Liquid crystal display device, portable electronic device and driving method thereof
First Claim
Patent Images
1. An electronic device comprising:
- a display having a memory effect, the display adapted to maintain an image thereon without receiving electric power;
a driving circuit adapted to perform image writing on the display;
a data processing unit which is connected to the driving circuit, the data processing unit including at least one central processing unit adapted to operate in a sleep state during which part of an internal circuit is inactivated after completion of image writing;
a power supply circuit adapted to supply electric power to the driving circuit, the power supply circuit including one element selected from the group consisting of a booster circuit and a DC/DC converter;
a data reader including a slot adapted to receive a data storage medium, the data reader adapted to read data stored on a received data storage medium;
an operation section adapted to receive an input from a user; and
a controller adapted to inactivate at least one part of the power supply circuit after completion of image writing, the controller adapted to reactivate the inactivated at least one part of the power supply circuit upon receiving an input from the operation section;
wherein the at least one central processing unit changes from the sleep state to an active state and the data reader reads data from a data storage medium received in the data reader when the controller receives an input from the operation section,wherein the controller reactivates the inactivated at least one part of the power supply circuit after the data reader reads data from a data storage medium,wherein the driving circuit performs image writing on the display after the inactivated at least one part of the power supply circuit is reactivated, andwherein the controller inactivates the at least one part of the power supply circuit after completion of image writing, the at least one central processing unit subsequently changes to the sleep state, and the display maintains an image thereon without receiving electric power.
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Abstract
A display device which is provided with a liquid crystal display which uses reflective type liquid crystal with a memory effect. This display device is used, for example, as a sub display of a personal computer. The liquid crystal display keeps displaying an image after supply of electric power thereto is stopped. When a specified time has passed since completion of writing, supply of electric power at least to a driving section of the liquid crystal display is stopped.
53 Citations
20 Claims
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1. An electronic device comprising:
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a display having a memory effect, the display adapted to maintain an image thereon without receiving electric power; a driving circuit adapted to perform image writing on the display; a data processing unit which is connected to the driving circuit, the data processing unit including at least one central processing unit adapted to operate in a sleep state during which part of an internal circuit is inactivated after completion of image writing; a power supply circuit adapted to supply electric power to the driving circuit, the power supply circuit including one element selected from the group consisting of a booster circuit and a DC/DC converter; a data reader including a slot adapted to receive a data storage medium, the data reader adapted to read data stored on a received data storage medium; an operation section adapted to receive an input from a user; and a controller adapted to inactivate at least one part of the power supply circuit after completion of image writing, the controller adapted to reactivate the inactivated at least one part of the power supply circuit upon receiving an input from the operation section; wherein the at least one central processing unit changes from the sleep state to an active state and the data reader reads data from a data storage medium received in the data reader when the controller receives an input from the operation section, wherein the controller reactivates the inactivated at least one part of the power supply circuit after the data reader reads data from a data storage medium, wherein the driving circuit performs image writing on the display after the inactivated at least one part of the power supply circuit is reactivated, and wherein the controller inactivates the at least one part of the power supply circuit after completion of image writing, the at least one central processing unit subsequently changes to the sleep state, and the display maintains an image thereon without receiving electric power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic device comprising:
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a display having a memory effect, the display adapted to maintain an image thereon without receiving electric power; a driving circuit adapted to perform image writing on the display; a data processing unit which is connected to the driving circuit, the data processing unit including at least one central processing unit adapted to operate in a sleep state during which part of an internal circuit is inactivated after completion of image writing; a power supply circuit adapted to supply electric power to the driving circuit, the power supply circuit including one element selected from the group consisting of a booster circuit and a DC/DC converter; a data reader including a slot adapted to receive a data storage medium, the data reader adapted to read data stored on a received data storage medium; an operation section adapted to receive an input from a user; and a controller adapted to inactivate at least one part of the power supply circuit after completion of image writing, the controller adapted to reactivate the inactivated at least one part of the power supply circuit upon receiving an input from the operation section; wherein the at least one central processing unit changes from the sleep state to an active state when the controller receives an input from the operation section, wherein the data reader reads data from a data storage medium installed in the data reader and the driving circuit performs image writing on the display after the at least one central processing unit changes to the active state, wherein the controller reactivates the inactivated at least one part of the power supply circuit before image writing and inactivates the at least one part of the power supply circuit after completion of image writing, and wherein data reading and image writing are not performed simultaneously. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for operating a display apparatus comprising:
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receiving a user input; changing a processor from a sleep state to an active state when the processor receives a user input; reading data from a data storage medium after changing the processor to the active state; activating at least one portion of a power supply circuit after reading data from a data storage medium; writing an image on a display portion of the display apparatus; inactivating the at least one portion of the power supply circuit after writing an image on the display portion; and changing the processor from the active state to the sleep state after inactivating the at least one portion of the power supply circuit, wherein the display portion maintains an image thereon without receiving electric power. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification