A kind of led display screen and its display control device and blanking circuit
A technology of blanking circuit and control chip, which is applied to static indicators, instruments, etc., and can solve problems such as incomplete blanking of LED display screens
Active Publication Date: 2019-03-08
SHENZHEN FM ELECTRONICS GRP CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to provide an LED display screen and its display control device and blanking 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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[0022] 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.
[0023] 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 signal will not be generated, and this narrow pulse signal can charge the parasitic capacitance on the channel, so that the parasitic capacitance is high, This in turn leads to ...
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The invention belongs to the technical field of LED display, and provides an LED display screen, a display control device thereof and a blanking circuit. According to the invention, an LED blanking circuit comprising multiple time delay devices, multiple line scanning control chips and multiple blanking signal generation modules is used, so the time delay modules are enabled to carry out partial time delay or complete time delay on input signals of the line scanning control chips, and the line scanning control chips generate multiple line scanning control signals according to the completely delayed input signals, or generate multiple line scanning control signals according to partially delayed input signals and partially undelayed input signals so as to gate corresponding line channels in an LED display array. All the line scanning control signals are free from narrow pulse signals. The blanking signal generation modules generate blanking signals according to the line scanning control signals so as to carry out blanking processing on the line channels corresponding to the blanking signals in the LED display array. Thus, a problem is solved that incomplete blanking is generated by the LED display screen due to a timing problem in the current LED display screen.
Description
technical field [0001] The invention belongs to the technical field of LED display, and in particular relates to an LED display screen, a display control device and a blanking circuit. 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 There...
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IPC IPC(8): G09G3/32
CPCG09G3/32
Inventor 王燕晖张敏
Owner SHENZHEN FM ELECTRONICS GRP CO LTD