Touch sensitive display device having resistance to noise, and control methods therefor
AssigneeSamsung Display Co., Ltd.
InventorJin Woo Noh
Life of this patent
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Abstract
Disclosed is a touch sensitive display device, including: a display panel configured to display an image according to received image data; a touch sensing unit configured to generate touch sensing signals in response to a touch; a data analyzing unit configured to determine a noise period from the image data; and a touch control unit configured to set a sensing period that is outside the noise period, and to calculate a touch position based on the touch sensing signals corresponding to the sensing period and not to the noise period.
Claims14
A touch sensitive display device, comprising:
- a display panel configured to display an image according to received image data;
- a touch sensing unit configured to generate touch sensing signals in response to a touch;
- a data analyzing unit configured to determine a noise period from the image data;
- and
- a touch control unit configured to set a sensing period that is outside the noise period and to calculate a touch position based on the touch sensing signals corresponding to the sensing period and not to the noise period,
- wherein the data analyzing unit calculates a size of a coupling noise between the display panel and the touch sensing unit corresponding to an ith horizontal line according to:
- CN
-
- (
- CouplingNoise
- )
- i
- =
- ∑
- j
- =
- 1
- j
- =
- m
-
- a
- j
- *
- g
-
- (
- f
-
- (
- data
- i
- +
- 1
- ,
- j
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- -
- f
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- (
- data
- i
- ,
- j
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- where i and j are natural numbers, datai+1,j is an image data value corresponding to a pixel in an i+1th row and a jth column, datai,j is an image data value corresponding to a pixel in an ith row and the jth column, f( ) is a function of a voltage applied to the data line according to the image data value, g( ) is a function of coupling noise generated in the touch sensing unit by a voltage variation of the data line, and aj is a weighting coefficient of a jth data line.
A method of controlling a touch sensitive display device which includes a display panel for displaying an image according to received image data and a touch sensing unit for generating touch sensing signals in response to a touch, the method comprising:
- determining a noise period from the image data;
- setting a sensing period that is outside the noise period;
- and
- calculating a touch position based on only those touch sensing signals corresponding to the sensing period,
- wherein the determining a noise period further includes calculating a size of a coupling noise between the display panel and the touch sensing unit corresponding to an ith horizontal line according to:
- CN
-
- (
- CouplingNoise
- )
- i
- =
- ∑
- j
- =
- 1
- j
- =
- m
-
- a
- j
- *
- g
-
- (
- f
-
- (
- data
- i
- +
- 1
- ,
- j
- )
- -
- f
-
- (
- data
- i
- ,
- j
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- )
- where i and j are natural numbers, datai+1,j is an image data value corresponding to a pixel in an i+1th row and a jth column, datai,j is an image data value corresponding to a pixel in an ith row and the jth column, f( ) is a function of a voltage applied to the data line according to the image data value, g( ) is a function of coupling noise generated in the touch sensing unit by a voltage variation of the data line, and aj is a weighting coefficient of jth data line.
Dependencies are inferred from the claim text.