Adaptively eliminate led ghost and coupling method and circuit

Abstract

The embodiment of the present application provides an adaptive LED ghost elimination and coupling method and circuit, the method includes: controlling the discharge speed of the row parasitic capacitance through the ghost elimination circuit, and increasing the drop of the row selection signal according to the discharge speed of the row parasitic capacitance Along the slope, so that the parasitic capacitance of this row cannot drive the LED on the unselected row, thereby eliminating the ghost phenomenon in the LED; the charging speed of the column parasitic capacitance is controlled by the coupling elimination circuit, and the charging speed of the column parasitic capacitance is reduced according to the charging speed of the column parasitic capacitance. The slope of the rising edge of the column selection signal is such that the column parasitic capacitance cannot drive the LEDs on the unselected columns, thereby eliminating the coupling phenomenon in the LEDs, and thus significantly improving the display effect as a whole.

Description

technical field [0001] The present application relates to the technical field of LEDs, in particular to a method and circuit for adaptively eliminating LED ghost images and coupling. Background technique [0002] A current light emitting diode (Light Emitting Diode, LED) display array is composed of m rows and n columns of LEDs, and the display array is usually scanned by a dynamic scanning method for display. As the integration level becomes higher and higher, more and more pixels are displayed in each row and column, resulting in larger parasitic capacitance on both the row and column lines. When it is on and off, the charge on the parasitic capacitor will flow through the LED that has been turned off, causing the LED to turn on slightly, forming the ghost phenomenon of the LED. At the same time, when the high-contrast brightness display is displayed on the control display, because the voltage at both ends of the LED on the bright side is relatively high, it is coupled to...

AI Technical Summary

Problems solved by technology

As the integration level becomes higher and higher, more and more pixels are displayed in each row and column, resulting in larger parasitic capacitance on both the row and column lines. When on and off, the charge on the parasitic capacitor will flow through the LED that has been turned off, causing the LED to turn on slightly, forming the ghost phenomenon of the LED

At the same time, when the high-contrast brightness display is displayed on the control display, because the voltage at both ends of the LED on the bright side is relatively high, it is coupled to the dark side, making the column voltage on the dark side even higher, resulting in a coupling phenomenon

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