DISPLAY DEVICE
First Claim
Patent Images
1. A display device provided with a display panel comprising:
- a pixel portion comprising a pixel, wherein the pixel comprises a liquid crystal display element and a transistor; and
a driver circuit portion configured to drive the pixel portion and display an image on a screen,wherein the driver circuit portion has a function to write a first image signal and a second image signal to the pixel successively so as to display an image on the screen, and a function to stop a writing operation of the second image signal and turn the transistor off so as to maintain one image written to the screen when a difference is not detected between the first image signal and the second image signal, andwherein an off current of the transistor is lower than 10 zA/μ
m at room temperature and lower than 100 zA/μ
m at 85°
C.
1 Assignment
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Accused Products
Abstract
A driver circuit portion of a display device has a function in which image signals are written to a selected pixel successively so as to display an image on a screen and a function in which writing operation of an image signal is stopped and a transistor is turned off so as to maintain one image written to the screen when the one image is continuously displayed on the screen. Such functions are achieved by a transistor whose off current per micrometer in channel width is reduced to an extremely low value that is lower than 10 zA/μm at room temperature and lower than 100 zA/μm at 85° C.
137 Citations
32 Claims
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1. A display device provided with a display panel comprising:
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a pixel portion comprising a pixel, wherein the pixel comprises a liquid crystal display element and a transistor; and a driver circuit portion configured to drive the pixel portion and display an image on a screen, wherein the driver circuit portion has a function to write a first image signal and a second image signal to the pixel successively so as to display an image on the screen, and a function to stop a writing operation of the second image signal and turn the transistor off so as to maintain one image written to the screen when a difference is not detected between the first image signal and the second image signal, and wherein an off current of the transistor is lower than 10 zA/μ
m at room temperature and lower than 100 zA/μ
m at 85°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A display device provided with a display panel comprising:
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a pixel portion comprising a pixel, wherein the pixel comprises a liquid crystal display element and a transistor; and a driver circuit portion configured to drive the pixel portion and display an image on a screen, wherein the driver circuit portion has a function to select a first operation mode and a second operation mode, wherein the first operation mode is to perform a writing operation by writing a first image signal and a second image signal to the pixel successively so as to display an image on the screen, and wherein the second operation mode is to stop a writing operation so as to maintain one image written to the screen when the a difference is not detected between the first image signal and the second image signal, and wherein an off current of the transistor is lower than 10 zA/μ
m at room temperature and lower than 100 zA/μ
m at 85°
C. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A display device provided with a display panel comprising:
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a pixel portion comprising a pixel, wherein the pixel comprises a liquid crystal display element and a transistor; and a driver circuit portion configured to drive the pixel portion and display an image on a screen, wherein the driver circuit portion has a function to write a first image signal and a second image signal to the pixel successively so as to display an image on the screen, and a function to stop a writing operation of the second image signal and turn the transistor off so as to maintain one image written to the screen when a difference is not detected between the first image signal and the second image signal, wherein an off current of the transistor is lower than 10 zA/μ
m at room temperature and lower than 100 zA/μ
m at 85°
C., andwherein a source electrode and a drain electrode of the transistor comprise metal nitride. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A display device provided with a display panel comprising:
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a pixel portion comprising a pixel, wherein the pixel comprises a liquid crystal display element and a transistor; and a driver circuit portion configured to drive the pixel portion and display an image on a screen, wherein the driver circuit portion has a function to select a first operation mode and a second operation mode, wherein the first operation mode is to perform a writing operation by writing a first image signal and a second image signal to the pixel successively so as to display an image on the screen, and wherein the second operation mode is to stop a writing operation so as to maintain one image written to the screen when the a difference is not detected between the first image signal and the second image signal, wherein an off current of the transistor is lower than 10 zA/μ
m at room temperature and lower than 100 zA/μ
m at 85°
C., andwherein a source electrode and a drain electrode of the transistor comprise metal nitride. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification