JP3002352B2 - Image display system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display system , and more particularly, to a high-resolution image having a resolution higher than that of a display device.
An image display system that displays an image by inputting an image signal and displaying the entire image in a reduced or partially enlarged manner.
On-time.

[0002]

2. Description of the Related Art A coordinate input device is rarely used in conjunction with a display. A cursor displayed on a display is moved in conjunction with the coordinate input device, and a cursor is moved over an item displayed on the display. By overlapping, the item is designated by a human. The touch display has a transparent touch coordinate input device installed on the surface of the display, and touches the position of an item displayed on the display with a finger to input the coordinates of the position.
Since the item display on the display can be freely changed by software, a flexible input method can be provided.

[0003] In addition, from the viewpoint of being suitable for general users who are unfamiliar with keyboard input, the input device has recently attracted attention along with the mouse, and the personal device is a personal computer. It is used for computers. On the other hand, problems such as the display surface being soiled, particularly a CRT display having a sense of incongruity when touching the surface with a finger, and generating a parallax between the display and the touch surface are also suitable. The tablet can input X and Y coordinate values by pointing on a two-dimensional input surface with a pen called a stylus. The tablet input surface is associated with a part or the whole of the display screen by software, and the user can place a drawing on the tablet surface and input or draw directly on the display screen. The advantage is that the operability is good, and the accuracy and size are variously prepared. Disadvantages are that, unlike a light pen, it is not possible to gaze only at the display surface, and that it occupies a space corresponding to the size of the input surface. The above is described in "C & C Man-Machine Interface" (edited by NEC Corporation, Man-Machine Interface Research Group).

In general, a flat panel display has a panel section composed of a liquid crystal display, a driving section of the panel section, a control section for sending image data to the driving section, and an image memory section for storing image data. And functions according to instructions from the host computer.

[Problems to be solved by the invention]

[0005]

As described above [0006] In the conventional flat panel tablet, when high-resolution images to be displayed on a display device having only less resolution, it can be displayed or Shi part of the screen There was a lack of information. In order to point to a high-resolution CRT image, the user has to specify indirectly using a mouse or a tablet or directly using a touch panel. In addition, there is a problem of accuracy even when directly specifying using a touch panel (individual pixels cannot be specified, and can be specified only in an area). Also, if you try to configure a tablet using high-resolution panels, high-resolution panels are expensive,
There is a problem that the system becomes very expensive.

[0006] The present invention is made in view of such circumstances, the image of the high-resolution have only less resolution
Focusing on displaying on a non- display device, and associating the position information of the display (the coordinate values detected by the tablet) with the position information of the original image, the display device outputs a high-resolution image signal having a resolution higher than the resolution of the display device. It is an object of the present invention to provide an image display system in which an image is displayed by inputting and reducing the entire display or enlarging a part.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a main control for processing data of a high-resolution image.
And a display having a lower resolution than the resolution of the image
And a tablet associated with the screen of the display
And the main control unit, the display and the tablet
Image display system having a sub-control unit disposed between
Wherein the image display system has a reduced display mode,
Panning display mode, enlarged display mode, mixed display mode
Having a plurality of switchable display modes consisting of
The sub control unit switches to one of the plurality of display modes.
Receiving a display switching command from the main control unit,
The high-resolution image is displayed by the command and the data to be displayed.
The image is converted to an image corresponding to the display resolution and
Display on play and output from the tablet
The received display switching command and the received
And converted to coordinate values corresponding to the high-resolution image,
By outputting to the control unit, a solution lower than the resolution of the image is output.
Tablet associated with the screen of the display of the resolution
In the above, a designated position of a high-resolution image is made possible .

[0008]

In a display device, the resolution of the display device is higher than that of the display device.
High Resolution handle image signal (high-resolution image display the pointing) as inputs the high-resolution image signal, or subjected to reduced display by performing an operation on those image signals, by cutting out a part of the screen You can display (window display) or enlarge and display the input high-resolution image signal.
On a display device with a lower resolution than that of the image
Can be displayed and mapped. If a point on the tablet associated with the screen is designated, the point is converted to a position value of the corresponding high-resolution image and the host C
It returns to the PU (Central Processing Unit), and the position of the high-resolution image can be designated on the tablet.

[0009]

Embodiments will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining an embodiment of an image display method according to the present invention. In the drawing, reference numeral 1 denotes a display screen, 2 denotes a circle, 3 denotes a square figure, and 4 denotes a triangle figure. First, a display method for displaying a high-resolution image on a display device having a lower resolution will be described. As shown below, four types of display modes (all processing by hardware) are provided.
Switch the mode as necessary (complement the various display modes with each other) so that it can be used. (A) Reduced display A high-resolution CRT image signal is subjected to an operation (luminance interpolation by interpolation) for each pixel to obtain one-pixel information from the image information of the number of pixels according to the reduction ratio, and compress the image. Do. When this is output to the panel display, the image on the CRT is reduced and displayed on the panel display.

(B) Panicing Display When a high-resolution image is displayed on a lower-resolution panel display, only a part of the image is displayed (in a state in which neither enlargement nor reduction is performed). , Vertical synchronization), the displayed image portion can be shifted. In addition, by shifting the display portion of the image sequentially, the entire region of the high-resolution image can be viewed. (C) Enlarged display The enlarged display is executed by copying and displaying the pixel data of the original image by the number of pixels corresponding to the magnification. (D) Mixed display (loupe display) A window display area is provided in a part of the screen while displaying the whole in a reduced display, and a part of the image is displayed in that part with the same magnification or magnification. This display, for example, while looking at the whole like reading a dictionary using a loupe,
It looks like you see it enlarged as needed. This is realized by displaying the above display methods (a), (b) and (c) in a mixed manner. The position of the window display and the enlargement ratio can be freely set by the user via the host CPU.

By switching and combining these four displays, no inconvenience occurs even when a high-resolution image is displayed on a display device with a lower resolution. Instructions for switching these processes are given by the host CPU using a keyboard or the like.
A display system is provided via the CPU, and all processing is executed by hardware in the display system, thereby performing high-speed processing without imposing a burden on the host CPU. As a result, the user can freely switch the display mode without interrupting the original work, and can handle a high-resolution image.

Next, a method for associating position information on the tablet with position information of a high-resolution image will be described. FIG. 2 is a block diagram of a flat panel tablet system according to the present invention, in which 11 is a host CPU (central processing unit), 12 is a high-resolution display unit, 13 is a display conversion unit,
4 is a panel display, 15 is a tablet, and 16 is a coordinate conversion unit (sub CPU). The sub CPU 16 in the display system always keeps track of the current display state. For example, even when a window is displayed on the tablet, the sub CPU 16 converts the coordinate values on the tablet assuming that the entire high-resolution image is displayed and converts the position information of the tablet 15 in real time according to the display state ( Coordinate conversion), and as the position information of the high-resolution image, the host C
Return to PU11. Since the same coordinate data as the position information of the high-resolution image is returned to the host CPU 11, the data of the high-resolution image is processed based on the coordinate data. As described above, the display system includes the display conversion unit 13 and the coordinate conversion unit 16 and all resolution conversions are internally processed.
The processing of the PU 11 can be performed in exactly the same way as for high-resolution display.

As described above, independently of the host CPU 11, the high-resolution image signal is display-converted and displayed on the panel, and the position information on the panel is inversely converted into the position information of the high-resolution image. Since these are all processed in the display system, the user can freely change the display mode while the host CPU 11 executes the high resolution display application. Even in this case, the operation of the host CPU 11 is not hindered, and the executable applications are not limited (the compatibility is not impaired).

FIG. 3 is a more specific configuration diagram of the flat panel tablet system according to the present invention. In FIG. 3, reference numeral 21 denotes a video RAM (Video Random Access Memory); 22, a display controller;
3 is a host CPU (central processing unit), 24 is a CRT (Ca
thode Ray Tube; 25 is RAM DAC
(D / A converter), 26 is an X-OP (X-direction data compression unit), 27 is a frame memory (Frame Memory), 28 is a Y-OP (Y-direction data compression unit), 29 is a timing signal generation unit ( Timing Gen), 30 is a sub CPU (central processing unit), 31 is a liquid crystal display (LCD; Liquid Crystal)
Display), 32 is a tablet (Tablet).

As a system example, a high-resolution color CRT is used.
And a case where a monochrome LCD is adopted as the panel display. Display controller 22 and video RAM
21 and the RAM D / A converter 25 constitute a CRT 24 high-resolution display system. The display controller 22 writes data to the video RAM 21 in response to a drawing command from the host CPU 23. Then, the display controller 22 reads the data written in the video RAM 21 in accordance with the display timing of the CRT 24, and generates the display data D (i, j). The display data D (i, j) is input to the RAM D / A converter 25, converted into analog signals R, G, B and provided to the CRT 24. In the CRT 24, the R, G, B signals and the synchronizing signals H,
High resolution display is performed using V.

The RAM D / A converter 25 outputs a digital signal P (i, j) together with the analog signals R, G, B. The digital signal P (i, j) is a luminance value if the liquid crystal display is a monochrome panel, and is a digital R, G, B signal if the liquid crystal is a color display. The digital signal P (i,
j) is input to the X-OP 26, subjected to data compression in the horizontal direction according to SEL-X, and Q (i, j) is output.
The Q (i, j) is temporarily stored in the frame memory 27.
The timing signal generator 29 outputs the data Q from the frame memory 27 in accordance with the display timing of the liquid crystal display device 31.
A timing for reading (k, l) and Q (k, l + 1) is generated.

At this time, it should be noted that two lines of data are simultaneously read. The data Q (k, l) and Q (k, l + 1) for two lines are input to the Y-OP 28 and subjected to vertical data compression in accordance with SEL-Y, and the display data R ( k, l). The timing signal generator 29 writes the timing signals CLK-A, CLK-A to the frame memory 27 based on the synchronization signals H, V from the display controller 22.
CLK-B, a read timing signal CLK-C, and a control signal for the frame memory 27 are generated. Further, the synchronization signals HD and VD of the liquid crystal display device 31 are generated according to the display position specified by the sub CPU 30. Horizontal
SEL-X, SEL- instructing data compression in the vertical direction
Y is generated according to the compression area specified by the sub CPU 30.

The display data R (k, l) and the synchronization signals HD, V
Upon receiving D, the liquid crystal display device 31 performs normal liquid crystal display. However, since the data of the high-resolution image has already been compressed into the display data R (k, l) (in the case of reduced display), reduced display is performed on the liquid crystal display screen. Further, since the synchronization signals HD and VD have already been corrected in accordance with the panning display, the panning display is performed on the liquid crystal display screen. The sub CPU 30 decodes a command given by the user via the host CPU 23. Various display modes are switched, and in the case of panning, the horizontal and vertical positions of the image to be displayed are calculated, and parameters for HD and VD are given to the timing signal generator 29. If the display includes a reduced / enlarged display, SEL-
The parameters of X and SEL-Y are calculated and given to the timing signal generator 29. Further, the sub CPU 30 performs coordinate conversion according to the current display mode so that the coordinate values detected from the tablet 32 become the coordinate values of the high-resolution display, and returns the coordinate values to the host CPU 23.

FIG. 4 is a block diagram of a horizontal (X-direction) data compression circuit. In the figure, reference numerals 41a to 41c denote flip-flops (FF), 42 denotes an adder (ADD), and 43 denotes a multiplexer (MUX). It is. In this block, data compression in the horizontal direction for reduced display is performed. Clock CL
The pixel data P (i, j) is latched by the two-stage flip-flops 41a and 41b together with the KA, and P (i-1, j)
And P (i-2, j) with a 1-lock delay and further input to the adder ADD42 to obtain (P (i-1, j) + P (i-2, j)) / 2
Is a value obtained by compressing data of two pixels adjacent in the horizontal direction. (P (i-1,
j), (P (i-1, j) + P (i-2, j)) / 2) are input and SE
Selected by L-X (when SEL-X = 0, P (i-1,
j): When SEL-X = 1, (P (i-1, j) + P (i-2, j))
/ 2) and enters the next-stage flip-flop 41c, which is latched by the clock CLK-B. The clock CLK-B is equal to CLK-A when SEL-X = 0,
When SEL-X = 1, every other clock is thinned out from CLK-A. SEL-X for normal display (magnification 1)
= 0, but SEL-X = 1 for reduced display.

FIG. 5 is a block diagram of a vertical (forward) data compression circuit. In the figure, reference numerals 51a to 51c denote flip-flops (FF), 52 denotes an adder (ADD), and 53 denotes a multiplexer (MUX). It is. In this block, data compression in the vertical direction for reduced display is performed. Clock CL
Two lines of data Q (k, l) and Q (k, l +
1) is received by two flip-flops, and it is added to adder A
In the DD 52, (Q (k-1, l) + Q (k-1, l + 1)) / 2 is created. This (Q (k-1, l) + Q (k-1, l + 1)) / 2 is
This is a value obtained by compressing pixels of two lines adjacent in the vertical direction. Then, Q (k-1, l) and Q (k-1, l + 1) are already X-O
When two adjacent pixel data in the horizontal direction is compressed at P, data of four pixels is a value compressed to one pixel. In the next stage of MUX 53, SE is used as in the case of X-OP.
By LY = 1, SEL-Y =
0 selects Q (k-1, l) and SEL-Y selects (Q (k-1, l)
+ Q (k-1, l + 1)) / 2 is selected. The output is latched by the next-stage flip-flop 51c and output as panel display data.

[0021]

As is apparent from the above description, the present invention has the following effects. That is, the display device can handle a high-resolution image signal higher than the resolution of the display device (display and pointing of a high-resolution image).
In this way, a high-resolution image signal is input, an arithmetic operation is performed on the image signal to perform reduced display, a part of the screen is cut out and displayed (window display), and an enlarged display is performed. solution of to, the image a high-resolution image signal input
It can be displayed and mapped on a display device having a lower resolution than the image resolution. Further, by specifying a point on the tablet, which is correlated to the screen, returns converted to position values of the corresponding high-resolution image on it to the host CPU (central processing unit), position specification of the high-resolution image on the tablet Becomes possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of an image display method according to the present invention.

FIG. 2 is a block diagram of a flat panel tablet system according to the present invention.

FIG. 3 is a more specific configuration diagram of the flat panel tablet system according to the present invention.

FIG. 4 is a configuration diagram of a horizontal data compression circuit in FIG. 3;

FIG. 5 is a configuration diagram of a vertical data compression circuit in FIG. 3;

[Description of Signs] 1 ... Display screen, 2 ... Round circle, 3 ... Square figure, 4 ... Triangle figure, 11 ... Host CPU (central processing unit) 12 ... High resolution display unit, 13 ... Display conversion unit, 14 ... Panel Display, 15 Tablet, 16 Coordinate conversion unit (Sub CP
U).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-54677 (JP, A) JP-A-3-245187 (JP, A) JP-A-2-35513 (JP, A) JP-A 64-64 94419 (JP, A) JP-A-61-283919 (JP, A) JP-A-64-48120 (JP, A) JP-A-4-299724 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 3/14-3/147

Claims (1)

(57) [Claims] 1. Main control for processing data of a high-resolution image
And a display having a lower resolution than the resolution of the image
And a tablet associated with the screen of the display
And the main control unit, the display and the tablet
Image display system having a sub-control unit disposed between
A is, the image display system, the reduced display mode, Panishingu
Display mode, enlarged display mode, mixed display mode
The display device has a plurality of switchable display modes, and the sub control unit switches to one of the plurality of display modes.
Receives a display switching command from the main control
Before the high-resolution image becomes the command and display target.
The image is converted to an image corresponding to the resolution of the display
Display on the display and accepts position information output from the tablet.
Display switching command and the high resolution image
By converting to coordinate values and outputting to the main control unit,
For screens with displays lower than the image resolution
Specify the position of the high-resolution image on the tablet
An image display system, which is enabled.