US-12628543-B2 - Pixel configurations for high resolution ovjp printed oled displays

US12628543B2US 12628543 B2US12628543 B2US 12628543B2US-12628543-B2

Abstract

Methods and OLED devices are provided in which organic emissive materials are deposited over a substrate via OVJP print heads in a continuous line extending from one edge of the active display portion of a substrate to another. The print heads are arranged such that the sidewalls of the OVJP jet are disposed over non-emissive insulating portions of the display panel, thereby allowing for improved pixel density and resolution in comparison to conventional OVJP and similar techniques.

Inventors

JinJu LIN
Gregg Kottas
William E. Quinn

Assignees

UNIVERSAL DISPLAY CORPORATION

Dates

Publication Date: 20260512
Application Date: 20240105

Claims (19)

1 . An organic light emitting diode (OLED) display device comprising: a substrate comprising an active display region; a non-emissive insulating layer disposed over the substrate that defines active pixel areas within the active display region; a first organic emissive material disposed over the substrate in a continuous line from a first edge of the active display region to a second edge of the active display region and over at least a first portion of the non-emissive insulating layer and over at least a first portion of the active pixel areas; and a second organic emissive material different than the first organic emissive material disposed in a continuous line from the first edge of the active display region to the second edge of the active display region and over at least a second portion of the non-emissive insulating layer and at least a second portion of the active pixel areas that is different than the first portion of the active pixel areas; wherein at least one of the first and second organic emissive materials is disposed in a line oriented at a 45 degree angle relative to an edge of the substrate.
2 . The OLED display device of claim 1 , wherein the active display region has a resolution of at least 100 ppi.
3 . The OLED display device of claim 1 , wherein the active display region has a resolution of at least 360 ppi.
4 . The OLED display device of claim 1 , wherein the continuous lines in which each of the first and second organic emissive materials are disposed are parallel to an edge of the substrate.
5 . The OLED display device of claim 1 , wherein at least one of the first and second organic emissive materials is disposed in a line oriented at a −45 degree angle relative to the edge of the substrate.
6 . The OLED display device of claim 5 , wherein a line of pixels oriented at the 45 degree angle has twice the density as a line of pixels oriented parallel to an edge of the OLED display device.
7 . The OLED display device of claim 6 , wherein the display comprises the same number of sub-pixels of each of three colors, each of the three colors provided by one of the first or second organic emissive materials.
8 . The OLED display device of claim 1 wherein one of the continuous lines in which the first or second organic emissive materials is deposited is parallel to an edge of the substrate.
9 . The OLED display device of claim 1 , wherein the continuous lines of the first and second organic emissive materials are not the same width.
10 . The OLED display device of claim 9 , wherein the first organic emissive material comprises a blue-emitting material and the second organic emissive material comprises a yellow-emitting material.
11 . A consumer electronic device comprising the OLED display device of claim 1 .
12 . The consumer electronic device of claim 11 , wherein the consumer electronic device is at least one type selected from the group consisting of: a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a mobile phone, a tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display having an active area with a primary diagonal of 2 inches or less, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall comprising multiple displays tiled together, a theater or stadium screen, and a sign.
13 . The OLED display device of claim 1 , wherein the first portion of the non-emissive insulating layer and the second portion of the non-emissive insulating layer are a same portion.
14 . The OLED display device of claim 1 , wherein the first portion of the non-emissive insulating layer and the second portion of the non-emissive insulating layer are different portions.
15 . The OLED display device of claim 1 , wherein at least part of the first portion of the non-emissive insulating layer and at least part of the second portion of the non-emissive insulating layer are a same portion.
16 . An organic light emitting diode (OLED) display device comprising: a substrate comprising an active display region; a non-emissive insulating layer disposed over the substrate that defines active pixel areas within the active display region; a first organic emissive material disposed over the substrate in a continuous line from a first edge of the active display region to a second edge of the active display region and over at least a first portion of the non-emissive insulating layer and over at least a first portion of the active pixel areas; and a second organic emissive material different than the first organic emissive material disposed in a continuous line from the first edge of the active display region to the second edge of the active display region and over at least a second portion of the non-emissive insulating layer and at least a second portion of the active pixel areas that is different than the first portion of the active pixel areas; wherein regions of the first organic emissive material disposed over the active display region are divided into two portions by a backplane to form two separately-addressable regions of the first organic emissive material.
17 . The OLED display device of claim 16 , wherein regions of the second organic emissive material disposed over the active areas are divided into two portions by a backplane to form two separately-addressable regions of the second organic emissive material.
18 . An organic light emitting diode (OLED) display device comprising: a substrate comprising an active display region; a non-emissive insulating layer disposed over the substrate that defines active pixel areas within the active display region; a first organic emissive material disposed over the substrate in a continuous line from a first edge of the active display region to a second edge of the active display region and over at least a first portion of the non-emissive insulating layer and over at least a first portion of the active pixel areas; and a second organic emissive material different than the first organic emissive material disposed in a continuous line from the first edge of the active display region to the second edge of the active display region and over at least a second portion of the non-emissive insulating layer and at least a second portion of the active pixel areas that is different than the first portion of the active pixel areas; a third organic emissive material different than the first and second organic emissive materials in a continuous line extending from the first edge of the active display region of the substrate to the second edge of the active display region of the substrate and over at least the portion of the non-emissive insulating layer that is the same as the portion over which at least one of the first and second organic emissive materials is deposited, and over at least a third portion of the active pixel areas that is different than the first and second portions of the active pixel areas; wherein at least one of the first, second, and third organic emissive materials is disposed in a line oriented at a 45 degree angle relative to an edge of the substrate.
19 . The OLED display device of claim 18 , wherein the continuous line of the third organic emissive material is disposed between the continuous lines of the first and second organic emissive materials.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 17/091,212, filed Nov. 6, 2020, which is a non-provisional of, and claims the priority benefit of U.S. Patent Application Ser. No. 62/936,760, filed Nov. 18, 2019, the entire contents of each are incorporated herein by reference. FIELD The present invention relates to techniques and devices for fabricating organic emissive devices, such as organic light emitting diodes, and devices including the same. BACKGROUND Opto-electronic devices that make use of organic materials are becoming increasingly desirable for a number of reasons. Many of the materials used to make such devices are relatively inexpensive, so organic opto-electronic devices have the potential for cost advantages over inorganic devices. In addition, the inherent properties of organic materials, such as their flexibility, may make them well suited for particular applications such as fabrication on a flexible substrate. Examples of organic opto-electronic devices include organic light emitting diodes/devices (OLEDs), organic phototransistors, organic photovoltaic cells, and organic photodetectors. For OLEDs, the organic materials may have performance advantages over conventional materials. For example, the wavelength at which an organic emissive layer emits light may generally be readily tuned with appropriate dopants. OLEDs make use of thin organic films that emit light when voltage is applied across the device. OLEDs are becoming an increasingly interesting technology for use in applications such as flat panel displays, illumination, and backlighting. Several OLED materials and configurations are described in U.S. Pat. Nos. 5,844,363, 6,303,238, and 5,707,745, which are incorporated herein by reference in their entirety. One application for phosphorescent emissive molecules is a full color display. Industry standards for such a display call for pixels adapted to emit particular colors, referred to as “saturated” colors. In particular, these standards call for saturated red, green, and blue pixels. Alternatively the OLED can be designed to emit white light. In conventional liquid crystal displays emission from a white backlight is filtered using absorption filters to produce red, green and blue emission. The same technique can also be used with OLEDs. The white OLED can be either a single EML device or a stack structure. Color may be measured using CIE coordinates, which are well known to the art. As used herein, the term “organic” includes polymeric materials as well as small molecule organic materials that may be used to fabricate organic opto-electronic devices. “Small molecule” refers to any organic material that is not a polymer, and “small molecules” may actually be quite large. Small molecules may include repeat units in some circumstances. For example, using a long chain alkyl group as a substituent does not remove a molecule from the “small molecule” class. Small molecules may also be incorporated into polymers, for example as a pendent group on a polymer backbone or as a part of the backbone. Small molecules may also serve as the core moiety of a dendrimer, which consists of a series of chemical shells built on the core moiety. The core moiety of a dendrimer may be a fluorescent or phosphorescent small molecule emitter. A dendrimer may be a “small molecule,” and it is believed that all dendrimers currently used in the field of OLEDs are small molecules. As used herein, “top” means furthest away from the substrate, while “bottom” means closest to the substrate. Where a first layer is described as “disposed over” a second layer, the first layer is disposed further away from substrate. There may be other layers between the first and second layer, unless it is specified that the first layer is “in contact with” the second layer. For example, a cathode may be described as “disposed over” an anode, even though there are various organic layers in between. As used herein, “solution processible” means capable of being dissolved, dispersed, or transported in and/or deposited from a liquid medium, either in solution or suspension form. A ligand may be referred to as “photoactive” when it is believed that the ligand directly contributes to the photoactive properties of an emissive material. A ligand may be referred to as “ancillary” when it is believed that the ligand does not contribute to the photoactive properties of an emissive material, although an ancillary ligand may alter the properties of a photoactive ligand. As used herein, and as would be generally understood by one skilled in the art, a first “Highest Occupied Molecular Orbital” (HOMO) or “Lowest Unoccupied Molecular Orbital” (LUMO) energy level is “greater than” or “higher than” a second HOMO or LUMO energy level if the first energy level is closer to the vacuum energy level. Since ionization potentials (IP) are measured as a negative energy relative to a vacuum level, a hi