CN107490885B - Display device - Google Patents
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- CN107490885B CN107490885B CN201710792276.1A CN201710792276A CN107490885B CN 107490885 B CN107490885 B CN 107490885B CN 201710792276 A CN201710792276 A CN 201710792276A CN 107490885 B CN107490885 B CN 107490885B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13458—Terminal pads
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
Abstract
The invention discloses a display device, belonging to the technical field of display, comprising: the display device comprises a display panel, a chip and a flexible circuit board; the flexible circuit board comprises a plurality of first signal wires and a plurality of conductive bonding pads, wherein the first signal wires and the conductive bonding pads are arranged in a one-to-one correspondence manner; the plurality of conductive bonding pads are electrically connected with the display panel; one end of the first signal wire is electrically connected with the conductive bonding pad, and the other end of the first signal wire is electrically connected with the chip; the lengths of the plurality of first signal lines are not completely the same; the resistances of the plurality of conductive pads are not identical; the resistance of the conductive pad correspondingly arranged on the first signal line with the longer length is smaller than that of the conductive pad correspondingly arranged on the first signal line with the shorter length. Compared with the prior art, the display unevenness is improved, and the display quality is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
With the development of display technology, consumer demands for display devices are more and more diversified. The display device with the narrow frame has the advantages of light weight, attractive appearance and the like, and is popular with consumers. In the display device provided by the prior art, a cof (chip On fpc) technology is used to reduce the width of the frame.
Referring to fig. 1, fig. 1 is a schematic plan view of a display device provided in the prior art. The display device shown in fig. 1 includes a display panel 01 and a flexible wiring board 02. The display device further comprises a chip 03, and the chip 03 is used for processing the electric signals in the display panel 01. In order to reduce the area occupied by the chip 03 on the display panel 01, the chip 03 is disposed on the flexible wiring board 02. The flexible printed circuit 02 is provided with a pad 021 and a signal line 022, the flexible printed circuit 02 is electrically connected to the display panel 01 through the pad 021, and the chip 03 is electrically connected to the pad 021 through the signal line 022, so that the chip 03 is electrically connected to the display panel 01. Such a technique of disposing a Chip (Chip) on a Flexible Printed Circuit (FPC) is called a COF technique.
In the display device provided by the prior art, the pads 021 have the same size and the same resistance; since the lengths of the signal lines 022 are not completely the same, and the resistances of the signal lines 022 are not completely the same, the voltage drop of the electrical signal output from the chip 03 after passing through the signal lines 022 and the pads 021 is different, and the display quality of the display panel 01 is reduced due to display unevenness after the electrical signal is transmitted to the display panel 01.
Disclosure of Invention
In view of the foregoing, the present invention provides a display device.
The present invention provides a display device including: the display device comprises a display panel, a chip and a flexible circuit board; the flexible circuit board comprises a first connecting area and a plurality of first signal wires, the first connecting area comprises a plurality of conductive bonding pads, and the first signal wires and the conductive bonding pads are arranged in a one-to-one correspondence mode; the plurality of conductive bonding pads are electrically connected with the display panel; one end of the first signal wire is electrically connected with the conductive bonding pad, and the other end of the first signal wire is electrically connected with the chip; the lengths of the plurality of first signal lines are not completely the same; the resistances of the plurality of conductive pads are not identical; the resistance of the conductive pad correspondingly arranged on the first signal line with the longer length is smaller than that of the conductive pad correspondingly arranged on the first signal line with the shorter length.
Compared with the prior art, the display device provided by the invention at least realizes the following beneficial effects:
the display device provided by the invention comprises: the display device comprises a display panel, a chip and a flexible circuit board; the flexible circuit board comprises a first connecting area and a plurality of first signal wires, the first connecting area comprises a plurality of conductive bonding pads, and the first signal wires and the conductive bonding pads are arranged in a one-to-one correspondence mode; the chip is electrically connected with the display panel through a plurality of first signal lines and a plurality of conductive pads. Since the lengths of the plurality of first signal lines are not completely the same, the resistances of the plurality of first signal lines are not completely the same. When the cross-sectional areas of the first signal lines are the same, the first signal line having a longer length has a larger resistance, and the first signal line having a shorter length has a smaller resistance. In the display device provided by the invention, the resistances of a plurality of conductive bonding pads are not completely the same, and the resistance of the conductive bonding pad corresponding to the first signal line with longer length is smaller than the resistance of the conductive bonding pad corresponding to the first signal line with shorter length; in other words, the first signal line with a relatively high resistance is electrically connected to the conductive pad with a relatively low resistance, so that the voltage drop of the electrical signal in the chip is the same or close to the voltage drop after passing through each first signal line and the conductive pad arranged corresponding to the first signal line. Compared with the prior art, the display unevenness is improved, and the display quality is improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a display device provided in the prior art;
fig. 2 is a schematic plan view of a display device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of the display device provided in FIG. 2;
FIG. 4 is a schematic diagram of a partial structure of another display device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a partial structure of another display device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a partial structure of another display device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a partial structure of another display device according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a partial structure of another display device according to an embodiment of the present invention;
fig. 9 is a partial schematic structural diagram of another display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic plan view of a display device according to an embodiment of the present invention, and fig. 3 is a schematic partial structure of the display device shown in fig. 2. An embodiment of the present invention provides a display device, including: a display panel 10, a chip 20, and a flexible wiring board 30; the flexible circuit board 30 includes a first connection region 31 and a plurality of first signal lines 40, the first connection region 31 includes a plurality of conductive pads 50, and the first signal lines 40 are arranged in one-to-one correspondence with the conductive pads 50; a plurality of conductive pads 50 electrically connected to the display panel 10; one end of the first signal line 40 is electrically connected to the conductive pad 50, and the other end of the first signal line 40 is electrically connected to the chip 20; the lengths of the plurality of first signal lines 40 are not completely the same; the resistances of the plurality of conductive pads 50 are not all the same; the resistance of the conductive pad 50 corresponding to the first signal line 40 with a longer length is smaller than the resistance of the conductive pad 50 corresponding to the first signal line 40 with a shorter length.
In the display device provided in the present embodiment, the display panel 10 has a display function, and may be a liquid crystal display panel, an organic light emitting display panel, or the like, and the specific structure of the display panel 10 is not particularly limited in the present embodiment.
The Flexible Printed Circuit (FPC) includes a first connection region 31, the first connection region 31 includes a plurality of conductive pads 50, the conductive pads 50 are made of a conductive material, usually a metal material, and the plurality of conductive pads 50 are electrically connected to the display panel 10. The flexible wiring board 30 further includes a plurality of first signal lines 40, and the first signal lines 40 are used for transmitting electrical signals. The first signal line 40 is electrically connected to the chip 20. For example, optionally, the chip 20 includes a plurality of pins, each of the pins is disposed in one-to-one correspondence with the first signal line 40, and the first signal line 40 transmits the electrical signal of the chip 20 through the pins. The first signal lines 40 are disposed in one-to-one correspondence with the conductive pads 50. The electrical signal of the chip 20 is transmitted to the display panel 10 through the first signal line 40 and the conductive pad 50 corresponding to the first signal line 40.
In order to reduce the space occupied by the flexible circuit board 30 and the chip 20 in the display device and to make the display device light and thin, the length D1 of the chip 20 is smaller than the length D2 of the first connection region 31, so the lengths of the plurality of first signal lines 40 are not completely the same. The plurality of first signal lines 40 having different lengths means that at least one first signal line 40 among the plurality of first signal lines 40 has a different length from the remaining first signal lines 40. When the sectional areas of the plurality of first signal lines 40 are the same, the first signal lines 40 having a longer length have a larger resistance, and the first signal lines 40 having a shorter length have a smaller resistance. The voltage drop of the electrical signal in the chip 20 after passing through the plurality of first signal lines 40 is different.
In the display device provided in the present embodiment, the resistances of the plurality of conductive pads 50 are not completely the same, that is, at least one conductive pad 50 has a resistance different from the resistances of the remaining conductive pads 50. The resistance of the conductive pad 50 corresponding to the first signal line 40 with a longer length is smaller than the resistance of the conductive pad 50 corresponding to the first signal line 40 with a shorter length. The display device includes a plurality of integrated structures, with the first signal lines 40 and the correspondingly disposed conductive pads 50 as one integrated structure. The equivalent resistance of the overall structure is the sum of the resistance of the first signal line 40 and the resistance of the conductive pad 50 disposed correspondingly. The technical scheme provided by the embodiment of the invention can enable the resistances of a plurality of integral structures to be the same or similar, thereby enabling the voltage drops of the electric signals in the chip 20 after passing through the integral structures to be the same or similar, and improving the uneven display compared with the prior art.
The display device provided by the invention comprises: the display device comprises a display panel, a chip and a flexible circuit board; the flexible circuit board comprises a first connecting area and a plurality of first signal wires, the first connecting area comprises a plurality of conductive bonding pads, and the first signal wires and the conductive bonding pads are arranged in a one-to-one correspondence mode; the chip is electrically connected with the display panel through a plurality of first signal lines and a plurality of conductive pads. Since the lengths of the plurality of first signal lines are not completely the same, the resistances of the plurality of first signal lines are not completely the same. When the cross-sectional areas of the first signal lines are the same, the first signal line having a longer length has a larger resistance, and the first signal line having a shorter length has a smaller resistance. In the display device provided by the invention, the resistances of a plurality of conductive bonding pads are not completely the same, and the resistance of the conductive bonding pad corresponding to the first signal line with longer length is smaller than the resistance of the conductive bonding pad corresponding to the first signal line with shorter length; in other words, the first signal line with a relatively high resistance is electrically connected to the conductive pad with a relatively low resistance, so that the voltage drop of the electrical signal in the chip is the same or close to the voltage drop after passing through each first signal line and the conductive pad arranged corresponding to the first signal line. Compared with the prior art, the display unevenness is improved, and the display quality is improved.
In the display device provided by the embodiment of the present invention, there are various ways to set the resistances of the plurality of conductive pads 50 not to be identical, for example, the plurality of conductive pads 50 may be made of conductive materials with different resistivities, or the plurality of conductive pads 50 may be set to have different physical parameters such as lengths and cross-sectional areas so as to set the resistances of the plurality of conductive pads 50 not to be identical.
In some optional embodiments, please refer to fig. 4, and fig. 4 is a partial structural schematic diagram of another display device provided in the embodiments of the present invention. Fig. 4 follows the reference numerals of fig. 3, and the description of the same parts is omitted. In the display device provided in this embodiment, the chip 20 and the first connection region 31 are sequentially arranged along the first direction x; the lengths L of the plurality of conductive pads 50 in the first direction x are the same; the widths H of the plurality of conductive pads 50 in the second direction y are not all the same; the second direction y is perpendicular to the first direction x; the width H of the conductive pad 50 corresponding to the first signal line 40 with a longer length is greater than the width H of the conductive pad 50 corresponding to the first signal line 40 with a shorter length. In the display device provided in the present embodiment, the widths H of the plurality of conductive pads 50 are set so as to achieve that the resistances of the plurality of conductive pads 50 are not completely the same. Specifically, the calculation formula R of the resistance is ρ L/S (R: resistance, S: cross-sectional area, L: length, ρ: resistivity), where the lengths L of the plurality of conductive pads 50 are the same and the resistivity ρ is the same, and therefore, in the present embodiment, the cross-sectional area S affects the resistance of the conductive pads 50. As known, the cross-sectional area S is H × d, where H is the width of the conductive pad 50 and d is the thickness of the conductive pad 50; in manufacturing the display device, the plurality of conductive pads 50 are generally formed using the same material in the same manufacturing process, and the thickness d thereof is generally the same. Therefore, by providing the width H portions of the plurality of conductive pads 50 to be identical, it is possible to achieve that the resistances of the plurality of conductive pads 50 are not identical. Where, R ═ ρ L/S ═ ρ L/H ×, d, when ρ and L, d are the same, the resistance R is smaller as H is larger, and on the other hand, when ρ and L, d are the same, the resistance R is larger as H is smaller. In the display device provided by the embodiment, in the process of manufacturing the display device, an existing mature manufacturing process can be used, and only parameters of a mask for manufacturing the conductive pads need to be changed, so that the plurality of conductive pads 50 with the width H along the second direction y not identical can be manufactured, and the manufacturing process is simple. Compared with the prior art, the display device provided by the embodiment improves display unevenness and improves display quality.
In some optional embodiments, please refer to fig. 5, and fig. 5 is a partial structural schematic diagram of another display device provided in the embodiments of the present invention. Fig. 5 is different from fig. 4 in that in the display device shown in fig. 5, the widths H of the plurality of conductive pads 50 in the second direction y are the same, and the lengths L of the plurality of conductive pads 50 in the first direction x are not completely the same. The length L of the conductive pad 50 corresponding to the first signal line 40 having a longer length is smaller than the length L of the conductive pad 50 corresponding to the first signal line 40 having a shorter length. According to the formula, when ρ and H, d are the same, L is larger and R is larger, and when ρ and H, d are the same, L is smaller and R is smaller. In the display device provided by the embodiment, in the process of manufacturing the display device, an existing mature manufacturing process can be used, and only parameters of a mask for manufacturing the conductive pads need to be changed, so that the plurality of conductive pads 50 with the length L along the first direction x not identical can be manufactured, and the manufacturing process is simple. Compared with the prior art, the display device provided by the embodiment improves display unevenness and improves display quality.
Fig. 4 and 5 illustrate embodiments in which the resistances of the plurality of conductive pads 50 are not all the same, but are not limited thereto.
In some optional embodiments, please refer to fig. 6, and fig. 6 is a partial structural schematic diagram of another display device provided in the embodiments of the present invention. Fig. 6 follows the reference numerals of fig. 4, and the description of the same parts is omitted. In the display device provided in this embodiment, on the basis of the display device provided in fig. 4, the first connection region 31 extends along the second direction y; the first connection region 31 includes a first sub-connection region 311, a second sub-connection region 312, and a third sub-connection region 313 arranged in this order in the second direction y; the widths H of the conductive pads 50 in the second sub-connection regions are the same; the width H of the conductive pad 50 of the first sub-connection region 311, which is located at a greater distance from the second sub-connection region 312, is greater than the width H of the conductive pad 50, which is located at a smaller distance from the second sub-connection region 312; in the third sub-connection region 313, the width H of the conductive pad 50 having a larger distance from the second sub-connection region 312 is larger than the width H of the conductive pad 50 having a smaller distance from the second sub-connection region 312. Optionally, in the first connection region 31, the plurality of conductive pads 50 are arranged in a row along the second direction y.
In the display device provided in the embodiment of fig. 6, the lengths of the plurality of first signal lines 402 disposed corresponding to the plurality of conductive pads 50 in the second sub-connection region 312 are also the same, specifically, the plurality of first signal lines 402 may extend along the first direction x, and accordingly, the widths H of the conductive pads 50 disposed in the second sub-connection region are the same.
In the first sub-connection region 311, the lengths of the plurality of first signal lines 401 provided corresponding to the plurality of conductive pads 50 are different, and the length of the first signal line 401 is longer as the distance from the first signal line 402 is larger. Accordingly, in the first sub-connection region 311, the width H of the conductive pad 50 having a larger distance from the second sub-connection region 312 is greater than the width H of the conductive pad 50 having a smaller distance from the second sub-connection region 312; in other words, the resistance of the conductive pad 50, which is located at a greater distance from the second sub-connection region 312, is less than the resistance of the conductive pad 50, which is located at a smaller distance from the second sub-connection region 312.
In the third sub-connection region 313, the lengths of the plurality of first signal lines 403 provided corresponding to the plurality of conductive pads 50 are different, and the length of the first signal line 403 is longer as the distance from the first signal line 402 is larger. Accordingly, the width H of the conductive pad 50 of the third sub-connection region 313, which is located at a greater distance from the second sub-connection region 312, is greater than the width H of the conductive pad 50, which is located at a smaller distance from the second sub-connection region 312; in other words, the resistance of the conductive pad 50, which is located at a greater distance from the second sub-connection region 312, is less than the resistance of the conductive pad 50, which is located at a smaller distance from the second sub-connection region 312.
In the display device provided in the embodiment of fig. 6, three sub-connection regions, namely, a first sub-connection region 311, a second sub-connection region 312 and a third sub-connection region 313, are disposed in the first connection region 31, and the widths of the conductive pads 50 in the sub-connection regions are respectively set according to the lengths of the correspondingly disposed first signal lines 40 of the three sub-connection regions, so as to adjust the resistances of the conductive pads 50. The first signal line with larger resistance is electrically connected with the conductive bonding pad with smaller resistance, so that the voltage drop of the electric signal in the chip is the same or close to the voltage drop after passing through each first signal line and the conductive bonding pad arranged corresponding to the first signal line. Compared with the prior art, the display unevenness is improved, and the display quality is improved.
In some optional embodiments, please refer to fig. 7, and fig. 7 is a partial structural schematic diagram of another display device provided in the embodiments of the present invention. Fig. 7 follows the reference numerals of fig. 3, and the description of the same parts is omitted. On the basis of the display device provided in any embodiment of the present invention, in the display device provided in this embodiment, in the first connection region 31, the plurality of conductive pads 50 are arranged in the first row 501 and the second row 502; the plurality of conductive pads 50 in the first row 501 are arranged along the second direction y, and the plurality of conductive pads 50 in the second row 502 are arranged along the second direction y; the chips 20, the first row 501 and the second row 502 are sequentially arranged along a first direction x; the second direction y is perpendicular to the first direction x. In the display device provided by this embodiment, the plurality of conductive pads 50 may be arranged in two rows, when the number of the conductive pads 50 is the same, the width H of each conductive pad 50 may be set wider, and when the conductive pads 50 are electrically connected to the display panel 10, the wider the width of the conductive pads 50 is, the lower the precision requirement for matching with the display panel 10 is, so that the precision for binding the flexible circuit board 30 and the display panel 10 may be reduced, and the manufacturing yield of the display device may be improved.
In some alternative embodiments, with continued reference to fig. 7, the first signal line 40 includes a first sub-signal line 40a and a second sub-signal line 40 b; the first sub-signal lines 40a are provided in one-to-one correspondence with the plurality of conductive pads 50 in the first row 501; the second sub-signal lines 40b are arranged in one-to-one correspondence with the plurality of conductive pads 50 in the second row 502; the first sub-signal lines 40a and the second sub-signal lines 40b are alternately arranged in the second direction y. In the display device provided in this embodiment, in order to avoid short circuit caused by the intersection of the first sub-signal line 40a and the second sub-signal line 40b, the first sub-signal line 40a and the second sub-signal line 40b are alternately arranged along the second direction y; optionally, the plurality of conductive pads 50 in the first row 501 and the plurality of conductive pads 50 in the second row 502 are staggered to realize that the first sub-signal lines 40a and the second sub-signal lines 40b are alternately arranged along the second direction y.
In some alternative embodiments, with continued reference to fig. 7, the lengths L of the conductive pads 50 in the first row 501 along the first direction x are all a, and the lengths L of the conductive pads 50 in the second row 502 along the first direction x are all B; wherein A > B. In the display device provided in the present embodiment, the first sub-signal line 40a is disposed corresponding to the conductive pad 50 in the first row 501, and the second sub-signal line 40b is disposed corresponding to the conductive pad 50 in the second row 502. Since the plurality of conductive pads 50 in the second row 502 are located at a greater distance from the chip 20, in some alternative embodiments, the length of the second sub-signal line 40b is greater than the length of the first sub-signal line 40a, and accordingly, the resistance of the second sub-signal line 40b is greater than the resistance of the first sub-signal line 40 a. According to the formula, when ρ and H, d are the same, L is larger and R is larger, and when ρ and H, d are the same, L is smaller and R is smaller. Setting the length L of the plurality of conductive pads 50 in the second row 502 to be smaller can make the resistance of the plurality of conductive pads 50 in the second row 502 smaller, so that the voltage drop of the electrical signal in the chip is the same or close after passing through the first sub-signal line 40a, the conductive pads 50 in the first row 501 corresponding to the first sub-signal line 40a, and the second sub-signal line 40b, the conductive pads 50 in the second row 502 corresponding to the second sub-signal line 40 b. Compared with the prior art, the display unevenness is improved, and the display quality is improved.
In some optional embodiments, please refer to fig. 8, and fig. 8 is a partial structural schematic diagram of another display device provided in the embodiments of the present invention. Fig. 8 follows the reference numerals of fig. 7, and the present embodiment will be described herein only on the basis of the display device provided in fig. 7. On the basis of the display device provided by any embodiment of the present invention, the first connection region 31 and the chip 20 are oppositely disposed; the side of the first connection region 31 close to the chip 20 is a first connection edge 300; the first connecting edge 300 comprises a first end 301 and a second end 302; the side of the chip 20 close to the first connection region 31 is a first chip edge 21; the first chip side 21 comprises a third end 213 and a fourth end 214; the connecting line of the first end 301 and the third end 213 is a first connecting line B1, and the connecting line of the second end 302 and the fourth end 214 is a second connecting line B2; the first connecting line B1, the second connecting line B2, the first connecting edge 300 and the first chip edge 21 define a trapezoidal area; the at least one first signal line 40 extends outside the trapezoidal region. It should be noted that the first connection line B1 and the second connection line B2 are not actually present on the flexible wiring board 30, but are artificially drawn lines for clearly explaining the technical solution of the present embodiment. In the display device provided by the prior art, the first signal lines 40 are disposed in the trapezoidal area. In the display device provided by the embodiment, the at least one first signal line 40 extends to the outside of the trapezoid area, so that the space outside the trapezoid area can be fully utilized for wiring, the distance between the adjacent first signal lines 40 can be increased, short circuit caused by the fact that the distance between the first signal lines 40 is too small can be prevented, and the yield of manufacturing the display panel is improved. After the first signal line 40 extends to the outside of the trapezoid area, the routing length is increased, and the resistance increase of the whole structure caused by the length increase of the first signal line 40 can be offset by reducing the resistance of the conductive pad 50 arranged corresponding to the first signal line 40.
In some alternative embodiments, chip 20 further includes a second chip side 22, a third chip side 23, and a fourth chip side 24; the first chip side 21 is arranged opposite to the second chip side 22, and the third chip side 23 is arranged opposite to the fourth chip side 24; the first signal line 40 extending out of the sector is electrically connected to any one of the second chip side 22, the third chip side 23, and the fourth chip side 24. The chip 20 is provided with a pin, and the first signal line 40 is electrically connected to the chip 20 through the pin. In the display device provided by the embodiment, the pins are disposed at the positions corresponding to the first chip side 21, the second chip side 22, the third chip side 23 and the fourth chip side 24. The first signal line 40 extending out of the sector area is electrically connected with any one of the second chip side 22, the third chip side 23 and the fourth chip side 24, so that the number of pins on one side of the first chip side 21 can be reduced, the distance between the pins can be increased, the alignment precision of the chip 20 and the plurality of first signal lines 40 is reduced, and the yield of the display device is improved.
In some optional embodiments, please refer to fig. 9, and fig. 9 is a partial structural schematic diagram of another display device provided in the embodiments of the present invention. Fig. 9 follows the reference numerals of fig. 4, and the description of the same parts is omitted. The present embodiment is described herein only on the basis of the display device provided in fig. 4. On the basis of the display device provided in any of the embodiments of the present invention, the flexible wiring board 30 includes a first sub-flexible wiring board 30a and a second sub-flexible wiring board 30 b; the first sub flexible wiring board 30a includes a first connection region 31 and a plurality of first signal lines 40; the first sub flexible wiring board 30a further includes a plurality of second signal lines 42; one end of the second signal line 42 is electrically connected to the chip 20, and the other end of the second signal line 42 is electrically connected to the second sub flexible wiring board 40 b. In the display device provided in this embodiment, the flexible printed circuit 30 is formed by splicing two sub-flexible printed circuit boards electrically connected to each other, wherein the first sub-flexible printed circuit 30a is used for binding the chip 20, and the second sub-flexible printed circuit 30b is used for transmitting an electrical signal to the chip 20.
It should be noted that the display device provided in the embodiment of the present invention may be other display devices with a display function, such as a mobile phone, a computer, a television, and a vehicle-mounted display device, and the present invention is not limited to this.
As can be seen from the above embodiments, the display device provided by the present invention at least achieves the following beneficial effects:
the display device provided by each embodiment of the invention comprises a display panel, a chip and a flexible circuit board; the flexible circuit board comprises a first connecting area and a plurality of first signal wires, the first connecting area comprises a plurality of conductive bonding pads, and the first signal wires and the conductive bonding pads are arranged in a one-to-one correspondence mode; the chip is electrically connected with the display panel through a plurality of first signal lines and a plurality of conductive pads. Since the lengths of the plurality of first signal lines are not completely the same, the resistances of the plurality of first signal lines are not completely the same. When the cross-sectional areas of the first signal lines are the same, the first signal line having a longer length has a larger resistance, and the first signal line having a shorter length has a smaller resistance. In the display device provided by the invention, the resistances of a plurality of conductive bonding pads are not completely the same, and the resistance of the conductive bonding pad corresponding to the first signal line with longer length is smaller than the resistance of the conductive bonding pad corresponding to the first signal line with shorter length; in other words, the first signal line with a relatively high resistance is electrically connected to the conductive pad with a relatively low resistance, so that the voltage drop of the electrical signal in the chip is the same or close to the voltage drop after passing through each first signal line and the conductive pad arranged corresponding to the first signal line. Compared with the prior art, the display unevenness is improved, and the display quality is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. A display device, comprising:
the display device comprises a display panel, a chip and a flexible circuit board;
the flexible circuit board comprises a first connecting area and a plurality of first signal wires, the first connecting area comprises a plurality of conductive bonding pads, and the first signal wires and the conductive bonding pads are arranged in a one-to-one correspondence mode;
the plurality of conductive pads are electrically connected with the display panel;
one end of the first signal wire is electrically connected with the conductive bonding pad, and the other end of the first signal wire is electrically connected with the chip;
the lengths of the plurality of first signal lines are not completely the same; the resistances of the plurality of conductive pads are not identical; wherein the content of the first and second substances,
the resistance of the conductive bonding pad correspondingly arranged on the first signal line with the longer length is smaller than that of the conductive bonding pad correspondingly arranged on the first signal line with the shorter length;
the chip and the first connection region are sequentially arranged along a first direction; the widths of the plurality of conductive pads in the second direction are not completely the same; the second direction is perpendicular to the first direction;
the width of the conductive bonding pad correspondingly arranged on the first signal line with the longer length is larger than that of the conductive bonding pad correspondingly arranged on the first signal line with the shorter length;
in the first connection region, the plurality of conductive pads are arranged in a first row and a second row; a plurality of the conductive pads in the first row are arranged in a second direction, and a plurality of the conductive pads in the second row are arranged in the second direction;
the chips, the first row and the second row are sequentially arranged along a first direction; the second direction is perpendicular to the first direction;
the lengths of the plurality of conductive pads in the first row along the first direction are all A, and the lengths of the plurality of conductive pads in the second row along the first direction are all B; wherein A > B.
2. The display device according to claim 1,
the plurality of conductive pads are the same length along the first direction.
3. The display device according to claim 2,
the first connection region extends in the second direction;
the first connection region comprises a first sub-connection region, a second sub-connection region and a third sub-connection region which are sequentially arranged along the second direction;
the widths of the conductive pads in the second sub-connection region are the same;
in the first sub-connection region, the width of the conductive pad with a larger distance from the second sub-connection region is larger than the width of the conductive pad with a smaller distance from the second sub-connection region;
in the third sub-connection region, the width of the conductive pad having a larger distance from the second sub-connection region is larger than the width of the conductive pad having a smaller distance from the second sub-connection region.
4. The display device according to claim 1,
in the first connection region, the plurality of conductive pads are arranged in a row along the second direction.
5. The display device according to claim 1,
the first signal line comprises a first sub-signal line and a second sub-signal line;
the first sub-signal lines are arranged in one-to-one correspondence with the conductive pads in the first row;
the second sub-signal lines are arranged in one-to-one correspondence with the plurality of conductive pads in the second row;
the first sub-signal lines and the second sub-signal lines are alternately arranged along the second direction.
6. The display device according to claim 1,
the first connection region and the chip are oppositely arranged;
one side of the first connecting area, which is close to the chip, is a first connecting edge; the first connecting edge comprises a first end and a second end;
one side of the chip close to the first connecting area is a first chip edge; the first chip side comprises a third end and a fourth end;
the connecting line of the first end and the third end is a first connecting line, and the connecting line of the second end and the fourth end is a second connecting line;
the first connecting line, the second connecting line, the first connecting edge and the first chip edge define a trapezoidal area;
at least one of the first signal lines extends outside the trapezoidal region.
7. The display device according to claim 6,
the chip further comprises a second chip side, a third chip side and a fourth chip side; the first chip side and the second chip side are arranged oppositely, and the third chip side and the fourth chip side are arranged oppositely;
the first signal line extending outside a sector is electrically connected to any one of the second chip side, the third chip side, and the fourth chip side.
8. The display device according to claim 1,
the flexible circuit board comprises a first sub flexible circuit board and a second sub flexible circuit board;
the first sub-flexible wiring board includes the first connection region and the plurality of first signal lines; the first sub-flexible circuit board also comprises a plurality of second signal wires;
one end of the second signal wire is electrically connected with the chip, and the other end of the second signal wire is electrically connected with the second sub-flexible circuit board.
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| CN110139470A (en) * | 2019-05-13 | 2019-08-16 | 深圳市华星光电技术有限公司 | Flexible circuit board and display device |
| US20220344449A1 (en) * | 2020-03-13 | 2022-10-27 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display panel and display device |
| EP4067984A4 (en) * | 2020-06-15 | 2023-04-26 | BOE Technology Group Co., Ltd. | Display panel and display device |
| CN111681538A (en) * | 2020-06-24 | 2020-09-18 | 武汉华星光电技术有限公司 | Display panel and display device |
| CN112669756A (en) * | 2020-12-29 | 2021-04-16 | 厦门天马微电子有限公司 | Array substrate, driving chip and display device |
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