Ghost image elimination circuit of led scanning screen and led scanning screen
A technology for eliminating circuits and LED arrays, applied in static indicators, instruments, etc., can solve the problems of LED screen strikes and highlights, and achieve the effect of eliminating ghost images, high reliability and low power consumption
Active Publication Date: 2018-09-14
CRM ICBG (WUXI) CO LTD
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Problems solved by technology
If there is a lamp breakdown in the row, such as D12, it means that the current on other lamps (such as D22~Dn2) in the row will pass through the breakdown lamp D12 and resistor R1 to form a path to the ground, then this The current of the column lights is not controlled by the constant current driver IC, causing the entire column to be bright
In the case that the quality of LED lights cannot be guaranteed, this will be a fatal blow to the LED screen
Method used
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Embodiment Construction
[0018] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.
[0019] There is a phenomenon of ghosting in the LED scanning screen. If the method of resistive grounding is used to eliminate the ghosting, the phenomenon of "caterpillar" will occur again. However, the present invention designs a ghost elimination circuit for an LED scanning screen, which can eliminate the ghost phenomenon without causing the "caterpillar" phenomenon. The circuit consists of three parts: an enabling control module, a driving control module and a discharge module. The structure is simple, the power consumption is low, the reliability is high, the cost is low, and the driving ability is strong, which can eliminate the ghost image when the LED screen scans, and improve the display effect of the LED screen.
[0020] see figure 2 Shown is a schematic structural diagram of the ghost eliminati...
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The invention relates to a ghosting elimination circuit of an LED scanning screen. According to the circuit, the output end of an enabling input module is connected with the input end of a driving control module; the first output end of the driving control module is connected with the input end of a discharging module; the second output end of the driving control module is connected with the output end of the discharging module, so that the output end of the circuit can be formed; the output end of the circuit is connected with the LED scanning screen; and the driving control module is also connected with an external power source. The invention also relates to an LED scanning screen. The LED scanning screen comprises a plurality of ghosting elimination circuits, a row driving control bus, a column driving control bus and an LED array. With the ghosting elimination circuit of the LED scanning screen and the LED scanning screen of the invention adopted, ghosting phenomena can be eliminated, and caterpillar phenomena can be avoided. The ghosting elimination circuit has the advantages of simple structure, low power consumption, high reliability, low cost, strong driving capacity and wide application range, and can improve the display effect of the LED screen.
Description
technical field [0001] The present invention relates to the field, in particular, and specifically refers to a ghost elimination circuit of an LED scanning screen and an LED scanning screen. Background technique [0002] LED screens have high brightness, far exceeding LCD screens, so they are widely used as outdoor display screens, such as outdoor advertising screens. In order to reduce system costs, reduce the number of driver chips, meet the needs of high-density screens, and reduce the number of components, manufacturers use dynamic scanning on LED scanning screens. However, when using dynamic scanning, it also brings some problems to the display screen, including the appearance of ghost images. The system drives the scan lines separately at different times. When the next row is driven, the dark and bright phenomenon of the previous row is called "ghosting". The reason is: there is a parasitic capacitance on the row line. When the previous row line is turned off, the r...
Claims
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IPC IPC(8): G09G3/32
Inventor 陈冠峰孔祥艺王效刘卫中
Owner CRM ICBG (WUXI) CO LTD