Non-linear pulse-width modulation PWM control device

Abstract

This invention provides one shining or display network semiconductor LED shining system, which uses Network agreement and inside imbedded processor control and adopts non-linear PWM formula and control curve to drive semiconductor LED shining source to respond to linear brightness by visual characteristics to improve the dynamic range by human visibility on semi-conductor LED brightness.

Description

1. Technical field [0001] The present invention relates to a lighting control device for lighting or display purposes, in particular to a lighting device for semiconductor LED network control and driving. 2. Background technology [0002] The known control and driving technologies of LED lighting can be divided into the following categories according to their technical characteristics: [0003] (1) Use a semiconductor LED lighting device that periodically turns on / off the output port at a certain time interval. By selecting different on / off times, it is used to produce light and dark effects of LED lighting luminance. The advantage is that it can reduce the power consumption of driving LEDs, improve the quality of lighting changes, and create lifelike dynamic lighting effects. [0004] The patent documents related to the technical features are: [0005] ① LED drive circuit of Japan Seiko Electronics Co., Ltd. (China Patent Publication No. CN1370035A announced on September ...

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Problems solved by technology

[0010] However, due to the inherent defect of human vision, that is, the linear change of human vision relative to the LED driving current does not present a linear response of vision relative to luminance, but a logarithmic response

This defect of human vision is manifested in: in the low luminance range of the LED, the visual response is basically a linear response; when the luminance reaches about 65% or more of the maximum luminance, the visual response is a compressed response; specifically, In other words, when the luminance of semiconductor LED changes from 0-100%, human vision cannot achieve a full range of linear perception; changes, thus causing a dynamic compression of the visual response

The currently known LED driving methods do not take into account the special defect of human vision, which leads to a great difference between the actual effect of the visual response and the theoretical effect.

[0011] In addition, the network control system of semiconductor lighting usually adopts the international DMX-512 control protocol. Since the effective control distance of the network is only 250 meters; it is a one-way transmission characteristic, and it cannot provide a return path for node information; and No Network Arbitration Agreement

Therefore, from the remote network application of semiconductor lighting, it is inevitable to leave a big regret

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