This application relates to the field of touch technology, and in particular relates to a touch driving circuit, a touch component, and a display touch device.
An AMOLED display technology is a very competitive display technology in the future, including an OLED display panel, and a touch panel on an upper surface of the OLED display panel. The touch panel includes a plurality of touch electrodes. In order to make the AMOLED display thinner and lighter, the touch electrodes are directly mounted on cathodes of a package layer, to achieve integration of a touch display. However, when the touch electrodes are closed to the cathodes, the coupling capacitance between the touch electrodes and the cathodes may increase, so that the amount of charges flowing from the touch electrodes to the cathodes may be excessive. As a result, when the human finger touches the OLED display panel, the amount of change in the capacitance of the touch electrode is too small, thereby affecting the touch performance.
The present disclosure relates to a touch driving circuit capable of reducing the amount of charges flowing from the touch electrode to the cathode.
For purposes of implementing the present application, the present application provides the following technical solutions:
In a first aspect, the present application provides a touch driving circuit for driving an OLED touch panel. The touch driving circuit includes a touch chip and a regulation voltage generating circuit. The touch chip includes a first voltage generating circuit. The first voltage generating circuit generates first voltage signals, and the first voltage signals is provided to an emitter electrode of the OLED touch panel. The regulation voltage generating circuit generates a regulation voltage. The regulation voltage having the same voltage polarity as a cathode voltage loaded at the cathode in the OLED touch panel, and the regulation voltage is provided to the emitter electrode.
In a first possible implementation of the first aspect, the regulation voltage is the same as the cathode voltage loaded at the cathode.
In a second possible implementation of the first aspect, the touch chip includes an adder circuit. The cathode is electrically connected to the adder circuit and the cathode voltage is used as the regulation voltage.
In a second aspect, the present application provides a touch component. The touch component includes a touch driving circuit and a touch display panel. The touch driving circuit includes a touch chip and a regulation voltage generating circuit. The touch display panel includes a cathode, an emitter electrode, and a receiver electrode. The touch chip includes a first voltage generating circuit. A first coupling capacitor is formed between the emitter electrode and the receiver electrode, a second coupling capacitor is formed between the emitter electrode and the cathode, and a third coupling capacitor is formed between the receiver electrode and the cathode. The first voltage generating circuit outputs first voltage signals to the emitter electrode to charge the first coupling capacitor, the second coupling capacitor, and the third coupling capacitor. The regulation voltage generating circuit generates a regulation voltage that is provided to the emitter electrode, and the regulation voltage having the same voltage polarity as a cathode voltage loaded at the cathode.
In a first possible implementation of the second aspect, the regulation voltage is the same as the cathode voltage loaded at the cathode.
In a second possible implementation of the second aspect, the touch chip includes an adder circuit, the cathode is electrically connected to the adder circuit, and the cathode voltage is used as the adjusting voltage.
In a third aspect, the present application further provides a touch display device comprising a touch driving circuit implemented in any implementation of the first aspect.
The beneficial effects of the present application:
The touch driving circuit provided in the present application includes the regulation voltage generating circuit to generate the regulation voltage.
The regulation voltage having the same voltage polarity as the cathode voltage, and the regulation voltage is provided to the emitter electrode. Therefore, most of the cathode voltage are cancelled out, and the amount of charges flowing from the emitter electrode and the receiver electrode to the cathode is reduced, thereby improving the touch performance.
In order to more clearly illustrate the embodiments of the present disclosure or prior art solutions, the drawings used in the description of the embodiments or prior art will be briefly described below. The drawings are merely some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings based on these drawings without any creative work.
Following embodiments of the invention will now be described in detail hereinafter with reference to the accompanying drawings.
The touch driving circuit provided by this application can be applied to display touch devices such as smart phones, tablet computers, mobile assistants, conference presentation devices, and the like.
With reference to
With reference to
With reference to
The touch driving circuit provided in the present application includes the regulation voltage generating circuit 50 to generate the regulation voltage. The regulation voltage having the same voltage polarity as the cathode voltage, and the regulation voltage is provided to the emitter electrode. Therefore, most the cathode voltage are cancelled out, and the amount of charges flowing from the emitter electrode to the cathode and the amount of charges flowing from the receiver electrode to the cathode are respectively reduced. Since the capacitances of the second coupling capacitor Ca and the capacitances of the third coupling capacitor Cb are stationary, when the first voltage generating circuit 11 charges the second coupling capacitor Ca and the third coupling capacitor Cb, the voltage between the second coupling capacitor Ca and the third coupling of the capacitor Cb is reduced, so that the amount of charges flowing from the emitter electrode 15 and the receiver electrode 25 to the cathode 100 is reduced, thereby improving the touch performance.
The regulation voltage generating circuit 11 may be provided individually, or the regulation voltage generating circuit 11 may be provided in a driving circuit of an OLED (not shown). The present application is not limited specifically an internal structure of the regulation voltage generating circuit 11.
In one embodiment, the regulation voltage is the same as the cathode voltage loaded at the cathode 100. Therefore, the cathode voltage is completely cancelled, and the voltage between the emitter electrode 15 and the cathode 100 is zero. Then, the amount of charges flowing from the emitter electrode 15 to the cathode 100 and the amount of charges flowing from the receiver electrode 25 to the cathode 100 are respectively minimized, and further improving the touch performance.
With reference to
The function of the adder circuit 12 loads a voltage on another voltage. In this embodiment, the regulation voltage is added on the first voltage signals of the touch chip 10. This application does not limit the specific structure of the adder circuit 12 as long as the adder circuit 12 can performance the above function.
In one embodiment, with reference to
The adder circuit 12 in this embodiment functions to add the regulation voltage signal to the first voltage signals of the touch control chip 10.
In one embodiment, a charge process of the touch driving circuit to charge the first coupling capacitor Cx, the second coupling capacitor Ca, and the third coupling capacitor Cb is the integration process. A voltage between two terminals of the first coupling capacitor Cx, a voltage between two terminals of the second coupling capacitor Ca. and a voltage between two terminals of the third coupling capacitor Cb respectively change with time, until the first coupling capacitor Cx, the second coupling capacitor Ca, and the third coupling capacitor Cb are charged saturation.
Specifically a cathode voltage value on the capacitor is V0, an ending voltage when a capacitor is fully charged is Vu, and a voltage value on the capacitor at time t is Vt. A rated voltage of the touch chip 10 is E, a resistance of a circuit is R, and a capacitance of the capacitor is C.
Then, Vt=V0+(Vu−V0)*[1−exp(−t/RC)]
When V0=0, the charging limit Vu=E,
Charge amount Q=E*C(1−e{circumflex over ( )}(−t/RC))
It should be appreciated that C is a total capacitance of the circuit. In the present embodiment, the total amount of charges of the circuit Q=Qx+Qa+Qb. Wherein Qx is the amount of charges of the first coupling capacitor Cx, Qa is the amount of charges of the second coupling capacitor Ca, and Qb is the amount of charges of the third coupling capacitor Qb. Then Qa=E*Ca(1−e{circumflex over ( )}(−t/RCx)). Qx and Qb can be obtained with a similar formula.
In one embodiment, the emitter electrode 15 includes a first impedance Rtx, and the receiver electrode 25 includes a second impedance Rrx. When the first coupling capacitor Cx, the second coupling capacitor Ca, and the third coupling capacitor Cb are fully charged, a voltage of the first coupling capacitor Cx, a voltage of the second coupling capacitor Ca, and a voltage of the third coupling capacitor Cb are respectively less than the high level voltage of the first voltage signals (the square wave signal) generated by the first voltage generating circuit 11.
Since the impedance will result in the loss of a part of the voltage, when the capacitor is charged to t=3RC, the voltage of the capacitor=0.95E is considered to be saturated. That is, Q=0.95E*C. The high level voltage of the first voltage signals (the square wave signal) generated by the first voltage generating circuit 11 is the rated voltage E. Because of the loss, the voltage of the capacitor is smaller than the voltage output by the touch chip 10.
With reference to
In one embodiment, the regulation voltage is the same as the cathode voltage loaded at the cathode 100.
In one embodiment, the touch chip 10 includes an adder circuit 12, the cathode 100 is electrically connected to the adder circuit 12, and the cathode voltage is used as the regulation voltage.
With reference to
configuring a touch configuration chip 10 and a regulation voltage generating circuit 50; wherein the touch chip 10 includes a first voltage generating circuit 11, the first voltage generating circuit 11 generates first voltage signals and provides the first voltage signals to an emitter electrode 15 of the OLED touch panel;
wherein regulation voltage generating circuit 50 generates an regulation voltage, the regulation voltage has the same voltage polarity as the cathode voltage loaded at the cathode 100 in the OLED touch panel, and the regulation voltage is provided to the emitting electrode 15.
In one embodiment, the regulation voltage is set to be the same as the cathode voltage loaded at the cathode 100.
In an embodiment, the touch chip 10 includes an adder circuit 12. The adder circuit 12 is electrically connected to the cathode 100, and the cathode voltage is used as the regulation voltage.
The above description is merely the embodiments in the present disclosure, the claim is not limited to the description thereby. The equivalent structure or changing of the process of the content of the description and the figures, or to implement to other technical field directly or indirectly should be included in the claim.
Number | Date | Country | Kind |
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201810064389.4 | Jan 2018 | CN | national |
This application is a continuing application of PCT Patent Application No. PCT/CN2018/076340, entitled “TOUCH DRIVING CIRCUIT, TOUCH COMPONENT, TOUCH DRIVING METHOD, AND DISPLAY TOUCH DEVICE”, filed on Feb. 11, 2018, which claims priority to Chinese Patent Application No. 201810064389.4, filed on Jan. 23, 2018, both of which are hereby incorporated in its entireties by reference.
Number | Date | Country | |
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Parent | PCT/CN2018/076340 | Feb 2018 | US |
Child | 16034851 | US |