Design of a backlight module with a freeform surface by applying the Taguchi method

Yingcong Chen; Shangsheng Wen; Pengcheng Song

doi:10.3788/COL201513.032302

Journals >Chinese Optics Letters >Volume 13 >Issue 3 >Page 032302 > Article

Chinese Optics Letters
Vol. 13, Issue 3, 032302 (2015)

Design of a backlight module with a freeform surface by applying the Taguchi method

Yingcong Chen¹, Shangsheng Wen^1、2、*, and Pengcheng Song¹

Author Affiliations

¹Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China

²State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

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DOI: 10.3788/COL201513.032302 Cite this Article Set citation alerts

Yingcong Chen, Shangsheng Wen, Pengcheng Song. Design of a backlight module with a freeform surface by applying the Taguchi method[J]. Chinese Optics Letters, 2015, 13(3): 032302 Copy Citation Text

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Fig. 1. Direct type LED backlight module (a) traditional structure; (b) new structure with a freeform surface.

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Fig. 2. Mathematical model of the freeform surface.

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Fig. 3. S/N ratios of (a) uniformity and (b) luminance at different levels.

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Fig. 4. Relationship between the luminance and the thickness of the cavity.

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Fig. 5. Luminance map of the backlight module with optimized parameters.

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Symbol	Parameter Description	Number of Levels	Level 1	Level 2	Level 3
A	Microstructure	3	no	Cone	Cylinder
B	Light mixing distance	3	38	30	25
C	Arrangement of LEDs	3	Triangle	Square	Hexagon
D	Mounting angle of LEDs	3	0°	50°	90°

Table 1. Control Factors and Levels for Backlight Module Quality

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Experiment Number	A	B	C	D	Uniformity	Luminance (nits)	S/N of Uniformity	S/N of Luminance
1	1	1	1	1	55.64	6890.07	34.91	76.76
2	1	2	2	2	66.86	7181.67	36.50	77.12
3	1	3	3	3	68.50	7322.62	36.71	77.29
4	2	1	2	3	61.96	6881.79	35.84	76.75
5	2	2	3	1	67.94	7536.03	36.64	77.54
6	2	3	1	2	63.59	7204.62	36.07	77.15
7	3	1	3	2	65.93	7127.34	36.38	77.06
8	3	2	1	3	64.00	7139.51	36.12	77.07
9	3	3	2	1	66.44	7522.38	36.45	77.53

Table 2. Experiments Designed with a L9(34) Orthogonal Array

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	Factor	A	B	C	D
Uniformity	${SS}_{d}$	0.11	1.00	1.19	0.16
	Contribution (%)	4.65	40.46	48.36	6.53
Luminance	${SS}_{d}$	0.04	0.37	0.14	0.09
	Contribution (%)	5.98	58.53	21.46	14.03

Table 3. ANOVA Results of Uniformity and Luminance

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$y / x$	$- 165$	0	165
223	7318.554	7388.185	7229.667
0	8062.3365	8655.6785	8142.987
$- 223$	7299.869	7460.407	7502.769

Table 4. Luminance of the Backlight Module with Optimized Parameters in a Nine-Point Test

Yingcong Chen, Shangsheng Wen, Pengcheng Song. Design of a backlight module with a freeform surface by applying the Taguchi method[J]. Chinese Optics Letters, 2015, 13(3): 032302

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