JPH0342459Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a display device that has a simple structure, a small number of parts, and enables cost reduction.

[Prior art]

In recent years, liquid crystal display devices, in which the molecular arrangement of the liquid crystal is changed by an electric field, have become popular for use in watches because they operate at low voltages, consume very little power, can be designed with any shape of display characters, and can be made thinner. In addition to displays and numeric displays for calculators, they have come to be widely used for displaying received frequencies in electrical equipment such as tuners, count displays, and even driving directions for automobiles. FIG. 1 is a cross-sectional view showing an example of this type of display device, in which 1 is a printed circuit board, 2 is a liquid crystal display device, and 3a and 3b are interposed between the liquid crystal display device 2 and the printed circuit board 1, and these are electrically connected. 4 is a protective cover disposed on the top surface of the printed circuit board to protect the liquid crystal display device 2 and the conductive rubbers 3a and 3b, 5 is a case that covers the protective cover 4, and 6 and 7 are set screws. It is. Although the liquid crystal display device 2 is conventionally well known and its details are not shown in the drawings, an upper electrode and a lower electrode made of a transparent light guide film with a pattern such as a Japanese character are formed on opposing surfaces of an upper substrate and a lower substrate made of glass. At the same time, a nematic liquid crystal is sealed in a twisted orientation in the sealed gap between these two electrodes, and an upper polarizing plate and a lower polarizing plate whose polarization axes are perpendicular to each other are adhered to the outer surfaces of the upper and lower substrates. It consists of Reference numeral 8 denotes a light guide plate that backlights the liquid crystal display device 2 by guiding light from a light source (not shown), and a white sheet 9 with good light reflectivity is provided between the light guide plate 8 and the printed circuit board 1. It is mediated.

However, in the conventional display device having such a configuration, the protective cover 4 is used outside the case 5, which increases the number of parts, and the white sheet 9 also increases the number of parts, which makes manufacturing difficult. The disadvantages were that the cost was high and assembly workability was poor.

[Summary of the idea]

The present invention has been made in view of the above-mentioned points, and includes a display device storage recess in a light guide cover for back lighting that is open on the top surface and one side of the cover and into which a liquid crystal display device is inserted from the side. a locking piece protruding from both edges of the upper opening side of the storage recess for locking the side edge of the liquid crystal display device; and a conductive rubber plate formed on the lower surface and communicating with the display device storage recess from below. The light guide cover has the function of both a light guide plate and a protective cover by providing an extremely simple structure with a storage hole into which the light guide plate is inserted, reducing the number of parts and improving assembly workability. It provides equipment.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

〔Example〕

FIG. 2 is an exploded perspective view of the display device according to the present invention;
3 is a cross-sectional view taken along the line of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line of FIG. 2. Components in the figure that are the same as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. In these figures,
20 is a liquid crystal display device 2 and a pair of conductive rubber 3
This light guide cover 20 houses and protects the liquid crystal display device 2 and backlights the liquid crystal display device 2. The light guide cover 20 is integrally formed of a transparent plastic material such as acrylic, so that the upper surface and It has a display device storage recess 21 open on one side and is fixed to the top surface of the printed circuit board 1 with a set screw 22. Locking pieces 23a and 2 are provided on both sides of the upper opening side of the display device storage recess 21 and engage with the upper surface of the long side end of the liquid crystal display device 2, respectively.
3b are opposed and integrally protruded, and these locking pieces 23a, 23b prevent the liquid crystal display device 2 from coming off upward. In this case, the liquid crystal display device 2 is housed in the display device housing recess 21 through the side opening of the light guide cover 20. On the other hand, storage holes 24a and 24b are provided on the lower surface of the light guide cover 20 corresponding to the conductive rubbers 3a and 3b.
is formed. These storage holes 24a, 24
b communicates with the display device storage recess 21, and is configured such that the conductive rubbers 3a and 3b are inserted from below, respectively. The liquid crystal display device 2 has its long side end portions connected to the locking pieces 23a, 23.
b and the conductive rubbers 3a, 3b, and is electrically connected to the printed circuit board 1 via the conductive rubbers 3a, 3b. A substantially semicircular light introducing portion 27 is integrally provided at the lower end of the side wall 26 opposite to the opening on one side of the light guide cover 20, and a light source is provided at the center of the circumferential surface of the light introducing portion 27. 2
A semicircular recess 29 is formed to house the 8.

The light source 28 is mounted on the surface of the printed circuit board 1, and a white paint layer 30 is provided on the entire surface of the circuit board 1 (excluding the portions in contact with the conductive rubbers 3a and 3b).

The case 5 has set screws 3 on the printed circuit board 1.
1, it covers the light guide cover 20, and a display window 32 corresponding to the liquid crystal display device 2 is formed on the upper surface. In addition, 3
3 and 34 are screw mounting holes.

Thus, according to such a display device, since the light guide cover 20 performs the back illumination function of the liquid crystal display device 2 and the protection function of the liquid crystal display device 2 and the conductive rubbers 3a and 3b, the conventional light guide cover 20 shown in FIG. Unlike the device, there is no need to manufacture the light guide plate and the protective cover separately, and the number of parts can be reduced. In addition, a white paint layer 3 is provided on the surface of the printed circuit board 1.
0, there is no need to interpose a white sheet between the printed circuit board 1 and the light guide cover 20, and the number of parts can also be reduced in this respect. Therefore, it is possible to provide a display device that has a simple structure, is inexpensive, and is easy to assemble.

FIG. 5 is a sectional view showing another embodiment of the present invention. In this embodiment, projecting parts 40a and 40b are integrally provided on both sides of the light guide cover 20, and these projecting parts 40a and 40b are fitted into a fitting recess 41 formed on the inner surface of the lower end opening of the case 5. This embodiment differs from the above embodiment in that a frame-shaped gasket 43 is interposed between the upper surface of the light guide cover 20 and the inner surface of the case 5, and all other configurations are the same.

According to such a configuration, since the light guide cover 20 is positioned and fixed by the case 5, there is no need to fix the cover 20 to the printed circuit board 1 with set screws, and the structure is more efficient than the above embodiment. This has the advantage of facilitating assembly work.

[Effect of idea]

As explained above, in the display device according to this invention, the light guide cover has the function of protecting the liquid crystal display device and the conductive rubber and the function of backlighting the liquid crystal display device, so the number of parts is reduced. Furthermore, if the number of parts is reduced, the mold manufacturing cost is reduced, making it possible to significantly reduce costs and making assembly work easier, so the practical effects are very large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional display device;
FIG. 2 is an exploded perspective view showing an embodiment of the display device according to the present invention, FIG. 3 is a sectional view taken along the line of FIG. 2, FIG. 4 is a sectional view taken along the line of FIG. 2, and FIG. 5 is a sectional view taken along the line of FIG. It is a longitudinal cross-sectional view which shows another Example. 1...Printed circuit board, 2...Liquid crystal display device, 3
a, 3b... Conductive rubber, 5... Case, 20...
Light guide cover, 21...Display device storage recess, 23
a, 23b...Locking piece, 24a, 24b...Storing hole, 28...Light source, 30...White paint layer, 32...
...display window.

Claims (1)

[Scope of utility model registration request] A printed circuit board, a liquid crystal display device disposed above the printed circuit board, a conductive rubber interposed between the liquid crystal display device and the printed circuit board to electrically connect them, and a conductive rubber disposed on the printed circuit board. a light guide cover that covers the peripheral edge of the liquid crystal display device and conductive rubber and guides light from a light source to the liquid crystal display device; and a case that has a display window and covers the light guide cover. , the light guide cover has a display device storage recess that is open on the top surface and one side and into which the liquid crystal display device is inserted through the one side opening; A display device comprising: a locking piece that locks a side edge of the device; and a storage hole formed on a lower surface and communicating with the display device storage recess, into which the conductive rubber is inserted from below.