Current control module of LCD backlight driver IC
A current control module and backlight driving technology, which is applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problems of backlight LED flickering, limited brightness level, poor brightness flexibility, etc., to avoid EMI interference, smooth and excessive brightness, structure simple effect
Active Publication Date: 2012-12-19
湃勒斯智能科技(山东)有限公司
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Problems solved by technology
This method will cause the backlight driver IC to be turned on and off frequently, which is very likely to cause EMI interference (Electro magnetic Interference, electromagnetic interference), and the load changes caused by frequent switching of the IC make the output voltage unstable and cause the backlight LED to flicker and other problems.
[0004] At present, there are also some practices in the industry to use backlight driver ICs with I2C bus (Inter-Integrated Circuit) or counting the number of pulses to control the current output. Such ICs will not cause frequent startup and shutdown problems, but the brightness level Limited, and the brightness level is fixed, the flexibility to adjust the brightness is very poor, and cannot achieve a smooth transition when realizing some LCD backlight brightness gradient effects
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[0022] The present invention provides a current control module of an LCD backlight driver IC. The current control module is connected in series between the PWM signal output terminal of the LCD backlight driver IC and the input terminal of the LCD backlight LED lamp group for continuous adjustment of the flow through the LCD backlight The current of the LED lamp group can achieve smooth and excessive LCD backlight brightness without generating EMI interference.
[0023] In order to make the objectives, technical solutions and effects of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.
[0024] See figure 1 The current control module 110 of the LCD backlight driver IC provided by the present invention is connected ...
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The invention discloses a current control module of an LCD backlight driver IC. The current control module is arranged between the LCD backlight driver IC and an LCD backlight LED light set, wherein the current control module comprises a charge pump and an MOS tube set; the input end of the charge pump is connected with a power supply, while the output end is connected with the LED light set; a first input end of the MOS tube set is connected with the LCD backlight driver IC; a second input end is connected with the LED light set; and the output end of the MOS tube set is grounded. The current control module of the LCD backlight driver IC of the invention can continuously adjust the current grade of the LED light set only by controlling the LCD backlight driver IC to output a proper PWM signal, so that the brightness of the LCD backlight is smoothly adjusted and EMI interference is avoided. Meanwhile, the current control module of the invention has the characteristics of simple structure and low cost.
Description
Technical field [0001] The invention relates to an LCD backlight brightness control device of an electronic product, in particular to a current control module of an LCD backlight driving IC. Background technique [0002] At present, LCD (Liquid Crystal Display, liquid crystal display) backlights of mobile terminals generally use parallel LED (Light Emitting Diode) lamps, which usually need to be controlled by a driver IC (integrated circuit, integrated circuit) The brightness of the LCD backlight. [0003] The traditional parallel LCD backlight driver IC generally has an enable port, and the user can adjust the LED backlight current by sending a PWM (Pulse Width Modulation) signal to the enable port. In this way, the backlight driver IC will be turned on and off frequently, which is very easy to cause EMI interference (Electro Magnetic Interference), and the load change caused by frequent switching of the IC makes the output voltage unstable and causes the backlight LED to flicker...
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IPC IPC(8): G09G3/36H05B37/02
Inventor 顾建良顾瞻
Owner 湃勒斯智能科技(山东)有限公司