3results about How to "Improve photosensitivity" patented technology

The application provides a kind of photoinitiator, holographic polymer dispersed liquid crystal material and its preparation method and application, the above-mentioned photoinitiator is a single-component photoinitiator, which is excited after absorbing photon and homolysis generates carbon radical with initiation polymerization activity;Compared with the holographic polymer dispersed liquid crystal material of the existing multi-component photoinitiating system, the chemical reaction in the molecule of the photoinitiator in the application cannot be disturbed by additive, which is cracked after being excited, effectively improves the generation efficiency of free radical, and can realize the holographic recording process faster, greatly improves the photosensitive sensitivity of holographic polymer material, effectively simplifies the formula of holographic polymer dispersed liquid crystal material, further reduces the production cost of holographic polymer dispersed liquid crystal material.

This disclosure relates to an image sensor, camera module, and imaging device; the image sensor includes: a pixel array layer including a plurality of sub-pixels arranged in an array, the pixel array layer including a plurality of pixel groups, each pixel group including a first number of sub-pixels, the first number of sub-pixels being used to sense the same color, the first number being greater than 1; a first lens layer disposed on the light-incident side of the pixel array layer, including a plurality of first lenses disposed one-to-one with the plurality of sub-pixels; a second lens layer disposed on the side of the first lens layer away from the pixel array layer, including a plurality of second lenses disposed one-to-one with the plurality of pixel groups; each second lens being used to disperse incident light onto the first number of first lenses corresponding to each second lens; each first lens being used to focus light onto the sub-pixel corresponding to the first lens.

The invention relates to the technical field of materials, in particular to a polyimide precursor and a preparation method thereof, a polyimide precursor glue solution and a preparation method thereof, and a polyimide film. The main chain of the polyimide precursor contains a keto-carbonyl self-sensitizing group and a group containing abstractable reactive hydrogen, and the keto-carbonyl self-sensitizing group and the group can realize photo-crosslinking. Meanwhile, the polyimide precursor also has an ester-type photosensitive branched chain, and a cross-linked structure is easily formed under the action of a photo-crosslinking agent and the like, so that dual sensitization is realized. The polyimide film prepared from the polyimide precursor not only retains the high resolution of ester type photosensitive polyimide, but also reduces the proportion of photosensitive branched chains in the structure, so that the film shrinkage effect after curing is reduced, and the prepared polyimide film has both high resolution and lower film thickness shrinkage rate.