1. LCD Proces s & Backlight
Eric Huang

2. 2,200
Gen 7.5 1950X2250mm
Gen 8 2200X2500mm

4. LCD Panel structure

5. LCD Module cross-section

6. TFT LCD structure

7. Light Efficiency

8. TN type LCD (Normally black)

9. TN type LCD (Normally White)

10. MVA structure

11. Fujitsu MVA

12. In Plane Switching

13. TFT Process Flow
Glass GATE Electrode Insulator & a-Si DATA Electrode Passivation Pixel Electrode
Deposition & Patterning Process in Detail
Deposition Cleaning PR Coating Exposure Develop Etch PR Strip Inspection
PECVD
RF Wet Etch
H H
H Si H H
N H
H H
H
H
Si N Si N Si N
SPUTTER Dry Etch
Ar+ Gas RF
Al
Al Al
DC Al
Al Al PLASMA
FO
Si Si
Ar+
SiF4
TARGET
SUBSTRATE

14. Thin Film Transistor Structure

15. Five Mask Process Fabrication
Structure

16. Step & Repeat Exposure

17. Cell Process Flow
CF
/
Seal Printing
Cleaning Alignment-Layer Printing Rubbing
Spacer Dispensing
TT
F 3
Assembly Scribing & Breaking LC Injection Auto probe Inspection

19. Spacer Spraying

20. End Seal

21. Short Dispense

23. ODF Change Cell Process

24. Module Process Flow

25. Module Process Flow
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26. Module Bonding Process

27. Anisotropic Conductive Film

28. COG & TAB

29. Structure of Driving Circuit Unit

30. Edge Type BLM Structure
Source: Display Search

31. Direct Type BLM Structure For LCD TV
Source: Display Search

32. BLM
BLM

33. BLM Types By LGP Shape
Flat Type
-- LGP = Light Guide Plate
Lamp Reflector
prism Sheet (BEF)
diffuser
LGP
Reflector
Light source patterns; elements
Wedge Type
Lamp Reflector prism
lens)
LGP
diffuser
reflector
patterns; elements
Light source
Source: Display Search

34. Backlight Structure:
Different Application

35. LGP Manufacturing
Method
V-cut Laser
Fly-cut R-cut

36. Light Guide Technologies
Production Technologies:
1. Print less multi-cavities injection
2. Embossed patterned LGP
LGP with Printed
Dots 1st step:
Micro-pattern for
LGP by Injection
small size
Molding
(Mobile/NB)
Enhance 20%
2nd step:
Brightness Molding LGP with
V-Grooves Scale up for larger
Enhance 20% size (Monitor/TV)
Brightness

38. LGP Process: Injecting

39. LGP Process: Extrusion

40. Diffuser Structure

41. 3M Patent: Brightness
Enhancement Film

42. 3M Patent: DBEF
DBEF
DBEF

43. Mitsubishi Rayon Patent

44. BLM Architecture using LED
LED BLU with Conventi onal LGP LED BLU with High Brightness LGP
LED LGP LGP
a. V-cut b. Fly-cut
Etch pattern
> 20 % Brightness enhancement

45. Arrangement of LED in Backlight

46. The Issues of LED Backlight
Thermal Solution Module Brightness Efficiency
LED Package Improvement
LED Cost
LED Backlight Structure
LED Back light TFT LCD Panel
Heat Sink LED Structure Improvement
Optical
Thermal Fan (RGB or White) Design
RGB
Sensor
LED Color Display
Driving Processing Signal
LED Control IC
Color Stability
management

47. Barriers/Obstacles for w ide adoption of LED BLU
LED Cost
LED Array + Driving circuit
CCFL + Inverter
LED BLU Ultra light and thin product
Ultra light and thin product
ü Required 0.3t glass, new mounting method, etc.
Uniformity
ü Hot spot happens between neighboring LEDs.
Hot Spot
Increase panel Y-dim.
Set design change

48. Barriers/Obstacles for w ide adoption of LED BLU
LED Lifetime
ü No field data in contrast with CCFL.
ü No lifetime data from LED suppliers. ( Just 1,000hrs guarantee)
- By temperature and operating current
Tolerance
LED CCFL
Color Coordin ate Larger than CCFL s +/- 0.02 (SPEC)
Luminance Rank1, 2, 3
+/- 10%
Intensity (10% difference)
WLED for NB BL, the color shift after 5,000 hr is 0.02.
x, y within 0.005 per bin; and 50 % life deca y time exceeds 15,00 0 hr.