Research On Key Technology Of LED Display Gray-scale Control

Gray control deponds on the process management and the modulation algorithmof gray level. It is not conducive to the meticulous research because both of whichare often confused. The gray process management, which is a kind of architecture ofgray-scale implementation, is a macro-control. The gray-scale modulation algorithm,which is part of the architecture, offen depends on experience. Usually, the improvedalgorithms are of some randomness and lack of effective evaluation mechanisms.Because of the shortcomings of the full color LED display gray-scale control, twokey technologies of the gray-scale process management and gray-scale modulationalgorithm are researched in this paper. The major contributions of this dissertationare summarized as follows:1. A concept of gray-scale process management and a gray-scale processmanagement model based on the second-level cache and the weights comparison areproposed. The prediction results of key hardware resources, desided by thegray-scale process management model, and the refresh doubling technology canimprove the visual refresh rate. It provides a method for improving LED displayrefresh rate for practical engineering application. A hardware resource estimationstep is given though the study of the gray process management. Through the forecaststep, an equilibrium point between operating speed of L1cache and buffer size of L2cache is given. The visual refresh doubling technology based on this equilibrium point can make the visual refresh rate to improve gbtimes, it will ensure theupgrading of the refresh rate in the case of rational use of hardware resources.2. The paper preferably provided a selection method for gray-scale controlparameter, which is suitable for engineering application. Based on the gray-scalemodulation model, the gray-scale modulation is divided into the basic gray-scalemodulation and the expand gray-scale modulation. The paper provided the methodof selecting a preferred scan clock and the concept of scan clock redundancy. Themaximum scan clock redundancy can be used to judge the control system hardwareperformance. In addition, on this basis, the control parameter optimization approachis summarized, which provided adequate theoretical guidance for the design of theLED display control system.3. The paper provided a time slice matching algorithm, which is used toimprove the stability of the display image, and to reduce flicker. Depending on theoptimization parameters, we can use them to achieve gray-scale modulationalgorithm in order to achieve optimal performance. By the time-slice matchingalgorithm, the time-slice arrangement is evidence-based and the display flicker isreduced by making LED on-off more uniform. Then, an assessment strategy offlicker factor, which is used to judge the results of the time slice gray-scalemodulation, was given in the paper. The strategy will also provide an important basisfor the algorithm updates.