Cover Page	12 Months Ended
	Dec. 31, 2019 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Transition Report	false
Document Annual Report	true
Document Shell Company Report	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	LG Display Co., Ltd.
Entity Central Index Key	0001290109
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	357,815,700
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Address, Country	KR
ADS [Member]
Document Information [Line Items]
Trading Symbol	LPL
Title of 12(b) Security	American Depositary Shares, each representing one-half of one share of Common Stock
Security Exchange Name	NYSE
Common Stock [member]
Document Information [Line Items]
Trading Symbol	LPL
Title of 12(b) Security	Common Stock, par value W5,000 per share
Security Exchange Name	NYSE