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Organic electroluminescent display device

Organic electroluminescent display device description/claims

This application is a Continuation of U.S. application Ser. No. 11/704,933 filed on Feb. 12, 2007. Priority is claimed based on U.S. application Ser. No. 11/704,933 filed on Feb. 12, 2007, which claims the priority date of Japanese Patent Application No. 2006-042310 filed on Feb. 20, 2006, all of which is incorporated by reference.

1. Field of the Invention

The present invention relates to an organic EL display device which uses organic EL elements as pixels, and more particularly to an improved power source wiring which supplies electricity allowing the organic EL elements to emit light.

2. Description of the Related Art

An organic EL element is driven by an electric current and hence, it is necessary to eliminate the non-uniformity of the distribution of brightness in a display screen within a panel display region by arranging a bold power source line outside a panel display region thus suppressing a voltage drop of a power source. Accordingly, a size of a so-called picture frame is increased thus interrupting the miniaturization of a profile of a panel.

To achieve the miniaturization of the picture frame, in the above-mentioned patent document 1, there is described an organic EL display device which decreases a line width of the power source line by constituting a power source line which supplies electricity to respective organic EL elements of respective colors (R, G, B), for example, a power source line for the organic EL element B positioned on an outermost side using a first-layer conductive film and a second-layer conductive film.

[Patent document 1] JP-A-2004-62160

In the above-mentioned patent document 1, although the voltage drop is suppressed by stacking two conductive films having small line widths for decreasing the picture frame size, no consideration is taken with respect to the line width of the power source lines for respective colors corresponding to the light emitting efficiencies of the organic EL elements for respective colors.

Accordingly, it is an object of the present invention to provide an organic EL display device which can decide respective line widths of power source lines which supply electricity to organic EL elements of respective colors corresponding to current quantities of the respective power source lines and can decrease a picture frame size thereof.

The present invention is directed to an organic EL display device which includes power source lines which are connected to a plurality of organic EL elements for respective colors and power source lines to which the power source lines are connected (hereinafter referred to as “power source bus lines”), and the power source bus line having a large current quantity is arranged on a side close to a display region for reducing the influence of a voltage drop attributed to the power source line.

Further, the present invention is characterized by increasing a width of the power source bus line with a large current quantity. Further, the power source bus line with a small current quantity is arranged outside the power source bus line with the large current quantity, and the power source line and the contact hole are connected with each other via a connection line made of a high-resistant material which is formed on a lower layer of the power source bus line.

As described above, according to the present invention, the widths of the power source bus lines for respective colors can be optimized within a range that the non-uniformity of the brightness in-plane distribution attributed to a voltage drop does not occur thus realizing the acquisition of an organic EL display device which can reduce a picture frame size while maintaining the display quality.

FIG. 1 is a general appearance view of an organic EL display device according to the present invention;

FIG. 2 is a drive circuit diagram of the organic EL display device shown in FIG. 1;

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