Visual persistence image display device and scan method of same

Abstract

The invention relates to a visual persistence image display device and a scan method of the same. The method comprises the following steps: providing a plurality of first LEDs and a plurality of second LEDs, wherein the first LEDs and the second LEDs are arranged in a row in a staggered mode; providing each preset time used for driving the first LEDs to brighten; and providing variable quantity of the voltage at one end of the second LEDs to the time which decides image data of the position of the second LEDs. The scanning speed of the scan method is higher than that of the prior method. A multiplexer is not need to select the LEDs in the design of a circuit, so the design of the system can be simplified; in addition, the parallel output is adopted, so a drive circuit is not needed to increase the brightness, and the cost is saved.

Description

technical field [0001] The present invention relates to a technology related to light emitting diodes, and in particular to a persistent visual image display device and its scanning method. Background technique [0002] In recent years, due to the advancement of technology, many consumer electronic products have been launched one after another. Earlier, someone utilized the principle of persistence of vision to design a light emitting diode (Light Emitted Diode, LED) flash bar (Light Bar). figure 1 is a structural diagram of a known light-emitting diode flashing stick. Please refer to figure 1 , this circuit includes 16 LEDs D01-D16 and a handle 10. figure 2 is a schematic diagram of the internal memory of a known LED flash stick. Please refer to figure 2 Generally speaking, there is a memory inside this kind of LED flash stick to store the image to be displayed. In this memory, each row represents the light-emitting information of the first light-emitting diode D01 ...

AI Technical Summary

Problems solved by technology

[0005] However, in this method, when scanning each row, it needs to be divided into multiple time segments according to the order of the light emitting diodes D01-D16, and each corresponding time segment is selected by multiplexers 41 and 42 respectively. LED to sense the voltage at node 45

Therefore, when the above-mentioned LED flash bar is scanning and the LED flash bar moves faster, it is easy to fail to sense

Moreover, the above-mentioned technology uses two sets of multiplexers 41 and 42, two sets of LED drive circuits, and two sets of light detection circuits. To achieve fast scanning, a relatively fast microprocessor is required to execute the sequential scanning program.

In addition, when displaying, light-emitting diodes D01-D16 need to be lit up in sequence. In order to maintain the brightness of lighting, the current required for displaying will be relatively large.

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