Non-linear pulse-width modulation PWM control device

A pulse width modulation and control device technology, which is applied in lighting devices, electric lamp circuit layout, use of semiconductor lamps, etc., can solve the problems of dynamic compression of visual response, lack of network arbitration protocol, and inability to achieve human vision. Expanding the dynamic range and enhancing the intuitive feel

Inactive Publication Date: 2006-05-10
上海国皓电子有限公司
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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 o

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[0028] See figure 1 :Indicating the visual defects of the current semiconductor LED lighting current relative to the human visual response. Among them, the horizontal axis represents the linear current change of driving the semiconductor LED, and the vertical axis represents the brightness change of the semiconductor LED with the change of the driving current. It can be seen that the LED brightness response L1 is a linear response with the linear change of the driving LED current, and the human eye The visual response f1 changes to the linear current of the semiconductor LED, but it presents a non-linear change characteristic of the logarithmic response; this is the visual defect caused by the human eye.

[0029] See figure 2 , figure 2 This is the principle block diagram of the present invention. The present invention consists of Interface unit 10, LED photo Ming unit 30 and will Interface unit 10, LED lighting unit 30 is connected to the control line 200 and the control...

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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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Application Information

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IPC IPC(8): H05B44/00G06F17/00G06F19/00H05B37/02
CPCY02B20/30
Inventor 申鸣王家鼎
Owner 上海国皓电子有限公司
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