阅读说明：本技术 覆晶薄膜及显示面板 (Chip on film and display panel ) 是由 李春旺 于 2019-09-27 设计创作，主要内容包括：本发明提供一种覆晶薄膜及显示面板,相较于现有技术中同样尺寸的覆晶薄膜,本发明中覆晶薄膜中电极一端设置有切割区,电极在所述切割区处缩窄,电极的缩放部尺寸变小,可以增加与显示面板显示区的外漏信号端子连接的电极数量,同时降低覆晶薄膜端部毛刺的管控规格,提升了显示面板的良率,提高了显示面板的分辨率及显示品质。(Compared with the chip on film with the same size in the prior art, the chip on film provided by the invention has the advantages that the cutting area is arranged at one end of the electrode in the chip on film, the electrode is narrowed at the cutting area, the size of the contraction and enlargement part of the electrode is reduced, the number of the electrodes connected with the leakage signal terminal of the display area of the display panel can be increased, the control specification of burrs at the end part of the chip on film is reduced, the yield of the display panel is improved, and the resolution and the display quality of the display panel are improved.)

1. A chip on film, comprising:

a driving area for setting a driving unit;

the electrode comprises a base body, a zooming part and a transition part positioned between the base body and the zooming part;

and one end of the signal wire is connected to the substrate, and the other end of the signal wire is connected to the driving area, so that the electrode is electrically connected with the driving unit.

2. The chip on film of claim 1, wherein the width of the scaling part is smaller than the width of the substrate.

3. The chip on film according to claim 1, wherein the distal end of the scaling part is connected to an outer drain signal terminal of a display area of the display panel.

4. The chip on film of claim 1, wherein the width of the scaling part is greater than or equal to 6 μm.

5. The chip on film of claim 1, wherein the two sides of the transition portion are curved or inclined.

6. The COF of claim 1, wherein the signal lines are disposed in the same layer as source/drain electrodes of a display region of the display panel.

7. The chip on film of claim 1, wherein the signal lines comprise gate lines and electrostatic transmission lines, the gate lines are disposed on the same layer as the second gate layer of the display area of the display panel, and the electrostatic transmission lines are disposed on the same layer as the source/drain electrodes of the display area of the display panel.

8. The chip on film of claim 1, wherein the signal line and the electrode are connected by anisotropic conductive paste.

9. A display panel, comprising:

a driving area for setting a driving unit; the electrode comprises a base body, a zooming part and a transition part positioned between the base body and the zooming part; and one end of the signal wire is connected to the substrate, and the other end of the signal wire is connected to the driving area, so that the electrode is electrically connected with the driving unit.

An outer leakage signal terminal connected with the zooming portion.

10. The display panel according to claim 9, wherein the outer leakage signal terminal is provided with a test terminal for outputting an electrical signal of the outer leakage signal terminal.

Technical Field

The invention relates to the technical field of display, in particular to a chip on film and a display panel.

Background

With the progress of display technology, the flexible structure and high resolution of the OLED product are more and more demanding. For the same size screen, the more densely the required bonded electrodes are, the better the screen display quality is; under the condition that the total width of the chip on film is not changed, the narrower the size of the single electrode is, the better the size is.

In the present chip on film processing procedure, the chip on film sheet is formed through die-cut through the chip on film coiled material, can produce the burr when punching the sheet into, easily lead to two adjacent electrodes during operation because of unsatisfying burr minimum safe distance and short circuit, cause the chip on film to damage, direct influence display panel's resolution ratio and quality, for example chip on film's processing procedure in the current AMOLED display panel, chip on film end electrode design is as follows, electrode size 14um, the interval between the electrode is 14um, the die-cut burr of electrode is less than 14um, just can guarantee that two adjacent electrodes can not short circuit, it is less to cause the quantity of binding the electrode.

In summary, a new chip on film needs to be designed to solve the technical problems in the prior art that the minimum safety distance of burrs between the sizes of two adjacent electrodes in the chip on film is small, short circuit is easy to occur, the chip on film is damaged, and the resolution and quality of the display panel are directly affected.

Disclosure of Invention

The invention provides a chip on film and a display panel, which can solve the technical problems that the minimum safe distance of burrs between the sizes of two adjacent electrodes in the chip on film is small, short circuit is easy to occur, the chip on film is damaged, and the resolution and the quality of the display panel are directly influenced in the prior art.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the present invention provides a chip on film, comprising: a driving area for setting a driving unit; the electrode comprises a base body, a zooming part and a transition part positioned between the base body and the zooming part; and one end of the signal wire is connected to the substrate, and the other end of the signal wire is connected to the driving area, so that the electrode is electrically connected with the driving unit.

According to a preferred embodiment of the present invention, the width of the zooming portion is smaller than the width of the base.

According to a preferred embodiment of the present invention, the end of the zooming portion is connected to the outer drain signal terminal of the display region of the display panel.

According to a preferred embodiment of the present invention, the width of the scaling part is greater than or equal to 6 μm.

According to a preferred embodiment of the present invention, both sides of the transition portion are curved or sloped.

According to a preferred embodiment of the present invention, the signal lines and the source/drain electrodes of the display region of the display panel are disposed in the same layer.

According to a preferred embodiment of the present invention, the signal line includes a gate line and an electrostatic transmission line, the gate line is disposed on the same layer as the second gate layer of the display area of the display panel, and the electrostatic transmission line is disposed on the same layer as the source/drain electrodes of the display area of the display panel.

According to a preferred embodiment of the present invention, the signal line and the electrode are connected by anisotropic conductive paste.

The present invention also provides a display panel, including:

a driving area for setting a driving unit; the electrode comprises a base body, a zooming part and a transition part positioned between the base body and the zooming part; and one end of the signal wire is connected to the substrate, and the other end of the signal wire is connected to the driving area, so that the electrode is electrically connected with the driving unit.

An outer leakage signal terminal connected with the zooming portion.

According to a preferred embodiment of the present invention, the outer leakage signal terminal is provided with a test terminal, and the test terminal is used for outputting an electrical signal of the outer leakage signal terminal.

The invention has the beneficial effects that: compared with the chip on film with the same size in the prior art, one end of the electrode in the chip on film is provided with the cutting area, the electrode is narrowed at the cutting area, the size of the electrode is reduced, the number of the electrodes connected with the leakage signal terminal of the display area of the display panel can be increased, the control specification requirement of the burr of the chip on film is reduced, the yield of the display panel is improved, and the resolution and the display quality of the display panel are improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a chip on film according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an electrode structure in a chip on film according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a conventional COF according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an improved COF according to an embodiment of the present application;

fig. 5 is a schematic view of a display panel according to an embodiment of the present disclosure.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.

The invention aims at the technical problems that the minimum safety distance of burrs between the sizes of two adjacent electrodes in the chip on film is small, short circuit is easy to occur, the chip on film is damaged, and the resolution and the quality of a display panel are directly influenced in the prior art, and the defect can be solved in the embodiment.

As shown in fig. 1 to 2, an embodiment of the present invention provides a flip chip film 100, including: a drive area 101 for setting a drive unit; an array of distributed electrodes 102, the electrodes 102 comprising a base 1031, a zoom portion 1033, and a transition portion 1032 between the base 1031 and the zoom portion 1033; one end of the signal line 102 is connected to the substrate 1031, and the other end is connected to the driving region 101, so that the electrode 103 is electrically connected to the driving unit.

Specifically, the display panel is widely used, and the electric charges and the control signals required by the pixel driving of the display panel are all from an external flexible circuit board, and the driving signals and the data signals in the flexible circuit board need to be transmitted to the display panel through a flip chip film. One end of the chip on film is connected with the flexible circuit board, the other end of the chip on film is connected with an outer leakage signal terminal of a display area in the display panel, the outer leakage signal terminal is smaller, the distance between two adjacent outer leakage signal terminals is smaller, the cross section size of the signal wire is larger relative to the width of the outer leakage signal terminal, the signal wire is directly connected with the signal wire and is easy to short circuit, and therefore electrodes with the size smaller than that of the signal wire are prepared for connection.

The driving unit comprises a driving chip, and the driving chip comprises at least one of a gate driving circuit, an electrostatic protection circuit and a data signal circuit. The driving chip is used for source driving and gate driving in the display panel, and the output data signal is transmitted to the display panel through the electrode 103 so as to drive the display panel to display. The other side of the driving unit is connected to the printed circuit board and is responsible for receiving the electric signals transmitted by the printed circuit board and realizing the reliable transmission of the driving signals of the display panel.

The electrodes 103 are punched and cut into sheets from a coil material and are integrally formed, each electrode 103 comprises a base body 1031, a zooming part 1033 and a transition part 1032 positioned between the base body 1031 and the zooming part 1033, the base body 1031 and the zooming part 1033 are both rectangular, the width of the zooming part 1033 is smaller than that of the base body 1031, the width is both 100 μm and 1 μm, and the width of the zooming part 1033 in the embodiment is preferably larger than or equal to 6 μm due to process limitations. The base 1031, the zooming part 1032 and the transition part 1032 are all in an axisymmetric pattern, and the central lines are on the same straight line. The width of the transition part 1032 far from the base 1031 is gradually narrowed, two sides of the transition part 1032 are arc-shaped or oblique lines, and when the two sides are arc-shaped, the arc-shaped is bent inwards to play a role of smooth transition; when both sides are oblique lines, the transition portion 1032 has an inverted trapezoidal cross-sectional shape. The end of each electrode 103 is connected to the outer leakage signal terminal of the display area of the display panel, in this embodiment, the zooming portion 1033 is connected to the outer leakage signal terminal by an anisotropic conductive adhesive, and the outer leakage signal terminal is provided with a test terminal for outputting an electrical signal of the outer leakage signal terminal.

One end of the signal line 102 is connected to the substrate 1031, and the other end is connected to the driving region 101, so that the electrode 103 is electrically connected to the driving unit. Therefore, a plurality of anisotropic conductive adhesive dots are arranged at two ends of the signal wire, each anisotropic conductive adhesive dot is conducted with one electrode, and the plurality of anisotropic conductive adhesive dots are favorable for signal transmission.

The signal lines 102 are arranged in the same layer or different layers, and the signal lines 102 include a plurality of metal lines, and the metal lines include one or more film layer grids of silver, copper, aluminum, molybdenum and titanium.

The signal line 102 and the source/drain of the display region are disposed on the same layer, for example, a top gate thin film transistor, the display region of the display panel includes a light shielding layer on the surface of a flexible substrate, a buffer layer disposed on the light shielding layer, an active layer disposed on the buffer layer, a gate insulating layer disposed on the active layer, a gate disposed on the gate insulating layer, an interlayer dielectric layer disposed on the gate, a source/drain layer disposed on the interlayer dielectric layer, a protective layer disposed on the source/drain layer, a touch electrode layer disposed on the protective layer, a passivation layer disposed on the touch electrode, and a pixel electrode disposed on the passivation layer, and the pixel electrode is connected to the drain through a first via hole. The source/drain layer includes a source, a drain, and a signal line 102 disposed in the same layer as the source and the drain.

The signal lines 102 are disposed in different layers, and the signal lines 102 include gate lines and electrostatic transmission lines, the gate lines are gate driving lines, the electrostatic transmission lines are electrostatic protection circuit lines, the gate lines are disposed in the same layer as the second gate layer of the display area, the electrostatic transmission lines are disposed in the same layer as the source/drain electrodes of the display area, taking another top gate thin film transistor as an example, the display area in the display panel includes: the electrostatic transmission line and the active layer are arranged on the same layer, the first grid insulation layer covers the active layer, and the first grid insulation layer is a silicon oxide layer, a silicon nitride layer or a silicon nitride lamination layer. The first gate layer is arranged on the first gate insulating layer and is a multilayer composite metal layer; the second gate insulating layer is covered on the first gate insulating layer and the first gate layer, the second gate insulating layer is a silicon oxide layer, a silicon nitride layer or a silicon nitride laminated layer, the second gate layer is arranged on the second gate insulating layer and is a multi-layer composite metal layer, the gate line and the second gate layer are arranged on the same layer, and the interlayer insulating layer is covered on the second gate insulating layer and the second gate layer.

In order to verify that the shape of the tail end of an electrode in a chip on film is improved in the embodiment of the application, so that the distance between adjacent electrodes is increased, the control specification of contact burrs between the electrode and an outer leakage signal terminal is reduced, and the quality and the resolution of a display panel are improved, an inventor conducts two groups of tests, as shown in fig. 3, the first electrode 301, the second electrode 302 and the third electrode 303 are in the same shape, the widths of the first electrode, the second electrode and the third electrode are 14um, and the distance between the two adjacent electrodes is also 14um in the conventional design of the chip on film; as shown in fig. 4, in the modified design of the chip on film, the shapes of the fourth electrode 401, the fifth electrode 402 and the sixth electrode 403 are the same, and the fourth electrode, the fifth electrode and the sixth electrode all include normal portions and narrow portions located in the dicing area 404, the widths of the normal portions are both 14um, the widths of the narrow portions are both 6um, the distance between adjacent narrow portions is 22um, the distance between adjacent normal portions is 14um, and the results of two sets of tests are obtained by comparing the chip on film in the conventional design with the chip on film in the modified design, as shown in table 1.

TABLE 1 COF conventional design and COF modified design

It can be seen from table 1 that the initial width of the electrode in the conventional design and the improved design of the chip on film is 14um, the specification requirement of the burr allowed at the end of the electrode is less than 14um, the chip on film can overcome the defect that the burr is 22um far greater than the 14um of the conventional design after the improved design, the advantage is greater, the control specification requirement of the burr at the end of the chip on film is reduced, thereby the number of the connected leakage signal terminals can be increased, and the quality and the resolution of the display panel are improved.

According to the above object of the present invention, as shown in fig. 5, there is provided a display panel 200 comprising:

a drive area 101 for setting a drive unit; the electrodes 103 are distributed in an array and comprise a base body, a zooming part and a transition part positioned between the base body and the zooming part; one end of the signal line 102 is connected to the substrate, and the other end is connected to the driving region 101, so that the electrode 103 is electrically connected to the driving unit.

And an outer leakage signal terminal 201, wherein the outer leakage signal terminal 201 is connected with the zooming part.

The external leakage signal terminal 201 is provided with a test terminal 202, and the test terminal 202 is used for outputting an electric signal of the external leakage signal terminal 201.

According to the invention, the cutting area is arranged at one end of the electrode in the chip on film, the electrode is narrowed at the cutting area, the size of the electrode is reduced, the number of the electrodes connected with the leakage signal terminal of the display area of the display panel can be increased, the control specification requirement of the burr of the chip on film is reduced, the yield of the display panel is improved, and the resolution and the display quality of the display panel are improved.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.