CN1937706B - Television receiver off-spot removing method and control device - Google Patents
Television receiver off-spot removing method and control device Download PDFInfo
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- CN1937706B CN1937706B CN2006100363655A CN200610036365A CN1937706B CN 1937706 B CN1937706 B CN 1937706B CN 2006100363655 A CN2006100363655 A CN 2006100363655A CN 200610036365 A CN200610036365 A CN 200610036365A CN 1937706 B CN1937706 B CN 1937706B
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Abstract
The invention relates to TV display operation technology, it improves a method of banishing the cut-off light spot of TV remote-controller. It is characterized in that the lower scanning frequency will be upgraded to a higher scanning frequency while accepting power-off order in the normal situation. So the scanning frequency will be enough level at cut off moment, the light spot can be stimulated. With this approach, it is effective to banish TV remote-controller light spot, which protects kinescope and prolongs TV usage period, also preventing light spot damaging viewers' eyesight.
Description
Technical field
The present invention relates to the television set display control technology, or rather, relate to television set off-spot removing method and control device.
Background technology
Use CRT (cathode ray tube) as the television set of display element when the shutdown, especially during remote-control closedown, the picture tube bias magnetic field is closed, but still there is electric field remaining, near the electronics that gathers the negative electrode is accelerated under described remaining effect of electric field, owing to there is not magnetic deflection field, all concentrates and penetrates in fluoroscopic centre, form hot spot, be referred to as " bright spot ".The generation that the height of voltage of electric field is directly connected to bright spot whether, voltage is high more, easy more generation bright spot.And for the picture tube of television set, described voltage is relevant with line frequency, and line frequency is low more, and high pressure is high more; Otherwise line frequency is high more, and high pressure is low more.
Therefore, use the television set of the lower picture tube of line-scanning frequency,, off-spot occurs through regular meeting as using the 15KHz line frequency.The general solution of prior art has two kinds, and the one, on hardware, increase spot killer circuit, discharging by increase negative pressure and/or target stops electron beam to arrive phosphor screen; The 2nd, the time by a line scanning electric field and a bias magnetic field of software control television set are closed, make the two basic identical.But owing to the time delay parameter difference of different picture tubes, therefore operation is gone up and is difficult to bright spot is eliminated fully, is the horizontal line bright line sometimes when consequently shutting down, and is vertical line bright line or center speck sometimes.
Summary of the invention
In order to eliminate the television screen off-spot, do not increase extra hardware simultaneously, television set bright spot software removing method of the present invention and control device have been proposed.
TV remote-control off-spot removing method of the present invention is, when accepting shutdown command, line-scanning frequency lower under the normal operating conditions is promoted to higher line-scanning frequency gradually, in the moment of shutting down the enough height of line-scanning frequency are shut down again, thereby eliminate off-spot.
Preferably, the line-scanning frequency during described operate as normal is 15KHz, and the line-scanning frequency of shutdown moment is 31.5KHz.
Preferably, described remote-control closedown spot removing method is applied to use the television set of 15K line-scanning frequency picture tube.
Preferably, the control of line-scanning frequency being included in the every capable pixel that changes output under the clock permanence condition counts.
According to control method of the present invention, propose a kind of television set off-spot and eliminated control device, it is characterized in that, described device comprises the line-scanning frequency control module, described module is promoted to higher line-scanning frequency with line-scanning frequency lower under the normal operating conditions gradually accepting shutdown command time control NTSC television system NTSC machine, in shutdown moment the enough height of line-scanning frequency is shut down again.
Preferably, described line-scanning frequency control uses cathode-ray tube CRT to realize with the partial function of picture processing chip.
The television set of use this method has effectively been eliminated the problem of off-spot, has protected picture tube, has prolonged the picture tube life-span, avoids the infringement of off-spot to onlooker's eyesight simultaneously.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is that the bright spot of remote-control closedown spot removing method embodiment of the present invention is eliminated process flow diagram.
Fig. 2 is the read clock control module schematic block diagram of the embodiment of the invention.
Embodiment
Known to television picture tube, line-scanning frequency is high more, and high pressure is low more, and line-scanning frequency is low more, and high pressure is high more, therefore can reduce high pressure by improving line-scanning frequency, thereby reach the purpose of eliminating the remote-control closedown bright spot.When line-scanning frequency was enough high, shutdown just can not produce bright spot.Described sufficiently high frequency, its lower limit is different and different according to picture tube and other parameter.In general, line-scanning frequency is the television set of 15KHz frequently during for operate as normal, the bright spot in the time of can well eliminating shutdown when line-scanning frequency rises to 31.5KHz frequently.
A kind of specific embodiments of eliminating bright spot is to use special-purpose CRT to control line-scanning frequency with the partial function of picture processing chip, for example use the PW50 chip, described chip comprises line number mould conversion (HDAC) output control, vertical digital-to-analogue conversion (VDAC) output control and read clock generation module.Wherein read clock is at the clock signal of specific signal pattern output corresponding frequencies, and when input signal pattern one timing, the read clock frequency of output is fixed.The pixel that HDAC output equals every row is counted and be multiply by the clock of each picture element, and the pixel of the corresponding every row of vertical digital-to-analogue conversion (VDAC) output is counted.Like this, when read clock is constant, by adjusting and control HDAC and VDAC output and just can reaching the purpose of controlling line-scanning frequency.
The bright spot of remote-control closedown spot removing method embodiment of the present invention is eliminated process flow diagram as shown in Figure 1.For sake of convenience, following line-scanning frequency abbreviates line frequency as by this area general custom.With the picture tube line frequency is that 15KHz is an example, when television set is in normal show state, then at first controls its line frequency as if the order that receives remote-control closedown and makes it higher slightly than 15KHz; Adjusting HDAC and VDAC output afterwards, line frequency is increased, judge then whether line frequency reaches the frequency of eliminating bright spot, is example here with 31.5KHz; Start normal shutdown programm if line frequency has reached 31.5KHz, process finishes; Then do not get back to the step of adjusting HDAC and VDAC output if reach 31.5KHz, so circulation is till line frequency reaches enough high normal shutdown.
Here, the relevant register value realizes in the chip by changing to adjust HDAC and VDAC output.For the PW50 chip, its line frequency scope that can support be 15KHz to 45KHz, control register 0X48 and 0X49 the 0-5 used in control HDAC output, control register 0X2b and 0x2c the 0-3 used in control VDAC output.
Fig. 2 is the read clock control module schematic block diagram of the embodiment of the invention.The data clock input only just can be used when television set external connection video equipment such as DVD among the figure, the crystal oscillator signal frequency that crystal oscillator produces is 27MHz, and wherein one road crystal oscillator signal is through entering MUX 1 with the input of the data clock after the two divided-frequency after the analog-to-digital conversion module; MUX 1 makes one's options to the two according to control information, and the output signal after the selection obtains 3MHz to the signal between the 30MHz by frequency divider 1, and this signal obtains 100MHz to the signal F0 between the 200MHz through phase-locked loop 1; The crystal oscillator signal of another road 27MHz produces signal F1 by phase-locked loop 2 again behind two divided-frequency, F1 produces when being used for no signal or signal switching and freely shakes, and its value is little with the F0 difference; Signal F1 and F0 import MUX 2 jointly, and MUX 2 is selected the two according to control information, and selected afterwards signal obtains the output of read clock letter by frequency divider 2.Wherein, phase-locked loop 1 and phase-locked loop 2 are to obtain frequency dividing ratio with calculating according to the relevant parameter in the phase-locked loop register excessively.For the PW50 chip, the register that phase-locked loop 1 and phase-locked loop 2 use is 0X50-0X5E.The calculating of frequency dividing ratio relates to parameters such as M, N, R, O, wherein, is respectively for the register of phase-locked loop 1 parameter correspondence: corresponding 0X54 of parameter M and 0X56 the 7th; Corresponding 0X55 of parameter N and 0X56 the 6th, and M=N; The 0th ~ 2 of the corresponding 0X56 of parameter O; The 0th ~ 4 of the corresponding 0X57 of parameters R.Register for phase-locked loop pll O parameter correspondence is respectively: corresponding 0X5C of parameter M and 0X5E the 7th; Corresponding 0X5D of parameter N and 0X5E the 6th, and M=N; The 0th ~ 2 of the corresponding 0X5E of parameter O; The 0th ~ 4 of the corresponding 0X5F of parameters R.Last frequency dividing ratio D computing formula is:
In actual the use, the selection of parameter M, N, R, O is the process of a reverse backstepping, selects according to analog-to-digital conversion input, line frequency etc.For example, for 1080i analog-to-digital conversion input, line frequency 33.75KHz, output 31.5KHz, calculated data clock at first then, because can only be according to 1440 sampling, so data clock=1440 * 33.75=48.6MHz; The read clock of output then is: 1440 * 31.5KHZ=45.36MHZ.
Because phase-locked loop 1 input range is in 3 ~ 30MHZ scope, thus the divider ratio of frequency divider 1 can to join be 2 or 3, as be made into 3, then phase-locked loop 1 is input as 48.6/2=16.2MHz; And the output of phase-locked loop 1 is between 100 ~ 200MHz, thus the divider ratio of frequency divider 2 can to join be 3, then frequency divider 1 is input as 45.36 * 3=136.08Hz.Register to M, the N of phase-locked loop 1, O, R parameter correspondence is configured at last, because
Therefore calculate at last: O=0, R=4, M=N=41 are more satisfactory combinations.Also need M, N, the O to phase-locked loop 2, the register of R parameter correspondence to be configured, the parameter of at this moment known frequency divider 2 determines that it is constant that it is input as 13.5MHz, by following formula:
Calculate at last: 0=1, R=4, M=N=100 are more satisfactory combinations.The computational process of other frequency numerical value similarly.
Claims (5)
1. TV remote-control off-spot removing method, it is characterized in that, when accepting shutdown command, with vertical digital-to-analogue conversion (VDAC) line-scanning frequency under the normal operating conditions is promoted by adjusting line number mould conversion (HDAC), when line-scanning frequency has reached enough high, shut down again; Line-scanning frequency during described operate as normal is 15KHz, and the line-scanning frequency of shutdown moment is 31.5KHz.
2. method according to claim 1 is characterized in that described remote-control closedown spot removing method is applied to use the television set of 15K line-scanning frequency picture tube.
3. method according to claim 1 is characterized in that, the control of line-scanning frequency is included in the every capable pixel that changes output under the clock permanence condition counts, and every capable picture element number reduces, and then line-scanning frequency promotes.
4. a TV remote-control off-spot is eliminated control device, it is characterized in that, described device comprises the line-scanning frequency control module, described module gradually is promoted to higher line-scanning frequency with vertical digital-to-analogue conversion (VDAC) control television set with line-scanning frequency lower under the normal operating conditions by adjusting line number mould conversion (HDAC) when accepting shutdown command, moment is shut down the enough height of line-scanning frequency again shutting down; Line-scanning frequency during described operate as normal is 15KHz, and the line-scanning frequency of shutdown moment is 31.5KHz.
5. control device according to claim 4 is characterized in that, described line-scanning frequency control uses CRT to realize with the partial function of picture processing chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100363655A CN1937706B (en) | 2006-06-30 | 2006-06-30 | Television receiver off-spot removing method and control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100363655A CN1937706B (en) | 2006-06-30 | 2006-06-30 | Television receiver off-spot removing method and control device |
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| CN1937706A CN1937706A (en) | 2007-03-28 |
| CN1937706B true CN1937706B (en) | 2011-05-11 |
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| CN2006100363655A Expired - Fee Related CN1937706B (en) | 2006-06-30 | 2006-06-30 | Television receiver off-spot removing method and control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110233618A (en) * | 2019-07-17 | 2019-09-13 | 深圳市富满电子集团股份有限公司 | Phase-locked loop circuit and frequency adjustment method based on LED display chip |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4891608A (en) * | 1987-07-13 | 1990-01-02 | Hitachi, Ltd. | #6 Control circuit for horizontal oscillator |
| CN1199303A (en) * | 1997-04-25 | 1998-11-18 | 松下电器产业株式会社 | Double-speed image signal display method and display unit, and TV set |
| CN2682745Y (en) * | 2003-12-26 | 2005-03-02 | 深圳创维－Rgb电子有限公司 | Television set with bright spot eliminating circuit as turning off |
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- 2006-06-30 CN CN2006100363655A patent/CN1937706B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4891608A (en) * | 1987-07-13 | 1990-01-02 | Hitachi, Ltd. | #6 Control circuit for horizontal oscillator |
| CN1199303A (en) * | 1997-04-25 | 1998-11-18 | 松下电器产业株式会社 | Double-speed image signal display method and display unit, and TV set |
| CN2682745Y (en) * | 2003-12-26 | 2005-03-02 | 深圳创维－Rgb电子有限公司 | Television set with bright spot eliminating circuit as turning off |
Non-Patent Citations (2)
| Title |
|---|
| US 4891608 A,全文. |
| 同上. |
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