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LED light emitting driving circuit

A light-emitting drive and circuit technology, applied in the semiconductor field, can solve problems such as large current deviation and uneven brightness of LEDs in LED matrix light panels, and achieve the effect of improving brightness consistency

Pending Publication Date: 2017-10-20
SUZHOU RUIGUANG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current driving method of the LED array has the following defects. Multiple branches are controlled through one output port. Large, which eventually leads to uneven brightness of the LEDs in the LED matrix light panel

Method used

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Examples

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Effect test

no. 1 example

[0015] This embodiment provides a technical solution of an LED light-emitting driving circuit. In this technical solution, the bipolar junction transistor (Bipolar junction transistor, BJT) used for brightness control is an NPN type BJT, and the collector of the BJT is connected to the end of the last LED connected in series on the branch. The cathode is connected, the emitter of the BJT is connected to the current limiting resistor connected in series on the branch, and the other end of the current limiting resistor is grounded.

[0016] figure 2 A schematic circuit diagram of this embodiment is shown. see figure 2 , The LED light-emitting drive circuit consists of several branches connected in parallel. Several LEDs for light display, BJT T21-T25 for brightness control, and current limiting resistors R21-R25 for current limiting are connected in series on each branch.

[0017] exist figure 1 In the LED light-emitting driving circuit shown, whether the LEDs connected i...

no. 2 example

[0023] This embodiment provides another technical solution of the LED light-emitting driving circuit. In this technical solution, the BJT used for brightness control is also an NPN type BJT, and the collector of the BJT is connected to the current limiting resistor connected in series on the branch, and the emitter of the BJT is grounded.

[0024] see figure 2 , the difference between this embodiment and the first embodiment of the present invention is that the series sequence of different elements on each branch will change. In the first embodiment of the present invention, the series sequence of components on each branch is: LED, BJT T21-T25, and current limiting resistors R21-R25. In this embodiment, the series sequence of components on each branch becomes: LED, current limiting resistors R31-R35, and BJT T31-T35.

[0025] The same thing as the first embodiment of the present invention lies in that the type of each BJT remains unchanged, and is still an NPN type BJT. In...

no. 3 example

[0029] This embodiment provides another technical solution of the LED light-emitting driving circuit. In this technical solution, the type of BJT used for brightness control is no longer NPN type, but changed to PNP type. At the same time, the emitter of the BJT is connected to the current limiting resistor, the collector of the BJT is connected to the anode of the first LED in the LEDs connected in series on the branch, and the other end of the current limiting resistor is connected to the The drive voltage input end of the branch circuit is connected.

[0030] see image 3 The difference between this embodiment and the first embodiment of the present invention is that the type of BJT is changed from NPN type to PNP type. At the same time, the series sequence of different components on each branch has also changed. In the first embodiment of the present invention, the connection sequence of components on each branch is: LED, BJT T21-T25, and current limiting resistors R21-...

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Abstract

The embodiment of the invention provides an LED light emitting driving circuit used for driving an LED light emitting array. The LED light emitting array is formed by the parallel connection of multiple branches. Multiple LEDs are connected in series in each of the branches. A bipolar junction transistor (BJT) for brightness control is connected in series in each of the branches. The collector and emitter of the BJT are connected in series in the branches. The base electrode of the BJT is used for inputting a driving signal. According to the LED light emitting driving circuit provided by the embodiment of the invention, the brightness consistency of an LED display array can be improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of semiconductors, and in particular, to an LED lighting driving circuit. Background technique [0002] figure 1 An LED array of an existing LED display is shown. see figure 1 , The LED array is composed of different branches connected in parallel with each other. On each branch, different LEDs are serially connected in series. The drive voltage shown is input from the anode of the first LED of each branch. When the driving voltage is high level, the LED on the corresponding branch is lit. [0003] The current driving method of the LED array has the following defects. Multiple branches are controlled through one output port. Large, which eventually leads to uneven brightness of the LEDs in the LED matrix light panel. Contents of the invention [0004] In view of the above technical problems, an embodiment of the present invention provides an LED lighting driving circuit to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 杨崇民龚坚康
Owner SUZHOU RUIGUANG ELECTRONICS
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