CN103309501A - Method and system for controlling display driving chip by using touch sensing chip - Google Patents

Abstract

A method and system for controlling a display driving IC using a touch sensing chip. The method of the embodiment of the invention comprises the following steps: the display driving chip receives a sequence transmission signal with mode indication information from the touch sensing chip, and acquires the operation mode of the touch sensing chip according to the mode indication information. The method of another embodiment of the present invention includes setting a scan setting register of the display driver chip according to the setting information of the serial transmission signal when the touch sensor chip operates in the setting mode, and driving the scan lines according to the contents of the scan setting register after the first predetermined time elapses according to the scan command information of the serial transmission signal when the touch sensor chip operates in the command mode. By adopting the method and the system provided by the embodiment of the invention, the efficiency of touch sensing can be improved.

Description

Method and system for controlling display driver chip by using touch sensing chip

technical field

The present invention relates to a touch scanning control interface, in particular to a method for enabling a touch sensing chip to control a display driver chip through the control interface and a system using the method.

Background technique

When a touch system performs touch sensing, the tolerance to related noise interference will be a criterion for judging the performance of the touch system. For the interference that may occur in a specific frequency band, the current touch control system basically uses time-sharing/regional scanning or changing the scanning frequency to solve it.

When the touch system uses a shift register for touch sensing, because it can only be scanned sequentially, the scanning of a specific area still needs to be repeated to scan other areas, which will reduce the overall touch sensing proceeding efficiency.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention discloses a method for controlling a display driving IC by a touch sensing IC. The touch sensing chip is used to control and scan the touch panel and receive the sensing signals thereof, and the display driver chip is used to control the display panel and drive multiple scanning lines of the touch panel. The method of the present invention includes: the display driving chip receives the serial transmission signal from the touch sensing chip, wherein the serial transmission signal includes mode indication information, and the display driving chip obtains the operation mode of the touch sensing chip according to the mode indication information, and The serial transmission signal also includes setting message or scan command message corresponding to the operation mode of the touch sensing chip. The present invention also includes that when the touch sensing chip is operating in the setting mode, the display driving chip sets the scan setting register of the display driving chip according to the setting information of the serial transmission signal, and when the touch sensing chip is operating in the setting mode In the command mode, the display driver chip drives the scan line according to the content of the scan setting register after the first predetermined time is over according to the scan command information of the serial transmission signal.

The present invention further discloses a system for using the above-mentioned touch sensing chip to control a display driving chip. The system includes a touch panel controlled by a touch sensing chip to scan and receive sensing signals, and a display panel controlled by a display driver chip, wherein multiple scanning lines of the touch panel are driven by the display driver chip. The display driver chip is used to receive the serial transmission signal from the touch sensor chip, wherein the serial transmission signal includes mode instruction information, and the display driver chip obtains the operation mode of the touch sensor chip according to the mode instruction information, and the serial transmission signal also contains It includes setting information or scan command information corresponding to the operation mode of the touch sensing chip. When the touch sensing chip is operating in the setting mode, the scan setting register of the display driving chip is set according to the setting information of the serial transmission signal. When the touch sensing chip is operating in the command mode, the scan line is driven according to the content of the scan setting register after the first predetermined time according to the scan command information of the serial transmission signal.

The method and system provided by the embodiments of the present invention can solve the problem of reduced efficiency of the entire touch sensing process existing in the prior art.

The above descriptions about the contents of the present invention and the following descriptions of the embodiments are used to demonstrate and explain the spirit and principle of the present invention, and to provide further explanations of the claims of the present invention.

Description of drawings

FIG. 1 is a schematic block diagram of a display device according to an embodiment of the invention.

FIG. 2 is a schematic circuit diagram of a touch sensor chip controlling a display driver chip according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of serial transmission signals according to an embodiment of the invention.

FIG. 4 is a signal timing diagram according to an embodiment of the invention.

FIG. 5A is a schematic diagram of driving scan line signals according to an embodiment of the invention.

FIG. 5B is a schematic diagram of driving scan line signals according to an embodiment of the invention.

FIG. 6 is a flowchart of a method for controlling a DDIC by a TPIC according to an embodiment of the present invention.

[Description of main reference signs]

102 touch panel

104 display panel

106, 202 TPIC

108, 204DDIC

112, 206 clock pulse lines

114, 208 signal lines

116 synchronous signal line

306 start bit

308 stop bit

312, 314, 316, 318 bytes of data

322, 334DDIC address data

324, 336 TPIC operation mode data

326, 337 confirmation signal

328, 329 mode register address data

332 setting information

338 start scan line information

342 end scan line information

344 scan command

346 predetermined level time length

402, 406, 414 time points

404 sequence transmission signal transmission/reception time

408 First scheduled time

412 second scheduled time

502, 504 drive scan line signals

505, 507, 509, 511, 513, 517, 519, 521 drive pulse

506, 514 waiting time

508, 515 pre-determined zone dynamic pulse interval

512, 516 drive pulse time length

600TPIC control method flow of DDIC

602, 603 TPIC and DDIC start

604 waits for the synchronization signal VSYNC from DDIC

605 waits for the synchronization signal HSYNC of DDIC

606 decides whether to send any touch scanning control interface (touch scanning control interface, TSCI) request

Action flow of 608TSCI

612 Receive setting information/command information from TPIC

614 determines whether the TPIC is operating in command mode

616 Waiting for the first scheduled time

618 starts to drive the scan line

622DDIC sets its scan setting register according to the setting information in the serial transmission signal

624TPIC will wait for the end of the sustain clock pulse signal

626 TPIC will end the action of TSCI

628TPIC judges whether the end of each signal has been reached at this time

Detailed ways

The detailed features and advantages of the present invention are described in detail in the following embodiments, the content of which is sufficient for any person familiar with the ordinary knowledge in the art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the claims With the accompanying drawings, any person familiar with ordinary knowledge in the art can easily understand the related objects and advantages of the present invention. The following examples are to further describe the present invention in detail, but not to limit the scope of the present invention in any way.

Please refer to FIG. 1 , which is a simple block diagram of a display device 100 according to an embodiment of the present invention. The display sensing device 100 includes a touch panel (touch panel) 102, a display panel (display panel) 104, a touch sensing chip (touchpanel integrated circuit, TPIC) 106 for controlling the scanning of the touch panel 102, and a control display A display driving integrated circuit (DDIC) 108 of the panel 104 .

The TPIC 106 and the DDIC 108 are electrically connected via a clock line (clock) 112 and a signal line (data) 114 . The clock pulse line 112 and the signal line 114 are respectively connected to a common voltage source (VDD) through resistors R1 and R2. Through the clock line 112 and the signal line 114 , the TPIC 106 can control the DDIC 108 to output a scan signal (TX) to the touch panel 102 and receive a sensing signal (RX) from the touch panel 102 in response to the scan signal. Since the present invention provides a method for the TPIC 106 to control the DDIC 108, the TPIC 106 will be regarded as a master and the DDIC 108 will be regarded as a slave. In an embodiment of the present invention, the TPIC 106 can control the operation of the DDIC 108 by enabling the DDIC 108 to be configured as a slave terminal.

Between the TPIC 106 and the DDIC 108 , a synchronization signal is transmitted via a synchronization signal line 116 . The synchronization signal includes a horizontal synchronization signal (HSYNC) and a vertical synchronization signal (VSYNC).

Please refer to FIG. 2 . FIG. 2 is a schematic circuit diagram of realizing the touch sensor chip 202 controlling the display driver chip 204 according to an embodiment of the present invention. As mentioned above, the touch sensor chip (TPIC) 202 and the display driver chip (DDIC) 204 can be electrically connected to each other through the clock pulse line 206 and the signal line 208, and the clock pulse line 206 and the signal line 208 are respectively connected through pull-up resistors. R1 and R2 are connected to a common voltage source VDD. When the output clock pulse (CLK_OUT) or output signal (DATA_OUT) of TPIC202 or DDIC204 is at low level, the signal level of clock pulse line 206 or signal line 208 is also at low level. On the contrary, when the output clock pulse or output signal of TPIC202 or DDIC204 is at the corresponding high level, the signal of the clock pulse line 206 or the signal line 208 will be pulled up to the corresponding high level by the pull-up resistors R1 and R2 .

Through the clock pulse line 206 and the signal line 208, the TPIC202 can transmit the serial transmission signal to the DDIC204. The serial transmission signal transmitted on the clock line 206 and the signal line 208 may be mode specifying information, and the mode specifying information allows the TPIC 202 to inform the DDIC 204 about the operation mode of the TPIC 202 . This operation mode includes setting mode and command mode.

When the TPIC202 operates in the setting mode, the TPIC202 can transmit the setting message to the DDIC204 via the clock line 206 and the signal line 208 . When the TPIC202 operates in the command mode, the clock pulse line 206 and the signal line 208 transmit scan command information (command message) from the TPIC202 to the DDIC204.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of serial transmission signals 300 - 304 according to an embodiment of the present invention. The serial transmission signals 300-304 all include signals transmitted through clock pulse lines and signal lines. The serial transmission signal 300 indicates the basic format of the serial transmission signals 302-304. For example, the serial transmission signal 300 includes a start bit (start bit) 306 and a stop bit (stop bit) 308 . A plurality of bytes of data 312-318 are contained between the start bit 306 and the stop bit 308. These multiple byte data 312-318 include DDIC address data, TPIC operation mode data, mode setting register address (register address) data, setting information (setting message), start/end scan line information (start scan line/ end scan line) and scan command information (command message).

The serial transmission signal 302 is an embodiment of the signal transmitted on the clock pulse line and the signal line when the TPIC operates in the setting mode. As mentioned above, the serial transmission signal 302 includes DDIC address data (device ID) 322 (corresponding to the byte data 312 of the serial transmission signal 300), and the TPIC operation mode data (mode) 324 follows the DDIC address data. This mode data can be a bit (bit) in length. The mode data 324 may be set to 1 when the TPIC operates in the setting mode, and set to 0 when the TPIC operates in the command mode. And when the DDIC corresponding to the DDIC address data 322 receives the TPIC operation mode data 324 , the DDIC will respond an acknowledgment signal (acknowledgment, ACK) 326 with a bit length to the TPIC. In one embodiment, the DDIC returns an acknowledgment signal 326 every time a byte of data is received. However, if the TPIC does not receive an acknowledgment 326 from the DDIC after a byte of data is received, the TPIC can retransmit the byte of data and issue an alert message.

The serial transmission signal 302 additionally includes mode register address data 328 and 329 (corresponding to the byte data 314 and 316 of the serial transmission signal 300 ), that is to say, the length of the mode register address data may reach two bytes. Also after receiving each byte of mode register address data, a bit-length acknowledgment signal 326 is sent back from the DDIC to the TPIC.

The configuration information 332 additionally included in the serial transmission signal 302 has a length of at least one byte (corresponding to the byte data 318 of the serial signal 300 ). The setting information 332 is used to set the content of the mode register corresponding to the address data of the mode register. Likewise, when a one-byte configuration message 332 is received, a one-bit acknowledgment signal 326 is sent to the TPIC.

When the TPIC operates in the command mode, the serial transmission signal 304 transmitted to the DDIC also includes DDIC address data 334, TPIC operation mode data 336 with a length of one bit and set to 0, start scan line information 338, end Scan line information 342 and scan command 344 . Same as when the TPIC operates in the setup mode, after the DDIC receives the TPIC operation mode data 336 following the DDIC address data 334 , another acknowledgment signal 337 is sent from the DDIC to the TPIC. The acknowledgment signal 337 is also sent from the DDIC to the TPIC after the DDIC receives the start scan line information 338 , the end scan line information 342 and the scan command 344 .

When the DDIC finishes receiving the scan command 344 , it waits for a first predetermined period of time, and then starts to drive the scan line according to the content of the mode register and the instruction of the scan command 344 . However, the clock pulse signal transmitted on the clock pulse line remains at a predetermined level during the first predetermined time and before the end of driving the scanning line. More precisely, the clock pulse signal will be maintained (stretch) at a predetermined level for a second predetermined time after the scanning operation starts, so that the time length 346 of the clock pulse signal at the predetermined level is equal to the first predetermined time and the sum of the second scheduled time. The unit of the first predetermined time is the synchronization signal HSYNC, that is to say, the time length of the first predetermined time may be the time length of a plurality of synchronization signals HSYNC.

When the clock signal is no longer maintained at the predetermined level, the stop bit 308 of the serial transmission signal 300 is output. Afterwards, the DDIC may wait for the reception of the next sequence of transmission signals.

Please refer to FIG. 4 , which is a signal timing diagram according to an embodiment of the present invention. TPIC can issue a request to control DDIC (touch scan control interface request, TSCI request). The TSCI request may be a request to control the DDIC (first TSCI request). The first TSCI request is to control the DDIC to drive the scanning line when the synchronization signal (HSYNC) is at a falling edge (time point 402 ). Afterwards, the TPIC will send the serial transmission signal 204 as shown in Figure 3, including the DDIC address, start/end scan line and scan command information to the DDIC. The transmission and reception of the serial transmission signal 204 requires a length of 404 in one embodiment. , that is, the clock pulse signal (CLK) transmitted on the clock pulse line at the time point 406 will be pulled down to a predetermined level. And after the first predetermined time length 408 counted from the time point 406 , the scanning line starts to be driven when the synchronization signal HSYN is at another falling edge again.

Driving the scanning lines may continue until the second predetermined time 412 , and the clock pulse signal is still maintained at a predetermined level during the second predetermined time 412 until the operation of driving the scanning lines is completed.

In one embodiment, the first predetermined length of time 408 may be greater than the second predetermined length of time 412 .

The TPIC can also send a request for setting the content of the DDIC scan setting register (such as the second TSCI request). The second TSCI request is also when the synchronization signal HSYNC is on a falling edge (time point 414 ), so that the TPIC transmits the serial transmission signal 304 as shown in FIG. 3 to the DDIC. The information contained in the serial transmission signal 304, such as the setting information used to set the scan setting registers, will be stored in the scanning registers, and the driving of the scanning lines is based on the contents of these scanning setting registers (setting information ) for it.

The scan setting register of DDIC includes setting register and command register. For the contents of the setting register and the command register, reference may be made to the description of FIG. 5A and FIG. 5B . 5A and 5B are schematic diagrams of driving scan line signals (TX) 502 and 504 respectively. The scan line driving signal includes a plurality of driving pulses 505 - 511 and 513 , 517 , 519 and 521 . FIG. 5A and FIG. 5B are assuming that a certain touch panel has 4 scanning lines in total. FIG. 5A and FIG. 5B can also be used to illustrate the situation that another touch panel has more than 4 scan lines, and only 4 of the scan lines are selected to drive the scan lines in a specific range. The scanning lines in a specific range can be defined by the aforementioned start scanning line and ending scanning line information.

The driving of the scan line may start after waiting for a predetermined time (wait time (offset)) 506 from the trigger of the falling edge of the synchronization signal HSYNC. This predetermined time 506 may be part of the content of the setup register. There may be a predetermined interval (hold time) 508 between the driving pulses driving each scanning line, and the time length (TX width) 512 of each driving pulse is also part of the content of the setting register. In addition, the scanning line driving signal 502 drives each of the four scanning lines twice, and the number of times of driving an individual scanning line is part of the content of the command register.

Similarly, the scanning line driving signal 504 also drives the 4 scanning lines twice, and the driving of the scanning lines twice is a part of the content of the command register as mentioned above. The scan line driving signal 504 also indicates that the operation of driving the four scan lines starts after waiting for a predetermined waiting time 514 after being triggered by the falling edge of the synchronization signal HSYNC. The predetermined waiting time 514, the possible predetermined interval 515 between adjacent driving pulses, and the duration 516 of each driving pulse can be part of the content of the setting register. FIG. 5A is to drive all four scan lines to be scanned sequentially once, while FIG. 5B is to drive each scan line to be scanned twice in sequence. In other words, the scan lines in FIG. 5A and FIG. 5B actually belong to different driving modes (TX mode), and the driving mode information is also a part of the content of the command register.

FIG. 6 is a flowchart of a method 600 for controlling a DDIC by a TPIC according to an embodiment of the present invention. Both TPIC and DDIC first start each other's initial actions (steps 602 and 603). TPIC then waits for the synchronization signal VSYNC from the DDIC (step 604 ), and TPIC also waits for the synchronization signal HSYNC from the DDIC (step 605 ), and decides whether to send any TSCI request (step 606 ). After sending the TSCI request, the TPIC can start the TSCI action process (step 608). The operation flow is firstly that the DDIC receives the setting information/command information from the TPIC (step 612). The setting information/command information is transmitted from the TPIC to the DDIC via serial transmission signals.

The DDIC judges the operation mode of the TPIC through the received serial transmission signal to determine whether the TPIC is operating in the command mode (step 614 ). When the TPIC is operating in the command mode, the DDIC waits for a first predetermined time before starting to drive the scan lines (steps 616-618). When the serial transmission signal received by the DDIC indicates that the TPIC is not operating in the command mode but in the setting mode, the DDIC will set its scan setting register according to the setting information in the serial transmission signal (step 622 ). When the aforementioned DDIC drives the scan lines in step 618 , the DDIC will be performed according to the content of the scan setting register (the content is usually written into the scan setting register in step 622 ).

During the operation of the DDIC driving the scanning lines, the clock signal CLK between the DDIC and the TPIC (such as the clock signal transmitted on the clock line 206 in FIG. 2 ) is maintained at a predetermined signal level. In other words, the TPIC waits for the end of the sustain clock signal (step 624). Afterwards, the TPIC will end the action of the TSCI (step 626).

The TPIC also determines whether the end of each frame signal has been reached (step 628 ), if yes, the process 600 proceeds to step 604 to wait for the synchronization signal VSYNC. Otherwise, the process 600 goes to step 605 to wait for the synchronization signal HSYNC.

Although the present invention is disclosed above with the foregoing embodiments, they are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications made belong to the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the scope of the appended claims.

Claims (21)

1. method by a touch-control sensing chip controls one display driver chip, wherein this touch-control sensing chip is a contact panel that scans and receive the one sensing signal in order to control, and this display driver chip is a plurality of sweep traces of controlling a display panel and driving this contact panel, and the method comprises:

This display driver chip receives a sequence transmission signal that comes from this touch-control sensing chip, wherein this sequence transmission signal includes a pattern indication information, this display driver chip is known an operating mode of this touch-control sensing chip according to this pattern indication information, and this sequence transmission signal also includes a set information or one scan command information corresponding to this operating mode of this touch-control sensing chip;

When this touch-control sensing chip is when operating on a set model, this display driver chip drives the one scan set-up register of chip according to this set information set and display of this sequence transmission signal; And

When this touch-control sensing chip is running during in a command mode, after this display driver chip finishes in one first schedule time according to this scan command information of this sequence transmission signal according to the described a plurality of sweep traces of a content driven of this scanning set-up register.

2. the method for claim 1, also be contained in this scanning motion and begin to carry out rear lasting maintenance one time clock signal in one second schedule time an of predetermined level, receive another this sequence transmission signal after finishing at the described a plurality of sweep traces of driving, wherein this clock pulse signal is another sequence transmission signal.

3. method as claimed in claim 2, wherein this touch-control sensing chip is configured to wait for that this display driver chip continues to keep this clock pulse signal after this predetermined level reaches this second schedule time, prepares to transmit another this sequence transmission signal.

4. method as claimed in claim 2, wherein this first schedule time is as unit take a horizontal-drive signal.

5. the method for claim 1 also is contained in when receiving this sequence transmission signal and transmits a confirmation to this touch-control sensing chip.

6. the method for claim 1, this sequence transmission signal of this predetermined length includes an address of this display driver chip, an address of this pattern set-up register, this set information, or initial/as to finish sweep trace information.

7. the method for claim 1 also is contained in to finish and drives described a plurality of sweep traces or finish and wait for another this sequence transmission signal of reception after setting this scanning set-up register.

8. the method for claim 1, wherein the time length of this first schedule time is greater than a time length of this scan command information.

9. the method for claim 1, wherein this content of this scanning set-up register comprises one scan line scope corresponding when driving described a plurality of sweep trace.

10. the method for claim 1, wherein this touch-control sensing chip is configured to receive the synchronous signal that this display driver chip is exported, and determines whether to have in this synchronizing signal a touch-control scan control interface demand.

11. the method for claim 1, wherein this touch-control sensing chip is configured to determine this touch-control sensing chip that will control and sets the one group of parameter that drives described a plurality of sweep traces when operating in this set model, wherein this group parameter comprises the stand-by period of a driving pulse, one driving pulse time span, and the interval of two adjacent driving pulses.

12. a use is comprised by the system of the method for a touch-control sensing chip controls one display driver chip:

One is scanned and is received the contact panel of one sensing signal by this touch-control sensing chip controls; And

One display panel by this display driver chip control, wherein a plurality of sweep traces of this contact panel are driven by this display driver chip;

Wherein, this display driver chip is a sequence transmission signal that comes from this touch-control sensing chip in order to reception, wherein this sequence transmission signal comprises a pattern indication information, this display driver chip is known an operating mode of this touch-control sensing chip according to this pattern indication information, and this sequence transmission signal also comprises a set information or one scan command information corresponding to this operating mode of this touch-control sensing chip;

When this touch-control sensing chip is when operating on a set model, set the one scan set-up register of this display driver chip according to this set information of this sequence transmission signal; And

When this touch-control sensing chip is when operating in a command mode, finish to scan according to this afterwards the described a plurality of sweep traces of a content driven of set-up register in one first schedule time according to this scan command information of this sequence transmission signal.

13. system as claimed in claim 12, wherein this touch-control sensing chip is configured to receive the synchronous signal that this display driver chip is exported, and determines whether to have in this synchronizing signal a touch-control scan control interface demand.

14. system as claimed in claim 12, wherein this touch-control sensing chip is configured to determine this touch-control sensing chip that will control and one group of parameter setting this scanning motion when operating in this set model, wherein this group parameter comprises the stand-by period of a driving pulse, one driving pulse time span, and the interval of two adjacent driving pulses.

15. system as claimed in claim 12, wherein this touch-control sensing chip is one scan line scope corresponding when driving described a plurality of sweep trace in order to decision when operating in this command mode, and this content of this scanning set-up register comprises this scanning line range.

16. system as claimed in claim 12, wherein this display driver chip also is contained in this scanning motion and carries out rear lasting maintenance one time clock signal in one second schedule time an of predetermined level, receive another this sequence transmission signal after finishing at the described a plurality of sweep traces of driving, wherein this clock pulse signal is another sequence transmission signal.

17. system as claimed in claim 12, wherein this touch-control sensing chip is configured to wait for that this display driver chip continues to keep this clock pulse signal after this predetermined level reaches this second schedule time, prepares to transmit another this sequence transmission signal.

18. system as claimed in claim 12 transmits a confirmation to this sensing control chip when wherein this display driver chip also is contained in this sequence transmission signal that receives a predetermined length.

19. system as claimed in claim 12, wherein this sequence transmission signal of this predetermined length includes an address of this display driver chip, an address of this pattern set-up register, this set information, or initial/end sweep trace information.

20. system as claimed in claim 12 waits for after wherein this display driver chip also is contained in and finishes the described a plurality of sweep traces of driving or finish this scanning set-up register of setting receiving another this sequence transmission signal.

21. system as claimed in claim 12, wherein the time length of this first schedule time is greater than a time length of this command information.

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