CN111781540A - Touch display device and test method thereof - Google Patents
Touch display device and test method thereof Download PDFInfo
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- CN111781540A CN111781540A CN202010624278.1A CN202010624278A CN111781540A CN 111781540 A CN111781540 A CN 111781540A CN 202010624278 A CN202010624278 A CN 202010624278A CN 111781540 A CN111781540 A CN 111781540A
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- 238000001514 detection method Methods 0.000 claims abstract description 134
- 238000012360 testing method Methods 0.000 claims abstract description 64
- 230000002159 abnormal effect Effects 0.000 claims description 52
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/55—Testing for incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The embodiment of the invention discloses a touch display device and a test method thereof, wherein the display device comprises: the display area comprises m touch electrode blocks and m touch line groups which are arranged in an array, one touch electrode block is electrically connected with one touch line group, m power voltage blocks and m power line groups which are arranged in an array are electrically connected with one power voltage block, and the first end of each touch line group is electrically connected with the first end of the corresponding power line group through a through hole; the non-display area comprises m switching devices, the output ends of the m switching devices are respectively and correspondingly electrically connected with the second ends of the m touch line groups, and the input ends of the m switching devices receive detection voltage signals; and in the touch detection stage, the m switching devices are simultaneously conducted, so that the detection voltage signals are correspondingly transmitted to the m touch electrode blocks. According to the invention, a touch test mode is combined with display driving, and a picture display mode is directly adopted for touch test, so that the detection accuracy and the interception efficiency are effectively improved.
Description
Technical Field
The present invention relates to touch technologies, and in particular, to a touch display device and a test method thereof.
Background
With the rapid development of mobile terminals, people have higher and higher requirements for using mobile terminals, and based on the higher and higher requirements, various functions are gradually integrated in the mobile terminals to improve the use diversity of the mobile terminals. Most of the existing mobile terminals are integrated with touch functions, so that display and touch integration is realized. In the touch display panel integrated with display and touch functions, the touch electrodes for realizing the touch function can be of a self-capacitance structure or a mutual capacitance structure.
Before leaving the factory, the touch display panel needs to be subjected to various detections to screen out defective products and keep good products, including detection of the touch function of the touch display panel. For the self-capacitance type touch electrode structure, the touch detection mode is that signals are transmitted to the touch electrode blocks through the FPC, and the capacitance charge quantity of each touch electrode block is received through detection software to judge whether the touch electrode blocks are abnormal or not. The touch detection mode has low efficiency and large error.
Disclosure of Invention
The embodiment of the invention provides a touch display device and a test method thereof, which are used for improving detection accuracy and interception efficiency.
An embodiment of the present invention provides a touch display device, including: a display area and a non-display area;
the display area comprises a touch electrode layer and a power voltage layer which are stacked and insulated, the touch electrode layer comprises m touch electrode blocks and m touch line groups which are arranged in an array, one touch electrode block is electrically connected with one touch line group, the power voltage layer comprises m power voltage blocks and m power line groups which are arranged in an array, one power voltage block is electrically connected with one power line group, the m touch electrode blocks and the m power voltage blocks are respectively arranged correspondingly, and the first ends of the touch line groups are electrically connected with the first ends of the corresponding power line groups through via holes;
the non-display area comprises a test switch module positioned at the second end of the touch line group, the test switch module comprises m switch devices, the output ends of the m switch devices are respectively and correspondingly electrically connected with the second ends of the m touch line groups, and the input ends of the m switch devices receive detection voltage signals;
and in the touch detection stage, the m switching devices are simultaneously conducted, so that the detection voltage signals are correspondingly transmitted to the m touch electrode blocks.
Based on the same inventive concept, an embodiment of the present invention further provides a method for testing the touch display device, including:
in the touch detection stage, the m switching devices are controlled to be simultaneously conducted, so that the detection voltage signals are correspondingly transmitted to the m touch electrode blocks;
and judging whether the touch line group is abnormal or not according to a display picture of the touch display device.
In the embodiment of the invention, the first end of the touch line group is electrically connected with the first end of the corresponding power line group through the via hole; the output end of the switch device is electrically connected with the second end of the corresponding touch line group, and the input end of the switch device receives a detection voltage signal TPD; and in the touch detection stage, the m switching devices are simultaneously conducted, so that the detection voltage signal TPD is correspondingly transmitted to the m touch electrode blocks and the m power supply voltage blocks. Therefore, whether the routing of the touch line group is abnormal can be judged according to whether the image displayed by the touch display device is abnormal. Carry out touch-control with current direct touch-control and walk line anomaly detection and compare, through rational utilization power voltage piece, combine together touch-control test mode and display drive, directly adopt the mode of picture display to carry out touch-control test, the efficiency of the precision and the interception that can effectual promotion detected like this promotes the productivity, reduces the missed measure rate, has realized touch-control detection and has shown the detection integration.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic diagram of a touch display device according to an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view taken along A-A' of FIG. 1;
FIG. 3 is a diagram illustrating a normal display frame during a touch detection phase;
FIG. 4 is a schematic diagram of an actual display screen during a touch detection phase;
fig. 5 is a schematic diagram of a touch display device according to an embodiment of the invention;
FIG. 6 is a comparison diagram of the normal display frame and the abnormal display frame in the first frame touch detection stage shown in FIG. 5;
FIG. 7 is a comparison diagram of the normal display frame and the abnormal display frame in the second frame touch detection stage shown in FIG. 5;
fig. 8 is a schematic diagram of a touch display device according to an embodiment of the invention;
FIG. 9 is a comparison diagram of the normal display frame and the abnormal display frame in the first frame touch detection stage shown in FIG. 8;
FIG. 10 is a comparison diagram of the normal display frame and the abnormal display frame in the second frame touch detection stage shown in FIG. 8;
FIG. 11 is a schematic diagram of a power supply voltage block;
fig. 12 is a schematic diagram of a touch display device according to an embodiment of the invention;
fig. 13 is a flowchart illustrating a testing method of a touch display device according to an embodiment of the invention;
fig. 14 is a flowchart of a testing method of a touch display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a schematic view of a touch display device according to an embodiment of the invention is shown, and fig. 2 is a partial cross-sectional view taken along a-a' of fig. 1. The touch display device provided by the embodiment integrates a touch function and a display function. The touch display device includes: a display area 1 and a non-display area 2; the display area 1 comprises a touch electrode layer and a power voltage layer which are stacked and insulated, wherein the touch electrode layer comprises m touch electrode blocks 11 and m touch line groups 12 which are arranged in an array, one touch electrode block 11 is electrically connected with one touch line group 12, the power voltage layer comprises m power voltage blocks 13 and m power line groups 14 which are arranged in an array, one power voltage block 13 is electrically connected with one power line group 14, the m touch electrode blocks 11 and the m power voltage blocks 13 are respectively arranged correspondingly, and the first end of each touch line group 12 is electrically connected with the first end of the corresponding power line group 14 through a through hole 2 a; the non-display area 2 includes a test switch module 3 located at the second end of the touch line group 12, the test switch module 3 includes m switch devices 31, output ends of the m switch devices 31 are respectively and correspondingly electrically connected with the second ends of the m touch line groups 12, and input ends of the m switch devices 31 receive the detection voltage signal TPD; in the touch detection stage, the m switching devices 31 are turned on simultaneously, so that the detection voltage signal TPD is correspondingly transmitted to the m touch electrode blocks 11.
In this embodiment, the display area 1 includes a touch electrode layer and a power voltage layer stacked and insulated from each other, and the touch electrode layer and the power voltage layer are insulated from each other by an insulating layer.
The touch electrode layer comprises m touch electrode blocks 11 and m touch line groups 12 which are arranged in an array, wherein the touch electrode blocks 11 and the touch line groups 12 are arranged in a stacked mode, and the touch line groups 12 are electrically connected with the corresponding touch electrode blocks 11 through via holes. The touch line group 12 transmits a touch signal, and the specific touch line group 12 transmits a touch driving signal to the corresponding touch electrode block 11, and then outputs a touch sensing signal generated by the touch electrode block 11 according to touch to the touch chip to implement touch detection. It can be understood that the touch wire group 12 includes one or more touch wires electrically connected to the same touch electrode block 11, one or more connection points between one touch wire and the corresponding touch electrode block 11 may be one or more, the number of touch wires in the touch wire group is related to the touch driving capability, and related practitioners can reasonably set the number of touch wires in the touch wire group and the positions and the number of the connection points according to the needs of products. In this embodiment, the example is only given by the case that the touch line group includes one touch lead and is electrically connected to the touch electrode block by using two connection points, but the embodiment is not limited thereto.
The power voltage layer includes m power voltage blocks 13 and m power line groups 14 arranged in an array, wherein the power voltage blocks 13 and the power line groups 14 are stacked, and the power line groups 14 are electrically connected with the corresponding power voltage blocks 13 through via holes. The power line group 14 transmits a power voltage signal to display the pixels in the display area. Related practitioners can reasonably set the number of the power supply lead wires in the power supply wire group and the positions and the number of the connection points between the power supply lead wires and the power supply voltage block according to the needs of products. In the present embodiment, the power line group includes one power lead and is electrically connected to the power voltage block by using three connection points, but the present invention is not limited thereto. It is understood that the different metal film layers are insulated by the insulating layer, and the stacked structure of the touch electrode layer and the power voltage layer shown in fig. 2 is only an example and is not limited thereto.
In this embodiment, the non-display area 2 includes a test switch module 3 located at a second end of the touch line set 12. The m touch electrode blocks 11 and the m power voltage blocks 13 are respectively and correspondingly arranged, the touch line group 12 electrically connected with the touch electrode blocks 11 is electrically connected with the power line group 14 electrically connected with the corresponding power voltage block 13 through a via hole 2a, wherein the touch line group 12 is electrically connected with the corresponding power line group 14 at one end far away from the test switch module 3 through the via hole 2 a.
In this embodiment, the test switch module 3 includes m switch devices 31, one switch device 31 is disposed corresponding to one touch line group 12, an output terminal of the switch device 31 is electrically connected to a second terminal of the touch line group 12, and an input terminal of each switch device 31 receives the detection voltage signal TPD. In the touch detection stage, the m switching devices 31 are turned on simultaneously, so that the detection voltage signal TPD is correspondingly transmitted to the m touch electrode blocks 11.
Taking one of the touch electrode blocks 11a and the power voltage block 13a corresponding thereto as an example, the switching device 31a is electrically connected to the touch line group 12a corresponding to the touch electrode block 11a, and a first end of the touch line group 12a is electrically connected to a first end of the power line group 14a corresponding to the power voltage block 13 a. In the touch detection stage, the switching device 31a is turned on, and the detection voltage signal TPD is transmitted to the touch electrode block 11a through the turned-on switching device 31a and the touch line group 12a electrically connected thereto, and simultaneously transmitted to the power electrode block 13a along the touch line group 12a and the power line group 14 a.
If the touch line group 12a is not abnormal, the detection voltage signal TPD is transmitted to the power voltage block 13a, the power voltage block 13a provides power voltage signals for each pixel point covered by the power voltage block, and the display area driven by the power voltage block is normally displayed; if the trace of the touch line set 12a is abnormal, the detection voltage signal TPD cannot be transmitted to the power voltage block 13a, and the power voltage block 13a cannot provide a power voltage signal for each pixel covered by the power voltage block, then the display area corresponding to the driving of the power voltage block displays the abnormality.
In the touch detection stage, the m switching devices 31 are turned on simultaneously, so that the detection voltage signal TPD is correspondingly transmitted to the m touch electrode blocks 11 and the power voltage block 13, and the detection principle of each touch line group 12 is the same. Theoretically, after the detection voltage signal is normally transmitted to the m power voltage blocks, the touch display device forms a frame of preset image. During touch detection, the touch display device displays a frame of picture, and if the actually displayed picture is consistent with a preset picture formed by driving by the detection voltage signal, the wiring of the m touch line groups is normal; if the actually displayed picture is incomplete or has obvious difference with a preset picture formed by driving by the detection voltage signal, the abnormal wiring of the touch line group of the touch electrode block corresponding to the display abnormal area is indicated. Therefore, the abnormal condition of the routing of the touch line group is judged according to whether the image displayed by the touch display device is abnormal or not.
In the touch detection stage, the detection voltage signal TPD can be selected as a fixed dc signal. As shown in fig. 3, after the detection voltage signal is normally transmitted to the m power voltage blocks, theoretically, the image displayed by the touch display device should be a frame of pure color image with uniform brightness, such as a white image or a black image. As shown in fig. 4, a frame of picture actually displayed by the touch display device is shown, where the display sub-areas 1a and 1b in the frame of picture are abnormal, and it can be determined that the trace abnormality exists in the touch line group electrically connected to the touch electrode block located in the abnormal display area, which results in the detection voltage signal not being transmitted to the power voltage block covered by the display sub-areas 1a and 1b, so that the actual display picture is different from the preset picture. Therefore, the detection of the wiring of the touch line set is realized through the display picture.
In the embodiment of the invention, the first end of the touch line group is electrically connected with the first end of the corresponding power line group through the via hole; the output end of the switch device is electrically connected with the second end of the corresponding touch line group, and the input end of the switch device receives a detection voltage signal TPD; and in the touch detection stage, the m switching devices are simultaneously conducted, so that the detection voltage signal TPD is correspondingly transmitted to the m touch electrode blocks and the m power supply voltage blocks. Therefore, whether the routing of the touch line group is abnormal can be judged according to whether the image displayed by the touch display device is abnormal. Carry out touch-control with current direct touch-control and walk line anomaly detection and compare, through rational utilization power voltage piece, combine together touch-control test mode and display drive, directly adopt the mode of picture display to carry out touch-control test, the efficiency of the precision and the interception that can effectual promotion detected like this promotes the productivity, reduces the missed measure rate, has realized touch-control detection and has shown the detection integration.
Exemplarily, on the basis of the above technical solution, the selectable touch detection stages include a first screen touch detection stage and a second screen touch detection stage; in a first picture touch detection stage, m switching devices are simultaneously conducted, so that a first detection voltage signal is correspondingly transmitted to m touch electrode blocks; in the second picture touch detection stage, the m switching devices are simultaneously conducted, so that a second detection voltage signal is correspondingly transmitted to the m touch electrode blocks; wherein the first detection voltage signal and the second detection voltage signal are different.
In this embodiment, in the first frame touch detection stage, m switching devices are turned on simultaneously, and the first detection voltage signal is correspondingly transmitted to m touch electrode blocks and a power supply voltage block; the touch display device displays a first picture, and if the actually displayed first picture is incomplete or has obvious difference with a preset first picture formed by driving of the detection voltage signal, the touch line group routing of the touch electrode block corresponding to the display abnormal area is abnormal. In the second picture touch detection stage, the m switching devices are simultaneously conducted, and a second detection voltage signal is correspondingly transmitted to the m touch electrode blocks and the power supply voltage block; and the touch display device displays a second picture, and if the actually displayed second picture is incomplete or has obvious difference with a preset second picture formed by driving of the detection voltage signal, the abnormal wiring of the touch line group of the touch electrode block corresponding to the display abnormal area is indicated.
The first picture can be selected and preset as a white picture, and the second picture can be preset as a black picture. The touch display device is driven to display two different frames of pictures to carry out touch line set abnormity detection, so that the detection accuracy can be further improved, missing detection is avoided, and small defects can be detected by comparing the two frames of pictures.
For example, based on the above technical solution, as shown in fig. 5, the selectable test switch module 3 includes a first test switch group 3a and a second test switch group 3b, where the first test switch group 3a includes m1 first switches 311, the second test switch group 3b includes m2 second switches 312, output terminals of m1 first switches 311 are electrically connected to second terminals of m1 touch line groups 12, respectively, input terminals of m1 first switches 311 receive the first voltage signal TPD1, output terminals of m2 second switches 312 are electrically connected to second terminals of the remaining m2 touch line groups 12, respectively, input terminals of m2 second switches 312 receive the second voltage signal TPD2, and m1+ m2 ═ m; in the first screen touch detection stage, the m1 first switches 311 and the m2 second switches 312 are simultaneously turned on, so that the first voltage signal TPD1 and the second voltage signal TPD2 are correspondingly transmitted to the m touch electrode blocks 11; in the second screen touch detection stage, the m1 first switches 311 and the m2 second switches 312 are simultaneously turned on, so that the first voltage signal TPD1 and the second voltage signal TPD2 are correspondingly transmitted to the m touch electrode blocks 11; the first voltage signal TPD1 and the second voltage signal TPD2 are different in the same picture, and the first voltage signal TPD1 and the second voltage signal TPD2 are different in different pictures.
In this embodiment, the first test switch group 3a includes m1 identical first switches 311, and when the first switches 311 are turned on, the touch line group 12 electrically connected to the first switches 311 should transmit the first voltage signal TPD1 to the touch electrode block 11 and the power voltage block 13. If the trace of the touch line group 12 electrically connected to the first switch 311 is normal, the first voltage signal TPD1 is transmitted to the power voltage block 13 correspondingly connected to the touch line group 12, and the display area driven by the power voltage block 13 correspondingly displays normal. If the trace of the touch line group 12 electrically connected to the first switch 311 has an abnormal condition such as an open circuit, the first voltage signal TPD1 will not be transmitted to the power voltage block 13 correspondingly connected to the touch line group 12, which may cause an abnormal display of the display partition driven by the power voltage block 13, such as a black screen, or a display partition with a brightness different from that of the display partition driven by the other power voltage block 13 normally receiving the first voltage signal TPD 1.
The second test switch group 3b includes m2 identical second switches 312, when the second switches 312 are turned on, and the trace of the touch line group 12 electrically connected to the second switches 312 is normal, the second voltage signal TPD2 may be transmitted to the power voltage block 13 correspondingly connected to the touch line group 12, and the display partition driven by the power voltage block 13 correspondingly displays normally. If the trace of the touch line group 12 electrically connected to the second switch 312 has an abnormal condition such as an open circuit, the second voltage signal TPD2 cannot be transmitted to the power voltage block 13 correspondingly connected to the touch line group 12, so that the display of the display partition corresponding to the power voltage block 13 is abnormal, such as a black screen, or the brightness is obviously different from that of the display partition corresponding to the other power voltage block 13 normally receiving the TPD 2.
In the first screen touch detection stage, the m1 first switches 311 and the m2 second switches 312 are simultaneously turned on, so that the first voltage signal TPD1 and the second voltage signal TPD2 are correspondingly transmitted to the m touch electrode blocks 11. The touch display device displays a first picture, pictures displayed by display partitions corresponding to power supply voltage blocks with the same voltage signal transmission in the first picture are theoretically consistent, and pictures displayed by the display partitions corresponding to the power supply voltage blocks with different voltage signal transmissions are different, so that whether touch wiring is abnormal or not can be judged according to the display conditions of the pictures of the different display partitions in the first picture.
In the second screen touch detection stage, the m1 first switches 311 and the m2 second switches 312 are simultaneously turned on, so that the first voltage signal TPD1 and the second voltage signal TPD2 are correspondingly transmitted to the m touch electrode blocks 11; the first voltage signal TPD1 and the second voltage signal TPD2 are different in the same picture, and the first voltage signal TPD1 and the second voltage signal TPD2 are different in different pictures. The touch display device displays a second picture, and whether the touch routing is abnormal can be judged according to the display conditions of different display partition pictures in the second picture.
The abnormal detection of the touch wiring is realized by adopting the picture partition display, and the wiring condition of the touch wiring group is judged by combining the display conditions of the first picture and the second picture, so that the detection accuracy can be further improved.
Exemplarily, on the basis of the above technical solution, each touch line group corresponding to a row of touch electrode blocks can be selected to be electrically connected to the switches of the same switch group; or each touch line group corresponding to one row of touch electrode blocks is electrically connected with the switch of the same switch group.
Each touch line group corresponding to the touch electrode blocks in the odd-numbered rows is electrically connected with a switch of the first test switch group, and each touch line group corresponding to the touch electrode blocks in the even-numbered rows is electrically connected with a switch of the second test switch group; or each touch line group corresponding to the odd-numbered rows of touch electrode blocks is electrically connected with the switch of the first test switch group, and each touch line group corresponding to the even-numbered rows of touch electrode blocks is electrically connected with the switch of the second test switch group.
As shown in fig. 5, each touch line group 12 corresponding to a row of touch electrode blocks 11 is electrically connected to the switches of the same switch group. Each touch line group 12 corresponding to the optional odd-numbered row of touch electrode blocks 11 is electrically connected to the switch 311 of the first test switch group 3a, and each touch line group 12 corresponding to the even-numbered row of touch electrode blocks 11 is electrically connected to the switch 312 of the second test switch group 3 b.
As shown in fig. 6, in the first frame touch detection stage, when the routing is normal, the display area corresponding to the odd-numbered touch electrode blocks 11 displays a first sub-frame, the display area corresponding to the even-numbered touch electrode blocks 11 displays a second sub-frame, and the first sub-frame is selected as a white frame and the second sub-frame is selected as a black frame. If the display area 1a corresponding to the touch electrode block 11 shows an abnormality, it is determined that the touch line group 12 of the touch electrode block 11 covered by the display area has an abnormal routing.
As shown in fig. 7, in the second frame touch detection stage, when the selected trace is normal, the display area corresponding to the odd-numbered touch electrode block 11 displays a second sub-frame, the display area corresponding to the even-numbered touch electrode block 11 displays a first sub-frame, and the first sub-frame is selected as a white frame and the second sub-frame is selected as a black frame. If the display area 1b corresponding to the touch electrode block 11 displays an abnormal condition, it is determined that the touch line group 12 of the touch electrode block 11 covered by the display area has an abnormal trace.
In other embodiments, each touch line group corresponding to one row of touch electrode blocks may be electrically connected to the switch of the same switch group, and the touch line groups corresponding to two adjacent rows of touch electrode blocks are electrically connected to the switches of different switch groups.
As shown in fig. 8, two touch line groups 12 corresponding to any two adjacent touch electrode blocks 11 can be selected to be electrically connected to switches of different test switch groups. Fig. 9 is a comparison of the normal frame and the abnormal frame in the first frame touch detection stage shown in fig. 8, and fig. 10 is a comparison of the normal frame and the abnormal frame in the second frame touch detection stage shown in fig. 8. Two touch line groups 12 corresponding to any two adjacent touch electrode blocks 11 are electrically connected with switches of different test switch groups, so that the first picture and the second picture are both chessboard-format display pictures under the condition of normal wiring, and the pictures of the first picture and the second picture can be selected to be turned over. And judging whether the m touch line groups have abnormal wiring or not according to the display conditions of the first picture and the second picture.
As shown in fig. 8, the selectable non-display area further includes a first touch timing line CKH1 and a second touch timing line CKH2, the first touch timing line CKH1 is electrically connected to the control terminal of each first switch 311, and the second touch timing line CKH2 is electrically connected to the control terminal of each second switch 312; the first switch is a PMOS transistor or an NMOS transistor, and the second switch is a PMOS transistor or an NMOS transistor.
The first touch timing line CKH1 independently controls m1 first switches 311 in the first testing switch group 3a to be turned on or off simultaneously, so the type of the first switches is not limited, and the first switches may be selected to be PMOS transistors or NMOS transistors. Similarly, the second touch timing line CKH2 independently controls the m2 second switches 312 in the second testing switch group 3b to be turned on or off simultaneously, so the type of the second switches is not limited, and the second switches may be PMOS transistors or NMOS transistors. As shown in fig. 8, the first switch 311 and the second switch 312 are both NMOS transistors. In other embodiments, other combinations are also possible, and not limited to this, for example, the first switch is a PMOS transistor and the second switch is an NMOS transistor.
As shown in fig. 1, the optional non-display area 2 further includes a touch timing line CKH, the touch timing line CKH is electrically connected to the control terminal of each of the switch devices 31, and the switch devices 31 are all PMOS transistors or all NMOS transistors. The touch timing line CKH controls each switching device to be turned on or turned off simultaneously, and it is necessary to ensure that the switching devices are of the same type, and the selectable switching devices are all PMOS transistors or all NMOS transistors. The optional switching devices shown in fig. 1 are all NMOS transistors. In other embodiments, the switching devices are all PMOS transistors.
The optional power supply voltage block 13 is in a metal mesh structure as shown in fig. 11. The power supply voltage block 13 is electrically connected to the plurality of pixel circuits of the corresponding display region, and is configured to provide a power supply signal PVDD to each pixel circuit in the display phase, where the power supply signal PVDD is applied to the anode of the corresponding sub-pixel through the pixel circuit as an input voltage provided to the pixel circuit, so as to control the sub-pixel to emit light for display. It can be understood that the m power voltage blocks 13 of the power voltage layer provide input voltages to all the sub-pixels of the display area, the light emitting current of the sub-pixels is related to PVDD, the larger the PVDD is, the larger the light emitting current of the sub-pixels is, the higher the light emitting luminance of the sub-pixels is, and the smaller the PVDD is, the smaller the light emitting current of the sub-pixels is, and the lower the light emitting luminance of the sub-pixels is. The relevant practitioner can reasonably set and control the size of the PVDD according to the requirement of the product.
In the prior art, the power voltage layer is a monolithic power voltage block that provides input voltages to all sub-pixels of the display area. In this embodiment, a whole power supply voltage block is divided into a plurality of independent power supply voltage blocks, so as to facilitate detection of abnormal routing of the touch line set. In addition, in other embodiments, the independent abnormal routing detection may be performed on each touch line group by selecting a needle, or the independent abnormal routing detection may be performed on a touch line group for which the abnormal routing is preliminarily determined, that is, only one touch line group is provided with a detection voltage signal, and whether the routing of the touch line group is abnormal is determined according to a picture of a display area corresponding to a power supply voltage block electrically connected to the touch line group. Through the dual detection mode of whole detection and independent detection, improve and detect the accuracy, avoid erroneous judgement.
Referring to fig. 2 and 11, the outer edge of the orthogonal projection of the optional power supply voltage block 13 on the touch electrode layer overlaps the outer edge of the touch electrode block 11. Each touch electrode block 11 may correspond to one display area, and the abnormal condition of the routing of the touch lines is detected by using pictures of different display areas, so that a scheme of performing touch detection on the display pictures is realized.
As shown in fig. 12, the non-display area 2 includes a display switch group 4 located at a second end of the touch line group, the display switch group 4 includes m display switches 41, a second end of one power line group 14 is disposed corresponding to and electrically connected to an output end of one display switch 41, and an input end of the display switch 41 receives a display voltage signal PVDD; in the display detection stage, the m display switches 41 of the display switch group 4 are simultaneously turned on, and the m switch devices of the test switch module are simultaneously turned off, so that the display voltage signal PVDD is transmitted to each power supply voltage block 13; and in the touch detection stage, the switches of the display switch group 4 are turned off at the same time.
In this embodiment, the display detection phase is a VT lighting test phase of the panel. When the test switch module is in a normal VT lighting test stage, m switch devices of the test switch module are turned off at the same time, the m touch electrode blocks are independent from each other, and simultaneously, m display switches are turned on synchronously, a display voltage signal PVDD can be transmitted to the m power voltage blocks 13 through the m power line groups 14 respectively, the m power voltage blocks 13 are in short circuit with each other, and a picture is displayed normally. The VT lighting test can be used for detecting the defects of a display picture, and can also be used for detecting whether the wiring of the power line group is abnormal or not so as to facilitate subsequent accurate touch detection.
In the touch detection stage, the switches of the display switch group 4 are all turned off, so that the power voltage blocks 13 are independent from each other, and meanwhile, m switch devices of the test switch module are simultaneously turned on, and a detection voltage signal can be transmitted to the power voltage blocks to display a picture. And judging whether the wiring of the touch line group is abnormal or not according to the condition of the display picture.
The method for detecting the abnormal wiring of the touch line set by adopting a display picture mode has the advantages of simple detection process and excellent detection efficiency and accuracy.
The selectable detection voltage signal is a supply voltage signal. The touch display device is provided with a power voltage signal source line for providing a power signal (namely a display voltage signal PVDD) for a power voltage layer in advance, the power voltage signal source line is multiplexed into a detection voltage signal line, the detection voltage signal is provided for the touch electrode block, the detection voltage signal source line does not need to be additionally increased, and the area of a frame is not increased.
Based on the same inventive concept, an embodiment of the present invention provides a method for testing a touch display device, where the touch display device is the touch display device described in any of the above embodiments, and as shown in fig. 13, the method includes:
s1, controlling m switching elements to be conducted simultaneously in a touch detection stage, and enabling detection voltage signals to be correspondingly transmitted to m touch electrode blocks;
s2, judging whether the touch line group is abnormal according to the display picture of the touch display device.
The selectable non-display area comprises a display switch group positioned at the second end of the touch line group, the display switch group comprises m display switches, the second end of one power line group is correspondingly arranged and electrically connected with the output end of one display switch, and the input end of the display switch receives a display voltage signal; as shown in fig. 14, the test method further includes: s0, displaying a detection stage; and in the display detection stage, m switch devices of the test switch module are controlled to be turned off simultaneously, m display switches are controlled to be turned on simultaneously, and display voltage signals are transmitted to each power supply voltage block.
In this embodiment, through rational utilization power supply voltage piece, combine together touch-control test mode and display drive, directly adopt the mode of picture display to carry out the touch-control test, can effectually promote the precision that detects like this and the efficiency of interception, promote the productivity, realized that touch-control detects and show the detection integration.
Optionally, firstly, a display test is carried out, m switch devices of the test switch module are turned off at the same time, m display switches are controlled to be turned on at the same time, m touch electrode blocks are mutually independent, the display voltage signal PVDD is transmitted to each power voltage block, and the touch display device displays a picture. Through the display condition of the display picture, whether the connection between the power voltage block and the sub-pixel is abnormal can be judged, and the abnormal detection of the routing of the power line can be carried out. For example, if the connection between the power voltage block and the sub-pixel is abnormal, a black dot or an abnormal display dot may exist in the display screen; and if the wiring of the power line group has abnormity such as wire breakage, the display subarea which is driven and displayed by the power line group in the display picture is not displayed or is a black area.
And secondly, performing touch test, wherein m switch devices of the test switch module are simultaneously switched on, m display switches are controlled to be simultaneously switched off, m power supply voltage blocks are mutually independent, the detection voltage signal is transmitted to each power supply voltage block, and the touch display device displays a picture. The abnormal detection of the wiring of the touch line set can be judged through the display condition of the display picture. For example, if there is an abnormality such as a broken line in the routing of the touch line group, the display area of the display screen driven by the power line group electrically connected to the abnormal touch line group is not displayed or is a black area.
After the optional detection is completed, the method further comprises the following steps: and disconnecting the first end of the touch line group from the first end of the corresponding power line group. After the display detection and the touch control test are finished, the touch control display device has no display abnormality and also has no touch control abnormality, and the connection part of the power supply line group and the touch control line group is controlled to be cut off, so that the power supply voltage block and the touch control electrode block are mutually independent. In subsequent normal use, the touch display device can perform normal touch and normal display.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (15)
1. A touch display device, comprising: a display area and a non-display area;
the display area comprises a touch electrode layer and a power voltage layer which are stacked and insulated, the touch electrode layer comprises m touch electrode blocks and m touch line groups which are arranged in an array, one touch electrode block is electrically connected with one touch line group, the power voltage layer comprises m power voltage blocks and m power line groups which are arranged in an array, one power voltage block is electrically connected with one power line group, the m touch electrode blocks and the m power voltage blocks are respectively arranged correspondingly, and the first ends of the touch line groups are electrically connected with the first ends of the corresponding power line groups through via holes;
the non-display area comprises a test switch module positioned at the second end of the touch line group, the test switch module comprises m switch devices, the output ends of the m switch devices are respectively and correspondingly electrically connected with the second ends of the m touch line groups, and the input ends of the m switch devices receive detection voltage signals;
and in the touch detection stage, the m switching devices are simultaneously conducted, so that the detection voltage signals are correspondingly transmitted to the m touch electrode blocks.
2. The touch display device of claim 1, wherein the touch detection stage comprises a first frame touch detection stage and a second frame touch detection stage;
in the first picture touch detection stage, the m switching devices are simultaneously switched on, so that a first detection voltage signal is correspondingly transmitted to the m touch electrode blocks;
in the second picture touch detection stage, the m switching devices are simultaneously turned on, so that a second detection voltage signal is correspondingly transmitted to the m touch electrode blocks;
wherein the first detection voltage signal and the second detection voltage signal are different.
3. The touch display device of claim 1, wherein the test switch module includes a first test switch group and a second test switch group, the first test switch group includes m1 first switches, the second test switch group includes m2 second switches, outputs of the m1 first switches are electrically connected to second ends of the m1 touch line groups, respectively, inputs of the m1 first switches receive first voltage signals, outputs of the m2 second switches are electrically connected to second ends of the remaining m2 touch line groups, respectively, inputs of the m2 second switches receive second voltage signals, and m1+ m2 is m;
in a first frame touch detection stage, the m1 first switches and the m2 second switches are simultaneously turned on, so that the first voltage signals and the second voltage signals are correspondingly transmitted to the m touch electrode blocks;
in a second frame touch detection stage, the m1 first switches and the m2 second switches are simultaneously turned on, so that the first voltage signals and the second voltage signals are correspondingly transmitted to the m touch electrode blocks;
the first voltage signal and the second voltage signal are different in the same picture, and the first voltage signal and the second voltage signal are different in different pictures.
4. The touch display device according to claim 3, wherein each touch line group corresponding to a row of the touch electrode blocks is electrically connected to a switch of the same switch group; or,
and each touch line group corresponding to one row of touch electrode blocks is electrically connected with the switch of the same switch group.
5. The touch display device according to claim 3, wherein each of the touch line groups corresponding to the odd-numbered rows of the touch electrode blocks is electrically connected to the switches of the first test switch group, and each of the touch line groups corresponding to the even-numbered rows of the touch electrode blocks is electrically connected to the switches of the second test switch group; or,
each touch line group corresponding to the odd-numbered rows of the touch electrode blocks is electrically connected with the switch of the first test switch group, and each touch line group corresponding to the even-numbered rows of the touch electrode blocks is electrically connected with the switch of the second test switch group.
6. The touch display device of claim 3, wherein two touch line groups corresponding to any two adjacent touch electrode blocks are electrically connected to switches of different test switch groups.
7. The touch display device according to claim 3, wherein the non-display area further comprises a first touch timing line and a second touch timing line, the first touch timing line is electrically connected to the control terminal of each of the first switches, and the second touch timing line is electrically connected to the control terminal of each of the second switches;
the first switch is a PMOS transistor or an NMOS transistor, and the second switch is a PMOS transistor or an NMOS transistor.
8. The touch display device according to claim 1, wherein the non-display area further includes a touch timing line, the touch timing line is electrically connected to a control terminal of each of the switching devices, and the switching devices are either PMOS transistors or NMOS transistors.
9. The touch display device of claim 1, wherein the power supply voltage block is of a metal mesh structure.
10. The touch display device according to claim 1, wherein an outer edge of an orthographic projection of the power supply voltage block on the touch electrode layer overlaps an outer edge of the touch electrode block.
11. The touch display device according to claim 1, wherein the non-display area includes a display switch group at a second end of the touch line group, the display switch group includes m display switches, the second end of one of the power line groups is disposed corresponding to and electrically connected to an output terminal of one of the display switches, and an input terminal of the display switch receives a display voltage signal;
in the display detection stage, m display switches of the display switch group are simultaneously turned on, and m switch devices of the test switch module are simultaneously turned off, so that the display voltage signal is transmitted to each power supply voltage block;
and in the touch detection stage, the switches of the display switch group are simultaneously turned off.
12. The touch display device of claim 1, wherein the detection voltage signal is a power voltage signal.
13. A method for testing a touch display device according to any one of claims 1-12, comprising:
in the touch detection stage, the m switching devices are controlled to be simultaneously conducted, so that the detection voltage signals are correspondingly transmitted to the m touch electrode blocks;
and judging whether the touch line group is abnormal or not according to a display picture of the touch display device.
14. The method according to claim 13, wherein the non-display area includes a display switch group at a second end of the touch line group, the display switch group includes m display switches, the second end of one of the power line groups is disposed corresponding to and electrically connected to an output terminal of one of the display switches, and an input terminal of the display switch receives a display voltage signal;
the test method further comprises the following steps: displaying the detection stage;
and in the display detection stage, m switch devices of the test switch module are controlled to be turned off at the same time, m display switches are controlled to be turned on at the same time, and the display voltage signals are transmitted to each power supply voltage block.
15. The method of claim 13, further comprising, after the detecting is completed: and disconnecting the first end of the touch line group from the first end of the corresponding power line group.
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