Patent Application
20210225216
The application claims priority to the Chinese patent application No. 201710322072.1, filed on May 9, 2017 to CNIPA, and entitled “Touch Display Panel, Test Method thereof and Display Device”, which is incorporated herein by reference in its entirety.
Embodiments of the present disclosure relate to a touch display panel, a test method thereof and a display device.
Touch display driver integration (TDDI) technology integrates a touch chip and a display chip into a single chip. Before the advent of TDDI technology, the system architecture will have some display noise as the display chip is separated from the touch chip. The TDDI technology will achieve better effect in the management of noise due to the realization of unified control, so the TDDI technology has strong technical advantage and market competitiveness.
Embodiments of the present disclosure provide a touch display panel, the testing method thereof and a display device.
An embodiment of the present disclosure provides a touch display panel, comprising: a base substrate, a plurality of touch electrodes in an array provided in a touch area of the base substrate, at least four test signal lines in a non-touch area of the base substrate, and a plurality of touch traces configured to connect the touch electrodes and corresponding test signal lines. Each touch electrode and peripheral touch electrodes thereof correspond to different test signal lines; and the peripheral touch electrodes refer to other touch electrodes adjacent to the touch electrode and arranged along the row direction, the column direction and the diagonal direction of the touch electrode.
In a possible implementation, in the touch display panel provided by the embodiment of the present disclosure, the at least four test signal lines is four test signal lines; and two touch electrodes, adjacent to the touch electrode, in the row direction, the column direction and the diagonal direction correspond to a same test signal line.
In a possible implementation, in the touch display panel provided by the embodiment of the present disclosure, further comprising: a plurality of metal test pads in the non-touch area and respectively connected with the test signal lines, in which each pf the metal test pads is configured to be connected with an input end of a resistance detector in the test period, and input a test signal into a corresponding test signal line.
In a possible implementation, in the touch display panel provided by the emebodiment of the present disclosure, further comprising: a plurality of switching transistors in the non-touch area, and the touch traces are respectively connected to corresponding test signal lines through the switching transistors.
In a possible implementation, in the touch display panel provided by the emebodiment of the present disclosure, further comprising: switching signal lines in the non-touch area and connected with gate electrodes of the switching transistors.
In a possible implementation, in the touch display panel provided by the emebodiment of the present disclosure, further comprising: metal pads in the non-touch area and respectively connected with the touch traces, in which the metal pads are provided respectively between the switching transistors and corresponding touch electrodes and configured to connect touch detection chips, respectively.
In a possible implementation, in the touch display panel provided by the emebodiment of the present disclosure, the touch electrodes and the touch traces are arranged in different layers; and the touch electrodes are connected with corresponding touch traces via through holes, respectively.
In a possible implementation, in the touch display panel provided by the emebodiment of the present disclosure, the touch electrodes are multiplexed as common electrodes, respectively.
An embodiment of the present disclosure also provides a test method of the touch display panel, comprising: detecting a resistance between any two test signal lines; and determining whether the detected resistance is less than a default threshold, and if so, determining a short circuit presents between two touch electrodes or between two touch traces connected with the two test signal lines of which the resistance is less than the default threshold.
In a possible implementation, in the test method provided by the emebodiment of the present disclosure, further comprising: inputting a same test signal into the test signal lines before or after detecting the resistance between any two test signal lines; and detecting whether a display brightness at a position of each touch electrode is abnormal, and if so, determining an open circuit presents on the touch trace corresponding to the abnormal display position.
In a possible implementation, in the test method provided by the emebodiment of the present disclosure, the touch display panel further includes a plurality of switching transistors in the non-touch area; the touch traces are respectively connected to corresponding test signal lines through the switching transistors; and further comprising: switching on the switching transistors respectively before detecting the resistance between any two test signal lines and inputting a same test signal into the test signal lines, so that the touch traces can be connected with corresponding test signal lines, respectively.
In a possible implementation, in the test method provided by the emebodiment of the present disclosure, the touch display panel further includes: switching signal lines in the non-touch area and connected with the gate electrodes of the switching transistors, respectively; and switching on the switching transistors includes inputting ‘on’ signals into the switching signal lines, respectively.
An embodiment of the present disclosure also provides a test method of the touch display panel, comprising: inputting a same test signal into the test signal lines; and detecting whether a display brightness at the position of each touch electrode is abnormal, and if so, determining an open circuit presents on the touch trace corresponding to the abnormal display position.
An embodiment of the present disclosure also provides a display device, comprising: the touch display panel.
Embodiments of the present disclosure will be described in more detail below with reference to accompanying drawings to allow an ordinary skill in the art to more clearly understand embodiments of the present disclosure, in which:
Technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the disclosure. It is apparent that the described embodiments are just a part but not all of the embodiments of the disclosure. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any creative work, which shall be within the scope of the disclosure.
In a touch display panel adopting TDDI technology, a common electrode layer is divided into a plurality of touch units, and by adoption of time-sharing multiplexing, that is, in the display period, the touch units are act as common electrodes and configured to provide a common voltage (Vcom), and in the touch period, the touch units act as touch electrodes and configured to provide touch capacitance signals, so as to achieve the touch and display integration effect. In the manufacturing process of the touch display panel, usually, a substrate is manufactured at first and then a driver IC and a printed circuit board (PCB) are pressed together. In the process of manufacturing the substrate, the display effect in this stage is tested, and meanwhile, touch electrodes and touch traces (Tx) connected with the touch units are also required for test, or else, if a poor touch is detected in the next manufacturing stage, materials, such as the bonded chip and the PCB will be wasted, an unnecessary production cost is added.
In the process of testing the touch display panel, due to the large number of the touch units, bonding pins connected with the touch units are densely packed, and before the module process, an electrical signal detector cannot be used to respectively test the electrical properties of each pin. Generally, all of the Tx traces of the touch units are connected together through switches; in the process of image detection, Vcom signals are supplied in a unified form; and if a Tx trace is open, the touch display panel will have chessboard squares and achieve poor display. However, the method can only detect the open-circuit of the Tx trace or the touch unit and cannot detect the short-circuit of the Tx trace or the touch unit. If the short circuit of the Tx trace or the touch unit cannot be detected, materials, such as the bonded chip and the PCB will also be wasted, an unnecessary production cost is added.
Detailed description will be given below to the preferred embodiments of the touch display panel, the test method and the display device, provided by embodiments of the present disclosure, with reference to the accompanying drawings. The size and the shape of components in the accompanying drawings do not reflect the true scale and are only intended to illustrate the content of the present disclosure.
An embodiment of the present disclosure provides a touch display panel, which, as shown in
Each touch electrode 101 and the touch electrodes 101 at the periphery thereof correspond to different test signal lines 201.
The peripheral touch electrodes 101 refer to other touch electrodes 101 adjacent to one touch electrode 101 and arranged along the row direction, the column direction and the diagonal direction.
In the touch display panel provided by the embodiment of the present disclosure, at least four test signal lines 201 are disposed in the non-touch area 200, and one touch electrode 101 and the peripheral touch electrodes 101 correspond to different test signal lines 201, so whether the touch electrode 101 or the touch trace 102 is shorted can be subsequently determined by detecting the resistance between any two test signal lines 201.
In an example, the touch display panel may be a liquid crystal display (LCD) panel or an organic light-emitting diode (OLED) display panel and may also be a display panel of other types. In the touch area 100 of the touch display panel, the touch electrodes 101 arranged in an array may be arranged in any layer in the touch display panel and may also partially or entirely utilize electrodes in the touch display panel. For instance, when the touch display panel is an LCD panel, common electrodes may be multiplexed as the touch electrodes 101, namely the common electrode is divided into a plurality of sub-electrodes which correspond to pixel units, and the sub-electrodes are subjected to time-sharing driving and act as the common electrodes in the display period, and act as the touch electrodes 101 in the touch period. In an example, the touch electrodes 101 may be independently arranged in a layer, however, the embodiment of the present disclosure is not limited thereto.
Description is given in
For instance, during the electrical signal detection on the touch display panel, whether the touch trace 102 in the touch display panel is open may also be detected. For instance, a same test signal may be inputted into the test signal lines 201, for example, a same common voltage (Vcom) signal is inputted. As the test signals inputted into the test signal lines 201 are the same, the display brightness at positions of the touch electrodes 101 shall be roughly the same. If the touch trace 102 corresponding to certain touch electrode 101 is open, the display brightness at the position of the touch electrode 101 will be abnormal, so whether the touch trace 102 is open may be detected by detecting whether the display brightness at the position of the touch electrode 101 is abnormal. In this way, the touch display panel having an open circuit can be intercepted, so the touch display panel cannot enter the subsequent process again, and resource waste can be avoided.
As shown in
For instance, in the touch display panel provided by the embodiment of the present disclosure, as shown in
In the row direction, the column direction and the diagonal direction, two touch electrodes 101 adjacent to the touch electrode 101 correspond to a same test signal line 201. For instance, the touch electrode in the second row and the second column in
Based on the above analysis, the number of the test signal lines 201 is at least four. When the number of the test signal lines 201 is four, on the one hand, it can be ensured that all the short-circuit conditions can be detected, so as to avoid the missed detection of the short-circuit conditions; in addition, when the number of the test signal lines 201 used in the case of being able to detect all the short circuits is minimum, in the process of electrical signal detection, the resistance between any two test signal lines 201 needed to be detected. When the number of the test signal lines 201 is set to be four, in the process of electrical signal detection, the resistance between any two test signal lines 201 can be obtained only by test for six times, so the detection time is the shortest, and the cost can be saved.
Moreover, for instance, the touch display panel provided by an embodiment of the present disclosure, as shown in
The metal test pad 204 is configured to be connected with an input end of a resistance detector 300 in the test period, and input a test signal into corresponding test signal line 201.
By arrangement of the metal test pads 204 connected with the test signal lines 201, as the width of the metal test pad 204 is generally much greater than the width of the test signal line 201, in the test period, the resistance detector 300 is electrically connected with the test signal line 201 through the metal test pad 204. Compared with the case that the resistance detector 300 is directly connected with the test signal line 201, the operation is more convenient, and error test, due to poor connection between the resistance detector 300 and the test signal line 201, can also be avoided. Similarly, in the process of detecting an open circuit, test signals are inputted into the test signal lines 201 through the metal test pads 204, which is also relatively easier to operate.
As shown in
The touch traces 102 are respectively connected to corresponding test signal lines 201 through the switching transistors 202.
For instance, source electrodes (or drain electrodes) of the switching transistors 202 may be connected with the touch traces 102, and drain electrodes (or source electrodes) are connected with corresponding test signal lines 201. In the test period, before the short-circuit or the open-circuit detection, a high level is applied to the switching transistors 202, so that the touch traces 102 can be connected with corresponding test signal lines 201; and after the short-circuit or the open-circuit detection, a low level is applied to the switching transistors 202, so that the touch traces 102 can be disconnected from corresponding test signal lines 201, which can prevent the test signal lines 201 from affecting the display or touch detection effect of the touch display panel in the display period or the touch period.
Moreover, for instance, the touch display panel provided by an embodiment of the present disclosure may also comprise: switching signal lines 203 disposed in the non-touch area 200 and connected with gate electrodes of the switching transistors 202.
As the switching transistors 202 can be simultaneously switched on and off, the switching signal lines 203 may be configured to be connected with the switching transistors 202. In this way, in the test period, before the short-circuit or the open-circuit detection, the touch traces 102 are connected with corresponding test signal lines 201 by applying a high level to the switching signal lines 203; and after the short-circuit or the open-circuit detection, the touch traces 102 are disconnected from corresponding test signal lines 201 by applying a low level to the switching signal lines 203, which can avoid the operation of the switching transistors 202 one by one and making the operation more convenient.
Moreover, for instance, the touch display panel provided by an embodiment of the present disclosure, as shown in
The metal pad 205 is disposed between the switching transistor 202 and corresponding touch electrode 101 and connected with a touch detection chip.
Only the touch display panel that has not been detected to have a short circuit or an open circuit in the test period is bound with a touch detection chip, and the metal pad 205 bonded with the touch detection chip is reserved, as shown in
For instance, in the touch display panel provided by the embodiments of the present disclosure, as shown in
The touch electrodes 101 are connected with corresponding touch traces 102 via through holes 103.
In the figure, a circle on the touch trace 102 represents the through hole 103, and one touch electrode 101 generally corresponds to a plurality of through holes 103 and is connected with the touch trace 102, which can avoid the open circuit between the touch electrode 101 and corresponding touch trace 102 due to poor contact.
For instance, in the touch display panel provided by an embodiment of the present disclosure, the touch electrodes 101 are multiplexed as common electrodes, namely a common electrode layer is divided into a plurality of sub-electrodes which correspond to pixel units, respectively, and the sub-electrodes are subjected to time-sharing driving and act as the common electrodes in the display period and act as the touch electrodes 101 in the touch period, so that the touch electrodes 101 can be multiplexed as the common electrodes. The touch electrodes 101, for instance, are self-capacitance electrodes, or may be touch sensing electrodes or touch driving electrodes in mutual-capacitance electrodes, and the embodiment of the present disclosure is not limited thereto.
Based on the same concept, an embodiment of the present disclosure also provides a test method of the above touch display panel. As the principle of solving problems of this test method is similar to that of the above touch display panel, the implementation of the test method may refer to the implementation of the above touch display panel. No further description will be given here.
The embodiment of the present disclosure also provides a test method of the above touch display panel, which, as shown in
S401: detecting the resistance between any two test signal lines; and
S402: determining whether the detected resistance is less than a default threshold, and if so, determining a short circuit presents between two touch electrodes or between two touch traces connected with the two test signal lines of which the resistance is less than the default threshold.
As shown in
Moreover, for instance, the test method provided by an embodiment of the present disclosure, as shown in
S501: inputting a same test signal into the test signal lines; and
S502: detecting whether the display brightness at a position of each touch electrode is abnormal or not, and if so, determining an open circuit presents on the touch trace corresponding to the abnormal display position.
As shown in
The test method provided the embodiment of the present disclosure can determine whether the touch electrode or the touch trace is shorted and can also determine whether the touch trace is open. The operation S501 may be executed before the operation S401 and may also be executed after the operation S401. The sequence of short-circuit detection and open-circuit detection is not limited here.
As shown in
Before the operations S401 and S501, the test method may also comprise: switching on the switching transistors, so that the touch traces can be connected with corresponding test signal lines.
For instance, a high level may be applied to the gate electrodes of the switching transistors 202, so that the touch traces 102 can be connected with corresponding test signal lines 201; and after the operations S402 and S502, a low level is applied to the switching transistors 202, so that the touch traces 102 can be disconnected from corresponding test signal lines 202, which can avoid the test signal lines 201 from affecting the display or touch detection effect of the touch display panel in the display period or the touch period.
See also
The operation of switching on the switching transistors, for instance, includes: inputting on signals into the switching signal lines.
For instance, the touch traces 102 can be connected with corresponding test signal lines 201 by applying a high level to the switching signal lines 203; and after the short-circuit or the open-circuit detection, the touch traces 102 are disconnected from corresponding test signal lines 201 by applying a low level to the switching signal lines 203, which can avoid the operation of the switching transistors 202 one by one and making the operation more convenient.
Based on the same concept, an embodiment of the present disclosure also provides another test method of the above touch display panel. As the principle of solving problems of this test method is similar to that of the above touch display panel, the implementation of the test method may refer to the implementation of the above touch display panel. No further description will be given here.
The embodiment of the present disclosure provides another test method of the above touch display panel, which comprises: inputting a same test signal into the test signal lines; and detecting whether the display brightness at a position of each touch electrode is abnormal, and if so, determining an open circuit presents on the touch trace corresponding to the abnormal display position.
The test method provided by the embodiment is similar to that of the test method as shown in
Based on the same concept, the embodiment of the present disclosure also provides a display device, which comprises the above touch display panel. The display device may be any product or component with display function, such as a mobile phone, a tablet PC, a TV, a display, a notebook computer, a digital album or a navigator. As the principle of solving problems of the display device is similar to that of the touch display panel, the implementation of the display device may refer to the implementation of the touch display panel. No description will be given to the repeated parts.
In the touch display panel, the test method thereof and the display device provided by the embodiment of the present disclosure, at least four test signal lines are arranged in the non-touch area, and the touch electrodes and the peripheral touch electrodes correspond to different test signal lines, so whether the touch electrodes or the touch traces are shorted may be subsequently determined by detecting the resistance between any two test signal lines. In addition, whether the touch traces are open may also be determined by inputting a same test signal into the test signal lines and detecting whether the display brightness at the position of each touch electrode is abnormal. In this way, the touch display panel having the short-circuit or the open-circuit can be intercepted, so that the touch display panel does not enter the subsequent process, and the process yield in the module stage can be improved and the resource waste can be avoided.
The foregoing is only the exemplary embodiments adopted for illustration of the principles of the present disclosure, but the embodiments of the present disclosure are not limited thereto. Various variations and improvements may be made by one of ordinary skill in the art without departing from the spirit and the principle of the embodiments of the present disclosure. These variations and improvements shall also fall within the scope of protection of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201710322072.1 | May 2017 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/077722 | 3/1/2018 | WO | 00 |
