Display device including touch panel device, and coupling-noise eliminating method

• US 9,535,526 B2
• Filed: 02/11/2015
• Issued: 01/03/2017
• Est. Priority Date: 09/08/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Goo, Nam-Hee, Kim, Bo-Ram, Kim, Myoung-Chul, Lee, Byoung-Jun, Kim, Yun-Jae
• Primary Examiner(s): Pappas, Claire X
• Assistant Examiner(s): STONE, ROBERT M
• Application Number:
  US14/619,882
• Publication Number:
  US 20150153883A1
• Time in Patent Office: 692 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally

Abstract

A display device includes; a touch panel device including; a touch panel and a touch controller connected to the touch panel, the touch controller including; a sampling unit which samples a sensing output signal input thereto from the touch panel to generate a sampled signal, and an analog/digital converter which converts the sampled signal to generate contact information, and a display panel device including; a display panel, a gate driver which applies a gate signal to the display panel, and a data driver which applies a data voltage to the display panel, wherein the sampling unit samples a portion of the sensing output signal which does not include a coupling noise.

Claims

1. A display device comprising:

a touch panel device comprising;

a touch panel; and

a touch controller connected to the touch panel, the touch controller comprising;

a noise removing unit which removes a coupling noise from a sensing output signal input thereto from the touch panel and which outputs a noise-free sensing output signal;

a sampling unit which samples the noise-free sensing output signal to generate a sampled signal; and

an analog/digital converter which converts the sampled signal to generate contact information; and

a display panel device comprising;

a display panel;

a gate driver which applies a gate signal to the display panel; and

a data driver which applies a data voltage to the display panel,

wherein the noise removing unit receives a reference noise signal from the touch panel and generates the noise-free sensing output signal by subtracting the reference noise signal from the sensing output signal, wherein

the touch panel is disposed substantially opposite to the display panel,

the touch panel includes a touch region for sensing a touch and a reference noise extracting region electrically separated from the touch region,

the touch region includes a first electrode which outputs the sensing output signal, and

the reference noise extracting region includes a second electrode which receives a reference voltage including about 0 V and which outputs the reference noise signal to the touch controller, and wherein

the touch region includes a plurality of x-axis electrodes and a plurality of y-axis electrodes insulated from and disposed substantially perpendicular to the plurality of x-axis electrodes,

the sensing output signal is output from a first x-axis electrode of the plurality of x-axis electrodes and a first y-axis electrode of the plurality of y-axis electrodes that correspond to a touch point of the touch panel, and

the reference noise signal is output from at least one of the plurality of x-axis electrodes except the first x-axis electrode and at least one of the plurality of y-axis electrodes except the first y-axis electrode.

2. A display device comprising:

a touch panel device comprising;

a touch panel; and

a touch controller connected to the touch panel, the touch controller comprising;

a noise removing unit;

a sampling unit connected to the noise removing unit; and

an analog/digital converter connected to the sampling unit; and

a display panel device comprising;

a display panel;

a gate driver which applies a gate signal to the display panel; and

a data driver which applies a data voltage to the display panel,

wherein the touch controller inputs a sensing input signal and an inversion sensing input signal, which is inverted with respect to the sensing input signal, to the touch panel, and receives a sensing output signal corresponding to the sensing input signal and an inversion sensing output signal corresponding to the inversion sensing input signal from the touch panel,

the noise removing unit removes a coupling noise from the sensing output signal to generate a noise-free sensing output signal, the sampling unit samples the noise-free sensing output signal to generate a sampled signal, and the analog/digital converter converts the sampled signal to generate contact information, and

the noise removing unit generates the noise-free sensing output signal by subtracting the inversion sensing output signal from the sensing output signal and dividing the subtraction result in half.

3. A display device comprising:

a touch panel device comprising;

a touch panel; and

a touch controller connected to the touch panel, the touch controller comprising;

a sampling unit which samples a sensing output signal input thereto from the touch panel to generate a sampled signal;

a filter which generates a coupling noise removed signal by removing a coupling noise from the sampled signal; and

an analog/digital converter which converts the coupling noise removed signal to generate contact information; and

a display panel device comprising;

a display panel;

a gate driver which applies a gate signal to the display panel; and

a data driver which applies a data voltage to the display panel, wherein

the sampled signal includes a plurality of extracted data in series,

the filter compares the plurality of extracted data with each other, and

the filter compares a value of a first data of the plurality of extracted data with a value of a previous data of the first data and a value of a next data of the first data among the plurality of extracted data, and removes the first data from the plurality of extracted data when a difference between a value of the first data and a value of the previous data, or a difference between the value of the first data and a value of the next data, is equal to or greater than a predetermined value.

4. A method for eliminating a coupling noise of a display device including a touch panel device including a touch panel and a touch controller, and a display panel device including a display panel, a gate driver which applies a gate signal to the display panel, and a data driver which applies a data voltage to the display panel, the method comprising:

receiving a sensing output signal including a coupling noise, and a reference noise signal from the touch panel;

generating a noise-free sensing output signal by subtracting the reference noise signal from the sensing output signal to remove the coupling noise from the sensing output signal;

sampling the noise-free sensing output signal to generate a sampled signal; and

generating contact information by converting the sampled signal, wherein

the touch region includes a plurality of x-axis electrodes and a plurality of y-axis electrodes insulated from and disposed substantially perpendicular to the x-axis electrodes,

the sensing output signal is output from a first x-axis electrode and a first y-axis electrode corresponding to a touch point of the touch panel among the plurality of x-axis electrodes and the plurality of y-axis electrodes, and

the reference noise signal is output from at least one of the plurality of x-axis electrodes except the first x-axis electrode and from at least one of the plurality of y-axis electrodes except the first y-axis electrode.

5. A method for eliminating a coupling noise of a display device including a touch panel device including a touch panel and a touch controller, and a display panel device including a display panel, a gate driver which applies a gate signal to the display panel, and a data driver which applies a data voltage to the display panel, the method comprising:

inputting a sensing input signal and an inversion sensing input signal, which is an inverted signal of the sensing input signal, to the touch panel;

receiving a sensing output signal corresponding to the sensing input signal, and an inversion sensing output signal corresponding to the inversion sensing input signal from the touch panel;

generating a noise-free sensing output signal by subtracting the inversion sensing output signal from the sensing output signal and dividing the subtraction result in half;

generating a sampled signal by sampling the noise-free sensing output signal; and

generating contact information by converting the sampled signal.

6. A method for eliminating a coupling noise of a display device including a touch panel device including a touch panel and a touch controller, and a display panel device including a display panel, a gate driver which applies a gate signal to the display panel, and a data driver which applies a data voltage to the display panel, the method comprising:

receiving a sensing output signal including a coupling noise from the touch panel;

generating a sampled signal by sampling the sensing output signal;

generating a coupling noise removed signal by removing the coupling noise from the sampled signal; and

generating contact information by converting the coupling noise removed signal,

wherein

the sampled signals include a plurality of extracted data in series,

the removing of the coupling noise from the sampled signal comprises;

comparing a value of a first data of the plurality of extracted data with a value of a previous data of the first data and a value of a next data of the first data among the plurality of extracted data; and

removing the first data from the plurality of extracted data when a difference between a value of the first data and a value of the previous data or a difference between the value of the first data and a value of the next data is equal to or greater than a predetermined value.