CN103547060A - Flexible circuit board used for liquid crystal module with backlight source - Google Patents

Abstract

The invention discloses a flexible circuit board used for a liquid crystal module with a backlight source. The flexible circuit board comprises an element area, a bending area and a welding end, one side of the element area extends outwards to form the bending area, the welding end is formed at one end, away from the element area, of the bending area, and the bending area comprises a laminating layer, a first glue layer, a copper foil layer, a second glue layer and a substrate layer which are sequentially arranged. Thickness of the bending area is reduced by reducing structure of the bending area to improve flexure degree of the bending area, lower stress action at a bent position and improve flexibility of the flexible circuit board, so that backlight failure caused by circuit breakdown in the process of use is improved.

Description

Flexible circuit board for the liquid crystal module with backlight

Technical field

The present invention relates to a kind of flexible circuit board for the liquid crystal module with backlight.

Background technology

As everyone knows, along with the progress in epoch, the fast development of electronic information technology industry, people are more and more higher to the requirement of the electronic products such as mobile phone, learning machine, and industry competition is also more and more fierce.For the competitiveness of improving product is met consumers' demand, the monnolithic case of electronic product certainly will be to lighier less thinner future development, and the space that corresponding liquid crystal module is occupied in whole product also reduces gradually, compactness.What backlight mainly adopted with whole module is that the mode bending with Flexible Printed Circuit is connected, and for conserve space bends in the module back side more, and when bending, makes its bending region as far as possible little.For guaranteeing that module normally shows, avoid losing efficacy because of the backlight that Flexible Printed Circuit fracture causes, this just mean Flexible Printed Circuit need to be in less space crooked 180 degree, so for Flexible Printed Circuit degree of deflection require self-evident.

As accompanying drawing 1 general structure that is existing flexible circuit board, Fig. 2 is that Fig. 1 is along A-A cross-sectional view, Fig. 3 is a portion structure for amplifying schematic diagram in Fig. 2, the bent area of this flexible circuit board is successively by the first coating layer 21, the first glue-line 22, copper foil layer 23, the second glue-line 24, substrate layer 25, the 3rd glue-line 26 and the second coating layer 27 form, Fig. 4 is the state of this flexible circuit board when bending, obviously, bent area stress when bending mainly concentrates on b place, because wiring board thickness directly affects the hardness of wiring board, thickness is different, under bending state, the stress at b place can be different, wiring board hardness is excessively strong, degree of deflection causes rupture of line not, thereby cause inefficacy backlight.

Summary of the invention

In order to overcome above-mentioned defect, the invention provides a kind of flexible circuit board for the liquid crystal module with backlight, this flexible circuit board improves in use by reducing the mode of folding s tress the inefficacy backlight that fractures and cause because of circuit occurring.

The present invention for the technical scheme that solves its technical problem and adopt is: a kind of flexible circuit board for the liquid crystal module with backlight, comprise that element region, this element region one epitaxial lateral overgrowth stretch the bent area of formation and be formed at this bent area away from the welding ends of described element region one end, described bent area comprises coating layer, the first glue-line, copper foil layer, the second glue-line and the substrate layer being arranged in order.

As a further improvement on the present invention, described element region is square, and this element region is provided with several LED.

As a further improvement on the present invention, described element region and welding ends are double-decker, and described bent area is single layer structure.

The invention has the beneficial effects as follows: by reducing bending region structure, reduce its thickness, to improve bent area degree of deflection, reduce bending place effect of stress, increase its flexibility, and then improve the inefficacy backlight that fractures and cause because of circuit in use occurring.

Accompanying drawing explanation

Fig. 1 is existing flexible circuit board structural representation;

Fig. 2 is A-A cross-sectional view in Fig. 1;

Fig. 3 is a portion structure for amplifying schematic diagram in Fig. 2;

Fig. 4 is that existing flexible circuit board is used status architecture schematic diagram;

Fig. 5 is flexible circuit board structural representation of the present invention;

Fig. 6 is B-B cross-sectional view in Fig. 4;

Fig. 7 is c portion structure for amplifying schematic diagram in Fig. 2;

Fig. 8 is that flexible circuit board of the present invention is used status architecture schematic diagram.

Embodiment

As shown in Fig. 5,6,7, a kind of flexible circuit board for the liquid crystal module with backlight, comprise that element region 1, this element region one epitaxial lateral overgrowth stretch the bent area 2 of formation and be formed at this bent area away from the welding ends 3 of described element region one end, described bent area comprises coating layer 21, the first glue-line 22, copper foil layer 23, the second glue-line 24 and the substrate layer 25 being arranged in order.Like this, by improving bending region structure, form, to reach, reduce bent area thickness, its use state as shown in Figure 8, can be found out, the stress of this flexible circuit board mainly concentrates on d place, as obviously different in the thickness at the b place in accompanying drawing 4 from existing flexible circuit board, this flexible circuit board has reduced its hardness in bent area, make bent area more soft, reduced effect of stress, effectively improved the backlight causing because of fractureing of wiring board and lost efficacy.

Preferably, said elements district is square, and this element region is provided with several LED4.

Preferably, said elements district and welding ends are double-decker, and described bent area is single layer structure.

Claims (3)

1. the flexible circuit board for the liquid crystal module with backlight, comprise that element region (1), this element region one epitaxial lateral overgrowth stretch the bent area (2) of formation and be formed at this bent area away from the welding ends (3) of described element region one end, it is characterized in that: described bent area comprises coating layer (21), the first glue-line (22), copper foil layer (23), the second glue-line (24) and the substrate layer (25) being arranged in order.

2. the flexible circuit board for the liquid crystal module with backlight according to claim 1, is characterized in that: described element region is square, and this element region is provided with several LED(4).

3. the flexible circuit board for the liquid crystal module with backlight according to claim 1 and 2, is characterized in that: described element region and welding ends are double-decker, and described bent area is single layer structure.

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