Electronic paper display device and impedance measuring method thereof

Abstract

The invention discloses an electronic paper display device and an impedance measuring method thereof. The impedance measurement method comprises the following steps: cutting off a first wire between a driving chip and an electrical connection point, so that the driving chip and a first conductive piece cannot be electrically connected through the first wire; cutting off the third wire between the first conductive part and the second conductive part, so that the first conductive part and the second conductive part cannot be electrically connected through the third wire; and measuring an impedance between the first measurement pad and the second measurement pad; wherein when the impedance is less than 1 kilohm, the impedance of the loop transmitting the common voltage is within a normal range; and when the impedance is greater than or equal to 1k omega, the impedance of the loop transmitting the common voltage is abnormal.

Description

Technical Field

[0001] This invention relates to a display device and its measurement method, and particularly to an electronic paper display device and its impedance measurement method, which can determine whether the impedance of a circuit transmitting a common voltage is abnormal. Background Technology

[0002] In existing technologies, both liquid crystal displays (LCDs) and light-emitting diode (LED) displays still suffer from the drawback of requiring a continuous power supply. This means that while displaying an image, the device continues to consume power. Therefore, bistable electronic paper displays were developed to address this need. When a bistable electronic paper display shows an image or screen, no additional power is required; the image or screen is continuously retained. Additional power is only needed when changing to another state or displaying a different image. This low power consumption and memory capability have made it one of the preferred choices for next-generation display devices.

[0003] In the manufacturing process of existing electronic paper display devices, conductive adhesive is first applied to the driving substrate, and the holes of the electronic paper film located on the outside of the display area are aligned with the conductive adhesive so that the electronic paper film is attached to the driving substrate. The driving substrate can then transmit a common voltage to the common electrode layer of the electronic paper film through the conductive adhesive in the holes, thereby generating a voltage across the display medium of the electronic paper film.

[0004] However, when an electronic paper display device malfunctions, there is currently no method to accurately determine whether the impedance of the common voltage transmission loop is abnormal without damaging the normal display. Therefore, it is impossible to know whether the display malfunction is caused by an excessive voltage drop in the common voltage. Summary of the Invention

[0005] The purpose of this invention is to provide an electronic paper display device and its impedance measurement method, which can accurately determine whether the impedance of the circuit transmitting the common voltage is abnormal, thereby determining whether the display abnormality is caused by too large a voltage drop of the common voltage.

[0006] To achieve the above objectives, an electronic paper display device according to the present invention includes a driving substrate, an electronic paper film, a first conductive element, a second conductive element, a driving chip, and a connecting circuit board. The driving substrate includes a first wire, a second wire, and a third wire for transmitting a common voltage. The electronic paper film is disposed on the driving substrate and includes a common electrode layer and a display medium layer located between the common electrode layer and the driving substrate. The first wire, the second wire, and the third wire are located outside the display area of ​​the electronic paper film, and the display medium layer has a first through-hole and a second through-hole. The first conductive element and the second conductive element are correspondingly disposed in the first through-hole and the second through-hole, respectively, and are connected to the common electrode layer. The first conductive element is connected to the second conductive element via the third wire. The driving chip is disposed on the driving substrate and electrically connected to the electronic paper film. The driving chip is electrically connected to the first conductive element via the first wire and to the second conductive element via the second wire. The circuit board is electrically connected to the driver chip and has a first measuring pad and a second measuring pad. The first measuring pad is electrically connected to a first wire and has an electrical connection point. The first measuring pad is electrically connected to a common electrode layer via the electrical connection point, the first wire, and the first conductive element. The second measuring pad is electrically connected to the driver chip and is electrically connected to the common electrode layer via the driver chip, the second wire, and the second conductive element.

[0007] In one embodiment, the first wire and the second wire are located on opposite sides of the driver chip.

[0008] In one embodiment, the first through hole and the second through hole are located outside the display area.

[0009] In one embodiment, the electrical connection point is located between the driver chip and the first conductive element.

[0010] In one embodiment, the driver chip generates a common voltage, which is transmitted to a common electrode layer via a first wire and a first conductive element, or via a second wire and a second conductive element.

[0011] In one embodiment, the first wire between the driver chip and the electrical connection point has a first cut, which prevents the driver chip from being electrically connected to the first conductive element via the first wire.

[0012] In one embodiment, the third wire between the first conductive element and the second conductive element has a second cut, which prevents the first conductive element and the second conductive element from being electrically connected through the third wire.

[0013] In one embodiment, the electronic paper display device further includes a system circuit board, which is electrically connected to the driving substrate and the driving chip via a connection circuit board.

[0014] To achieve the above objectives, an impedance measurement method for an electronic paper display device according to the present invention is provided. The electronic paper display device includes a driving substrate, an electronic paper film, a first conductive element, a second conductive element, a driving chip, and a connecting circuit board. The driving substrate includes a first wire, a second wire, and a third wire for transmitting a common voltage. The electronic paper film is disposed on the driving substrate and includes a common electrode layer and a display medium layer located between the common electrode layer and the driving substrate. The first wire, the second wire, and the third wire are located around the display area of ​​the electronic paper film. The display medium layer has a first through-hole and a second through-hole. The first conductive element and the second conductive element are correspondingly disposed in the first through-hole and the second through-hole, and respectively connected to the common electrode layer. The first conductive element is connected to the second conductive element via the third wire. The driving chip is disposed on the driving substrate and electrically connected to the electronic paper film. The driving chip is electrically connected to the first conductive element via the first wire and to the second conductive element via the second wire. The circuit board is electrically connected to the driver chip and has a first measuring pad and a second measuring pad. The first measuring pad is electrically connected to a first wire to have an electrical connection point. The first measuring pad is electrically connected to a common electrode layer via the electrical connection point, the first wire, and a first conductive element. The second measuring pad is electrically connected to the driver chip and is electrically connected to the common electrode layer via the driver chip, a second wire, and a second conductive element. The impedance measurement method includes: cutting the first wire located between the driver chip and the electrical connection point, so that the driver chip and the first conductive element cannot be electrically connected through the first wire; cutting the third wire located between the first conductive element and the second conductive element, so that the first conductive element and the second conductive element cannot be electrically connected through the third wire; and measuring the impedance between the first measuring pad and the second measuring pad. Wherein, when the impedance is less than 1kΩ, the impedance of the loop transmitting the common voltage is within the normal range; when the impedance is greater than or equal to 1kΩ, the impedance of the loop transmitting the common voltage is abnormal.

[0015] In one embodiment, the electrical connection point is located between the driver chip and the first conductive element.

[0016] As described above, in the impedance measurement method of the electronic paper display device of the present invention, the first wire located between the driver chip and the electrical connection point is cut off, preventing the driver chip and the first conductive element from being electrically connected through the first wire; the third wire located between the first conductive element and the second conductive element is cut off, preventing the first conductive element and the second conductive element from being electrically connected through the third wire; and the impedance between the first measuring pad and the second measuring pad is measured. Wherein, when the impedance is less than 1kΩ, the impedance of the common voltage transmission loop is within the normal range; when the impedance is greater than or equal to 1kΩ, the impedance of the common voltage transmission loop is abnormal. These technical means enable the electronic paper display device and its impedance measurement method of the present invention to accurately determine whether the impedance of the common voltage transmission loop is abnormal, thereby determining whether the display abnormality is caused by a large voltage drop due to the common voltage. Attached Figure Description

[0017] Figure 1A This is a schematic diagram of an electronic paper display device according to an embodiment of the present invention.

[0018] Figure 1B and Figure 1C They are respectively Figure 1A Schematic diagrams of different cross-sections along the sectional line AA of an electronic paper display device.

[0019] Figure 2 This is another schematic diagram of the electronic paper display device of the present invention.

[0020] Figure 3 This is a flowchart illustrating the steps of an impedance measurement method for an electronic paper display device according to an embodiment of the present invention. Detailed Implementation

[0021] The following description, with reference to the accompanying drawings, will illustrate an electronic paper display device and its impedance measurement method according to a preferred embodiment of the present invention, wherein the same elements will be described using the same reference numerals.

[0022] Figure 1A This is a schematic diagram of an electronic paper display device according to an embodiment of the present invention. Figure 1B and Figure 1C They are respectively Figure 1A Schematic diagrams of different cross-sections of an electronic paper display device along the sectional line AA. Figure 2 This is another schematic diagram of the electronic paper display device of the present invention, and Figure 3 This is a flowchart illustrating the steps of an impedance measurement method for an electronic paper display device according to an embodiment of the present invention.

[0023] Please refer to this first. Figure 1A and Figure 1B The electronic paper display device 1 of this embodiment includes a driving substrate 11, an electronic paper film 12, a first conductive element 13a, a second conductive element 13b, a driving chip 14, and a connecting circuit board 15. Additionally, the electronic paper display device 1 of this embodiment also includes a system circuit board 16.

[0024] The driving substrate 11 is electrically connected to the electronic paper film 12 and can drive the electronic paper film 12 to display images. In this embodiment, the driving substrate 11 includes a first wire L1, a second wire L2, and a third wire L3. The first wire L1, the second wire L2, and the third wire L3 can at least be used to transmit a common voltage (Vcom) to the driving circuit (e.g., including a TFT) located on the driving substrate 11.

[0025] In one embodiment, the driving substrate 11 may include multiple scan lines and multiple data lines, which are disposed on a substrate and are interleaved to define multiple pixels. Each pixel may have at least one switch, such as a thin-film transistor (TFT), making the driving substrate 11 an active matrix driven TFT substrate, thereby controlling whether an electric field is formed in each pixel. The substrate of the driving substrate 11 may vary in shape depending on product requirements and may be a glass substrate, a plastic substrate, or a flexible substrate, without limitation. The material of the flexible substrate is, for example, but not limited to, polyimide (PI).

[0026] An electronic paper film 12 is disposed on a driving substrate 11. In this embodiment, the electronic paper film 12 has a display area DA for displaying images. In the normal direction of the driving substrate 11, a first conductor L1, a second conductor L2, and a third conductor L3 are located outside the display area DA, and the first conductor L1 and the second conductor L2 are located on opposite sides of the driving chip 14. Additionally, the driving substrate 11 in this embodiment also includes a fourth conductor L4, with both ends of the fourth conductor L4 connected to the third conductor L3. In the normal direction of the driving substrate 11, the fourth conductor L4 is located between the driving chip 14 and the display area DA, and the third conductor L3 and the fourth conductor L4 surround the periphery of the display area DA. Here, the fourth conductor L4 can at least transmit a common voltage (Vcom) to the driving circuit (e.g., including a TFT) located on the driving substrate 11.

[0027] The electronic paper film 12 is a bistable display element, thus possessing advantages such as power saving and wide viewing angle. It can be a microcapsule-type electronic paper, a microcup-type electronic paper, or a cholesterol liquid crystal electronic paper, but is not limited to these. When the electronic paper film 12 is a microcapsule-type or microcup-type electronic paper, its display medium can be an electrophoretic material containing multiple charged light-colored pigment particles and a dark-colored medium solution. The pigment particles and the medium solution are respectively contained within multiple microcapsules, and the microcapsules can be bonded together using an adhesive. Alternatively, the contents of the electrophoretic material can be a combination of dark-colored pigment particles and a light-colored medium solution; or the contents of the electrophoretic material can be a combination of pigment particles of multiple colors and a light-colored medium solution. This invention is not limited in these respects. Furthermore, when the electronic paper film 12 is a cholesterol liquid crystal electronic paper, its display medium can be cholesterol liquid crystal molecules. The electronic paper film 12 in this embodiment is an example of a microcapsule-type or microcup-type electronic paper.

[0028] like Figure 1BAs shown, the electronic paper film 12 of this embodiment includes a common electrode layer 121, a display medium layer 122, a light-transmitting substrate 123, and an adhesive layer 124. The light-transmitting substrate 123 is disposed opposite to the driving substrate 11. The light-transmitting substrate 123 may be a plastic substrate, and its material may be, for example, but not limited to, polyester (PET). The common electrode layer 121 is disposed on the side of the light-transmitting substrate 123 facing the driving substrate 11, and the display medium layer 122 is disposed between the common electrode layer 121 and the driving substrate 11. The adhesive layer 124 is disposed between the display medium layer 122 and the driving substrate 11. The electronic paper film 12 can be bonded to the upper surface of the driving substrate 11 using the adhesive layer 124. The adhesive layer 124 may be an electronic ink adhesive layer, and its material may be, for example, but not limited to, a thermosetting adhesive.

[0029] In this embodiment, the display medium layer 122 has a first through-hole h1 and a second through-hole h2. The first through-hole h1 and the second through-hole h2 are located outside the display area DA of the electronic paper film 12 and on opposite sides of the driving chip 14. The adhesive layer 124 has another through-hole corresponding to the through-holes (h1 and h2). Here, the common electrode layer 121 is formed entirely on the surface of the light-transmitting substrate 123 facing the display medium layer 122, so as to form an electric field together with the pixel electrodes of each pixel of the driving substrate 11 to control the operation of the display medium corresponding to each pixel, so that the electronic paper film 12 can form an image.

[0030] To enable the driver chip 14 to transmit a common voltage to the common electrode layer 121, in this embodiment, the first conductive element 13a and the second conductive element 13b are correspondingly disposed in the first through-hole h1 and the second through-hole h2, respectively, and the first conductive element 13a is electrically connected to the second conductive element 13b via the third wire L3. Furthermore, the first conductive element 13a and the second conductive element 13b are respectively in contact with and connected to the common electrode layer 121, so that the driver substrate 11 can be electrically connected to the common electrode layer 121 through the first conductive element 13a and the second conductive element 13b. It is understood that the number of through-holes is not limited to two; in different embodiments, the number of through-holes can be greater than two. The materials of the first conductive element 13a and the second conductive element 13b can include, for example, silver paste, solder paste, or anisotropic conductive film (ACF), or combinations thereof.

[0031] In this embodiment, the first conductive element 13a and the second conductive element 13b fill the first through hole h1 and the second through hole h2, respectively. However, this is not a limitation. In different embodiments, the first conductive element 13a and the second conductive element 13b may not fill the first through hole h1 and the second through hole h2 and may not contact their sidewalls. Additionally, as... Figure 1CAs shown, in another embodiment, in addition to the first conductive element 13a and the second conductive element 13b, at least one spacer 17 covered by the first conductive element 13a and the second conductive element 13b can be respectively provided in the first through hole h1 and the second through hole h2. The two ends of the spacer 17 contact (abut) the driving substrate 11 and the common electrode layer 121 respectively. By providing the spacer 17, during the lamination process of the electronic paper display device, when the roller passes over the first through hole h1 and the second through hole h2, the light-transmitting substrate 123 and the common electrode layer 121 above the first through hole h1 and the second through hole h2 are less likely to be recessed. This avoids the first conductive element 13a and the second conductive element 13b from deforming, which would increase the impedance and cause display abnormalities due to the voltage drop of the common voltage. The material of the spacer 17 can include metallic or non-metallic materials. Non-metallic materials are not limited to, but are not limited to, photosensitive photoresist materials such as resins, silicates, or glass fibers. In one embodiment, the spacer 17 may be made of the same material as the spacer disposed between the thin-film transistor substrate (TFT substrate) and the color filter substrate (CF substrate) in a liquid crystal display panel.

[0032] A driver chip 14 is disposed on a driver substrate 11 and electrically connected to an electronic paper film 12. Here, the driver chip 14 can be electrically connected to a first conductive element 13a via a first wire L1 located on the upper side, and to a second conductive element 13b via a second wire L2 located on the lower side. Therefore, when the driver chip 14 generates a common voltage, the common voltage can be transmitted to the common electrode layer 121 of the electronic paper film 12 via the first wire L1 and the first conductive element 13a, or the common voltage can be transmitted to the common electrode layer 121 via the second wire L2 and the second conductive element 13b. In one embodiment, the driver chip 14 may include a scan driver circuit and / or a data driver circuit for driving the electronic paper film 12. In other words, the driver chip 14 may have a scan line driving function or a data line driving function; or, simultaneously (integrated) both scan line driving and data line driving functions. The driver chip 14 in this embodiment is an example with both scan line driving and data line driving functions.

[0033] The connecting circuit board 15 is electrically connected to the driver chip 14. In this embodiment, the connecting circuit board 15 is, for example, but not limited to, a flexible circuit board (FPC), and the driver substrate 11 (driver chip 14) and the system circuit board 16 are respectively connected to the opposite side of the connecting circuit board 15 and are respectively electrically connected to the connecting circuit board 15.

[0034] The system circuit board 16 is connected to the driver substrate 11 via the connection circuit board 15. Therefore, the system circuit board 16 can be electrically connected to the driver substrate 11 and the driver chip 14 through the connection circuit board 15, thereby providing drive signals to be transmitted to the driver substrate 11 and the driver chip 14, thereby controlling the electronic paper film 12 to display images. The system circuit board 16 can be, for example, a printed circuit board (PCB).

[0035] Therefore, when the system circuit board 16 transmits a drive signal to the driver chip 14 via the connection circuit board 15, the scan driver of the driver chip 14 can sequentially turn on the scan lines. The data driver of the driver chip 14 can then transmit the data voltage signal corresponding to each column of pixels to the pixel electrode of each pixel via the data line. This allows an electric field to be formed between the pixel electrode of each pixel and the common electrode layer 121 of the electronic paper film 12, enabling the charged pigment particles within the electrophoretic material to move in the dielectric solution. When external light passes through the light-transmitting substrate 123 and enters the electronic paper film 12, it is reflected by the charged pigment particles, allowing the human eye to see the reflected light from the charged pigment particles against the background of the dielectric solution, thereby forming a display image.

[0036] The connection circuit board 15 in this embodiment has a first measuring pad P1 and a second measuring pad P2. The first measuring pad P1 is electrically connected to the first wire L1 via a fifth wire L5, thus having an electrical connection point P. Here, the electrical connection point P is located between the driver chip 14 and the first conductive element 13a. Therefore, the first measuring pad P1 can be electrically connected to the common electrode layer 121 via the fifth wire L5, the electrical connection point P, the first wire L1, and the first conductive element 13a, while the second measuring pad P2 is electrically connected to the driver chip 14 and can be electrically connected to the common electrode layer 121 via the driver chip 14, the second wire L2, and the second conductive element 13b.

[0037] It should be noted that existing electronic paper display devices on the market do not have a dedicated first measuring pad P1 that can be electrically connected to the common electrode layer 121 via the fifth conductor L5, the first conductor L1, the first conductive element 13a, or a second measuring pad P2 that can be electrically connected to the common electrode layer 121 via the driver chip 14, the second conductor L2, the second conductive element 13b. However, the electronic paper display device 1 of this embodiment specifically provides a first measuring pad P1 and a second measuring pad P2 on the connecting circuit board 15 for the purpose of subsequent common voltage loop impedance measurement. Specifically, when the electronic paper display device 1 experiences a display malfunction, the tester can directly measure the impedance between the first measuring pad P1 and the second measuring pad P2 on the connecting circuit board 15 with a multimeter to determine whether the common voltage loop impedance is abnormal, thereby determining whether the malfunction is caused by an excessive voltage drop in the common voltage.

[0038] Please refer to Figure 2 and Figure 3 This paper describes the impedance measurement method of the electronic paper display device 1 of the present invention. The impedance measurement method of the electronic paper display device 1 in this embodiment may include at least steps S01 to S03.

[0039] First, such as Figure 3 As shown, step S01 is performed: the first wire L1 located between the driver chip 14 and the electrical connection point P is cut off, so that the driver chip 14 and the first conductive element 13a cannot be electrically connected through the first wire L1. Figure 2 As shown, after step S01, the first wire L1 between the driving chip 14 and the electrical connection point P has a first cut (first cutting point C1), which electrically separates the driving chip 14 from the first conductive element 13a.

[0040] Next, step S02 is performed: the third wire L3 located between the first conductive member 13a and the second conductive member 13b is cut, preventing the first conductive member 13a and the second conductive member 13b from being electrically connected through the third wire L3. Therefore, after step S02, the third wire L3 between the first conductive member 13a and the second conductive member 13b has a second cut (second cutting point C2), which electrically separates the first conductive member 13a and the second conductive member 13b. In this embodiment, the second cut (second cutting point C2) is located above the first through hole h1. Here, steps S01 and S02 can be reversed, and the order is not limited.

[0041] It is worth noting that although the first conductor L1 of the electronic paper display device 1 in this embodiment includes a first cut-off point C1 and the third conductor L3 includes a second cut-off point C2, these two cut-off points will not affect the normal display function of the electronic paper display device 1. This is because the common voltage can still be transmitted to the common electrode layer 121 of the electronic paper film 12 via the second conductor L2 and the second conductive element 13b, and then form a circuit with the driving chip 14 via the first conductive element 13a, the first conductor L1, the fifth conductor L5, and the common voltage can also be transmitted to the driving circuit (including TFT) of the driving substrate 11 via the third conductor L3 and the fourth conductor L4.

[0042] Finally, step S03 is performed: measuring the impedance between the first measuring pad P1 and the second measuring pad P2. Specifically, since the first conductor L1 has a first cut-off point C1 and the third conductor L3 has a second cut-off point C2, the impedance abnormality caused by the driving circuit (TFT) on the driving substrate 11 has been eliminated. The first measuring pad P1, the fifth conductor L5, the electrical connection point P and the first conductive element 13a can form a loop, and the first conductor L1, the first conductive element 13a, the common electrode layer 121, the second conductive element 13b, the second conductor L2 and the second measuring pad P2 can form a loop. Measuring the impedance of this loop is equivalent to measuring the loop impedance that transmits the common voltage to the electronic paper film 12. It mainly includes the impedance of the first conductive element 13a and the second conductive element 13b, the impedance of the common electrode layer 121 and the impedance of the conductors connecting these components.

[0043] Therefore, as Figure 3 As shown, when the measured impedance is less than 1kΩ, the impedance of the common voltage transmission loop is within the normal range; when the measured impedance is greater than or equal to 1kΩ, the impedance of the common voltage transmission loop is abnormal (the abnormality may be caused by any component or wire in this loop). Therefore, when the electronic paper display device 1 experiences a display abnormality, the impedance measurement method of this embodiment can accurately determine whether the impedance of the common voltage transmission loop is abnormal by measuring the impedance between the first measuring pad P1 and the second measuring pad P2, thereby determining whether the abnormality is caused by an excessive voltage drop in the common voltage.

[0044] In summary, the impedance measurement method of the electronic paper display device of the present invention involves cutting the first wire located between the driver chip and the electrical connection point, preventing the driver chip and the first conductive element from being electrically connected through the first wire; cutting the third wire located between the first conductive element and the second conductive element, preventing the first conductive element and the second conductive element from being electrically connected through the third wire; and measuring the impedance between the first measuring pad and the second measuring pad. Specifically, when the impedance is less than 1kΩ, the impedance of the common voltage transmission loop is within the normal range; when the impedance is greater than or equal to 1kΩ, the impedance of the common voltage transmission loop is abnormal. These technical means enable the electronic paper display device and its impedance measurement method of the present invention to accurately determine whether the impedance of the common voltage transmission loop is abnormal, thereby determining whether the display abnormality is caused by an excessive voltage drop due to the common voltage.

[0045] The above description is illustrative only and not restrictive. Any equivalent modifications or alterations made without departing from the spirit and scope of this invention should be included within the scope of the appended claims.

Claims

1. An electronic paper display device, comprising: The driving substrate includes a first wire, a second wire, and a third wire for transmitting a common voltage; An electronic paper film is disposed on the driving substrate and includes a common electrode layer and a display medium layer located between the common electrode layer and the driving substrate, wherein the first wire, the second wire and the third wire are located outside the display area of ​​the electronic paper film, and the display medium layer has a first through hole and a second through hole; A first conductive element and a second conductive element are respectively disposed in the first through hole and the second through hole, and are respectively connected to the common electrode layer, wherein the first conductive element is connected to the second conductive element via the third wire; A driver chip is disposed on the driver substrate and electrically connected to the electronic paper film. The driver chip is electrically connected to the first conductive element via the first wire and to the second conductive element via the second wire. as well as The circuit board is electrically connected to the driver chip and has a first measuring pad and a second measuring pad. The first measuring pad is electrically connected to the first wire and has an electrical connection point. The first measuring pad is electrically connected to the common electrode layer via the electrical connection point, the first wire, and the first conductive element. The second measuring pad is electrically connected to the driver chip and is electrically connected to the common electrode layer via the driver chip, the second wire, and the second conductive element.

2. The electronic paper display device as claimed in claim 1, wherein the first wire and the second wire are located on opposite sides of the driver chip.

3. The electronic paper display device as claimed in claim 1, wherein the first through hole and the second through hole are located outside the display area.

4. The electronic paper display device as claimed in claim 1, wherein the electrical connection point is located between the driver chip and the first conductive element.

5. The electronic paper display device of claim 1, wherein the driving chip generates the common voltage, the common voltage being transmitted to the common electrode layer via the first wire and the first conductive element, or via the second wire and the second conductive element.

6. The electronic paper display device of claim 1, wherein the first wire between the driving chip and the electrical connection point has a first cut, the first cut preventing the driving chip and the first conductive element from being electrically connected through the first wire.

7. The electronic paper display device of claim 6, wherein the third wire between the first conductive element and the second conductive element has a second cut, the second cut preventing the first conductive element and the second conductive element from being electrically connected through the third wire.

8. The electronic paper display device as claimed in claim 1, further comprising: The system circuit board is electrically connected to the driving substrate and the driving chip via the connecting circuit board.

9. An impedance measurement method for an electronic paper display device, wherein the electronic paper display device includes a driving substrate, an electronic paper film, a first conductive element, a second conductive element, a driving chip, and a connecting circuit board, the driving substrate includes a first wire, a second wire, and a third wire for transmitting a common voltage, the electronic paper film is disposed on the driving substrate and includes a common electrode layer and a display medium layer located between the common electrode layer and the driving substrate, wherein the first wire, the second wire, and the third wire are located around the display area of ​​the electronic paper film, and the display medium layer has a first through hole and a second through hole, the first conductive element and the second conductive element are correspondingly disposed in the first through hole and the second through hole, and are respectively connected to the common electrode layer, wherein the first conductive element is connected via a first conductive element, the second conductive element, the third conductive element, and the first conductive element are connected via a first conductive element, the second conductive element, the third conductive element, and the first conductive element are connected via a first conductive element, the second conductive element, the third conductive element, and the first conductive element are connected via a second conductive element, the second conductive element, the third conductive element, and the first conductive element are connected via a third conductive element, the second conductive element, the third conductive element, and the third conductive element are connected via a third conductive element, the second conductive element, the third conductive element, the fourth conductive element, the fifth conductive element, the third conductive element, the fourth conductive element, the fifth conductive element, the sixth conductive element, the third ... sixth conductive element, the third conductive element, the fifth conductive element, the sixth conductive element, the sixth conductive element, the sixth conductive element The third conductor is connected to the second conductive element. The driving chip is disposed on the driving substrate and electrically connected to the electronic paper film. The driving chip is electrically connected to the first conductive element via the first conductor and to the second conductive element via the second conductor. The connecting circuit board is electrically connected to the driving chip and has a first measuring pad and a second measuring pad. The first measuring pad is electrically connected to the first conductor and has an electrical connection point. The first measuring pad is electrically connected to the common electrode layer via the electrical connection point, the first conductor, and the first conductive element. The second measuring pad is electrically connected to the driving chip and is electrically connected to the common electrode layer via the driving chip, the second conductor, and the second conductive element. The impedance measurement method includes: Cut the first wire located between the driver chip and the electrical connection point, so that the driver chip and the first conductive component cannot be electrically connected through the first wire; Cut off the third wire located between the first conductive element and the second conductive element, so that the first conductive element and the second conductive element cannot be electrically connected through the third wire; as well as Measure the impedance between the first measuring pad and the second measuring pad; Specifically, when the impedance is less than 1kΩ, the impedance of the circuit transmitting the common voltage is within the normal range; when the impedance is greater than or equal to 1kΩ, the impedance of the circuit transmitting the common voltage is abnormal.

10. The impedance measurement method of claim 9, wherein the electrical connection point is located between the driver chip and the first conductive element.

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