JPH0895525A - Liquid crystal display - Google Patents

Abstract

(57) [Abstract] [Purpose] When a liquid crystal display device is used as the display means, the viewing angle characteristics can be easily inverted in response to changes in the installation position or angle, and display with excellent visibility is possible. To [Structure] A video signal 13 sent to a liquid crystal display unit 12 capable of displaying an arbitrary image 10 is displayed on a display screen 11
While the image 10 rotated by 0 degrees can be displayed,
The display screen 11 itself is installed in a state of being rotated 180 degrees.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a liquid crystal display device such as a liquid crystal display panel as an image display means.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device of this type has, due to its physical properties, one of four viewing angles θ1 to θ4 in the X-axis and Y-axis directions orthogonal to each other as shown in FIG. , At least one viewing angle (θ1 in the illustrated example)
I have no choice but to set narrow. In view of the fact that the liquid crystal display panel 16 for a laptop computer, for example, tends to incline the liquid crystal display panel 16 itself as shown in FIG. It is common practice to design the direction viewing angle θ1 to be narrower than the downward viewing angle θ2.

By the way, in a place where a person often stands up and performs various operations, as shown in FIG. 2C, the liquid crystal display panel 16 is vertically fixed to the wall surface 52 and looked into from above. Such a configuration often improves work efficiency.

However, even in such a case, if the liquid crystal display panel 16 having the above-mentioned viewing angle characteristics is used as it is, the visibility of the liquid crystal display panel 16 becomes extremely poor. Therefore, conventionally, as shown in FIG. 2D, a liquid crystal display panel 16 whose viewing angle characteristics are vertically reversed is specially prepared, or as shown in FIG. 2E, the installation position itself of the liquid crystal display panel 16 is changed. Visibility is improved by setting the liquid crystal display panel 16 at a position to be looked up or by setting the installation angle of the liquid crystal display panel 16 obliquely as shown in FIG.

[0005]

However, in any of the above countermeasures, the layout or the display device must be selected in consideration of the viewing angle of the liquid crystal display panel at the design stage of the entire factory. Lack of design flexibility.

The present invention solves all of these inconveniences at once, and the video signal sent to the liquid crystal display panel is 18
A liquid crystal display device capable of displaying images rotated by 0 degrees and by arranging the display panel itself in a state of being rotated by 180 degrees can easily reverse the viewing angle characteristics in response to a change in the installation position. The purpose is to provide.

[0007]

The liquid crystal display device according to the present invention has a liquid crystal display portion 12 capable of displaying an arbitrary image 10 as shown in the basic structure of FIG.
And a video signal generator 14 for sending a video signal 13 corresponding to the image 10 to the liquid crystal display 12.

Further, in the present invention, the above-mentioned video signal generator 14 sends to the liquid crystal display 12 a video signal 13 which can be displayed while the image 10 is rotated 180 degrees as shown in FIG. . On the other hand, as shown in FIG.
2 is arranged so that at least the display screen 11 thereof is rotated by 180 degrees.

It is assumed that the video signal generator 14 develops data corresponding to the display image 10 on a memory and then sequentially reads the stored contents to convert it into a video signal.
It is possible to read the contents stored in the memory in the reverse order of the normal order and convert them into video signals.

Further, the above-mentioned operation of changing the video signal 13 is
It is preferable that a forward / backward arbitrary state is selected by a switching operation of a switch 15 provided at an arbitrary position including the display screen 11 of the liquid crystal display unit 12.

[0011]

With the above-described structure, the liquid crystal display section 12 is attached at a preset position, and the video signal 13 is sent from the video signal generating section 14 to display the image 10 on the display screen 11.
In this state, when it is determined that the liquid crystal display device has poor visibility due to the viewing angle characteristic, the display screen 11 is installed upside down, and
For example, the operation of changing the video signal 13 is performed by operating the switch 15 set on the display screen 11.

Then, the image signal 13 sent from the image signal generator 14 causes the image 10 to be displayed in reverse on the display screen 11 as shown in FIG. 1B, but the display screen 11 itself is inverted. Since they are installed as shown in FIG. 1, both of them are canceled out as shown in FIG. Therefore, while changing the viewing angle characteristics of the liquid crystal display device upside down, the display screen 1
The image 10 facing the normal direction is displayed on the screen 1.

[0013]

As described above, the present invention is capable of displaying the image 10 obtained by rotating the video signal 13 sent to the liquid crystal display section 12 by 180 degrees, while the display screen 11 itself is
By installing in a state of being rotated by 80 degrees, the viewing angle characteristics can be changed in response to changes in the installation position.

Further, once the image data is expanded on the memory and then read out to create the video signal 13, the reversal of the display image 10 changes the writing direction of the data to the memory or the reading direction of the data from the memory. With conventional display devices,
It can be easily implemented with a slight rework of the program. Further, by selecting the normal display and the reverse display of the image 10 by operating the switch 15, it is possible to perform the switching operation immediately corresponding to the change of the installation mode.

[0015]

EXAMPLE A liquid crystal display device according to the present invention will be described below with reference to FIG.
As shown in, the display control is connected to a programmable logic controller (hereinafter referred to as "PLC") specially configured for the target system sequence control, and performs display and control corresponding to various data handled therein. Although an example of implementation in the apparatus is shown, the present invention is not limited to this, and it is needless to say that the present invention can be implemented in substantially the same manner in various display apparatuses using a liquid crystal display device as its display means, including general-purpose personal computers.

The liquid crystal display device 18 according to the present invention is a PL
It is used together with C17 to be incorporated in an operation console or the like of the target system or independently provided and used as a panel for creating, operating and displaying various data for the target system.

In this embodiment, as shown in FIGS. 4 and 5, the mounting panel 19 is detachably mountable to the mounting panel 19 arranged in the vertical direction.
A device body 21 whose rear part is fitted in the mounting hole 20 of
The mounting panel 19 supporting the device body 21 from the back side thereof
And a mounting jig 22 for fixing the main body 21 of the apparatus.

The device main body 21 has a flange 23 with respect to a main body case 25 having a flange 23 and an opening 24 on the front side.
When the main body case 25 is fixed to the mounting panel 19 by surrounding the periphery of the main body case 25 and detachably closing the opening portion 24 by the front panel 26, the front panel 26 can be removed from the inside of the main body case 25 only by removing the front panel 26. The position of the display control unit 27 provided in the above can be changed.

The mounting jig 22 comprises a mounting frame 28 that surrounds the upper and lower surfaces and the back surface of the main body case 25 in a U shape, and screws 29. Therefore, when the screw tip 31 is pressed against the mounting frame 28 and the screw tip 31 is pulled while screwing with the back side of the body case 25, the tip 32 of the mounting frame 28 is pressed against the back side of the mounting panel 19, The position of the device main body 21 with respect to the mounting panel 19 is fixed.

The front panel 2 of the apparatus body 21 described above
6 has a rectangular opening 33 smaller than the opening 24 on the main body case 25 side in its central portion, and exposes a part of the display control section 27 housed inside the main body case 25 through the opening 33. There is.

The display control unit 27 arranges a display 36 composed of an STN type liquid crystal display plate 34 and a backlight 35 so as to close the opening 33 of the front panel 26, and a display screen 11 on the liquid crystal display plate 34. The front surface of is closed by a transparent touch panel 37, and the surface is covered with a protective sheet 38 in a close contact state. The input position of the instruction by pressing on the touch panel 37 is captured and analyzed via the touch panel controller 46 forming a part of the display control circuit 39, and instruction data can be input by manual operation during operation of the entire system. To do.

The basic configuration of the display control circuit 39 is substantially the same as that of a general personal computer, and a CPU 41 and various memories 42, 43, 4 are connected via a bus line 40.
4, 45 or a graphic controller 47 is connected, and the CPU 41 performs a predetermined arithmetic operation according to a system program stored in the memory 42, while I / O
Data can be input from a keyboard 49 that is detachably connected to the O controller 48, and various calculation results appropriately stored in the work memory 45 are images stored in advance in the graphic memory 44. The data is developed on the video RAM 51 by the image processor 50 and the graphic controller 47, and the display corresponding to the contents written in the video RAM 51 is displayed on the display screen 11 of the display 36.

In the present invention, the display control circuit 39 is further provided.
In FIG. 1, the display image 10 on the display screen 11 can be rotated 180 degrees to be displayed as shown in FIG. 1B, while the liquid crystal display plate 34 is rotated together with the touch panel 37 by 180 degrees as shown in FIG. It is configured so that it can be installed.

That is, the liquid crystal display panel 34 and the touch panel 37 are connected to the display control circuit 39 by a lead wire having a margin in advance, whereby the front panel 26 is connected.
It can be pulled out to the outside only by removing it, and the fixing means for the main body case 25 is also formed symmetrically in the vertical direction. Therefore, the body case 2
While the 5 is fixed to the mounting panel 19, only the liquid crystal display panel 34 and the touch panel 37 provided inside can be manually turned upside down from the front side if necessary.

By the way, in the conventional normal image display operation, when the resolution is 480 dots vertically and 640 dots horizontally as shown in FIG. 6A, the upper left corner on the display screen 11 is displayed. If the coordinates of are set to (1,1), the coordinates of the left and right corners are (480,640) (hereinafter,
This coordinate system is called "screen coordinates".

On the other hand, with respect to the image 10 to be displayed on the display screen 11, coordinates are set according to the same positional relationship as that of the display screen 11 and the resolution as shown in FIG. The coordinate system is called "image coordinates").

Therefore, the graphic controller 4
As shown in FIGS. 6A and 7, the display data of the video signal 13 sent from the display 7 to the display 36 is sequentially stored in the video RAM 5 from the position corresponding to (1, 1) of the screen coordinates.
The image data is read from 1, the image data is sent, and when (480, 640) is reached, scanning is performed back to (1, 1), so that display in which the screen coordinates and the image coordinates match is performed.

By the way, in the conventional video RAM 51,
As shown in FIG. 6C, the addresses A1 to AN corresponding to the above display coordinates are changed from (1, 1) to (480,
Up to 640), one or a plurality of data writing areas are preset for each display dot in a one-to-one correspondence. Therefore, the video RA is changed in response to the change of the image content to be displayed.
By changing the data of the corresponding address on M51, the contents of the data change are immediately reflected in the image change on the display screen 11.

According to the present invention, in addition to the above-described image display in the forward direction, it is possible to perform display in which the image coordinates are inverted by 180 degrees while maintaining the screen coordinates as they are.
An image inversion mode capable of displaying in the reverse direction as shown in (b) is provided.

That is, the image inversion mode is set at the same time when various initial settings are made offline, for example, by a manual switching instruction using a menu type selection switch set by software on the screen. The setting is changed.

Here, the reading of the image data from the video RAM 51 by the graphic controller 47 and the display on the display 36 are performed in the same manner as the forward display even in the image inversion mode.

However, when the image processor 50 sets the image inversion mode, the image data is written from the image processor 50 to the address offset from the image coordinates (480, 640). FIG. 8 shows on the video RAM 51.
As shown in (a), the data of the display graphic is written in a state rotated by 180 degrees.

In such a reversed state, the video RAM 51
The image data read in above is read out and displayed on the display screen 11 as in the normal display.
The image is displayed in a state of being rotated by 180 degrees as shown in (b).
At this time, as shown in FIG.
When it is installed on the main body case 25 in a rotated state, the display image 10 on the display screen 11 described above is further 18
The display screen 1 is rotated by 0 degree, and as a result, it is rotated once by an electrical half rotation and a physical half rotation.
The image is displayed on the display 1 in the normal direction.

Instead of reversing the address when writing the image data to the video RAM 51 as described above, the data is read in the reverse direction at the time of reading and the data is scanned and displayed in the same order as usual. It is also possible. Further, instead of processing the video signal 13 in an analog manner, it is also possible to perform digital signal processing. Furthermore, it is also possible to change the video signal suitable for display on the liquid crystal display panel by leaving the conventional video processing circuit as it is and providing an adapter for digitally processing the video signal output from the circuit.

Further, in the above-mentioned embodiment, the display 36 is integrally provided in the main body case 25, and the processing for rotating only the liquid crystal display plate 34 is performed, but the present invention is not limited to this, and the entire display device is inverted. You can also let it. Also,
The display 36 part may be provided separately from the main body side so as to be rotatable.

Further, inversion switching of the screen display is also replaced with the display 3 instead of the manual switching as described above.
It is also possible to automatically detect that the six parts are inverted and automatically switch the image display to the inverted state. Further, the changeover switch 15 is not limited to the case of being configured as a menu selection type switch using software on the display screen 11, and a mechanical switch may be arranged at any place including the display device. Good.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of the present invention,
(A) shows a display state in the forward direction, (b) shows a display state in the reverse direction, and (c) shows a use state in the reverse direction.

FIG. 2 is an explanatory diagram showing a relationship between a viewing angle and a viewing direction of a liquid crystal display plate.

FIG. 3 is a block diagram showing an example in which the present invention is applied to a display control device.

FIG. 4 is an exploded perspective view showing an external shape.

FIG. 5 is a partially cutaway side view showing a mounting state on a mounting panel.

FIG. 6 is an explanatory diagram showing a relationship between a display screen, an image displayed on the display screen, and data developed in a video RAM.

FIG. 7 is a waveform diagram showing an example of an image signal sent to a display.

FIG. 8 is an explanatory diagram showing a display state according to the present invention.

[Explanation of symbols]

 10 image 11 display screen 12 liquid crystal display 13 video signal 14 video signal generator 15 switch 16 liquid crystal display panel 17 PLC 18 liquid crystal display 19 mounting panel 21 device body 22 mounting jig 23 collar 25 body case 26 front panel 27 display Control unit 34 Liquid crystal display board 35 Backlight 36 Display 37 Touch panel 38 Protective sheet 45 Working memory 50 Image processor 51 Video RAM

Claims (3)

[Claims] 1. A display screen (11) for displaying an arbitrary image (10).
A liquid crystal display section (12) capable of displaying on the upper side, and a video signal generation section (14) for sending a video signal (13) corresponding to the image (10) to the liquid crystal display section (12), While the video signal generator (14) sends the video signal (13) which can be displayed on the display screen (11) to the liquid crystal display (12) while the image (10) is rotated 180 degrees, the liquid crystal display Part (12) has at least its display screen (1
A liquid crystal display device characterized in that 1) is arranged rotated by 180 degrees. 2. The video signal generating section (14) expands and stores image data corresponding to a display image (10) on a memory, and then sequentially reads out the stored content and converts it into a video signal. The liquid crystal display device according to claim 1, wherein the writing or reading of the image data on the memory is performed in a reverse order to the normal order. 3. The liquid crystal display device according to claim 1, wherein the change of the video signal (13) is alternatively selected by a switching operation of a switch (15) provided at an arbitrary position.