Display device
First Claim
Patent Images
1. A display device comprising:
- a plurality of common electrodes extending in a first direction and arranged in parallel with each other;
a plurality of detection electrodes extending in a second direction crossing the first direction and arranged in parallel with each other;
a common-electrode drive circuit including a plurality of shift registers connected in series to each other and a plurality of switch circuits electrically connected to the shift registers, respectively; and
a driver which outputs four-phase clock signals and a touch-drive signal to control the common-electrode drive circuit,whereineach of the shift registers is configured to transfer a shift signal, and a reset operation of the each shift register is controlled by predetermined two of the four-phase clock signals,each of the switch circuits connects a signal line from the driver to a common electrode or electrodes of an associated block based on a shift signal output from an associated shift register for outputting the touch-drive signal,the each switch circuit causes the touch-drive signal from the driver to be supplied to the common electrode or electrodes of the block during a period from time at which the shift signal is output from the associated shift register to time at which a predetermined one of the four-phase clock signals is input,each of the switch circuits supplies the touch-drive signal to the signal line when the touch-drive signal is input from the driver, and disconnects the signal line from the common electrode or electrodes of the block when the predetermined one of the four-phase clock signals is input from the driver,the driver successively and repeatedly outputs first to fourth clock signals that are the four-phase clock signals, andwhere a clock signal for controlling a transfer operation of the shift register is an Nth clock signal, a clock signal for controlling the reset operation of the shift register is an Mth clock signal, and a clock signal to be input to the switch circuit connected to the shift register is a Kth clock signal, N, M and K are integers of 4 or less, and the following relationships are satisfied;
(N+2)≡
M mod 4when M≡
1 mod 4 or M≡
2 mod 4, K=4, andwhen M≡
3 mod 4 or M≡
0 mod 4, K=2.
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Accused Products
Abstract
According to one embodiment, a display device includes common electrodes, detection electrodes, a common-electrode drive circuit including shift registers and switch circuits electrically connected to the shift registers, and a driver which outputs four-phase clock signals and a touch-drive signal, wherein a reset operation of the each shift register is controlled by predetermined two of the four-phase clock signals, each of the switch circuits connects a signal line from the driver to common electrodes based on a shift signal output from an associated shift register, and the each switch circuit causes the touch-drive signal from the driver to be supplied to the common electrodes of the block during a period from time at which the shift signal is output from the associated shift register to time at which a predetermined one of the four-phase clock signals is input.
14 Citations
17 Claims
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1. A display device comprising:
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a plurality of common electrodes extending in a first direction and arranged in parallel with each other; a plurality of detection electrodes extending in a second direction crossing the first direction and arranged in parallel with each other; a common-electrode drive circuit including a plurality of shift registers connected in series to each other and a plurality of switch circuits electrically connected to the shift registers, respectively; and a driver which outputs four-phase clock signals and a touch-drive signal to control the common-electrode drive circuit, wherein each of the shift registers is configured to transfer a shift signal, and a reset operation of the each shift register is controlled by predetermined two of the four-phase clock signals, each of the switch circuits connects a signal line from the driver to a common electrode or electrodes of an associated block based on a shift signal output from an associated shift register for outputting the touch-drive signal, the each switch circuit causes the touch-drive signal from the driver to be supplied to the common electrode or electrodes of the block during a period from time at which the shift signal is output from the associated shift register to time at which a predetermined one of the four-phase clock signals is input, each of the switch circuits supplies the touch-drive signal to the signal line when the touch-drive signal is input from the driver, and disconnects the signal line from the common electrode or electrodes of the block when the predetermined one of the four-phase clock signals is input from the driver, the driver successively and repeatedly outputs first to fourth clock signals that are the four-phase clock signals, and where a clock signal for controlling a transfer operation of the shift register is an Nth clock signal, a clock signal for controlling the reset operation of the shift register is an Mth clock signal, and a clock signal to be input to the switch circuit connected to the shift register is a Kth clock signal, N, M and K are integers of 4 or less, and the following relationships are satisfied;
(N+2)≡
M mod 4when M≡
1 mod 4 or M≡
2 mod 4, K=4, andwhen M≡
3 mod 4 or M≡
0 mod 4, K=2. - View Dependent Claims (2, 3, 4, 5)
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6. A display device comprising:
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common electrodes doubling as electrodes for an image display operation and electrodes for a touch detection operation; and a drive circuit which drives the common electrodes, wherein the common electrodes include an nth common electrode (n≥
1), an n+1th common electrode and an n+2th common electrode,the drive circuit includes;
switch circuits which output signals for the touch detection signal or signals for the image display operation to the common electrodes in a switchable manner; and
shift register circuits which output control signals to the switch circuits,the switch circuits include an nth switch circuit, an n+1th switch circuit and an n+2th switch circuit, the nth switch circuit, the n+1th switch circuit and the n+2th switch circuit hold control signals from the shift register circuits as an nth switch signal, an n+1th switch signal and an n+2th switch signal, respectively, the nth switch circuit, the n+1th switch circuit and the n+2th switch circuit are electrically connected to the nth common electrode, the n+1th common electrode and the n+2th common electrode, respectively, and in a period in which the nth switch circuit and the n+1th switch circuit simultaneously hold the nth switch signal and the n+1th switch signal, respectively, the n+2th switch circuit starts to hold the n+2th switch signal, clock signals each of which comprises a first voltage and a second voltage are input to the shift register circuits, the clock signals include a first clock signal, a second clock signal, a third clock signal and a fourth clock signal, the first clock signal, the second clock signal, the third clock signal and the fourth clock signal are transformed into first voltages in this order, and the nth switch circuit, to which the first voltage obtained by transforming the first clock signal is input as a control signal, and the n+1th switch circuit to which the first voltage obtained by transforming the second clock signal is input as another control signal, stop holding of the nth switch signal and holding of the n+1th switch signal, respectively, upon reception of the first voltage from the fourth clock signal. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A display device comprising:
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a plurality of common electrodes doubling as electrodes for an image display operation and electrodes for a touch detection operation; and a plurality of drive circuits for driving the common electrodes, wherein the drive circuits include;
switch circuits each of which outputs a signal for the touch detection operation or a signal for the image display operation to the common electrodes in a switchable manner; and
shift register circuits each of which outputs a control signal to an associated one of the switch circuits,the switch circuits include hold circuits each of which holds the control signal from an associated one of the shift register circuits as a switch signal, clock signals each of which comprises a first voltage and a second voltage are input to the shift register circuits, the clock signals include a first clock signal, a second clock signal, a third clock signal and a fourth clock signal, the first clock signal, the second clock signal, the third clock signal and the fourth clock signal are transformed into first voltages in this order, the common electrodes include a first common electrode and a second common electrode which are arranged adjacent to each other, the switch circuits include a first switch circuit which outputs a signal for the touch detection operation to the first common electrode, upon reception of the first clock signal, which is input as a control signal, the switch circuits include a second switch circuit which outputs a signal for the touch detection operation to the second common electrode upon reception of the second clock signal, which is input as another control signal, and hold circuits of the first switch circuit and the second switch circuit stop holding of respective switch signals with the first voltage of the fourth clock signal. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification
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Current AssigneeJapan Display Incorporated
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Original AssigneeJapan Display Incorporated
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InventorsAbe, Hiroyuki
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Primary Examiner(s)Rosario, Nelson
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Assistant Examiner(s)Au, Scott
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Application NumberUS15/193,708Publication NumberTime in Patent Office827 DaysField of SearchUS Class CurrentCPC Class CodesG06F 3/0412 Digitisers structurally int...G06F 3/04166 Details of scanning methods...G06F 3/04184 Synchronisation with the dr...G06F 3/0445 using two or more layers of...G06F 3/0446 using a grid-like structure...G09G 5/00 Control arrangements or cir...
