In-cell touch panel sensing system and sensing method for the in-cell touch panel sensing system
The present invention provides an in-cell touch panel sensing system and a sensing method. The in-cell touch panel sensing system comprises sensing arrays. Each sensing array comprises: sensor plates; a first multiplexer (MUX), a first analog-to-digital converter (ADC), a second MUX, a second ADC, a third MUX, a third ADC, a fourth MUX, and a fourth ADC. The first MUX is coupled to a first row of the sensor plates and a first column of the sensor plates. The first ADC is coupled to the first MUX. The second MUX is coupled to a second row of the sensor plates and a second column of the sensor plates. The third MUX is coupled to a third row of the sensor plates and a third column of the sensor plates. The fourth MUX is coupled to a fourth row of the sensor plates and a fourth column of the sensor plates.
1. An in-cell touch panel sensing system, comprising:
a plurality of sensing arrays, each sensing array comprising:
a plurality of sensor plates;
a first multiplexer (MUX), coupled to each of the sensor plates in a first row and to each of the sensor plates in a first column;
a first analog-to-digital converter (ADC), coupled to the first MUX;
a second MUX, coupled to each of the sensor plates in a second row and to each of the sensor plates in a second column;
a second ADC, coupled to the second MUX;
a third MUX, coupled to each of the sensor plates in a third row and to each of the sensor plates in a third column;
a third ADC, coupled to the third MUX;
a fourth MUX, coupled to each of the sensor plates in a fourth row and to each of the sensor plates in a fourth column; and
a fourth ADC, coupled to the fourth MUX.
2. The in-cell touch panel sensing system of claim 1 , wherein each row of the sensor plates comprises four sensor plates, and each column of the sensor plates comprises four sensor plates.
3. The in-cell touch panel sensing system of claim 1 , wherein the first ADC, the second ADC, the third ADC, and the fourth ADC scan the first column of the sensor plates, the second column of the sensor plates, the third column of the sensor plates, and the fourth column of the sensor plates simultaneously in a first time slot.
4. The in-cell touch panel sensing system of claim 1 , wherein the first ADC, the second ADC, the third ADC, and the fourth ADC scan the first row of the sensor plates, the second row of the sensor plates, the third row of the sensor plates, and the fourth row of the sensor plates simultaneously in a second time slot.
5. The in-cell touch panel sensing system of claim 1 , wherein the first ADC, the second ADC, the third ADC, and the fourth ADC use two time slots to complete a position sensing operation once.
6. The in-cell touch panel sensing system of claim 1 , applied to a Touch and Display Driver Integration (TDDI) chip.
7. The in-cell touch panel sensing system of claim 6 , wherein the TDDI chip is utilized for sensing a 240 Hz active pen and 120 Hz touch sensing.
8. A sensing method for the in-cell touch panel sensing system of claim 1 , comprising:
utilizing the first ADC, the second ADC, the third ADC, and the fourth ADC to scan the first column of the sensor plates, the second column of the sensor plates, the third column of the sensor plates, and the fourth column of the sensor plates simultaneously in a first time slot; and
utilizing the first ADC, the second ADC, the third ADC, and the fourth ADC scan the first row of the sensor plates, the second row of the sensor plates, the third row of the sensor plates, and the fourth row of the sensor plates simultaneously in a second time slot to complete a position sensing operation once.
9. The sensing method of claim 8 , applied to a Touch and Display Driver Integration (TDDI) chip.
10. The sensing method of claim 9 , wherein the TDDI chip is utilized for sensing a 240 Hz active pen and 120 Hz touch sensing.