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Signal generating method and circuit for controlling light-emitting diode brightness

A signal generating circuit and light-emitting diode technology, applied in electroluminescence light source, electric lamp circuit arrangement, light source and other directions, can solve the problems of low display frequency, long pulse width modulation signal length, etc., and achieve the effect of shortening the length

Active Publication Date: 2019-06-07
SILICON TOUCH TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will make the length T of the PWM signal quite long, and it will take more time to display a frame, for example, the display frequency of the frame will be low

Method used

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  • Signal generating method and circuit for controlling light-emitting diode brightness
  • Signal generating method and circuit for controlling light-emitting diode brightness
  • Signal generating method and circuit for controlling light-emitting diode brightness

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Experimental program
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Embodiment Construction

[0014] [Example of Signal Generation Method for Controlling Light Emitting Diode Brightness]

[0015] Please refer to figure 2 , figure 2 It is a flow chart of a signal generation method for controlling the brightness of a light emitting diode provided by an embodiment of the present invention. First, in step S110, a first pulse signal is generated, the first pulse signal includes P bits of gray scale information, P is a positive integer, wherein the resolution of the first pulse signal is N Hz, and N is a positive integer.

[0016] Then, in step S120, a second pulse signal is generated after the first pulse signal, the second pulse signal includes Q bits of gray scale information, and Q is a positive integer, wherein the amplitude of the second pulse signal is the same as the amplitude of the first pulse signal Are not the same. Moreover, in practical application, the resolution of the second pulse signal is the same as that of the first pulse signal.

[0017] Next, in ...

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PUM

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Abstract

The invention provides a signal generation method and circuit for controlling the brightness of a light emitting diode. A signal generation method for controlling the brightness of a light-emitting diode, comprising the following steps. First, a first pulse signal is generated, the first pulse signal includes P bits of gray scale information, P is a positive integer, wherein the resolution of the first pulse signal is N Hz, and N is a positive integer. Then, a second pulse signal is generated after the first pulse signal, the second pulse signal includes gray scale information of Q bits, Q is a positive integer, wherein the amplitude of the second pulse signal is different from that of the first pulse signal, and the second The resolution of the pulse signal is the same as that of the first pulse signal. Next, the grayscale information of the LED is represented by the first pulse signal and the second pulse signal.

Description

technical field [0001] The invention relates to a light-emitting diode, and in particular to a signal generation method and circuit for controlling the brightness of the light-emitting diode. Background technique [0002] A conventional way to control the brightness adjustment of LEDs is to generate a pulse width modulation (PWM) signal to switch a transistor connected to the LEDs. Pulse width modulated signals such as Figure 1A Shown, where the pulse width (responsibility period) D is determined by the control bit. Based on the cost, the frequency of the PWM signal is not high, so that the more control bits are used, the longer the length T of the PWM signal is. For the case of controlling the light-emitting diode display with 16 control bits, the resolution of the pulse signal is N Hz, and N is a positive integer. The pulse width changes with a length of 1 / N, so that 65536 gray scales can be generated within the maximum value Dmax of the pulse width D (that is, the leng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/10Y02B20/30
Inventor 金际远陈奎君
Owner SILICON TOUCH TECH INC