Abstract:
Provided is a new capacitive touch detection device, detection method, and touch screen panel for detecting a touch signal by detecting a voltage difference of a sensor pattern from a driving voltage applied by an auxiliary capacitor, and to a display device having a built-in capacitive touch screen. A capacitive touch detection device includes: a sensor pattern (10) forming a touch capacitance (Ct) in between a touch input device and the sensor pattern; an auxiliary capacitor (Caux) connected on one side to the sensor pattern (10) and having a driving voltage for touch detection applied to the other side thereof; a charging unit (12) for providing pre-charge signals to the touch capacitance (Ct) and the auxiliary capacitor (Caux); and a touch detection sensor (14) which is connected to the sensor pattern (10) and which detects a touch signal by detecting a voltage difference in the sensor pattern (10) when the touch capacitance (Ct) is added to the auxiliary capacitor (Caux) according to a touch of a touch input instrument. Effects of parasitic capacitance generated due to noise, coupling phenomena and other factors are minimized, to thus stably acquire touch signals.
Abstract:
Methods of preparing reduced graphene oxide and reduced graphene oxide-polymer composites. The methods include covalently binding a halogen-substituted aromatic compounds to a graphene oxide and heat treating the graphene oxide with the halogen-substituted aromatic compounds covalently bound thereto at a low temperature, for example, 450° C. or less. By using the methods, reduced graphene oxide and reduced graphene oxide-polymer composites that have high electrical conductivities (e.g., 30,000 S/m or more) may be obtained.
Abstract:
An induction heating cooker includes a plurality of heating coils to heat a container, an inverter having a plurality of switching elements to be operated such that a high-frequency voltage is selectively supplied to the plurality of heating coils, and a control unit to control the operations of the plurality of switching elements such that the high-frequency voltage is time-divisionally supplied to a heating coil, on which the container is positioned, among the plurality of heating coils. By this configuration, it is possible to reduce the number of inverters and manufacturing costs. In addition, since the thickness of the cooker is reduced, it is possible to reduce the overall size of the cooker.
Abstract:
The present invention presents a method for quickly transmitting and receiving pen Tx and Rx signals by reconfiguring a CDA column consisting of a large number of CDAs into a CDA column consisting of one CDA, and reducing the time of the process by detecting objects by quick search with the same CDA column, thereby preventing loss of signals that may occur in Tx/Rx with the pen and reducing current consumption.
Abstract:
The present invention relates to a method of configuring a sensor pattern that linearly detects touch signals based on changes in the active area when a pen touches the ODA that constitutes the object detection device of the present invention installed on the conductive surface. It also pertains to a method of constructing a sensor pattern that minimizes moiré interference with the display device. As a result, the readability of pen-written characters is enhanced, and visibility is improved due to moiré avoidance.
Abstract:
The present invention can form a stable system by minimizing the sensitivity distribution of the system caused by the area difference of the object to be detected. This is achieved by adjusting the density of the empty holes formed in the object to be detected, thereby maintaining the effective area of the object to be detected constant.
Abstract:
The present invention relates to a novel means and a novel method for detecting a capacitance connected to AC power, which detect a sensor capacitance on the basis of a charge sharing phenomenon occurring due to a difference between voltages applied to a sensor capacitor and an auxiliary capacitor connected to a detection system when an AC voltage applied to the detection system alternates. According to the present invention, since the sensitivity of a signal detected by a detection system is improved, a magnitude and a change amount of a sensor capacitance are stably acquired.
Abstract:
Provided is a touch detection device, touch detection method, and touch screen panel, which detects a touch signal by detecting a driving back phenomenon occurring in a touch pad by a driving voltage applied to a driving capacitor, and a display device with a built-in touch screen panel. The touch detection device that is added on top of a display device and detects occurrence of a touch capacitance (Ct) by an approach of a bodily finger (25) or a touch input instrument such as a conductor similar to the bodily finger, the touch detection device comprising: a touch pad (10) that forms the touch capacitance (Ct) between the touch input instrument and the touch pad; a driving capacitor (Cdrv) whose one side is connected to the touch pad (10) and to the other side of which a driving voltage for detection of a touch input is applied; a common voltage detector that detects a common voltage generated from the display device; a driving voltage generator that generates the driving voltage in synchronization with the common voltage; and a touch detector that is connected to the touch pad (10), and that detects a touch signal by using a driving back phenomenon when the touch capacitance (Ct) is added to the driving capacitor (Cdrv) according to occurrence or non-occurrence of a touch in the touch input instrument. A touch signal is detected while avoiding a point in time of a change of a common voltage state, and a driving voltage is applied through a driving capacitor connected to a touch detector, to thus detect whether or not a driving back phenomenon occurs in the touch detector and to thereby acquire a touch signal. Accordingly, an influence due to parasitic capacitance generated by noise, coupling phenomenon or other factors is minimized, to thus acquire a touch signal stably.
Abstract:
An induction heating cooker and a control method thereof that stably adjust power of a cooking coil when a plurality of containers having different cooking conditions is placed on the cooking coil includes a plurality of heating coils disposed below a cooking plate and a controller to determine whether a container is placed on the heating coils, wherein the controller determines whether a plurality of containers is placed on one of the heating coils and, when the containers are placed on one of the heating coils, adjusts a power of the heating coil on which the containers are placed based on powers of other heating coils occupied by the containers. Cooking using a plurality of containers is stably performed based on user intention even when cooking conditions of the containers placed on a heating coil differ.
Abstract:
An induction heating cooker and a control method thereof that prevents the occurrence of an error caused during recognition of a container in the induction heating cooker that performs cooking regardless of where the container is placed on a cooking plate includes a plurality of heating coils disposed below a cooking plate, current detectors to detect values of current flowing in the respective heating coils, and a controller to determine whether a container is placed on the respective heating coils based on the detected current values of the heating coils and change amounts of the current values.