JPH037985A - 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] [Industrial application field] The present invention is a destination display at a railway station or inside a train.

The present invention relates to a display device using a liquid crystal display panel for displaying various types of information such as guidance displays.

[Conventional technology and problems]

Conventionally, such display devices are generally formed from liquid crystal display panel modules that are each configured independently, so a non-display part exists between each liquid crystal display panel module, and multiple liquid crystal display panels There were problems in terms of display quality, such as not being able to perform continuous display across the modules, and light from the back illumination light source leaking through gaps between the liquid crystal display panel modules.

In addition, when constructing a double-sided display device, two sets of display devices using liquid crystal display panels, each of which is configured independently on one side, are generally integrated back-to-back. There are drawbacks such as a large number of parts, such as separate control circuits, and a relatively large configuration.

(Object of the Invention) In view of the above points, the present invention prevents the formation of non-display portions on the sides of the liquid crystal display panel module, and also prevents light from leaking from the gaps between the liquid crystal display panel modules. It is an object of the present invention to provide a display device that has a simple and compact structure by improving display quality and by sharing a back illumination light source and drive control circuit for both sides of the liquid crystal display panels.

[Means and actions for solving the problem] The above purpose is to
According to the present invention, there is provided an upright, substantially rectangular liquid crystal cell, a diffusion plate disposed at the rear of the liquid crystal cell, and a diffusion plate extending horizontally from the upper and lower edges of the liquid crystal cell toward the rear. An upper frame and a lower frame 1 that hold the upper frame and a drive circuit for driving the liquid crystal cells mounted on the upper frame or the lower frame, a side frame that connects both side edges of the upper frame and the lower frame, and a side frame of this side frame. A liquid crystal display panel in which liquid crystal display panel modules consisting of a light shielding section formed to project laterally outward from at least one side are arranged horizontally in at least one row is disposed within the case, and is located approximately in the center of the case. A light source for backlighting the liquid crystal display panel is provided, and a drive control circuit for centrally controlling the drive circuits of each liquid crystal display panel module is provided within the case. Preferably, the liquid crystal display panel is , within the case for 2 ms, so that the tips of the upper frame and lower frame of the liquid crystal display panel module constituting one liquid crystal display panel reach near the liquid crystal cell of the liquid crystal display panel module constituting the other liquid crystal display panel. This is achieved by a display device in which the liquid crystal display panels are arranged alternately, and a light source for backlighting both liquid crystal display panels is disposed approximately in the center of the case.

According to this invention, since the liquid crystal display panel module does not have a frame or the like on the outside of the display surface with respect to the side edges of the liquid crystal cell, almost no non-display part is formed between adjacent liquid crystal display panel modules, and Since the gap between adjacent liquid crystal display panel modules is blocked from the back illumination light source by the light blocking portion formed on the side frame of the liquid crystal display panel module, light from the back illumination light source is transmitted to the liquid crystal display panel module. There is no leakage to the outside through the gaps between them, and high display quality can be obtained.

Furthermore, since the liquid crystal display panel is constructed by arranging the liquid crystal display panel modules in at least one row in the horizontal direction, any number of liquid crystal It is possible to configure a liquid crystal display panel by combining display panel modules, and since the liquid crystal display panel modules themselves are formed in a U-shape, by arranging them back to back alternately, the overall depth of the device can be reduced. can be reduced.

Moreover, since the back illumination light source and control circuit of these liquid crystal display panels are used in common, the number of parts is reduced, assembly is simple, and the structure can be made compact.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of a double-sided display device according to the present invention, in which a double-sided display device 10 has a plurality of liquid crystal display panel modules 12 (eight in the illustrated case) facing the front inside a case 11. A first liquid crystal display panel 13 arranged in a row in the horizontal direction is mounted, and further behind the second liquid crystal display panel 13, a plurality of liquid crystal display panels are similarly arranged toward the back of the case 11. Display panel module 1
A second liquid crystal display panel 14, which is constructed by arranging two liquid crystal display panels 2 in a row in the horizontal direction, is attached (see FIG. 2).

As shown in FIGS. 3 and 4, the liquid crystal display panel module 12 has an upright, approximately rectangular shape, and includes, for example, a dot matrix second liquid crystal cell 21 for performing a desired display, and is arranged behind the liquid crystal cell 21. The diffusion plate 22 includes an upper frame 23 and a lower frame 24 that extend horizontally from the upper and lower edges of the liquid crystal cell 21 toward the rear. It is held by a frame 24.

Further, on either or both of the upper frame 23 and the lower frame 24, a drive circuit 25 made of a printed circuit board for driving the liquid crystal cell 21 to display an appropriate display is mounted on a screw as shown in FIG. is installed by. Furthermore, the upper frame 23
The lower frame 24 has both side edges connected to each other by a side frame 26 inside the side edge of the liquid crystal cell 21,
This strengthens the liquid crystal display panel module 12. At least one of the side frames 26 includes a light shielding portion 2 formed to protrude laterally outward from the side frame 26.
6a. Note that, as shown in FIG. 4, the liquid crystal cell 21 and the diffusion plate 22 are each supported by the upper frame 23 (and lower frame 24) via a cushioning material 27.

The first and second liquid crystal display panels 13 and 14 are obtained by connecting the liquid crystal display panel modules 12 configured in this manner in a row in the horizontal direction, and the first liquid crystal display panel 13 has the following structure: For example, one liquid crystal display panel 13 or one
The upper frame 23 of the liquid crystal display panel module 12 constituting 4
and the tip of the lower frame 24 is connected to the other liquid crystal display panel 14 or 1.
They are arranged alternately so as to reach near the liquid crystal cells 21 of the liquid crystal display panel module 12 that constitutes the liquid crystal display panel module 3.

Further, in the space defined between the first and second liquid crystal display panels 13 and 14 at approximately the center of the case 11, the liquid crystal cells 21 of each liquid crystal display panel module 12 are arranged behind the diffuser plate 22. Light R15 for back lighting from
A control circuit 16 is provided at the bottom of the case 11 to appropriately drive the drive circuit 25 of each liquid crystal display panel module 12 to perform display.

The display device according to the present invention is configured as described above,
By appropriately controlling the drive circuit 25 of each liquid crystal display panel module 12 constituting the first and second liquid crystal display panels 13.14 by the control circuit 16, the first and second liquid crystal display panels 13. Desired characters, etc. are displayed on each liquid crystal display panel module 12 constituting the first and second liquid crystal display panels 13.14.
14, various displays such as destination display and guide display of up to 8 characters will be performed, and at this time, the -th liquid crystal display panel 13 and the second liquid crystal display panel 14 may display the same display. It is also possible to perform different displays.

In this case, since the liquid crystal display panel module 12 does not have a frame or the like on the side of the display surface of the liquid crystal cell 21, the first and second liquid crystal display panels 13, 14 have a space between each liquid crystal display panel module 12. (2) Almost no non-display part is formed, and continuous display across multiple liquid crystal display panel modules 12 is possible. The light that is about to leak is removed from the liquid crystal display panel module 12.
As shown in FIG. 5, the light shielding portion 26a formed on the side frame 26 of
6a.

In the embodiments described above, the first and second liquid crystal display panels 13 and 14 are both constructed by arranging the liquid crystal display panel modules 12 in a row in the horizontal direction, and -
The liquid crystal display panel module 1 is formed to display 8 characters in rows, and further includes a plurality of liquid crystal display panel modules 1 arranged in columns.
It is clear that by stacking and concatenating 2 one above the other, several lines of multiple characters can be displayed.

〔Effect of the invention〕

As described above, according to the present invention, there is provided an upright substantially rectangular liquid crystal cell, a diffuser plate disposed at the rear of the liquid crystal cell, and a diffuser plate extending horizontally toward the rear from the upper and lower edges of the liquid crystal cell. an upper frame and a lower frame for holding the diffusion plate, a drive circuit for driving a liquid crystal cell attached to the upper frame or the lower frame, and further connecting both side edges of the upper frame and the lower frame to each other. A liquid crystal display panel module consisting of a side frame and a light shielding part formed to protrude laterally outward from at least one of the side frames is arranged in a case. A light source for backlighting the liquid crystal display panel is provided approximately in the center of the case, and a drive control circuit for centrally controlling the drive circuits of each liquid crystal display panel module is provided within the case. Preferably, two sets of the liquid crystal display panels are placed back to back in the case, and the tips of the upper frame and lower frame of the liquid crystal display panel module forming one liquid crystal display panel are connected to the liquid crystal display panel forming the other liquid crystal display panel. The display device is configured such that the light sources are arranged alternately so as to reach near the liquid crystal cells of the display panel module, and a light source for backlighting both liquid crystal display panels is arranged approximately in the center of the case. Therefore, since the liquid crystal display panel module does not have a frame etc. on the outside of the display surface regarding the side edges of the liquid crystal cell, there is almost no non-display area between it and the adjacent liquid crystal display panel module. Since the gap between the liquid crystal display panel modules is blocked from the back illumination light source by the light shielding part formed on the side frame of the liquid crystal display panel module, the light from the back illumination light source is transmitted to the liquid crystal display panel module. There is no leakage to the outside through the gaps between the two, and high display quality can be obtained.

Furthermore, since the liquid crystal display panel is constructed by arranging the liquid crystal display panel modules in a small number of rows in the horizontal direction, the liquid crystal display panel modules can be connected horizontally or vertically as appropriate to form an arbitrary structure. It is possible to configure a liquid crystal display panel by combining a number of liquid crystal display panel modules.Also, since the liquid crystal display panel modules themselves are formed in a U-shape, by arranging them back to back alternately, It is possible to reduce the overall depth of the device.

Moreover, since the back illumination light source and control circuit of these liquid crystal display panels are used in common, the number of parts can be reduced, assembly can be simplified, and the device can be constructed in a compact size.

Thus, according to the present invention, no non-display portions are formed on the sides of the liquid crystal display panel module, and no light leaks from the gaps between the liquid crystal display panel modules, so display quality is greatly improved. When a double-sided display device is constructed, by sharing the back illumination light source and drive control circuit for the double-sided liquid crystal display panels, the display device can be easily and compactly constructed, and an extremely excellent display device can be provided.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic front view of a double-sided display device according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a liquid crystal display. A perspective view of the panel module, FIG. 4 is an enlarged side view of the connection part between the liquid crystal cell and the diffuser plate of the LCD panel module in FIG. 3, and the upper frame, and FIG. FIG. 10... Display device; 11-... Case; 1: l"
1 liquid crystal display panel module; 13, 14-...-
・Liquid crystal display panel; 15-... light source; 16-...
Control circuit; 21 - Liquid crystal cell: 22 - Diffusion plate; 2
3--Upper frame; 24--Lower frame: 25--Drive circuit 16--Side frame; 26a-Light shielding portion; 27--Buffer material.

Claims (2)

[Claims] (1) An upright liquid crystal cell having a substantially rectangular shape, a diffusion plate disposed at the rear of the liquid crystal cell, and a diffusion plate extending horizontally from the upper and lower edges of the liquid crystal cell toward the rear; An upper frame and a lower frame to be held, a drive circuit for driving a liquid crystal cell attached to the upper frame or the lower frame, and side frames that connect both side edges of the upper frame and the lower frame to each other;
A liquid crystal display panel is disposed within the case, and includes liquid crystal display panel modules arranged in at least one row in the horizontal direction, the liquid crystal display panel having a light shielding section formed to project laterally outward from at least one of the side frames, A light source for backlighting the liquid crystal display panel is disposed approximately in the center of the case, and a drive control circuit for centrally controlling the drive circuits of each liquid crystal display panel module is provided within the case. A display device. (2) A liquid crystal display in which two sets of the liquid crystal display panels are placed back to back in the case, and the ends of the upper frame and lower frame of the liquid crystal display panel module forming one liquid crystal display panel form the other liquid crystal display panel. They are arranged alternately so that they reach near the liquid crystal cell of the panel module.
2. The display device according to claim 1, wherein a light source for backlighting both liquid crystal display panels is disposed approximately in the center of the case.