CN100456340C - Low voltage differential signal direct transmission method and interface - Google Patents
Low voltage differential signal direct transmission method and interface Download PDFInfo
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- CN100456340C CN100456340C CNB2005100907113A CN200510090711A CN100456340C CN 100456340 C CN100456340 C CN 100456340C CN B2005100907113 A CNB2005100907113 A CN B2005100907113A CN 200510090711 A CN200510090711 A CN 200510090711A CN 100456340 C CN100456340 C CN 100456340C
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Abstract
This invention discloses a direct transmission method for low voltage differential signals LVDS and an interface for transmitting signals between plot/ image signal source and a display, which allows LVDS to be output to the display from the source directly and not converted many times for D/A and A/D, the interface includes a signal filter, a panel supply control unit and a panel high voltage control unit and matches with a parameter design unit in the display to decide the time sequence correctly for the panel supply signals, the LVDS signals and backlighted high voltage supply signals to input into the display so as to filter unnecessary turn-on start noises and prolong the life time of display panels.
Description
Technical field
The invention relates to the method and the device of a kind of drawing/image data transmission, refer to that especially a kind of Low Voltage Differential Signal that can directly drawing/image data source be exported directly is sent to the display module end, must not carry out the technology of numeral, analog-converted.
Background technology
Interior arrangement at LCD (LCD), except can seeing the LCD panel module, another printed circuit board promptly is the control panel of LCD, and primary clustering more common in this control panel includes: digital/analog converter (A/D converter), scale controller (Scaler), micro-control unit (MCU), screen display adjustment (OSD), Low Voltage Differential Signal are handled interface IC such as (LVDS).
Between existing LCD (LCD) or plasma display (PDP) and the drawing/image data source, be data could be shown on the display module through data formats conversion for several times.Drawing/image data source at first can change into the image data data analog format and be transferred to display element from digital format, and this end of display (LCD, PDP) is reduced into Low Voltage Differential Signal (Low Voltage Differential Signal, digital format LVDS) with the analog format conversion again.
This conversion of twice does not only have in all senses but also can cause the data distortion, therefore when the user when watching, just be not initial drawing/image data data, the picture that is presented may include noise, picture skew, ripple even problem such as blur.
Extending display identification code (Extended Display IdentificationData because of the traditional panel end, EDID) offer the information of drawing/image source end and inadequate, therefore the represented data content of Low Voltage Differential Signal (LVDS) only comprises red, green, blue (R, G, B) three primary colors, horizontal frequency, vertical scanning frequency and dot frequency etc., and can't provide the extra power supply timing control signal or the control signal of filtering noise again at this end of display module, therefore, if activated with unsuitable power supply sequential at this end of display module, then can cause having on the picture noise and produce, also can therefore shorten the serviceable life of display pannel simultaneously.
Add in order to carry out the proper proportion convergent-divergent to image data in response to different display module panel size, image can correctly be play on panel, so use the IC of scale controller (Scaler), this scale controller is promptly adjusted at screen resolution of being imported or shape size, rewrites into the original pixels matrix of display panel.If when facing comparatively special panel (as 16: 9), general scale controller still can't be adjusted image data, therefore still need additionally provide a complex set of control circuit.
Summary of the invention
Fundamental purpose of the present invention provides a kind of transmitting device between drawing/signal of video signal source and display module, allow Low Voltage Differential Signal (LVDS) directly to export the display module end to by image source end, and the multiple conversions that must not pass through digital-to-analog, analog/digital makes the unlikely distortion of picture and can possess best displaying image quality.
For reaching aforementioned purpose, the direct transmitting device of this Low Voltage Differential Signal of the present invention is to include:
One traffic filter, when the end electric power starting of drawing/image source, but the initial noise signal of filtering;
One panel power control unit, the power supply of control display module end is in correct sequential On/Off;
One backlight high-voltage power supply control module is to be used to control the backlight electric power of display module end in correct sequential On/Off and backlight illumination control (PWM);
One panel parameter storage unit, be to be arranged at this display module inside, be used to store the specification information of this display module, wherein this panel parameter storage unit Low Voltage Differential Signal (LVDS) that is the definition standard and the transmission time sequence of panel power supply signal, LVDS signal and backlight high-voltage power supply signal;
One data bus is to be connected between aforementioned drawing/source, display module and the panel parameter storage unit.
Wherein, during power-on, this panel power supply signal, LVDS signal and backlight high-voltage power supply signal are to export in regular turn; When powered-down, backlight high-voltage power supply signal, LVDS signal and panel power supply signal are to close in regular turn.
Description of drawings
Fig. 1: system block diagrams of the present invention.
Fig. 2: the sequential chart of power supply control of the present invention.
Fig. 3: the present invention controls the pwm signal oscillogram of backlight illumination.
Fig. 4: the part controlled variable in the panel parameter storage unit of the present invention.
Fig. 5: method flow diagram of the present invention.
Symbol description:
(100) drawing/image source
(200) display module
(10) traffic filter
(20) panel power control unit
(30) high voltage control backlight unit
(40) panel parameter storage unit
(50) data bus
Embodiment
See also shown in Figure 1ly, the present invention is a kind of between drawing/image source (100) and display module (200) data transmission method and device between the two.Drawing/image source (100) can be a drawing/image chip (ASIC), a display card (Display card) or other source, and display module (200) then can be the display device of a LCD (LCD), a plasma display (PDP) or other kind.
And the present invention promptly provides a kind of device, permission is from Low Voltage Differential Signal (the Low voltage differential signal in drawing/image source (100), LVDS) directly transfer to display module (200) and must not carry out digital-to-analog repeatedly, the conversion process of analog/digital, wherein, this Low Voltage Differential Signal (LVDS) is to include 18/24/36/48 rgb signal, the level that determines one or two bus and vertical scanning frequency, dot frequency etc., and concrete kenel of the present invention can be configured as a device card, and this device comprises at least:
One traffic filter (Signal Filter) (10), when the power supply one of drawing/image source (100) end is opened, can produce unnecessary initial noise, the effect of this traffic filter (10) promptly is to be used for these noise signals of filtering, to avoid directly being passed to display module (200) end;
One panel power control unit (20) is used to control the power supply of display module (200) end in correct sequential On/Off;
One backlight high-voltage power supply control module (30) is to be used to control the backlight electric power of display module (200) end in correct sequential On/Off and backlight illumination control (PWM);
One panel parameter storage unit (40), it is the specification information that is used to store this display module (200) panel, this panel parameter setup unit (40) can utilize the electronics formula ROM (read-only memory) (EEPROM) of can erasing to constitute and be installed in display module (200) inside, display panel in response to different moneys, the inside information of internal memory also can correspondingly be revised, wherein the interior stored data of this panel parameter storage unit (40) are except that original Low Voltage Differential Signal (LVDS) standard, more increased the sequential control of how controlling power supply time sequence control signal and removing noise, this EEPROM can use can reaching of 128byte capacity;
One data bus (50) is to be connected between aforementioned drawing/source (100), display module (200) and the panel parameter storage unit (40), can utilize a universal serial bus communications protocol (I
2C Bus) implemented.
Below be controlled to be example with the panel of LCD, please cooperate consult shown in Figure 2, sequential control figure for control display module power supply, be to indicate three groups of unlike signals are arranged among the figure, from top to bottom be respectively panel power supply signal, LVDS signal, (backlight) backlight hardboard power supply, three and asynchronous generation.Be the power supply signal of output slab at first, activating display module (200), give display module (200), the multiple power supply of sending hardboard backlight through second time delay behind the Δ 2 again through exporting the LVDS signal again behind the Δ 1 first time delay.And the order direction of closing display module (200) is just opposite with the aforementioned practice, and the meeting of closing at first is the power supply of hardboard backlight, through stopping the signal of LVDS the 3rd time delay behind the Δ 3, at last through the 4th time delay Δ 4 again with the panel power-off.
Via aforesaid sequential control mode, can guarantee that display module (200) holds when machine open/close, all non-stationary noises that produced in initialization procedure can be fully by filtering, and these noise signals will cause display module (200) end to produce unsuitable display action, after avoiding these noise signals, be able to effective prolongation the serviceable life of display module (200) panel.
Fig. 3 is the pwm signal oscillogram that is used for adjusting backlight illumination, pulse width via Δ in the control signal 5, can on display module (200), present different showing luminances, and the present invention must not use an extra pwm signal control circuit to adjust the pulse width of signal, and the output of this pwm signal also is directly to adjust output by this device according to the signal of video signal of input, the characteristic of display module (200).
In panel parameter storage unit (40), except the standard criterion of original LVDS, the present invention has further added the controlled variable of corresponding panel, and those additional parameter are represented as Fig. 4, comprise:
1. the sequential of the power supply of display panel control, LVDS data and hardboard power control signal backlight.
2.LVDS the quantity of rgb signal form (18/24/36/48) and LVDS channel.
3. the ON/OFF of frequency spectrum extension function and proportional control.
4.LVDS the driving energy, signal amplitude control and direct current quasi-position.
5.LVDS the gain of PLL voltage-controlled oscillating.
6.LVDS the PLL work period is controlled.
7.LVDS PLL charge-pump gain control.
8. extending display identification code EDID data.
9. rising or the falling edge via horizontal synchronization, vertical synchronization, unlatching control signal activates LCD/PDP to increase the compatibility of LCD/PDP.
Please refer to shown in Figure 5, be method flow diagram of the present invention, after the initialization operation is finished in drawing/image source (100), be to check the existence that has or not this panel parameter storage unit (40), if have, then read inner storage parameter and judge whether those parameters are correct, if the correct person of parameter, then begin calculating and conversion parameter so that the LVDS device is carried out initial job, determine panel power supply signals, LVDS signal and backlight high-voltage power supply signal three's suitable sequential at last according to those parameters.
Except aforementioned feature, the present invention supports plug to show (Plug ﹠amp simultaneously; Display) function, because the information and the characteristic of all display modules (200) end can automatically be detected and obtain in drawing/image source (100) from this panel parameter setup unit, so image source end is optimal data information can be offered display end immediately.
In sum, the present invention utilizes the practice of default panel parameter, for image source end and display module have been set up a kind of device that can directly transmit the LVDS signal between the two, must be through several D/A, A/D conversion, so the best image quality that can possess former display data, simultaneously, via correct panel power supply signal, LVDS signal and the backlight high-voltage power supply signal stipulated, be to guarantee to show that image quality is not influenced by the noise of electric power starting/when closing.
Claims (8)
1. the direct transmitting device of Low Voltage Differential Signal is to be connected between a drawing/image source and the display module, and this transmitting device includes:
One traffic filter, when the end electric power starting of drawing/image source, but the initial noise signal of filtering;
One panel power control unit, the power supply of control display module end is in correct sequential On/Off;
One backlight high-voltage power supply control module is to be used to control the backlight electric power of display module end in correct sequential On/Off and backlight illumination control;
One panel parameter storage unit, be to be arranged at this display module inside, be used to store the specification information of this display module, wherein this panel parameter storage unit Low Voltage Differential Signal that is the definition standard and the transmission time sequence of panel power supply signal, LVDS signal and backlight high-voltage power supply signal, when power-on, this panel power supply signal, LVDS signal and backlight high-voltage power supply signal are to export in regular turn, when powered-down, backlight high-voltage power supply signal, LVDS signal and panel power supply signal are to close in regular turn;
One data bus is to be connected between aforementioned drawing/image source, display module and the panel parameter storage unit.
2. the direct transmitting device of Low Voltage Differential Signal according to claim 1, this panel parameter storage unit are the electronics formula ROM (read-only memory) of can erasing.
3. the direct transmitting device of Low Voltage Differential Signal according to claim 1 and 2, this data bus are a universal serial bus communications protocol.
4. the direct transmitting device of Low Voltage Differential Signal according to claim 3, this panel parameter storage unit are that definition has: the quantity of LVDS rgb signal form and LVDS channel; LVDS drives energy, signal amplitude control and direct current quasi-position; Extending display identification code EDID data.
5. the direct transmitting device of Low Voltage Differential Signal according to claim 4, this panel parameter storage unit are that definition has: the ON/OFF and the proportional control of frequency spectrum extension function; The gain of LVDS PLL voltage-controlled oscillating; The LVDS PLL work period is controlled; LVDS PLL charge-pump gain control.
6. the direct transmitting device of Low Voltage Differential Signal according to claim 5 when backlight high-voltage power supply is opened, utilizes pwm signal to adjust backlight illumination.
7. a low voltage differential signal direct transmission method is to transmit Low Voltage Differential Signal to a display module by drawing/image source, and this method comprises:
Carry out the initialization operation in drawing/image source;
Detect this display module and have or not a panel parameter storage unit;
If have, then read the storage parameter of panel parameter storage unit inside and judge whether those parameters are correct;
If parameter is correct, calculating and conversion parameter are to carry out initial job to the LVDS device;
According to those parameter decision panel power supply signals, LVDS signal and backlight high-voltage power supply signal three's transmission time sequence, when power-on, this panel power supply signal, LVDS signal and backlight high-voltage power supply signal are to export in regular turn; When powered-down, backlight high-voltage power supply signal, LVDS signal and panel power supply signal are to close in regular turn.
8. low voltage differential signal direct transmission method according to claim 7 when backlight high-voltage power supply is opened, utilizes pwm signal to adjust backlight illumination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100907113A CN100456340C (en) | 2005-08-11 | 2005-08-11 | Low voltage differential signal direct transmission method and interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100907113A CN100456340C (en) | 2005-08-11 | 2005-08-11 | Low voltage differential signal direct transmission method and interface |
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| CN1912963A CN1912963A (en) | 2007-02-14 |
| CN100456340C true CN100456340C (en) | 2009-01-28 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362560C (en) * | 2005-10-10 | 2008-01-16 | 深圳创维－Rgb电子有限公司 | TV set LCD time sequence controlling method during open |
| CN101295472B (en) | 2007-04-24 | 2010-10-06 | 北京京东方光电科技有限公司 | LCD device high dynamic contrast processing equipment and method |
| CN101308630B (en) * | 2007-05-18 | 2011-12-14 | 群康科技(深圳)有限公司 | LCD device |
| CN101393727B (en) | 2007-09-21 | 2011-07-20 | 北京京东方光电科技有限公司 | Highly dynamic contrast processing apparatus and method for LCD device |
| CN102024400B (en) * | 2009-09-22 | 2013-04-03 | 华映视讯（吴江）有限公司 | Display device and backlight control method |
| CN110428792B (en) * | 2019-07-08 | 2021-03-09 | 新华三技术有限公司合肥分公司 | Controller, display screen parameter configuration system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH075727A (en) * | 1993-06-17 | 1995-01-10 | Fuji Photo Film Co Ltd | Method for producing electrophotographic engraving printing plate and device used for it |
| CN1609941A (en) * | 2003-10-21 | 2005-04-27 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and driving method thereof |
| CN1645204A (en) * | 2004-01-23 | 2005-07-27 | 株式会社日立显示器 | Liquid crystal display device |
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2005
- 2005-08-11 CN CNB2005100907113A patent/CN100456340C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH075727A (en) * | 1993-06-17 | 1995-01-10 | Fuji Photo Film Co Ltd | Method for producing electrophotographic engraving printing plate and device used for it |
| CN1609941A (en) * | 2003-10-21 | 2005-04-27 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and driving method thereof |
| CN1645204A (en) * | 2004-01-23 | 2005-07-27 | 株式会社日立显示器 | Liquid crystal display device |
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Granted publication date: 20090128 Termination date: 20100811 |