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Display device with threshold correction

a display device and threshold correction technology, applied in static indicating devices, instruments, electroluminescent light sources, etc., can solve the problems of vanishing point, improper light emission, and inability to obtain normal light emission, so as to avoid short-circuit state, remove display defects, and high yield

Inactive Publication Date: 2014-07-31
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a display device that can prevent connection abnormalities between the power source supply line and the power source supply terminal of the drive transistor, which can cause display defects. This is achieved by wiring the power source common connection line separately from the power source supply lines within the pixel circuits. This separation prevents short-circu circuiting that may occur between the power source supply lines and can be easily fixed with a laser beam or the like. The invention results in high yield display devices and improved manufacturing process efficiency.

Problems solved by technology

Therefore, normal light emission may not be obtained unless the power source supply terminal side of the drive transistor is properly connected to the power source supply line.
However, connection abnormality is caused between the power source supply line and the power source supply terminal of the drive transistor due to a trouble in a process for manufacturing a transistor, and as a result, the proper light emission may not be obtained in some cases.
In such cases, no power source voltage is applied to the drive transistor, and as a result, a vanishing point (point defect) is caused.
In addition, a short-circuit caused between the power source line, and a write scanning line, a video signal line or any other electrode member (for example, a source shield) due to interlayer short-circuit or isolayer short-circuit caused by a trouble, in the process for manufacturing a transistor, such as the mistake in the photolithography or the etching, or the dust in some cases.
In the case of short-circuit caused between scanning lines, all the pixels belonging to one transverse line or one longitudinal line in which the short-circuit is caused do not normally emits lights, so that they become a line defect (a vanishing line or a luminescent line).
However, when the same measure technique as that for the measures taken to cope with the short-circuit between the scanning lines is applied to the short-circuit caused between the source shield of the drive transistor, and the power source supply line, it may be impossible to solve the short-circuit caused between the source shield of the drive transistor, and the power source supply line.

Method used

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  • Display device with threshold correction
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Examples

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first embodiment

[0074]FIGS. 4A and 4B to FIG. 7 are respectively a circuit diagram and top plan views explaining a mechanism in a display device according to a first embodiment of the present invention. Here, FIG. 4A is the circuit diagram showing the pixel circuit P, FIG. 4B is the top plan view showing a layout for one pixel of a comparative example with the pixel circuit P shown in FIG. 4A, and FIG. 5 is the top plan view showing a layout for two rows and four columns of the comparative example to which the layout of the comparative example shown in FIG. 4B is applied. Also, FIG. 6 is the top plan view for one pixel in the display device of the first embodiment, and FIG. 7 is the top plan view for two rows and four columns in the pixel circuits in the display device of the first embodiment to which the layout shown in FIG. 6 is applied.

[0075]It is noted that the top plan views showing the respective layouts are the schematic views, including top plan views of other embodiments which will be desc...

second embodiment

[0086]FIG. 8 to FIGS. 14A and 14B are respectively top plan views explaining a mechanism in pixel circuits P in a display device according to a second embodiment of the present invention. Here, FIG. 8 is a top plan view showing a layout for two pixels according to a first example of the second embodiment, and FIG. 9 is a top plan view showing a layout for two rows and four columns according to the first example of the second embodiment to which the layout shown in FIG. 8 is applied. FIG. 10 is a top plan view showing a layout for two pixels according to a second example of the second embodiment, and FIG. 11 is a top plan view showing a layout for two rows and five columns according to the second example of the second embodiment to which the layout shown in FIG. 10 is applied. Also, FIG. 12 is a top plan view showing a layout for two pixels according to a third example of the second embodiment, and FIG. 13 is a top plan view showing a layout for two rows and five columns according to...

third embodiment

[0098]FIGS. 15 to 21 are respectively top plan views explaining a mechanism in pixel circuits P in a display device according to a third embodiment of the present invention. Here, FIG. 15 is a top plan view showing a layout for two pixels according to a first example of the third embodiment, and FIG. 16 is a top plan view showing a layout for two rows and four columns according to the first example of the third embodiment to which the layout shown in FIG. 15 is applied. FIG. 17 is a top plan view showing a layout for two pixels according to a second example of the third embodiment, and FIG. 18 is a top plan view showing a layout for two rows and four columns according to the second example of the third embodiment to which the layout shown in FIG. 17 is applied. Also, FIG. 19 is a top plan view showing a layout for two pixels according to a third example of the third embodiment, and FIG. 20 is a top plan view showing a layout for two rows and four columns according to the third examp...

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Abstract

A display device comprises a first pixel circuit and a second pixel circuit adjacent to the first pixel circuit along a first direction. The first pixel circuit includes a first transistor and a first electro-optic element, and the second pixel circuit includes a second transistor and a second electro-optic element. A power supply line extends along the first direction. A connection wiring is connected between the first transistor and the second transistor, and is connected to the power supply line via a contact portion having at least two contact holes.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]This is a Continuation Application of U.S. patent application Ser. No. 12 / 453,149, filed Apr. 30, 2009, which in turn claims priority from Japanese Application No.: 2008-140310, filed on May 29, 2008, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a display device including a current drive type electro-optic element (referred to as a display element or a light emitting element as well).[0004]2. Description of the Related Art[0005]There is known a display device using a current drive type electro-optic element a luminance of which changes in accordance with a current caused to flow through the current drive type electro-optic element as a display element for a pixel. For example, the current drive type electro-optic element is typified by an Organic Electro-Luminescence (EL) element such as an Organic Light Emitting Diode (O...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L27/32H05B44/00
CPCH01L27/3276G09G3/3233G09G3/3266G09G2300/0439G09G2300/0842G09G2310/0256G09G2330/04H01L2924/0002H10K59/131H01L2924/00
Inventor TANEDA, TAKAYUKIUCHINO, KATSUHIDEIIDA, YUKIHITO
Owner SONY CORP