Presentation display apparatus for displaying two different images on separate displays for a listener and a speaker

A presentation display apparatus including a data storage section for storing a plurality of explanative image data each having (R), (G) and (B) color image components, a data processing section for adding, to the explanative image data from the data storage section, function select image data different in color component from the explanative image data, an image memory for storing the image data of one screen image output from the data processing section, a listener's first display device for displaying the image data which is delivered from image memory and a speaker's second display device. The image data output from the image memory is supplied through a first color converter to the listener's display device and through a second color converter to the speaker's display device. In the first color converter, the explanative image data is alone directly delivered as conversion image data in spite of function select menu image data, so that only the explanative (R)/(G)/(B) image is displayed on the listener's display device. In the second converter, the (R)/(G)/(B) input data are directly output as conversion image data when the function select image data is "0" and otherwise converted to all "1" when the function select menu image is "1" so that the function select menu and (R)/(G)/(B) explanative image are overlappingly displayed on the second display device.

BACKGROUND OF THE INVENTION 
This invention relates to a presentation display apparatus utilizing 
computers. 
In various presentations made in lectures, classroom or other analogous 
situations, speakers explain their topic or subject matter before the 
audience, often relying upon the audio-visual aids such as graphs and 
diagrams, so as to improve the audience's understanding. It is, therefore, 
possible for the speakers to effectively provide more interesting 
presentation before the audience, while relying upon such audio-visual 
aids. 
Heretofore, a slide projector, overhead projector and the like have been 
employed as display devices for assisting the speaker to deliver a speech. 
These devices are initially prepared by the speaker so that characters 
and/or images are projected on the screen through these display devices. 
However, a longer film preparation time, poorer operability in a "frame" 
feed time during presentation and higher cost, for example, are involved, 
inflicting a greater burden on the speaker. 
In recent years, attempts have been made for the speakers to prepare 
explanative diagrams and graphs with an aid of computers in place of the 
aforementioned display devices and to project them onto, for example, a 
display screen. In this case, screen editors, for example, of a computer 
are utilized in the preparation of a screen image as distinct from the 
conventional film image preparation. During presentation, the screen image 
is explained with the use of a pointing device, such as a mouse, digitizer 
or joystick, because the cursor can be freely moved to a proper location 
within the image screen. 
In the computer-assisted display device, in order to switch the screen 
image now explained to the next screen image, a function select menu 
representing "next page", "preceding page", etc. is displayed on the image 
screen and, through the movement of the cursor across the image screen, 
the menu item is indicated on the screen in which case that indication is 
made by the operation of, for example, a switch of the mouse, etc. on the 
computer. 
However, the display of such function select menu is not necessary to the 
audience or listeners and, rather, their attention is often distracted 
from the speaker's topic due to the display of unnecessary menu items, 
preventing an understanding of the audience. 
In order to avoid such a situation, separate screens may be prepared one 
for the speaker and one for the audience, but a double preparation time is 
required in this connection. Furthermore, the memory capacity becomes 
double for such separate screen image data to be stored in memory. 
SUMMARY OF THE INVENTION 
An object of this invention is to provide a presentation display apparatus 
which can give a better understanding of a speaker's topic or subject 
matter to an audience, while ensuring a better operability on the display 
apparatus. 
Another object of this invention is to provide a presentation display 
apparatus of a simple arrangement which can prepare mutually different 
listener's image data and speaker's image data from image data of one 
image screen without the necessity of increasing an image memory capacity. 
Still another object of this invention is to provide a presentation display 
apparatus which can prepare listener's image data and speaker's image data 
with a function select menu added to the speaker's image data, by applying 
a mutually different color conversion process to the corresponding screen 
image data stored in an image memory for each color component. 
According to this invention a presentation display apparatus is provided 
which comprises an image memory for storing an image corresponding to one 
image screen, converters for applying first and second conversion 
processes to the image read out of the image memory to obtain first and 
second images, and first and second display devices for displaying the 
first and second images.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
FIG. 1 shows one example of presentation using the presentation display 
apparatus according to a first embodiment of this invention. 
Projection type screen 7 is placed in front of an audience (listeners) AU 
and CRT monitor 9 for speaker's use is placed in back of the audience AU. 
A keyboard, mouse etc. are connected to CRT monitor 9 to, for example, 
move a cursor for indication or to switch a screen image. The speaker 
initially prepares explanative image data, such as an abstract of 
explanation or associated data (diagrams, graphs) so that the speaker can 
switch the data at a proper timing for presentation on a computer-assisted 
display apparatus. Here the aforementioned explanative image data items 
are both displayed on screen 7 for the audience and on monitor 9 for the 
speaker. In addition to this, a function select menu for display contents 
variation (a partial enlargement or a variation of graph formats) and 
switching of the screen image are also displayed only on the screen of 
speaker's CRT monitor 9. The speaker can move the cursor across the menu 
screen and input a proper function select menu item to the computer by 
operating the switch of the mouse in which case the image screen can be 
properly switched in accordance with the progress of explanation. For this 
reason, the menu items essentially unnecessary to the audience are not 
displayed on screen 7, while never reducing any display area for effective 
data, so that the audience's attention is not distracted by the display of 
the unnecessary data. 
FIG. 2 is a block diagram showing one embodiment of this invention. Data 
processor 1 is comprised of, for example, a CPU, I/O controller, main 
memory and so on and adapted to receive explanative image data from data 
storage 2 and coordinate data from coordinate input section 3 and to 
control various associated parts of the apparatus. Data processor 1 
generates function select menu image data to be added to an explanative 
image. 
Data storage 2 serves as a data storing means for storing the explanative 
image data and may be comprised of, for example, a magnetic disc unit, 
floppy disc unit or optical disc unit. The explanative image data is 
initially prepared by the speakers and stored in data storage section 2 in 
which case it may be prepared by an ordinary graphics processing or may be 
input from, for example, an image reader. 
Coordinate input section 3 moves a cursor for speaker's function selection 
across the display screen and delivers the coordinate of a desired menu 
display area to data processor 1 and cursor controller 4 through the 
operation of the speaker's switch. In this connection a pointing device, 
such as a mouse, digitizer, joy stick or keyboard, is employed. 
Image memory 5 stores, as one image unit, the explanative image data from 
data storage 2 and function select menu's image data to be added to the 
aforementioned explanative image data. Image memory 5 stores image data 
for respective color components--four color components: red (R), green 
(G), blue (B) and white (W) in this embodiment. 
Cursor controller 4 displays, on the screen position designated by 
coordinate input section 3, a function select cursor pattern which is 
necessary to the speaker or presenter. 
The image data which is output from image memory 5 is supplied through 
first color converter 6 to first display device 7 for the audience and 
through second color converter 8 to second display device 9 for the 
speaker, noting that these display devices 7 and 9 are color display 
devices responsive to (R), (G) and (B) inputs and that color converters 6 
and 8 convert four-bit image signals, i.e., (R)/(G)/(B)/(W) signals to 
three-bit image signals, i.e., (R)/(G)/(B) image signals. As display 
devices 7 and 9 use may be made of, for example, a CRT display device or a 
projection type display device. In particular, a large-sized projection 
type display device and small-sized CRT display device are preferred as 
audience's display device 7 and speaker's display device 9, respectively. 
FIG. 3 is a block diagram showing the portions of image memory 5, color 
converters 6 and 8 and display devices 7 and 9. Image memory 5 stores 
four-plane color component image data, i.e., (R)/(G)/(B)/(W) color 
component image data. Respective color component image data are of a 
binary data and are input as a four-bit image data per one pixel to color 
converters 6 and 8. Here, the explanative image screen and function select 
menu image screen are represented by the (R)/(G)/(B) color component image 
data and (W) color component image data, respectively. Color converters 6 
and 8 convert the four-bit (16 levels) image data to three-bit data, i.e., 
(R)/(G)/(B) bit data for color conversion and deliver them to display 
devices 7 and 9, respectively. 
These two color converters 6 and 8 perform a different color conversion 
processing. That is, in first converter 6, even if the (W) color component 
data is "0" or "1", (R)/(G)/(B) input data is output as intact conversion 
image data as shown in Table 1. Therefore, a synthesized image 
(explanative image) comprised of the (R)/(G)/(B) color component image 
only is displayed on first display device 7 as shown in FIG. 3, but the 
(W) image data representing the function select menu item is never shown 
on display device 7. 
In second color converter 8, as shown in Table 2, on the other hand, if 
(W)="0", the (R)/(G)/(B) input image data are output as intact color 
conversion image data as in the case of first color converter 6. At 
(W)="1", the (R)/(G)/(B) image data are all converted to "1", that is, the 
corresponding pixel becomes a white pixel, irrespective of the level of 
the input image data. As shown in FIG. 3, the function select menu item, 
in addition to the explanative image, is displayed on second display 
device 9. 
TABLE 1 
______________________________________ 
Input Output 
No. W B G R B G R Color 
______________________________________ 
0 0 0 0 0 0 0 0 black 
1 0 0 0 1 0 0 1 red 
2 0 0 1 0 0 1 0 green 
3 0 0 1 1 0 1 1 yellow 
4 0 1 0 0 1 0 0 blue 
5 0 1 0 1 1 0 1 purple 
6 0 1 1 0 1 1 0 cyan 
7 0 1 1 1 1 1 1 white 
8 1 0 0 0 0 0 0 black 
9 1 0 0 1 0 0 1 red 
10 1 0 1 0 0 1 0 green 
11 1 0 1 1 0 1 1 yellow 
12 1 1 0 0 1 0 0 blue 
13 1 1 0 1 1 0 1 purple 
14 1 1 1 0 1 1 0 cyan 
15 1 1 1 1 1 1 1 white 
______________________________________ 
TABLE 2 
______________________________________ 
Input Output 
No. W B G R B G R Color 
______________________________________ 
0 0 0 0 0 0 0 0 black 
1 0 0 0 1 0 0 1 red 
2 0 0 1 0 0 1 0 green 
3 0 0 1 1 0 1 1 yellow 
4 0 1 0 0 1 0 0 blue 
5 0 1 0 1 1 0 1 purple 
6 0 1 1 0 1 1 0 cyan 
7 0 1 1 1 1 1 1 white 
8 1 0 0 0 1 1 1 white 
9 1 0 0 1 1 1 1 white 
10 1 0 1 0 1 1 1 white 
11 1 0 1 1 1 1 1 white 
12 1 1 0 0 1 1 1 white 
13 1 1 0 1 1 1 1 white 
14 1 1 1 0 1 1 1 white 
15 1 1 1 1 1 1 1 white 
______________________________________ 
Color converters 6 and 8 are comprised of memories in which the outputs as 
shown in respective columns to Tables 1 and 2 are stored in the address 
locations with the input data as the address. It is preferred that the 
memory be of such a rewritable type as to allow their contents to be 
rewritten, as required, under control of data processor 1. According to 
this invention, various forms of display can be made with a high degree of 
freedom by use of this rewrite of memory. The (R) color component image 
representing a "sun" in FIG. 3 may be erased with the output (R) made to 
be "0" and instead "B" made to be "1" at the input (R)="1". The situation 
under which the number of bits in the input image is increased can readily 
be coped with through the replacement of memory contents. 
When the explanative image stored in data storing section 2 is transferred 
to data processor 1, the function select menu of the (W) color component 
as distinct from the other color components is added by data processor 1 
to the explanative image and delivered as such to image memory 5. In this 
way, the respective different images are displayed on the audience's 
display device 7 and speaker's display device 9. 
A cursor pattern generated from cursor controller is superimposed on 
speaker's display device 9 only in which case the cursor pattern is white 
in color. As a result, the audience screen and speaker's screen are 
displayed as shown in FIGS. 4A and 4B, respectively. That is, the 
audience's screen image is created as the explanative image only as shown 
in FIG. 4A, while on the other hand (W) color cursor 40 and function 
select menu items 42 are added, unlike the audience's screen image, on the 
speaker's screen image as shown in FIG. 4B. 
Cursor 40 can be moved at will with the use of coordinate input section 3 
and the coordinate of a position on the image screen as indicated by 
cursor 40 now in display are entered into data processor 1 through the 
depression of a switch (for example, mouse's switch) attached to 
coordinate input section 3, so that one function item can be selected. If 
the speaker moves cursor 40 across the image screen to, for example, the 
marker item "next page" of function select menu 42 and depresses the 
switch of coordinate input section 3, data processor 1 executes "the next 
page display instruction" and reads the next page's explanative data from 
data storage 2 for delivery to image memory 5. If, on the other hand, the 
speaker moves the marker item "preceding page" of function select menu 42 
and depresses the switch of coordinate input section 3, data processor 1 
executes "the preceding page display instruction" and reads the preceding 
page's explanative data for supply to image memory 5. 
Moving cursor 40 in accordance with the respective explanatory contents, 
the speakers explain and, at the completion of the explanation about an 
image corresponding to one page, display another image corresponding to 
the next page while moving cursor 40 so that they may continue their 
speech. 
According to this embodiment, since cursor 40 for function selection and 
function select menu 42 are displayed on speaker's display device 9 alone, 
not on the audience's display device 7, the audiences are not disturbed by 
unnecessary extra display in their attention to the topic now in progress 
to enable the speaker to offer effective presentation before them. In 
comparison with the case where an image memory is connected to the 
respective image screen, image memory capacity is reduced because of using 
only one image memory in controlling a plurality of display image screens. 
This invention is not restricted to the aforementioned embodiment. Although 
the four image plane data items have been explained as being input to 
color converters 6 and 8, more image data planes can be employed to 
increase the number of image screen data items for combination. It is also 
possible to selectively change the portion of the display image, without 
rewriting the contents of the image memories, by changing the conversion 
process of color converters 6 and 8. 
Although, in the aforementioned embodiment, the cursor has been explained 
as being superimposed on the image screen of the speaker's display device, 
it may be displayed through the image memory as in the case of the display 
of the function select menu. That is, it is only necessary that the (W) 
color image with the function select menu and cursor be stored in image 
memory and then displayed on the speaker's display device only. 
As color converters 6 and 8 use may be made of not only electrically 
erasable memories but also, if it is unnecessary to change the conversion 
process, logic gates to obtain the same result. That is, the (R), (G) and 
(B) image data, except for the (W) image data, are connected to first 
color converter 6 so that the (R), (G) and (B) inputs are supplied, as 
they are, to first display device 7. In second color converter 8, the (R), 
(G) and (B) image data are coupled to first input terminals of OR gates 
44, 46 and 48 and the (W) image data is coupled to the second input 
terminals of OR gates 44, 46 and 48. The outputs of OR gates 44, 46 and 48 
are supplied as (R), (G) and (B) signals to second display device 9. 
As the function select menu items, use may be made of menu items of the 
data representation format, such as a graph to be changed to a pie chart, 
bar graph or line graph, as shown in FIG. 6 as well as "preceding page" 
and "next page". That is, the bar graph and line graph as shown in FIG. 6 
can be switched to a pie chart with the cursor put in alignment with the 
function select menu corresponding to that pie chart. 
As set out above, accord1ng to this invention, a mutually different color 
conversion process is performed on each image data, corresponding to one 
image screen, which is stored in the image memory for each color 
component. 
By so doing, the listener's image data and speaker's image data with the 
function select menu added to the listener's image data can be generated 
in a simple configuration without the necessity for increasing the number 
of image memories required. It is, therefore, possible to provide a 
presentation display apparatus which can prepare the listener's image data 
and speaker's image data, in a mutually different fashion, from image data 
of one screen image, while assuring a listener's better operability, to 
enable the audience to gain a deeper understanding of the speaker's topic.