TWI514765B - Method for generating touch signal and touch display - Google Patents

Description

Touch signal generating method and touch display

The present disclosure relates to a signal generating method and a display, and more particularly to a touch signal generating method and a touch display.

Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 1 is a waveform diagram of a touch signal generated when a conventional touch signal generating circuit is touched by a touch panel, and FIG. 2 is a conventional diagram. The waveform of the touch signal generated by the touch signal generating circuit when the touch panel is not touched. When the touch panel is touched by the user, the touch signal TS1 is suddenly large and small, and is quite unstable. When the touch panel is not touched by the user, the touch signal TS1 is also suddenly large and small, and is quite unstable.

One of the reasons for the instability of the touch signal TS1 is that when the pixel is charged and discharged, noise is formed to the integrator of the conventional touch signal generating circuit. The noise will cause the integral curve to jump up or down, causing the touch signal TS1 to flutter.

The disclosure relates to a touch signal generating method and a touch display.

According to the disclosure, a touch signal generating method is proposed. The touch signal generating method includes: receiving a transfer pulse (TP); controlling the integrator to shift the pulse to a non-edge trigger according to the switch control signal The time period is sensed to generate an integral signal; and the touch signal is output according to the integral signal.

According to the disclosure, a touch display is proposed. The touch display includes a touch signal generating circuit, and the touch signal generating circuit includes an integrator, a sensing control circuit, and a sample and hold circuit. The sense control circuit receives the shift pulse and generates a switch control signal. The sensing control circuit controls the integrator to sense the period during which the shift pulse is non-edge triggered according to the switch control signal to generate an integral signal. The sample and hold circuit outputs a touch signal according to the integral signal.

In order to better understand the above and other aspects of the present disclosure, the following specific embodiments, together with the accompanying drawings, are described in detail below:

First embodiment

Please refer to FIG. 3, FIG. 4 and FIG. 5 simultaneously. FIG. 3 is a schematic diagram of a signal generating circuit according to the first embodiment, and FIG. 4 is a touch according to the first embodiment. A flow chart of the signal generating method, and FIG. 5 is a signal waveform diagram according to the first embodiment. The touch display includes a touch signal generating circuit 3, and the touch signal generating circuit 3 includes an integrator 31, a sensing control circuit 32, and a sample and hold circuit 33. The integrator 31 includes an operational amplifier 311, an integrating capacitor Cf, and a switch SW. The operational amplifier 311 is electrically connected to the contact electrode 2. When the user touches the touch electrode 2, the integrator 31 senses the change of the capacitance and outputs the corresponding integral signal IS. The switch SW is turned on or turned off by the switch control signal Vref. When the switch SW is turned off, the operational amplifier 311 is combined with the integrating capacitor Cf to generate the integrated signal IS. Conversely, When the switch SW is turned on, the integrator 31 stops generating the integral signal IS.

The touch signal generating method can be applied to the touch signal generating circuit 3 described above, and includes the following steps: First, as shown in step 41, the sensing control circuit 32 receives the shifting pulse TP. The source driver starts to output the data signal Data after receiving the shift pulse TP outputted by the timing controller. When the pixel is charged and discharged according to the data signal Data, the noise NS is generated correspondingly. After the output enable signal OE is output to the gate driver, the gate driver starts outputting the corresponding scan signal Gate according to the output enable signal OE. The gate clock signal CPV provides a clock signal to the gate driver. The gate driver controls the waveform of the scan signal Gate according to the gate voltage control signal GVON and the gate voltage control signal GVOFF.

Then, as shown in step 42, the sensing control circuit 32 controls the integrator 31 to sense the period during which the shift pulse TP is non-edge triggered according to the switch control signal Vref to generate the integrated signal IS. Then, as shown in step 43, the sample and hold circuit 33 outputs the touch signal TS2 based on the integral signal IS. Since the sensing control circuit 32 can appropriately control the sensing time of the integrator 31, the interference of the noise to the integrator 31 can be avoided, and the sampling and holding circuit 33 can be provided to provide the stable touch signal TS2.

Further, the touch signal generating circuit 3 receives a sync signal, and the touch signal generating circuit 3 generates a switch control signal according to the trigger edge of the sync signal. The trigger edge of the sync signal is, for example, the rising trigger edge of the output enable signal OE or the gate voltage control signal GVON. Alternatively, the trigger edge of the sync signal is, for example, a falling trigger signal edge of the gate clock signal CPV or the gate voltage control signal GVOFF. In other words, the touch signal generating circuit 3 can sense noise by avoiding the trigger edge of the shift pulse TP to reduce noise. interference.

Second embodiment

Please refer to FIG. 5 and FIG. 6 simultaneously. FIG. 6 is a schematic diagram showing a sensing control circuit according to the second embodiment. In addition, the touch signal generating circuit 3 can also receive the synchronization signal, and then count a delay time after the synchronization signal is generated to generate the switch control signal. The synchronization signal is, for example, an output enable signal OE, a gate voltage control signal GVON, a gate voltage control signal GVOFF, a shift pulse TP, or a gate clock signal CPV. The touch signal generating circuit 3 counts a delay time after the synchronization signal is generated to avoid the trigger edge of the shift pulse TP. In other words, the touch signal generating circuit 3 can sense noise by avoiding the trigger edge of the shift pulse TP to reduce noise interference.

For example, the sensing control circuit 32 further includes a counter 321 and an open signal generator 322. The counter 321 counts a delay time Td after the shift pulse TP is generated. The open signal generator 322 generates the switch control signal Vref after the delay time Td is counted.

The source driver starts to output the data signal Data after receiving the shift pulse TP outputted by the timing controller. When the pixel is charged and discharged according to the data signal Data, the noise NS is generated correspondingly. In order to prevent the noise NS from affecting the touch signal, the switch control signal Vref controls the integrator to sense when the shift pulse TP is non-edge triggered to generate the integrated signal IS. In other words, the sensing control circuit 32 can control the integrator to sense at an appropriate sensing time to avoid interference by the noise NS.

Third embodiment

Please refer to FIG. 5 and FIG. 7 at the same time. FIG. 7 is a schematic diagram showing a signal generating circuit according to the third embodiment. The third embodiment is mainly different from the first embodiment in that the sensing control circuit 32 of the touch signal generating circuit 8 generates the switching control signal Vref according to the synchronization signal Sync1 and the synchronization signal Sync2. The synchronization signal Sync1 is, for example, a shift pulse TP outputted by the timing controller, an output enable signal OE, a gate clock signal CPV, a gate voltage control signal GVON or a gate voltage control signal GVOFF, and the synchronization signal Sync2 is, for example, timing control. The polarity signal POL of the output.

Please refer to FIG. 8. FIG. 8 is a waveform diagram of an integrated signal, a polarity signal, an output enable signal, and a touch signal according to the third embodiment. The touch signal TS2 may have different offset levels depending on the polarity. In order to further prevent the touch signal TS2 from being affected by the polarity, the sensing control circuit can control the integrator to sense when the same polarity is used to prevent the touch signal TS2 from being affected. Further, the sensing control circuit 32 receives the polarity signal POL and enables the switch control signal Vref to be in the same polarity according to the polarity signal POL.

Fourth embodiment

Please refer to FIG. 8 and FIG. 9 at the same time. FIG. 9 is a schematic diagram showing a signal generating circuit according to the fourth embodiment. The fourth embodiment is mainly different from the first embodiment in that the touch signal generating circuit 9 further includes a polarity maintaining circuit 94. The polarity maintaining circuit 94 receives the switch control signal Vref and generates a polarity control signal of the same polarity according to the switch control signal Vref. The timing controller controls the signal according to the polarity control signal When Vref is enabled, the polarity signal POL of the same polarity is output.

In summary, although the disclosure has been disclosed in the above embodiments, it is not intended to limit the disclosure. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure. Therefore, the scope of protection of this disclosure is subject to the definition of the scope of the appended claims.

2‧‧‧Contact electrode

3, 8, 9‧‧‧ touch signal generation circuit

31‧‧‧ integrator

32, 82‧‧‧Sense Control Circuit

33‧‧‧Sampling and holding circuit

41~43‧‧‧Steps

94‧‧‧Polarity maintaining circuit

311‧‧‧Operational Amplifier

321‧‧‧ counter

322‧‧‧Switch signal generator

Cf‧‧‧ integral capacitor

CPV‧‧‧ gate clock signal

Data‧‧‧Information Signal

GVON, GVOFF‧‧‧ gate voltage control signal

NS‧‧‧ noise

OE‧‧‧ output enable signal

POL‧‧‧polar signal

TS1, TS2‧‧‧ touch signals

TP‧‧‧shift pulse

Td‧‧‧Delayed time

Sync1, Sync2‧‧‧ sync signal

SW‧‧ switch

Vref‧‧‧ switch control signal

FIG. 1 is a waveform diagram of a touch signal generated when a touch panel is touched by a conventional touch signal generating circuit.

FIG. 2 is a waveform diagram of a touch signal generated by a conventional touch signal generating circuit when the touch panel is not touched.

Figure 3 is a schematic diagram showing the signal generating circuit in accordance with the first embodiment.

FIG. 4 is a flow chart showing a method for generating a touch signal according to the first embodiment.

Fig. 5 is a diagram showing a signal waveform according to the first embodiment.

Figure 6 is a schematic diagram showing a sensing control circuit in accordance with a second embodiment.

Figure 7 is a diagram showing a signal generating circuit in accordance with a third embodiment.

FIG. 8 is a waveform diagram of an integrated signal, a polarity signal, an output enable signal, and a touch signal according to the third embodiment.

Figure 9 is a diagram showing a signal generating circuit in accordance with a fourth embodiment.

41~43‧‧‧Steps

Claims (12)

A touch signal generating method includes: receiving a transfer pulse (TP); controlling an integrator according to a switch control signal to sense when the transfer pulse is non-edge triggered to generate an integration signal; Outputting a touch signal according to the integral signal; receiving a polarity signal; and enabling the switch control signal to be in the same polarity according to the polarity signal. The method for generating a touch signal according to claim 1, further comprising: receiving a synchronization signal; wherein a delay time is counted after the synchronization signal is generated to generate the switch control signal. The method for generating a touch signal according to the second aspect of the invention, wherein the synchronization signal is an output enable (OE) signal, a gate voltage control signal, a transfer pulse or a gate clock signal. The method for generating a touch signal according to claim 1, further comprising: receiving a synchronization signal; wherein the switch control signal is generated according to a trigger edge of the synchronization signal. The method for generating a touch signal according to claim 4, wherein the synchronization signal is an output enable (OE) signal or a gate voltage control signal. A touch signal generating method includes: receiving a transfer pulse (TP); controlling an integrator according to a switch control signal to sense when the transfer pulse is non-edge triggered to generate an integration signal; Outputting a touch signal according to the integral signal; generating a polarity control signal according to the switch control signal; and outputting a polarity signal of the same polarity when the switch control signal is enabled according to the polarity control signal. A touch display includes: a touch signal generating circuit comprising: an integrator; and a sensing control circuit for receiving a transfer pulse (TP) and generating a switch control signal, the sensing control The circuit controls the integrator to sense when the shift pulse is non-edge triggered according to the switch control signal to generate an integral signal; and a sample hold circuit for outputting a touch signal according to the integrated signal; The touch signal generating circuit receives a polarity signal, and the touch signal generating circuit enables the switch control signal to be in the same polarity according to the polarity signal. The touch display device of claim 7, wherein the touch signal generating circuit receives a synchronization signal, and the touch signal generating circuit further comprises: a counter for counting one after the synchronization signal is generated Delay time; An open signal generator generates the switch control signal after the delay time is counted. The touch display device of claim 8, wherein the synchronization signal is an output enable (OE) signal, a gate voltage control signal, a transfer pulse or a gate clock signal. The touch display device of claim 7, wherein the touch signal generating circuit receives a synchronization signal, and the touch signal generating circuit generates an open control signal according to the trigger edge of the synchronous signal. The touch display of claim 10, wherein the synchronization signal is a trigger edge or a gate voltage control signal of an Output Enable (OE) signal. A touch display includes: a touch signal generating circuit comprising: an integrator; and a sensing control circuit for receiving a transfer pulse (TP) and generating a switch control signal, the sensing control The circuit controls the integrator to sense when the shift pulse is non-edge triggered according to the switch control signal to generate an integral signal; and a sample hold circuit for outputting a touch signal according to the integrated signal; The polarity maintaining circuit is configured to receive the switch control signal, and generate a polarity control signal of the same polarity according to the switch control signal.