Computer graphics processing and selective visual display system – Data responsive crt display control
Reexamination Certificate
2000-01-28
2004-01-27
Shalwala, Bipin (Department: 2778)
Computer graphics processing and selective visual display system
Data responsive crt display control
C345S204000
Reexamination Certificate
active
06683585
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a picture display device for displaying an image signal outputted from an image signal generating device, such as a personal computer, a workstation, etc. (hereinafter simply referred to as PC), and to a picture display device control system in which the position, distortion, brightness, picture quality, etc. of the screen can be directly adjusted from the image signal generating device.
2. Description of the Background Art
FIG. 13
is a diagram showing a system in which a PC and a CRT (Cathode Ray Tube) display device are connected through a USB (Universal Serial Bus) to adjust the brightness, contrast, screen position, size, etc. in the CRT display device. The system shown in
FIG. 13
includes a PC
30
containing a USB controller, a CRT display device
35
, an image signal generating means
31
provided on the PC
30
and for generating screens for adjustments etc, the USB controller
32
for outputting screen adjusting information etc., an image signal cable
9
at least carrying an image signal
9
a
and a sync. signal
9
b
in the same cable, and a USB cable
34
provided separately from the image signal cable and having a connector of a different shape, for transferring the screen adjusting information from the USB controller
32
to the CRT display device.
The system further includes an image signal amplifying portion
10
receiving and amplifying the image signal outputted from the PC
30
, an OSD adding circuit
23
for adding a signal for OSD (On-Screen Display) to the image signal, a drive circuit
24
for driving the CRT with the image signal outputted from the OSD adding circuit
23
, a display portion
13
composed of a CRT for displaying the image signal coming from the drive circuit
24
, a USB function
33
receiving the screen adjusting signal from the USB controller
32
, for extracting the adjusting information and sending the information to an MPU
17
described later, the MPU (microcomputer)
17
for interpreting the adjusting information from the USB function
33
and controlling various adjustment and correction circuits in accordance with the contents, as well as setting operation modes in various parts of the CRT display device, and a screen adjusting portion
19
for making adjustments in various parts on the basis of the adjusting information from the MPU
17
.
Next its operation will be described. Dedicated software is operated on the PC
30
to generate a screen for adjustments like that shown in
FIG. 14
in the image signal generating means
31
, which is displayed on the CRT display device
35
. The user selects items to be adjusted on the adjustment screen and operates to make adjustments while looking at the screen. The operated items and adjusting data are outputted to the USB cable
34
via the USB controller
32
.
The CRT display device
35
receives this signal at the USB function
33
and the signal is sent to the MPU
17
. The MPU
17
interprets the contents of the received signal. When it indicates adjustment of the brightness of the displayed screen, for example, it adjusts the image signal amplifying portion
10
to vary the magnitude of the signal voltage supplied to the drive portion
24
from the image signal amplifying portion
10
. When it indicates adjustment of the position, for example, the MPU
17
adjusts the screen adjusting portion
19
to adjust the phase relation between the image signal outputted from the drive circuit
24
and the sync. signal, so as to adjust the position of the image.
When the USB cable
34
is connected to the PC
30
, the communication can be established when the following conditions are satisfied: whether the PC
30
contains the USB function; whether signals can be properly sent/received between the PC
30
and the CRT display device
35
when the USB controller
32
in the PC
30
and the USB function
33
in the CRT display device
35
are connected to each other, for example. Furthermore, depending on the model of the PC
30
, some operations may be required before making the communication; software for enabling the functions of the USB to work has to be installed, for example.
While a DDC (Direct Digital Control) communication line provided in the image signal cable
9
together with the image signal may be utilized, it requires special DDC driver software since the DDC signal is outputted via a graphic chip in the PC
30
(not shown).
The conventional device requires that the USB controller and driver software should be provided on the PC and that a cable for USB should be connected besides the image signal cable. It further requires special environment, such as the USB function on the picture display device.
When the DDC communication is used, special DDC driver software is required since the signal is outputted via a graphic chip in the PC, and this method is not practical because it is necessary to prepare many pieces of driver software produced by different manufactures since graphic chips produced by different manufacturers require different pieces of driver software.
Furthermore, data for &ggr; (gamma) correction on the picture display device and font data for OSD are generated by data generating software on the PC, and the data must be once stored in a medium like a floppy disk and the data is set in the picture display device from a dedicated writing device by using the data stored in the medium.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention, a picture display control system comprises: an image signal generating device for adding screen adjusting control information for screen adjustment to an image signal and outputting the image signal; and a picture display device having picture display means receiving as an input the image signal to which the screen adjusting control information is added and which is outputted from the image signal generating device; detecting means for detecting the screen adjusting control information from the image signal to which the screen adjusting control information is added; and screen adjusting means for making adjustment on the basis of the screen adjusting control information detected by the detecting means.
Preferably, according to a second aspect, in the picture display control system, the image signal generating device comprises screen adjusting control information adding means for adding the screen adjusting control information to the image signal by replacing part of the image signal with the screen adjusting control information, and the detecting means comprises a screen adjusting control information extracting portion for extracting the segment bearing the screen adjusting control information from the image signal to which the screen adjusting control information is added, and an adjusted item determining portion for identifying adjusted items and adjusting data from the extracted screen adjusting control information and setting data in corresponding adjusting means in accordance with the identified result.
Preferably, according to a third aspect, in the picture display control system, the screen adjusting control information adding means adds the screen adjusting control information to the image signal as tone information in part of pixels among pixels forming a displayed picture, and the detecting means extracts the screen adjusting control information by using at least one threshold from the image signal to which the screen adjusting control information is added.
Preferably, according to a fourth aspect, in the picture display control system, the screen adjusting control information adding means inserts signal in a bit in one arbitrary position in tone data when the tone information is represented as digital data.
Preferably, according to a fifth aspect, in the picture display control system, the screen adjusting control information is added in place of part of the image signal in a picture display period or an image non-display period.
Preferably, according to a sixth aspect, in the picture display control system, the
NEC-Mitsubishi Electric Visual Systems Corporation
Patel Nitin
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