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
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
  • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
  • G09G5/006—Details of the interface to 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
  • 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
  • G09G1/167—Details of the interface to the display terminal specific for a CRT
• • 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

Definitions

• the large number of different personal computers and monitors has resulted in different operating modes being created for the input signals required by the monitors. This circumstance has hitherto prevented any monitors from being easily operated on the same personal computers. Rather, a separate adapter card had to be used for each operating mode.
• the operating modes differ essentially by their line frequency, image frequency, number of lines, the horizontal and vertical amplitude and by their formats that can be used within the screen format.
• the invention has for its object to provide a method which evaluates operating mode-specific features from the signal of the personal computer intended for the monitor in order to bring about an automatic adaptation of the monitor.
• the operating values of frequently recurring operating modes are stored. This can be done, for example, by setting test signals beforehand, after the end of which the operating values then obtained are transferred to the memory provided for this purpose.
• the operating values are stored under mode-specific addresses, so that when one of the addresses is selected, all the required operating values can be tapped at the output of the memory. If the horizontal and vertical synchronous signals from the personal computer are successfully To determine the mode of operation, the address assigned to this mode of operation can be addressed and the mode of operation can be set in such a way that the corresponding control signals reach the horizontal and vertical deflection stage of the monitor. Since the setting takes place immediately after the reception of horizontal and vertical synchronizing signals, the setting time required is hardly perceptible to the user.
• the period duration of the horizontal synchronizing signals is determined by measuring several periods and dividing by the number of synchronizing signals. In this way it is possible to achieve a high measuring accuracy despite the clock frequency of the microprocessor which is in the same order of magnitude as the horizontal frequency, without additional circuits being required.
• a video test signal is provided in order to enable an exact setting when the operating values are set for the first time or when the multi-mode monitor is used, which does not later require any corrections. So it is certain that the entire dynamic range can be used by the analog / digital converter. Since the video test signal is essentially intended to adjust the amplitude and phase of the horizontal and vertical deflection, a simple construction of the test signals is sufficient for this. It is only essential that the corresponding markings occur at precisely defined times, so that there is a connection between the test signals visible on the screen and the specification of the operating values.
• the video test signals are generated as a serial data stream and are taken from a serial output of a microprocessor.
• the data stream can be generated by a shift register which was previously loaded in a subroutine in accordance with the intended image pattern and which is started after a main program has been interrupted. The normal program flow can then be continued during the serial data stream. It is enough from restarting the video signal periodically in a subroutine loop after each horizontal synchronizing signal.
• the invention further relates to a device for adapting a multi-mode monitor to a personal computer.
• the microprocessor enables the storage of all required operating values for the operating modes in question and is also able to evaluate the horizontal and vertical synchronizing signals of the personal computer as a criterion for which operating values are to be set. This can be done by storing the values for the horizontal and vertical synchronizing signal period in a memory and comparing these values with the measured ones. If there is a match, then memory locations can be addressed which contain predetermined operating values and whose addressing causes control signals for setting the operating values to be transmitted to the horizontal and vertical deflection stage of the monitor.
• the dynamic digital / analog converters provided according to a further development for converting the digital signals into analog signals can be constructed very simply and ⁇ -
• FIG. 2 shows a block diagram of a circuit arrangement according to the invention.
• FIG. 1 The process sequence shown in FIG. 1 in the form of a flow chart begins with start 1. After start 1, a decision is made in 2 as to whether the signal arrives at the TTL input. If this is the case, the method is continued in FIG. 3 with the measurement of the horizontal and the vertical frequency. If this is not the case, switch from the TTL input to the analog input in 4 and check in 5 whether the signal now reaches the analog input. If this is the case, the method step under 3 continues, if this is not the case, the TTL input is switched to the analog input in FIG. 6 and the system jumps back to the decision in FIG. 2.
• the frequency is displayed in FIG. 7 and compared with stored operating values in FIG. It is now checked in FIG. 9 whether a pair of operating values has been recognized. If this is the case, the corresponding memories are addressed in FIG. 10 and the contents of the memory are read out. After a digital-analog conversion of the stored data carried out in FIG. 11, the horizontal and vertical stages are actuated in FIG. 12 by means of corresponding analog control signals. After completion of this method step, a query 13 checks whether the operating signal has changed. If this is the case, the system jumps back to the start and runs through the described method steps again.
• the keyboard is then scanned in 14 in order to take into account desired values for brightness, contrast, horizontal or vertical amplitude and horizontal or vertical position. In the following, it is checked in FIG. 15 whether a video test signal is desired. If this is the case, a video test routine is called in 16 and jumped back to 14 in order to change the corresponding values using the keyboard. If no video test signal is desired, the program jumps back after 13.
• FIG. 17 If an operating value pair is not recognized in FIG. 9, a branch is made to FIG. 17, where it is checked whether the new pair of horizontal and vertical frequencies should be stored. If this is the case, the storage locations for the deflection stage and the operating values are stored and prepared in FIG. If this is not the case, there is a jump to 13.
• FIG. 2 From personal computers 20, 21, of which one 20 has a TTL adapter card and the other 21 has an analog adapter card, the signals intended for the monitor reach inputs 22 and 23 of the device 24.
• the signals are transmitted by a switch 24 and a signal conversion circuit to a microcomputer 25.
• Video components of the signal also reach a monitor 27 directly via a video stage 26.
• a control line 28 leads from the microcomputer 25 back to the switch 24, which makes it possible to adapt TTL signals and analog signals to the microcomputer 25 and the monitor 27.
• the microcomputer 25 includes a CPU 28, a ROM 29 and a RAM 30. Memory locations are available in the RAM 30 for different operating modes.
• the digital / analog converters 31 to 37 pass control signals further to a video stage 26 or a horizontal deflection stage 39 or a vertical deflection stage 40.
• a display unit 41 and an input unit 42 are also connected to the microcomputer 25.
• the horizontal and vertical amplitude, the horizontal and vertical position as well as brightness and contrast can be set via the input unit 42.
• a video test signal can be activated. If there is interest in holding a pair of frequency values, this can be stored in the RAM 30 using a memory command key.
• a personal computer with the corresponding operating mode can then be automatically adapted to the other operating modes on the monitor using the pair of values from the horizontal and vertical frequencies.
• the signals at the input of the microcomputer 25 intended for the monitor are evaluated by the microcomputer 25 with regard to the period of their horizontal and vertical synchronizing signals.
• This pair of values is compared with pairs of values stored in RAM 30, and if the same pairs of values are identified, the associated memory locations are addressed and then read out.
• the stored values representing the corresponding operating values are then converted via the digital / analog converters 31 to 37 into corresponding control signals, namely the control signals of the digital / analog converter 31 determine the brightness and the contrast, those of the analog / Digital converters 32 and 35 the horizontal and vertical frequencies, those of the digital / analog converters 33 and 36 the horizontal and vertical amplitudes and those of the digital / analog converters 34 and 37 the phase position of the horizontal and Vertical deflection.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Computer Hardware Design (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Remote Sensing (AREA)
• Radar, Positioning & Navigation (AREA)
• Controls And Circuits For Display Device (AREA)
• Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
• Maintenance And Management Of Digital Transmission (AREA)
• Details Of Television Scanning (AREA)
• Selective Calling Equipment (AREA)
• Debugging And Monitoring (AREA)
• Digital Computer Display Output (AREA)
• Measurement Of Resistance Or Impedance (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6330926

Family Applications (2)

Family Applications After (1)

Country Status (12)

Families Citing this family (49)

Family Cites Families (8)

• 1987
  • 1987-07-04 DE DE3722169A patent/DE3722169C2/de not_active Expired - Lifetime
• 1988
  • 1988-07-01 EP EP88905792A patent/EP0322435A1/de active Pending
  • 1988-07-01 US US07/332,847 patent/US5031118A/en not_active Expired - Fee Related
  • 1988-07-01 KR KR1019890700315A patent/KR970005119B1/ko not_active Expired - Fee Related
  • 1988-07-01 JP JP63505713A patent/JP2598503B2/ja not_active Expired - Lifetime
  • 1988-07-01 AT AT88110539T patent/ATE80959T1/de not_active IP Right Cessation
  • 1988-07-01 WO PCT/EP1988/000581 patent/WO1989000325A1/de active IP Right Grant
  • 1988-07-01 EP EP88110539A patent/EP0298390B1/de not_active Expired - Lifetime
  • 1988-07-01 ES ES198888110539T patent/ES2035170T3/es not_active Expired - Lifetime
  • 1988-07-01 DE DE8888110539T patent/DE3874823D1/de not_active Expired - Lifetime
• 1989
  • 1989-03-03 FI FI891041A patent/FI95084C/fi active IP Right Grant
• 1992
  • 1992-12-23 GR GR920403106T patent/GR3006652T3/el unknown
• 1993
  • 1993-05-04 SG SG581/93A patent/SG58193G/en unknown
• 1994
  • 1994-08-11 HK HK79394A patent/HK79394A/xx not_active IP Right Cessation

Non-Patent Citations (1)

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