TOUCH DISPLAY DEVICE

• US 20110109568A1
• Filed: 04/13/2010
• Published: 05/12/2011
• Est. Priority Date: 11/09/2009
• Status: Active Grant

• Current Assignee: Silicon Integrated Systems Corporation (Silicon Integrated Systems Corporation Taiwan)
• Original Assignee: Silicon Integrated Systems Corporation (Silicon Integrated Systems Corporation Taiwan)
• Inventors: WU, Hung-Wei, Chen, Tsan-Hwi, Lee, Ming-Hsien
• Granted Patent: US 8,659,559 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touch display apparatus is disclosed. Without additional touch device, either the reversed AM structure or a conventional PM structure is provided to combine with the human body'"'"'s conductive properties and the noise-immune sensing circuit design, thereby to achieve the purpose of displaying images and performing multi-touch detection simultaneously. Thus, the hardware cost and the power consumption are reduced.

Claims

1. An active-matrix touch display device, comprising:

an array substrate having a top surface, a bottom surface opposite the top surface and a signal layer, the signal layer disposed on the bottom surface, the signal layer including plural scan lines and plural data lines, wherein pixels are respectively formed at intersections of the plural scan lines and the plural data lines, and each pixel includes a switching element and a pixel electrode;

an opposite substrate disposed to be opposite the array substrate and having a common electrode opposite the pixel electrodes, wherein the opposite substrate is positioned farther from a user than the array substrate is;

a display material layer sandwiched between the array substrate and the opposite substrate;

a gate driver for sequentially supplying a gate pulse to the plural scan lines, wherein output terminals of the gate driver and the scan lines are connected at plural first connection nodes;

a source driver for supplying plural image data to the plural data lines, wherein output terminals of the source driver and the data lines are connected at plural second connection nodes;

at least one sensing circuit for performing touch detection on at least one of the plural scan lines and the plural data lines, each of the at least one sensing circuit comprising;

a driving unit for supplying a driving signal to at least one of the plural first connection nodes and the plural second connection nodes according to a specified frequency; and

a detecting unit for performing signal extraction on at least one of output signals of the plural first connection nodes and the plural second connection nodes to generate a measuring value; and

a controller for controlling the gate driver, the source driver and the at least one sensing circuit.

2. The touch display device according to claim 1, wherein the driving unit comprises:

a wave generator for generating a digital signal according to the specified frequency within a fixed measurement time interval; and

a voltage driver for generate the driving signal according to the digital signal.

3. The touch display device according to claim 1, wherein, during a frame period, when the gate pulse is supplied to one of the plural scan lines, the at least one sensing circuit simultaneously performs the touch detection on at least one of the other plural scan lines.

4. The touch display device according to claim 1, wherein, during a vertical blanking period, the at least one sensing circuit simultaneously performs touch detection on at least one of the plural scan lines and the plural data lines.

5. The touch display device according to claim 1, wherein the detecting unit comprises:

a bandpass-filter for performing filtering on the at least one of the output signals according to the specified frequency and generating a filtered signal; and

a root mean square unit for calculating a root mean square value of the filtered signal and generating the measuring value;

wherein the specified frequency is fixed.

6. The touch display device according to claim 1, wherein the detecting unit comprises:

a root mean square unit for calculating a root mean square value of the at least one of the output signals and generating the measuring value;

wherein the specified frequency is fixed.

7. The touch display device according to claim 1, wherein the detecting unit comprises:

a signal extracting unit for performing signal demodulation on the at least one of the output signals according to the driving signal and generating the measuring value;

wherein the specified frequency is either a fixed frequency or a combination of random frequency components.

8. The touch display device according to claim 1, wherein the driving signal comprises two complementary signals.

9. The touch display device according to claim 8, wherein the detecting unit comprises:

a differential amplifier for receiving two of the output signals of two corresponding connection nodes that receive the two complementary signals and eliminating low-frequency noise to generate a sensing signal;

a bandpass filter for performing filtering on the sensing signal according to the specified frequency and generating a filtered signal; and

a root mean square unit for calculating a root mean square value of the filtered signal and generating the measuring value;

wherein the specified frequency is fixed.

10. The touch display device according to claim 8, wherein the detecting unit comprises:

a differential amplifier for receiving two of the output signals of two corresponding connection nodes that receive the two complementary signals and eliminating low-frequency noise to generate a sensing signal;

a root mean square unit for calculating a root mean square value of the sensing signal and generating the measuring value;

wherein the specified frequency is fixed.

11. The touch display device according to claim 8, wherein the detecting unit comprises:

a differential amplifier for receiving two of the output signals of two corresponding connection nodes that receive the two complementary signals and eliminating low-frequency noise to generate a sensing signal; and

a signal extracting unit for performing signal demodulation on the sensing signal according to the driving signal and generating the measuring value;

wherein the specified frequency is either a fixed frequency or a combination of random frequency components.

12. The touch display device according to claim 1, wherein the display material layer comprises a plurality of microcapsules.

13. The touch display device according to claim 1, wherein the display material layer comprises a plurality of electroluminescence (EL) elements.

14. The touch display device according to claim 1, wherein the display material layer comprises a liquid crystal (LC) material.

15. The touch display device according to claim 1, wherein a voltage level of a first driving signal supplied to at least one of the plural first connection nodes is less than a voltage level of a second driving signal supplied to at least one of the plural second connection nodes.

16. The touch display device according to claim 1, wherein the at least one sensing circuit respectively performs touch detection on at least one sensing channel, and wherein each of the at least one sensing channel comprises plural adjacent scan lines or plural adjacent data lines.

17. A passive-matrix touch display device, comprising:

a first substrate having a top surface, a bottom surface opposite the top surface and a first signal layer, the first signal layer disposed on the bottom surface, the first signal layer including plural first signal lines;

a second substrate disposed to be opposite the first substrate and having a second signal layer opposite the first signal layer, wherein the second substrate is positioned farther from an user than the first substrate is;

a display material layer sandwiched between the first substrate and the second substrate;

a first signal driver for supplying at least one first voltage signal to the plural first signal lines, wherein output terminals of the first signal driver and the first signal lines are connected at plural first connection nodes;

a second signal driver for supplying at least one second voltage signal to the plural second signal lines, wherein output terminals of the second signal driver and the second signal lines are connected at plural second connection nodes;

at least one sensing circuit for performing touch detection on at least one of the plural first signal lines and the plural second signal lines, each of the at least one sensing circuit comprising;

a driving unit for supplying a driving signal to at least one of the plural first connection nodes and the plural second connection nodes according to a specified frequency; and

a detecting unit for performing signal extraction on at least one of output signals of the plural first connection nodes and the plural second connection nodes to generate a measuring value; and

a controller for controlling the first driver, the second signal driver and the at least one sensing circuit.

18. The touch display device according to claim 17, wherein the driving unit comprises:

a wave generator for generating a digital signal according to the specified frequency within a fixed measurement time interval; and

a voltage driver for generate the driving signal according to the digital signal.

19. The touch display device according to claim 17, wherein, when the first signal layer comprise plural scan lines, the second signal layer comprises plural data lines;

and wherein, when the second signal layer comprise plural scan lines, the first signal layer comprises plural data lines.

20. The touch display device according to claim 19, wherein, during a frame period, when a gate pulse is supplied to one of the plural scan lines, the at least one sensing circuit simultaneously performs touch detection on at least one of the other plural scan lines.

21. The touch display device according to claim 17, wherein, during a vertical blanking period, the at least one sensing circuit simultaneously performs touch detection on at least one of the plural first signal lines and the plural second signal lines.

22. The display device according to claim 17, wherein the detecting unit comprises:

a bandpass-filter for performing filtering operations on the at least one of the output signals according to the specified frequency and generating a filtered signal; and

a root mean square unit for calculating a root mean square value of the filtered signal and generating the measuring value;

wherein the specified frequency is fixed.

23. The touch display device according to claim 17, wherein the detecting unit comprises:

a root mean square unit for calculating a root mean square value of the at least one of the output signals and generating the measuring value;

wherein the specified frequency is fixed.

24. The touch display device according to claim 21, wherein the detecting unit comprises:

a signal extracting unit for performing signal demodulation on the at least one of the output signals according to the driving signal and generating the measuring value;

wherein the specified frequency is either a fixed frequency or a combination of random frequency components.

25. The touch display device according to claim 17, wherein the driving signal comprises two complementary signals.

26. The touch display device according to claim 25, wherein the detecting unit comprises:

a differential amplifier for receiving two of the output signals of two corresponding connection nodes that receive the two complementary signals and eliminating low-frequency noise to generate a sensing signal;

a bandpass filter for performing filtering operations on the sensing signal according to the specified frequency and generating a filtered signal; and

a root mean square unit for calculating a root mean square value of the filtered signal and generating the measuring value;

wherein the specified frequency is fixed.

27. The touch display device according to claim 25, wherein the detecting unit comprises:

a differential amplifier for receiving two of the output signals of two corresponding connection nodes that receive the two complementary signals and eliminating low-frequency noise to generate a sensing signal;

a root mean square unit for calculating a root mean square value of the sensing signal and generating the measuring value;

wherein the specified frequency is fixed.

28. The touch display device according to claim 25, wherein the detecting unit comprises:

a differential amplifier for receiving two of the output signals of two corresponding connection nodes that receive the two complementary signals and eliminating low-frequency noise to generate a sensing signal; and

a signal extracting unit for performing signal demodulation on the sensing signal according to the driving signal and generating the measuring value;

wherein the specified frequency is either a fixed frequency or a combination of random frequency components.

29. The touch display device according to claim 17, wherein the display material layer comprises a plurality of microcapsules.

30. The touch display device according to claim 17, wherein the display material layer comprises a plurality of electroluminescence (EL) elements.

31. The touch display device according to claim 17, wherein the display material layer comprises a liquid crystal (LC) material.

32. The touch display device according to claim 17, wherein the at least one sensing circuit respectively performs touch detection on sensing channels, and wherein each of the sensing channels comprises plural adjacent first signal scan lines or plural adjacent second signal lines.