Display device
First Claim
Patent Images
1. A display device comprising:
- a pixel portion comprising a transistor, a display element, and a capacitor;
a driver circuit configured to drive the pixel portion in a first mode or in a second mode;
a temperature sensing unit configured to sense a temperature;
a first memory device storing a first correction table;
a control circuit comprising;
a D/A converter;
a second memory device storing a second correction table; and
a D/A converter control circuit configured to read a second correction data corresponding to frame frequency from the second correction table and output the second correction data to the D/A converter; and
an image processing circuit configured to read a first correction data corresponding to the temperature from the first correction table and output the first correction data to the control circuit,wherein the transistor comprises an oxide semiconductor layer comprising a channel formation region,wherein one of a source and a drain of the transistor is electrically connected to the display element,wherein a first electrode of the capacitor is electrically connected to the display element,wherein the pixel portion is driven with a first frame frequency during the first mode,wherein the pixel portion is driven with a second frame frequency lower than the first frame frequency during the second mode,wherein a potential output from the D/A converter is applied to a second electrode of the capacitor, andwherein the potential applied to the second electrode of the capacitor is a first potential at a beginning of each frame period and the potential applied to the second electrode of the capacitor gradually rises or drops over time during each frame period.
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Abstract
To provide a novel display device without deterioration of display quality, the display device includes a display panel including a pixel portion that displays still images at a frame frequency of 30 Hz or less, a temperature sensing unit that senses the temperature of the display panel, a memory device that stores a correction table containing correction data, and a control circuit to which correction data selected from the correction table is input in accordance with an output of the temperature sensing unit. The pixel portion includes a plurality of pixels. Each of the pixels includes a transistor, a display element, and a capacitor. The control circuit outputs a voltage based on the correction data input to the control circuit, to the capacitor included in each of the pixels.
174 Citations
10 Claims
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1. A display device comprising:
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a pixel portion comprising a transistor, a display element, and a capacitor; a driver circuit configured to drive the pixel portion in a first mode or in a second mode; a temperature sensing unit configured to sense a temperature; a first memory device storing a first correction table; a control circuit comprising; a D/A converter; a second memory device storing a second correction table; and a D/A converter control circuit configured to read a second correction data corresponding to frame frequency from the second correction table and output the second correction data to the D/A converter; and an image processing circuit configured to read a first correction data corresponding to the temperature from the first correction table and output the first correction data to the control circuit, wherein the transistor comprises an oxide semiconductor layer comprising a channel formation region, wherein one of a source and a drain of the transistor is electrically connected to the display element, wherein a first electrode of the capacitor is electrically connected to the display element, wherein the pixel portion is driven with a first frame frequency during the first mode, wherein the pixel portion is driven with a second frame frequency lower than the first frame frequency during the second mode, wherein a potential output from the D/A converter is applied to a second electrode of the capacitor, and wherein the potential applied to the second electrode of the capacitor is a first potential at a beginning of each frame period and the potential applied to the second electrode of the capacitor gradually rises or drops over time during each frame period. - View Dependent Claims (2, 3, 4)
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5. A display device comprising:
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a pixel portion comprising a transistor, a display element, and a capacitor; a driver circuit configured to drive the pixel portion in a first mode or in a second mode; a temperature sensing unit configured to sense a temperature; a first memory device storing a first correction table; a control circuit comprising; a D/A converter; a second memory device storing a second correction table; and a D/A converter control circuit configured to read a second correction data corresponding to frame frequency from the second correction table and output the second correction data to the D/A converter; and an image processing circuit configured to read a first correction data corresponding to the temperature from the first correction table and output the first correction data to the control circuit, wherein the transistor comprises an oxide semiconductor layer comprising a channel formation region, wherein one of a source and a drain of the transistor is electrically connected to the display element, wherein a first electrode of the capacitor is electrically connected to the display element, wherein the pixel portion is driven with a first frame frequency during the first mode, wherein the pixel portion is driven with a second frame frequency lower than the first frame frequency during the second mode, and wherein a potential output from the D/A converter is applied to a second electrode of the capacitor. - View Dependent Claims (6, 7, 8)
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9. A display device comprising:
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a pixel portion comprising a transistor, a display element, and a capacitor; a temperature sensing unit configured to sense a temperature; a first memory device storing a first correction table; a control circuit comprising; a D/A converter; a second memory device storing a second correction table; and a D/A converter control circuit configured to read a second correction data corresponding to frame frequency from the second correction table and output the second correction data to the D/A converter; and an image processing circuit configured to read a first correction data corresponding to the temperature from the first correction table and output the first correction data to the control circuit, wherein the transistor comprises an oxide semiconductor layer comprising a channel formation region, wherein one of a source and a drain of the transistor is electrically connected to the display element, wherein a first electrode of the capacitor is electrically connected to the display element, and wherein a potential output from the D/A converter is applied to a second electrode of the capacitor. - View Dependent Claims (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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InventorsKoyama, Jun, Miyake, Hiroyuki
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Primary Examiner(s)Xavier, Antonio
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Application NumberUS14/086,290Publication NumberTime in Patent Office1,440 DaysField of SearchNoneUS Class CurrentCPC Class CodesG09G 2320/041 Temperature compensationG09G 2320/103 Detection of image changes,...G09G 2340/0435 Change or adaptation of the...G09G 3/3648 using an active matrix G09G...G09G 3/3655 Details of drivers for coun...G09G 3/3696 Generation of voltages supp...
