KR20170027407A - Apparatus for controlling touch sensor - Google Patents
Apparatus for controlling touch sensor Download PDFInfo
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- KR20170027407A KR20170027407A KR1020150123966A KR20150123966A KR20170027407A KR 20170027407 A KR20170027407 A KR 20170027407A KR 1020150123966 A KR1020150123966 A KR 1020150123966A KR 20150123966 A KR20150123966 A KR 20150123966A KR 20170027407 A KR20170027407 A KR 20170027407A
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- signal
- reset
- unit
- output
- touch sensor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
Description
More particularly, the present invention relates to a touch sensor control apparatus, and more particularly to a touch sensor control apparatus capable of reducing the influence of noise that can distort the output of a sensor element on an output signal of a receiving unit, In the touch sensor control device.
A touch sensor is an input device that detects contact of a user's finger or other input object and converts it into an appropriate electric signal to recognize coordinates or gestures, etc., and is applied to various electronic devices. In particular, since the touch sensor is directly coupled to a display device of an electronic device and can replace a space occupied by a separate input device such as a keypad, the touch sensor is widely applied to electronic devices such as a mobile phone, a smart phone, a PDA, and a tablet PC.
The touch sensor can be divided into resistive type, capacitive type, ultrasonic type, and infrared type depending on the method of detecting the touch input. Among them, the electrostatic capacitance type senses the position and the like of a contact object by using a capacitance change generated between a contact object and a transparent sensing electrode when an electrically conductive object (for example, a finger) is contacted Method. The capacitive touch screen has a longer life, thinner thickness, and easier multi-touch support than other types of touch screens.
The touch sensor control device must be able to recognize a change in capacitance caused by a touch. A touch sensor control device that senses the capacitance of a finely varying touch sensor may be vulnerable to a noise signal. The noise that may occur for various reasons may cause a change in the width of the touch sensor to be larger than that of the capacitance of the touch sensor so that the signal received by the touch sensor control device may be distorted.
The present invention can provide an apparatus and a system capable of processing a signal output from a touch sensor without distortion by preventing a saturation state of an amplifier included in the touch sensor control apparatus.
The present invention can also provide an apparatus and method that can increase the drive range of an amplifier without increasing the drive voltage of the amplifier included in the device / circuit for signal processing or increasing the capacitance of the feedback capacitor in the amplifier have.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.
The present invention can provide a touch sensor that operates with an input signal having a relatively small amplitude with an improved signal-to-noise ratio (SNR).
According to an embodiment of the present invention, there is provided an apparatus for controlling a touch sensor, comprising: an amplifier for amplifying an output signal of a touch sensor; A converter for converting a signal transmitted from the amplifying unit into a digital signal; And a sensing unit for determining a reset time of the amplifying unit when the output value of the converting unit is out of a predetermined range.
In addition, the touch sensor control apparatus includes a reset signal unit for transmitting a reset signal to the amplification unit in response to the reset time; A reconstruction unit for reconstructing the digital signal corresponding to the reset time; And a noise analyzer for analyzing noise using the signal reconstructed by the reconstructor.
In addition, the reset signal may include information on the reset time and direction information for increasing or decreasing the output signal.
Also, the reset signal may include at least one of a reset decrement signal and a reset increment signal, the reset decrement signal may reduce the magnitude of the output signal, and the reset increment signal may increase the magnitude of the output signal.
In addition, the magnitude of the amplitude at which the output signal is adjusted by the reset reduction signal and the reset increase signal may be the same.
The amplifying unit may include an input terminal for adjusting the output signal in response to the reset signal; And an amplification stage for amplifying the signal transmitted from the input terminal with at least one amplification gain.
The restoration unit may perform an operation of adding or subtracting a constant value to the output of the conversion unit in response to the reset signal until a next reset signal is generated.
The amplification unit may adjust the absolute value of the amplitude of the output signal by a value obtained by dividing 1/2 of the range by the amplification gain of the amplifier when the reset signal is input.
Also, the range may be determined as 70% to 80% based on the difference between the intermediate value and the maximum value and the minimum value of the digital signal.
According to another aspect of the present invention, there is provided a touch screen device including: a display panel having a plurality of touch sensors arranged in a matrix; And a touch sensor controller for converting the output signal to a digital signal after the output signal is increased or decreased by a predetermined value when the output signal of the plurality of touch sensors is out of a preset range and restoring the digital signal to correspond to the output signal have.
The touch sensor control unit may further include: an amplifying unit amplifying the output signal; A converter for converting a signal transmitted from the amplifying unit into a digital signal; A detection unit for determining a reset time of the amplification unit when an output value of the conversion unit is out of a predetermined range; A reset signal unit for transmitting a reset signal to the amplifier unit in response to the reset time; And a decompression unit for decompressing the digital signal corresponding to the reset time.
In addition, the reset signal may include information on the reset time and direction information for increasing or decreasing the output signal.
Also, the reset signal may include at least one of a reset decrement signal and a reset increment signal, the reset decrement signal may reduce the magnitude of the output signal, and the reset increment signal may increase the magnitude of the output signal.
In addition, the magnitude of the amplitude at which the output signal is adjusted by the reset reduction signal and the reset increase signal may be the same.
The amplifying unit may include an input terminal for adjusting the output signal in response to the reset signal; And an amplification stage for amplifying the signal transmitted from the input terminal with at least one amplification gain.
The amplification unit may adjust the absolute value of the amplitude of the output signal by a value obtained by dividing 1/2 of the range by the amplification gain of the amplifier when the reset signal is input.
The restoration unit may perform an operation of adding or subtracting a constant value to the output of the conversion unit in response to the reset signal until a next reset signal is generated.
Also, the range may be determined as 70% to 80% based on the difference between the intermediate value and the maximum value and the minimum value of the digital signal.
In addition, the touch screen apparatus may further include a noise analyzer for analyzing noise using the signal restored by the touch sensor controller.
According to another aspect of the present invention, there is provided a method of controlling a touch sensor, comprising: amplifying an output signal of a touch sensor with a predetermined gain; Converting the amplified signal into a digital signal; Determining a reset time when the digital signal is out of a predetermined range; Adjusting the output signal corresponding to a reset signal generated corresponding to the reset time; And recovering the digital signal corresponding to the reset time.
In addition, the step of adjusting the output signal may adjust the absolute value of the magnitude of the output signal by a value obtained by dividing 1/2 of the range by the amplification gain when the reset signal is input.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And can be understood and understood.
Effects of the method and apparatus according to the present invention will be described as follows.
The present invention can prevent the saturation state of the amplifier in the process of controlling the output signal of the touch sensor, thereby preventing distortion of the output signal of the touch sensor.
In addition, according to the present invention, the process of controlling the output signal of the touch sensor is performed through calculation in the digital domain, so that the circuit configuration can be simplified.
Further, the present invention is applicable to an apparatus or a system including a touch sensor as well as to an apparatus including an element for amplifying and converting an analog signal into a digital signal.
The effects obtainable by the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
Figure 1 illustrates the clipping phenomenon of an amplifier that may occur in an apparatus and system that includes a touch sensor.
Fig. 2 illustrates a touch sensor control apparatus.
3 illustrates an example of the amplification section corresponding to the reset signal.
4 illustrates the operation of the amplifying unit shown in Fig.
Fig. 5 illustrates the amplifier shown in Fig. 2. Fig.
Fig. 6 illustrates the conversion unit shown in Fig. 2. Fig.
Fig. 7 illustrates the restoring section shown in Fig. 2. Fig.
FIG. 8 illustrates the touch sensor control apparatus shown in FIG. 2. FIG.
FIG. 9 illustrates the noise analysis unit shown in FIG. 2. FIG.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.
In the description of the embodiments, when it is described as being formed on the "upper" or "lower" of each element, the upper or lower (lower) And that at least one further component is formed and arranged between the two components. Also, the expression "upward" or "downward" may include not only an upward direction but also a downward direction with respect to one component.
Figure 1 illustrates the clipping phenomenon of an amplifier that may occur in an apparatus and system that includes a touch sensor.
Devices and systems including a touch sensor, such as a touch screen, may have a low drive voltage / current level of the touch sensor to reduce power consumption. When the driving voltage / current of the touch sensor is low, the magnitude of the signal output from the touch sensor may vary very finely. An amplifier can be used to properly control a finely varying signal. At this time, the amplification gain of the amplifier may be 1 or larger than 1. If the amplification gain of the amplifier is 1, the unstable voltage / current level can be clarified through the amplifier, rather than amplifying the signal output from the touch sensor significantly.
FIG. 1 illustrates the case where the amplification gain of the amplifier is 1 as an example. Referring to FIG. 1, the
There are various ways to detect whether the output of the amplifier is in a saturated state. For example, it is assumed that the output signal of the amplifier does not exceed the input range of the analog-to-digital converter (ADC). When the
In order to prevent clipping occurring in the amplifier, it is necessary to increase the capacitance of the feedback capacitor included in the amplifier or to increase the supply voltage supplied to the amplifier, A large signal range can be ensured. However, if the capacitance of the feedback capacitor is increased, there may be a disadvantage that the size of the amplifier becomes large. In addition, when the supply voltage is increased, there is a drawback that the amplifier not only has to output in response to a high driving voltage but also consumes a large amount of power.
To overcome this, the output value of the analog signal output from the amplifier is converted into a digital signal (after analog to digital conversion), and then the value of the digital signal is monitored to see if it exceeds a certain range. If the value of the digital signal exceeds a certain range, a reset signal may be transmitted to the amplifier to prevent the output of the amplifier from reaching a saturation state. Resetting the amplifier can amplify the input signal, but since the level of the output signal is close to the reference voltage (e.g., the middle value), the output signal can be distorted by the reset signal relative to the input signal. The distorted output signal may be converted into a digital signal and then restored in response to the reset signal. It is possible to have an output signal corresponding to the input signal by performing a restoration process while preventing the output of the amplifier from reaching a saturation state.
The touch screen apparatus to which the above-described method is applied includes a display panel in which a plurality of touch sensors are arranged in a matrix form, and a display panel in which, when the output signals of the plurality of touch sensors are out of a preset range, And a touch sensor controller for converting the digital signal into a digital signal and restoring the digital signal to correspond to the output signal.
Fig. 2 illustrates a touch sensor control apparatus.
As shown in the figure, the touch sensor control apparatus includes an
The signal output from the
The
The touch sensor control device includes a
The reset signal generated by the
The amplifying
3 illustrates an example of the amplification section corresponding to the reset signal.
As described with reference to FIG. 2, the amplifying unit may reset the amplified signal corresponding to the reset signal to the reference voltage, but may also amplify the signal after adjusting the signal before amplification corresponding to the reset signal.
3, the
Fig. 4 illustrates the operation of the amplifying
Referring to FIG. 4B, it can be assumed that the output signal of the
Referring to FIGS. 4 (a) to 4 (c), the amplifying
In the second period t1 to t2, the
At this time, the information on the reset time t1 or t2 due to the
In the third period (t2 to t3), the
On the other hand, the output signal in the third section may not be distorted with respect to the input signal because the two reset operations (the first and second timings) are opposite to each other.
In the fourth section from t3 to t4, the amplifying
Fig. 5 illustrates the amplifying
5A, the output signal of the
5A and 5B, the output signal of the amplifying
Fig. 6 illustrates the
When the converting
Fig. 7 illustrates the
7A, the output of the amplifying
7B, in response to the reset signal outputted from the
7 (c), the restoring
For example, the time points (t1, t2, t3, t4) at which the reset signal is generated are set to a point at which the output value of the converting
Specifically, the direction information S for the increase and decrease can be expressed as follows
The detailed operation of the
Here, T is a threshold value.
The digital signal x [n] input to the
FIG. 8 illustrates the touch sensor control apparatus shown in FIG. 2. FIG. More specifically, (a) shows an example of a signal output from the
8 (a) and 8 (e), the signal input to the touch sensor control device is converted into a digital signal, but a value exceeding the
8A to 8E illustrate the operation without reflecting the delays that may occur in the circuits of the respective components of the touch sensor control device, If it affects the operation, the
FIG. 9 illustrates the
As shown in the figure, the
The operation of the
Where fn is the frequency the user wishes to observe and fs is the sampling rate of the transformer, x [k] is the sample of the reconstructed signal, N is the total number of samples used for the observation, .
The
The
It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.
10: touch sensor 12:
14: conversion section 16:
18: reset signal unit 20:
22: Noise Analysis Unit
Claims (21)
A converter for converting a signal transmitted from the amplifying unit into a digital signal; And
Wherein when the output value of the converting unit is out of a preset range,
And the touch sensor control device.
A reset signal unit for transmitting a reset signal to the amplifier unit in response to the reset time;
A reconstruction unit for reconstructing the digital signal corresponding to the reset time; And
A noise analysis unit for analyzing noise using the signal reconstructed by the reconstruction unit,
Wherein the touch sensor control device further comprises:
Wherein the reset signal includes information on the reset time and direction information for increasing or decreasing the output signal.
Wherein the reset signal comprises at least one of a reset decrement signal and a reset increment signal,
The reset reduction signal decreasing the magnitude of the output signal,
Wherein the reset increase signal increases the magnitude of the output signal.
Wherein the magnitude of the magnitude of the output signal being adjusted by the reset decrease signal and the reset increase signal is the same.
The amplifying unit
An input terminal for adjusting the output signal in response to the reset signal; And
An amplification stage for amplifying a signal transmitted from the input terminal by at least one amplification gain;
Wherein the touch sensor is a touch sensor.
Wherein the decompression unit performs an operation of adding or subtracting a constant value to the output of the conversion unit in response to the reset signal until a next reset signal is generated.
Wherein the amplification unit adjusts the absolute value of the magnitude of the output signal by a value obtained by dividing 1/2 of the range by the amplification gain of the amplification stage when the reset signal is inputted.
Wherein the range is determined to be 70 to 80% based on a difference between an intermediate value and a maximum value and a minimum value of the digital signal.
A touch sensor controller for converting the output signal to a digital signal after the output signal is increased or decreased by a predetermined value and restoring the digital signal to correspond to the output signal when the output signals of the plurality of touch sensors are out of a preset range,
And the touch screen device.
The touch sensor control unit
An amplifier for amplifying the output signal;
A converter for converting a signal transmitted from the amplifying unit into a digital signal;
A detection unit for determining a reset time of the amplification unit when an output value of the conversion unit is out of a predetermined range;
A reset signal unit for transmitting a reset signal to the amplifier unit in response to the reset time; And
And a recovery unit for restoring the digital signal corresponding to the reset time,
The touch screen device further comprising:
Wherein the reset signal includes information on the reset time and direction information for increasing or decreasing the output signal.
Wherein the reset signal comprises at least one of a reset decrement signal and a reset increment signal,
The reset reduction signal decreasing the magnitude of the output signal,
Wherein the reset increase signal increases the magnitude of the output signal.
Wherein the magnitude of the magnitude of the output signal being adjusted by the reset reduction signal and the reset increase signal is the same.
The amplifying unit
An input terminal for adjusting the output signal in response to the reset signal; And
An amplification stage for amplifying a signal transmitted from the input terminal by at least one amplification gain;
/ RTI >
Wherein the amplification unit adjusts the absolute value of the magnitude of the output signal by a value obtained by dividing 1/2 of the range by the amplification gain of the amplification stage when the reset signal is inputted.
Wherein the restoration unit performs an operation of adding or subtracting a constant value to the output of the conversion unit in response to the reset signal until a next reset signal is generated.
Wherein the range is determined as 70% to 80% on the difference between the median value and the maximum value and the minimum value of the digital signal.
And a noise analyzer for analyzing noise using the signal restored by the touch sensor controller.
Converting the amplified signal into a digital signal;
Determining a reset time when the digital signal is out of a predetermined range;
Adjusting the output signal corresponding to a reset signal generated corresponding to the reset time; And
And restoring the digital signal corresponding to the reset time
Wherein the touch sensor is a touch sensor.
Wherein the step of adjusting the output signal adjusts an absolute value of the magnitude of the output signal by a value obtained by dividing 1/2 of the range by the amplification gain when the reset signal is input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150123966A KR20170027407A (en) | 2015-09-02 | 2015-09-02 | Apparatus for controlling touch sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150123966A KR20170027407A (en) | 2015-09-02 | 2015-09-02 | Apparatus for controlling touch sensor |
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| Publication Number | Publication Date |
|---|---|
| KR20170027407A true KR20170027407A (en) | 2017-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150123966A KR20170027407A (en) | 2015-09-02 | 2015-09-02 | Apparatus for controlling touch sensor |
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| Country | Link |
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| KR (1) | KR20170027407A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120120001A1 (en) | 2010-11-17 | 2012-05-17 | Stmicroelectronics Asia Pacific Pte Ltd. | Charge amplifier for multi-touch capacitive touch-screen |
-
2015
- 2015-09-02 KR KR1020150123966A patent/KR20170027407A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120120001A1 (en) | 2010-11-17 | 2012-05-17 | Stmicroelectronics Asia Pacific Pte Ltd. | Charge amplifier for multi-touch capacitive touch-screen |
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