CONTROL CIRCUIT OF LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC DEVICE INCLUDING LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A control circuit of a liquid crystal display device comprising:
- a display control circuit configured to control a liquid crystal display panel, the liquid crystal display panel configured to display a moving image in a first period and a still image in a second period; and
a power supply circuit electrically connected to the display control circuit, the power supply circuit comprising an operational amplifier comprising;
a differential amplifier circuit;
a current amplifier circuit electrically connected to the differential amplifier circuit; and
a source follower circuit electrically connected to the current amplifier circuit,wherein a current supply capability of the operational amplifier is changeable depending on the amount of current flowing through the current amplifier circuit in the first period and the amount of current flowing through the current amplifier circuit in the second period, andwherein the amount of current flowing through the current amplifier circuit in the first period is different from the amount of current flowing through the current amplifier circuit in the second period.
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Accused Products
Abstract
A current that flows through a common source amplifier circuit provided in a current amplifier circuit of an operational amplifier in displaying a moving image is made to be different from that in displaying a still image. Specifically, in one embodiment of the present invention, current source circuits which are provided in the current amplifier circuit in the operational amplifier operate by switching the current source circuit used for displaying a moving image and the current source circuit used for displaying a still image. The current amplitude in the common source amplifier circuit is controlled by switching the current source circuits, whereby low power consumption in the power supply circuit is achieved. The switching of the current source circuit in the operational amplifier is performed by a display control circuit for controlling a liquid crystal display panel in order to switch moving image display and still image display.
31 Citations
26 Claims
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1. A control circuit of a liquid crystal display device comprising:
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a display control circuit configured to control a liquid crystal display panel, the liquid crystal display panel configured to display a moving image in a first period and a still image in a second period; and a power supply circuit electrically connected to the display control circuit, the power supply circuit comprising an operational amplifier comprising; a differential amplifier circuit; a current amplifier circuit electrically connected to the differential amplifier circuit; and a source follower circuit electrically connected to the current amplifier circuit, wherein a current supply capability of the operational amplifier is changeable depending on the amount of current flowing through the current amplifier circuit in the first period and the amount of current flowing through the current amplifier circuit in the second period, and wherein the amount of current flowing through the current amplifier circuit in the first period is different from the amount of current flowing through the current amplifier circuit in the second period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control circuit of a liquid crystal display device comprising:
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a display control circuit configured to control a liquid crystal display panel, the liquid crystal display panel configured to display a moving image in a first period and a still image in a second period; and a power supply circuit electrically connected to the display control circuit, the power supply circuit comprising an operational amplifier comprising; a differential amplifier circuit; a current amplifier circuit electrically connected to the differential amplifier circuit, the current amplifier circuit comprising; a first current source circuit; and a second current source circuit; and a source follower circuit electrically connected to the current amplifier circuit, wherein a current supply capability of the operational amplifier is changeable depending on the amount of current flowing through the first current source circuit in the first period and the amount of current flowing through the second current source circuit in the second period, and wherein the amount of current flowing through the first current source circuit in the first period is different from the amount of current flowing through the second current source circuit in the second period. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A control circuit of a liquid crystal display device comprising:
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a display control circuit configured to control a liquid crystal display panel, the liquid crystal display panel configured to display a moving image in a first period and a still image in a second period; and a power supply circuit electrically connected to the display control circuit, the power supply circuit comprising an operational amplifier comprising; a differential amplifier circuit; a first transistor; a second transistor; a third transistor; a fourth transistor; and a fifth transistor, wherein a gate of the first transistor is electrically connected to an output terminal of the differential amplifier circuit, wherein one of a source and a drain of the first transistor is electrically connected to a high power supply voltage side terminal, wherein the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor, one of a source and a drain of the third transistor and a gate of the fourth transistor, wherein the other of the source and the drain of the second transistor and the other of the source and the drain of the third transistor is electrically connected to a low power supply voltage side terminal, wherein one of a source and a drain of the fourth transistor is electrically connected to the high power supply voltage side terminal, wherein the other of the source and the drain of the fourth transistor is electrically connected to one of a source and a drain of the fifth transistor, wherein the other of the source and the drain of the fifth transistor is electrically connected to the low power supply voltage side terminal, wherein a current supply capability of the operational amplifier is changeable depending on the amount of current flowing through the second transistor in the first period and the amount of current flowing through the third transistor in the second period, and wherein the amount of current flowing through the second transistor in the first period is different from the amount of current flowing through the third transistor in the second period. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A liquid crystal display device comprising:
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a liquid crystal display panel configured to display a moving image in a first period and a still image in a second period; a display control circuit configured to control the liquid crystal display panel; and a power supply circuit electrically connected to the display control circuit, the power supply circuit comprising an operational amplifier comprising; a differential amplifier circuit; a current amplifier circuit electrically connected to the differential amplifier circuit; and a source follower circuit electrically connected to the current amplifier circuit, wherein a current supply capability of the operational amplifier is changeable depending on the amount of current flowing through the current amplifier circuit in the first period and the amount of current flowing through the current amplifier circuit in the second period, and wherein the amount of current flowing through the current amplifier circuit in the first period is different from the amount of current flowing through the current amplifier circuit in the second period. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification