TOUCH SCREEN DISPLAY APPARATUS

• US 20140104205A1
• Filed: 08/21/2013
• Published: 04/17/2014
• Est. Priority Date: 10/11/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: HUANG, Zhongshou
• Granted Patent: US 9,218,088 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/044 by capacitive means
• 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

The present invention provides a touch screen display apparatus including a touch structure. The touch structure includes multiple driving lines arranged in a column direction, multiple sensing lines arranged in a row direction, a preamplifier, a frequency outputter, a first shift register, and a second shift register. The first shift register is arranged between the driving lines and the frequency outputter, and the second shift register is arranged at output ends of the sensing lines. Each driving line outputs a driving signal and each sensing line outputs a sensing signal for the preamplifier. Accordingly, a single preamplifier may be used.

Claims

1. A touch screen display apparatus, comprising a touch structure, wherein the touch structure comprises:

multiple driving lines arranged in a column direction,

multiple sensing lines arranged in a row direction,

a preamplifier,

a frequency outputter,

a first shift register, and

a second shift register, wherein the frequency outputter is configured to output a driving signal at a predetermined frequency, wherein the first shift register is configured to output the driving signal to each driving line, wherein the second shift register is configured to output a sensing signal from each sensing line to the preamplifier, and wherein the preamplifier is configured to output an amplified sensing signal based on the sensing signal from the second shift register.

2. The touch screen display apparatus according to claim 1, further comprising a TFT substrate on which the first shift register and the second shift register are fabricated.

3. The touch screen display apparatus according to claim 2, further comprising a CF substrate, wherein the driving lines are fabricated on the CF substrate or the TFT substrate, and the sensing lines are fabricated on the CF substrate or the TFT substrate.

4. The touch screen display apparatus according to claim 3, wherein the driving lines are fabricated on the CF substrate, and an output end of the first shift register is connected to a corresponding driving line through a conductive gold spacer, or the driving lines are fabricated on the TFT substrate, and the output end of the first shift register is connected to the corresponding driving line through a via hole on the TFT substrate.

5. The touch screen display apparatus according to claim 3, wherein the sensing lines are fabricated on the CF substrate, and an output end of the second shift register is connected to a corresponding sensing line through a conductive gold spacer, or the sensing lines are fabricated on the TFT substrate, and the output end of the second shift register is connected to the corresponding sensing line through a via hole on the TFT substrate.

6. The touch screen display apparatus according to claim 3, wherein the number of selection switches is the same as the number of sensing lines, and wherein an output end of each sensing line is connected in series to one selection switch;

and

the output end of each sensing line is electrically connected to a first end of one of the selection switches, a second end of the selection switch is electrically connected to an inverting input of the preamplifier, and an output end of the second shift register is electrically connected to a control end of each selection switch.

7. The touch screen display apparatus according to claim 6, wherein the selection switches are arranged on the TFT substrate, and

the sensing lines are fabricated on the CF substrate, and the output end of each sensing line is electrically connected to the first end of the selection switch through a conductive gold spacer, or

the sensing lines are fabricated on the TFT substrate, and the output end of each sensing line is electrically connected to the first end of the selection switch through a via hole on the TFT substrate.

8. The touch screen display apparatus according to claim 2, wherein a plurality of scanning lines are arranged on the TFT substrate to be electrically connected to one of the first shift register and the second shift register.

9. The touch screen display apparatus according to claim 8, wherein one of every N output lines in the first shift register is connected to a corresponding driving line, or one of every Z output lines in the second shift register is connected to a corresponding sensing line, and wherein N is an integer of 2 or above, and Z is an integer of 2 or above.

10. The touch screen display apparatus according to claim 9, wherein N is the ratio of the number of scanning lines to the number of driving lines, and Z is the ratio of the number of scanning lines to the number of sensing lines.

11. The touch screen display apparatus according to claim 1, wherein M first selection switches are connected in parallel between each driving line and an input driving signal bus bar, and wherein the first selection switches each have a first end connected to the driving line, a second end connected to the input driving signal bus bar, and a control end connected to output ends of the first shift register, wherein M is an integer of 2 or above.

12. The touch screen display apparatus according to claim 1, wherein P second selection switches are connected in parallel between each sensing line and an output data bus bar, and wherein the second selection switches each have a first end connected to the sensing line and a second end connected to the output data bus bar, and a control end connected to output ends of the second shift register, wherein P is an integer of 2 or above.

13. The touch screen display apparatus according to claim 1, wherein the first shift register and the second shift register comprise amorphous silicon or low temperature poly-silicon or indium gallium zinc oxide.

14. The touch screen display apparatus according to claim 1, wherein the preamplifier further comprises a feedback network, wherein the feedback network comprises at least two feedback branches connected in parallel, wherein one of the feedback branches comprises a resistor, and the other feedback branch comprises a resistor and a switch connected in series, and wherein the feedback network has its resistance changed by controlling the switch.

15. The touch screen display apparatus according to claim 14, wherein the preamplifier further comprises a compensation network, and wherein the compensation network comprises a compensation resistor through which an inverting input of the preamplifier is connected to a compensation signal source.

16. A touch screen display apparatus, comprising:

a plurality of driving lines arranged in a column direction;

a plurality of sensing lines arranged in a row direction;

a preamplifier;

a frequency outputter;

a first shift register;

a plurality of first selection switches;

a second shift register; and

a plurality of second selection switches,

wherein the frequency outputter is configured to output a driving signal at a predetermined frequency, wherein the first selection switches are configured to output the driving signal to each driving line according to an output of the first shift register, wherein the second selection switches are configured to output a sensing signal from each sensing line to the preamplifier according to an output of the second shift register, and wherein the preamplifier is configured to output an amplified sensing signal based on the sensing signal from the second selection switches.

17. The touch screen display apparatus according to claim 16, further comprising a TFT substrate on which the first shift register and the second shift register are fabricated.

18. The touch screen display apparatus according to claim 16, wherein M first selection switches are connected in parallel between each driving line and an input driving signal bus bar, and wherein the first selection switches each have a first end connected to the driving line, a second end connected to the input driving signal bus bar, and a control end connected to output ends of the first shift register, wherein M is an integer of 2 or above.

19. The touch screen display apparatus according to claim 16, wherein P second selection switches are connected in parallel between each sensing line and an output data bus bar, and wherein the second selection switches each have a first end connected to the sensing line and a second end connected to the output data bus bar, and a control end connected to output ends of the second shift register, wherein P is an integer of 2 or above.

20. The touch screen display apparatus according to claim 16, wherein the preamplifier further comprises a feedback network, wherein the feedback network comprises at least two feedback branches connected in parallel, wherein one of the feedback branches comprises a resistor, and the other feedback branch comprises a resistor and a switch connected in series, and wherein the feedback network has its resistance changed by controlling the switch.