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US 8,786,353 B2Granted
Multi-channel semiconductor device and display device comprising same
AssigneeSamsung Electronics Co., Ltd.
InventorsJae-wook Kwon, Chang-ho An, Ki-won Seo, Sung-ho Lee
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Abstract
A multi-channel semiconductor device comprises a plurality of buffer groups each comprising at least one output buffer, a plurality of pad groups each comprising at least one output pad, and a channel switching portion that controls connection between the plurality of buffer groups and the plurality of pad groups. One of the pad groups outputs an output signal of one of the buffer groups in a first operation mode and sequentially outputs output signals of all of the buffer groups in a second operation mode.
Claims9
A multi-channel semiconductor device comprising:
- a plurality of buffer groups each comprising at least one output buffer;
- a plurality of pad groups each comprising at least one output pad;
- and
- a channel switching portion that controls connection between the plurality of buffer groups and the plurality of pad groups,
- wherein one of the plurality of pad groups outputs an output signal of one of the buffer groups in a first operation mode and sequentially outputs output signals of all of the buffer groups in a second operation mode;
- wherein the channel switching portion comprises:
- a plurality of output switching portions that control connection between at least one output terminal of a corresponding buffer group and at least one output pad of a corresponding pad group;
- and
- a plurality of shift switching portions that control connection between at least one output pad of a corresponding pad group and at least one common node of a plurality of common nodes,
- wherein one of the shift switching portions, while turned on in the second operation mode, transmits signals from the common nodes to a plurality of output pads of a corresponding pad group, and each of the other shift switching portions among the plurality of shift switching portions, while turned on in the second operation mode, transmits a plurality of output signals of a corresponding buffer group to the plurality of common nodes,
- wherein, in the second operation mode, one of the plurality of output switching portions turns on at a different time from the other shift switching portions;
- wherein, in the second operation mode, the one output switching portion and the other shift switching portions are sequentially turned on during a predetermined time, and
- wherein the one output switching portion is in an ON state during at least a period in which the other shift switching portions are sequentially turned on.
10 more elements
A multi-channel semiconductor device comprising a plurality of output channels, wherein each of the plurality of output channels comprises:
- an output pad;
- an output buffer that generates an output signal;
- a first switch that controls connection between the output buffer and the output pad;
- and
- a second switch that controls connection between the output pad and a corresponding common node of N common nodes,
- wherein the plurality of output channels are divided into a plurality of groups each comprising at least one output channel, and an output pad of one group among the plurality of groups sequentially outputs output signals of the plurality of groups in a test mode of the multi-channel semiconductor device;
- wherein, in the test mode, second switches of other groups among the plurality of groups are sequentially turned on in response to shift pulses sequentially activated, respectively;
- wherein each of the second switches of the one group is in an ON state during at least a period in which the second switches of the other groups are sequentially turned on.
5 more elements
A display device, comprising:
- a display panel;
- and
- a display driver integrated circuit, comprising:
- a plurality of buffer groups each comprising a plurality of output buffers;
- a plurality of pad groups each comprising at least one output pad configured to transmit image data to the display panel;
- and
- a channel switching portion that controls connection between the plurality of buffer groups and the plurality of pad groups,
- wherein one of the plurality of pad groups outputs output signals of one of the buffer groups in a first operation mode and sequentially outputs output signals of all of the buffer groups in a second operation mode;
- wherein the channel switching portion comprises:
- a plurality of output switching portions that control connection between at least one output terminal of a corresponding buffer group and at least one output pad of a corresponding pad group;
- and
- a plurality of shift switching portions that control connection between at least one output pad of a corresponding pad group and at least one common node of a plurality of common nodes,
- wherein one of the shift switching portions, while turned on in the second operation mode, transmits signals from the common nodes to a plurality of output pads of a corresponding pad group, and each of the other shift switching portions among the plurality of shift switching portions, while turned on in the second operation mode, transmits a plurality of output signals of a corresponding buffer group to the plurality of common nodes,
- wherein, in the second operation mode, one of the plurality of output switching portions turns on at a different time from the other shift switching portions;
- wherein, in the second operation mode, the one output switching portion and the other shift switching portions are sequentially turned on during a predetermined time, and
- wherein the one output switching portion is in an ON state during at least a period in which the other shift switching portions are sequentially turned on.
13 more elements
Dependencies are inferred from the claim text.