JPH03243922A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent a liquid crystal display defect by coating the surface of a liquid crystal display plate with a transparent synthetic resin having a moistureproofing property so that the liquid crystal display plate is kept free from moisture. CONSTITUTION:The liquid crystal display plate 15 is constituted by providing connecting terminal pins 21 for connecting both transparent electrodes to the outside on the edge part of a glass substrate. An outside case 17 is formed of the transparent hard synthetic resin 19 and the liquid crystal display plate 15 is housed in the outside case 17 by directing the display surface toward the inside base of the outside case 17. A back light 16 formed of the luminous body of EL is disposed on the rear surface of the liquid crystal display plate 15. The liquid crystal display plate 15 is provided with the connecting terminal pins 21 for the back light not connected to both transparent electrodes and the energization of the back light 16 is connected to an external circuit via the connecting terminal pins 21 for the back light. Since the surface of the liquid crystal display plate 15 is coated with the transparent synthetic resin 19 having the moistureproofing property, the moisture is prevented by the synthetic resin. The liquid crystal display plate 15 is kept free from the moisture and the generation of the liquid crystal display defect is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a product liquid crystal display device used in a humid place such as a washing machine.

[Conventional technology]

Currently, liquid crystal displays are used in automobiles, word processors, and televisions because of the richness and ease of display information they display.

It is used in all kinds of products such as office automation equipment, cameras, and watches, and the number of applications is rapidly increasing. It has also attracted attention in the home appliance industry, where there are many types of products, and has been adopted in some products. However, since the liquid crystal display section including the bank lighting is sensitive to moisture, it has been considered difficult to use it as a product for use under these conditions.

Recently, we have seen examples of products being subjected to moisture-proofing treatment as needed and being assembled into products, but the moisture-proof structure and workability with 8I are still far from perfect. For example, to briefly introduce the structure of incorporating a liquid crystal display in electronic rice cookers, rice cookers, etc. that are used in environments such as steam or rain, a single liquid crystal or a liquid crystal with backlighting is directly attached to the product control board. The entire product is placed in a container and covered with a lid, but a gasket made of rubber or the like is placed at the joint between the container and the lid and tightened with numerous screws Ia.
Maintaining secrecy. In addition, the cable outlet from the control board is sealed with elastic casting silicone rubber, etc., assuming that it will be moved at all times. Furthermore, in order to completely remove moisture, some devices include a desiccant inside the container that houses the liquid crystal display.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, it is difficult to maintain the confidentiality inside the container due to the smoothness accuracy of the joint surface between the container and the lid, or variations in the coating work of silicone rubber at the cable outlet. In addition, since the inside of the container is filled with air, the volume of the air changes depending on the temperature difference in the outside air, causing pinholes in the partition wall of the container, minute gaps in the joint surface between the container and the lid, and air bubbles in the silicone rubber coating area. This is not perfect as a breathing effect occurs between the containers and moisture enters the container, and products such as washing machines that are used in extremely humid and humid locations are insufficient.

The purpose of the present invention is to provide a sealed structure for a liquid crystal display section that can be safely used even in extremely wet or humid products such as washing machines, a total of 9 assembly positions, and a method for connecting the liquid crystal display section and a control board that controls the product. and the content displayed on the liquid crystal.

[Means to solve the problem]

In the present invention, an upper glass substrate and a lower glass substrate are provided to face each other, transparent electrodes are provided on the inner opposing surfaces of both glass substrates, and a liquid crystal substance is placed between both transparent electrodes to form a liquid crystal material inside both glass substrates. The liquid crystal display board is constructed by providing connection terminal pins on the edge of the glass substrate to connect both transparent electrodes to the outside, and the outer case is made of transparent hard synthetic resin. The liquid crystal display board is stored in the outer case with the display surface facing toward the outside, and a backlight made of EL light emitting material is placed on the back of the liquid crystal display board. The liquid crystal display device is characterized in that a connection terminal pin is provided, and the backlight is energized by being connected to an external circuit through the connection terminal pin for the backlight.

[Effect]

Since the surface of the liquid crystal display board is coated with a moisture-proof transparent synthetic resin, moisture is prevented by the synthetic resin, the liquid crystal display board will not become damp, and no liquid crystal display defects will occur.

〔Example〕

An embodiment in which the present invention is applied to a washing machine will be described below based on the drawings. The washing machines shown in FIGS. 1 and 2 are fully automatic washing machines, and are the same washing machine except that the shape of the operation panel is different. A bifold outer lid 2 is provided on the top of a washing machine main body 1. The outer lid 2 is opened by folding it backwards. There is an operation panel on the front side of the outer lid 2. It was placed on the front side to make it easier to operate the washing machine.

The washing machine shown in FIG. 1 has a liquid crystal display section 3 on the left side of the operation panel. The operating section M4 is located on the right side. By opening the lid 4, the operating section 5 can be operated. The reason why the display section 3 is placed on the left side is to make it easier for users who use their right hand to see, and to prevent water from splashing on the laundry when taking it out of the washing machine. This is because the liquid crystal display section 3 is generally sensitive to water and needs to be protected from water as much as possible.

The washing machine shown in FIG. 2 has a liquid crystal display section 3 on the inside surface of the lid 4.
is installed. In this case, the lid 4 is located at the center of the operation panel. By closing the lid 4, water is less likely to splash onto the liquid crystal display section 3, and when the lid 4 is opened, the liquid crystal display section stands up, making it easier to see.

Liquid crystal display section incorporated into the operation panel 3. The operation section 5 will be explained with reference to FIGS. 3 to 9. What is described here has an arrangement that can be applied to the washing machine shown in the drawing.

As shown in the exploded view in Figure 3, the control operation section of the washing machine is as follows:
It consists of a control unit and an operation unit. The control unit is composed of a control board 6 and a display section 3.

The operating unit is formed by an operating section 5 of a membrane switch. The control board 6 and the display section 3 are incorporated into a board case 7 and are integrated into one.

The operation part 5 is FPC8 (flexible, pattern).

It is connected to the control board 6 with a cable) and functions as a control operation section of the washing machine.

The illustration in FIG. 3 shows a state in which the control operation section is turned over and disassembled. When incorporated into an operation panel and used, the display section 3 is placed on the upper side.

The control board 6 includes a power transformer 9. Buzzer 10.
Condenser 1. Microcomputer chip 12° connector housing 13. Various electrical parts such as a fixed connector 14 are installed, and the mounting feet of the various electrical parts are connected to the control board 6.
It is soldered to the back side.

The display section 3 includes a liquid crystal display panel 15. Backlight 16 (EL)
, outer case 17. It is composed of an inner case 18. The liquid crystal display board 15 and the backlight 16 are mounted on the outer case 17. It is covered with an inner case 18 and a transparent composite film 19 to maintain a seal with the outside air.

Support pins 20 are provided at the four corners of the outer case 17. A large number of connection terminal pins 2↓ are provided on one side of the liquid crystal display board 15.

A support pin engagement hole 22 is formed in the control board 16 to correspond to the support pin 20. Connection terminal pin 21
A connection pattern 24 for connecting the connection terminal pin 21 is formed on the back surface of the control board 16 adjacent to the insertion hole 23 of the control board 16 . Although the insertion hole 23 and the connection pattern 24 are omitted in FIG.
They are set in the same number or in large numbers.

The display unit 3 is attached to the control board 16 by inserting the support pin 20 into the support pin engagement hole 22 of the control board ↓6. During this installation, positioning is performed so that each connection terminal pin 21 is inserted into a predetermined insertion hole 23. Connection terminal pin 21
The contact portion of the connection pattern 24 is fixed by soldering.

The support pin 20 has a removal stopper 25 formed at its tip. Since the support pin 20 is pushed into the support pin engagement hole 22 and the removal stopper 25 is located on the opposite side of the control board 16, the support pin 20 does not easily come off from the support pin engagement hole 22.

After the display section 3 and the control board 6 are combined into one in this way, they are inserted into the board case 7 and subjected to a potting process, which will be described later, to form a control unit.

The operation section 5 of the membrane switch includes a metal substrate 26, a pattern section 27. It is composed of a contact sheet 28. A contact chamber 30 is provided around the contact 29. Contact 29
The switch is activated when pressed from above, and turned off when the finger is removed.

A lead connection land 31 is provided corresponding to each contact 29, and a terminal 32 of the FPC 8 is soldered thereto to connect the FPC 8 and the operating section 5. Connect the connector 33 provided at the other end of the EPC 8 to the fixed connector 1 of the control board 6.
4, the connection between the operating section 5 and the control board 6 is established.

Next, the display section 3 will be explained in more detail.

Figure 5 shows the display section 3 from the front.

The washing operation is displayed by applying a control signal from the control board 6 to the liquid crystal display panel 15. When the control signal stops, the display disappears. Depending on the content of the control signal, the display content may be changed or limited to a partial display. Washing, rinsing, and dehydration are displayed as an operation and progress display 34, which is placed at the top. The progress time of each operation is indicated by the remaining time.

Displays for sensor standard, laundry, wool, etc. are arranged together on the left side as a washing course display 35.

Displays related to reservations including time are arranged at the lower right side as a reservation display 36° and a timer display 37. The water level display 38 is placed at the lower center.

The reason for arranging the washing machine in this way is to make it easy to understand the functions and displays of the washing machine at a glance, as well as to simplify the arrangement of the liquid crystal patterns.

The display section 3 has the above-described structure, but is molded with synthetic resin to have an integral structure. The liquid crystal display panel 15 and backlight 1 are integrally molded.
This is to seal 6 from the outside air. Liquid crystal display board 15.
Backlight (E, L.

Electron Luminance) 16 is sensitive to water and moisture.

This is because the display function and lighting function are lost due to humidity.

Here, the synthetic resin mold of the display section 3 will be explained.

As shown in FIGS. 6, 8, and 9, the overlapping liquid crystal display panels 15. Put the backlight 16 into the outer case 17. The inner case 18 is placed on the backlight 16. Since positioning ribs 39 and 40 are provided at the corners of the inner bottom of the outer case 17, the liquid crystal display panel 15 is placed slightly above the inner bottom surface of the outer case 17. Moreover, the liquid crystal display panel 15 is placed inside so as to lean against the inner wall of the outer case 17 with a predetermined gap.

The liquid crystal display panel 15 is not provided with the positioning ribs 39 and 40.
can be made to float slightly from the inner bottom surface of the outer case 17. That is, the liquid crystal display board 15 and the backlight 16
Glue the backlight 16 using adhesive 2 double-sided adhesive tape.

It is attached to the inner case 18 using double-sided adhesive tape, a hook is made at the end of the inner case 18, and the hook can be held on the upper edge of the outer case 17, thereby making it floating.

Now, the inner case 18 into which the liquid synthetic resin material is first injected.
There are three wall parts 41. - There is no wall portion 41 on the side.

The liquid synthetic resin material injected into the inner case 18 is applied to the wall portion 4.
The synthetic resin film 19 is formed so as to surround the liquid crystal display panel 15 and the backlight 16, flowing as shown by the arrows in FIG. This synthetic resin film 1
9, liquid crystal display board 15. The backlight 16 is kept sealed from the outside air.

The inner case 18 may be provided with wall portions 41 on four sides, and one wall portion may be provided with an outlet through which the liquid synthetic resin material flows out.

Liquid crystal display board 15. If only wrapping the backlight 16 with the synthetic resin film 19 is considered, it is unnecessary to use the inner case 18 or to consider the flow of the liquid synthetic resin material. This was devised to avoid the formation of bubbles in the synthetic resin film 19.

If air bubbles are present in the synthetic resin film 19, the display becomes difficult to see. Since the clarity of a liquid crystal display is lower than that of a CRT display, air bubbles particularly affect the visibility of the display.

Let's briefly touch on bubble generation here. Inner case 1
If the liquid synthetic resin material flows into the space between the outer case 17 and the liquid crystal display board 15 all at once from around the liquid crystal display board 15 without using the liquid crystal display board 15, there will be no place for the air in the space to escape, and this air will flow into the synthetic resin. It gets mixed into the film 19, resulting in poor appearance.

Therefore, an inner case 18 is provided, and a liquid synthetic resin material is poured into it from one side. By doing this, the air existing in the space between the outer case ↓7 and the liquid crystal display panel 15 is pushed out by the liquid synthetic resin material flowing in from one side. The space is filled only with liquid synthetic resin material, and no air is mixed in.

Without air intrusion, not only visibility is improved, but sealing performance is also improved. If air bubbles are present, this is not a good idea as it creates a path for outside air to enter. From this point of view as well, it is wise to suppress the generation of bubbles.

The reason why the wall 41 of the inner case 18 is removed along the entire length of one side is to speed up the flow of the liquid synthetic resin 10 flowing out from the inner case 18. From the viewpoint of further suppressing the generation of bubbles, it is desirable to cut out the center of the wall 41 as an outlet.

Note that the outlet is preferably provided on the long side of the inner case 18. - The same applies when removing the side walls 41 to create a large outlet. This is because the air in the space is effectively pushed out. That is, the liquid synthetic resin material flowing down from one side and flowing into the space tends to push air outward. This is because if the outlet is provided on the short side, the liquid synthetic resin material may run into the gap between the outer case ↓7 and the liquid crystal display panel 15, which may impede the discharge of air from the space. Furthermore, it takes time for the liquid synthetic resin material to reach the far end from the outlet, and there is a possibility that the liquid synthetic resin material hardens and obstructs the flow, preventing the liquid from flowing around.

It is also conceivable to fill the inner case 18 with a liquid synthetic resin material to suppress the generation of air bubbles. This can be achieved by positioning the gate I of the injection device that flows out the liquid synthetic resin material directly above the gap formed between the outer case 17 and the outer periphery of the liquid crystal display panel 15.

The liquid synthetic resin material flowing out from the gate flows into the outer case 17 from one side of the gap, and further flows through the space between the outer case 17 and the liquid crystal display panel 15 as shown by the arrow in FIG. A synthetic resin film 19 is formed to cover the display panel 15 and the backlight 16. Since the liquid synthetic resin material fills the space while pushing out air from one side, no air bubbles are mixed into the synthetic resin film 19.

Liquid crystal display board 15. Backlight I/16 connection terminal pin 2
1 is covered with a synthetic resin film 19 from the base to the middle, so that the base of the connection terminal pin 21 is also sufficiently sealed. The reason why the connecting terminal pin 21 is placed on the side into which the liquid synthetic resin material is poured is to allow the liquid synthetic resin material to adhere well to the connecting terminal pin 21. Since the liquid synthetic resin material hardens over time, the sealing performance will be improved if the connection terminal pin 21 is wrapped in the soft liquid synthetic resin material as soon as possible.

The backlight 16 is provided to make the display on the liquid crystal display board 15 easier to see. It is also possible to use only the liquid crystal display panel 15 without attaching the backlight 16. In this case, only the liquid crystal display panel 15 is covered with the synthetic resin film ↓9.

Further, the liquid crystal display panel 15 and the backlight 16 do not need to be directly stacked. Liquid crystal display board 15 and backlight 6
The synthetic resin film 19 may be wrapped by interposing a spacer or the like. In this case, a synthetic resin film is formed between the two.

The display section 3 is for viewing the display contents of the liquid crystal display board 15 from the surface of the outer case 17. Naturally, it is desirable that the outer case 17 be highly transparent, and a synthetic resin material such as acrylic resin is used. Since the inner case 18 does not serve as a display surface, it may be made of materials other than transparent resin.

The outer case 17 has a liquid crystal display panel 15. Since it also serves as a protective case for the backlight 16, it is desirable to use a durable hard material. Any synthetic resin other than acrylic resin may be used as long as it is hard and highly transparent. Also, hard ones
It also prevents scratches and maintains a high-quality display.

As the synthetic resin film 19, a silicone gel synthetic resin material was used. Silicone gel is highly transparent, has rubber-like softness, and is airtight. Although a highly transparent epoxy resin may be used, it is more desirable to use an epoxy resin that also has softness. Although hard synthetic resin is durable, it may damage the liquid crystal display panel 15 due to heat shrinkage.

The liquid crystal display panel 15 has a structure in which a liquid crystal material is sealed between two glass plates, and a polarizing film is attached to the glass plates.

When forming the synthetic resin film 19, liquid synthetic resin is injected into the outer case 17. As the resin cools and hardens, the synthetic resin contracts. This thermal contraction rate is greater than that of the glass plate of the liquid crystal, and there is a risk that the glass plate may be damaged. Therefore, by using a material such as silicone gel that remains soft even after hardening, it is possible to prevent the glass plate from being damaged. By the way, silicone gel is injected at room temperature,
In order to speed up the curing time, it is heated at 70'C. Even if there is shrinkage due to cooling and hardening, the silicone gel is soft and will not cause damage to the glass plate.

Since the display section 3 displays various operating information of the washing machine, the display surface must be large. By the way, display section 3
The length in the longitudinal direction is 13■, the length in the transverse direction is 4a11
A size with a rectangular shape of about 100 mL is required. Further, the thickness of the synthetic resin film 19 was set as follows in consideration of the flow of the liquid synthetic resin material, prevention of bubble generation, and sealing performance. LCD display board 1
The gap between 5 and the inner bottom of outer case 17 is 0.31111.
11 to 2 m, and the gap between the liquid crystal display board 15 and the side wall of the outer case 17 is 1 m or more on the longitudinal side and 0.5 m on the transverse side.
Reduced to n or less. It is desirable that the wall thickness on the side opposite the display surface be slightly larger than that on the front side.

Here, the reason for applying a seal to the liquid crystal display panel 15 will be briefly explained.

The liquid crystal material placed between the two glass plates is sealed with adhesive to prevent the liquid crystal material from leaking out. Exposure to moisture does not affect the seal. The polarizing sheet attached to the glass plate is sensitive to moisture. When exposed to moisture, the polarizing sheet does not immediately lose its function as a polarizing sheet; when viewed from the surface, it becomes white and loses its polarizing effect. When using a liquid crystal display device in a humid place such as a washing machine, it is absolutely necessary to protect the liquid crystal display panel 15 with a seal.

The soldering of the connection terminal pin 21 and the connection pattern 24 has been described above, but a little more explanation will be added.

As shown in FIG. 9, the connection terminal pin 21 is inserted into the insertion hole 23 of the control board 6, and the soldering part 42 is applied to the connection pattern 24. Since it is not possible to enter a soldering bath for this soldering work, an automatic soldering machine is used. To facilitate this work, the connecting pin 21 is bent twice into a hook shape, and the soldering portion 42 is positioned outside the outer case 17. On the inside, the outer case 17 gets in the way, making soldering work impossible.

After completing this soldering, the display unit 3 and the control board 6 are set in the board case 7, and as shown in FIG. The substrate 6 is buried. This burying will be explained in detail using FIGS. 3, 4, and 9.

A fitting hole 44 for the display section 3 is provided in the board case 7. Most of the fitting hole 44 is open. A stepped portion 45 is formed around the fitting hole 44 . Four support ribs 46 are formed at the inner corners of the board case 7 in the longitudinal direction.

Since the backing 47 is previously fitted into the stepped portion 45 of the fitting hole 44, the display unit 3 is fitted with this backing 47.
It will be supported by The backing 47 uses urethane foam. A closed-cell elastic synthetic resin, rubber, or the like may be used. Outer case 17 of display section 3
Since the flange portion 48 is provided on the outer periphery of the backing 47, the backing 47 is held between the stepped portion 45 and the flange portion 48. The outer case 17 has a size such that the outer periphery thereof fits into the opening of the fitting hole 44.

The control board 6 is received by the support ribs 46 of the board case 7, and is set in the board case 7 in a state slightly lifted from the bottom surface of the board case 7.

Further, a projection 49 is provided on the upper edge of the outer case ↓7 of the display section 3. This protrusion 49 maintains a gap between the upper edge of the outer case 17 and the control board 6. Board case 7
When the control board 6 is set inside, no unreasonable pushing and bending force is applied to the connection pins 21. This prevents the problem of the connecting pins 21 buckling and causing adjacent connecting pins 21 to come into contact with each other.

The potted synthetic resin layer 43 fills the gap between the outer case 17 and the control board 6 and the upper surface of the control board 6, and fills the display portion 3. This enhances the moisture-proofing effect of the control board 6. The projecting portion 50 of the board case 7 is a potted urethane resin reservoir, from which the urethane resin is injected and poured throughout. The backing 47 prevents the urethane resin from flowing out.

Next, regarding the backlight 16 (EL), FIGS.
This will be explained in detail based on the figures.

Backlight 16 is electro, luminance (EL)
Luminous plate 51. It is composed of a transparent electrode plate 522 and a reflective electrode plate 53. A silver electrode 54 is provided at the edge of the transparent electrode plate 52. The portion other than the electrode 54 is transparent.

A terminal 55 is provided on the electrode 54. Reflective electrode plate 5
3 is made of aluminum, and a terminal 57 is provided via a connecting plate 56.

The light emitting plate 51 is held between a transparent electrode plate 52 and a reflective electrode plate 53. They are connected with adhesive to form a three-part unit.

This backlight] 6 has its transparent electrode plate 52 side joined to the liquid crystal display plate 15. The light from the light emitting plate 51 is transmitted to the transparent electrode plate 5.
2 has the effect of helping to brighten the display on the liquid crystal display panel 15.

The light-emitting Fi51 using EL is sensitive to moisture and soon stops emitting light. This results in black dots due to poor light emission. By covering the Vantarai I to 16 with a synthetic resin film 19 and maintaining a seal with the outside air, the luminous plate 51 is prevented from being exposed to moisture.
This can prevent the deterioration of the luminescent function of the

Note that the terminals 55.57 are provided with small holes 58.59. The connection pins 21 are inserted into the small holes 58 and 59, respectively, and connection with the control board 6 is made as described above. Two connecting pins 21 inserted into the small holes 58 and 59 are provided on the liquid crystal display panel 15. These two connection pins 21 are separated from the electric circuit of the liquid crystal display board 15. This is separately provided for electrical connection of the backlight 16.

The backlight 16 shown in FIGS. 10 and 11 is designed to further improve moisture resistance.

The backlight 16 is sealed with a waterproof package film 60. The package film 60 uses a linear resin such as Teflon.

The backlight 16 is double coated with a protective package film 60 and a synthetic resin film 19, further improving the moisture-proofing effect.

Banking 61 and adhesive 62 are shown in FIG. This is done to improve the bonding seat 7 between the backlight 16 and the liquid crystal display panel 15. 10th
As shown in the figure, the periphery of the lower surface of the backlight 16 is stepped. Banking 61 to eliminate this step
was attached, and an adhesive 62 was applied to the lower surface of the backing 61 to ensure good bonding with the liquid crystal display panel 15. The backing 6e is preferably made of a resilient closed-cell foam material such as urethane foam.

In the embodiment shown in FIG. 12, the connection pin 21 is replaced with an FPC.
63 was used. Connector 6 at the tip of FPC
4 is provided, and this connector 64 is connected to the fixed connector 65 of the control board 6. Of course, the control board 6 is set in the board case 7 and subjected to a potting process to make it moisture-proof.

In the embodiment shown in FIG. 13, the shape of the outer case 17 is changed. Using this outer case F, inner case 18
can be omitted. That is, the outer case 17 is provided with a partition wall 66. A flow passage hole 67 is provided in the lower part of the partition wall 66. The partition wall is attached by being inserted into an insertion portion 68 of the outer case 17. The reason why the partition wall 66 is made separate from the outer case ↓7 is for convenience in molding. Channel hole 67
Therefore, integrally forming the outer case 17 and the partition wall 66 requires the use of a complicated mold structure, and to avoid this, they are made into separate structures. The display section 3 is formed in the following manner. First, the liquid crystal plate 15 is fitted into the outer case 17, and a transparent liquid synthetic resin material is poured into the injection groove 69 at the front of the outer case 17. The synthetic resin material flows through the flow passage hole 67 into the space between the lower surface of the liquid crystal display panel 15 and the outer case 17. The space is filled with synthetic resin while pushing out the air in the space, and further rises upward from the rear side to fill the upper surface of the liquid crystal display panel 15 with the synthetic resin as well.

The liquid crystal display panel 15 is entirely covered with a transparent synthetic resin film to maintain a seal with the outside air. Moreover, since the synthetic resin is filled while pushing out the air in the space, no air is mixed in the synthetic resin film. This can prevent air bubbles from being generated due to mixed air flow without using the inner case 18. Although it does not have a backlight,
A backlight may also be provided.

The explanation so far has been about a case in which a display drive circuit for driving the display of the liquid crystal display board 15 is collectively provided on the control board 6. The display drive circuit of the liquid crystal display board 15 is
It is also possible to separate it from the control board 6 and cover it with a synthetic resin film together with the display drive circuit in the display section 3. With this configuration, the means for connecting the connection pins of the liquid crystal display board 15 and the display drive circuit can be greatly simplified. That is, a display drive circuit (IC) can be connected to each terminal corresponding to a connection pin via printed wiring without using long connection pins. Furthermore, since the connecting portion is simplified and small, the display driving circuit can be molded together with the synthetic resin film surrounding the liquid crystal display panel 15, and the moisture-proofing of the connecting portion is improved. The connection between the display drive circuit and the control board 6 is 2.
It becomes one or several lead wires, making arrangement and connection between the display section 3 side and the control board 6 easier. In addition, the load current of the liquid crystal display board 15 is extremely small, and the display drive circuit (IC)
) generates almost no heat, so there is no problem in molding them together.

Broadly speaking, liquid crystal is an organic optical material.

Liquid crystals are similar to semi-solids. There are solid materials that can be used as organic optical materials. Liquid crystals refer to organic optical materials including semi-solids, solids, etc.

FIG. 4 shows the specific structure of the liquid crystal display board 15.

Upper glass substrate 69. Lower glass substrate 70. Transparent electrodes 71.7 are provided on the inner facing surfaces of both glass substrates 69.70, respectively.
2, a liquid crystal material 73 is placed between both transparent electrodes 71 and 72, and sealed within both glass substrates 69 and 70 to constitute a liquid crystal display panel 15.

The liquid crystal substance 73 is sealed with double-sided adhesive tape (not shown) or the like. The double-sided adhesive tape is arranged so as to surround the outer periphery of the inner facing surfaces of both glass substrates 69 and 70.

Both glass substrates 69 and 70 may be made of hard transparent synthetic resin. Since the transparent electrode 71 is a common electrode, it is a single electrode plate. The transparent electrode 72 is formed by collecting microelectrodes. Thin film transistor 74 on each microelectrode
(TPT) are provided respectively. Electricity is supplied to the microelectrodes via leads 75 and 76 of the signal electrode and the scan electrode. Only one common electrode lead is required. Transparent electrode 71
A color filter 77 is interposed between the upper glass substrate 69 and the upper glass substrate 69 .

Polarizing plates 78 and 79 are provided on the outer surfaces of both glass substrates 69 and 70, that is, on the sides opposite to the transparent electrodes 71 and 72. A backlight (not shown) is provided on the back surface of the polarizing plate 79. Arrow 80 indicates the light of the backlight.

Those that use a backlight are called transmissive types.

A type in which a reflective plate is provided on the back side of the polarizing plate 79 without using a backlight is called a reflective type. One polarizing plate may be used. The reflective plate is attached to the glass substrate 70 without intervening the polarizing plate 79.
It can also be attached directly to the

The liquid crystal display panel 15 having such a structure is coated with a transparent synthetic resin to create a highly moisture-proof display section.

I mentioned earlier that polarizing plates are sensitive to moisture. Liquid crystal materials are also sensitive to heat. This will be explained.

A liquid crystal material is placed between two glass substrates. In order to prevent the liquid crystal material from leaking out, an epoxy adhesive is used around the mating surfaces of both glass substrates to seal the liquid crystal material within both glass substrates.

Moisture (moisture) slowly enters the liquid crystal material through the adhesive. Liquid crystal materials have dielectric properties. When moisture enters, the 5♂ electrical conductivity changes, and the liquid crystal material no longer operates normally even when an electric field is applied. Therefore, it is necessary to coat the liquid crystal display panel with synthetic resin or the like to make it moisture-proof.

Additionally, liquid crystal materials are sensitive to ultraviolet light. In order to prevent ultraviolet rays from entering, a substance that absorbs ultraviolet rays is added to the polarizing plate so that the liquid crystal material is not affected by the ultraviolet rays.

The functions and effects of the embodiments of the present invention described above will be summarized.

1. Providing the liquid crystal display section on the lower left side of the top surface of the washing machine makes it difficult to remove water when putting in and taking out wet laundry with your right hand, and protects the liquid crystal display section, which is sensitive to moisture.

2. By installing the liquid crystal display on the back of the panel lid at the front of the top of the washing machine, when the panel lid is open, it stands vertically and can be clearly seen, and when it is closed, the liquid crystal display is on the back of the panel lid. This prevents water from coming into contact with it directly.

3. By placing the liquid crystal in a transparent case (outer case) and sealing it with transparent casting resin, the liquid crystal, which is sensitive to water and humidity, can be completely sealed, and the display contents can be seen clearly by using transparent material. Can be done.

4. By providing a casting frame (inner case) on the side opposite to the display surface of the liquid crystal, it is possible to circulate the casting resin in one direction, and the air inside is sequentially expelled and filled with the casting resin. Therefore, no air bubbles are generated, and it is possible to prevent poor appearance due to air bubbles or deterioration due to moisture contained in air bubbles.

5. Providing the opening of the casting frame (inner case) in an elongated direction relative to the casting case (outer case) allows the casting resin to circulate more quickly and reduces air entrapment to prevent air bubbles. can be prevented from occurring.

6. By providing a side wall and a bottom surface on the casting frame (inner case), the resin for casting is cast into the container, and can be discharged from the opening at all times without leaking from the side or bottom surface. This can prevent the formation of bubbles.

7. By defining the gap between the liquid crystal display surface and the transparent case (outer case), it is possible to adjust the flow of the casting resin, eliminate air entrapment, and prevent the generation of air bubbles. Can be secured.

8. By specifying the volume of the casting frame (inner case), it is possible to eliminate the need to pour the casting resin twice and only need to perform the casting process twice.
Casting work can be done in a short time.

9. By defining the gap between the liquid crystal and the transparent case (outer case) in the longitudinal and transverse directions, the migration path of the casting resin is made complete, and the liquid overflows.

It is possible to eliminate air entrapment due to drool, etc. and prevent the generation of air bubbles.

10.The liquid crystal and backlighting are sensitive to moisture and water, so by housing the entire thing in a transparent case (outer case) and sealing it with transparent casting resin, it has excellent moisture resistance and the display part is easy to see. It can be a liquid crystal display.

11. Bank lighting (EL) is based on the premise that it is sealed with casting resin, and when used alone, the moisture barrier material, that is, the package film, can be removed, so it is advantageous in price, and it is also easy to use when processing the package film. There are no wrinkles on the surface, making it easy to attach double-sided tape, etc.

12. If the bank lighting (EL) is attached to the liquid crystal and it is sealed with casting resin, the casting resin will penetrate between the liquid crystal and the bank lighting, causing bleeding on the light emitting surface and resulting in poor appearance. Therefore, pasting with transparent double-sided tape prevents penetration of the casting resin and eliminates appearance defects due to stains, etc.

13. By using a foam frame with double-sided tape to connect the liquid crystal and bank lighting (EL), the surface of the bank lighting, which is difficult to flatten, and the liquid crystal are completely bonded around the periphery, and the light emitting surface of the casting resin Prevents penetration and eliminates appearance defects such as stains caused by penetration of casting resin.

14. Liquid crystal and back lighting (EL) are often used back to back, but the rated voltage and frequency are different, making it impossible to use the same power source. By providing empty pins (pins that are not connected to the circuit) on the LCD and electrically connecting these empty pins to the control board via the EL terminals, there is no need for dedicated cables or connection terminals, and direct soldering is possible. You can also obtain connection reliability with .

15. Connection reliability can be achieved by using the terminals of the liquid crystal and directly attaching them to the pattern of the control board with solder, etc.
The entire control board including the liquid crystal can be made compact.

16. By placing the entire control board made of liquid crystal material in a board case and sealing it with transparent casting resin, a control board with liquid crystal that has excellent moisture resistance and allows the display contents to be clearly seen can be obtained.

17. By directly attaching the liquid crystal display sealed with transparent casting resin to the pattern of the control board, storing the whole in a board case, and doubly sealing the liquid crystal part with casting resin. , ensuring moisture resistance of the liquid crystal part, limiting the amount of transparent casting resin used, and obtaining cost benefits.

18. By inserting and fitting the mating pins on the transparent case and the mating holes on the control board side, you can ensure the alignment between the LCD connection pins and the pattern on the control board, making it easy to do so without having to hold down the LCD part with your hands. Direct soldering work is possible.

19. By using cables (FPC etc.) and connectors for electrical connection between the liquid crystal and the control board, the liquid crystal display section can be moved to any location and the display area can be expanded. Furthermore, since it can be attached to and detached from the control board, it has excellent serviceability.

20. The liquid crystal display can display a wide variety of information, and it is important to display this information in an easy-to-understand manner in relation to the washing machine's functions and button operations. By arranging the sensor detection display and progress display at the top, the fully automatic course at the bottom left, the timer display at the bottom right, and the water level display at the bottom center, a washing machine that is easy to see and easy to use can be obtained.

21. Divide the transparent case (outer case) for casting into two parts with a partition plate having an opening at the bottom, store the liquid crystal in one side, and pour the resin for casting into the other. The liquid flows out in one direction, enveloping and sealing the liquid crystal, which prevents the liquid from becoming turbulent and entraining air, and eliminates appearance defects due to air bubbles.

22. By pasting the liquid crystal display section and the transparent case (outer case) with transparent double-sided tape, the intrusion of the casting resin is prevented, and appearance defects such as bubbles and stains are prevented.

〔Effect of the invention〕

As described above, according to the present invention, the surface of a liquid crystal display panel is coated with a moisture-proof transparent synthetic resin.

As a result, moisture is prevented by the synthetic resin, and the liquid crystal display panel does not become damp, so that liquid crystal display defects do not occur.

[Brief explanation of drawings]

The drawings illustrate embodiments of the invention. Fig. 1 is an external view of a fully automatic washing machine, Fig. 2 is an external view of a fully automatic washing machine whose panel part is different from that in Fig. 1, and Fig. 3 is an external view of a fully automatic washing machine with a panel section different from that in Fig. 1. 4th exploded perspective view
The figure is a cross-sectional view of the control board 9 display section taken in the short direction, and FIG. 5 is a perspective view of the display unit as viewed from the display surface side.
Figure 6 is an exploded perspective view of the display unit, Figure 7 is an exploded perspective view of the backlight, Figure 8 is a cross-sectional view of the display unit in the short direction,
Fig. 9 is an enlarged cross-sectional view of the electrical connection between the display unit and the control board, Fig. 10 is a cross-sectional view of a backlight according to another embodiment, and Fig. 11 is a backing of the backlight shown in Fig. 10. FIG. 12 is an exploded perspective view of a display unit and a control board according to another embodiment, with the control board showing only a portion, and FIG. 13 is a display unit according to another embodiment. FIG. 14 is a partially cutaway perspective view of the liquid crystal display panel. 3 display section, 5 liquid crystal display board, outer case, 9 - transparent synthetic resin film. steaming 4I2] 8th flash 8 closing g 靜q fig. 11 1 oimo 13 orchid 6 fig. 11

Claims (1)

[Claims] 1. An upper glass substrate and a lower glass substrate are provided to face each other, transparent electrodes are provided on the inner opposing surfaces of both glass substrates, and a liquid crystal substance is placed between both transparent electrodes to form a liquid crystal material. The liquid crystal display panel is sealed in a glass substrate and has connection terminal pins on the edge of the glass substrate that connect both transparent electrodes to the outside.The outer case is made of transparent hard synthetic resin. The liquid crystal display board is stored in the outer case with the display surface facing the inner bottom of the case, and a backlight made of EL light emitting material is placed on the back of the liquid crystal display board, and the liquid crystal display board is connected to both transparent electrodes. 1. A liquid crystal display device characterized in that a connection terminal pin for a backlight is provided, and the backlight is energized by being connected to an external circuit through the connection terminal pin for the backlight. 2. The product described in claim 2 is provided with a control board for controlling the drive of various loads, a connection part is provided on the control board, and the connection part and the connection terminal pin are connected by directly contacting each other. A liquid crystal display device featuring: 3. The product described in claim 2, which includes a board case, houses the liquid crystal display board and the control board in the board case, and pours synthetic resin into the board case to combine the liquid crystal display board and the control board together. A liquid crystal display device characterized by being molded. 4. A liquid crystal display device according to claim 3, characterized in that urethane is used as the synthetic resin poured into the substrate case. 5. The outer case is made of transparent hard synthetic resin, the liquid crystal display board is housed in this outer case, the transparent synthetic resin is poured into the outer case to cover the liquid crystal display board, and various loads are driven and controlled. A control board is provided, a support pin is provided in the outer case, a support pin engagement hole is formed in the control board to which the support pin engages, and the support pin is inserted and engaged into the support pin engagement hole to attach the LCD to the control board. A liquid crystal display device characterized by having a display board attached. 6. The liquid crystal display board is equipped with an FPC for external wiring, the outer case that houses the liquid crystal display board is made of transparent synthetic resin, and the control board that drives and controls various loads is equipped with a A fixed connector is provided to connect the provided connectors, and the control board is housed in a board case and made of synthetic resin injected into the board case, and the liquid crystal display board is separately made of transparent synthetic resin injected into the outer case. A liquid crystal display device characterized by being sealed.