JP3789732B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a liquid crystal display device used for home appliances and the like.
[0002]
[Prior art]
In the case of a rice cooker as an example of a home appliance, a liquid crystal display device is provided on the jar body or its lid to display various types of rice cooking information. This liquid crystal display device generally has a display substrate, a liquid crystal mounted thereon, and a frame member that couples the display substrate and the liquid crystal. In some cases, a backlight plate is interposed between the display substrate and the liquid crystal, and the backlight plate is irradiated with light from a light-emitting element attached to the frame member to illuminate the liquid crystal.
[0003]
In order to prevent the liquid crystal, the backlight plate and the frame member from touching the solder directly in the soldering process when manufacturing the liquid crystal display device, and to protect these components from the heat of the solder, the display substrate described above Thus, the lower surfaces of these parts are covered .
[0004]
[Problems to be solved by the invention]
In various home appliances in which the liquid crystal display device as described above is used, downsizing is often required. However, since the conventional liquid crystal display device has a flat shape and is sufficiently downsized, no measures for further downsizing have been taken.
[0005]
On the other hand, a board on which various electronic components are mounted may be divided into a control board and a display board, and a design may be performed in which these boards are installed at positions that are separated from each other. In the display substrate when the substrate is divided as described above, the area where the charging part (the pin part of the liquid crystal end part, the connector part, the circuit pattern connecting between them, the part where the electrical signal flows) is provided in terms of area Most of the remaining portions are non-charged portions facing the liquid crystal (a backlight plate superimposed on the back surface of the liquid crystal when the backlight is irradiated). The display substrate that forms the charging unit and the non-charging unit also has a function of protecting components such as a liquid crystal, a backlight plate, and a frame member from heat during the soldering process.
[0006]
The frame member is provided with a mounting screw seat projecting outward. The lower surface of the frame member is covered by a part of the non-charging portion in order to protect the screw seat from the heat of the solder. I am doing so.
[0007]
As described above, it is natural that the non-charged portion in the display substrate has a function of maintaining the strength of the display substrate itself. However, except for this point, the components are exclusively protected from the heat of the solder. It can be said that the function has significance. Then, it can be said that the non-charged portion of the display substrate is a portion that can be omitted after the soldering process is finished, except for a portion necessary for maintaining the strength of the display substrate.
[0008]
Accordingly, the present invention provides a method for manufacturing a liquid crystal display device that enables a space-saving design by focusing on the non-charged portion of the display substrate and reducing the size of the liquid crystal display device and reducing the occupied volume. Let it be an issue.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a display substrate, a liquid crystal mounted on the display substrate, and a method of manufacturing a liquid crystal display device having a frame member that couples the display substrate and the liquid crystal. And an ablation substrate portion made up of a non-charging portion, which are partitioned by an easy cutting line , and a charging portion is provided on the charging substrate portion, and the ablation substrate portion is opposed to the lower surface of the liquid crystal or the frame member, After the soldering process, the excised substrate part was cut and removed at the portion of the above easy cutting line .
[0010]
According to the manufacturing method of the above SL, can be realized only compactness Hakare space saving of a liquid crystal display device the volume of the cut substrate portions, yet, never interfere with the soldering process in the manufacturing process.
[0012]
Also, screw seats are provided to project outwardly on each of the two parallel sides of the frame member, the one screw seat projects onto the charging board portion, and the other screw seat projects onto the excision board portion. Can be configured. In this case, if both screw seats are respectively provided on the parallel short sides of the frame member, only the charging board portion facing one screw seat of the screw member protrudes outward from the short side of the frame member, but remains. Thus, the display substrate does not protrude from the three sides.
[0013]
Note that a backlight plate may be interposed between the display substrate and the liquid crystal.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with respect to a rice cooker as an example of home appliances shown in the accompanying drawings. The rice cooker according to the first embodiment shown in FIGS. 1 to 4 has a jar body 1 and a lid 2 attached to the jar body 1 so as to be openable and closable, and a display surface of the liquid crystal display device 4 through a transparent panel 3 of the lid 2. Can see. The jar body 1 is provided with various operation switches 6 and the like, and an open / close button 7 of the lid 2 is provided on the trunk portion thereof.
[0015]
FIG. 2 shows details of the mounting portion of the lid 2 on the liquid crystal display device 4. The lid 2 is obtained by integrally covering a lid upper plate 12 on an upper portion of a lid main body 11 incorporating a steam passage set 8 and a steam hole set 9 for pressure adjustment, and a heat radiating plate set 13 is attached to the lower surface of the lid main body 11. It is done. The heat sink hook 14 attached to the front end portion of the lid body 11 is engaged with the locking claw 16 of the heat sink ring 15, whereby the heat sink set 13 is detachably engaged. The lid hook 17 attached coaxially to the heat radiating plate hook 14 is operated via a hook lever 18 connected to the opening / closing button 7 (see FIG. 1). The lid 2 is detachably engaged with the jar body 1 by the lid hook 17. A part of the lid hook 17 is provided with a support piece 21 that receives the end of the biasing spring 19 of the lid hook 17.
[0016]
The liquid crystal display device 4 is fixed to the mounting recess 22 of the lid upper plate 12 with screws 20 (see FIG. 3). The liquid crystal display device 4 includes a display substrate 23, a backlight plate 24 (see FIG. 4 (b)) mounted on the upper surface thereof, a liquid crystal 25 superimposed on the backlight plate 24, and a frame member for integrating them. 26. The frame member 26 has four engaging claws 27, thereby integrating the above-described members. One long side of the frame member 26 is provided with a pair of screw seats 30 and 30 through which the screw 20 is inserted.
[0017]
An LED (not shown) for irradiating the backlight plate 24 is attached to the inner surface of the frame member 26. In addition, a connector 28 is provided on a part of the display substrate 23 protruding outward from the long side of the frame member 26 provided with the screw seat 30, and the jar body 1 side is connected through a flat cable 29 connected thereto. It is connected to a control board (not shown).
[0018]
The display substrate 23 is formed with a rectangular cut portion 33 opened on one side thereof. The cut portion 33 is a portion where the display substrate 23 is cut over the entire thickness, and the back surface of the backlight plate 24 is exposed from the cut portion. The cut-out portion 33 is formed in a portion of the display substrate 23 that avoids the charging portion, and its width and shape are set in a range that maintains the strength of the display substrate 23 including the charging portion.
[0019]
A flat convex portion 34 fitted into the cut portion 33 from below is provided in the mounting recess 22 (see FIG. 4B), and a storage space 35 is formed on the lower surface of the flat convex portion 34. In this embodiment, a part of the support piece 21 of the lid hook 17 is stored in the storage space 35 (see FIG. 2). In the conventional structure in which the cut portion 33 is not provided, the height of the lid 2 must be increased by the amount of the support piece 21. In the present invention, the support piece 21 is placed in the storage space 35. By storing, it is not necessary to raise the lid 2.
[0020]
In the above description, the liquid crystal display device 4 attached to the lid 2 has been described. However, even when the liquid crystal display device 4 is attached to the jar body 1, the occupied volume is reduced by the cut portion 33. Can contribute.
[0021]
When the cut-out portion 33 as described above is provided on the display substrate 23, after the assembly of the liquid crystal display device 4 is finished, the backlight plate 24 and Since the liquid crystal 25 may be damaged, the following measures are taken in the actual manufacturing process.
[0022]
That is, as shown in FIG. 4C, an original substrate 42 on which a pair of display substrates 23 and 23 is formed is prepared. In the middle of the original substrate 42, an easy cutting line 37 composed of a continuous small-diameter hole is formed. Each display substrate 23 is partitioned by the easy cutting line 37. In each display substrate 23, a bent easy cutting line 40 composed of a separating portion 38 and a continuous portion 39 is formed between both ends. The easy cutting line 40 includes both end portions 40a parallel to the easy cutting line 37 at both ends and a U-shaped portion 40b formed inside thereof. The U-shaped portion 40b is the shape of the cut portion 33. Matches.
[0023]
Each display board 23 is divided into the charge board part 23a and the cut-out board part 23b by the easy cutting line 40 described above. The charging board part 23a is provided with the charging part, and the excision board part 23b is not provided with a charging part, that is, a non-charging part.
[0024]
When the pair of liquid crystal display devices 4 are assembled using the pair of display substrates 23 as described above and passed through the solder bath as they are, the backlight plate 24 and the liquid crystal 25 are protected by the display substrate 23, so that the soldering process can be performed without any trouble. It can be performed. After the soldering process is completed, the display substrate 23 is divided into two by an easy cutting line 37, and the excision substrate portion 23b is cut and removed at the portion of the easy cutting line 40, whereby the aforementioned excision portion 33 is formed.
[0025]
During the soldering process, the tip of the engaging claw 27 of the frame member 26 comes into contact with the solder and is partially melted, but the melting is not so much that the coupling action by the engaging claw 27 is lost. In addition, after the liquid crystal display device 4 is attached to the lid 2 with the screw 20, the coupling action by the engaging claw 27 is not necessary, so that even if it is partially melted, no trouble is caused. .
[0026]
Next, a second embodiment will be described based on FIGS. In this case as well, as described above, it is attached to the lid 2 of the rice cooker, and its mounting structure is the same as that described above. As shown in FIGS. 5 and 6, the liquid crystal display device 4 also includes a liquid crystal 25, a backlight plate 24, and a display substrate 23 that are integrally coupled by a frame member 26, and a pair of mounting recesses 22 of the lid 2. The bosses 41 and 41 ′ are attached by screws 20 and 20.
[0027]
Also in this case, as shown in FIG. 7, an original substrate 42 on which a pair of display substrates 23 and 23 is formed is used. In the original substrate 42, an easy cutting line 43 in the vertical direction is formed along one side, and an intermediate easy cutting line 44a is formed in a direction orthogonal to the easy cutting line 43, along both upper and lower ends. Upper and lower easy cutting lines 44b and 44c are formed.
[0028]
A cut-out substrate portion 45a common to both the display substrates 23, 23 is formed outside the above-described easy cut line 43 in the vertical direction, and cut-out substrate portions 45b, 45c are respectively formed outside the upper and lower easy cut lines 44b, 44c. Is formed.
[0029]
Each display board 23 is provided with a charging unit including the connector 28 to become a charging board part, and each of the cut board parts 45a to 45c is a non-charging board part.
[0030]
The frame member 26 is formed in a rectangular shape, and is combined so that the long side thereof is parallel to the easy cutting lines 44a to 44c. Each frame member 26 is provided with one screw seat 30, 30 ′ on both short sides thereof (see FIGS. 7 and 8). Among these, one screw seat 30 is formed on the cut-out substrate portion 45a, and the other screw seat 30 'is formed near the connector 28 on the display substrate 23 which is a charging substrate portion. (See FIG. 8).
[0031]
The assembly in which the liquid crystal 25 and the backlight plate 24 are coupled by the frame member 26 is made to correspond to each display substrate 23, 23 on the original substrate 42, and the plurality of engaging claws 27 of the frame member 26 are attached to the original substrate 42. It is inserted into the engagement hole 46 and engaged. Then, the solder treatment is performed through the solder tank. Each component including the screw seat 30 is protected from the heat of the solder by the presence of the original substrate 42.
[0032]
After the soldering process, as shown in FIG. 8, the cut substrate portions 45a to 45c are cut and removed by the easy cutting lines 43 and 44a to 44c.
[0033]
When the liquid crystal display device 4 manufactured as described above is attached to the attachment portion 22 of the lid 2, one screw seat 30 is directly attached to the boss portion 41 by the screw 20 without going through the display substrate 23. Further, the other screw seat 30 ′ is attached to the other boss portion 41 ′ via the display substrate 23 (see FIG. 6). The height of the boss portions 41 and 41 ′ is different by the thickness of the display substrate 23.
[0034]
In FIG. 6, reference numeral 47 denotes a transparent character display sheet provided on the upper surface of the liquid crystal 25.
[0035]
The second embodiment is as described above, and the screw seat 30 protruding outward from one short side of the frame member 26 and the other protruding portions are protected by the cut substrate portions 45a to 45c during the soldering process. In addition, since the cut substrate portions 45a to 45c are cut and removed after the soldering process, the occupied volume of the liquid crystal display device 4 is reduced by the removed amount.
[0036]
The liquid crystal display device 4 when this, as is apparent in FIGS. 5 and 8, but there are protruding portions of the display substrate 23 on the outer side of one of the short sides of the frame member 26, the remaining three sides Is cut and removed along the side of the frame member 26. Since the protruding portion of the display substrate 23 is on the short side of the frame member 26, the display substrate 23 is made more compact than in the case of the first embodiment in which the protruding portion remains on the long side.
[0037]
【The invention's effect】
As described above, according to the present invention, the cutout substrate portion is provided on the display substrate provided separately from the control substrate on the portion facing the liquid crystal (including a backlight plate) or part of the lower surface of the frame member. since the formation of the, without interfering with the soldering process, and because after the soldering process was to be cut and removed the cut substrate portions, the volume occupied rate is reduced in the liquid crystal display device, the design of space-saving It becomes possible.
[Brief description of the drawings]
FIG. 1 is a perspective view of a rice cooker according to a first embodiment. FIG. 2 is an enlarged cross-sectional view of the lid portion of the same. FIG. 3 is an exploded perspective view of the lid portion of the same. (B) An enlarged cross-sectional view of the liquid crystal display device part (c) A plan view of the original substrate [FIG. 5] An exploded perspective view of the cover part of the second embodiment. [FIG. (B) Cross-sectional view at another position of the lid portion of the same. [FIG. 7] Exploded perspective view of the same assembling. [FIG. 8] Plan view of the same assembling.
DESCRIPTION OF SYMBOLS 1 Jar body 2 Cover 3 Transparent panel 4 Liquid crystal display device 6 Operation switch 7 Open / close button 8 Steam passage set 9 Steam hole set 11 Cover body 12 Cover top plate 13 Heat sink plate 14 Heat sink plate 15 Heat sink plate 16 Locking claw 17 Lid hook 18 Hook lever 19 Energizing spring 20 Screw 21 Support piece 22 Mounting recess 23 Display board 23a Charging board part 23b Cutting board part 24 Backlight plate 25 Liquid crystal 26 Frame member 27 Engaging claw 28 Connector 29 Flat cables 30, 30 'Screw seat 31 Pin 32 Terminal 33 Cut part 34 Flat convex part 35 Empty space 37 Easy cutting line 38 Separating part 39 Connecting part 40 Easy cutting line 40a Both ends 40b U-shaped parts 41, 41' Boss part 42 Original substrate 43 Easy cutting line 44a-c Easy cutting line 45a-c Cut substrate part 46 Engagement hole 47 Character display sheet

Claims (2)

A display substrate, the liquid crystal to be mounted thereto, in the method of manufacturing a liquid crystal display device having a frame member that couples the display substrate and the liquid crystal, the display substrate and the charging substrate portion, and a cut substrate portion made of a non-charging portion formed by partitioned by easily cutting line, provided with a charging unit to the charging base plate portion, the cut substrate portion opposition to the lower surface of the liquid crystal or the frame member, the above-mentioned easy cutting lines the sections divided board portions after soldering A method for manufacturing a liquid crystal display device , comprising: A screw seat projecting outwardly on each of the two parallel sides of the frame member, the one screw seat projecting on the charging board part, and the other screw seat projecting on the excision board part The method for manufacturing a liquid crystal display device according to claim 1, wherein:

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