Image displaying device

a technology of displaying device and image, which is applied in the direction of static indicating device, identification means, instruments, etc., can solve the problems of reducing difficult to ensure a high yield and a high quality as the whole, and complicated structure, so as to achieve high yield and high quality without decreasing the aperture ratio of pixels

Inactive Publication Date: 2006-06-22
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration enables efficient current supply to light emitting elements without decreasing aperture ratios, ensures high image quality, and allows for active matrix driving without optical crosstalk, while enabling separate production and quality control of transistor and light emitting element substrates, even with color conversion layers.

Problems solved by technology

As for the wiring, four electrodes of a data line for selecting a current driven typed light emitting element, a scanning line (the vertical electrode and the horizontal electrode), the power supply line, and a ground line are needed, resulting in a complicated structure.
There is a problem that the aperture ratio of pixels is decreased if the line width is increased in order to lower the resistance.
Furthermore, since the yield of the transistor circuit part and the current driven typed light emitting elements are different, there is also a problem that it is difficult to ensure a high yield and a high quality as the whole.
Therefore, the color conversion layer is required to have heat resistance of at least the process temperature 400° C. at the time of transistor fabrication, and it is extremely difficult.
However, since the light emitting layer is extremely vulnerable to moisture, it is extremely difficult to form the color conversion layer directly on the light emitting layer.
In addition to a problem in reliability of the transparent cathode, there is a problem that the image quality is degraded because the light emitting layer and the color conversion layer are optically separated so that the occurrence of optical crosstalk is inevitable.

Method used

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Experimental program
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Effect test

first embodiment

1. FIRST EMBODIMENT

[0028] First, a first embodiment in an image displaying device of the present invention will now be described. An image displaying device of the present embodiment will be described with reference to FIG. 1. FIG. 1 is a diagram showing an example of an image displaying device of the present embodiment. FIG. 1A is a sectional view, and FIG. 1B is a top view. The same numerals as those shown in FIG. 4 denote the same contents, so that detailed description thereof will be omitted.

[0029] In the present embodiment, insulating layers 2 and 3, an anode 4 formed of a transparent conductive film, an organic light emitting layer 5, and a cathode 6 are formed on a glass substrate 1. In addition, a current is supplied to the anode 4 via a transistor for current driving 8 formed on the glass substrate 1.

[0030] In the present embodiment, a power supply common electrode 20 is formed on an entire surface of a facing substrate 13 (corresponding to the facing seal plate 12 in FIG...

second embodiment

2. SECOND EMBODIMENT

[0034] A second embodiment in an image displaying device of the present invention will now be described. The image displaying device of the present embodiment will be described with reference to FIG. 2. In the present embodiment, a substrate having transistors for current driving formed thereon and a substrate having an organic light emitting layer formed thereon are separated. And facing both substrates to each other, a current is supplied per every display cell through a power supply electrode column that extends in between the substrates. A current is supplied without decreasing the aperture ratio, and both substrates which differ in yield can be produces separately.

[0035] A transistor for current driving 8, a transistor for ON / OFF control of the transistor for current driving 8, and a vertical electrode and a horizontal electrode for selecting a display cell that should emit light are formed on a glass substrate 1. From a power supply pad 22 which is connect...

third embodiment

3. THIRD EMBODIMENT

[0041] A third embodiment in an image displaying device of the present invention will now be described. The image displaying device of the present embodiment will now be described with reference to FIG. 3. In the present embodiment, a substrate having transistors for current driving formed thereon and a substrate having an organic light emitting layer with a color conversion layer formed thereon are separated, faced to each other, and a current is supplied per every display cell through an electrode column that extends between the both substrates.

[0042] A transistor for current driving 8, a transistor for ON / OFF control of the transistor for current driving 8, and a vertical electrode and a horizontal electrode, for selecting a display cell that should emit light, are formed on a glass substrate 1. From a power supply pad 22 which is connected to the transistor for current driving 8, a power supply electrode column 21 penetrates to the surface through an insulati...

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PUM

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Abstract

A main object of the present invention is to make it possible to supply current to electric field light emitting elements without decreasing the aperture ratio of pixels. In order to achieve the object, the present invention provides an image displaying device wherein: current driven typed light emitting elements and transistors for current driving are formed on a same substrate; comprising a plurality of display cells having such a structure that the current driven typed light emitting elements and transistors for current driving are connected in between a power supply line and a ground line; the transistors for current driving are selectively driven to conduct display; and a power supply electrode column for supplying currents to each display cell is formed on a power supply common electrode that is formed on a surface of a facing substrate parallel to the substrate.

Description

TECHNICAL FIELD [0001] The present invention relates to an image displaying device using current driven typed light emitting elements such as organic light emitting elements. BACKGROUND ART [0002]FIG. 4 is a diagram showing an example of an image displaying device using organic light emitting elements. FIG. 4A is a sectional view, and FIG. 4B is a top view. [0003] Insulating layers 2 and 3 are laminated on a glass substrate 1, and an anode 4 made of a transparent conductive film which prescribes each light emitting area, is formed thereon. And further, on the entire surface thereof, an organic light emitting layer 5 and a cathode 6 are formed. Moreover on the glass substrate 1, a transistor for current driving 8 which current is supplied via a power supply line 7, a transistor 9 for ON / OFF control of the transistor for current driving 8, and a vertical electrode 10 and a horizontal electrode 11, for selecting display cells to emit light, are formed. The vertical electrode 10 and the...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H01J61/94G09F9/30G09F9/33G09G3/10H01L27/32H05B33/00H05B33/12H05B33/26
CPCH01L27/322H01L51/525H01L27/3276H01L27/3251H10K59/38H10K59/127H10K59/131H10K59/8723H10K50/8428
InventorTANABE, HISAO
OwnerDAI NIPPON PRINTING CO LTD