JPS6172283A - liquid crystal display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a liquid crystal display device.

[Background of the invention]

Conventionally, in small electronic devices such as electronic game machines, a liquid crystal display device is installed in the device case in an inclined shape relative to the operation section of the device case, and external light is irradiated from the back side of the liquid crystal display device and transmitted through the device case. There are some devices that display information such as games.

However, since the back side of such a liquid crystal display device is surrounded by the equipment case, the external light that illuminates the back side of the liquid crystal display device can only be obtained from the window of the equipment case, and the liquid crystal display device A clear display cannot be obtained because the transmitted light is insufficient. That is, when the external light is weak, the contrast decreases, making it difficult to visually recognize the display. This is especially noticeable in color displays.

[Purpose of the invention]

This invention was made against the background of the above circumstances.
It is an object of the present invention to provide a liquid crystal display device that can obtain sufficient external light and transmitted light and can display extremely clear images.

[Key points of the invention]

In order to achieve the above object, this invention provides a pair of polarizing plates on both the front and back sides of a liquid crystal cell, and also provides a light diffusing plate on one of the polarizing plates, so that the light diffusing plate can reflect light. The diffusion layers are spaced apart from each other.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an electronic game machine will be described with reference to the drawings.

1 and 2 show an electronic game machine, with FIG. 1 being a perspective view of the exterior when being carried, and FIG. 2 being a perspective view of the exterior when in use. In the figure, 1 is an operation case, 2 is a display case, and 3 is a reflection case.A display case 2 is rotatably connected to the rear end of the operation case 1. The display case 2 is arranged so that it can be stored inside the reflective case 3, and when the operating case 1 is pulled out toward the front side of the reflective case 3, the display case 2 is moved relative to the operating case 1 as shown in FIG. It is designed to stand on an incline. In this case, the operation case l is provided with an operation section 7 such as key buttons 4, 5, and an operation knob 6, and inside the display case 2, a game or the like is displayed according to the operation of the operation section 7. A display 8 for displaying information is arranged. Further, a diffuse reflection sheet 9 is attached to the reflection case 3 to give reflected light to the back side of the display 8. This diffuse reflection sheet 9 is a silver sheet with small irregularities formed therein so as to diffusely reflect external light.

FIG. 3 is a sectional view of FIG. 2 showing the internal structure of the electronic game machine, and FIG. 5 is an exploded perspective view of the entire electronic game machine.

The operation case 1 consists of an upper operation case 1a and a lower operation case 1b, and a circuit board 10 is provided inside with a support protrusion 1c.
... is supported by... A battery 11 is connected to this circuit board 10, and an LS 112 is attached to the bottom surface. Further, a key button 4 is provided on the top surface of the circuit board 10.
．． 5... and an operation knob 6 are arranged, and the upper portions of the key buttons 4, 5, . . . and the operation knob 6 protrude upward through the opening 1d of the upper operation case 1a. In this case, the key button 4 is a single rubber sheet with a bulge formed therein, and the key buttons 5, . . . are a single rubber sheet with a plurality of bulges formed thereon. A movable contact 13 is formed in each of these bulges. This movable contact 13 contacts and conducts a fixed contact 14 formed on the upper surface of the circuit board 10, and the fixed contact 14
They face each other in a manner that allows them to move toward and away from each other. Further, the operation knob 6 performs switching according to rotational operation, and is rotatably mounted on the circuit board 10.

Note that the bottom surface of the lower operation case 1b, except for the front end,
It is recessed upward, and an engagement protrusion If is provided in this recess 1e.

1g is formed.

Further, the display case 2 attached to the rear end of the operation case 1 includes an upper display case 2a and a lower display case 2b, and a display body 8 is disposed inside thereof. The upper display case 2a is a hollow frame-like member, and the inner wall surface 2
c is inclined so as to press down on the upper part of the periphery of the display body 8, so as to darken the peripheral background of the display body 8. In addition, rotation connecting pins 2d, 2 are provided at both ends of the front side of the upper display case 2a.
d is formed via arms 2e, 2e. The rotation connecting pins 2a, 2a are inserted inside the rear end of the operation case 1, and are rotatably attached to the upper operation case 1a and the lower operation case 1b. Thereby, the upper display case 2a is rotatably attached to the rear end portion of the operation case 1. On the other hand, the lower display case 2b is attached to the lower part of the upper display case 2a, and has a transparent part 2f formed at its bottom that provides light to the display body 8 from the back (lower surface) side, and has both ends on the near side. Guide pins 2gq2g are formed to protrude in any direction. Also,
The display body 8 arranged in the display case 2 displays information such as games in color, and has polarizing plates 16 & 15b arranged on both the front and back sides of the liquid crystal cell 15, and the surface of the polarizing plate 16a on the front side. A transparent protection sheet 17 is provided on the back side, and a color diffuser plate 18 is provided on the back side of the polarizing plate 16b on the back side.
It has a structure in which these are laminated. In this case, the display body 8 has its peripheral R portion sandwiched between the upper display case 2& and the lower display case 2b.
5 is electrically connected to the circuit board 10 inside the operation case 1 by a flexible sheet 19.

Further, the reflective case 3 in which the operating case 1 and the display case 2 are arranged is composed of a bottom plate 3a and rails 3b, 3b fixed to both sides of the bottom plate 3&. Bottom plate 3&
A reflection-diffusion sheet 9 is provided on the upper surface of the display 8 in correspondence with the display 8, and a locking protrusion 30 is formed at the front end. The reflective diffusion sheet 9 diffusely reflects external light and irradiates the reflected light from the back side of the display 8. The locking protrusion 3c detachably engages the engagement protrusions 1r and Ig formed on the lower surface of the lower operation case 1b of the operation case 1.
When the operating case l is stored, the retaining protrusion 1f is locked as shown by the two-dot chain line to prevent the operating case 1 from being pulled out unnecessarily, and the operating case l is locked. When it is pulled out, the engaging protrusion 1g is locked to prevent it from being drawn into the groove. On the other hand, the rails 3b, 3b have a cutout step 21.21 formed in the longitudinal direction at the bottom thereof, and both side edges of the bottom plate 3& are fitted into the cutout step 21.21, and are attached to the bottom plate 3a. . In addition, on the opposing surfaces of the rails 31) and 3t+, respectively,
a protrusion 22 that slidably holds the operating case 1;
Guide groove 2 that guides guide pin 2g of display case 2
3 and a locking pin 24 for locking the display case 2 are integrally formed. That is, the protrusion 22 is connected to the operation case 1.
The lower operation case 1b is slidably sandwiched between the lower operation case 1b and the bottom plate 3a, and is formed on the front side of the rail 3b13b. The guide groove 23 tilts the display case 2 to stand up and lay it down by moving with the guide pin 2g inserted, and the rear side is parallel to the bottom plate 3a and the front side is inclined diagonally upward. Further, the locking pin 24 is formed at the rear end of the rail 3bs3b, and is removably engaged with the groove 2h formed on both side walls of the rear end of the upper display case 2, so that the display case 2 can be expanded. It is designed so that it does not stand up suddenly.

FIG. 4 is a principle diagram showing the relationship between the display body 8 and the reflective diffusion sheet 9. In the display body 8, external light is reflected by the reflective diffusion sheet 9, and this reflected light passes through the color diffusion plate 18 on the back side of the display body 8, and is polarized by the polarizing plate 161) on the back side.
The light passes through the liquid crystal cell 15, is polarized again by the polarizing plate 16& on the front side, and then passes through, thereby displaying color, and is configured as a so-called transmission type display device. In this case, the liquid crystal cell 15 consists of a pair of transparent glass substrates 15&
, 15a, a twisted field effect type nematic liquid crystal (FE-TN) 15b with positive dielectric anisotropy is sealed between the glass substrates 15a, 15a, and transparent electrodes (
Segment electrodes and common T&poles) are formed respectively, and the nematic liquid crystal 15b is arranged so that the liquid crystal layer is arranged layer by layer when no voltage is applied, due to an alignment film whose alignment direction is perpendicular to the inner surface of each glass substrate 15a. The weave is slightly shifted at a substantially right angle between the glass substrates 15a, 15a. Further, the polarizing plates 16a and 15b are arranged on both sides of the liquid crystal cell 15 with their polarization axes in the same direction. Furthermore, color printing 18a... is applied to the surface of the color diffusion plate 18 on the liquid crystal cell 15 side, and the diffusion surface 1 is applied to the opposite surface.
It is 8b. The color printing 18a is for color display, and corresponds to the transparent electrode of the liquid crystal cell 15.
It is formed slightly larger than one electrode (segment electrode). Therefore, when no voltage is applied to the liquid crystal cell 15, the light that has passed through the color diffusion plate 18 becomes direct S polarized light by the polarizing plate 16b adjacent to the color diffusion plate 18, and enters the liquid crystal cell 15. However, when a driving voltage is applied, the arrangement of the liquid crystal layer in the part corresponding to the applied segment electrode is disturbed, so that only this part is incident. The light passes through the polarizing plate 16& and a predetermined color display is made. On the other hand, the reflective diffusion sheet 9 diffusely reflects external light and displays the display on the display 8 because the display on the display 8 cannot take in sufficient external light and the display becomes dark if only the diffuser plate 18 is used.
It is placed apart from the display body 8 in order to provide sufficient light to the display body 8. In this case, when the display body 8 is tilted, the reflective diffusion sheet 9 is
This means that the equipment must be placed in front of the person at a considerable distance from behind, making the equipment larger (Figure 3). For this reason, in the present invention, the reflective case 3 provided with the reflective diffusion sheet 9 is made movable relative to the display 8 to facilitate portability.

Next, the case of assembling the electronic game machine will be explained.

In this case, first, the display body 8 is connected to the circuit board 10 with the lexiple sheet 19, and the circuit board 10 is placed on the support protrusion IC in the lower operation case lb.
The display body 8 is placed inside the lower display case 2b. Note that an LS 112 is attached to the circuit board 10. After that, the upper display case 2& is attached on the lower display case 2b, and the display body 8 is fixed therein. On the other hand, a battery 11 is connected to the circuit board 10, and key buttons 4.
5... and the operation knob 6 are attached, and the upper operation case 1a is attached to the lower operation case 1b from above, and the circuit board 10 and battery 11 are fixed therein, and the opening 1d of the upper operation case 1&... Through this, the upper parts of the key buttons 4, 5... and the operation knob 6 are made to protrude upward. At this time, the rotation connecting pin 2a formed on the upper display case 2&.

2d is disposed within the rear end of the upper operation case 1a, and is rotatably attached to the upper operation case 1a and the lower operation case 1b. This allows display case 2
is rotatably attached to the operation case 1. After this, move the operation case 1 and display case 2 to the reflection case 3.
The rails 3b, 3 are placed on both sides of the bottom plate 3a.
Place b. Then, the protrusions 22 formed on the rails 3b, 3b slidably sandwich both side edges of the lower operation case 1b of the operation case 1 with the bottom plate 3a, and the guide grooves 23 of the rails 31), 3b. Insert the guide pin 2g formed on the lower display case 2b of the display case 2 into. After this, both side edges of the bottom plate 3a are fitted into the notch steps 21.21 of the rail 3b13b, and each rail 3 is fitted to the bottom plate 3a.
Attach bN3b with screws, etc. Then, an electronic game machine as shown in FIGS. 1 and 2 is obtained.

Next, a case will be described in which the electronic game machine as described above is used. In this case, the operation case 1 is pulled out from the reflection case 3 toward the front. Then, the display case 2 stands up in an inclined state as shown in FIGS. 2 and 3. That is, against the engagement between the retaining protrusion 1f formed on the lower surface of the lower operating case lb and the locking protrusion 3C formed on the front end of the reflective case 3, the operating case 1 is moved to the reflective position. When pulled out from the case 3 toward the front, the operation case 1 slides with both side edges of the lower operation teeth 1b being held between the bottom plate 3a of the reflection case 3 and the protrusions 22 of the rails 3b and 3t+. It will be pulled out to the front. At this time, the display case 2 moves together with the operation case 1. That is, in the display case 2, the rotation connecting pins 2d and 24 of the upper display case 2a are connected to the rear end of the operating case 1 via the arms 2e and 213, so when the operating case 1 moves, this Accordingly, the guide pins 2g, 2g of the lower display case 2b move along the guide grooves 23 formed in the rails 31), 3b of the reflective case 3. When the guide pin 2g52g of the lower display nurse 2b moves along the guide groove 23 of each rail 3b, 3b in this way, first,
A locking pin 24 is formed at the rear end of the rail 3bs3b from the groove 2h formed on both side walls of the rear end of the upper display case 2a.
is dismissed from office. After this, when the display case 2 is further pulled out together with the operating case 1, the guide pin 2g moves obliquely upward along the inclined part on the front side of the guide groove 23, so that the display case 2 is removed from the rotation connecting pin 2a. , 2a, and stand up as shown in FIGS. 2 and 3.

Then, when the display case 2 stands up in a predetermined inclined state,
When the locking protrusion 1g formed on the lower operation case 1'b of the operation case 1 is engaged with the locking protrusion 3C formed on the bottom plate 3a of the reflective case 3, and the operation case 1 is pulled out. Since the display case 2 is held, the display case 2 is held upright in an inclined state. In this way, when the display case 2 stands up at an angle with respect to the operation case 1, the display on the display body 8 inside the display case 2 becomes easier to see, and the operability of the operation section 7 of the operation case 1 also improves. Further, since the display body 8 is sufficiently provided with external light reflected by the reflective diffusion sheet 9 provided on the bottom plate 3a of the reflective case 3, clear color display is possible. In this case, the inner wall surface 2C of the upper display case 2a is inclined to darken the peripheral background of the display 8, so that the color display of the display 8 becomes clearer.

Furthermore, when carrying the electronic game machine as described above, the operating case 1 may be pushed into the reflective case 3, contrary to the above. That is, the retaining protrusion 1 of the lower operation case 1b
When the operating case 1 is pushed into the reflective case 3 against the engagement of the locking protrusion 3C of the bottom plate 3a of the reflective case 3, the guide pin 2g of the lower display case 2b is pushed into the rail 3b.
, 3b, the display case 2 is placed inside the reflective case 3, and when the operation case 1 is further pushed into the reflective case 3, the first As shown in the figure, the operation case 1 and the display nurse 2 are housed in a reflection case 3. When the operation case 1 is stored in this manner, the engagement protrusion 1f of the lower operation case 1b is connected to the locking protrusion 3 of the bottom plate 3a of the reflection case 3.
C, the operating case 1 is housed in the reflective case 3 so as not to be pulled out unnecessarily. Furthermore, since the locking pins 24 of the rails 3t) and 3b are inserted into the groove 2h at the rear end of the upper display case 2a, the display case 2 does not stand up unsteadily.

For this reason, the electronic game machine as described above has a compact GJM as a whole, making it convenient to carry, and when in use, the display case 2 stands up with an angle to the operation case 1. The display body 8 of the display case 2 is easy to see, and the operation part 7 of the operation case 1
Improves operability.

However, according to the liquid crystal display device as described above, a pair of polarizing plates 16&, 16 are provided on both the front and back surfaces of the liquid crystal cell 15, respectively.
b are provided so that their polarization axes are perpendicular to each other, and a color diffusion plate 18 is placed on the side of one polarizing plate 16b, and a reflection diffusion sheet 9 is provided at a distance from this color diffusion plate 18. The diffusion sheet 9 can provide sufficient external light to the rear side of the display 8, and the color display by the display 8 can be made extremely clear.

In addition, in the embodiment described above, the color diffusion plate 18 is provided on the display body 8.
Although color display is performed by providing a color diffuser plate 18, it is not necessarily necessary to provide a color diffuser plate 18, and it goes without saying that a normal diffuser plate may be used.

By using a bright white material and providing unevenness on the surface, it can be integrally formed as a reflective diffusion layer on the bottom plate 3a.

Further, although the above-mentioned embodiments have been described with reference to the case where the present invention is applied to an electronic game machine, the present invention is not limited thereto, and can be widely applied to other small electronic devices.

〔Effect of the invention〕

As explained above, according to the liquid crystal display device of the present invention, a pair of polarizing plates are provided on both the front and back surfaces of the liquid crystal cell so that the polarization axes are orthogonal to each other, and a light diffusing plate is provided on one polarizing plate side. Since the reflective diffusion layer is arranged at a distance from the light diffusion plate, sufficient external light and transmitted light can be obtained, and the display can be made extremely clear.

[Brief explanation of drawings]

The figures show an embodiment in which the present invention is applied to an electronic game, where Fig. 1 is a perspective view of its appearance, Fig. 2 is a perspective view of its appearance showing its usage, and Fig. 3 is a sectional view of the second FA. , 4th
The figure is a principle diagram showing the relationship between the display body and the reflection-diffusion sheet, and FIG. 5 is an exploded perspective view of the electronic game machine. 8...Display body, 9...Reflection diffusion sheet, 15...Liquid crystal cell, 15a...Glass substrate, 15b...Liquid crystal material , 16as16b・
...Polarizing plate, 18... Color diffuser plate. Patent applicant: Casio Computer Co., Ltd. Figure 1 Figure 2

Claims (2)

[Claims] (1) A liquid crystal cell in which twisted field-effect liquid crystal with positive dielectric anisotropy is sealed between a pair of transparent electrode substrates, a pair of polarizing plates disposed on both the front and back surfaces of this liquid crystal cell, and A liquid crystal display device comprising: a light diffusion plate disposed facing one side of a polarizing plate; and a reflective diffusion layer disposed apart from the light diffusion plate. (2) The liquid crystal display device according to claim 1, wherein the reflective diffusion layer is arranged to be movable relative to the liquid crystal cell.