Testing method for headlamps, and testing device
A quality testing method is provided for a light source in a headlamp, in which the light source contains a matrix of light pixels that can be controlled individually. The light pixels are activated individually according to a test procedure, such that the light source emits light corresponding to a test pattern. The test pattern is recorded by an optical recorder, and the test pattern is compared with a reference pattern with regard to brightness and/or color value.
1 . A quality testing method for a light source in a headlamp, wherein the light source contains a matrix of light pixels, the method comprising the steps of:
controlling the light pixels according to a test procedure such that the light source emits light corresponding to a test pattern;
recording the test pattern by an optical recorder;
comparing the test pattern with a reference pattern with regard to brightness and/or color value;
wherein in a first step, test patterns are generated in which the square light pixel arrays contain relatively few light pixels, and the test patterns are scanned and compared with a reference pattern, and
when the test pattern differs from the reference pattern by more than a predefined threshold value, further test patterns are generated in a second step, in which the square light pixel arrays contain a greater number of light pixels than in the first step; and
wherein an operating control signal is generated for each light pixel based on the comparison of the scanned test pattern with the predefined reference patterns, such that differences in adjacent light pixels with regard to brightness and/or color values are compensated for.
2 . The method according to claim 1 , wherein a plurality of test patterns are generated and recorded successively by activating different light pixels, wherein the light pixels in the test patterns that are switched on are surrounded by a predefined number of light pixels that are switched off.
3 . The method according to claim 2 , wherein the test patterns are generated by sequentially activating individual light pixels in a predefined group of light pixels, while other light pixels in the group of light pixels are switched off, and the sequentially generated test patterns are each recorded by the optical recorder.
4 . The method according to claim 2 , wherein the test patterns are generated in accordance with the test procedure through sequentially activating the individual light pixels in a predefined group of light pixels, wherein the light pixels in the predefined group are contained in a light pixel array, each of which is composed of a square matrix that has the same number of rows and columns.
5 . The method according to claim 2 , wherein the test patterns are generated in accordance with the test procedure through sequentially activating the light pixels in the respective square light pixel arrays, wherein the light pixels are switched on at the same locations in the square light pixel arrays.
6 . The method according to claim 1 , wherein the reference pattern is composed of the reference brightness values and/or reference color values assigned to the light pixels.
7 . The method according to claim 6 , wherein the reference brightness values and/or reference color values for the light pixels that are switched on are the same.
8 . The method according to claim 6 , wherein the reference brightness values and reference color values are based on a light distribution that is to be generated by the headlamp, and/or an optical unit dedicated to the light source.
9 . A testing device for the method according to claim 1 , the testing device comprising:
an evaluation unit, in which an operating control signal is generated for each light pixel based on a difference between the test pattern and the reference patterns.
10 . The testing device according to claim 9 , further comprising a test control unit with which all of the light pixels that are to be switched on in the light pixel array are switched on with the same switching signal.
11 . The testing device according to claim 9 , wherein the test control unit is configured such that when each test pattern is activated, a single light pixel in the light pixel array is switched on, and the other light pixels in the same light pixel array are switched off.
12 . The testing device according to claim 9 , wherein the operating control signal can be stored in a memory in a control unit for the headlamp.
13 . The testing device according to claim 9 , wherein an optical recorder of the testing device is a camera.