ARRAY SUBSTRATE AND FANOUT LINE STRUCTURE OF THE ARRAY SUBSTRATE

A fanout line structure of an array substrate includes a plurality of fanout lines arranged on a fanout area of the array substrate, where the fanout line is used to connect a signal line with a bonding pad. Lengths of different fanout lines are different. At least one fanout line includes a first subsection and a second subsection. An electrical resistivity of material of the second subsection of the fanout line is greater than an electrical resistivity of material of the first subsection of the fanout line. Length of a first fanout line is greater than length of a second fanout line, and length of a second subsection of the second fanout line is greater than length of a second subsection of the first fanout line.

DETAILED DESCRIPTION

The present disclosure will further be described in detail in accordance with the figures and the exemplary examples.

As shown inFIG. 4, the present disclosure provides a first example of a fanout line structure of an array substrate. A fanout line is used to connect a signal line and a bonding pad. The fanout line structure comprises a plurality of fanout lines arranged on a fanout area of the array substrate, and lengths of the plurality of fanout lines are different. At least one fanout line comprises a first subsection and a second subsection, where an electrical resistivity of material of the second subsection is greater than an electrical resistivity of material of the first subsection. Length of a first fanout line is greater than length of a second fanout line, and length of a second subsection of the second fanout line is greater than length of a second subsection of the first fanout line. The lengths of the first subsection and the second subsection of the fanout line are calculated according to an impedance difference between the fanout line and other fanout lines. A second subsection of a short fanout line is arranged to be longer than a second subsection of a long fanout line through adjusting lengths of a first subsection and the second subsection of the short fanout line, which reduces the impedance difference between the short fanout line and the long fanout line, and even allows the impedance difference between two fanout lines having different lengths to be about zero.

A middlemost fanout line200, a left-longest fanout line100, and a right-longest fanout line300are used as an example. The middlemost fanout line200comprises the first subsection210, the second subsection220, and a third subsection230, where the first subsection210of the middlemost fanout line200and the third subsection230of the middlemost fanout line200are connected a driving circuit board with the signal line of the array substrate, respectively. The first subsection210of the middlemost fanout line200is electrically connected to the third subsection230of the middlemost fanout line200through the second subsection220of the middlemost fanout line200.

As impedances of the left-longest fanout line100and the right-longest fanout line300are greatest in all fanout lines, the left-longest fanout line100and the right-longest fanout line300are not configured with the second subsection. The fanout lines arranged.

between the left-longest fanout line100and the right-longest fanout line300still need to be configured with the second subsection. As the lengths and impedances of the fanout lines, which are successively arranged along the middlemost fanout line200to the left-longest fanout line100and the right-longest fanout line200, successively increase, the length of the second subsection arranged in the fanout lines successively reduce, and a sum of the lengths of the first subsection of the fanout line and the third subsection of the fanout line successively increases, which homogenizes the impedance of different fanout lines, reduces the impedance difference between different fanout lines and even makes the impedance of different fanout lines be same.

As shown inFIG. 5andFIG. 7, the first subsection210and the third subsection230of the middlemost fanout line200have a double conducting films structure. The middlemost fanout line200comprises a first metal conducting film410, an insulating layer420, a second metal conducting film430, and a passivation layer440, where a main work layer of the middlemost fanout line200is the metal conducting film, namely the first metal conducting film410and the second metal conducting film430. The metal conducting film may be manufactured by using a metal having good conductivity, such as molybdenum Mo, aluminum Al, and copper Cu. The second subsection220uses an indium tin oxide (ITO) conducting film where electrical resistivity of the ITO conducting film is greater than the electrical resistivity of the metal conducting film. Thus, the impedance of an entire fanout line can be changed through adjusting the length of the second subsection220. The second subsection of the short fanout line is longer than the second subsection of the long fanout line. In the example, the left-longest fanout line100and the right-longest fanout line300are not configured with the second subsection, thus, the lengths of the second subsections of the left-longest fanout line100and the right-longest fanout line300are regarded as zero, as long as the length of the second subsection of the middlemost fanout line200is not zero, the impedance difference between the middlemost fanout line200and the left-longest/right-longest fanout line reduces. In order to achieve good effect, the length of the second subsection of the middlemost fanout line200is calculated according to actual impedance of the left-longest fanout line100and the right-longest fanout line300, which makes the impedance difference between the middlemost fanout line200and the left-longest/right-longest fanout line be minimum or even be about zero.

As shown inFIG. 5toFIG. 8, in a connection position of the first subsection210of the fanout line and the second subsection220of the fanout line, the first metal conducting film410is configured with an exposed section411and the second metal conducting film430is configured with an exposed section431, where the indium tin oxide conducting film450covers the exposed sections411/431. The indium tin oxide conducting film450forms the second subsection220at break positions of the first subsection210and the third subsection230, which increases a contact area of the first subsection and the third subsection, thereby improving stability of the electrical connection of the first subsection and the third subsection.

In the example, the third subsection and the first subsection have same structure, and the structure of the third subsection comprises the first metal conducting film410, the insulating layer420, the second metal conducting film430, and the passivation layer440arranged on the second metal conducting film430, which are successively arranged on the array substrate. A method of electrically connecting the third subsection230to the second subsection220is same as a method of electrically connecting the third subsection230to the first subsection210. According to a typical process, the fanout line is broken in the middle, the second subsection is arranged at the break position, which simplifies the process, and the impedance of the fanout line is adjusted according to the length of the second subsection.

The example provides the fanout line structure, as shown inFIG. 8, and the example also provides the array substrate comprising a glass substrate10, where the glass substrate10is configured with a plurality of the signal lines13, the plurality of the fanout lines11, and a bonding pad12. The fanout lines11are arranged on the fanout area14of the glass substrate10, and the fanout line structure is the same as the above-mentioned structure.

FIG. 9shows a second example of the present disclosure. A difference between the second example and the first example is that the middlemost fanout line200only comprises the first subsection210and the second subsection220, where the first subsection210uses the metal conducting film structure, and the second subsection220uses the indium tin oxide conducting film structure. The lengths of the first subsection210and the second subsection220is calculated according to the impedances of the left-longest fanout line100and the right-longest fanout line300, which reduces the impedance difference between the middlemost fanout line200and the left-longest fanout line100/the right-longest fanout line300or even makes the impedance difference be about zero.

The present disclosure is described in detail in accordance with the above contents with the specific exemplary examples. However, this present disclosure is not limited to the specific examples. For example, the fanout line of the present disclosure is not limited to have two or three subsections, under the conception of the present disclosure, the ordinary technical personnel of the technical field of the present disclosure easily uses more subsections. Additionally, the materials of the different subsections are not limited to the metal conducting film and the indium tin oxide conducting film, the ordinary technical personnel of the technical field of the present disclosure easily uses other materials. For the ordinary technical personnel of the technical field of the present disclosure, on the premise of keeping the conception of the present disclosure, the technical personnel can also make simple deductions or replacements, and all of which should be considered to belong to the protection scope of the present disclosure.