LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A method for driving a liquid crystal display device comprising a plurality of pixels in a display portion and configured to perform display in a plurality of frame periods,wherein each of the plurality of frame periods includes a writing period and a holding period,wherein after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period,wherein the transistor comprises a semiconductor layer including an oxide semiconductor, andwherein a concentration of hydrogen in the oxide semiconductor, which is measured by secondary ion mass spectrometry, is 5×
- 1019/cm3 or less.
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Accused Products
Abstract
In a liquid crystal display device including a plurality of pixels in a display portion and configured to performed display in a plurality of frame periods, each of the frame periods includes a writing period and a holding period, and after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period. The pixel includes a semiconductor layer including an oxide semiconductor layer, and the oxide semiconductor layer has a carrier concentration of less than 1×1014/cm3.
212 Citations
16 Claims
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1. A method for driving a liquid crystal display device comprising a plurality of pixels in a display portion and configured to perform display in a plurality of frame periods,
wherein each of the plurality of frame periods includes a writing period and a holding period, wherein after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period, wherein the transistor comprises a semiconductor layer including an oxide semiconductor, and wherein a concentration of hydrogen in the oxide semiconductor, which is measured by secondary ion mass spectrometry, is 5× - 1019/cm3 or less.
- View Dependent Claims (2, 3, 4, 5)
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6. A method for driving a liquid crystal display device comprising a plurality of pixels in a display portion and configured to perform display in a plurality of frame periods,
wherein each of the plurality of frame periods includes a writing period and a holding period, and wherein after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period.
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11. A method for driving a liquid crystal display device comprising a plurality of pixels in a display portion and configured to perform display in a plurality of frame periods,
wherein each of the plurality of frame periods includes a writing period and a holding period, and wherein after an image signal with a voltage whose polarity is inverted a plurality of times is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period.
Specification