液晶显示器背光模组(LCD)光学概论.

1 2
'
n 1
n1 ; n2
sin1 n1 sin ' sin 2 n2 sin '
n1 n2 1 2
14
Refraction index v.s. LGP
refraction indexeffective area of luminary
L2 L1
refraction rule.
5
The Reflection Rule of Light
In
N
1,insert line( In ),normal( N )
Out
and reflect line( Out ) are on the same plane.

'
2,insert angle is equal to the
1
1
c
n' c sin Critical angle n
1
n
n'

2
c
Total reflection
c Normal refraction
9
Diffusion
When parallel light waves through rough surfaces or particles, diffusion will be formed by the reason that nonparallel factor of the normal for those surfaces and particles.
10
Roughness
The diffusion effect depends on the roughness of the interface of the media.
R1
R1 R2 R3 R4
R2
R3
R4
11
Applied optics to LGP
fundamental principles--total reflection and diffusion the optical properties of the printed units the optical properties for different types of reflection units the properties of the print-less LGPs
c1 c 2
d1 d2
n1
x2
c2
d2
x1 x2
Lamp reflector
prism lens
diffuser
LGP
CCFL
Patterns (elements)
reflector
4
The Reflection and Refraction of Light
1,Reflection and refraction phenomena will happen on the interface when light transports through it. 2, the reflection of light acts according to the reflection rule. 3, the refraction of light acts according to the
sin sin ' '
0

2
0 '

2
What’s happened when ' ?
2
8
The Critical Angle and Total Reflection
When n
n' and
'

2
n' sin sin n 2
12
Critical angles and total reflection of LGP
n 1
Critical angle c
c
'

2

2
1
n
1
1 c sin n
13
Refraction Index v.s. LGP
Refraction indexproper energy
Section 2
III,Applied Optics in the Construction of the Back-light Modules IV,The future of the Back-light Modules
3
The main optical units constructed in back-light modules
reflection angle.
'
6
The Refraction Rule of Light
In
N
1, ,insert line( In ),normal( N )
and reflect line( Rfr ) are on the same plane.
'
n
n'

2,insert angle and refraction
Rfr
angle act according to the
Snell’s law
n sin n' sin '
7
The meanings of the Snell’s Law
1,if n n'
sin sin ' '
0

2
0 '

2
2,if n n'
c2
c1
1 c sin1 n
n1 n2 c1 c 2 L1 L2
15
Refraction Index v.s. LGP
折射率大者,單位面積能量使用率較大
x1
c1
d1
( x, ) f ( x ) g (d)
n1 n2
THE THEORY AND DEVELOPMENT OF THE BACKLIGHT SYSTEM FOR LIQUID CRYSTAL DISPLAYS
Biblioteka Baidu
1
液晶顯示器的結構
實物圖
Color filter
LCD
PCB
Backlight module
2
contents
Section 1
I, Introduction to Fundamental Optics II,Apply Optics to LGP