method. Preferably, an external computing unit 7 is configured to implement steps a) and b) of the method, wherein the external computing unit is not part of the light module 1.

[0121] The invention is not limited to the embodiments and designs of the method shown, but is defined by the entire scope of protection of the claims. Individual aspects of the invention or the embodiments may also be adopted and combined with one another. Possible reference numerals in the claims are exemplary and serve only to make the claims easier to read, without limiting the claims.

[0122] Reference numerals list

[0123] 1 Light emitting module

[0124] 2 Module control unit

[0125] 3 Light Source

[0126] 4 Deflection unit

[0127] 5 Projection unit

[0128] 6 Memory Unit

[0129] 7 External computing unit

[0130] 10 Headlights

[0131] 30 Beam

[0132] 31 Light control signal

[0133] 41 Deflection control signal

[0134] 42 Glass

[0135] 50 Projection

[0136] 52 Deflected projection

[0137] 100 Motor Vehicles

[0138] A first low-resolution image

[0139] B The second low resolution image

[0140] C Value Curve

[0141] LV target light distribution

[0142] P Projection angle range

[0143] S Target image

[0144] x Pivot axis.

Claims

1. A method for controlling a light module (1) for a motor vehicle lamp (10) in a resolution-optimized manner, wherein: The lighting module (1) is configured to emit a segmented light distribution having individually controllable light segments (51), wherein the lighting module (1) comprises a deflection unit (4), via which a native resolution of the lighting module (1) can be visually increased by at least temporary light deflection by means of the deflection unit (4), wherein the method comprises the following steps: a) receiving a target image (S), wherein the target image (S) has a resolution exceeding the native resolution of the light emitting module (1); b) converting the target image (S) received in step a) into a first low-resolution image (A) according to a first conversion rule, wherein the first low-resolution image (A) is selected so that the first low-resolution image has the native resolution of the light-emitting module (1), and wherein the first low-resolution image (A) is additionally selected so that at least part of the visual superposition of itself obtains the following image perception: the image perception is closer to the target image (S) than the projection of the first low-resolution image (A) itself; c) controlling a light-emitting module, wherein the control is performed so that the first low-resolution image (A) converted according to step b) is emitted by the light-emitting module (1) within a first time range (T1), wherein, within the first time range (T1), the first low-resolution image (A) is repeatedly deflected by means of the deflection unit (4) so ​​that within the first time range (T1), the first low-resolution image (A) is visually at least partially superimposed with itself.

2. The method according to claim 1, wherein: The deflection unit (4) is configured to repeatedly deflect the first low-resolution image (A) at a frequency of at least 30 Hz within the first time range (T1), typically, repeatedly deflecting the first low-resolution image (A) at a frequency between 30 Hz and 160 Hz within the first time range (T1).

3. A method according to any one of the preceding claims, wherein: The lighting module (1) has individually controllable light segments (51), wherein the light distribution is segmented by the individually controllable light segments (51), and the light segments are arranged side by side without gaps in a matrix with a resolution of at least two rows and two columns.

4. The method according to claim 3, wherein: Preferably, it is provided that the maximum deflection performed by the deflection unit (4) is designed so that: compared with a reference state in which no deflection occurs, the deflected state has a vertical offset of half the light segment width and a horizontal offset, so that in the case of a maximum amplitude of deflection - with the exception of edge light segments - each deflected light segment (51) is essentially visually superimposed on four undeflected light segments (51).

5. A method according to any one of the preceding claims, wherein: The first transformation rule comprises an at least approximate solution of a system of linear equations comprising a collection of linear equations containing information of the target image (S) with respect to the first low-resolution image (A) at least partially superimposed on itself.

6. A method according to any one of the preceding claims, wherein: The first transformation rule is implemented by an external computing unit (7), wherein the first low-resolution image (A) is preferably stored in a memory unit (6) of the lighting module (1) in a retrievable manner.

7. A method according to any one of the preceding claims, wherein: In the step b), the target image (S) received in accordance with step a) is additionally converted into a second low-resolution image (B) according to a second conversion rule, wherein the second low-resolution image (B) is selected so that the second low-resolution image has the native resolution of the light-emitting module (1), wherein the second low-resolution image (B) is additionally selected so that the second low-resolution image itself has an image appearance that is closer to the target image (S) than the first low-resolution image (A), wherein in step c), the second low-resolution image (B) is emitted by the light-emitting module (1) within a second time range (T2), wherein within the second time range (T2), the second low-resolution image (B) is no longer repeatedly deflected by means of the deflection unit (4).

8. The method according to claim 7, wherein: The second conversion rule comprises a scaling method, in which the second low-resolution image (B) is completely converted from information of the target image (S).

9. The method according to claim 7 or 8, wherein: The duration and / or start time of the first time range (T1) and the duration and / or start time of the second time range (T2) are determined by at least one control parameter, wherein the at least one control parameter contains information about at least one of the following standards: target light function, ambient temperature, ambient brightness, light module status, vehicle speed.

10. The method according to any one of claims 7 to 9, wherein: The second transformation rule is implemented by an external computing unit (7).

11. The method according to any one of claims 7 to 10, wherein: The first low-resolution image (A) converted according to step b) and the second low-resolution image (B) converted according to step b) are stored in a retrievable manner in a memory unit (6) in a substep b1) before step c).

12. A method according to any one of the preceding claims, wherein: The target image (S) has at least one stable light-dark curve (C), preferably, the target image (S) has a plurality of stable light-dark curves (C), and the light-dark curves together form a symbol.

13. A lighting module (1) for a motor vehicle lamp (10), wherein: The light-emitting module (1) is configured to emit a segmented light distribution, wherein the light-emitting module (1) comprises a deflection unit (4), via which a visually perceptible resolution of the light distribution generated by the light-emitting module (1) can be increased relative to a native resolution of the light-emitting module (1), wherein the light-emitting module (1) is configured to be controlled at least in accordance with step c) of the method according to any of the preceding claims.

14. The lighting module (1) according to claim 13, wherein: The light emitting module (1) further comprises a memory unit (6) and a module control unit (2). The memory unit (6) is configured to store at least one first low-resolution image (A) and at least one second low-resolution image (B). The module control unit (2) is configured to call the first low-resolution image (A) and the second low-resolution image (B) from the memory unit (6) and send a light control signal (31) to the light source (3), so that the first low-resolution image (A) or the second low-resolution image (B) is emitted from the light emitting module (1). The module control unit (2) is further configured to control the deflection unit (4) so ​​that when the light-emitting module (1) emits the first low-resolution image (A), the deflection unit repeatedly deflects the first low-resolution image (A); and the module control unit (2) is further configured to control the deflection unit (4) so ​​that when the light-emitting module (1) emits the second low-resolution image (B), the deflection unit no longer repeatedly deflects the second low-resolution image (B).

15. A motor vehicle (100) having a lighting module (1) according to any one of claims 13 or 14, wherein: The motor vehicle (100) and / or the light module (1) are configured to at least partially implement the method according to any one of claims 1 to 12.

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