Abstract: Provided is a liquid crystal handwriting board. The liquid crystal handwriting board includes: a liquid crystal panel, a photosensitive assembly, and a control assembly; wherein the liquid crystal panel includes a first substrate and a second substrate that are opposite; the photosensitive assembly includes a plurality of photosensitive elements; and the control assembly is electrically connected to the liquid crystal panel and the photosensitive assembly, and is configured to determine position information of a pixel region for erasure by detecting position information of target light irradiated to the liquid crystal panel by the photosensitive assembly and supply a pixel voltage to the plurality of pixel electrodes in the pixel region for erasure, such that a voltage difference is present between the plurality of pixel electrodes in the pixel region for erasure and the common electrode.

Abstract: A liquid crystal display panel is provided. The liquid crystal display panel includes: a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer and a plurality of strip-shaped spacers disposed between the first substrate and the second substrate. In the liquid crystal display panel, there is an overlapping area between an orthographic projection of a first signal line on a target base and an orthographic projection of a second signal line on the target base, and an orthographic projection of the strip-shaped spacer on the target base is not overlapped with the overlapping area.

Abstract: Systems and methods based on firing table fitting allow interception of a small low-altitude low-velocity target. A system includes: a target detecting system, a directing control system, a launch control system, an interception execution system, a communication bus a, a communication bus b and a communication bus c. Firing table data under a standard working condition and fitting parameters under different working conditions are pre-stored in the system. Based on target flight data and environment condition parameters, a lead aiming point is predicted, a time sequence of each stage of a fight flow is controlled, and firing data are output to execute an interception by the launch control system. An interception operation is simplified, a ground control of a non-controlled bomb fight flow is realized, a single shot success probability of an interception system is increased, and an interception cost is reduced.