TW201809993A - Inspection method - Google Patents

Abstract

An inspection method used to inspect an in-cell touch display panel is provided. The inspection method includes following steps. A first voltage difference between pixel electrodes and first touch electrodes and corresponding to a first brightness is caused during a first time. A second voltage difference between the pixel electrodes and the first touch electrodes and corresponding to a second brightness is caused during a second time. A first touch electrode whose end is located within a first region is judged to be abnormal when the first region does not present the first brightness during the first time, the first region does not present the second brightness during the second time or the first region does not present the first brightness and the second brightness during the first time and the second time.

Description

Detection method

The invention relates to a detection method, and in particular to a method for detecting an in-cell touch display panel.

In general, according to the relative positions of the touch electrodes and the display panel, the touch display panel can be divided into an added-on type, an on-cell type, and an in-cell type. An added-on touch display panel includes a display panel and a touch substrate externally attached to the display panel. The touch substrate includes a protective substrate and touch electrodes formed on the protective substrate. The touch electrode is located between the protection substrate and the display panel. However, the thickness of the externally attached touch display panel is thick, which is not conducive to the thinning of the electronic device.

An on-cell touch display panel includes a display panel and touch electrodes formed on the outer surface of the display panel. However, the touch electrodes on the outer surface of the display panel are easily damaged during the manufacturing process or use, which is not conducive to the yield and durability of the electronic device. An in-cell touch display panel includes a display panel and touch electrodes. The touch electrodes of the in-cell touch display panel are disposed between one of the substrates of the display panel and the display medium, so as to facilitate thinning, yield and durability of the electronic device. Therefore, the in-cell touch display panel has become another development focus of the touch display panel. However, since the touch electrodes of the in-cell touch display panel are integrated on one substrate of the display panel, and the substrate of the display panel has no extra space, multiple detection pads corresponding to the multiple touch electrodes can be provided, As a result, it is difficult to detect the touch electrodes of the in-cell touch display panel.

The invention provides a detection method for detecting an in-cell touch display panel.

The detection method of the present invention is used to detect an in-cell touch display panel. The in-cell touch display panel has multiple pixel electrodes and multiple first touch electrodes. Each first touch electrode has an endpoint. The multiple end points of the multiple first touch electrodes are respectively located in different multiple first regions. The detection method includes the following steps: within a first time, there is a first voltage difference between the pixel electrode and the first touch electrode corresponding to the first brightness; during a second time, the pixel electrode and the first touch There is a second voltage difference between the electrodes corresponding to the second brightness; the first area does not exhibit the first brightness during the first time, the first area does not exhibit the second brightness during the second time, or the first If the first area does not exhibit the first brightness within the time and the first area does not exhibit the second brightness within the second time, it is determined that the first touch electrode whose endpoint is located in the first area is abnormal.

In an embodiment of the invention, the above-mentioned in-cell touch display panel further has a plurality of second touch electrodes. Each second touch electrode has an endpoint. The plurality of end points of the plurality of second touch electrodes are respectively located in the plurality of second areas different from the first area. The detection method further includes the following steps: during the first time, a second voltage difference corresponding to the second brightness exists between the pixel electrode and the second touch electrode; during the second time, the pixel electrode and the second touch There is a first voltage difference corresponding to the first brightness between the control electrodes.

In an embodiment of the present invention, the second area does not exhibit the second brightness within the first time, the second area does not exhibit the first brightness within the second time, or the second area does not appear within the first time If the second brightness does not exhibit the first brightness in the second area within the second time, it is determined that the second touch electrode whose endpoint is located in the second area is abnormal.

In an embodiment of the invention, the plurality of first regions where the end points of the plurality of first touch electrodes are located are arranged in an array and located on the left side of the in-cell touch panel, and the plurality of second regions The second regions where the multiple end points of the touch electrodes are located are arranged in another array and are located on the right side of the in-cell touch panel.

In an embodiment of the present invention, the first area exhibits a second brightness different from the other first areas during the above-mentioned first time, and the first area exhibits a different first brightness from the other during the second time If the first brightness is different in the area, it is determined that the first touch electrode whose end point is in the first area is open. In the first time, the second area presents a first brightness different from other second areas, and in the second time, the second area presents a second brightness different from other second areas, then the endpoint is determined The second touch electrode located in the second area is open.

In an embodiment of the invention, the first regions where the multiple endpoints of the first plurality of touch electrodes are located and the second regions where the multiple endpoints of the plurality of second touch electrodes are located They are alternately arranged in the first direction and the second direction interlaced with the first direction.

In an embodiment of the present invention, an adjacent first area and a second area exhibit the same second brightness during the above-mentioned first time, and the adjacent first area and all If the second area exhibits the same first brightness, it is determined that the first touch electrode whose endpoint is located in the first area is short-circuited with one of the second touch electrodes.

In an embodiment of the invention, the above-mentioned in-cell touch display panel further has a plurality of third touch electrodes and a plurality of fourth touch electrodes. The first touch electrode and the second touch electrode are located on the left side of the in-cell touch panel. The third touch electrode and the fourth touch electrode are located on the right side of the in-cell touch panel. The plurality of third areas where the plurality of endpoints of the third touch electrode are located and the fourth areas where the plurality of endpoints of the fourth touch electrode are located are alternately arranged in the first direction and the second direction.

In an embodiment of the present invention, during the above-mentioned first time, there is a first voltage difference corresponding to the first brightness between the pixel electrode and the third touch electrode, and the pixel electrode and the fourth touch There is a second voltage difference corresponding to the second brightness between the electrodes. During the second time, there is a second voltage difference corresponding to the second brightness between the pixel electrode and the third touch electrode, and there is a first corresponding to the first brightness between the pixel electrode and the fourth touch electrode Voltage difference.

In an embodiment of the present invention, a third area adjacent to a fourth area exhibits the same first brightness during the first time described above, and the third area adjacent to the third area adjacent to the second time during the second time If the fourth area exhibits the same second brightness, it is determined that the fourth touch electrode whose end point is located in the fourth area is short-circuited with one of the third touch electrodes.

Based on the above, the detection method according to an embodiment of the present invention includes the following steps: within a first time, there is a first voltage difference corresponding to the first brightness between the pixel electrode and the first touch electrode; within a second time, The second voltage difference corresponding to the second brightness exists between the pixel electrode and the first touch electrode; and at least a first area does not exhibit the first brightness within a first time, and at least a first area within a second time If the second brightness is not present, or at least a first area does not exhibit the first brightness within the first time and at least a first area does not exhibit the second brightness within the second time, it is determined that the endpoint is located at a first position of the at least one area One touch electrode is abnormal. With the above detection method, there is no need to provide a plurality of detection pads corresponding to the plurality of touch electrodes and / or use a complicated circuit detection method to detect the touch electrodes. It can easily and quickly determine whether the touch electrodes of the in-cell touch display panel are abnormal.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of an in-cell touch display panel according to an embodiment of the invention. Referring to FIG. 1, the in-cell touch display panel 100 includes a first substrate 110, a second substrate 120, a display medium 130, a pixel electrode 140, and a touch electrode 150. The second substrate 120 is disposed opposite to the first substrate 110. The display medium 130 is located between the first substrate 110 and the second substrate 120. The pixel electrode 140 is located on the first substrate 110. In this embodiment, the in-cell touch display panel 100 further includes an active element 170 (for example: a thin film transistor). The insulating layer 160 covers the active element 170. The pixel electrode 140 is disposed on the insulating layer 160 and fills a contact hole 160a of the insulating layer 160 to be electrically connected to the active element 170. In this embodiment, the display medium 130 is, for example, liquid crystal, but the invention is not limited thereto. In other embodiments, the display medium 130 may also be an organic electroluminescent layer or other suitable materials.

Please refer to FIG. 1. In this embodiment, in addition to detecting the touch sensing signal, the touch electrode 150 can also be used as a common electrode to drive the display medium 130 together with the pixel electrode 140. In detail, the in-cell touch display panel 100 can perform touch sensing actions and display actions during alternating touch periods and display periods, respectively. During the touch period, the touch electrode 150 is used to sense the touch signal, thereby obtaining touch information of the user. During the display period, the touch electrode 150 serves as a common electrode, and the voltage difference between the common electrode and the pixel electrode 140 can drive the display medium 130, so that the in-cell touch display panel 100 displays a picture. However, the present invention is not limited to this. In other embodiments, the touch electrode 150 can also be independent of the common electrode. In other words, the touch electrode 150 and the common electrode can also be two different members.

Please refer to FIG. 1. In this embodiment, the touch electrode 150 may be located between the display medium 130 and the first substrate 110. The pixel electrode 140 and the touch electrode 150 can be selectively disposed on the same substrate (ie, the first substrate 110). Furthermore, the in-cell touch display panel 100 of this embodiment may be a display panel in Fringe-Field Switching (FFS) mode. However, the present invention is not limited to this. In other embodiments, the in-cell touch display panel 100 may also be a display panel in an in-plane switching (IPS) mode or other suitable modes. In addition, the present invention does not limit that the pixel electrode 140 and the touch electrode 150 must be disposed on the same substrate. In other embodiments, the pixel electrode 140 and the touch electrode 150 may also be disposed on two opposite substrates respectively. The following uses FIG. 2 as an example.

2 is a schematic cross-sectional view of an in-cell touch display panel according to another embodiment of the invention. The in-cell touch display panel 100A of FIG. 2 is similar to the in-cell touch display panel 100 of FIG. 1, so the same or corresponding components are denoted by the same or corresponding reference numerals. In the embodiment of FIG. 2, the touch electrode 150 may also be located between the second substrate 120 and the display medium 130. The pixel electrode 140 and the touch electrode 150 can also be disposed on the first substrate 110 and the second substrate 120, respectively. Furthermore, the in-cell touch display panel 100A can also be a twisted nematic (TN), vertical alignment (VA) mode or other appropriate mode display panel.

FIG. 3 is a schematic top view of a touch electrode according to an embodiment of the invention. Please refer to FIG. 3, the aforementioned touch electrode 150 includes a plurality of first touch electrodes 151. Each first touch electrode 151 has an endpoint 151a. The plurality of end points 151a of the plurality of first touch electrodes 151 are respectively located in different plurality of first regions 100a. Any one of the first regions 100a overlaps the corresponding at least one pixel electrode 140. In this embodiment, the plurality of first touch electrodes 151 can be divided into a plurality of touch electrode groups G, the plurality of touch electrode groups G can be arranged along the first direction x, each touch electrode group G includes With the plurality of first touch electrodes 151 sequentially arranged in the first direction x, the lengths of the plurality of first touch electrodes 151 of the same touch electrode group G in the second direction y may be sequentially decreased. In other words, the plurality of first regions 100a where the plurality of end points 151a of the plurality of first touch electrodes 151 of the same touch electrode group G can be arranged in a row, and the first regions 100a where all the end points 151a are located can be arranged An array, but the invention is not limited to this. The plurality of first touch electrodes 151 are electrically connected to the detection pad P. In this embodiment, to simplify the device for detecting the touch electrodes 150, all the first touch electrodes 151 may be electrically connected to the same detection pad P. However, the present invention is not limited to this. In other embodiments, the plurality of first touch electrodes 151 may also be electrically connected to different plurality of detection pads.

FIG. 4 illustrates the signals of the touch electrodes of the in-cell touch display panel according to an embodiment of the invention. For example, the signal shown in FIG. 4 can be used to detect the plurality of first touch electrodes 151 of FIG. 3. The upper graph of FIG. 4 shows the relationship between the time t and the voltage V ₁₄₀ , where the voltage V _{140 is} used for input to the pixel electrode 140 of the in-cell display panel 100 (or 100A). The lower graph of FIG. 4 shows the relationship between time t and voltage V _P , where voltage V _{P is} used to input to detection pad P electrically connected to first touch electrode 151. FIG. 5 shows a detection screen of the in-cell display panel 100 (or 100A) corresponding to FIG. 3 within the first time T1. Referring to FIGS. 3, 4 and 5, during the first time T1, the voltage V ₁₄₀ input to the pixel electrode ₁₄₀ is V, and the voltage V _P input to the detection pad _P is V1. In other words, within the first time T1, there is a first voltage difference V-V1 between the pixel electrode 140 and all the first touch electrodes 151. The first voltage difference V-V1 corresponds to the first brightness (that is, the first voltage difference V-V1 enables the end point 151a of the first touch electrode 151 to An area 100a presents the first brightness). For example, in this embodiment, the first voltage difference V-V1 may approach or be equal to 0, and the first voltage difference V-V1 should enable the first touch if the in-cell display panel 100 has no abnormalities. All the first regions 100a where the endpoint 151a of the control electrode 151 is located appear white. Please refer to FIG. 5, however, in this embodiment, within the first time T1, the first area 100a1 does not exhibit the first brightness (white). In other words, the voltage difference between the end point 151a of a certain first touch electrode 151 (eg, the end point 151a of the first area 100a1 in the third row and fifth column of FIG. 3) and the corresponding pixel electrode 140 Unexpected first voltage difference V-V1. At this time, it can be determined that the first touch electrode 151 whose end point 151a is located in the first area 100a1 is abnormal, for example, the first touch electrode 151 itself is broken.

FIG. 6 shows a detection screen of the in-cell display panel 100 (or 100A) corresponding to FIG. 3 within the second time T2. Referring to FIGS. 3, 4 and 6, during the second time T2, the voltage V ₁₄₀ input to the pixel electrode ₁₄₀ is V, and the voltage V _P input to the detection pad P is 0, for example. In other words, during the second time T2, there is a second voltage difference (V-0 = V) between the pixel electrode 140 and all the first touch electrodes 151. The second voltage difference (V-0 = V) corresponds to the second brightness, which means that the second voltage difference (V-0 = V) should enable the in-cell display panel 100 (or 100A) without abnormality The first area 100a where the endpoint 151a of the first touch electrode 151 is present exhibits the second brightness. For example, in this embodiment, when there is no abnormality in the in-cell display panel 100 (or 100A), the second voltage difference (V-0 = V) should enable the endpoint of the first touch electrode 151 All the first areas 100a where 151a are located appear black. Please refer to FIG. 6, however, in this embodiment, within the second time T2, the first area 100a1 does not appear to have the second brightness (black). In other words, the voltage difference between the end point 151a of a certain first touch electrode 151 and the corresponding pixel electrode 140 is not the second voltage difference (V-0 = V). At this time, it can be confirmed again that one of the first touch electrodes 151 where the end point 151a is located in the first area 100a1 is abnormal, for example, the first touch electrode 151 itself is broken.

It should be noted that in the embodiments of FIGS. 3 to 6, the steps of detecting the first touch electrode 151 are performed at the first time T1 and the second time T2 to repeatedly confirm that the endpoint 151a is located in the first area 100a1 One first touch electrode 151 is abnormal. However, the present invention is not limited to this. In other embodiments, performing the detection step corresponding to the first time T1 or performing the detection step corresponding to the second time T2 is sufficient to detect whether the plurality of first touch electrodes 151 are abnormal. In other words, a detection method including a detection step corresponding to the first time T1 or a detection method including a detection step corresponding to the second time T2 is also within the scope of the present invention.

It is worth mentioning that with the above detection method, each first touch electrode 151 does not need to correspond to a pad, which can reduce the number of probes required by the detection device. More importantly, with the above detection method, there is no need to provide a plurality of detection pads corresponding to the plurality of touch electrodes and / or use a complicated circuit detection method to detect the touch electrodes. Through the above-mentioned detection method, the tester can easily and quickly determine whether the touch electrodes of the in-cell touch display panel are abnormal with the naked eye or supplemented with optical equipment (such as a camera, etc.).

7 is a schematic top view of a touch electrode according to another embodiment of the invention. Please refer to FIG. 7, the aforementioned touch electrode 150 includes a plurality of first touch electrodes 151. Each first touch electrode 151 has an endpoint 151a. The plurality of end points 151a of the plurality of first touch electrodes 151 are respectively located in different plurality of first regions 100a. Each first area 100a overlaps with a corresponding at least one pixel electrode 140. In this embodiment, the aforementioned touch electrode 150 may further include a plurality of second touch electrodes 152. Each second touch electrode 152 has an endpoint 152a. The plurality of end points 152a of the plurality of second touch electrodes 152 are respectively located in different plurality of second regions 100b. The second area 100b is different from the first area 100a. Each second region 100b overlaps with the corresponding at least one pixel electrode 140.

Referring to FIG. 7, in this embodiment, the plurality of first touch electrodes 151 and the plurality of second touch electrodes 152 may be located on the left L and right R of the in-cell touch display panel 100 (or 100A), respectively. The plurality of first touch electrodes 151 can be divided into a plurality of touch electrode groups G1. The plurality of touch electrode groups G1 may be arranged along the first direction x. Each touch electrode group G1 includes a plurality of first touch electrodes 151 sequentially arranged along the first direction x. The lengths of the plurality of first touch electrodes 151 of the same touch electrode group G1 in the second direction y may be sequentially decreased. The plurality of second touch electrodes 152 can be divided into a plurality of touch electrode groups G2. The plurality of touch electrode groups G2 may be arranged along the first direction x. Each touch electrode group G2 includes a plurality of second touch electrodes 152 sequentially arranged along the first direction x. The lengths of the plurality of second touch electrodes 152 of the same touch electrode group G2 in the second direction y may be sequentially decreased. The plurality of first regions 100a where the plurality of end points 151a of the plurality of first touch electrodes 151 of the same touch electrode group G1 can be arranged in a row, and the plurality of second touch electrodes 152 of the same touch electrode group G2 The plurality of second regions 100b where the plurality of endpoints 152a are located may be arranged in a row, and all the endpoints 151a and the first region 100a and the second region 100b where all the endpoints 152a are located may be arranged in an array, but the This is limited. The plurality of first touch electrodes 151 are electrically connected to the detection pad P1. The plurality of second touch electrodes 152 are electrically connected to the detection pad P2. In this embodiment, to simplify the device for detecting the touch electrodes 150, all the first touch electrodes 151 may be electrically connected to the same detection pad P1, and all the second touch electrodes 152 may be electrically connected to the same detection Pad P2. However, the present invention is not limited to this. In other embodiments, the plurality of first touch electrodes 151 may also be electrically connected to different detection pads, and the plurality of second touch electrodes 152 may also be electrically connected to Different multiple detection pads.

FIG. 8 illustrates signals of the touch electrodes of the in-cell touch display panel according to another embodiment of the invention. For example, the signal shown in FIG. 8 can be used to detect the plurality of first touch electrodes 151 and the plurality of second touch electrodes 152 in FIG. 7. The graph at the top of FIG. 8 shows the relationship between time t and voltage V ₁₄₀ , where voltage V _{140 is} used for input to pixel electrode 140 of in-cell display panel 100 (or 100A). The graph in the middle of FIG. 8 shows the relationship between the time t and the voltage V _P1 , where the voltage V _{P1 is} used for input to the detection pad P1 electrically connected to the first touch electrode 151. The bottom graph of FIG. 8 shows the relationship between time t and voltage V _P2 , where voltage V _{P2 is} used for input to detection pad P2 electrically connected to second touch electrode 152. FIG. 9 shows a detection screen of the in-cell display panel 100 (or 100A) corresponding to FIG. 7 within the first time T1. Referring to FIGS. 7, 8 and 9, during the first time T1, let the voltage V ₁₄₀ input to the pixel electrode ₁₄₀ be V, let the voltage V _P1 input to the detection pad _P1 be V1, and let the input to The voltage V _{P2 of the} detection pad P2 is 0, for example. In other words, within the first time T1, there is a first voltage difference V-V1 between the pixel electrode 140 and all the first touch electrodes 151, and between the pixel electrode 140 and all the second touch electrodes 152 The second voltage difference (V-0 = V). The first voltage difference V-V1 corresponds to the first brightness, and the second voltage difference (V-0 = V) corresponds to the second brightness. That is to say, when there is no abnormality in the in-cell display panel 100 (or 100A), the first voltage difference V-V1 can cause the first area 100a where the end point 151a of the first touch electrode 151 to exhibit the first brightness, The second voltage difference (V-0 = V) enables the second area 100b where the endpoint 152a of the second touch electrode 152 is located to exhibit the second brightness.

For example, in this embodiment, the first voltage difference V-V1 may approach or equal to 0, and the second voltage difference may be V greater than 0. When there is no abnormality in the embedded display panel 100 (or 100A), the first voltage difference V-V1 should make all the first regions 100a where the terminal 151a of the first touch electrode 151 appear white, while the second The voltage difference (V-0 = V) should make all the second regions 100b where the end points 152a of the second touch electrodes 152 appear black. Please refer to FIG. 9, however, in this embodiment, within the first time T1, the first region 100a1 does not exhibit the first brightness (white), and the second region 100b1 does not exhibit the second brightness (black). . In other words, the voltage difference between the end point 151a of a certain first touch electrode 151 and the corresponding pixel electrode 140 is not the proper first voltage difference V-V1, but the end point of a certain second touch electrode 152 The voltage difference between 152a and the corresponding pixel electrode 140 is not the second voltage difference (V-0 = V). At this time, it can be determined that the first touch electrode 151 whose end point 151a is located in the first area 100a1 and the second touch electrode 152 whose end point 152a is located in the second area 100b1 are abnormal, for example: The control electrode 151 itself and the second touch electrode 152 are disconnected.

FIG. 10 shows a detection screen of the in-cell display panel 100 (or 100A) corresponding to FIG. 7 within the second time T2. 7, 8, and 10, during the second time T2, the voltage V ₁₄₀ input to the pixel electrode ₁₄₀ is V, the voltage V _P1 input to the detection pad P1 is, for example, 0, and the input The voltage V _P2 to the detection pad _P2 is V2. In other words, during the second time T2, there is a second voltage difference (V-0 = V) between the pixel electrode 140 and all the first touch electrodes 151, and the pixel electrode 140 and all the second touch electrodes There is a first voltage difference V-V2 between 152. The first voltage difference V-V2 corresponds to the first brightness, and the second voltage difference (V-0 = V) corresponds to the second brightness. In other words, the second voltage difference (V-0 = V) can make the first area 100a where the end point 151a of the first touch electrode 151 appear when there is no abnormality in the embedded display panel 100 (or 100A) The second brightness, and the first voltage difference V-V2 enables the second area 100b where the end point 152a of the second touch electrode 152 to present the first brightness.

For example, in this embodiment, the second voltage difference (V-0 = V) may be V greater than 0, and the first voltage difference V-V2 may approach or equal to 0. When there is no abnormality in the in-cell display panel 100 (or 100A), the second voltage difference (V-0 = V) can make all the first regions 100a where the terminal 151a of the first touch electrode 151 appear black, The first voltage difference V-V2 can make all the second regions 100b where the end points 152a of the second touch electrodes 152 appear white. Please refer to FIG. 10, however, in this embodiment, within the second time T2, the first area 100a1 does not exhibit the second brightness (black), and the second area 100b1 does not exhibit the first brightness (white) . The first area 100a1 exhibits a different white color from the other first areas 100a, and the second area 100b1 exhibits a different black color from the other second areas 100a. In other words, the voltage difference between the end point 151a of a certain first touch electrode 151 and the corresponding pixel electrode 140 is not an expected second voltage difference (V-0 = V), and a certain second touch electrode The voltage difference between the end point 152a of 152 and the corresponding pixel electrode 140 is not the first voltage difference V-V2 due to it. At this time, it can be confirmed again that the first touch electrode 151 whose end point 151a is located in the first area 100a1 and the second touch electrode 152 whose end point 152a is located in the second area 100b1 are abnormal. The control electrode 151 itself and the second touch electrode 152 are disconnected.

It should be noted that, in the embodiments of FIGS. 7 to 10, the steps of detecting the first touch electrode 151 and the second touch electrode 152 are performed at the first time T1 and the second time T2 to repeatedly confirm the endpoint One first touch electrode 151 in the first area 100a1 and one second touch electrode 152 in the second area 100b1 are abnormal. However, the present invention is not limited to this. In other embodiments, performing the detection step corresponding to the first time T1 or performing the detection step corresponding to the second time T2 is sufficient to confirm the plurality of first touch electrodes 151 and the plurality of first Whether the two touch electrodes 152 are abnormal. In other words, a detection method including a detection step corresponding to the first time T1 or a detection method including a detection step corresponding to the second time T2 is also within the scope of the present invention. The detection methods of FIGS. 7 to 10 have similar functions and advantages as the detection methods of FIGS. 3 to 6 and will not be repeated here.

FIG. 11 is a schematic top view of a touch electrode according to still another embodiment of the invention. Referring to FIG. 11, the aforementioned touch electrode 150 includes a plurality of first touch electrodes 153, a plurality of second touch electrodes 154, a plurality of third touch electrodes 155, and a plurality of fourth touch electrodes 156. Each first touch electrode 153 has an endpoint 153a. The multiple end points 153a of the multiple first touch electrodes 153 are respectively located in different multiple first regions 100c. Each first region 100c overlaps with the corresponding at least one pixel electrode 140. Each second touch electrode 154 has an endpoint 154a. The plurality of end points 154a of the plurality of second touch electrodes 154 are respectively located in different plurality of second regions 100d. Each second area 100d overlaps at least one pixel electrode 140. The multiple end points 155a of the multiple third touch electrodes 155 are respectively located in different multiple third regions 100e. Each third region 100e overlaps with the corresponding at least one pixel electrode 140. Each fourth touch electrode 156 has an end point 156a. The multiple end points 156a of the multiple fourth touch electrodes 156 are respectively located in different multiple fourth regions 100f. Each fourth area 100f overlaps with the corresponding at least one pixel electrode 140.

In this embodiment, the first touch electrode 153 and the second touch electrode 154 are located on the left L of the in-cell touch panel 100 (or 100A), and the third touch electrode 155 and the fourth touch electrode 156 are located The right side R of the in-cell touch panel 100 (or 100A). The first area 100c where the endpoint 153a of the first touch electrode 153 is located and the second area 100d where the endpoint 154a of the second touch electrode 154 is located in the first direction x and the second direction y intersecting the first direction x Alternately arranged. The plurality of third regions 100e where the plurality of end points 155a of the third touch electrode 155 and the fourth region 100f where the plurality of end points 156a of the fourth touch electrode 156 are located are in the first direction x and the second direction y Alternately arranged. In the embodiment of FIG. 11, the plurality of first touch electrodes 153 can be electrically connected to the same detection pad P1, the plurality of second touch electrodes 154 can be electrically connected to the same detection pad P2, and the plurality of third The touch electrodes 155 may be electrically connected to the same detection pad P3, and the plurality of fourth touch electrodes 156 may be electrically connected to the same detection pad P4. However, the present invention is not limited to this. In other embodiments, the first touch electrode 153, the second touch electrode 154, the third touch electrode 155, and the fourth touch electrode 156 may also be connected to the corresponding The detection pad is described below using FIG. 12 as an example. 12 is a schematic top view of a touch electrode according to another embodiment of the present invention. The touch electrode 150 of FIG. 12 is the same as the touch electrode 150 of FIG. 11 except that the detection pads P13 and P24 of FIG. 12 are the same as the detection of FIG. The pads P1, P2, P3, P4 are different. In the embodiment of FIG. 12, the plurality of first touch electrodes 153 and the third touch electrodes 155 may be electrically connected to the same detection pad P13, and the plurality of second touch electrodes 154 and the plurality of fourth touches The control electrode 156 can be electrically connected to the same detection pad P24.

FIG. 13 illustrates signals of the touch electrodes of the in-cell touch display panel according to an embodiment of the invention. The signal shown in FIG. 13 can be used to detect multiple first touch electrodes 153, multiple second touch electrodes 154, multiple third touch electrodes 155, and multiple fourth touches of FIG. 11 (or FIG. 12) Electrode 156. The graph at the top of FIG. 13 shows the relationship between time t and voltage V ₁₄₀ , where voltage V _{140 is} used for input to pixel electrode 140 of in-cell display panel 100 (or 100A). The graph in the middle of FIG. 13 shows the relationship between time t and voltage V _P13 , where voltage V _{P13 is} used for input to detection pad P1 and detection pad P3 of FIG. 11 (or detection pad P13 of FIG. 12). The bottom graph of FIG. 13 shows the relationship between time t and voltage V _P24 , where voltage V _{P24 is} used for input to detection pad P2 and detection pad P4 of FIG. 11 (or detection pad P24 of FIG. 12). FIG. 14 shows a detection screen of the in-cell display panel 100 (or 100A) corresponding to FIG. 11 (or FIG. 12) within the first time T1. Please refer to FIG. 11 (or FIG. 12), FIG. 13 and FIG. 14, within the first time T1, the voltage V ₁₄₀ input to the pixel electrode ₁₄₀ is V, and the input to the detection pad P1 and the detection pad P3 ( Or the detection pad P13) has a voltage V _P13 of V1, and the voltage V _P24 input to the detection pad P2 and the detection pad P4 (or the detection pad P24) is, for example, 0. In other words, during the first time T1, there is a first voltage difference V-V1 between the pixel electrode 140 and all the first touch electrodes 153, and there is a first voltage difference between the pixel electrode 140 and all the third touch electrodes 155. A voltage difference V-V1, there is a second voltage difference (V-0 = V) between the pixel electrode 140 and all the second touch electrodes 154, and between the pixel electrode 140 and all the fourth touch electrodes 156 There is a second voltage difference (V-0 = V). The first voltage difference V-V1 corresponds to the first brightness, and the second voltage difference (V-0 = V) corresponds to the second brightness. That is, the first voltage difference V-V1 enables the first area 100c where the end point 153a of the first touch electrode 153 is located and the third touch if there is no abnormality in the embedded display panel 100 (or 100A) The third region 100e where the terminal 155a of the electrode 155 is located exhibits the first brightness, and the second voltage difference (V-0 = V) enables the second region 100d and the fourth where the terminal 154a of the second touch electrode 154 is located The fourth area 100f where the endpoint 156a of the touch electrode 156 is located exhibits the second brightness.

For example, in this embodiment, the first voltage difference V-V1 may approach or equal to 0, and the second voltage difference may be V greater than 0. When there is no abnormality in the embedded display panel 100 (or 100A), the first voltage difference V-V1 can enable all the first regions 100c and the third touch electrodes 155 where the endpoint 153a of the first touch electrode 153 is located All the third regions 100e where the terminal 155a is located appear white, and the second voltage difference (V-0 = V) enables all the second regions 100d and the fourth touch where the terminal 154a of the second touch electrode 154 is located All the fourth regions 100f where the endpoint 156a of the electrode 156 is located appear black. In other words, if there is no abnormality in the embedded display panel 100 (or 100A), the embedded display panel 100 (or 100A) should present a black-and-white checkerboard screen.

Please refer to FIG. 14, however, in this embodiment, within the first time T1, the first region 100c1 does not exhibit the first brightness (white), and the fourth region 100f1 does not exhibit the second brightness (black). . In other words, the voltage difference between the end point 153a of a certain first touch electrode 153 and the corresponding pixel electrode 140 is not the proper first voltage difference V-V1, but the end point of a certain fourth touch electrode 156 The voltage difference between 156a and the corresponding pixel electrode 140 is not an expected second voltage difference (V-0 = V). At this time, it can be determined that the first touch electrode 153 whose end point 153a is located in the first area 100c1 and the fourth touch electrode 156 whose end point 156a is located in the fourth area 100f1 are abnormal. For example, during the first time T1, when the adjacent first area 100c1 and the second area 100d1 exhibit the same second brightness (black), it is determined that the endpoint 153a is located in the first touch electrode 153 of the first area 100c1 Short circuit with one of the second touch electrodes 154. During the first time T1, the adjacent third area 100e1 and the fourth area 100f1 exhibit the same first brightness (white), and it is determined that the endpoint 156a is located in the fourth touch electrode 156 of the fourth area 100f1 and one of the first The three touch electrodes 155 are short-circuited.

FIG. 15 shows a detection screen of the in-cell display panel 100 (or 100A) corresponding to FIG. 11 (or FIG. 12) within the second time T2. Referring to FIG. 11 (or FIG. 12), FIG. 13 and FIG. 15, during the second time T2, the voltage V ₁₄₀ input to the pixel electrode ₁₄₀ is V, and the input to the detection pad P1 and the detection pad P3 ( Or the detection pad P13) voltage V _{P13 is,} for example, 0, and the voltage V _P24 input to the detection pad P2 and the detection pad P4 (or the detection pad P24) is V2. In other words, during the second time T2, there is a second voltage difference (V-0 = V) between the pixel electrode 140 and all the first touch electrodes 153, and the pixel electrode 140 and all the third touch electrodes 155 There is a second voltage difference (V-0 = V) between the pixel electrode 140 and all the second touch electrodes 154, there is a first voltage difference V-V2, and the pixel electrode 140 and all the fourth touch There is a first voltage difference V-V2 between the control electrodes 156. The first voltage difference V-V2 corresponds to the first brightness, and the second voltage difference (V-0 = V) corresponds to the second brightness. That is, the first voltage difference V-V2 can enable the first area 100c where the end point 153a of the first touch electrode 153 and the third touch if there is no abnormality in the embedded display panel 100 (or 100A) The third area 100e where the terminal 155a of the electrode 155 is located exhibits the second brightness, and the second voltage difference (V-0 = V) enables the second area 100d and the fourth where the terminal 154a of the second touch electrode 154 is located The fourth area 100f where the endpoint 156a of the touch electrode 156 is located exhibits the first brightness.

For example, in this embodiment, the first voltage difference V-V2 may be V greater than 0, and the second voltage difference (V-0 = V) may approach or equal to 0. When there is no abnormality in the embedded display panel 100 (or 100A), the first voltage difference V-V2 can enable all the first regions 100c and the third touch electrodes 155 where the endpoint 153a of the first touch electrode 153 is located The third region 100e where the terminal 155a is located appears black, and the second voltage difference (V-0 = V) enables all the second regions 100d and the fourth touch electrode where the terminal 154a of the second touch electrode 154 is located All the fourth areas 100f where the endpoint 156a of 156 is located appear white. In other words, if there is no abnormality in the embedded display panel 100 (or 100A), the embedded display panel 100 (or 100A) should present a black-and-white checkerboard screen.

Please refer to FIG. 15, however, in this embodiment, within the second time T2, the first region 100c1 does not exhibit the second brightness (black), and the fourth region 100f1 does not exhibit the first brightness (white). . The first area 100c1 exhibits a different white color from the other first areas 100c, and the fourth area 100f1 exhibits a different black color from the other fourth areas 100f. In other words, the voltage difference between the end point 153a of a certain first touch electrode 153 and the corresponding pixel electrode 140 is not an expected second voltage difference (V-0 = V), and a fourth touch electrode The voltage difference between the end point 156a of 156 and the corresponding pixel electrode 140 is not the proper first voltage difference V-V2. At this time, it can be confirmed again that the first touch electrode 153 where the endpoint 153a is located in the first area 100c1 and the fourth touch electrode 156 where the endpoint 156a is located in the fourth area 100f1 are abnormal. For example, during the second time T2, when the adjacent first area 100c1 and the second area 100d1 exhibit the same first brightness (white), it is determined that the endpoint 153a is located in the first touch electrode 153 of the first area 100c1 Short circuit with one of the second touch electrodes 154. During the second time T2, when the adjacent third area 100e1 and the fourth area 100f1 exhibit the same second brightness (black), it is determined that the endpoint 156a is located in the fourth touch electrode 156 of the fourth area 100f1 and one of the first The three touch electrodes 155 are short-circuited.

It should be noted that in the embodiments of FIGS. 11 to 15, the first touch electrode 153, the second touch electrode 154, the third touch electrode 155, and the first touch electrode 153 are detected at the first time T1 and the second time T2. The steps of the fourth touch electrode 156 are repeated to confirm that a first touch electrode 153 whose end point 153a is located in the first area 100c1 and a fourth touch electrode 156 whose end point 156a is located in the fourth area 100f1 are abnormal. However, the present invention is not limited to this. In other embodiments, performing the detection step corresponding to the first time T1 or performing the detection step corresponding to the second time T2 is sufficient to confirm the plurality of first touch electrodes 153 and the plurality of first Whether the two touch electrodes 154, the plurality of third touch electrodes 155, and the plurality of fourth touch electrodes 156 are abnormal. In other words, a detection method including a detection step corresponding to the first time T1 or a detection method including a detection step corresponding to the second time T2 is also within the scope of the present invention. The detection methods of FIGS. 11 to 15 have similar functions and advantages as the detection methods of FIGS. 3 to 6 and will not be repeated here.

In summary, the detection method according to an embodiment of the present invention includes the following steps: within a first time, a first voltage difference corresponding to a first brightness exists between the pixel electrode and the first touch electrode; at a second time There is a second voltage difference corresponding to the second brightness between the pixel electrode and the first touch electrode; and at least a first area does not exhibit the first brightness during the first time, and at least a first during the second time If an area does not exhibit the second brightness, or at least a first area does not exhibit the first brightness within the first time and at least a first area does not exhibit the second brightness within the second time, it is determined that the endpoint is located in the at least one area A first touch electrode is abnormal. With the above detection method, there is no need to provide a plurality of detection pads corresponding to the plurality of touch electrodes and / or use a complicated circuit detection method to detect the touch electrodes. It can easily and quickly determine whether the touch electrodes of the in-cell touch display panel are abnormal.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

100、100A‧‧‧Embedded touch display panel
100a, 100a1, 100c, 100c1 ‧‧‧ first area
100b, 100b1, 100d‧‧‧Second area
100e‧‧‧third area
100f, 100f1 ‧‧‧ fourth area
110‧‧‧The first substrate
120‧‧‧Second substrate
130‧‧‧Display medium
140‧‧‧ pixel electrode
150‧‧‧Touch electrode
151, 153‧‧‧ First touch electrode
151a, 152a, 153a, 154a, 155a, 156a‧‧‧ endpoint
152、154‧‧‧Second touch electrode
155‧‧‧The third touch electrode
156‧‧‧Fourth touch electrode
160‧‧‧Insulation
160a‧‧‧contact hole
170‧‧‧Active components
G, G1, G2‧‧‧Touch electrode group
L‧‧‧left
P, P1, P2, P3, P4, P13, P24‧‧‧‧ detection pad
R‧‧‧right
t‧‧‧time
T1‧‧‧First time
T2‧‧‧Second time
V ₁₄₀ , V _P , V _P1 , V _P2 , V _P13 , V _P24 , V, V1, V2‧‧‧ Voltage
x‧‧‧First direction
y‧‧‧Second direction

FIG. 1 is a schematic cross-sectional view of an in-cell touch display panel according to an embodiment of the invention. 2 is a schematic cross-sectional view of an in-cell touch display panel according to another embodiment of the invention. FIG. 3 is a schematic top view of a touch electrode according to an embodiment of the invention. FIG. 4 illustrates the signals of the touch electrodes of the in-cell touch display panel according to an embodiment of the invention. FIG. 5 shows a detection screen of the embedded display panel corresponding to FIG. 3 in the first time. FIG. 6 shows a detection screen of the embedded display panel corresponding to FIG. 3 in the second time. 7 is a schematic top view of a touch electrode according to another embodiment of the invention. FIG. 8 illustrates signals of the touch electrodes of the in-cell touch display panel according to another embodiment of the invention. FIG. 9 shows a detection screen of the embedded display panel corresponding to FIG. 7 in the first time. FIG. 10 shows a detection screen of the embedded display panel corresponding to FIG. 7 in the second time. FIG. 11 is a schematic top view of a touch electrode according to still another embodiment of the invention. 12 is a schematic top view of a touch electrode according to another embodiment of the invention. FIG. 13 illustrates signals of the touch electrodes of the in-cell touch display panel according to an embodiment of the invention. FIG. 14 shows a detection screen of the embedded display panel corresponding to FIG. 11 (or FIG. 12) in the first time. FIG. 15 shows a detection screen of the embedded display panel corresponding to FIG. 11 (or FIG. 12) in the second time.

100a, 100a1‧‧‧The first area

151‧‧‧First touch electrode

151a‧‧‧Endpoint

G‧‧‧Touch electrode group

P‧‧‧Test pad

x‧‧‧First direction

y‧‧‧Second direction

Claims (10)

A detection method for detecting an in-cell touch display panel having a plurality of pixel electrodes and a plurality of first touch electrodes, each of the first touch electrodes having an end Point, the end points of the first touch electrodes are respectively located in different first regions, and the detection method includes: enabling the pixel electrodes and the first touch electrodes within a first time There is a first voltage difference corresponding to a first brightness between them; within a second time, there is a second voltage difference corresponding to a second brightness between the pixel electrodes and the first touch electrodes ; And a first area does not exhibit the first brightness during the first time, the first area does not exhibit the second brightness during the second time, or a first area does not exhibit during the first time When the first brightness is present and the first area does not exhibit the second brightness within the second time, it is determined that a first touch electrode whose endpoint is located in the first area is abnormal. The detection method as described in item 1 of the patent application range, wherein the in-cell touch display panel further has a plurality of second touch electrodes, each of the second touch electrodes has an endpoint, and the second touch The plurality of endpoints of the control electrode are respectively located in a plurality of second areas different from the first areas, and the detection method further includes: enabling the pixel electrodes and the second touches within the first time The second voltage difference corresponding to the second brightness exists between the electrodes; during the second time, the first voltage corresponding to the first brightness exists between the pixel electrodes and the second touch electrodes difference. The detection method as described in item 2 of the patent application scope, wherein a second area does not exhibit the second brightness during the first time, and the second area does not exhibit the first brightness during the second time, or If the second area does not exhibit the second brightness during the first time and the second area does not exhibit the first brightness during the second time, it is determined that the end point is located at a second touch of the second area The control electrode is abnormal. The detection method as described in item 3 of the patent application scope, wherein the first regions where the endpoints of the first touch electrodes are located are arranged in an array and are located on the left side of the embedded touch panel, and The second regions where the endpoints of the second touch electrodes are located are arranged in an array and are located on the right side of the embedded touch panel. The detection method as described in item 4 of the patent application scope, wherein during the first time a first area exhibits the second brightness different from the other first areas, and within the second time the first A region exhibiting the first brightness different from the other first regions, it is determined that a first touch electrode whose endpoint is located in the first region is open; a second region appears within the first time The first brightness that is different from the other second areas, the second area exhibits the second brightness that is different from the other second areas during the second time, and it is determined that the endpoint is located in the second area One of the second touch electrodes is broken. The detection method as described in item 2 of the patent application scope, wherein the first regions where the endpoints of the first touch electrodes are located and the endpoints where the endpoints of the second touch electrodes are located The second regions are alternately arranged in a first direction and a second direction interlaced with the first direction. The detection method as described in item 6 of the patent application range, wherein a first area adjacent to the first area and a second area exhibit the same second brightness during the first time When the adjacent first area and the second area exhibit the same first brightness, it is determined that a first touch electrode whose endpoint is located in the first area is short-circuited with one of the second touch electrodes. The detection method as described in item 7 of the patent application range, wherein the in-cell touch display panel further has a plurality of third touch electrodes and a plurality of fourth touch electrodes, the first touch electrodes and the The second touch electrodes are located on the left side of the embedded touch panel, the third touch electrodes and the fourth touch electrodes are located on the right side of the embedded touch panel, and the third touch electrodes The third regions where the plurality of endpoints are located and the fourth regions where the plurality of endpoints of the fourth touch electrodes are located are alternately arranged in the first direction and the second direction. The detection method as described in item 8 of the patent application scope, wherein, within the first time, the first voltage difference corresponding to the first brightness exists between the pixel electrodes and the third touch electrodes , And the second voltage difference corresponding to the second brightness exists between the pixel electrodes and the fourth touch electrodes; during the second time, the pixel electrodes and the third touch The second voltage difference corresponding to the second brightness exists between the control electrodes, and the first voltage difference corresponding to the first brightness exists between the pixel electrodes and the fourth touch electrodes. The detection method as described in item 9 of the patent application range, wherein a third area and a fourth area adjacent in the first time exhibit the same first brightness and are adjacent in the second time The third area and the fourth area exhibit the same second brightness, and it is determined that a fourth touch electrode whose endpoint is located in the fourth area is short-circuited with one of the third touch electrodes.