JPH036935Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a liquid crystal display device in which a display image on a transmissive liquid crystal display panel is reflected by a reflective member to perform display using the surface of the reflective member as a screen.

[Technical background of the invention and its problems]

2. Description of the Related Art Some liquid crystal display devices, such as liquid crystal television receivers, that use a transmissive liquid crystal display panel perform display by reflecting the displayed image of the liquid crystal display panel with a reflective member, using the surface of the reflective member as a screen.

FIG. 1 shows an outline of a conventionally known liquid crystal display device of this kind, in which a transmissive liquid crystal display panel 3 is provided on a display block 2 whose base end is pivotally supported at one end of the device main body 1. A reflecting member, for example, a reflecting mirror 4 is provided on the upper surface of the apparatus main body 1.

The liquid crystal display device shown in FIG. 1 uses a T.N type (twisted nematic type) type as the transmission type liquid crystal display panel 3. , a liquid crystal is filled between a pair of upper and lower transparent electrode substrates in a twisted orientation of approximately 90 degrees, and a pair of polarizing plates 3a and 3b are stacked on the upper and lower surfaces with their polarization axes substantially perpendicular to each other. There is.

This liquid crystal display device is used by raising the display block 2 at a predetermined angle as shown in the figure. The display image on the transmissive liquid crystal display panel 3 is reflected by a reflecting mirror 4 that faces diagonally to the liquid crystal display panel 3, and a display is performed using this reflecting mirror surface as a screen. . In addition, in this type of liquid crystal display device, the position of the image reflected on the reflective mirror surface changes depending on the viewing angle, and in some cases, a part of the displayed image may come off the reflective mirror surface and the image in this part becomes invisible. Therefore, in this type of liquid crystal display device, the reflecting mirror 4 is made sufficiently larger than the liquid crystal display panel 3 to obtain a wide viewing angle.

By the way, in the above-mentioned liquid crystal display device in which the display image of the liquid crystal display panel 3 is reflected by the reflecting mirror 4 and display is performed using the reflecting mirror surface as a screen,
In addition to the display light from the liquid crystal display panel 3, depending on the position of the light source, outside light may also directly enter the reflection mirror 4 surface from the surroundings.
Since the display light from the display light has passed through the polarizing plates 3a and 3b, it is somewhat dark, whereas the external light that directly enters the reflecting mirror surface is bright light. When the outside light enters the screen, the displayed image becomes thin due to the influence of this outside light.Also, if the outside light is very bright, the screen may become dazzling due to the outside light reflected on the reflective mirror surface, which is why this type of LCD Display devices have had the problem that the screen becomes extremely difficult to see due to the influence of external light.

[Purpose of invention]

This idea was made in view of the above-mentioned circumstances, and its purpose is to provide a transmissive liquid crystal display panel and a reflective member pivotally supported to open and close the transmissive liquid crystal display panel. When displaying, the reflective member is diagonally opposed to the transmissive liquid crystal display panel, and the displayed image on the liquid crystal display panel is reflected by the reflective member, so that the surface of the reflective member serves as a screen. An object of the present invention is to provide a liquid crystal display device which can reduce the influence of external light directly incident on the surface of a reflecting member and make the screen easier to see.

[Summary of the idea]

That is, this liquid crystal display device includes a transmissive liquid crystal display panel and a reflective member pivotably supported on the transmissive liquid crystal display panel so as to be openable and closable. In a liquid crystal display device in which the reflective member is diagonally opposed to the reflective member and the display image of the liquid crystal display panel is reflected by the reflective member so that the reflective member surface serves as a screen, a polarizing plate is integrally provided on the surface of the reflective member. By providing this, the influence of external light that directly enters the reflecting member surface is reduced, making the screen easier to see.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings, taking a liquid crystal display type television receiver as an example.

FIGS. 2 and 3 show the appearance and cross section of a television receiver. In FIGS. 2 and 3, 11 is the main body of the television receiver, 12
is a display block, and the main body 11 and the display block 12 each have a thin box-like outer shape, and the display block 12 has hinge parts provided on both sides of the rear end of the case 14 (hereinafter referred to as the display block case). 15 is pivoted to the rear end of the case 13 (hereinafter referred to as the main body case) of the main body 11 by a support shaft 16, and is opened diagonally at a predetermined angle with respect to the upper surface of the main body as shown in the figure from a position overlapping the upper surface of the main body 11. It is designed to be opened and closed by rotation around the support shaft 16 to the above-mentioned position. Note that the display block 12
is designed to be closed so as to overlap the top surface of the main body 11 when not in use.

Next, to explain the structure of the main body 11, the main body case 14 has a shape in which the front end side (the side opposite to the pivot side of the display block 12) is formed one step higher and this part is used as the operation panel section 11a. The display block 1 of this main body case 13
A flat rectangular reflective member, for example, a surface reflective mirror 21 having a glass surface coated with silver vapor deposition, etc., is adhered to the upper surface of the portion where the two overlap (excluding the operation panel portion 11a). Further, a battery box 22 is formed in the main body case 13 and opens at the bottom thereof, and a required number of batteries 23 are accommodated in the battery box 22. Note that 24 is a lid of the battery box 22.

Further, 25 is a main body side circuit board installed in the main body case 13, and a rod antenna 26 for receiving television radio waves and radio waves is connected to this main body side circuit board 25. This rod antenna 26 is pulled out from the main body case 13 and stretched when in use, and is pulled out from the main body case 13 when not in use.
It is now stored inside. Further, the battery box 2 is located on the lower surface of the main body side circuit board 25.
Avoid position 2, tuner 27 and LSI28, 2
8, an amplification transistor 29, etc. are attached. Further, on the front end of the main body side circuit board 25, that is, the part facing the operation panel part 11a of the main body case 13, there are provided on the upper surface an audio volume dial 30, a tuning dial, and a bright volume for adjusting the image display density. A dial (not shown) is attached. In addition, 31 in the figure is an operation knob of the audio volume dial 30, and 32 is an operation knob of the audio volume dial 30.
and 33 are operating knobs for the tuning dial and bright volume dial. Further, 34 is a horizontally elongated window formed on the upper surface of the operation panel section 11a, and the channel selection pointer 35 that moves in conjunction with the operation of the operation knob 32 of the tuning dial can be seen from this window 34. It's getting old. Furthermore, on the upper surface of the operation panel section 11a,
VHF, UHF and FM along the window part 34,
The display of each AM station is printed, and the slide switch operation knob 36 also serves as a power switch and a television/radio selection switch.
VHF-UHF switching slide switch 37 (3rd
An operating knob 38 (see figure) and an operating knob 39 for an FM-AM switching slide switch are provided.

Further, in FIG. 3, 40 is a speaker consisting of a piezoelectric buzzer, and this speaker 40 is mounted on a speaker mounting part 41 formed by tilting the front end bottom surface of the main body case 13 upward toward the front end side.
The outer periphery of the speaker is fixed around a sound emitting hole 42 formed in the speaker mounting portion 41 with a presser member (not shown). The reason why the speaker mounting portion 44 is inclined in this manner is to emit the sound from the speaker 43 not only downward but also forward, thereby widening the range in which the voice can be heard clearly.

Next, explaining the display block 12, a rectangular opening is formed in the center of the upper and lower surfaces of the display block case 14, and a display panel protective glass 43 is fitted into the opening on the lower surface. . In the display block case 14, a dot matrix display type transmissive liquid crystal display panel 44 is disposed in the center facing the protective glass 43, and also on the front end side of the display block case 14. On the rear end side, a display block side circuit board 45a is arranged side by side with the liquid crystal display panel 44,
45b is arranged.

The liquid crystal display panel 44 is, for example, a T/N type, and a polarizing plate 44a provided on its upper surface (light receiving surface) is adhered to the upper surface of the liquid crystal display panel, and the other polarizing plate 44b is attached to the main body 11. It is attached to the surface of the reflecting mirror 21 on the side thereof.
The polarizing plate 44b provided on this reflecting mirror surface is approximately the same size as the reflecting mirror 21. FIG. 4 schematically shows the positional relationship between the liquid crystal display panel 44, the reflecting mirror 21, and the polarizing plates 44a and 44b. Note that the liquid crystal display panel 44
Even if one of the polarizing plates 44b is provided apart from the liquid crystal display panel 44, the structure of the T/N type liquid crystal display panel basically remains the same. It is possible to perform a display that is completely the same as that of

In addition, the two display block side circuit boards 45
Two display panel drive control LSIs 46 and 46 are attached to a and 45b, respectively.
These two circuit boards 45a, 45b and the terminal arrangement portions on both sides of the liquid crystal display panel 44 are connected by film-like connectors 47a, 47b, respectively. Further, the two circuit boards 45a, 4
One end of a film-like flexible connector 48 for connection to the circuit board 25 on the main body 11 side is connected to the other end of the circuit board 45b on the rear end side of the case among the circuit boards 45b. The block case 14 is pulled out from the opening 49 provided on the lower surface of the rear end, and is drawn into the main body case 13 through the slit formed on the upper surface of the rear end of the main body case 13 and connected to the end of the main body side circuit board 25. It is connected. Note that the circuit board 45a on the front end side of the display block 12 is connected to the circuit board 45a on the main body side through the flexible connector 48.
5b by a cable (not shown), and is connected to the main body side circuit board 25 via this circuit board 45b and the flexible connector 48. Further, a light diffusing and transmitting plate 50 (hereinafter referred to as a diffusing plate) having a roughened lower surface of a transparent plate (for example, glass) is fitted into the opening on the upper surface of the display block case 20.

Further, in FIG. 3, 51 is an electroluminescence illumination panel (hereinafter abbreviated as EL panel) arranged above the liquid crystal display panel 44 in the display block case 14, and this EL panel 51 is a display block. The display block case 14 is slidably supported within the case 20.
A knob portion 51a protruding from the outer surface of the (see Fig. 2)
By the sliding operation, it is slid from above the liquid crystal display panel 44 to the front end of the case and removed from above the liquid crystal display panel 44.
Note that when this EL panel 51 is placed facing the liquid crystal display panel 44, it is connected to the circuit board 45b on the rear end side of the display block through a contact type connector (not shown).

In this embodiment, the circuit boards 45a and 45b for driving the display panel 44 are provided on the display block 12 side, because if the display panel drive circuit is provided on the main body 11 side, the main body 11 and display block 12 will be connected to each other. This is because it is necessary to use a connector with a large number of connection lines as a flexible connector for connecting, and the connection becomes extremely difficult.If the display panel drive circuit is provided on the display block 12 side as described above, The flexible connector 48 only needs to have a small number of lines, and can be easily connected.

This television receiver has display block 1.
2 is used with it opened at a certain angle,
In places where sufficient outside light cannot be obtained, an EL panel 51 is placed opposite the liquid crystal display panel 44 as shown by the solid line in FIG. 3, and images are displayed using the illumination light from this EL panel 51. In a place where light can be obtained, slide the EL panel 51 from the position facing the liquid crystal display panel 44, remove the EL panel 51 from above the liquid crystal display panel 44 as shown by the chain line in FIG. Display is performed using the outside light taken in. In either case, the image displayed by the liquid crystal display panel 44 is projected onto a reflecting mirror 21, which faces diagonally to the liquid crystal display panel 44 and has a polarizing plate 44b on its surface, and reflects the image. Since it is reflected on the surface of the mirror 21 as shown by the chain line in FIG. 2, the display image A can be viewed using the reflective mirror surface on the top surface of the main body 11 as a screen. Note that the liquid crystal display panel 44 may be installed upside down so that the image reflected on the reflective surface becomes a normal image.

However, in this liquid crystal display type television receiver, as mentioned above, the reflecting mirror 21 that becomes the screen is
Since the polarizing plate 44b is provided on the surface, the reflecting mirror 21
Even if external light hits the surface directly from the surroundings, this incident external light will be blocked by the polarizing effect of the polarizing plate 44b on the reflecting mirror 21, excluding vibration waves in one direction. The external light reflected by the surface 21 is the display light of the liquid crystal display panel 44 (the polarizing plate 44a on the top surface of the liquid crystal display panel, the liquid crystal display panel main body, and the reflecting mirror 21).
The brightness is approximately the same as that of the light that has passed through the upper polarizing plate 44b. Therefore, according to this liquid crystal display type television receiver, even if external light is directly incident on the surface of the reflecting mirror 21, it is possible to suppress the fading of the displayed image due to the influence of this external light. Even if the outside light is very bright, the screen will not be dazzled by the outside light reflected on the reflecting mirror 21 surface, so the screen can be brightened by reducing the influence of outside light that is directly incident on the reflecting member surface. It can be made easier to see.

In the above embodiment, the polarizing plate 44b on the lower side of the liquid crystal display panel 44 is provided on the surface of the reflecting mirror 21, but instead, the liquid crystal display panel 44 may have a structure in which polarizing plates are laminated on the upper and lower surfaces of the liquid crystal display panel 44, respectively. , another polarizing plate may be provided on the surface of the reflecting mirror 21 with the polarization axis direction matching that of the lower polarizing plate of the liquid crystal display panel 44. This also applies to the case where, for example, a G/H type (guest/host type) liquid crystal display panel equipped with a polarizing plate for increasing display contrast is used as the liquid crystal display panel. Further, in the above embodiment, the EL panel 51 is provided within the display block 12, but this EL panel 51 is not necessarily required, and the liquid crystal display panel drive circuit may be provided on the main body 11 side. Further, in the above embodiment, a liquid crystal display type television receiver was explained, but it goes without saying that this invention can be widely applied to liquid crystal display devices such as liquid crystal display type game consoles in addition to liquid crystal display type television receivers. be.

[Effect of idea]

According to this invention, a transmissive liquid crystal display panel,
The transmissive liquid crystal display panel is provided with a reflective member pivotally supported to be openable and closable, and when displaying, the reflective member is diagonally opposed to the transmissive liquid crystal display panel, and the liquid crystal display panel Although the display image is reflected by the reflecting member to use the reflecting member surface as a screen, the influence of external light that directly enters the reflecting member surface can be reduced, making the screen easier to see.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional liquid crystal display device in which a display image on a liquid crystal display panel is reflected by the reflecting member to perform display using the reflecting member surface as a screen, and Figs. 2 and 3 are one embodiment of this invention. FIG. 4 is a perspective view and a sectional view of an external appearance of a liquid crystal display type television receiver showing an example, and a schematic view showing the positional relationship between a liquid crystal display panel, a reflecting member, and a polarizing plate. 11...Main body, 12...Display block, 21...
...Reflector, 44...Liquid crystal display panel, 44a, 4
4b...Polarizing plate, 51...Electroluminescent lighting panel.

Claims (1)

[Claims for Utility Model Registration] A transmissive liquid crystal display panel and a reflective member pivotably supported on the transmissive liquid crystal display panel so as to be openable and closable; In a liquid crystal display device in which the reflective member is diagonally opposed to the reflective member and the display image of the liquid crystal display panel is reflected by the reflective member so that the reflective member surface serves as a screen, a polarizing plate is integrally provided on the surface of the reflective member. A liquid crystal display device characterized by: