Methods and device for LCD photocuring 3D printing light equalizing optimization compensation

Abstract

The invention mainly provides six methods and a device for LCD photocuring 3D printing light equalizing optimization compensation. The device comprises a control unit, an image shooting unit, an LCD screen, a light source and a semi-transparent unit. The semi-transparent unit covers the backlight surface of the LCD screen. Irradiating light emitted by the light source penetrates through an LCD screen transparent block matrix image to irradiate the semi-transparent unit and form a semi-transparent light spot matrix state image on the backlight surface of the LCD screen. The control unit shoots the light spot matrix state image through the image shooting unit to obtain an initial gray value and a gray compensation difference value of each calibration pixel coordinate point. Each calibration optimization gray value is obtained, and a full-screen optimization gray value is obtained through image scaling and an interpolation compensation algorithm to conduct photocuring printing; or, the gray compensation difference values are subjected to image scaling, interpolation values of all pixel gray difference values of the full screen are obtained through the interpolation compensation algorithm, then a full-screen gray value of a mask is subtracted from the interpolation values of all the gray difference values, a full-screen optimized gray value is obtained, and photocuring printing is conducted.

Description

technical field [0001] This application relates to the technical field of 3D printing, in particular to a method and device for uniform light optimization and compensation of LCD photocuring 3D printing. Background technique [0002] At present, light-curing 3D printers usually use a single light source or a matrix light source. Due to the service life of the lamp bead itself, manufacturing errors, manufacturing precision limitations of optical devices, and the energy loss of the LCD path, the energy value of the irradiated light at each point on the plane when the ultraviolet light source penetrates the mask pixel to irradiate the photosensitive curing reaction material Inconsistency, uneven exposure; under normal circumstances, the energy value of each point on the plane where the photosensitive curing reaction material is cured will have high energy in the middle position and low energy around it, or the energy value of each point on the plane is different, and the photos...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned defects or deficiencies in the background technology, the present invention provides six uniform light optimization compensation methods for LCD photocuring 3D printing uniform light optimization compensation methods and a uniform light optimization compensation device adopted therefor. Among the six methods The three methods use the gray value of the calibrated light spot to obtain the gray compensation difference, and then obtain the calibration optimized gray value of each calibrated pixel coordinate point, and then use the image scaling and interpolation compensation algorithm to obtain the full screen. The full-screen optimized gray value of the pixel is used to perform photocuring uniform light printing; the other three methods in the six methods use the gray value of the calibrated light spot to obtain the gray compensation difference, and then the gray compensation difference is image-scaled And use the interpolation compensation algorithm to obtain the interpolation value of the gray value difference of all pixels in the full screen, and then subtract the interpolation value of each gray value difference from the mask full screen gray value of all pixels in each gray mask slice image to obtain All pixels in the full screen optimize the gray value of the full screen to perform photocuring and uniform light printing; it is beneficial to collect and detect the gray value of fewer pixels in a large number of pixels, so as to achieve more and less; it is also conducive to the gray value of fewer pixels The interpolation compensation obtains the gray level compensation difference of a large number of pixels, so as to make up for more with less, which can save a lot of collection and testing workload outside the program calculation link; it can also solve the problem of uneven exposure in photo-curing 3D printing in the existing technology, It can also solve the problem that the intensity of the light source is not enough to be adjusted, and the bad pixels of the LCD screen affect the uniformity of light and the success of printing;

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