Patent Application
20170153748
This invention is about a coordinate input device and, in particular, about coordinate input device which can sense both touch input of capacitive object and touch input of stylus pen which is equipped with resonance circuit.
Coordinate input device has been broadly used in computer-based user interface such as touch screen and digitizer. In case of touch screen, various sensing panel are used according to the ways of detecting touch. As representative ways of touch sensing, there are resistant film way, capacitive way, infrared way, ultrasonic waves way and camera way. As for capacitive way, it is broadly used for small and mid-sized portable devices such as smart phone and tablet PC. Meanwhile, as for digitizer, it is broadly used in graphic application areas because sensitive touch input is available.
Recently, digitizer starts to be loaded into those devices along with touch screen of capacitive way in that people want to realize respective merits of them in one device. However, sensing panel with capacitive way and digitizer panel are independently loaded into devices, which become a factor of price rise. In addition, as for touch screen with capacitive way, display panel is placed on its front and a number of restrictive problems in manufacturing devices are caused. If capacitive-typed touch screen can be placed in the rear of display, a lot of advantages can be taken in manufacturing and technical aspects but its performance in tough sense is behind.
The purpose of this invention is to provide coordinate input device having more improved touch sense performance or provide coordinate input device which can sense both touch of capacitive object and touch input of stylus pen embedding resonant circuit by using one sensing panel.
One feature of this invention to achieve technical task as mentioned above is regarding coordinate input device having improved touch sense performance. The coordinate input device of this invention includes: the first sensing strip antenna group for detecting the first coordinate in touch input coordinate, multiple sensing strip antenna including the 2nd sensing strip antenna for detecting the second coordinate in touch input coordinate and sensing control circuit which calculates touch input coordinate based on variation of electric property related to impedance matching of scan signal as mentioned above, which is generated in responding to touch input coordinate of black object above.
As an embodiment, sensing control circuit as mentioned above includes: the first scan switching part for selectively driving the first sensing strip antenna group; the second scan switching part for selectively driving the second sensing strip antenna group; scan signal source which generates scan signals of the first and second frequencies; the first impedance interface which is formed between scan signal source and the first scan switching part; the 2nd impedance interface which is formed between scan signal source and the second scan switching part; capacitive touch detecting element which conducts electric signal processing for detecting variations of electric property related to impedance matching of scan signals of the first and second frequencies which respectively are approved in the first and second sensing strip antenna group at the same time; and the controller which calculates touch input coordinate of capacitive object by receiving input signals processed through detecting part of capacitive touch detecting variations of electric property related to impedance matching regarding the scan signals of the first and second frequencies as.
As an embodiment, the detecting part of capacitive touch includes voltage sensor and current sensor which are used to detect electric property of scan signal of capacitive touch.
As another embodiment, multiple sensing strip antenna has the first touch sense mode operating to detect touch input of capacitive object and the second touch sense mode operating to detect touch input of stylus pen embedding resonant circuit. Sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the first frequency in the first touch sense mode are output to the first scan switching part, and, at the same time, the scan sign of the 2nd frequency will be output in the 2nd scan switching part as and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output in the 1st and 2nd scan switching parts in order; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. Controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency are received.
As an another embodiment, touch mode switching part runs switching in a way that the 1st frequency signal in the 2nd touch sense mode does not pass through the 1st impedance interface and be output in order to the 2nd scan switching part.
In the embodiment above, power transmission antenna is included for transmitting power to stylus pen embedding resonant circuit, the multiple sensing strip antenna have the 1st touch sense mode running to detecting touch input of capacitive object and the 2nd touch sense mode running to detecting touch input of stylus pen. The sensing control circuit runs switching motion in a way that the scan signal of 1st touch sense mode is output in the 1st scan switching part and, at the same time, the scan signal of the 2nd frequency can be output in the 2nd scan switching part. In the 2nd touch sense mode includes touch mode switching part which runs switching motion to make the scan signal of the 1st frequency output in the power transmission antenna; and pen touch detection part where electric signal processing is performed to detect touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by detecting reception of radio frequency signal which is transmitted by resonated scan signal of the 1st frequency in resonant circuit of stylus pen by receiving input of processed signal through pen touch detection part.
As an embodiment, sensing control circuit includes: the 1st scan switching part for selective running the 1st sensing strip antenna group; the 2nd scan switching part for selective running of the 2nd sensing strip antenna group; the 1st impedance interface to be formed between scan signal source and the 1st scan switching part; capacitive touch detection part performing electric signal processing to detect variations of electric property related to impedance matching of scan signal of the 1st frequency which is loaded in the 1st sensing strip antenna group; the 2nd impedance interface connected between the 2nd scan switching part and capacitive touch detection part; and controller which calculates touch input coordinate of capacitive object by detecting variation of electric property related to impedance matching on scan signal of the 1st frequency according to touch of capacitive object after receiving signals which have been processed through capacitive touch detection part.
As an embodiment, capacitive touch detection part includes voltage sensor and current sensor for detecting electric property of capacitive touch scan signals.
As an embodiment, multiple sensing strip antenna have the 1st touch sense mode running for detecting touch input of capacitive object and the 2nd touch sense mode running for detecting touch input of stylus pen embedding resonant circuit. Sensing control circuit includes: touch mode switching part running switching motion to make scan signal of the first frequency input in the 2nd impedance interface and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output in the 1st and 2nd scan switching parts in order; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. Controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency are received.
As an another embodiment, touch mode switching part runs switching in a way that the 1st frequency signal in the 2nd touch sense mode does not pass through the 1st impedance interface and be output to the 1st scan switching part and 2nd scan switching part in order.
As another embodiment, power transmission antenna is included for transmit power to stylus pen embedding resonant circuit and multiple sensing strip antenna has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. Sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode is output to the 1st scan switching part, and, the scan sign of the 1st frequency output through the 2nd scan switching part will be input to the 2nd impedance interface and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output to the power transmission antenna; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an embodiment, coordinate input device includes: multiple sensing strip antenna including the 1st sensing strip antenna group for detecting the 1st coordinate in touch input coordinate and the 2nd sensing strip antenna group for detecting the 2nd coordinate in touch input coordinate; sensing panel including conductive wire including multiple sensing strip antenna and substrate where such conductive wire is attached with the glue; and sensing control circuit which supplies scan signals for detecting touch input coordinate of capacitive object to the multiple sensing strip antenna and calculate touch input coordinate based on the electric property related to impedance interface of scan signal which is generated to respond to touch input coordinate of capacitive object.
As an embodiment, the 1st and 2nd sensing strip antenna group includes different connected conductive wire and includes multiple taps connected to such conductive wire.
As an embodiment, sensing control circuit includes: the 1st scan switching part for selective running the 1st sensing strip antenna group; the 2nd scan switching part for selective running of the 2nd sensing strip antenna group; scan signal source generating scan signals of the 1st and the 2nd frequency; the 1st impedance interface to be formed between scan signal source and the 1st scan switching part; the 2nd impedance interface to be formed between scan signal source and the 2nd scan switching part; capacitive touch detection part performing electric signal processing to detect variations of electric property related to impedance matching of scan signal of the 1st and the 2nd frequency which is loaded in the 1st and the 2nd sensing strip antenna groups at the same time; and the controller which calculates touch input coordinate of capacitive object by detecting variation of electric property related to impedance matching on scan signal of the 1st and the 2nd frequencies according to touch of capacitive object after receiving signals which have been processed through capacitive touch detection part.
As an embodiment, capacitive touch detection part includes voltage sensor and current sensor for detecting electric property of capacitive touch scan signals.
As another embodiment, the multiple sensing strip antenna has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. Sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode be output to the 1st scan switching part, and, in the 2nd touch sense mode, the scan sign of the 1st frequency be output to the 1st and 2nd scan switching parts in order; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an another embodiment, touch mode switching part runs switching motion in a way that the 1st frequency signal in the 2nd touch sense mode does not pass through the 1st impedance interface and be output to the 1st scan switching part and 2nd scan switching part in order.
As an embodiment, power transmission antenna is included for transmit power to stylus pen embedding resonant circuit and multiple sensing strip antenna as has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. Sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode is output to the 1st scan switching part, and, at the same time, the scan sign of the 2nd frequency will be output to the 2nd scan switching part and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output to the power transmission antenna; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an embodiment, sensing control circuit includes: the 1st scan switching part for selective running the 1st sensing strip antenna group; the 2nd scan switching part for selective running of the 2nd sensing strip antenna group; scan signal source generating scan signals of the 1st frequency; the 1st impedance interface to be formed between scan signal source and the 1st scan switching part; capacitive touch detection part performing electric signal processing to detect variations of electric property related to impedance matching of scan signal of the 1st frequency which is loaded in the 1st sensing strip antenna groups at the same time; the 2nd impedance interface connected between the 2nd scan switching part and capacitive touch detection part; and the controller which calculates touch input coordinate of capacitive object by detecting variation of electric property related to impedance matching on scan signal of the 1st frequencies according to touch of capacitive object after receiving signals which have been processed through capacitive touch detection part.
As an embodiment, capacitive touch detection part includes voltage sensor and current sensor for detecting electric property of capacitive touch scan signals.
As another embodiment, the multiple sensing strip antenna has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. Sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode will be output to the 1st scan switching part, and, the scan signal of the 1st frequency to be output through the 2nd scan switching part will be input to the 2nd impedance interface, and, in the 2nd touch sense mode, the scan sign of the 1st frequency will be output to the 1st and 2nd scan switching parts in order; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an another embodiment, touch mode switching part runs switching motion in a way that the 1st frequency signal in the 2nd touch sense mode does not pass through the 1st impedance interface and be output to the 1st scan switching part and 2nd scan switching part in order.
As an embodiment, power transmission antenna is included for transmit power to stylus pen embedding resonant circuit and multiple sensing strip antenna as has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. Sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode be output to the 1st scan switching part, and the scan signal of the 1st frequency to be output through the 2nd scan switching part will be input to the 2nd impedance interface and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output to the power transmission antenna; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an embodiment, coordinate input device includes: sensing panel which is placed in the rear of display panel having multiple pixel to be driven to illustrate video images; multiple sensing strip antenna including the 1st sensing strip antenna group to be installed in sensing panel for detecting the 1st coordinate in touch input coordinate and the 2nd sensing strip antenna group for detecting the 2nd coordinate in touch input coordinate; and sensing control circuit which supplies scan signals for detecting touch input coordinate of capacitive object to the multiple sensing strip antenna for detecting touch input coordinate of capacitive object touching the front of display panel and calculates touch input coordinate based on the variation of electric property related to impedance interface of scan signal which is generated in respond to touch input coordinate of capacitive object.
As an embodiment, the sensing control circuit includes: the 1st scan switching part for selective running the 1st sensing strip antenna group; the 2nd scan switching part for selective running of the 2nd sensing strip antenna group; scan signal source generating scan signals of the 1st and 2nd frequency; the 1st impedance interface to be formed between scan signal source and the 1st scan switching part; the 2nd impedance interface to be formed between scan signal source and the 2nd scan switching part; capacitive touch detection part performing electric signal processing to detect variations of electric property related to impedance matching of scan signal of the 1st and 2nd frequencies which are loaded in the 1st and the 2nd sensing strip antenna groups at the same time; and the controller which calculates touch input coordinate of capacitive object by detecting variation of electric property related to impedance matching on scan signal of the 1st and the 2nd frequencies according to touch of capacitive object after receiving signals which have been processed through capacitive touch detection part.
As an embodiment, the capacitive touch detection part includes voltage sensor and current sensor for detecting electric property of capacitive touch scan signals.
As an embodiment, the multiple sensing strip antenna has the 1st touch sense mode running for detecting touch input of capacitive object and the 2nd touch sense mode running for detecting touch input of stylus pen embedding resonant circuit. The sensing control circuit includes: touch mode switching part running switching motion to make scan signal of the 1st frequency input in the 1st scan switching part and, at the same time, the scan signal of the 2nd frequency output to the 2nd scan switching part and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output in the 1st and 2nd scan switching parts in order; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency, are received.
As an another embodiment, the touch mode switching part runs switching motion in a way that the 1st frequency signal in the 2nd touch sense mode bypasses and does not pass through the 1st impedance interface and be output to the 1st scan switching part and 2nd scan switching part in order.
As an embodiment, power transmission antenna is included for transmit power to stylus pen embedding resonant circuit and the multiple sensing strip antenna as has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. The sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode be output to the 1st scan switching part and, at the same time, the scan signal of the 2nd frequency be output to the 2nd scan switching part and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output to the power transmission antenna; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an embodiment, the power transmission antenna as mentioned has a structure that it is installed inner side of external cover which will be installed in the edge if display panel and includes magnetic cover to be installed in order to cover the power transmission antenna.
As an embodiment, the sensing control circuit includes: the 1st scan switching part for selective running the 1st sensing strip antenna group; the 2nd scan switching part for selective running of the 2nd sensing strip antenna group; scan signal source generating scan signals of the 1st frequency; the 1st impedance interface to be formed between scan signal source and the 1st scan switching part; capacitive touch detection part performing electric signal processing to detect variations of electric property related to impedance matching of scan signal of the 1st frequency which is loaded in the 1st sensing strip antenna group at the same time; the 2nd impedance interface to be formed between scan signal source and the 2nd scan switching part; and the controller which calculates touch input coordinate of capacitive object by detecting variation of electric property related to impedance matching on scan signal of the 1st frequency according to touch of capacitive object after receiving signals which have been processed through capacitive touch detection part.
As an embodiment, the capacitive touch detection part includes voltage sensor and current sensor for detecting electric property of capacitive touch scan signals.
As an embodiment, the multiple sensing strip antenna has the 1st touch sense mode running for detecting touch input of capacitive object and the 2nd touch sense mode running for detecting touch input of stylus pen embedding resonant circuit. The sensing control circuit includes: touch mode switching part running switching motion to make scan signal of the 1st frequency input in the 1st scan switching part and, the scan signal of the 1st frequency output through the 2nd scan switching part input to the 2nd impedance interface and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output in the 1st and 2nd scan switching parts in order; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency, are received.
As an another embodiment, the touch mode switching part runs switching motion in a way that the 1st frequency signal in the 2nd touch sense mode does not pass through the 1st impedance interface and be output to the 1st scan switching part and 2nd scan switching part in order.
As an embodiment, power transmission antenna is included for transmit power to stylus pen embedding resonant circuit and the multiple sensing strip antenna as has the 1st touch sense mode operating to detect touch input of capacitive object and the 2nd touch sense mode operating to detect touch input of stylus pen. The sensing control circuit includes: touch mode switching part making switching motion so that scan signal of the 1st frequency in the 1st touch sense mode be output to the 1st scan switching part and, the scan signal of the 1st frequency output through the 2nd scan switching part input to the 2nd impedance interface and, in the 2nd touch sense mode, the scan signal of the 1st frequency will be output to the power transmission antenna; and pen touch detection part where electric signal processing is performed for detecting touch input coordinate of stylus pen by detecting electric signal from multiple sensing strip antenna in the 2nd touch sense mode. The controller calculates touch input coordinate of stylus pen by receiving signals which have been processed through pen touch detection part in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen resonant circuit.
As an embodiment, the power transmission antenna as mentioned has a structure that it is installed inner side of external cover which will be installed in the edge if display panel and includes magnetic cover to be installed in order to cover the power transmission antenna.
As an embodiment, sensing panel is installed either in front or in the rear of optical sheet of backlight unit illuminating the light toward display panel from the rear of display panel.
As an embodiment, sensing panel is installed either in front or in the rear of optical sheet of backlight unit illuminating the light toward display panel from the rear of display panel.
As an embodiment, shielding sheet for shielding magnetic interference between circuit board which is placed on the latter part of sensing panel.
As an embodiment, shielding sheet has a single or more than two separated shielding areas.
As an embodiment, shielding sheet includes magnet layer and carbon fiber layer which are formed on the board and in a side of the substrate.
As an embodiment, multiple sensing strip antenna forms conductive film by printing processing, vapor deposition or etching process on the surface of sensing panel board.
As an embodiment, conductive bezel trace which is formed in the bezel area of sensing panel is composed by attaching conductive wire printed and insulated.
As an embodiment, magnetic cover which is to be installed in bezel areas of dual sensing plate for covering bezel trace.
The coordinate input device of this invention having improved touch sense function can much improve touch sense performance by detecting variation of electric property related to impedance matching for scan signals and calculating touch input coordinate of capacitive object.
Exemplary embodiments of the present invention will be described with reference to the accompanying drawings in order to sufficiently understand the present invention. Exemplary embodiments of the present invention may be modified into several forms, and it is not to be interpreted that the scope of the present invention is limited to exemplary embodiments described in detail below. Exemplary embodiments are provided in order to completely explain the present invention to those skilled in the art. Therefore, shapes, or the like, of components in the accompanying drawings may be exaggerated for clarity. It is to be noted that the same components will be denoted by the same reference numerals throughout the accompanying drawings. A detailed description for the well-known functions and configurations that may unnecessarily make the gist of the present invention unclear will be omitted.
Referring to
The coordinate input device (100) of this invention provides improved touch sense performance by calculating touch input coordinate based on variations of electric property related to impedance matching of scan signals. In addition, touch input of stylus pen (230) embedding resonant circuit (232) can be also composited enough to detect touch input. In other words, a sensing control circuit (300) can be composited so as to detect all touch input of capacitive object (220) and stylus pen (230) by using single sensing panel (200) without installment of separate digitizer panel for detecting touch input of stylus pen (230).
Sensing pane (200) has multiple sensing strip antenna (210) including the 1st sensing strip antenna group (212) for detecting Y coordinate in touch input coordinate and the 2nd sensing strip antenna group (214) for detecting X coordinate in touch input coordinate. Sensing control circuit (300) has the 1st and 2nd scan switching unit (312, 314), scan signal supply (320), the 1st and 2nd impedance matching part (332, 334), capacitive touch detection part (350), and controller (370). And pen touch detection part (360) may be added for detecting touch input of stylus pen (230).
The 1st scan switching unit (312) makes scan signal selectively supplies in the 1st sensing strip antenna group (212). The 2nd scan switching unit (314) makes scan signal selectively supplies in the 2nd sensing strip antenna group (214). Scan signal supply (320) generates scan signals of the 1st frequency and 2nd frequency. Scan signal supply (320) has the 1st and 2nd frequency sources (322, 324) for generating scan signals of the 1st and 2nd frequencies. Circuit may be composed so that scan signal supply (320) can supply the scan signals of the 1st and 2nd frequencies by using single frequency source generating signals. Scan signals the 1st and 2nd frequencies may be the same or different frequency. The wave form of those frequencies may be used various wave forms including sine wave, chopping wave and square wave.
The 1st impedance matching part (332) is composed between scan signal supply (320) and the 1st scan switching part (321) and the 2nd impedance matching part (334) is composed between scan signal supply (320) and the 2nd scan switching unit (314). The 1st and 2nd impedance matching part (332, 334) is composed between scan signal supply (320) and the 1st and 2nd sensing strip antenna group (212, 214) so as to perform impedance matching.
Capacitive touch detection part (350) performs electric signal processing in order to detect variation of electric property related to impedance matching of scan signals of the 1st and 2nd frequencies which are loaded respectively at the same time in the 1st and 2nd sensing strip antenna group (212, 214) and provide it to the host (400).
In order to detect all the touching input of capacitive object (220) and stylus pen (230), multiple sensing strip antenna (210) have the 1st touch sense mode for detecting touch input of capacitive object (220) and the 2nd touch sense mode for detecting touch input of stylus pen (230). And sensing control circuit (300) has touch mode switching part (340) so as to allow scan signals selectively supplied to sensing panel (200) according to the 1st and 2nd sense modes. Controller (370) control switching motion of scan signal supply (320), touch mode switching part (340), and the 1st and 2nd scan switching unit (312, 314).
Touch mode switching part (340) makes switching motion so that signal of the 1st frequency in the 1st touch sense mode be output to the 1st scan switching unit (312) and, at the same time, signal of the 2nd frequency in the 1st touch sense mode be output to the 2nd scan switching unit (314). Touch mode switching part (340) makes switching motion so that, in the 2nd touch sense detection mode, the scan signal of the 1st frequency will be output to the 1st and 2nd scan switching unit (312, 314) in order. Pen touch detection part (360) performs electric signal processing for detecting touch input coordinate of stylus pen (230) by detecting electric signal from multiple sensing strip antenna (210) in the 2nd touch sense mode. The controller (370) calculates touch input coordinate of stylus pen (230) by receiving signals which have been processed through pen touch detection part (360) in the 2nd touch sense mode and detecting whether radio frequency signals, which is transmitted from resonating of scan signals of the 1st frequency in stylus pen (230) resonant circuit (232).
Referring to
Likewise, in the 1st touch sense detection mode, the 1st scan switching part makes switching motion in order and scan signals of the 1st frequency will be input to a certain sensing strip antenna (212-1) which belongs to the 1st sensing strip antenna group (212). Besides, while the 2nd scan switching unit (314) makes switching motion in order and scan signals of the 1st frequency will be input to a certain sensing strip antenna (214-1) which belongs to the 1st sensing strip antenna group (214).
At this point, capacitive touch detection part (350) performs electric signal processing in order to detect variation of electric property related to impedance matching of scan signals of the 1st and 2nd frequencies which are loaded respectively at the same time in the 1st and 2nd sensing strip antenna group (212, 214) and provide it to the host (400).
Referring to
As a way of detecting variation of electric property, such variation may be measured by controller (370) from measuring voltage value and current value measured by voltage sensor (352) and current sensor (354). Or, a circuit may be organized to compare electric properties in capacity touch detection part so that the result of such comparison can be send to the controller. For example, by installing differential amplifier, which can compare input and output of scan signals, compared signals.
Referring to
Here, making capacity object have maximum value while capacitive object is not touched means that: initial design is to be made to make it have maximum value and it will have smaller value when a touch is made by capacitive object because the condition of resonance cannot be satisfied. In addition, making it have maximum value while capacitive object is touched means that: resonant design is to be made by measuring capacitive capacity of capacitive object and, when a touch is generated by capacitive object, such condition is satisfied and it has maximum value.
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Multiple sensing strip antenna (210) in the 2nd touch detection mode has sending antenna function and receiving antenna function. In other words, multiple sensing strip antenna (210) is driven in order according to scan motion and output scan signal of the 1 frequency wirelessly and moves to receive radio signals which are resonated and sent in resonance circuit (232) of stylus pen (230. By receiving processed signals through pen touch detection part, Controller (370) detects the receipt or not of radio frequency signals which are transmitted by resonated scan signals of the 1st frequency in resonant circuit (232) of stylus pen (230) and calculates touch input coordinate of stylus pen.
Likewise, coordinate input device (100) of this invention can realize improved touch detection performance by detecting touch input of capacitive object (220) by using impedance matching circuit. Also, by using conversion function of the single and same sensing panel and touch detection mode, it can detect all the touch input of capacitive object (220) and touch input of stylus pen (230) embedding resonant circuit (232).
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In
Likewise, if the sensing strip antenna (210) is organized by using connected conductive wire and multiple taps in a way that such antenna is glued to the substrate, costs for materials and manufacture can be significantly saved. Besides, the resistance of sensing strip antenna (210) can be lowered and sensing level can be improved.
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If it is organized only for detecting touch input of capacitive object (200), the coordinate input device (100) of this invention may be called as touch screen device, term commonly used. And, if it is organized to detect all the touch input from capacitive object (220) and stylus pen (230), it can be named as digitizer (or tablet). All the devices such as touch screen and tablet are devices for coordinate input and they can be used to name the coordinate input device of this invention.
The embodiments of coordinate input device of this invention, which has improved touch detection performance as explained above are only examples and any person having common knowledge of the technical field which this invention belongs to would be able to be well aware that various modification and equivalent other embodiments are available from them. Thus, he or she would be able to understand that this invention is not to be limited to the form as described in the detailed explanation above. Thus, the scope of genuine technical protection of this invention must be decided by the technical idea within the scope of patent Claim as attached hereto. In addition, it must be considered that this invention includes all its derivatives, equivalence and substitutes within the spirit of this invention to be defined by such Claim scope attached.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2014-0078449 | Jun 2014 | KR | national |
| 10-2014-0078492 | Jun 2014 | KR | national |
| 10-2014-0078510 | Jun 2014 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2015/006484 | 6/25/2015 | WO | 00 |
