Circuit board structure of integrated optoelectronic componenet

A circuit board structure of integrated optoelectronic components is composed of: a carrying board with at least one through opening; a first optoelectronic component accommodated in the through opening, which has an active surface and a non-active surface. A dielectric layer, a circuit layer and build-up layers are successively formed on the active surface of the optoelectronic component and the carrying board. A first opening penetrates the dielectric layer and the circuit layer while a second opening penetrates the build-up layers. The present invention provides that the circuit layer is directly formed on the surface of the first optoelectronic component so that the registration between the circuit layer and the electrode pads of the optoelectronic component is improved. Moreover, the optical transmission component for transmitting signal is integrated in the build-up circuit layer. Thus, the cost is reduced, the production is improved and the volume is shrunken.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 USC 119 of Taiwan Application No. 094136111, filed on Oct. 17, 2005.

FIELD OF THE INVENTION

The present invention relates to circuit board structures of integrated optoelectronic component, and more particularly, to a circuit board structure that has been integrated with optoelectronic component, optical transmission component, and circuit structure.

BACKGROUND OF THE INVENTION

As the technological development of semiconductors advances, demands for miniaturized packaging and larger data storage capacity have also intensified along the way. In addition to that, because the data processing capacity is constantly increasing, if data units of the same size can be processed at the fastest speed possible in a given unit of time, then data can be processed more efficiently. The most straightforward method for raising the processing speed of semiconductors is to increase its usage frequency, but when clock rates more then Gb/s, problems like power dissipation, signal time delay, and electromagnetic interference (EMI) also arise, which will impede the production of semiconductors with high performance. This problem has been made even more severe because the traditional medium for data signal transfer is copper circuit, which cannot achieve higher conductivity due to its intrinsically limited conducting property, thus its signal transmission speed cannot be elevated by the method of increasing its conductivity.

Moreover, the signal transmission structure made of metal circuits is more susceptible to the interference of external noises or internal circuits during signal transmitting, which in turn leads to erroneous signals being transferred. Therefore, the signal transmitting structure has to be equipped with adequate protective measures to prevent the interference mentioned above from affecting signals, and this phenomenon is especially obvious in high-frequency application. The protective measures will result in increased difficulty to the designs of circuit and additional structures, which will in turn raise the costs of design and production, and cannot improve the current situation.

The traditional method of signal transmitting is analog signal transmission, which works by charging conductor with electrical currents, but the current method for processing signals inside circuits is the digital processing method, which can easily distort signals when one type of signal is converted to the other during signal transfer.

In order to resolve the disadvantages resulted from the traditional method of analog signal transmission, the new technology uses optical signal to replace electrical signal for signal transmission, and the most palpable advantage by such change is better quality in signal transmission, since the optical signal is almost unsusceptible to interference of electromagnetic waves and is thus not distorted as much. As a result, there is no need to design a structure for preventing the interference of electromagnetic waves, and this helps reduce the costs of design and production. Therefore, using optical signal for signal transmission has become the main aim for future development.

In the prior arts, the optical signal transmission requires signal processing components such as optical fibers, optical connectors, optical/electrical converters, and electrical/optical converters for digital data transfer to proceed, but optical alignment system of high precision is large in size and hence can hamper the developmental trend of miniaturization.

FIG. 1is a cross-sectional view showing the circuit board of U.S. Pat. No. 6,839,476, which utilizes optical fibers for signal transmission; wherein a core layer12is formed on the bottom layer11, and a plurality of grooves12aare formed on the core layer12; an optical fiber13is placed into the groove12a, then a top layer14is formed on core layer12, so that optical fiber13is embedded inside core layer12, and optical fiber13is made by enclosing a layer of cladding13baround a core13a. Optical transmitting and receiving modules or passive optical components can be disposed on both ends of optical fiber13, by which allows optical fiber13to transfer optical signals, and thus avoiding the disadvantages resulted from electrical signal transfer.

However, because optical fiber13needs to be embedded in groove12aof core layer12, the core layer12has to undergo the grooving process in prior to the above step, followed by the disposition of optical fiber13into groove12ato complete the overall production process. But the disposition of optical fiber13into groove12ais carried out mechanically, in other words, the method of mechanical insertion is employed to insert electronic components into circuit board in prior arts. As a result, the speed of production is slower and cannot reach the goal of fast production.

Moreover, optical fiber13needs to be cut in accordance with the length of groove12athat it faces beforehand, so that it can then be fit into groove12a; this adds an additional step in the overall production process, and hence raises the difficulty of the production process. On the other hand, the uneven length of optical fiber13also makes the classification step in the production process more complicated, thereby increasing overall production steps and raising its complication, and in turn results in increased production costs.

Because grooves12ahas to be formed on core layer12in order to accept optical fiber13, it is necessary to leave adequate interval spaces between each of the groove12awhile designing their size, so that optical fiber13can be fixed inside core layer12. But under the double influences of the size of interval space and the diameter of optical fiber13, the wiring density cannot be increased further.

Furthermore, the optical fiber13used to transfer optical signal is made by enclosing a layer of cladding13baround a core13a, wherein the inner layer of cladding13bcan serve as a reflective surface that allows the optical signals to be reflected forwardly and thereby achieving the goal of transmitting signals. However, optical fiber13and circuit board are two different structures and need to be made independently; afterwards, the two separately made products also have to be integrated. Both steps described above increase the difficulty of the overall production process as well as impede the attainment of mass production, and thus the production costs cannot be lowered further.

When precise alignment is carried out by the use of optical connector with optical fiber, the high precision aligning equipment is also required for the transfer of optical signal to proceed due to the lower performance of automatic production. In addition, it is also necessary to carry out aligning by manual labor, which leads to increased production costs and reduced productivity.

In addition, the semiconductor package of the prior arts is made by forming grooves inside it before implanting optical fibers, so it is necessary to leave adequate interval spaces between each of the groove while designing their size, so that optical fibers can be fixed inside the semiconductor package. But under the double influences of the size of interval space and the diameter of optical fiber, the wiring density cannot be further elevated, which also leads to more complicated and difficult production process, along with increased production costs.

Therefore, the most urgent issue for the industry is to provide an electronic device that can meet the demand of miniaturization and reduce loss of signal during signal transmitting, shorten conductivity pathway, and decrease noises; a circuit board integrated with optoelectronic components that can elevate signal transfer quality, increase registration, simplify production process, lower production costs, raise wiring density and productivity should also be provided.

SUMMARY OF THE INVENTION

In light of the drawbacks of the prior arts described above, the main objective of the present invention is to provide a circuit board structure of integrated optoelectronic components that can meet the demand of miniaturization for electronic devices.

Another objective of the present invention is to provide a circuit board structure of integrated optoelectronic components that can reduce signal loss during signal transfer, shorten conductivity pathway, decrease noises and elevate the quality of signal transfer.

Another objective of the present invention is to provide a circuit board structure of integrated optoelectronic components that can improve the alignment of optoelectronic component.

A further objective of the present invention is to provide a circuit board structure of integrated optoelectronic components that can simplify production process.

To achieve the above and other objectives, the present invention discloses a circuit board structure of integrated optoelectronic components, which is consisted of: a carrying board that has at least one opening; at least a first optoelectronic component that is disposed in the opening of the carrying board, and the first optoelectronic component has an active surface and a non-active surface opposite to the active surface, the active surface also has a plurality of electrode pads and optical active areas; a dielectric layer that is formed on the surface of the carrying board and the active surface of the first optoelectronic component, and a plurality of openings are formed in the dielectric layer to expose the electrode pads of the first optoelectronic component; a circuit layer that is formed on the surface of the dielectric layer, the circuit layer also forms conductive structures in the openings of the dielectric layer and electrically connects to the electrode pads of the first optoelectronic component; at least a build-up circuit layer structure that is formed on the surface of the dielectric layer that has a circuit layer, and it is electrically connected to the circuit layer; a first opening that penetrates the dielectric layer and the build-up circuit layer structure and a second opening that penetrates the build-up circuit layer structure, wherein the first opening is facing the optical active area on the active surface of the first optoelectronic component; as well as at least an optical transmission component that is embedded within the build-up circuit layer structure, one of the transmission ends of the optical transmission component is facing and exposed through the first opening, and is opposite to the optical active area of the first optoelectronic component, whereas the other transmission end is facing and exposed through the second opening.

An insulating layer is formed on the outer surface of the build-up circuit layer structure described above, and it has a plurality of openings to expose the parts of circuit layer on the outer surface of the build-up circuit layer structure that serve as electrical connecting pads. A second optoelectronic component is formed on top of the electrical connecting pads and electrically connected to them, and the optical active area on the active surface of the second optoelectronic component is facing and exposed through the second opening, it is also opposite to the other transmission end of the optical transmission component.

Moreover, the circuit board structure of integrated optoelectronic components of the present invention is further comprised of a heat dissipation board formed on the bottom surface of the carrying board.

Therefore, in the circuit board structure of integrated optoelectronic components of the present invention, at least a first optoelectronic component is embedded in the opening of the carrying board, then a dielectric layer, a circuit layer and build-up circuit layer structure are successively formed on the carrying board and the active surface of the first optoelectronic component, and a first opening that penetrates the dielectric layer and the build-up circuit layer structure is formed, while a second opening that penetrates the build-up circuit layer structure is also formed. At least an optical transmission component is embedded in the build-up circuit layer structure, and one of the transmission ends of the optical transmission component is facing and exposed through the first opening, so that it is opposite to the optical active area on the active surface of the optoelectronic component, thereby forming a circuit board structure of integrated optoelectronic components that is also embedded with at least an optoelectronic component and an optical transmission component. Because the circuit layer is electrically connected to the electrode pads of the first optoelectronic component directly, the alignment between the circuit and the first optoelectronic component is improved, thereby simplifying the production and increasing productivity.

In addition to that, optical transmission components are embedded into build-up circuit layer structure in the present invention, as a result, there is no need to form grooves for the disposition of optical transmission component in the circuit board structure of integrated optoelectronic components. Thus the optical transmission component can be directly embedded in the dielectric layer of build-up circuit layer structure during the formation of the build-up circuit layer structure, which also allows the production to be simplified and thereby reducing the production costs.

Additionally, the first optoelectronic component and the optical transmission component are embedded in the carrying board and build-up circuit layer structure respectively in the present invention. As a result, the size of product packaging is reduced and this enables the demand of miniaturization for electronic devices to be satisfied. On the other hand, problems like signal loss during signal transfer and occurrence of noises can also be reduced, and conductivity pathway can also be shortened, which leads to the improvement of the quality of signal transfer.

Furthermore, according to the present invention, the outer surface of the build-up circuit layer structure can be disposed with at least a second optoelectronic component. With regard to the optical active area on the active surface of the first optoelectronic component that is embedded in the carrying board, and the optical active area on the active surface of the second optoelectronic component that is disposed on the outer surface of the build-up circuit layer structure; both are facing the two transmission ends of the optical transmission component that is embedded under the build-up circuit layer structure. As a result, the signals of the first and the second optoelectronic components can be transmitted through the optical transmission component, thereby forming a modularized circuit board structure that is also integrated with optoelectronic components, which can satisfy the constantly rising demands regarding the quality of electronic products.

In addition, the bottom surface of the carrying board can be further disposed with a heat dissipation board, so that the heat produced from running the optoelectronic components embedded within the carrying board can be effectively dispelled by the heat dissipation board. Therefore, the reliability of the optoelectronic components is ensured and their durability can be extended.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates generally to a circuit board structure that has been integrated with optoelectronic component, optical transmission component, and circuit structure. The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications to the embodiments and the generic principles and features described herein will be readily apparent to those skilled in the art. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features described herein.

The invention has been described using exemplary embodiments; anyone who is familiar with the arts can easily comprehend other advantages and effects of the present invention by reading the disclosed content in this claim. Moreover, the present invention can also be implemented or applied by using other embodiments, and anyone can modify and adjust the details in this claim on the basis of different considerations or applications, provided that he or she does not depart from the purpose and scope of the present invention.

Referring toFIG. 2A, which depicts the schematic cross-sectional view of the circuit board structure of integrated optoelectronic components in accordance with the first embodiment of the present invention.

As indicated in the figure, the circuit board structure of integrated optoelectronic components is composed of: a carrying board20that has at least one through opening200; a first optoelectronic component21that has at least an active surface210and a non-active surface211opposite to the active surface, and it is located in opening200of carrying board20; a dielectric layer22that is formed on the surface of carrying board20and on active surface210of first optoelectronic component21; a circuit layer23that is formed on the surface of dielectric layer22and electrically connected to first optoelectronic component21; at least a build-up circuit layer structure24that is formed on the surface of dielectric layer22that has circuit layer23, and is electrically connected to circuit layer23; a first opening250that penetrates dielectric layer22and build-up circuit layer structure24, and a second opening252that penetrates build-up circuit layer structure24; as well as at least an optical transmission component26that is embedded in build-up circuit layer structure24. For the purpose of simplifying the explanatory details and figures, the exemplary figure that only shows the formation of one opening200in carrying board20for the disposition of a first optoelectronic component21is provided, but it is not to be used to limit the scope of the present invention.

The carrying board20described above can either be a metal board, a ceramic board, an insulating board, a printed circuit board, an organic substrate, or the randomly stacked structure made of the previous mentioned materials. The organic substrate can either be a printed circuit board or an IC package substrate.

The first optoelectronic component21has an active surface210and a non-active surface211opposite to the active surface, and a plurality of electrode pads210aand optical active areas210bare disposed on the active surface210. The first optoelectronic component21is located in opening200of the carrying board. In this embodiment, the first optoelectronic component21is either an active optical component or a passive optical component, and the active optical component can either be LD (laser diode), LED (light emitting diode), or VCSEL (vertical cavity surface emitting laser), whereas the passive optical component can either be LED or photosensitive components.

The dielectric layer22is formed on the surface of carrying board20and on active surface210of first optoelectronic component21, wherein dielectric layer22has a plurality of holes220to expose electrode pads210aon the active surface of first optoelectronic component21. The dielectric layer22can either be made of organic dielectric materials that can be applied as a thin film or liquid organic resin materials, and these materials can be photosensitive or non-photosensitive organic resins made of either ABF (Ajinomoto Build-up Film), BCB (Benzocyclo-buthene), LCP (Liquid Crystal Polymer), PI (Poly-imide), PPE (Poly(phenylene ether)), PTFE (Poly(tetra-fluoroethylene), FR4, FR5, BT (Bismaleimide Triazine), Aimide or Aramide; or it can be constituted by mixing materials like epoxy resin and glass fiber.

The circuit layer23is formed on the surface of dielectric layer22, and by the conductive via232formed in hole220of dielectric layer22; circuit layer23can electrically connect to electrode pad210aof first optoelectronic component21.

The build-up circuit layer structure24is formed on the surface of dielectric layer22that has a circuit layer23, and is electrically connected to this circuit layer23. The build-up circuit layer structure24is consisted of: a dielectric layer240; a circuit layer242that is stacked upon dielectric layer240; as well as a conductive via-like conductive structure242a, which penetrates dielectric layer240so that circuit layer242is electrically connected to circuit layer23.

A first opening250penetrates both dielectric layer22and built-up circuit layer structure24, while a second opening252penetrates build-up circuit layer structure24; the first opening250is located on top of optical active area210bof the first optoelectronic component21, so that optical active area210bof the first optoelectronic component21is exposed. The first opening250and the second opening252can either be hollow or filled with optical transmitting materials, so that the optical transmitting and receiving components can be protected and thus the transfer of optical signal is facilitated.

The optical transmission component26is embedded in build-up circuit layer structure24, and is constituted of a core layer260and a cladding layer262that encloses around the core layer260. The optical transmission component26has two transmission ends26aand26b, both transmission ends,26aand26b, have at least a reflective surface, and transmission ends26aand26bare facing and exposed through the first opening250and the second opening252respectively. The transmission end26ais opposite to optical active area210bof the first optoelectronic component21.

An additional insulating layer27can be formed on the outer surface of the build-up circuit layer structure24described above, a plurality of holes270can also be formed in insulating layer27to expose the parts of build-up circuit layer structure24that serve as electrical connecting pads244.

In addition to that, the circuit board structure of integrated optoelectronic components above is further comprised of a second optoelectronic component28, which has an active surface280and a non-active surface281opposite to the active surface; the active surface280has a plurality of electrode pads280aand optical active areas280b, and is connected to the electrical connecting pads244of holes270in insulating layer27by conductive component29, which is a solder bump. The optical active area280bon active surface280of the second optoelectronic component28is facing the second opening252, and is opposite to transmission end26bof optical transmission component26. In other words, the first optoelectronic component21and the second optoelectronic component28are aligned to the first opening250and the second opening252respectively, so that the signals of the first and the second optoelectronic components21and28can be directly transmitted through optical transmission component26. As a result, the signal transfer pathway is shortened, the signal loss is reduced, and the wiring density of the circuit board structure is elevated, thereby improving the electrical functionality of the circuit board structure.

Referring toFIG. 2B, which is another embodiment of the present invention, wherein the bottom surface of carrying board20can be disposed with a supporting board20a. The supporting board20acan either be a metal board, a ceramic board, an insulating board, a printed circuit board, an organic substrate, or the randomly stacked structure made of the previous materials. The organic substrate can either be a printed circuit board or an IC package substrate. As a result, the heat engendered from running the optoelectronic components can be efficiently dissipated, and the electrical functionality of the circuit board structure can be improved.

FIG. 3shows the schematic cross-sectional view of the circuit board structure of integrated optoelectronic components, in accordance with the second embodiment of the present invention.

The circuit board structure of integrated optoelectronic components in this embodiment is approximately the same to the one in the first embodiment, the main differences are that the structure in this embodiment is further comprised of optical transmission components of various types of alignment, and a plurality of first optoelectronic components are disposed in the carrying board; a build-up circuit layer structure is also formed on the circuit board structure that has been embedded with optical transmission components.

Again referring toFIG. 3, the structure it indicates is composed of: the carrying board20, a plurality of first optoelectronic components21and21′, the dielectric layer22, the circuit layer23, the build-up circuit layer structure24, the first and the second openings250and252that penetrate dielectric layer22and build-up circuit layer structure24, and a plurality of optical transmission components36a,36b, and36cthat are embedded in build-up circuit layer structure24.

The above carrying board20has a plurality of through openings200and201, and the first optoelectronic components21and21′ are disposed in openings200and201of carrying board20respectively. The first optoelectronic components can have optoelectronic components with different electrical functionality. Each of the first optoelectronic components21and21′ have an active surface210and210′, and a non-active surface211and211′ opposite to the active surface. The active surfaces210and210′ have a plurality of electrode pads210aand210a′, and optical active areas210band210b′ respectively.

As described previously, the dielectric layer22, the circuit layer23, and the build-up circuit layer structure24are formed on the surface of carrying board20and on active surfaces210and210′ of the first optoelectronic components21and21′, the first and the second openings250and252are also formed in dielectric layer22and build-up circuit layer structure24, so that optical active areas210band210b′ of the first optoelectronic components21and21′ are exposed. A plurality of optical transmission components36a,36b, and36care embedded underneath build-up circuit layer structure24, and transmission ends360aand360bof optical transmission components36aand36bare located in the first opening250, wherein the transmission end360bis opposite to optical active area210bof the first optoelectronic component21. The transmission ends361band361cof optical transmission components36band36care located in the second opening252, and are opposite to optical active area210b′ of the first optoelectronic component21′.

An insulating layer27can be formed on the outer surface of build-up circuit layer structure24, and a plurality of holes270are formed in insulating layer27to expose the parts of circuit layer on the outer surface of build-up circuit layer structure24that serve as electrical connecting pads244; the electrical connecting pads244are electrically connected to the second optoelectronic component28by conductive components, so that the second optoelectronic component28is disposed on top of the first opening250and is opposite to transmission end360aof optical transmission component36a. A circuit board structure that has been integrated with a number of optoelectronic components and a number of optical transmission components is completed at this stage. In other words, a modularized package structure of optoelectronic components is resulted, which in turn elevates the overall electrical functionality of the circuit board structure. An additional supporting board (not shown in the figure) can be formed on the bottom surface of carrying board20, and the supporting board20acan either be a metal board, a ceramic board, an insulating board, a printed circuit board, an organic substrate, or the randomly stacked structure made of the previous materials. The organic substrate can either be a printed circuit board or an IC package substrate. As a result, the heat engendered from running the optoelectronic components can be efficiently dissipated, and the electrical functionality of the circuit board structure can be improved.

Referring toFIG. 4, which illustrates the schematic cross-sectional view of the circuit board structure of integrated optoelectronic components in accordance with the third embodiment of the present invention.

The circuit board structure of integrated optoelectronic components in this embodiment is approximately the same to the one in the first embodiment, the main differences are that the structure in this embodiment is further comprised of optical transmission components of various types of alignment, and a plurality of first optoelectronic components are disposed on the surface of the circuit board.

As shown in the figure, a plurality of through openings200and201of carrying board20are connected to the first optoelectronic components21and21′, wherein the first optoelectronic components can have varied electrical functionality. The dielectric layer22, the circuit layer23, and the build-up circuit layer structure24are successfully formed on the surface of carrying board20and on the active surfaces210and210′ of the first optoelectronic component21, and the first and the second openings250and252are formed in dielectric layer22and build-up circuit layer structure24to expose optical active areas210band210b′ of first optoelectronic components21and21′. A plurality of optical transmission components36a,36b, and36care embedded underneath build-up circuit layer structure24, and the transmission ends360aand360bof optical transmission components36aand36bare located in the first opening250, wherein transmission end360bis opposite to optical active area210bof the first optoelectronic component21; the transmission ends361band361cof optical transmission components36band36care located in the second opening252, wherein transmission end361bof optical transmission component36bis opposite to optical active area210b′ of another first optoelectronic component21′.

An additional insulating layer27can be formed on the outer surface of the build-up circuit layer structure24described above, the insulating layer27also has a plurality of holes270, so that the parts of circuit layer on the outer surface of the build-up circuit layer structure24that serve as electrical connecting pads244are exposed.

In addition, the conductive component29are added on top of electrical connecting pads244in order to electrically connect electrical connecting pads244to the second optoelectronic components28and28′, so that the second optoelectronic components28and28′ are disposed upon the first and the second openings250and252respectively, thereby making transmission ends360aand361cof optical transmission components36aand36calign to the second optoelectronic components28and28′ respectively. As a result, many different optoelectronic components and optical transmission components can be integrated into a circuit board structure, which also gives rise to a modularized package structure of optoelectronic components that can elevate the overall electrical functionality of the circuit board structure. In the circuit board structure described above, the second optoelectronic components can have varied electrical functionality, and an additional supporting board (not shown in the figure) can be connected to the bottom surface of carrying board20, the supporting board20acan either be a metal board, a ceramic board, an insulating board, a printed circuit board, an organic substrate, or the structure made by stacking a combination of the previous materials together. The organic substrate can either be a printed circuit board or an IC package substrate. As a result, the heat engendered from running the optoelectronic components can be efficiently dissipated, and the electrical functionality of the circuit board structure can be improved.

Therefore, in the circuit board structure of integrated optoelectronic components of the present invention, at least a first optoelectronic component is embedded in the opening of the carrying board, then a dielectric layer, a circuit layer, and build-up circuit layer structures are successively formed on the carrying board the active surface of the optoelectronic component, a plurality of first and second openings are formed and they penetrate the dielectric layer and the build-up circuit layer structures. At least an optical transmission component is also formed in the build-up circuit layer structures, and one of the transmission ends of the optical transmission component is located in the first opening and is opposite to the optical active area on the active surface of the first optoelectronic component, thereby forming a circuit board structure of integrated optoelectronic components embedded with at least one optoelectronic component and one optical transmission component. The present invention provides that the circuit layer is electrically connected to the electrode pads of the optoelectronic component directly; as a result, the alignment between the circuit and the electrode pads of the optoelectronic component is improved.

In addition, according to the present invention, the optical transmission components are embedded underneath the build-up circuit layer structure. In other words, it is not necessary to separately form the groove for fitting the optical transmission component, and the optical transmission component can be directly embedded underneath the dielectric layer of the build-up circuit layer structure during the process of making the build-up circuit layer structure. Hence the production process can be simplified and the production costs can be reduced.

Moreover, in the circuit board structure of integrated optoelectronic components of the present invention, the optoelectronic component and the optical transmission component are embedded inside it, and thus the package size of the product can be reduced to meet the demand of miniaturization for electronic devices. By integrating the optoelectronic components, problems like signal loss during signal transfer, overlong conductivity pathway, and the occurrence of noises can be mitigated significantly, thereby improving the quality of signal transfer.

Furthermore, at least an additional second optoelectronic component can be formed on the outer surface of the build-up circuit layer structure in the present invention, so that the first optoelectronic component embedded in the carrying board can transmit its signal through the optical transmission component formed under the build-up circuit layer structure. As a result, a modularized circuit board structure is formed, which can satisfy the constantly rising demands regarding the quality of electronic products.

Besides, in accordance with the present invention, the bottom surface of the carrying board can be further disposed with a heat dissipation board, so that the heat produced from running the first optoelectronic components embedded in the carrying board can be effectively dispelled by the heat dissipation board. As a result, the reliability of the optoelectronic components is ensured and their durability can be extended.