Display device, display module including the display device, and electronic device including the display device or the display module
First Claim
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1. A display device comprising:
- a pixel comprising;
a transistor comprising an oxide semiconductor in a channel thereof;
a pixel electrode electrically connected to the transistor; and
a liquid crystal layer over the pixel electrode; and
a driver circuit for outputting a signal to the pixel,wherein;
the liquid crystal layer comprises a liquid crystal mixture formed only of materials having a dipole moment of 3 debye or less,the liquid crystal layer has a resistivity of 1.0×
1014 (Ω
·
cm) or more,the driver circuit is configured to switch a first mode in which the signal for a moving image is output to the pixel at a frequency of 30 Hz or more, and a second mode in which the signal for a still image is output to the pixel at a frequency of 1 Hz or less, andthe pixel is configured to display the still image at a frame frequency of 1/30 Hz to 1 Hz.
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Abstract
Provided is a novel display device without deterioration of display quality or a novel display device in which flickering due to a reduced refresh rate is suppressed. The display device includes a pixel for displaying a still image at a frame frequency of less than or equal to 1 Hz. The pixel includes a liquid crystal layer. The liquid crystal layer includes a molecule whose dipole moment is greater than or equal to 0 debye and less than or equal to 3 debye. Thus, flickering due to a reduced refresh rate can be suppressed, which leads to an improvement in display quality.
67 Citations
10 Claims
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1. A display device comprising:
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a pixel comprising; a transistor comprising an oxide semiconductor in a channel thereof; a pixel electrode electrically connected to the transistor; and a liquid crystal layer over the pixel electrode; and a driver circuit for outputting a signal to the pixel, wherein; the liquid crystal layer comprises a liquid crystal mixture formed only of materials having a dipole moment of 3 debye or less, the liquid crystal layer has a resistivity of 1.0×
1014 (Ω
·
cm) or more,the driver circuit is configured to switch a first mode in which the signal for a moving image is output to the pixel at a frequency of 30 Hz or more, and a second mode in which the signal for a still image is output to the pixel at a frequency of 1 Hz or less, and the pixel is configured to display the still image at a frame frequency of 1/30 Hz to 1 Hz. - View Dependent Claims (2, 3, 4, 5)
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6. A display device comprising:
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a pixel comprising; a transistor comprising an oxide semiconductor in a channel thereof; a reflective electrode electrically connected to the transistor; and a liquid crystal layer over the reflective electrode; and a driver circuit for outputting a signal to the pixel, wherein; the reflective electrode has a projection and a depression, the liquid crystal layer comprises a liquid crystal mixture formed only of materials having a dipole moment of 3 debye or less, the liquid crystal layer has a resistivity of 1.0×
1014 (Ω
·
cm) or more,the driver circuit is configured to switch a first mode in which the signal for a moving image is output to the pixel at a frequency of 30 Hz or more, and a second mode in which the signal for a still image is output to the pixel at a frequency of 1 Hz or less, and the pixel is configured to display the still image at a frame frequency of 1/30 Hz to 1 Hz. - View Dependent Claims (7, 8, 9, 10)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsNiikura, Yasuhiro, Ikenaga, Makoto, Kubota, Daisuke, Hatsumi, Ryo
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Primary Examiner(s)Balaoing, Ariel A
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Application NumberUS15/529,363Publication NumberTime in Patent Office1,685 DaysField of SearchUS Class CurrentCPC Class CodesC09K 19/02 characterised by optical, e...G02F 1/139 based on orientation effect...G02F 1/1396 the liquid crystal being se...G09G 3/34 by control of light from an...
