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Luminous dipolar body panel driving circuit having electric current compensation function

A panel drive circuit and light-emitting diode technology, which can be used in cathode ray tube indicators, instruments, static indicators, etc., can solve problems such as unstable brightness and reduced brightness

Inactive Publication Date: 2006-03-29
PRINCETON TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are multiple LEDs passing current in a vertical row, when these currents flow through the resistors R1, R2 or R3 together, multiple voltage drops will be generated on the resistors [H3] R1, R2 or R3, so more or less extrusion The voltage drop on the LED and the current source, as a result, the current decreases and the brightness of the LED decreases, so the brightness of the LED is unstable
This is the shortcoming of the current general LED display panel drive circuit

Method used

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  • Luminous dipolar body panel driving circuit having electric current compensation function
  • Luminous dipolar body panel driving circuit having electric current compensation function

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Embodiment Construction

[0008] The embodiment of the present invention is shown in Fig. 2, and the right side of Fig. 2 is Figure 1 Shown circuit, Fig. 2 left side is the new design that the present invention adds. A copy of the invention Figure 1 The shown constant current source ISEG is sent to the circuit of eight columns of LEDs respectively through switches SEG1, SEG2...SEG8, but the label is changed to constant current source IC and sent to an adding circuit 22 through switches COMP1, COMP2...COMP8 respectively.

[0009] Control the switches SEG1, SEG2...SEG8 and send the constant current source ISEG to the eight columns of LED circuits respectively. It is the switch control circuit 21 in the upper left corner. Its input is the external control command, and its output is eight lines to respectively control the switches SEGG1, SEGG2... ...seg8 on and off. The present invention simultaneously connects the eight lines of the switch control circuit 21 to the switches COMP1, COMP2...COMP8 to contr...

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PUM

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Abstract

The invention provides a LED panel driving circuit with current compensating function. Because the LEDs of the LED panel are arranged in a matrix form and the LED panel and switches all have line resistances, if plural LEDs on the same line are lighted at the same time, the current source produces multiple voltage drop as flowing through the same line resistance, thus reducing the voltage drop on the LEDs and current source to cause the reduction of LED current and brightness, and thus the LED brightness is not stable. The invention duplicates a set of LED current source circuit, individually compensating the reduction of LED current, thus keeping the LED brightness constant.

Description

technical field [0001] The present invention relates to the improvement of a light emitting diode (LED, Light Emitting Diode) panel drive circuit, especially a circuit that compensates for the reduction of the LED current and keeps the brightness of the LED unchanged. Background technique [0002] The driving circuit of general LED display panel is as follows: Figure 1 As shown, to simplify the diagram, Figure 1 Only an 8x3 LED matrix is ​​shown. The constant current source ISEG is sent to the eight columns of LEDs respectively through the switches SEG1, SEG2...SEG8, and the eight columns of LEDs form three rows vertically, and are respectively connected to resistors R1, R2, R3 (this is an online resistor, not a physical resistor) and the switch COM1 , COM2, COM3 and ground. [0003] When the switch COM1 forms a path with SEG1 and SEG3, and other switches form an open circuit, only LED11 and LED31 are illuminated by current, and other LEDs are extinguished. And so on. ...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/14G09G5/10G09G3/3208
Inventor 陈彦文
Owner PRINCETON TECHNOLOGY
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