Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system
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A technology of power drive and single-chip integration, which is applied in the direction of light source, electric light source, lamp circuit layout, etc., can solve the problem of high chip price, and achieve the effect of high cost performance, good flexibility and strong driving ability
Inactive Publication Date: 2011-05-25
SHANGHAI UNIV
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But the price of these chips is more expensive, the price of a single chip is more than 2 dollars
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Embodiment 1
[0019] Example 1: see figure 1 , This monolithic integrated LED backlight and LCD power drive system, including the main control microcontroller, two MOSFET drive, two groups of L1, D1, Q1, C1, R1, R2, R3, L2, D2, Q2, C2, R4, A boost circuit composed of R5 and R6 and n Controllable constant current source, n It is a natural number, which is characterized in that the PWM signal output by a PWM module on the single-chip microcomputer is amplified by a MOSFET drive and then drives a set of booster circuits to boost the 12V input power to about 30V. n 9 LEDs connected in series with a constant current source; the PWM signal output by another PWM module on the single-chip microcomputer, after being amplified by another MOSFET drive, drives another set of boost circuits to boost the 5V input power to 13V , To provide power for LCD to save a power chip and reduce costs; the AD module on the microcontroller continuously detects the current and voltage of the two boost modules, and n LED ...
Embodiment 2
[0020] The second embodiment: this embodiment is basically the same as the first embodiment, and the special features are as follows: the specific circuit structure of this embodiment is as follows: figure 2 As shown, the main control single-chip microcomputer, MOSFET drive, 12-30V boost circuit composed of L1, D1, Q1, C1, R1, R2, R3, composed of L2, D2, Q2, C2, R4, R5, R6 5-13V boost circuit, 12-channel controllable constant current source and other components. The main control MCU adopts the PIC16F1937 of Microchip Technology Inc., and the working frequency is 32MHz. PIC16F1937 internal PWM2 module outputs PWM signal, boosts the input 12V DC power supply to about 30V, and drives 9 (string) × 12 (parallel) LEDs. The PWM1 module outputs another PWM signal, drives a 5-13V boost circuit, and boosts the input 5V DC power supply to 13V to provide power for the LCD. During the working period of the booster circuit, the AD on the microcontroller continuously detects the current and...
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Abstract
The invention relates to a monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system. The driving system comprises a master control singlechip, two MOSFET (metal-oxide semiconductor field effect transistor) driving paths, two boost circuits composed of L1, D1, Q1, C1, R1, R2, R3, L2, D2, Q2, C2, R4, R5 and R6 as well as n controllable constant current sources, wherein n is a natural number. A PWM (pulse width modulation) signal output by one PWM module on the singlechip is amplified by virtue of the driving of an MOSFET, one boost circuit is driven to supply power to LEDs, about 110 LEDs are driven, and flexible expanding can be realized according to the actual requirement. The PWM (pulse width modulation) signal output by another PWM module on the singlechip is amplified by virtue of the driving of the other MOSFET, and the other boost circuit is driven to boost a 5V input power supply to 13V and supply power to an LCD, thus a power supply chip is saved and the cost is reduced. In the working period of the boost circuits, an AD (analog-digital) converter on the singlechip continuously detects the currents and voltages of the two boost circuits as well as the currents of all the LED channels, the working state of each module is monitored, and perfect protection function is provided for the system. A timer module on the singlechip provides PWM dimming support for the LED. Thus, the monolithic integrated LED backlight and LCD power supply driving system has higher cost performance.
Description
technical field [0001] The invention relates to a system for driving LED backlight and providing power for LCD, in particular to a single-chip integrated LED backlight and LCD power supply driving system. Background technique [0002] Liquid crystal displays (LCDs) have become the protagonists of TVs, computers and monitors of all kinds, and dominate all types of flat panel displays. However, since the LCD screen itself does not emit light, the backlight that provides the light source for the LCD screen plays a very important role. Because LED has the advantages of no mercury, good color reproduction, fast response, energy saving, safety, and small size, it is attracting more and more manufacturers to start developing LED backlights. In small-sized backlight applications, LED backlights have basically replaced CCFLs and become the mainstream of backlights, and the sharp increase in production of medium and large-sized LCD screens in the world will inevitably lead to an incr...
Claims
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