LED boost converter and backlight source LED driving device applying LED boost converter

Abstract

The invention discloses an LED boost converter and a backlight source LED driving device applying the LED boost converter. The LED boost converter comprises an inductance type booster circuit for boosting input voltage to working voltage required by an LED working in the current display mode in different display modes, a detection circuit for selecting detection resistors corresponding to different display modes so as to provide different detection currents for the inductance type booster circuit in different display modes, a controller used for providing a pulse width modulated signal to drive the inductance type booster circuit to work and detecting whether detection voltages corresponding to the detection currents exceeds reference voltage. By arranging the detection circuit in the LED boost converter, the detection resistors corresponding to working currents are respectively exist in a 2D display mode and a 3D display mode, and possible element damage or abnormal protection in the 3D display mode is prevented.

Description

technical field [0001] The invention relates to liquid crystal display technology, in particular to an LED boost converter and a backlight LED driving device using the same. Background technique [0002] In recent years, with the thinner display trend, Liquid Crystal Display (LCD for short) has been widely used in various electronic products, such as mobile phones, notebook computers, and color TV sets. [0003] Since the liquid crystal itself does not emit light, the LEC panel itself does not have the characteristic of emitting light, so it needs an illumination source, and it is a backlight display device. The imaging principle of the liquid crystal display is that after the electrodes in the panel are energized, the liquid crystal molecules will be twisted after the electrodes are energized, so that the light of the backlight module can pass through and emit light. Backlight is an optical component that provides a back light source in LCD display products. Therefore, th...

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Problems solved by technology

[0006] However, in conventional designs, such as figure 1 As shown, the resistance for detection will be designed according to the withstand current of the inductor in 2D display mode (R shown in the figure 1 ), and after entering the 3D display mode, due to the change of the peak current, the overcurrent protection function detected by the ISEN pin of the controller (chip CEC8310) cannot perform the same protection function as in the 2D display mode, according to The design of each model is different, there may be component damage or abnormal protection

[0007] Therefore, how to solve the above problems, so as to perform the same overcurrent protection on the circuit under different display modes, and avoid component damage and abnormal protection, is one of the issues that the industry is committed to.

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