TOUCH DISPLAY CONTROL CIRCUIT, CONTROL METHOD AND ELECTRONIC DEVICE
A touch display control circuit, a control method, and an electronic device are provided. The touch display control circuit is configured to drive STN-LCD screens, TN-LCD screens and CSTN-LCD screens. The touch display control circuit includes a display driving circuit and a touch detection circuit. The display driving circuit includes a signal transmission line, multiple groups of signal selection circuits and a reference voltage generation circuit. The signal transmission line is configured to transmit a gate signal and a common signal. The signal selection circuit is configured to select a preset control voltage based on display control timing or touch control timing. The reference voltage generation circuit is configured to provide the preset control voltage. The touch detection circuit is connected to the signal selection circuit and is configured to perform touch detection based on the touch control timing.
1 . A touch display control circuit for driving a liquid crystal screen, comprising:
a display driving circuit, wherein the display driving circuit comprises:
a signal transmission line configured to transmit a gate signal and a common signal;
a signal selection circuit configured to select a preset control voltage based on display control timing or touch control timing; and
a reference voltage generation circuit connected to the signal selection circuit and configured to provide the preset control voltage, and
a touch detection circuit connected to the signal selection circuit and configured to perform touch detection based on the touch control timing.
2 . The touch display control circuit according to claim 1 , wherein the signal selection circuit comprises:
a gate signal selection sub-circuit connected to the reference voltage generation circuit, and configured to select a target gate voltage based on the display control timing and transmit the target gate voltage to a gate line in the signal transmission line; and
a common electrode signal selection sub-circuit connected to the reference voltage generation circuit, and configured to select a target common voltage based on the display control timing or the touch control timing, and transmit the target common voltage to a common line in the signal transmission line.
3 . The touch display control circuit according to claim 2 , wherein the number of the touch detection circuit is equal to or greater than two, each common line is connected to one common electrode signal selection sub-circuit, and each common electrode signal selection sub-circuit is connected to any one of the touch detection circuits.
4 . The touch display control circuit according to claim 2 , wherein each common line is connected to one common electrode signal selection sub-circuit, and a plurality of common electrode signal selection sub-circuits are connected to a same touch detection circuit.
5 . The touch display control circuit according to claim 2 , wherein the signal selection circuit comprises a plurality of switches, and a control terminal of each of the plurality of switches is controlled based on the display control timing or touch control timing, to select the preset control voltage and transmit the selected preset control voltage to the signal transmission line.
6 . The touch display control circuit according to claim 5 , wherein the number of the touch detection circuit is equal to or greater than two, each common line is connected to one signal selection circuit, and each signal selection circuit is connected to any one of the touch detection circuits.
7 . The touch display control circuit according to claim 5 , wherein each common line is connected to one signal selection circuit, and a plurality of signal selection circuits are connected to a same touch detection circuit.
8 . The touch display control circuit according to claim 1 , wherein the touch detection circuit comprises:
an amplifier configured to detect a change value of self-capacitance of a common electrode and output a voltage signal corresponding to the change value of the self-capacitance; and
a plurality of switches.
9 . A control method applied to the touch display control circuit according to claim 1 , comprising:
controlling, based on the display control timing, the display driving circuit to be in an on-state and the touch detection circuit to be in an off-state, and selecting the preset control voltage, to allow the display driving circuit to output the preset control voltage to the signal transmission line, during a period of display timing; and
controlling, based on the touch control timing, the touch detection circuit to perform touch detection, during a period of touch timing.
10 . The method according to claim 9 , wherein the period of display touch timing comprises:
a first sub-period during which the display driving circuit is in the on-state and the touch detection circuit is in the off-state and a self-correction state; and
a second sub-period during which the touch detection circuit performs the touch detection.
11 . The method according to claim 9 , comprising:
performing the display control timing and the touch control timing based on a predetermined rule,
wherein the predetermined rule comprises that: m display control timing and n touch control timing are performed alternately, where m is an integer greater than or equal to zero, and n is an integer greater than or equal to one.
12 . An electronic device, comprising:
a body; and
a touch display control circuit for driving a liquid crystal screen, wherein the touch display control circuit comprises:
a display driving circuit, wherein the display driving circuit comprises:
a signal transmission line configured to transmit a gate signal and a common signal;
a signal selection circuit configured to select a preset control voltage based on display control timing or touch control timing; and
a reference voltage generation circuit connected to the signal selection circuit and configured to provide the preset control voltage, and
a touch detection circuit connected to the signal selection circuit and configured to perform touch detection based on the touch control timing.
13 . The electronic device according to claim 12 , wherein the signal selection circuit comprises:
a gate signal selection sub-circuit connected to the reference voltage generation circuit, and configured to select a target gate voltage based on the display control timing and transmit the target gate voltage to a gate line in the signal transmission line; and
a common electrode signal selection sub-circuit connected to the reference voltage generation circuit, and configured to select a target common voltage based on the display control timing or the touch control timing, and transmit the target common voltage to a common line in the signal transmission line.
14 . The electronic device according to claim 13 , wherein the number of the touch detection circuit is equal to or greater than two, each common line is connected to one common electrode signal selection sub-circuit, and each common electrode signal selection sub-circuit is connected to any one of the touch detection circuits.
15 . The electronic device according to claim 13 , wherein each common line is connected to one common electrode signal selection sub-circuit, and a plurality of common electrode signal selection sub-circuits are connected to a same touch detection circuit.
16 . The electronic device according to claim 13 , wherein the signal selection circuit comprises a plurality of switches, and a control terminal of each of the plurality of switches is controlled based on the display control timing or touch control timing, to select the preset control voltage and transmit the selected preset control voltage to the signal transmission line.
17 . The electronic device according to claim 16 , wherein the number of the touch detection circuit is equal to or greater than two, each common line is connected to one signal selection circuit, and each signal selection circuit is connected to any one of the touch detection circuits.
18 . The electronic device according to claim 16 , wherein each common line is connected to one signal selection circuit, and a plurality of signal selection circuits are connected to a same touch detection circuit.
19 . The electronic device according to claim 12 , wherein the touch detection circuit comprises:
an amplifier configured to detect a change value of self-capacitance of a common electrode and output a voltage signal corresponding to the change value of the self-capacitance; and
a plurality of switches.