TWI647682B - Detection method and display panel - Google Patents

Abstract

A detection method for detecting a display panel. The detection method includes the following steps: turning on the first switch to turn on at least one of the first sensing electrodes; measuring the first impedance value through the first test pad and the second test pad; turning on the second switch to turn on the second sensing At least one of the electrodes; measuring the second impedance value through the third test pad and the fourth test pad; judging at least one of the first sensing electrode and the second sensing according to the first impedance value and the second impedance value Whether at least one of the electrodes is in an open circuit state; measuring a third impedance value through the second test pad and the third test pad; and judging at least one of the first sensing electrode and the second sense electrode according to the third impedance value It is measured whether at least one of the electrodes is in a short-circuit state.

Description

Detection method and display panel

This case relates to a detection method and a display panel, and more particularly to a detection method and a display panel for detecting a sensing electrode.

With the rapid development and application of information technology, wireless mobile communications, and information appliances, in order to achieve the purposes of portability, lightness, and user-friendliness, many information products have been transformed from traditional keyboard or mouse input devices to use The touch panel is used as an input device.

At present, touch panels can be roughly divided into touch panels such as resistive, capacitive, infrared, and ultrasonic. Among them, resistive touch panels and capacitive touch panels are the most common products. As far as capacitive touch panels are concerned, the characteristics of multi-touch provide a more user-friendly operation mode and make capacitive touch panels popular in the market.

Generally speaking, a touch display panel has an active area and a peripheral area. The active area is provided with a plurality of sensing electrodes to sense the occurrence of a touch event, and the peripheral area is provided with a plurality of connected to the sensing electrodes Signal transmission line. If it is in the production process of the touch display panel, it is first checked whether there is a short circuit or an open circuit between the plurality of sensing electrodes, which can reduce the touch display panel. Production costs.

Therefore, how to check whether there is a short circuit or an open circuit between the plurality of sensing electrodes in the production process of the touch display panel is one of the problems to be improved in this field.

One aspect of this case is to provide a detection method. This detection method is used to detect the display panel. The display panel includes a plurality of first sensing electrodes, a plurality of second sensing electrodes, a first test pad, a second test pad, a third test pad, a fourth test pad, a plurality of first switches, and a plurality of second switches. . The first sensing electrodes and the second sensing electrodes are staggered. The first sensing electrode is electrically connected to the first test pad and the second test pad through a first switch, respectively. The second sensing electrode is electrically connected to the third test pad and the fourth test pad through the second switch, respectively. The detection method includes the following steps: turning on the first switch to turn on at least one of the first sensing electrodes; measuring the first impedance value through the first test pad and the second test pad; turning on the second switch to turn on the second sensing At least one of the electrodes; measuring the second impedance value through the third test pad and the fourth test pad; judging at least one of the first sensing electrode and the second sensing according to the first impedance value and the second impedance value Whether at least one of the electrodes is in an open circuit state; measuring a third impedance value through the second test pad and the third test pad; and judging at least one of the first sensing electrode and the second sense electrode according to the third impedance value It is measured whether at least one of the electrodes is in a short-circuit state.

Another aspect of the present case is to provide a display panel. The display panel includes a substrate, a plurality of first sensing electrodes, a plurality of second sensing electrodes, First and second test pads, third and fourth test pads, multiple wafer bumps, multiple first transmission traces, multiple second transmission traces, multiple first peripheral traces, Multiple second peripheral traces, multiple first connection traces, and multiple second connection traces. The substrate has an active area and a peripheral area, wherein the peripheral area is adjacent to the active area. The plurality of first sensing electrodes are disposed in the active area. The plurality of second sensing electrodes are disposed in the active area, and the plurality of first sensing electrodes and the plurality of second sensing electrodes are alternately arranged with each other. The first test pad and the second test pad are respectively disposed in a peripheral area, and the first test pad and the second test pad are electrically connected to a plurality of first sensing electrodes, respectively. The third test pad and the fourth test pad are respectively disposed in the peripheral area, and the third test pad and the fourth test pad are electrically connected to a plurality of second sensing electrodes, respectively. The plurality of wafer bumps each include a first connection pad and a second connection pad, and each of the plurality of first connection pads is electrically connected to one of the plurality of first sensing electrodes, and each of the plurality of second connection pads is electrically connected. One of the plurality of second sensing electrodes is connected. The plurality of first transmission lines are respectively coupled to one of the plurality of first sensing electrodes and one of the plurality of first connection pads. The plurality of second transmission lines are respectively coupled to one of the plurality of second sensing electrodes and one of the plurality of second connection pads. The plurality of first peripheral traces are respectively coupled between one of the plurality of first connection pads and the first test pad, and between one of the plurality of first connection pads and the second test pad. The plurality of second peripheral traces are respectively coupled between one of the plurality of second connection pads and the third test pad, and between one of the plurality of second connection pads and the fourth test pad. The plurality of first connection traces are respectively coupled between the plurality of first connection pads and between the plurality of first sensing electrodes. The plurality of second connection traces are respectively coupled between the plurality of second connection pads and between the plurality of second sensing electrodes.

Therefore, according to the technical aspect of the present case, the embodiments of the present case provide a detection method and a display panel to check whether there is a short circuit or an open circuit between the plurality of sensing electrodes during the production process of the display panel.

100, 200A, 200B, 300‧‧‧ display panels

110‧‧‧ substrate

112‧‧‧Active Zone

114‧‧‧Peripheral area

120A-120H‧‧‧Sensor

125A-125H‧‧‧sensing electrode

130, 135‧‧‧Connecting pads

140, 145‧‧‧ transmission line

150A, 150B, 155A, 155B‧‧‧

160A, 160B, 165A, 165B

170A, 170B, 170C, 170D‧‧‧ Switches

175A, 175B, 175C, 175D‧‧‧ Switches

190, 192, 194, 196‧‧‧ test pads

310A, 310B, 310C, 310D

400‧‧‧Test method

S410, S420, S430, S440‧‧‧ steps

S450, S460, S470, S452, S454 ‧‧‧ steps

In order to make the above and other objects, features, advantages, and embodiments of the present invention more comprehensible, the description of the drawings is as follows: FIG. 1 is a schematic diagram of a display panel according to some embodiments of the present invention; FIG. 2A is a schematic diagram of a display panel according to some embodiments of the present case; FIG. 2B is a schematic diagram of a display panel according to some embodiments of the present case; FIG. 3 is a diagram of some embodiments according to the present case FIG. 4 is a schematic diagram of a display panel; FIG. 4 is a flowchart of a detection method according to some embodiments of the present invention; and FIG. 5 is a 4th diagram of a detection method according to some embodiments of the present invention. A flowchart of one of the steps in.

The following disclosure provides many different embodiments or illustrations to implement different features of the invention. The elements and configurations in the particular example are used in the following discussion to simplify the present disclosure. Any examples discussed are for illustrative purposes only. It is not intended to limit the scope and meaning of the invention or its illustrations in any way. In addition, the present disclosure may repeatedly refer to numerical symbols and / or letters in different examples, and these repetitions are for simplification and explanation, and do not themselves specify the relationship between different embodiments and / or configurations in the following discussion.

The terms used throughout the specification and the scope of patent applications, unless otherwise specified, usually have the ordinary meaning of each term used in this field, in the content disclosed here, and in special content. Certain terms used to describe this disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art on the description of this disclosure.

As used herein, "coupling" or "connection" can mean that two or more components make direct physical or electrical contact with each other, or indirectly make physical or electrical contact with each other, and "coupling" or " "Connected" may also mean that two or more elements operate or act on each other.

In this article, the terms first, second, third, etc. are used to describe various elements, components, regions, layers, and / or blocks that are understandable. However, these elements, components, regions, layers and / or blocks should not be limited by these terms. These terms are limited to identifying single elements, components, regions, layers, and / or blocks. Therefore, a first element, component, region, layer, and / or block in the following may also be referred to as a second element, component, region, layer, and / or block without departing from the intention of the present invention. As used herein, the term "and / or" includes any combination of one or more of the associated listed items. The "and / or" mentioned in this document refers to any, all or any combination of at least one of the listed elements.

See Figure 1. Figure 1 shows some embodiments according to the present case. A schematic diagram of a display panel 100 is shown. As shown in FIG. 1, the display panel 100 includes a substrate 110. The substrate 110 includes an active region 112 and a peripheral region 114. The peripheral region 114 is adjacent to the active region 112. In this embodiment, the peripheral region 114 is located on two opposite sides of the active region 112, but the present invention is not limited thereto. The plurality of first sensing electrodes 120A-120H and the plurality of second sensing electrodes 125A-125H are disposed in the active area 112, and the plurality of first sensing electrodes 120A-120H and the plurality of second sensing electrodes 125A-125H are each other Staggered configuration. The first test pad 190, the second test pad 192, the third test pad 194, and the fourth test pad 196 are respectively disposed in the peripheral region 114. In the embodiment of FIG. 1, the first test pad 190 and the second test pad 192 are electrically connected to the plurality of first sensing electrodes 120A-120H, respectively, and the third test pad 194 and the fourth test pad 196 are respectively electrically connected. It is sexually connected to a plurality of second sensing electrodes 125A-125H.

In this embodiment, the display panel 100 includes a plurality of first connection pads 130 and a plurality of second connection pads 135, wherein the plurality of first connection pads 130 and the plurality of second connection pads 135 are disposed in the peripheral region 114. In some embodiments, the plurality of first connection pads 130 and the plurality of second connection pads 135 may be regarded as IC bumps for electrically connecting the ICs. For example, the wafer can be fixed to the wafer bump by solder, and the solder can also be used as a medium for electrical connection. The plurality of first connection pads 130 are electrically connected to one of the plurality of first sensing electrodes 120A-120H, and the plurality of second connection pads 135 are electrically connected to one of the plurality of second sensing electrodes 125A-125H. By. In this embodiment, the display panel 100 includes a plurality of first transmission lines 140 and a plurality of second transmission lines 145. The plurality of first transmission lines 140 are respectively coupled to one of the plurality of first sensing electrodes 120A-120H and one of the plurality of first connection pads 130, and The plurality of second transmission lines 145 are respectively coupled to one of the plurality of second sensing electrodes 125A-125H and one of the plurality of second connection pads 135. In other words, the plurality of first transmission lines 140 and the plurality of second transmission lines 145 respectively extend from the peripheral area 114 to the active area 112 to serve as electrical transmission between each connection pad and its corresponding sensing electrode.

In some embodiments, the display panel 100 includes a plurality of first peripheral traces 160A, 160B and a plurality of second peripheral traces 165A, 165B, wherein the plurality of first peripheral traces 160A, 160B and a plurality of second peripheral traces The lines 165A, 165B are located in the peripheral area 114. The plurality of first peripheral traces 160A and 160B are respectively coupled between one of the plurality of first connection pads 130 and the first test pad 190 and one of the plurality of first connection pads 130 and the second test pad. Between 192. For example, the first peripheral trace 160A is coupled between one of the plurality of first connection pads 130 and the first test pad 190, and the first peripheral trace 160B is coupled to the plurality of first connection pads 130. One of them is between the second test pad 192. In the embodiment of FIG. 1, a plurality of second peripheral traces 165A and 165B are respectively coupled between one of the plurality of second connection pads 135 and the third test pad 194 and the plurality of second connection pads 135. Between one of them and the fourth test pad 196. For example, the second peripheral trace 165A is coupled between one of the plurality of second connection pads 135 and the third test pad 194, and the second peripheral trace 165B is coupled to the plurality of second connection pads 135. Between one of them and the fourth test pad 196. In other words, the first peripheral trace 160A serves as the electrical transfer between the first connection pad and the first test pad 190, and the first peripheral trace 160B serves as the electrical connection between the first connection pad and the second test pad 192. Sexuality. Similarly, the second peripheral trace 165A is used as the second connection pad and the third The electrical transmission between the test pads 194 and the second peripheral trace 165B serves as the electrical transmission between the second connection pad and the fourth test pad 196.

In some embodiments, the display panel 100 includes a plurality of first connection tracks 150A and 150B and a plurality of second connection tracks 155A and 155B. The plurality of first connection tracks 150A and 150B are respectively coupled between the plurality of first connection pads 130 and between the plurality of first sensing electrodes 120A-120H. For example, the first connection trace 150B is coupled between two of the plurality of first connection pads 130, and the first connection trace 150A is coupled between two of the plurality of first sensing electrodes 120A-120H. between. In other words, the plurality of first connection tracks may be located in the peripheral area 114 and the active area 112, respectively. Taking the plurality of first connection traces 150A as electrical transmissions between the pair of first sensing electrodes 120A-120H, they can be disposed in the active region 112 or extended from the peripheral region 114 to the active region 112. Taking the plurality of first connection traces 150B as an example, the first connection traces 150B can be used as electrical transmission between the pair of first connection pads 130 and disposed in the peripheral region 114. In this embodiment, a plurality of second connection traces 155A, 155B are respectively coupled between the plurality of second connection pads 135 and between the plurality of second sensing electrodes 125A-125H. For example, the second connection trace 155B is coupled between the two second connection pads 135, and the second connection trace 155A is coupled between the two second sensing electrodes 125A-125H. . Specifically, the plurality of second connection traces may be located in the peripheral area 114 and the active area 112, respectively. Taking the plurality of second connection traces 155A as electrical transmission between the pair of second sensing electrodes 125A-125H, the second connection traces 155A may be disposed in the active region 112 or extended from the peripheral region 114 to the active region 112. For multiple second connection traces 150B, they can be used as two pairs The second connection pads 135 are electrically transferred and are disposed in the peripheral region 114. For the convenience of description, only eight first sensing electrodes 120 and eight second sensing electrodes 125 are shown in the first figure. However, this case is not limited thereto. In some embodiments, the peripheral region 114 may include a chip (not shown), and the chip may be disposed corresponding to the first connection pad 130 and the second connection pad 135 to allow the chip and the first sensing electrode 120A to pass through the connection pad. -120H and the second sensing electrodes 125A-125H can be electrically transferred to each other.

In some embodiments, the display panel 100 further includes a plurality of first switches 170A, 170B, 170C, and 170D and a plurality of second switches 175A, 175B, 175C, and 175D. The plurality of first switches 170A, 170B, 170C, and 170D and the plurality of second switches 175A, 175B, 175C, and 175D are respectively disposed in the peripheral region 114. The plurality of first switches 170A, 170B, 170C, and 170D are respectively coupled to one of the plurality of first connection pads 130 and the first test pad 190 through the first peripheral wirings 160A and 160B. One of the plurality of first sensing electrodes 120A- between one of the pads 130 and the second test pad 192 and coupled between two of the plurality of first connection pads 130 through the first connection traces 150A and 150B. 1210H in between. Specifically, the first switch 170A is coupled between one of the plurality of first connection pads 130 and the first test pad 190 to control whether the first connection pad 130 and the first test pad 190 are electrically connected. . The first switch 170B is coupled between one of the first connection pads 130 and the second test pad 192 to control whether the first connection pad 130 and the second test pad 192 are electrically connected. Similarly, the first switch 170C is coupled between two of the plurality of first connection pads 130 through the first connection wires 150A and 150B to control the pair of first connection pads 130. Whether it is electrically connected. The first switch 170D is coupled between the plurality of first sensing electrodes 120A-120H through the first connection wires 150A and 150B to control whether the two first sensing electrodes 120 are electrically connected. . In this embodiment, the first switches 170A, 170B, 170C, and 170D are located in the peripheral area 114. The first switch 170 is located on one side of the active area 112, and the other first switches 170A, 170B, and 170C are located in the active area. The other side of the region 112 is such that the first switches 170A, 170B, 170C, the first test pad 190, the second test pad 192, the third test pad 194, and the fourth test pad 196 are disposed on the same side. However, the present invention is not limited to this. In other embodiments, the position of the first switch can be adjusted according to different wiring designs, test pads, and layout of the peripheral area, and the first sensing electrode and the first connection pad can be controlled. The electrical conduction relationship between the first test pad and the second test pad is sufficient.

In some embodiments, the plurality of second switches 175A, 175B, 175C, and 175D are respectively coupled between one of the plurality of second connection pads 135 and the third test pad 194 through the second peripheral wiring 165A, 165B. Between one of the plurality of second connection pads 135 and the fourth test pad 196, and between two of the plurality of second connection pads 135 through the second connection traces 155A, 155B, a plurality of first Between the two sensing electrodes 125. Specifically, the second switch 175A is coupled between one of the plurality of second connection pads 135 and the third test pad 194 to control whether the second connection pad 135 and the third test pad 194 are electrically connected. . The second switch 175B is coupled between one of the plurality of second connection pads 135 and the fourth test pad 196 to control whether the second connection pad 135 and the fourth test pad 196 are electrically connected. Similarly, the second switch 175C is coupled to a plurality of second switches through the second connection wires 155A and 155B. The two connection pads 135 are used to control whether the two second connection pads 135 are electrically connected. The second switch 175D is coupled between two of the plurality of second sensing electrodes 125A-125H through the second connection wires 155A and 155B to control whether the two second sensing electrodes 125A-125H are electrically connected. Sexual connection. In this embodiment, the second switches 180A, 180B, 180C, and 180D are located in the peripheral area 114. The second switch 180 is located on one side of the active area 112, and the other second switches 180A, 180B, and 180C are located in the active area. The other side of the region 112 is such that the second switches 180A, 180B, 180C, the first test pad 190, the second test pad 192, the third test pad 194, and the fourth test pad 196 are disposed on the same side. However, the present invention is not limited to this. In other embodiments, the position of the second switch can be adjusted according to the layout design, the test pad, and the layout of the peripheral area, and the second sensing electrode and the second connection pad can be controlled. 3. The electrical conduction relationship between the third test pad and the fourth test pad is sufficient. In some embodiments, the plurality of first switches 170A, 170B, 170C, and 170D and the plurality of second switches 175A, 175B, 175C, and 175D may be thin film transistors (TFTs), but the present invention is not limited thereto.

See Figure 2A. FIG. 2A is a schematic diagram of a display panel 200A according to some embodiments of the present invention. The display panel 200A is the same as the display panel 100 in FIG. 1, but for the convenience of explanation and understanding, the display panel 200A only shows a part of components and traces of the display panel 100 in FIG. 1 to express each component and the first The connection relationship between the test pad 190 and the second test pad 192. As shown in Figure 2A, the first sensing electrodes 120A, 120B, 120C, and 120D are connected in series with each other to form a first sensing electrode string, and the first sensing electrodes 120E, 120F, 120G, and 120H are connected in series with each other to form a first sensing electrode string. A sensing electrode string. In detail, starting from the first test pad 190, the first sensing pad 120A is connected to the first sensing electrode 120A via the first peripheral wiring 160A, the first switch 170A, the first transmission wiring 140, and the first connection pad 130. The test electrode 120A is connected to the first sensing electrode 120B through the first connection wiring 150A and the first switch 170D. The first sensing electrode 120B is connected to the first transmission wiring 140, the first connection pad 130, and the first connection wiring 150B. 1. The first switch 170C is connected to the first sensing electrode 120C, the first sensing electrode 120C is connected to the first sensing electrode 120D via the first connection trace 150A, the first switch 170D is connected to the first sensing electrode 120D, and the first sensing electrode 120D is connected via the first The transmission trace 140, the first connection pad 130, the first switch 170B, and the first peripheral trace 160B are connected to the second test pad 192 to form a first sensing electrode string. Starting from the first test pad 190, it is connected to the sensing electrode 120E through the first peripheral wiring 160A, the first switch 170A, the first transmission wiring 140, and the first connection pad 130, and the sensing electrode 120E is connected to the 150A The first switch 170D is connected to the first sensing electrode 120F. The first sensing electrode 120F is connected to the first sensor via the first transmission line 140, the first connection pad 130, the first connection line 150B, and the first switch 170C. The measuring electrode 120G, the first sensing electrode 120G is connected to the first sensing electrode 120H via the first connection wiring 150A and the first switch 170D, and the first sensing electrode 120H is connected via the first transmission wiring 140 and the first connection pad 130 The first switch 170B and the first peripheral trace 160B are connected to the second test pad 192 to form another first sensing electrode string. The first sensing electrode string of the first sensing electrodes 120A, 120B, 120C, and 120D and another first sensing electrode string of the first sensing electrodes 120E, 120F, 120G, and 120H are connected to each other in parallel. In other words, the first test pad 190 is electrically connected to the second test pad through a plurality of first sensing electrodes. In the conducting path of the test pad 192, a first sensing electrode string may be formed. In this way, the display panel can form a plurality of first sensing electrode strings, and these first sensing electrode strings are in a parallel relationship. As shown in the embodiment of FIG. 2A, the display panel 200A is provided with two first sensing electrode strings, one of which is a first test pad 190, a first sensing electrode 120A, a first sensing electrode 120B, A conductive path formed by a sensing electrode 120C, a first sensing electrode 120D, and a second test pad 192; the other is a first test pad 190, a first sensing electrode 120E, a first sensing electrode 120F, and a first sensing pad. The conductive paths formed by the test electrodes 120G, the first sensing electrodes 120H, and the second test pad 192.

In some embodiments, the first sensing electrodes 120A-120H are connected in series with each other through a plurality of first transmission lines 140, a plurality of first peripheral lines 160A, 160B and a plurality of first connection lines 150A, 150B and / Or in parallel. The number of series and parallel connections of the first sensing electrodes 120A-120H as shown in FIG. 2A is only an example, and this case is not limited thereto.

See Figure 2B. FIG. 2B is a schematic diagram of a display panel 200B according to some embodiments of the present invention. The display panel 200B is the same as the display panel 100 in FIG. 1, but for the convenience of explanation and understanding, the display panel 200B only shows a part of the elements and wirings of the display panel 100 in FIG. 1. As shown in FIG. 2B, the second sensing electrodes 125A, 125B, 125C, and 125D are connected in series with each other to form a second sensing electrode string, and the second sensing electrodes 125E, 125F, 125G, and 125H are connected in series with each other to form a second sensing electrode. Test electrode string. In detail, starting from the third test pad 194, it is connected to the second sensing electrode 125A via the second peripheral wiring 165A, the second switch 175A, the second transmission wiring 145, and the second connection pad 135. 125A electrode The wiring 155A and the second switch 175D are connected to the second sensing electrode 125B. The second sensing electrode 125B is connected through the second transmission wiring 145, the second connection pad 135, the second connection wiring 155B, and the second switch 175C. To the second sensing electrode 125C, the second sensing electrode 125C is connected to the second sensing electrode 125D through the second connection wiring 155A and the second switch 175D, and the second sensing electrode 125D is connected through the second transmission wiring 145, the first The two connection pads 135, the second switch 175B, and the second peripheral wiring 165B are connected to the fourth test pad 196 to form a second sensing electrode string. Starting from the third test pad 194, the second sensing electrode 125E is connected to the second sensing electrode 125E through the second peripheral wiring 165A, the second switch 175A, the second transmission wiring 145, and the second connection pad 135. The second connection wiring 155A and the second switch 175D are connected to the second sensing electrode 125F. The second sensing electrode 125F passes through the second transmission wiring 145, the second connection pad 135, the second connection wiring 155B, and the second switch. 175C is connected to the second sensing electrode 125G, the second sensing electrode 125G is connected to the second sensing electrode 125H through the second connection wiring 155A, the second switch 175D, and the second sensing electrode 125H is connected to the second transmission wiring 145 The second connection pad 135, the second switch 175B, and the second peripheral trace 165B are connected to the fourth test pad 196 to form another second sensing electrode string. A second sensing electrode string formed by the second sensing electrodes 125A, 125B, 125C, 125D connected in series with each other and a second sensing electrode string formed by the second sensing electrodes 125E, 125F, 125G, 125H connected in series with each other Parallel to each other. In other words, a second sensing electrode string may be formed in a conducting path electrically connected from the third test pad 194 to the fourth test pad 196 through the plurality of second sensing electrodes. In this way, the display panel can form a plurality of second sensing electrode strings, and these second sensing electrode strings are Now in parallel relationship. As shown in the embodiment of FIG. 2B, the display panel 200B is provided with two second sensing electrode strings, one of which is a third test pad 194, a second sensing electrode 125A, a second sensing electrode 125B, a first Conduction paths formed by the two sensing electrodes 125C, the second sensing electrode 125D, and the fourth test pad 196; the other is the third test pad 194, the second sensing electrode 125E, the second sensing electrode 125F, and the second sensing pad. Conducting paths formed by the test electrodes 125G, the second sensing electrodes 125H, and the fourth test pad 196.

In some embodiments, the second sensing electrodes 125A-125H are connected in series with each other through a plurality of second transmission lines 145, a plurality of second peripheral lines 165A, 165B and a plurality of second connection lines 155A, 155B and / Or in parallel. The number of series and parallel connections of the second sensing electrodes 125A-125H as shown in FIG. 2B is only an example, and this case is not limited thereto.

See Figure 3. FIG. 3 is a schematic diagram of a display panel 300 according to some embodiments of the present invention. As shown in FIG. 3, a plurality of first sensing electrodes 120A-120H and a plurality of second sensing electrodes 125A-125H are disposed in the active region 112. The active area 112 includes a plurality of sensing areas 310A-310D. The sensing area 310A includes first sensing electrodes 120A-120D and second sensing electrodes 125A-125D. The sensing area 310B includes a first sensing electrode 120E-120H and a second sensing electrode 125E-125H. The connection manner of the first sensing electrodes 120A-120D and the second sensing electrodes 125A-125D in the sensing area 310A is as shown in FIG. 1, FIG. 2A, or FIG. 2B. The connection manner of the first sensing electrodes 120E-120H and the second sensing electrodes 125E-125H in the sensing area 310B is as shown in FIG. 1, FIG. 2A, or FIG. 2B. For the convenience of explanation, the connection method in each sensing area is not shown in Figure 3. Figure 3 shows the connection relationship between each sensing area and its external components.

For example, as shown in FIG. 1, the first sensing electrodes 120 in the same sensing area are coupled through at least one of the plurality of first switches 170A, 170B, 170C, and 170D to form a first Sense electrode string. The second sensing electrodes 125 in the same sensing area are coupled through at least one of the plurality of second switches 175A, 175B, 175C, and 175D to form a second sensing electrode string. The display panel 300 in FIG. 3 is another embodiment of the display panel 100 in FIG. 1.

For the convenience of explanation and understanding, FIG. 3 only shows some of the components and traces in FIG. 1. However, the connection methods between the components of the display panel 300 in FIG. 3 and the display panel in FIG. 1 The connections between the various components of the 100 are similar.

Please refer to FIG. 3 again, a plurality of first sensing electrode strings located in different sensing regions are coupled in parallel to the first test pad 190 and the second test pad 192. A plurality of second sensing electrode strings located in different sensing regions are coupled in parallel to the third test pad 194 and the fourth test pad 196. For example, the first sensing electrode string located in the sensing area 310A and the first sensing electrode string located in the sensing area 310B are coupled in parallel to the first test pad 190 and the second test pad 192. In detail, the conduction path formed by the first test pad 190, the first sensing electrode 120A, the first sensing electrode 120B, the first sensing electrode 120C, the first sensing electrode 120D, and the second test pad 192, Formed with the first test pad 190, the first sensing electrode 120E, the first sensing electrode 120F, the first sensing electrode 120G, the first sensing electrode 120H, and the second test pad 192 The conduction paths are parallel to each other. The second sensing electrode string located in the sensing area 310A and the second sensing electrode string located in the sensing area 310B are coupled in parallel to the third test pad 194 and the fourth test pad 196. In detail, the conduction path formed by the third test pad 194, the second sensing electrode 125A, the second sensing electrode 125B, the second sensing electrode 125C, the second sensing electrode 125D, and the fourth test pad 196, The conductive paths formed by the third test pad 194, the second sensing electrode 125E, the second sensing electrode 125F, the second sensing electrode 125G, the second sensing electrode 125H, and the fourth test pad 196 are connected in parallel with each other.

For the convenience of explanation and understanding, the detailed detection methods of FIG. 1, FIG. 2A, FIG. 2B, and FIG. 3 will be described below in conjunction with FIG. 4.

See Figure 4. FIG. 4 is a flowchart of a detection method 400 according to some embodiments of the present invention. The detection method 400 includes the following steps: S410: Turn on at least one of the plurality of first switches to turn on at least one of the plurality of first sensing electrodes; S420: Measure through the first test pad and the second test pad First impedance value; S430: turning on at least one of the plurality of second switches to turn on at least one of the plurality of second sensing electrodes; S440: measuring the second through the third test pad and the fourth test pad Impedance value; S450: judging at least one of the plurality of first sensing electrodes and at least one of the plurality of second sensing electrodes according to the first impedance value and the second impedance value Whether one is in an open circuit state; S460: Measure the third impedance value via the second test pad and the third test pad; and S470: Determine at least one of the plurality of first sensing electrodes and more according to the third impedance value. Whether at least one of the second sensing electrodes is in a short-circuit state.

Step S410: Turn on at least one of the plurality of first switches to turn on at least one of the plurality of first sensing electrodes. Please refer to Figure 4 and Figure 2A together. In some embodiments, the first switch 170D coupled between the first sensing electrode 120A and the first sensing electrode 120B is turned on, and the coupling between the first sensing electrode 120A and the first sensing electrode 120C is turned on. The first switch 170D is turned on, and the first switch 170C coupled between the first sensing electrode 120B and the first sensing electrode 120C through at least one of the plurality of first connection pads 130 is turned on. A connection pad 130 is coupled to at least one of the first switches 170A between the first sensing electrode 120B and the first test pad 190, and is coupled through at least one of the plurality of first connection pads 130. The first switch 170B is connected between the first sensing electrode 120D and the second test pad 192 to turn on the first sensing electrodes 120A, 120B, 120C, and 120D.

The above example is a case where only one first sensing electrode string is turned on. In this case, multiple first sensing electrode strings may be turned on at the same time, which is not limited in this case. In some embodiments, step S410 may be performed by a wafer in the peripheral region 114. Specifically, step S410 is to control the first switch so that each first sensing electrode can be electrically connected to the first test pad 190 and the second test pad 192, which means that even if the first sensing electrode string can form an electrically conductive path.

Step S420: Measure the first impedance value via the first test pad and the second test pad. For example, in some embodiments, if the first sensing electrodes 120A-120D are turned on in step S410, in step S420, the first sensing can be measured via the first test pad 190 and the second test pad 192. The first impedance value of the electrodes 120A-120D. If the first sensing electrodes 120A-120H are turned on in step S410, the first impedance values of the first sensing electrodes 120A-120H can be measured through the first test pad 190 and the second test pad 192 in step S420. In some embodiments, step S420 may be performed by a tri-meter. In some embodiments, step S420 may be performed by a wafer in the peripheral region 114.

Step S430: Turn on at least one of the plurality of second switches to turn on at least one of the plurality of second sensing electrodes. Please refer to Figure 4 and Figure 2B together. In some embodiments, the second switch 175D coupled between the second sensing electrode 125A and the second sensing electrode 125B is turned on, and the second switch 175D is coupled between the second sensing electrode 125A and the second sensing electrode 125C. The second switch 175D is turned on, and the second switch 175C coupled between the second sensing electrode 125B and the second sensing electrode 125C through at least one of the plurality of second connection pads 135 is turned on. At least one of the two connection pads 135 is coupled to the second switch 175A between the second sensing electrode 125B and the third test pad 194, and is coupled through at least one of the plurality of second connection pads 135. A second switch 175B is connected between the second sensing electrode 125D and the fourth test pad 196 to turn on the second sensing electrodes 125A, 125B, 125C, and 125D.

The above example is a case where only one second sensing electrode string is turned on. In this case, multiple second sensing electrode strings may be turned on at the same time, which is not limited in this case. In some embodiments, step S430 may be performed by the crystal of the peripheral region 114. Film. Specifically, step S430 controls the second switch so that each second sensing electrode can be electrically connected to the third test pad 194 and the fourth test pad 196, which means that even if the second sensing electrode string can form an electrically conductive path.

Step S440: Measure the second impedance value via the third test pad and the fourth test pad. For example, in some embodiments, if the second sensing electrodes 125A-125D are turned on in step S430, the second sensing can be measured through the third test pad 194 and the fourth test pad 196 in step S440. The first impedance value of the electrodes 125A-125D. If it is in step S430 that the second sensing electrodes 125A-125J are turned on, in step S440, the first impedance value of the second sensing electrodes 125A-125H can be measured through the third test pad 194 and the fourth test pad 196. In some embodiments, step S440 may be performed by a tri-meter. In some embodiments, step S440 may be performed by the wafer of the peripheral region 114.

S450: Determine whether at least one of the plurality of first sensing electrodes and at least one of the plurality of second sensing electrodes are in an open state according to the first impedance value and the second impedance value. For example, the first sensing electrodes 120A-120D and the second sensing electrodes 125A- 120D can be determined based on the first impedance values of the first sensing electrodes 120A-120D and the second impedance values of the second sensing electrodes 125A-125D. Whether 125D is open. For example, a first impedance value of the first sensing electrodes 120A-120D located in the first sensing area 310A and a second impedance of the second sensing electrodes 125A-125D located in the first sensing area 310A are measured. value. Determine whether the measured impedance difference between the first impedance value and the second impedance value is greater than the impedance difference threshold. If it is determined that the impedance difference value is greater than the impedance difference threshold, it is determined that the first sensing electrodes 120A-120D and the second sensing electrodes 125A-125D are in an open state. In some embodiments, step S450 may be performed by Performed by the wafer of the peripheral region 114.

In some embodiments, steps S410 and S430 are further included in the first time, turning on a part of the plurality of first switches to turn on the first sensing electrodes located in the first sensing area, and turning on the second switches. Partly to turn on the second sensing electrode located in the first sensing area, and to turn on part of the plurality of first switches at the second time to turn on the first sensing electrode located in the second sensing area, to turn on a plurality of A part of the second switch is used to turn on the second sensing electrode located in the second sensing area.

Please refer to Figure 1, Figure 3 and Figure 4 together. For example, in some embodiments, step S410 is performed at the first time to turn on parts of 170A-170D of the plurality of first switches to turn on the first sensing electrode 120 located in the first sensing area 310A and execute Step S420, measuring the first impedance value of the first sensing electrode 120 located in the first sensing area 310A through the first test pad 190 and the second test pad 192, and performing step S430, turning on a plurality of second switches 175A-175D Part of the method is to turn on the second sensing electrode 125 located in the first sensing area 310A, execute step S440, and measure the second located in the first sensing area 310A through the third test pad 194 and the fourth test pad 196. The second impedance value of the sensing electrode 125.

At the second time, step S410 is executed to turn on parts of 170A-170D of the plurality of first switches to turn on the first sensing electrode 120 located in the second sensing area 310B, and then step S420 is performed through the first test pad 190 and The second test pad 192 measures a first impedance value of the first sensing electrode 120 located in the second sensing area 310B, and executes step S430 to turn on a part of the plurality of second switches 175A-175D to turn on the second sensing Zone 310B The two sensing electrodes 125 execute step S440 to measure the second impedance value of the second sensing electrode 125 located in the second sensing region 310B through the third test pad 194 and the fourth test pad 196. The rest and so on. In some embodiments, step S450 may be performed by a wafer in the peripheral region 114.

See Figure 5. FIG. 5 is a flowchart of a step S450 according to some embodiments of the present invention. Step S450 includes the following steps: S452: judging whether the measured impedance difference between the first impedance value and the second impedance value is greater than the impedance difference threshold; and S454: when the impedance difference is greater than the impedance difference threshold, determining that the At least one of the first sensing electrode and the second sensing electrode in a sensing area is open.

Step S452: Determine whether the measured impedance difference between the first impedance value and the second impedance value is greater than an impedance difference threshold. For example, in steps S410-S440, the first impedance value in the first sensing area 310A and the second impedance value in the first sensing area 310A are measured. In step S452, it is determined whether the impedance difference between the first impedance value and the second impedance value measured at the first time is greater than the impedance difference threshold. For another example, if the first impedance value in the second sensing area 310B and the second impedance value in the second sensing area 310B are measured in steps S410-S440, in step S452, determine in Whether the impedance difference between the first impedance value and the second impedance value measured at the second time is greater than the impedance difference threshold.

Step S454: When the impedance difference value is greater than the impedance difference threshold, it is determined that at least one of the first sensing electrode and the second sensing electrode is an open circuit. For example In other words, the difference between the first impedance value and the second impedance value in the first sensing area 310A is determined at the first time. If the difference is greater than the impedance difference threshold, the first sensing electrodes 120A-120D or the second sensing electrodes 125A-125D indicated in the first sensing area 310A have an open circuit condition. Specifically, by comparing the impedance values of the same number of first sensing electrodes and the impedance values of the second sensing electrodes in the same region to determine whether there is an open circuit state.

For another example, the difference between the first impedance value in the first sensing area 310A and the second impedance value in the second sensing area 310B is determined at the first time. If the difference is greater than the impedance difference threshold, the first sensing electrodes 120A-120D in the first sensing area 310A or the second sensing electrodes 125E-125H in the second sensing area 310B have an open circuit condition. Specifically, the impedance value of the same number of first sensing electrodes and the impedance value of the second sensing electrodes in the corresponding region are compared to determine whether there is an open circuit state. For example, the first sensing area 310A and the second sensing area 310B are symmetrical on the display panel 300, and the first sensing area 310A and the second sensing area 310B are opposite to the peripheral area 114 on the display panel 300. The distance of the wafers is the same.

Please refer back to Figure 4. Step S460: Measure the third impedance value via the second test pad and the third test pad. Please refer to Figure 4 and Figure 1 together. For example, at least one of the plurality of first sensing electrodes 120 and at least one of the plurality of second sensing electrodes 125 are simultaneously turned on, and measured through the second test pad 192 and the third test pad 194. The third impedance value. Specifically, please refer to FIG. 1. In some embodiments, starting from the first sensing electrode 120A, connected to the first sensing electrode 120B via the first connection trace 150A and the first switch 170D, The sensing electrode 120B is routed through the first transmission line. 140. The first connection pad 130, the first switch 170C, and the first connection wiring 150B are connected to the first sensing electrode 120C. The first sensing electrode 120C is connected to the first sensing electrode 120C through the first connection wiring 150A and the first switch 170D. A sensing electrode 120D is connected from the first sensing electrode 120D to the second test pad 192 through the first peripheral wiring 160B, the first switch 170B, the first connection wiring 150B, and the first connection pad 130. Starting from the second sensing electrode 125A, it is connected to the second sensing electrode 125B via the second connection wiring 155A and the second switch 175D, and the second sensing electrode 125B is connected via the second transmission wiring 145 and the second connection. The pad 135, the second switch 175C, and the second connection wiring 155B are connected to the second sensing electrode 125C. The second sensing electrode 125C is connected to the second sensing electrode 125D through the second connection wiring 155A and the second switch 175D. The second sensing electrode 125D is connected to the third test pad 194 through the second peripheral wiring 165B, the second switch 175B, the second connection wiring 155B, and the second connection pad 135. By turning on the first switches 170A, 170B, 170C, and 170D and the second switches 175A, 175B, 175C, and 175D, the first sensing electrodes 120A-120D and the second sensing electrodes 125A-125D can be turned on, and Through the second test pad 192 and the third test pad 194, a third impedance value is measured. In some embodiments, step S460 may be performed by a tri-meter. In some embodiments, step S460 may be performed by the wafer of the peripheral region 114.

S470: Determine whether at least one of the plurality of first sensing electrodes and at least one of the plurality of second sensing electrodes are in a short-circuit state according to the third impedance value. For example, if it is determined that the third impedance value measured in step S460 is too large, the three-meter meter emits a warning sound. In S470, it can be determined that at least one of the plurality of first sensing electrodes and the plurality of first sensing electrodes To in two sensing electrodes One of them is short-circuited. In some embodiments, if at least one of the first sensing electrodes and at least one of the plurality of second sensing electrodes are in a short-circuit state, the three-meter meter will detect and display the presence of the short-circuited sensing. The electrode, for example, emits a warning sound. If at least one of the first sensing electrodes and at least one of the plurality of second sensing electrodes are not in a short-circuit state, the tri-meter will not issue a warning sound to warn of the presence of a short-circuit. In some embodiments, step S470 may be performed by the wafer in the peripheral region 114.

The detection method 400 shown in FIG. 4 is used for illustration only. It is within the scope of this disclosure to perform steps S410-S470 in different orders.

In summary, as shown in FIG. 1, the first sensing electrodes 120A-120H and the second sensing electrodes 125A-125H can be divided into a large area for detection. Alternatively, as shown in FIG. 3, the first sensing electrodes 120A-120H and the second sensing electrodes 125A-125H can also be divided into a plurality of regions, and the impedance detection can be compared by partitions. Dividing the first sensing electrodes 120A-120H and the second sensing electrodes 125A-125H into a large area for detection can detect all the sensing electrodes at one time, and by connecting the sensing electrodes in series and in parallel, the selective detection portion To avoid the problem that the impedance value is too large and difficult to measure when too many sensing electrodes are connected in series. On the other hand, because different sensing electrodes are at different distances from the test pads 190-196, and have different impedance values according to different distances, if shown in Figure 3, the first sensing electrodes 120A-120H And the second sensing electrodes 125A-125H are divided into a plurality of regions, and the impedance detection is compared in sections, which can effectively reduce the measurement error caused by the different distances of the different sensing electrodes from the test pads 190-196.

As mentioned above, the transmission lines 140 and 145, the connection lines 150A, 150B, 155A, 155B, and the peripheral lines 160A, 160B, 165A, and 165B may be formed between the second metal layer, the third metal layer, or between the two metal layers. Cross line.

It can be known from the implementation of the above-mentioned case that the embodiment of the present case provides a detection method and a display panel, and particularly relates to a detection method and a display panel for detecting a sensing electrode, so as to be effective in the production process of a touch display panel. Check for shorts or open circuits between multiple sensing electrodes.

In addition, the above-mentioned illustration includes sequential exemplary steps, but the steps need not be performed in the order shown. It is within the scope of this disclosure to perform these steps in different orders. Within the spirit and scope of the embodiments of the present disclosure, these steps may be added, replaced, changed, and / or omitted as appropriate.

Although this case has been disclosed as above in the form of implementation, it is not intended to limit the case. Any person skilled in this art can make various modifications and retouches without departing from the spirit and scope of the case. Therefore, the scope of protection of this case should be considered after The attached application patent shall prevail.

Claims (10)

A detection method for detecting a display panel including a plurality of first sensing electrodes, a plurality of second sensing electrodes, a first test pad, a second test pad, a third test pad, and a A fourth test pad, a plurality of first switches, and a plurality of second switches, the first sensing electrodes and the second sensing electrodes are staggered, and the first sensing electrodes respectively pass through the first switches and The first test pad and the second test pad are electrically connected, and the second sensing electrodes are electrically connected to the third test pad and the fourth test pad through the second switches, respectively. The detection method includes: Turn on at least one of the first switches to turn on at least one of the first sensing electrodes; measure a first impedance value through the first test pad and the second test pad; turn on the At least one of the second switches to turn on at least one of the second sensing electrodes; measure a second impedance value through the third test pad and the fourth test pad; according to the first impedance value Judging the first senses with the second impedance value Whether at least one of the electrodes and at least one of the second sensing electrodes are in an open circuit state; a third impedance value is measured via the second test pad and the third test pad; and according to the third The impedance value determines whether at least one of the first sensing electrodes and at least one of the second sensing electrodes are in a short circuit state. The detection method according to claim 1, wherein the display panel further includes a first sensing area and a second sensing area, and the first sensing area and the second sensing area respectively include the first sensing areas. At least one of the sensing electrodes and at least one of the second sensing electrodes, wherein at least one of the first switches is turned on to turn on at least one of the first sensing electrodes and turn on the At least one of the second switches to turn on at least one of the second sensing electrodes further includes: at a first time, turning on a part of the first switches to turn on the first sensing area The first sensing electrodes and a portion of the second switches that are turned on to turn on the second sensing electrodes that are located in the first sensing area; and that the first switches are turned on at a second time Part of it is to turn on the first sensing electrodes located in the second sensing area, and to turn on part of the second switches to turn on the second sensing electrodes located in the second sensing area. The detection method according to claim 2, wherein whether at least one of the first sensing electrodes and at least one of the second sensing electrodes are determined according to the first impedance value and the second impedance value. Opening the circuit further includes: determining whether an impedance difference between the first impedance value and the second impedance value measured at the first time is greater than an impedance difference threshold; and when the impedance difference is greater than the impedance When the difference threshold value is determined, it is determined that at least one of the first sensing electrodes and the second sensing electrodes located in the first sensing area is an open circuit. The detection method according to claim 3, wherein whether at least one of the first sensing electrodes and at least one of the second sensing electrodes are determined according to the first impedance value and the second impedance value. Opening the circuit further includes: determining whether an impedance difference between the first impedance value and the second impedance value measured at the second time is greater than an impedance difference threshold; and when the impedance difference is greater than the impedance When the difference threshold value is determined, it is determined that at least one of the first sensing electrodes and the second sensing electrodes located in the second sensing area is an open circuit. A display panel includes: a substrate having an active area and a peripheral area, wherein the peripheral area is adjacent to the active area; a plurality of first sensing electrodes are disposed in the active area; a plurality of second sensing electrodes are disposed In the active area, and the first sensing electrodes and the second sensing electrodes are staggered with each other; a plurality of first switches and a plurality of second switches; a first test pad and a second test pad, respectively The first test pad and the second test pad are respectively connected to the first sensing electrodes through the first switches; a third test pad and a fourth test pad, respectively; And the third test pad and the fourth test pad are electrically connected to the second sensing electrodes through the second switches, respectively; the plurality of first connection pads and the plurality of second connection pads And the first connection pads are electrically connected to one of the first sensing electrodes, and the second connection pads are electrically connected to one of the second sensing electrodes; Transmission lines, which are respectively coupled to the first sensing circuits One of the first connection pads and one of the first connection pads; the plurality of second transmission lines are respectively coupled to one of the second sensing electrodes and one of the second connection pads; A plurality of first peripheral traces respectively coupled between one of the first connection pads and the first test pad and between one of the first connection pads and the second test pad; A second peripheral trace, respectively coupled between one of the second connection pads and the third test pad, and between one of the second connection pads and the fourth test pad; First connection traces are respectively coupled between the first connection pads and between the first sensing electrodes; and a plurality of second connection traces are respectively connected to the first connection pads. Between the second connection pads and between the second sensing electrodes. The display panel according to claim 5, wherein some of the first sensing electrodes are connected in series with each other to form a first sensing electrode string, so that the first sensing electrodes can form a plurality of first sensing electrode strings. And the first sensing electrode strings are connected in parallel with each other. The display panel according to claim 6, wherein some of the second sensing electrodes are connected in series with each other to form a second sensing electrode string, so that the second sensing electrodes can form a plurality of second sensing electrode strings. And the second sensing electrode strings are connected in parallel with each other. The display panel according to claim 7, wherein the first sensing electrodes are connected in series and / or in parallel with each other through the first transmission wires, the first peripheral wires, and the first connection wires, wherein The second sensing electrodes are connected in series and / or in parallel with each other through the second transmission traces, the second peripheral traces and the second connection traces. The display panel according to claim 5, wherein the first switches are respectively disposed in the peripheral area, and the first switches are respectively coupled to the first connection pads through the first peripheral wires. One is connected to the first test pad, one of the first connection pads and the second test pad, and is coupled to two of the first connection pads through the first connection traces Between the two, between the first sensing electrodes; and the second switches are respectively disposed in the peripheral region, wherein the second switches are respectively coupled to the second peripheral wires through the second peripheral wires. One of the second connection pads and the third test pad, one of the second connection pads and the fourth test pad, and the first connection pads are coupled to the first connection pads through the second connection traces. Between the two connection pads and between the second sensing electrodes. The display panel according to claim 9, further comprising: a first sensing area including a part of the first sensing electrodes and a part of the second sensing electrodes, wherein the first sensing areas Parts of the electrodes may be coupled through at least one of the first switches to form a first sensing electrode string, and parts of the second sensing electrodes may be through at least one of the second switches. And coupled to form a second sensing electrode string; and a second sensing region including another part of the first sensing electrodes and another part of the second sensing electrodes, wherein Another part of the second sensing electrodes may be coupled through at least one of the first switches to form another first sensing electrode string, and another part of the second sensing electrodes may be transmitted through the At least one of the second switches is coupled to form another second sensing electrode string; wherein the first sensing electrode strings located in the first sensing area and the second sensing area Then coupled in parallel to the first test pad and the second test pad, located at the first sensing pad The second sensing electrode strings of the area and the second sensing area are coupled in parallel to the third test pad and the fourth test pad.