Method for improving performance of optical waveguide module using pixel compensation

Abstract

The present invention provides a method for improving the performance of an optical waveguide module using pixel compensation. The method comprises: step S1: obtaining a camera and an optical waveguide module to be tested, placing the camera at the exit pupil position of the optical waveguide module, and importing a target image into the camera; step S2: lighting up multiple LED panels of an optical machine in the optical waveguide module multiple times; step S3: comparing and analyzing the display images of multiple colors obtained by lighting up multiple LED panels captured by the camera multiple times with the target image, and obtaining the comparative analysis results; step S4: calculating the pixel coordinate point deviation based on the comparative analysis results, dividing the full pixel area of ​​the multiple LED panels into an effective display area and a correction area, and selectively lighting and shutting down the pixels in the correction area based on the pixel coordinate point deviation to reduce the pixel coordinate point deviation. The present invention solves the problem in the prior art that the optical machine position deviation of the optical waveguide module affects the performance stability.

Description

Technical Field

[0001] The present invention relates to the technical field of near-eye display devices, and in particular to a method for improving the performance of an optical waveguide module by utilizing pixel compensation. Background Art

[0002] With the continuous development of near-eye display, various types of portable near-eye display devices have received widespread attention in the market, especially optical waveguide modules, which are gradually favored by the public due to their miniaturization. There are two main types of optical machines in optical waveguide modules. One is the X-Cube Micro LED optical machine (abbreviated as X-Cube optical machine), which can be referred to Figure 2 The X-Cube light machine consists of three separate red, green, and blue LED panels that are coupled through a cube prism and an imaging lens to emit white light that enters the waveguide for imaging; the other is a combined color light machine that uses three parallel sub-light machines with different colors. There are three coupling gratings on the waveguide, corresponding to three different red, green, and blue sub-light machines. These three sub-light machines will only emit red, green, and blue light, and then these three colors of light enter the red, green, and blue coupling gratings respectively, and finally synthesize colored light through the waveguide and project it into the human eye. Figure 3 .

[0003] However, both types of optical machines in the existing technology have some problems. The waveguide solution of the X-Cube optical machine needs to calibrate the assembly accuracy of the red, green, and blue LED panels at the same time during the assembly process, which includes controlling the horizontal offset, vertical offset, rotation angle offset, horizontal tilt angle offset, and vertical tilt angle offset between the red, green, and blue LED panels and the three surfaces of the cube prism. There are too many variables that need to be controlled during the assembly process. Currently, the relative position accuracy between these components is mainly guaranteed by the accuracy of mechanical structural parts. Therefore, extremely high requirements are placed on the machining accuracy of mechanical structural parts. However, in actual situations, existing processing jigs often find it difficult to meet such high-precision requirements. There are usually position deviations between the red, green, and blue LED panels and the cube prism. Figure 4 .

[0004] The waveguide solution for the combined color light engine also requires controlling the relative positional relationship (horizontal offset, vertical offset, rotation angle offset, horizontal tilt angle offset, and vertical tilt angle offset) between the LED display panels of the red, green, and blue sub-light engines and the three coupling gratings on the waveguide. Moreover, once the three single-color sub-light engines are packaged, it is difficult to correct these relative position deviations by adjusting the LED panels. Therefore, this solution places higher precision requirements on the mechanical structure, which is usually difficult to meet in actual processing conditions. Figure 5 . Figure 6It shows the tilt angle of the LED panel in the horizontal direction; and the tilt angle of the LED panel in the vertical direction, the horizontal direction is the X axis, and the vertical direction is the Y axis.

[0005] In other words, the optical waveguide module in the prior art has the problem that the optical-mechanical position deviation affects the performance stability. Summary of the Invention

[0006] The main purpose of the present invention is to provide a method for improving the performance of an optical waveguide module by using pixel compensation, so as to solve the problem in the prior art that the optical waveguide module has an optical-mechanical position deviation that affects the performance stability.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a method for improving the performance of an optical waveguide module by using pixel compensation, comprising the following steps: Step S1: obtaining a camera and an optical waveguide module to be tested, placing the camera at the exit pupil position of the optical waveguide module, and importing a target image into the camera; Step S2: lighting up multiple LED panels of an optical machine in the optical waveguide module multiple times; Step S3: comparing and analyzing display images of multiple colors obtained by lighting up multiple LED panels captured by the camera multiple times with the target image, and obtaining a comparison analysis result; Step S4: calculating the pixel coordinate point deviation based on the comparison analysis result, dividing the full pixel area of ​​the multiple LED panels into an effective display area and a correction area, and selectively lighting up and turning off the pixels in the correction area according to the pixel coordinate point deviation to reduce the pixel coordinate point deviation.

[0008] Furthermore, the method for improving the performance of the optical waveguide module using pixel compensation also includes step S5 located after step S4: when the pixel coordinate point deviation between the center pixel coordinates and edge pixel coordinates of the display images of multiple colors and the center pixel coordinates and edge pixel coordinates of the target image is within 5 pixels, the method ends.

[0009] Furthermore, when placing the camera at the exit pupil position of the optical waveguide module in step S1 , the distance between the camera and the optical waveguide module is adjusted to be within a range of greater than or equal to 10 mm and less than or equal to 30 mm.

[0010] Further, in step S3, the comparative analysis includes: determining whether the displayed image is translated in the horizontal and vertical directions relative to the target image; determining whether the displayed image has a tilt angle relative to the target image; and determining whether the displayed image is partially enlarged and / or partially reduced relative to the target image.

[0011] Furthermore, in step S2, the optical machine is an X-Cube optical machine, a combined color optical machine, or a single-panel full-color optical machine.

[0012] Further, in step S2, when the optical machine is an X-Cube optical machine, the comparative analysis and comparative analysis results of step S3 include the following situations: when the display image of one color in the display images of multiple colors is translated in the horizontal direction relative to the target image, there is a horizontal offset between the LED panel corresponding to the color of the X-Cube optical machine and the surface of the cube prism of the X-Cube optical machine; when the display image of one color in the display images of multiple colors is translated in the vertical direction relative to the target image, there is a vertical offset between the LED panel corresponding to the color of the X-Cube optical machine and the surface of the cube prism of the X-Cube optical machine; when the display image of one color in the display images of multiple colors is tilted at an angle relative to the target image, there is a rotational angle offset between the LED panel corresponding to the color of the X-Cube optical machine and the surface of the cube prism of the X-Cube optical machine.

[0013] Further, in step S2, when the optical machine is an X-Cube optical machine, the comparative analysis and comparative analysis results of step S3 include the following situations: when the display image of one color in the display images of multiple colors is at least partially enlarged and at least another part is reduced in the horizontal direction relative to the target image, then there is a horizontal tilt angle offset between the LED panel corresponding to the color of the X-Cube optical machine and the surface of the cube prism of the X-Cube optical machine; when the display image of one color in the display images of multiple colors is at least partially enlarged and at least another part is reduced in the vertical direction relative to the target image, then there is a vertical tilt angle offset between the LED panel corresponding to the color of the X-Cube optical machine and the surface of the cube prism of the X-Cube optical machine.

[0014] Further, in step S2, when the optical machine is a combined color optical machine, the comparative analysis and comparative analysis results of step S3 include the following situations: when the display image of one color in the display images of multiple colors is translated in the horizontal direction relative to the target image, there is a horizontal offset between the sub-optical machine corresponding to the color in the combined color optical machine and the coupling grating of the optical waveguide module; when the display image of one color in the display images of multiple colors is translated in the vertical direction relative to the target image, there is a vertical offset between the sub-optical machine corresponding to the color in the combined color optical machine and the coupling grating of the optical waveguide module; when the display image of one color in the display images of multiple colors has an inclination angle relative to the target image, there is a rotational angle offset between the sub-optical machine corresponding to the color in the combined color optical machine and the coupling grating of the optical waveguide module.

[0015] Further, in step S2, when the optical machine is a combined color optical machine, the comparative analysis and comparative analysis results of step S3 include the following situations: when the display image of one color in the display images of multiple colors is at least partially enlarged and at least another part is reduced in the horizontal direction relative to the target image, then there is a horizontal tilt angle offset between the sub-optical machine corresponding to the color in the combined color optical machine and the coupling grating of the optical waveguide module; when the display image of one color in the display images of multiple colors is at least partially enlarged and at least another part is reduced in the vertical direction relative to the target image, then there is a vertical tilt angle offset between the sub-optical machine corresponding to the color in the combined color optical machine and the coupling grating of the optical waveguide module.

[0016] Furthermore, in the process of dividing the full pixel areas of multiple LED panels into effective display areas and correction areas in step S4, the effective display area is located at the center of the full pixel area, and the correction area is continuously arranged around the outer periphery of the effective display area, and the effective display area and the correction area are pieced together to form a full pixel area.

[0017] Further, in step S4, when the comparative analysis result shows that there is a horizontal offset of the optical machine, it is calculated based on the comparative analysis result that there is a deviation of N pixels between the central pixel point of the displayed image and the central pixel point of the target image. When the central pixel point of the displayed image is located on the first side of the central pixel point of the target image, the N pixels in the correction area on the first side close to the effective display area are adjusted to light up, and the N pixels in the correction area on the second side close to the effective display area are adjusted to turn off, and the turned-off pixels and the turned-on pixels are symmetrically arranged on both sides of the effective display area; when the central pixel point of the displayed image is located on the second side of the central pixel point of the target image, the N pixels in the correction area on the first side close to the effective display area are adjusted to turn off, and the N pixels in the correction area on the second side close to the effective display area are adjusted to turn on, and the turned-off pixels and the turned-on pixels are symmetrically arranged on both sides of the effective display area.

[0018] The method for improving the performance of an optical waveguide module by using pixel compensation by applying the technical solution of the present invention includes the following steps: step S1: obtaining a camera and an optical waveguide module to be tested, placing the camera at the exit pupil position of the optical waveguide module, and importing a target image into the camera; step S2: lighting up multiple LED panels of an optical machine in the optical waveguide module multiple times; step S3: comparing and analyzing display images of multiple colors obtained by lighting up multiple LED panels captured by the camera multiple times with the target image, and obtaining a comparison analysis result; step S4: calculating the pixel coordinate point deviation based on the comparison analysis result, dividing the full pixel area of ​​the multiple LED panels into an effective display area and a correction area, and selectively lighting up and turning off the pixels in the correction area according to the pixel coordinate point deviation to reduce the pixel coordinate point deviation.

[0019] By lighting up multiple LED panels in the optical machine multiple times, display images of multiple colors are obtained. Then, by comparing and analyzing the multiple display images with the target image in turn, the comparison and analysis results are obtained. The pixel coordinate point deviation is calculated based on the actual results. Then, by adjusting the pixel coordinate point deviation to light up or turn off the pixels in the correction area corresponding to the pixel coordinate point deviation, correction is achieved. In response to the problems of mechanical processing of structural parts in the existing technology, this solution proposes a method of using pixel compensation to make up for the problem of insufficient optical machine processing accuracy. The relative position relationship between the LED panel and the cube prism or the coupled grating is guaranteed by software correction, and the imaging performance of the optical waveguide module is further improved. In addition, this method reduces the processing accuracy requirements for the optical machine, which is beneficial to improving product yield and reducing costs. By using a pure software method for calibration, the calibration difficulty is reduced and the operation is easy to implement. This method can calibrate the entire optical waveguide module after the optical machine is assembled, reducing the accuracy requirements of the optical waveguide module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 A flow chart showing a method for improving the performance of an optical waveguide module by using pixel compensation according to an optional embodiment of the present invention;

[0022] Figure 2 The figure shows the optical path diagram of the waveguide solution of the X-Cube optical machine in the prior art;

[0023] Figure 3 The figure shows an optical path diagram of a waveguide solution of a color combining light engine in the prior art;

[0024] Figure 4 Shown Figure 2 A comparison chart of the ideal and actual conditions of the X-Cube optical machine's waveguide solution during assembly;

[0025] Figure 5 Shown Figure 3 A comparison chart of the ideal and actual conditions of the waveguide solution of the color-combining light engine during assembly;

[0026] Figure 6 A schematic diagram showing the tilt angle of the LED panel in the horizontal direction and the tilt angle in the vertical direction;

[0027] Figure 7 A schematic diagram showing a full pixel area of ​​an LED panel of the optical engine of the present invention is shown;

[0028] Figure 8 A schematic diagram showing a target image in a camera of the present invention;

[0029] Figure 9 A schematic diagram showing a display image of the present invention is shown;

[0030] Figure 10 A schematic diagram showing a display image of the present invention being horizontally shifted relative to a target image;

[0031] Figure 11 A schematic diagram showing a display image of the present invention being translated vertically relative to a target image;

[0032] Figure 12 A schematic diagram showing a display image of the present invention having a tilt angle relative to a target image;

[0033] Figure 13 A schematic diagram showing a state in which a display image of the present invention appears relative to a target image;

[0034] Figure 14 A schematic diagram showing another state in which the display image of the present invention appears relative to the target image;

[0035] Figure 15 A state diagram showing the LED panel of the present invention during the calibration process;

[0036] Figure 16 A schematic diagram showing that the display image of the present invention meets the requirements relative to the target image;

[0037] Figure 17 A state diagram showing the LED panel brightness compensation by adjusting pixels according to the present invention.

[0038] The above drawings include the following reference numerals:

[0039] 10. Cube prism; 21. Red LED panel; 22. Green LED panel; 23. Blue LED panel; 30. Out-coupling grating; 41. Red sub-optical engine; 42. Green sub-optical engine; 43. Blue sub-optical engine; 51. Red in-coupling grating; 52. Green in-coupling grating; 53. Blue in-coupling grating; 61. Effective display area; 62. Correction area; 70. Target image; 80. Display image; 71. Center pixel of target image; 81. Center pixel of blue display image. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0042] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0043] In order to solve the problem in the prior art that optical waveguide modules have optical-mechanical position deviations that affect performance stability, the present invention provides a method for improving the performance of optical waveguide modules by utilizing pixel compensation.

[0044] like Figures 1 to 17 As shown, the method for improving the performance of an optical waveguide module by using pixel compensation includes the following steps: Step S1: obtaining a camera and an optical waveguide module to be tested, placing the camera at the exit pupil position of the optical waveguide module, and importing a target image 70 into the camera; Step S2: lighting up multiple LED panels of an optical machine in the optical waveguide module multiple times; Step S3: comparing and analyzing display images 80 of multiple colors obtained by lighting up multiple LED panels captured by the camera multiple times with the target image 70, and obtaining a comparison analysis result; Step S4: calculating the pixel coordinate point deviation based on the comparison analysis result, dividing the full pixel area of ​​the multiple LED panels into an effective display area 61 and a correction area 62, and selectively lighting up and turning off the pixels in the correction area 62 according to the pixel coordinate point deviation to reduce the pixel coordinate point deviation.

[0045] By lighting up the multiple LED panels in the optical machine multiple times, a display image 80 of multiple colors is obtained. Then, by comparing and analyzing the multiple display images 80 with the target image 70 in sequence, the comparison and analysis results are obtained. The pixel coordinate point deviation is calculated based on the actual results. Then, by adjusting the pixel coordinate point deviation, the pixel points in the correction area 62 corresponding to the pixel coordinate point deviation are turned on or off, thereby achieving correction. In response to the problems of mechanical processing of structural parts in the prior art, this solution proposes a method of using pixel compensation to compensate for the problem of insufficient optical machine processing accuracy. The relative position relationship between the LED panel and the cube prism 10 or the coupled grating is guaranteed by software correction, and the imaging performance of the optical waveguide module is further improved. In addition, this method reduces the processing accuracy requirements for the optical machine, which is conducive to improving product yield and reducing costs. By using a pure software method for calibration, the calibration difficulty is reduced and the operation is easy to implement. This method can calibrate the entire optical waveguide module after the optical machine is assembled, reducing the accuracy requirements of the optical waveguide module.

[0046] like Figure 7 As shown, in step S4, when the full pixel area of ​​the multiple LED panels is divided into an effective display area 61 and a correction area 62, the effective display area 61 is located at the center of the full pixel area, and the correction area 62 is continuously arranged around the outer periphery of the effective display area 61. The effective display area 61 and the correction area 62 form the full pixel area. In other words, the full pixel area includes all pixels and is divided into the effective display area 61 and the correction area 62. The effective display area 61 is the pixel area actually seen by the human eye, and the correction area 62 is the pixel area around the effective display area 61 that does not participate in the imaging. The pixels in this area will be used for software correction.

[0047] Specifically, the camera is an industrial camera, and the target image 70 is Figure 8 The implementation image shown, the display image 80 is Figure 9The dotted image shown. When placing the camera at the exit pupil position of the optical waveguide module in step S1, the distance between the camera and the optical waveguide module is adjusted to be greater than or equal to 10 mm and less than or equal to 30 mm. Placing the camera at a position corresponding to the outcoupling grating 30 of the optical waveguide module and adjusting the distance between the camera and the optical waveguide module to be greater than or equal to 10 mm and less than or equal to 30 mm is conducive to ensuring that the camera is within the exit pupil range of the optical waveguide module, so as to ensure that the camera can stably receive the image output by the optical waveguide module. Then, by lighting up the three LED panels of the optical machine three times, the three LED panels are respectively a red LED panel 21, a green LED panel 22, and a blue LED panel 23. The camera located at the exit pupil position of the optical waveguide module can receive the red display image, green display image, and blue display image of the three LED panels. By comparing and analyzing the three color display images 80 with the target image 70 in sequence, the three color display images 80 are evaluated in sequence, thereby achieving the sequential correction of the three LED panels.

[0048] Specifically, in step S3, the comparative analysis includes: determining whether the displayed image 80 is translated in the horizontal and vertical directions relative to the target image 70; determining whether the displayed image 80 has an inclination angle relative to the target image 70; determining whether the displayed image 80 is partially enlarged or partially reduced relative to the target image 70, and then determining the comparative analysis result of the displayed image 80, that is, the offset type, to facilitate the subsequent calculation of the pixel coordinate point deviation and ensure the calculation accuracy of the deviation.

[0049] In step S2, the optical machine is an X-Cube optical machine, a combined color optical machine, or a single-panel full-color optical machine. Figure 2 As shown, the X-Cube light machine includes a cube prism 10, a red LED panel 21, a green LED panel 22, and a blue LED panel 23. The three color LED panels should be set parallel to the three surfaces of the cube prism 10 respectively. The accuracy of the X-Cube light machine is closely related to the assembly accuracy of the three color LED panels and the three surfaces of the cube prism 10. Figure 3 As shown, the combined color optical machine includes three sub-optical machines, namely the red sub-optical machine 41, the green sub-optical machine 42 and the blue sub-optical machine 43. Usually, three coupling gratings are set on the corresponding waveguide plates, namely the red coupling grating 51, the green coupling grating 52 and the blue coupling grating 53. The three coupling gratings are set in a one-to-one correspondence with the three sub-optical machines, so that the three coupling gratings 30 couple in light of different colors respectively. During the actual assembly process, it is necessary to ensure that the light output by the three sub-optical machines is vertically incident on the coupling gratings.

[0050] In step S2, when the optical machine is an X-Cube optical machine, the comparative analysis and comparative analysis results in step S3 include the following situations:

[0051] like Figure 10 As shown, when a display image 80 of one color among the display images 80 of multiple colors shifts in the horizontal direction relative to the target image 70, there is a horizontal offset between the LED panel of the X-Cube light machine corresponding to the color and the surface of the cube prism 10 of the X-Cube light machine;

[0052] like Figure 11 As shown, when a display image 80 of one color among the display images 80 of multiple colors is translated in the vertical direction relative to the target image 70, there is a vertical offset between the LED panel of the X-Cube light machine corresponding to the color and the surface of the cube prism 10 of the X-Cube light machine;

[0053] like Figure 12 As shown, when one of the displayed images 80 of multiple colors is tilted relative to the target image 70, there is a rotational angle offset between the LED panel of the X-Cube light machine corresponding to the color and the surface of the cube prism 10 of the X-Cube light machine;

[0054] like Figure 13 As shown, when a display image 80 of one color among the display images 80 of multiple colors is at least partially enlarged and at least another part is reduced in the horizontal direction relative to the target image 70, there is a horizontal tilt angle offset between the LED panel corresponding to the color of the X-Cube light machine and the surface of the cube prism 10 of the X-Cube light machine; specifically, the part on the first side of the display image 80 is reduced, and the part on the second side is enlarged; as shown in the figure, the left side is the first side and the right side is the second side.

[0055] like Figure 14 As shown, when at least a portion of one of the multiple color display images 80 is vertically magnified and at least another portion is reduced relative to the target image 70, there is a vertical tilt angle offset between the LED panel corresponding to that color of the X-Cube light machine and the surface of the X-Cube prism 10. Specifically, a portion on the third side of the display image 80 is reduced, while a portion on the fourth side is magnified; as shown in the figure, the upper side is the third side, and the lower side is the fourth side.

[0056] In step S2, when the light engine is a combined color light engine, the comparative analysis and comparative analysis results in step S3 include the following situations:

[0057] like Figure 10 As shown, when a display image 80 of one color in the display images 80 of multiple colors shifts horizontally relative to the target image 70, there is a horizontal offset between the sub-optical engine corresponding to the color in the color combining light engine and the coupling grating of the optical waveguide module;

[0058] like Figure 11 As shown, when a display image 80 of one color in the display images 80 of multiple colors shifts in the vertical direction relative to the target image 70, there is a vertical offset between the sub-optical engine corresponding to the color in the color combining light engine and the coupling grating of the optical waveguide module;

[0059] like Figure 12 As shown, when a display image 80 of one color in the display images 80 of multiple colors is tilted relative to the target image 70, there is a rotational angle offset between the sub-optical engine corresponding to the color in the color combining engine and the coupling grating of the optical waveguide module;

[0060] like Figure 13 As shown, when a display image 80 of one color in a plurality of color display images 80 is at least partially enlarged and at least another part is reduced in the horizontal direction relative to the target image 70, there is a horizontal tilt angle offset between the sub-optical engine corresponding to the color in the combined color optical engine and the coupling grating of the optical waveguide module; specifically, a portion on the first side of the display image 80 is reduced, and a portion on the second side is enlarged; as shown in the figure, the left side is the first side and the right side is the second side.

[0061] like Figure 14 As shown, when at least a portion of one of the multiple color display images 80 is vertically magnified and at least another portion is reduced relative to the target image 70, a vertical tilt angle offset exists between the sub-optical engine corresponding to that color in the color combiner and the coupling grating of the optical waveguide module. Specifically, a portion on the third side of the display image 80 is reduced, while a portion on the fourth side is magnified; as shown in the figure, the upper side is the third side, and the lower side is the fourth side.

[0062] According to the above comparative analysis results, the pixel coordinate point deviation can be calculated. In step S4, when the comparative analysis result shows that the optical machine has a horizontal offset, it is calculated based on the comparative analysis result that there is a deviation of N pixels between the central pixel point of the display image 80 and the central pixel point of the target image 70. When the central pixel point of the display image 80 is located on the first side of the central pixel point of the target image 70, the N pixels of the correction area 62 on the first side close to the effective display area 61 are adjusted to light up, and the N pixels of the correction area 62 on the second side close to the effective display area 61 are adjusted to turn off, and the turned-off pixels and the lit pixels are adjusted to turn off. The pixels are symmetrically arranged on both sides of the effective display area 61; when the central pixel point of the displayed image 80 is located on the second side of the central pixel point of the target image 70, the N pixels in the correction area 62 on the first side close to the effective display area 61 are adjusted to be turned off, and the N pixels in the correction area 62 on the second side close to the effective display area 61 are adjusted to be lit, that is, the N pixel points in the correction area 62 on the first side of the effective display area 61 are adjusted to be turned off, and the N pixel points in the correction area 62 on the second side of the effective display area 61 are adjusted to be turned off, and the closed pixels and the lit pixels are symmetrically arranged on both sides of the effective display area 61.

[0063] like Figure 15 As shown, the present application performs software compensation for the aforementioned relative position offset by lighting up and adjusting the number and position of the pixels in the correction area 62. For example, we find that there is a horizontal offset of 6 pixels between the central pixel of the blue display image and the target image 70, and the central pixel 71 of the target image is on the first side (left side) of the central pixel 81 of the blue display image. We can light up 6 pixels in the correction area 62 near the second side (right side) edge of the effective display area 61, and turn off the 6 pixels in the correction area 62 near the first side edge of the effective display area 61 accordingly. Pixel points, since the state of the effective display area 61 is always on, pixel compensation can be achieved by controlling the lighting of the pixels at the corresponding positions of the correction area 62. Since the center pixel point 81 of the blue display image is offset to the right by six pixels relative to the center pixel point 71 of the target image, the six pixels in the correction area 62 on the left side of the effective display area 61 are adjusted to be turned off, and the six pixels in the correction area 62 on the right side of the effective display area 61 are adjusted to be lit. This can make the center pixel point 71 of the target image coincide with the center pixel point 81 of the blue display image, thereby achieving correction. In this way, we can complete the calibration in the horizontal offset direction without adjusting the internal structure of the optical machine. The implementation principle of other types of offset calibration is the same. The display images of green light and red light can be corrected by the same principle.

[0064] like Figure 16As shown, the method for improving the performance of the optical waveguide module using pixel compensation further includes step S5, which follows step S4: the method ends when the pixel coordinates of the center pixel coordinates and edge pixel coordinates of the multi-color display image 80 are within 5 pixels of the center pixel coordinates and edge pixel coordinates of the target image 70. In addition to calibrating the module's offset in various directions and angles as mentioned above, this method can also optimize and improve the quality of the optical waveguide module's display image 80. The specific implementation method is as follows:

[0065] 1. Place the camera at the exit pupil position of the optical waveguide module. The exit pupil position of the optical waveguide module is generally located 10mm-30mm away from the surface of the waveguide.

[0066] 2. Light up the red, green, and blue LED panels or light machines respectively, and use a CCD camera to capture the displayed images 80;

[0067] 3. Analyze the brightness distribution of the captured red, green, and blue display images 80;

[0068] If the brightness of a certain color light in a certain area is very low, we can specifically increase the brightness of the pixels in the corresponding display area of ​​the color light display panel to perform reverse brightness compensation and improve the overall display uniformity of the module. For example, if we find that the brightness of the red display image 80 in the center is particularly low in the captured display image 80, we can increase the brightness of the pixels in the corresponding center area within the effective display area 61 of the red display panel. Through this brightness compensation, we will eventually see an image with better color and brightness uniformity at the exit pupil position of the optical waveguide module, as shown in Figure 1. Figure 17 Blue and green can be optimized using the same principle.

[0069] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0071] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0072] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for improving the performance of an optical waveguide module using pixel compensation, characterized in that: The following steps are involved: Step S1: obtaining a camera and an optical waveguide module to be tested, placing the camera at the exit pupil position of the optical waveguide module, and importing a target image (70) into the camera; Step S2: lighting up multiple LED panels of the optical machine in the optical waveguide module multiple times; Step S3: performing comparative analysis on the display images (80) of multiple colors obtained by lighting up the multiple LED panels captured by the camera multiple times and the target image (70), and obtaining comparative analysis results; Step S4: Calculating pixel coordinate point deviations based on the comparative analysis results, dividing the full pixel area of ​​the plurality of LED panels into an effective display area (61) and a correction area (62), and selectively lighting and turning off pixels in the correction area (62) based on the pixel coordinate point deviations to reduce the pixel coordinate point deviations.

2. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 1, wherein: The method for improving the performance of the optical waveguide module by using pixel compensation further includes step S5 after step S4: The method ends when the pixel coordinate point deviation between the central pixel coordinates and the edge pixel coordinates of the display image (80) of the multiple colors and the central pixel coordinates and the edge pixel coordinates of the target image (70) is within 5 pixels.

3. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 1, wherein: When placing the camera at the exit pupil position of the optical waveguide module in step S1 , the distance between the camera and the optical waveguide module is adjusted to be within a range of greater than or equal to 10 mm and less than or equal to 30 mm.

4. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 1, wherein: In step S3, the comparative analysis includes: Determining whether the display image (80) is shifted in the horizontal direction and the vertical direction relative to the target image (70); determining whether the displayed image (80) has an inclination angle relative to the target image (70); Determine whether the displayed image (80) is partially enlarged and / or partially reduced relative to the target image (70).

5. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 1, wherein: In step S2, the optical machine is an X-Cube optical machine, a combined color optical machine, or a single-panel full-color optical machine.

6. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 5, wherein: In step S2, when the optical machine is the X-Cube optical machine, the comparative analysis and the comparative analysis results in step S3 include the following situations: When a display image (80) of one color among the display images (80) of the plurality of colors shifts in the horizontal direction relative to the target image (70), a horizontal offset exists between the LED panel corresponding to the color of the X-Cube light machine and the surface of the cube prism of the X-Cube light machine; When a display image (80) of one color among the plurality of color display images (80) is shifted in a vertical direction relative to the target image (70), a vertical offset exists between the LED panel corresponding to the color of the X-Cube light machine and the surface of the cube prism of the X-Cube light machine; When a display image (80) of one color among the display images (80) of the multiple colors is tilted relative to the target image (70), there is a rotational angle offset between the LED panel corresponding to the color of the X-Cube light machine and the surface of the cube prism of the X-Cube light machine.

7. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 5, wherein: In step S2, when the optical machine is the X-Cube optical machine, the comparative analysis and the comparative analysis results in step S3 include the following situations: When a display image (80) of one color among the plurality of color display images (80) is at least partially enlarged and at least another portion is reduced in the horizontal direction relative to the target image (70), there is a tilt angle offset in the horizontal direction between the LED panel corresponding to the color of the X-Cube light machine and the surface of the cube prism of the X-Cube light machine; When a display image (80) of one color among the display images (80) of the plurality of colors is at least partially enlarged and at least another portion is reduced in the vertical direction relative to the target image (70), there is a tilt angle offset in the vertical direction between the LED panel corresponding to the color of the X-Cube light machine and the surface of the cube prism of the X-Cube light machine.

8. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 5, wherein: In step S2, when the light engine is the combined color light engine, the comparative analysis and the comparative analysis results in step S3 include the following situations: When a display image (80) of one color among the display images (80) of the plurality of colors shifts in the horizontal direction relative to the target image (70), a horizontal offset exists between the sub-optical engine corresponding to the color in the combined color optical engine and the coupling grating of the optical waveguide module; When a display image (80) of one color among the display images (80) of the plurality of colors is translated in a vertical direction relative to the target image (70), a vertical offset exists between the sub-optical engine corresponding to the color in the combined color optical engine and the coupling grating of the optical waveguide module; When a display image (80) of one color among the display images (80) of the multiple colors has an inclination angle relative to the target image (70), there is a rotation angle offset between the sub-optical engine corresponding to the color in the combined light engine and the coupling grating of the optical waveguide module.

9. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 5, wherein: In step S2, when the light engine is the combined color light engine, the comparative analysis and the comparative analysis results in step S3 include the following situations: When a display image (80) of one color among the plurality of color display images (80) is at least partially magnified and at least another portion is reduced in the horizontal direction relative to the target image (70), there is a tilt angle offset in the horizontal direction between the sub-optical engine corresponding to the color in the combined color optical engine and the coupling grating of the optical waveguide module; When a display image (80) of one color among the display images (80) of the plurality of colors is at least partially magnified and at least another portion is reduced in the vertical direction relative to the target image (70), there is a tilt angle offset in the vertical direction between the sub-optical engine corresponding to the color in the combined color optical engine and the coupling grating of the optical waveguide module.

10. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 1, wherein: In the process of dividing the full pixel area of ​​the plurality of LED panels into the effective display area (61) and the correction area (62) in step S4, the effective display area (61) is located at the center of the full pixel area, the correction area (62) is continuously arranged around the outer periphery of the effective display area (61), and the effective display area (61) and the correction area (62) are combined to form the full pixel area.

11. The method for improving the performance of an optical waveguide module by using pixel compensation according to claim 10, wherein: In step S4, when the comparison analysis result indicates that the optical machine has a horizontal offset, it is calculated based on the comparison analysis result that there is a deviation of N pixels between the central pixel point of the display image (80) and the central pixel point of the target image (70). When the central pixel point of the display image (80) is located on the first side of the central pixel point of the target image (70), the N pixels at the position of the correction area (62) on the first side close to the effective display area (61) are adjusted to be lit, and the N pixels at the position of the correction area (62) on the second side close to the effective display area (61) are adjusted to be turned off, and the turned-off pixels and the lit pixels are symmetrically arranged on both sides of the effective display area (61); When the central pixel point of the display image (80) is located on the second side of the central pixel point of the target image (70), the N pixels at the position of the correction area (62) on the first side close to the effective display area (61) are adjusted to be turned off, and the N pixels at the position of the correction area (62) on the second side close to the effective display area (61) are adjusted to be turned on, and the turned-off pixels and the turned-on pixels are symmetrically arranged on both sides of the effective display area (61).

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