CN1206886C

CN1206886C - Flat panel display and its printed circuit board

Info

Publication number: CN1206886C
Application number: CN 01137845
Authority: CN
Inventors: 朱俊彦
Original assignee: Chi Mei Optoelectronics Corp
Current assignee: Chi Mei Optoelectronics Corp
Priority date: 2001-11-02
Filing date: 2001-11-02
Publication date: 2005-06-15
Anticipated expiration: 2021-11-02
Also published as: CN1416309A

Abstract

A flat panel display comprises a display panel; a first printed circuit board connected to the display panel, the first printed circuit board having a connector; a second printed circuit board connected to the display panel, the second printed circuit board having a main body and a branch portion extending from the main body, the branch portion having a terminal portion (terminating portion), a plurality of conductive leads being provided on a surface of the main body and extending to the terminal portion; wherein the terminal portion of the branch portion and the plurality of conductive leads thereon are inserted into the connector of the first printed circuit board.

Description

Flat-panel screens and printed circuit board (PCB) thereof

Technical field

The present invention relates to a kind of printed circuit of flat-panel screens, relate to a kind of LCD (Liquid Crystal Display, printed circuit board (PCB) LCD) of being used for especially.

Background technology

When electronic installation (for example flat-panel screens) has the more than one printed circuit board (PCB) of surpassing, just need these printed circuit board (PCB)s device connected to one another.In some example, be to use pliable printed circuit (Flexible Printed Circuits, FPC) these printed circuit board (PCB)s are connected to each other, and each connection all needs the one or both ends of a connector (connector) at this pliable printed circuit (FPC).Connector is to be used to allow these functional element, and for example interface card or circuit board are in order to test, to reform (rework) or during maintenance, can individually being pegged graft or remove.

Fig. 1 and Fig. 2 illustrate a traditional LCD module (LCD module) 100.This LCD module 100 mainly is to comprise a display panels (liquid crystal displaypanel) 110,130,140 and back light units of 120, two printed circuit board (PCB)s of a plurality of winding bearing-type packaging structures (TCP) (backlight unit) (not being shown among the figure).This display panels 110 mainly comprises a top glass substrate 112, a lower glass substrate 114 and a liquid crystal layer (not being shown among the figure) that is located between this substrate 112,114.Side is pasted with polaroid (Polarizing Film) (not being shown among the figure) respectively outside this substrate 112,114.This printed circuit board (PCB) 130 is provided with a pliable printed circuit (FPC) 150.This printed circuit board (PCB) 140 is provided with a connector (connector) 160.

Referring to Fig. 2, these a plurality of winding bearing-type packaging structures (TCP) the 120th along the curved edge of this LCD module 100, make printed circuit board (PCB) 130,140 turn to the behind of this LCD module 100.

At this moment, this pliable printed circuit 150 is plugged on this connector (connector) 160, makes printed circuit board (PCB) 130,140 to be connected to each other by pliable printed circuit 150.

In above-mentioned conventional art, need pliable printed circuit to connect two circuit boards.Therefore, this extra pliable printed circuit material cost will increase the whole manufacturing cost of LCD module.In addition, pliable printed circuit generally is to utilize surperficial ways of connecting (SMT) to be welded on the printed circuit board (PCB).And, after pliable printed circuit is welded in printed circuit board (PCB), must be tested.And this extra manufacturing process and testing procedure will make whole manufacturing process complicated, and elongate and make the required production time (cycle time) of LCD module, thereby increase manufacturing cost.

Summary of the invention

Main purpose of the present invention is to provide a kind of printed circuit board (PCB), and it can overcome aforementioned prior art problems.

Another object of the present invention is to provide a kind of printed circuit board (PCB), it can remove the needs for pliable printed circuit fully, yet still can provide physics and electrical connection between more than one printed circuit board (PCB).

In order to achieve the above object, the invention provides a kind of printed circuit board (PCB), comprising: a sandwich layer, this sandwich layer have a main body and a branched portion that is formed by this Subject Extension, and this branched portion has a terminal part (terminal portion); Conducting channel is located at least one surface in this sandwich layer main body upper surface and the lower surface; With, many conductive lead wires are located at least one surface in this sandwich layer branched portion upper surface and the lower surface, the first end of these many conductive lead wires is to be electrically connected to this conducting channel, the second end of these many conductive lead wires is located on the terminal part of this branched portion, terminal part by this branched portion is plugged in the connector (a for example pliability connector (FPCconnector)), the second end of these many conductive lead wires can be electrically connected to this connector, wherein this connector is to have the plastic cement element that several are electrically connected the contact, in order to a separable interface to be provided between this printed circuit board (PCB) and another printed circuit board (PCB).

The main body upper surface of this first conducting channel and this sandwich layer is covered by a ground floor solder mask (solder mask), and wherein the branched portion surface of this sandwich layer is to be exposed to this ground floor solder mask.Except the second end of the terminal part of branched portion and many conductive lead wires, the lower surface of this sandwich layer, the remainder of many conductive lead wires and this second conducting channel are covered by a second layer solder mask.

Preferably, to have a part at least be to be used to be connected to a winding bearing-type packaging structure (TCP) for this first conducting channel or second conducting channel.In addition, it is to be used to be electrically connected to a drive integrated circult (drive IC) that this first conducting channel or second conducting channel preferably have a part at least, for example a grid-driving integrated circuit (gate drive IC).

According to printed circuit board (PCB) of the present invention, it is characterized in that having integrated branched portion.The terminal part of this branched portion (comprising conductive lead wire the second end provided thereon) is directly to be plugged on the connector that is located on another printed circuit board (PCB), does not need pliable printed circuit in view of the above and still can provide physics and electrical connection between this two printed circuit board (PCB).

The present invention also provides a kind of flat-panel screens (for example LCD module), comprising: a display floater (for example display panels (liquid crystal display panel)); One first printed circuit board (PCB), it is connected to this display floater, this first printed circuit board (PCB) has a connector, and wherein this connector is to have the plastic cement element that several are electrically connected pin, in order to a separable interface to be provided between this printed circuit board (PCB) and another printed circuit board (PCB); With, one second printed circuit board (PCB), it is connected to this display floater, this second printed circuit board (PCB) comprises a sandwich layer, this sandwich layer has a main body and a branched portion that is formed by this Subject Extension, this branched portion has a terminal part, conducting channel is located at least one surface in this sandwich layer main body upper surface and the lower surface, and many conductive lead wires are located at least one surface in this sandwich layer branched portion upper surface and the lower surface, wherein the first end of these many conductive lead wires is electrically connected to this conducting channel, the second end of these many conductive lead wires is located on the terminal part of this branched portion, wherein the terminal part of this branched portion with and on many conductive lead wire the second ends be to be plugged in the connector of this first printed circuit board (PCB).

Above-mentioned flat-panel screens mainly comprises a display pannel, one has first printed circuit board (PCB) of branched portion, second printed circuit board (PCB) that is provided with connector, and be connected in a plurality of winding bearing-type packaging systems (TCP) between this two printed circuit board (PCB) and the display pannel.Particularly, this winding bearing-type packaging structure is to comprise data-driven integrated circuit (data drive IC) or grid-driving integrated circuit (gate drive IC); And this first printed circuit board (PCB) has the terminal part that many conductive lead wires are located at its branched portion.It should be noted that, the terminal part of this first printed circuit board (PCB) branched portion (comprising conductive lead wire provided thereon) is directly to be plugged in the connector of this second printed circuit board (PCB), does not need pliable printed circuit in view of the above and still can provide physics and electrical connection between this two printed circuit board (PCB).

In addition, according to a kind of printed circuit board (PCB) of the present invention, comprising: a sandwich layer, this sandwich layer have a main body and a branched portion that is formed by this Subject Extension, and this branched portion has a terminal part; This sandwich layer has a upper surface and a lower surface, many conductive lead wires are located at a surface in this sandwich layer branched portion upper surface and the lower surface, surface with the surperficial heteropleural mutually at many conductive lead wire places in the upper surface of this sandwich layer and the lower surface is a first surface, and the surface that is positioned at homonymy with the surface at many conductive lead wire places is a second surface; One first conducting channel is located at the first surface of this sandwich layer main body; One second conducting channel is located at the second surface of this sandwich layer main body, and this second conducting channel is electrically connected to this first conducting channel; The first end of these many conductive lead wires is electrically connected to this first conducting channel, the second end of these many conductive lead wires is located on the terminal part of this branched portion, the second end of these many conductive lead wires is used to be electrically connected to a connector, wherein this connector is to have the plastic cement element that several are electrically connected pin, in order to a separable interface to be provided between this printed circuit board (PCB) and another printed circuit board (PCB); A ground floor solder mask is covered in the first surface of this first conducting channel and this sandwich layer, makes that the branched portion surface of this sandwich layer is to be exposed to this ground floor solder mask; And a second layer solder mask is covered in the second surface of these many conductive lead wires, second conducting channel and this sandwich layer, makes the terminal part of this branched portion and the second end of many conductive lead wires not cover for this second layer solder mask.

Description of drawings

In order to make above-mentioned and other purposes of the present invention, feature and advantage more obvious, below especially exemplified by preferred embodiment of the present invention, and conjunction with figs. elaborates.

Fig. 1: the top view of conventional liquid crystal module, one first printed circuit board (PCB) shown in it is provided with a pliable printed circuit and one second printed circuit board (PCB) is provided with a connector;

The top view of the LCD module of Fig. 2: Fig. 1, this first printed circuit board (PCB) shown in it utilize a pliable printed circuit to be connected to connector on second printed circuit board (PCB);

Fig. 3: according to the top view of the LCD module of preferred embodiment of the present invention, one first printed circuit board (PCB) shown in it has integrated branched portion and one second printed circuit board (PCB) is provided with a connector;

Fig. 4: according to the following view of the LCD module of Fig. 3 of the present invention, this first printed circuit board (PCB) shown in it utilizes its branched portion to be connected to connector on second printed circuit board (PCB);

Fig. 5: according to the top view of the printed circuit board (PCB) with one-body molded branched portion of preferred embodiment of the present invention; With

Fig. 6: along the cross section view of the 6-6 line of Fig. 5.

Description of reference numerals:

100 conventional liquid crystal modules

110 display panels

112 top glass substrate, 114 lower glass substrate

120 winding bearing-type packaging structures

The 120a grid-driving integrated circuit

120b data drive integrated circult

130 printed circuit board (PCB)s, 140 printed circuit board (PCB)s

150 pliable printed circuits, 160 connectors

200 printed circuit board (PCB)s, 210 sandwich layers

210a main body 210b branched portion

230 conducting channels, 240 conducting channels

250 conductive lead wire 250a first ends

The 250b the second end

260 solder masks, 270 solder masks

300 LCD module, 310 printed circuit board (PCB)s

Embodiment

Fig. 5 and Figure 6 shows that the printed circuit board (PCB) 200 of the preferred embodiment according to the present invention, it mainly comprises a sandwich layer 210 and a branched portion 210b who is formed by this Subject Extension with a main body 210a.The upper surface of the main body 210a of this sandwich layer 210 is provided with a conducting channel 230, or the lower surface of this main body 210a is provided with a conducting channel 240.This conducting channel 230 can not be electrically connected to this conducting channel 240 by a plurality of plated-through-holes (plated through hole) (being shown among the figure).The upper surface of the branched portion 210b of this sandwich layer 210 is provided with many conductive lead wires 250.The first end 250a of these many conductive lead wires 250 is electrically connected to this conducting channel 230, and the second end 250b then is located on the terminal part (terminal portion) of this branched portion 210b and is used to be electrically connected to a connector.The lower surface of the main body 210a of this sandwich layer 210 (comprising conducting channel 240) is covered by one deck solder mask (soldermask) 260, and wherein the branched portion 210b surface exposure of this sandwich layer 210 is in this solder mask 260.Except the second end 250b of the terminal part of this branched portion 210b and many conductive lead wires, the upper surface of this sandwich layer 210 (remainder and the conducting channel 230 that comprise many conductive lead wires 250) is covered by one deck solder mask 270.

Fig. 3 and Fig. 4 illustrate a kind of flat-panel screens of utilizing printed circuit board (PCB) 200 of the present invention, and for example LCD module 300.This printed circuit board (PCB) 200 is to be connected to a display panels 110 by a plurality of winding bearing-type packaging structures (TCP) 120.Therefore, conducting channel 230 (not being shown among Fig. 3 and Fig. 4) at least a portion on this printed circuit board (PCB) 200 is that design is connected to a winding bearing-type packaging structure (TCP).This display panels 110 mainly is to comprise a top glass substrate 112, a lower glass substrate 114 and a liquid crystal layer (not being shown among the figure) that is located between this substrate 112,114.Be understandable that top glass substrate 112 can be so-called colored filter substrate (CFsubstrate), and lower glass substrate 114 is so-called membrane transistor substrate (TFTsubstrate).This winding bearing-type packaging structure generally is to comprise the drive integrated circult (drive IC) that utilizes coil type to engage the encapsulation of (tapeautomated bonding (TAB)) technology automatically.This drive integrated circult (drive IC) can be grid-driving integrated circuit (gate drive IC) or data-driven integrated circuit (data drive IC).According to printed circuit board (PCB) 200 of the present invention, generally be to be used for being electrically connected, so it also can be described as grid board (gate board) with grid-driving integrated circuit 120a.Therefore, to have a part at least be that design is electrically connected to a grid-driving integrated circuit 120a to the conducting channel 230 (not being shown among Fig. 3 and Fig. 4) on this printed circuit board (PCB) 200.And another printed circuit board (PCB) 310 generally is to be used for being electrically connected with data-driven integrated circuit 120b, so it also can be described as source plates (source board).Printed circuit board (PCB) 310 also is to be connected to display panels 110 by winding bearing-type packaging structure (TCP) 120.This printed circuit board (PCB) 310 is provided with a for example pliability connector (FPC connector) 160 of a connector.Connector 160 generally is to have several electrical connections (electrical contact), for example be electrically connected the plastic cement element of pin or electrical connection contact, and these electrical connections generally is directly to be welded on the printed circuit board (PCB) 310.In the present invention, connector is in order to a separable interface to be provided between two printed circuit board (PCB)s.

Referring to Fig. 4, these a plurality of winding bearing-type packaging structures (TCP) the 120th along the curved edge of this LCD module 300, make printed circuit board (PCB) 200,310 turn to the behind of this LCD module 300.At this moment, the terminal part of this printed circuit board (PCB) 200 branched portion 210b (comprising conductive lead wire the second end provided thereon) is directly to be plugged on the connector that is located on another printed circuit board (PCB), does not need pliable printed circuit in view of the above and still can provide physics and electrical connection between this two printed circuit board (PCB).

Therefore, one of them is when adopting design of the present invention when the grid board of LCD module or source plates, but this grid board direct physical and be electrically connected to source plates and need do not use extra pliable printed circuit.According to innovative design of the present invention, it is except can reducing required pliable printed circuit material cost, also can exempt follow-up SMT welding and test processing procedure, significantly shorten and make the required production time (cycle time) of LCD module, and can be lifted out productive rate (yield rate).Discuss in detail though The present invention be directed to the printed circuit board (PCB) that is used for LCD module, yet the present invention can be applicable to the flat-panel screens that comprises at least two circuit boards of all kinds.Though with aforementioned preferred embodiment explanation, it is not to be used to limit the present invention in the present invention, any those of ordinary skill in the art without departing from the spirit and scope of the present invention, can do various changes and modification.Though the printed circuit board (PCB) with branched portion for example according to the present invention only is used to replace and traditional cuts open pole plate and as preferred embodiment, also can design and replace traditional source plates.Therefore protection scope of the present invention is defined by the scope of accompanying Claim.

Claims

1. A printed circuit board, comprising:

a core layer having a main body and a branch extending from the main body, the branch having a terminal portion;

a conductive circuit is provided on at least one of the upper and lower surfaces of the core body; and

A plurality of conductive leads are arranged on at least one of the upper surface and the lower surface of the core layer bifurcated part, the first ends of the plurality of conductive leads are electrically connected to the conductive circuit, and the second ends of the plurality of conductive leads part is provided on the terminal part of the bifurcated part, by means of which the terminal part of the bifurcated part is inserted into a connector, the second ends of the plurality of conductive leads can be electrically connected to the connector, wherein the connector It is a plastic component with several electrical connection contacts to provide a detachable interface between the printed circuit board and another printed circuit board.

2. The printed circuit board of claim 1, wherein at least a portion of the conductive circuit is for connection to a tape-on-reel packaging device.

3. The printed circuit board of claim 1, wherein at least a portion of the conductive circuit is used to electrically connect to a driver integrated circuit.

4. The printed circuit board of claim 1, wherein at least a portion of the conductive circuit is for electrically connecting to a gate driver integrated circuit.

5 . The printed circuit board according to claim 1 , wherein the total thickness of the core layer and the conductive leads meets the allowable thickness specification of the connector. 6 .

6. A flat panel display comprising:

a display panel;

A first printed circuit board connected to the display panel, the first printed circuit board has a connecting piece, wherein the connecting piece is a plastic component with several electrical connection contacts for connecting the printed circuit board with another providing a separable interface between printed circuit boards; and

a second printed circuit board connected to the display panel, the second printed circuit board includes a core layer having a main body and a branch extending from the main body, the branch having a In the terminal part, a conductive circuit is arranged on at least one surface of the upper surface and the lower surface of the core body, and a plurality of conductive leads are arranged on at least one surface of the upper surface and the lower surface of the core branch part, wherein the plurality of a first end of a conductive lead is electrically connected to the conductive circuit, and a second end of the plurality of conductive leads is provided on the terminal portion of the branch portion,

Wherein the terminal portion of the bifurcated portion and the second ends of the plurality of conductive leads thereon are inserted into the connectors of the first printed circuit board.

7. The flat panel display according to claim 6, wherein the connecting member is a flexible connecting member.

8 . The flat panel display according to claim 6 , wherein the first printed circuit board and the second printed circuit board are connected to the display panel through a tape-and-reel packaging device.

9. The flat panel display according to claim 8, wherein the tape-and-reel packaging device connected between the first printed circuit board and the display panel includes a data driver integrated circuit, and the connected to the second printed circuit board The tape-and-reel packaging device between the display panel includes a gate driver integrated circuit.

10. The flat panel display according to claim 8, wherein the tape-and-reel packaging device connected between the first printed circuit board and the display panel comprises a gate driver integrated circuit, and the connected to the second printed circuit A tape-and-reel package between the board and the display panel includes a data-driven integrated circuit.

11. The flat panel display according to claim 6, wherein a conductive circuit is arranged on the upper surface and the lower surface of the core body, and a plurality of conductive leads are arranged on the upper surface and the lower surface of the core bifurcation part. On one surface, the conductive circuit of the second printed circuit board includes a first conductive circuit provided on the first surface of the upper surface and the lower surface of the core body on a side different from the surface where the plurality of conductive leads are located, and A second conductive circuit provided on the second surface on the same side as the surface where the plurality of conductive leads are located among the upper surface and the lower surface of the core body, wherein the second conductive circuit is electrically connected to the first conductive circuit , and the second printed circuit board also includes a first layer of solder resist covering the first conductive circuit and the first surface of the core layer, so that the surface of the bifurcation portion of the core layer is exposed to the first layer of resist A soldering layer, and a second layer of solder resist cover the plurality of conductive leads, the second conductive circuit and the second surface of the core layer, so that the terminal portion of the bifurcation and the second end of the plurality of conductive leads Not covered by this second layer of solder mask.

12. The flat panel display of claim 6, wherein the display panel is a liquid crystal display panel.

13. A printed circuit board comprising:

A core layer, the core layer has a main body and a bifurcated portion extending from the main body, the bifurcated portion has a terminal portion; the core layer has an upper surface and a lower surface, and a plurality of conductive leads are arranged on One of the upper surface and the lower surface of the bifurcation part of the core layer, the surface of the upper surface and the lower surface of the core layer that is different from the surface where the multiple conductive leads are located is the first surface, and the surface where the multiple conductive leads are located is the first surface. The surface on the same side as the surface is the second surface;

a first conductive circuit is disposed on the first surface of the core body;

a second conductive circuit is disposed on the second surface of the core body, the second conductive circuit is electrically connected to the first conductive circuit;

The first ends of the plurality of conductive leads are electrically connected to the first conductive circuit, the second ends of the plurality of conductive leads are arranged on the terminal portion of the branch portion, and the second ends of the plurality of conductive leads for electrical connection to a connector, wherein the connector is a plastic element having electrical connection contacts for providing a separable interface between the printed circuit board and another printed circuit board;

A first layer of solder resist covers the first conductive circuit and the first surface of the core layer, so that the surface of the bifurcation portion of the core layer is exposed to the first layer of solder resist layer; and

A second layer of solder resist covers the plurality of conductive leads, the second conductive circuit and the second surface of the core layer, so that the terminal portion of the bifurcation portion and the second ends of the plurality of conductive leads are not the first Two layers of solder mask coverage.

14. The printed circuit board of claim 13, wherein at least a part of the first conductive circuit or the second conductive circuit is used for connecting to a tape-on-reel packaging device.

15. The printed circuit board according to claim 13, wherein at least a part of the first conductive circuit or the second conductive circuit is used to electrically connect to a driver integrated circuit.

16. The printed circuit board according to claim 13, wherein at least a part of the first conductive circuit or the second conductive circuit is electrically connected to a gate driving integrated circuit.

17 . The printed circuit board according to claim 13 , wherein the total thickness of the core layer and the conductive leads meets the allowable thickness specification of the connector. 18 .