Organic Light-Emitting Display Device

• US 20080001544A1
• Filed: 03/29/2007
• Published: 01/03/2008
• Est. Priority Date: 12/11/2002
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: MIKAMI, Yoshiro, ONISAWA, Kenichi, ISHIHARA, Shingo, SHIMIZU, Masao, NISHIMURA, Etsuko, MURAKAMI, Hajime
• Granted Patent: US 7,629,743 B2
• Time in Patent Office: Days
• US Class Current: 315/169.3
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/341 Short-circuit prevention
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

The present invention provides OLEDs of the top emission type comprising organic light-emitting (LE) elements by preventing the problems such as the widening of the power lines, the reduction in the aperture ratio caused by the widening of the upper and the lower capacitor electrodes and the short circuit between the upper and the lower electrodes caused by the roughness of the flattening layers. Two kinds of the OLEDs are provided. One is an OLED comprising a region of LE layer sandwiched between the upper and lower electrodes is formed on a power line of TFT for driving the pixel. Another comprises a region of the LE layer formed on an electrode of capacitor connected to the TFTs to control the light-emitting element. Accordingly, without forming a flattening layer on the light-emitting layer, there is no electric short circuit between the lower electrode and the upper electrode.

Claims

1. An actively driven OLED having pixels comprising:

a substrate;

thin film transistors for driving the pixels; and

organic light-emitting elements each provided for each pixel,

each transistor having a power line,

each organic light-emitting element having a pair of electrodes,

one of the electrodes provided on the substrate to function as a cathode,

the organic light-emitting element provided on this electrode,

the other of the electrodes provided on this organic light-emitting element to function as an anode, and

the power line provided between the substrate and the organic light-emitting elements.

6. An actively driven OLED according to claim 1, wherein the one of the electrodes comprises A1.

7. An actively driven OLED according to claim 1, wherein a part of the power line that is located over at least one line intersecting the power line has a smaller plane shape than that of the other part thereof.

2-5. -5. (canceled)