Method of manufacturing organic electroluminescent display device and organic electroluminescent display device and display device equipped with organic electroluminescent display device
a technology of display device and display device, which is applied in the direction of discharge tube luminescnet screen, non-linear optics, instruments, etc., can solve the problems of difficult and thus costly placement of microlenses, poor light output efficiency, and loss of light, so as to increase the output efficiency of light and reduce the electrical power consumption of display device equipped with organic electroluminescent display
Inactive Publication Date: 2006-12-21
SEIKO EPSON CORP
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- Application Information
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Benefits of technology
This approach increases light output efficiency by refracting light above the critical angle, reducing electrical power consumption and avoiding damage to the organic luminescent layer, while allowing for easier manufacturing of organic electroluminescent display devices with improved luminance and reduced crosstalk.
Problems solved by technology
With surface emitting elements such as the organic panel 101a, a problem is encountered in that light is lost and thus the light output efficiency is poor, as the light Lp from the pixel including the light-emitting element 114 is diffused in all directions and light Lu, having an angle exceeding the critical angle with regard to the surface of the glass 111, cannot be emitted to the outside of the glass 111 due to a total reflection phenomenon.
However, with such a conventional configuration, it is difficult and thus costly to place the microlens 2 inside the light transmissive base board 1.
Further, for the active matrix driven organic EL light-emitting device 40, the manufacturing seems problematical, as the substrate process becomes a high temperature process of about 500 degrees that requires the microlens 42 itself to be able to withstand such high temperatures.
If the diameter of the microlens is less than 1 μm, the optical focal power decreases due to a diffraction phenomenon, and if the diameter of the microlens is more than 50 μm, the distance between the microlens and the light-emitting part is too close compared to the focal distance, and thus a problem arises in that the loss of light increases as not all of the light scattered in all directions can be refracted above the critical angle.
Further, when therefore forming the light-emitting part in a spaced apart position, close to the focal distance, not all of the light scattered in all directions can be made to enter the microlens that is directly below the light-emitting part, and some will enter the microlens of a different light-emitting part, thereby creating the risk of inducing a crosstalk phenomenon.
Method used
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Embodiment Construction
[0061] Following is an explanation of a preferred embodiment with reference to the drawings.
[0062]FIG. 1 is a sectional view showing an example of a configuration of an organic electroluminescent (EL) panel 1 to which an organic electroluminescent display device as a preferred embodiment of the present invention is applied.
[0063] The organic EL panel 1 is to be mounted to a display device, and includes a substrate 11, a microlens 17, a low refractive index resin 5, a transistor 12, a wiring 7, an insulating layer 9, an anode 15, an organic luminescent layer 14, and a cathode 13. This organic EL panel 1 is a sealant substrate light-emitting organic EL panel that emits light from the surface of the substrate 11 towards the outside (lower part of the drawing).
[0064] The substrate 11 is a transparent substrate like a glass plate. On this substrate, the low refractive index resin 5 is provided. In the inner part of this low refractive index resin 5, a microlens array composed of an ar...
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Abstract
A method of manufacturing an organic electroluminescent display device, an organic electroluminescent display device, and a display device equipped with an organic electroluminescent display device are provided that enable a microlens to be formed without affecting an organic luminescent layer during the manufacturing process and to easily manufacture an organic electroluminescent display device with increased light output efficiency. According to the method, a lens pattern corresponding to a microlens that refracts the light from an organic luminescent layer is formed by performing photolithography treatment on a first transparent resin film formed on a substrate, and the microlens is formed by performing reflow treatment on the lens pattern.
Description
RELATED APPLICATIONS [0001] This application is a divisional patent application of U.S. Ser. No. 10 / 862,189 filed Jun. 4, 2004, claiming priority to Japanese Patent Application No. 2003-162687 filed Jun. 6, 2003, all of which are hereby incorporated by reference.BACKGROUND [0002] 1. Field of the Invention [0003] The present invention relates to a method of manufacturing an organic electroluminescent display device, an organic electroluminescent display device, and a display device equipped with an organic electroluminescent display device, the organic electroluminescent display device making a display through the light-emitting state of a plurality of organic luminescent layers. [0004] 2. Description of the Related Art [0005] Current display devices can be classified into CRTs (Cathode Ray Tubes) and flat display panels composed of various types of elements. Flat display panels are light-weight and have a better luminous efficiency than CRTs, and have been developed over the years f...
Claims
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IPC IPC(8): H01J1/62G02B3/00G02F1/1335H01L21/00H05B33/02H05B33/10H05B33/12H05B33/14H05B33/22H05B33/26H10K99/00
CPCH01L51/5275H01L27/3244H10K59/12H10K59/879H05B33/10H10K50/858
InventorYOTSUYA, SHINICHI
OwnerSEIKO EPSON CORP