CN1139334A - On-screen display circuit for video display appliance - Google Patents
On-screen display circuit for video display appliance Download PDFInfo
- Publication number
- CN1139334A CN1139334A CN96105122A CN96105122A CN1139334A CN 1139334 A CN1139334 A CN 1139334A CN 96105122 A CN96105122 A CN 96105122A CN 96105122 A CN96105122 A CN 96105122A CN 1139334 A CN1139334 A CN 1139334A
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- China
- Prior art keywords
- screen
- signal
- video
- blanking
- green
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- 206010051819 Cyanopsia Diseases 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/641—Multi-purpose receivers, e.g. for auxiliary information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Controls And Circuits For Display Device (AREA)
- Details Of Television Scanning (AREA)
- Filters And Equalizers (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Color Television Systems (AREA)
Abstract
An on-screen display circuit for a video display appliance which can display on-screen signals in a specific position of a display screen when the on-screen signals are provided. The onscreen display circuit includes an on-screen processing section for providing the on-screen signals under the control of a microcomputer, a switching section which is controlled by a fast blanking signal outputted from the on-screen processing section to select and provide one of the on-screen signals and input video signals, a video output section for amplifying the onscreen signals or the video signals outputted from the switching section, and outputting the amplified signals to cathode terminals of a cathode-ray tube, and a blanking control section which is controlled by a sync signal separated from the video signals and the fast blanking signal outputted from the on-screen processing section to provide a blanking signal to the video output section.
Description
Relate generally to video display apparatus of the present invention.Especially, the present invention relates to when screen signal (on-screen signal) is provided can be at the on-screen display circuit of the video display apparatus of the ad-hoc location display screen signal of display screen.
As shown in Figure 1, the video display circuit of Chang Gui video display apparatus comprises driving voltage output 1a, 1b and the 1c that is provided for the driving voltage of red, green and blue vision signal by dividing potential drop Vcc supply voltage; A video preprocessor amplifier 2 is used for basis from R, the G of driving voltage output 1a, 1b and 1c output and red (R) that the B driving voltage amplifies input in advance, green (G) and blue (B) vision signal; With a video output 3, be used to amplify R, G and B vision signal from 2 outputs of video preprocessor amplifier, R, the G of amplification and R, G and B cathode terminal Rk, Gk and the Bk that the B vision signal arrives the cathode ray tube (CRT) (not shown) are provided.
The following describes operation according to the video display circuit of the conventional video display apparatus of above-mentioned formation.
The R of personal computer etc., G and B vision signal are input to video preprocessor amplifier 2 by capacitor C1, C2 and C3.Be input to R, the G of video preprocessor amplifier 2 and B vision signal according to from driving voltage output 1a, 1b with 1c is input to respective drive end Rd, the Gd of video preprocessor amplifier 2 and the driving voltage of Bd is amplified in advance.At this moment, the driving voltage that is input to drive end Rd, the Gd of prime amplifier 2 and Bd utilizes resistor R 1, R2 and R3 in driving voltage output 1a, 1b and 1c and variable resistor VR1, VR2 and VR3 to come dividing potential drop Vcc supply voltage to provide.
After this, be input to after from R, the G of corresponding video output Ro, the Go of video preprocessor amplifier 2 and Bo output and B vision signal and by 3 amplifications of video output by resistance R 4 to R9 dividing potential drops.Cathode terminal Rk, Gk and Bk that R, G that amplifies and B vision signal output to CRT, the result shows this vision signal on the CRT screen.
But aforesaid conventional video display circuit shortcoming is: because R, G and the B vision signal that provides from signal source such as personal computer only is provided on this screen for it, it can not provide the screen display with predetermined luminance at the ad-hoc location of CRT screen.
The on-screen display circuit that can show the video display apparatus of screen signal when an object of the present invention is to solve the problem that relates in the prior art and being provided at screen signal at the ad-hoc location of display screen with predetermined luminance.
To achieve these goals, provide a kind of on-screen display circuit of video display apparatus, comprising:
A microcomputer is used to control screen display;
The screen processing unit provides the red, green and blue screen signal under the control of microcomputer;
Switching device, it by the quickly-blanking signal controlling that provides from the screen processing unit selecting and to provide one of red, green and blue screen signal, and input red, green and blue vision signal;
The red, green and blue vision signal of amplifying the red, green and blue screen signal or providing from switching device is provided video output device, and the output amplifying signal is to the red, green and blue cathode terminal of cathode ray tube; With
Blanking control circuit, it provides blanking signal to arrive this video output device by from the isolated synchronizing signal of vision signal with from the quickly-blanking signal controlling that the screen processing unit provides.
Even more preferably, this synchronizing signal may be a horizontal-drive signal.And preferably further comprise buffer unit according to on-screen display circuit of the present invention, be used for buffer memory offers this switching device from the screen processing unit red, green and blue screen signal.
Narrate the preferred embodiments of the present invention in conjunction with the drawings, above-mentioned purpose of the present invention, further feature and advantage are just clearer, wherein:
Fig. 1 is the video display circuit and the schematic circuit diagram of conventional video display apparatus.
Fig. 2 is the schematic circuit diagram according to the on-screen display circuit of video display apparatus of the present invention.
Fig. 3 A is the view of the switch sections operation of explanation Fig. 2 when the quickly-blanking signal is low level state.
Fig. 3 B is the view of the switch sections operation of explanation Fig. 2 when the quickly-blanking signal is high level state.
Fig. 3 C is the truth table of switching manipulation of the switch sections of key diagram 2.
Fig. 4 A to 4D is the oscillogram in the each point generation of Fig. 2 circuit.
Fig. 2 represents the on-screen display circuit according to video display apparatus of the present invention.Referring to Fig. 2, on-screen display circuit according to the present invention comprises driving voltage output 1a, 1b and 1c, is used for providing R, G and B driving voltage by dividing potential drop Vcc supply voltage; A video preprocessor amplifier 2, R, G and the B vision signal of amplifying input in advance according to R, G and B driving voltage from driving voltage output 1a, 1b and 1c output; A microcomputer 4 is used to control screen display; A screen processing section 5 provides R, G and B screen signal under the control of microcomputer 4; A bumper portion 6 is used for R, G and B screen signal that buffer memory provides from screen processing section 5; With a switch sections 7, the quickly-blanking signal controlling that it is provided by screen processing section 5, and select and provide from R, the G of 2 outputs of video preprocessor amplifier and B vision signal and from one of R, the G of bumper portion 6 outputs and B screen signal.
Also comprise a blanking control section 8 according to on-screen display circuit of the present invention, it is by providing the video blanking signal from the isolated horizontal-drive signal Hsync of vision signal with from the quickly-blanking signal FB control that screen processing section IC5 provides; With a video output 3, be used to amplify R, G and B vision signal or the R that provides from switch sections 7, G and B screen signal, and the output amplifying signal is to R, G and the B cathode terminal of cathode ray tube (CRT) (not shown).
In the accompanying drawings, label R1 to R21 represents resistor, and C1 to C9 represents capacitor, and VR1 to VR3 represents variable resistor, and Q1 to Q6 represents transistor.
Explanation is according to the operation of the on-screen display circuit of the video display apparatus of the present invention of above-mentioned formation now.
Referring to Fig. 2, the R of input, G and B are input to video preprocessor amplifier 2 by capacitor C1, C2 and C3.The R that is imported, G and B vision signal are amplified in advance according to driving voltage, and this driving voltage is drive end Rd, Gd and the Bd that offers video preprocessor amplifier 2 from driving voltage output 1a, 1b and 1c.
Especially, provided under the situation of R, G and B screen signal from screen processing section 5 by microcomputer 4 controls, the quickly-blanking signal FB of 5 outputs becomes high level from the screen processing section, offers control end Sa, Sb and the Sc of switch sections 7 then.Fig. 3 is the switching manipulation truth table of explanation according to the switch sections 7 of quickly-blanking signal FB.Therefore, conversion switch part 7 is selected screen signal, and they provide by bumper portion 6 from screen processing section 5, and selected screen signal is input to video output 5.
At the same time, the quickly-blanking signal FB of 5 outputs also is input to blanking control section 8 from the screen processing section.Therefore, blanking control section 8 output blanking signals make this vision signal being shown by the ad-hoc location of the screen of blanking to the blanking control end BLK of video output 3, are used for the demonstration at the screen signal of same position.On the other hand, blanking control section 8 is also exported this blanking signal according to the input level synchronizing signal.
Fig. 4 A to 4D is the oscillogram of explanation according to on-screen display circuit operation of the present invention.Referring to Fig. 4 A to 4D, explain according to screen display operation of the present invention.
If the horizontal-drive signal H shown in Fig. 4 B
SyncBe added to the transistor Q5 in the blanking control section 8, then at horizontal-drive signal H
SyncLow period between transistor 25 end.Therefore, produce as shown in Figure 4 anti-phase horizontal-drive signal at the point " P1 " of this circuit, thus transistor Q6 conducting to make point " P2 " be low level state.
At this state, if provide screen signal under the control of microcomputer 4, as shown in Fig. 4 A, quickly-blanking signal FB becomes high level.High level quickly-blanking signal FB is added to the base stage of transistor Q4 then, makes transistor Q4 conducting, and therefore making the point ' P2 ' of this circuit is low level state.So, as shown in Fig. 4 D, produce at the point ' P2 ' of circuit and to have the blanking signal of such waveform, wherein union is carried out in the output of the output of transistor Q6 and transistor Q4, is input to the blanking control end BLK of video output 3 then.
Especially, if screen signal is not provided, then quickly-blanking signal FB becomes low level, so switch sections 7 is transformed into the video amplifier 2.At this moment, because quickly-blanking signal FB is a low level, only according to this horizontal-drive signal H
SyncProduce this blanking signal, and no matter the state of this quickly-blanking signal FB.The blanking signal of Chan Shenging outputs to video output 3 as described above, therefore shows incoming video signal on this screen.
Simultaneously, if screen signal is provided, then quickly-blanking signal FB becomes high level, so switch sections 7 is transformed into bumper portion 6, and screen signal provides from this bumper portion 6.At this moment, as shown in Fig. 4 D, blanking control section 8 is according to quickly-blanking signal FB and according to horizontal-drive signal H
SyncProduce this blanking signal.Therefore the blanking signal of Chan Shenging outputs to video output 3 as described above, at the ad-hoc location display screen signal of this screen.
Know that from the narration of front on-screen display circuit according to the present invention is carried Supply following advantage: when screen signal was provided, it was by the corresponding video letter of blanking Number can show the screen signal with predetermined luminance at the ad-hoc location of this screen.
Claims (3)
1. the on-screen display circuit of a video display apparatus comprises:
A microcomputer is used to control screen display;
The screen processing section provides the red, green and blue screen signal under the control of this microcomputer;
Switching device, by the quickly-blanking signal controlling that provides from the screen processing unit to select and to provide one of red, green and blue screen signal and input red, green and blue vision signal;
Video output device is used to amplify red, green and blue screen signal or the red, green and blue vision signal that provides from this switching device, and the output amplifying signal is to the red, green and blue cathode terminal of cathode ray tube; With
The blanking control device, it by the quickly-blanking signal controlling that provides from the isolated synchronizing signal of this vision signal with from the screen processing unit to provide blanking signal to this video output device.
2. according to the on-screen display circuit of claim 1, further comprise buffer device, be used to cushion the red, green and blue screen signal that offers this switching device from the screen processing unit.
3. according to the on-screen display circuit of claim 1, be a horizontal-drive signal wherein from the isolated synchronizing signal of this vision signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KRP95-11321 | 1995-05-09 | ||
| KR1019950011321A KR960043808A (en) | 1995-05-09 | 1995-05-09 | On-Screen Display Circuit of Image Display Equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1139334A true CN1139334A (en) | 1997-01-01 |
Family
ID=19413998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96105122A Pending CN1139334A (en) | 1995-05-09 | 1996-05-08 | On-screen display circuit for video display appliance |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPH08336084A (en) |
| KR (1) | KR960043808A (en) |
| CN (1) | CN1139334A (en) |
| AU (1) | AU5214896A (en) |
| BR (1) | BR9601651A (en) |
| CA (1) | CA2175959A1 (en) |
| DE (1) | DE19618525A1 (en) |
| GB (1) | GB2300780B (en) |
| IT (1) | IT1282970B1 (en) |
| RU (1) | RU2115263C1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017489A (en) * | 1983-07-08 | 1985-01-29 | 船井電機株式会社 | Video signal imposing circuit |
| US5034818A (en) * | 1989-07-10 | 1991-07-23 | Samsung Electronics Co., Ltd. | Priority selector for external signals |
-
1995
- 1995-05-09 KR KR1019950011321A patent/KR960043808A/en not_active Application Discontinuation
-
1996
- 1996-05-07 CA CA002175959A patent/CA2175959A1/en not_active Abandoned
- 1996-05-07 AU AU52148/96A patent/AU5214896A/en not_active Abandoned
- 1996-05-08 IT IT96MI000923A patent/IT1282970B1/en active IP Right Grant
- 1996-05-08 CN CN96105122A patent/CN1139334A/en active Pending
- 1996-05-08 RU RU96109056A patent/RU2115263C1/en active
- 1996-05-08 DE DE19618525A patent/DE19618525A1/en not_active Withdrawn
- 1996-05-09 GB GB9609685A patent/GB2300780B/en not_active Expired - Fee Related
- 1996-05-09 BR BR9601651A patent/BR9601651A/en not_active Application Discontinuation
- 1996-05-09 JP JP8139625A patent/JPH08336084A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR960043808A (en) | 1996-12-23 |
| DE19618525A1 (en) | 1996-11-14 |
| CA2175959A1 (en) | 1996-11-10 |
| ITMI960923A1 (en) | 1997-11-08 |
| GB9609685D0 (en) | 1996-07-10 |
| JPH08336084A (en) | 1996-12-17 |
| RU2115263C1 (en) | 1998-07-10 |
| GB2300780B (en) | 1999-10-27 |
| AU5214896A (en) | 1996-11-21 |
| GB2300780A (en) | 1996-11-13 |
| IT1282970B1 (en) | 1998-04-03 |
| BR9601651A (en) | 1998-03-31 |
| ITMI960923A0 (en) | 1996-05-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |