1. Field of the Invention
The present invention relates to resistance balance circuits, and more particularly, to a resistance balance circuit aligned in a column matrix or a row matrix and configured for electrical connection between at least two electronic components with a view to achieving homogeneity of current passing the electronic components.
2. Description of the Prior Art
Owing to their advantages over conventional light sources, namely being highly efficient, long-lived and durable, light emitting diodes (LEDs) are widely used in light source facilities, such as traffic signal lamps, vehicle lamps, desk lamps, street lamps, billboards, and liquid crystal display backlight modules.
The LED-based light source facilities require use of plenty LEDs, resulting in a LED array structure 1 shown in
U.S. Pat. No. 5,598,068 was put forth in an attempt to solve the problem facing the LED array structure, that is, low homogeneity of luminance of light source facilities due to tilted resistance balance in the LED array structure. Referring to
Referring to
Accordingly, issues involving LED array-based light source facilities and calling for urgent solution are, namely improvement in LED array luminance homogeneity which has thus far remained unsatisfactory due to circuit resistance unbalance of the LED array, reduction of costs, and process streamlining.
In light of the aforesaid drawbacks of the prior art, it is a primary objective of the present invention to disclose a resistance balance circuit, wherein at least two electronic components aligned in a column matrix or a row matrix are electrically connected to one another, so as to achieve resistance balance of routes for current passing the electronic components in the matrix structure, with a view to achieving homogeneity of current passing the electronic components and allowing the fabrication process to be cheaper and simpler.
In order to achieve the above and other objectives, the present invention discloses a resistance balance circuit, comprising: at least two electronic components aligned in a row matrix, connected to one another in parallel, thereby forming a row matrix structure; an input end disposed at one end of the row matrix structure and configured for entry of current passing the electronic components in the row matrix structure; and an output end disposed diagonally opposite to the output end in the row matrix structure and configured for exit of the current passing the electronic components in the row matrix structure, wherein routes for the current passing the electronic components from the input end to the output end are equal in length.
The resistance balance circuit comprises a plurality of row matrix structures. The output end and input end of the row matrix structures of one level are electrically connected to the input end of the row matrix structures of the lower level and the output end of the row matrix structures of the upper level respectively. The routes for the current passing the electronic components in the row matrix structures of all levels from the input end to the output end of the row matrix structures of all levels are equal in length.
The electronic components of the resistance balance circuit are preferably light emitting diodes.
In another preferred embodiment of the resistance balance circuit of the present invention, the resistance balance circuit comprises: a first level column matrix structure comprising at least two electronic components connected to one another in series; a second level column matrix structure comprising at least two electronic components connected to one another in series, wherein the second level column matrix structure is connected to the first level column matrix structure in parallel, and the first level column matrix structure comprises as many series-connected electronic components as the second level column matrix structure, thereby forming a multi-level column matrix structure; an input end disposed at one end of the multi-level column matrix structure and configured for entry of current passing the electronic components in the multi-level column matrix structure; and an output end disposed diagonally opposite to the output end in the multi-level column matrix structure and configured for exit of the current passing the electronic components in the multi-level column matrix structure, wherein routes for the current passing the electronic components from the input end to the output end are equal in length.
As regards the resistance balance circuit, at least one third level column matrix structure is parallel-connected to between the first level column matrix structure and the second level column matrix structure and provided with at least two series-connected electronic components, and the routes for the current passing the electronic components in the column matrix structures of all levels from the input end to the output end are equal in length.
The electronic components of the resistance balance circuit are preferably light emitting diodes.
A resistance balance circuit of the present invention enhances homogeneity of current passing electronic components, wherein at least two electronic components aligned in a column matrix or a row matrix are electrically connected to one another. The input end for entry of current passing the electronic components in the matrix and the output end for exit of current passing the electronic components in the matrix are disposed at opposite corners of the matrix. The routes for the current passing the electronic components from the input end to the output end are equal in length, such that the same current passes the electronic components in the matrix. The prior art is faced with a problem, that is, lack of homogeneity in luminance of an array of light emitting diodes due to circuit resistance. The resistance balance circuit of the present invention solves the problem by achieving resistance balance of routes for current passing the light emitting diodes
The following specific embodiments are provided to illustrate the present invention. Persons skilled in the art can readily gain insight into other advantages and features of the present invention based on the contents disclosed in this specification.
Referring to
With current entering the input end E1 of the row matrix structure 2 of the resistance balance circuit, the current passes the light emitting diode LED 11 via route S1, route P21, route P22, . . . , route P2N, and route S2, the light emitting diode LED 12 via route S1, route P11, route P22, . . . , route P2N, and route S2, the light emitting diode LED 13 via route S1, route P11, route P12, . . . , route P2N, and route S2, and the other light emitting diodes via routes inferable by analogy. Circuit resistance balance can be achieved by allowing current to pass the light emitting diodes (LED 11, LED 12, . . . , LED 1N) via the same routes, for two reasons: first, the routes (P11, P12, . . . , P1N, P21, P22, . . . , P2N) connecting the light emitting diodes (LED 11, LED 12, LED 1N) in parallel are of equal length; second, current passing the light emitting diodes (LED 11, LED 12, . . . , LED 1N) has to pass the current input route S1 and the current output route S2.
A point to note is that
Referring to
With the row matrix structures (20, 21, 22, . . . , 2M) of a resistance balance circuit being connected to one another in series, the area for aligning the light emitting diodes increases. The light emitting diodes of a single row matrix structure (20, 21, 22, . . . , 2M) are connected to one another in parallel. As regards the row matrix structures (20, 21, 22, . . . , 2M), the routes for current passing the light emitting diodes (LED 11, LED 12, . . . , LED 1N; LED 21, LED 22, . . . , LED 2N; LED 31, LED 32, . . . , LED 3N; and LED M1, LED M2, . . . , LED MN) from the input end E1 to the output end E2 are equal in length, and thus the same current passes each of the light emitting diodes. Since the row matrix structures (20, 21, 22, . . . , 2M) of the resistance balance circuit are connected to one another in series, the same current exits by the output ends E2 connected to the row matrix structures (20, 21, 22, 2M).
The resistance balance circuit can be fabricated by either a semiconductor packaging technique or a combination of the semiconductor packaging technique and a circuit board printing technique. For instance, as taught by a preferred embodiment for the process of fabricating the resistance balance circuit, the row matrix structure comprising the parallel-connected light emitting diodes is a semiconductor package, wherein the input end and output end are pins provided by the semiconductor package. Moreover, as taught by another preferred embodiment for the process of fabricating the resistance balance circuit, the light emitting diodes are each a semiconductor package, wherein the route for connecting the light emitting diodes to one another in parallel, the route for electrically connecting the input end to the row matrix structures, and the route for electrically connecting the output end to the row matrix structures are fabricated by a circuit board printing technique. A fabrication process technique is adopted, depending on the related preferred embodiment.
Referring to
The input end EE1 is disposed at one end of the multi-level column matrix structure 3. Current enters the input end EE1 and passes the light emitting diodes (LED 11, LED 21, LED 31, . . . , LED M1; and LED 12, LED 22, LED 32, . . . , LED M2) in the multi-level column matrix structure 3. The output end EE2 and the input end EE1 are disposed at opposite corners of the multi-level column matrix structure 3 and configured for exit and entry of current passing the light emitting diodes (LED 11, LED 21, LED 31, . . . , LED M1; and LED 12, LED 22, LIED 32, . . . , LED M2) in the multi-level column matrix structure 3. The routes for current passing the light emitting diodes (LED 11, LED 21, LED 31, . . . , LED M1; and LED 12, LED 22, LED 32, . . . , LED M2) from the input end EE1 to the output end EE2 are equal in length.
Refer to
A point to note is that
Referring to
The resistance balance circuit of the fourth preferred embodiment can be fabricated by either a semiconductor packaging technique or a combination of the semiconductor packaging technique and a circuit board printing technique. For instance, as taught by a preferred embodiment for the process of fabricating the resistance balance circuit, the column matrix structures are implemented as a semiconductor package, wherein the input end and output end are pins provided by the semiconductor package. Moreover, as taught by another preferred embodiment for the process of fabricating the resistance balance circuit, the light emitting diodes of the multi-level column matrix structure are each a semiconductor package, wherein the routes for connecting the light emitting diodes to one another in series, connecting the column matrix structures of all levels to one another in parallel, connecting the input end to the multi-level column matrix structure electrically, and connecting the output end to the multi-level column matrix structure electrically are fabricated by a circuit board printing technique. A fabrication process technique is adopted, depending on the related preferred embodiment.
A resistance balance circuit of the present invention enhances homogeneity of current passing electronic components, wherein at least two electronic components aligned in a column matrix or a row matrix are electrically connected to one another. The prior art is faced with a problem, that is, lack of homogeneity in luminance of an array of light emitting diodes that collectively function as a lighting device. The resistance balance circuit of the present invention solves the problem by achieving resistance balance of routes for current passing light emitting diodes despite an increase in the area for aligning the light emitting diodes. Also, the process for fabricating the resistance balance circuit of the present invention is cheaper and simpler than that for fabricating a conventional array of light emitting diodes.
The aforesaid embodiments merely serve as the preferred embodiments of the present invention. The aforesaid embodiments should not be construed as to limit the scope of the present invention in any way. Hence, many other changes can actually be made in the present invention. It will be apparent to those skilled in the art that all equivalent modifications or changes made to the present invention, without departing from the spirit and the technical concepts disclosed by the present invention, should fall within the scope of the appended claims.
Number | Date | Country | Kind |
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096107331 | Mar 2007 | TW | national |