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Segment information (Tables)

12 Months Ended

Dec. 31, 2022

Text block [abstract]

Financial Segment Information for Operating Segments

The segment information provided to the chief operating decision maker for the reportable segments is as follows:

		Year ended December 31, 2020
		Testing		Assembly		LCDD		Bumping		Others		Elimination		Total
		NT$000		NT$000		NT$000		NT$000		NT$000		NT$000		NT$000
Revenue
External customers		5,002,730		6,001,964		7,023,003		4,983,684		—		—		23,011,381
Inter-segment		—		—		—		—		39,646		(39,646)		—
Total revenue		5,002,730		6,001,964		7,023,003		4,983,684		39,646		(39,646)		23,011,381
Operating profit (loss)		1,333,682		67,730		1,687,986		487,323		(10,230)		11		3,566,502
Depreciation expenses		(853,829)		(523,341)		(2,213,504)		(578,890)		(5,955)		—		(4,175,519)
Share of profit (loss)    of associates		—		—		—		—		(320,578)		173,249		(147,329)
Interest income		—		—		—		—		27,778		—		27,778
Interest expense		—		—		—		—		(162,400)		—		(162,400)
Purchase of property,    plant and equipment		887,204		803,693		2,143,401		298,834		483		—		4,133,615

		Year ended December 31, 2021
		Testing		Assembly		LCDD		Bumping		Others		Elimination		Total
		NT$000		NT$000		NT$000		NT$000		NT$000		NT$000		NT$000
Revenue
External customers		5,899,600		7,963,714		8,211,099		5,325,622		—		—		27,400,035
Inter-segment		—		—		—		—		43,808		(43,808)		—
Total revenue		5,899,600		7,963,714		8,211,099		5,325,622		43,808		(43,808)		27,400,035
Operating profit (loss)		1,814,021		857,304		2,336,394		561,642		(6,987)		15		5,562,389
Depreciation expenses		(921,999)		(576,138)		(2,579,150)		(549,020)		(7,805)		—		(4,634,112)
Share of profit (loss)    of associates		—		—		—		—		1,211,177		(585,444)		625,733
Interest income		—		—		—		—		9,980		—		9,980
Interest expense		—		—		—		—		(120,998)		—		(120,998)
Purchase of property,    plant and equipment		1,841,359		1,553,475		2,748,697		408,751		420		—		6,552,702

		Year ended December 31, 2022
		Testing		Assembly		LCDD		Bumping		Others		Elimination		Total
		NT$000		NT$000		NT$000		NT$000		NT$000		NT$000		NT$000
Revenue
External customers		5,243,997		6,705,898		7,288,642		4,278,527		—		—		23,517,064
Inter-segment		—		—		—		—		50,600		(50,600)		—
Total revenue		5,243,997		6,705,898		7,288,642		4,278,527		50,600		(50,600)		23,517,064
Operating profit (loss)		1,253,477		(93,585)		1,795,741		268,159		(6,821)		(292)		3,216,679
Depreciation expenses		(1,042,455)		(694,835)		(2,505,297)		(500,863)		(8,452)		—		(4,751,902)
Share of profit (loss)    of associates		—		—		—		—		884,555		(430,840)		453,715
Interest income		—		—		—		—		57,199		—		57,199
Interest expense		—		—		—		—		(142,439)		—		(142,439)
Purchase of property,    plant and equipment		1,086,682		957,790		2,677,489		196,521		—		—		4,918,482

Schedule of information on products and services

e)Information on products and services

		Year ended December 31,
		2020				2021				2022
		NT$000		%		NT$000		%		NT$000		%
Testing		5,002,730		22		5,899,600		22		5,243,997		22
Assembly		6,001,964		26		7,963,714		29		6,705,898		29
LCDD		7,023,003		30		8,211,099		30		7,288,642		31
Bumping		4,983,684		22		5,325,622		19		4,278,527		18
		23,011,381		100		27,400,035		100		23,517,064		100

Geographic Information of Revenue

f)Geographical information

		Year ended December 31,
		2020		2021		2022
		NT$000		NT$000		NT$000
Revenue
ROC		18,341,726		21,608,567		18,671,142
Japan		1,291,026		1,768,460		1,989,805
PRC		1,105,535		1,899,362		1,970,943
Singapore		1,838,394		1,630,733		390,488
Others		434,700		492,913		494,686
		23,011,381		27,400,035		23,517,064

		December 31, 2021		December 31, 2022
		NT$000		NT$000
Non-current assets
ROC		21,506,565		21,677,980
PRC		86		2,291
Others		6,245		576
		21,512,896		21,680,847

Net Revenue from Customers Representing at Least 10% of Total Revenue

The information on the major customers which constituted more than 10% of the Group’s total revenue for the years ended December 31, 2020, 2021 and 2022 is as follows:

		Year ended December 31,
		2020				2021				2022
		Amount		%		Amount		%		Amount		%
		NT$000				NT$000				NT$000
Customers
Customer A		5,088,544		22		5,681,277		21		4,705,064		20
Customer B		2,365,945		10		2,484,611		9		1,868,583		8
Customer K		2,332,914		10		2,519,631		9		1,830,076		8
Customer M		1,674,801		7		2,832,088		10		2,278,645		10

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