TWI385435B - Lcos device and assembly of lcos device and circuit board - Google Patents

Description

Single crystal germanium liquid crystal element and assembly structure thereof with circuit board

The present invention relates to a display element, and more particularly to a liquid crystal on silicon device (LCOS device) and an assembly structure thereof with a wiring board.

1 is a schematic view showing the assembly structure of a conventional single crystal germanium liquid crystal element and a flexible printed circuit board (FPCB). Referring to FIG. 1 , a conventional single crystal germanium liquid crystal cell 100 includes a germanium substrate 110 and a color filter substrate 120 . The substrate 110 has a first surface 112 and a second surface 114. The first surface 112 is provided with a circuit layer 116, and the circuit layer 116 has at least one bonding pad 116a. The color filter substrate 120 is opposite to the first surface 112 and partially covers the first surface 112 and the wiring layer 116 of the ruthenium substrate 110 to expose the pad 116a.

In the prior art, the method of assembling the single crystal germanium liquid crystal element 100 and a flexible printed circuit board 60 is to first place a thermal conductive paste 50 on the flexible printed circuit board 60, and then to connect the single crystal germanium liquid crystal element. The 100 is placed on the thermal conductive paste 50, and then the thermal conductive paste 50 is cured to fix the single crystal germanium liquid crystal cell 100 to the flexible printed circuit board 60. Next, a wire bonding process is performed to connect a bonding wire 70 between the pad 116a of the single crystal germanium liquid crystal cell 100 and a pad 62 of the flexible printed circuit board 60. Thus, the single crystal germanium liquid crystal element 100 can be electrically connected to the flexible printed circuit board 60 through the bonding wires 70.

2 is a schematic view of a single crystal germanium liquid crystal cell fabricated on a wafer, and FIG. 3 is a schematic view of a portion of the single crystal germanium liquid crystal cell of FIG. Referring to FIG. 2 and FIG. 3, the single crystal germanium liquid crystal device 100 is fabricated by simultaneously forming a plurality of single crystal germanium liquid crystal cells 100 on a wafer 200, and then performing a separation process. These single crystal germanium liquid crystal cells 100 are separated.

However, in each of the single crystal germanium liquid crystal cells 100, since the color filter substrate 120 partially covers the first surface 112 and the wiring layer 116 of the germanium substrate 110, and part of the color filter substrate 120 protrudes beyond the germanium substrate 110, When the separation process is performed, the color filter substrate 120 and the germanium substrate 110 are respectively subjected to a dicing and dicing process, and the dicing substrate line 110 of the wafer 200 is required to have a cutting indication line 210.

Based on the above, the conventional method for fabricating the single crystal germanium liquid crystal element 100 requires two cutting and splitting processes, which is time consuming. In addition, when the splitting process is performed, the cracking is likely to occur.

The present invention provides a single crystal germanium liquid crystal cell which has an advantage of being easy to manufacture.

The present invention further provides an assembly structure of a single crystal germanium liquid crystal element and a wiring board, which has an advantage of being easy to assemble.

In order to achieve the above advantages, the present invention provides a single crystal germanium liquid crystal cell comprising a silicon substrate and an opposite substrate. The 矽 substrate has a first surface and a second surface, wherein the first surface is provided with a circuit layer, and the 矽 substrate further has a plurality of conductive through holes extending from the first surface through the substrate to the second surface. The opposite substrate is opposite the first surface, and the opposite substrate completely covers the first surface.

In an embodiment of the invention, the third surface of one of the opposite substrates is the same size as the first surface of the germanium substrate, and the third surface faces the first surface.

In an embodiment of the invention, the opposite substrate is a glass substrate or a color filter substrate.

In an embodiment of the invention, the single crystal germanium liquid crystal device further includes a liquid crystal layer disposed between the germanium substrate and the opposite substrate.

The invention further provides an assembly structure of a single crystal germanium liquid crystal element and a circuit board, which comprises a circuit board, a conductive paste and the above single crystal germanium liquid crystal element. The conductive paste is disposed between the circuit board and the single crystal germanium liquid crystal element, and the second surface of the single crystal germanium liquid crystal element is connected to the conductive paste.

In an embodiment of the invention, the circuit board is a flexible printed circuit board.

In the single crystal germanium liquid crystal device of the present invention, since the opposite substrate completely covers the germanium substrate and does not protrude beyond the germanium substrate, when a plurality of single crystal germanium liquid crystal devices on the wafer are separated, only one crystal is required to be performed. Round cutting process. Therefore, the single crystal germanium liquid crystal cell of the present invention has an advantage of being easy to manufacture as compared with the prior art. Further, in the assembled structure of the single crystal germanium liquid crystal element and the wiring board of the present invention, since the wiring layer of the single crystal germanium liquid crystal element is electrically connected to the wiring board through the via hole and the conductive paste, the wire bonding process is not required. Therefore, the assembled structure of the single crystal germanium liquid crystal element and the wiring board of the present invention has an advantage of being easy to assemble as compared with the prior art.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

4 is a schematic view of a single crystal germanium liquid crystal cell according to an embodiment of the present invention. Referring to FIG. 4, the single crystal germanium liquid crystal element 300 of the present embodiment includes a germanium substrate 310 and a pair of substrates 320. The substrate 310 has a first surface 312 and a second surface 314 opposite to each other, wherein the first surface 312 is provided with a wiring layer 316. The germanium substrate 310 further has a plurality of vias 318 that extend from the first surface 312 through the germanium substrate 310 to the second surface 314. Counter substrate 320 is disposed on the first surface 312, and the opposite substrate 320 completely covers the first surface 312.

In the above, the opposite substrate 320 can be a glass substrate or a color filter substrate. Moreover, the size of one of the third surfaces 322 of the counter substrate 320 is the same as the size of the first surface 312 of the germanium substrate 310, and the third surface 322 is facing the first surface 312. In other words, the opposite substrate 320 completely covers the first surface 312 and the wiring layer 316 and does not protrude beyond the ruthenium substrate 310. In addition, the single crystal germanium liquid crystal element 300 may further include a liquid crystal layer 330 disposed between the germanium substrate 310 and the opposite substrate 320.

In the single crystal germanium liquid crystal element 300 of the present embodiment, the germanium substrate 310 has via holes 318, and the wiring layer 316 can be electrically connected to other elements through the via holes 318. Compared with the prior art, since the single crystal germanium liquid crystal element 300 of the present embodiment does not need to be provided with a solder pad on the first surface 312 of the germanium substrate 310, the opposite substrate 320 does not need to protrude beyond the germanium substrate 310 to expose Solder pad. Therefore, in the embodiment, the opposite substrate 320 can completely cover the first surface 312 and the wiring layer 316 without protruding beyond the germanium substrate 310. Thus, when a plurality of single crystal germanium liquid crystal cells 300 on a wafer are separated, only one cutting process is required, and no cutting lines are required on the wafer. The single crystal germanium liquid crystal cell 300 of the present embodiment has an advantage of being easy to manufacture, as compared with the prior art, which requires two cutting and splitting processes. Further, since the splicing process is not required, the occurrence of cracking failure can be avoided, and the production yield of the single crystal germanium liquid crystal element 300 can be improved.

Fig. 5 is a view showing the assembled structure of a single crystal germanium liquid crystal element and a wiring board according to an embodiment of the present invention. Referring to FIG. 5, the assembled structure 400 of the single crystal germanium liquid crystal device and the circuit board of the present embodiment includes a circuit board 410, a conductive paste 420, and the above-described single crystal germanium liquid crystal element 300. The conductive paste 420 is disposed between the circuit board 410 and the single crystal germanium liquid crystal element 300, and the second table of the single crystal germanium liquid crystal element 300 The face 314 is connected to the conductive paste 420. In addition, the circuit board 410 can be a flexible printed circuit board, but is not limited thereto.

In the present embodiment, the method of assembling the single crystal germanium liquid crystal element 300 and the wiring board 410 is to fix the single crystal germanium liquid crystal element 300 to the wiring board 410 by the conductive paste 420. The circuit layer 316 of the substrate 310 can be electrically connected to the circuit board 410 through the via 318 and the conductive paste 420. Compared with the prior art, since the wire bonding process is not required in the embodiment, the assembly efficiency of the assembled structure 400 of the single crystal germanium liquid crystal element and the circuit board can be improved.

In summary, the present invention has at least the following advantages: 1. In the single crystal germanium liquid crystal device of the present invention, since the opposite substrate completely covers the germanium substrate and does not protrude beyond the germanium substrate, When a plurality of single crystal germanium liquid crystal elements are separated, only one wafer cutting process is required. Therefore, the single crystal germanium liquid crystal cell of the present invention has an advantage of being easy to manufacture as compared with the prior art.

2. In the assembled structure of the single crystal germanium liquid crystal element and the circuit board of the present invention, since the wiring layer of the single crystal germanium liquid crystal element is electrically connected to the wiring board through the via hole and the conductive paste, the wire bonding process is not required. The assembly structure of the single crystal germanium liquid crystal element of the present invention and the wiring board can be easily assembled.

While the present invention has been described above in terms of the preferred embodiments, it is not intended to limit the invention, and those of ordinary skill in the art can make a few changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

50‧‧‧thermally conductive colloid

60‧‧‧Flexible printed circuit boards

62, 116a‧‧‧ pads

70‧‧‧welding line

100, 300‧‧‧ single crystal germanium liquid crystal components

110, 310‧‧‧矽 substrate

112, 312‧‧‧ first surface

114, 314‧‧‧ second surface

116, 316‧‧‧ circuit layer

120‧‧‧Color filter substrate

200‧‧‧ wafer

210‧‧‧ cutting indicator line

318‧‧‧through holes

320‧‧‧ opposite substrate

322‧‧‧ third surface

330‧‧‧Liquid layer

400‧‧‧Assembly structure of single crystal germanium liquid crystal element and circuit board

410‧‧‧ circuit board

420‧‧‧Electrical colloid

1 is a schematic view showing the assembly structure of a conventional single crystal germanium liquid crystal element and a flexible wiring board.

2 is a schematic view of a single crystal germanium liquid crystal cell fabricated on a wafer.

Figure 3 is a schematic illustration of a portion of a single crystal germanium liquid crystal cell of Figure 2.

4 is a schematic view of a single crystal germanium liquid crystal cell according to an embodiment of the present invention.

Fig. 5 is a view showing the assembled structure of a single crystal germanium liquid crystal element and a wiring board according to an embodiment of the present invention.

300‧‧‧ Single crystal germanium liquid crystal element

310‧‧‧矽 substrate

312‧‧‧ first surface

314‧‧‧ second surface

316‧‧‧Line layer

318‧‧‧through holes

320‧‧‧ opposite substrate

322‧‧‧ third surface

330‧‧‧Liquid layer

Claims (8)

A single crystal germanium liquid crystal element comprising: a germanium substrate having a first surface and a second surface, wherein the first surface is provided with a circuit layer, and the germanium substrate further has a plurality of via holes, a surface extending through the substrate to the second surface; and a pair of substrates having a third surface opposite the first surface, and the opposite substrate completely covers the first surface, wherein the opposite substrate The third surface has the same size as the first surface of the crucible substrate. The single crystal germanium liquid crystal device according to claim 1, wherein the opposite substrate is a glass substrate or a color filter substrate. The single crystal germanium liquid crystal device according to claim 1, further comprising a liquid crystal layer disposed between the germanium substrate and the opposite substrate. An assembly structure of a single crystal germanium liquid crystal element and a circuit board, comprising: a single crystal germanium liquid crystal element, comprising: a germanium substrate having an opposite first surface and a second surface, wherein the first surface is provided with a circuit layer The 矽 substrate further has a plurality of via holes extending from the first surface to the second surface; the pair of substrates facing the first surface, and the opposite substrate completely covering the first surface a surface; a conductive paste disposed between the circuit board and the single crystal germanium liquid crystal cell, and the second surface of the single crystal germanium liquid crystal cell is connected to the conductive paste. The assembly structure of a single crystal germanium liquid crystal element and a circuit board according to claim 4, wherein a size of a third surface of the opposite substrate is the same as a size of the first surface of the germanium substrate, and the first The three surfaces face the first surface. The single crystal germanium liquid crystal element and the circuit board as described in claim 4 of the patent application scope The assembled structure, wherein the opposite substrate is a glass substrate or a color filter substrate. The assembly structure of the single crystal germanium liquid crystal element and the wiring board according to the fourth aspect of the invention, wherein the single crystal germanium liquid crystal element further comprises a liquid crystal layer disposed between the germanium substrate and the opposite substrate. The assembly structure of the single crystal germanium liquid crystal element and the circuit board according to claim 4, wherein the circuit board is a flexible printed circuit board.