led display control system

Abstract

The invention provides an LED display screen control system. A scanning card (40) comprises a data input / output circuit (43) and an image display control chip (20) which are connected with each other, wherein the image display control chip (20) is preferably an ASIC chip, is used for receiving parameter data and image data through the data input / output circuit (43), carrying out capture, correction, rearrangement and gray level extraction on the received image data according to the parameter data, so that drive signal groups and display data groups are generated and converted into serial differential signal groups which are output to an LED lamp panel module (50); the LED lamp panel module (50) comprises a serial-to-parallel chip group (51) and a drive chip group (53) which are connected, and the serial-to-parallel chip group (51) is used for receiving the serial differential signal groups and carrying out series / parallel conversion so that parallel TTL format drive signal groups and display data groups are generated and sent to the drive chip group (53) for image display drive. According to the LED display screen control system, the function of the scanning card is made chip-based to the greatest extent, and therefore, the purposes of reducing the size of the scanning card and the improving the display effect of an LED display screen body are achieved.

Description

Technical field [0001] The invention relates to the field of display technology, in particular to an LED display screen control system. Background technique [0002] The existing LED display control system mainly includes a sending card, a scanning card, and an LED display. The scanning card is configured in each LED cabinet, and multiple LED cabinets are spliced ​​into one LED display. The display effect of the LED display is directly determined by the scanning card (or LED display control board, receiving card) configured in each LED box. When the LED cabinet specifications are determined, the performance parameters of the LED display are basically determined, especially in the general-purpose driver chip LED display. [0003] With the development of small spacing, the number of pixels that need to be loaded by the scanning card increases, and the limited bandwidth of the scanning card makes it impossible to display the image perfectly under a large load; the limitation of the s...

AI Technical Summary

Problems solved by technology

[0006] However, the FPGA and its supporting related devices in the existing scanning card are relatively large in size, and the HUB board (transfer board) is required to be provided by the screen manufacturer, which increases the thickness of the product and is not conducive to the design of high-density LED display screens.

The limited bandwidth of the scanning card cannot support a large load

Due to its low price, the general-purpose driver chip is still favored by customers even though it has been used for a long time; for the LED box using the general-purpose driver chip, due to its driving characteristics, it is necessary to output grayscale data continuously. However, The RGB data set (display data) output by the FPGA is limited, which cannot meet the occasions where the display effect is relatively high.

In addition, the scanning card and the LED light board module in the LED box are connected by cables. The existing signal transmission and connection methods have the following problems: 1) Each single-ended signal needs to occupy a wire core, resulting in The number of wire cores in the cable is large. Taking a conventional 8-scan LED light board module as an example, if two sets of RGB data are required, plus the clock signal (CLK), latch signal (LAT), and enable signal (OE) , Row selection signal (A, B, C) and other signals have a total of 12 single-ended signals, plus at least one ground signal, at least 13-core cable is required. However, there are often some applications in the LED display industry. The module has a limit on the number of wire cores connected to the cable, and multi-core cable is inconvenient; 2) Due to the large number of cable cores, there are many contact points between the cable and the connector of the LED light board module , A single wire core failure or poor contact will lead to abnormal display. The faults caused by this reason account for a large proportion of LED display application faults; 3) TTL signals have limited transmission distance due to signal attenuation, usually no more than 2 meters, some The application requires a longer transmission distance, so TTL signals are not competent; and 4) the transmission of TTL signals by cables leads to greater signal radiation, which makes it difficult for LED displays to pass EMC tests

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