Patent ID: 12259112

DETAILED DESCRIPTION

Please refer toFIG.3, which is a schematic diagram illustrating a layout of an illuminating circuit structure100of a first preferred embodiment according to the invention. As shown byFIG.3, the illuminating circuit structure100for backlight includes a printed baseline layer1and a printed pad layer2successively printed on a film sheet101for electrically connecting with a pair of positive and negative electrodes of an illuminant200. The illuminants mentioned in the following embodiments of the present invention may be, for example, a packaged light-emitting diode (LED) package, or a light-emitting diode bare die that requires a subsequent packaging process. Various embodiments of the present invention have verified that the printing process yield of the film sheets for micro illuminants such as mini-LEDs or micro-LEDs can be improved.

The printed baseline layer1includes a first baseline segment11and a second baseline segment12, which can be obtained with slurry containing micro metallic flakes, such as silver slurry or copper slurry. The first baseline segment11includes a first baseline head111and a first baseline lead112. The embodiments of the present invention define three directions: a baseline direction Do as the extension direction of first baseline segments11,11a-11g,12g,13g,11h,12hand13h; an electrode connection direction De as the direction of connection line passing through the positive and negative electrodes, which may be parallel to the baseline direction Do (e.g. inFIGS.11,14and15) or non-parallel to the baseline direction Do (e.g. inFIGS.3,4,8,9,10,12and13); a bridging direction Db. In the case that the electrode connection direction De is non-parallel to the baseline direction Do, the electrode connection direction De and the baseline direction Do form a tolerance included angle from 60 to 120 degrees; the tolerance included angle may be close to 90 degrees in some embodiments. The bridging direction Db and the baseline direction Do are non-parallel to each other (e.g. inFIGS.11,14and15), so that the bridging direction Db and the baseline direction Do form a tolerance included angle from 60 to 120 degrees; the tolerance included angle may be close to 90 degrees in some embodiments. InFIG.3, the first baseline head111extends in the bridging direction Db. The first baseline lead112extends in the baseline direction Do and is integrally connected to the middle portion of the first baseline lead111to forma T-shaped branch structure as a fault tolerance design. Therein, the first baseline head111has a first length d1 in the bridging direction Db and a fifth length d5 in the baseline direction Do. The first length d1 of the first baseline head111is much greater than the fifth length d5 or the width of the first baseline lead112, e.g. 1.5, 2 or above 2.5 times, in order to achieve a tolerance of printing shifting, and ensure that the branch structure will not extend to the illuminant200, or even to reach in the orthographic projection of the illuminant200. InFIG.3, the electrode connection direction De of (the positive and negative electrodes of) the illuminant200is parallel to the bridging direction Db, or the included angle formed by the electrode connection direction De and the bridging direction Db is less than 30 degrees. In addition, the electrode connection direction De is non-parallel to the baseline direction Do, which forms the above tolerance included angle.

The second baseline segment12and the first baseline segment11extend in parallel in the baseline direction Do. There is a considerable distance between the second baseline segment12and the first baseline segment11in the baseline direction Do and the electrode connection direction De. The second baseline segment12includes a second baseline head121and a second baseline lead122. The second baseline head121extends in the bridging direction Db. The second baseline lead122extends in the baseline direction Do and is integrally connected to the middle portion of the second baseline head121. Because of the tolerance included angle A of the baseline direction Do and the electrode connection direction De, the first baseline head111on the first baseline segment11forms the T-shaped branch structure relative to the first baseline lead112as a fault tolerance design; therein, the second baseline head121has a second length d2 in the bridging direction Db and a seventh length d7 in the baseline direction Do, and the second length D2 is considerably greater than the seventh length d7.

The printed pad layer2includes a first pad (bar shape)21and a second pad (bar shape)22, which can also be realized by plastics containing micron or nanoscale metal particles of gold, silver, copper, nickel, or a combination thereof. The conductivity of the printed pad layer2may be higher than that of the printed baseline layer1. The first pad21includes a rear end211and a front end212. Therein, the rear end211extends in the baseline direction Do and overlaps the middle portion of the first baseline head111. The rear end211has a third length d3 in the electrode connection direction De, less than the first length d1, and a sixth length d6 in the baseline direction Do, greater than the fifth length d5.

The second pad (bar shape)22includes a rear end221and a front end222. The rear end221extends in the baseline direction Do and overlaps the middle portion of the second baseline head121. The rear end221has a fourth length d4 in the electrode connection direction De, less than the second length d2, and an eighth length d8 in the baseline direction Do, greater than the seventh length d7. In the embodiments of the present invention, the front ends212,212b,212c,212e,212g,232g,212h,232hof the first pad21or the front ends222,222b,222c,222e,242g,262gof the second pad22are perpendicular to the electrode connection direction De in principle. InFIG.3, the front end212or the front end222also extends in baseline direction Do. In principle, in the embodiments of the present invention, the front ends212,212b,212c,212e,212g,232g,212h,232hof the first pad21and the front ends222,222b,222c,222e,242g,262gof the second pad22are not provided with a branch structure of circuit printing, so as to improve the print shifting problem of the printed pad layer, which can reduce the circuit density in the orthographic projection of the illuminant200and around the illuminant200and improve the process yield, and also avoid limitations of the circuit layout on the relative position of the illuminant200and the corresponding light-emitting keycap.

As mentioned above, the rear end211of the first pad (bar shape)21is used to be superimposed up and down and then attached to a first electrode (shown by a dotted circle on the left side of the illuminant200in the figure) of the illuminant200, and the rear end221of the second pad (bar shape)22is used to be superimposed up and down and then attached to a second electrode (shown by a dotted circle on the right side of the illuminant200in the figure) of the illuminant200, so as to form electrical connections so that the circuit connected to the first baseline segment11and the second baseline segment12can conduct the illuminant200. The first baseline segment11of the illuminating circuit structure100is a circuit of the printed baseline layer1formed on the film sheet101, for example, by printing. Then, the printed pad layer2is coated on the film sheet101and the printed baseline layer1by screen printing; therein, the printed pad layer2is partially on the printed baseline layer1. The film sheet101can be made of, for example, PE (polyethylene), PC (polycarbonate), PP (polypropylene), PI (polyimide), PVC (polyvinyl chloride), and PET (polyethylene terephthalate) Or other polymer film plastics. Furthermore, solder paste can still be used for electrical connection between the printed pad layer2and the illuminant200. The solder paste can be realized by, for example, a tin-bismuth alloy, a tin-silver-copper alloy, or a combination thereof.

Please continue to refer toFIG.4, which is a schematic diagram illustrating the illuminating circuit structure of the first preferred embodiment according to the invention, in which by extending the first baseline head111and the second baseline head121in the electrode connection direction De to increase the allowable printing range of the printed pad layer2during printing.

As shown byFIG.3andFIG.4, the first baseline head111and the second baseline head121extend in the electrode connection direction De and respectively have the first length d1, greater than the third length d3 of the rear end211of the first pad21, and the second length d2, greater than the fourth length d4 of the rear end221of the second pad22, respectively, so during the printing and coating of the rear end211and the rear end221with the middle portions of the first baseline head111and the second baseline head121as the targets respectively, the ear end211and the rear end221can be formed on the first baseline head111and the second baseline head121within the ranges of the first length d1 and the third length d3 respectively even if deviation from the middle portions of the first baseline head111and the second baseline head121due to process errors occurs. That is, the design that the first baseline head111and the second baseline head121extend along the electrode connection direction De can effectively improve the allowable error range of the printed pad layer2in the printing process, thereby effectively preventing the printed pad layer2from being unable to touch the printed pad layer2due to errors, and relatively improving the process yield of the illuminating circuit structure100.

Furthermore, in the baseline direction Do, the rear end211of the first pad21and the rear end221of the second pad22have the sixth length d6, greater than the fifth length d5 of the first baseline head111, and the eighth length d8 greater than the seventh length d7 of the second baseline head121, respectively, so the rear end211and the rear end221can be effectively used as extensions of the first baseline head111and the second baseline head121, respectively, for the illuminant200to subsequently set.

Please continue to refer toFIG.5, which is a schematic diagram illustrating a layout of a keyboard module with the illuminating circuit structure of the first preferred embodiment according to the invention. As shown byFIG.3andFIG.5, in practice, the illuminating circuit structure100of the present invention can be applied to an electronic device such as a keyboard module300. The keyboard module300includes a circuit membrane301, a keyboard base frame302, a keycap303, and a support assembly304(referring toFIG.6for the latter two). The keycap303is assembled to the keyboard base frame302through the support assembly304. The circuit membrane301can be disposed above or below the keyboard base frame302. The circuit membrane301is provided with membrane switches (not shown) corresponding to each keycap303. The membrane switches are connected to each other to form a key circuit. When the membrane switch on the circuit membrane301is triggered as the keycap303is pressed down, a corresponding key signal can be generated. The illuminating circuit structure100, which plays the role of backlight, and the film sheet101thereof are located below the keyboard base frame302of the keyboard module300.

Furthermore, the circuit membrane301includes a first circuit trace1011and a second circuit trace1012. The first circuit trace1011is turned on through a key pressing. The first baseline lead112and the second baseline lead122of the illuminating circuit structure100are electrically connected to the first circuit trace1011and the second circuit trace1012respectively. Thereby, when the key is pressed, the first circuit trace1011is turned on to send a key signal, so that a current can pass through the illuminant200through the illuminating circuit structure100so as to make the illuminant200emit light. It should be noted that, since the light generated by the illuminant200must pass through a through hole3021of the keyboard base frame302and circuit gaps on the circuit membrane301and be refracted or reflected by the support assembly304, and then can pass through the keycap303, in order to achieve the best key top lighting effect, it is inappropriate to design complex circuit around the illuminant200, so as to not limit the layout of the illuminant200and also to avoid the problems of overflowing, print shifting, and circuit shorting that may occur in the printing process and affect the process yield. Therefore, the first pad (bar shape)21and the second pad (bar shape)22of the printed pad layer2are not suitable for forming a T-shaped or L-shaped bending structure in the overlapping part with the orthographic projection of the illuminant200or around the illuminant200, and enlarging area. In other words, only the first baseline head111and the second baseline head121of the printed baseline layer1, and the rear end211of the first pad21and the rear end221of the second pad22of the printed pad layer2are suitable for branch structures such as T-shaped or L-shaped bending structures of a fault tolerance design. In contrast, adding additional circuit structures to the front end212of the first pad21or the front end222of the second pad22may reduce the yield and limit the location range for the illuminant, and is not suitable for forming branch structures. The front end212and the front end222except for the branch structures are located in the orthographic projection of the illuminant200or around the orthographic projection. Similarly, the first length d1 of the first baseline head111is preferably several times (such as more than 3 times) greater than the fifth length d5 at a multiple ratio, and the second length d2 of the second baseline head121is preferably several times greater than the seventh length d7. The smaller first length d1 and second length d2 can prevent the branch structures from being close to the illuminant200, or even entering the orthographic projection of the illuminant200.

Please continue to refer toFIG.6andFIG.7.FIG.6is a sectional view of another keyboard module with the illuminating circuit structure of the first preferred embodiment according to the invention.FIG.7is an enlarged view of the circle A inFIG.6. First of all, please refer toFIG.6andFIG.7together for the location configuration of the illuminant200. The light generated by the illuminant200enters the keyboard module300through one or more through holes3021of the keyboard base frame302. The projections of these through holes3021on the film sheet101of the illuminating circuit structure100define permeable light entry projections1021and impermeable light entry gap projections1022. The illuminant200of each embodiment of the present invention can be selectively disposed in the light entry projection1021on the film sheet101, so that the light can be directly emitted upwards corresponding to some through hole3021; alternatively, the illuminant300can be disposed in the light entry gap projection1022, so that the light can be transmitted laterally through a light-guiding plate (not shown in the figures) to a portion of the light-guiding plate corresponding to the light entry projection1021and then be emitted upward into the keyboard module300. More specifically, the light emitted by the illuminant200can travel directly upwards at the light entry projection, but cannot travel upwards at the light entry gap projection. From another point of view, the above light entry projections are all located within the projection of the corresponding keycap303on the film sheet101(the range bounded by the outline of the keycap303projected on the film sheet101), and the light entry gap projections cover the area under the peripheral clearance between the adjacent two keycaps303.

As shown byFIG.3,FIG.6andFIG.7, the illuminating circuit structure100of the present invention can also be applied to another keyboard module300in practice. The keyboard module300includes a circuit membrane301, a support assembly304and a keycap303. The circuit membrane301is actually a circuit substrate. The support assembly304is disposed on the circuit membrane301. The keycap303is assembled to the support assembly304. Therein, the illuminating circuit structure100of the present invention is disposed on the circuit membrane301. It can be known fromFIG.6andFIG.7that the first electrode201and the second electrode202of the illuminant200are attached to the rear end211of the first pad21and the rear end221of the second pad22respectively.

Please refer toFIG.8, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a second preferred embodiment according to the invention. An illuminating circuit structure100aincludes a printed baseline layer1aand a printed pad layer2awhich are printed on a film sheet (not shown), for electrically connecting with a pair of positive and negative electrodes of the illuminant200a.

The printed baseline layer1aincludes a first baseline segment11aand a second baseline segment12a. The first baseline segment11aincludes a first baseline head111aand a first baseline lead112a. The first baseline head111aextends in the electrode connection direction De. The first baseline lead112aextends in the baseline direction Do which is nearly perpendicular to the electrode connection direction De, and is integrally connected to an end of the first baseline head111a. Therein, the first baseline head111ahas a first length d1a in the electrode connection direction De and a fifth length d5a in the baseline direction Do. Since the baseline direction Do and the electrode connection direction De form a tolerance included angle A, an L-shaped branch structure is formed by the first baseline head111aon the first baseline segment11arelative to the first baseline lead112a.

The second baseline segment12aincludes a second baseline head121aand a second baseline lead122a. The second baseline head121aextends in the electrode connection direction De. The second baseline lead122aextends in the baseline direction Do and is integrally connected to an end of the second baseline head121a. Therein, the second baseline head121ahas a second length d2a in the electrode connection direction De and a seventh length d7a in the baseline direction Do.

The printed pad layer2aincludes a first pad (bar shape)21aand a second pad (bar shape)22a. The first pad21aincludes a rear end211a. The rear end211aoverlaps the middle portion of the first baseline head111aand has a third length d3a in the electrode connection direction De which is less than the first length d1a. The first pad21aas a whole has a sixth length d6a in the baseline direction Do. The sixth length d6a is greater than the fifth length d5a, and the fifth length d5a is less than the first length d1a, which ensures that the branch structure is not close to the illuminant200a. The second pad22aincludes a rear end221a. The rear end221aoverlaps the second baseline head121aand has a fourth length d4a in the electrode connection direction De which is less than the second length d2a. The second pad22aas a whole has an eighth length d8a in the baseline direction Do which is greater than the seventh length d7a. Since the branch structures inFIG.8are disposed on the first baseline head111aand the second baseline head121aaway from the illuminant200a, the front end212aof the first pad21aand the front end222aof the second pad22aexcept for the branch structures are located in the orthographic projection of the illuminant200aor around the orthographic projection.

As described above, the rear end211aof the first pad21ais used to be connected to a first electrode (not labeled in the figure) of an illuminant200a, and the rear end221aof the second pad22ais used to be connected to a second electrode of the illuminant200a(not labeled in the figure). Thereby, the circuit connecting with the first baseline segment11aand the second baseline segment12acan turn on the illuminant200a.

Please referFIG.9, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a third preferred embodiment according to the invention. An illuminating circuit structure100bincludes a printed baseline layer1band a printed pad layer2bwhich are printed on a film sheet (not shown), for electrically connecting with a pair of positive and negative electrodes201b/202bof the illuminant200b.

The printed baseline layer1bincludes a first baseline segment11band a second baseline segment12b. The first baseline segment11bincludes a first baseline head111b. The first baseline head111bextends in the baseline direction Do. The first baseline head111bhas a first length d1b in the electrode connection direction De which is nearly perpendicular to the baseline direction Do.

The second baseline segment12bincludes a second baseline head121b. The second baseline head121bextends in the baseline direction Do. The second baseline head121bhas a second length d2b in the electrode connection direction De.

The printed pad layer2bincludes a first pad (bar shape)21band a second pad (bar shape)22b. The first pad21bincludes a rear end211band a front end212b. The rear end211bextends in the electrode connection direction De and has a third length d3b in the electrode connection direction De which is greater than the first length d1b. The middle portion of the rear end211boverlaps an end portion of the first baseline head111b. The front end212bextends in the baseline direction Do and is integrally connected to an end portion of the rear end211b.

The second pad (bar shape)22bincludes a rear end221band a front end222b. The rear end221bextends in the electrode connection direction De and has a fourth length d4b in the electrode connection direction De which is greater than the second length d2b. The middle portion of the rear end221boverlaps an end portion of the second baseline head121b. The front end222bextends in the baseline direction Do and is integrally connected to an end portion of the rear end221b. Since the baseline direction Do and the electrode connection direction De form a tolerance included angle A, an L-shaped branch structure is formed by the rear end211bon the first pad21brelative to the front end212b. Furthermore, the rear end211bof the first pad21band the rear end221bof the second pad22bextend rightwards inFIG.9(parallel to the electrode connection direction De); therefore, although the first pad21band the second pad22bhave the same shape, they do not need to be limited to be symmetrically arranged with each other.

Continuing from the above, the front end212bof the first pad21bis used to be connected to a first electrode201bof the illuminant200b, and the front end222bof the second pad22bis used to be connected to a second electrode202bof the illuminant200b, so that the circuit connected to the first baseline segment11band the second baseline segment12bcan turn on the illuminant200b. Furthermore, the illuminating circuit structure100bof this embodiment mainly has the third length d3b greater than the first length d1b in the electrode connection direction De through the rear end211bof the first pad21b, and has the fourth length d4b greater than the second length d2b in the electrode connection direction De through the rear end221bof the second pad22b. For example, the third length d3b is 1.52.5 times greater than the first length d1b, and the fourth length d4b can also be 1.52.5 times greater than the second length d2b, so that when the printed pad layer2bis formed by use of a printing coating process, there is a tolerance of printing in the electrode connection direction De for the printed pad layer2b, effectively preventing the printed pad layer2bfrom being unable to contact the printed baseline layer1bdue to inaccurate printing, and relatively improving the process of the illuminating circuit structure100b. Since the branch structures inFIG.9are disposed on the rear end211bof the first pad21band the rear end221bof the second pad22baway from the illuminant200b, the front end212bof the first pad21band the front end222bof the second pad22bexcept for the branch structures are located in the orthographic projection of the illuminant200bor around the orthographic projection.

Please refer toFIG.10, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a fourth preferred embodiment according to the invention. An illuminating circuit structure100cincludes a printed baseline layer1cand a printed pad layer2cwhich are printed on a film sheet (not shown).

The printed baseline layer1cincludes a first baseline segment11cand a second baseline segment12c. The first baseline segment11cincludes a first baseline head111c. The first baseline head111cextends in the baseline direction Do. The first baseline head111chas a first length d1c in the electrode connection direction De which is nearly perpendicular to the baseline direction Do.

The second baseline segment12cincludes a second baseline head121c. The second baseline head121cextends in the baseline direction Do. The second baseline head121chas a second length d2c in the electrode connection direction De.

The printed pad layer2cincludes a first pad (bar shape)21cand a second pad (bar shape)22c. The first pad21cincludes a rear end211cand a front end212c. The rear end211cextends in the electrode connection direction De and has a third length d3c in the electrode connection direction De which is greater than the first length d1c. The middle portion of the rear end211coverlaps an end portion of the first baseline head111c. The front end212cextends in the baseline direction Do and is integrally connected to an end portion of the rear end211c. Since the baseline direction Do and the electrode connection direction De forma tolerance included angle A, a T-shaped branch structure is formed by the rear end211crelative to the front end212c.

The second pad (bar shape)22cincludes a rear end221cand a front end222c. The rear end221cextends in the electrode connection direction De and has a fourth length d4c in the electrode connection direction De which is greater than the second length d2c. The middle portion of the rear end221coverlaps an end portion of the second baseline head121c. The front end222cextends in the baseline direction Do and is integrally connected to an end portion of the rear end221c.

Continuing from the above, the front end212cof the first pad21cis used to be connected to a first electrode201cof an illuminant200c, and the front end222cof the second pad22cis used to be connected to a second electrode202cof the illuminant200b, so that the circuit connected to the first baseline segment11cand the second baseline segment12ccan turn on the illuminant200c. Since the branch structures inFIG.10are disposed on the rear end211cof the first pad21cand the rear end221cof the second pad22caway from the illuminant200c, the front end212cof the first pad21cand the front end222cof the second pad22cexcept for the branch structures are located in the orthographic projection of the illuminant200cor around the orthographic projection.

Furthermore, the illuminating circuit structure100cof this embodiment mainly has the third length d3c greater than the first length d1c in the electrode connection direction De through the rear end211cof the first pad21c, and has the fourth length d4c greater than the second length d2c in the electrode connection direction De through the rear end221cof the second pad22c, so that when the printed pad layer2cis formed by use of a printing coating process, there is a tolerance of printing in the electrode connection direction De for the printed pad layer2c, effectively preventing the printed pad layer2cfrom being unable to contact the printed baseline layer1bdue to inaccurate printing, and relatively improving the process of the illuminating circuit structure100c.

Please refer toFIG.11, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a fifth preferred embodiment according to the invention. An illuminating circuit structure100dincludes a printed baseline layer1dand a printed pad layer2dwhich are printed on a film sheet (not shown).

The printed baseline layer1dincludes a first baseline segment11dand a second baseline segment12d. The first baseline segment11dincludes a first baseline head111d. The first baseline head111dextends in the electrode connection direction De. The first baseline head111dhas a first length did in the bridging direction Db. The bridging direction Db and the electrode connection direction De form a tolerance included angle A and are nearly perpendicular. Therein, the first baseline head111dhas an edge1111d.

The second baseline segment12dincludes a second baseline head121d. The second baseline head121dextends in the electrode connection direction De. The second baseline head121dhas a second length d2d in the bridging direction Db. Therein, the second baseline head121dhas an edge1211d.

The printed pad layer2dincludes a first pad (bar shape)21dand a second pad (bar shape)22d. The first pad21dincludes a rear end211dand a front end212d. The first pad21das a whole extends straightly in the bridging direction Db. The first pad21dhas a third length d3d in the bridging direction Db, which is greater than the first length d1d. The rear end211dof the first pad21dis spaced apart from the edge1111dand overlaps the first baseline head111d. That is, the first baseline head111dand the rear end211dof the first pad21dform a cross-shaped branch structure that has the tolerance included angle A.

The second pad (bar shape)22dincludes a rear end221dand a front end222d. The second pad22das a whole extends in the bridging direction Db. The second pad22dhas a fourth length d4d in the bridging direction Db, which is greater than the second length d2d. The rear end221dis spaced apart from the edge1211dand overlaps the second baseline head121d. That is, the second baseline head121dand the rear end221dof the second pad22dform a cross-shaped branch structure that also has the tolerance included angle A.

Continuing from the above, the front end212dof the first pad21dis used to be connected to a first electrode201dof an illuminant200d, and the front end222dof the second pad22dis used to be connected to a second electrode202dof the illuminant200b, so that the circuit connected to the first baseline segment11dand the second baseline segment12dcan turn on the illuminant200d. In this embodiment, the illuminant200d, the front end212dof the first pad21d, and the front end222dof the second pad22dare located between the first baseline segment11dand the second baseline segment12dwhich are substantially parallel. Therefore, a larger distance is required between the first baseline segment11dand the second baseline segment12dthan in other embodiments. The first pad21dand the second pad22dwill also have a longer overall length. The rear end211dof the first pad21dand the rear end221dof the second pad22dmust be long enough to cross the first baseline segment11dand the second baseline segment12d, respectively. For example, the sum of the lengths of the first pad21dand the second pad22din the bridging direction Db is greater than the distance between the first baseline segment11dand the second baseline segment12d. If necessary, in order to overcome the error in printing the baseline direction Do, the projections of the first baseline head111dand the second baseline head121dof the first baseline segment11dand the second baseline segment12din their normal direction (i.e. the bridging direction Db) may overlap each other. However, this configuration will also make the overall occupied area larger, and relatively limit the flexibility of arranging the position of the illuminant200d. Therefore, more consideration must be given when adopting this configuration.

Furthermore, the cross-shaped branch structures are not located in an orthographic projection of the illuminant200dor around the orthographic projection. The front end212dof the first pad21dand the front end222dof the second pad22dexcept for the branch structures are located in the orthographic projection of the illuminant200dor around the orthographic projection, in order to improve the printing yield.

The illuminating circuit structure100dof this embodiment mainly has the third length d3d greater than the first length did in the bridging direction Db through the rear end211dof the first pad21d, and has the fourth length d4d greater than the second length d2d in the bridging direction Db through the rear end221dof the second pad22d, so that when the printed pad layer2dis formed by use of a printing coating process, there is a tolerance of printing in the bridging direction Db for the printed pad layer2d, effectively preventing the printed pad layer2dfrom being unable to contact the printed baseline layer1ddue to inaccurate printing, and relatively improving the process of the illuminating circuit structure100d.

Please refer toFIG.12, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a sixth preferred embodiment according to the invention. An illuminating circuit structure100eincludes a printed baseline layer1dand a printed pad layer2ewhich are printed on a film sheet (not shown).

The printed baseline layer1eincludes a first baseline segment11eand a second baseline segment12e. The first baseline segment11eincludes a first baseline head111e. The first baseline head111eextends in the baseline direction Do. The first baseline head111ehas a first length d1e in the electrode connection direction De. Therein, the first baseline head111ehas an edge1111e.

The second baseline segment12eincludes a second baseline head121e. The second baseline head121eextends in the baseline direction Do. The second baseline head121ehas a second length d2e in the electrode connection direction De. Therein, the second baseline head121ehas an edge1211e.

The printed pad layer2eincludes a first pad (bar shape)21eand a second pad (bar shape)22e. The first pad21eincludes a rear end211eand a front end212e. The rear end211eextends straightly in the electrode connection direction De, and has a third length d3e in the electrode connection direction De, which is greater than the first length d1e. The rear end211eis spaced apart from the edge1111eand overlaps the middle portion of the first baseline head111. The front end212eextends in the baseline direction Do and is integrally connected to the rear end211e. Since the baseline direction Do and the electrode connection direction De form a tolerance included angle A, an L-shaped branch structure is formed by the rear end211eon the first pad21erelative to the front end212e.

The second pad (bar shape)22eincludes a rear end221eand a front end222e. The rear end221eextends in the electrode connection direction De, and has a fourth length d4e in the electrode connection direction De, which is greater than the second length d2e. The rear end221eis spaced apart from the edge1211eand overlaps the second baseline head121e. The front end222eextends in the baseline direction Do and is integrally connected to the rear end221e. Furthermore, since the first baseline head111eand the rear end211eof the first pad21eform a cross-shaped branch structure, a tolerance of printing shifting is allowed in both the electrode connection direction De and the baseline direction Do. The second baseline head121eand rear end222eof the second pad22emay also have similar designs.

Continuing from the above, the front end212eof the first pad21eis used to be connected to a first electrode201eof an illuminant200e, and the front end222eof the second pad22eis used to be connected to a second electrode202eof the illuminant200e, so that the circuit connected to the first baseline segment11eand the second baseline segment12ecan turn on the illuminant200e. In this embodiment, the illuminant200e, the front end212eof the first pad21e, and the front end222eof the second pad22eare located between the first baseline segment11eand the second baseline segment12ewhich are substantially parallel. Therefore, a larger distance is required between the first baseline segment11eand the second baseline segment12ethan in other embodiments, and is slightly smaller than the distance between the first baseline segment11dand the second baseline segment12dinFIG.11. The rear end211eof the first pad21eand the rear end221eof the second pad22emust be long enough to cross the first baseline segment11eand the second baseline segment12e, respectively. For example, the sum of the lengths of the illuminant200e, the first pad21e, and the second pad22ein the electrode connection direction De is greater than the distance between the first baseline segment11eand the second baseline segment12e. If necessary, in order to overcome the error in printing the baseline direction Do, the projections of the first baseline head111eand the second baseline head121eof the first baseline segment11eand the second baseline segment12ein their normal direction (i.e. the electrode connection direction De) may overlap each other. However, similarly toFIG.11, this configuration will also make the overall occupied area larger, and relatively limit the flexibility of arranging the position of the illuminant200e. Therefore, more consideration must be given when adopting this configuration. Since the branch structures inFIG.12are located at the rear end211eof the first pad21eand the rear end221eof the second pad22eaway from the illuminant200e. The front end212eof the first pad21eand the front end222eof the second pad22eexcept for the branch structures are located in the orthographic projection of the illuminant200eor around the orthographic projection.

On the whole, in the electrode connection direction De, the sum of the widths of the third length d3e of the rear end211eof the first pad21eand the illuminant200eis greater than the distance between the inner sides of the first baseline segment11eand second baseline segment12e(even greater than the distance between the outer sides thereof), which can provide a fault tolerance in the electrode connection direction De during printing. Furthermore, the illuminating circuit structure100eof this embodiment is similar to the above illuminating circuit structure100e. Both of them provide fault tolerances in both the electrode connection direction De and the baseline direction Do during the process of using a printing coating process to form the printed pad layer2e, mainly through the third length d3e, which is greater than the first length d1e, and the fourth length d4e, which is greater than the second length d2e. This can effectively prevent the printed pad layer2efrom being unable to contact the printed baseline layer1edue to errors, and relatively improve the process yield of the illuminating circuit structure100e.

Please refer toFIG.13, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a seventh preferred embodiment according to the invention. An illuminating circuit structure100fincludes a printed baseline layer if and a printed pad layer2fwhich are printed on a film sheet (not shown), for electrically connecting with a pair of electrodes of an illuminant200f.

The printed baseline layer if includes a first baseline segment11fand a second baseline segment12f. The first baseline segment11fincludes a first baseline head111f. The first baseline head111fextends in the baseline direction Do. The first baseline head111fhas a first length d1f in the electrode connection direction De which is nearly perpendicular to the baseline direction Do.

The second baseline segment12fincludes a second baseline head121f. The second baseline head121fextends in the baseline direction Do. The second baseline head121fhas a second length d2f in the electrode connection direction De.

The printed pad layer2fincludes a first pad (round shape)21fand a second pad (round shape)22f. The first pad21fincludes a rear end211f. The rear end211fhas a third length d3f in the bridging direction Db, which is greater than the first length d1f. The rear end211fis connected to the first baseline head111f.

The second pad (round shape)22fincludes a rear end221f. The rear end221fhas a fourth length d4f in the bridging direction Db, which is greater than the second length d2f. The rear end221fis connected to the second baseline head121f.

Continuing from the above, the rear end211fof the first pad21dis used to be connected to a first electrode201fof an illuminant200f, and the rear end221fof the second pad22fis used to be connected to a second electrode202fof the illuminant200b, so that the circuit connected to the first baseline segment11fand the second baseline segment12fcan turn on the illuminant200f.

Therein, the illuminating circuit structure100fof this embodiment provides a fault tolerances in the bridging direction Db during the process of using a printing coating process to form the printed pad layer2f, mainly through the third length d3f, which is greater than the first length d1f, and the fourth length d4f, which is greater than the second length d2f. This can effectively prevent the printed pad layer2ffrom being unable to contact the printed baseline layer if due to errors, and relatively improve the process yield of the illuminating circuit structure100f.

Please refer toFIG.14, which is a schematic diagram illustrating a layout of an illuminating circuit structure of an eighth preferred embodiment according to the invention. An illuminating circuit structure100gincludes a printed baseline layer1gand a printed pad layer2gwhich are printed on a film sheet (not shown), for electrically connecting with a pair of electrodes of each of three illuminants200R,200G and200B (e.g. including three light-emitting diodes; red, green, and blue, three in total). InFIG.14, the three illuminants200R,200G and200B are arranged in a straight line and have the same electrode connection direction De that is parallel to the baseline direction Do. In this embodiment, both the electrode connection direction De and the baseline direction Do form a tolerance included angle A with the bridging direction Db.

The printed baseline layer1gincludes three first baseline segments11g,12gand13gand three second baseline segments14g,15gand16g. The first baseline segments11g,12gand13grespectively include a first baseline head111g,121gand131gand a first baseline lead112g,122gand132g. The three first baseline heads111g,121gand131gextend in the bridging direction Db. The three first baseline leads112g,122gand132gin the baseline direction Do/the electrode connection direction De that is nearly perpendicular to the bridging direction Db, and are integrally connected to the middles of the first baseline heads111g,121gand131g. Each of the first baseline heads111g,121gand131ghas a first length d1 in the bridging direction Db and a fifth length d5 in the baseline direction Do/the electrode connection direction De, which is less than the fifth length d5.

The second baseline segments14g,15gand16grespectively include a second baseline head141g,151gand161gand a second baseline lead142g,152gand162g. The second baseline heads141g,151gand161gextend in the bridging direction Db. The second baseline leads142g,152gand162gextends in the baseline direction Do/the electrode connection direction De. Each of the second baseline leads142g,152gand162ghas a second length d2 in the bridging direction Db and a seventh length d7 in the baseline direction Do/the electrode connection direction De, which is less than the second length d2.

The printed pad layer2gincludes three first pads21g,22gand23gand three second pads24g,25gand26g. The first pads21g,22gand23grespectively include a rear end211g,221gand231gand a front end212g,222gand232g. The rear ends211gand231gextend in the baseline direction Do/the electrode connection direction De, and overlap ends of the first baseline heads111gand131g, respectively. The rear ends211gand231grespectively have a third length d3 in the bridging direction Db, which is less than the first length d1. The front ends212gand232gextend in the bridging direction Db, and are integrally connected to ends of the rear ends211gand231g, respectively. The front ends212g,222gand232gare connected to the first electrodes201g,202gand203gof the illuminant200B,200R and200G, respectively.

The front end232gand the front end252gextend in the baseline direction Do/the electrode connection direction De, and are integrally connected to ends of the rear end231gof the first pad23gand the rear end251gof the second pad25g. In contrast, the first pads21gand23gare similar structures with mirror symmetry, and the difference is only that the front ends212gand232gof the first pads21gand23gare connected to opposite sides of the rear ends211gand231gof the first pads21gand23g, respectively. The same is true for the second pads24gand26g.

The second pads24g,25gand26grespectively include a rear end241g,251gand261gand a front end242g,252gand262g. The front ends242gand262gextends in the bridging direction Db and are connected to second electrodes204g,205gand206gof the illuminants200B,200R and200G. The rear ends241g,251gand261gextend in the baseline direction Do/the electrode connection direction De, and are connected to the second baseline heads141g,151gand161g. The rear ends241g,251gand261grespectively has a fourth length d4 in the bridging direction Db, which is less than the second length d2.

Continuing from the above, in the embodiment, the first baseline segments11g,12gand13gand the second baseline segments14g,15gand16ghave the first baseline heads111g,121gand131gand the second baseline heads141g,151gand161gas branch structures, respectively. Even if print shifting of the first pads21g,22gand23gand the second pads24g,25gand26goccurs in the bridging direction De, the first baseline heads111g,121gand131gand the second baseline heads141g,151gand161gcan still overlap the front ends212g,222gand232gand the rear ends241g,251gand261g. The rear ends241gand261gcan also be regarded as the branch structures of the second pads24gand26g. To sum up, branch structures are formed where the baseline heads of the printed baseline layer1gand the rear ends of the pads of the printed pad layer2gare connected. These branch structures have the tolerance included angle A, which is conducive to reduction of the circuit density in the orthographic projection of the illuminant or around the illuminant in addition to making connections in the presence of print shifting. Besides, the first/second pad of the invention does not have branch structures such as T-shaped or L-shaped bends within the orthographic projection of the illuminant or around the illuminant and does not expand the occupied area, which avoids designs of limiting the disposition of the illuminant and also avoids the problems of overflowing, print shifting, and circuit shorting that may occur, which improves the printing process yield of micro illuminants such as mini-LEDs or micro-LEDs.

Furthermore, the first lengths d1 of the first baseline heads111g,121gand131gin the bridging direction Db are greater than the fifth lengths d5 of the first baseline heads111g,121gand131gin the baseline direction Do/the electrode connection direction De, respectively; the first lengths d1 greater than the third lengths d3 of the rear ends211g,221gand231gin the bridging direction Db, respectively. Besides, the second lengths d2 of the second lengths d2 of the second baseline heads141g,151gand161gin the bridging direction Db are greater than the seventh lengths d7 of the second baseline heads141g,151gand161gin the baseline direction Do/the electrode connection direction De, respectively; the second lengths d2 are greater than the fourth lengths d4 of the rear ends241g,251gand261gin the bridging direction Db, respectively. Therefore, it can ensure that the branch structures of the printed baseline layer1gand the printed pad layer2gare away from the illuminants200B,200R and200G, so as to effectively solve the print shifting problem of the printed pad layer2g, without increasing the circuit density in the orthographic projections of the illuminants200B,200R and200G and around the illuminants200B,200R and200G, and to relatively improve the process yield of the illuminating circuit structure100.

Please refer toFIG.15, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a ninth preferred embodiment according to the invention. An illuminating circuit structure100hincludes a printed baseline layer1hand a printed pad layer2h. In this embodiment, the electrode connection direction De is parallel to the baseline direction Do. Both the electrode connection direction De and the baseline direction Do form a tolerance included angle A with the bridging direction Db.

The printed baseline layer1hincludes three first baseline segments11h,12hand13hand three second baseline segments14h,15hand16h. The first baseline segments11h,12hand13hrespectively include a first baseline head111h,121hand131hand a first baseline lead112h,122hand132h. The first baseline segments11h,12hand13his structurally similar to the first baseline segments11g,12gand13gof the above embodiment, and will not be described herein.

The second baseline segments14h,15hand16hinclude the second baseline heads141h,151hand161hextending in the bridging direction Db, respectively. The second baseline heads141h,151hand161hinclude a span of layout area dah in the bridging direction Db; in more detail, the span of layout area dah refers to the total width of the outermost two of the second baseline headers141h,151hand161h, that is, from the edge of the second baseline head141haway from the second baseline head151hto the edge of the second baseline head161haway from the second baseline head151h. In other words, the total width is equivalent to the sum of the widths of the second baseline heads141h,151hand161hin the bridging direction Db and the gaps between the three.

The printed pad layer2hincludes three first pads21h,22hand23hand a second pad24h, connected to the first electrodes201h,202hand203hand second electrodes204h,205hand206hof the illuminants200B,200R and200G, respectively.

The first pads21h,22hand23hrespectively include a rear end211h,221hand231hand a front end212h,222hand232h. The first pads21h,22hand23hare structurally similar to the first pads21g,22gand23g, and will not be described herein.

The second pad24hextends in the bridging direction Db and has a second length d2 greater than the span of layout area dah, so that the second pad24hcan cross the second baseline heads141h,151hand161hand be connected to the second baseline heads141h,151hand161h.

In this embodiment, the front end212hof the first pad21h, the front end222hof the first pad22h, and the front end232hof the first pad23hare used to be connected to the three first electrodes201h,202hand203hof an illuminant200h. The three second electrodes204h,205hand206hof the illuminants200B,200R and200G are connected together to the second pad24h. Therefore, the second pad24hcan achieve the effect of sharing the same cathode or anode for the illuminants200B,200R and200G, which is the main difference betweenFIG.14andFIG.15. Furthermore, the second pad24hcan be regarded as three independent pads that are connected in the bridging direction Db.

Please refer toFIG.16, which is a schematic diagram illustrating a layout of an illuminating circuit structure of a tenth preferred embodiment according to the invention. The embodiments ofFIG.15andFIG.16are similar and both have branch structures that are formed where the first baseline heads111h,121hand131hwith the rear ends211h,221hand231hare connected. However, inFIG.16, the first baseline heads111h,121hand131hdo not extend in the bridging direction Db. On the contrary, the rear ends211h,221hand231hextending in the electrode connection direction De/the baseline direction Do further have rear ends213h,223hand233hextending in the bridging direction Db, and overlap the first baseline heads111h,121hand131hto form three branch structures with a tolerance included angle A. In this way, the above technical problems can also be solved and the same technical effect can be achieved.

As discussed above, the invention utilizes a printed baseline layer and a printed pad layer to form a branch structure where the printed baseline layer and the printed pad layer overlap, so that even if print shifting occurs on the printed pad layer in the manufacturing of the illuminating circuit structure, the rear end of the first/second pad of the printed pad layer still can overlap the first/second baseline head of the printed baseline layer. Furthermore, the branch structure is not located in the orthographic projection of the illuminant or around the orthographic projection, and the circuit density in the orthographic projection of the illuminant and around the illuminant is reduced, thereby improving the process yield of the illuminating circuit structure.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.