LED matrix screen parameter calibration system and method

Abstract

The utility model discloses a parameter correction system and method of LED matrix screen, comprising a main controller and a plurality of LED driving units, which is characterized in that the LED driving unit comprises a storage circuit, a storage control circuit and a LED driving circuit, wherein the storage circuit storages the point correction parameter of the LED matrix of the current-level LED driving unit. When the parameter correction system of the LED matrix screen reads the correction parameters, the main controller controls the LED driving unit and a communication channel is established between the main controller and the LED driving unit, the point correction parameters stored in the storage circuit of the LED driving unit are read to the main controller by the main controller and the storage control circuit of respective-level LED driving unit through the communication channel, the main controller finishes the operation and contrast of the point correction parameters, and transfers the actual display values to the LED driving circuit of the LED driving unit.

Description

technical field [0001] The invention relates to a system and method for calibrating parameters of LED dot matrix screens, in particular to a system and method for calibrating parameters of LED dot matrix screens with unitized design. Background technique [0002] With the improvement of LED (light-emitting diode) production process level and the improvement of luminous efficiency, especially the emergence of red, green and blue high-brightness LED devices, the spectrum of LED devices covers the range of natural light, and the use of LEDs to manufacture dot matrix screens has become Become an important field of LED application. [0003] The biggest difficulty encountered in the design of LED dot matrix screen is the consistency problem: on the one hand, due to the deviation of the manufacturing process, the LED dot matrix in the large-size LED screen has different display brightness under the same driving current; on the other hand, On the one hand, due to the differences in...

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Problems solved by technology

[0003] The biggest difficulty encountered in the design of LED dot matrix screen is the consistency problem: on the one hand, due to the deviation of the manufacturing process, the LED dot matrix in the large-size LED screen has different display brightness under the same driving current; on the other hand, On the one hand, due to the differences in the driving circuit components of each part of the LED dot matrix, the deviation of the actual driving current is caused, which leads to uneven brightness of the LED dot matrix screen and affects the display quality of the picture.

The disadvantage of this dot correction method applied to large LED dot matrix screens is that the dot correction parameters written in memory in advance must correspond to the address of each cascaded LED dot matrix block in the system. For cascaded LED dot matrix blocks, all the calibration parameters in the memory must be erased and rewritten, resulting in poor system flexibility; moreover, this system does not have automatic error correction capabilities, and it is easy to appear in the actual large-screen assembly process. The assembly address of a certain LED dot matrix does not correspond to the address of the calibration parameters in the memory, and the system itself cannot find this error, which leads to more serious display defects

The disadvantage of this method is: the microprocessor of the drive unit needs to calculate each display command and point correction parameter of the main controller. In a large LED screen system with a large amount of display data and a high refresh rate, The low-end microprocessor in the drive unit is often in short supply for point correction processing

If high-end microprocessors such as ARM and DSP are used in each drive unit, or programmable logic devices such as FPGA are used to realize point correction calculation processing, for a large LED screen composed of hundreds or even thousands of LED drive units, its cost will become very expensive

In addition, the patent with the publication number CN1427383 mentions that the microprocessor is removed in the LED drive unit, and the point correction parameters and the value to be displayed are directly calculated in the comparison circuit. This correction method is only applicable to single point or a small number of points, A low-speed, very simple LED system, and its calculation speed and point correction quality obviously cannot meet the display requirements of large-size LED screens

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