JPH0462647B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for attaching a protective plate to the display surface of a liquid crystal display device used as a display section of a portable word processor or the like.

(Prior Art) Recently, liquid crystal displays (LCDs) have been widely used as display units for portable word processors and the like. This LCD has a structure in which the liquid crystal is sandwiched between two sheets of glass, so when it is used in a device, the display side is covered with a protective transparent plastic plate. FIGS. 4 and 5 show cross sections of conventional related parts. FIG. 4 shows a method of attaching the plastic protection plate 2 to the device housing 1 from the inside by adhesive bonding or high frequency welding, where 3 is the adhesive surface and 4 is the LCD. FIG. 5 shows a method in which a protrusion 5 provided on the housing of the device is fitted into a hole 6 of a plastic protection plate 2A, and the tip is heated and welded and fixed. In all of the above cases, a plastic protection plate is attached from the inside of the case, and once attached, it is difficult to remove. In addition, the plastic protective plate must be free from scratches and dirt so that the display will not become difficult to see.
During manufacturing, sales, and maintenance, the plastic protective plate becomes scratched or dirty and needs to be replaced or cleaned. However, in the conventional mounting method described above, not only the plastic protection plate but also the housing must be replaced. In addition, when cleaning, there were drawbacks such as the need to disassemble the housing to wipe the inner surface of the plastic protective plate.

(Problems to be Solved by the Invention) As described above, the present invention eliminates the disadvantages that the protection plate cannot be replaced without the casing or that the casing must be dismantled for cleaning, and the protection plate can be easily attached and detached. It is an object of the present invention to provide a method for attaching a display screen protection plate that can be easily and reliably fixed.

[Structure of the invention]

(Means for Solving the Problems) The protection plate related to the present invention has locking protrusions at both longitudinal ends thereof, and is flexible so that both ends have an internal force to curve outward. The attachment part of this protection plate is a recessed part of the case for embedding the protection plate, whose bottom is the display window and the frame-shaped flat part around it, and is engaged with the above-mentioned locking protrusions on both end walls in the longitudinal direction. A locking hole is provided.

(Function) When installing the protection plate, first curve the protection plate in the opposite direction to shorten the overall length by the amount of the locking protrusion, and after it hits the locking hole in the burial recess, release it to restore the full length. The locking protrusion is inserted into the locking hole of the burial recess, and the internal force of the protection plate is restored, and the locking part formed by the locking protrusion and the locking hole is protected by the center part of the protection plate that presses the frame-shaped plane. The plate is stably fixed in the buried recess due to stress when it is in a flat state. still,
Removal can be easily carried out by hooking one's finger on the notch provided at the edge of the center portion of the protective plate or using a hook.

(Embodiment) FIG. 1 is an exploded perspective view showing details of a portion of a liquid crystal display (LCD) to which an embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view taken along line A-A in FIG. , FIG. 3 shows a BB cross section of FIG. 1, and each also shows the LCD which is omitted in FIG. 1. In Figures 1 to 3, 11 is a liquid crystal display (LCD), 11a is a display surface of the LCD, 12 is a plastic display screen protection plate that protects the display surface, and 12a is a display screen provided on the protection plate. Engagement protrusion, 1
Reference numeral 3 denotes a device housing to which a holding plate is attached, 14 a display window that passes through the device housing, and 15 a protection plate 12 that is provided around the display window and has a warped shape when used alone.
16 is a recess formed with the flat part as the bottom surface and into which the protection plate 12 is fitted; 17 is provided on the wall surface in the longitudinal direction of the recess and engages with the engagement protrusion 12a. Locking hole, 18
is a notch used when removing the protection plate 12 from the device housing 13.

Next, the operation of the present invention will be explained. First, equipment housing 1
3 has a display window 14 provided to match the display surface 11a of the liquid crystal display device 11, and the periphery thereof forms a recess into which the protection plate 12 is fitted. The display window 14, which is the bottom surface of this recessed portion, and its surroundings are a frame-shaped flat portion 15. Further, the recess has locking holes 17 at both ends thereof in the longitudinal direction, into which projections 12a at both ends of the protection plate 12 in the longitudinal direction are inserted. On the other hand, when the protective plate 12 is not assembled, as shown in FIG. 1, the central portion is warped so as to be convex toward the device housing (lower side in the figure). Further, the thickness of the protective plate is formed to be slightly thicker than the depth of the recessed portion on the side of the casing.

To attach the protective plate 12 to the recess 16 of the device casing 13, first insert one of the projections 12a into the locking hole 17 of the device casing, lift the center part upward while holding down the opposite end, and then lower the The protective plate, which was convex at the top, is now curved upward. Then, when the protrusion 12a at the opposite end is inserted into the recess and the lifted center part is released, the remaining part of the protrusion 12a is inserted into the locking hole 17 on the housing side. Since the protection plate 12 has a downwardly convex shape in the free state, in the locked state, the frame-like plane 15 and the locking hole 17 apply a force to the protection plate in a direction to return the downward convex warpage. This allows the parts to be assembled without rattling or lifting. It can be easily removed by hooking the tip of a finger on the notch 18 in the center or by lifting it with a hook.

The above has described plastic protective plates used to protect the display surface of liquid crystal display devices (LCDs), but display devices are not limited to LCDs, but include plasma display devices and
It can be used similarly for LEDs. It can also be used to hold down replaceable display nameplates.

〔Effect of the invention〕

The present invention is as described above, and (i) since adhesion and welding are not performed, equipment, materials, and time can be saved. (ii) Installation and removal are extremely easy and productivity is high. (iii) When replacing the protection plate, there is no need to dismantle the equipment casing or replace the casing, which improves manufacturing yield and reduces the cost of maintenance parts; (iv) Because it is easy to install and remove, the inside of the protection plate Cleaning is also easy. Effects such as this can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a portion of a device to which an embodiment of the present invention is applied, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. 4 and 5 are sectional views showing a conventional example in comparison with FIG. 3. 11a: LCD display surface, 12: Protective plate, 12
a: Engagement projection, 13: Housing, 14: Display window, 1
5: Frame-shaped flat part, 16: Recessed part, 17: Locking hole.

Claims (1)

[Claims] 1. A flexible and transparent protective plate which is curved so that its longitudinal central portion is convex toward the display surface side and has an engaging protrusion on the end surface of the curved end, and is provided on the casing so that the liquid crystal display surface can be seen through. a display window; a recess that is provided including the display window and its surrounding area and in which the protection plate is embedded; a frame-shaped flat part that is formed around the display window as a bottom surface of the recess; and the recess. a locking hole provided in the longitudinal wall surface of the side wall and into which the engaging protrusion is inserted; the protective plate is once curved in the opposite direction and fitted into the recess, and the locking hole at both ends and the flat part are inserted. A method for attaching a liquid crystal display screen protection plate, characterized in that the protection plate is stably held on the liquid crystal display surface of a housing by being supported at the center.