Information processing method, touch information processing device, and flat panel display

1. A touch information processing method comprising:

generating sensor output data from a touch sensor array including a plurality of touch sensors;

individually storing the sensor output data in a frame unit and computing the sensor output data corresponding to adjacent frames to generate difference data;

first binarizing the difference data based on a previously determined first threshold value to generate the difference data corresponding to a black gray level and the difference data corresponding to a white gray level;

filtering the first binarized difference data to vary a gray level of the difference data corresponding to the black gray level depending on a black density around the difference data corresponding to the black gray level; and

second binarizing the filtered difference data based on a previously determined second threshold value to generate the difference data corresponding to the black gray level and the difference data corresponding to the white gray level,

wherein the filtering of the first binarized difference data uses Gaussian kernel expressed by the following Equation:

K

=

1

2

⁢

πσ

⁢

exp

(

-

x

2

2

⁢

σ

2

)

.

2. The touch information processing method of claim 1 , wherein the filtering of the first binarized difference data comprises:

changing a gray level of the difference data having a relatively low black density among the difference data corresponding to the black gray level to a first gray level greater than the black gray level; and

changing a gray level of the difference data having a relatively high black density among the difference data corresponding to the black gray level to a second gray level that is greater than the black gray level and is less than the first gray level.

3. The touch information processing method of claim 2 , wherein the second threshold value has a gray level between the first gray level and the second gray level.

4. A touch information processing device comprising:

a touch sensor array including a plurality of touch sensors;

a frame difference unit that obtains sensor output data from the touch sensor array in a frame unit and computes the sensor output data corresponding to adjacent frames to generate difference data;

a first binary unit that first binarizes the difference data based on a previously determined first threshold value to generate the difference data corresponding to a black gray level and the difference data corresponding to a white gray level;

a filtering unit that filters the first binarized difference data to vary a gray level of the difference data corresponding to the black gray level depending on a black density around the difference data corresponding to the black gray level; and

a second binary unit that second binarizes the filtered difference data based on a previously determined second threshold value to generate the difference data corresponding to the black gray level and the difference data corresponding to the white gray level,

wherein the filtering unit filters the first binarized difference data using Gaussian kernel expressed by the following Equation:

K

=

1

2

⁢

πσ

⁢

exp

(

-

x

2

2

⁢

σ

2

)

.

5. The touch information processing device of claim 4 , wherein the filtering unit changes a gray level of the difference data having a relatively low black density among the difference data corresponding to the black gray level to a first gray level greater than the black gray level,

wherein the filtering unit changes a gray level of the difference data having a relatively high black density among the difference data corresponding to the black gray level to a second gray level that is greater than the black gray level and is less than the first gray level.

6. The touch information processing device of claim 5 , wherein the second threshold value has a gray level between the first gray level and the second gray level.

7. A flat panel display comprising:

a display device including a display panel, a data drive circuit driving data lines of the display panel, a scan drive circuit driving gate lines of the display panel, and a timing controller controlling operation timing of each of the data drive circuit and the scan drive circuit; and

a touch information processing device including:

a touch sensor array including a plurality of touch sensors;

a frame difference unit that obtains sensor output data from the touch sensor array in a frame unit and computes the sensor output data corresponding to adjacent frames to generate difference data;

a first binary unit that first binarizes the difference data based on a previously determined first threshold value to generate the difference data corresponding to a black gray level and the difference data corresponding to a white gray level;

a filtering unit that filters the first binarized difference data to vary a gray level of the difference data corresponding to the black gray level depending on a black density around the difference data corresponding to the black gray level; and

a second binary unit that second binarizes the filtered difference data based on a previously determined second threshold value to generate the difference data corresponding to the black gray level and the difference data corresponding to the white gray level,

wherein the filtering unit filters the first binarized difference data using Gaussian kernel expressed by the following Equation:

K

=

1

2

⁢

πσ

⁢

exp

(

-

x

2

2

⁢

σ

2

)

.

8. The flat panel display of claim 7 , wherein the filtering unit changes a gray level of the difference data having a relatively low black density among the difference data corresponding to the black gray level to a first gray level greater than the black gray level,

wherein the filtering unit changes a gray level of the difference data having a relatively high black density among the difference data corresponding to the black gray level to a second gray level that is greater than the black gray level and is less than the first gray level.

9. The flat panel display of claim 8 , wherein the second threshold value has a gray level between the first gray level and the second gray level.

10. The flat panel display of claim 7 , wherein the plurality of touch sensors are formed inside a pixel array of the display panel.

11. The flat panel display of claim 7 , wherein the plurality of touch sensors are positioned on an upper polarizing plate of the display panel or are interposed between the upper polarizing plate of the display panel and an upper glass substrate of the display panel.

12. The flat panel display of claim 7 , wherein the plurality of touch sensors are interposed between the upper polarizing plate of the display panel and an upper glass substrate of the display panel.