Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 18, 2020	Jun. 28, 2019
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	The sole purpose of this amendment to our Annual Report on Form 10-K for the year ended December 31, 2019, originally filed with the Securities and Exchange Commission on February 20, 2020, is to file a revised Exhibit 23.1, Consent of Independent Registered Public Accounting Firm, to the Form 10-K.  As originally filed, the last sentence of the substantive paragraph set forth in Exhibit 23.1 mistakenly read: “Our report on the Consolidated Financial Statements refers to changes in the accounting for revenue and excess tax benefits from share-based payment transactions.” As corrected, such sentence now reads “Our report refers to a change in the accounting methods for revenue and leases.”
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Trading Symbol	OLED
Entity Registrant Name	UNIVERSAL DISPLAY CORPORATION
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001005284
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NASDAQ
Entity File Number	1-12031
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-2372688
Entity Address, Address Line One	375 Phillips Boulevard
Entity Address, City or Town	Ewing
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08618
City Area Code	609
Local Phone Number	671-0980
Document Annual Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		47,187,793
Entity Public Float			$ 7,951,407,550
Documents Incorporated by Reference	Portions of the registrant’s Proxy Statement for the 2020 Annual Meeting of Shareholders, which is to be filed with the Securities and Exchange Commission no later than April 29, 2020, are incorporated by reference into Part III of this report.