Light emitting diode (LED) backlight drive circuit, liquid crystal display device and drive circuit
A technology for backlight drive circuit and LED light bar, applied in the field of drive circuit and LED backlight drive circuit, can solve the problems of rising cost and large amount of data, and achieve the effect of saving hardware cost, reducing data storage space, and saving design and development cost.
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Embodiment 1
[0029] Such as image 3 As shown, the LED backlight driving circuit of this embodiment includes a timing control module 10, an LED light bar 20, and a driving module 30 coupled to the output end of the LED light bar 20. The driving module 30 includes at least one constant current for driving the LED light bar 20 to display. The drive chip 31, the timing control module 10 sequentially outputs the drive signal to the constant current drive chip 31; the drive signal includes sequentially arranged data units, each data unit includes a current duty cycle and delay time of an LED light bar 20; constant current drive The chip 31 directly reads the data of the corresponding data unit to drive the display of the LED light bar 20 .
[0030] Constant current drive chip 31 is provided with signal input pin 32 and signal output pin 33; Timing control module 10 is provided with first signal line SI and second signal line SO; Constant current drive chip 31 has multiple, as two, Four, eight,...
Embodiment 2
[0034] Such as Figure 4 As shown, this embodiment also discloses a driving method of the LED backlight driving circuit of the present invention, comprising steps:
[0035] 1. Generate drive signal
[0036] The timing control module generates a driving signal, and the driving signal includes data units arranged serially in sequence, and each data unit includes a current duty cycle and a delay time of an LED light bar;
[0037] 2. LED light bar display
[0038] The constant current driver chip of the driver module directly reads the current duty cycle and delay time of the corresponding data unit, and then drives the LED light bar for display.
[0039] The constant current driver chip can be single-channel or multi-channel. In this embodiment, a dual-channel constant-current driver chip is used, that is, each constant-current driver chip is connected to two LED light bars. At this time, step 1 includes: dividing the driving signal into at least one data packet, each data pac...
Embodiment 3
[0043] This embodiment discloses an LED backlight driving circuit using a single constant current driving chip.
[0044] The LED backlight driving circuit includes a timing control module, an LED light bar, and a driving module coupled to the output end of the LED light bar. The driving module includes at least one constant current driver chip that drives the display of the LED light bar. The timing control module sequentially outputs the driving signal to the constant current Drive chip; the drive signal includes data units arranged in sequence, and each data unit includes the current duty cycle and delay time of an LED light bar; the constant current drive chip directly reads the display of the LED light bar driven according to the data of the corresponding data unit.
[0045] The constant current drive chip is provided with a signal input pin and a signal output pin; the timing control module is provided with a first signal line and a second signal line; the first signal lin...
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