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A light emitting device capable of dynamically regulating output voltage and related control method

A technology of output voltage and light emitting device, applied in the field of light emitting device

Inactive Publication Date: 2012-06-13
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it will take too much operating time and the comparison device to obtain the minimum value of the voltage value

Method used

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  • A light emitting device capable of dynamically regulating output voltage and related control method
  • A light emitting device capable of dynamically regulating output voltage and related control method
  • A light emitting device capable of dynamically regulating output voltage and related control method

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Embodiment Construction

[0048] Please refer to image 3 , image 3 It is a schematic diagram of a light emitting device 30 that can dynamically adjust the output voltage according to an embodiment of the present invention. The light emitting device 30 includes a string of light emitting diodes C 1 ~C m , a voltage converter 302 , a current driving unit 304 and a loop control unit 306 . Wherein, the light emitting device 30 can be applied to any kind of light source. In this embodiment, the light emitting device 30 includes a string of light emitting diodes C 1 ~C m , but not limited thereto, there may be only one LED string. On the other hand, since the LED is a current-driven element, its luminous brightness is directly proportional to the magnitude of the driving current, that is, the greater the driving current, the greater the luminous brightness of the LED. Generally speaking, in order to achieve the same brightness requirement by requiring the same current flowing through each LED, there...

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Abstract

The present invention discloses a light emitting device capable of dynamically regulating output voltage and related control method. The light emitting device includes a plurality of light emitting diode chains, a voltage converter, a current driving unit, and a loop control unit. The loop control unit is coupled to the plurality of light emitting diode chains and the voltage converter, and includes a voltage selection unit, an error amplifier, and a conversion controller. The voltage selection unit is utilized for generating a plurality of candidate feedback voltages according to a thresholdvoltage and a plurality of headroom voltages, and selects a feedback voltage to be provided to a loop control unit for controlling voltage conversion of the voltage converter.

Description

technical field [0001] The present invention relates to a light emitting device and its related method, in particular to a light emitting device and its related method for dynamically adjusting the output voltage through an optimal voltage selection device. Background technique [0002] Compared with traditionally used light sources, Light Emitting Diodes (LEDs) have the advantages of power saving, long component life, no mercury, rich color gamut, no warm-up time, and fast response. It is widely used as a light source for display and lighting. For example, a backlight module of a conventional liquid crystal display panel uses a cold cathode fluorescent lamp (CCFL) as a light source. Nowadays, as the luminous efficiency of light-emitting diodes continues to increase and the cost decreases, light-emitting diodes tend to gradually replace CCFLs as light sources for backlight modules. [0003] Due to the non-ideal factors in the manufacturing process or the influence of mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/00F21S2/00F21V23/00H05B37/02F21Y101/02
Inventor 徐国庆张淙豪许庆勋廖廷伟
Owner NOVATEK MICROELECTRONICS CORP