DISPLAY DEVICE AND ELECTRONIC APPARATUS
First Claim
1. A display device comprising:
- a display;
a display controller; and
a light sensor, wherein the display device has a first display mode and a second display mode, wherein in the first display mode, one frame period is divided into a plurality of subframe periods, each of the plurality of subframe periods is either a lighting period or a non-lighting period, and an n-bit (where n is a natural number equal to or more than
2) gray scale is expressed by the sum total of a lighting time within the one frame period, wherein in the second display mode, the display is operated by a lower clock frequency and a lower driving voltage than in the first display mode, one frame period is either a lighting period or a non-lighting period, and a one-bit gray scale is expressed by the sum total of a lighting time within the one frame period, wherein outside light is received by the light sensor, and the first display mode and the second display mode are controlled by the display controller in accordance with intensity of the outside light, and wherein a plurality of gate signal lines are selected within one gate selection period by dividing one gate selection period into a plurality of sub-gate selection periods and selecting a gate signal line of one row within the sub-gate selection period.
1 Assignment
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Accused Products
Abstract
Outside light is received using a light sensor, and in accordance with the outside light intensity, each of a first display mode which expresses multiple gray scales and a second display-y mode which expresses a gray scale smaller in number than that in the first display mode is switched and used. The switching is controlled by a display controller based on data of the outside light intensity. Accordingly, the visibility can be ensured in a wide range of situations, from under a fluorescent lamp in a dark place or inside, to under sunlight outside. In the second display mode, frequencies of a start pulse and a clock pulse to be inputted to a source signal line driver circuit are reduced and a driving voltage is decreased by the display controller; accordingly, a frame period can be longer than that in the first display mode and power consumption can be reduced.
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Citations
27 Claims
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1. A display device comprising:
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a display;
a display controller; and
a light sensor, wherein the display device has a first display mode and a second display mode, wherein in the first display mode, one frame period is divided into a plurality of subframe periods, each of the plurality of subframe periods is either a lighting period or a non-lighting period, and an n-bit (where n is a natural number equal to or more than
2) gray scale is expressed by the sum total of a lighting time within the one frame period,wherein in the second display mode, the display is operated by a lower clock frequency and a lower driving voltage than in the first display mode, one frame period is either a lighting period or a non-lighting period, and a one-bit gray scale is expressed by the sum total of a lighting time within the one frame period, wherein outside light is received by the light sensor, and the first display mode and the second display mode are controlled by the display controller in accordance with intensity of the outside light, and wherein a plurality of gate signal lines are selected within one gate selection period by dividing one gate selection period into a plurality of sub-gate selection periods and selecting a gate signal line of one row within the sub-gate selection period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display device comprising:
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a display;
a display controller; and
a light sensor, wherein the display device has a first display mode and a second display mode, wherein in the first display mode, one frame period is divided into a plurality of subframe periods, each of the plurality of subframe periods is either a lighting period or a non-lighting period, and an n-bit (where n is a natural number equal to or more than
2) gray scale is expressed by the sum total of a lighting time within the one frame period,wherein in the second display mode, the display is operated by a lower clock frequency and a lower driving voltage than in the first display mode, one frame period longer than one frame period in the first display mode is either a lighting period or a non-lighting period, and a one-bit gray scale is expressed by a lighting time within the one frame period are included, wherein outside light is received by the light sensor, and the first display mode and the second display mode are controlled by the display controller in accordance with intensity of the outside light, and wherein a plurality of gate signal lines are selected within one gate selection period by dividing one gate selection period into a plurality of sub-gate selection periods and selecting a gate signal line of one row within the sub-gate selection period. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A display device comprising:
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a display;
a display controller; and
a light sensor, wherein the display device has a first display mode and a second display mode, wherein in the first display mode, one frame period is divided into a plurality of subframe periods, each of the plurality of subframe periods is either a lighting period or a non-lighting period, and an n-bit (where n is a natural number equal to or more than
2) gray scale is expressed by the sum total of a lighting time within the one frame period,wherein in the second display mode, the display is operated by a lower clock frequency and a lower driving voltage than in the first display mode, one frame period is divided into a plurality of subframe periods, each of the plurality of subframe periods is either a lighting period or a non-lighting period, and an m-bit (where m is a natural number less than n) gray scale is expressed by the sum total of a lighting time within the one frame period are included, wherein outside light is received by the light sensor, and the first display mode and the second display mode are controlled by the display controller in accordance with intensity of the outside light; and
wherein a plurality of gate signal lines are selected within one gate selection period by dividing one gate selection period into a plurality of sub-gate selection periods and selecting a gate signal line of one row within the sub-gate selection period. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A driving method of a display device comprising a display and a light sensor, the method comprising:
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selecting a display mode between a first display mode and a second display mode in accordance with intensity of an outside light received by the light sensor;
in the selected display mode, selecting a plurality of gate signal lines within one gate selection period by dividing one gate selection period into a plurality of sub-gate selection periods and selecting a gate signal line of one row within the sub-gate selection period, wherein in the first display mode, one frame period is divided into a plurality of subframe periods, each of the plurality of subframe periods is either a lighting period or a non-lighting period, and an n-bit (where n is a natural number equal to or more than
2) gray scale is expressed by the sum total of a lighting time within the one frame period, andwherein in the second display mode, the display is operated by a lower clock frequency and a lower driving voltage than in the first display mode, one frame period is either a lighting period or a non-lighting period, and a one-bit gray scale is expressed by a lighting time within the one frame period. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification