LCD Module

LEC Module : Drive & Cahracteristic
Express images by controlling light permeated into pixel, according to each pixel ' s signal input from the drive circuit unit.

A liquid crystal-injected Panel between substrates

1. Upper plate glass (deals with a polarizing plate/color filter/ Polymer)
   
2. Liquid Crystal
   
3. TFT lower plate glass (deals with a polarizing plate/color filter/ Polymer)

PCB to which driver LSI for driving panel and all kinds of circuit elements.
Structure including plane light Backlight Unit

Role and Composition of Backlight
Located in the back of LC that cannot radiate by itself, it supplies an even plane light in the direction of Panel.

Characteristics of Backlight for each parts

Diffuser Sheet

• TT(%) : light transmittance
  
• HAZE(%)
  
• Luminance
  
• A dhesive strength and fusibility (alcohol)
  
• Hardness :Taber abrasion tester
  
• Gloss: Indicates the degree by which film surface reflects light directly.
  
• Surface Resistance
  
• Mixed forms electric conduction layer and thus leak an electric charge.
  
• weather resistance , high temperature/high humidity

Prism Sheet

• Luminance increases by condensing effects.
  
• Pattern of preventing wet-out phenomena
  
• Minimize moire
  
• Reduce image cut-off

LPG(Light Guide Panel or Plate)

PC, PMMA , Zeonor Resin Injection Molding, Casting Dispersion of Light/Diffusion for induction /forms reflective pattern : Print style/ non-print style

Non-print style

• Stamper style : Electroforming, Etching, Blasting etc.
  
• V-cut style : Direct V-groove processing / metallic direct processing

Characteristics of Backlight technology

Light source

• High Brightness
  
• High density Make BL slim
  
• Minimize drive voltage: Minimize power consumption / Control generation of heat
  
• Required techniques
  - High Current Driving Technology & Thermal Stability
  - New Phosphor & Electrode Material
  - Optimize Phosphor Coating & Baking Method

Optical Sheet

• Required techniques
  - Good Thermal Stability
  - New Resin Material
  - Good Injection Molding
  - Optimize Pattern Design

Light Guide Panel(LGP)

• Required techniques
  - Good Thermal Stability
  - New Resin Material
  - Good Injection Molding
  - Optimize Pattern Design

Development of Super Brightness Backlight and technological overview
To realize super brightness required for LCD Display, our company came to recognize the need to develop innovative Back Light. Through the development for about five years, we succeeded in developing backlight that has super brightness 50% higher than before, even after removing a piece of Prism sheet, which plays a crucial role for increase of brightness and for cost of products. That is, to make Prism Sheet function perform in Light Guide Panel, we accumulated Prism form acquired through optics simulation and Micro pattern best constructed to Light Guide Panel. Thus, we developed high-efficiency backlights for the first time in the country, and are now in the process of mass production.

Prism LGP

Prism LGP Backlight light characteristics result

		Conventional BLU	Prism BLU	Remarks
Sheet composition		Prism sheet(2) + diffuser Sheet + LGP + reflector Sheet	diffuser Sheet + Prism Sheet (1) + Prism LGP + reflector Sheet	Prism Sheet remove one
Luminance	1P	1,940 cd/m2	2,720 cd/m2	40 % ↑
	5P	1,840 cd/m2	2,560cd/m2	37 % ↑
	17P	1,816 cd/m2	2,455cd/m2	35 % ↑
Uniformity	9P	1.20	1.22
	17P	1.35	1.55
Screen