Pixel circuit and display panel
US-2024428730-A1 · Dec 26, 2024 · US
Driving method of light emitting device and light emitting device
US8937580B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8937580-B2 |
| Application number | US-90281104-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 2, 2004 |
| Priority date | Aug 8, 2003 |
| Publication date | Jan 20, 2015 |
| Grant date | Jan 20, 2015 |
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Abstract
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A driving method of a light emitting device, in which when an N-type driving TFT is connected to an anode of a light emitting element or a P-type driving TFT is connected to a cathode thereof, the driving TFT operates in a saturation region and an image can be displayed with a desired gray scale level depending on a video signal. In addition, a light emitting device adopting the driving method is provided. According to the invention, when a potential having image data is supplied to a gate of a driving TFT depending on a video signal, a reverse bias voltage is applied to the driving TFT and a light emitting element which are connected in series with each other. Meanwhile, when a pixel displays an image depending on the video signal, a forward bias voltage is applied to the driving TFT and the light emitting element.
First claim
Opening claim text (preview).
What is claimed is: 1. A light emitting device comprising a light emitting element, first to third TFTs, and a power supply line, wherein the first to the third TFTs are N-type TFTs; one of a source and a drain of the first TFT is directly connected to a gate of the second TFT and a first one of two electrodes of a capacitor; one of a source and a drain of the second TFT is connected to the power supply line and the other of the source and the drain of the second TFT is direct…
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Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
- G09G3/3233Primary
Physics · mapped topic
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Frequently asked questions
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- What does patent US8937580B2 cover?
- A driving method of a light emitting device, in which when an N-type driving TFT is connected to an anode of a light emitting element or a P-type driving TFT is connected to a cathode thereof, the driving TFT operates in a saturation region and an image can be displayed with a desired gray scale level depending on a video signal. In addition, a light emitting device adopting the driving method …
- Who is the assignee on this patent?
- Miyagawa Keisuke, Semiconductor Energy Lab
- What technology area does this patent fall under?
- Primary CPC classification G09G3/3233. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 20 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).