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LED matrix control circuit

A matrix control and circuit technology, applied in the field of LED matrix control circuit, can solve the problems of charging too late to fully discharge, damage to LED components, and easy to cause micro-lighting, etc., to achieve high reliability, reduce the possibility of damage, and reduce micro-lighting. The effect of the electric light phenomenon

Inactive Publication Date: 2017-04-05
RICOH KK
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

If the reverse voltage applied to the cathodes of these LED elements is greater than or equal to the reverse breakdown voltage of these LED elements, there will be a possibility that these LED elements will be damaged
[0006] In addition, in the control of the LED matrix control circuit, the high-speed switching of the row control signal or the column control signal will make it too late for the charge on the LED elements that have been lit to be completely released before the LED elements of the next row are lit, which will easily cause Micro lighting phenomenon

Method used

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Embodiment Construction

[0032] In order to further illustrate the content of the present invention, the present invention will be described in more depth and in detail through the description of specific embodiments below in conjunction with the accompanying drawings.

[0033] Here, it is worth noting that in the following description of the present invention, for convenience of explanation, the left-right direction (X-axis direction) is used as "row", and the up-down direction (Y-axis direction) is used as "column". However, in the present invention, "row" and "column" should be understood as relative rather than absolute. In fact, in the technology disclosed in the present invention, "row" refers to the arrangement direction of LED elements arranged along a certain direction in the LED matrix and the anodes are connected to each other. Correspondingly, the direction perpendicular to this direction is " List".

[0034] figure 2 A block diagram of an LED matrix control circuit according to an embo...

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Abstract

The invention provides an LED matrix control circuit comprising an LED matrix which comprises MxN LED elements which are arranged in a matrix of M rows and N columns; M first control switches which are arranged to be corresponding to each row of the LED matrix in a one-to-one way, wherein each first control switch is connected in series in a common flow path through which power voltage supplies power to the anodes of the corresponding row of LED elements and used for connecting or disconnecting power supply of the power voltage to the anodes of the row of LED elements under the control of the corresponding row of control signals; and MxN second control switches, wherein each LED element is provided with one second control switch, each second control switch is connected in series in a flow path between the cathode of the corresponding LED element and grounding voltage and used for connecting or disconnecting the flow path between the cathode of the corresponding LED element and the grounding voltage under the control of the corresponding column of control signals, and the flow paths between the cathode of the LED element corresponding to the second control switch and the cathodes of other LED elements of the same column of the LED elements are also disconnected when the flow path between the cathode of the LED element and the grounding voltage is disconnected.

Description

technical field [0001] The invention relates to an LED matrix control circuit. Background technique [0002] Due to the excellent characteristics of small size, low power consumption, long working life, and fast response time, LEDs are widely used in LED display equipment, information display devices, and other fields. Moreover, due to the innovation of LED manufacturing technology, while the cost of LEDs has decreased, their reverse breakdown voltage has also shown a downward trend. [0003] For the LED control method, the LED matrix control circuit is a cheap and high-performance LED control method. figure 1 A circuit configuration showing an example of a conventional LED matrix control circuit. figure 1 The shown LED matrix control circuit includes an LED matrix 11 , a row control switch 12 and a column control switch 13 . The LED matrix 11 includes LED elements LED11-LED33 arranged in a matrix of 3 rows and 3 columns (rows in the X-axis direction and columns in the Y-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/30
Inventor 黄煜
Owner RICOH KK