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US 2010/0141640 A1Published application
Display device and aging method
AssigneesHitachi Displays, Ltd., Cannon Kabushiki Kaisha
InventorMasamitsu FURUIE
Life of this patent
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Abstract
The display device according to the present invention is provided with a thin film transistor (first transistor) for aging which directly connects an organic EL element to a power supply line, and furthermore, an aging control line and a thin film transistor (second transistor) for switching aging control signals are provided in order to control the thin film transistor for aging, and thus the aging period is shorter.
Claims13
A display device, comprising:
- a number of pixels;
- a drive circuit for supplying a video voltage to each pixel;
- and
- an aging control line, wherein
- each pixel has a light emitting element;
- a drive transistor for driving said light emitting element of which the first electrode is connected to a power supply line;
- and a first transistor that is connected between said power supply line and said light emitting element so that the gate electrode of said first transistor is connected to said aging control line, wherein
- a drive voltage for turning on said first transistor is supplied to said aging control line during aging, and thus a current is supplied to said light emitting element via said first transistor.
5 more elements
An aging method for a display device comprising:
- a number of pixels;
- a drive circuit for supplying a video voltage to each pixel;
- an aging control line;
- a second transistor of which the first electrode is connected to said aging control line;
- and
- an aging control switching signal line that is connected to the gate electrode of said second transistor, wherein
- each pixel has a light emitting element;
- a drive transistor for driving said light emitting element of which the first electrode is connected to a power supply line;
- and a first transistor that is connected between said power supply line and said light emitting element, and
- the gate electrode of said first transistor is connected to said aging control line, wherein
- a drive voltage for turning on said second transistor is supplied to said aging control switching signal line and a drive voltage for turning on said first transistor is supplied to the second electrode of said second transistor during aging so that a drive voltage for turning on said first transistor is supplied to said aging control line via said second transistor, and thus, a current is supplied to said light emitting element via said first transistor.
8 more elements
An aging method for display cells, wherein
- a number of display cells are formed on a mother substrate,
- each display cell comprises a number of pixels;
- a drive circuit for supplying a video voltage to each pixel;
- an aging control line;
- a second transistor of which the first electrode is connected to said aging control line;
- and an aging control switching signal line that is connected to the gate electrode of said second transistor,
- each pixel has a light emitting element;
- a drive transistor for driving said light emitting element of which the first electrode is connected to a power supply line;
- and a first transistor that is connected between said power supply line and said light emitting element, and the gate electrode of said first transistor is connected to said aging control line, wherein
- said aging control switching signal line of said display cell, the second electrode of said second transistor and said power supply line are connected to terminals formed on said mother substrate, and
- a drive voltage for turning on said second transistor is supplied to the terminal on said mother substrate connected to said aging control switching signal line of said display cell, a drive voltage for turning on said first transistor is supplied to the terminal on said mother substrate connected to the second electrode of said second transistor of said display cell, and a power supply voltage is supplied to the terminal on said mother substrate connected to said power supply line of said display cell.
8 more elements
Dependencies are inferred from the claim text.