Organic electroluminescent display device with performed images

• US 6,424,093 B1
• Filed: 10/06/2000
• Issued: 07/23/2002
• Est. Priority Date: 10/06/2000
• Status: Expired due to Term

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Bilhorn, Robert B., Tutt, Lee W., Culver, Myron W., Mir, Jose M.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Alemu, Ephrem
• Application Number:
  US09/684,193
• Time in Patent Office: 655 Days
• Field of Search: 315/169.3, 315/169.1, 315/169.4, 345/76, 345/82, 345/83, 313/500, 313/503, 313/504, 313/506, 396/287, 428/690
• US Class Current: 315/169.3
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/221 Static displays, e.g. displaying permanent logos
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/805 Electrodes

Abstract

An organic electroluminescent display device that displays a preformed image includes spaced anode and cathode electrodes, organic electrically conductive hole transport layer and electron transport layer disposed between the anode and cathode electrodes, and a preformed image layer formed between the organic electrically conductive hole transport layer and electron transport layers such layer having a region that is preformed to have at least one preformed image such that when a voltage is applied across the anode and cathode electrodes which will cause a preformed image to be displayed. Voltages are applied across the anode and cathode electrodes of the organic electroluminescent display device causes the emission of light for viewing the preformed image.

Claims

1. An organic electroluminescent display device that displays a preformed image, comprising:

a) a single anode and a single cathode electrode spaced from each other;

b) organic electrically conductive hole transport layer and

c) a preformed patterned image layer disposed between the hole transport and electron transport layers and having different units formed of different color luminescent species which emit light in different areas of the spectrum to provide multicolor to a preformed image such that when a voltage is applied across the anode and cathode, electrodes cause a multicolor preformed patterned image to be displayed; and

d) means for applying a voltage to the anode and cathode electrodes to cause the emission of light to display the preformed patterned image.

2. The organic light emitting display device of claim 1 wherein the color luminescent species include red, green, and blue color luminescent species.

3. The organic electroluminescent display device of claim 1 wherein the units of the preformed layer are formed of different color luminescent species which have different concentrations.

4. The organic light emitting display device of claim 1 wherein the units of the preformed layer have different color luminescent species which have different concentrations to provide a continuous tone image.

5. The organic electroluminescent display device of claim 1 wherein the preformed layer is provided with light emitting material which emits light and wherein in certain areas the preformed layer does not emit light in a spatial pattern to produce the preformed image.

6. The organic light emitting display device of claim 1 wherein the preformed layer includes luminescent species which have been quenched to prevent the emission of light in positions to define the units in the preformed image layer.

7. The organic electroluminescent display device of claim 1 wherein the units are of different sizes such that when a voltage are applied across the anode and cathode electrodes which will cause a preformed image to be displayed.