Method for driving liquid crystal display device
First Claim
Patent Images
1. A driving method of a display device, the display device comprising:
- a display panel comprising a pixel circuit portion and a gate line driver circuit, the pixel circuit portion comprising a pixel electrode and a transistor electrically connected to the pixel electrode, wherein the transistor comprises an oxide semiconductor layer including a channel formation region, and wherein the oxide semiconductor layer comprises indium and zinc;
the driving method comprising;
displaying a moving image in a first period at a first refresh rate; and
displaying a still image in a second period at a second refresh rate which is smaller than the first refresh rate,wherein supply of a start pulse signal to the gate line driver circuit is stopped in a period during which the moving image is switched to the still image, andwherein an off current per micrometer in a channel width of the transistor is less than or equal to 1×
10−
17 A/μ
m.
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Abstract
The liquid crystal display device includes a first substrate provided with a terminal portion, a switching transistor, a driver circuit portion, and a pixel circuit portion including a pixel transistor and a plurality of pixels, a second substrate provided with a common electrode electrically connected to the terminal portion through the switching transistor, and liquid crystal between a pixel electrode and the common electrode. In a period during which a still image is switched to a moving image, the following steps are sequentially performed: a first step of supplying the common potential to the common electrode; a second step of supplying a power supply voltage to the driver circuit portion; a third step of supplying a clock signal to the driver circuit portion; and a fourth step of supplying a start pulse signal to the driver circuit portion.
170 Citations
22 Claims
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1. A driving method of a display device, the display device comprising:
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a display panel comprising a pixel circuit portion and a gate line driver circuit, the pixel circuit portion comprising a pixel electrode and a transistor electrically connected to the pixel electrode, wherein the transistor comprises an oxide semiconductor layer including a channel formation region, and wherein the oxide semiconductor layer comprises indium and zinc; the driving method comprising; displaying a moving image in a first period at a first refresh rate; and displaying a still image in a second period at a second refresh rate which is smaller than the first refresh rate, wherein supply of a start pulse signal to the gate line driver circuit is stopped in a period during which the moving image is switched to the still image, and wherein an off current per micrometer in a channel width of the transistor is less than or equal to 1×
10−
17 A/μ
m. - View Dependent Claims (2, 3, 4, 5)
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6. A driving method of a display device, the display device comprising:
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a display panel comprising a pixel circuit portion and a gate line driver circuit, the driving method comprising; displaying a moving image in a first period at a first refresh rate; and displaying a still image in a second period at a second refresh rate which is smaller than the first refresh rate, wherein supply of a start pulse signal to the gate line driver circuit is stopped in a period during which the moving image is switched to the still image, wherein the pixel circuit portion comprises a pixel electrode and a first transistor electrically connected to the pixel electrode, the first transistor comprising a first oxide semiconductor layer including a channel formation region over a substrate, wherein the gate line driver circuit comprises a second transistor, the second transistor comprising a second oxide semiconductor layer including a channel formation region over the substrate, and wherein an off current per micrometer in a channel width of the first transistor is less than or equal to 1×
10−
17 A/μ
m. - View Dependent Claims (7, 8, 9, 10)
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11. A driving method of a display device, the display device comprising:
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a display panel comprising a pixel circuit portion and a gate line driver circuit, the driving method comprising; displaying a moving image in a first period at a first refresh rate; and displaying a still image in a second period at a second refresh rate which is smaller than the first refresh rate, wherein supply of a start pulse signal to the gate line driver circuit is stopped in a period during which the moving image is switched to the still image, wherein the pixel circuit portion comprises a pixel electrode and a first transistor electrically connected to the pixel electrode, the first transistor comprising a first oxide semiconductor layer including a channel formation region over a first gate electrode layer, wherein the gate line driver circuit comprises a second transistor, the second transistor comprising a second gate electrode layer, a second oxide semiconductor layer including a channel formation region over the second gate electrode layer, and a conductive layer overlapping with the second oxide semiconductor layer, wherein the conductive layer is at a same potential as the second gate electrode layer, wherein the conductive layer is on a same surface as the pixel electrode, and wherein an off current per micrometer in a channel width of the first transistor is less than or equal to 1×
10−
17 A/μ
m. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A driving method of a display device, the display device comprising:
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a display panel comprising a pixel circuit portion and a gate line driver circuit, the pixel circuit portion comprising a pixel electrode and a transistor electrically connected to the pixel electrode, wherein the transistor comprises an oxide semiconductor layer including a channel formation region, wherein the oxide semiconductor layer comprises indium, gallium, and zinc, and wherein the oxide semiconductor layer is an intrinsic or substantially intrinsic; the driving method comprising; displaying a moving image in a first period at a first refresh rate; and displaying a still image in a second period at a second refresh rate which is smaller than the first refresh rate, wherein supply of a start pulse signal to the gate line driver circuit is stopped in a period during which the moving image is switched to the still image, and wherein an off current per micrometer in a channel width of the transistor is less than or equal to 1×
10−
17 A/μ
m. - View Dependent Claims (18, 19, 20, 21, 22)
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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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InventorsKoyama, Jun, Miyake, Hiroyuki
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Primary Examiner(s)Zhou, Hong
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Application NumberUS15/007,999Publication NumberTime in Patent Office755 DaysField of Search345 87-100, 345204-211, 345173-174, 257 43, 257 59US Class CurrentCPC Class CodesG02F 1/1345 Conductors connecting elect...G06F 3/0421 by interrupting or reflecti...G06F 3/044 by capacitive meansG09G 2300/0809 Several active elements per...G09G 2310/04 Partial updating of the dis...G09G 2310/061 for resetting or blankingG09G 2310/08 Details of timing specific ...G09G 2320/0209 Crosstalk reduction, i.e. t...G09G 2320/0219 Reducing feedthrough effect...G09G 2320/10 Special adaptations of disp...G09G 2320/103 Detection of image changes,...G09G 2330/021 Power management, e.g. powe...G09G 2340/0435 Change or adaptation of the...G09G 2340/16 Determination of a pixel da...G09G 2354/00 Aspects of interface with d...G09G 3/3618 with automatic refresh of t...G09G 3/3648 using an active matrix G09G...G09G 3/3655 Details of drivers for coun...G09G 3/3696 Generation of voltages supp...
