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LED dimming method and device

A technology of dimming device and LED light source, applied in static indicators, instruments, etc., can solve problems such as stroboscopic, improve the effect, overcome the stroboscopic problem, and realize the effect of low cost

Active Publication Date: 2019-07-09
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, if the PWM frequency is fixed, when the brightness is high, the human eye is not sensitive to the impact of flicker; however, when the brightness is low, the problem of stroboscopic flicker will be clearly felt

Method used

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  • LED dimming method and device
  • LED dimming method and device

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] figure 1 It is a schematic diagram of the working environment of the scheme of the present invention in an embodiment; as figure 1 As shown, for LED-based products, such as liquid crystal displays or other products based on LED light sources, the product includes at least two groups of LED light sources, and each group of LED light sources includes at least two LED lamp beads connected in series. The light source adjustment of the product is realized by adjusting the current of the LED lamp bead.

[0020] combine figure 1 In addition to the above description of the schematic diagram of th...

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Abstract

The present invention relates to a LED light modulation method and device. The method is used for at least two groups of LED light sources, and comprises: input pulse current to the first group of the LED light source; inputting constant current to the second group of the LED light source; obtaining light source information obtained by mixing the first group of the LED light source and the second group of the LED light source, and regulating the width of the pulse current and / or the size of the constant current according to the light source information. The LED light modulation method and device overcome the stroboscopic problem of traditional PWM light modulation so as to improve the effect of the LED output light source.

Description

technical field [0001] The present invention relates to the field of LED (light emitting diode, light emitting diode), in particular to an LED dimming method and device. Background technique [0002] Since the liquid crystal molecules themselves do not have the ability to emit light, it is necessary to give him a backlight to display the picture arranged by the liquid crystal molecules. At present, almost all liquid crystal displays in China use LED backlight, that is, light-emitting diodes are used as the backlight source. [0003] The backlight dimming methods of liquid crystal displays are divided into PWM (pulse width modulation) dimming and non-PWM dimming. Since PWM dimming is easy to implement and low in production cost, it is widely used. The basic principle of PWM dimming is to periodically turn on and off the LED to change the conduction time of the forward current, because the brightness perceived by the human eye is a cumulative process, that is, the greater the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34
CPCG09G3/3406
Inventor 邓荣杰
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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