LED BACK-LIGHTING
- This set utilizes LEDs as back-lights driven by the Inverters. These LEDs are manipulated in accordance to the necessary Light Source intensity according to the video content (Contrast Ratio) demands.
- Control signals to the Inverters are sent out from the T-CON PWB.
- B+ (24V) is sent from the Power Supply (SMPS).
- There are 8 Vertical columns and 16 horizontal rows for a total of 128 individual LED Blocks. Each Block contains 12 LEDs (3 X 4).
LED SECTION BLOCKS
LED SECTION [1-BLOCK]
'M' & 'S' BACK-LIGHT DRIVE INVERTER SECTIONS
BACKLIGHT BASICS [LED LAYOUT]
The
picture below shows a close up of one of the 1536 individual LEDs contained
within the backlights. There are two sides each with 768 LEDs (64 blocks) in
each side. And the T-CON board
manipulates individual block. These blocks are manipulated Global (All at once)
and in accordance with the video intensity at the specific location of the
block of LEDs for that video content (Local). In other words, if the video is
dark in the area of the screen that is being illuminated by a block of LEDs, they
will be dimmed. Not counting “Black”
there are 3 levels of intensity of the LEDs.
The Overall intensity of the backlights is manipulated by the “Global”
Dimming signal from the BCM chip called Digital-Dimming.
BACKLIGHT LED TESTING
