Optical Films for Backlight Module

The Introduction For Backlight Unit Structure

Backlight module is mainly structured by light source (LED lamps), light guide plate, reflection film, diffusion film, Brightness Enhancement Film/ prism sheet, light shade film, etc.  So, we can see that backlight module is made by many optical films and the light which is emitted by LED lamps goes through these optical films has been redistributed. And the light is fading at the same time. According to the research, if the light from the traditional backlight source is 100%, there will be only about 60% of the light to reach the polarizing film after going through reflection film, diffusion film and other optical films, and finally it will be only about 4-8% light passing through the liquid crystal and the polarizing films.

The backlight unit is the highest cost components in the LCD panel (it is about 20-30%). The larger the LCD panel, the greater the proportion of the cost the backlight module.  For example: it is about 20-25% in the cost of 15 inch -17 inch LCD panel and it is more than 25% in the 30 inch above. With the trend of popular for large size LCD panel, backlight module is becoming more important than ever. And optical films which are very important are about 40% in the cost of backlight module.

The Cost Composition Of Backlight Module

size(inch)

15.4

17

26

32

        40-42

        46-47

LED

9

17

23

22

19

23

Light Guide Plate

10

12

0

0

0

0

Diffusion Ffilm

13

8

13

17

19

18

Reflection Ffilm

6

6

2

5

3

2

Brightness Enhancement Film/ Prism Sheet

25

12

11

9

24

20

Outer Frame

12

13

8

7

5

5

Other Material

25

32

43

40

30

32

Total

100

100

100

100

100

100

Light Source.

Backlight unit is the most power consumption part of LCD panel. LED backlight unit can reach higher color saturation and brightness in lower power consumption. Also, the LCD panel can be made thinner than ever. There are many light sources for backlight. You can see their differences at my blog

LED light source is the best so far. Led backlight is divided into bottom led backlight and edge led backlight, we can also see their differences at my blog

Light Guide Plate

Great majority of light guide plates are made by PMMA. It can improve the brightness and uniformity of the light by guiding the direction of the light. It is the most important technology and major cost of backlight unit.

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