A kind of led display screen and its display control circuit
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A display control and circuit technology, applied to static indicators, instruments, etc., can solve the problem of incomplete blanking of LED display screens, and achieve the effect of solving incomplete blanking
Active Publication Date: 2019-03-08
SHENZHEN FM ELECTRONICS GRP CO LTD
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[0005] The purpose of the present invention is to provide an LED display screen and its display control circuit, aiming at the problem of incomplete blanking of the LED display screen due to timing problems in the existing LED display screen
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] Usually, the main reason for the incomplete blanking of the LED display screen due to timing problems is that the chip select signal of the line scan control chip lags behind the line scan control signal output by the line scan control chip, which makes the line scan control signal appear. Narrow pulse signal, if the width of the narrow pulse signal is smaller than the pulse width of the blanking signal, the blanking effect will not occur, and this narrow pulse signal can charge the parasitic capacitance on the channel, so that the parasitic capacitance is high, This will lead to the afterim...
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Abstract
The invention belongs to the technical field of LED display and provides an LED display screen and a display control circuit of the LED display screen. In the LED display screen and the display control circuit of the LED display screen, an LED display control circuit comprising multiple line scanning control chips, multiple column scanning control chips, an LED display array, multiple pulse eliminating modules and multiple blanking signal generating modules is adopted, so that the pulse eliminating modules eliminate narrow pulses in line scanning control signals, and the blanking signal generating modules conduct blanking treatment on line channels in the LED display array according to generated blanking signals. Thus, the LED display control circuit can eliminate the narrow pulse signals caused by the timing problem and included in the line scanning control signals output by the line scanning control chips and can also conduct blanking treatment on the LED display array, the selected line channel in the LED display array cannot generate the ghost phenomenon, and the problem that the timing problem exists on an existing LED display screen, and consequently blanking of the LED display screen is not complete is solved.
Description
technical field [0001] The invention belongs to the technical field of LED display, in particular to an LED display screen and a display control circuit thereof. Background technique [0002] Due to the advantages of high brightness, low working voltage, low power consumption, large size, long life, impact resistance and stable performance, LED displays are widely used, such as in stadiums, commercial applications, banks, securities , postal service, wharf, shopping mall, station, postal service, telecommunications, office, surveillance, school, restaurant, hotel, entertainment, and other advertising in different outdoor venues, etc. [0003] Generally speaking, the LED display screen is controlled by multiple 8-way row scanning control chips and multiple 16-column channel constant current control chips, and because the parasitic capacitance on the channel cannot be ignored, it is easy to cause the afterimage phenomenon of the LED display screen Therefore, a blanking functi...
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