JPH0535422Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Application Field The present invention relates to a liquid crystal display device, and is particularly suitable for application to a liquid crystal television device.

B. Summary of the invention The present invention is a liquid crystal display device in which an upper cover with a liquid crystal panel that forms an image can be directly viewed against a main body on which a mirror that reflects the image is fixed to the surface. By attaching the device rotatably, it is possible to make it easier for the user to view the video.

C. Prior Art Conventional liquid crystal display devices, such as liquid crystal television devices, are compact so that they can be easily carried anywhere, and have a function that allows users to watch images whenever they want. For example, a configuration as shown in Figs. 7 and 8 has been proposed so as to have
66167).

In FIGS. 7 and 8, a liquid crystal display device 1
consists of a plate-shaped upper cover 2 rotatably attached to a box-shaped display device main body 4 via a hinge part 3;
When a user wants to view an image, he opens the upper cover 2 and displays the image displayed on the liquid crystal panel 5 attached to the inner surface of the upper cover 2 on the display device main body, as shown in FIG. 4 by mirror 6 fixed to the upper surface of 4.
The image is made visible as a reflected image.

In this case, the illumination light for the liquid crystal panel 5 is obtained by taking in external light from a lighting window 7 provided on the outer surface of the upper cover 2, and by transmitting this external light through the liquid crystal panel 5, the liquid crystal panel surface is illuminated. A visible image is formed on 5A.

D. Problems to be solved by the invention In this type of conventional liquid crystal display device 1, when trying to view an image, as shown in FIG.
By regulating the rotation angle of the upper cover 2 with respect to the main body 4 to a predetermined angle θ within 90°, the taken in external light can be efficiently transmitted through the liquid crystal panel 5 (FIG. 8), and thus the mirror 6 can be adjusted as much as possible. It is designed to project bright images.

However, in this case, the upper cover 2 can only be opened at a predetermined angle θ with respect to the main body 4.
Since the position where the above image can be viewed is limited to a narrow range, there is a problem that it is not only practical, but also difficult for a plurality of people to view the image reflected on the mirror 6 together.

This idea was created taking the above points into consideration.
The present invention aims to propose a liquid crystal display device that is easy to handle and can be viewed by multiple people at the same time by greatly expanding the range in which images can be viewed.

E. Means for Solving the Problem In order to solve this problem, the present invention includes an upper cover 2 having a liquid crystal panel 5 on its inner surface, and a mirror 6 that reflects an image fixed to the upper cover 2 so as to face the upper cover 2. In the liquid crystal display device 1 having a display device main body 4, the upper cover 2 reflects an image of the liquid crystal panel 5 against the display device main body 4 by a mirror 6, and the reflected image can be viewed visually. It is mounted on the display device body 4 so as to rotate from K1 to a second operating mode K2 in which the image on the liquid crystal panel 5 can be viewed directly.

F Function Since the upper cover 2 can rotate relative to the display device main body 4 in the range from the first to the second operation mode, it is easy to always visually check the rotational position of the upper cover 2 relative to the display device main body 4. Can be set in direction.

G. Embodiment An embodiment in which a liquid crystal display device according to the present invention is applied to a liquid crystal television device will be described in detail below with reference to the drawings.

In FIGS. 1 and 3, parts corresponding to those in FIGS. 7 to 9 are denoted by the same reference numerals.
0, the upper cover 2 is rotatably attached to the display device main body 4 so that the upper cover 2 can be opened within the range of 0° to 180° with respect to the display device main body 4.

In this embodiment, the hinge portion 10 includes a rotational friction mechanism, so that when the user opens the upper cover 2 to a predetermined rotational position as necessary, the rotational friction mechanism can maintain the rotational position. is being done.

Further, on the back side of the liquid crystal panel 5 provided on the upper cover 2, an electroluminescence (EL) (not shown) is provided as an illumination light source, thereby making it possible to obtain stable and bright illumination. ing. Further, on the surface of the upper cover 2, as shown in FIG. 5, a heat dissipation plate 11 is provided, which is formed by arranging a large number of fins 11A approximately in parallel.
The amount of heat generated from the EL can be effectively radiated from the upper cover 2 to the outside.

The liquid crystal display device 1 rotates the upper cover 2 relative to the main body 4 to a rotation position within a first rotation range K1 consisting of L0 (0°) to L1 (rotation position slightly smaller than 90°). As shown in FIGS. 3 and 4, the upper cover 2 is rotated from L1 (rotated position slightly less than 90 degrees) to L2 with respect to the main body 4.
It can operate in a second operation mode in which it is rotated to a rotation position within a second rotation range K2 of (180°).

In the first operation mode, the image formed on the liquid crystal panel 5 is reflected by the mirror 6,
The user visually observes the reflected image on the mirror 6. In order to make the image reflected on the mirror 6 a normal image, a vertically inverted image is formed on the liquid crystal panel 5.

On the other hand, in the second operation mode, the image formed on the liquid crystal panel 5 is not reflected by the mirror 6, and the user can directly view the image formed on the liquid crystal panel 5.
You can view the video above. Therefore, a normal image is formed on the liquid crystal panel 5.

When selecting the first or second operation mode,
In order to be able to switch the image to be formed on the liquid crystal panel 5 to a vertically inverted image or an orthogonal image,
A drive control circuit 20 having the configuration shown in FIG. 6 is provided for the liquid crystal panel 5. As shown in FIG.

The drive control circuit 20 has a row electrode selection circuit 21 and a column electrode selection circuit 22, and a scanning counter 23 having an up-down counter configuration of the row electrode selection circuit 21.
An up-down control signal S1 is applied to the rotation angle detection switch 24 via the rotation angle detection switch 24.

When the rotation angle detection switch 24 is turned on when the upper cover 2 is in the first rotation range with respect to the main body 4, it applies an up-down control signal S1 of logic "0" level to the counter 23, and thus the counter 23 is turned on. 23 is operated to count down.

In addition, the rotation angle detection switch 24 is connected to the upper cover 2.
When it is in the second rotation range with respect to the main body 4, it is turned off, thereby providing an up-down control signal S1 of logic "1" level to the counter 23, thus causing the counter 23 to perform an up-counting operation.

In contrast, the counter 2 of the column electrode selection circuit 22
5 always performs an up-count operation.

In the above configuration, when the user wants to watch the video outdoors, for example, as shown in FIGS. The rotational position of the upper cover 2 is determined at such an angle that it can be easily viewed and can block external light such as sunlight. At this time, the rotation angle detection switch 24 is turned on, so that the counter 23 of the row electrode selection circuit 21 counts down the clock signal S _V and provides the count output to the drive circuit 27 via the BCD decoder 26. .

In contrast, the counter 2 of the column electrode selection circuit 22
5 counts up the clock signal _SCH ,
The count output is given to the drive circuit 29 via the BCD decoder 28.

In this way, the pixels of the liquid crystal panel 5 are sequentially driven from the lower left corner to the right, so that a vertically inverted image is displayed on the screen.

On the other hand, if a user wants to watch a video together with multiple people indoors,
As shown in the figure, the upper cover 2 is set in the second rotation range so that the image formed on the liquid crystal panel 5 can be viewed directly. At this time, the rotation angle detection switch 24 is turned off, and the counter 23 of the row electrode selection circuit 21 performs an up-count operation, so that the pixels of the liquid crystal panel 5 are sequentially driven to the right starting from the pixel at the upper left corner. As a result, a correct mapping is displayed on the screen.

Incidentally, since the mirror 6 of the main body 4 is not used, the mirror 6 can also be used for another purpose.

Furthermore, when carrying the liquid crystal display device 1, by fitting the upper cover 2 into the main body 4 as shown in FIG. 5, the liquid crystal display device 1 as a whole becomes a size that is just right to be carried in the hand.

According to the above configuration, the upper cover 2 of the liquid crystal display device 1 can be rotated with respect to the main body 4 to the extent that the image on the liquid crystal panel 5 can be viewed directly, so that the image on the liquid crystal panel 5 can always be viewed. It is possible to obtain a liquid crystal display device 1 that can be viewed from a convenient direction and can be viewed by a plurality of people together.

Although the rotation range of the upper cover 2 in the second operation mode is configured to be between a rotation position slightly smaller than 90 degrees and a rotation position of 180 degrees, the present invention is not limited to this. In the case, the upper cover 2
As shown in FIG. 4, it may be configured to rotate to a rotation position L3 in a rotation range K3 where it is folded back to the back side of the main body 4.

In short, the upper cover 2 may be rotated within a range such that the image on the liquid crystal panel 5 on the upper cover 2 can be viewed directly.

Further, in the above-described embodiment, the operating range in the first operating mode and the second operating mode is divided by a rotation position of the upper cover 2 that is slightly smaller than 90 degrees with respect to the main body 4. However, it is not limited to rotational positions where the switching angle is slightly smaller than 90°.
It can be set within a practically convenient range.

H. Effects of the invention As described above, according to the invention, the upper cover of the liquid crystal display device can be rotated with respect to the main body to a rotation range that allows the image on the liquid crystal panel to be viewed directly. The range in which images formed on the panel can be viewed can be further expanded, and a liquid crystal display device that can be viewed by multiple people together can be easily realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the top cover of the liquid crystal display device of the present invention in the first operation mode;
3 is a perspective view showing the upper cover of the liquid crystal display device in the second operation mode, FIG. 4 is a schematic side view thereof, and FIG. 5 is a liquid crystal display. FIG. 6 is a block diagram showing the drive control circuit of the liquid crystal panel; FIGS. 7 and 8 are perspective views showing a conventional liquid crystal display device; FIG. 9 is a perspective view showing the shape of the outer surface of the upper cover of the device; is a schematic side view thereof. 1...Liquid crystal display device, 2...Top cover, 3,
DESCRIPTION OF SYMBOLS 10... Hinge part, 4... Display device main body, 5... Liquid crystal panel, 6... Mirror, 24... Rotation angle detection switch.

Claims (1)

[Claims for Utility Model Registration] An upper cover having a liquid crystal panel on its inner surface;
A display device main body has a mirror fixed thereto for projecting an image so as to face the upper cover, and the upper cover reflects the image of the liquid crystal panel to the display device main body by the mirror to display a reflected image. In the liquid crystal display device mounted on the display device main body so as to be rotatable from a first operation mode in which images on the liquid crystal panel can be viewed directly to a second operation mode in which images on the liquid crystal panel can be viewed directly, a rotation angle detection means for detecting a rotation angle and outputting a detection signal according to a first operation mode and a second operation mode; and a column electrode selection circuit for selectively driving the column electrodes of the liquid crystal panel. , an up-down counter, a decoder that decodes the count value of this up-down counter,
a row electrode selection circuit comprising a drive circuit for selectively driving the row electrodes of the liquid crystal panel based on the output of the decoder; The down counter is counted down to display a vertically inverted image on the liquid crystal panel, and in the second operation mode, the up-down counter is turned up to display a normal image of the image on the liquid crystal panel. A liquid crystal display device characterized by: