Light source driver and driving method thereof
A light source driving and driver technology, which is applied in the field of light source drivers and their driving, can solve the problems of different driving voltages and the general limitations of the drivers of light emitting diodes, and achieve the effect of increasing the generality.
Inactive Publication Date: 2015-05-20
CORETRONIC (SUZHOU) CO LTD
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[0004] However, according to the size of the electronic device used, the size of the liquid crystal display panel will also change accordingly, so the number of LEDs configured in the LED backlight module will also change accordingly, so that the required driving voltage will naturally be different
Generally speaking, the driving voltage provided by the driver of the light emitting diode will be aimed at a specific voltage, so the driver of the light emitting diode cannot provide the corresponding driving voltage corresponding to the large change in the number of light emitting diodes, so that the universality of the driver of the light emitting diode Is limited
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[0025] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed descriptions of multiple embodiments with accompanying drawings. The directional terms mentioned in the following embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate, not to limit, the invention.
[0026] figure 1 It is a system diagram of a light source driver according to an embodiment of the present invention. Referring to the figure, in this embodiment, the light source driver 100 includes a first boost circuit 110 , a second boost circuit 120 , a voltage control circuit 140 and a voltage feedback circuit 150 . The first boost circuit 110 is used for receiving the input voltage Vin, amplifying the input voltage Vin and outputting the driving reference voltage VDR. The second boost c...
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Disclosed are a light source driver and a driving method thereof. The light source driver comprises a first boosting circuit, a second boosting circuit, a voltage feedback circuit and a voltage control circuit. The first boosting circuit is used for receiving input voltage and outputting driving reference voltage after boosting the input voltage. The second boosting circuit is coupled to the first boosting circuit and used for boosting the driving reference voltage and then outputting light source driving voltage to anodes of light emitting diode series. The voltage feedback circuit is coupled with cathodes of the light emitting diode series so as to receive light source cathode feedback voltage and is coupled with the second boosting circuit so as to output light source cathode feedback voltage to the second boosting circuit. The voltage control circuit is coupled to the second boosting circuit and provides gain control signals according to light source driving voltage so as to adjust boosting times of the first boosting circuit.
Description
technical field [0001] The present invention relates to a light source driver and its driving method, and in particular to a light source driver and its driving method for LED series. Background technique [0002] In recent years, with the vigorous development of semiconductor technology, portable electronic products and flat panel display products are also emerging. Among many types of flat panel displays, Liquid Crystal Display (LCD) has become the mainstream of display products due to its advantages of low voltage operation, no radiation scattering, light weight and small size. [0003] Generally speaking, since the liquid crystal display panel does not have the characteristic of self-illumination, a backlight module must be placed under the liquid crystal display panel to provide the light source required by the liquid crystal display panel. Traditional backlight modules can be roughly divided into two categories, one is a backlight module composed of cold cathode fluor...
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Inventor 邓天宇
Owner CORETRONIC (SUZHOU) CO LTD