7results about How to "Uniform brightness" patented technology

The application provides a panoramic system brightness adjusting method, which comprises the following steps: acquiring images of each camera; determining overlapping areas of the images of each camera; selecting a first image as a reference image of a panoramic image and a second image as a to-be-stitched image in the overlapping areas; acquiring an initial homography matrix between the reference image and the to-be-stitched image; correcting the initial homography matrix to obtain an optimized homography matrix; stitching the reference image and the to-be-stitched image through a bilinear interpolation algorithm according to the optimized homography matrix to obtain a panoramic stitched image; and judging whether the brightness uniformity of the panoramic stitched image meets a preset value; if yes, the panoramic image stitching is completed; otherwise, the brightness of the panoramic stitched image is adjusted. The application realizes the brightness uniformity of the panoramic stitched image and improves the imaging quality.

According to an embodiment of this utility model, a blood type card reader and a blood type analyzer are disclosed. The blood type card reader includes a base, a cover, a diffuser, a first light source, and an imaging module. The blood type analyzer includes a blood type card reader. The cover and the base together define an installation cavity. The diffuser divides the installation cavity into an imaging area and a light source area on opposite sides. The imaging area allows blood type cards to be inserted. The first light source is located in the light source area and emits light away from the base. The light emitted by the first light source first shines on the inner wall of the cover. After reflection by the cover and harmonization by the diffuser, the light entering the imaging area is more uniform and softer. Because the light is homogenized before entering the imaging area, the light intensity at different locations in the imaging area tends to be consistent. The imaging module uses the diffuser as a background to photograph the blood type card. The photographed image has uniform brightness and is clear, reducing the probability of image distortion and improving the accuracy of blood type identification.

The application discloses a system and method for generating stable interference fringes by using a pure phase reflective liquid crystal spatial light modulator, and the system comprises a light source module, a laser collimation filtering and beam expanding module, a pure phase reflective liquid crystal spatial light modulator (SLM) control module and a CCD image acquisition module. The system can generate stable double-hole light spots by loading a gray-scale gradual phase grating on the SLM, replaces the method for generating double-hole light spots by using a photoetching mask in a traditional physical optical interference experiment, and can achieve the final result without the aid of other devices, and is simple and convenient to operate. In addition, compared with traditional interference systems such as a Talbot-Green system and a Mach-Zehnder system, the output interference fringes will not vibrate, and the calculation of the post-stripe movement amount is not affected, and the system has the characteristics of stable operation, flexible control and accurate calculation.

The application is suitable for the field of optical technology, and provides an optical waveguide assembly and a near-eye display device. The optical waveguide assembly comprises a waveguide substrate, an in-coupling grating, a redirecting grating and an out-coupling grating. The redirecting grating is located between the in-coupling grating and the out-coupling grating along an optical path. The in-coupling grating is used for coupling incident light into the waveguide substrate. The redirecting grating is used for deflecting and expanding the propagation direction of at least part of the incident light from the waveguide substrate, and diffracting at least part of the incident light to obtain first diffracted light. The out-coupling grating is used for coupling the first diffracted light out of the waveguide substrate. The redirecting grating is used for deflecting and expanding the incident light, which can widen the incident light, and disperse the incident light within its width to avoid light concentration, so that the first diffracted light is uniformly bright after being coupled out of the out-coupling grating, and the brightness uniformity of a picture seen by the human eye is improved.

The utility model discloses a kind of liquid crystal display modules, comprising: glue frame;Liquid crystal glass is located in the side of glue frame;Printed circuit board is located in the side of glue frame away from liquid crystal glass, part covers glue frame;The side of printed circuit board towards liquid crystal glass is equipped with LED patch indicator light, the side of glue frame away from printed circuit board is equipped with light guide column, LED patch indicator light is located in light guide column, light guide column is used to the light of LED patch indicator light produces spotlight.This application liquid crystal display module, by glue frame between liquid crystal glass and printed circuit board, the LED patch indicator light of the side of printed circuit board towards liquid crystal glass is embedded light guide column and touch key cap, realized with glue frame the integration of liquid crystal glass and light guide column and key cap, save the artificial of LED patch indicator light, realize assembly simplification, cost reduction and satisfy the implementation of the individualization scheme of customer.It realizes three-dimensional stacking, greatly reduces the plane occupied area and overall thickness of liquid crystal display module, beneficial to equipment light and thin.

Embodiments of the present application provide a method for improving unevenness of light intensity of a stripe, the method comprising: forming a grating stripe on a projection surface by a grating projection camera; taking a plurality of calibration points along a straight line perpendicular to the grating stripe, wherein the number of the calibration points is greater than the number of the grating stripe; obtaining a gray value of each of the calibration points; and adjusting a rotation angular velocity of a galvanometer of the grating projection camera according to the gray value. Embodiments of the present application also provide a structured light depth camera, a laser camera, an electronic device, a computer readable storage medium and a computer program.

This utility model relates to a core-shell structure quantum dot dual-band anti-blue light backlight module in the field of display technology. It includes a substrate with a driving circuit on it. From bottom to top, the substrate is sequentially arranged with a light source layer, an emissive layer, a filter layer, and a diffusion layer. The light source layer is composed of blue quantum dots, and the emissive layer is composed of red quantum dots (CsPbBr3), green quantum dots (CsPbBr3), and transparent polystyrene, with the red and green quantum dots uniformly dispersed in the transparent polystyrene. The filter layer is a perovskite quantum dot core-shell structure layer, constructed using perovskite quantum dot core-shell material (CsPbBr3 / ZnS). The diffusion layer is composed of nanoscale polymer particles and EVA. This utility model provides eye protection, improves image quality, meets the human eye's visual brightness requirements and color synthesis needs, and brings users a display effect that combines health and a high-quality visual experience.