Patent Publication Number: US-2017371460-A1

Title: Touch signal scanning method

Description:
FIELD OF THE INVENTION 
     The present invention relates to a technical field of displays, and more particularly to a touch display panel and a touch display device. 
     BACKGROUND OF THE INVENTION 
     Along with the popularity of intelligent electronic products, capacitive touch display devices are now widely used in various electronic products, for example, intelligent mobile phones or tablets. Existing capacitive touch display devices includes G-G (glass-glass, transducer glass-tempered glass), GF (glass-film), OFF (glass-film-film) and OGS (one glass solution) plug-in architectures etc., and On-cell (touch transducers disposed on a display panel) and In-cell (touch transducers embedded on a display panel) embedded architecture, etc. 
     However, by improving the resolution of electronic products, the time for display scanning must be longer, and the time for corresponding touch scanning will be decreased, so as to affect a touch result of a touch display device. 
     Therefore, it is necessary to provide a touch display panel and a touch display device to solve the above described problems. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a touch signal scanning method which has a shorter touch scanning time and does not affect the touch result of a touch display device, so as to solve a technical problem of an existing touch signal scanning method which has too short a touch scanning time, so as to affect the touch result of the touch display result. 
     To solve the problems described above, the technical solution of the present invention is as follows. 
     A touch signal scanning method is provided in an embodiment of the present invention, applied to a corresponding touch display device, wherein the touch display device comprises: 
     at least one touch chip transmitting touch driving signals and receiving touch sensing signals; 
     a plurality of touch driving lines connected to the touch chip; and 
     a plurality of touch sensing lines connected to the touch chip; wherein the touch chip scanning method comprises steps of: 
     transmitting a first touch driving signal to all of the touch driving lines by the touch chip; 
     detecting a first touch sensing signal of all of the touch sensing lines by the touch chip, wherein the touch sensing lines produce the first touch sensing signals according to the first touch driving signal and touch operations; 
     determining at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and a default rule by the touch chip; 
     transmitting a second touch driving signal to the to-be-scanned touch sensing line by the touch chip; 
     receiving a second touch sensing signal through the touch driving lines by the touch chip; 
     producing the second touch sensing signal according to the second touch driving signal and touch operations by the touch sensing lines; and 
     determining locations of the touch operations according to the second touch sensing signal by the touch chip; 
     wherein the touch driving lines are perpendicular to the touch sensing lines. 
     In the touch signal scanning method of the present invention, if the touch display device is a single point touch display device, the step of determining the at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and the default rule comprises: 
     determining if a touch sensing line with a maximum signal volume is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines. 
     In the touch signal scanning method of the present invention, the step of determining locations of the touch operations according to the second touch sensing signal by the touch chip comprises: 
     determining locations of the touch operations according to the touch driving lines and the to-be-scanned touch sensing line corresponding to the second touch sensing signal by the touch chip. 
     In the touch signal scanning method of the present invention, the touch display device is a single point touch display device, and the step of determining at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and the default rule comprises: 
     determining if a touch sensing line with a maximum signal volume and n touch sensing lines adjacent thereto are the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines, wherein n is a positive integer. 
     In the touch signal scanning method of the present invention, n is 1. 
     In the touch signal scanning method of the present invention, the step of transmitting the second touch signal to the to-be-scanned touch sensing line by the touch chip comprises: 
     progressively transmitting the second touch driving signal to the to-be-scanned touch sensing line by the touch chip. 
     In the touch signal scanning method of the present invention, the step of determining locations of the touch operations according to the second touch sensing signal by the touch chip comprises: 
     determining locations of touch operations according to the touch driving line corresponding to the second touch sensing signal and the touch sensing line corresponding to the second touch driving signal by the touch chip. 
     In the touch signal scanning method of the present invention, the touch display device is a multiple point touch display device, and the step of determining at least one touch to-be-scanned sensing line according to the first touch sensing signal of all of the touch sensing lines and the default rule comprises: 
     determining if a touch sensing line which has a signal volume greater than a preset value is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines. 
     In the touch signal scanning method of the present invention, the step of transmitting the second touch signal to the to-be-scanned touch sensing line by the touch chip comprises: 
     progressively transmitting the second touch driving signal to the to-be-scanned touch sensing line by the touch chip. 
     In the touch signal scanning method of the present invention, the step of determining locations of the touch operations according to the second touch sensing signal by the touch chip comprises: 
     determining locations of touch operations according to the touch driving line corresponding to the second touch sensing signal and the touch sensing line corresponding to the second touch driving signal by the touch chip. 
     A touch signal scanning method is provided in an embodiment of the present invention, applied to a corresponding touch display device, wherein the touch display device comprises: 
     at least one touch chip transmitting touch driving signals and receiving touch sensing signals; 
     a plurality of touch driving lines connected to the touch chip; and 
     a plurality of touch sensing lines connected to the touch chip; wherein the touch chip scanning method comprises steps of: 
     transmitting a first touch driving signal to all of the touch driving lines by the touch chip; 
     detecting a first touch sensing signal of all of the touch sensing lines by the touch chip, wherein the touch sensing lines produce the first touch sensing signals according to the first touch driving signal and touch operations; 
     determining at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and a default rule by the touch chip; 
     transmitting a second touch driving signal to the to-be-scanned touch sensing line by the touch chip; 
     receiving a second touch sensing signal through the touch driving lines by the touch chip; 
     producing the second touch sensing signal according to the second touch driving signal and touch operations by the touch sensing lines; and 
     determining locations of the touch operations according to the second touch sensing signal by the touch chip. 
     In the touch signal scanning method of the present invention, the touch display device is a single point touch display device, and the step of determining at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and the default rule comprises: 
     determining if a touch sensing line with a maximum signal volume is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines. 
     In the touch signal scanning method of the present invention, the step of determining locations of the touch operations according to the second touch sensing signal by the touch chip comprises: 
     determining locations of the touch operations according to the touch driving lines and the to-be-scanned touch sensing line corresponding to the second touch sensing signal by the touch chip. 
     In the touch signal scanning method of the present invention, the touch display device is a single point touch display device, and the step of determining at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and the default rule comprises: 
     determining if a touch sensing line with a maximum signal volume and n touch sensing lines adjacent thereto are the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines, wherein n is a positive integer. 
     In the touch signal scanning method of the present invention, n is 1. 
     In the touch signal scanning method of the present invention, the step of transmitting the second touch signal to the to-be-scanned touch sensing line by the touch chip comprises: 
     progressively transmitting the second touch driving signal to the to-be-scanned touch sensing line by the touch chip. 
     In the touch signal scanning method of the present invention, the step of determining locations of the touch operations according to the second touch sensing signal by the touch chip comprises: 
     determining locations of touch operations according to the touch driving line corresponding to the second touch sensing signal and the touch sensing line corresponding to the second touch driving signal by the touch chip. 
     In the touch signal scanning method of the present invention, the touch display device is a multiple point touch display device, and the step of determining at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and the default rule comprises: 
     determining if a touch sensing line which has a signal volume greater than a preset value is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines. 
     In the touch signal scanning method of the present invention, the step of transmitting the second touch signal to the to-be-scanned touch sensing line by the touch chip comprises: 
     progressively transmitting the second touch driving signal to the to-be-scanned touch sensing line by the touch chip. 
     In the touch signal scanning method of the present invention, the step of determining locations of the touch operations according to the second touch sensing signal by the touch chip comprises: 
     determining locations of touch operations according to the touch driving line corresponding to the second touch sensing signal and the touch sensing line corresponding to the second touch driving signal by the touch chip. 
     A touch signal scanning method of the present invention shortens touch scanning time through twice scanning operations and does not affect the touch result of a touch display device, so as to solve a technical problem of an existing touch signal scanning method which has too a short touch scanning time, so as to affect the touch result of the touch display result. 
     To allow the above description of the present invention to be more clear and comprehensive, there are preferred embodiments with the accompanying figures described in detail below. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a structural diagram of a touch display device applied to a touch signal scanning method of the present invention; 
         FIG. 2  is a flowchart of the touch signal scanning method according to the first preferred embodiment of the present invention; 
         FIG. 3  is a flowchart of the touch signal scanning method according to the second preferred embodiment of the present invention; 
         FIG. 4A  is a flowchart of the touch signal scanning method according to the third preferred embodiment of the present invention; 
         FIG. 4B  is a diagram of touch signals of the touch signal scanning method according to the third preferred embodiment of the present invention; and 
         FIG. 5  is a flowchart of the touch signal scanning method according to the fourth preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings. Furthermore, directional terms described by the present invention, such as upper, lower, front, back, left, right, inner, outer, side, longitudinal/vertical, transverse/horizontal, etc., are only directions by referring to the accompanying drawings, and thus the used directional terms are used to describe and understand the present invention, but the present invention is not limited thereto. 
     In the drawings, units with similar structures are represented with the same label. 
     Refer to  FIG. 1 , which is a structural diagram of a touch display device applied to a touch signal scanning method of the present invention. The touch display device  10  includes at least one touch chip  11 , a plurality of touch driving lines  12 , and a plurality of touch sensing lines  13 , The touch chip  11  is used to transmit touch driving signals and receive touch sensing signals; the touch chip  11  is connected to the touch driving lines  12  and the touch sensing lines  13  respectively. 
     When the touch display device  10  is used, the touch chip  11  progressively transmits touch driving signals to the touch driving lines  12 , and then the touch chip  11  receives touch sensing signals of the touch sensing lines  13 . Finally, the touch chip obtains the abscissa of the touch operation on the touch display panel according to the touch sensing signal, namely, the coordinates of touch sensing lines  13  (Rx 1  to Rxm); and the touch chip  11  obtains the ordinate of the touch operation on the touch display panel according to the return time of the touch sensing signals, namely, the coordinates of touch driving lines  12  (Tx 1  to Txn). The above operations of the touch chip needs to execute progressive scanning for all of the touch driving lines  12  of the whole touch display panel. When a touch display panel has a higher display resolution, the touch scanning of the touch chip  11  spends much time. If the touch scanning time of the touch chip  11  is continually reduced, the touch result of the touch display device  10  might be affected. 
     The touch signal scanning method of the present invention is applied for the touch display device  10  of  FIG. 1 , which can reduce the touch scanning time of the touch chip  11  without affecting the touch result of the touch display device. Refer to  FIG. 2 , which is a flowchart of the touch signal scanning method according to the first preferred embodiment of the present invention. The touch signal scanning method of the present invention comprises: 
     In a step S 201 , the touch chip transmits a first touch driving signal to all of the touch driving lines; 
     In a step S 202 , the touch chip detects a first touch sensing signal of all of the touch sensing lines; 
     In a step S 203 , the touch chip determines at least one to-be-scanned touch sensing line according to the first touch sensing signal of ail of the touch sensing lines and a default rule; 
     In a step S 204 , the touch chip transmits a second touch driving signal to the to-be-scanned touch sensing line; 
     In a step S 205 , the touch chip receives a second touch sensing signal through the touch driving lines; and 
     In a step S 206 , the touch chip determines locations of the touch operations according to the second touch sensing signal; 
     The touch signal scanning method of the preferred embodiment ends at the step S 206 . 
     The touch signal scanning method of the present preferred embodiment is described in detailed below. 
     At the step S 201 , the touch chip transmits the first touch driving signal to all of the touch driving lines; then, go to the step S 202 . 
     At the step S 202 , the touch sensing lines (Rx 1  to Rxm) produce the first touch sensing signal according to the first touch driving signal of the touch driving line and touch operations of the touch display panel; then, the touch chip detects a first touch sensing signal of all of the touch sensing lines; then, go to the step S 203 . 
     At the step S 203 , the touch chip determines at least one to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines and a default rule; the default rule is based on user requirements and requirements of the touch display device; then, go to the step S 204 . 
     At the step S 204 , the touch chip transmits a second touch driving signal to the to-be-scanned touch sensing line. The touch chip executes the second time scanning for the to-be-scanned touch sensing line. From the step S 201  to step S 203 , one overall scanning and the default rule reduces the second time scanning area, so as to consume less time at the second scanning; then, go to the step S 205 . 
     At the step S 205 , the touch sensing lines produces the second touch sensing signal according to the second touch driving signal and touch operations of the touch display panel; then, the touch chip detects the second touch sensing signal of the touch driving line; then, go to the step S 206 . 
     At the step S 206 , the touch chip obtains the location of the touch operation which the second touch sensing drives. 
     As a result, the touch signal scanning process of the touch signal scanning method of the present preferred embodiment is completed. 
     The touch signal scanning method of the present invention shortens touch scanning time through twice scanning operations and does not affect the touch result of a touch display device. 
     Refer to  FIG. 3 , which is a flowchart of the touch signal scanning method according to the second preferred embodiment of the present invention. The touch signal scanning method is used in a single point touch display device, comprising: 
     In a step S 301 , the touch chip transmits a first touch driving signal to all of the touch driving lines; 
     In a step S 302 , the touch chip detects a first touch sensing signal of all of the touch sensing lines; 
     In a step S 303 , the touch chip determines if a touch sensing line with a maximum signal volume is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines; 
     In a step S 304 , the touch chip transmits a second touch driving signal to the to-be-scanned touch sensing line; 
     In a step S 305 , the touch chip receives a second touch sensing signal through the touch driving line; and 
     In a step S 306 , the touch chip determining locations of the touch operations according to the touch driving lines and the to-be-scanned touch sensing line corresponding to the second touch sensing signal. 
     The touch signal scanning method of the present preferred embodiment is described in detailed below. 
     The step S 301  and the step S 302  of the touch signal scanning method of the present preferred embodiment are the same as the step S 201  and the step S 202  of the first preferred embodiment. 
     At the step S 303 , the touch chip sets the touch sensing line which has maximum signal volume as the to-be-scanned touch sensing line according to the first sensing line of the touch sensing line. There is only one touch operation point of the signal point touch display device, so that the signal volume of the sensing signal of the touch sensing line which has a touch operation is the largest. Then, go to the step S 304 . 
     The step S 304  and the step S 305  of the touch signal scanning method of the present preferred embodiment are the same as the step S 204  and the step S 205  of the first preferred embodiment. 
     At the step S 306 , the touch chip obtains the touch driving line corresponding to the second touch sensing signal at the step S 305  and obtains the to-be-scanned touch sensing line at the step S 303 . The intersection of the touch sensing line of the second touch sensing signal and the to-be-scanned touch sensing line is the single point touch operation location. 
     As a result, the touch signal scanning process of the touch signal scanning method of the present preferred embodiment is completed. 
     According to characteristics of single point touch operations of a single point touch display device, the touch signal scanning method of the present invention determines locations of the single point touch operations through twice scanning operations, so as to shorten touch scanning time and do not affect the touch result of the single point touch display device. 
     Referring to  FIG. 4A  and  FIG. 4B ,  FIG. 4A  is a flowchart of the touch signal scanning method according to the third preferred embodiment of the present invention,  FIG. 4B  is a diagram of touch signals of the touch signal scanning method according to the third preferred embodiment of the present invention. The touch signal scanning method of the present preferred embodiment is used in a single point touch display device, and comprises: 
     In a step S 401 , the touch chip transmits a first touch driving signal to all of the touch driving lines; 
     In a step S 402 , the touch chip detects a first touch sensing signal of all of the touch sensing lines; 
     In a step S 403 , the touch chip determines if a touch sensing line with a maximum signal volume and n touch sensing lines adjacent thereto are the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines; 
     In a step S 404 , the touch chip progressively transmits a second touch driving signal to the to-be-scanned touch sensing line; 
     In a step S 405 , the touch chip receives a second touch sensing signal through the touch driving line; and 
     In a step S 406 , the touch chip determines locations of touch operations according to the touch driving line corresponding to the second touch sensing signal and the touch sensing line corresponding to the second touch driving signal. 
     The touch signal scanning method of the present preferred embodiment is described in detailed below. 
     At the step S 401 , the touch chip transmits a first touch driving signal to all of the touch driving lines (Tx 1 , Tx 2  . . . Txn) at the same time, as illustrated in  FIG. 4B . Then, go to the step S 402 . 
     At the step S 402 , the touch sensing lines (Rx 1 , Rx 2  . . . Rxm) produce the first touch sensing signals according to the first touch driving signal of the touch driving line and touch operations on the touch display panel; and then, the touch chip detects a first touch sensing signal of all of the touch sensing lines; then, go to the step S 403 . 
     At the step S 403 , the touch chip sets the touch sensing line Rxi which has the maximum signal volume as the to-be-scanned touch sensing line according to the first touch sensing signal of the touch sensing line. There is only one touch operation point of the single point touch display device, so that the signal volume of the sensing signal of the touch sensing line which has a touch operation is the largest. Simultaneously, to avoid detection error, set n touch sensing lines adjacent to the touch sensing line with the maximum signal volume Rxi as the to-be-scanned touch sensing lines. Wherein n is a positive integer, and the preferred value is 1. At the present step, three to-be-scanned sensing lines are set, and that are the touch sensing line Rx(i−1), the touch sensing line Rxi, and the touch sensing line Rx(i+1). Then, go to the step S 404 . 
     At the step S 404 , the touch chip progressively transmits the second touch driving signal to the to-be scanned touch sensing lines (Rx(i−1), Rxi, Rx(i+1)) which are set at the step S 403 . The touch chip executes the second time scanning for the to-be-scanned touch sensing line. From the step S 401  to the step S 403 , the once overall scanning and the default rule of the maximum signal volume reduce the second time scanning area, so that the time consuming of the second time scanning is lower. Then, go the step S 405 . 
     At the step S 405 , the touch sensing lines produces the second touch sensing signal according to the second touch driving signal and touch operations of the touch display panel; then, the touch chip detects the second touch sensing signal of the touch driving line; then, go to the step S 406 . 
     At the step S 406 , the touch chip obtains a touch driving line corresponding to the second touch sensing signal at the step S 405 , and obtains the to-be-scanned touch sensing line at the step S 403 . The intersection of the touch driving line corresponding to the second touch sensing signal and the to-be-scanned touch sensing line is the position of the single touch operation. At the step S 404 , the second touch driving signal is transmitted to the to-be-scanned touch sensing line Rxi. The touch chip detects that the touch driving line Txi has the second touch sensing signal, and the intersection of the to-be-scanned touch sensing line Rxi and the touch driving line Txi is set as the position of single point touch operation. 
     As a result, the touch signal scanning process of the touch signal scanning method of the present preferred embodiment is completed. 
     In the touch signal scanning method of the second preferred embodiment of the present invention, a plurality of to-be-scanned touch sensing line are disposed, so as to shorten the touch scanning time and improve the accuracy of the touch operation detection. 
     Refer to  FIG. 5 , which is a flowchart of the touch signal scanning method according to the fourth preferred embodiment of the present invention. The touch signal scanning method is used to a multiple point touch display device, comprising: 
     In a step S 501 , the touch chip transmits a first touch driving signal to all of the touch driving lines; 
     In a step S 502 , the touch chip detects a first touch sensing signal of all of the touch sensing lines; 
     In a step S 503 , a touch sensing line which has the signal volume greater than a preset value is determined if it is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines; 
     In a step S 504 , the touch chip progressively transmits a second touch driving signal to the to-be-scanned touch sensing line; 
     In a step S 505 , the touch chip receives a second touch sensing signal through the touch driving lines; and 
     In a step S 506 , the touch chip determines locations of touch operations according to the touch driving line corresponding to the second touch sensing signal and the touch sensing line corresponding to the second touch driving signal. 
     The step S 501  and the step S 502  of the touch signal scanning method of the present preferred embodiment are the same as the step S 401  and the step S 402  of the third preferred embodiment. 
     At the step S 503 , the touch chip determining if a touch sensing line which has the signal volume greater than a preset value is the to-be-scanned touch sensing line according to the first touch sensing signal of all of the touch sensing lines. The multiple point touch display device has at least one touch operation point, so as to determine the touch sensing line which has the signal volume greater than a preset value has a touch operation, and a plurality of to-be-scanned touch sensing lines are disposed here. Then, turn to the step S 504 . 
     At the step S 504 , the touch chip progressively transmits the second touch driving signal to the to-be scanned touch sensing lines which are set at the step S 503 . The touch chip executes the second time scanning for the to-be-scanned touch sensing line. From the step S 501  to the step S 503 , the once overall scanning and the default rule of the signal volume setting value reduce the second time scanning area, so that the time consumption of the second time scanning is lower. Then, go the step S 505 . 
     The step S 505  of the touch signal scanning method of the present preferred embodiment is the same as the step S 405  of the third preferred embodiment. 
     At the step S 506 , the touch chip obtains a touch driving line corresponding to the second touch sensing signal at the step S 505 , and obtains the to-be-scanned touch sensing line at step S 503 . A plurality of to-be-connected touch sensing lines can be obtained at the step S 503 , so as to obtain a plurality of the corresponding touch driving lines at the step S 505 ; the intersections of multiple touch driving lines corresponding to the second touch sensing signal and multiple to-be-scanned touch sensing lines are positions of the touch operations. 
     According to characteristics of multiple point touch operations of a multiple point touch display device, the touch signal scanning method of the present invention determines locations of the multiple point touch operations through twice scanning operations, so as to shorten touch scanning time and not affect the touch result of the multiple point touch display device. 
     A touch signal scanning method of the present invention shortens touch scanning time through twice scanning operations and does not affect the touch result of a touch display device, so as to solve a technical problem of an existing touch signal scanning method which has too short touch scanning time, so as to affect the touch result of the touch display result. 
     In summary, the present invention has been disclosed with preferred embodiments thereof, but the above described preferred embodiments are not intended to limit the present invention. Those who are skilled in the art can make many changes and modifications to the described embodiment which can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.