CN100495522C - Driving apparatus and method for LCD - Google Patents
Driving apparatus and method for LCD Download PDFInfo
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- CN100495522C CN100495522C CNB2006101625320A CN200610162532A CN100495522C CN 100495522 C CN100495522 C CN 100495522C CN B2006101625320 A CNB2006101625320 A CN B2006101625320A CN 200610162532 A CN200610162532 A CN 200610162532A CN 100495522 C CN100495522 C CN 100495522C
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Abstract
This invention relates to one LCD drive device circuit and its method, which uses time sequence controller to receive low voltage difference signals from image converter, wherein ,the signals comprises level simultaneous signals; using controller to modulate and to output multiple frequency lamp operation as control signals to converter chip to change converter control chip operation frequency on LCD panel.
Description
Technical field
The invention relates to a kind of LCD Technology field, refer to a kind of driving circuit and driving method of LCD especially.
Background technology
In recent years, liquid crystal TV set is regarded as the rising star of consumption electronic products.Yet during the driving circuit of general research staff on design LCD TV panel, the experience of often prolonging with the driving circuit on the panel of LCD designs, and so will produce many problems.
The explanation of the driving circuit of relevant known liquid crystal TV set please be in the lump with reference to Fig. 1 and Fig. 2, and wherein Fig. 1 shows the synoptic diagram of the panel module of known liquid crystal TV set, and Fig. 2 shows the synoptic diagram of the sub-pixel (Sub_Pixe1) of display panel.
In Fig. 1, panel module comprises control panel 11, front-end source polar circuit plate 121, rear end source circuit plate 122, grid circuit plate 13, reaches display panel 14, and wherein group is provided with time schedule controller (Timing Controller is called for short TCON) 111 on the control panel 11.Be provided with a plurality of source electrode driver elements 151,152 between display panel 14 and front-end source polar circuit plate 121 and the rear end source circuit plate 122, group is provided with a source driving chip (also can be referred to as data chip) (not icon) in each source drive unit 151,152.Be provided with a plurality of drive element of the grid 161,162 between display panel 14 and the grid circuit plate 13, group is provided with a grid drive chip (also can be referred to as to scan chip) (not icon) in each drive element of the grid 161,162.
So that the widescreen XGA (Extended Graphics Array)+(WXGA+) display panel of the liquid crystal TV set of (1366X768) resolution is an example, under the system signal standard that National Television System Committee (NTSC) is formulated, 768 grid cablings must be in the time of 1 picture (about 16.67ms) transmit enabling signal in regular turn and open thin film transistor (TFT).In other words, the assigned only about 21.7us of time (46.08KHz) of each bar grid cabling.That is to say, in this of short duration time, add up to 1366X3 thin film transistor (TFT) and must finish the On/Off of gate terminal (Turn On/Turn Off) operation, and source electrode-drain electrode end video data writes liquid crystal capacitance.In addition, do not consider signal delay on the steady cycle that disappears (Blanking Period) and the transmission line beyond the viewing area blink of aforementioned indication.
By above explanation as can be known, each bar grid cabling is opened very of short duration and frequency of the time close again in experience and is exceedingly fast.Open (opening) or close at that moment when the grid cabling, the variation of voltage is the fiercest, approximately has 30～40 volts, again via the stray capacitance of Cgd, and then has influence on the voltage of show electrode.
The generation of above-mentioned Cgd, the same with general complementary metal oxide semiconductor (CMOS) (CMOS) circuit, be to be positioned at the gate terminal of metal-oxide semiconductor (MOS) (MOS) and the stray capacitance of drain electrode end.Because gate terminal is to receive the cabling of source driving chip output on display panels, therefore, just can have influence on the voltage on the show electrode in case the voltage on source driving chip output cabling has had fierce variation.
For example, when the grid cabling of image frame N is opened, can produce a feedthrough that makes progress (FeedThrough) voltage on show electrode.But this moment is because the cause that the grid cabling is opened, source driving chip can begin charging to show electrode, even if therefore to (because influence of feed-trough voltage), source driving chip can not be charged to show electrode correct voltage to voltage at the beginning, influences just not too large.
But, if when the grid cabling is closed, because source driving chip no longer charges to show electrode, voltage drop when so grid drive chip is closed (30～40 volts), just can be on show electrode via the feedthrough of Cgd stray capacitance, cause show electrode voltage that the voltage drop of a feedthrough is arranged, and have influence on the correctness that GTG shows, make the picture GTG uncontinuity that human eye is experienced.Therefore, the error of the control of clock and signal must be paid special attention to when the design driven circuit.
The main design problem that present LCD TV device panel is run into is display frame and has ripples line generating noise.When LCD TV device panel is assembled the converter (Inverter) of liquid crystal television system end, the ripples line noise of horizontal direction appears in the display frame meeting, be because of the frequency of the fluorescent tube operating frequency of converter and horizontal-drive signal (Hsync) each other mutually asynchronous and mutual interference mutually cause, and and then to influence the instantaneous time of each bar grid cabling distribution inconsistent and cause the faint variation of GTG brightness visually.
Present solution is: 1. with the fluorescent tube operating frequency of converter as far as possible away from the frequency of horizontal-drive signal; Or 2. with the fluorescent tube operating frequency of converter and the frequency forced synchronism of horizontal-drive signal, to avoid interfering with each other.
For the 1st kind of solution and since both frequencies away from be limited in scope and the television system end can switch the frequency of horizontal-drive signal, produce so still have faint ripples line noise.That is in order to keep the current stability of cold cathode fluorescent lamp (CCFL), the many employings of converter are at present decided the electric current notion and are designed back level output circuit, so the fluorescent tube operational frequency range will be subject to the parameters such as feedback compensation value on the circuit.In addition, National Television System Committee and line-by-line inversion (PAL, Phase AlterationLine) specification of signals also can switch mutually, makes the frequency variation of horizontal-drive signal, and then the chance disturbed of the fluorescent tube operating frequency of increase and converter.
For the 2nd kind of solution, must use high complex programmable logic element (CPLD) to make the fluorescent tube operating frequency of converter and the frequency forced synchronism of horizontal-drive signal, this kind solution not only makes cost improve, and still potential clock within several pictures with countless problem.
Summary of the invention
The objective of the invention is to be to provide a kind of circuit and method thereof that liquid crystal panel produces ripples line noise that reduce, in order to do the interference of frequency that can effectively reduce converter and horizontal-drive signal frequency, to alleviate the problem that liquid crystal panel produces ripples line noise.
Another object of the present invention is to be to provide a kind of circuit and method thereof that liquid crystal panel produces ripples line noise that reduce, and in order to do the frequency of converter that can be by changing liquid crystal panel, makes the frequency of converter of liquid crystal panel become the on-fixed value.
According to one aspect of the present invention, provide a kind of circuit that liquid crystal panel produces ripples line noise that reduces.This circuit comprises image converter, time schedule controller, reaches the converter control chip.Above-mentioned image converter is in order to provide a plurality of Low Voltage Differential Signals.Time schedule controller and image converter electrically connect, and receive these Low Voltage Differential Signals, and provide a plurality of different fluorescent tube operating frequency control signals respectively according to horizontal-drive signal included in these Low Voltage Differential Signals.Converter control chip and time schedule controller electrically connect, after feasible these fluorescent tube operating frequency control signals of reception, be to carry out modulation treatment to it, and level output circuit after exporting to, wherein these a plurality of different fluorescent tube operating frequency control signals are that minimum reference is carried out loop cycle with each display frame, and equalization ground every the display variation of predetermined number once.
According to another aspect of the present invention, provide a kind of method that liquid crystal panel produces ripples line noise that reduces, comprise the steps: that (A) provides a plurality of different fluorescent tube operating frequency control signals according to horizontal-drive signal, and transmit these fluorescent tube operating frequencies respectively and control signal to the converter control chip; And (B) after the converter control chip receives these fluorescent tube operating frequency control signals, be to carry out modulation treatment to it, and level output circuit after exporting to, wherein these a plurality of different fluorescent tube operating frequency control signals are that minimum reference is carried out loop cycle with each display frame, and equalization ground every the display variation of predetermined number once.
According to another aspect of the present invention, provide a kind of liquid crystal indicator, include liquid crystal panel, driving circuit, image converter, time schedule controller, reach the converter control chip.Wherein, liquid crystal panel has upper substrate, infrabasal plate, reaches the liquid crystal layer between this upper substrate and infrabasal plate; Driving circuit has source drive unit, drive element of the grid, and source drive unit and gate-drive unit all electrically connect liquid crystal panel; Image converter is in order to provide a plurality of Low Voltage Differential Signals; Time schedule controller is to electrically connect with image converter, and receives Low Voltage Differential Signal, and provides a plurality of different fluorescent tube operating frequency control signals respectively according to horizontal-drive signal included in the Low Voltage Differential Signal; The converter control chip, be to electrically connect with time schedule controller, after making that the converter control chip receives fluorescent tube operating frequency control signal, be to carry out modulation treatment to it, and level output circuit after exporting to, wherein these a plurality of different fluorescent tube operating frequency control signals are that minimum reference is carried out loop cycle with each display frame, and equalization ground every the display variation of predetermined number once.
These fluorescent tube operating frequency control signals comprise fluorescent tube operating frequency control signal, and the fluorescent tube operating frequency control signal of the 3rd frequency of fluorescent tube operating frequency control signal, the second frequency of first frequency, and time schedule controller provides the fluorescent tube operating frequency control signal of this first frequency when first display frame, time schedule controller provides the fluorescent tube operating frequency control signal of this second frequency when second display frame, time schedule controller provides the fluorescent tube operating frequency control signal of the 3rd frequency when the 3rd display frame.
Above-mentioned time schedule controller provides these fluorescent tube operating frequencies to control signal to the converter control chip with the frequency control cycle, the frequency control cycle comprises a plurality of circulations, in each circulation, the order difference of these fluorescent tube operating frequency control signals that time schedule controller provided.
Time schedule controller comes to electrically connect with the converter control chip by many cablings, and each cabling transmits the fluorescent tube operating frequency control signal of different frequency respectively.
Description of drawings
Fig. 1 is the synoptic diagram of the panel module of known liquid crystal TV set.
Fig. 2 is the synoptic diagram of the sub-pixel (Sub_Pixel) of display panel.
Fig. 3 A is the liquid crystal panel stereographic map of preferred embodiment of the present invention.
Fig. 3 B is the circuit block diagram of the liquid crystal indicator of preferred embodiment of the present invention.
Fig. 4 is preferred embodiment of the present invention sequential chart relevant with time schedule controller in first image frame.
Fig. 5 is preferred embodiment of the present invention sequential chart relevant with time schedule controller in second image frame.
Fig. 6 is preferred embodiment of the present invention sequential chart relevant with time schedule controller in the 3rd image frame.
Fig. 7 is the synoptic diagram of a plurality of operation cycle of preferred embodiment of the present invention.
[main element label declaration]
Rear end source circuit plate 122 grid circuit plates 13
Drive element of the grid 161,162 thin film transistor (TFT)s 21,22
Liquid crystal capacitance 231,232 keeps electric capacity 241,242
323 gate drivers unit 324, source electrode driver unit
Embodiment
Fig. 3 A shows the liquid crystal panel stereographic map of preferred embodiment of the present invention, liquid crystal panel 34 has upper substrate 341, infrabasal plate 342, and liquid crystal layer 343 is between upper substrate 341 and infrabasal plate 342, in addition please in the lump with reference to the circuit block diagram of the liquid crystal indicator of the shown preferred embodiment of the present invention of Fig. 3 B, it comprises circuit system 31, driving circuit 32, and backlight module circuit 33, wherein circuit system 31 also comprises image converter 311 and power management chip 312, driving circuit 32 also comprises time schedule controller (TCON) 321, DC-to-dc converting unit 322, source electrode driver unit 323, with gate driver unit 324, backlight module circuit 33 also comprises converter control chip 331.In present embodiment, source electrode driver unit 323 includes a plurality of source driving chips (not icon), it is to electrically connect liquid crystal panel 34 by source driving chip, gate drivers unit 324 includes a plurality of grid drive chip (not icon), and it is to electrically connect liquid crystal panel 34 by grid drive chip.
Said system circuit 31 is to electrically connect with driving circuit 32 and backlight module circuit 33 respectively, and driving circuit 32 also electrically connects with backlight module circuit 33.In addition, image converter 311 electrically connects with time schedule controller 321, and power management chip 312 electrically connects with DC-to-dc converting unit 322 and converter control chip 331.DC-to-dc converting unit 322 is respectively with time schedule controller 321, source electrode driver unit 323, electrically connect with gate driver unit 324.Time schedule controller 321 and respectively with source electrode driver unit 323, gate drivers unit 324, and converter control chip 331 electrically connect.Note that in present embodiment time schedule controller 321 is to electrically connect with converter control chip 331 by three cablings, in order to do providing three kinds of identification logical design signals to converter control chip 331 for time schedule controller 321.
Above-mentioned power management chip 312 is in order to provide system power supply to driving circuit 32 and backlight module circuit 33.(Low Voltage DifferentialSignal, LVDS) data and Low Voltage Differential Signal clock (LVDS CLK) are to time schedule controller 321 in order to the output LOW voltage differential wave for image converter 311.
In addition, after time schedule controller 321 receives these Low Voltage Differential Signal clocks, and by detecting the horizontal-drive signal (HorizontalSynchronize of reduction from these Low Voltage Differential Signal clock compressions, be called for short Hsync) modulate, to provide a plurality of fluorescent tube operating frequencies to control signal to converter control chip 331, make converter control chip 331 after receiving these fluorescent tube operating frequency control signals, can carry out modulation treatment, export back level output circuit then to it.
In present embodiment, these fluorescent tube operating frequency control signals can comprise first frequency F
H(1,0,0), second frequency F
T(0,1,0), and the 3rd frequency F
LThe signal of (0,0,1) just can be reached average variation within the permission opereating specification by the fluorescent tube operating frequency control signal of switching above-mentioned three kinds of different frequencies by this.In other embodiments, time schedule controller 321 also can provide the fluorescent tube operating frequency control signal of more a plurality of different frequencies.Liquid crystal panel with WXGA+ (1366 X 768) resolution is an example, and the scope that converter control chip 331 allows operating frequency is about between the 44KHZ to 52KHz, so first frequency F
HCan be 52KHZ, second frequency F
TCan be 48KHZ, the 3rd frequency F
LCan be 44KHZ.Similar ground, other fluorescent tube operating frequency control signal also can be told the fluorescent tube operating frequency control signal of various different frequencies according to mentioned above principle.
Fig. 4 shows preferred embodiment of the present invention sequential chart relevant with time schedule controller 321 in first image frame (Frame), and relevant its explanation is also please in the lump with reference to Fig. 3.In Fig. 4, GSP (Gate StartPulse) is meant that time schedule controller 321 exports to the scanning start signal of gate drivers unit 324, H_sync is meant that image converter 311 delivers to the horizontal-drive signal of time schedule controller 321, wherein HB (Horizontal Blanking) is meant the interval time of the adjacent two-stroke face video data that these source driving chips in the source electrode driver unit 323 are exported, GOE (Gate Output Enable) is meant that time schedule controller 321 exports to the output mask signal of these grid drive chip in the gate drivers unit 324, two adjacent sweep traces can not start simultaneously to avoid up and down, and Inv_ConF (InverterControl Frequency) is meant that time schedule controller 321 exports the operating frequency control signal of converter control chip 331 to.
In Fig. 4, in first display frame, frame updating frequency (Frame Rate) is V Hz (that is scanning V image frame each second altogether), the frequency of H_Sync and GOE is H Hz (that is each image frame scans H bar grid cabling altogether), and the fluorescent tube operating frequency control signal (Inv_Conf) that time schedule controller 321 exports converter control chip 331 to is first frequency F
H(1,0,0), and time schedule controller 321 produces I pulse (Pulse) altogether within first image frame.
Similar ground, Fig. 5 shows preferred embodiment of the present invention sequential chart relevant with time schedule controller 321 in second image frame, about its explanation, also please in the lump with reference to Fig. 3.Fig. 5 and Fig. 4 are similar, and only, time schedule controller 321 exports the fluorescent tube operating frequency control signal (Inv_Conf) of converter control chip 331 to and changes into second frequency F
T(0,1,0), and this moment, time schedule controller 321 produced J pulse altogether within second image frame.
Fig. 6 shows preferred embodiment of the present invention sequential chart relevant with time schedule controller 321 in the 3rd image frame, and relevant its explanation is also please in the lump with reference to Fig. 3.Fig. 6 and Fig. 5 and Fig. 4 are similar, and only, time schedule controller 321 exports the fluorescent tube operating frequency control signal (Inv_Conf) of converter control chip 331 to and changes into the 3rd frequency F
L(0,0,1), and this moment, time schedule controller 321 produced K pulse altogether within the 3rd image frame.As seen from the above description, the fluorescent tube operating control signal that Fig. 4～Fig. 6 display timing generator controller 321 provides different frequency respectively in three display frames is to converter control chip 331, with the frequency interferences problem of effective solution converter control chip 331 with horizontal-drive signal.In addition, in present embodiment, be with three display frames as a circulation (Cycle), hereat, in first shown display frame of Fig. 4～Fig. 6, second display frame, and the 3rd display frame be first circulation.
Fig. 7 further is presented at the fluorescent tube operating frequency control signal that time schedule controller provided between each circulation, and relevant its explanation please be in the lump with reference to Fig. 3.For example: in first circulation, time schedule controller 321 provides first frequency F earlier in first display frame
HThe fluorescent tube operating frequency control signal to converter control chip 331, in second display frame, provide second frequency F then
TThe fluorescent tube operating frequency control signal to converter control chip 331, in the 3rd display frame, provide the 3rd frequency F more afterwards
LThe fluorescent tube operating frequency control signal to converter control chip 331.
Similar ground, in Fig. 7, when second circulation (the 4th display frame～6th display frame), the fluorescent tube operating frequency control signal that time schedule controller 321 exports converter control chip 331 to increases progressively a cis-position (being second of digital logic signal carry) in regular turn, make that time schedule controller 321 provides second frequency F in the 4th display frame
TThe fluorescent tube operating frequency control signal to converter control chip 331, in the 5th display frame, provide the 3rd frequency F
LThe fluorescent tube operating frequency control signal to converter control chip 331, in the 6th display frame, provide first frequency F
HThe fluorescent tube operating frequency control signal to converter control chip 331.
When the 3rd circulation (the 7th display frame～9th display frame), the fluorescent tube operating frequency control signal that sequential control 321 exports converter control chip 331 to increases progressively a cis-position (being second of digital logic signal carry) in regular turn again, make that sequential control 321 provides the 3rd frequency F in the 7th display frame
LThe fluorescent tube operating frequency control signal to converter control chip 331, in the 8th display frame, provide first frequency F
HThe fluorescent tube operating frequency control signal to converter control chip 331, in the 9th display frame, provide second frequency F
TThe fluorescent tube operating frequency control signal to converter control chip 331.In present embodiment, time schedule controller 321 also can be formed a frequency control cycle according to above-mentioned three circulations, so that the fluorescent tube operating frequency of converter control chip 331 remains on the on-fixed value and changes in proper order in given frequency and time range intercycle ground, and keep the output of cold cathode fluorescent lamp current stabilization.
Certainly, in other embodiments, each the circulation also can comprise more display frames (for example: four display frames), and each frequency control cycle also can comprise that more circulations (for example: four circulations).
In sum, when the frame updating frequency is V Hz, the first frequency F that the fluorescent tube operating frequency of converter control chip 331 will be exported by time schedule controller 321
H, second frequency F
T, and the 3rd frequency F
L(High, Typical Low) control in proper order according to the frequency of V/9.In addition, the fluorescent tube operating frequency of converter control chip 331 with equalization ground in per three display variation once, per nine display frames are the frequency circulation primary then, so the frequency of the fluorescent tube operating frequency of converter control chip 331 and horizontal-drive signal (Hsync) time interfering with each other will greatly reduce.
By above explanation as can be known, preferred embodiment of the present invention detects the horizontal-drive signal of reduction from the Low Voltage Differential Signal compression by time schedule controller, the fluorescent tube operating control signal of time schedule controller and modulation output different frequency is to the converter control chip, fluorescent tube operating frequency with the converter control chip used of change liquid crystal panel, and utilize on the signal transmssion line plug-in resistance and electric capacity to operate mould modular circuit RC value of feedback backlight adjustment simultaneously, make the fluorescent tube operating frequency of converter control chip be the on-fixed value and also can keep the cold cathode fluorescent lamp fluorescent tube in the variation in proper order of given frequency and time range intercycle and decide current stabilization output, reduce liquid crystal panel produces ripples line noise because of converter problem in order to do reaching.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that the claim scope is described certainly, but not only limits to the foregoing description.
Claims (15)
1. one kind is reduced the circuit that liquid crystal panel produces ripples line noise, comprising:
Image converter in order to a plurality of Low Voltage Differential Signals to be provided, comprises horizontal-drive signal in these Low Voltage Differential Signals;
Time schedule controller electrically connects with this image converter, and receives these Low Voltage Differential Signals, and provides a plurality of different fluorescent tube operating frequency control signals respectively according to horizontal-drive signal included in these Low Voltage Differential Signals; And
The converter control chip electrically connects with this time schedule controller, make that this converter control chip receives these fluorescent tube operating frequency control signals after, be to carry out modulation treatment, and export back level output circuit to it,
Wherein these a plurality of different fluorescent tube operating frequency control signals are that minimum reference is carried out loop cycle with each display frame, and equalization ground every the display variation of predetermined number once.
2. circuit according to claim 1, wherein these fluorescent tube operating frequency control signals comprise the fluorescent tube operating frequency control signal of first frequency, the fluorescent tube operating frequency control signal of second frequency, and the fluorescent tube operating frequency control signal of the 3rd frequency, and this time schedule controller provides the fluorescent tube operating frequency control signal of this first frequency when first display frame, this time schedule controller provides the fluorescent tube operating frequency control signal of this second frequency when second display frame, this time schedule controller provides the fluorescent tube operating frequency control signal of the 3rd frequency when the 3rd display frame.
3. circuit according to claim 1, wherein this time schedule controller is to provide these fluorescent tube operating frequencies to control signal to this converter control chip with the frequency control cycle.
4. circuit according to claim 3, wherein this frequency control cycle comprises a plurality of circulations, in each circulation, the order difference of these fluorescent tube operating frequency control signals that this time schedule controller provided.
5. circuit according to claim 4, wherein this time schedule controller provides these fluorescent tube operating frequencies to control signal to this converter control chip in each circulation, and among each circulation, the order of these fluorescent tube operating frequency control signals is different.
6. circuit according to claim 1, wherein this time schedule controller is to electrically connect with this converter control chip by many cablings, and each cabling transmits the fluorescent tube operating frequency control signal of different frequency respectively.
7. one kind is reduced the method that liquid crystal panel produces ripples line noise, comprises the steps:
(A) provide a plurality of different fluorescent tube operating frequency control signals according to horizontal-drive signal, and transmit these fluorescent tube operating frequencies respectively and control signal to the converter control chip, described fluorescent tube operating frequency control signal is that minimum reference is carried out periodic cycle with each display frame, and equalization ground every the display variation of predetermined number once; And
(B) after this converter control chip receives these fluorescent tube operating frequency control signals, be to carry out modulation treatment to it, and export back level output circuit to.
8. method according to claim 7, wherein these fluorescent tube operating frequency control signals comprise fluorescent tube operating frequency control signal, and the fluorescent tube operating frequency control signal of the 3rd frequency of fluorescent tube operating frequency control signal, the second frequency of first frequency, and when first display frame, provide the fluorescent tube operating frequency control signal of this first frequency, the fluorescent tube operating frequency control signal of this second frequency is provided when second display frame, the fluorescent tube operating frequency control signal of the 3rd frequency is provided when the 3rd display frame.
9. method according to claim 7, wherein these fluorescent tube operating frequency control signals are based on the frequency control cycle and are transferred into this converter control chip.
10. method according to claim 9, wherein this frequency control cycle comprises a plurality of circulations, in each circulation, the order difference of these fluorescent tube operating frequency control signals that provided.
11. a liquid crystal indicator comprises:
Liquid crystal panel has upper substrate, infrabasal plate, reaches the liquid crystal layer between this upper substrate and infrabasal plate;
Driving circuit has source drive unit, drive element of the grid, and this source drive unit and this drive element of the grid all electrically connect this LCD TV panel;
Image converter in order to a plurality of Low Voltage Differential Signals to be provided, comprises horizontal-drive signal in these Low Voltage Differential Signals;
Time schedule controller electrically connects with this image converter, and receives these Low Voltage Differential Signals, and provides a plurality of different fluorescent tube operating frequency control signals respectively according to horizontal-drive signal included in these Low Voltage Differential Signals; And
The converter control chip electrically connects with this time schedule controller, make that this converter control chip receives these fluorescent tube operating frequency control signals after, can carry out modulation treatment to it, and export back level output circuit to,
Wherein these a plurality of different fluorescent tube operating frequency control signals are that minimum reference is carried out loop cycle with each display frame, and equalization ground every the display variation of predetermined number once.
12. liquid crystal indicator according to claim 11, wherein these fluorescent tube operating frequency control signals comprise the fluorescent tube operating frequency control signal of first frequency, the fluorescent tube operating frequency control signal of second frequency, and the fluorescent tube operating frequency control signal of the 3rd frequency, and this time schedule controller provides the fluorescent tube operating frequency control signal of this first frequency when first display frame, this time schedule controller provides the fluorescent tube operating frequency control signal of this second frequency when second display frame, this time schedule controller provides the fluorescent tube operating frequency control signal of the 3rd frequency when the 3rd display frame.
13. liquid crystal indicator according to claim 11, wherein this time schedule controller is to provide these fluorescent tube operating frequencies to control signal to this converter control chip with the frequency control cycle.
14. liquid crystal indicator according to claim 13, wherein this frequency control cycle comprises a plurality of circulations, in each circulation, and the order difference of these fluorescent tube operating frequency control signals that this time schedule controller provided.
15. liquid crystal indicator according to claim 11, wherein this time schedule controller is to electrically connect with this converter control chip by many cablings, and each cabling transmits the fluorescent tube operating frequency control signal of different frequency respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101625320A CN100495522C (en) | 2006-11-27 | 2006-11-27 | Driving apparatus and method for LCD |
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|---|---|---|---|
| CNB2006101625320A CN100495522C (en) | 2006-11-27 | 2006-11-27 | Driving apparatus and method for LCD |
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| CN100495522C true CN100495522C (en) | 2009-06-03 |
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| US20120287120A1 (en) * | 2011-05-13 | 2012-11-15 | Chimei Innolux Corporation | Adaptive timing controller and driving method thereof |
| CN102646400B (en) * | 2011-08-15 | 2013-12-18 | 北京京东方光电科技有限公司 | Display driving circuit, driving method and liquid crystal display device |
| CN106952600B (en) * | 2016-01-07 | 2021-04-20 | 奇景光电股份有限公司 | Time schedule controller and signal output method thereof |
| CN113870809B (en) * | 2021-10-19 | 2022-08-16 | 常州欣盛半导体技术股份有限公司 | Pulse frequency modulation time sequence control method, time sequence controller and display device |
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