TWI224709B - Liquid crystal display and lamp bonding process thereof - Google Patents

Abstract

A liquid crystal display comprises a liquid crystal display panel having a display region and a non-display region, a lamp, a first flexible printing circuit, and second flexible printing circuit. The lamp is located on the non-display region of the liquid crystal display panel. The first flexible printing circuit is connected to the liquid crystal display panel for linking the liquid crystal display panel to a power system. The second flexible printing circuit is connected to the lamp and located on the first flexible printing circuit, wherein the second flexible printing circuit is connected electrically with the first flexible printing circuit. Therefore, the lamp can get the power supply from the power system through the second flexible printing circuit connected electrically with the first flexible printing circuit.

Description

1224709 V. Description of the invention 0) Technical field of the invention The present invention relates to a welding process for a flat panel display and a lamp source thereof, and more particularly to a welding process for a liquid crystal display device and a lamp source of a liquid crystal display. The prior art liquid crystal display has the advantages of high day quality, small size, light weight, low voltage driving, low power consumption and wide application range. Therefore, it has been widely used in small and medium-sized portable TVs, mobile phones, cameras, etc. Consumer electronics or computer products such as video recorders, notebook computers, desktop monitors, and projection televisions have gradually replaced cathode ray tubes (CRT) and become mainstream displays. In a liquid crystal display device, a lamp source of the liquid crystal display is necessary. However, the electric power system of the lamp source of the conventional liquid crystal display products is separate from the functional system of the liquid crystal display panel. As shown in FIG. 1, the conventional liquid crystal display device includes a liquid crystal display panel 10, a light source 110, a power line 14, and a flexible circuit board 12. The liquid crystal display panel 10 has a display area 11 and a non-display area 13. The liquid crystal display panel 10 is connected to a functional system 16 through a flexible circuit board 12 for driving and controlling the display of the liquid crystal display panel 10. The light source 101 is arranged in the non-display area 1 3 of the liquid crystal display panel 10. And the light source 1 0 1 series 4 is connected to an electric power system 18 through a power line 14 to supply power to the light source 1 0 1. Therefore, the design of the conventional liquid crystal display device must be illuminated and function activated by a complicated circuit system. And complicated electricity

9884twf.ptd Page 6 1224709 V. Description of the invention (2) The road system will not only cause troubles in the inspection, but also the exposed power cords are prone to problems such as broken wires, incorrect colors, or disconnected wires during quality control inspection. In addition, the traditional soldering process is to mechanically solder the component to be soldered to the printed circuit board (PCB). Since the printed circuit board is a hard board object, the pressure welding method can be directly used to improve the accuracy of the welding pressure point and the uniformity of the welding. The welding method of the above-mentioned liquid crystal display lamp source and external circuit is to use the traditional printed circuit board welding process, which is described in detail below. Figures 2A and 2B show the top and side views of a conventional welding process for a lamp source of a liquid crystal display. Please refer to FIG. 2A and FIG. 2B. First, a printed circuit board 100 is provided, and then the light source element light source 102 is printed on the printed circuit board 100. Next, the power cord 14 is arranged at one end of the printed circuit board 100, and then the solder 104 is directly mechanically soldered to the power cord 14 to fix the power cord 14 to the printed circuit board 10. 0, and the power line 14 and the circuit of the printed circuit board 100 are conducted. Although the soldering and pressing process of printed circuit boards is fast and convenient, it is difficult to meet the trend of miniaturization and thinness of optoelectronic products due to the rigid material of the printed circuit board, its large size, relatively high weight, and difficult deformation. It is not applicable to advanced technology products. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid crystal display device, which can improve the power cord of a conventional liquid crystal display lamp source and drive the liquid crystal display.

9884twf. Ptd Page 7 1224709 V. INTRODUCTION TO THE INVENTION (3) The flexible circuit board of the display is two separate circuits, which leads to the disadvantage of a more complicated circuit system. Another object of the present invention is to provide a welding and pressing process for a lamp source of a liquid crystal display, so as to improve the disadvantages of the conventional welding process using a printed circuit board that cannot be thinned and miniaturized. The invention provides a liquid crystal display device, which includes a liquid crystal display panel, a light source, a first flexible circuit board and a second flexible circuit board. The LCD panel has a display area and a non-display area. The light source is arranged in the non-display area of the liquid crystal display panel as the light source of the backlight module or the front light source module of the liquid crystal display. In the present invention, the light source is composed of, for example, a third flexible circuit board and a plurality of light emitting elements arranged on the third flexible circuit board. In addition, the first flexible circuit board includes a first contact area, and one end of the first flexible circuit board is connected to the liquid crystal display panel, and the other end of the first flexible circuit board is connected to a power system so that The power system can drive and control the display of the LCD panel. In addition, one end of the second flexible circuit board is electrically connected to the light source, in other words, one end of the second flexible circuit board is connected to a third flexible circuit board configured with a plurality of light emitting elements. In addition, the second flexible circuit board is disposed on the first flexible circuit board, and the other end of the second flexible circuit board has a second contact area, which is electrically connected to the first contact area of the first flexible circuit board. Sexual connection. Therefore, the light source of the liquid crystal display device of the present invention is connected to the first flexible circuit board through the second flexible circuit board to obtain power supply from the power system.

9884twf. Ptd Page 8 1224709 V. Description of the invention (4) The present invention proposes a welding and pressing process for a liquid crystal display lamp source, which first provides a first flexible circuit board, wherein the first flexible circuit board has a first contact And one end of the first flexible circuit board is connected to a power system. In the present invention, the other end of the first flexible circuit board is connected to the liquid crystal display panel, so that the power system drives and controls the display of the liquid crystal display panel. After that, a second flexible circuit board is provided, wherein the second flexible circuit board 'has a second contact area, and the second flexible circuit board is electrically connected to a light source. In the present invention, a method of forming a light source is, for example, placing a plurality of light-emitting elements on a third flexible circuit board, and one end of the third flexible circuit board is electrically connected to the second flexible circuit board. Then, the second flexible circuit board is placed on the first flexible circuit board, so that the second contact area on the second flexible circuit board corresponds to the first contact area on the first flexible circuit board, and the first contact area and A conductive layer is formed between the second contact regions. Next, a hot pressing step is performed on the second flexible circuit board to soften the conductive layer, so that the first contact region and the second contact region are conducted. The light emitting element on the second flexible circuit board is passed through the second The flexible circuit board is connected to the first flexible circuit board, and the power supply is obtained from the power system. The liquid crystal display device and the light source welding process of the liquid crystal display device of the present invention combine the power transmission line of the light source and the flexible circuit board connected to the liquid crystal display panel, so that the circuit design can be simplified, and the product Aesthetics. The pressure welding process of the liquid crystal display device and the liquid crystal display lamp source of the present invention can simultaneously detect the display function of the liquid crystal display and the light source.

9884twf.ptd Page 9 1224709 V. Description of the invention (5) Power switch function ‘and then shorten the detection time’ to improve the productivity of the product. The liquid crystal display device and the light source welding process of the liquid crystal display of the present invention, because the power input of the light source uses a flexible circuit board to replace the traditional power cord, so the volume occupied by the product can be reduced, and the client can use it. Space, thereby enhancing the competitiveness of the product. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to make a detailed description as follows: Embodiment _ Figure 3 , Which is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention; FIG. 4 is a diagram of a liquid crystal display light source according to a preferred embodiment of the present invention and used to connect to a power system Top view of the flexible circuit board. Referring to FIG. 3, the liquid crystal display device of this embodiment includes a liquid crystal display panel 10, a light source 3 2 0, a flexible circuit board 3 1 0, and another flexible circuit board 3 2. The liquid crystal display panel 10 has a display area 11 and a non-display area 13. The light source 3 2 0 is arranged in the non-display area 10 of the liquid crystal display panel 10 as a light source of a backlight module or a front light source module (not shown) of the liquid crystal display 10. As shown in FIG. 4, the light source 3 2 0 is composed of a flexible circuit board 3 0 0 and a plurality of light emitting elements 3 0 4 arranged on the flexible circuit board 3 0 0. In this embodiment, the light emitting element 3 0 4 is, for example, an organic light emitting diode.

9884twf. Ptd Page 10 1224709 V. Description of the invention (6) Or inorganic light emitting diode. Qing continued to refer to FIG. 3, the soft circuit y display panel is far away, saying that Chu Cong from one end of the board 310 is connected to the liquid crystal power system, and the other-end of the soft circuit board 310 is connected to-to make the power system The 26 driving control liquid crystal display surface-the flexible electrical 2 board 310 includes a contact area 312 and other circuits. The contact area 312 is subsequently used for electrical connection with its U path, and the alignment hole 314 is used as an alignment mark end system. In addition, please continue to refer to FIG. 3, soft φ q π 9 > Electrically connected to the light source 32. And the soft and flexible circuit boards 3 1 0 are electrically connected. Referring to FIG. 3 and FIG. 4 at the same time, the flexible circuit board 302 has a contact area 306 and a pair of bit holes 308. Therefore, the flexible electrical two plates MO are electrically connected through the two contact areas 30 6 and 312; 妾: $ this continuity. The alignment between the contact area 3006 of the flexible circuit board 3202 and the contact area 312 of the flexible circuit board 0 is aligned through the alignment holes 30.8, 3 丨 4. Therefore, one end of the flexible circuit board 302 is connected to the flexible circuit board 300 configured with the light emitting element 304, and the flexible circuit board 302 is disposed on the flexible circuit board 310, and the flexible circuit board 302 The other end is electrically connected to the contact area 3 1 2 of the flexible circuit board 3 10 through the contact area 3 0 6. Please continue to refer to FIG. 3. The lamp source 3 2 0 of the liquid crystal display device of the present invention is connected to the flexible circuit board 3 2 0 and the flexible circuit board 3 1 0 to obtain power supply from the power system 26. In this way, the liquid crystal display of the present invention

9884twf · ptd Page 11 1224709 V. Description of the invention (7) The light source of the display device 3 2 0 can be used to supply power without using a traditional power cord, and can be directly passed through a flexible circuit board 31 connected to the power system 26 0, and the power is transmitted to the light source 3 2 0 through the flexible circuit board 3 0 2. In this embodiment, the detailed process of soldering the flexible circuit board connected to the light source to the flexible circuit board connected to the power system is described below. FIG. 4 is a schematic top view of an LCD light source and a flexible circuit board used to connect to a functional power system according to a preferred embodiment of the present invention; FIG. 5 is a schematic view of the light source. It is a schematic cross-sectional view from I-Γ and II-II ′ in FIG. 4.

Please refer to FIG. 4 and FIG. 5. The pressure welding process of the liquid crystal display lamp source of this embodiment first provides a flexible circuit board 3 0 0, and then a plurality of light emitting elements 3 0 4 are printed on the flexible circuit board 3 0 0 on. The light emitting element 304 is, for example, an organic light emitting diode or an inorganic light emitting diode. After that, another flexible circuit board 302 is provided. One end of the flexible circuit board 302 is connected to the flexible circuit board 300, and the flexible circuit board 302 has a contact area 306 and a pair of bit holes 308. Here, the contact area 306 is subsequently used for electrical connection with other circuits, and the alignment hole 308 is used for alignment marks.

Among them, as shown in Fig. 5, the flexible circuit board 302 is composed of a polyimide layer (PI) 302a, a circuit layer 302b, and another polyimide layer 302c. The contact area 306 on the flexible circuit board 302 is an area where the polyurethane layer 302a is removed and the circuit layer 302b is exposed. In this embodiment, a conductive layer 307 is formed on the circuit layer 302b of the contact area 306, and a conductive layer is formed on the circuit layer 302b.

9884twf.ptd Page 12 1224709 V. Description of the Invention (8) The method of 307 is to use a plating method or a tin spray method to attach a tin layer to the surface of the circuit layer 302b. After that, please refer to FIG. 4, and provide another flexible circuit board 3 丨. The flexible circuit board 3 1 0 has a contact area 3 1 2 and a pair of bit holes 3 1 4. The 'flexible circuit board 3 1〇' is composed of a polyurethane layer 3 丨 〇a, a circuit ^ 3 1 0b, and another polyurethane layer 3 丨 〇c layer, as shown in FIG. 5 . The contact area 3 丨 2 on the flexible circuit board 3 10 is an area where the polyurethane layer 310a is removed and the circuit layer 310b is exposed.

Then, please refer to FIG. 5 and FIGS. 6A and 6B. FIGS. 6A and 6B are schematic diagrams of a welding process of a light source for a liquid crystal display according to a preferred embodiment of the present invention. The flexible circuit board 302 is placed on the flexible circuit board 310 'and the contact area 306 on the flexible circuit board 302 corresponds to the contact area 316 on the flexible circuit board 310. It is to be noted that the conductive layer 307 on the flexible circuit board 3Q2 is aligned with the exposed circuit layer 31ob on the flexible circuit board 31o. Here, the alignment of the alignment holes 3 08 and 3 1 4 (as shown in FIG. 4) can be used to make the two contact areas 306 and 312 (or the conductive layer 307 and the exposed circuit layer 3 1 0 b ) Can be precisely aligned. y Immediately, a hot pressing step 3 50 is performed to soften the conductive layer 307, so that the contact areas 3 0 6 and 3 1 2 on the flexible circuit board 3 0 2 and 3 1 0 (that is, the exposed circuit) The layers 302b, 310b) are turned on.

= This' In the present invention, the liquid crystal display, the device installation, the lighting source, etc., can be obtained through the connection of the ^ circuit board to obtain external power supply, without the need to use traditional power lines to supply power supply. In summary, the present invention has the following advantages:

1224709 V. Description of the invention (9) 1. The pressure welding process of the liquid crystal display device and the liquid crystal display lamp source of the present invention, because it combines the power supply circuit of the light source and the flexible circuit board connected to the liquid crystal display panel, so Can simplify circuit design, and can improve the aesthetics of the product. 2. The pressure welding process of the liquid crystal display device and the light source of the liquid crystal display of the present invention can simultaneously detect the display function of the liquid crystal display and the power on'off function of the light source, thereby reducing the detection time and increasing the product's productivity. 3. The pressure welding process of the liquid crystal display device and the liquid crystal display lamp source of the present invention, because the power input of the light source uses a flexible circuit board to replace the traditional power line, so the volume occupied by the product can be reduced, and the client can be increased. Use the space to improve the competitiveness of the product. Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

9884twf. Ptd Page 14 1224709 Brief Description of Drawings Figure 1 is a schematic diagram of a conventional LCD display device; Figures 2 A and 2 B are top and side views of a conventional pressure welding process for a LCD light source Fig. 3 is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention; Fig. 4 is a liquid crystal display light source according to a preferred embodiment of the present invention and a soft circuit connected to a power system by using ' A schematic view from above the board; FIG. 5 is a schematic cross-sectional view from Γ-Γ and 11-11 ′ in FIG. 4; and FIGS. 6A to 6B are the steps of the welding and pressing process of a lamp source according to the present invention. schematic diagram. The standard does not indicate 10:: LCD panel 12, '300, 302 31 0: flexible circuit board 14 power line 11 display area 13 non-display area 16 functional system 18 power system 26 power system Jiang charge 1 0 0: printed circuit board 1 0 1, 3 2 0: Light source 102, 304: Light emitting element

9884twf. Ptd Page 15 1224709 Brief description of the drawings 1 04, 3 0 7: Tin 3 0 8, 3 1 4: Alignment holes 3 0 6, 3 1 2: Contact areas 302a, 302c, 310a, 310c: Juya Amine layer 3 0 2 b, 31 Ob: circuit layer 3 5 0: hot pressing step limn 9884twf. Ptd page 16

Claims (1)

1224709 VI. Scope of patent application 1. A liquid crystal and a non-display, a light source, a first display panel electrical system, a second electrical connection, a circuit board, a liquid crystal display display panel, a zone, and is disposed in the soft The circuit board is connected to the second, the second, the second, and the second, the second, the third, the fourth, the fourth, the lamp, and the fifth. The patented circuit is a soft first flexible circuit. The first flexible circuit is connected to the Shenyuan system, and if the circuit board is applied for a circuit board, the patented circuit board has a contact area. The patent includes: a circuit board, a second circuit board, a circuit board, a circuit board, and a second force system, including: the liquid crystal display panel has a liquid crystal display region; In the non-display area of the display panel, the first flexible circuit board and the liquid crystal connect the liquid crystal display panel to a power, and the second flexible circuit board is connected to the light source flexible circuit board. A first flexible disposed in the flexible circuit board is electrically connected. The liquid crystal display device according to item 1, one end of which is electrically connected to the liquid crystal display panel, and the other end of which is electrically connected to the power system, has a first contact area to be connected to the liquid crystal display panel. The liquid crystal display device described in item 2 has one end electrically connected to the light source, and the second contact area is connected to the liquid crystal display device described in item 1 of the first flexible circuit board. The first flexible circuit board obtains power supply. The liquid crystal display device according to item 1, which 9884twf.ptd Page 17 1224709 VI. Patent application scope-a third flexible circuit board; and a plurality of light emitting elements arranged on the third flexible circuit board; wherein the third flexible circuit board is connected to the second flexible circuit board One end is electrically connected. 6. The liquid crystal display device according to item 1 of the scope of patent application, wherein the light emitting elements include a plurality of organic light emitting diodes or a plurality of inorganic light emitting diodes. 7. The liquid crystal display device according to item 1 of the scope of patent application, wherein the first flexible circuit board further includes a first alignment hole, and the second flexible circuit board further includes a second alignment hole. . 8. A soldering and pressing process for an LCD light source, comprising: providing a first flexible circuit board, wherein the first flexible circuit board has a first contact area, and the first flexible circuit board is connected to a power system; Provide a second flexible circuit board, and the second flexible circuit board has a second contact area, and the second flexible circuit board is electrically connected to a light source; the second flexible circuit board is placed on On the first flexible circuit board, so that the first contact region corresponds to the second contact region, and a conductive layer is formed between the first contact region and the second contact region; and on the second flexible circuit A hot-pressing step is performed on the board to soften the conductive layer to make the first contact area and the second contact area conductive. The light-emitting elements are connected to the first flexible circuit through the second flexible circuit board. The board is connected, and the power supply is obtained from the power system. 9884twf.ptd Page 18 1224709 6. Application for patent scope 9. The welding process of the LCD lamp source as described in item 8 of the scope of patent application, wherein the first flexible circuit board is connected to a liquid crystal display panel so that The power system drives the liquid crystal display panel. 10. The welding process of the liquid crystal display lamp source as described in item 8 of the scope of patent application, wherein the material of the conductive layer includes tin. 1 1. The welding process of the lamp source of the liquid crystal display according to item 8 of the scope of the patent application, wherein the method for forming the conductive layer includes an electroplating method or a tin spray method. 12. The soldering process of the liquid crystal display lamp source as described in item 8 of the scope of patent application, wherein the hot pressing step is directly applying a temperature and pressure to the second flexible circuit board with a hot pressing head. 1 3. According to the soldering process of the liquid crystal display lamp source described in item 8 of the scope of patent application, wherein the first flexible circuit board further includes a first alignment hole formed, and the second flexible circuit board further includes A second alignment hole is formed to assist the alignment of the first contact area and the second contact area. 1 4. The welding and pressing process of a light source for a liquid crystal display according to item 8 of the scope of patent application, wherein the method of forming the light source includes punching a plurality of light-emitting elements on a third flexible circuit board, and the third The flexible circuit board is electrically connected to the second flexible circuit board. 1 5. According to the welding process of the liquid crystal display lamp source described in item 14 of the application scope, wherein the light-emitting elements include a plurality of organic light-emitting diodes or a plurality of inorganic light-emitting diodes. 9884twf. Ptd Page 19