Chip package circuit board module

A chip package circuit board module includes a circuit board and an original chip. The circuit board includes a first pad and a second pad disposed besides the first pad and separated from the first pad. The original chip is connected to the first pad and the second pad. A width of the original chip is W1, a total width of the first pad is P1, and a total width of the second pad is P2. The total width P1 of the first pad is larger than twice of the width W1 of the original chip, and the total width P2 of the second pad is larger than twice of the width W1 of the original chip.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a circuit board module, and particularly relates to a chip package circuit board module.

Description of Related Art

Generally, a circuit board module of a light-emitting diode (LED) chip is to package the LED chip on a circuit board. However, when the LED chip is damaged, the package is failed, or the LED chip cannot emit light due to other reasons, it is required to disassemble the LED chip to clean pads on the circuit board, and sometimes re-soldering is required, and then a new LED chip is packaged.

However, the aforementioned rework process probably encounters following problems: when the LED chip is stripped, copper lines on a surface of the circuit board are probably stripped together; a high temperature is probably applied during the process of stripping the LED chip, though under a high temperature environment, the circuit board may have unexpected expansion or shrink, which probably damages the circuit board, such that reliability of the circuit board is decreased; when the LED chip is stripped, the pads on the circuit board are probably damaged, and the new LED chip packaged at the same position probably has a problem of yield reduction.

SUMMARY OF THE INVENTION

The invention is directed to a chip package circuit board module, where a substitution chip is adapted to be quickly and easily configured on the circuit board to achieve a high yield.

The invention provides a chip package circuit board module including a circuit board and an original chip. The circuit board includes a first pad and a second pad. The second pad is disposed besides the first pad and separated from the first pad. The original chip is connected to the first pad and the second pad. A width of the original chip is W1, a total width of the first pad is P1, and a total width of the second pad is P2. The total width P1 of the first pad is larger than twice of the width W1 of the original chip, and the total width P2 of the second pad is larger than twice of the width W1 of the original chip.

In an embodiment of the invention, the total width P1 of the first pad and the total width P2 of the second pad are respectively between 2.1 and 2.5 times of the width W1 of the original chip.

In an embodiment of the invention, the chip package circuit board module further includes N substitution chips, which are connected to the first pad and the second pad in parallel with the original chip, where N≥1, a width of each of the substitution chips is W2, and a distance between the original chip and the closest substitution chip is D, then P1≥W1+N(W2+D), and P2≥W1+N(W2+D).

In an embodiment of the invention, the distance D between the original chip and the closest substitution chip is between 0.1 and 0.5 times of the width W1 of the original chip.

In an embodiment of the invention, the first pad includes a plurality of first branch portions connected to each other, and the second pad includes a plurality of second branch portions connected to each other, a position where the original chip is connected to the first pad is one of the first branch portions, and a position where the original chip is connected to the second pad is one of the second branch portions, the total width P1 of the first pad is a sum of widths of the first branch portions, and the total width P2 of the second pad is a sum of widths of the second branch portions.

In an embodiment of the invention, the chip package circuit board module further includes a substitution chip connected to another one of the first branch portions and another one of the second branch portions.

In an embodiment of the invention, the second pad includes a plurality of second branch portions connected to each other, a position where the original chip is connected to the second pad is one of the second branch portions, and the total width P2 of the second pad is a sum of widths of the second branch portions.

In an embodiment of the invention, the chip package circuit board module further includes a substitution chip connected to the first pad and another one of the second branch portions.

According to the above description, in the chip package circuit board module of the invention, by designing the total width P1 of the first pad of the circuit board to be greater than twice of the width W1 of the original chip, and designing the total width P2 of the second pad to be greater than twice of the width W1 of the original chip, when the original chip cannot work, the substitution chip can be directly configured beside the original chip to connect the first pad and the second pad. Namely, the first pad and the second pad respectively preserve a width for connecting the substitution chip. In this way, it is unnecessary to disassemble the original chip during rework, and working procedure of the rework is effectively simplified.

DESCRIPTION OF EMBODIMENTS

FIG. 1is a schematic diagram of a chip package circuit board module according to an embodiment of the invention. Referring toFIG. 1, the chip package circuit board module100of the present embodiment includes a circuit board110and a plurality of original chips120. The circuit board110includes a plurality of first pads112and a plurality of second pads115. In the present embodiment, the original chips120are, for example, light-emitting diode (LED) chips, though the type of the original chips120is not limited thereto. Moreover, in the present embodiment, numbers of the original chips120, the first pads112and the second pads115are, for example, respectively three, though the numbers of the original chips120, the first pads112and the second pads115are not limited thereto. According toFIG. 1, the first pads112are connected through a connection portion111, though in other embodiments, the first pads112can also be separated from each other according to an actual requirement.

The second pads115are respectively disposed besides the first pads112and separated from the first pads112. As shown inFIG. 1, each of the original chips120is connected to the corresponding first pad112and the corresponding second pad115, where a width of the original chip120is W1, a width of the first pad112is P1, and a width of the second pad115is P2. According toFIG. 1, it is known that the width P1 of the first pad112is larger than twice of the width W1 of the original chip120, and the width P2 of the second pad115is larger than twice of the width W1 of the original chip120.

Under some states, if the original chip120cannot work, the chip package circuit board module100requires to be repaired. In the present embodiment, the first pad112and the second pad115respectively preserve a width for connecting a substitution chip130. Therefore, during the maintenance, the original chip120is unnecessary to be disassembled, and a maintenance man may directly allocates the substitution chip130beside the original chip120for connecting the first pad112and the second pad115, so as to effectively simplify a working procedure of the rework.

In the present embodiment, the chip package circuit board module100may include the substitution chips130, which are connected to the first pads112and the second pads115in parallel with the original chips120. InFIG. 1, in order to schematically indicate a width relationship of the first pads112, the second pads115and the original chips120, the original chips120are indicated by solid lines, and the substitution chips130are indicated by dot lines. Therefore, inFIG. 1, the number of the substitution chips130can be the same to the number of the original chips120. Namely, each of the first pads112and each of the second pads115used for electrically connecting the original chip120preserve a position for connecting the substitution chip130.

Moreover, the positions preserved by the first pad112and the second pad115for connecting the substitution chips130in the future can be more than one. For example, the positions preserved by the first pad112and the second pad115for connecting the substitution chips130in the future can be two or more. The width P1 of the first pad112and the width P2 of the second pad115can be adjusted according to the number of the substitution chips130to be connected to the first pad112and the second pad115.

If the number of the substitution chips130to be connected to the first pad112and the second pad115is N, where N≥1, the width of each of the substitution chips130is W2. A chip implanting distance has to be preserved between every two adjacent chips to facilitate operation and avoid friction of the two chips, and it is assumed that a distance between the original chip120and the closest substitution chip130is D, then P1≥W1+N(W2+D), and P2≥W1+N(W2+D). Namely, the width P1 of the first pad112is greater than or equal to the width W1 of the original chip120plus N times a sum of the width W2 of the substitution chip130that can be connected in the future and the distance D between two adjacent chips. Similarly, the width P2 of the second pad115is greater than or equal to the width W1 of the original chip120plus N times a sum of the width W2 of the substitution chip130that can be connected in the future and the distance D between two adjacent chips.

In the present embodiment, the distance D between the original chip120and the closest substitution chip130is between 0.1 and 0.5 times of the width W1 of the original chip or the width W2 of the substitution chip130. Therefore, regarding the width P1 of the first pad112and the width P2 of the second pad115that are suitable for connecting only one substitution chip130, the width P1 of the first pad112and the width P2 of the second pad115can be respectively between 2.1 and 2.5 times of the width W1 of the original chip120. Certainly, a designer may adjust a magnitude of the distance D according to an actual requirement and a spatial configuration on the circuit board110, and the magnitude of the distance D is not limited thereto.

It should be noted that inFIG. 1, although the circuit board110respectively has three sets of the first pads112and the second pads115located on the top, the bottom and in the middle, and the widths of the first pads112of different sets are the same, and the widths of the second pads115of different sets are the same, in other embodiments, the widths of the first pads112of different sets can also be different, and the widths of the second pads115of different sets can also be different.

The chip package circuit board modules of other patterns are described below, and it should be noted that in the following embodiment, the components that are the same or similar with that of the aforementioned embodiment are denoted by the same referential numbers, and details thereof are not repeated, and only differences between different embodiments are described.

FIG. 2is a schematic diagram of a chip package circuit board module according to another embodiment of the invention. Referring toFIG. 2, a main difference between the chip package circuit board module100aofFIG. 2and the chip package circuit board module100ofFIG. 1is that shapes and configuration positions of the first pads112aand the second pads115aof the present embodiment are different. Similarly, in the chip package circuit board module100aof the present embodiment, the first pad112aof the circuit board110adopts the width P1 that is greater than twice of the width W1 of the original chip120, and the second pad115aadopts the width P2 that is greater than twice of the width W1 of the original chip120, and when the original chip120cannot work, it is unnecessary to disassemble the original chip120, but the substitution chip130can be directly connected to the first pad112aand the second pad115ato substitute the original chip120to work as long as the first pad112aand the second pad115apreserve enough widths P1 and P2, and the shapes and configuration positions of the first pads112aand the second pads115aare not limited thereto.

FIG. 3is a schematic diagram of a chip package circuit board module according to another embodiment of the invention. Referring toFIG. 3, three sets of the first pads212and the second pads215located on the top, the bottom and in the middle are illustrated, and a main difference between the chip package circuit board module200ofFIG. 3and the chip package circuit board module100ofFIG. 1is that in the present embodiment, each of the first pads212includes a plurality of first branch portions213connected to each other, and each of the second pads215includes a plurality of second branch portions216connected to each other. A total width of the first pad212is a sum of widths B1 of the first branch portions213, and a total width of the second pad215is a sum of widths B2 of the second branch portions216. The width131of each of the first branch portions213and the width B2 of each of the second branch portions216are greater than or equal to the width W1 of the original chip120, and are greater than or equal to the width W2 of the substitution chip130.

To be more specific, in the three sets of the first pads212ofFIG. 3, each of the first pads212includes two first branch portions213connected to each other, and each of the second pads215includes two second branch portions216connected to each other. A position where the original chip120is connected to the first pad212is one of the first branch portions213, and a position where the original chip120is connected to the second pad215is one of the second branch portions216, and when the original chip120cannot work, it is unnecessary to disassemble the original chip120, but the substitution chip130can be directly connected to another first branch portion213and another second branch portion216. Certainly, the number of the first branch portions213of each first pad212is not limited to two, and the number of the second branch portions216of each second pad215is neither limited to two, and in other embodiments, the number of the first branch portions213of each first pad212and the number of the second branch portions216of each second pad215can be three or more, which is determined by a space on the circuit board110and the number of the substitution chips130to be preserved.

FIG. 4is a schematic diagram of a chip package circuit board module according to another embodiment of the invention. Referring toFIG. 4, configuration of the first pads212aand the second pads215aof the chip package circuit board module200aofFIG. 4is similar to the configuration of the first pads112aand the second pads115aof the chip package circuit board module100aofFIG. 2. A main difference between the chip package circuit board module200aofFIG. 4and the chip package circuit board module100aofFIG. 2is that the second pad215aincludes a plurality of second branch portions216aconnected to each other, the original chip120is connected to the first pad212a, a position where the original chip120is connected to the second pad215ais one of the second branch portions216a, and a total width of the second pad215ais a sum of the widths B2 of the second branch portions216a. Similarly, when the original chip120cannot work, it is unnecessary to disassemble the original chip120, but the substitution chip130can be directly connected to the first pad212aand another second branch portion216a, and the substitution chip130may substitute the original chip120to work.

Moreover, comparing the chip package circuit board module200aofFIG. 4with the chip package circuit board module200ofFIG. 3, the first pad212adoes not have any branch portion, and in other embodiments, a combination that the first pad212has the first branch portions213similar to the embodiment ofFIG. 3and the second pad115adoes not have any branch portion similar to the embodiment ofFIG. 2can also be adopted, and the shapes of the first pads212aand the second pads215aare not limited to the aforementioned description as long as the total width of the first pad212ais greater than twice of the width W1 of the original chip120and the total width of the second pad215ais greater than twice of the width W1 of the original chip120and the first pad and the second pad212aand215aare suitable for connecting the original chip120and the substitution chip130.

In summary, in the chip package circuit board module of the invention, by designing the total width P1 of the first pad of the circuit board to be greater than twice of the width W1 of the original chip, and designing the total width P2 of the second pad to be greater than twice of the width W1 of the original chip, when the original chip cannot work, the substitution chip can be directly configured beside the original chip to connect the first pad and the second pad. Namely, the first pad and the second pad respectively preserve a width for connecting the substitution chip. In this way, it is unnecessary to disassemble the original chip during rework, and working procedure of the rework is effectively simplified.