GB2331902A - Remote control of monitor by amplitude modulation of synchronising signals - Google Patents
Remote control of monitor by amplitude modulation of synchronising signals Download PDFInfo
- Publication number
- GB2331902A GB2331902A GB9818631A GB9818631A GB2331902A GB 2331902 A GB2331902 A GB 2331902A GB 9818631 A GB9818631 A GB 9818631A GB 9818631 A GB9818631 A GB 9818631A GB 2331902 A GB2331902 A GB 2331902A
- Authority
- GB
- United Kingdom
- Prior art keywords
- data packet
- serial data
- monitor
- bit
- video
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
- G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
- G09G1/14—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible
- G09G1/16—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster
- G09G1/165—Details of a display terminal using a CRT, the details relating to the control arrangement of the display terminal and to the interfaces thereto
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/153—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using cathode-ray tubes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0606—Manual adjustment
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/08—Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Hardware Design (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- Television Systems (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The method comprises the steps of: a) preparing an N-bit serial data packet in response to user's commands and/or data to control display characteristics of the monitor; b) inserting each bit of the serial data packet from the step a) into the R, G and B video signals by varying the amplitude of the synchronising signals in the blanking periods according to the logic levels of each bit of the serial data packet; c) transmitting the R, G, and B video signals having the serial data packet inserted in the step b) and the horizontal and vertical synchronization signals to the monitor via a video cable; d) extracting each bit of the serial data packet from the R, G, and B video signals among the transmitted signals in the step c); and e) controlling display characteristics corresponding to the serial data packet extracted in the step d). Accordingly, the control data for adjusting the display characteristics can be transmitted to the monitor without additional communication channels between the host computer and the monitor or without requiring new device for the host computer.
Description
2331902 REMOTE CONTROL OF MONITOR The present invention relates to a
method for remotely controlling display characteristics of a monitor, and more particularly to a method for controlling display characteristics of a monitor by transmitting control data through video signal lines from a host computer.
A monitor is an important constituent of a general-purpose computer system and occupies a considerable portion of the total cost of a system. The monitor is a user interface of the system and it provides information to the user in both graphic and text form.
Manufacturers of monitors try to improve the monitor by enhancing display characteristics such as resolution, contrast and clarity. As time goes by, epochal improvements have been made but not without problems and expenses. For example, most recent monitors include microprocessors to process control routines for complex operations such as power management for power saving.
Conventional monitors have built-in control terminals for controlling display charactenstics such as brightness, contrast, picture position and size. The control terminals are composed of rotary potentiometers and they are distributed at different locations around a monitor case. The locations are determined by each manufacturer, and so these control terminals can be located on the front, side, lower, and upper faces of the case. In addition, the control terminals for brightness and contrast may be separately located from the control terminals for picture position and size. The control terminals can be designed in digital or in analog and there are few industry standards for the control terminals on monitors. Accordingly, locations and types ie control terminals of 1 monitors can be widely varied.
Particularly, in a cathode ray tube monitor, the control terminals for brightness and contrast interact with a video circuitry in the monitor and modulate a video signal by varying electrical potential to one or more control grids, thereby interfering emission from a cathode filament. For example, the brightness control terminal adjusts the level of scanning electron beam and this makes an image on the screen brighter or less bright. The contrast is controlled by the linear relation between strength of incoming video signal and brightness of the current screen.
The above described control terminals must be accessed under various circumstances. For example, as ambient light conditions are varied at different times of a day, the brightness adjustment is required according to these conditions. In addition, as brightness and contrast are interactive each other, when one is adjusted the other must be adjusted. In order to adjust the control terminals, the user has to know their locations on the case and directly operates these control terminals. Moreover, the user hardly know adjustment limits or the present position. Accordingly, an easier and more convenient method for controlling the display characteristics of the monitor is required.
To satisfy these requirements, an Inter-Integrated Circuit (I'C) bus is used as a bidirectional communication channel for connecting input/output (1/0) devices to the host computer. In the VC bus, information of devices connected thereto is transmitted through a serial data (SDA) line and a serial clock (SCL) line. Each device on the J2 C bus is identified by a unique address whether it's a microprocessor, a liquid crystal display (LCD), a driver, a memory or a keyboard interface and can operate as either a transmitter or a receiver, depending on the function of the device. Namely, when the microprocessor of the monitor is connected to the host computer with the J2 C bus, one bit of information is 2 transmitted from the transmitter to the receiver according to an I2C protocol, where the host computer functions as the transmitter and the microprocessor of the monitor functions as the receiver. At this time, if the I2C bus is a serial bus of 8 bits, the transmission rate of data is up to 100kbits/sec in a standard mode and 400kbits/sec in a fast mode.
However, for the transmission of the control data for adjusting the display characteristics from the host computer to the microprocessor of the monitor by using the 0 J2 C bus, interfaces of the J2 C bus are equipped into the host computer and the monitor respectively, which requires additional cost and additional space onto printed circuit boards (PCBs). Moreover, since the I2C bus is sensitive to external causes such as a high voltage spike of the monitor, error rate may be increased during the data transmission. In addition, Z the host computer and the monitor which do not support the I2C bus can not transmit or receive necessary control data and thus additional communication channel is required.
In view of the foregoing, it is an object of the present invention to provide a method for remotely controlling display characteristics of a monitor by transmitting control data from a host computer through video signal lines of a video cable without any additional communication channel.
According to the present invention there is provided a method for remotelv controlling a monitor using video signal lines in a general-purpose computer system having a video cable for transmitting R, G, and B video signals and horizontal and 1:1 0 C vertical synchronization signals from a host computer to the monitor characterized by comprising the steps of: a) preparing N bits of serial data packet in response to user's commands and/or data to control display characteristics of the monitor; b) inserting each 1 bit of the serial data packet from step a) into a plurality of blanking periods of the R, G and B video signals, respectively; c) transmitting the R, G. and B video 3 signals having the serial data packet inserted in the step b) and the horizontal and vertical synchronization signals to the monitor via the video cable; d) extracting each bit of the serial data packet from the R, G, and B video signals among the transmitted signals in the step c); and e) controlling display charactenstics correspond ing to the senal data packet extracted in the step d).
According to the present invention there is also provided a method for remotely controlline a monitor using video signal lines in a general-purpose computer system having l> 0 a video cable for transmitting R, G, and B video signals and horizontal and vertical synchronization signals from a host computer to the monitor characterized by comprising the steps of. a) preparing a senal data packet in response to user's commands and/or data to 0 control display characteristics of the monitor; b) inserting each bit of the serial data packet from the step a) into one more among the R, G and B video signals by varying an 1 amplitude of a synchronization pulse within blanking penods of the R, G and B video signals according to logic levels of each bit of the senal data packet and transmitting the R, 1 G, and B video signals having the serial data packet and the horizontal and vertical :0 synchronization signals to the monitor via the video cable; c) extracting each bit of the senal data packet from the R, G, and B video signals among the transmitted signals in the step b); and d) controlling display characteristics corresponding to the serial data packet extracted in the step c).
The above and other ob. ects, features, and advantages of the present invention will 9 W be apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings, in which:
Fig. 1 is a block diagram illustrating a host computer connected to a monitor for carrying out a remote control method of a monitor according to the present invention, and 4 Fig. 2 is a diagram illustrating an example of control data inserted in R, G, and B video signals of Fig. 1 according to the present invention.
Referring to the accompanying drawings, detailed description of the preferred embodiment will be given. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Fig. 1 shows a block diagram illustrating a host computer 20 connected to a monitor 40 for carrying out a remote control method of a monitor according to the present invention.
The host computer 20 comprises a CPU 21 for managing computer functions, executing logic and performing computations, a memory 22 for storing control routines and data, a basic input-output system (BIOS) 23, a key-board controller 24 coupled to a key-board 11, a pointer port 25 coupled to a pointer device 12, a video BIOS 26, a video circuitry 27, and a cable interface 28. The elements described above are connected by one or more bus structures by an inter-connecting bus 29. R, G and B video signals, horizontal and vertical synchronization signals from the cable interface 28 and ground connections are transmitted to the monitor 40 via a video cable 30 having a video adapter in the side of the monitor 40. Meanwhile, the key-board 11 can be substituted with input devices such as touch screens, pen-pads, and the like.
The monitor 40 comprises a controller 41, an adjustment circuitry 42, a CRT circuitry 43, and a power supply 44. The controller 40 and the CRT circuitry 43 are driven by the power supply 44 having a main section and a standby section. The controller 41 may comprise any one of several suitable, commercially available micro controllers or microprocessors, or it may be a proprietary unit manufactured specifically for the purpose of controlling display characteristics according to the present invention.
Referring to Fig. 1, the mechanism for transmitting user's commands and/or data from the host computer 20 to the controller 41 according to the present invention will be described as follows.
The video circuitry 27 generates and provides the R, G and B video signals and horizontal and vertical synchronization signals to the monitor 40 via the cable interface 28 and the video cable 30. At this time, whenever user's command and/or data are generated to control the display characteristics, a serial data packet indicating them is inserted into a plurality of blanking periods of R, G and B video signals, thereby having no effect on picture quality of the monitor 40. As is well known, the blanking periods of the R, G and B video signals are synchronized to the horizontal synchronization signal and the period of these video signals varies depending on a number of factors such as the clock rate of the computer system, the frequency of the horizontal synchronization signal and the resolution of the monitor. That is, in the video circuitry 27, an amplitude of a synchronization pulse included within the blanking period of the video signals is varied according to the logic level of each bit of the serial data packet by using the control routines stored in the memory 22 under the control of the CPU 21.
For example, to adjust the brightness of the monitor 40, the user accesses a screen window by using a cursor controlled by the pointer device 12. Then, the computer system indicates the current brightness setting in the adjustable range and the user may then move the cursor to a new position indicating an increase or decrease in brightness. In response to user's brightness command and data above, the host computer 20 prepares a serial data packet and the serial data packet is stored in the memory 22. Then, the host computer 20 detects the R, G and B video signals at the first pulse occurrence of the horizontal synchronization signal after the user's command and/or data are applied and inserts the 6 serial data packet to be sent into the blanking periods of the R, G and B video signals according to the principle proposed in the present invention. The R, G and B video signals having the serial data packet are transmitted to the controller 41 via the video cable 30 together with the horizontal and vertical synchronization signals.
The controller 41 is configured to recognize the serial data packet inserted on the R,G and B video signals, and designed to accomplish the desired alternation in display characteristics. That is, the controller 41 receives the signals transmitted from the host computer 20 via the video cable 30 and extracts the serial data packet, that is, control data, from the R,G and B video signals among the transmitted signals. The adjustment circuitry 42 generates a control signal, for example, a brightness control signal, for adjust display characteristics corresponding to the serial data packet from the controller 41 and provides the control signal to the CRT circuitry 43.
Fig. 2 illustrates an example of R, G and B video signals with a serial data packet inserted. The total 9 bits of serial data packet including I byte of control data and I bit of =1 a parity bit are inserted during blanking periods in each of the R, G and B video signals.
For example, when the control data by the user's commands and/or data are encoded as '1100 1100', '1100 11000' is finally transmitted from addition of the p arity bit V depending to the number of I's in the encoded result. As shown in Fig. 2, '1', '1', and V are transmitted sequentially during the first blanking period (BT1) of the F, G, and B I video signals. During the second blanking period (BT2), V, '1' and '1' are transmitted sequentially with the R, G and B video signals. And, during the third blanking period (BT3), V, V, and the parity bit '0' are transmitted sequentially with the R, G, and B video signals.
7 In brief, during three blanking periods, 1 byte of bit stream '1100 1100' and the parity bit of '0' are transmitted. The parity bit becomes '0' if the number of I's in the bit stream is an even number, and it becomes 'I' if the number of I's in the bit stream is an odd number. Of course, it is possible to consider the contrary thereof. So, the error generated during the data transmission can be easily detected in the controller 41 by the parity bit.
As described above, when transmitting the control data of 9 bits by using the video signal lines, the transmission rate Tr of data can be obtained by the following mathematical expression 1.
[Mathematical Expression 1] Tr=fHI9 (Kbyteslsec) where, & is a frequency of the horizontal synchronization signal.
Namely, when the transmission rate of data in VGA mode is calculated by using the mathematical expression 1, the transmission rate of data is 3. 44Kbytes/sec since the frequency of the horizontal synchronization signal in the VGA mode is 31. 5KHz. This data transmission rate is high enough to substitute the VC bus in the standard mode.
The control data are transmitted by using the blanking periods of all the F, G and B video signals in the embodiment of the present invention. However, in case that the data transmission rate is not seriously considered, the blanking periods of only one or two signal(s) among the R, G and B video signals can be used for transmitting the control data.
In the embodiment of the present invention, the control data only for controlling the display characteristics like brightness, contrast, picture position and size are described, however, it can be applied to the control data for managing the power supply of the monitor or for controlling the functions such as video mode change.
8 Even though the serial data packet is composed of I byte of user's command and/or data and I bit of parity bit in the embodiment of the present invention, the composition can be easily changed 0 As described above, according to the present invention, the control data can be Z transmitted by adjusting the amplitude of the synchronization pulse included in the blanking periods of the R, G and B video signals. Accordingly, the control data for adjusting the display characteristics can be transmitted from the host computer to the monitor without additional communication channels and without any deterioration of picture quality. Moreover, the method according to the present invention can be applied to all kinds of video cards by providing control routines thereof with the host computer and the monitor.
While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
9
Claims (7)
1. A method for remotely controlling a monitor using video signal lines in a general-purpose computer system having a video cable for transmitting R, G, and B video signals and horizontal and vertical synchronization signals from a host computer to the monitor, characterized by comprising the steps of.
a) preparing N bits of serial data packet in response to user's commands and/or data to control display characteristics of the monitor; b) inserting each bit of the serial data packet from said step a) into a plurality of blanking periods of the R, G and B video signals, respectively; c) transmitting the R, G, and B video signals having the serial data packet inserted in said step b) and the horizontal and vertical synchronization signals to the monitor via the video cable; d) extracting each bit of the serial data packet from the R, G, and B video signals among the transmitted signals in said step c); and e) controlling display characteristics corresponding to the serial data packet extracted in said step d).
2. The method of claim 1, characterized in that the N bits of the serial data packet comprises a bit stream corresponding to the user's commands and/or data and a parity bit, wherein N is integer times of 3.
3. The method of claim 2, characterized in that each bit of the serial data packet is sequentially inserted into a synchronization pulse within the blanking periods of the R, G and B video signals, respectively.
4. The method of claim 3, characterized in that an amplitude of the synchronization pulse is varied by the logic level of each bit of the serial data packet.
5.
A method for remotely controlling a monitor using video signal lines in a general-purpose computer system having a video adapter for transmitting R, G, and B video signals and horizontal and vertical synchronization signals from a host computer to the monitor, characterized by comprising the steps of.
a) preparing a serial data packet in response to user's commands and/or data to control display characteristics of the monitor; b) inserting each bit of the serial data packet from said step a) into one more 1 among the R, G and B video signals by varying an amplitude of a synchronization pulse within blanking periods of the R, G and B video signals according to logic levels of each 1 bit of the serial data packet and transmitting the R, G, and B video signals having the serial data packet and the horizontal and vertical synchronization signals to the monitor via the video cable; c) extracting each bit of the serial data packet from the R, G, and B video signals among the transmitted signals in said step b); and d) controlling display characteristics corresponding to the serial data packet 1 extracted in said step c).
6. The method of claim 5, characterized in that the serial data packet comprises a bit stream corresponding to the user's commands and/or data and a parity bit.
11
7. A method for remotely controlling a monitor using video signal lines substantially as herein described with reference to or as shown in the accompanying drawings.
12
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970064423A KR100257547B1 (en) | 1997-11-29 | 1997-11-29 | Method of communication between pc and monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9818631D0 GB9818631D0 (en) | 1998-10-21 |
| GB2331902A true GB2331902A (en) | 1999-06-02 |
Family
ID=19525992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9818631A Withdrawn GB2331902A (en) | 1997-11-29 | 1998-08-26 | Remote control of monitor by amplitude modulation of synchronising signals |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100257547B1 (en) |
| GB (1) | GB2331902A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993006587A1 (en) * | 1991-09-20 | 1993-04-01 | Icl Personal Systems Oy | A method for controlling a display device in a display system, and a display system and a display device |
| WO1993022759A1 (en) * | 1992-04-24 | 1993-11-11 | Icl Personal Systems Oy | Computer display system |
| EP0586097A2 (en) * | 1992-08-04 | 1994-03-09 | Sony Corporation | Contrast control circuit |
| EP0645750A1 (en) * | 1993-09-28 | 1995-03-29 | Koninklijke Philips Electronics N.V. | Arrangement for adjusting monitor settings in a picture display system |
| US5457473A (en) * | 1992-02-20 | 1995-10-10 | Hitachi, Ltd. | Image display apparatus |
| US5550556A (en) * | 1993-11-01 | 1996-08-27 | Multivideo Labs, Inc. | Transmitting data and commands to display monitors |
-
1997
- 1997-11-29 KR KR1019970064423A patent/KR100257547B1/en not_active IP Right Cessation
-
1998
- 1998-08-26 GB GB9818631A patent/GB2331902A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993006587A1 (en) * | 1991-09-20 | 1993-04-01 | Icl Personal Systems Oy | A method for controlling a display device in a display system, and a display system and a display device |
| US5457473A (en) * | 1992-02-20 | 1995-10-10 | Hitachi, Ltd. | Image display apparatus |
| WO1993022759A1 (en) * | 1992-04-24 | 1993-11-11 | Icl Personal Systems Oy | Computer display system |
| EP0586097A2 (en) * | 1992-08-04 | 1994-03-09 | Sony Corporation | Contrast control circuit |
| EP0645750A1 (en) * | 1993-09-28 | 1995-03-29 | Koninklijke Philips Electronics N.V. | Arrangement for adjusting monitor settings in a picture display system |
| US5550556A (en) * | 1993-11-01 | 1996-08-27 | Multivideo Labs, Inc. | Transmitting data and commands to display monitors |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9818631D0 (en) | 1998-10-21 |
| KR19990043422A (en) | 1999-06-15 |
| KR100257547B1 (en) | 2000-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |