Back Light Unit

What is BLU(Back Light Unit)?

Signals from LCDs are impossible to use without a light because they don't emit light like CRT, PDP and FFD, A BLU makes the signal surface visible in the dark by light up the background.

Structure of BLU

LED(Light-Emitting Diode) - LED Type : Line LED, Surface LED, Spot LED.
CCFL(Cold Cathode Fluorescence Lamp) is used for big products and LED is used for small products like a mobile. (A diameter of CCEL, 16mm ~ 2.2mm is used generally and life is about 15,000 ~ 60,000 hours)

Mold Frame
The mold frame is used to assemble all component parts such as luminescent plating board, sheet types and the lamp. It's function is to maintain the form.

Reflector Sheet
It functions to reflect light coming out of the back-board of luminescent plating and increase general brightness. It protects the loss of light from the back side of luminescent plating board.

LPG, Light Guide Panel(=Luminescent plating board)
Acrylic paneling is generally used in construction. The component uniformly spreads the light which comes into the lamp to the whole screen. It helps to print consistent patterns on LGP. One ordinary lamp is used for the backlight for a laptop. The taper type is characterized by being thicker on the lamp side while thinning on the opposite side.

Diffuser Sheet
It makes the radiated light from LGP more consistent and soft. Also it makes LGP's pattern(Dot or cross strips) remain hidden.

Prism or BEF(Brightness Enhancement Film)
It concentrates light and increases brightness, which had been decreased by the spreadsheet. The prism sheet has a subtle pitch, as in the shape of a mountain, and the lower side is vertical while the upper side is horizontal. Usually two sheet are used as one set.

Protector Sheet
The prism sheet is used to protect from shock, stain and foreign material because the prism sheet is very sensitive to these. Also it removes the indirect appearance of vertical and horizontal prism sheet, Recently, prism sheet's function is improved. The are more models that don't use protector sheets.

LED FPCB(Flexible Printed Circuit Board)
Component which makes LED(Light Emitting Diode) Luminescent when power is on after putting LED on FPCB by SMT(Surface Mounted Technology).

Product Development Process

2003 of Production

2004 of Production

2005 of Production

BLU Technology Status

L.G.P Development Technology

• Various Pattern Program and Design Technology Possession through Visual Pattern
• Intended to minimize variation of actual products and to defray failure cost by SPEOS Application, which is Optical Simulation Program.
• L.G.P Pattern Processing Technology
  Building Diffusion Type Pattern Processing Database by Etching Method
  Building Diffusion Type Pattern Processing Database by Laser Method
  High Brightness BLU Development by Prism Pattern Processing which used direct processing machine
  Pattern Processing which used Reflex Type Pattern Processing Stamper Technology and Database Building Semiconductor Process

High Bright Back Light Unit Development

• Prism less BLU Development Prism Coating Board Development through Optical Simulation
• High Brightness One Chip BLU Development which Utilize Direct Processing Machines
• Sheet less BLU Development

The Shortest Time Development and Supply with Ample Design Experience

Generally, it takes 20days from product design through manufacturing a product mold and supplying samples from product development receipt date(In case of emergency, 13days is possible.)