Dead pixel avoiding method of pixel matrix light source and pixel matrix light source

Abstract

The invention discloses a pixel matrix light source dead pixel avoiding method and a pixel matrix light source. The pixel matrix light source dead pixel avoiding method comprises the following steps that S1, the pixel matrix light source is at least divided into a first area and a second area; s2, detecting a dead pixel of the pixel matrix light source, and determining the position of the dead pixel; s3, detecting whether all the dead pixels can be transferred to the first area by rotating the pixel matrix light source so as to avoid the dead pixels, if the dead pixels can be avoided, entering step S4, and if the dead pixels cannot be avoided, reporting a fault and entering step S5; s4, rotating the pixel matrix light source to transfer the dead pixels to the first area, and performing pixel compensation on the dead pixels transferred to the first area; and S5, ending. According to the pixel matrix light source, after the pixel matrix light source rotates around the center shaft by a certain angle, the pixel matrix light source completely coincides with the position of an original pixel matrix light source, the rotation angle of the pixel matrix light source is smaller than 360 degrees, and the pixel matrix light source avoids dead pixels through the dead pixel avoiding method. According to the pixel matrix light source dead pixel avoiding method and the pixel matrix light source, dead pixels are effectively avoided and compensated, it is ensured that the light source can be in a normal working state, and the reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamps, and in particular to a pixel matrix light source, and more particularly to a bad pixel avoidance method of the pixel matrix light source and the pixel matrix light source. Background Art

[0002] Pixel Matrix Headlights are a revolutionary technology in automotive lighting. By upgrading traditional headlight light sources to a high-density programmable pixel array, they enable dynamic and precise beam control. At its core, the technology divides the headlight into thousands of independently controllable micro-light-emitting units (pixels). Each pixel can be individually switched on or off, creating a highly flexible light distribution.

[0003] Pixel matrix headlights usually use Micro LED as the light-emitting unit. Combined with high-speed drive circuits, optical lens groups and intelligent control, the size of a single pixel can be as small as 50μm, achieving high-resolution light pattern adjustment.

[0004] The current pixel matrix headlight light source technology has the following major problems:

[0005] 1. Bad pixel sensitivity: All pixel units in traditional matrix light sources have the same function. Any bad pixel will cause a permanent light spot defect in the projection area, making it impossible to accurately convey information or achieve the expected projection effect.

[0006] 2. Brightness-precision contradiction: Existing designs cannot meet the requirements of high-brightness lighting and high-precision projection at the same time. Either the full matrix uses large pixel units, resulting in insufficient projection resolution, or the use of small pixel units results in insufficient lighting brightness.

[0007] 3. Insufficient redundancy design: Existing bad pixel compensation solutions mostly use spare pixel replacement or replacement of the entire light source module, which increases system complexity (requires additional circuits) and cannot solve the problem of regional concentrated bad pixels. Summary of the Invention

[0008] The technical problem to be solved by the present invention is: in order to solve the technical problem in the prior art that bad pixel interference causes damage to the lighting and projection functions, the present invention provides a bad pixel avoidance method and a pixel matrix light source, which effectively avoid and compensate for bad pixels, ensure that the light source can be in normal working condition, and improve reliability.

[0009] The technical solution adopted by the present invention to solve its technical problem is: a method for avoiding bad pixels of a pixel matrix light source, comprising the following steps: S1. dividing the pixel matrix light source into at least a first area and a second area; S2. detecting the bad pixels of the pixel matrix light source and confirming the locations of the bad pixels; S3. detecting whether the bad pixels can be transferred to the first area by rotating the pixel matrix light source to avoid the bad pixels; if the bad pixels can be avoided, proceeding to step S4; if the bad pixels cannot be avoided, reporting the fault and proceeding to step S5; S4. rotating the pixel matrix light source to transfer the bad pixels to the first area, performing pixel compensation on the bad pixels transferred to the first area; S5. ending.

[0010] The bad pixel avoidance method of the pixel matrix light source of the present invention can effectively avoid and compensate for the bad pixel by detecting the location of the bad pixel and rotating the pixel matrix light source to transfer the bad pixel to the first area, ensuring that the car light can still maintain good lighting and projection functions, thereby improving the reliability of the car light and driving safety.

[0011] Furthermore, in step S1, the upper half of the pixel matrix light source is divided into a first area, and the lower half is divided into a second area. Thus, if a bad pixel only appears in the second area, the bad pixel in the second area can be transferred to the first area by rotating the pixel matrix light source, thereby avoiding the bad pixel.

[0012] Furthermore, in order to enable the rotated pixel matrix light source to perform bad pixel compensation, in step S4, the light source driving parameters are reconfigured according to the rotation angle of the pixel matrix light source and then pixel compensation is performed on the bad pixels transferred to the first area.

[0013] The technical solution adopted by the present invention to solve its technical problem is: a pixel matrix light source, which completely overlaps with the position of the original pixel matrix light source after rotating a certain angle around the central axis, and the rotation angle of the pixel matrix light source is less than 360°. The pixel matrix light source adopts the above-mentioned bad pixel avoidance method to avoid bad pixels.

[0014] The pixel matrix light source of the present invention avoids bad pixels by using a bad pixel avoidance method, thereby ensuring that the vehicle lamp can still maintain good lighting and projection functions, thereby improving the reliability of the vehicle lamp and driving safety.

[0015] Furthermore, the pixel matrix light source includes pixel units, and a plurality of the pixel units are arranged in an array to form a pixel unit. Thus, the pixel matrix light source is formed by arranging and combining a plurality of pixel units.

[0016] Furthermore, the pixel units are square in structure and are evenly spaced to form a square pixel matrix light source. Thus, the pixel matrix light source can overlap itself after being rotated 90°, 180°, and 270°, thus avoiding bad pixels.

[0017] Furthermore, in order to realize the lighting and projection functions, the upper half of the pixel matrix light source is the lighting function area, and the lower half is the projection function area.

[0018] Furthermore, in order to ensure the lighting brightness, a plurality of adjacent pixel units in the lighting functional area form a minimum light-emitting unit, and bad pixels in the lighting functional area are compensated by adjusting the brightness of other surrounding pixel units.

[0019] Furthermore, in order to further refine the projection function, the projection function area includes a short-distance projection area, a medium-distance projection area and a driving interaction projection area arranged in sequence in the longitudinal direction.

[0020] Furthermore, in order to ensure projection accuracy, the minimum light-emitting unit of the driving interaction projection area and the medium-distance projection area is composed of four pixel units, and the minimum light-emitting unit of the close-distance projection area is composed of one pixel unit.

[0021] Furthermore, the lighting functional area is divided into a first lighting area and a second lighting area, and the projection functional area is divided into a first projection area and a second projection area. Thus, the first lighting area, the second lighting area, and the first projection area and the second projection area are located in four quadrants, and whether bad pixels in the projection area can be avoided can be determined based on the bad pixel conditions in each area.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The bad pixel avoidance method of the pixel matrix light source and the pixel matrix light source of the present invention identify the bad pixel position of the pixel matrix light source, transfer the bad pixel to the luminous illumination area by rotating the pixel matrix light source, avoid the bad pixel by pixel compensation, and still maintain good lighting and projection functions in the presence of bad pixels.

[0024] 2. The bad pixel avoidance method of the pixel matrix light source and the pixel matrix light source of the present invention form a square pixel matrix light source through pixel units, and construct a rectangular coordinate system with the center of the pixel matrix light source as the origin. The first illumination area, the second illumination area, the first projection area and the second projection area are located in four quadrants. Whether the bad pixels in the projection area can be avoided can be judged based on the bad pixel conditions of each area.

[0025] 3. The bad pixel avoidance method of the pixel matrix light source and the pixel matrix light source of the present invention use different numbers of pixel units in the lighting functional area in combination to form light-emitting units of different sizes, taking into account both high-brightness lighting and high-precision projection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] Figure 1Schematic diagram of the functional partitioning of the pixel matrix light source;

[0028] Figure 2 Schematic diagram of the position partitioning of the pixel matrix light source;

[0029] Figure 3 The figure is a flowchart of a method for avoiding bad pixels of a pixel matrix light source.

[0030] In the picture:

[0031] 1. Lighting functional area, 11. First lighting area, 12. Second lighting area, 13. Minimum light-emitting unit of lighting functional area;

[0032] 2. Projection function area, 21. Close-range projection area, 211. Minimum light-emitting unit of the close-range projection area, 22. Medium-range projection area, 221. Minimum light-emitting unit of the medium-range projection area, 23. Driving interaction projection area, 231. Minimum light-emitting unit of the driving interaction projection area, 24. First projection area, 25. Second projection area;

[0033] 3. Pixel unit;

[0034] 4. Bad pixels. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] In Example 1, a pixel matrix light source is described. In this embodiment, the pixel matrix light source is rotated around its central axis by a certain angle, so that the position of the original pixel matrix light source completely overlaps, and the rotation angle of the pixel matrix light source is less than 360°. This allows the pixel matrix light source to avoid and compensate for bad pixels 4. The specific compensation method is described in detail below.

[0039] like Figure 1 As shown, the upper half of the pixel matrix light source is the lighting function area 1, and the lower half is the projection function area 2. It should be noted that the lighting function area 1 and the projection function area 2 are preset areas according to the lighting needs of the light source, and the pixel units 3 located in these areas perform corresponding functions.

[0040] Specifically, the pixel matrix light source includes pixel units 3, and multiple pixel units 3 are arranged in an array to form a pixel matrix light source. The pixel units 3 are arranged in N rows x N columns to form a square pixel matrix light source. In this case, after the pixel matrix light source is rotated 90°, 180°, or 270°, the rotated pixel matrix light source overlaps with the pixel matrix light source before rotation.

[0041] Preferably, a plurality of adjacent pixel units 3 in the lighting functional area 1 form a minimum light-emitting unit, and the bad pixel 4 in the lighting functional area 1 is compensated by adjusting the brightness of other pixel units 3 in the same minimum light-emitting unit.

[0042] Preferably, the projection function area 2 includes a short-distance projection area 21, a medium-distance projection area 22 and a driving interaction projection area 23 which are arranged in sequence in the longitudinal direction.

[0043] Preferably, the minimum light-emitting unit of the driving interaction projection area 23 and the medium-distance projection area 22 is composed of four pixel units 3, and the minimum light-emitting unit of the close-distance projection area 21 is composed of one pixel unit 3.

[0044] Specifically, the lighting functional area 1 is divided into a first lighting area 11 and a second lighting area 12 , and the projection functional area 2 is divided into a first projection area 24 and a second projection area 25 .

[0045] like Figure 2A rectangular coordinate system is constructed with the center of the pixel matrix light source as the origin, which is divided into four quadrants. The first quadrant is the first illumination area 11, the second quadrant is the second illumination area 12, the third quadrant is the first projection area 24, and the fourth quadrant is the second projection area 25. The presence of bad pixels 4 in each area can be used to determine whether bad pixels 4 in the projection function area 2 can be avoided.

[0046] A method for avoiding bad pixels 4 of a pixel matrix light source, comprising the following steps:

[0047] S1. Initialize the pixel matrix headlights and divide the pixel matrix light source into at least a first area and a second area.

[0048] In this embodiment, the upper half of the pixel matrix light source is the first area (ie, the lighting function area 1 ), and the lower half is the second area (ie, the projection function area 2 ).

[0049] S2. Detect the bad pixel 4 of the pixel matrix light source and confirm the location of the bad pixel 4.

[0050] Specifically, it first performs a power-on self-test to ensure that all circuits are working properly, then automatically calibrates the light source rotation angle to accurately position the projection function area 2 and the lighting function area 1, then loads the preset brightness and compensation parameters, and finally passes a safety verification to ensure that the light type is normal. The entire initialization process is completed within 0.5 seconds, and the system automatically records the information of bad pixel 4 and then enters the standby ready state.

[0051] The status of the pixel matrix light source can be determined and reported using an ASIC chip that collects the electrical signals from each pixel unit 3. Alternatively, the LED pixels can be scanned one by one, and the light signals from each pixel can be collected and determined using a high-precision photoelectric sensor. The coordinates of any detected bad pixels 4 can also be stored.

[0052] S3. Check whether the bad pixels 4 can be all transferred to the first area by rotating the pixel matrix light source to avoid the bad pixels 4. If the bad pixels 4 can be avoided, go to step S4. If the bad pixels 4 cannot be avoided, report the fault and go to step S5.

[0053] In this embodiment, the logic for determining whether the point change can be avoided is as follows:

[0054]

[0055] Specifically, the coordinates of the detected bad pixel are compared with the coordinate ranges of the four quadrants to determine which position area each bad pixel is located in. The bad pixel situation in each quadrant is used to determine whether the bad pixel in the projection area can be avoided by rotating the light source.

[0056] If it is determined that the bad pixel in the projection area cannot be avoided, the fault will be reported; if it is determined that it can be avoided, the pixel matrix light source will be rotated.

[0057] S4. Rotate the pixel matrix light source so that the bad pixels are transferred to the first area, and perform pixel compensation on the bad pixels transferred to the first area. After the rotation of the pixel matrix light source, the bad pixels must all be located within the lighting functional area 1. Reconfigure the light source driving parameters based on the rotation angle of the pixel matrix light source to allocate them to each functional area, and finally perform pixel compensation on the bad pixels transferred to the lighting area.

[0058] S5. End.

[0059] The difference between the second embodiment and the first embodiment is that a rhombus-shaped pixel matrix light source can be formed by multiple pixel units 3, and the above method can also be used to avoid bad pixels.

[0060] The third embodiment differs from the first embodiment in that a circular pixel matrix light source can be formed by multiple pixel units 3, and the above method can also be used to avoid bad pixels.

[0061] Of course, other pixel matrix light sources of other shapes with both central symmetry and axial symmetry can also achieve the above functions, which will not be described here.

[0062] In summary, the bad pixel avoidance method of the pixel matrix light source and the pixel matrix light source of the present invention effectively avoid and compensate for bad pixels, ensure that the light source can be in a normal working state, and improve reliability.

[0063] The above description is intended to serve as a guide for the preferred embodiments of the present invention. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A method for avoiding bad pixels in a pixel matrix light source, characterized in that: The following steps are involved: S1. Dividing the pixel matrix light source into at least a first area and a second area; S2. Detecting the bad pixel (4) of the pixel matrix light source and confirming the location of the bad pixel (4); S3. Detect whether the bad pixel (4) can be completely transferred to the first area by rotating the pixel matrix light source to avoid the bad pixel (4). If the bad pixel (4) can be avoided, proceed to step S4. If the bad pixel (4) cannot be avoided, report the fault and proceed to step S5. S4. Rotating the pixel matrix light source so that the bad pixel (4) is transferred to the first area, and performing pixel compensation on the bad pixel (4) transferred to the first area; S5. End.

2. The method for avoiding bad pixels of a pixel matrix light source according to claim 1, wherein: In step S1 , the upper half of the pixel matrix light source is divided into a first area, and the lower half is divided into a second area.

3. The method for avoiding bad pixels of a pixel matrix light source according to claim 1, wherein: In the step S4, the light source driving parameters are reconfigured according to the rotation angle of the pixel matrix light source, and then pixel compensation is performed on the bad pixels (4) transferred to the first area.

4. A pixel matrix light source, characterized in that: After the pixel matrix light source rotates around the central axis by a certain angle, the position of the pixel matrix light source completely coincides with the position of the original pixel matrix light source. The rotation angle of the pixel matrix light source is less than 360°. The pixel matrix light source adopts the bad pixel avoidance method described in any one of claims 1 to 3 to avoid bad pixels (4).

5. The pixel matrix light source according to claim 4, characterized in that: The pixel matrix light source comprises a pixel unit (3), and a plurality of the pixel units (3) are arranged in an array to form a pixel matrix light source.

6. The pixel matrix light source according to claim 5, characterized in that: The pixel units (3) are of a square structure and are evenly spaced and arranged to form a square pixel matrix light source.

7. The pixel matrix light source according to claim 6, characterized in that: The upper half of the pixel matrix light source is a lighting functional area (1), and the lower half is a projection functional area (2).

8. The pixel matrix light source according to claim 7, characterized in that: A plurality of adjacent pixel units (3) within the lighting functional area (1) form a minimum light-emitting unit, and a bad pixel (4) in the lighting functional area (1) is compensated by adjusting the brightness of other surrounding pixel units (3).

9. The pixel matrix light source according to claim 7, characterized in that: The projection function area (2) comprises a short-distance projection area (21), a medium-distance projection area (22) and a driving interaction projection area (23) which are arranged in sequence in the longitudinal direction.

10. The pixel matrix light source according to claim 9, characterized in that: The minimum light-emitting unit of the driving interactive projection area (23) and the medium-distance projection area (22) is composed of four pixel units (3), and the minimum light-emitting unit of the short-distance projection area (21) is composed of one pixel unit (3).

11. The pixel matrix light source according to claim 8, characterized in that: The lighting functional area (1) is divided into a first lighting area (11) and a second lighting area (12), and the projection functional area (2) is divided into a first projection area (24) and a second projection area (25).

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